drivers/power/supply/cw2015_battery.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Fuel gauge driver for CellWise 2013 / 2015
   4  *
   5  * Copyright (C) 2012, RockChip
   6  * Copyright (C) 2020, Tobias Schramm
   7  *
   8  * Authors: xuhuicong <xhc@rock-chips.com>
   9  * Authors: Tobias Schramm <t.schramm@manjaro.org>
  10  */
  11
  12 #include <linux/bits.h>
  13 #include <linux/delay.h>
  14 #include <linux/i2c.h>
  15 #include <linux/gfp.h>
  16 #include <linux/gpio/consumer.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/power_supply.h>
  20 #include <linux/property.h>
  21 #include <linux/regmap.h>
  22 #include <linux/time.h>
  23 #include <linux/workqueue.h>
  24
  25 #define CW2015_SIZE_BATINFO             64
  26
  27 #define CW2015_RESET_TRIES              5
  28
  29 #define CW2015_REG_VERSION              0x00
  30 #define CW2015_REG_VCELL                0x02
  31 #define CW2015_REG_SOC                  0x04
  32 #define CW2015_REG_RRT_ALERT            0x06
  33 #define CW2015_REG_CONFIG               0x08
  34 #define CW2015_REG_MODE                 0x0A
  35 #define CW2015_REG_BATINFO              0x10
  36
  37 #define CW2015_MODE_SLEEP_MASK          GENMASK(7, 6)
  38 #define CW2015_MODE_SLEEP               (0x03 << 6)
  39 #define CW2015_MODE_NORMAL              (0x00 << 6)
  40 #define CW2015_MODE_QUICK_START         (0x03 << 4)
  41 #define CW2015_MODE_RESTART             (0x0f << 0)
  42
  43 #define CW2015_CONFIG_UPDATE_FLG        (0x01 << 1)
  44 #define CW2015_ATHD(x)                  ((x) << 3)
  45 #define CW2015_MASK_ATHD                GENMASK(7, 3)
  46 #define CW2015_MASK_SOC                 GENMASK(12, 0)
  47
  48 /* reset gauge of no valid state of charge could be polled for 40s */
  49 #define CW2015_BAT_SOC_ERROR_MS         (40 * MSEC_PER_SEC)
  50 /* reset gauge if state of charge stuck for half an hour during charging */
  51 #define CW2015_BAT_CHARGING_STUCK_MS    (1800 * MSEC_PER_SEC)
  52
  53 /* poll interval from CellWise GPL Android driver example */
  54 #define CW2015_DEFAULT_POLL_INTERVAL_MS         8000
  55
  56 #define CW2015_AVERAGING_SAMPLES                3
  57
  58 struct cw_battery {
  59         struct device *dev;
  60         struct workqueue_struct *battery_workqueue;
  61         struct delayed_work battery_delay_work;
  62         struct regmap *regmap;
  63         struct power_supply *rk_bat;
  64         struct power_supply_battery_info battery;
  65         u8 *bat_profile;
  66
  67         bool charger_attached;
  68         bool battery_changed;
  69
  70         int soc;
  71         int voltage_mv;
  72         int status;
  73         int time_to_empty;
  74         int charge_count;
  75
  76         u32 poll_interval_ms;
  77         u8 alert_level;
  78
  79         unsigned int read_errors;
  80         unsigned int charge_stuck_cnt;
  81 };
  82
  83 static int cw_read_word(struct cw_battery *cw_bat, u8 reg, u16 *val)
  84 {
  85         __be16 value;
  86         int ret;
  87
  88         ret = regmap_bulk_read(cw_bat->regmap, reg, &value, sizeof(value));
  89         if (ret)
  90                 return ret;
  91
  92         *val = be16_to_cpu(value);
  93         return 0;
  94 }
  95
  96 static int cw_update_profile(struct cw_battery *cw_bat)
  97 {
  98         int ret;
  99         unsigned int reg_val;
 100         u8 reset_val;
 101
 102         /* make sure gauge is not in sleep mode */
 103         ret = regmap_read(cw_bat->regmap, CW2015_REG_MODE, &reg_val);
 104         if (ret)
 105                 return ret;
 106
 107         reset_val = reg_val;
 108         if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {
 109                 dev_err(cw_bat->dev,
 110                         "Gauge is in sleep mode, can't update battery info\n");
 111                 return -EINVAL;
 112         }
 113
 114         /* write new battery info */
 115         ret = regmap_raw_write(cw_bat->regmap, CW2015_REG_BATINFO,
 116                                cw_bat->bat_profile,
 117                                CW2015_SIZE_BATINFO);
 118         if (ret)
 119                 return ret;
 120
 121         /* set config update flag  */
 122         reg_val |= CW2015_CONFIG_UPDATE_FLG;
 123         reg_val &= ~CW2015_MASK_ATHD;
 124         reg_val |= CW2015_ATHD(cw_bat->alert_level);
 125         ret = regmap_write(cw_bat->regmap, CW2015_REG_CONFIG, reg_val);
 126         if (ret)
 127                 return ret;
 128
 129         /* reset gauge to apply new battery profile */
 130         reset_val &= ~CW2015_MODE_RESTART;
 131         reg_val = reset_val | CW2015_MODE_RESTART;
 132         ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reg_val);
 133         if (ret)
 134                 return ret;
 135
 136         /* wait for gauge to reset */
 137         msleep(20);
 138
 139         /* clear reset flag */
 140         ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reset_val);
 141         if (ret)
 142                 return ret;
 143
 144         /* wait for gauge to become ready */
 145         ret = regmap_read_poll_timeout(cw_bat->regmap, CW2015_REG_SOC,
 146                                        reg_val, reg_val <= 100,
 147                                        10 * USEC_PER_MSEC, 10 * USEC_PER_SEC);
 148         if (ret)
 149                 dev_err(cw_bat->dev,
 150                         "Gauge did not become ready after profile upload\n");
 151         else
 152                 dev_dbg(cw_bat->dev, "Battery profile updated\n");
 153
 154         return ret;
 155 }
 156
 157 static int cw_init(struct cw_battery *cw_bat)
 158 {
 159         int ret;
 160         unsigned int reg_val = CW2015_MODE_SLEEP;
 161
 162         if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {
 163                 reg_val = CW2015_MODE_NORMAL;
 164                 ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reg_val);
 165                 if (ret)
 166                         return ret;
 167         }
 168
 169         ret = regmap_read(cw_bat->regmap, CW2015_REG_CONFIG, &reg_val);
 170         if (ret)
 171                 return ret;
 172
 173         if ((reg_val & CW2015_MASK_ATHD) != CW2015_ATHD(cw_bat->alert_level)) {
 174                 dev_dbg(cw_bat->dev, "Setting new alert level\n");
 175                 reg_val &= ~CW2015_MASK_ATHD;
 176                 reg_val |= ~CW2015_ATHD(cw_bat->alert_level);
 177                 ret = regmap_write(cw_bat->regmap, CW2015_REG_CONFIG, reg_val);
 178                 if (ret)
 179                         return ret;
 180         }
 181
 182         ret = regmap_read(cw_bat->regmap, CW2015_REG_CONFIG, &reg_val);
 183         if (ret)
 184                 return ret;
 185
 186         if (!(reg_val & CW2015_CONFIG_UPDATE_FLG)) {
 187                 dev_dbg(cw_bat->dev,
 188                         "Battery profile not present, uploading battery profile\n");
 189                 if (cw_bat->bat_profile) {
 190                         ret = cw_update_profile(cw_bat);
 191                         if (ret) {
 192                                 dev_err(cw_bat->dev,
 193                                         "Failed to upload battery profile\n");
 194                                 return ret;
 195                         }
 196                 } else {
 197                         dev_warn(cw_bat->dev,
 198                                  "No profile specified, continuing without profile\n");
 199                 }
 200         } else if (cw_bat->bat_profile) {
 201                 u8 bat_info[CW2015_SIZE_BATINFO];
 202
 203                 ret = regmap_raw_read(cw_bat->regmap, CW2015_REG_BATINFO,
 204                                       bat_info, CW2015_SIZE_BATINFO);
 205                 if (ret) {
 206                         dev_err(cw_bat->dev,
 207                                 "Failed to read stored battery profile\n");
 208                         return ret;
 209                 }
 210
 211                 if (memcmp(bat_info, cw_bat->bat_profile, CW2015_SIZE_BATINFO)) {
 212                         dev_warn(cw_bat->dev, "Replacing stored battery profile\n");
 213                         ret = cw_update_profile(cw_bat);
 214                         if (ret)
 215                                 return ret;
 216                 }
 217         } else {
 218                 dev_warn(cw_bat->dev,
 219                          "Can't check current battery profile, no profile provided\n");
 220         }
 221
 222         dev_dbg(cw_bat->dev, "Battery profile configured\n");
 223         return 0;
 224 }
 225
 226 static int cw_power_on_reset(struct cw_battery *cw_bat)
 227 {
 228         int ret;
 229         unsigned char reset_val;
 230
 231         reset_val = CW2015_MODE_SLEEP;
 232         ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reset_val);
 233         if (ret)
 234                 return ret;
 235
 236         /* wait for gauge to enter sleep */
 237         msleep(20);
 238
 239         reset_val = CW2015_MODE_NORMAL;
 240         ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reset_val);
 241         if (ret)
 242                 return ret;
 243
 244         ret = cw_init(cw_bat);
 245         if (ret)
 246                 return ret;
 247         return 0;
 248 }
 249
 250 #define HYSTERESIS(current, previous, up, down) \
 251         (((current) < (previous) + (up)) && ((current) > (previous) - (down)))
 252
 253 static int cw_get_soc(struct cw_battery *cw_bat)
 254 {
 255         unsigned int soc;
 256         int ret;
 257
 258         ret = regmap_read(cw_bat->regmap, CW2015_REG_SOC, &soc);
 259         if (ret)
 260                 return ret;
 261
 262         if (soc > 100) {
 263                 int max_error_cycles =
 264                         CW2015_BAT_SOC_ERROR_MS / cw_bat->poll_interval_ms;
 265
 266                 dev_err(cw_bat->dev, "Invalid SoC %d%%\n", soc);
 267                 cw_bat->read_errors++;
 268                 if (cw_bat->read_errors > max_error_cycles) {
 269                         dev_warn(cw_bat->dev,
 270                                  "Too many invalid SoC reports, resetting gauge\n");
 271                         cw_power_on_reset(cw_bat);
 272                         cw_bat->read_errors = 0;
 273                 }
 274                 return cw_bat->soc;
 275         }
 276         cw_bat->read_errors = 0;
 277
 278         /* Reset gauge if stuck while charging */
 279         if (cw_bat->status == POWER_SUPPLY_STATUS_CHARGING && soc == cw_bat->soc) {
 280                 int max_stuck_cycles =
 281                         CW2015_BAT_CHARGING_STUCK_MS / cw_bat->poll_interval_ms;
 282
 283                 cw_bat->charge_stuck_cnt++;
 284                 if (cw_bat->charge_stuck_cnt > max_stuck_cycles) {
 285                         dev_warn(cw_bat->dev,
 286                                  "SoC stuck @%u%%, resetting gauge\n", soc);
 287                         cw_power_on_reset(cw_bat);
 288                         cw_bat->charge_stuck_cnt = 0;
 289                 }
 290         } else {
 291                 cw_bat->charge_stuck_cnt = 0;
 292         }
 293
 294         /* Ignore voltage dips during charge */
 295         if (cw_bat->charger_attached && HYSTERESIS(soc, cw_bat->soc, 0, 3))
 296                 soc = cw_bat->soc;
 297
 298         /* Ignore voltage spikes during discharge */
 299         if (!cw_bat->charger_attached && HYSTERESIS(soc, cw_bat->soc, 3, 0))
 300                 soc = cw_bat->soc;
 301
 302         return soc;
 303 }
 304
 305 static int cw_get_voltage(struct cw_battery *cw_bat)
 306 {
 307         int ret, i, voltage_mv;
 308         u16 reg_val;
 309         u32 avg = 0;
 310
 311         for (i = 0; i < CW2015_AVERAGING_SAMPLES; i++) {
 312                 ret = cw_read_word(cw_bat, CW2015_REG_VCELL, &reg_val);
 313                 if (ret)
 314                         return ret;
 315
 316                 avg += reg_val;
 317         }
 318         avg /= CW2015_AVERAGING_SAMPLES;
 319
 320         /*
 321          * 305 uV per ADC step
 322          * Use 312 / 1024  as efficient approximation of 305 / 1000
 323          * Negligible error of 0.1%
 324          */
 325         voltage_mv = avg * 312 / 1024;
 326
 327         dev_dbg(cw_bat->dev, "Read voltage: %d mV, raw=0x%04x\n",
 328                 voltage_mv, reg_val);
 329         return voltage_mv;
 330 }
 331
 332 static int cw_get_time_to_empty(struct cw_battery *cw_bat)
 333 {
 334         int ret;
 335         u16 value16;
 336
 337         ret = cw_read_word(cw_bat, CW2015_REG_RRT_ALERT, &value16);
 338         if (ret)
 339                 return ret;
 340
 341         return value16 & CW2015_MASK_SOC;
 342 }
 343
 344 static void cw_update_charge_status(struct cw_battery *cw_bat)
 345 {
 346         int ret;
 347
 348         ret = power_supply_am_i_supplied(cw_bat->rk_bat);
 349         if (ret < 0) {
 350                 dev_warn(cw_bat->dev, "Failed to get supply state: %d\n", ret);
 351         } else {
 352                 bool charger_attached;
 353
 354                 charger_attached = !!ret;
 355                 if (cw_bat->charger_attached != charger_attached) {
 356                         cw_bat->battery_changed = true;
 357                         if (charger_attached)
 358                                 cw_bat->charge_count++;
 359                 }
 360                 cw_bat->charger_attached = charger_attached;
 361         }
 362 }
 363
 364 static void cw_update_soc(struct cw_battery *cw_bat)
 365 {
 366         int soc;
 367
 368         soc = cw_get_soc(cw_bat);
 369         if (soc < 0)
 370                 dev_err(cw_bat->dev, "Failed to get SoC from gauge: %d\n", soc);
 371         else if (cw_bat->soc != soc) {
 372                 cw_bat->soc = soc;
 373                 cw_bat->battery_changed = true;
 374         }
 375 }
 376
 377 static void cw_update_voltage(struct cw_battery *cw_bat)
 378 {
 379         int voltage_mv;
 380
 381         voltage_mv = cw_get_voltage(cw_bat);
 382         if (voltage_mv < 0)
 383                 dev_err(cw_bat->dev, "Failed to get voltage from gauge: %d\n",
 384                         voltage_mv);
 385         else
 386                 cw_bat->voltage_mv = voltage_mv;
 387 }
 388
 389 static void cw_update_status(struct cw_battery *cw_bat)
 390 {
 391         int status = POWER_SUPPLY_STATUS_DISCHARGING;
 392
 393         if (cw_bat->charger_attached) {
 394                 if (cw_bat->soc >= 100)
 395                         status = POWER_SUPPLY_STATUS_FULL;
 396                 else
 397                         status = POWER_SUPPLY_STATUS_CHARGING;
 398         }
 399
 400         if (cw_bat->status != status)
 401                 cw_bat->battery_changed = true;
 402         cw_bat->status = status;
 403 }
 404
 405 static void cw_update_time_to_empty(struct cw_battery *cw_bat)
 406 {
 407         int time_to_empty;
 408
 409         time_to_empty = cw_get_time_to_empty(cw_bat);
 410         if (time_to_empty < 0)
 411                 dev_err(cw_bat->dev, "Failed to get time to empty from gauge: %d\n",
 412                         time_to_empty);
 413         else if (cw_bat->time_to_empty != time_to_empty) {
 414                 cw_bat->time_to_empty = time_to_empty;
 415                 cw_bat->battery_changed = true;
 416         }
 417 }
 418
 419 static void cw_bat_work(struct work_struct *work)
 420 {
 421         struct delayed_work *delay_work;
 422         struct cw_battery *cw_bat;
 423         int ret;
 424         unsigned int reg_val;
 425
 426         delay_work = to_delayed_work(work);
 427         cw_bat = container_of(delay_work, struct cw_battery, battery_delay_work);
 428         ret = regmap_read(cw_bat->regmap, CW2015_REG_MODE, &reg_val);
 429         if (ret) {
 430                 dev_err(cw_bat->dev, "Failed to read mode from gauge: %d\n", ret);
 431         } else {
 432                 if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {
 433                         int i;
 434
 435                         for (i = 0; i < CW2015_RESET_TRIES; i++) {
 436                                 if (!cw_power_on_reset(cw_bat))
 437                                         break;
 438                         }
 439                 }
 440                 cw_update_soc(cw_bat);
 441                 cw_update_voltage(cw_bat);
 442                 cw_update_charge_status(cw_bat);
 443                 cw_update_status(cw_bat);
 444                 cw_update_time_to_empty(cw_bat);
 445         }
 446         dev_dbg(cw_bat->dev, "charger_attached = %d\n", cw_bat->charger_attached);
 447         dev_dbg(cw_bat->dev, "status = %d\n", cw_bat->status);
 448         dev_dbg(cw_bat->dev, "soc = %d%%\n", cw_bat->soc);
 449         dev_dbg(cw_bat->dev, "voltage = %dmV\n", cw_bat->voltage_mv);
 450
 451         if (cw_bat->battery_changed)
 452                 power_supply_changed(cw_bat->rk_bat);
 453         cw_bat->battery_changed = false;
 454
 455         queue_delayed_work(cw_bat->battery_workqueue,
 456                            &cw_bat->battery_delay_work,
 457                            msecs_to_jiffies(cw_bat->poll_interval_ms));
 458 }
 459
 460 static bool cw_battery_valid_time_to_empty(struct cw_battery *cw_bat)
 461 {
 462         return  cw_bat->time_to_empty > 0 &&
 463                 cw_bat->time_to_empty < CW2015_MASK_SOC &&
 464                 cw_bat->status == POWER_SUPPLY_STATUS_DISCHARGING;
 465 }
 466
 467 static int cw_battery_get_property(struct power_supply *psy,
 468                                    enum power_supply_property psp,
 469                                    union power_supply_propval *val)
 470 {
 471         struct cw_battery *cw_bat;
 472
 473         cw_bat = power_supply_get_drvdata(psy);
 474         switch (psp) {
 475         case POWER_SUPPLY_PROP_CAPACITY:
 476                 val->intval = cw_bat->soc;
 477                 break;
 478
 479         case POWER_SUPPLY_PROP_STATUS:
 480                 val->intval = cw_bat->status;
 481                 break;
 482
 483         case POWER_SUPPLY_PROP_PRESENT:
 484                 val->intval = !!cw_bat->voltage_mv;
 485                 break;
 486
 487         case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 488                 val->intval = cw_bat->voltage_mv * 1000;
 489                 break;
 490
 491         case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
 492                 if (cw_battery_valid_time_to_empty(cw_bat))
 493                         val->intval = cw_bat->time_to_empty;
 494                 else
 495                         val->intval = 0;
 496                 break;
 497
 498         case POWER_SUPPLY_PROP_TECHNOLOGY:
 499                 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
 500                 break;
 501
 502         case POWER_SUPPLY_PROP_CHARGE_COUNTER:
 503                 val->intval = cw_bat->charge_count;
 504                 break;
 505
 506         case POWER_SUPPLY_PROP_CHARGE_FULL:
 507         case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
 508                 if (cw_bat->battery.charge_full_design_uah > 0)
 509                         val->intval = cw_bat->battery.charge_full_design_uah;
 510                 else
 511                         val->intval = 0;
 512                 break;
 513
 514         case POWER_SUPPLY_PROP_CURRENT_NOW:
 515                 if (cw_battery_valid_time_to_empty(cw_bat) &&
 516                     cw_bat->battery.charge_full_design_uah > 0) {
 517                         /* calculate remaining capacity */
 518                         val->intval = cw_bat->battery.charge_full_design_uah;
 519                         val->intval = val->intval * cw_bat->soc / 100;
 520
 521                         /* estimate current based on time to empty */
 522                         val->intval = 60 * val->intval / cw_bat->time_to_empty;
 523                 } else {
 524                         val->intval = 0;
 525                 }
 526
 527                 break;
 528
 529         default:
 530                 break;
 531         }
 532         return 0;
 533 }
 534
 535 static enum power_supply_property cw_battery_properties[] = {
 536         POWER_SUPPLY_PROP_CAPACITY,
 537         POWER_SUPPLY_PROP_STATUS,
 538         POWER_SUPPLY_PROP_PRESENT,
 539         POWER_SUPPLY_PROP_VOLTAGE_NOW,
 540         POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
 541         POWER_SUPPLY_PROP_TECHNOLOGY,
 542         POWER_SUPPLY_PROP_CHARGE_COUNTER,
 543         POWER_SUPPLY_PROP_CHARGE_FULL,
 544         POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
 545         POWER_SUPPLY_PROP_CURRENT_NOW,
 546 };
 547
 548 static const struct power_supply_desc cw2015_bat_desc = {
 549         .name           = "cw2015-battery",
 550         .type           = POWER_SUPPLY_TYPE_BATTERY,
 551         .properties     = cw_battery_properties,
 552         .num_properties = ARRAY_SIZE(cw_battery_properties),
 553         .get_property   = cw_battery_get_property,
 554 };
 555
 556 static int cw2015_parse_properties(struct cw_battery *cw_bat)
 557 {
 558         struct device *dev = cw_bat->dev;
 559         int length;
 560         int ret;
 561
 562         length = device_property_count_u8(dev, "cellwise,battery-profile");
 563         if (length < 0) {
 564                 dev_warn(cw_bat->dev,
 565                          "No battery-profile found, using current flash contents\n");
 566         } else if (length != CW2015_SIZE_BATINFO) {
 567                 dev_err(cw_bat->dev, "battery-profile must be %d bytes\n",
 568                         CW2015_SIZE_BATINFO);
 569                 return -EINVAL;
 570         } else {
 571                 cw_bat->bat_profile = devm_kzalloc(dev, length, GFP_KERNEL);
 572                 if (!cw_bat->bat_profile)
 573                         return -ENOMEM;
 574
 575                 ret = device_property_read_u8_array(dev,
 576                                                 "cellwise,battery-profile",
 577                                                 cw_bat->bat_profile,
 578                                                 length);
 579                 if (ret)
 580                         return ret;
 581         }
 582
 583         ret = device_property_read_u32(dev, "cellwise,monitor-interval-ms",
 584                                        &cw_bat->poll_interval_ms);
 585         if (ret) {
 586                 dev_dbg(cw_bat->dev, "Using default poll interval\n");
 587                 cw_bat->poll_interval_ms = CW2015_DEFAULT_POLL_INTERVAL_MS;
 588         }
 589
 590         return 0;
 591 }
 592
 593 static const struct regmap_range regmap_ranges_rd_yes[] = {
 594         regmap_reg_range(CW2015_REG_VERSION, CW2015_REG_VERSION),
 595         regmap_reg_range(CW2015_REG_VCELL, CW2015_REG_CONFIG),
 596         regmap_reg_range(CW2015_REG_MODE, CW2015_REG_MODE),
 597         regmap_reg_range(CW2015_REG_BATINFO,
 598                         CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1),
 599 };
 600
 601 static const struct regmap_access_table regmap_rd_table = {
 602         .yes_ranges = regmap_ranges_rd_yes,
 603         .n_yes_ranges = 4,
 604 };
 605
 606 static const struct regmap_range regmap_ranges_wr_yes[] = {
 607         regmap_reg_range(CW2015_REG_RRT_ALERT, CW2015_REG_CONFIG),
 608         regmap_reg_range(CW2015_REG_MODE, CW2015_REG_MODE),
 609         regmap_reg_range(CW2015_REG_BATINFO,
 610                         CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1),
 611 };
 612
 613 static const struct regmap_access_table regmap_wr_table = {
 614         .yes_ranges = regmap_ranges_wr_yes,
 615         .n_yes_ranges = 3,
 616 };
 617
 618 static const struct regmap_range regmap_ranges_vol_yes[] = {
 619         regmap_reg_range(CW2015_REG_VCELL, CW2015_REG_SOC + 1),
 620 };
 621
 622 static const struct regmap_access_table regmap_vol_table = {
 623         .yes_ranges = regmap_ranges_vol_yes,
 624         .n_yes_ranges = 1,
 625 };
 626
 627 static const struct regmap_config cw2015_regmap_config = {
 628         .reg_bits = 8,
 629         .val_bits = 8,
 630         .rd_table = &regmap_rd_table,
 631         .wr_table = &regmap_wr_table,
 632         .volatile_table = &regmap_vol_table,
 633         .max_register = CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1,
 634 };
 635
 636 static int cw_bat_probe(struct i2c_client *client)
 637 {
 638         int ret;
 639         struct cw_battery *cw_bat;
 640         struct power_supply_config psy_cfg = { 0 };
 641
 642         cw_bat = devm_kzalloc(&client->dev, sizeof(*cw_bat), GFP_KERNEL);
 643         if (!cw_bat)
 644                 return -ENOMEM;
 645
 646         i2c_set_clientdata(client, cw_bat);
 647         cw_bat->dev = &client->dev;
 648         cw_bat->soc = 1;
 649
 650         ret = cw2015_parse_properties(cw_bat);
 651         if (ret) {
 652                 dev_err(cw_bat->dev, "Failed to parse cw2015 properties\n");
 653                 return ret;
 654         }
 655
 656         cw_bat->regmap = devm_regmap_init_i2c(client, &cw2015_regmap_config);
 657         if (IS_ERR(cw_bat->regmap)) {
 658                 dev_err(cw_bat->dev, "Failed to allocate regmap: %ld\n",
 659                         PTR_ERR(cw_bat->regmap));
 660                 return PTR_ERR(cw_bat->regmap);
 661         }
 662
 663         ret = cw_init(cw_bat);
 664         if (ret) {
 665                 dev_err(cw_bat->dev, "Init failed: %d\n", ret);
 666                 return ret;
 667         }
 668
 669         psy_cfg.drv_data = cw_bat;
 670         psy_cfg.fwnode = dev_fwnode(cw_bat->dev);
 671
 672         cw_bat->rk_bat = devm_power_supply_register(&client->dev,
 673                                                     &cw2015_bat_desc,
 674                                                     &psy_cfg);
 675         if (IS_ERR(cw_bat->rk_bat)) {
 676                 dev_err(cw_bat->dev, "Failed to register power supply\n");
 677                 return PTR_ERR(cw_bat->rk_bat);
 678         }
 679
 680         ret = power_supply_get_battery_info(cw_bat->rk_bat, &cw_bat->battery);
 681         if (ret) {
 682                 dev_warn(cw_bat->dev,
 683                          "No monitored battery, some properties will be missing\n");
 684         }
 685
 686         cw_bat->battery_workqueue = create_singlethread_workqueue("rk_battery");
 687         INIT_DELAYED_WORK(&cw_bat->battery_delay_work, cw_bat_work);
 688         queue_delayed_work(cw_bat->battery_workqueue,
 689                            &cw_bat->battery_delay_work, msecs_to_jiffies(10));
 690         return 0;
 691 }
 692
 693 static int __maybe_unused cw_bat_suspend(struct device *dev)
 694 {
 695         struct i2c_client *client = to_i2c_client(dev);
 696         struct cw_battery *cw_bat = i2c_get_clientdata(client);
 697
 698         cancel_delayed_work_sync(&cw_bat->battery_delay_work);
 699         return 0;
 700 }
 701
 702 static int __maybe_unused cw_bat_resume(struct device *dev)
 703 {
 704         struct i2c_client *client = to_i2c_client(dev);
 705         struct cw_battery *cw_bat = i2c_get_clientdata(client);
 706
 707         queue_delayed_work(cw_bat->battery_workqueue,
 708                            &cw_bat->battery_delay_work, 0);
 709         return 0;
 710 }
 711
 712 static SIMPLE_DEV_PM_OPS(cw_bat_pm_ops, cw_bat_suspend, cw_bat_resume);
 713
 714 static int cw_bat_remove(struct i2c_client *client)
 715 {
 716         struct cw_battery *cw_bat = i2c_get_clientdata(client);
 717
 718         cancel_delayed_work_sync(&cw_bat->battery_delay_work);
 719         power_supply_put_battery_info(cw_bat->rk_bat, &cw_bat->battery);
 720         return 0;
 721 }
 722
 723 static const struct i2c_device_id cw_bat_id_table[] = {
 724         { "cw2015", 0 },
 725         { }
 726 };
 727
 728 static const struct of_device_id cw2015_of_match[] = {
 729         { .compatible = "cellwise,cw2015" },
 730         { }
 731 };
 732 MODULE_DEVICE_TABLE(of, cw2015_of_match);
 733
 734 static struct i2c_driver cw_bat_driver = {
 735         .driver = {
 736                 .name = "cw2015",
 737                 .of_match_table = cw2015_of_match,
 738                 .pm = &cw_bat_pm_ops,
 739         },
 740         .probe_new = cw_bat_probe,
 741         .remove = cw_bat_remove,
 742         .id_table = cw_bat_id_table,
 743 };
 744
 745 module_i2c_driver(cw_bat_driver);
 746
 747 MODULE_AUTHOR("xhc<xhc@rock-chips.com>");
 748 MODULE_AUTHOR("Tobias Schramm <t.schramm@manjaro.org>");
 749 MODULE_DESCRIPTION("cw2015/cw2013 battery driver");
 750 MODULE_LICENSE("GPL");