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, ®_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, ®_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, ®_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, ®_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, ®_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_CHARGE_NOW: 515 val->intval = cw_bat->battery->charge_full_design_uah; 516 val->intval = val->intval * cw_bat->soc / 100; 517 break; 518 519 case POWER_SUPPLY_PROP_CURRENT_NOW: 520 if (cw_battery_valid_time_to_empty(cw_bat) && 521 cw_bat->battery->charge_full_design_uah > 0) { 522 /* calculate remaining capacity */ 523 val->intval = cw_bat->battery->charge_full_design_uah; 524 val->intval = val->intval * cw_bat->soc / 100; 525 526 /* estimate current based on time to empty */ 527 val->intval = 60 * val->intval / cw_bat->time_to_empty; 528 } else { 529 val->intval = 0; 530 } 531 532 break; 533 534 default: 535 break; 536 } 537 return 0; 538 } 539 540 static enum power_supply_property cw_battery_properties[] = { 541 POWER_SUPPLY_PROP_CAPACITY, 542 POWER_SUPPLY_PROP_STATUS, 543 POWER_SUPPLY_PROP_PRESENT, 544 POWER_SUPPLY_PROP_VOLTAGE_NOW, 545 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, 546 POWER_SUPPLY_PROP_TECHNOLOGY, 547 POWER_SUPPLY_PROP_CHARGE_COUNTER, 548 POWER_SUPPLY_PROP_CHARGE_FULL, 549 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, 550 POWER_SUPPLY_PROP_CHARGE_NOW, 551 POWER_SUPPLY_PROP_CURRENT_NOW, 552 }; 553 554 static const struct power_supply_desc cw2015_bat_desc = { 555 .name = "cw2015-battery", 556 .type = POWER_SUPPLY_TYPE_BATTERY, 557 .properties = cw_battery_properties, 558 .num_properties = ARRAY_SIZE(cw_battery_properties), 559 .get_property = cw_battery_get_property, 560 }; 561 562 static int cw2015_parse_properties(struct cw_battery *cw_bat) 563 { 564 struct device *dev = cw_bat->dev; 565 int length; 566 int ret; 567 568 length = device_property_count_u8(dev, "cellwise,battery-profile"); 569 if (length < 0) { 570 dev_warn(cw_bat->dev, 571 "No battery-profile found, using current flash contents\n"); 572 } else if (length != CW2015_SIZE_BATINFO) { 573 dev_err(cw_bat->dev, "battery-profile must be %d bytes\n", 574 CW2015_SIZE_BATINFO); 575 return -EINVAL; 576 } else { 577 cw_bat->bat_profile = devm_kzalloc(dev, length, GFP_KERNEL); 578 if (!cw_bat->bat_profile) 579 return -ENOMEM; 580 581 ret = device_property_read_u8_array(dev, 582 "cellwise,battery-profile", 583 cw_bat->bat_profile, 584 length); 585 if (ret) 586 return ret; 587 } 588 589 ret = device_property_read_u32(dev, "cellwise,monitor-interval-ms", 590 &cw_bat->poll_interval_ms); 591 if (ret) { 592 dev_dbg(cw_bat->dev, "Using default poll interval\n"); 593 cw_bat->poll_interval_ms = CW2015_DEFAULT_POLL_INTERVAL_MS; 594 } 595 596 return 0; 597 } 598 599 static const struct regmap_range regmap_ranges_rd_yes[] = { 600 regmap_reg_range(CW2015_REG_VERSION, CW2015_REG_VERSION), 601 regmap_reg_range(CW2015_REG_VCELL, CW2015_REG_CONFIG), 602 regmap_reg_range(CW2015_REG_MODE, CW2015_REG_MODE), 603 regmap_reg_range(CW2015_REG_BATINFO, 604 CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1), 605 }; 606 607 static const struct regmap_access_table regmap_rd_table = { 608 .yes_ranges = regmap_ranges_rd_yes, 609 .n_yes_ranges = 4, 610 }; 611 612 static const struct regmap_range regmap_ranges_wr_yes[] = { 613 regmap_reg_range(CW2015_REG_RRT_ALERT, CW2015_REG_CONFIG), 614 regmap_reg_range(CW2015_REG_MODE, CW2015_REG_MODE), 615 regmap_reg_range(CW2015_REG_BATINFO, 616 CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1), 617 }; 618 619 static const struct regmap_access_table regmap_wr_table = { 620 .yes_ranges = regmap_ranges_wr_yes, 621 .n_yes_ranges = 3, 622 }; 623 624 static const struct regmap_range regmap_ranges_vol_yes[] = { 625 regmap_reg_range(CW2015_REG_VCELL, CW2015_REG_SOC + 1), 626 }; 627 628 static const struct regmap_access_table regmap_vol_table = { 629 .yes_ranges = regmap_ranges_vol_yes, 630 .n_yes_ranges = 1, 631 }; 632 633 static const struct regmap_config cw2015_regmap_config = { 634 .reg_bits = 8, 635 .val_bits = 8, 636 .rd_table = ®map_rd_table, 637 .wr_table = ®map_wr_table, 638 .volatile_table = ®map_vol_table, 639 .max_register = CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1, 640 }; 641 642 static int cw_bat_probe(struct i2c_client *client) 643 { 644 int ret; 645 struct cw_battery *cw_bat; 646 struct power_supply_config psy_cfg = { 0 }; 647 648 cw_bat = devm_kzalloc(&client->dev, sizeof(*cw_bat), GFP_KERNEL); 649 if (!cw_bat) 650 return -ENOMEM; 651 652 i2c_set_clientdata(client, cw_bat); 653 cw_bat->dev = &client->dev; 654 cw_bat->soc = 1; 655 656 ret = cw2015_parse_properties(cw_bat); 657 if (ret) { 658 dev_err(cw_bat->dev, "Failed to parse cw2015 properties\n"); 659 return ret; 660 } 661 662 cw_bat->regmap = devm_regmap_init_i2c(client, &cw2015_regmap_config); 663 if (IS_ERR(cw_bat->regmap)) { 664 dev_err(cw_bat->dev, "Failed to allocate regmap: %ld\n", 665 PTR_ERR(cw_bat->regmap)); 666 return PTR_ERR(cw_bat->regmap); 667 } 668 669 ret = cw_init(cw_bat); 670 if (ret) { 671 dev_err(cw_bat->dev, "Init failed: %d\n", ret); 672 return ret; 673 } 674 675 psy_cfg.drv_data = cw_bat; 676 psy_cfg.fwnode = dev_fwnode(cw_bat->dev); 677 678 cw_bat->rk_bat = devm_power_supply_register(&client->dev, 679 &cw2015_bat_desc, 680 &psy_cfg); 681 if (IS_ERR(cw_bat->rk_bat)) { 682 /* try again if this happens */ 683 dev_err_probe(&client->dev, PTR_ERR(cw_bat->rk_bat), 684 "Failed to register power supply\n"); 685 return PTR_ERR(cw_bat->rk_bat); 686 } 687 688 ret = power_supply_get_battery_info(cw_bat->rk_bat, &cw_bat->battery); 689 if (ret) { 690 /* Allocate an empty battery */ 691 cw_bat->battery = devm_kzalloc(&client->dev, 692 sizeof(*cw_bat->battery), 693 GFP_KERNEL); 694 if (!cw_bat->battery) 695 return -ENOMEM; 696 dev_warn(cw_bat->dev, 697 "No monitored battery, some properties will be missing\n"); 698 } 699 700 cw_bat->battery_workqueue = create_singlethread_workqueue("rk_battery"); 701 INIT_DELAYED_WORK(&cw_bat->battery_delay_work, cw_bat_work); 702 queue_delayed_work(cw_bat->battery_workqueue, 703 &cw_bat->battery_delay_work, msecs_to_jiffies(10)); 704 return 0; 705 } 706 707 static int __maybe_unused cw_bat_suspend(struct device *dev) 708 { 709 struct i2c_client *client = to_i2c_client(dev); 710 struct cw_battery *cw_bat = i2c_get_clientdata(client); 711 712 cancel_delayed_work_sync(&cw_bat->battery_delay_work); 713 return 0; 714 } 715 716 static int __maybe_unused cw_bat_resume(struct device *dev) 717 { 718 struct i2c_client *client = to_i2c_client(dev); 719 struct cw_battery *cw_bat = i2c_get_clientdata(client); 720 721 queue_delayed_work(cw_bat->battery_workqueue, 722 &cw_bat->battery_delay_work, 0); 723 return 0; 724 } 725 726 static SIMPLE_DEV_PM_OPS(cw_bat_pm_ops, cw_bat_suspend, cw_bat_resume); 727 728 static int cw_bat_remove(struct i2c_client *client) 729 { 730 struct cw_battery *cw_bat = i2c_get_clientdata(client); 731 732 cancel_delayed_work_sync(&cw_bat->battery_delay_work); 733 power_supply_put_battery_info(cw_bat->rk_bat, cw_bat->battery); 734 return 0; 735 } 736 737 static const struct i2c_device_id cw_bat_id_table[] = { 738 { "cw2015", 0 }, 739 { } 740 }; 741 742 static const struct of_device_id cw2015_of_match[] = { 743 { .compatible = "cellwise,cw2015" }, 744 { } 745 }; 746 MODULE_DEVICE_TABLE(of, cw2015_of_match); 747 748 static struct i2c_driver cw_bat_driver = { 749 .driver = { 750 .name = "cw2015", 751 .of_match_table = cw2015_of_match, 752 .pm = &cw_bat_pm_ops, 753 }, 754 .probe_new = cw_bat_probe, 755 .remove = cw_bat_remove, 756 .id_table = cw_bat_id_table, 757 }; 758 759 module_i2c_driver(cw_bat_driver); 760 761 MODULE_AUTHOR("xhc<xhc@rock-chips.com>"); 762 MODULE_AUTHOR("Tobias Schramm <t.schramm@manjaro.org>"); 763 MODULE_DESCRIPTION("cw2015/cw2013 battery driver"); 764 MODULE_LICENSE("GPL"); 765