drivers/power/supply/cpcap-battery.c

   1 /*
   2  * Battery driver for CPCAP PMIC
   3  *
   4  * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
   5  *
   6  * Some parts of the code based on earlie Motorola mapphone Linux kernel
   7  * drivers:
   8  *
   9  * Copyright (C) 2009-2010 Motorola, Inc.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14
  15  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  16  * kind, whether express or implied; without even the implied warranty
  17  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 #include <linux/delay.h>
  22 #include <linux/err.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/kernel.h>
  25 #include <linux/module.h>
  26 #include <linux/of_device.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/power_supply.h>
  29 #include <linux/reboot.h>
  30 #include <linux/regmap.h>
  31
  32 #include <linux/iio/consumer.h>
  33 #include <linux/iio/types.h>
  34 #include <linux/mfd/motorola-cpcap.h>
  35
  36 #include <asm/div64.h>
  37
  38 /*
  39  * Register bit defines for CPCAP_REG_BPEOL. Some of these seem to
  40  * map to MC13783UG.pdf "Table 5-19. Register 13, Power Control 0"
  41  * to enable BATTDETEN, LOBAT and EOL features. We currently use
  42  * LOBAT interrupts instead of EOL.
  43  */
  44 #define CPCAP_REG_BPEOL_BIT_EOL9        BIT(9)  /* Set for EOL irq */
  45 #define CPCAP_REG_BPEOL_BIT_EOL8        BIT(8)  /* Set for EOL irq */
  46 #define CPCAP_REG_BPEOL_BIT_UNKNOWN7    BIT(7)
  47 #define CPCAP_REG_BPEOL_BIT_UNKNOWN6    BIT(6)
  48 #define CPCAP_REG_BPEOL_BIT_UNKNOWN5    BIT(5)
  49 #define CPCAP_REG_BPEOL_BIT_EOL_MULTI   BIT(4)  /* Set for multiple EOL irqs */
  50 #define CPCAP_REG_BPEOL_BIT_UNKNOWN3    BIT(3)
  51 #define CPCAP_REG_BPEOL_BIT_UNKNOWN2    BIT(2)
  52 #define CPCAP_REG_BPEOL_BIT_BATTDETEN   BIT(1)  /* Enable battery detect */
  53 #define CPCAP_REG_BPEOL_BIT_EOLSEL      BIT(0)  /* BPDET = 0, EOL = 1 */
  54
  55 #define CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS       250
  56
  57 enum {
  58         CPCAP_BATTERY_IIO_BATTDET,
  59         CPCAP_BATTERY_IIO_VOLTAGE,
  60         CPCAP_BATTERY_IIO_CHRG_CURRENT,
  61         CPCAP_BATTERY_IIO_BATT_CURRENT,
  62         CPCAP_BATTERY_IIO_NR,
  63 };
  64
  65 enum cpcap_battery_irq_action {
  66         CPCAP_BATTERY_IRQ_ACTION_NONE,
  67         CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW,
  68         CPCAP_BATTERY_IRQ_ACTION_POWEROFF,
  69 };
  70
  71 struct cpcap_interrupt_desc {
  72         const char *name;
  73         struct list_head node;
  74         int irq;
  75         enum cpcap_battery_irq_action action;
  76 };
  77
  78 struct cpcap_battery_config {
  79         int ccm;
  80         int cd_factor;
  81         struct power_supply_info info;
  82 };
  83
  84 struct cpcap_coulomb_counter_data {
  85         s32 sample;             /* 24-bits */
  86         s32 accumulator;
  87         s16 offset;             /* 10-bits */
  88 };
  89
  90 enum cpcap_battery_state {
  91         CPCAP_BATTERY_STATE_PREVIOUS,
  92         CPCAP_BATTERY_STATE_LATEST,
  93         CPCAP_BATTERY_STATE_NR,
  94 };
  95
  96 struct cpcap_battery_state_data {
  97         int voltage;
  98         int current_ua;
  99         int counter_uah;
 100         int temperature;
 101         ktime_t time;
 102         struct cpcap_coulomb_counter_data cc;
 103 };
 104
 105 struct cpcap_battery_ddata {
 106         struct device *dev;
 107         struct regmap *reg;
 108         struct list_head irq_list;
 109         struct iio_channel *channels[CPCAP_BATTERY_IIO_NR];
 110         struct power_supply *psy;
 111         struct cpcap_battery_config config;
 112         struct cpcap_battery_state_data state[CPCAP_BATTERY_STATE_NR];
 113         atomic_t active;
 114         int status;
 115         u16 vendor;
 116 };
 117
 118 #define CPCAP_NO_BATTERY        -400
 119
 120 static struct cpcap_battery_state_data *
 121 cpcap_battery_get_state(struct cpcap_battery_ddata *ddata,
 122                         enum cpcap_battery_state state)
 123 {
 124         if (state >= CPCAP_BATTERY_STATE_NR)
 125                 return NULL;
 126
 127         return &ddata->state[state];
 128 }
 129
 130 static struct cpcap_battery_state_data *
 131 cpcap_battery_latest(struct cpcap_battery_ddata *ddata)
 132 {
 133         return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_LATEST);
 134 }
 135
 136 static struct cpcap_battery_state_data *
 137 cpcap_battery_previous(struct cpcap_battery_ddata *ddata)
 138 {
 139         return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_PREVIOUS);
 140 }
 141
 142 static int cpcap_charger_battery_temperature(struct cpcap_battery_ddata *ddata,
 143                                              int *value)
 144 {
 145         struct iio_channel *channel;
 146         int error;
 147
 148         channel = ddata->channels[CPCAP_BATTERY_IIO_BATTDET];
 149         error = iio_read_channel_processed(channel, value);
 150         if (error < 0) {
 151                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 152                 *value = CPCAP_NO_BATTERY;
 153
 154                 return error;
 155         }
 156
 157         *value /= 100;
 158
 159         return 0;
 160 }
 161
 162 static int cpcap_battery_get_voltage(struct cpcap_battery_ddata *ddata)
 163 {
 164         struct iio_channel *channel;
 165         int error, value = 0;
 166
 167         channel = ddata->channels[CPCAP_BATTERY_IIO_VOLTAGE];
 168         error = iio_read_channel_processed(channel, &value);
 169         if (error < 0) {
 170                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 171
 172                 return 0;
 173         }
 174
 175         return value * 1000;
 176 }
 177
 178 static int cpcap_battery_get_current(struct cpcap_battery_ddata *ddata)
 179 {
 180         struct iio_channel *channel;
 181         int error, value = 0;
 182
 183         channel = ddata->channels[CPCAP_BATTERY_IIO_BATT_CURRENT];
 184         error = iio_read_channel_processed(channel, &value);
 185         if (error < 0) {
 186                 dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
 187
 188                 return 0;
 189         }
 190
 191         return value * 1000;
 192 }
 193
 194 /**
 195  * cpcap_battery_cc_raw_div - calculate and divide coulomb counter μAms values
 196  * @ddata: device driver data
 197  * @sample: coulomb counter sample value
 198  * @accumulator: coulomb counter integrator value
 199  * @offset: coulomb counter offset value
 200  * @divider: conversion divider
 201  *
 202  * Note that cc_lsb and cc_dur values are from Motorola Linux kernel
 203  * function data_get_avg_curr_ua() and seem to be based on measured test
 204  * results. It also has the following comment:
 205  *
 206  * Adjustment factors are applied here as a temp solution per the test
 207  * results. Need to work out a formal solution for this adjustment.
 208  *
 209  * A coulomb counter for similar hardware seems to be documented in
 210  * "TWL6030 Gas Gauging Basics (Rev. A)" swca095a.pdf in chapter
 211  * "10 Calculating Accumulated Current". We however follow what the
 212  * Motorola mapphone Linux kernel is doing as there may be either a
 213  * TI or ST coulomb counter in the PMIC.
 214  */
 215 static int cpcap_battery_cc_raw_div(struct cpcap_battery_ddata *ddata,
 216                                     u32 sample, s32 accumulator,
 217                                     s16 offset, u32 divider)
 218 {
 219         s64 acc;
 220         u64 tmp;
 221         int avg_current;
 222         u32 cc_lsb;
 223
 224         sample &= 0xffffff;             /* 24-bits, unsigned */
 225         offset &= 0x7ff;                /* 10-bits, signed */
 226
 227         switch (ddata->vendor) {
 228         case CPCAP_VENDOR_ST:
 229                 cc_lsb = 95374;         /* μAms per LSB */
 230                 break;
 231         case CPCAP_VENDOR_TI:
 232                 cc_lsb = 91501;         /* μAms per LSB */
 233                 break;
 234         default:
 235                 return -EINVAL;
 236         }
 237
 238         acc = accumulator;
 239         acc = acc - ((s64)sample * offset);
 240         cc_lsb = (cc_lsb * ddata->config.cd_factor) / 1000;
 241
 242         if (acc >=  0)
 243                 tmp = acc;
 244         else
 245                 tmp = acc * -1;
 246
 247         tmp = tmp * cc_lsb;
 248         do_div(tmp, divider);
 249         avg_current = tmp;
 250
 251         if (acc >= 0)
 252                 return -avg_current;
 253         else
 254                 return avg_current;
 255 }
 256
 257 /* 3600000μAms = 1μAh */
 258 static int cpcap_battery_cc_to_uah(struct cpcap_battery_ddata *ddata,
 259                                    u32 sample, s32 accumulator,
 260                                    s16 offset)
 261 {
 262         return cpcap_battery_cc_raw_div(ddata, sample,
 263                                         accumulator, offset,
 264                                         3600000);
 265 }
 266
 267 static int cpcap_battery_cc_to_ua(struct cpcap_battery_ddata *ddata,
 268                                   u32 sample, s32 accumulator,
 269                                   s16 offset)
 270 {
 271         return cpcap_battery_cc_raw_div(ddata, sample,
 272                                         accumulator, offset,
 273                                         sample *
 274                                         CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS);
 275 }
 276
 277 /**
 278  * cpcap_battery_read_accumulated - reads cpcap coulomb counter
 279  * @ddata: device driver data
 280  * @regs: coulomb counter values
 281  *
 282  * Based on Motorola mapphone kernel function data_read_regs().
 283  * Looking at the registers, the coulomb counter seems similar to
 284  * the coulomb counter in TWL6030. See "TWL6030 Gas Gauging Basics
 285  * (Rev. A) swca095a.pdf for "10 Calculating Accumulated Current".
 286  *
 287  * Note that swca095a.pdf instructs to stop the coulomb counter
 288  * before reading to avoid values changing. Motorola mapphone
 289  * Linux kernel does not do it, so let's assume they've verified
 290  * the data produced is correct.
 291  */
 292 static int
 293 cpcap_battery_read_accumulated(struct cpcap_battery_ddata *ddata,
 294                                struct cpcap_coulomb_counter_data *ccd)
 295 {
 296         u16 buf[7];     /* CPCAP_REG_CC1 to CCI */
 297         int error;
 298
 299         ccd->sample = 0;
 300         ccd->accumulator = 0;
 301         ccd->offset = 0;
 302
 303         /* Read coulomb counter register range */
 304         error = regmap_bulk_read(ddata->reg, CPCAP_REG_CCS1,
 305                                  buf, ARRAY_SIZE(buf));
 306         if (error)
 307                 return 0;
 308
 309         /* Sample value CPCAP_REG_CCS1 & 2 */
 310         ccd->sample = (buf[1] & 0x0fff) << 16;
 311         ccd->sample |= buf[0];
 312
 313         /* Accumulator value CPCAP_REG_CCA1 & 2 */
 314         ccd->accumulator = ((s16)buf[3]) << 16;
 315         ccd->accumulator |= buf[2];
 316
 317         /* Offset value CPCAP_REG_CCO */
 318         ccd->offset = buf[5];
 319
 320         /* Adjust offset based on mode value CPCAP_REG_CCM? */
 321         if (buf[4] >= 0x200)
 322                 ccd->offset |= 0xfc00;
 323
 324         return cpcap_battery_cc_to_uah(ddata,
 325                                        ccd->sample,
 326                                        ccd->accumulator,
 327                                        ccd->offset);
 328 }
 329
 330 /**
 331  * cpcap_battery_cc_get_avg_current - read cpcap coulumb counter
 332  * @ddata: cpcap battery driver device data
 333  */
 334 static int cpcap_battery_cc_get_avg_current(struct cpcap_battery_ddata *ddata)
 335 {
 336         int value, acc, error;
 337         s32 sample = 1;
 338         s16 offset;
 339
 340         if (ddata->vendor == CPCAP_VENDOR_ST)
 341                 sample = 4;
 342
 343         /* Coulomb counter integrator */
 344         error = regmap_read(ddata->reg, CPCAP_REG_CCI, &value);
 345         if (error)
 346                 return error;
 347
 348         if ((ddata->vendor == CPCAP_VENDOR_TI) && (value > 0x2000))
 349                 value = value | 0xc000;
 350
 351         acc = (s16)value;
 352
 353         /* Coulomb counter sample time */
 354         error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value);
 355         if (error)
 356                 return error;
 357
 358         if (value < 0x200)
 359                 offset = value;
 360         else
 361                 offset = value | 0xfc00;
 362
 363         return cpcap_battery_cc_to_ua(ddata, sample, acc, offset);
 364 }
 365
 366 static bool cpcap_battery_full(struct cpcap_battery_ddata *ddata)
 367 {
 368         struct cpcap_battery_state_data *state = cpcap_battery_latest(ddata);
 369
 370         /* Basically anything that measures above 4347000 is full */
 371         if (state->voltage >= (ddata->config.info.voltage_max_design - 4000))
 372                 return true;
 373
 374         return false;
 375 }
 376
 377 static int cpcap_battery_update_status(struct cpcap_battery_ddata *ddata)
 378 {
 379         struct cpcap_battery_state_data state, *latest, *previous;
 380         ktime_t now;
 381         int error;
 382
 383         memset(&state, 0, sizeof(state));
 384         now = ktime_get();
 385
 386         latest = cpcap_battery_latest(ddata);
 387         if (latest) {
 388                 s64 delta_ms = ktime_to_ms(ktime_sub(now, latest->time));
 389
 390                 if (delta_ms < CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS)
 391                         return delta_ms;
 392         }
 393
 394         state.time = now;
 395         state.voltage = cpcap_battery_get_voltage(ddata);
 396         state.current_ua = cpcap_battery_get_current(ddata);
 397         state.counter_uah = cpcap_battery_read_accumulated(ddata, &state.cc);
 398
 399         error = cpcap_charger_battery_temperature(ddata,
 400                                                   &state.temperature);
 401         if (error)
 402                 return error;
 403
 404         previous = cpcap_battery_previous(ddata);
 405         memcpy(previous, latest, sizeof(*previous));
 406         memcpy(latest, &state, sizeof(*latest));
 407
 408         return 0;
 409 }
 410
 411 static enum power_supply_property cpcap_battery_props[] = {
 412         POWER_SUPPLY_PROP_STATUS,
 413         POWER_SUPPLY_PROP_PRESENT,
 414         POWER_SUPPLY_PROP_TECHNOLOGY,
 415         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 416         POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
 417         POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 418         POWER_SUPPLY_PROP_CURRENT_AVG,
 419         POWER_SUPPLY_PROP_CURRENT_NOW,
 420         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 421         POWER_SUPPLY_PROP_CHARGE_COUNTER,
 422         POWER_SUPPLY_PROP_POWER_NOW,
 423         POWER_SUPPLY_PROP_POWER_AVG,
 424         POWER_SUPPLY_PROP_CAPACITY_LEVEL,
 425         POWER_SUPPLY_PROP_SCOPE,
 426         POWER_SUPPLY_PROP_TEMP,
 427 };
 428
 429 static int cpcap_battery_get_property(struct power_supply *psy,
 430                                       enum power_supply_property psp,
 431                                       union power_supply_propval *val)
 432 {
 433         struct cpcap_battery_ddata *ddata = power_supply_get_drvdata(psy);
 434         struct cpcap_battery_state_data *latest, *previous;
 435         u32 sample;
 436         s32 accumulator;
 437         int cached;
 438         s64 tmp;
 439
 440         cached = cpcap_battery_update_status(ddata);
 441         if (cached < 0)
 442                 return cached;
 443
 444         latest = cpcap_battery_latest(ddata);
 445         previous = cpcap_battery_previous(ddata);
 446
 447         switch (psp) {
 448         case POWER_SUPPLY_PROP_PRESENT:
 449                 if (latest->temperature > CPCAP_NO_BATTERY)
 450                         val->intval = 1;
 451                 else
 452                         val->intval = 0;
 453                 break;
 454         case POWER_SUPPLY_PROP_STATUS:
 455                 if (cpcap_battery_full(ddata)) {
 456                         val->intval = POWER_SUPPLY_STATUS_FULL;
 457                         break;
 458                 }
 459                 if (cpcap_battery_cc_get_avg_current(ddata) < 0)
 460                         val->intval = POWER_SUPPLY_STATUS_CHARGING;
 461                 else
 462                         val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
 463                 break;
 464         case POWER_SUPPLY_PROP_TECHNOLOGY:
 465                 val->intval = ddata->config.info.technology;
 466                 break;
 467         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 468                 val->intval = cpcap_battery_get_voltage(ddata);
 469                 break;
 470         case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
 471                 val->intval = ddata->config.info.voltage_max_design;
 472                 break;
 473         case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 474                 val->intval = ddata->config.info.voltage_min_design;
 475                 break;
 476         case POWER_SUPPLY_PROP_CURRENT_AVG:
 477                 if (cached) {
 478                         val->intval = cpcap_battery_cc_get_avg_current(ddata);
 479                         break;
 480                 }
 481                 sample = latest->cc.sample - previous->cc.sample;
 482                 accumulator = latest->cc.accumulator - previous->cc.accumulator;
 483                 val->intval = cpcap_battery_cc_to_ua(ddata, sample,
 484                                                      accumulator,
 485                                                      latest->cc.offset);
 486                 break;
 487         case POWER_SUPPLY_PROP_CURRENT_NOW:
 488                 val->intval = latest->current_ua;
 489                 break;
 490         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 491                 val->intval = latest->counter_uah;
 492                 break;
 493         case POWER_SUPPLY_PROP_POWER_NOW:
 494                 tmp = (latest->voltage / 10000) * latest->current_ua;
 495                 val->intval = div64_s64(tmp, 100);
 496                 break;
 497         case POWER_SUPPLY_PROP_POWER_AVG:
 498                 if (cached) {
 499                         tmp = cpcap_battery_cc_get_avg_current(ddata);
 500                         tmp *= (latest->voltage / 10000);
 501                         val->intval = div64_s64(tmp, 100);
 502                         break;
 503                 }
 504                 sample = latest->cc.sample - previous->cc.sample;
 505                 accumulator = latest->cc.accumulator - previous->cc.accumulator;
 506                 tmp = cpcap_battery_cc_to_ua(ddata, sample, accumulator,
 507                                              latest->cc.offset);
 508                 tmp *= ((latest->voltage + previous->voltage) / 20000);
 509                 val->intval = div64_s64(tmp, 100);
 510                 break;
 511         case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
 512                 if (cpcap_battery_full(ddata))
 513                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
 514                 else if (latest->voltage >= 3750000)
 515                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
 516                 else if (latest->voltage >= 3300000)
 517                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
 518                 else if (latest->voltage > 3100000)
 519                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
 520                 else if (latest->voltage <= 3100000)
 521                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
 522                 else
 523                         val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
 524                 break;
 525         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 526                 val->intval = ddata->config.info.charge_full_design;
 527                 break;
 528         case POWER_SUPPLY_PROP_SCOPE:
 529                 val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
 530                 break;
 531         case POWER_SUPPLY_PROP_TEMP:
 532                 val->intval = latest->temperature;
 533                 break;
 534         default:
 535                 return -EINVAL;
 536         }
 537
 538         return 0;
 539 }
 540
 541 static irqreturn_t cpcap_battery_irq_thread(int irq, void *data)
 542 {
 543         struct cpcap_battery_ddata *ddata = data;
 544         struct cpcap_battery_state_data *latest;
 545         struct cpcap_interrupt_desc *d;
 546
 547         if (!atomic_read(&ddata->active))
 548                 return IRQ_NONE;
 549
 550         list_for_each_entry(d, &ddata->irq_list, node) {
 551                 if (irq == d->irq)
 552                         break;
 553         }
 554
 555         if (!d)
 556                 return IRQ_NONE;
 557
 558         latest = cpcap_battery_latest(ddata);
 559
 560         switch (d->action) {
 561         case CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW:
 562                 if (latest->counter_uah >= 0)
 563                         dev_warn(ddata->dev, "Battery low at 3.3V!\n");
 564                 break;
 565         case CPCAP_BATTERY_IRQ_ACTION_POWEROFF:
 566                 if (latest->counter_uah >= 0) {
 567                         dev_emerg(ddata->dev,
 568                                   "Battery empty at 3.1V, powering off\n");
 569                         orderly_poweroff(true);
 570                 }
 571                 break;
 572         default:
 573                 break;
 574         }
 575
 576         power_supply_changed(ddata->psy);
 577
 578         return IRQ_HANDLED;
 579 }
 580
 581 static int cpcap_battery_init_irq(struct platform_device *pdev,
 582                                   struct cpcap_battery_ddata *ddata,
 583                                   const char *name)
 584 {
 585         struct cpcap_interrupt_desc *d;
 586         int irq, error;
 587
 588         irq = platform_get_irq_byname(pdev, name);
 589         if (irq < 0)
 590                 return irq;
 591
 592         error = devm_request_threaded_irq(ddata->dev, irq, NULL,
 593                                           cpcap_battery_irq_thread,
 594                                           IRQF_SHARED,
 595                                           name, ddata);
 596         if (error) {
 597                 dev_err(ddata->dev, "could not get irq %s: %i\n",
 598                         name, error);
 599
 600                 return error;
 601         }
 602
 603         d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
 604         if (!d)
 605                 return -ENOMEM;
 606
 607         d->name = name;
 608         d->irq = irq;
 609
 610         if (!strncmp(name, "lowbph", 6))
 611                 d->action = CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW;
 612         else if (!strncmp(name, "lowbpl", 6))
 613                 d->action = CPCAP_BATTERY_IRQ_ACTION_POWEROFF;
 614
 615         list_add(&d->node, &ddata->irq_list);
 616
 617         return 0;
 618 }
 619
 620 static int cpcap_battery_init_interrupts(struct platform_device *pdev,
 621                                          struct cpcap_battery_ddata *ddata)
 622 {
 623         static const char * const cpcap_battery_irqs[] = {
 624                 "eol", "lowbph", "lowbpl",
 625                 "chrgcurr1", "battdetb"
 626         };
 627         int i, error;
 628
 629         for (i = 0; i < ARRAY_SIZE(cpcap_battery_irqs); i++) {
 630                 error = cpcap_battery_init_irq(pdev, ddata,
 631                                                cpcap_battery_irqs[i]);
 632                 if (error)
 633                         return error;
 634         }
 635
 636         /* Enable low battery interrupts for 3.3V high and 3.1V low */
 637         error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL,
 638                                    0xffff,
 639                                    CPCAP_REG_BPEOL_BIT_BATTDETEN);
 640         if (error)
 641                 return error;
 642
 643         return 0;
 644 }
 645
 646 static int cpcap_battery_init_iio(struct cpcap_battery_ddata *ddata)
 647 {
 648         const char * const names[CPCAP_BATTERY_IIO_NR] = {
 649                 "battdetb", "battp", "chg_isense", "batti",
 650         };
 651         int error, i;
 652
 653         for (i = 0; i < CPCAP_BATTERY_IIO_NR; i++) {
 654                 ddata->channels[i] = devm_iio_channel_get(ddata->dev,
 655                                                           names[i]);
 656                 if (IS_ERR(ddata->channels[i])) {
 657                         error = PTR_ERR(ddata->channels[i]);
 658                         goto out_err;
 659                 }
 660
 661                 if (!ddata->channels[i]->indio_dev) {
 662                         error = -ENXIO;
 663                         goto out_err;
 664                 }
 665         }
 666
 667         return 0;
 668
 669 out_err:
 670         dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
 671                 error);
 672
 673         return error;
 674 }
 675
 676 /*
 677  * Based on the values from Motorola mapphone Linux kernel. In the
 678  * the Motorola mapphone Linux kernel tree the value for pm_cd_factor
 679  * is passed to the kernel via device tree. If it turns out to be
 680  * something device specific we can consider that too later.
 681  *
 682  * And looking at the battery full and shutdown values for the stock
 683  * kernel on droid 4, full is 4351000 and software initiates shutdown
 684  * at 3078000. The device will die around 2743000.
 685  */
 686 static const struct cpcap_battery_config cpcap_battery_default_data = {
 687         .ccm = 0x3ff,
 688         .cd_factor = 0x3cc,
 689         .info.technology = POWER_SUPPLY_TECHNOLOGY_LION,
 690         .info.voltage_max_design = 4351000,
 691         .info.voltage_min_design = 3100000,
 692         .info.charge_full_design = 1740000,
 693 };
 694
 695 #ifdef CONFIG_OF
 696 static const struct of_device_id cpcap_battery_id_table[] = {
 697         {
 698                 .compatible = "motorola,cpcap-battery",
 699                 .data = &cpcap_battery_default_data,
 700         },
 701         {},
 702 };
 703 MODULE_DEVICE_TABLE(of, cpcap_battery_id_table);
 704 #endif
 705
 706 static int cpcap_battery_probe(struct platform_device *pdev)
 707 {
 708         struct power_supply_desc *psy_desc;
 709         struct cpcap_battery_ddata *ddata;
 710         const struct of_device_id *match;
 711         struct power_supply_config psy_cfg = {};
 712         int error;
 713
 714         match = of_match_device(of_match_ptr(cpcap_battery_id_table),
 715                                 &pdev->dev);
 716         if (!match)
 717                 return -EINVAL;
 718
 719         if (!match->data) {
 720                 dev_err(&pdev->dev, "no configuration data found\n");
 721
 722                 return -ENODEV;
 723         }
 724
 725         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 726         if (!ddata)
 727                 return -ENOMEM;
 728
 729         INIT_LIST_HEAD(&ddata->irq_list);
 730         ddata->dev = &pdev->dev;
 731         memcpy(&ddata->config, match->data, sizeof(ddata->config));
 732
 733         ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
 734         if (!ddata->reg)
 735                 return -ENODEV;
 736
 737         error = cpcap_get_vendor(ddata->dev, ddata->reg, &ddata->vendor);
 738         if (error)
 739                 return error;
 740
 741         platform_set_drvdata(pdev, ddata);
 742
 743         error = regmap_update_bits(ddata->reg, CPCAP_REG_CCM,
 744                                    0xffff, ddata->config.ccm);
 745         if (error)
 746                 return error;
 747
 748         error = cpcap_battery_init_interrupts(pdev, ddata);
 749         if (error)
 750                 return error;
 751
 752         error = cpcap_battery_init_iio(ddata);
 753         if (error)
 754                 return error;
 755
 756         psy_desc = devm_kzalloc(ddata->dev, sizeof(*psy_desc), GFP_KERNEL);
 757         if (!psy_desc)
 758                 return -ENOMEM;
 759
 760         psy_desc->name = "battery",
 761         psy_desc->type = POWER_SUPPLY_TYPE_BATTERY,
 762         psy_desc->properties = cpcap_battery_props,
 763         psy_desc->num_properties = ARRAY_SIZE(cpcap_battery_props),
 764         psy_desc->get_property = cpcap_battery_get_property,
 765
 766         psy_cfg.of_node = pdev->dev.of_node;
 767         psy_cfg.drv_data = ddata;
 768
 769         ddata->psy = devm_power_supply_register(ddata->dev, psy_desc,
 770                                                 &psy_cfg);
 771         error = PTR_ERR_OR_ZERO(ddata->psy);
 772         if (error) {
 773                 dev_err(ddata->dev, "failed to register power supply\n");
 774                 return error;
 775         }
 776
 777         atomic_set(&ddata->active, 1);
 778
 779         return 0;
 780 }
 781
 782 static int cpcap_battery_remove(struct platform_device *pdev)
 783 {
 784         struct cpcap_battery_ddata *ddata = platform_get_drvdata(pdev);
 785         int error;
 786
 787         atomic_set(&ddata->active, 0);
 788         error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL,
 789                                    0xffff, 0);
 790         if (error)
 791                 dev_err(&pdev->dev, "could not disable: %i\n", error);
 792
 793         return 0;
 794 }
 795
 796 static struct platform_driver cpcap_battery_driver = {
 797         .driver = {
 798                 .name           = "cpcap_battery",
 799                 .of_match_table = of_match_ptr(cpcap_battery_id_table),
 800         },
 801         .probe  = cpcap_battery_probe,
 802         .remove = cpcap_battery_remove,
 803 };
 804 module_platform_driver(cpcap_battery_driver);
 805
 806 MODULE_LICENSE("GPL v2");
 807 MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
 808 MODULE_DESCRIPTION("CPCAP PMIC Battery Driver");