drivers/power/ab8500_charger.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2012
   3  *
   4  * Charger driver for AB8500
   5  *
   6  * License Terms: GNU General Public License v2
   7  * Author:
   8  *      Johan Palsson <johan.palsson@stericsson.com>
   9  *      Karl Komierowski <karl.komierowski@stericsson.com>
  10  *      Arun R Murthy <arun.murthy@stericsson.com>
  11  */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/delay.h>
  18 #include <linux/notifier.h>
  19 #include <linux/slab.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/power_supply.h>
  22 #include <linux/completion.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/err.h>
  25 #include <linux/workqueue.h>
  26 #include <linux/kobject.h>
  27 #include <linux/of.h>
  28 #include <linux/mfd/core.h>
  29 #include <linux/mfd/abx500/ab8500.h>
  30 #include <linux/mfd/abx500.h>
  31 #include <linux/mfd/abx500/ab8500-bm.h>
  32 #include <linux/mfd/abx500/ab8500-gpadc.h>
  33 #include <linux/mfd/abx500/ux500_chargalg.h>
  34 #include <linux/usb/otg.h>
  35 #include <linux/mutex.h>
  36
  37 /* Charger constants */
  38 #define NO_PW_CONN                      0
  39 #define AC_PW_CONN                      1
  40 #define USB_PW_CONN                     2
  41
  42 #define MAIN_WDOG_ENA                   0x01
  43 #define MAIN_WDOG_KICK                  0x02
  44 #define MAIN_WDOG_DIS                   0x00
  45 #define CHARG_WD_KICK                   0x01
  46 #define MAIN_CH_ENA                     0x01
  47 #define MAIN_CH_NO_OVERSHOOT_ENA_N      0x02
  48 #define USB_CH_ENA                      0x01
  49 #define USB_CHG_NO_OVERSHOOT_ENA_N      0x02
  50 #define MAIN_CH_DET                     0x01
  51 #define MAIN_CH_CV_ON                   0x04
  52 #define USB_CH_CV_ON                    0x08
  53 #define VBUS_DET_DBNC100                0x02
  54 #define VBUS_DET_DBNC1                  0x01
  55 #define OTP_ENABLE_WD                   0x01
  56 #define DROP_COUNT_RESET                0x01
  57 #define USB_CH_DET                      0x01
  58
  59 #define MAIN_CH_INPUT_CURR_SHIFT        4
  60 #define VBUS_IN_CURR_LIM_SHIFT          4
  61 #define AB8540_VBUS_IN_CURR_LIM_SHIFT   2
  62 #define AUTO_VBUS_IN_CURR_LIM_SHIFT     4
  63 #define AB8540_AUTO_VBUS_IN_CURR_MASK   0x3F
  64 #define VBUS_IN_CURR_LIM_RETRY_SET_TIME 30 /* seconds */
  65
  66 #define LED_INDICATOR_PWM_ENA           0x01
  67 #define LED_INDICATOR_PWM_DIS           0x00
  68 #define LED_IND_CUR_5MA                 0x04
  69 #define LED_INDICATOR_PWM_DUTY_252_256  0xBF
  70
  71 /* HW failure constants */
  72 #define MAIN_CH_TH_PROT                 0x02
  73 #define VBUS_CH_NOK                     0x08
  74 #define USB_CH_TH_PROT                  0x02
  75 #define VBUS_OVV_TH                     0x01
  76 #define MAIN_CH_NOK                     0x01
  77 #define VBUS_DET                        0x80
  78
  79 #define MAIN_CH_STATUS2_MAINCHGDROP             0x80
  80 #define MAIN_CH_STATUS2_MAINCHARGERDETDBNC      0x40
  81 #define USB_CH_VBUSDROP                         0x40
  82 #define USB_CH_VBUSDETDBNC                      0x01
  83
  84 /* UsbLineStatus register bit masks */
  85 #define AB8500_USB_LINK_STATUS          0x78
  86 #define AB8505_USB_LINK_STATUS          0xF8
  87 #define AB8500_STD_HOST_SUSP            0x18
  88 #define USB_LINK_STATUS_SHIFT           3
  89
  90 /* Watchdog timeout constant */
  91 #define WD_TIMER                        0x30 /* 4min */
  92 #define WD_KICK_INTERVAL                (60 * HZ)
  93
  94 /* Lowest charger voltage is 3.39V -> 0x4E */
  95 #define LOW_VOLT_REG                    0x4E
  96
  97 /* Step up/down delay in us */
  98 #define STEP_UDELAY                     1000
  99
 100 #define CHARGER_STATUS_POLL 10 /* in ms */
 101
 102 #define CHG_WD_INTERVAL                 (60 * HZ)
 103
 104 #define AB8500_SW_CONTROL_FALLBACK      0x03
 105 /* Wait for enumeration before charing in us */
 106 #define WAIT_ACA_RID_ENUMERATION        (5 * 1000)
 107 /*External charger control*/
 108 #define AB8500_SYS_CHARGER_CONTROL_REG          0x52
 109 #define EXTERNAL_CHARGER_DISABLE_REG_VAL        0x03
 110 #define EXTERNAL_CHARGER_ENABLE_REG_VAL         0x07
 111
 112 /* UsbLineStatus register - usb types */
 113 enum ab8500_charger_link_status {
 114         USB_STAT_NOT_CONFIGURED,
 115         USB_STAT_STD_HOST_NC,
 116         USB_STAT_STD_HOST_C_NS,
 117         USB_STAT_STD_HOST_C_S,
 118         USB_STAT_HOST_CHG_NM,
 119         USB_STAT_HOST_CHG_HS,
 120         USB_STAT_HOST_CHG_HS_CHIRP,
 121         USB_STAT_DEDICATED_CHG,
 122         USB_STAT_ACA_RID_A,
 123         USB_STAT_ACA_RID_B,
 124         USB_STAT_ACA_RID_C_NM,
 125         USB_STAT_ACA_RID_C_HS,
 126         USB_STAT_ACA_RID_C_HS_CHIRP,
 127         USB_STAT_HM_IDGND,
 128         USB_STAT_RESERVED,
 129         USB_STAT_NOT_VALID_LINK,
 130         USB_STAT_PHY_EN,
 131         USB_STAT_SUP_NO_IDGND_VBUS,
 132         USB_STAT_SUP_IDGND_VBUS,
 133         USB_STAT_CHARGER_LINE_1,
 134         USB_STAT_CARKIT_1,
 135         USB_STAT_CARKIT_2,
 136         USB_STAT_ACA_DOCK_CHARGER,
 137 };
 138
 139 enum ab8500_usb_state {
 140         AB8500_BM_USB_STATE_RESET_HS,   /* HighSpeed Reset */
 141         AB8500_BM_USB_STATE_RESET_FS,   /* FullSpeed/LowSpeed Reset */
 142         AB8500_BM_USB_STATE_CONFIGURED,
 143         AB8500_BM_USB_STATE_SUSPEND,
 144         AB8500_BM_USB_STATE_RESUME,
 145         AB8500_BM_USB_STATE_MAX,
 146 };
 147
 148 /* VBUS input current limits supported in AB8500 in mA */
 149 #define USB_CH_IP_CUR_LVL_0P05          50
 150 #define USB_CH_IP_CUR_LVL_0P09          98
 151 #define USB_CH_IP_CUR_LVL_0P19          193
 152 #define USB_CH_IP_CUR_LVL_0P29          290
 153 #define USB_CH_IP_CUR_LVL_0P38          380
 154 #define USB_CH_IP_CUR_LVL_0P45          450
 155 #define USB_CH_IP_CUR_LVL_0P5           500
 156 #define USB_CH_IP_CUR_LVL_0P6           600
 157 #define USB_CH_IP_CUR_LVL_0P7           700
 158 #define USB_CH_IP_CUR_LVL_0P8           800
 159 #define USB_CH_IP_CUR_LVL_0P9           900
 160 #define USB_CH_IP_CUR_LVL_1P0           1000
 161 #define USB_CH_IP_CUR_LVL_1P1           1100
 162 #define USB_CH_IP_CUR_LVL_1P3           1300
 163 #define USB_CH_IP_CUR_LVL_1P4           1400
 164 #define USB_CH_IP_CUR_LVL_1P5           1500
 165
 166 #define VBAT_TRESH_IP_CUR_RED           3800
 167
 168 #define to_ab8500_charger_usb_device_info(x) container_of((x), \
 169         struct ab8500_charger, usb_chg)
 170 #define to_ab8500_charger_ac_device_info(x) container_of((x), \
 171         struct ab8500_charger, ac_chg)
 172
 173 /**
 174  * struct ab8500_charger_interrupts - ab8500 interupts
 175  * @name:       name of the interrupt
 176  * @isr         function pointer to the isr
 177  */
 178 struct ab8500_charger_interrupts {
 179         char *name;
 180         irqreturn_t (*isr)(int irq, void *data);
 181 };
 182
 183 struct ab8500_charger_info {
 184         int charger_connected;
 185         int charger_online;
 186         int charger_voltage;
 187         int cv_active;
 188         bool wd_expired;
 189         int charger_current;
 190 };
 191
 192 struct ab8500_charger_event_flags {
 193         bool mainextchnotok;
 194         bool main_thermal_prot;
 195         bool usb_thermal_prot;
 196         bool vbus_ovv;
 197         bool usbchargernotok;
 198         bool chgwdexp;
 199         bool vbus_collapse;
 200         bool vbus_drop_end;
 201 };
 202
 203 struct ab8500_charger_usb_state {
 204         int usb_current;
 205         int usb_current_tmp;
 206         enum ab8500_usb_state state;
 207         enum ab8500_usb_state state_tmp;
 208         spinlock_t usb_lock;
 209 };
 210
 211 struct ab8500_charger_max_usb_in_curr {
 212         int usb_type_max;
 213         int set_max;
 214         int calculated_max;
 215 };
 216
 217 /**
 218  * struct ab8500_charger - ab8500 Charger device information
 219  * @dev:                Pointer to the structure device
 220  * @vbus_detected:      VBUS detected
 221  * @vbus_detected_start:
 222  *                      VBUS detected during startup
 223  * @ac_conn:            This will be true when the AC charger has been plugged
 224  * @vddadc_en_ac:       Indicate if VDD ADC supply is enabled because AC
 225  *                      charger is enabled
 226  * @vddadc_en_usb:      Indicate if VDD ADC supply is enabled because USB
 227  *                      charger is enabled
 228  * @vbat                Battery voltage
 229  * @old_vbat            Previously measured battery voltage
 230  * @usb_device_is_unrecognised  USB device is unrecognised by the hardware
 231  * @autopower           Indicate if we should have automatic pwron after pwrloss
 232  * @autopower_cfg       platform specific power config support for "pwron after pwrloss"
 233  * @invalid_charger_detect_state State when forcing AB to use invalid charger
 234  * @is_aca_rid:         Incicate if accessory is ACA type
 235  * @current_stepping_sessions:
 236  *                      Counter for current stepping sessions
 237  * @parent:             Pointer to the struct ab8500
 238  * @gpadc:              Pointer to the struct gpadc
 239  * @bm:                 Platform specific battery management information
 240  * @flags:              Structure for information about events triggered
 241  * @usb_state:          Structure for usb stack information
 242  * @max_usb_in_curr:    Max USB charger input current
 243  * @ac_chg:             AC charger power supply
 244  * @usb_chg:            USB charger power supply
 245  * @ac:                 Structure that holds the AC charger properties
 246  * @usb:                Structure that holds the USB charger properties
 247  * @regu:               Pointer to the struct regulator
 248  * @charger_wq:         Work queue for the IRQs and checking HW state
 249  * @usb_ipt_crnt_lock:  Lock to protect VBUS input current setting from mutuals
 250  * @pm_lock:            Lock to prevent system to suspend
 251  * @check_vbat_work     Work for checking vbat threshold to adjust vbus current
 252  * @check_hw_failure_work:      Work for checking HW state
 253  * @check_usbchgnotok_work:     Work for checking USB charger not ok status
 254  * @kick_wd_work:               Work for kicking the charger watchdog in case
 255  *                              of ABB rev 1.* due to the watchog logic bug
 256  * @ac_charger_attached_work:   Work for checking if AC charger is still
 257  *                              connected
 258  * @usb_charger_attached_work:  Work for checking if USB charger is still
 259  *                              connected
 260  * @ac_work:                    Work for checking AC charger connection
 261  * @detect_usb_type_work:       Work for detecting the USB type connected
 262  * @usb_link_status_work:       Work for checking the new USB link status
 263  * @usb_state_changed_work:     Work for checking USB state
 264  * @attach_work:                Work for detecting USB type
 265  * @vbus_drop_end_work:         Work for detecting VBUS drop end
 266  * @check_main_thermal_prot_work:
 267  *                              Work for checking Main thermal status
 268  * @check_usb_thermal_prot_work:
 269  *                              Work for checking USB thermal status
 270  * @charger_attached_mutex:     For controlling the wakelock
 271  */
 272 struct ab8500_charger {
 273         struct device *dev;
 274         bool vbus_detected;
 275         bool vbus_detected_start;
 276         bool ac_conn;
 277         bool vddadc_en_ac;
 278         bool vddadc_en_usb;
 279         int vbat;
 280         int old_vbat;
 281         bool usb_device_is_unrecognised;
 282         bool autopower;
 283         bool autopower_cfg;
 284         int invalid_charger_detect_state;
 285         int is_aca_rid;
 286         atomic_t current_stepping_sessions;
 287         struct ab8500 *parent;
 288         struct ab8500_gpadc *gpadc;
 289         struct abx500_bm_data *bm;
 290         struct ab8500_charger_event_flags flags;
 291         struct ab8500_charger_usb_state usb_state;
 292         struct ab8500_charger_max_usb_in_curr max_usb_in_curr;
 293         struct ux500_charger ac_chg;
 294         struct ux500_charger usb_chg;
 295         struct ab8500_charger_info ac;
 296         struct ab8500_charger_info usb;
 297         struct regulator *regu;
 298         struct workqueue_struct *charger_wq;
 299         struct mutex usb_ipt_crnt_lock;
 300         struct delayed_work check_vbat_work;
 301         struct delayed_work check_hw_failure_work;
 302         struct delayed_work check_usbchgnotok_work;
 303         struct delayed_work kick_wd_work;
 304         struct delayed_work usb_state_changed_work;
 305         struct delayed_work attach_work;
 306         struct delayed_work ac_charger_attached_work;
 307         struct delayed_work usb_charger_attached_work;
 308         struct delayed_work vbus_drop_end_work;
 309         struct work_struct ac_work;
 310         struct work_struct detect_usb_type_work;
 311         struct work_struct usb_link_status_work;
 312         struct work_struct check_main_thermal_prot_work;
 313         struct work_struct check_usb_thermal_prot_work;
 314         struct usb_phy *usb_phy;
 315         struct notifier_block nb;
 316         struct mutex charger_attached_mutex;
 317 };
 318
 319 /* AC properties */
 320 static enum power_supply_property ab8500_charger_ac_props[] = {
 321         POWER_SUPPLY_PROP_HEALTH,
 322         POWER_SUPPLY_PROP_PRESENT,
 323         POWER_SUPPLY_PROP_ONLINE,
 324         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 325         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 326         POWER_SUPPLY_PROP_CURRENT_NOW,
 327 };
 328
 329 /* USB properties */
 330 static enum power_supply_property ab8500_charger_usb_props[] = {
 331         POWER_SUPPLY_PROP_HEALTH,
 332         POWER_SUPPLY_PROP_CURRENT_AVG,
 333         POWER_SUPPLY_PROP_PRESENT,
 334         POWER_SUPPLY_PROP_ONLINE,
 335         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 336         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 337         POWER_SUPPLY_PROP_CURRENT_NOW,
 338 };
 339
 340 /*
 341  * Function for enabling and disabling sw fallback mode
 342  * should always be disabled when no charger is connected.
 343  */
 344 static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
 345                 bool fallback)
 346 {
 347         u8 val;
 348         u8 reg;
 349         u8 bank;
 350         u8 bit;
 351         int ret;
 352
 353         dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
 354
 355         if (is_ab8500(di->parent)) {
 356                 bank = 0x15;
 357                 reg = 0x0;
 358                 bit = 3;
 359         } else {
 360                 bank = AB8500_SYS_CTRL1_BLOCK;
 361                 reg = AB8500_SW_CONTROL_FALLBACK;
 362                 bit = 0;
 363         }
 364
 365         /* read the register containing fallback bit */
 366         ret = abx500_get_register_interruptible(di->dev, bank, reg, &val);
 367         if (ret < 0) {
 368                 dev_err(di->dev, "%d read failed\n", __LINE__);
 369                 return;
 370         }
 371
 372         if (is_ab8500(di->parent)) {
 373                 /* enable the OPT emulation registers */
 374                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
 375                 if (ret) {
 376                         dev_err(di->dev, "%d write failed\n", __LINE__);
 377                         goto disable_otp;
 378                 }
 379         }
 380
 381         if (fallback)
 382                 val |= (1 << bit);
 383         else
 384                 val &= ~(1 << bit);
 385
 386         /* write back the changed fallback bit value to register */
 387         ret = abx500_set_register_interruptible(di->dev, bank, reg, val);
 388         if (ret) {
 389                 dev_err(di->dev, "%d write failed\n", __LINE__);
 390         }
 391
 392 disable_otp:
 393         if (is_ab8500(di->parent)) {
 394                 /* disable the set OTP registers again */
 395                 ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
 396                 if (ret) {
 397                         dev_err(di->dev, "%d write failed\n", __LINE__);
 398                 }
 399         }
 400 }
 401
 402 /**
 403  * ab8500_power_supply_changed - a wrapper with local extentions for
 404  * power_supply_changed
 405  * @di:   pointer to the ab8500_charger structure
 406  * @psy:  pointer to power_supply_that have changed.
 407  *
 408  */
 409 static void ab8500_power_supply_changed(struct ab8500_charger *di,
 410                                         struct power_supply *psy)
 411 {
 412         if (di->autopower_cfg) {
 413                 if (!di->usb.charger_connected &&
 414                     !di->ac.charger_connected &&
 415                     di->autopower) {
 416                         di->autopower = false;
 417                         ab8500_enable_disable_sw_fallback(di, false);
 418                 } else if (!di->autopower &&
 419                            (di->ac.charger_connected ||
 420                             di->usb.charger_connected)) {
 421                         di->autopower = true;
 422                         ab8500_enable_disable_sw_fallback(di, true);
 423                 }
 424         }
 425         power_supply_changed(psy);
 426 }
 427
 428 static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
 429         bool connected)
 430 {
 431         if (connected != di->usb.charger_connected) {
 432                 dev_dbg(di->dev, "USB connected:%i\n", connected);
 433                 di->usb.charger_connected = connected;
 434
 435                 if (!connected)
 436                         di->flags.vbus_drop_end = false;
 437
 438                 sysfs_notify(&di->usb_chg.psy.dev->kobj, NULL, "present");
 439
 440                 if (connected) {
 441                         mutex_lock(&di->charger_attached_mutex);
 442                         mutex_unlock(&di->charger_attached_mutex);
 443
 444                         if (is_ab8500(di->parent))
 445                                 queue_delayed_work(di->charger_wq,
 446                                            &di->usb_charger_attached_work,
 447                                            HZ);
 448                 } else {
 449                         cancel_delayed_work_sync(&di->usb_charger_attached_work);
 450                         mutex_lock(&di->charger_attached_mutex);
 451                         mutex_unlock(&di->charger_attached_mutex);
 452                 }
 453         }
 454 }
 455
 456 /**
 457  * ab8500_charger_get_ac_voltage() - get ac charger voltage
 458  * @di:         pointer to the ab8500_charger structure
 459  *
 460  * Returns ac charger voltage (on success)
 461  */
 462 static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
 463 {
 464         int vch;
 465
 466         /* Only measure voltage if the charger is connected */
 467         if (di->ac.charger_connected) {
 468                 vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
 469                 if (vch < 0)
 470                         dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
 471         } else {
 472                 vch = 0;
 473         }
 474         return vch;
 475 }
 476
 477 /**
 478  * ab8500_charger_ac_cv() - check if the main charger is in CV mode
 479  * @di:         pointer to the ab8500_charger structure
 480  *
 481  * Returns ac charger CV mode (on success) else error code
 482  */
 483 static int ab8500_charger_ac_cv(struct ab8500_charger *di)
 484 {
 485         u8 val;
 486         int ret = 0;
 487
 488         /* Only check CV mode if the charger is online */
 489         if (di->ac.charger_online) {
 490                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 491                         AB8500_CH_STATUS1_REG, &val);
 492                 if (ret < 0) {
 493                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 494                         return 0;
 495                 }
 496
 497                 if (val & MAIN_CH_CV_ON)
 498                         ret = 1;
 499                 else
 500                         ret = 0;
 501         }
 502
 503         return ret;
 504 }
 505
 506 /**
 507  * ab8500_charger_get_vbus_voltage() - get vbus voltage
 508  * @di:         pointer to the ab8500_charger structure
 509  *
 510  * This function returns the vbus voltage.
 511  * Returns vbus voltage (on success)
 512  */
 513 static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
 514 {
 515         int vch;
 516
 517         /* Only measure voltage if the charger is connected */
 518         if (di->usb.charger_connected) {
 519                 vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
 520                 if (vch < 0)
 521                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 522         } else {
 523                 vch = 0;
 524         }
 525         return vch;
 526 }
 527
 528 /**
 529  * ab8500_charger_get_usb_current() - get usb charger current
 530  * @di:         pointer to the ab8500_charger structure
 531  *
 532  * This function returns the usb charger current.
 533  * Returns usb current (on success) and error code on failure
 534  */
 535 static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
 536 {
 537         int ich;
 538
 539         /* Only measure current if the charger is online */
 540         if (di->usb.charger_online) {
 541                 ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
 542                 if (ich < 0)
 543                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 544         } else {
 545                 ich = 0;
 546         }
 547         return ich;
 548 }
 549
 550 /**
 551  * ab8500_charger_get_ac_current() - get ac charger current
 552  * @di:         pointer to the ab8500_charger structure
 553  *
 554  * This function returns the ac charger current.
 555  * Returns ac current (on success) and error code on failure.
 556  */
 557 static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
 558 {
 559         int ich;
 560
 561         /* Only measure current if the charger is online */
 562         if (di->ac.charger_online) {
 563                 ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
 564                 if (ich < 0)
 565                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 566         } else {
 567                 ich = 0;
 568         }
 569         return ich;
 570 }
 571
 572 /**
 573  * ab8500_charger_usb_cv() - check if the usb charger is in CV mode
 574  * @di:         pointer to the ab8500_charger structure
 575  *
 576  * Returns ac charger CV mode (on success) else error code
 577  */
 578 static int ab8500_charger_usb_cv(struct ab8500_charger *di)
 579 {
 580         int ret;
 581         u8 val;
 582
 583         /* Only check CV mode if the charger is online */
 584         if (di->usb.charger_online) {
 585                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 586                         AB8500_CH_USBCH_STAT1_REG, &val);
 587                 if (ret < 0) {
 588                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 589                         return 0;
 590                 }
 591
 592                 if (val & USB_CH_CV_ON)
 593                         ret = 1;
 594                 else
 595                         ret = 0;
 596         } else {
 597                 ret = 0;
 598         }
 599
 600         return ret;
 601 }
 602
 603 /**
 604  * ab8500_charger_detect_chargers() - Detect the connected chargers
 605  * @di:         pointer to the ab8500_charger structure
 606  * @probe:      if probe, don't delay and wait for HW
 607  *
 608  * Returns the type of charger connected.
 609  * For USB it will not mean we can actually charge from it
 610  * but that there is a USB cable connected that we have to
 611  * identify. This is used during startup when we don't get
 612  * interrupts of the charger detection
 613  *
 614  * Returns an integer value, that means,
 615  * NO_PW_CONN  no power supply is connected
 616  * AC_PW_CONN  if the AC power supply is connected
 617  * USB_PW_CONN  if the USB power supply is connected
 618  * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
 619  */
 620 static int ab8500_charger_detect_chargers(struct ab8500_charger *di, bool probe)
 621 {
 622         int result = NO_PW_CONN;
 623         int ret;
 624         u8 val;
 625
 626         /* Check for AC charger */
 627         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 628                 AB8500_CH_STATUS1_REG, &val);
 629         if (ret < 0) {
 630                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 631                 return ret;
 632         }
 633
 634         if (val & MAIN_CH_DET)
 635                 result = AC_PW_CONN;
 636
 637         /* Check for USB charger */
 638
 639         if (!probe) {
 640                 /*
 641                  * AB8500 says VBUS_DET_DBNC1 & VBUS_DET_DBNC100
 642                  * when disconnecting ACA even though no
 643                  * charger was connected. Try waiting a little
 644                  * longer than the 100 ms of VBUS_DET_DBNC100...
 645                  */
 646                 msleep(110);
 647         }
 648         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 649                 AB8500_CH_USBCH_STAT1_REG, &val);
 650         if (ret < 0) {
 651                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 652                 return ret;
 653         }
 654         dev_dbg(di->dev,
 655                 "%s AB8500_CH_USBCH_STAT1_REG %x\n", __func__,
 656                 val);
 657         if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
 658                 result |= USB_PW_CONN;
 659
 660         return result;
 661 }
 662
 663 /**
 664  * ab8500_charger_max_usb_curr() - get the max curr for the USB type
 665  * @di:                 pointer to the ab8500_charger structure
 666  * @link_status:        the identified USB type
 667  *
 668  * Get the maximum current that is allowed to be drawn from the host
 669  * based on the USB type.
 670  * Returns error code in case of failure else 0 on success
 671  */
 672 static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
 673                 enum ab8500_charger_link_status link_status)
 674 {
 675         int ret = 0;
 676
 677         di->usb_device_is_unrecognised = false;
 678
 679         /*
 680          * Platform only supports USB 2.0.
 681          * This means that charging current from USB source
 682          * is maximum 500 mA. Every occurence of USB_STAT_*_HOST_*
 683          * should set USB_CH_IP_CUR_LVL_0P5.
 684          */
 685
 686         switch (link_status) {
 687         case USB_STAT_STD_HOST_NC:
 688         case USB_STAT_STD_HOST_C_NS:
 689         case USB_STAT_STD_HOST_C_S:
 690                 dev_dbg(di->dev, "USB Type - Standard host is "
 691                         "detected through USB driver\n");
 692                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 693                 di->is_aca_rid = 0;
 694                 break;
 695         case USB_STAT_HOST_CHG_HS_CHIRP:
 696                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 697                 di->is_aca_rid = 0;
 698                 break;
 699         case USB_STAT_HOST_CHG_HS:
 700                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 701                 di->is_aca_rid = 0;
 702                 break;
 703         case USB_STAT_ACA_RID_C_HS:
 704                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P9;
 705                 di->is_aca_rid = 0;
 706                 break;
 707         case USB_STAT_ACA_RID_A:
 708                 /*
 709                  * Dedicated charger level minus maximum current accessory
 710                  * can consume (900mA). Closest level is 500mA
 711                  */
 712                 dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
 713                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 714                 di->is_aca_rid = 1;
 715                 break;
 716         case USB_STAT_ACA_RID_B:
 717                 /*
 718                  * Dedicated charger level minus 120mA (20mA for ACA and
 719                  * 100mA for potential accessory). Closest level is 1300mA
 720                  */
 721                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P3;
 722                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 723                                 di->max_usb_in_curr.usb_type_max);
 724                 di->is_aca_rid = 1;
 725                 break;
 726         case USB_STAT_HOST_CHG_NM:
 727                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 728                 di->is_aca_rid = 0;
 729                 break;
 730         case USB_STAT_DEDICATED_CHG:
 731                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
 732                 di->is_aca_rid = 0;
 733                 break;
 734         case USB_STAT_ACA_RID_C_HS_CHIRP:
 735         case USB_STAT_ACA_RID_C_NM:
 736                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_1P5;
 737                 di->is_aca_rid = 1;
 738                 break;
 739         case USB_STAT_NOT_CONFIGURED:
 740                 if (di->vbus_detected) {
 741                         di->usb_device_is_unrecognised = true;
 742                         dev_dbg(di->dev, "USB Type - Legacy charger.\n");
 743                         di->max_usb_in_curr.usb_type_max =
 744                                                 USB_CH_IP_CUR_LVL_1P5;
 745                         break;
 746                 }
 747         case USB_STAT_HM_IDGND:
 748                 dev_err(di->dev, "USB Type - Charging not allowed\n");
 749                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
 750                 ret = -ENXIO;
 751                 break;
 752         case USB_STAT_RESERVED:
 753                 if (is_ab8500(di->parent)) {
 754                         di->flags.vbus_collapse = true;
 755                         dev_err(di->dev, "USB Type - USB_STAT_RESERVED "
 756                                                 "VBUS has collapsed\n");
 757                         ret = -ENXIO;
 758                         break;
 759                 } else {
 760                         dev_dbg(di->dev, "USB Type - Charging not allowed\n");
 761                         di->max_usb_in_curr.usb_type_max =
 762                                                 USB_CH_IP_CUR_LVL_0P05;
 763                         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 764                                 link_status,
 765                                 di->max_usb_in_curr.usb_type_max);
 766                         ret = -ENXIO;
 767                         break;
 768                 }
 769                 break;
 770         case USB_STAT_CARKIT_1:
 771         case USB_STAT_CARKIT_2:
 772         case USB_STAT_ACA_DOCK_CHARGER:
 773         case USB_STAT_CHARGER_LINE_1:
 774                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 775                 dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
 776                                 di->max_usb_in_curr.usb_type_max);
 777                 break;
 778         case USB_STAT_NOT_VALID_LINK:
 779                 dev_err(di->dev, "USB Type invalid - try charging anyway\n");
 780                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
 781                 break;
 782
 783         default:
 784                 dev_err(di->dev, "USB Type - Unknown\n");
 785                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
 786                 ret = -ENXIO;
 787                 break;
 788         };
 789
 790         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
 791         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 792                 link_status, di->max_usb_in_curr.set_max);
 793
 794         return ret;
 795 }
 796
 797 /**
 798  * ab8500_charger_read_usb_type() - read the type of usb connected
 799  * @di:         pointer to the ab8500_charger structure
 800  *
 801  * Detect the type of the plugged USB
 802  * Returns error code in case of failure else 0 on success
 803  */
 804 static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
 805 {
 806         int ret;
 807         u8 val;
 808
 809         ret = abx500_get_register_interruptible(di->dev,
 810                 AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
 811         if (ret < 0) {
 812                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 813                 return ret;
 814         }
 815         if (is_ab8500(di->parent))
 816                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
 817                         AB8500_USB_LINE_STAT_REG, &val);
 818         else
 819                 ret = abx500_get_register_interruptible(di->dev,
 820                         AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 821         if (ret < 0) {
 822                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 823                 return ret;
 824         }
 825
 826         /* get the USB type */
 827         if (is_ab8500(di->parent))
 828                 val = (val & AB8500_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
 829         else
 830                 val = (val & AB8505_USB_LINK_STATUS) >> USB_LINK_STATUS_SHIFT;
 831         ret = ab8500_charger_max_usb_curr(di,
 832                 (enum ab8500_charger_link_status) val);
 833
 834         return ret;
 835 }
 836
 837 /**
 838  * ab8500_charger_detect_usb_type() - get the type of usb connected
 839  * @di:         pointer to the ab8500_charger structure
 840  *
 841  * Detect the type of the plugged USB
 842  * Returns error code in case of failure else 0 on success
 843  */
 844 static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
 845 {
 846         int i, ret;
 847         u8 val;
 848
 849         /*
 850          * On getting the VBUS rising edge detect interrupt there
 851          * is a 250ms delay after which the register UsbLineStatus
 852          * is filled with valid data.
 853          */
 854         for (i = 0; i < 10; i++) {
 855                 msleep(250);
 856                 ret = abx500_get_register_interruptible(di->dev,
 857                         AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
 858                         &val);
 859                 dev_dbg(di->dev, "%s AB8500_IT_SOURCE21_REG %x\n",
 860                         __func__, val);
 861                 if (ret < 0) {
 862                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 863                         return ret;
 864                 }
 865
 866                 if (is_ab8500(di->parent))
 867                         ret = abx500_get_register_interruptible(di->dev,
 868                                 AB8500_USB, AB8500_USB_LINE_STAT_REG, &val);
 869                 else
 870                         ret = abx500_get_register_interruptible(di->dev,
 871                                 AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
 872                 if (ret < 0) {
 873                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 874                         return ret;
 875                 }
 876                 dev_dbg(di->dev, "%s AB8500_USB_LINE_STAT_REG %x\n", __func__,
 877                         val);
 878                 /*
 879                  * Until the IT source register is read the UsbLineStatus
 880                  * register is not updated, hence doing the same
 881                  * Revisit this:
 882                  */
 883
 884                 /* get the USB type */
 885                 if (is_ab8500(di->parent))
 886                         val = (val & AB8500_USB_LINK_STATUS) >>
 887                                                         USB_LINK_STATUS_SHIFT;
 888                 else
 889                         val = (val & AB8505_USB_LINK_STATUS) >>
 890                                                         USB_LINK_STATUS_SHIFT;
 891                 if (val)
 892                         break;
 893         }
 894         ret = ab8500_charger_max_usb_curr(di,
 895                 (enum ab8500_charger_link_status) val);
 896
 897         return ret;
 898 }
 899
 900 /*
 901  * This array maps the raw hex value to charger voltage used by the AB8500
 902  * Values taken from the UM0836
 903  */
 904 static int ab8500_charger_voltage_map[] = {
 905         3500 ,
 906         3525 ,
 907         3550 ,
 908         3575 ,
 909         3600 ,
 910         3625 ,
 911         3650 ,
 912         3675 ,
 913         3700 ,
 914         3725 ,
 915         3750 ,
 916         3775 ,
 917         3800 ,
 918         3825 ,
 919         3850 ,
 920         3875 ,
 921         3900 ,
 922         3925 ,
 923         3950 ,
 924         3975 ,
 925         4000 ,
 926         4025 ,
 927         4050 ,
 928         4060 ,
 929         4070 ,
 930         4080 ,
 931         4090 ,
 932         4100 ,
 933         4110 ,
 934         4120 ,
 935         4130 ,
 936         4140 ,
 937         4150 ,
 938         4160 ,
 939         4170 ,
 940         4180 ,
 941         4190 ,
 942         4200 ,
 943         4210 ,
 944         4220 ,
 945         4230 ,
 946         4240 ,
 947         4250 ,
 948         4260 ,
 949         4270 ,
 950         4280 ,
 951         4290 ,
 952         4300 ,
 953         4310 ,
 954         4320 ,
 955         4330 ,
 956         4340 ,
 957         4350 ,
 958         4360 ,
 959         4370 ,
 960         4380 ,
 961         4390 ,
 962         4400 ,
 963         4410 ,
 964         4420 ,
 965         4430 ,
 966         4440 ,
 967         4450 ,
 968         4460 ,
 969         4470 ,
 970         4480 ,
 971         4490 ,
 972         4500 ,
 973         4510 ,
 974         4520 ,
 975         4530 ,
 976         4540 ,
 977         4550 ,
 978         4560 ,
 979         4570 ,
 980         4580 ,
 981         4590 ,
 982         4600 ,
 983 };
 984
 985 static int ab8500_voltage_to_regval(int voltage)
 986 {
 987         int i;
 988
 989         /* Special case for voltage below 3.5V */
 990         if (voltage < ab8500_charger_voltage_map[0])
 991                 return LOW_VOLT_REG;
 992
 993         for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
 994                 if (voltage < ab8500_charger_voltage_map[i])
 995                         return i - 1;
 996         }
 997
 998         /* If not last element, return error */
 999         i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
1000         if (voltage == ab8500_charger_voltage_map[i])
1001                 return i;
1002         else
1003                 return -1;
1004 }
1005
1006 static int ab8500_current_to_regval(struct ab8500_charger *di, int curr)
1007 {
1008         int i;
1009
1010         if (curr < di->bm->chg_output_curr[0])
1011                 return 0;
1012
1013         for (i = 0; i < di->bm->n_chg_out_curr; i++) {
1014                 if (curr < di->bm->chg_output_curr[i])
1015                         return i - 1;
1016         }
1017
1018         /* If not last element, return error */
1019         i = di->bm->n_chg_out_curr - 1;
1020         if (curr == di->bm->chg_output_curr[i])
1021                 return i;
1022         else
1023                 return -1;
1024 }
1025
1026 static int ab8500_vbus_in_curr_to_regval(struct ab8500_charger *di, int curr)
1027 {
1028         int i;
1029
1030         if (curr < di->bm->chg_input_curr[0])
1031                 return 0;
1032
1033         for (i = 0; i < di->bm->n_chg_in_curr; i++) {
1034                 if (curr < di->bm->chg_input_curr[i])
1035                         return i - 1;
1036         }
1037
1038         /* If not last element, return error */
1039         i = di->bm->n_chg_in_curr - 1;
1040         if (curr == di->bm->chg_input_curr[i])
1041                 return i;
1042         else
1043                 return -1;
1044 }
1045
1046 /**
1047  * ab8500_charger_get_usb_cur() - get usb current
1048  * @di:         pointer to the ab8500_charger structre
1049  *
1050  * The usb stack provides the maximum current that can be drawn from
1051  * the standard usb host. This will be in mA.
1052  * This function converts current in mA to a value that can be written
1053  * to the register. Returns -1 if charging is not allowed
1054  */
1055 static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
1056 {
1057         int ret = 0;
1058         switch (di->usb_state.usb_current) {
1059         case 100:
1060                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P09;
1061                 break;
1062         case 200:
1063                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P19;
1064                 break;
1065         case 300:
1066                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P29;
1067                 break;
1068         case 400:
1069                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P38;
1070                 break;
1071         case 500:
1072                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P5;
1073                 break;
1074         default:
1075                 di->max_usb_in_curr.usb_type_max = USB_CH_IP_CUR_LVL_0P05;
1076                 ret = -EPERM;
1077                 break;
1078         };
1079         di->max_usb_in_curr.set_max = di->max_usb_in_curr.usb_type_max;
1080         return ret;
1081 }
1082
1083 /**
1084  * ab8500_charger_check_continue_stepping() - Check to allow stepping
1085  * @di:         pointer to the ab8500_charger structure
1086  * @reg:        select what charger register to check
1087  *
1088  * Check if current stepping should be allowed to continue.
1089  * Checks if charger source has not collapsed. If it has, further stepping
1090  * is not allowed.
1091  */
1092 static bool ab8500_charger_check_continue_stepping(struct ab8500_charger *di,
1093                                                    int reg)
1094 {
1095         if (reg == AB8500_USBCH_IPT_CRNTLVL_REG)
1096                 return !di->flags.vbus_drop_end;
1097         else
1098                 return true;
1099 }
1100
1101 /**
1102  * ab8500_charger_set_current() - set charger current
1103  * @di:         pointer to the ab8500_charger structure
1104  * @ich:        charger current, in mA
1105  * @reg:        select what charger register to set
1106  *
1107  * Set charger current.
1108  * There is no state machine in the AB to step up/down the charger
1109  * current to avoid dips and spikes on MAIN, VBUS and VBAT when
1110  * charging is started. Instead we need to implement
1111  * this charger current step-up/down here.
1112  * Returns error code in case of failure else 0(on success)
1113  */
1114 static int ab8500_charger_set_current(struct ab8500_charger *di,
1115         int ich, int reg)
1116 {
1117         int ret = 0;
1118         int curr_index, prev_curr_index, shift_value, i;
1119         u8 reg_value;
1120         u32 step_udelay;
1121         bool no_stepping = false;
1122
1123         atomic_inc(&di->current_stepping_sessions);
1124
1125         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1126                 reg, &reg_value);
1127         if (ret < 0) {
1128                 dev_err(di->dev, "%s read failed\n", __func__);
1129                 goto exit_set_current;
1130         }
1131
1132         switch (reg) {
1133         case AB8500_MCH_IPT_CURLVL_REG:
1134                 shift_value = MAIN_CH_INPUT_CURR_SHIFT;
1135                 prev_curr_index = (reg_value >> shift_value);
1136                 curr_index = ab8500_current_to_regval(di, ich);
1137                 step_udelay = STEP_UDELAY;
1138                 if (!di->ac.charger_connected)
1139                         no_stepping = true;
1140                 break;
1141         case AB8500_USBCH_IPT_CRNTLVL_REG:
1142                 if (is_ab8540(di->parent))
1143                         shift_value = AB8540_VBUS_IN_CURR_LIM_SHIFT;
1144                 else
1145                         shift_value = VBUS_IN_CURR_LIM_SHIFT;
1146                 prev_curr_index = (reg_value >> shift_value);
1147                 curr_index = ab8500_vbus_in_curr_to_regval(di, ich);
1148                 step_udelay = STEP_UDELAY * 100;
1149
1150                 if (!di->usb.charger_connected)
1151                         no_stepping = true;
1152                 break;
1153         case AB8500_CH_OPT_CRNTLVL_REG:
1154                 shift_value = 0;
1155                 prev_curr_index = (reg_value >> shift_value);
1156                 curr_index = ab8500_current_to_regval(di, ich);
1157                 step_udelay = STEP_UDELAY;
1158                 if (curr_index && (curr_index - prev_curr_index) > 1)
1159                         step_udelay *= 100;
1160
1161                 if (!di->usb.charger_connected && !di->ac.charger_connected)
1162                         no_stepping = true;
1163
1164                 break;
1165         default:
1166                 dev_err(di->dev, "%s current register not valid\n", __func__);
1167                 ret = -ENXIO;
1168                 goto exit_set_current;
1169         }
1170
1171         if (curr_index < 0) {
1172                 dev_err(di->dev, "requested current limit out-of-range\n");
1173                 ret = -ENXIO;
1174                 goto exit_set_current;
1175         }
1176
1177         /* only update current if it's been changed */
1178         if (prev_curr_index == curr_index) {
1179                 dev_dbg(di->dev, "%s current not changed for reg: 0x%02x\n",
1180                         __func__, reg);
1181                 ret = 0;
1182                 goto exit_set_current;
1183         }
1184
1185         dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
1186                 __func__, ich, reg);
1187
1188         if (no_stepping) {
1189                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1190                                         reg, (u8)curr_index << shift_value);
1191                 if (ret)
1192                         dev_err(di->dev, "%s write failed\n", __func__);
1193         } else if (prev_curr_index > curr_index) {
1194                 for (i = prev_curr_index - 1; i >= curr_index; i--) {
1195                         dev_dbg(di->dev, "curr change_1 to: %x for 0x%02x\n",
1196                                 (u8) i << shift_value, reg);
1197                         ret = abx500_set_register_interruptible(di->dev,
1198                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1199                         if (ret) {
1200                                 dev_err(di->dev, "%s write failed\n", __func__);
1201                                 goto exit_set_current;
1202                         }
1203                         if (i != curr_index)
1204                                 usleep_range(step_udelay, step_udelay * 2);
1205                 }
1206         } else {
1207                 bool allow = true;
1208                 for (i = prev_curr_index + 1; i <= curr_index && allow; i++) {
1209                         dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
1210                                 (u8)i << shift_value, reg);
1211                         ret = abx500_set_register_interruptible(di->dev,
1212                                 AB8500_CHARGER, reg, (u8)i << shift_value);
1213                         if (ret) {
1214                                 dev_err(di->dev, "%s write failed\n", __func__);
1215                                 goto exit_set_current;
1216                         }
1217                         if (i != curr_index)
1218                                 usleep_range(step_udelay, step_udelay * 2);
1219
1220                         allow = ab8500_charger_check_continue_stepping(di, reg);
1221                 }
1222         }
1223
1224 exit_set_current:
1225         atomic_dec(&di->current_stepping_sessions);
1226
1227         return ret;
1228 }
1229
1230 /**
1231  * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
1232  * @di:         pointer to the ab8500_charger structure
1233  * @ich_in:     charger input current limit
1234  *
1235  * Sets the current that can be drawn from the USB host
1236  * Returns error code in case of failure else 0(on success)
1237  */
1238 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
1239                 int ich_in)
1240 {
1241         int min_value;
1242         int ret;
1243
1244         /* We should always use to lowest current limit */
1245         min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
1246         if (di->max_usb_in_curr.set_max > 0)
1247                 min_value = min(di->max_usb_in_curr.set_max, min_value);
1248
1249         if (di->usb_state.usb_current >= 0)
1250                 min_value = min(di->usb_state.usb_current, min_value);
1251
1252         switch (min_value) {
1253         case 100:
1254                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1255                         min_value = USB_CH_IP_CUR_LVL_0P05;
1256                 break;
1257         case 500:
1258                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1259                         min_value = USB_CH_IP_CUR_LVL_0P45;
1260                 break;
1261         default:
1262                 break;
1263         }
1264
1265         dev_info(di->dev, "VBUS input current limit set to %d mA\n", min_value);
1266
1267         mutex_lock(&di->usb_ipt_crnt_lock);
1268         ret = ab8500_charger_set_current(di, min_value,
1269                 AB8500_USBCH_IPT_CRNTLVL_REG);
1270         mutex_unlock(&di->usb_ipt_crnt_lock);
1271
1272         return ret;
1273 }
1274
1275 /**
1276  * ab8500_charger_set_main_in_curr() - set main charger input current
1277  * @di:         pointer to the ab8500_charger structure
1278  * @ich_in:     input charger current, in mA
1279  *
1280  * Set main charger input current.
1281  * Returns error code in case of failure else 0(on success)
1282  */
1283 static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
1284         int ich_in)
1285 {
1286         return ab8500_charger_set_current(di, ich_in,
1287                 AB8500_MCH_IPT_CURLVL_REG);
1288 }
1289
1290 /**
1291  * ab8500_charger_set_output_curr() - set charger output current
1292  * @di:         pointer to the ab8500_charger structure
1293  * @ich_out:    output charger current, in mA
1294  *
1295  * Set charger output current.
1296  * Returns error code in case of failure else 0(on success)
1297  */
1298 static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
1299         int ich_out)
1300 {
1301         return ab8500_charger_set_current(di, ich_out,
1302                 AB8500_CH_OPT_CRNTLVL_REG);
1303 }
1304
1305 /**
1306  * ab8500_charger_led_en() - turn on/off chargign led
1307  * @di:         pointer to the ab8500_charger structure
1308  * @on:         flag to turn on/off the chargign led
1309  *
1310  * Power ON/OFF charging LED indication
1311  * Returns error code in case of failure else 0(on success)
1312  */
1313 static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
1314 {
1315         int ret;
1316
1317         if (on) {
1318                 /* Power ON charging LED indicator, set LED current to 5mA */
1319                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1320                         AB8500_LED_INDICATOR_PWM_CTRL,
1321                         (LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
1322                 if (ret) {
1323                         dev_err(di->dev, "Power ON LED failed\n");
1324                         return ret;
1325                 }
1326                 /* LED indicator PWM duty cycle 252/256 */
1327                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1328                         AB8500_LED_INDICATOR_PWM_DUTY,
1329                         LED_INDICATOR_PWM_DUTY_252_256);
1330                 if (ret) {
1331                         dev_err(di->dev, "Set LED PWM duty cycle failed\n");
1332                         return ret;
1333                 }
1334         } else {
1335                 /* Power off charging LED indicator */
1336                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1337                         AB8500_LED_INDICATOR_PWM_CTRL,
1338                         LED_INDICATOR_PWM_DIS);
1339                 if (ret) {
1340                         dev_err(di->dev, "Power-off LED failed\n");
1341                         return ret;
1342                 }
1343         }
1344
1345         return ret;
1346 }
1347
1348 /**
1349  * ab8500_charger_ac_en() - enable or disable ac charging
1350  * @di:         pointer to the ab8500_charger structure
1351  * @enable:     enable/disable flag
1352  * @vset:       charging voltage
1353  * @iset:       charging current
1354  *
1355  * Enable/Disable AC/Mains charging and turns on/off the charging led
1356  * respectively.
1357  **/
1358 static int ab8500_charger_ac_en(struct ux500_charger *charger,
1359         int enable, int vset, int iset)
1360 {
1361         int ret;
1362         int volt_index;
1363         int curr_index;
1364         int input_curr_index;
1365         u8 overshoot = 0;
1366
1367         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1368
1369         if (enable) {
1370                 /* Check if AC is connected */
1371                 if (!di->ac.charger_connected) {
1372                         dev_err(di->dev, "AC charger not connected\n");
1373                         return -ENXIO;
1374                 }
1375
1376                 /* Enable AC charging */
1377                 dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
1378
1379                 /*
1380                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1381                  * will be triggered everytime we enable the VDD ADC supply.
1382                  * This will turn off charging for a short while.
1383                  * It can be avoided by having the supply on when
1384                  * there is a charger enabled. Normally the VDD ADC supply
1385                  * is enabled everytime a GPADC conversion is triggered. We will
1386                  * force it to be enabled from this driver to have
1387                  * the GPADC module independant of the AB8500 chargers
1388                  */
1389                 if (!di->vddadc_en_ac) {
1390                         regulator_enable(di->regu);
1391                         di->vddadc_en_ac = true;
1392                 }
1393
1394                 /* Check if the requested voltage or current is valid */
1395                 volt_index = ab8500_voltage_to_regval(vset);
1396                 curr_index = ab8500_current_to_regval(di, iset);
1397                 input_curr_index = ab8500_current_to_regval(di,
1398                         di->bm->chg_params->ac_curr_max);
1399                 if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
1400                         dev_err(di->dev,
1401                                 "Charger voltage or current too high, "
1402                                 "charging not started\n");
1403                         return -ENXIO;
1404                 }
1405
1406                 /* ChVoltLevel: maximum battery charging voltage */
1407                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1408                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1409                 if (ret) {
1410                         dev_err(di->dev, "%s write failed\n", __func__);
1411                         return ret;
1412                 }
1413                 /* MainChInputCurr: current that can be drawn from the charger*/
1414                 ret = ab8500_charger_set_main_in_curr(di,
1415                         di->bm->chg_params->ac_curr_max);
1416                 if (ret) {
1417                         dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
1418                                 __func__);
1419                         return ret;
1420                 }
1421                 /* ChOutputCurentLevel: protected output current */
1422                 ret = ab8500_charger_set_output_curr(di, iset);
1423                 if (ret) {
1424                         dev_err(di->dev, "%s "
1425                                 "Failed to set ChOutputCurentLevel\n",
1426                                 __func__);
1427                         return ret;
1428                 }
1429
1430                 /* Check if VBAT overshoot control should be enabled */
1431                 if (!di->bm->enable_overshoot)
1432                         overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
1433
1434                 /* Enable Main Charger */
1435                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1436                         AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
1437                 if (ret) {
1438                         dev_err(di->dev, "%s write failed\n", __func__);
1439                         return ret;
1440                 }
1441
1442                 /* Power on charging LED indication */
1443                 ret = ab8500_charger_led_en(di, true);
1444                 if (ret < 0)
1445                         dev_err(di->dev, "failed to enable LED\n");
1446
1447                 di->ac.charger_online = 1;
1448         } else {
1449                 /* Disable AC charging */
1450                 if (is_ab8500_1p1_or_earlier(di->parent)) {
1451                         /*
1452                          * For ABB revision 1.0 and 1.1 there is a bug in the
1453                          * watchdog logic. That means we have to continously
1454                          * kick the charger watchdog even when no charger is
1455                          * connected. This is only valid once the AC charger
1456                          * has been enabled. This is a bug that is not handled
1457                          * by the algorithm and the watchdog have to be kicked
1458                          * by the charger driver when the AC charger
1459                          * is disabled
1460                          */
1461                         if (di->ac_conn) {
1462                                 queue_delayed_work(di->charger_wq,
1463                                         &di->kick_wd_work,
1464                                         round_jiffies(WD_KICK_INTERVAL));
1465                         }
1466
1467                         /*
1468                          * We can't turn off charging completely
1469                          * due to a bug in AB8500 cut1.
1470                          * If we do, charging will not start again.
1471                          * That is why we set the lowest voltage
1472                          * and current possible
1473                          */
1474                         ret = abx500_set_register_interruptible(di->dev,
1475                                 AB8500_CHARGER,
1476                                 AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
1477                         if (ret) {
1478                                 dev_err(di->dev,
1479                                         "%s write failed\n", __func__);
1480                                 return ret;
1481                         }
1482
1483                         ret = ab8500_charger_set_output_curr(di, 0);
1484                         if (ret) {
1485                                 dev_err(di->dev, "%s "
1486                                         "Failed to set ChOutputCurentLevel\n",
1487                                         __func__);
1488                                 return ret;
1489                         }
1490                 } else {
1491                         ret = abx500_set_register_interruptible(di->dev,
1492                                 AB8500_CHARGER,
1493                                 AB8500_MCH_CTRL1, 0);
1494                         if (ret) {
1495                                 dev_err(di->dev,
1496                                         "%s write failed\n", __func__);
1497                                 return ret;
1498                         }
1499                 }
1500
1501                 ret = ab8500_charger_led_en(di, false);
1502                 if (ret < 0)
1503                         dev_err(di->dev, "failed to disable LED\n");
1504
1505                 di->ac.charger_online = 0;
1506                 di->ac.wd_expired = false;
1507
1508                 /* Disable regulator if enabled */
1509                 if (di->vddadc_en_ac) {
1510                         regulator_disable(di->regu);
1511                         di->vddadc_en_ac = false;
1512                 }
1513
1514                 dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
1515         }
1516         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1517
1518         return ret;
1519 }
1520
1521 /**
1522  * ab8500_charger_usb_en() - enable usb charging
1523  * @di:         pointer to the ab8500_charger structure
1524  * @enable:     enable/disable flag
1525  * @vset:       charging voltage
1526  * @ich_out:    charger output current
1527  *
1528  * Enable/Disable USB charging and turns on/off the charging led respectively.
1529  * Returns error code in case of failure else 0(on success)
1530  */
1531 static int ab8500_charger_usb_en(struct ux500_charger *charger,
1532         int enable, int vset, int ich_out)
1533 {
1534         int ret;
1535         int volt_index;
1536         int curr_index;
1537         u8 overshoot = 0;
1538
1539         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1540
1541         if (enable) {
1542                 /* Check if USB is connected */
1543                 if (!di->usb.charger_connected) {
1544                         dev_err(di->dev, "USB charger not connected\n");
1545                         return -ENXIO;
1546                 }
1547
1548                 /*
1549                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1550                  * will be triggered everytime we enable the VDD ADC supply.
1551                  * This will turn off charging for a short while.
1552                  * It can be avoided by having the supply on when
1553                  * there is a charger enabled. Normally the VDD ADC supply
1554                  * is enabled everytime a GPADC conversion is triggered. We will
1555                  * force it to be enabled from this driver to have
1556                  * the GPADC module independant of the AB8500 chargers
1557                  */
1558                 if (!di->vddadc_en_usb) {
1559                         regulator_enable(di->regu);
1560                         di->vddadc_en_usb = true;
1561                 }
1562
1563                 /* Enable USB charging */
1564                 dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
1565
1566                 /* Check if the requested voltage or current is valid */
1567                 volt_index = ab8500_voltage_to_regval(vset);
1568                 curr_index = ab8500_current_to_regval(di, ich_out);
1569                 if (volt_index < 0 || curr_index < 0) {
1570                         dev_err(di->dev,
1571                                 "Charger voltage or current too high, "
1572                                 "charging not started\n");
1573                         return -ENXIO;
1574                 }
1575
1576                 /* ChVoltLevel: max voltage upto which battery can be charged */
1577                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1578                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1579                 if (ret) {
1580                         dev_err(di->dev, "%s write failed\n", __func__);
1581                         return ret;
1582                 }
1583                 /* Check if VBAT overshoot control should be enabled */
1584                 if (!di->bm->enable_overshoot)
1585                         overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
1586
1587                 /* Enable USB Charger */
1588                 dev_dbg(di->dev,
1589                         "Enabling USB with write to AB8500_USBCH_CTRL1_REG\n");
1590                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1591                         AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
1592                 if (ret) {
1593                         dev_err(di->dev, "%s write failed\n", __func__);
1594                         return ret;
1595                 }
1596
1597                 /* If success power on charging LED indication */
1598                 ret = ab8500_charger_led_en(di, true);
1599                 if (ret < 0)
1600                         dev_err(di->dev, "failed to enable LED\n");
1601
1602                 di->usb.charger_online = 1;
1603
1604                 /* USBChInputCurr: current that can be drawn from the usb */
1605                 ret = ab8500_charger_set_vbus_in_curr(di,
1606                                         di->max_usb_in_curr.usb_type_max);
1607                 if (ret) {
1608                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1609                         return ret;
1610                 }
1611
1612                 /* ChOutputCurentLevel: protected output current */
1613                 ret = ab8500_charger_set_output_curr(di, ich_out);
1614                 if (ret) {
1615                         dev_err(di->dev, "%s "
1616                                 "Failed to set ChOutputCurentLevel\n",
1617                                 __func__);
1618                         return ret;
1619                 }
1620
1621                 queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
1622
1623         } else {
1624                 /* Disable USB charging */
1625                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1626                 ret = abx500_set_register_interruptible(di->dev,
1627                         AB8500_CHARGER,
1628                         AB8500_USBCH_CTRL1_REG, 0);
1629                 if (ret) {
1630                         dev_err(di->dev,
1631                                 "%s write failed\n", __func__);
1632                         return ret;
1633                 }
1634
1635                 ret = ab8500_charger_led_en(di, false);
1636                 if (ret < 0)
1637                         dev_err(di->dev, "failed to disable LED\n");
1638                 /* USBChInputCurr: current that can be drawn from the usb */
1639                 ret = ab8500_charger_set_vbus_in_curr(di, 0);
1640                 if (ret) {
1641                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1642                         return ret;
1643                 }
1644
1645                 /* ChOutputCurentLevel: protected output current */
1646                 ret = ab8500_charger_set_output_curr(di, 0);
1647                 if (ret) {
1648                         dev_err(di->dev, "%s "
1649                                 "Failed to reset ChOutputCurentLevel\n",
1650                                 __func__);
1651                         return ret;
1652                 }
1653                 di->usb.charger_online = 0;
1654                 di->usb.wd_expired = false;
1655
1656                 /* Disable regulator if enabled */
1657                 if (di->vddadc_en_usb) {
1658                         regulator_disable(di->regu);
1659                         di->vddadc_en_usb = false;
1660                 }
1661
1662                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1663
1664                 /* Cancel any pending Vbat check work */
1665                 cancel_delayed_work(&di->check_vbat_work);
1666
1667         }
1668         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1669
1670         return ret;
1671 }
1672
1673 static int ab8500_external_charger_prepare(struct notifier_block *charger_nb,
1674                                 unsigned long event, void *data)
1675 {
1676         int ret;
1677         struct device *dev = data;
1678         /*Toggle External charger control pin*/
1679         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1680                                   AB8500_SYS_CHARGER_CONTROL_REG,
1681                                   EXTERNAL_CHARGER_DISABLE_REG_VAL);
1682         if (ret < 0) {
1683                 dev_err(dev, "write reg failed %d\n", ret);
1684                 goto out;
1685         }
1686         ret = abx500_set_register_interruptible(dev, AB8500_SYS_CTRL1_BLOCK,
1687                                   AB8500_SYS_CHARGER_CONTROL_REG,
1688                                   EXTERNAL_CHARGER_ENABLE_REG_VAL);
1689         if (ret < 0)
1690                 dev_err(dev, "Write reg failed %d\n", ret);
1691
1692 out:
1693         return ret;
1694 }
1695
1696 /**
1697  * ab8500_charger_usb_check_enable() - enable usb charging
1698  * @charger:    pointer to the ux500_charger structure
1699  * @vset:       charging voltage
1700  * @iset:       charger output current
1701  *
1702  * Check if the VBUS charger has been disconnected and reconnected without
1703  * AB8500 rising an interrupt. Returns 0 on success.
1704  */
1705 static int ab8500_charger_usb_check_enable(struct ux500_charger *charger,
1706         int vset, int iset)
1707 {
1708         u8 usbch_ctrl1 = 0;
1709         int ret = 0;
1710
1711         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1712
1713         if (!di->usb.charger_connected)
1714                 return ret;
1715
1716         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1717                                 AB8500_USBCH_CTRL1_REG, &usbch_ctrl1);
1718         if (ret < 0) {
1719                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1720                 return ret;
1721         }
1722         dev_dbg(di->dev, "USB charger ctrl: 0x%02x\n", usbch_ctrl1);
1723
1724         if (!(usbch_ctrl1 & USB_CH_ENA)) {
1725                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1726
1727                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1728                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1729                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1730                 if (ret < 0) {
1731                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1732                         return ret;
1733                 }
1734
1735                 ret = ab8500_charger_usb_en(&di->usb_chg, true, vset, iset);
1736                 if (ret < 0) {
1737                         dev_err(di->dev, "Failed to enable VBUS charger %d\n",
1738                                         __LINE__);
1739                         return ret;
1740                 }
1741         }
1742         return ret;
1743 }
1744
1745 /**
1746  * ab8500_charger_ac_check_enable() - enable usb charging
1747  * @charger:    pointer to the ux500_charger structure
1748  * @vset:       charging voltage
1749  * @iset:       charger output current
1750  *
1751  * Check if the AC charger has been disconnected and reconnected without
1752  * AB8500 rising an interrupt. Returns 0 on success.
1753  */
1754 static int ab8500_charger_ac_check_enable(struct ux500_charger *charger,
1755         int vset, int iset)
1756 {
1757         u8 mainch_ctrl1 = 0;
1758         int ret = 0;
1759
1760         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1761
1762         if (!di->ac.charger_connected)
1763                 return ret;
1764
1765         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
1766                                 AB8500_MCH_CTRL1, &mainch_ctrl1);
1767         if (ret < 0) {
1768                 dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
1769                 return ret;
1770         }
1771         dev_dbg(di->dev, "AC charger ctrl: 0x%02x\n", mainch_ctrl1);
1772
1773         if (!(mainch_ctrl1 & MAIN_CH_ENA)) {
1774                 dev_info(di->dev, "Charging has been disabled abnormally and will be re-enabled\n");
1775
1776                 ret = abx500_mask_and_set_register_interruptible(di->dev,
1777                                         AB8500_CHARGER, AB8500_CHARGER_CTRL,
1778                                         DROP_COUNT_RESET, DROP_COUNT_RESET);
1779
1780                 if (ret < 0) {
1781                         dev_err(di->dev, "ab8500 write failed %d\n", __LINE__);
1782                         return ret;
1783                 }
1784
1785                 ret = ab8500_charger_ac_en(&di->usb_chg, true, vset, iset);
1786                 if (ret < 0) {
1787                         dev_err(di->dev, "failed to enable AC charger %d\n",
1788                                 __LINE__);
1789                         return ret;
1790                 }
1791         }
1792         return ret;
1793 }
1794
1795 /**
1796  * ab8500_charger_watchdog_kick() - kick charger watchdog
1797  * @di:         pointer to the ab8500_charger structure
1798  *
1799  * Kick charger watchdog
1800  * Returns error code in case of failure else 0(on success)
1801  */
1802 static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
1803 {
1804         int ret;
1805         struct ab8500_charger *di;
1806
1807         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1808                 di = to_ab8500_charger_ac_device_info(charger);
1809         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1810                 di = to_ab8500_charger_usb_device_info(charger);
1811         else
1812                 return -ENXIO;
1813
1814         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1815                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1816         if (ret)
1817                 dev_err(di->dev, "Failed to kick WD!\n");
1818
1819         return ret;
1820 }
1821
1822 /**
1823  * ab8500_charger_update_charger_current() - update charger current
1824  * @di:         pointer to the ab8500_charger structure
1825  *
1826  * Update the charger output current for the specified charger
1827  * Returns error code in case of failure else 0(on success)
1828  */
1829 static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
1830                 int ich_out)
1831 {
1832         int ret;
1833         struct ab8500_charger *di;
1834
1835         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1836                 di = to_ab8500_charger_ac_device_info(charger);
1837         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1838                 di = to_ab8500_charger_usb_device_info(charger);
1839         else
1840                 return -ENXIO;
1841
1842         ret = ab8500_charger_set_output_curr(di, ich_out);
1843         if (ret) {
1844                 dev_err(di->dev, "%s "
1845                         "Failed to set ChOutputCurentLevel\n",
1846                         __func__);
1847                 return ret;
1848         }
1849
1850         /* Reset the main and usb drop input current measurement counter */
1851         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1852                                 AB8500_CHARGER_CTRL, DROP_COUNT_RESET);
1853         if (ret) {
1854                 dev_err(di->dev, "%s write failed\n", __func__);
1855                 return ret;
1856         }
1857
1858         return ret;
1859 }
1860
1861 /**
1862  * ab8540_charger_power_path_enable() - enable usb power path mode
1863  * @charger:    pointer to the ux500_charger structure
1864  * @enable:     enable/disable flag
1865  *
1866  * Enable or disable the power path for usb mode
1867  * Returns error code in case of failure else 0(on success)
1868  */
1869 static int ab8540_charger_power_path_enable(struct ux500_charger *charger,
1870                 bool enable)
1871 {
1872         int ret;
1873         struct ab8500_charger *di;
1874
1875         if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1876                 di = to_ab8500_charger_usb_device_info(charger);
1877         else
1878                 return -ENXIO;
1879
1880         ret = abx500_mask_and_set_register_interruptible(di->dev,
1881                                 AB8500_CHARGER, AB8540_USB_PP_MODE_REG,
1882                                 BUS_POWER_PATH_MODE_ENA, enable);
1883         if (ret) {
1884                 dev_err(di->dev, "%s write failed\n", __func__);
1885                 return ret;
1886         }
1887
1888         return ret;
1889 }
1890
1891
1892 /**
1893  * ab8540_charger_usb_pre_chg_enable() - enable usb pre change
1894  * @charger:    pointer to the ux500_charger structure
1895  * @enable:     enable/disable flag
1896  *
1897  * Enable or disable the pre-chage for usb mode
1898  * Returns error code in case of failure else 0(on success)
1899  */
1900 static int ab8540_charger_usb_pre_chg_enable(struct ux500_charger *charger,
1901                 bool enable)
1902 {
1903         int ret;
1904         struct ab8500_charger *di;
1905
1906         if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1907                 di = to_ab8500_charger_usb_device_info(charger);
1908         else
1909                 return -ENXIO;
1910
1911         ret = abx500_mask_and_set_register_interruptible(di->dev,
1912                                 AB8500_CHARGER, AB8540_USB_PP_CHR_REG,
1913                                 BUS_POWER_PATH_PRECHG_ENA, enable);
1914         if (ret) {
1915                 dev_err(di->dev, "%s write failed\n", __func__);
1916                 return ret;
1917         }
1918
1919         return ret;
1920 }
1921
1922 static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
1923 {
1924         struct power_supply *psy;
1925         struct power_supply *ext;
1926         struct ab8500_charger *di;
1927         union power_supply_propval ret;
1928         int i, j;
1929         bool psy_found = false;
1930         struct ux500_charger *usb_chg;
1931
1932         usb_chg = (struct ux500_charger *)data;
1933         psy = &usb_chg->psy;
1934
1935         di = to_ab8500_charger_usb_device_info(usb_chg);
1936
1937         ext = dev_get_drvdata(dev);
1938
1939         /* For all psy where the driver name appears in any supplied_to */
1940         for (i = 0; i < ext->num_supplicants; i++) {
1941                 if (!strcmp(ext->supplied_to[i], psy->name))
1942                         psy_found = true;
1943         }
1944
1945         if (!psy_found)
1946                 return 0;
1947
1948         /* Go through all properties for the psy */
1949         for (j = 0; j < ext->num_properties; j++) {
1950                 enum power_supply_property prop;
1951                 prop = ext->properties[j];
1952
1953                 if (ext->get_property(ext, prop, &ret))
1954                         continue;
1955
1956                 switch (prop) {
1957                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1958                         switch (ext->type) {
1959                         case POWER_SUPPLY_TYPE_BATTERY:
1960                                 di->vbat = ret.intval / 1000;
1961                                 break;
1962                         default:
1963                                 break;
1964                         }
1965                         break;
1966                 default:
1967                         break;
1968                 }
1969         }
1970         return 0;
1971 }
1972
1973 /**
1974  * ab8500_charger_check_vbat_work() - keep vbus current within spec
1975  * @work        pointer to the work_struct structure
1976  *
1977  * Due to a asic bug it is necessary to lower the input current to the vbus
1978  * charger when charging with at some specific levels. This issue is only valid
1979  * for below a certain battery voltage. This function makes sure that the
1980  * the allowed current limit isn't exceeded.
1981  */
1982 static void ab8500_charger_check_vbat_work(struct work_struct *work)
1983 {
1984         int t = 10;
1985         struct ab8500_charger *di = container_of(work,
1986                 struct ab8500_charger, check_vbat_work.work);
1987
1988         class_for_each_device(power_supply_class, NULL,
1989                 &di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
1990
1991         /* First run old_vbat is 0. */
1992         if (di->old_vbat == 0)
1993                 di->old_vbat = di->vbat;
1994
1995         if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
1996                 di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
1997                 (di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
1998                 di->vbat > VBAT_TRESH_IP_CUR_RED))) {
1999
2000                 dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
2001                         " old: %d\n", di->max_usb_in_curr.usb_type_max,
2002                         di->vbat, di->old_vbat);
2003                 ab8500_charger_set_vbus_in_curr(di,
2004                                         di->max_usb_in_curr.usb_type_max);
2005                 power_supply_changed(&di->usb_chg.psy);
2006         }
2007
2008         di->old_vbat = di->vbat;
2009
2010         /*
2011          * No need to check the battery voltage every second when not close to
2012          * the threshold.
2013          */
2014         if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
2015                 (di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
2016                         t = 1;
2017
2018         queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
2019 }
2020
2021 /**
2022  * ab8500_charger_check_hw_failure_work() - check main charger failure
2023  * @work:       pointer to the work_struct structure
2024  *
2025  * Work queue function for checking the main charger status
2026  */
2027 static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
2028 {
2029         int ret;
2030         u8 reg_value;
2031
2032         struct ab8500_charger *di = container_of(work,
2033                 struct ab8500_charger, check_hw_failure_work.work);
2034
2035         /* Check if the status bits for HW failure is still active */
2036         if (di->flags.mainextchnotok) {
2037                 ret = abx500_get_register_interruptible(di->dev,
2038                         AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2039                 if (ret < 0) {
2040                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2041                         return;
2042                 }
2043                 if (!(reg_value & MAIN_CH_NOK)) {
2044                         di->flags.mainextchnotok = false;
2045                         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2046                 }
2047         }
2048         if (di->flags.vbus_ovv) {
2049                 ret = abx500_get_register_interruptible(di->dev,
2050                         AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
2051                         &reg_value);
2052                 if (ret < 0) {
2053                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2054                         return;
2055                 }
2056                 if (!(reg_value & VBUS_OVV_TH)) {
2057                         di->flags.vbus_ovv = false;
2058                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2059                 }
2060         }
2061         /* If we still have a failure, schedule a new check */
2062         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
2063                 queue_delayed_work(di->charger_wq,
2064                         &di->check_hw_failure_work, round_jiffies(HZ));
2065         }
2066 }
2067
2068 /**
2069  * ab8500_charger_kick_watchdog_work() - kick the watchdog
2070  * @work:       pointer to the work_struct structure
2071  *
2072  * Work queue function for kicking the charger watchdog.
2073  *
2074  * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
2075  * logic. That means we have to continously kick the charger
2076  * watchdog even when no charger is connected. This is only
2077  * valid once the AC charger has been enabled. This is
2078  * a bug that is not handled by the algorithm and the
2079  * watchdog have to be kicked by the charger driver
2080  * when the AC charger is disabled
2081  */
2082 static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
2083 {
2084         int ret;
2085
2086         struct ab8500_charger *di = container_of(work,
2087                 struct ab8500_charger, kick_wd_work.work);
2088
2089         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2090                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
2091         if (ret)
2092                 dev_err(di->dev, "Failed to kick WD!\n");
2093
2094         /* Schedule a new watchdog kick */
2095         queue_delayed_work(di->charger_wq,
2096                 &di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
2097 }
2098
2099 /**
2100  * ab8500_charger_ac_work() - work to get and set main charger status
2101  * @work:       pointer to the work_struct structure
2102  *
2103  * Work queue function for checking the main charger status
2104  */
2105 static void ab8500_charger_ac_work(struct work_struct *work)
2106 {
2107         int ret;
2108
2109         struct ab8500_charger *di = container_of(work,
2110                 struct ab8500_charger, ac_work);
2111
2112         /*
2113          * Since we can't be sure that the events are received
2114          * synchronously, we have the check if the main charger is
2115          * connected by reading the status register
2116          */
2117         ret = ab8500_charger_detect_chargers(di, false);
2118         if (ret < 0)
2119                 return;
2120
2121         if (ret & AC_PW_CONN) {
2122                 di->ac.charger_connected = 1;
2123                 di->ac_conn = true;
2124         } else {
2125                 di->ac.charger_connected = 0;
2126         }
2127
2128         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2129         sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
2130 }
2131
2132 static void ab8500_charger_usb_attached_work(struct work_struct *work)
2133 {
2134         struct ab8500_charger *di = container_of(work,
2135                                                  struct ab8500_charger,
2136                                                  usb_charger_attached_work.work);
2137         int usbch = (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC);
2138         int ret, i;
2139         u8 statval;
2140
2141         for (i = 0; i < 10; i++) {
2142                 ret = abx500_get_register_interruptible(di->dev,
2143                                                         AB8500_CHARGER,
2144                                                         AB8500_CH_USBCH_STAT1_REG,
2145                                                         &statval);
2146                 if (ret < 0) {
2147                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2148                         goto reschedule;
2149                 }
2150                 if ((statval & usbch) != usbch)
2151                         goto reschedule;
2152
2153                 msleep(CHARGER_STATUS_POLL);
2154         }
2155
2156         ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0);
2157
2158         mutex_lock(&di->charger_attached_mutex);
2159         mutex_unlock(&di->charger_attached_mutex);
2160
2161         return;
2162
2163 reschedule:
2164         queue_delayed_work(di->charger_wq,
2165                            &di->usb_charger_attached_work,
2166                            HZ);
2167 }
2168
2169 static void ab8500_charger_ac_attached_work(struct work_struct *work)
2170 {
2171
2172         struct ab8500_charger *di = container_of(work,
2173                                                  struct ab8500_charger,
2174                                                  ac_charger_attached_work.work);
2175         int mainch = (MAIN_CH_STATUS2_MAINCHGDROP |
2176                       MAIN_CH_STATUS2_MAINCHARGERDETDBNC);
2177         int ret, i;
2178         u8 statval;
2179
2180         for (i = 0; i < 10; i++) {
2181                 ret = abx500_get_register_interruptible(di->dev,
2182                                                         AB8500_CHARGER,
2183                                                         AB8500_CH_STATUS2_REG,
2184                                                         &statval);
2185                 if (ret < 0) {
2186                         dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
2187                         goto reschedule;
2188                 }
2189
2190                 if ((statval & mainch) != mainch)
2191                         goto reschedule;
2192
2193                 msleep(CHARGER_STATUS_POLL);
2194         }
2195
2196         ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0);
2197         queue_work(di->charger_wq, &di->ac_work);
2198
2199         mutex_lock(&di->charger_attached_mutex);
2200         mutex_unlock(&di->charger_attached_mutex);
2201
2202         return;
2203
2204 reschedule:
2205         queue_delayed_work(di->charger_wq,
2206                            &di->ac_charger_attached_work,
2207                            HZ);
2208 }
2209
2210 /**
2211  * ab8500_charger_detect_usb_type_work() - work to detect USB type
2212  * @work:       Pointer to the work_struct structure
2213  *
2214  * Detect the type of USB plugged
2215  */
2216 static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
2217 {
2218         int ret;
2219
2220         struct ab8500_charger *di = container_of(work,
2221                 struct ab8500_charger, detect_usb_type_work);
2222
2223         /*
2224          * Since we can't be sure that the events are received
2225          * synchronously, we have the check if is
2226          * connected by reading the status register
2227          */
2228         ret = ab8500_charger_detect_chargers(di, false);
2229         if (ret < 0)
2230                 return;
2231
2232         if (!(ret & USB_PW_CONN)) {
2233                 dev_dbg(di->dev, "%s di->vbus_detected = false\n", __func__);
2234                 di->vbus_detected = false;
2235                 ab8500_charger_set_usb_connected(di, false);
2236                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2237         } else {
2238                 dev_dbg(di->dev, "%s di->vbus_detected = true\n", __func__);
2239                 di->vbus_detected = true;
2240
2241                 if (is_ab8500_1p1_or_earlier(di->parent)) {
2242                         ret = ab8500_charger_detect_usb_type(di);
2243                         if (!ret) {
2244                                 ab8500_charger_set_usb_connected(di, true);
2245                                 ab8500_power_supply_changed(di,
2246                                                             &di->usb_chg.psy);
2247                         }
2248                 } else {
2249                         /*
2250                          * For ABB cut2.0 and onwards we have an IRQ,
2251                          * USB_LINK_STATUS that will be triggered when the USB
2252                          * link status changes. The exception is USB connected
2253                          * during startup. Then we don't get a
2254                          * USB_LINK_STATUS IRQ
2255                          */
2256                         if (di->vbus_detected_start) {
2257                                 di->vbus_detected_start = false;
2258                                 ret = ab8500_charger_detect_usb_type(di);
2259                                 if (!ret) {
2260                                         ab8500_charger_set_usb_connected(di,
2261                                                 true);
2262                                         ab8500_power_supply_changed(di,
2263                                                 &di->usb_chg.psy);
2264                                 }
2265                         }
2266                 }
2267         }
2268 }
2269
2270 /**
2271  * ab8500_charger_usb_link_attach_work() - work to detect USB type
2272  * @work:       pointer to the work_struct structure
2273  *
2274  * Detect the type of USB plugged
2275  */
2276 static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
2277 {
2278         struct ab8500_charger *di =
2279                 container_of(work, struct ab8500_charger, attach_work.work);
2280         int ret;
2281
2282         /* Update maximum input current if USB enumeration is not detected */
2283         if (!di->usb.charger_online) {
2284                 ret = ab8500_charger_set_vbus_in_curr(di,
2285                                         di->max_usb_in_curr.usb_type_max);
2286                 if (ret)
2287                         return;
2288         }
2289
2290         ab8500_charger_set_usb_connected(di, true);
2291         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2292 }
2293
2294 /**
2295  * ab8500_charger_usb_link_status_work() - work to detect USB type
2296  * @work:       pointer to the work_struct structure
2297  *
2298  * Detect the type of USB plugged
2299  */
2300 static void ab8500_charger_usb_link_status_work(struct work_struct *work)
2301 {
2302         int detected_chargers;
2303         int ret;
2304         u8 val;
2305         u8 link_status;
2306
2307         struct ab8500_charger *di = container_of(work,
2308                 struct ab8500_charger, usb_link_status_work);
2309
2310         /*
2311          * Since we can't be sure that the events are received
2312          * synchronously, we have the check if  is
2313          * connected by reading the status register
2314          */
2315         detected_chargers = ab8500_charger_detect_chargers(di, false);
2316         if (detected_chargers < 0)
2317                 return;
2318
2319         /*
2320          * Some chargers that breaks the USB spec is
2321          * identified as invalid by AB8500 and it refuse
2322          * to start the charging process. but by jumping
2323          * thru a few hoops it can be forced to start.
2324          */
2325         if (is_ab8500(di->parent))
2326                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2327                                         AB8500_USB_LINE_STAT_REG, &val);
2328         else
2329                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
2330                                         AB8500_USB_LINK1_STAT_REG, &val);
2331
2332         if (ret >= 0)
2333                 dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
2334         else
2335                 dev_dbg(di->dev, "Error reading USB link status\n");
2336
2337         if (is_ab8500(di->parent))
2338                 link_status = AB8500_USB_LINK_STATUS;
2339         else
2340                 link_status = AB8505_USB_LINK_STATUS;
2341
2342         if (detected_chargers & USB_PW_CONN) {
2343                 if (((val & link_status) >> USB_LINK_STATUS_SHIFT) ==
2344                                 USB_STAT_NOT_VALID_LINK &&
2345                                 di->invalid_charger_detect_state == 0) {
2346                         dev_dbg(di->dev,
2347                                         "Invalid charger detected, state= 0\n");
2348                         /*Enable charger*/
2349                         abx500_mask_and_set_register_interruptible(di->dev,
2350                                         AB8500_CHARGER, AB8500_USBCH_CTRL1_REG,
2351                                         USB_CH_ENA, USB_CH_ENA);
2352                         /*Enable charger detection*/
2353                         abx500_mask_and_set_register_interruptible(di->dev,
2354                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2355                                         USB_CH_DET, USB_CH_DET);
2356                         di->invalid_charger_detect_state = 1;
2357                         /*exit and wait for new link status interrupt.*/
2358                         return;
2359
2360                 }
2361                 if (di->invalid_charger_detect_state == 1) {
2362                         dev_dbg(di->dev,
2363                                         "Invalid charger detected, state= 1\n");
2364                         /*Stop charger detection*/
2365                         abx500_mask_and_set_register_interruptible(di->dev,
2366                                         AB8500_USB, AB8500_USB_LINE_CTRL2_REG,
2367                                         USB_CH_DET, 0x00);
2368                         /*Check link status*/
2369                         if (is_ab8500(di->parent))
2370                                 ret = abx500_get_register_interruptible(di->dev,
2371                                         AB8500_USB, AB8500_USB_LINE_STAT_REG,
2372                                         &val);
2373                         else
2374                                 ret = abx500_get_register_interruptible(di->dev,
2375                                         AB8500_USB, AB8500_USB_LINK1_STAT_REG,
2376                                         &val);
2377
2378                         dev_dbg(di->dev, "USB link status= 0x%02x\n",
2379                                 (val & link_status) >> USB_LINK_STATUS_SHIFT);
2380                         di->invalid_charger_detect_state = 2;
2381                 }
2382         } else {
2383                 di->invalid_charger_detect_state = 0;
2384         }
2385
2386         if (!(detected_chargers & USB_PW_CONN)) {
2387                 di->vbus_detected = false;
2388                 ab8500_charger_set_usb_connected(di, false);
2389                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2390                 return;
2391         }
2392
2393         dev_dbg(di->dev,"%s di->vbus_detected = true\n",__func__);
2394         di->vbus_detected = true;
2395         ret = ab8500_charger_read_usb_type(di);
2396         if (ret) {
2397                 if (ret == -ENXIO) {
2398                         /* No valid charger type detected */
2399                         ab8500_charger_set_usb_connected(di, false);
2400                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2401                 }
2402                 return;
2403         }
2404
2405         if (di->usb_device_is_unrecognised) {
2406                 dev_dbg(di->dev,
2407                         "Potential Legacy Charger device. "
2408                         "Delay work for %d msec for USB enum "
2409                         "to finish",
2410                         WAIT_ACA_RID_ENUMERATION);
2411                 queue_delayed_work(di->charger_wq,
2412                                    &di->attach_work,
2413                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2414         } else if (di->is_aca_rid == 1) {
2415                 /* Only wait once */
2416                 di->is_aca_rid++;
2417                 dev_dbg(di->dev,
2418                         "%s Wait %d msec for USB enum to finish",
2419                         __func__, WAIT_ACA_RID_ENUMERATION);
2420                 queue_delayed_work(di->charger_wq,
2421                                    &di->attach_work,
2422                                    msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
2423         } else {
2424                 queue_delayed_work(di->charger_wq,
2425                                    &di->attach_work,
2426                                    0);
2427         }
2428 }
2429
2430 static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
2431 {
2432         int ret;
2433         unsigned long flags;
2434
2435         struct ab8500_charger *di = container_of(work,
2436                 struct ab8500_charger, usb_state_changed_work.work);
2437
2438         if (!di->vbus_detected) {
2439                 dev_dbg(di->dev,
2440                         "%s !di->vbus_detected\n",
2441                         __func__);
2442                 return;
2443         }
2444
2445         spin_lock_irqsave(&di->usb_state.usb_lock, flags);
2446         di->usb_state.state = di->usb_state.state_tmp;
2447         di->usb_state.usb_current = di->usb_state.usb_current_tmp;
2448         spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
2449
2450         dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
2451                 __func__, di->usb_state.state, di->usb_state.usb_current);
2452
2453         switch (di->usb_state.state) {
2454         case AB8500_BM_USB_STATE_RESET_HS:
2455         case AB8500_BM_USB_STATE_RESET_FS:
2456         case AB8500_BM_USB_STATE_SUSPEND:
2457         case AB8500_BM_USB_STATE_MAX:
2458                 ab8500_charger_set_usb_connected(di, false);
2459                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2460                 break;
2461
2462         case AB8500_BM_USB_STATE_RESUME:
2463                 /*
2464                  * when suspend->resume there should be delay
2465                  * of 1sec for enabling charging
2466                  */
2467                 msleep(1000);
2468                 /* Intentional fall through */
2469         case AB8500_BM_USB_STATE_CONFIGURED:
2470                 /*
2471                  * USB is configured, enable charging with the charging
2472                  * input current obtained from USB driver
2473                  */
2474                 if (!ab8500_charger_get_usb_cur(di)) {
2475                         /* Update maximum input current */
2476                         ret = ab8500_charger_set_vbus_in_curr(di,
2477                                         di->max_usb_in_curr.usb_type_max);
2478                         if (ret)
2479                                 return;
2480
2481                         ab8500_charger_set_usb_connected(di, true);
2482                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2483                 }
2484                 break;
2485
2486         default:
2487                 break;
2488         };
2489 }
2490
2491 /**
2492  * ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
2493  * @work:       pointer to the work_struct structure
2494  *
2495  * Work queue function for checking the USB charger Not OK status
2496  */
2497 static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
2498 {
2499         int ret;
2500         u8 reg_value;
2501         bool prev_status;
2502
2503         struct ab8500_charger *di = container_of(work,
2504                 struct ab8500_charger, check_usbchgnotok_work.work);
2505
2506         /* Check if the status bit for usbchargernotok is still active */
2507         ret = abx500_get_register_interruptible(di->dev,
2508                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2509         if (ret < 0) {
2510                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2511                 return;
2512         }
2513         prev_status = di->flags.usbchargernotok;
2514
2515         if (reg_value & VBUS_CH_NOK) {
2516                 di->flags.usbchargernotok = true;
2517                 /* Check again in 1sec */
2518                 queue_delayed_work(di->charger_wq,
2519                         &di->check_usbchgnotok_work, HZ);
2520         } else {
2521                 di->flags.usbchargernotok = false;
2522                 di->flags.vbus_collapse = false;
2523         }
2524
2525         if (prev_status != di->flags.usbchargernotok)
2526                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2527 }
2528
2529 /**
2530  * ab8500_charger_check_main_thermal_prot_work() - check main thermal status
2531  * @work:       pointer to the work_struct structure
2532  *
2533  * Work queue function for checking the Main thermal prot status
2534  */
2535 static void ab8500_charger_check_main_thermal_prot_work(
2536         struct work_struct *work)
2537 {
2538         int ret;
2539         u8 reg_value;
2540
2541         struct ab8500_charger *di = container_of(work,
2542                 struct ab8500_charger, check_main_thermal_prot_work);
2543
2544         /* Check if the status bit for main_thermal_prot is still active */
2545         ret = abx500_get_register_interruptible(di->dev,
2546                 AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
2547         if (ret < 0) {
2548                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2549                 return;
2550         }
2551         if (reg_value & MAIN_CH_TH_PROT)
2552                 di->flags.main_thermal_prot = true;
2553         else
2554                 di->flags.main_thermal_prot = false;
2555
2556         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2557 }
2558
2559 /**
2560  * ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
2561  * @work:       pointer to the work_struct structure
2562  *
2563  * Work queue function for checking the USB thermal prot status
2564  */
2565 static void ab8500_charger_check_usb_thermal_prot_work(
2566         struct work_struct *work)
2567 {
2568         int ret;
2569         u8 reg_value;
2570
2571         struct ab8500_charger *di = container_of(work,
2572                 struct ab8500_charger, check_usb_thermal_prot_work);
2573
2574         /* Check if the status bit for usb_thermal_prot is still active */
2575         ret = abx500_get_register_interruptible(di->dev,
2576                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
2577         if (ret < 0) {
2578                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
2579                 return;
2580         }
2581         if (reg_value & USB_CH_TH_PROT)
2582                 di->flags.usb_thermal_prot = true;
2583         else
2584                 di->flags.usb_thermal_prot = false;
2585
2586         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2587 }
2588
2589 /**
2590  * ab8500_charger_mainchunplugdet_handler() - main charger unplugged
2591  * @irq:       interrupt number
2592  * @_di:       pointer to the ab8500_charger structure
2593  *
2594  * Returns IRQ status(IRQ_HANDLED)
2595  */
2596 static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
2597 {
2598         struct ab8500_charger *di = _di;
2599
2600         dev_dbg(di->dev, "Main charger unplugged\n");
2601         queue_work(di->charger_wq, &di->ac_work);
2602
2603         cancel_delayed_work_sync(&di->ac_charger_attached_work);
2604         mutex_lock(&di->charger_attached_mutex);
2605         mutex_unlock(&di->charger_attached_mutex);
2606
2607         return IRQ_HANDLED;
2608 }
2609
2610 /**
2611  * ab8500_charger_mainchplugdet_handler() - main charger plugged
2612  * @irq:       interrupt number
2613  * @_di:       pointer to the ab8500_charger structure
2614  *
2615  * Returns IRQ status(IRQ_HANDLED)
2616  */
2617 static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
2618 {
2619         struct ab8500_charger *di = _di;
2620
2621         dev_dbg(di->dev, "Main charger plugged\n");
2622         queue_work(di->charger_wq, &di->ac_work);
2623
2624         mutex_lock(&di->charger_attached_mutex);
2625         mutex_unlock(&di->charger_attached_mutex);
2626
2627         if (is_ab8500(di->parent))
2628                 queue_delayed_work(di->charger_wq,
2629                            &di->ac_charger_attached_work,
2630                            HZ);
2631         return IRQ_HANDLED;
2632 }
2633
2634 /**
2635  * ab8500_charger_mainextchnotok_handler() - main charger not ok
2636  * @irq:       interrupt number
2637  * @_di:       pointer to the ab8500_charger structure
2638  *
2639  * Returns IRQ status(IRQ_HANDLED)
2640  */
2641 static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
2642 {
2643         struct ab8500_charger *di = _di;
2644
2645         dev_dbg(di->dev, "Main charger not ok\n");
2646         di->flags.mainextchnotok = true;
2647         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2648
2649         /* Schedule a new HW failure check */
2650         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2651
2652         return IRQ_HANDLED;
2653 }
2654
2655 /**
2656  * ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
2657  * thermal protection threshold
2658  * @irq:       interrupt number
2659  * @_di:       pointer to the ab8500_charger structure
2660  *
2661  * Returns IRQ status(IRQ_HANDLED)
2662  */
2663 static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
2664 {
2665         struct ab8500_charger *di = _di;
2666
2667         dev_dbg(di->dev,
2668                 "Die temp above Main charger thermal protection threshold\n");
2669         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2670
2671         return IRQ_HANDLED;
2672 }
2673
2674 /**
2675  * ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
2676  * thermal protection threshold
2677  * @irq:       interrupt number
2678  * @_di:       pointer to the ab8500_charger structure
2679  *
2680  * Returns IRQ status(IRQ_HANDLED)
2681  */
2682 static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
2683 {
2684         struct ab8500_charger *di = _di;
2685
2686         dev_dbg(di->dev,
2687                 "Die temp ok for Main charger thermal protection threshold\n");
2688         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2689
2690         return IRQ_HANDLED;
2691 }
2692
2693 static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
2694 {
2695         struct ab8500_charger *di = container_of(work,
2696                 struct ab8500_charger, vbus_drop_end_work.work);
2697         int ret, curr;
2698         u8 reg_value;
2699
2700         di->flags.vbus_drop_end = false;
2701
2702         /* Reset the drop counter */
2703         abx500_set_register_interruptible(di->dev,
2704                                   AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
2705
2706         if (is_ab8540(di->parent))
2707                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2708                                 AB8540_CH_USBCH_STAT3_REG, &reg_value);
2709         else
2710                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
2711                                 AB8500_CH_USBCH_STAT2_REG, &reg_value);
2712         if (ret < 0) {
2713                 dev_err(di->dev, "%s read failed\n", __func__);
2714                 return;
2715         }
2716
2717         if (is_ab8540(di->parent))
2718                 curr = di->bm->chg_input_curr[
2719                         reg_value & AB8540_AUTO_VBUS_IN_CURR_MASK];
2720         else
2721                 curr = di->bm->chg_input_curr[
2722                         reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT];
2723
2724         if (di->max_usb_in_curr.calculated_max != curr) {
2725                 /* USB source is collapsing */
2726                 di->max_usb_in_curr.calculated_max = curr;
2727                 dev_dbg(di->dev,
2728                          "VBUS input current limiting to %d mA\n",
2729                          di->max_usb_in_curr.calculated_max);
2730         } else {
2731                 /*
2732                  * USB source can not give more than this amount.
2733                  * Taking more will collapse the source.
2734                  */
2735                 di->max_usb_in_curr.set_max =
2736                         di->max_usb_in_curr.calculated_max;
2737                 dev_dbg(di->dev,
2738                          "VBUS input current limited to %d mA\n",
2739                          di->max_usb_in_curr.set_max);
2740         }
2741
2742         if (di->usb.charger_connected)
2743                 ab8500_charger_set_vbus_in_curr(di,
2744                                         di->max_usb_in_curr.usb_type_max);
2745 }
2746
2747 /**
2748  * ab8500_charger_vbusdetf_handler() - VBUS falling detected
2749  * @irq:       interrupt number
2750  * @_di:       pointer to the ab8500_charger structure
2751  *
2752  * Returns IRQ status(IRQ_HANDLED)
2753  */
2754 static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
2755 {
2756         struct ab8500_charger *di = _di;
2757
2758         di->vbus_detected = false;
2759         dev_dbg(di->dev, "VBUS falling detected\n");
2760         queue_work(di->charger_wq, &di->detect_usb_type_work);
2761
2762         return IRQ_HANDLED;
2763 }
2764
2765 /**
2766  * ab8500_charger_vbusdetr_handler() - VBUS rising detected
2767  * @irq:       interrupt number
2768  * @_di:       pointer to the ab8500_charger structure
2769  *
2770  * Returns IRQ status(IRQ_HANDLED)
2771  */
2772 static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
2773 {
2774         struct ab8500_charger *di = _di;
2775
2776         di->vbus_detected = true;
2777         dev_dbg(di->dev, "VBUS rising detected\n");
2778
2779         queue_work(di->charger_wq, &di->detect_usb_type_work);
2780
2781         return IRQ_HANDLED;
2782 }
2783
2784 /**
2785  * ab8500_charger_usblinkstatus_handler() - USB link status has changed
2786  * @irq:       interrupt number
2787  * @_di:       pointer to the ab8500_charger structure
2788  *
2789  * Returns IRQ status(IRQ_HANDLED)
2790  */
2791 static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
2792 {
2793         struct ab8500_charger *di = _di;
2794
2795         dev_dbg(di->dev, "USB link status changed\n");
2796
2797         queue_work(di->charger_wq, &di->usb_link_status_work);
2798
2799         return IRQ_HANDLED;
2800 }
2801
2802 /**
2803  * ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
2804  * thermal protection threshold
2805  * @irq:       interrupt number
2806  * @_di:       pointer to the ab8500_charger structure
2807  *
2808  * Returns IRQ status(IRQ_HANDLED)
2809  */
2810 static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
2811 {
2812         struct ab8500_charger *di = _di;
2813
2814         dev_dbg(di->dev,
2815                 "Die temp above USB charger thermal protection threshold\n");
2816         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2817
2818         return IRQ_HANDLED;
2819 }
2820
2821 /**
2822  * ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
2823  * thermal protection threshold
2824  * @irq:       interrupt number
2825  * @_di:       pointer to the ab8500_charger structure
2826  *
2827  * Returns IRQ status(IRQ_HANDLED)
2828  */
2829 static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
2830 {
2831         struct ab8500_charger *di = _di;
2832
2833         dev_dbg(di->dev,
2834                 "Die temp ok for USB charger thermal protection threshold\n");
2835         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2836
2837         return IRQ_HANDLED;
2838 }
2839
2840 /**
2841  * ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
2842  * @irq:       interrupt number
2843  * @_di:       pointer to the ab8500_charger structure
2844  *
2845  * Returns IRQ status(IRQ_HANDLED)
2846  */
2847 static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
2848 {
2849         struct ab8500_charger *di = _di;
2850
2851         dev_dbg(di->dev, "Not allowed USB charger detected\n");
2852         queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
2853
2854         return IRQ_HANDLED;
2855 }
2856
2857 /**
2858  * ab8500_charger_chwdexp_handler() - Charger watchdog expired
2859  * @irq:       interrupt number
2860  * @_di:       pointer to the ab8500_charger structure
2861  *
2862  * Returns IRQ status(IRQ_HANDLED)
2863  */
2864 static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
2865 {
2866         struct ab8500_charger *di = _di;
2867
2868         dev_dbg(di->dev, "Charger watchdog expired\n");
2869
2870         /*
2871          * The charger that was online when the watchdog expired
2872          * needs to be restarted for charging to start again
2873          */
2874         if (di->ac.charger_online) {
2875                 di->ac.wd_expired = true;
2876                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
2877         }
2878         if (di->usb.charger_online) {
2879                 di->usb.wd_expired = true;
2880                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2881         }
2882
2883         return IRQ_HANDLED;
2884 }
2885
2886 /**
2887  * ab8500_charger_vbuschdropend_handler() - VBUS drop removed
2888  * @irq:       interrupt number
2889  * @_di:       pointer to the ab8500_charger structure
2890  *
2891  * Returns IRQ status(IRQ_HANDLED)
2892  */
2893 static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
2894 {
2895         struct ab8500_charger *di = _di;
2896
2897         dev_dbg(di->dev, "VBUS charger drop ended\n");
2898         di->flags.vbus_drop_end = true;
2899
2900         /*
2901          * VBUS might have dropped due to bad connection.
2902          * Schedule a new input limit set to the value SW requests.
2903          */
2904         queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
2905                            round_jiffies(VBUS_IN_CURR_LIM_RETRY_SET_TIME * HZ));
2906
2907         return IRQ_HANDLED;
2908 }
2909
2910 /**
2911  * ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
2912  * @irq:       interrupt number
2913  * @_di:       pointer to the ab8500_charger structure
2914  *
2915  * Returns IRQ status(IRQ_HANDLED)
2916  */
2917 static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
2918 {
2919         struct ab8500_charger *di = _di;
2920
2921         dev_dbg(di->dev, "VBUS overvoltage detected\n");
2922         di->flags.vbus_ovv = true;
2923         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2924
2925         /* Schedule a new HW failure check */
2926         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2927
2928         return IRQ_HANDLED;
2929 }
2930
2931 /**
2932  * ab8500_charger_ac_get_property() - get the ac/mains properties
2933  * @psy:       pointer to the power_supply structure
2934  * @psp:       pointer to the power_supply_property structure
2935  * @val:       pointer to the power_supply_propval union
2936  *
2937  * This function gets called when an application tries to get the ac/mains
2938  * properties by reading the sysfs files.
2939  * AC/Mains properties are online, present and voltage.
2940  * online:     ac/mains charging is in progress or not
2941  * present:    presence of the ac/mains
2942  * voltage:    AC/Mains voltage
2943  * Returns error code in case of failure else 0(on success)
2944  */
2945 static int ab8500_charger_ac_get_property(struct power_supply *psy,
2946         enum power_supply_property psp,
2947         union power_supply_propval *val)
2948 {
2949         struct ab8500_charger *di;
2950         int ret;
2951
2952         di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
2953
2954         switch (psp) {
2955         case POWER_SUPPLY_PROP_HEALTH:
2956                 if (di->flags.mainextchnotok)
2957                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2958                 else if (di->ac.wd_expired || di->usb.wd_expired)
2959                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2960                 else if (di->flags.main_thermal_prot)
2961                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2962                 else
2963                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2964                 break;
2965         case POWER_SUPPLY_PROP_ONLINE:
2966                 val->intval = di->ac.charger_online;
2967                 break;
2968         case POWER_SUPPLY_PROP_PRESENT:
2969                 val->intval = di->ac.charger_connected;
2970                 break;
2971         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2972                 ret = ab8500_charger_get_ac_voltage(di);
2973                 if (ret >= 0)
2974                         di->ac.charger_voltage = ret;
2975                 /* On error, use previous value */
2976                 val->intval = di->ac.charger_voltage * 1000;
2977                 break;
2978         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2979                 /*
2980                  * This property is used to indicate when CV mode is entered
2981                  * for the AC charger
2982                  */
2983                 di->ac.cv_active = ab8500_charger_ac_cv(di);
2984                 val->intval = di->ac.cv_active;
2985                 break;
2986         case POWER_SUPPLY_PROP_CURRENT_NOW:
2987                 ret = ab8500_charger_get_ac_current(di);
2988                 if (ret >= 0)
2989                         di->ac.charger_current = ret;
2990                 val->intval = di->ac.charger_current * 1000;
2991                 break;
2992         default:
2993                 return -EINVAL;
2994         }
2995         return 0;
2996 }
2997
2998 /**
2999  * ab8500_charger_usb_get_property() - get the usb properties
3000  * @psy:        pointer to the power_supply structure
3001  * @psp:        pointer to the power_supply_property structure
3002  * @val:        pointer to the power_supply_propval union
3003  *
3004  * This function gets called when an application tries to get the usb
3005  * properties by reading the sysfs files.
3006  * USB properties are online, present and voltage.
3007  * online:     usb charging is in progress or not
3008  * present:    presence of the usb
3009  * voltage:    vbus voltage
3010  * Returns error code in case of failure else 0(on success)
3011  */
3012 static int ab8500_charger_usb_get_property(struct power_supply *psy,
3013         enum power_supply_property psp,
3014         union power_supply_propval *val)
3015 {
3016         struct ab8500_charger *di;
3017         int ret;
3018
3019         di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
3020
3021         switch (psp) {
3022         case POWER_SUPPLY_PROP_HEALTH:
3023                 if (di->flags.usbchargernotok)
3024                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
3025                 else if (di->ac.wd_expired || di->usb.wd_expired)
3026                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
3027                 else if (di->flags.usb_thermal_prot)
3028                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
3029                 else if (di->flags.vbus_ovv)
3030                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
3031                 else
3032                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
3033                 break;
3034         case POWER_SUPPLY_PROP_ONLINE:
3035                 val->intval = di->usb.charger_online;
3036                 break;
3037         case POWER_SUPPLY_PROP_PRESENT:
3038                 val->intval = di->usb.charger_connected;
3039                 break;
3040         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
3041                 ret = ab8500_charger_get_vbus_voltage(di);
3042                 if (ret >= 0)
3043                         di->usb.charger_voltage = ret;
3044                 val->intval = di->usb.charger_voltage * 1000;
3045                 break;
3046         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
3047                 /*
3048                  * This property is used to indicate when CV mode is entered
3049                  * for the USB charger
3050                  */
3051                 di->usb.cv_active = ab8500_charger_usb_cv(di);
3052                 val->intval = di->usb.cv_active;
3053                 break;
3054         case POWER_SUPPLY_PROP_CURRENT_NOW:
3055                 ret = ab8500_charger_get_usb_current(di);
3056                 if (ret >= 0)
3057                         di->usb.charger_current = ret;
3058                 val->intval = di->usb.charger_current * 1000;
3059                 break;
3060         case POWER_SUPPLY_PROP_CURRENT_AVG:
3061                 /*
3062                  * This property is used to indicate when VBUS has collapsed
3063                  * due to too high output current from the USB charger
3064                  */
3065                 if (di->flags.vbus_collapse)
3066                         val->intval = 1;
3067                 else
3068                         val->intval = 0;
3069                 break;
3070         default:
3071                 return -EINVAL;
3072         }
3073         return 0;
3074 }
3075
3076 /**
3077  * ab8500_charger_init_hw_registers() - Set up charger related registers
3078  * @di:         pointer to the ab8500_charger structure
3079  *
3080  * Set up charger OVV, watchdog and maximum voltage registers as well as
3081  * charging of the backup battery
3082  */
3083 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
3084 {
3085         int ret = 0;
3086         u8 bup_vch_range = 0, vbup33_vrtcn = 0;
3087
3088         /* Setup maximum charger current and voltage for ABB cut2.0 */
3089         if (!is_ab8500_1p1_or_earlier(di->parent)) {
3090                 ret = abx500_set_register_interruptible(di->dev,
3091                         AB8500_CHARGER,
3092                         AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
3093                 if (ret) {
3094                         dev_err(di->dev,
3095                                 "failed to set CH_VOLT_LVL_MAX_REG\n");
3096                         goto out;
3097                 }
3098
3099                 if (is_ab8540(di->parent))
3100                         ret = abx500_set_register_interruptible(di->dev,
3101                                 AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3102                                 CH_OP_CUR_LVL_2P);
3103                 else
3104                         ret = abx500_set_register_interruptible(di->dev,
3105                                 AB8500_CHARGER, AB8500_CH_OPT_CRNTLVL_MAX_REG,
3106                                 CH_OP_CUR_LVL_1P6);
3107                 if (ret) {
3108                         dev_err(di->dev,
3109                                 "failed to set CH_OPT_CRNTLVL_MAX_REG\n");
3110                         goto out;
3111                 }
3112         }
3113
3114         if (is_ab9540_2p0(di->parent) || is_ab9540_3p0(di->parent)
3115          || is_ab8505_2p0(di->parent) || is_ab8540(di->parent))
3116                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3117                         AB8500_CHARGER,
3118                         AB8500_USBCH_CTRL2_REG,
3119                         VBUS_AUTO_IN_CURR_LIM_ENA,
3120                         VBUS_AUTO_IN_CURR_LIM_ENA);
3121         else
3122                 /*
3123                  * VBUS OVV set to 6.3V and enable automatic current limitation
3124                  */
3125                 ret = abx500_set_register_interruptible(di->dev,
3126                         AB8500_CHARGER,
3127                         AB8500_USBCH_CTRL2_REG,
3128                         VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
3129         if (ret) {
3130                 dev_err(di->dev,
3131                         "failed to set automatic current limitation\n");
3132                 goto out;
3133         }
3134
3135         /* Enable main watchdog in OTP */
3136         ret = abx500_set_register_interruptible(di->dev,
3137                 AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
3138         if (ret) {
3139                 dev_err(di->dev, "failed to enable main WD in OTP\n");
3140                 goto out;
3141         }
3142
3143         /* Enable main watchdog */
3144         ret = abx500_set_register_interruptible(di->dev,
3145                 AB8500_SYS_CTRL2_BLOCK,
3146                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
3147         if (ret) {
3148                 dev_err(di->dev, "faile to enable main watchdog\n");
3149                 goto out;
3150         }
3151
3152         /*
3153          * Due to internal synchronisation, Enable and Kick watchdog bits
3154          * cannot be enabled in a single write.
3155          * A minimum delay of 2*32 kHz period (62.5µs) must be inserted
3156          * between writing Enable then Kick bits.
3157          */
3158         udelay(63);
3159
3160         /* Kick main watchdog */
3161         ret = abx500_set_register_interruptible(di->dev,
3162                 AB8500_SYS_CTRL2_BLOCK,
3163                 AB8500_MAIN_WDOG_CTRL_REG,
3164                 (MAIN_WDOG_ENA | MAIN_WDOG_KICK));
3165         if (ret) {
3166                 dev_err(di->dev, "failed to kick main watchdog\n");
3167                 goto out;
3168         }
3169
3170         /* Disable main watchdog */
3171         ret = abx500_set_register_interruptible(di->dev,
3172                 AB8500_SYS_CTRL2_BLOCK,
3173                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
3174         if (ret) {
3175                 dev_err(di->dev, "failed to disable main watchdog\n");
3176                 goto out;
3177         }
3178
3179         /* Set watchdog timeout */
3180         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3181                 AB8500_CH_WD_TIMER_REG, WD_TIMER);
3182         if (ret) {
3183                 dev_err(di->dev, "failed to set charger watchdog timeout\n");
3184                 goto out;
3185         }
3186
3187         ret = ab8500_charger_led_en(di, false);
3188         if (ret < 0) {
3189                 dev_err(di->dev, "failed to disable LED\n");
3190                 goto out;
3191         }
3192
3193         /* Backup battery voltage and current */
3194         if (di->bm->bkup_bat_v > BUP_VCH_SEL_3P1V)
3195                 bup_vch_range = BUP_VCH_RANGE;
3196         if (di->bm->bkup_bat_v == BUP_VCH_SEL_3P3V)
3197                 vbup33_vrtcn = VBUP33_VRTCN;
3198
3199         ret = abx500_set_register_interruptible(di->dev,
3200                 AB8500_RTC,
3201                 AB8500_RTC_BACKUP_CHG_REG,
3202                 (di->bm->bkup_bat_v & 0x3) | di->bm->bkup_bat_i);
3203         if (ret) {
3204                 dev_err(di->dev, "failed to setup backup battery charging\n");
3205                 goto out;
3206         }
3207         if (is_ab8540(di->parent)) {
3208                 ret = abx500_set_register_interruptible(di->dev,
3209                         AB8500_RTC,
3210                         AB8500_RTC_CTRL1_REG,
3211                         bup_vch_range | vbup33_vrtcn);
3212                 if (ret) {
3213                         dev_err(di->dev,
3214                                 "failed to setup backup battery charging\n");
3215                         goto out;
3216                 }
3217         }
3218
3219         /* Enable backup battery charging */
3220         abx500_mask_and_set_register_interruptible(di->dev,
3221                 AB8500_RTC, AB8500_RTC_CTRL_REG,
3222                 RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
3223         if (ret < 0)
3224                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3225
3226         if (is_ab8540(di->parent)) {
3227                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3228                         AB8500_CHARGER, AB8540_USB_PP_MODE_REG,
3229                         BUS_VSYS_VOL_SELECT_MASK, BUS_VSYS_VOL_SELECT_3P6V);
3230                 if (ret) {
3231                         dev_err(di->dev,
3232                                 "failed to setup usb power path vsys voltage\n");
3233                         goto out;
3234                 }
3235                 ret = abx500_mask_and_set_register_interruptible(di->dev,
3236                         AB8500_CHARGER, AB8540_USB_PP_CHR_REG,
3237                         BUS_PP_PRECHG_CURRENT_MASK, 0);
3238                 if (ret) {
3239                         dev_err(di->dev,
3240                                 "failed to setup usb power path prechage current\n");
3241                         goto out;
3242                 }
3243         }
3244
3245 out:
3246         return ret;
3247 }
3248
3249 /*
3250  * ab8500 charger driver interrupts and their respective isr
3251  */
3252 static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
3253         {"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
3254         {"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
3255         {"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
3256         {"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
3257         {"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
3258         {"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
3259         {"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
3260         {"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
3261         {"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
3262         {"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
3263         {"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
3264         {"VBUS_OVV", ab8500_charger_vbusovv_handler},
3265         {"CH_WD_EXP", ab8500_charger_chwdexp_handler},
3266         {"VBUS_CH_DROP_END", ab8500_charger_vbuschdropend_handler},
3267 };
3268
3269 static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
3270                 unsigned long event, void *power)
3271 {
3272         struct ab8500_charger *di =
3273                 container_of(nb, struct ab8500_charger, nb);
3274         enum ab8500_usb_state bm_usb_state;
3275         unsigned mA = *((unsigned *)power);
3276
3277         if (!di)
3278                 return NOTIFY_DONE;
3279
3280         if (event != USB_EVENT_VBUS) {
3281                 dev_dbg(di->dev, "not a standard host, returning\n");
3282                 return NOTIFY_DONE;
3283         }
3284
3285         /* TODO: State is fabricate  here. See if charger really needs USB
3286          * state or if mA is enough
3287          */
3288         if ((di->usb_state.usb_current == 2) && (mA > 2))
3289                 bm_usb_state = AB8500_BM_USB_STATE_RESUME;
3290         else if (mA == 0)
3291                 bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
3292         else if (mA == 2)
3293                 bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
3294         else if (mA >= 8) /* 8, 100, 500 */
3295                 bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
3296         else /* Should never occur */
3297                 bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
3298
3299         dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
3300                 __func__, bm_usb_state, mA);
3301
3302         spin_lock(&di->usb_state.usb_lock);
3303         di->usb_state.state_tmp = bm_usb_state;
3304         di->usb_state.usb_current_tmp = mA;
3305         spin_unlock(&di->usb_state.usb_lock);
3306
3307         /*
3308          * wait for some time until you get updates from the usb stack
3309          * and negotiations are completed
3310          */
3311         queue_delayed_work(di->charger_wq, &di->usb_state_changed_work, HZ/2);
3312
3313         return NOTIFY_OK;
3314 }
3315
3316 #if defined(CONFIG_PM)
3317 static int ab8500_charger_resume(struct platform_device *pdev)
3318 {
3319         int ret;
3320         struct ab8500_charger *di = platform_get_drvdata(pdev);
3321
3322         /*
3323          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3324          * logic. That means we have to continously kick the charger
3325          * watchdog even when no charger is connected. This is only
3326          * valid once the AC charger has been enabled. This is
3327          * a bug that is not handled by the algorithm and the
3328          * watchdog have to be kicked by the charger driver
3329          * when the AC charger is disabled
3330          */
3331         if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
3332                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
3333                         AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
3334                 if (ret)
3335                         dev_err(di->dev, "Failed to kick WD!\n");
3336
3337                 /* If not already pending start a new timer */
3338                 queue_delayed_work(di->charger_wq, &di->kick_wd_work,
3339                                    round_jiffies(WD_KICK_INTERVAL));
3340         }
3341
3342         /* If we still have a HW failure, schedule a new check */
3343         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
3344                 queue_delayed_work(di->charger_wq,
3345                         &di->check_hw_failure_work, 0);
3346         }
3347
3348         if (di->flags.vbus_drop_end)
3349                 queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work, 0);
3350
3351         return 0;
3352 }
3353
3354 static int ab8500_charger_suspend(struct platform_device *pdev,
3355         pm_message_t state)
3356 {
3357         struct ab8500_charger *di = platform_get_drvdata(pdev);
3358
3359         /* Cancel any pending jobs */
3360         cancel_delayed_work(&di->check_hw_failure_work);
3361         cancel_delayed_work(&di->vbus_drop_end_work);
3362
3363         flush_delayed_work(&di->attach_work);
3364         flush_delayed_work(&di->usb_charger_attached_work);
3365         flush_delayed_work(&di->ac_charger_attached_work);
3366         flush_delayed_work(&di->check_usbchgnotok_work);
3367         flush_delayed_work(&di->check_vbat_work);
3368         flush_delayed_work(&di->kick_wd_work);
3369
3370         flush_work(&di->usb_link_status_work);
3371         flush_work(&di->ac_work);
3372         flush_work(&di->detect_usb_type_work);
3373
3374         if (atomic_read(&di->current_stepping_sessions))
3375                 return -EAGAIN;
3376
3377         return 0;
3378 }
3379 #else
3380 #define ab8500_charger_suspend      NULL
3381 #define ab8500_charger_resume       NULL
3382 #endif
3383
3384 static struct notifier_block charger_nb = {
3385         .notifier_call = ab8500_external_charger_prepare,
3386 };
3387
3388 static int ab8500_charger_remove(struct platform_device *pdev)
3389 {
3390         struct ab8500_charger *di = platform_get_drvdata(pdev);
3391         int i, irq, ret;
3392
3393         /* Disable AC charging */
3394         ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
3395
3396         /* Disable USB charging */
3397         ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
3398
3399         /* Disable interrupts */
3400         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3401                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3402                 free_irq(irq, di);
3403         }
3404
3405         /* Backup battery voltage and current disable */
3406         ret = abx500_mask_and_set_register_interruptible(di->dev,
3407                 AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
3408         if (ret < 0)
3409                 dev_err(di->dev, "%s mask and set failed\n", __func__);
3410
3411         usb_unregister_notifier(di->usb_phy, &di->nb);
3412         usb_put_phy(di->usb_phy);
3413
3414         /* Delete the work queue */
3415         destroy_workqueue(di->charger_wq);
3416
3417         /* Unregister external charger enable notifier */
3418         if (!di->ac_chg.enabled)
3419                 blocking_notifier_chain_unregister(
3420                         &charger_notifier_list, &charger_nb);
3421
3422         flush_scheduled_work();
3423         if (di->usb_chg.enabled)
3424                 power_supply_unregister(&di->usb_chg.psy);
3425
3426         if (di->ac_chg.enabled && !di->ac_chg.external)
3427                 power_supply_unregister(&di->ac_chg.psy);
3428
3429         return 0;
3430 }
3431
3432 static char *supply_interface[] = {
3433         "ab8500_chargalg",
3434         "ab8500_fg",
3435         "ab8500_btemp",
3436 };
3437
3438 static int ab8500_charger_probe(struct platform_device *pdev)
3439 {
3440         struct device_node *np = pdev->dev.of_node;
3441         struct abx500_bm_data *plat = pdev->dev.platform_data;
3442         struct ab8500_charger *di;
3443         int irq, i, charger_status, ret = 0, ch_stat;
3444
3445         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
3446         if (!di) {
3447                 dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
3448                 return -ENOMEM;
3449         }
3450
3451         if (!plat) {
3452                 dev_err(&pdev->dev, "no battery management data supplied\n");
3453                 return -EINVAL;
3454         }
3455         di->bm = plat;
3456
3457         if (np) {
3458                 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
3459                 if (ret) {
3460                         dev_err(&pdev->dev, "failed to get battery information\n");
3461                         return ret;
3462                 }
3463                 di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
3464         } else
3465                 di->autopower_cfg = false;
3466
3467         /* get parent data */
3468         di->dev = &pdev->dev;
3469         di->parent = dev_get_drvdata(pdev->dev.parent);
3470         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
3471
3472         /* initialize lock */
3473         spin_lock_init(&di->usb_state.usb_lock);
3474         mutex_init(&di->usb_ipt_crnt_lock);
3475
3476         di->autopower = false;
3477         di->invalid_charger_detect_state = 0;
3478
3479         /* AC supply */
3480         /* power_supply base class */
3481         di->ac_chg.psy.name = "ab8500_ac";
3482         di->ac_chg.psy.type = POWER_SUPPLY_TYPE_MAINS;
3483         di->ac_chg.psy.properties = ab8500_charger_ac_props;
3484         di->ac_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_ac_props);
3485         di->ac_chg.psy.get_property = ab8500_charger_ac_get_property;
3486         di->ac_chg.psy.supplied_to = supply_interface;
3487         di->ac_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
3488         /* ux500_charger sub-class */
3489         di->ac_chg.ops.enable = &ab8500_charger_ac_en;
3490         di->ac_chg.ops.check_enable = &ab8500_charger_ac_check_enable;
3491         di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3492         di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3493         di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
3494                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3495         di->ac_chg.max_out_curr =
3496                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3497         di->ac_chg.wdt_refresh = CHG_WD_INTERVAL;
3498         di->ac_chg.enabled = di->bm->ac_enabled;
3499         di->ac_chg.external = false;
3500
3501         /*notifier for external charger enabling*/
3502         if (!di->ac_chg.enabled)
3503                 blocking_notifier_chain_register(
3504                         &charger_notifier_list, &charger_nb);
3505
3506         /* USB supply */
3507         /* power_supply base class */
3508         di->usb_chg.psy.name = "ab8500_usb";
3509         di->usb_chg.psy.type = POWER_SUPPLY_TYPE_USB;
3510         di->usb_chg.psy.properties = ab8500_charger_usb_props;
3511         di->usb_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_usb_props);
3512         di->usb_chg.psy.get_property = ab8500_charger_usb_get_property;
3513         di->usb_chg.psy.supplied_to = supply_interface;
3514         di->usb_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
3515         /* ux500_charger sub-class */
3516         di->usb_chg.ops.enable = &ab8500_charger_usb_en;
3517         di->usb_chg.ops.check_enable = &ab8500_charger_usb_check_enable;
3518         di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
3519         di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
3520         di->usb_chg.ops.pp_enable = &ab8540_charger_power_path_enable;
3521         di->usb_chg.ops.pre_chg_enable = &ab8540_charger_usb_pre_chg_enable;
3522         di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
3523                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
3524         di->usb_chg.max_out_curr =
3525                 di->bm->chg_output_curr[di->bm->n_chg_out_curr - 1];
3526         di->usb_chg.wdt_refresh = CHG_WD_INTERVAL;
3527         di->usb_chg.enabled = di->bm->usb_enabled;
3528         di->usb_chg.external = false;
3529         di->usb_chg.power_path = di->bm->usb_power_path;
3530         di->usb_state.usb_current = -1;
3531
3532         /* Create a work queue for the charger */
3533         di->charger_wq =
3534                 create_singlethread_workqueue("ab8500_charger_wq");
3535         if (di->charger_wq == NULL) {
3536                 dev_err(di->dev, "failed to create work queue\n");
3537                 return -ENOMEM;
3538         }
3539
3540         mutex_init(&di->charger_attached_mutex);
3541
3542         /* Init work for HW failure check */
3543         INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
3544                 ab8500_charger_check_hw_failure_work);
3545         INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
3546                 ab8500_charger_check_usbchargernotok_work);
3547
3548         INIT_DELAYED_WORK(&di->ac_charger_attached_work,
3549                           ab8500_charger_ac_attached_work);
3550         INIT_DELAYED_WORK(&di->usb_charger_attached_work,
3551                           ab8500_charger_usb_attached_work);
3552
3553         /*
3554          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
3555          * logic. That means we have to continously kick the charger
3556          * watchdog even when no charger is connected. This is only
3557          * valid once the AC charger has been enabled. This is
3558          * a bug that is not handled by the algorithm and the
3559          * watchdog have to be kicked by the charger driver
3560          * when the AC charger is disabled
3561          */
3562         INIT_DEFERRABLE_WORK(&di->kick_wd_work,
3563                 ab8500_charger_kick_watchdog_work);
3564
3565         INIT_DEFERRABLE_WORK(&di->check_vbat_work,
3566                 ab8500_charger_check_vbat_work);
3567
3568         INIT_DELAYED_WORK(&di->attach_work,
3569                 ab8500_charger_usb_link_attach_work);
3570
3571         INIT_DELAYED_WORK(&di->usb_state_changed_work,
3572                 ab8500_charger_usb_state_changed_work);
3573
3574         INIT_DELAYED_WORK(&di->vbus_drop_end_work,
3575                 ab8500_charger_vbus_drop_end_work);
3576
3577         /* Init work for charger detection */
3578         INIT_WORK(&di->usb_link_status_work,
3579                 ab8500_charger_usb_link_status_work);
3580         INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
3581         INIT_WORK(&di->detect_usb_type_work,
3582                 ab8500_charger_detect_usb_type_work);
3583
3584         /* Init work for checking HW status */
3585         INIT_WORK(&di->check_main_thermal_prot_work,
3586                 ab8500_charger_check_main_thermal_prot_work);
3587         INIT_WORK(&di->check_usb_thermal_prot_work,
3588                 ab8500_charger_check_usb_thermal_prot_work);
3589
3590         /*
3591          * VDD ADC supply needs to be enabled from this driver when there
3592          * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
3593          * interrupts during charging
3594          */
3595         di->regu = devm_regulator_get(di->dev, "vddadc");
3596         if (IS_ERR(di->regu)) {
3597                 ret = PTR_ERR(di->regu);
3598                 dev_err(di->dev, "failed to get vddadc regulator\n");
3599                 goto free_charger_wq;
3600         }
3601
3602
3603         /* Initialize OVV, and other registers */
3604         ret = ab8500_charger_init_hw_registers(di);
3605         if (ret) {
3606                 dev_err(di->dev, "failed to initialize ABB registers\n");
3607                 goto free_charger_wq;
3608         }
3609
3610         /* Register AC charger class */
3611         if (di->ac_chg.enabled) {
3612                 ret = power_supply_register(di->dev, &di->ac_chg.psy);
3613                 if (ret) {
3614                         dev_err(di->dev, "failed to register AC charger\n");
3615                         goto free_charger_wq;
3616                 }
3617         }
3618
3619         /* Register USB charger class */
3620         if (di->usb_chg.enabled) {
3621                 ret = power_supply_register(di->dev, &di->usb_chg.psy);
3622                 if (ret) {
3623                         dev_err(di->dev, "failed to register USB charger\n");
3624                         goto free_ac;
3625                 }
3626         }
3627
3628         di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
3629         if (IS_ERR_OR_NULL(di->usb_phy)) {
3630                 dev_err(di->dev, "failed to get usb transceiver\n");
3631                 ret = -EINVAL;
3632                 goto free_usb;
3633         }
3634         di->nb.notifier_call = ab8500_charger_usb_notifier_call;
3635         ret = usb_register_notifier(di->usb_phy, &di->nb);
3636         if (ret) {
3637                 dev_err(di->dev, "failed to register usb notifier\n");
3638                 goto put_usb_phy;
3639         }
3640
3641         /* Identify the connected charger types during startup */
3642         charger_status = ab8500_charger_detect_chargers(di, true);
3643         if (charger_status & AC_PW_CONN) {
3644                 di->ac.charger_connected = 1;
3645                 di->ac_conn = true;
3646                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
3647                 sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
3648         }
3649
3650         if (charger_status & USB_PW_CONN) {
3651                 di->vbus_detected = true;
3652                 di->vbus_detected_start = true;
3653                 queue_work(di->charger_wq,
3654                         &di->detect_usb_type_work);
3655         }
3656
3657         /* Register interrupts */
3658         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
3659                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3660                 ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
3661                         IRQF_SHARED | IRQF_NO_SUSPEND,
3662                         ab8500_charger_irq[i].name, di);
3663
3664                 if (ret != 0) {
3665                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
3666                                 , ab8500_charger_irq[i].name, irq, ret);
3667                         goto free_irq;
3668                 }
3669                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
3670                         ab8500_charger_irq[i].name, irq, ret);
3671         }
3672
3673         platform_set_drvdata(pdev, di);
3674
3675         mutex_lock(&di->charger_attached_mutex);
3676
3677         ch_stat = ab8500_charger_detect_chargers(di, false);
3678
3679         if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) {
3680                 if (is_ab8500(di->parent))
3681                         queue_delayed_work(di->charger_wq,
3682                                            &di->ac_charger_attached_work,
3683                                            HZ);
3684         }
3685         if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) {
3686                 if (is_ab8500(di->parent))
3687                         queue_delayed_work(di->charger_wq,
3688                                            &di->usb_charger_attached_work,
3689                                            HZ);
3690         }
3691
3692         mutex_unlock(&di->charger_attached_mutex);
3693
3694         return ret;
3695
3696 free_irq:
3697         usb_unregister_notifier(di->usb_phy, &di->nb);
3698
3699         /* We also have to free all successfully registered irqs */
3700         for (i = i - 1; i >= 0; i--) {
3701                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
3702                 free_irq(irq, di);
3703         }
3704 put_usb_phy:
3705         usb_put_phy(di->usb_phy);
3706 free_usb:
3707         if (di->usb_chg.enabled)
3708                 power_supply_unregister(&di->usb_chg.psy);
3709 free_ac:
3710         if (di->ac_chg.enabled)
3711                 power_supply_unregister(&di->ac_chg.psy);
3712 free_charger_wq:
3713         destroy_workqueue(di->charger_wq);
3714         return ret;
3715 }
3716
3717 static const struct of_device_id ab8500_charger_match[] = {
3718         { .compatible = "stericsson,ab8500-charger", },
3719         { },
3720 };
3721
3722 static struct platform_driver ab8500_charger_driver = {
3723         .probe = ab8500_charger_probe,
3724         .remove = ab8500_charger_remove,
3725         .suspend = ab8500_charger_suspend,
3726         .resume = ab8500_charger_resume,
3727         .driver = {
3728                 .name = "ab8500-charger",
3729                 .owner = THIS_MODULE,
3730                 .of_match_table = ab8500_charger_match,
3731         },
3732 };
3733
3734 static int __init ab8500_charger_init(void)
3735 {
3736         return platform_driver_register(&ab8500_charger_driver);
3737 }
3738
3739 static void __exit ab8500_charger_exit(void)
3740 {
3741         platform_driver_unregister(&ab8500_charger_driver);
3742 }
3743
3744 subsys_initcall_sync(ab8500_charger_init);
3745 module_exit(ab8500_charger_exit);
3746
3747 MODULE_LICENSE("GPL v2");
3748 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
3749 MODULE_ALIAS("platform:ab8500-charger");
3750 MODULE_DESCRIPTION("AB8500 charger management driver");