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1// SPDX-License-Identifier: GPL-2.02/*3 * Fuel gauge driver for CellWise 2013 / 20154 *5 * Copyright (C) 2012, RockChip6 * Copyright (C) 2020, Tobias Schramm7 *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#include <linux/devm-helpers.h>25 26#define CW2015_SIZE_BATINFO 6427 28#define CW2015_RESET_TRIES 529 30#define CW2015_REG_VERSION 0x0031#define CW2015_REG_VCELL 0x0232#define CW2015_REG_SOC 0x0433#define CW2015_REG_RRT_ALERT 0x0634#define CW2015_REG_CONFIG 0x0835#define CW2015_REG_MODE 0x0A36#define CW2015_REG_BATINFO 0x1037 38#define CW2015_MODE_SLEEP_MASK GENMASK(7, 6)39#define CW2015_MODE_SLEEP (0x03 << 6)40#define CW2015_MODE_NORMAL (0x00 << 6)41#define CW2015_MODE_QUICK_START (0x03 << 4)42#define CW2015_MODE_RESTART (0x0f << 0)43 44#define CW2015_CONFIG_UPDATE_FLG (0x01 << 1)45#define CW2015_ATHD(x) ((x) << 3)46#define CW2015_MASK_ATHD GENMASK(7, 3)47#define CW2015_MASK_SOC GENMASK(12, 0)48 49/* reset gauge of no valid state of charge could be polled for 40s */50#define CW2015_BAT_SOC_ERROR_MS (40 * MSEC_PER_SEC)51/* reset gauge if state of charge stuck for half an hour during charging */52#define CW2015_BAT_CHARGING_STUCK_MS (1800 * MSEC_PER_SEC)53 54/* poll interval from CellWise GPL Android driver example */55#define CW2015_DEFAULT_POLL_INTERVAL_MS 800056 57#define CW2015_AVERAGING_SAMPLES 358 59struct cw_battery {60 struct device *dev;61 struct workqueue_struct *battery_workqueue;62 struct delayed_work battery_delay_work;63 struct regmap *regmap;64 struct power_supply *rk_bat;65 struct power_supply_battery_info *battery;66 u8 *bat_profile;67 68 bool charger_attached;69 bool battery_changed;70 71 int soc;72 int voltage_mv;73 int status;74 int time_to_empty;75 int charge_count;76 77 u32 poll_interval_ms;78 u8 alert_level;79 80 unsigned int read_errors;81 unsigned int charge_stuck_cnt;82};83 84static int cw_read_word(struct cw_battery *cw_bat, u8 reg, u16 *val)85{86 __be16 value;87 int ret;88 89 ret = regmap_bulk_read(cw_bat->regmap, reg, &value, sizeof(value));90 if (ret)91 return ret;92 93 *val = be16_to_cpu(value);94 return 0;95}96 97static int cw_update_profile(struct cw_battery *cw_bat)98{99 int ret;100 unsigned int reg_val;101 u8 reset_val;102 103 /* make sure gauge is not in sleep mode */104 ret = regmap_read(cw_bat->regmap, CW2015_REG_MODE, ®_val);105 if (ret)106 return ret;107 108 reset_val = reg_val;109 if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {110 dev_err(cw_bat->dev,111 "Gauge is in sleep mode, can't update battery info\n");112 return -EINVAL;113 }114 115 /* write new battery info */116 ret = regmap_raw_write(cw_bat->regmap, CW2015_REG_BATINFO,117 cw_bat->bat_profile,118 CW2015_SIZE_BATINFO);119 if (ret)120 return ret;121 122 /* set config update flag */123 reg_val |= CW2015_CONFIG_UPDATE_FLG;124 reg_val &= ~CW2015_MASK_ATHD;125 reg_val |= CW2015_ATHD(cw_bat->alert_level);126 ret = regmap_write(cw_bat->regmap, CW2015_REG_CONFIG, reg_val);127 if (ret)128 return ret;129 130 /* reset gauge to apply new battery profile */131 reset_val &= ~CW2015_MODE_RESTART;132 reg_val = reset_val | CW2015_MODE_RESTART;133 ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reg_val);134 if (ret)135 return ret;136 137 /* wait for gauge to reset */138 msleep(20);139 140 /* clear reset flag */141 ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reset_val);142 if (ret)143 return ret;144 145 /* wait for gauge to become ready */146 ret = regmap_read_poll_timeout(cw_bat->regmap, CW2015_REG_SOC,147 reg_val, reg_val <= 100,148 10 * USEC_PER_MSEC, 10 * USEC_PER_SEC);149 if (ret)150 dev_err(cw_bat->dev,151 "Gauge did not become ready after profile upload\n");152 else153 dev_dbg(cw_bat->dev, "Battery profile updated\n");154 155 return ret;156}157 158static int cw_init(struct cw_battery *cw_bat)159{160 int ret;161 unsigned int reg_val = CW2015_MODE_SLEEP;162 163 if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {164 reg_val = CW2015_MODE_NORMAL;165 ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reg_val);166 if (ret)167 return ret;168 }169 170 ret = regmap_read(cw_bat->regmap, CW2015_REG_CONFIG, ®_val);171 if (ret)172 return ret;173 174 if ((reg_val & CW2015_MASK_ATHD) != CW2015_ATHD(cw_bat->alert_level)) {175 dev_dbg(cw_bat->dev, "Setting new alert level\n");176 reg_val &= ~CW2015_MASK_ATHD;177 reg_val |= ~CW2015_ATHD(cw_bat->alert_level);178 ret = regmap_write(cw_bat->regmap, CW2015_REG_CONFIG, reg_val);179 if (ret)180 return ret;181 }182 183 ret = regmap_read(cw_bat->regmap, CW2015_REG_CONFIG, ®_val);184 if (ret)185 return ret;186 187 if (!(reg_val & CW2015_CONFIG_UPDATE_FLG)) {188 dev_dbg(cw_bat->dev,189 "Battery profile not present, uploading battery profile\n");190 if (cw_bat->bat_profile) {191 ret = cw_update_profile(cw_bat);192 if (ret) {193 dev_err(cw_bat->dev,194 "Failed to upload battery profile\n");195 return ret;196 }197 } else {198 dev_warn(cw_bat->dev,199 "No profile specified, continuing without profile\n");200 }201 } else if (cw_bat->bat_profile) {202 u8 bat_info[CW2015_SIZE_BATINFO];203 204 ret = regmap_raw_read(cw_bat->regmap, CW2015_REG_BATINFO,205 bat_info, CW2015_SIZE_BATINFO);206 if (ret) {207 dev_err(cw_bat->dev,208 "Failed to read stored battery profile\n");209 return ret;210 }211 212 if (memcmp(bat_info, cw_bat->bat_profile, CW2015_SIZE_BATINFO)) {213 dev_warn(cw_bat->dev, "Replacing stored battery profile\n");214 ret = cw_update_profile(cw_bat);215 if (ret)216 return ret;217 }218 } else {219 dev_warn(cw_bat->dev,220 "Can't check current battery profile, no profile provided\n");221 }222 223 dev_dbg(cw_bat->dev, "Battery profile configured\n");224 return 0;225}226 227static int cw_power_on_reset(struct cw_battery *cw_bat)228{229 int ret;230 unsigned char reset_val;231 232 reset_val = CW2015_MODE_SLEEP;233 ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reset_val);234 if (ret)235 return ret;236 237 /* wait for gauge to enter sleep */238 msleep(20);239 240 reset_val = CW2015_MODE_NORMAL;241 ret = regmap_write(cw_bat->regmap, CW2015_REG_MODE, reset_val);242 if (ret)243 return ret;244 245 ret = cw_init(cw_bat);246 if (ret)247 return ret;248 return 0;249}250 251#define HYSTERESIS(current, previous, up, down) \252 (((current) < (previous) + (up)) && ((current) > (previous) - (down)))253 254static int cw_get_soc(struct cw_battery *cw_bat)255{256 unsigned int soc;257 int ret;258 259 ret = regmap_read(cw_bat->regmap, CW2015_REG_SOC, &soc);260 if (ret)261 return ret;262 263 if (soc > 100) {264 int max_error_cycles =265 CW2015_BAT_SOC_ERROR_MS / cw_bat->poll_interval_ms;266 267 dev_err(cw_bat->dev, "Invalid SoC %d%%\n", soc);268 cw_bat->read_errors++;269 if (cw_bat->read_errors > max_error_cycles) {270 dev_warn(cw_bat->dev,271 "Too many invalid SoC reports, resetting gauge\n");272 cw_power_on_reset(cw_bat);273 cw_bat->read_errors = 0;274 }275 return cw_bat->soc;276 }277 cw_bat->read_errors = 0;278 279 /* Reset gauge if stuck while charging */280 if (cw_bat->status == POWER_SUPPLY_STATUS_CHARGING && soc == cw_bat->soc) {281 int max_stuck_cycles =282 CW2015_BAT_CHARGING_STUCK_MS / cw_bat->poll_interval_ms;283 284 cw_bat->charge_stuck_cnt++;285 if (cw_bat->charge_stuck_cnt > max_stuck_cycles) {286 dev_warn(cw_bat->dev,287 "SoC stuck @%u%%, resetting gauge\n", soc);288 cw_power_on_reset(cw_bat);289 cw_bat->charge_stuck_cnt = 0;290 }291 } else {292 cw_bat->charge_stuck_cnt = 0;293 }294 295 /* Ignore voltage dips during charge */296 if (cw_bat->charger_attached && HYSTERESIS(soc, cw_bat->soc, 0, 3))297 soc = cw_bat->soc;298 299 /* Ignore voltage spikes during discharge */300 if (!cw_bat->charger_attached && HYSTERESIS(soc, cw_bat->soc, 3, 0))301 soc = cw_bat->soc;302 303 return soc;304}305 306static int cw_get_voltage(struct cw_battery *cw_bat)307{308 int ret, i, voltage_mv;309 u16 reg_val;310 u32 avg = 0;311 312 for (i = 0; i < CW2015_AVERAGING_SAMPLES; i++) {313 ret = cw_read_word(cw_bat, CW2015_REG_VCELL, ®_val);314 if (ret)315 return ret;316 317 avg += reg_val;318 }319 avg /= CW2015_AVERAGING_SAMPLES;320 321 /*322 * 305 uV per ADC step323 * Use 312 / 1024 as efficient approximation of 305 / 1000324 * Negligible error of 0.1%325 */326 voltage_mv = avg * 312 / 1024;327 328 dev_dbg(cw_bat->dev, "Read voltage: %d mV, raw=0x%04x\n",329 voltage_mv, reg_val);330 return voltage_mv;331}332 333static int cw_get_time_to_empty(struct cw_battery *cw_bat)334{335 int ret;336 u16 value16;337 338 ret = cw_read_word(cw_bat, CW2015_REG_RRT_ALERT, &value16);339 if (ret)340 return ret;341 342 return value16 & CW2015_MASK_SOC;343}344 345static void cw_update_charge_status(struct cw_battery *cw_bat)346{347 int ret;348 349 ret = power_supply_am_i_supplied(cw_bat->rk_bat);350 if (ret < 0) {351 dev_warn(cw_bat->dev, "Failed to get supply state: %d\n", ret);352 } else {353 bool charger_attached;354 355 charger_attached = !!ret;356 if (cw_bat->charger_attached != charger_attached) {357 cw_bat->battery_changed = true;358 if (charger_attached)359 cw_bat->charge_count++;360 }361 cw_bat->charger_attached = charger_attached;362 }363}364 365static void cw_update_soc(struct cw_battery *cw_bat)366{367 int soc;368 369 soc = cw_get_soc(cw_bat);370 if (soc < 0)371 dev_err(cw_bat->dev, "Failed to get SoC from gauge: %d\n", soc);372 else if (cw_bat->soc != soc) {373 cw_bat->soc = soc;374 cw_bat->battery_changed = true;375 }376}377 378static void cw_update_voltage(struct cw_battery *cw_bat)379{380 int voltage_mv;381 382 voltage_mv = cw_get_voltage(cw_bat);383 if (voltage_mv < 0)384 dev_err(cw_bat->dev, "Failed to get voltage from gauge: %d\n",385 voltage_mv);386 else387 cw_bat->voltage_mv = voltage_mv;388}389 390static void cw_update_status(struct cw_battery *cw_bat)391{392 int status = POWER_SUPPLY_STATUS_DISCHARGING;393 394 if (cw_bat->charger_attached) {395 if (cw_bat->soc >= 100)396 status = POWER_SUPPLY_STATUS_FULL;397 else398 status = POWER_SUPPLY_STATUS_CHARGING;399 }400 401 if (cw_bat->status != status)402 cw_bat->battery_changed = true;403 cw_bat->status = status;404}405 406static void cw_update_time_to_empty(struct cw_battery *cw_bat)407{408 int time_to_empty;409 410 time_to_empty = cw_get_time_to_empty(cw_bat);411 if (time_to_empty < 0)412 dev_err(cw_bat->dev, "Failed to get time to empty from gauge: %d\n",413 time_to_empty);414 else if (cw_bat->time_to_empty != time_to_empty) {415 cw_bat->time_to_empty = time_to_empty;416 cw_bat->battery_changed = true;417 }418}419 420static void cw_bat_work(struct work_struct *work)421{422 struct delayed_work *delay_work;423 struct cw_battery *cw_bat;424 int ret;425 unsigned int reg_val;426 427 delay_work = to_delayed_work(work);428 cw_bat = container_of(delay_work, struct cw_battery, battery_delay_work);429 ret = regmap_read(cw_bat->regmap, CW2015_REG_MODE, ®_val);430 if (ret) {431 dev_err(cw_bat->dev, "Failed to read mode from gauge: %d\n", ret);432 } else {433 if ((reg_val & CW2015_MODE_SLEEP_MASK) == CW2015_MODE_SLEEP) {434 int i;435 436 for (i = 0; i < CW2015_RESET_TRIES; i++) {437 if (!cw_power_on_reset(cw_bat))438 break;439 }440 }441 cw_update_soc(cw_bat);442 cw_update_voltage(cw_bat);443 cw_update_charge_status(cw_bat);444 cw_update_status(cw_bat);445 cw_update_time_to_empty(cw_bat);446 }447 dev_dbg(cw_bat->dev, "charger_attached = %d\n", cw_bat->charger_attached);448 dev_dbg(cw_bat->dev, "status = %d\n", cw_bat->status);449 dev_dbg(cw_bat->dev, "soc = %d%%\n", cw_bat->soc);450 dev_dbg(cw_bat->dev, "voltage = %dmV\n", cw_bat->voltage_mv);451 452 if (cw_bat->battery_changed)453 power_supply_changed(cw_bat->rk_bat);454 cw_bat->battery_changed = false;455 456 queue_delayed_work(cw_bat->battery_workqueue,457 &cw_bat->battery_delay_work,458 msecs_to_jiffies(cw_bat->poll_interval_ms));459}460 461static bool cw_battery_valid_time_to_empty(struct cw_battery *cw_bat)462{463 return cw_bat->time_to_empty > 0 &&464 cw_bat->time_to_empty < CW2015_MASK_SOC &&465 cw_bat->status == POWER_SUPPLY_STATUS_DISCHARGING;466}467 468static int cw_battery_get_property(struct power_supply *psy,469 enum power_supply_property psp,470 union power_supply_propval *val)471{472 struct cw_battery *cw_bat;473 474 cw_bat = power_supply_get_drvdata(psy);475 switch (psp) {476 case POWER_SUPPLY_PROP_CAPACITY:477 val->intval = cw_bat->soc;478 break;479 480 case POWER_SUPPLY_PROP_STATUS:481 val->intval = cw_bat->status;482 break;483 484 case POWER_SUPPLY_PROP_PRESENT:485 val->intval = !!cw_bat->voltage_mv;486 break;487 488 case POWER_SUPPLY_PROP_VOLTAGE_NOW:489 val->intval = cw_bat->voltage_mv * 1000;490 break;491 492 case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:493 if (cw_battery_valid_time_to_empty(cw_bat))494 val->intval = cw_bat->time_to_empty * 60;495 else496 val->intval = 0;497 break;498 499 case POWER_SUPPLY_PROP_TECHNOLOGY:500 val->intval = POWER_SUPPLY_TECHNOLOGY_LION;501 break;502 503 case POWER_SUPPLY_PROP_CHARGE_COUNTER:504 val->intval = cw_bat->charge_count;505 break;506 507 case POWER_SUPPLY_PROP_CHARGE_FULL:508 case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:509 if (cw_bat->battery->charge_full_design_uah > 0)510 val->intval = cw_bat->battery->charge_full_design_uah;511 else512 val->intval = 0;513 break;514 515 case POWER_SUPPLY_PROP_CHARGE_NOW:516 val->intval = cw_bat->battery->charge_full_design_uah;517 val->intval = val->intval * cw_bat->soc / 100;518 break;519 520 case POWER_SUPPLY_PROP_CURRENT_NOW:521 if (cw_battery_valid_time_to_empty(cw_bat) &&522 cw_bat->battery->charge_full_design_uah > 0) {523 /* calculate remaining capacity */524 val->intval = cw_bat->battery->charge_full_design_uah;525 val->intval = val->intval * cw_bat->soc / 100;526 527 /* estimate current based on time to empty */528 val->intval = 60 * val->intval / cw_bat->time_to_empty;529 } else {530 val->intval = 0;531 }532 533 break;534 535 default:536 break;537 }538 return 0;539}540 541static enum power_supply_property cw_battery_properties[] = {542 POWER_SUPPLY_PROP_CAPACITY,543 POWER_SUPPLY_PROP_STATUS,544 POWER_SUPPLY_PROP_PRESENT,545 POWER_SUPPLY_PROP_VOLTAGE_NOW,546 POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,547 POWER_SUPPLY_PROP_TECHNOLOGY,548 POWER_SUPPLY_PROP_CHARGE_COUNTER,549 POWER_SUPPLY_PROP_CHARGE_FULL,550 POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,551 POWER_SUPPLY_PROP_CHARGE_NOW,552 POWER_SUPPLY_PROP_CURRENT_NOW,553};554 555static const struct power_supply_desc cw2015_bat_desc = {556 .name = "cw2015-battery",557 .type = POWER_SUPPLY_TYPE_BATTERY,558 .properties = cw_battery_properties,559 .num_properties = ARRAY_SIZE(cw_battery_properties),560 .get_property = cw_battery_get_property,561};562 563static int cw2015_parse_properties(struct cw_battery *cw_bat)564{565 struct device *dev = cw_bat->dev;566 int length;567 int ret;568 569 length = device_property_count_u8(dev, "cellwise,battery-profile");570 if (length < 0) {571 dev_warn(cw_bat->dev,572 "No battery-profile found, using current flash contents\n");573 } else if (length != CW2015_SIZE_BATINFO) {574 dev_err(cw_bat->dev, "battery-profile must be %d bytes\n",575 CW2015_SIZE_BATINFO);576 return -EINVAL;577 } else {578 cw_bat->bat_profile = devm_kzalloc(dev, length, GFP_KERNEL);579 if (!cw_bat->bat_profile)580 return -ENOMEM;581 582 ret = device_property_read_u8_array(dev,583 "cellwise,battery-profile",584 cw_bat->bat_profile,585 length);586 if (ret)587 return ret;588 }589 590 ret = device_property_read_u32(dev, "cellwise,monitor-interval-ms",591 &cw_bat->poll_interval_ms);592 if (ret) {593 dev_dbg(cw_bat->dev, "Using default poll interval\n");594 cw_bat->poll_interval_ms = CW2015_DEFAULT_POLL_INTERVAL_MS;595 }596 597 return 0;598}599 600static const struct regmap_range regmap_ranges_rd_yes[] = {601 regmap_reg_range(CW2015_REG_VERSION, CW2015_REG_VERSION),602 regmap_reg_range(CW2015_REG_VCELL, CW2015_REG_CONFIG),603 regmap_reg_range(CW2015_REG_MODE, CW2015_REG_MODE),604 regmap_reg_range(CW2015_REG_BATINFO,605 CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1),606};607 608static const struct regmap_access_table regmap_rd_table = {609 .yes_ranges = regmap_ranges_rd_yes,610 .n_yes_ranges = 4,611};612 613static const struct regmap_range regmap_ranges_wr_yes[] = {614 regmap_reg_range(CW2015_REG_RRT_ALERT, CW2015_REG_CONFIG),615 regmap_reg_range(CW2015_REG_MODE, CW2015_REG_MODE),616 regmap_reg_range(CW2015_REG_BATINFO,617 CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1),618};619 620static const struct regmap_access_table regmap_wr_table = {621 .yes_ranges = regmap_ranges_wr_yes,622 .n_yes_ranges = 3,623};624 625static const struct regmap_range regmap_ranges_vol_yes[] = {626 regmap_reg_range(CW2015_REG_VCELL, CW2015_REG_SOC + 1),627};628 629static const struct regmap_access_table regmap_vol_table = {630 .yes_ranges = regmap_ranges_vol_yes,631 .n_yes_ranges = 1,632};633 634static const struct regmap_config cw2015_regmap_config = {635 .reg_bits = 8,636 .val_bits = 8,637 .rd_table = ®map_rd_table,638 .wr_table = ®map_wr_table,639 .volatile_table = ®map_vol_table,640 .max_register = CW2015_REG_BATINFO + CW2015_SIZE_BATINFO - 1,641};642 643static int cw_bat_probe(struct i2c_client *client)644{645 int ret;646 struct cw_battery *cw_bat;647 struct power_supply_config psy_cfg = { 0 };648 649 cw_bat = devm_kzalloc(&client->dev, sizeof(*cw_bat), GFP_KERNEL);650 if (!cw_bat)651 return -ENOMEM;652 653 i2c_set_clientdata(client, cw_bat);654 cw_bat->dev = &client->dev;655 cw_bat->soc = 1;656 657 ret = cw2015_parse_properties(cw_bat);658 if (ret) {659 dev_err(cw_bat->dev, "Failed to parse cw2015 properties\n");660 return ret;661 }662 663 cw_bat->regmap = devm_regmap_init_i2c(client, &cw2015_regmap_config);664 if (IS_ERR(cw_bat->regmap)) {665 dev_err(cw_bat->dev, "Failed to allocate regmap: %ld\n",666 PTR_ERR(cw_bat->regmap));667 return PTR_ERR(cw_bat->regmap);668 }669 670 ret = cw_init(cw_bat);671 if (ret) {672 dev_err(cw_bat->dev, "Init failed: %d\n", ret);673 return ret;674 }675 676 psy_cfg.drv_data = cw_bat;677 psy_cfg.fwnode = dev_fwnode(cw_bat->dev);678 679 cw_bat->rk_bat = devm_power_supply_register(&client->dev,680 &cw2015_bat_desc,681 &psy_cfg);682 if (IS_ERR(cw_bat->rk_bat)) {683 /* try again if this happens */684 dev_err_probe(&client->dev, PTR_ERR(cw_bat->rk_bat),685 "Failed to register power supply\n");686 return PTR_ERR(cw_bat->rk_bat);687 }688 689 ret = power_supply_get_battery_info(cw_bat->rk_bat, &cw_bat->battery);690 if (ret) {691 /* Allocate an empty battery */692 cw_bat->battery = devm_kzalloc(&client->dev,693 sizeof(*cw_bat->battery),694 GFP_KERNEL);695 if (!cw_bat->battery)696 return -ENOMEM;697 dev_warn(cw_bat->dev,698 "No monitored battery, some properties will be missing\n");699 }700 701 cw_bat->battery_workqueue = create_singlethread_workqueue("rk_battery");702 if (!cw_bat->battery_workqueue)703 return -ENOMEM;704 705 devm_delayed_work_autocancel(&client->dev,706 &cw_bat->battery_delay_work, cw_bat_work);707 queue_delayed_work(cw_bat->battery_workqueue,708 &cw_bat->battery_delay_work, msecs_to_jiffies(10));709 return 0;710}711 712static int __maybe_unused cw_bat_suspend(struct device *dev)713{714 struct i2c_client *client = to_i2c_client(dev);715 struct cw_battery *cw_bat = i2c_get_clientdata(client);716 717 cancel_delayed_work_sync(&cw_bat->battery_delay_work);718 return 0;719}720 721static int __maybe_unused cw_bat_resume(struct device *dev)722{723 struct i2c_client *client = to_i2c_client(dev);724 struct cw_battery *cw_bat = i2c_get_clientdata(client);725 726 queue_delayed_work(cw_bat->battery_workqueue,727 &cw_bat->battery_delay_work, 0);728 return 0;729}730 731static SIMPLE_DEV_PM_OPS(cw_bat_pm_ops, cw_bat_suspend, cw_bat_resume);732 733static const struct i2c_device_id cw_bat_id_table[] = {734 { "cw2015" },735 { }736};737 738static const struct of_device_id cw2015_of_match[] = {739 { .compatible = "cellwise,cw2015" },740 { }741};742MODULE_DEVICE_TABLE(of, cw2015_of_match);743 744static struct i2c_driver cw_bat_driver = {745 .driver = {746 .name = "cw2015",747 .of_match_table = cw2015_of_match,748 .pm = &cw_bat_pm_ops,749 },750 .probe = cw_bat_probe,751 .id_table = cw_bat_id_table,752};753 754module_i2c_driver(cw_bat_driver);755 756MODULE_AUTHOR("xhc<xhc@rock-chips.com>");757MODULE_AUTHOR("Tobias Schramm <t.schramm@manjaro.org>");758MODULE_DESCRIPTION("cw2015/cw2013 battery driver");759MODULE_LICENSE("GPL");760