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/slab.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/power_supply.h>
  21 #include <linux/completion.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/err.h>
  24 #include <linux/workqueue.h>
  25 #include <linux/kobject.h>
  26 #include <linux/of.h>
  27 #include <linux/mfd/core.h>
  28 #include <linux/mfd/abx500/ab8500.h>
  29 #include <linux/mfd/abx500.h>
  30 #include <linux/mfd/abx500/ab8500-bm.h>
  31 #include <linux/mfd/abx500/ab8500-gpadc.h>
  32 #include <linux/mfd/abx500/ux500_chargalg.h>
  33 #include <linux/usb/otg.h>
  34
  35 /* Charger constants */
  36 #define NO_PW_CONN                      0
  37 #define AC_PW_CONN                      1
  38 #define USB_PW_CONN                     2
  39
  40 #define MAIN_WDOG_ENA                   0x01
  41 #define MAIN_WDOG_KICK                  0x02
  42 #define MAIN_WDOG_DIS                   0x00
  43 #define CHARG_WD_KICK                   0x01
  44 #define MAIN_CH_ENA                     0x01
  45 #define MAIN_CH_NO_OVERSHOOT_ENA_N      0x02
  46 #define USB_CH_ENA                      0x01
  47 #define USB_CHG_NO_OVERSHOOT_ENA_N      0x02
  48 #define MAIN_CH_DET                     0x01
  49 #define MAIN_CH_CV_ON                   0x04
  50 #define USB_CH_CV_ON                    0x08
  51 #define VBUS_DET_DBNC100                0x02
  52 #define VBUS_DET_DBNC1                  0x01
  53 #define OTP_ENABLE_WD                   0x01
  54
  55 #define MAIN_CH_INPUT_CURR_SHIFT        4
  56 #define VBUS_IN_CURR_LIM_SHIFT          4
  57
  58 #define LED_INDICATOR_PWM_ENA           0x01
  59 #define LED_INDICATOR_PWM_DIS           0x00
  60 #define LED_IND_CUR_5MA                 0x04
  61 #define LED_INDICATOR_PWM_DUTY_252_256  0xBF
  62
  63 /* HW failure constants */
  64 #define MAIN_CH_TH_PROT                 0x02
  65 #define VBUS_CH_NOK                     0x08
  66 #define USB_CH_TH_PROT                  0x02
  67 #define VBUS_OVV_TH                     0x01
  68 #define MAIN_CH_NOK                     0x01
  69 #define VBUS_DET                        0x80
  70
  71 /* UsbLineStatus register bit masks */
  72 #define AB8500_USB_LINK_STATUS          0x78
  73 #define AB8500_STD_HOST_SUSP            0x18
  74
  75 /* Watchdog timeout constant */
  76 #define WD_TIMER                        0x30 /* 4min */
  77 #define WD_KICK_INTERVAL                (60 * HZ)
  78
  79 /* Lowest charger voltage is 3.39V -> 0x4E */
  80 #define LOW_VOLT_REG                    0x4E
  81
  82 /* Step up/down delay in us */
  83 #define STEP_UDELAY                     1000
  84
  85 /* UsbLineStatus register - usb types */
  86 enum ab8500_charger_link_status {
  87         USB_STAT_NOT_CONFIGURED,
  88         USB_STAT_STD_HOST_NC,
  89         USB_STAT_STD_HOST_C_NS,
  90         USB_STAT_STD_HOST_C_S,
  91         USB_STAT_HOST_CHG_NM,
  92         USB_STAT_HOST_CHG_HS,
  93         USB_STAT_HOST_CHG_HS_CHIRP,
  94         USB_STAT_DEDICATED_CHG,
  95         USB_STAT_ACA_RID_A,
  96         USB_STAT_ACA_RID_B,
  97         USB_STAT_ACA_RID_C_NM,
  98         USB_STAT_ACA_RID_C_HS,
  99         USB_STAT_ACA_RID_C_HS_CHIRP,
 100         USB_STAT_HM_IDGND,
 101         USB_STAT_RESERVED,
 102         USB_STAT_NOT_VALID_LINK,
 103 };
 104
 105 enum ab8500_usb_state {
 106         AB8500_BM_USB_STATE_RESET_HS,   /* HighSpeed Reset */
 107         AB8500_BM_USB_STATE_RESET_FS,   /* FullSpeed/LowSpeed Reset */
 108         AB8500_BM_USB_STATE_CONFIGURED,
 109         AB8500_BM_USB_STATE_SUSPEND,
 110         AB8500_BM_USB_STATE_RESUME,
 111         AB8500_BM_USB_STATE_MAX,
 112 };
 113
 114 /* VBUS input current limits supported in AB8500 in mA */
 115 #define USB_CH_IP_CUR_LVL_0P05          50
 116 #define USB_CH_IP_CUR_LVL_0P09          98
 117 #define USB_CH_IP_CUR_LVL_0P19          193
 118 #define USB_CH_IP_CUR_LVL_0P29          290
 119 #define USB_CH_IP_CUR_LVL_0P38          380
 120 #define USB_CH_IP_CUR_LVL_0P45          450
 121 #define USB_CH_IP_CUR_LVL_0P5           500
 122 #define USB_CH_IP_CUR_LVL_0P6           600
 123 #define USB_CH_IP_CUR_LVL_0P7           700
 124 #define USB_CH_IP_CUR_LVL_0P8           800
 125 #define USB_CH_IP_CUR_LVL_0P9           900
 126 #define USB_CH_IP_CUR_LVL_1P0           1000
 127 #define USB_CH_IP_CUR_LVL_1P1           1100
 128 #define USB_CH_IP_CUR_LVL_1P3           1300
 129 #define USB_CH_IP_CUR_LVL_1P4           1400
 130 #define USB_CH_IP_CUR_LVL_1P5           1500
 131
 132 #define VBAT_TRESH_IP_CUR_RED           3800
 133
 134 #define to_ab8500_charger_usb_device_info(x) container_of((x), \
 135         struct ab8500_charger, usb_chg)
 136 #define to_ab8500_charger_ac_device_info(x) container_of((x), \
 137         struct ab8500_charger, ac_chg)
 138
 139 /**
 140  * struct ab8500_charger_interrupts - ab8500 interupts
 141  * @name:       name of the interrupt
 142  * @isr         function pointer to the isr
 143  */
 144 struct ab8500_charger_interrupts {
 145         char *name;
 146         irqreturn_t (*isr)(int irq, void *data);
 147 };
 148
 149 struct ab8500_charger_info {
 150         int charger_connected;
 151         int charger_online;
 152         int charger_voltage;
 153         int cv_active;
 154         bool wd_expired;
 155 };
 156
 157 struct ab8500_charger_event_flags {
 158         bool mainextchnotok;
 159         bool main_thermal_prot;
 160         bool usb_thermal_prot;
 161         bool vbus_ovv;
 162         bool usbchargernotok;
 163         bool chgwdexp;
 164         bool vbus_collapse;
 165 };
 166
 167 struct ab8500_charger_usb_state {
 168         bool usb_changed;
 169         int usb_current;
 170         enum ab8500_usb_state state;
 171         spinlock_t usb_lock;
 172 };
 173
 174 /**
 175  * struct ab8500_charger - ab8500 Charger device information
 176  * @dev:                Pointer to the structure device
 177  * @max_usb_in_curr:    Max USB charger input current
 178  * @vbus_detected:      VBUS detected
 179  * @vbus_detected_start:
 180  *                      VBUS detected during startup
 181  * @ac_conn:            This will be true when the AC charger has been plugged
 182  * @vddadc_en_ac:       Indicate if VDD ADC supply is enabled because AC
 183  *                      charger is enabled
 184  * @vddadc_en_usb:      Indicate if VDD ADC supply is enabled because USB
 185  *                      charger is enabled
 186  * @vbat                Battery voltage
 187  * @old_vbat            Previously measured battery voltage
 188  * @autopower           Indicate if we should have automatic pwron after pwrloss
 189  * @autopower_cfg       platform specific power config support for "pwron after pwrloss"
 190  * @parent:             Pointer to the struct ab8500
 191  * @gpadc:              Pointer to the struct gpadc
 192  * @bm:                 Platform specific battery management information
 193  * @flags:              Structure for information about events triggered
 194  * @usb_state:          Structure for usb stack information
 195  * @ac_chg:             AC charger power supply
 196  * @usb_chg:            USB charger power supply
 197  * @ac:                 Structure that holds the AC charger properties
 198  * @usb:                Structure that holds the USB charger properties
 199  * @regu:               Pointer to the struct regulator
 200  * @charger_wq:         Work queue for the IRQs and checking HW state
 201  * @check_vbat_work     Work for checking vbat threshold to adjust vbus current
 202  * @check_hw_failure_work:      Work for checking HW state
 203  * @check_usbchgnotok_work:     Work for checking USB charger not ok status
 204  * @kick_wd_work:               Work for kicking the charger watchdog in case
 205  *                              of ABB rev 1.* due to the watchog logic bug
 206  * @ac_work:                    Work for checking AC charger connection
 207  * @detect_usb_type_work:       Work for detecting the USB type connected
 208  * @usb_link_status_work:       Work for checking the new USB link status
 209  * @usb_state_changed_work:     Work for checking USB state
 210  * @check_main_thermal_prot_work:
 211  *                              Work for checking Main thermal status
 212  * @check_usb_thermal_prot_work:
 213  *                              Work for checking USB thermal status
 214  */
 215 struct ab8500_charger {
 216         struct device *dev;
 217         int max_usb_in_curr;
 218         bool vbus_detected;
 219         bool vbus_detected_start;
 220         bool ac_conn;
 221         bool vddadc_en_ac;
 222         bool vddadc_en_usb;
 223         int vbat;
 224         int old_vbat;
 225         bool autopower;
 226         bool autopower_cfg;
 227         struct ab8500 *parent;
 228         struct ab8500_gpadc *gpadc;
 229         struct abx500_bm_data *bm;
 230         struct ab8500_charger_event_flags flags;
 231         struct ab8500_charger_usb_state usb_state;
 232         struct ux500_charger ac_chg;
 233         struct ux500_charger usb_chg;
 234         struct ab8500_charger_info ac;
 235         struct ab8500_charger_info usb;
 236         struct regulator *regu;
 237         struct workqueue_struct *charger_wq;
 238         struct delayed_work check_vbat_work;
 239         struct delayed_work check_hw_failure_work;
 240         struct delayed_work check_usbchgnotok_work;
 241         struct delayed_work kick_wd_work;
 242         struct work_struct ac_work;
 243         struct work_struct detect_usb_type_work;
 244         struct work_struct usb_link_status_work;
 245         struct work_struct usb_state_changed_work;
 246         struct work_struct check_main_thermal_prot_work;
 247         struct work_struct check_usb_thermal_prot_work;
 248         struct usb_phy *usb_phy;
 249         struct notifier_block nb;
 250 };
 251
 252 /* AC properties */
 253 static enum power_supply_property ab8500_charger_ac_props[] = {
 254         POWER_SUPPLY_PROP_HEALTH,
 255         POWER_SUPPLY_PROP_PRESENT,
 256         POWER_SUPPLY_PROP_ONLINE,
 257         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 258         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 259         POWER_SUPPLY_PROP_CURRENT_NOW,
 260 };
 261
 262 /* USB properties */
 263 static enum power_supply_property ab8500_charger_usb_props[] = {
 264         POWER_SUPPLY_PROP_HEALTH,
 265         POWER_SUPPLY_PROP_CURRENT_AVG,
 266         POWER_SUPPLY_PROP_PRESENT,
 267         POWER_SUPPLY_PROP_ONLINE,
 268         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 269         POWER_SUPPLY_PROP_VOLTAGE_AVG,
 270         POWER_SUPPLY_PROP_CURRENT_NOW,
 271 };
 272
 273 /*
 274  * Function for enabling and disabling sw fallback mode
 275  * should always be disabled when no charger is connected.
 276  */
 277 static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
 278                 bool fallback)
 279 {
 280         u8 reg;
 281         int ret;
 282
 283         dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
 284
 285         /* read the register containing fallback bit */
 286         ret = abx500_get_register_interruptible(di->dev, 0x15, 0x00, &reg);
 287         if (ret) {
 288                 dev_err(di->dev, "%d write failed\n", __LINE__);
 289                 return;
 290         }
 291
 292         /* enable the OPT emulation registers */
 293         ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
 294         if (ret) {
 295                 dev_err(di->dev, "%d write failed\n", __LINE__);
 296                 return;
 297         }
 298
 299         if (fallback)
 300                 reg |= 0x8;
 301         else
 302                 reg &= ~0x8;
 303
 304         /* write back the changed fallback bit value to register */
 305         ret = abx500_set_register_interruptible(di->dev, 0x15, 0x00, reg);
 306         if (ret) {
 307                 dev_err(di->dev, "%d write failed\n", __LINE__);
 308                 return;
 309         }
 310
 311         /* disable the set OTP registers again */
 312         ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
 313         if (ret) {
 314                 dev_err(di->dev, "%d write failed\n", __LINE__);
 315                 return;
 316         }
 317 }
 318
 319 /**
 320  * ab8500_power_supply_changed - a wrapper with local extentions for
 321  * power_supply_changed
 322  * @di:   pointer to the ab8500_charger structure
 323  * @psy:  pointer to power_supply_that have changed.
 324  *
 325  */
 326 static void ab8500_power_supply_changed(struct ab8500_charger *di,
 327                                         struct power_supply *psy)
 328 {
 329         if (di->autopower_cfg) {
 330                 if (!di->usb.charger_connected &&
 331                     !di->ac.charger_connected &&
 332                     di->autopower) {
 333                         di->autopower = false;
 334                         ab8500_enable_disable_sw_fallback(di, false);
 335                 } else if (!di->autopower &&
 336                            (di->ac.charger_connected ||
 337                             di->usb.charger_connected)) {
 338                         di->autopower = true;
 339                         ab8500_enable_disable_sw_fallback(di, true);
 340                 }
 341         }
 342         power_supply_changed(psy);
 343 }
 344
 345 static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
 346         bool connected)
 347 {
 348         if (connected != di->usb.charger_connected) {
 349                 dev_dbg(di->dev, "USB connected:%i\n", connected);
 350                 di->usb.charger_connected = connected;
 351                 sysfs_notify(&di->usb_chg.psy.dev->kobj, NULL, "present");
 352         }
 353 }
 354
 355 /**
 356  * ab8500_charger_get_ac_voltage() - get ac charger voltage
 357  * @di:         pointer to the ab8500_charger structure
 358  *
 359  * Returns ac charger voltage (on success)
 360  */
 361 static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
 362 {
 363         int vch;
 364
 365         /* Only measure voltage if the charger is connected */
 366         if (di->ac.charger_connected) {
 367                 vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
 368                 if (vch < 0)
 369                         dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
 370         } else {
 371                 vch = 0;
 372         }
 373         return vch;
 374 }
 375
 376 /**
 377  * ab8500_charger_ac_cv() - check if the main charger is in CV mode
 378  * @di:         pointer to the ab8500_charger structure
 379  *
 380  * Returns ac charger CV mode (on success) else error code
 381  */
 382 static int ab8500_charger_ac_cv(struct ab8500_charger *di)
 383 {
 384         u8 val;
 385         int ret = 0;
 386
 387         /* Only check CV mode if the charger is online */
 388         if (di->ac.charger_online) {
 389                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 390                         AB8500_CH_STATUS1_REG, &val);
 391                 if (ret < 0) {
 392                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 393                         return 0;
 394                 }
 395
 396                 if (val & MAIN_CH_CV_ON)
 397                         ret = 1;
 398                 else
 399                         ret = 0;
 400         }
 401
 402         return ret;
 403 }
 404
 405 /**
 406  * ab8500_charger_get_vbus_voltage() - get vbus voltage
 407  * @di:         pointer to the ab8500_charger structure
 408  *
 409  * This function returns the vbus voltage.
 410  * Returns vbus voltage (on success)
 411  */
 412 static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
 413 {
 414         int vch;
 415
 416         /* Only measure voltage if the charger is connected */
 417         if (di->usb.charger_connected) {
 418                 vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
 419                 if (vch < 0)
 420                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 421         } else {
 422                 vch = 0;
 423         }
 424         return vch;
 425 }
 426
 427 /**
 428  * ab8500_charger_get_usb_current() - get usb charger current
 429  * @di:         pointer to the ab8500_charger structure
 430  *
 431  * This function returns the usb charger current.
 432  * Returns usb current (on success) and error code on failure
 433  */
 434 static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
 435 {
 436         int ich;
 437
 438         /* Only measure current if the charger is online */
 439         if (di->usb.charger_online) {
 440                 ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
 441                 if (ich < 0)
 442                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 443         } else {
 444                 ich = 0;
 445         }
 446         return ich;
 447 }
 448
 449 /**
 450  * ab8500_charger_get_ac_current() - get ac charger current
 451  * @di:         pointer to the ab8500_charger structure
 452  *
 453  * This function returns the ac charger current.
 454  * Returns ac current (on success) and error code on failure.
 455  */
 456 static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
 457 {
 458         int ich;
 459
 460         /* Only measure current if the charger is online */
 461         if (di->ac.charger_online) {
 462                 ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
 463                 if (ich < 0)
 464                         dev_err(di->dev, "%s gpadc conv failed\n", __func__);
 465         } else {
 466                 ich = 0;
 467         }
 468         return ich;
 469 }
 470
 471 /**
 472  * ab8500_charger_usb_cv() - check if the usb charger is in CV mode
 473  * @di:         pointer to the ab8500_charger structure
 474  *
 475  * Returns ac charger CV mode (on success) else error code
 476  */
 477 static int ab8500_charger_usb_cv(struct ab8500_charger *di)
 478 {
 479         int ret;
 480         u8 val;
 481
 482         /* Only check CV mode if the charger is online */
 483         if (di->usb.charger_online) {
 484                 ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 485                         AB8500_CH_USBCH_STAT1_REG, &val);
 486                 if (ret < 0) {
 487                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 488                         return 0;
 489                 }
 490
 491                 if (val & USB_CH_CV_ON)
 492                         ret = 1;
 493                 else
 494                         ret = 0;
 495         } else {
 496                 ret = 0;
 497         }
 498
 499         return ret;
 500 }
 501
 502 /**
 503  * ab8500_charger_detect_chargers() - Detect the connected chargers
 504  * @di:         pointer to the ab8500_charger structure
 505  *
 506  * Returns the type of charger connected.
 507  * For USB it will not mean we can actually charge from it
 508  * but that there is a USB cable connected that we have to
 509  * identify. This is used during startup when we don't get
 510  * interrupts of the charger detection
 511  *
 512  * Returns an integer value, that means,
 513  * NO_PW_CONN  no power supply is connected
 514  * AC_PW_CONN  if the AC power supply is connected
 515  * USB_PW_CONN  if the USB power supply is connected
 516  * AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
 517  */
 518 static int ab8500_charger_detect_chargers(struct ab8500_charger *di)
 519 {
 520         int result = NO_PW_CONN;
 521         int ret;
 522         u8 val;
 523
 524         /* Check for AC charger */
 525         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 526                 AB8500_CH_STATUS1_REG, &val);
 527         if (ret < 0) {
 528                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 529                 return ret;
 530         }
 531
 532         if (val & MAIN_CH_DET)
 533                 result = AC_PW_CONN;
 534
 535         /* Check for USB charger */
 536         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 537                 AB8500_CH_USBCH_STAT1_REG, &val);
 538         if (ret < 0) {
 539                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 540                 return ret;
 541         }
 542
 543         if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
 544                 result |= USB_PW_CONN;
 545
 546         return result;
 547 }
 548
 549 /**
 550  * ab8500_charger_max_usb_curr() - get the max curr for the USB type
 551  * @di:                 pointer to the ab8500_charger structure
 552  * @link_status:        the identified USB type
 553  *
 554  * Get the maximum current that is allowed to be drawn from the host
 555  * based on the USB type.
 556  * Returns error code in case of failure else 0 on success
 557  */
 558 static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
 559         enum ab8500_charger_link_status link_status)
 560 {
 561         int ret = 0;
 562
 563         switch (link_status) {
 564         case USB_STAT_STD_HOST_NC:
 565         case USB_STAT_STD_HOST_C_NS:
 566         case USB_STAT_STD_HOST_C_S:
 567                 dev_dbg(di->dev, "USB Type - Standard host is "
 568                         "detected through USB driver\n");
 569                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P09;
 570                 break;
 571         case USB_STAT_HOST_CHG_HS_CHIRP:
 572                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
 573                 break;
 574         case USB_STAT_HOST_CHG_HS:
 575         case USB_STAT_ACA_RID_C_HS:
 576                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P9;
 577                 break;
 578         case USB_STAT_ACA_RID_A:
 579                 /*
 580                  * Dedicated charger level minus maximum current accessory
 581                  * can consume (300mA). Closest level is 1100mA
 582                  */
 583                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P1;
 584                 break;
 585         case USB_STAT_ACA_RID_B:
 586                 /*
 587                  * Dedicated charger level minus 120mA (20mA for ACA and
 588                  * 100mA for potential accessory). Closest level is 1300mA
 589                  */
 590                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P3;
 591                 break;
 592         case USB_STAT_DEDICATED_CHG:
 593         case USB_STAT_HOST_CHG_NM:
 594         case USB_STAT_ACA_RID_C_HS_CHIRP:
 595         case USB_STAT_ACA_RID_C_NM:
 596                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
 597                 break;
 598         case USB_STAT_RESERVED:
 599                 /*
 600                  * This state is used to indicate that VBUS has dropped below
 601                  * the detection level 4 times in a row. This is due to the
 602                  * charger output current is set to high making the charger
 603                  * voltage collapse. This have to be propagated through to
 604                  * chargalg. This is done using the property
 605                  * POWER_SUPPLY_PROP_CURRENT_AVG = 1
 606                  */
 607                 di->flags.vbus_collapse = true;
 608                 dev_dbg(di->dev, "USB Type - USB_STAT_RESERVED "
 609                         "VBUS has collapsed\n");
 610                 ret = -1;
 611                 break;
 612         case USB_STAT_HM_IDGND:
 613         case USB_STAT_NOT_CONFIGURED:
 614         case USB_STAT_NOT_VALID_LINK:
 615                 dev_err(di->dev, "USB Type - Charging not allowed\n");
 616                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
 617                 ret = -ENXIO;
 618                 break;
 619         default:
 620                 dev_err(di->dev, "USB Type - Unknown\n");
 621                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
 622                 ret = -ENXIO;
 623                 break;
 624         };
 625
 626         dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
 627                 link_status, di->max_usb_in_curr);
 628
 629         return ret;
 630 }
 631
 632 /**
 633  * ab8500_charger_read_usb_type() - read the type of usb connected
 634  * @di:         pointer to the ab8500_charger structure
 635  *
 636  * Detect the type of the plugged USB
 637  * Returns error code in case of failure else 0 on success
 638  */
 639 static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
 640 {
 641         int ret;
 642         u8 val;
 643
 644         ret = abx500_get_register_interruptible(di->dev,
 645                 AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
 646         if (ret < 0) {
 647                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 648                 return ret;
 649         }
 650         ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
 651                 AB8500_USB_LINE_STAT_REG, &val);
 652         if (ret < 0) {
 653                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 654                 return ret;
 655         }
 656
 657         /* get the USB type */
 658         val = (val & AB8500_USB_LINK_STATUS) >> 3;
 659         ret = ab8500_charger_max_usb_curr(di,
 660                 (enum ab8500_charger_link_status) val);
 661
 662         return ret;
 663 }
 664
 665 /**
 666  * ab8500_charger_detect_usb_type() - get the type of usb connected
 667  * @di:         pointer to the ab8500_charger structure
 668  *
 669  * Detect the type of the plugged USB
 670  * Returns error code in case of failure else 0 on success
 671  */
 672 static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
 673 {
 674         int i, ret;
 675         u8 val;
 676
 677         /*
 678          * On getting the VBUS rising edge detect interrupt there
 679          * is a 250ms delay after which the register UsbLineStatus
 680          * is filled with valid data.
 681          */
 682         for (i = 0; i < 10; i++) {
 683                 msleep(250);
 684                 ret = abx500_get_register_interruptible(di->dev,
 685                         AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
 686                         &val);
 687                 if (ret < 0) {
 688                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 689                         return ret;
 690                 }
 691                 ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
 692                         AB8500_USB_LINE_STAT_REG, &val);
 693                 if (ret < 0) {
 694                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
 695                         return ret;
 696                 }
 697                 /*
 698                  * Until the IT source register is read the UsbLineStatus
 699                  * register is not updated, hence doing the same
 700                  * Revisit this:
 701                  */
 702
 703                 /* get the USB type */
 704                 val = (val & AB8500_USB_LINK_STATUS) >> 3;
 705                 if (val)
 706                         break;
 707         }
 708         ret = ab8500_charger_max_usb_curr(di,
 709                 (enum ab8500_charger_link_status) val);
 710
 711         return ret;
 712 }
 713
 714 /*
 715  * This array maps the raw hex value to charger voltage used by the AB8500
 716  * Values taken from the UM0836
 717  */
 718 static int ab8500_charger_voltage_map[] = {
 719         3500 ,
 720         3525 ,
 721         3550 ,
 722         3575 ,
 723         3600 ,
 724         3625 ,
 725         3650 ,
 726         3675 ,
 727         3700 ,
 728         3725 ,
 729         3750 ,
 730         3775 ,
 731         3800 ,
 732         3825 ,
 733         3850 ,
 734         3875 ,
 735         3900 ,
 736         3925 ,
 737         3950 ,
 738         3975 ,
 739         4000 ,
 740         4025 ,
 741         4050 ,
 742         4060 ,
 743         4070 ,
 744         4080 ,
 745         4090 ,
 746         4100 ,
 747         4110 ,
 748         4120 ,
 749         4130 ,
 750         4140 ,
 751         4150 ,
 752         4160 ,
 753         4170 ,
 754         4180 ,
 755         4190 ,
 756         4200 ,
 757         4210 ,
 758         4220 ,
 759         4230 ,
 760         4240 ,
 761         4250 ,
 762         4260 ,
 763         4270 ,
 764         4280 ,
 765         4290 ,
 766         4300 ,
 767         4310 ,
 768         4320 ,
 769         4330 ,
 770         4340 ,
 771         4350 ,
 772         4360 ,
 773         4370 ,
 774         4380 ,
 775         4390 ,
 776         4400 ,
 777         4410 ,
 778         4420 ,
 779         4430 ,
 780         4440 ,
 781         4450 ,
 782         4460 ,
 783         4470 ,
 784         4480 ,
 785         4490 ,
 786         4500 ,
 787         4510 ,
 788         4520 ,
 789         4530 ,
 790         4540 ,
 791         4550 ,
 792         4560 ,
 793         4570 ,
 794         4580 ,
 795         4590 ,
 796         4600 ,
 797 };
 798
 799 /*
 800  * This array maps the raw hex value to charger current used by the AB8500
 801  * Values taken from the UM0836
 802  */
 803 static int ab8500_charger_current_map[] = {
 804         100 ,
 805         200 ,
 806         300 ,
 807         400 ,
 808         500 ,
 809         600 ,
 810         700 ,
 811         800 ,
 812         900 ,
 813         1000 ,
 814         1100 ,
 815         1200 ,
 816         1300 ,
 817         1400 ,
 818         1500 ,
 819 };
 820
 821 /*
 822  * This array maps the raw hex value to VBUS input current used by the AB8500
 823  * Values taken from the UM0836
 824  */
 825 static int ab8500_charger_vbus_in_curr_map[] = {
 826         USB_CH_IP_CUR_LVL_0P05,
 827         USB_CH_IP_CUR_LVL_0P09,
 828         USB_CH_IP_CUR_LVL_0P19,
 829         USB_CH_IP_CUR_LVL_0P29,
 830         USB_CH_IP_CUR_LVL_0P38,
 831         USB_CH_IP_CUR_LVL_0P45,
 832         USB_CH_IP_CUR_LVL_0P5,
 833         USB_CH_IP_CUR_LVL_0P6,
 834         USB_CH_IP_CUR_LVL_0P7,
 835         USB_CH_IP_CUR_LVL_0P8,
 836         USB_CH_IP_CUR_LVL_0P9,
 837         USB_CH_IP_CUR_LVL_1P0,
 838         USB_CH_IP_CUR_LVL_1P1,
 839         USB_CH_IP_CUR_LVL_1P3,
 840         USB_CH_IP_CUR_LVL_1P4,
 841         USB_CH_IP_CUR_LVL_1P5,
 842 };
 843
 844 static int ab8500_voltage_to_regval(int voltage)
 845 {
 846         int i;
 847
 848         /* Special case for voltage below 3.5V */
 849         if (voltage < ab8500_charger_voltage_map[0])
 850                 return LOW_VOLT_REG;
 851
 852         for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
 853                 if (voltage < ab8500_charger_voltage_map[i])
 854                         return i - 1;
 855         }
 856
 857         /* If not last element, return error */
 858         i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
 859         if (voltage == ab8500_charger_voltage_map[i])
 860                 return i;
 861         else
 862                 return -1;
 863 }
 864
 865 static int ab8500_current_to_regval(int curr)
 866 {
 867         int i;
 868
 869         if (curr < ab8500_charger_current_map[0])
 870                 return 0;
 871
 872         for (i = 0; i < ARRAY_SIZE(ab8500_charger_current_map); i++) {
 873                 if (curr < ab8500_charger_current_map[i])
 874                         return i - 1;
 875         }
 876
 877         /* If not last element, return error */
 878         i = ARRAY_SIZE(ab8500_charger_current_map) - 1;
 879         if (curr == ab8500_charger_current_map[i])
 880                 return i;
 881         else
 882                 return -1;
 883 }
 884
 885 static int ab8500_vbus_in_curr_to_regval(int curr)
 886 {
 887         int i;
 888
 889         if (curr < ab8500_charger_vbus_in_curr_map[0])
 890                 return 0;
 891
 892         for (i = 0; i < ARRAY_SIZE(ab8500_charger_vbus_in_curr_map); i++) {
 893                 if (curr < ab8500_charger_vbus_in_curr_map[i])
 894                         return i - 1;
 895         }
 896
 897         /* If not last element, return error */
 898         i = ARRAY_SIZE(ab8500_charger_vbus_in_curr_map) - 1;
 899         if (curr == ab8500_charger_vbus_in_curr_map[i])
 900                 return i;
 901         else
 902                 return -1;
 903 }
 904
 905 /**
 906  * ab8500_charger_get_usb_cur() - get usb current
 907  * @di:         pointer to the ab8500_charger structre
 908  *
 909  * The usb stack provides the maximum current that can be drawn from
 910  * the standard usb host. This will be in mA.
 911  * This function converts current in mA to a value that can be written
 912  * to the register. Returns -1 if charging is not allowed
 913  */
 914 static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
 915 {
 916         switch (di->usb_state.usb_current) {
 917         case 100:
 918                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P09;
 919                 break;
 920         case 200:
 921                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P19;
 922                 break;
 923         case 300:
 924                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P29;
 925                 break;
 926         case 400:
 927                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P38;
 928                 break;
 929         case 500:
 930                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
 931                 break;
 932         default:
 933                 di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
 934                 return -1;
 935                 break;
 936         };
 937         return 0;
 938 }
 939
 940 /**
 941  * ab8500_charger_set_current() - set charger current
 942  * @di:         pointer to the ab8500_charger structure
 943  * @ich:        charger current, in mA
 944  * @reg:        select what charger register to set
 945  *
 946  * Set charger current.
 947  * There is no state machine in the AB to step up/down the charger
 948  * current to avoid dips and spikes on MAIN, VBUS and VBAT when
 949  * charging is started. Instead we need to implement
 950  * this charger current step-up/down here.
 951  * Returns error code in case of failure else 0(on success)
 952  */
 953 static int ab8500_charger_set_current(struct ab8500_charger *di,
 954         int ich, int reg)
 955 {
 956         int ret, i;
 957         int curr_index, prev_curr_index, shift_value;
 958         u8 reg_value;
 959
 960         switch (reg) {
 961         case AB8500_MCH_IPT_CURLVL_REG:
 962                 shift_value = MAIN_CH_INPUT_CURR_SHIFT;
 963                 curr_index = ab8500_current_to_regval(ich);
 964                 break;
 965         case AB8500_USBCH_IPT_CRNTLVL_REG:
 966                 shift_value = VBUS_IN_CURR_LIM_SHIFT;
 967                 curr_index = ab8500_vbus_in_curr_to_regval(ich);
 968                 break;
 969         case AB8500_CH_OPT_CRNTLVL_REG:
 970                 shift_value = 0;
 971                 curr_index = ab8500_current_to_regval(ich);
 972                 break;
 973         default:
 974                 dev_err(di->dev, "%s current register not valid\n", __func__);
 975                 return -ENXIO;
 976         }
 977
 978         if (curr_index < 0) {
 979                 dev_err(di->dev, "requested current limit out-of-range\n");
 980                 return -ENXIO;
 981         }
 982
 983         ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
 984                 reg, &reg_value);
 985         if (ret < 0) {
 986                 dev_err(di->dev, "%s read failed\n", __func__);
 987                 return ret;
 988         }
 989         prev_curr_index = (reg_value >> shift_value);
 990
 991         /* only update current if it's been changed */
 992         if (prev_curr_index == curr_index)
 993                 return 0;
 994
 995         dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
 996                 __func__, ich, reg);
 997
 998         if (prev_curr_index > curr_index) {
 999                 for (i = prev_curr_index - 1; i >= curr_index; i--) {
1000                         ret = abx500_set_register_interruptible(di->dev,
1001                                 AB8500_CHARGER, reg, (u8) i << shift_value);
1002                         if (ret) {
1003                                 dev_err(di->dev, "%s write failed\n", __func__);
1004                                 return ret;
1005                         }
1006                         usleep_range(STEP_UDELAY, STEP_UDELAY * 2);
1007                 }
1008         } else {
1009                 for (i = prev_curr_index + 1; i <= curr_index; i++) {
1010                         ret = abx500_set_register_interruptible(di->dev,
1011                                 AB8500_CHARGER, reg, (u8) i << shift_value);
1012                         if (ret) {
1013                                 dev_err(di->dev, "%s write failed\n", __func__);
1014                                 return ret;
1015                         }
1016                         usleep_range(STEP_UDELAY, STEP_UDELAY * 2);
1017                 }
1018         }
1019         return ret;
1020 }
1021
1022 /**
1023  * ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
1024  * @di:         pointer to the ab8500_charger structure
1025  * @ich_in:     charger input current limit
1026  *
1027  * Sets the current that can be drawn from the USB host
1028  * Returns error code in case of failure else 0(on success)
1029  */
1030 static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
1031                 int ich_in)
1032 {
1033         int min_value;
1034
1035         /* We should always use to lowest current limit */
1036         min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
1037
1038         switch (min_value) {
1039         case 100:
1040                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1041                         min_value = USB_CH_IP_CUR_LVL_0P05;
1042                 break;
1043         case 500:
1044                 if (di->vbat < VBAT_TRESH_IP_CUR_RED)
1045                         min_value = USB_CH_IP_CUR_LVL_0P45;
1046                 break;
1047         default:
1048                 break;
1049         }
1050
1051         return ab8500_charger_set_current(di, min_value,
1052                 AB8500_USBCH_IPT_CRNTLVL_REG);
1053 }
1054
1055 /**
1056  * ab8500_charger_set_main_in_curr() - set main charger input current
1057  * @di:         pointer to the ab8500_charger structure
1058  * @ich_in:     input charger current, in mA
1059  *
1060  * Set main charger input current.
1061  * Returns error code in case of failure else 0(on success)
1062  */
1063 static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
1064         int ich_in)
1065 {
1066         return ab8500_charger_set_current(di, ich_in,
1067                 AB8500_MCH_IPT_CURLVL_REG);
1068 }
1069
1070 /**
1071  * ab8500_charger_set_output_curr() - set charger output current
1072  * @di:         pointer to the ab8500_charger structure
1073  * @ich_out:    output charger current, in mA
1074  *
1075  * Set charger output current.
1076  * Returns error code in case of failure else 0(on success)
1077  */
1078 static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
1079         int ich_out)
1080 {
1081         return ab8500_charger_set_current(di, ich_out,
1082                 AB8500_CH_OPT_CRNTLVL_REG);
1083 }
1084
1085 /**
1086  * ab8500_charger_led_en() - turn on/off chargign led
1087  * @di:         pointer to the ab8500_charger structure
1088  * @on:         flag to turn on/off the chargign led
1089  *
1090  * Power ON/OFF charging LED indication
1091  * Returns error code in case of failure else 0(on success)
1092  */
1093 static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
1094 {
1095         int ret;
1096
1097         if (on) {
1098                 /* Power ON charging LED indicator, set LED current to 5mA */
1099                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1100                         AB8500_LED_INDICATOR_PWM_CTRL,
1101                         (LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
1102                 if (ret) {
1103                         dev_err(di->dev, "Power ON LED failed\n");
1104                         return ret;
1105                 }
1106                 /* LED indicator PWM duty cycle 252/256 */
1107                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1108                         AB8500_LED_INDICATOR_PWM_DUTY,
1109                         LED_INDICATOR_PWM_DUTY_252_256);
1110                 if (ret) {
1111                         dev_err(di->dev, "Set LED PWM duty cycle failed\n");
1112                         return ret;
1113                 }
1114         } else {
1115                 /* Power off charging LED indicator */
1116                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1117                         AB8500_LED_INDICATOR_PWM_CTRL,
1118                         LED_INDICATOR_PWM_DIS);
1119                 if (ret) {
1120                         dev_err(di->dev, "Power-off LED failed\n");
1121                         return ret;
1122                 }
1123         }
1124
1125         return ret;
1126 }
1127
1128 /**
1129  * ab8500_charger_ac_en() - enable or disable ac charging
1130  * @di:         pointer to the ab8500_charger structure
1131  * @enable:     enable/disable flag
1132  * @vset:       charging voltage
1133  * @iset:       charging current
1134  *
1135  * Enable/Disable AC/Mains charging and turns on/off the charging led
1136  * respectively.
1137  **/
1138 static int ab8500_charger_ac_en(struct ux500_charger *charger,
1139         int enable, int vset, int iset)
1140 {
1141         int ret;
1142         int volt_index;
1143         int curr_index;
1144         int input_curr_index;
1145         u8 overshoot = 0;
1146
1147         struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
1148
1149         if (enable) {
1150                 /* Check if AC is connected */
1151                 if (!di->ac.charger_connected) {
1152                         dev_err(di->dev, "AC charger not connected\n");
1153                         return -ENXIO;
1154                 }
1155
1156                 /* Enable AC charging */
1157                 dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
1158
1159                 /*
1160                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1161                  * will be triggered everytime we enable the VDD ADC supply.
1162                  * This will turn off charging for a short while.
1163                  * It can be avoided by having the supply on when
1164                  * there is a charger enabled. Normally the VDD ADC supply
1165                  * is enabled everytime a GPADC conversion is triggered. We will
1166                  * force it to be enabled from this driver to have
1167                  * the GPADC module independant of the AB8500 chargers
1168                  */
1169                 if (!di->vddadc_en_ac) {
1170                         regulator_enable(di->regu);
1171                         di->vddadc_en_ac = true;
1172                 }
1173
1174                 /* Check if the requested voltage or current is valid */
1175                 volt_index = ab8500_voltage_to_regval(vset);
1176                 curr_index = ab8500_current_to_regval(iset);
1177                 input_curr_index = ab8500_current_to_regval(
1178                         di->bm->chg_params->ac_curr_max);
1179                 if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
1180                         dev_err(di->dev,
1181                                 "Charger voltage or current too high, "
1182                                 "charging not started\n");
1183                         return -ENXIO;
1184                 }
1185
1186                 /* ChVoltLevel: maximum battery charging voltage */
1187                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1188                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1189                 if (ret) {
1190                         dev_err(di->dev, "%s write failed\n", __func__);
1191                         return ret;
1192                 }
1193                 /* MainChInputCurr: current that can be drawn from the charger*/
1194                 ret = ab8500_charger_set_main_in_curr(di,
1195                         di->bm->chg_params->ac_curr_max);
1196                 if (ret) {
1197                         dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
1198                                 __func__);
1199                         return ret;
1200                 }
1201                 /* ChOutputCurentLevel: protected output current */
1202                 ret = ab8500_charger_set_output_curr(di, iset);
1203                 if (ret) {
1204                         dev_err(di->dev, "%s "
1205                                 "Failed to set ChOutputCurentLevel\n",
1206                                 __func__);
1207                         return ret;
1208                 }
1209
1210                 /* Check if VBAT overshoot control should be enabled */
1211                 if (!di->bm->enable_overshoot)
1212                         overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
1213
1214                 /* Enable Main Charger */
1215                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1216                         AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
1217                 if (ret) {
1218                         dev_err(di->dev, "%s write failed\n", __func__);
1219                         return ret;
1220                 }
1221
1222                 /* Power on charging LED indication */
1223                 ret = ab8500_charger_led_en(di, true);
1224                 if (ret < 0)
1225                         dev_err(di->dev, "failed to enable LED\n");
1226
1227                 di->ac.charger_online = 1;
1228         } else {
1229                 /* Disable AC charging */
1230                 if (is_ab8500_1p1_or_earlier(di->parent)) {
1231                         /*
1232                          * For ABB revision 1.0 and 1.1 there is a bug in the
1233                          * watchdog logic. That means we have to continously
1234                          * kick the charger watchdog even when no charger is
1235                          * connected. This is only valid once the AC charger
1236                          * has been enabled. This is a bug that is not handled
1237                          * by the algorithm and the watchdog have to be kicked
1238                          * by the charger driver when the AC charger
1239                          * is disabled
1240                          */
1241                         if (di->ac_conn) {
1242                                 queue_delayed_work(di->charger_wq,
1243                                         &di->kick_wd_work,
1244                                         round_jiffies(WD_KICK_INTERVAL));
1245                         }
1246
1247                         /*
1248                          * We can't turn off charging completely
1249                          * due to a bug in AB8500 cut1.
1250                          * If we do, charging will not start again.
1251                          * That is why we set the lowest voltage
1252                          * and current possible
1253                          */
1254                         ret = abx500_set_register_interruptible(di->dev,
1255                                 AB8500_CHARGER,
1256                                 AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
1257                         if (ret) {
1258                                 dev_err(di->dev,
1259                                         "%s write failed\n", __func__);
1260                                 return ret;
1261                         }
1262
1263                         ret = ab8500_charger_set_output_curr(di, 0);
1264                         if (ret) {
1265                                 dev_err(di->dev, "%s "
1266                                         "Failed to set ChOutputCurentLevel\n",
1267                                         __func__);
1268                                 return ret;
1269                         }
1270                 } else {
1271                         ret = abx500_set_register_interruptible(di->dev,
1272                                 AB8500_CHARGER,
1273                                 AB8500_MCH_CTRL1, 0);
1274                         if (ret) {
1275                                 dev_err(di->dev,
1276                                         "%s write failed\n", __func__);
1277                                 return ret;
1278                         }
1279                 }
1280
1281                 ret = ab8500_charger_led_en(di, false);
1282                 if (ret < 0)
1283                         dev_err(di->dev, "failed to disable LED\n");
1284
1285                 di->ac.charger_online = 0;
1286                 di->ac.wd_expired = false;
1287
1288                 /* Disable regulator if enabled */
1289                 if (di->vddadc_en_ac) {
1290                         regulator_disable(di->regu);
1291                         di->vddadc_en_ac = false;
1292                 }
1293
1294                 dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
1295         }
1296         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1297
1298         return ret;
1299 }
1300
1301 /**
1302  * ab8500_charger_usb_en() - enable usb charging
1303  * @di:         pointer to the ab8500_charger structure
1304  * @enable:     enable/disable flag
1305  * @vset:       charging voltage
1306  * @ich_out:    charger output current
1307  *
1308  * Enable/Disable USB charging and turns on/off the charging led respectively.
1309  * Returns error code in case of failure else 0(on success)
1310  */
1311 static int ab8500_charger_usb_en(struct ux500_charger *charger,
1312         int enable, int vset, int ich_out)
1313 {
1314         int ret;
1315         int volt_index;
1316         int curr_index;
1317         u8 overshoot = 0;
1318
1319         struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
1320
1321         if (enable) {
1322                 /* Check if USB is connected */
1323                 if (!di->usb.charger_connected) {
1324                         dev_err(di->dev, "USB charger not connected\n");
1325                         return -ENXIO;
1326                 }
1327
1328                 /*
1329                  * Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
1330                  * will be triggered everytime we enable the VDD ADC supply.
1331                  * This will turn off charging for a short while.
1332                  * It can be avoided by having the supply on when
1333                  * there is a charger enabled. Normally the VDD ADC supply
1334                  * is enabled everytime a GPADC conversion is triggered. We will
1335                  * force it to be enabled from this driver to have
1336                  * the GPADC module independant of the AB8500 chargers
1337                  */
1338                 if (!di->vddadc_en_usb) {
1339                         regulator_enable(di->regu);
1340                         di->vddadc_en_usb = true;
1341                 }
1342
1343                 /* Enable USB charging */
1344                 dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
1345
1346                 /* Check if the requested voltage or current is valid */
1347                 volt_index = ab8500_voltage_to_regval(vset);
1348                 curr_index = ab8500_current_to_regval(ich_out);
1349                 if (volt_index < 0 || curr_index < 0) {
1350                         dev_err(di->dev,
1351                                 "Charger voltage or current too high, "
1352                                 "charging not started\n");
1353                         return -ENXIO;
1354                 }
1355
1356                 /* ChVoltLevel: max voltage upto which battery can be charged */
1357                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1358                         AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
1359                 if (ret) {
1360                         dev_err(di->dev, "%s write failed\n", __func__);
1361                         return ret;
1362                 }
1363                 /* USBChInputCurr: current that can be drawn from the usb */
1364                 ret = ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
1365                 if (ret) {
1366                         dev_err(di->dev, "setting USBChInputCurr failed\n");
1367                         return ret;
1368                 }
1369                 /* ChOutputCurentLevel: protected output current */
1370                 ret = ab8500_charger_set_output_curr(di, ich_out);
1371                 if (ret) {
1372                         dev_err(di->dev, "%s "
1373                                 "Failed to set ChOutputCurentLevel\n",
1374                                 __func__);
1375                         return ret;
1376                 }
1377                 /* Check if VBAT overshoot control should be enabled */
1378                 if (!di->bm->enable_overshoot)
1379                         overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
1380
1381                 /* Enable USB Charger */
1382                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1383                         AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
1384                 if (ret) {
1385                         dev_err(di->dev, "%s write failed\n", __func__);
1386                         return ret;
1387                 }
1388
1389                 /* If success power on charging LED indication */
1390                 ret = ab8500_charger_led_en(di, true);
1391                 if (ret < 0)
1392                         dev_err(di->dev, "failed to enable LED\n");
1393
1394                 queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
1395
1396                 di->usb.charger_online = 1;
1397         } else {
1398                 /* Disable USB charging */
1399                 ret = abx500_set_register_interruptible(di->dev,
1400                         AB8500_CHARGER,
1401                         AB8500_USBCH_CTRL1_REG, 0);
1402                 if (ret) {
1403                         dev_err(di->dev,
1404                                 "%s write failed\n", __func__);
1405                         return ret;
1406                 }
1407
1408                 ret = ab8500_charger_led_en(di, false);
1409                 if (ret < 0)
1410                         dev_err(di->dev, "failed to disable LED\n");
1411
1412                 di->usb.charger_online = 0;
1413                 di->usb.wd_expired = false;
1414
1415                 /* Disable regulator if enabled */
1416                 if (di->vddadc_en_usb) {
1417                         regulator_disable(di->regu);
1418                         di->vddadc_en_usb = false;
1419                 }
1420
1421                 dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
1422
1423                 /* Cancel any pending Vbat check work */
1424                 if (delayed_work_pending(&di->check_vbat_work))
1425                         cancel_delayed_work(&di->check_vbat_work);
1426
1427         }
1428         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1429
1430         return ret;
1431 }
1432
1433 /**
1434  * ab8500_charger_watchdog_kick() - kick charger watchdog
1435  * @di:         pointer to the ab8500_charger structure
1436  *
1437  * Kick charger watchdog
1438  * Returns error code in case of failure else 0(on success)
1439  */
1440 static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
1441 {
1442         int ret;
1443         struct ab8500_charger *di;
1444
1445         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1446                 di = to_ab8500_charger_ac_device_info(charger);
1447         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1448                 di = to_ab8500_charger_usb_device_info(charger);
1449         else
1450                 return -ENXIO;
1451
1452         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1453                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1454         if (ret)
1455                 dev_err(di->dev, "Failed to kick WD!\n");
1456
1457         return ret;
1458 }
1459
1460 /**
1461  * ab8500_charger_update_charger_current() - update charger current
1462  * @di:         pointer to the ab8500_charger structure
1463  *
1464  * Update the charger output current for the specified charger
1465  * Returns error code in case of failure else 0(on success)
1466  */
1467 static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
1468                 int ich_out)
1469 {
1470         int ret;
1471         struct ab8500_charger *di;
1472
1473         if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
1474                 di = to_ab8500_charger_ac_device_info(charger);
1475         else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
1476                 di = to_ab8500_charger_usb_device_info(charger);
1477         else
1478                 return -ENXIO;
1479
1480         ret = ab8500_charger_set_output_curr(di, ich_out);
1481         if (ret) {
1482                 dev_err(di->dev, "%s "
1483                         "Failed to set ChOutputCurentLevel\n",
1484                         __func__);
1485                 return ret;
1486         }
1487
1488         /* Reset the main and usb drop input current measurement counter */
1489         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1490                                 AB8500_CHARGER_CTRL,
1491                                 0x1);
1492         if (ret) {
1493                 dev_err(di->dev, "%s write failed\n", __func__);
1494                 return ret;
1495         }
1496
1497         return ret;
1498 }
1499
1500 static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
1501 {
1502         struct power_supply *psy;
1503         struct power_supply *ext;
1504         struct ab8500_charger *di;
1505         union power_supply_propval ret;
1506         int i, j;
1507         bool psy_found = false;
1508         struct ux500_charger *usb_chg;
1509
1510         usb_chg = (struct ux500_charger *)data;
1511         psy = &usb_chg->psy;
1512
1513         di = to_ab8500_charger_usb_device_info(usb_chg);
1514
1515         ext = dev_get_drvdata(dev);
1516
1517         /* For all psy where the driver name appears in any supplied_to */
1518         for (i = 0; i < ext->num_supplicants; i++) {
1519                 if (!strcmp(ext->supplied_to[i], psy->name))
1520                         psy_found = true;
1521         }
1522
1523         if (!psy_found)
1524                 return 0;
1525
1526         /* Go through all properties for the psy */
1527         for (j = 0; j < ext->num_properties; j++) {
1528                 enum power_supply_property prop;
1529                 prop = ext->properties[j];
1530
1531                 if (ext->get_property(ext, prop, &ret))
1532                         continue;
1533
1534                 switch (prop) {
1535                 case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1536                         switch (ext->type) {
1537                         case POWER_SUPPLY_TYPE_BATTERY:
1538                                 di->vbat = ret.intval / 1000;
1539                                 break;
1540                         default:
1541                                 break;
1542                         }
1543                         break;
1544                 default:
1545                         break;
1546                 }
1547         }
1548         return 0;
1549 }
1550
1551 /**
1552  * ab8500_charger_check_vbat_work() - keep vbus current within spec
1553  * @work        pointer to the work_struct structure
1554  *
1555  * Due to a asic bug it is necessary to lower the input current to the vbus
1556  * charger when charging with at some specific levels. This issue is only valid
1557  * for below a certain battery voltage. This function makes sure that the
1558  * the allowed current limit isn't exceeded.
1559  */
1560 static void ab8500_charger_check_vbat_work(struct work_struct *work)
1561 {
1562         int t = 10;
1563         struct ab8500_charger *di = container_of(work,
1564                 struct ab8500_charger, check_vbat_work.work);
1565
1566         class_for_each_device(power_supply_class, NULL,
1567                 &di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
1568
1569         /* First run old_vbat is 0. */
1570         if (di->old_vbat == 0)
1571                 di->old_vbat = di->vbat;
1572
1573         if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
1574                 di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
1575                 (di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
1576                 di->vbat > VBAT_TRESH_IP_CUR_RED))) {
1577
1578                 dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
1579                         " old: %d\n", di->max_usb_in_curr, di->vbat,
1580                         di->old_vbat);
1581                 ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
1582                 power_supply_changed(&di->usb_chg.psy);
1583         }
1584
1585         di->old_vbat = di->vbat;
1586
1587         /*
1588          * No need to check the battery voltage every second when not close to
1589          * the threshold.
1590          */
1591         if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
1592                 (di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
1593                         t = 1;
1594
1595         queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
1596 }
1597
1598 /**
1599  * ab8500_charger_check_hw_failure_work() - check main charger failure
1600  * @work:       pointer to the work_struct structure
1601  *
1602  * Work queue function for checking the main charger status
1603  */
1604 static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
1605 {
1606         int ret;
1607         u8 reg_value;
1608
1609         struct ab8500_charger *di = container_of(work,
1610                 struct ab8500_charger, check_hw_failure_work.work);
1611
1612         /* Check if the status bits for HW failure is still active */
1613         if (di->flags.mainextchnotok) {
1614                 ret = abx500_get_register_interruptible(di->dev,
1615                         AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
1616                 if (ret < 0) {
1617                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1618                         return;
1619                 }
1620                 if (!(reg_value & MAIN_CH_NOK)) {
1621                         di->flags.mainextchnotok = false;
1622                         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1623                 }
1624         }
1625         if (di->flags.vbus_ovv) {
1626                 ret = abx500_get_register_interruptible(di->dev,
1627                         AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
1628                         &reg_value);
1629                 if (ret < 0) {
1630                         dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1631                         return;
1632                 }
1633                 if (!(reg_value & VBUS_OVV_TH)) {
1634                         di->flags.vbus_ovv = false;
1635                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1636                 }
1637         }
1638         /* If we still have a failure, schedule a new check */
1639         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
1640                 queue_delayed_work(di->charger_wq,
1641                         &di->check_hw_failure_work, round_jiffies(HZ));
1642         }
1643 }
1644
1645 /**
1646  * ab8500_charger_kick_watchdog_work() - kick the watchdog
1647  * @work:       pointer to the work_struct structure
1648  *
1649  * Work queue function for kicking the charger watchdog.
1650  *
1651  * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
1652  * logic. That means we have to continously kick the charger
1653  * watchdog even when no charger is connected. This is only
1654  * valid once the AC charger has been enabled. This is
1655  * a bug that is not handled by the algorithm and the
1656  * watchdog have to be kicked by the charger driver
1657  * when the AC charger is disabled
1658  */
1659 static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
1660 {
1661         int ret;
1662
1663         struct ab8500_charger *di = container_of(work,
1664                 struct ab8500_charger, kick_wd_work.work);
1665
1666         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
1667                 AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
1668         if (ret)
1669                 dev_err(di->dev, "Failed to kick WD!\n");
1670
1671         /* Schedule a new watchdog kick */
1672         queue_delayed_work(di->charger_wq,
1673                 &di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
1674 }
1675
1676 /**
1677  * ab8500_charger_ac_work() - work to get and set main charger status
1678  * @work:       pointer to the work_struct structure
1679  *
1680  * Work queue function for checking the main charger status
1681  */
1682 static void ab8500_charger_ac_work(struct work_struct *work)
1683 {
1684         int ret;
1685
1686         struct ab8500_charger *di = container_of(work,
1687                 struct ab8500_charger, ac_work);
1688
1689         /*
1690          * Since we can't be sure that the events are received
1691          * synchronously, we have the check if the main charger is
1692          * connected by reading the status register
1693          */
1694         ret = ab8500_charger_detect_chargers(di);
1695         if (ret < 0)
1696                 return;
1697
1698         if (ret & AC_PW_CONN) {
1699                 di->ac.charger_connected = 1;
1700                 di->ac_conn = true;
1701         } else {
1702                 di->ac.charger_connected = 0;
1703         }
1704
1705         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1706         sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
1707 }
1708
1709 /**
1710  * ab8500_charger_detect_usb_type_work() - work to detect USB type
1711  * @work:       Pointer to the work_struct structure
1712  *
1713  * Detect the type of USB plugged
1714  */
1715 static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
1716 {
1717         int ret;
1718
1719         struct ab8500_charger *di = container_of(work,
1720                 struct ab8500_charger, detect_usb_type_work);
1721
1722         /*
1723          * Since we can't be sure that the events are received
1724          * synchronously, we have the check if is
1725          * connected by reading the status register
1726          */
1727         ret = ab8500_charger_detect_chargers(di);
1728         if (ret < 0)
1729                 return;
1730
1731         if (!(ret & USB_PW_CONN)) {
1732                 di->vbus_detected = 0;
1733                 ab8500_charger_set_usb_connected(di, false);
1734                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
1735         } else {
1736                 di->vbus_detected = 1;
1737
1738                 if (is_ab8500_1p1_or_earlier(di->parent)) {
1739                         ret = ab8500_charger_detect_usb_type(di);
1740                         if (!ret) {
1741                                 ab8500_charger_set_usb_connected(di, true);
1742                                 ab8500_power_supply_changed(di,
1743                                                             &di->usb_chg.psy);
1744                         }
1745                 } else {
1746                         /* For ABB cut2.0 and onwards we have an IRQ,
1747                          * USB_LINK_STATUS that will be triggered when the USB
1748                          * link status changes. The exception is USB connected
1749                          * during startup. Then we don't get a
1750                          * USB_LINK_STATUS IRQ
1751                          */
1752                         if (di->vbus_detected_start) {
1753                                 di->vbus_detected_start = false;
1754                                 ret = ab8500_charger_detect_usb_type(di);
1755                                 if (!ret) {
1756                                         ab8500_charger_set_usb_connected(di,
1757                                                 true);
1758                                         ab8500_power_supply_changed(di,
1759                                                 &di->usb_chg.psy);
1760                                 }
1761                         }
1762                 }
1763         }
1764 }
1765
1766 /**
1767  * ab8500_charger_usb_link_status_work() - work to detect USB type
1768  * @work:       pointer to the work_struct structure
1769  *
1770  * Detect the type of USB plugged
1771  */
1772 static void ab8500_charger_usb_link_status_work(struct work_struct *work)
1773 {
1774         int ret;
1775
1776         struct ab8500_charger *di = container_of(work,
1777                 struct ab8500_charger, usb_link_status_work);
1778
1779         /*
1780          * Since we can't be sure that the events are received
1781          * synchronously, we have the check if  is
1782          * connected by reading the status register
1783          */
1784         ret = ab8500_charger_detect_chargers(di);
1785         if (ret < 0)
1786                 return;
1787
1788         if (!(ret & USB_PW_CONN)) {
1789                 di->vbus_detected = 0;
1790                 ab8500_charger_set_usb_connected(di, false);
1791                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
1792         } else {
1793                 di->vbus_detected = 1;
1794                 ret = ab8500_charger_read_usb_type(di);
1795                 if (!ret) {
1796                         /* Update maximum input current */
1797                         ret = ab8500_charger_set_vbus_in_curr(di,
1798                                         di->max_usb_in_curr);
1799                         if (ret)
1800                                 return;
1801
1802                         ab8500_charger_set_usb_connected(di, true);
1803                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1804                 } else if (ret == -ENXIO) {
1805                         /* No valid charger type detected */
1806                         ab8500_charger_set_usb_connected(di, false);
1807                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1808                 }
1809         }
1810 }
1811
1812 static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
1813 {
1814         int ret;
1815         unsigned long flags;
1816
1817         struct ab8500_charger *di = container_of(work,
1818                 struct ab8500_charger, usb_state_changed_work);
1819
1820         if (!di->vbus_detected)
1821                 return;
1822
1823         spin_lock_irqsave(&di->usb_state.usb_lock, flags);
1824         di->usb_state.usb_changed = false;
1825         spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
1826
1827         /*
1828          * wait for some time until you get updates from the usb stack
1829          * and negotiations are completed
1830          */
1831         msleep(250);
1832
1833         if (di->usb_state.usb_changed)
1834                 return;
1835
1836         dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
1837                 __func__, di->usb_state.state, di->usb_state.usb_current);
1838
1839         switch (di->usb_state.state) {
1840         case AB8500_BM_USB_STATE_RESET_HS:
1841         case AB8500_BM_USB_STATE_RESET_FS:
1842         case AB8500_BM_USB_STATE_SUSPEND:
1843         case AB8500_BM_USB_STATE_MAX:
1844                 ab8500_charger_set_usb_connected(di, false);
1845                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
1846                 break;
1847
1848         case AB8500_BM_USB_STATE_RESUME:
1849                 /*
1850                  * when suspend->resume there should be delay
1851                  * of 1sec for enabling charging
1852                  */
1853                 msleep(1000);
1854                 /* Intentional fall through */
1855         case AB8500_BM_USB_STATE_CONFIGURED:
1856                 /*
1857                  * USB is configured, enable charging with the charging
1858                  * input current obtained from USB driver
1859                  */
1860                 if (!ab8500_charger_get_usb_cur(di)) {
1861                         /* Update maximum input current */
1862                         ret = ab8500_charger_set_vbus_in_curr(di,
1863                                         di->max_usb_in_curr);
1864                         if (ret)
1865                                 return;
1866
1867                         ab8500_charger_set_usb_connected(di, true);
1868                         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1869                 }
1870                 break;
1871
1872         default:
1873                 break;
1874         };
1875 }
1876
1877 /**
1878  * ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
1879  * @work:       pointer to the work_struct structure
1880  *
1881  * Work queue function for checking the USB charger Not OK status
1882  */
1883 static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
1884 {
1885         int ret;
1886         u8 reg_value;
1887         bool prev_status;
1888
1889         struct ab8500_charger *di = container_of(work,
1890                 struct ab8500_charger, check_usbchgnotok_work.work);
1891
1892         /* Check if the status bit for usbchargernotok is still active */
1893         ret = abx500_get_register_interruptible(di->dev,
1894                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
1895         if (ret < 0) {
1896                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1897                 return;
1898         }
1899         prev_status = di->flags.usbchargernotok;
1900
1901         if (reg_value & VBUS_CH_NOK) {
1902                 di->flags.usbchargernotok = true;
1903                 /* Check again in 1sec */
1904                 queue_delayed_work(di->charger_wq,
1905                         &di->check_usbchgnotok_work, HZ);
1906         } else {
1907                 di->flags.usbchargernotok = false;
1908                 di->flags.vbus_collapse = false;
1909         }
1910
1911         if (prev_status != di->flags.usbchargernotok)
1912                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
1913 }
1914
1915 /**
1916  * ab8500_charger_check_main_thermal_prot_work() - check main thermal status
1917  * @work:       pointer to the work_struct structure
1918  *
1919  * Work queue function for checking the Main thermal prot status
1920  */
1921 static void ab8500_charger_check_main_thermal_prot_work(
1922         struct work_struct *work)
1923 {
1924         int ret;
1925         u8 reg_value;
1926
1927         struct ab8500_charger *di = container_of(work,
1928                 struct ab8500_charger, check_main_thermal_prot_work);
1929
1930         /* Check if the status bit for main_thermal_prot is still active */
1931         ret = abx500_get_register_interruptible(di->dev,
1932                 AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
1933         if (ret < 0) {
1934                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1935                 return;
1936         }
1937         if (reg_value & MAIN_CH_TH_PROT)
1938                 di->flags.main_thermal_prot = true;
1939         else
1940                 di->flags.main_thermal_prot = false;
1941
1942         ab8500_power_supply_changed(di, &di->ac_chg.psy);
1943 }
1944
1945 /**
1946  * ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
1947  * @work:       pointer to the work_struct structure
1948  *
1949  * Work queue function for checking the USB thermal prot status
1950  */
1951 static void ab8500_charger_check_usb_thermal_prot_work(
1952         struct work_struct *work)
1953 {
1954         int ret;
1955         u8 reg_value;
1956
1957         struct ab8500_charger *di = container_of(work,
1958                 struct ab8500_charger, check_usb_thermal_prot_work);
1959
1960         /* Check if the status bit for usb_thermal_prot is still active */
1961         ret = abx500_get_register_interruptible(di->dev,
1962                 AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
1963         if (ret < 0) {
1964                 dev_err(di->dev, "%s ab8500 read failed\n", __func__);
1965                 return;
1966         }
1967         if (reg_value & USB_CH_TH_PROT)
1968                 di->flags.usb_thermal_prot = true;
1969         else
1970                 di->flags.usb_thermal_prot = false;
1971
1972         ab8500_power_supply_changed(di, &di->usb_chg.psy);
1973 }
1974
1975 /**
1976  * ab8500_charger_mainchunplugdet_handler() - main charger unplugged
1977  * @irq:       interrupt number
1978  * @_di:       pointer to the ab8500_charger structure
1979  *
1980  * Returns IRQ status(IRQ_HANDLED)
1981  */
1982 static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
1983 {
1984         struct ab8500_charger *di = _di;
1985
1986         dev_dbg(di->dev, "Main charger unplugged\n");
1987         queue_work(di->charger_wq, &di->ac_work);
1988
1989         return IRQ_HANDLED;
1990 }
1991
1992 /**
1993  * ab8500_charger_mainchplugdet_handler() - main charger plugged
1994  * @irq:       interrupt number
1995  * @_di:       pointer to the ab8500_charger structure
1996  *
1997  * Returns IRQ status(IRQ_HANDLED)
1998  */
1999 static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
2000 {
2001         struct ab8500_charger *di = _di;
2002
2003         dev_dbg(di->dev, "Main charger plugged\n");
2004         queue_work(di->charger_wq, &di->ac_work);
2005
2006         return IRQ_HANDLED;
2007 }
2008
2009 /**
2010  * ab8500_charger_mainextchnotok_handler() - main charger not ok
2011  * @irq:       interrupt number
2012  * @_di:       pointer to the ab8500_charger structure
2013  *
2014  * Returns IRQ status(IRQ_HANDLED)
2015  */
2016 static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
2017 {
2018         struct ab8500_charger *di = _di;
2019
2020         dev_dbg(di->dev, "Main charger not ok\n");
2021         di->flags.mainextchnotok = true;
2022         ab8500_power_supply_changed(di, &di->ac_chg.psy);
2023
2024         /* Schedule a new HW failure check */
2025         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2026
2027         return IRQ_HANDLED;
2028 }
2029
2030 /**
2031  * ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
2032  * thermal protection threshold
2033  * @irq:       interrupt number
2034  * @_di:       pointer to the ab8500_charger structure
2035  *
2036  * Returns IRQ status(IRQ_HANDLED)
2037  */
2038 static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
2039 {
2040         struct ab8500_charger *di = _di;
2041
2042         dev_dbg(di->dev,
2043                 "Die temp above Main charger thermal protection threshold\n");
2044         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2045
2046         return IRQ_HANDLED;
2047 }
2048
2049 /**
2050  * ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
2051  * thermal protection threshold
2052  * @irq:       interrupt number
2053  * @_di:       pointer to the ab8500_charger structure
2054  *
2055  * Returns IRQ status(IRQ_HANDLED)
2056  */
2057 static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
2058 {
2059         struct ab8500_charger *di = _di;
2060
2061         dev_dbg(di->dev,
2062                 "Die temp ok for Main charger thermal protection threshold\n");
2063         queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
2064
2065         return IRQ_HANDLED;
2066 }
2067
2068 /**
2069  * ab8500_charger_vbusdetf_handler() - VBUS falling detected
2070  * @irq:       interrupt number
2071  * @_di:       pointer to the ab8500_charger structure
2072  *
2073  * Returns IRQ status(IRQ_HANDLED)
2074  */
2075 static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
2076 {
2077         struct ab8500_charger *di = _di;
2078
2079         dev_dbg(di->dev, "VBUS falling detected\n");
2080         queue_work(di->charger_wq, &di->detect_usb_type_work);
2081
2082         return IRQ_HANDLED;
2083 }
2084
2085 /**
2086  * ab8500_charger_vbusdetr_handler() - VBUS rising detected
2087  * @irq:       interrupt number
2088  * @_di:       pointer to the ab8500_charger structure
2089  *
2090  * Returns IRQ status(IRQ_HANDLED)
2091  */
2092 static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
2093 {
2094         struct ab8500_charger *di = _di;
2095
2096         di->vbus_detected = true;
2097         dev_dbg(di->dev, "VBUS rising detected\n");
2098         queue_work(di->charger_wq, &di->detect_usb_type_work);
2099
2100         return IRQ_HANDLED;
2101 }
2102
2103 /**
2104  * ab8500_charger_usblinkstatus_handler() - USB link status has changed
2105  * @irq:       interrupt number
2106  * @_di:       pointer to the ab8500_charger structure
2107  *
2108  * Returns IRQ status(IRQ_HANDLED)
2109  */
2110 static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
2111 {
2112         struct ab8500_charger *di = _di;
2113
2114         dev_dbg(di->dev, "USB link status changed\n");
2115
2116         queue_work(di->charger_wq, &di->usb_link_status_work);
2117
2118         return IRQ_HANDLED;
2119 }
2120
2121 /**
2122  * ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
2123  * thermal protection threshold
2124  * @irq:       interrupt number
2125  * @_di:       pointer to the ab8500_charger structure
2126  *
2127  * Returns IRQ status(IRQ_HANDLED)
2128  */
2129 static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
2130 {
2131         struct ab8500_charger *di = _di;
2132
2133         dev_dbg(di->dev,
2134                 "Die temp above USB charger thermal protection threshold\n");
2135         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2136
2137         return IRQ_HANDLED;
2138 }
2139
2140 /**
2141  * ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
2142  * thermal protection threshold
2143  * @irq:       interrupt number
2144  * @_di:       pointer to the ab8500_charger structure
2145  *
2146  * Returns IRQ status(IRQ_HANDLED)
2147  */
2148 static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
2149 {
2150         struct ab8500_charger *di = _di;
2151
2152         dev_dbg(di->dev,
2153                 "Die temp ok for USB charger thermal protection threshold\n");
2154         queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
2155
2156         return IRQ_HANDLED;
2157 }
2158
2159 /**
2160  * ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
2161  * @irq:       interrupt number
2162  * @_di:       pointer to the ab8500_charger structure
2163  *
2164  * Returns IRQ status(IRQ_HANDLED)
2165  */
2166 static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
2167 {
2168         struct ab8500_charger *di = _di;
2169
2170         dev_dbg(di->dev, "Not allowed USB charger detected\n");
2171         queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
2172
2173         return IRQ_HANDLED;
2174 }
2175
2176 /**
2177  * ab8500_charger_chwdexp_handler() - Charger watchdog expired
2178  * @irq:       interrupt number
2179  * @_di:       pointer to the ab8500_charger structure
2180  *
2181  * Returns IRQ status(IRQ_HANDLED)
2182  */
2183 static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
2184 {
2185         struct ab8500_charger *di = _di;
2186
2187         dev_dbg(di->dev, "Charger watchdog expired\n");
2188
2189         /*
2190          * The charger that was online when the watchdog expired
2191          * needs to be restarted for charging to start again
2192          */
2193         if (di->ac.charger_online) {
2194                 di->ac.wd_expired = true;
2195                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
2196         }
2197         if (di->usb.charger_online) {
2198                 di->usb.wd_expired = true;
2199                 ab8500_power_supply_changed(di, &di->usb_chg.psy);
2200         }
2201
2202         return IRQ_HANDLED;
2203 }
2204
2205 /**
2206  * ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
2207  * @irq:       interrupt number
2208  * @_di:       pointer to the ab8500_charger structure
2209  *
2210  * Returns IRQ status(IRQ_HANDLED)
2211  */
2212 static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
2213 {
2214         struct ab8500_charger *di = _di;
2215
2216         dev_dbg(di->dev, "VBUS overvoltage detected\n");
2217         di->flags.vbus_ovv = true;
2218         ab8500_power_supply_changed(di, &di->usb_chg.psy);
2219
2220         /* Schedule a new HW failure check */
2221         queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
2222
2223         return IRQ_HANDLED;
2224 }
2225
2226 /**
2227  * ab8500_charger_ac_get_property() - get the ac/mains properties
2228  * @psy:       pointer to the power_supply structure
2229  * @psp:       pointer to the power_supply_property structure
2230  * @val:       pointer to the power_supply_propval union
2231  *
2232  * This function gets called when an application tries to get the ac/mains
2233  * properties by reading the sysfs files.
2234  * AC/Mains properties are online, present and voltage.
2235  * online:     ac/mains charging is in progress or not
2236  * present:    presence of the ac/mains
2237  * voltage:    AC/Mains voltage
2238  * Returns error code in case of failure else 0(on success)
2239  */
2240 static int ab8500_charger_ac_get_property(struct power_supply *psy,
2241         enum power_supply_property psp,
2242         union power_supply_propval *val)
2243 {
2244         struct ab8500_charger *di;
2245
2246         di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
2247
2248         switch (psp) {
2249         case POWER_SUPPLY_PROP_HEALTH:
2250                 if (di->flags.mainextchnotok)
2251                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2252                 else if (di->ac.wd_expired || di->usb.wd_expired)
2253                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2254                 else if (di->flags.main_thermal_prot)
2255                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2256                 else
2257                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2258                 break;
2259         case POWER_SUPPLY_PROP_ONLINE:
2260                 val->intval = di->ac.charger_online;
2261                 break;
2262         case POWER_SUPPLY_PROP_PRESENT:
2263                 val->intval = di->ac.charger_connected;
2264                 break;
2265         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2266                 di->ac.charger_voltage = ab8500_charger_get_ac_voltage(di);
2267                 val->intval = di->ac.charger_voltage * 1000;
2268                 break;
2269         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2270                 /*
2271                  * This property is used to indicate when CV mode is entered
2272                  * for the AC charger
2273                  */
2274                 di->ac.cv_active = ab8500_charger_ac_cv(di);
2275                 val->intval = di->ac.cv_active;
2276                 break;
2277         case POWER_SUPPLY_PROP_CURRENT_NOW:
2278                 val->intval = ab8500_charger_get_ac_current(di) * 1000;
2279                 break;
2280         default:
2281                 return -EINVAL;
2282         }
2283         return 0;
2284 }
2285
2286 /**
2287  * ab8500_charger_usb_get_property() - get the usb properties
2288  * @psy:        pointer to the power_supply structure
2289  * @psp:        pointer to the power_supply_property structure
2290  * @val:        pointer to the power_supply_propval union
2291  *
2292  * This function gets called when an application tries to get the usb
2293  * properties by reading the sysfs files.
2294  * USB properties are online, present and voltage.
2295  * online:     usb charging is in progress or not
2296  * present:    presence of the usb
2297  * voltage:    vbus voltage
2298  * Returns error code in case of failure else 0(on success)
2299  */
2300 static int ab8500_charger_usb_get_property(struct power_supply *psy,
2301         enum power_supply_property psp,
2302         union power_supply_propval *val)
2303 {
2304         struct ab8500_charger *di;
2305
2306         di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
2307
2308         switch (psp) {
2309         case POWER_SUPPLY_PROP_HEALTH:
2310                 if (di->flags.usbchargernotok)
2311                         val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
2312                 else if (di->ac.wd_expired || di->usb.wd_expired)
2313                         val->intval = POWER_SUPPLY_HEALTH_DEAD;
2314                 else if (di->flags.usb_thermal_prot)
2315                         val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
2316                 else if (di->flags.vbus_ovv)
2317                         val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
2318                 else
2319                         val->intval = POWER_SUPPLY_HEALTH_GOOD;
2320                 break;
2321         case POWER_SUPPLY_PROP_ONLINE:
2322                 val->intval = di->usb.charger_online;
2323                 break;
2324         case POWER_SUPPLY_PROP_PRESENT:
2325                 val->intval = di->usb.charger_connected;
2326                 break;
2327         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
2328                 di->usb.charger_voltage = ab8500_charger_get_vbus_voltage(di);
2329                 val->intval = di->usb.charger_voltage * 1000;
2330                 break;
2331         case POWER_SUPPLY_PROP_VOLTAGE_AVG:
2332                 /*
2333                  * This property is used to indicate when CV mode is entered
2334                  * for the USB charger
2335                  */
2336                 di->usb.cv_active = ab8500_charger_usb_cv(di);
2337                 val->intval = di->usb.cv_active;
2338                 break;
2339         case POWER_SUPPLY_PROP_CURRENT_NOW:
2340                 val->intval = ab8500_charger_get_usb_current(di) * 1000;
2341                 break;
2342         case POWER_SUPPLY_PROP_CURRENT_AVG:
2343                 /*
2344                  * This property is used to indicate when VBUS has collapsed
2345                  * due to too high output current from the USB charger
2346                  */
2347                 if (di->flags.vbus_collapse)
2348                         val->intval = 1;
2349                 else
2350                         val->intval = 0;
2351                 break;
2352         default:
2353                 return -EINVAL;
2354         }
2355         return 0;
2356 }
2357
2358 /**
2359  * ab8500_charger_init_hw_registers() - Set up charger related registers
2360  * @di:         pointer to the ab8500_charger structure
2361  *
2362  * Set up charger OVV, watchdog and maximum voltage registers as well as
2363  * charging of the backup battery
2364  */
2365 static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
2366 {
2367         int ret = 0;
2368
2369         /* Setup maximum charger current and voltage for ABB cut2.0 */
2370         if (!is_ab8500_1p1_or_earlier(di->parent)) {
2371                 ret = abx500_set_register_interruptible(di->dev,
2372                         AB8500_CHARGER,
2373                         AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
2374                 if (ret) {
2375                         dev_err(di->dev,
2376                                 "failed to set CH_VOLT_LVL_MAX_REG\n");
2377                         goto out;
2378                 }
2379
2380                 ret = abx500_set_register_interruptible(di->dev,
2381                         AB8500_CHARGER,
2382                         AB8500_CH_OPT_CRNTLVL_MAX_REG, CH_OP_CUR_LVL_1P6);
2383                 if (ret) {
2384                         dev_err(di->dev,
2385                                 "failed to set CH_OPT_CRNTLVL_MAX_REG\n");
2386                         goto out;
2387                 }
2388         }
2389
2390         /* VBUS OVV set to 6.3V and enable automatic current limitiation */
2391         ret = abx500_set_register_interruptible(di->dev,
2392                 AB8500_CHARGER,
2393                 AB8500_USBCH_CTRL2_REG,
2394                 VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
2395         if (ret) {
2396                 dev_err(di->dev, "failed to set VBUS OVV\n");
2397                 goto out;
2398         }
2399
2400         /* Enable main watchdog in OTP */
2401         ret = abx500_set_register_interruptible(di->dev,
2402                 AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
2403         if (ret) {
2404                 dev_err(di->dev, "failed to enable main WD in OTP\n");
2405                 goto out;
2406         }
2407
2408         /* Enable main watchdog */
2409         ret = abx500_set_register_interruptible(di->dev,
2410                 AB8500_SYS_CTRL2_BLOCK,
2411                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
2412         if (ret) {
2413                 dev_err(di->dev, "faile to enable main watchdog\n");
2414                 goto out;
2415         }
2416
2417         /*
2418          * Due to internal synchronisation, Enable and Kick watchdog bits
2419          * cannot be enabled in a single write.
2420          * A minimum delay of 2*32 kHz period (62.5µs) must be inserted
2421          * between writing Enable then Kick bits.
2422          */
2423         udelay(63);
2424
2425         /* Kick main watchdog */
2426         ret = abx500_set_register_interruptible(di->dev,
2427                 AB8500_SYS_CTRL2_BLOCK,
2428                 AB8500_MAIN_WDOG_CTRL_REG,
2429                 (MAIN_WDOG_ENA | MAIN_WDOG_KICK));
2430         if (ret) {
2431                 dev_err(di->dev, "failed to kick main watchdog\n");
2432                 goto out;
2433         }
2434
2435         /* Disable main watchdog */
2436         ret = abx500_set_register_interruptible(di->dev,
2437                 AB8500_SYS_CTRL2_BLOCK,
2438                 AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
2439         if (ret) {
2440                 dev_err(di->dev, "failed to disable main watchdog\n");
2441                 goto out;
2442         }
2443
2444         /* Set watchdog timeout */
2445         ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2446                 AB8500_CH_WD_TIMER_REG, WD_TIMER);
2447         if (ret) {
2448                 dev_err(di->dev, "failed to set charger watchdog timeout\n");
2449                 goto out;
2450         }
2451
2452         /* Backup battery voltage and current */
2453         ret = abx500_set_register_interruptible(di->dev,
2454                 AB8500_RTC,
2455                 AB8500_RTC_BACKUP_CHG_REG,
2456                 di->bm->bkup_bat_v |
2457                 di->bm->bkup_bat_i);
2458         if (ret) {
2459                 dev_err(di->dev, "failed to setup backup battery charging\n");
2460                 goto out;
2461         }
2462
2463         /* Enable backup battery charging */
2464         abx500_mask_and_set_register_interruptible(di->dev,
2465                 AB8500_RTC, AB8500_RTC_CTRL_REG,
2466                 RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
2467         if (ret < 0)
2468                 dev_err(di->dev, "%s mask and set failed\n", __func__);
2469
2470 out:
2471         return ret;
2472 }
2473
2474 /*
2475  * ab8500 charger driver interrupts and their respective isr
2476  */
2477 static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
2478         {"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
2479         {"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
2480         {"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
2481         {"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
2482         {"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
2483         {"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
2484         {"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
2485         {"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
2486         {"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
2487         {"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
2488         {"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
2489         {"VBUS_OVV", ab8500_charger_vbusovv_handler},
2490         {"CH_WD_EXP", ab8500_charger_chwdexp_handler},
2491 };
2492
2493 static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
2494                 unsigned long event, void *power)
2495 {
2496         struct ab8500_charger *di =
2497                 container_of(nb, struct ab8500_charger, nb);
2498         enum ab8500_usb_state bm_usb_state;
2499         unsigned mA = *((unsigned *)power);
2500
2501         if (event != USB_EVENT_VBUS) {
2502                 dev_dbg(di->dev, "not a standard host, returning\n");
2503                 return NOTIFY_DONE;
2504         }
2505
2506         /* TODO: State is fabricate  here. See if charger really needs USB
2507          * state or if mA is enough
2508          */
2509         if ((di->usb_state.usb_current == 2) && (mA > 2))
2510                 bm_usb_state = AB8500_BM_USB_STATE_RESUME;
2511         else if (mA == 0)
2512                 bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
2513         else if (mA == 2)
2514                 bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
2515         else if (mA >= 8) /* 8, 100, 500 */
2516                 bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
2517         else /* Should never occur */
2518                 bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
2519
2520         dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
2521                 __func__, bm_usb_state, mA);
2522
2523         spin_lock(&di->usb_state.usb_lock);
2524         di->usb_state.usb_changed = true;
2525         spin_unlock(&di->usb_state.usb_lock);
2526
2527         di->usb_state.state = bm_usb_state;
2528         di->usb_state.usb_current = mA;
2529
2530         queue_work(di->charger_wq, &di->usb_state_changed_work);
2531
2532         return NOTIFY_OK;
2533 }
2534
2535 #if defined(CONFIG_PM)
2536 static int ab8500_charger_resume(struct platform_device *pdev)
2537 {
2538         int ret;
2539         struct ab8500_charger *di = platform_get_drvdata(pdev);
2540
2541         /*
2542          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
2543          * logic. That means we have to continously kick the charger
2544          * watchdog even when no charger is connected. This is only
2545          * valid once the AC charger has been enabled. This is
2546          * a bug that is not handled by the algorithm and the
2547          * watchdog have to be kicked by the charger driver
2548          * when the AC charger is disabled
2549          */
2550         if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
2551                 ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
2552                         AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
2553                 if (ret)
2554                         dev_err(di->dev, "Failed to kick WD!\n");
2555
2556                 /* If not already pending start a new timer */
2557                 if (!delayed_work_pending(
2558                         &di->kick_wd_work)) {
2559                         queue_delayed_work(di->charger_wq, &di->kick_wd_work,
2560                                 round_jiffies(WD_KICK_INTERVAL));
2561                 }
2562         }
2563
2564         /* If we still have a HW failure, schedule a new check */
2565         if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
2566                 queue_delayed_work(di->charger_wq,
2567                         &di->check_hw_failure_work, 0);
2568         }
2569
2570         return 0;
2571 }
2572
2573 static int ab8500_charger_suspend(struct platform_device *pdev,
2574         pm_message_t state)
2575 {
2576         struct ab8500_charger *di = platform_get_drvdata(pdev);
2577
2578         /* Cancel any pending HW failure check */
2579         if (delayed_work_pending(&di->check_hw_failure_work))
2580                 cancel_delayed_work(&di->check_hw_failure_work);
2581
2582         return 0;
2583 }
2584 #else
2585 #define ab8500_charger_suspend      NULL
2586 #define ab8500_charger_resume       NULL
2587 #endif
2588
2589 static int ab8500_charger_remove(struct platform_device *pdev)
2590 {
2591         struct ab8500_charger *di = platform_get_drvdata(pdev);
2592         int i, irq, ret;
2593
2594         /* Disable AC charging */
2595         ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
2596
2597         /* Disable USB charging */
2598         ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
2599
2600         /* Disable interrupts */
2601         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
2602                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
2603                 free_irq(irq, di);
2604         }
2605
2606         /* Backup battery voltage and current disable */
2607         ret = abx500_mask_and_set_register_interruptible(di->dev,
2608                 AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
2609         if (ret < 0)
2610                 dev_err(di->dev, "%s mask and set failed\n", __func__);
2611
2612         usb_unregister_notifier(di->usb_phy, &di->nb);
2613         usb_put_phy(di->usb_phy);
2614
2615         /* Delete the work queue */
2616         destroy_workqueue(di->charger_wq);
2617
2618         flush_scheduled_work();
2619         power_supply_unregister(&di->usb_chg.psy);
2620         power_supply_unregister(&di->ac_chg.psy);
2621         platform_set_drvdata(pdev, NULL);
2622
2623         return 0;
2624 }
2625
2626 static char *supply_interface[] = {
2627         "ab8500_chargalg",
2628         "ab8500_fg",
2629         "ab8500_btemp",
2630 };
2631
2632 static int ab8500_charger_probe(struct platform_device *pdev)
2633 {
2634         struct device_node *np = pdev->dev.of_node;
2635         struct abx500_bm_data *plat = pdev->dev.platform_data;
2636         struct ab8500_charger *di;
2637         int irq, i, charger_status, ret = 0;
2638
2639         di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
2640         if (!di) {
2641                 dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
2642                 return -ENOMEM;
2643         }
2644
2645         if (!plat) {
2646                 dev_err(&pdev->dev, "no battery management data supplied\n");
2647                 return -EINVAL;
2648         }
2649         di->bm = plat;
2650
2651         if (np) {
2652                 ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
2653                 if (ret) {
2654                         dev_err(&pdev->dev, "failed to get battery information\n");
2655                         return ret;
2656                 }
2657                 di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
2658         } else
2659                 di->autopower_cfg = false;
2660
2661         /* get parent data */
2662         di->dev = &pdev->dev;
2663         di->parent = dev_get_drvdata(pdev->dev.parent);
2664         di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
2665
2666         /* initialize lock */
2667         spin_lock_init(&di->usb_state.usb_lock);
2668
2669         di->autopower = false;
2670
2671         /* AC supply */
2672         /* power_supply base class */
2673         di->ac_chg.psy.name = "ab8500_ac";
2674         di->ac_chg.psy.type = POWER_SUPPLY_TYPE_MAINS;
2675         di->ac_chg.psy.properties = ab8500_charger_ac_props;
2676         di->ac_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_ac_props);
2677         di->ac_chg.psy.get_property = ab8500_charger_ac_get_property;
2678         di->ac_chg.psy.supplied_to = supply_interface;
2679         di->ac_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
2680         /* ux500_charger sub-class */
2681         di->ac_chg.ops.enable = &ab8500_charger_ac_en;
2682         di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
2683         di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
2684         di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
2685                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
2686         di->ac_chg.max_out_curr = ab8500_charger_current_map[
2687                 ARRAY_SIZE(ab8500_charger_current_map) - 1];
2688
2689         /* USB supply */
2690         /* power_supply base class */
2691         di->usb_chg.psy.name = "ab8500_usb";
2692         di->usb_chg.psy.type = POWER_SUPPLY_TYPE_USB;
2693         di->usb_chg.psy.properties = ab8500_charger_usb_props;
2694         di->usb_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_usb_props);
2695         di->usb_chg.psy.get_property = ab8500_charger_usb_get_property;
2696         di->usb_chg.psy.supplied_to = supply_interface;
2697         di->usb_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
2698         /* ux500_charger sub-class */
2699         di->usb_chg.ops.enable = &ab8500_charger_usb_en;
2700         di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
2701         di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
2702         di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
2703                 ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
2704         di->usb_chg.max_out_curr = ab8500_charger_current_map[
2705                 ARRAY_SIZE(ab8500_charger_current_map) - 1];
2706
2707
2708         /* Create a work queue for the charger */
2709         di->charger_wq =
2710                 create_singlethread_workqueue("ab8500_charger_wq");
2711         if (di->charger_wq == NULL) {
2712                 dev_err(di->dev, "failed to create work queue\n");
2713                 return -ENOMEM;
2714         }
2715
2716         /* Init work for HW failure check */
2717         INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
2718                 ab8500_charger_check_hw_failure_work);
2719         INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
2720                 ab8500_charger_check_usbchargernotok_work);
2721
2722         /*
2723          * For ABB revision 1.0 and 1.1 there is a bug in the watchdog
2724          * logic. That means we have to continously kick the charger
2725          * watchdog even when no charger is connected. This is only
2726          * valid once the AC charger has been enabled. This is
2727          * a bug that is not handled by the algorithm and the
2728          * watchdog have to be kicked by the charger driver
2729          * when the AC charger is disabled
2730          */
2731         INIT_DEFERRABLE_WORK(&di->kick_wd_work,
2732                 ab8500_charger_kick_watchdog_work);
2733
2734         INIT_DEFERRABLE_WORK(&di->check_vbat_work,
2735                 ab8500_charger_check_vbat_work);
2736
2737         /* Init work for charger detection */
2738         INIT_WORK(&di->usb_link_status_work,
2739                 ab8500_charger_usb_link_status_work);
2740         INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
2741         INIT_WORK(&di->detect_usb_type_work,
2742                 ab8500_charger_detect_usb_type_work);
2743
2744         INIT_WORK(&di->usb_state_changed_work,
2745                 ab8500_charger_usb_state_changed_work);
2746
2747         /* Init work for checking HW status */
2748         INIT_WORK(&di->check_main_thermal_prot_work,
2749                 ab8500_charger_check_main_thermal_prot_work);
2750         INIT_WORK(&di->check_usb_thermal_prot_work,
2751                 ab8500_charger_check_usb_thermal_prot_work);
2752
2753         /*
2754          * VDD ADC supply needs to be enabled from this driver when there
2755          * is a charger connected to avoid erroneous BTEMP_HIGH/LOW
2756          * interrupts during charging
2757          */
2758         di->regu = devm_regulator_get(di->dev, "vddadc");
2759         if (IS_ERR(di->regu)) {
2760                 ret = PTR_ERR(di->regu);
2761                 dev_err(di->dev, "failed to get vddadc regulator\n");
2762                 goto free_charger_wq;
2763         }
2764
2765
2766         /* Initialize OVV, and other registers */
2767         ret = ab8500_charger_init_hw_registers(di);
2768         if (ret) {
2769                 dev_err(di->dev, "failed to initialize ABB registers\n");
2770                 goto free_charger_wq;
2771         }
2772
2773         /* Register AC charger class */
2774         ret = power_supply_register(di->dev, &di->ac_chg.psy);
2775         if (ret) {
2776                 dev_err(di->dev, "failed to register AC charger\n");
2777                 goto free_charger_wq;
2778         }
2779
2780         /* Register USB charger class */
2781         ret = power_supply_register(di->dev, &di->usb_chg.psy);
2782         if (ret) {
2783                 dev_err(di->dev, "failed to register USB charger\n");
2784                 goto free_ac;
2785         }
2786
2787         di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
2788         if (IS_ERR_OR_NULL(di->usb_phy)) {
2789                 dev_err(di->dev, "failed to get usb transceiver\n");
2790                 ret = -EINVAL;
2791                 goto free_usb;
2792         }
2793         di->nb.notifier_call = ab8500_charger_usb_notifier_call;
2794         ret = usb_register_notifier(di->usb_phy, &di->nb);
2795         if (ret) {
2796                 dev_err(di->dev, "failed to register usb notifier\n");
2797                 goto put_usb_phy;
2798         }
2799
2800         /* Identify the connected charger types during startup */
2801         charger_status = ab8500_charger_detect_chargers(di);
2802         if (charger_status & AC_PW_CONN) {
2803                 di->ac.charger_connected = 1;
2804                 di->ac_conn = true;
2805                 ab8500_power_supply_changed(di, &di->ac_chg.psy);
2806                 sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
2807         }
2808
2809         if (charger_status & USB_PW_CONN) {
2810                 dev_dbg(di->dev, "VBUS Detect during startup\n");
2811                 di->vbus_detected = true;
2812                 di->vbus_detected_start = true;
2813                 queue_work(di->charger_wq,
2814                         &di->detect_usb_type_work);
2815         }
2816
2817         /* Register interrupts */
2818         for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
2819                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
2820                 ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
2821                         IRQF_SHARED | IRQF_NO_SUSPEND,
2822                         ab8500_charger_irq[i].name, di);
2823
2824                 if (ret != 0) {
2825                         dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
2826                                 , ab8500_charger_irq[i].name, irq, ret);
2827                         goto free_irq;
2828                 }
2829                 dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
2830                         ab8500_charger_irq[i].name, irq, ret);
2831         }
2832
2833         platform_set_drvdata(pdev, di);
2834
2835         return ret;
2836
2837 free_irq:
2838         usb_unregister_notifier(di->usb_phy, &di->nb);
2839
2840         /* We also have to free all successfully registered irqs */
2841         for (i = i - 1; i >= 0; i--) {
2842                 irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
2843                 free_irq(irq, di);
2844         }
2845 put_usb_phy:
2846         usb_put_phy(di->usb_phy);
2847 free_usb:
2848         power_supply_unregister(&di->usb_chg.psy);
2849 free_ac:
2850         power_supply_unregister(&di->ac_chg.psy);
2851 free_charger_wq:
2852         destroy_workqueue(di->charger_wq);
2853         return ret;
2854 }
2855
2856 static const struct of_device_id ab8500_charger_match[] = {
2857         { .compatible = "stericsson,ab8500-charger", },
2858         { },
2859 };
2860
2861 static struct platform_driver ab8500_charger_driver = {
2862         .probe = ab8500_charger_probe,
2863         .remove = ab8500_charger_remove,
2864         .suspend = ab8500_charger_suspend,
2865         .resume = ab8500_charger_resume,
2866         .driver = {
2867                 .name = "ab8500-charger",
2868                 .owner = THIS_MODULE,
2869                 .of_match_table = ab8500_charger_match,
2870         },
2871 };
2872
2873 static int __init ab8500_charger_init(void)
2874 {
2875         return platform_driver_register(&ab8500_charger_driver);
2876 }
2877
2878 static void __exit ab8500_charger_exit(void)
2879 {
2880         platform_driver_unregister(&ab8500_charger_driver);
2881 }
2882
2883 subsys_initcall_sync(ab8500_charger_init);
2884 module_exit(ab8500_charger_exit);
2885
2886 MODULE_LICENSE("GPL v2");
2887 MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
2888 MODULE_ALIAS("platform:ab8500-charger");
2889 MODULE_DESCRIPTION("AB8500 charger management driver");