drivers/power/supply/cpcap-charger.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Motorola CPCAP PMIC battery charger driver
   4  *
   5  * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
   6  *
   7  * Rewritten for Linux power framework with some parts based on
   8  * on earlier driver found in the Motorola Linux kernel:
   9  *
  10  * Copyright (C) 2009-2010 Motorola, Inc.
  11  */
  12
  13 #include <linux/atomic.h>
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/err.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/notifier.h>
  20 #include <linux/of.h>
  21 #include <linux/of_platform.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/power_supply.h>
  24 #include <linux/regmap.h>
  25
  26 #include <linux/gpio/consumer.h>
  27 #include <linux/usb/phy_companion.h>
  28 #include <linux/phy/omap_usb.h>
  29 #include <linux/usb/otg.h>
  30 #include <linux/iio/consumer.h>
  31 #include <linux/mfd/motorola-cpcap.h>
  32
  33 /*
  34  * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
  35  * see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
  36  * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
  37  * and values for CPCAP are different, but some of the internal components seem
  38  * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
  39  * bits that seem to describe the CRM register.
  40  */
  41 #define CPCAP_REG_CRM_UNUSED_641_15     BIT(15) /* 641 = register number */
  42 #define CPCAP_REG_CRM_UNUSED_641_14     BIT(14) /* 641 = register number */
  43 #define CPCAP_REG_CRM_CHRG_LED_EN       BIT(13) /* Charger LED */
  44 #define CPCAP_REG_CRM_RVRSMODE          BIT(12) /* USB VBUS output enable */
  45 #define CPCAP_REG_CRM_ICHRG_TR1         BIT(11) /* Trickle charge current */
  46 #define CPCAP_REG_CRM_ICHRG_TR0         BIT(10)
  47 #define CPCAP_REG_CRM_FET_OVRD          BIT(9)  /* 0 = hardware, 1 = FET_CTRL */
  48 #define CPCAP_REG_CRM_FET_CTRL          BIT(8)  /* BPFET 1 if FET_OVRD set */
  49 #define CPCAP_REG_CRM_VCHRG3            BIT(7)  /* Charge voltage bits */
  50 #define CPCAP_REG_CRM_VCHRG2            BIT(6)
  51 #define CPCAP_REG_CRM_VCHRG1            BIT(5)
  52 #define CPCAP_REG_CRM_VCHRG0            BIT(4)
  53 #define CPCAP_REG_CRM_ICHRG3            BIT(3)  /* Charge current bits */
  54 #define CPCAP_REG_CRM_ICHRG2            BIT(2)
  55 #define CPCAP_REG_CRM_ICHRG1            BIT(1)
  56 #define CPCAP_REG_CRM_ICHRG0            BIT(0)
  57
  58 /* CPCAP_REG_CRM trickle charge voltages */
  59 #define CPCAP_REG_CRM_TR(val)           (((val) & 0x3) << 10)
  60 #define CPCAP_REG_CRM_TR_0A00           CPCAP_REG_CRM_TR(0x0)
  61 #define CPCAP_REG_CRM_TR_0A24           CPCAP_REG_CRM_TR(0x1)
  62 #define CPCAP_REG_CRM_TR_0A48           CPCAP_REG_CRM_TR(0x2)
  63 #define CPCAP_REG_CRM_TR_0A72           CPCAP_REG_CRM_TR(0x4)
  64
  65 /*
  66  * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
  67  * Note that these register bits don't match MC13783UG.pdf VCHRG
  68  * register bits.
  69  */
  70 #define CPCAP_REG_CRM_VCHRG(val)        (((val) & 0xf) << 4)
  71 #define CPCAP_REG_CRM_VCHRG_3V80        CPCAP_REG_CRM_VCHRG(0x0)
  72 #define CPCAP_REG_CRM_VCHRG_4V10        CPCAP_REG_CRM_VCHRG(0x1)
  73 #define CPCAP_REG_CRM_VCHRG_4V12        CPCAP_REG_CRM_VCHRG(0x2)
  74 #define CPCAP_REG_CRM_VCHRG_4V15        CPCAP_REG_CRM_VCHRG(0x3)
  75 #define CPCAP_REG_CRM_VCHRG_4V17        CPCAP_REG_CRM_VCHRG(0x4)
  76 #define CPCAP_REG_CRM_VCHRG_4V20        CPCAP_REG_CRM_VCHRG(0x5)
  77 #define CPCAP_REG_CRM_VCHRG_4V23        CPCAP_REG_CRM_VCHRG(0x6)
  78 #define CPCAP_REG_CRM_VCHRG_4V25        CPCAP_REG_CRM_VCHRG(0x7)
  79 #define CPCAP_REG_CRM_VCHRG_4V27        CPCAP_REG_CRM_VCHRG(0x8)
  80 #define CPCAP_REG_CRM_VCHRG_4V30        CPCAP_REG_CRM_VCHRG(0x9)
  81 #define CPCAP_REG_CRM_VCHRG_4V33        CPCAP_REG_CRM_VCHRG(0xa)
  82 #define CPCAP_REG_CRM_VCHRG_4V35        CPCAP_REG_CRM_VCHRG(0xb)
  83 #define CPCAP_REG_CRM_VCHRG_4V38        CPCAP_REG_CRM_VCHRG(0xc)
  84 #define CPCAP_REG_CRM_VCHRG_4V40        CPCAP_REG_CRM_VCHRG(0xd)
  85 #define CPCAP_REG_CRM_VCHRG_4V42        CPCAP_REG_CRM_VCHRG(0xe)
  86 #define CPCAP_REG_CRM_VCHRG_4V44        CPCAP_REG_CRM_VCHRG(0xf)
  87
  88 /*
  89  * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
  90  * values in "Table 8-3. Charge Path Regulator Current Limit
  91  * Characteristics" for the nominal values.
  92  */
  93 #define CPCAP_REG_CRM_ICHRG(val)        (((val) & 0xf) << 0)
  94 #define CPCAP_REG_CRM_ICHRG_0A000       CPCAP_REG_CRM_ICHRG(0x0)
  95 #define CPCAP_REG_CRM_ICHRG_0A070       CPCAP_REG_CRM_ICHRG(0x1)
  96 #define CPCAP_REG_CRM_ICHRG_0A177       CPCAP_REG_CRM_ICHRG(0x2)
  97 #define CPCAP_REG_CRM_ICHRG_0A266       CPCAP_REG_CRM_ICHRG(0x3)
  98 #define CPCAP_REG_CRM_ICHRG_0A355       CPCAP_REG_CRM_ICHRG(0x4)
  99 #define CPCAP_REG_CRM_ICHRG_0A443       CPCAP_REG_CRM_ICHRG(0x5)
 100 #define CPCAP_REG_CRM_ICHRG_0A532       CPCAP_REG_CRM_ICHRG(0x6)
 101 #define CPCAP_REG_CRM_ICHRG_0A621       CPCAP_REG_CRM_ICHRG(0x7)
 102 #define CPCAP_REG_CRM_ICHRG_0A709       CPCAP_REG_CRM_ICHRG(0x8)
 103 #define CPCAP_REG_CRM_ICHRG_0A798       CPCAP_REG_CRM_ICHRG(0x9)
 104 #define CPCAP_REG_CRM_ICHRG_0A886       CPCAP_REG_CRM_ICHRG(0xa)
 105 #define CPCAP_REG_CRM_ICHRG_0A975       CPCAP_REG_CRM_ICHRG(0xb)
 106 #define CPCAP_REG_CRM_ICHRG_1A064       CPCAP_REG_CRM_ICHRG(0xc)
 107 #define CPCAP_REG_CRM_ICHRG_1A152       CPCAP_REG_CRM_ICHRG(0xd)
 108 #define CPCAP_REG_CRM_ICHRG_1A596       CPCAP_REG_CRM_ICHRG(0xe)
 109 #define CPCAP_REG_CRM_ICHRG_NO_LIMIT    CPCAP_REG_CRM_ICHRG(0xf)
 110
 111 /* CPCAP_REG_VUSBC register bits needed for VBUS */
 112 #define CPCAP_BIT_VBUS_SWITCH           BIT(0)  /* VBUS boost to 5V */
 113
 114 enum {
 115         CPCAP_CHARGER_IIO_BATTDET,
 116         CPCAP_CHARGER_IIO_VOLTAGE,
 117         CPCAP_CHARGER_IIO_VBUS,
 118         CPCAP_CHARGER_IIO_CHRG_CURRENT,
 119         CPCAP_CHARGER_IIO_BATT_CURRENT,
 120         CPCAP_CHARGER_IIO_NR,
 121 };
 122
 123 enum {
 124         CPCAP_CHARGER_DISCONNECTED,
 125         CPCAP_CHARGER_DETECTING,
 126         CPCAP_CHARGER_CHARGING,
 127         CPCAP_CHARGER_DONE,
 128 };
 129
 130 struct cpcap_charger_ddata {
 131         struct device *dev;
 132         struct regmap *reg;
 133         struct list_head irq_list;
 134         struct delayed_work detect_work;
 135         struct delayed_work vbus_work;
 136         struct gpio_desc *gpio[2];              /* gpio_reven0 & 1 */
 137
 138         struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
 139
 140         struct power_supply *usb;
 141
 142         struct phy_companion comparator;        /* For USB VBUS */
 143         unsigned int vbus_enabled:1;
 144         unsigned int feeding_vbus:1;
 145         atomic_t active;
 146
 147         int status;
 148         int state;
 149         int voltage;
 150 };
 151
 152 struct cpcap_interrupt_desc {
 153         int irq;
 154         struct list_head node;
 155         const char *name;
 156 };
 157
 158 struct cpcap_charger_ints_state {
 159         bool chrg_det;
 160         bool rvrs_chrg;
 161         bool vbusov;
 162
 163         bool chrg_se1b;
 164         bool rvrs_mode;
 165         bool chrgcurr2;
 166         bool chrgcurr1;
 167         bool vbusvld;
 168
 169         bool battdetb;
 170 };
 171
 172 static enum power_supply_property cpcap_charger_props[] = {
 173         POWER_SUPPLY_PROP_STATUS,
 174         POWER_SUPPLY_PROP_ONLINE,
 175         POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 176         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 177         POWER_SUPPLY_PROP_CURRENT_NOW,
 178 };
 179
 180 /* No battery always shows temperature of -40000 */
 181 static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
 182 {
 183         struct iio_channel *channel;
 184         int error, temperature;
 185
 186         channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
 187         error = iio_read_channel_processed(channel, &temperature);
 188         if (error < 0) {
 189                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 190
 191                 return false;
 192         }
 193
 194         return temperature > -20000 && temperature < 60000;
 195 }
 196
 197 static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
 198 {
 199         struct iio_channel *channel;
 200         int error, value = 0;
 201
 202         channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
 203         error = iio_read_channel_processed(channel, &value);
 204         if (error < 0) {
 205                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 206
 207                 return 0;
 208         }
 209
 210         return value;
 211 }
 212
 213 static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
 214 {
 215         struct iio_channel *channel;
 216         int error, value = 0;
 217
 218         channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
 219         error = iio_read_channel_processed(channel, &value);
 220         if (error < 0) {
 221                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 222
 223                 return 0;
 224         }
 225
 226         return value;
 227 }
 228
 229 static int cpcap_charger_get_property(struct power_supply *psy,
 230                                       enum power_supply_property psp,
 231                                       union power_supply_propval *val)
 232 {
 233         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 234
 235         switch (psp) {
 236         case POWER_SUPPLY_PROP_STATUS:
 237                 val->intval = ddata->status;
 238                 break;
 239         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 240                 val->intval = ddata->voltage;
 241                 break;
 242         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 243                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 244                         val->intval = cpcap_charger_get_charge_voltage(ddata) *
 245                                 1000;
 246                 else
 247                         val->intval = 0;
 248                 break;
 249         case POWER_SUPPLY_PROP_CURRENT_NOW:
 250                 if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
 251                         val->intval = cpcap_charger_get_charge_current(ddata) *
 252                                 1000;
 253                 else
 254                         val->intval = 0;
 255                 break;
 256         case POWER_SUPPLY_PROP_ONLINE:
 257                 val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
 258                 break;
 259         default:
 260                 return -EINVAL;
 261         }
 262
 263         return 0;
 264 }
 265
 266 static int cpcap_charger_match_voltage(int voltage)
 267 {
 268         switch (voltage) {
 269         case 0 ... 4100000 - 1: return 3800000;
 270         case 4100000 ... 4120000 - 1: return 4100000;
 271         case 4120000 ... 4150000 - 1: return 4120000;
 272         case 4150000 ... 4170000 - 1: return 4150000;
 273         case 4170000 ... 4200000 - 1: return 4170000;
 274         case 4200000 ... 4230000 - 1: return 4200000;
 275         case 4230000 ... 4250000 - 1: return 4230000;
 276         case 4250000 ... 4270000 - 1: return 4250000;
 277         case 4270000 ... 4300000 - 1: return 4270000;
 278         case 4300000 ... 4330000 - 1: return 4300000;
 279         case 4330000 ... 4350000 - 1: return 4330000;
 280         case 4350000 ... 4380000 - 1: return 4350000;
 281         case 4380000 ... 4400000 - 1: return 4380000;
 282         case 4400000 ... 4420000 - 1: return 4400000;
 283         case 4420000 ... 4440000 - 1: return 4420000;
 284         case 4440000: return 4440000;
 285         default: return 0;
 286         }
 287 }
 288
 289 static int
 290 cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
 291 {
 292         union power_supply_propval prop;
 293         struct power_supply *battery;
 294         int voltage = ddata->voltage;
 295         int error;
 296
 297         battery = power_supply_get_by_name("battery");
 298         if (battery) {
 299                 error = power_supply_get_property(battery,
 300                                 POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
 301                                 &prop);
 302                 if (!error)
 303                         voltage = prop.intval;
 304         }
 305
 306         return voltage;
 307 }
 308
 309 static int cpcap_charger_set_property(struct power_supply *psy,
 310                                       enum power_supply_property psp,
 311                                       const union power_supply_propval *val)
 312 {
 313         struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
 314         int voltage, batvolt;
 315
 316         switch (psp) {
 317         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 318                 voltage = cpcap_charger_match_voltage(val->intval);
 319                 batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
 320                 if (voltage > batvolt)
 321                         voltage = batvolt;
 322                 ddata->voltage = voltage;
 323                 schedule_delayed_work(&ddata->detect_work, 0);
 324                 break;
 325         default:
 326                 return -EINVAL;
 327         }
 328
 329         return 0;
 330 }
 331
 332 static int cpcap_charger_property_is_writeable(struct power_supply *psy,
 333                                                enum power_supply_property psp)
 334 {
 335         switch (psp) {
 336         case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
 337                 return 1;
 338         default:
 339                 return 0;
 340         }
 341 }
 342
 343 static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
 344                                          bool enabled)
 345 {
 346         if (!ddata->gpio[0])
 347                 return;
 348
 349         gpiod_set_value(ddata->gpio[0], enabled);
 350 }
 351
 352 static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
 353                                              bool enabled)
 354 {
 355         if (!ddata->gpio[1])
 356                 return;
 357
 358         gpiod_set_value(ddata->gpio[1], enabled);
 359 }
 360
 361 static int cpcap_charger_set_state(struct cpcap_charger_ddata *ddata,
 362                                    int max_voltage, int charge_current,
 363                                    int trickle_current)
 364 {
 365         bool enable;
 366         int error;
 367
 368         enable = (charge_current || trickle_current);
 369         dev_dbg(ddata->dev, "%s enable: %i\n", __func__, enable);
 370
 371         if (!enable) {
 372                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 373                                            0x3fff,
 374                                            CPCAP_REG_CRM_FET_OVRD |
 375                                            CPCAP_REG_CRM_FET_CTRL);
 376                 if (error) {
 377                         ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 378                         goto out_err;
 379                 }
 380
 381                 ddata->status = POWER_SUPPLY_STATUS_DISCHARGING;
 382
 383                 return 0;
 384         }
 385
 386         error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
 387                                    CPCAP_REG_CRM_CHRG_LED_EN |
 388                                    trickle_current |
 389                                    CPCAP_REG_CRM_FET_OVRD |
 390                                    CPCAP_REG_CRM_FET_CTRL |
 391                                    max_voltage |
 392                                    charge_current);
 393         if (error) {
 394                 ddata->status = POWER_SUPPLY_STATUS_UNKNOWN;
 395                 goto out_err;
 396         }
 397
 398         ddata->status = POWER_SUPPLY_STATUS_CHARGING;
 399
 400         return 0;
 401
 402 out_err:
 403         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 404
 405         return error;
 406 }
 407
 408 static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
 409 {
 410         int error, value = 0;
 411         struct iio_channel *channel =
 412                 ddata->channels[CPCAP_CHARGER_IIO_VBUS];
 413
 414         error = iio_read_channel_processed(channel, &value);
 415         if (error >= 0)
 416                 return value > 3900 ? true : false;
 417
 418         dev_err(ddata->dev, "error reading VBUS: %i\n", error);
 419
 420         return false;
 421 }
 422
 423 /* VBUS control functions for the USB PHY companion */
 424 static void cpcap_charger_vbus_work(struct work_struct *work)
 425 {
 426         struct cpcap_charger_ddata *ddata;
 427         bool vbus = false;
 428         int error;
 429
 430         ddata = container_of(work, struct cpcap_charger_ddata,
 431                              vbus_work.work);
 432
 433         if (ddata->vbus_enabled) {
 434                 vbus = cpcap_charger_vbus_valid(ddata);
 435                 if (vbus) {
 436                         dev_info(ddata->dev, "VBUS already provided\n");
 437
 438                         return;
 439                 }
 440
 441                 ddata->feeding_vbus = true;
 442                 cpcap_charger_set_cable_path(ddata, false);
 443                 cpcap_charger_set_inductive_path(ddata, false);
 444
 445                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 446                 if (error)
 447                         goto out_err;
 448
 449                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 450                                            CPCAP_BIT_VBUS_SWITCH,
 451                                            CPCAP_BIT_VBUS_SWITCH);
 452                 if (error)
 453                         goto out_err;
 454
 455                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 456                                            CPCAP_REG_CRM_RVRSMODE,
 457                                            CPCAP_REG_CRM_RVRSMODE);
 458                 if (error)
 459                         goto out_err;
 460         } else {
 461                 error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
 462                                            CPCAP_BIT_VBUS_SWITCH, 0);
 463                 if (error)
 464                         goto out_err;
 465
 466                 error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
 467                                            CPCAP_REG_CRM_RVRSMODE, 0);
 468                 if (error)
 469                         goto out_err;
 470
 471                 cpcap_charger_set_cable_path(ddata, true);
 472                 cpcap_charger_set_inductive_path(ddata, true);
 473                 ddata->feeding_vbus = false;
 474         }
 475
 476         return;
 477
 478 out_err:
 479         dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
 480                 ddata->vbus_enabled ? "enable" : "disable", error);
 481 }
 482
 483 static int cpcap_charger_set_vbus(struct phy_companion *comparator,
 484                                   bool enabled)
 485 {
 486         struct cpcap_charger_ddata *ddata =
 487                 container_of(comparator, struct cpcap_charger_ddata,
 488                              comparator);
 489
 490         ddata->vbus_enabled = enabled;
 491         schedule_delayed_work(&ddata->vbus_work, 0);
 492
 493         return 0;
 494 }
 495
 496 /* Charger interrupt handling functions */
 497
 498 static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
 499                                         struct cpcap_charger_ints_state *s)
 500 {
 501         int val, error;
 502
 503         error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
 504         if (error)
 505                 return error;
 506
 507         s->chrg_det = val & BIT(13);
 508         s->rvrs_chrg = val & BIT(12);
 509         s->vbusov = val & BIT(11);
 510
 511         error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
 512         if (error)
 513                 return error;
 514
 515         s->chrg_se1b = val & BIT(13);
 516         s->rvrs_mode = val & BIT(6);
 517         s->chrgcurr2 = val & BIT(5);
 518         s->chrgcurr1 = val & BIT(4);
 519         s->vbusvld = val & BIT(3);
 520
 521         error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
 522         if (error)
 523                 return error;
 524
 525         s->battdetb = val & BIT(6);
 526
 527         return 0;
 528 }
 529
 530 static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
 531                                        int state)
 532 {
 533         const char *status;
 534
 535         if (state > CPCAP_CHARGER_DONE) {
 536                 dev_warn(ddata->dev, "unknown state: %i\n", state);
 537
 538                 return;
 539         }
 540
 541         ddata->state = state;
 542
 543         switch (state) {
 544         case CPCAP_CHARGER_DISCONNECTED:
 545                 status = "DISCONNECTED";
 546                 break;
 547         case CPCAP_CHARGER_DETECTING:
 548                 status = "DETECTING";
 549                 break;
 550         case CPCAP_CHARGER_CHARGING:
 551                 status = "CHARGING";
 552                 break;
 553         case CPCAP_CHARGER_DONE:
 554                 status = "DONE";
 555                 break;
 556         default:
 557                 return;
 558         }
 559
 560         dev_dbg(ddata->dev, "state: %s\n", status);
 561 }
 562
 563 static int cpcap_charger_voltage_to_regval(int voltage)
 564 {
 565         int offset;
 566
 567         switch (voltage) {
 568         case 0 ... 4100000 - 1:
 569                 return 0;
 570         case 4100000 ... 4200000 - 1:
 571                 offset = 1;
 572                 break;
 573         case 4200000 ... 4300000 - 1:
 574                 offset = 0;
 575                 break;
 576         case 4300000 ... 4380000 - 1:
 577                 offset = -1;
 578                 break;
 579         case 4380000 ... 4440000:
 580                 offset = -2;
 581                 break;
 582         default:
 583                 return 0;
 584         }
 585
 586         return ((voltage - 4100000) / 20000) + offset;
 587 }
 588
 589 static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
 590                                      int state, unsigned long delay)
 591 {
 592         int error;
 593
 594         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 595         if (error)
 596                 return;
 597
 598         cpcap_charger_update_state(ddata, state);
 599         power_supply_changed(ddata->usb);
 600         schedule_delayed_work(&ddata->detect_work, delay);
 601 }
 602
 603 static void cpcap_usb_detect(struct work_struct *work)
 604 {
 605         struct cpcap_charger_ddata *ddata;
 606         struct cpcap_charger_ints_state s;
 607         int error;
 608
 609         ddata = container_of(work, struct cpcap_charger_ddata,
 610                              detect_work.work);
 611
 612         error = cpcap_charger_get_ints_state(ddata, &s);
 613         if (error)
 614                 return;
 615
 616         /* Just init the state if a charger is connected with no chrg_det set */
 617         if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
 618                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DETECTING);
 619
 620                 return;
 621         }
 622
 623         /*
 624          * If battery voltage is higher than charge voltage, it may have been
 625          * charged to 4.35V by Android. Try again in 10 minutes.
 626          */
 627         if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
 628                 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
 629                                          HZ * 60 * 10);
 630
 631                 return;
 632         }
 633
 634         /* Throttle chrgcurr2 interrupt for charger done and retry */
 635         switch (ddata->state) {
 636         case CPCAP_CHARGER_CHARGING:
 637                 if (s.chrgcurr2)
 638                         break;
 639                 if (s.chrgcurr1 && s.vbusvld) {
 640                         cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DONE,
 641                                                  HZ * 5);
 642                         return;
 643                 }
 644                 break;
 645         case CPCAP_CHARGER_DONE:
 646                 if (!s.chrgcurr2)
 647                         break;
 648                 cpcap_charger_disconnect(ddata, CPCAP_CHARGER_DETECTING,
 649                                          HZ * 5);
 650                 return;
 651         default:
 652                 break;
 653         }
 654
 655         if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
 656             s.chrgcurr1) {
 657                 int max_current;
 658                 int vchrg;
 659
 660                 if (cpcap_charger_battery_found(ddata))
 661                         max_current = CPCAP_REG_CRM_ICHRG_1A596;
 662                 else
 663                         max_current = CPCAP_REG_CRM_ICHRG_0A532;
 664
 665                 vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
 666                 error = cpcap_charger_set_state(ddata,
 667                                                 CPCAP_REG_CRM_VCHRG(vchrg),
 668                                                 max_current, 0);
 669                 if (error)
 670                         goto out_err;
 671                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_CHARGING);
 672         } else {
 673                 error = cpcap_charger_set_state(ddata, 0, 0, 0);
 674                 if (error)
 675                         goto out_err;
 676                 cpcap_charger_update_state(ddata, CPCAP_CHARGER_DISCONNECTED);
 677         }
 678
 679         power_supply_changed(ddata->usb);
 680         return;
 681
 682 out_err:
 683         dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
 684 }
 685
 686 static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
 687 {
 688         struct cpcap_charger_ddata *ddata = data;
 689
 690         if (!atomic_read(&ddata->active))
 691                 return IRQ_NONE;
 692
 693         schedule_delayed_work(&ddata->detect_work, 0);
 694
 695         return IRQ_HANDLED;
 696 }
 697
 698 static int cpcap_usb_init_irq(struct platform_device *pdev,
 699                               struct cpcap_charger_ddata *ddata,
 700                               const char *name)
 701 {
 702         struct cpcap_interrupt_desc *d;
 703         int irq, error;
 704
 705         irq = platform_get_irq_byname(pdev, name);
 706         if (irq < 0)
 707                 return -ENODEV;
 708
 709         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 710                                           cpcap_charger_irq_thread,
 711                                           IRQF_SHARED,
 712                                           name, ddata);
 713         if (error) {
 714                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 715                         name, error);
 716
 717                 return error;
 718         }
 719
 720         d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 721         if (!d)
 722                 return -ENOMEM;
 723
 724         d->name = name;
 725         d->irq = irq;
 726         list_add(&d->node, &ddata->irq_list);
 727
 728         return 0;
 729 }
 730
 731 static const char * const cpcap_charger_irqs[] = {
 732         /* REG_INT_0 */
 733         "chrg_det", "rvrs_chrg",
 734
 735         /* REG_INT1 */
 736         "chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
 737
 738         /* REG_INT_3 */
 739         "battdetb",
 740 };
 741
 742 static int cpcap_usb_init_interrupts(struct platform_device *pdev,
 743                                      struct cpcap_charger_ddata *ddata)
 744 {
 745         int i, error;
 746
 747         for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
 748                 error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
 749                 if (error)
 750                         return error;
 751         }
 752
 753         return 0;
 754 }
 755
 756 static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
 757 {
 758         int i;
 759
 760         for (i = 0; i < 2; i++) {
 761                 ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
 762                                                       i, GPIOD_OUT_HIGH);
 763                 if (IS_ERR(ddata->gpio[i])) {
 764                         dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
 765                                  i, PTR_ERR(ddata->gpio[i]));
 766                         ddata->gpio[i] = NULL;
 767                 }
 768         }
 769 }
 770
 771 static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
 772 {
 773         const char * const names[CPCAP_CHARGER_IIO_NR] = {
 774                 "battdetb", "battp", "vbus", "chg_isense", "batti",
 775         };
 776         int error, i;
 777
 778         for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
 779                 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 780                                                           names[i]);
 781                 if (IS_ERR(ddata->channels[i])) {
 782                         error = PTR_ERR(ddata->channels[i]);
 783                         goto out_err;
 784                 }
 785
 786                 if (!ddata->channels[i]->indio_dev) {
 787                         error = -ENXIO;
 788                         goto out_err;
 789                 }
 790         }
 791
 792         return 0;
 793
 794 out_err:
 795         if (error != -EPROBE_DEFER)
 796                 dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 797                         error);
 798
 799         return error;
 800 }
 801
 802 static const struct power_supply_desc cpcap_charger_usb_desc = {
 803         .name           = "usb",
 804         .type           = POWER_SUPPLY_TYPE_USB,
 805         .properties     = cpcap_charger_props,
 806         .num_properties = ARRAY_SIZE(cpcap_charger_props),
 807         .get_property   = cpcap_charger_get_property,
 808         .set_property   = cpcap_charger_set_property,
 809         .property_is_writeable = cpcap_charger_property_is_writeable,
 810 };
 811
 812 #ifdef CONFIG_OF
 813 static const struct of_device_id cpcap_charger_id_table[] = {
 814         {
 815                 .compatible = "motorola,mapphone-cpcap-charger",
 816         },
 817         {},
 818 };
 819 MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
 820 #endif
 821
 822 static int cpcap_charger_probe(struct platform_device *pdev)
 823 {
 824         struct cpcap_charger_ddata *ddata;
 825         const struct of_device_id *of_id;
 826         struct power_supply_config psy_cfg = {};
 827         int error;
 828
 829         of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
 830                                 &pdev->dev);
 831         if (!of_id)
 832                 return -EINVAL;
 833
 834         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 835         if (!ddata)
 836                 return -ENOMEM;
 837
 838         ddata->dev = &pdev->dev;
 839         ddata->voltage = 4200000;
 840
 841         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 842         if (!ddata->reg)
 843                 return -ENODEV;
 844
 845         INIT_LIST_HEAD(&ddata->irq_list);
 846         INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
 847         INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
 848         platform_set_drvdata(pdev, ddata);
 849
 850         error = cpcap_charger_init_iio(ddata);
 851         if (error)
 852                 return error;
 853
 854         atomic_set(&ddata->active, 1);
 855
 856         psy_cfg.of_node = pdev->dev.of_node;
 857         psy_cfg.drv_data = ddata;
 858
 859         ddata->usb = devm_power_supply_register(ddata->dev,
 860                                                 &cpcap_charger_usb_desc,
 861                                                 &psy_cfg);
 862         if (IS_ERR(ddata->usb)) {
 863                 error = PTR_ERR(ddata->usb);
 864                 dev_err(ddata->dev, "failed to register USB charger: %i\n",
 865                         error);
 866
 867                 return error;
 868         }
 869
 870         error = cpcap_usb_init_interrupts(pdev, ddata);
 871         if (error)
 872                 return error;
 873
 874         ddata->comparator.set_vbus = cpcap_charger_set_vbus;
 875         error = omap_usb2_set_comparator(&ddata->comparator);
 876         if (error == -ENODEV) {
 877                 dev_info(ddata->dev, "charger needs phy, deferring probe\n");
 878                 return -EPROBE_DEFER;
 879         }
 880
 881         cpcap_charger_init_optional_gpios(ddata);
 882
 883         schedule_delayed_work(&ddata->detect_work, 0);
 884
 885         return 0;
 886 }
 887
 888 static int cpcap_charger_remove(struct platform_device *pdev)
 889 {
 890         struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
 891         int error;
 892
 893         atomic_set(&ddata->active, 0);
 894         error = omap_usb2_set_comparator(NULL);
 895         if (error)
 896                 dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
 897                          error);
 898
 899         error = cpcap_charger_set_state(ddata, 0, 0, 0);
 900         if (error)
 901                 dev_warn(ddata->dev, "could not clear charger: %i\n",
 902                          error);
 903         cancel_delayed_work_sync(&ddata->vbus_work);
 904         cancel_delayed_work_sync(&ddata->detect_work);
 905
 906         return 0;
 907 }
 908
 909 static struct platform_driver cpcap_charger_driver = {
 910         .probe = cpcap_charger_probe,
 911         .driver = {
 912                 .name   = "cpcap-charger",
 913                 .of_match_table = of_match_ptr(cpcap_charger_id_table),
 914         },
 915         .remove = cpcap_charger_remove,
 916 };
 917 module_platform_driver(cpcap_charger_driver);
 918
 919 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 920 MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
 921 MODULE_LICENSE("GPL v2");
 922 MODULE_ALIAS("platform:cpcap-charger");