517 lines · c
1/*2 * Battery charger driver for TI BQ247353 *4 * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.5 *6 * This program is free software; you can redistribute it and/or modify7 * it under the terms of the GNU General Public License as published by8 * the Free Software Foundation;9 *10 * This program is distributed in the hope that it will be useful, but WITHOUT11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for13 * more details.14 *15 * You should have received a copy of the GNU General Public License along16 * with this program; if not, write to the Free Software Foundation, Inc.,17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.18 */19 20#include <linux/devm-helpers.h>21#include <linux/err.h>22#include <linux/i2c.h>23#include <linux/init.h>24#include <linux/interrupt.h>25#include <linux/kernel.h>26#include <linux/module.h>27#include <linux/of.h>28#include <linux/gpio/consumer.h>29#include <linux/power_supply.h>30#include <linux/slab.h>31 32#include <linux/power/bq24735-charger.h>33 34/* BQ24735 available commands and their respective masks */35#define BQ24735_CHARGE_OPT 0x1236#define BQ24735_CHARGE_CURRENT 0x1437#define BQ24735_CHARGE_CURRENT_MASK 0x1fc038#define BQ24735_CHARGE_VOLTAGE 0x1539#define BQ24735_CHARGE_VOLTAGE_MASK 0x7ff040#define BQ24735_INPUT_CURRENT 0x3f41#define BQ24735_INPUT_CURRENT_MASK 0x1f8042#define BQ24735_MANUFACTURER_ID 0xfe43#define BQ24735_DEVICE_ID 0xff44 45/* ChargeOptions bits of interest */46#define BQ24735_CHARGE_OPT_CHG_DISABLE (1 << 0)47#define BQ24735_CHARGE_OPT_AC_PRESENT (1 << 4)48 49struct bq24735 {50 struct power_supply *charger;51 struct power_supply_desc charger_desc;52 struct i2c_client *client;53 struct bq24735_platform *pdata;54 struct mutex lock;55 struct gpio_desc *status_gpio;56 struct delayed_work poll;57 u32 poll_interval;58 bool charging;59};60 61static inline struct bq24735 *to_bq24735(struct power_supply *psy)62{63 return power_supply_get_drvdata(psy);64}65 66static enum power_supply_property bq24735_charger_properties[] = {67 POWER_SUPPLY_PROP_STATUS,68 POWER_SUPPLY_PROP_ONLINE,69};70 71static int bq24735_charger_property_is_writeable(struct power_supply *psy,72 enum power_supply_property psp)73{74 switch (psp) {75 case POWER_SUPPLY_PROP_STATUS:76 return 1;77 default:78 break;79 }80 81 return 0;82}83 84static inline int bq24735_write_word(struct i2c_client *client, u8 reg,85 u16 value)86{87 return i2c_smbus_write_word_data(client, reg, value);88}89 90static inline int bq24735_read_word(struct i2c_client *client, u8 reg)91{92 return i2c_smbus_read_word_data(client, reg);93}94 95static int bq24735_update_word(struct i2c_client *client, u8 reg,96 u16 mask, u16 value)97{98 unsigned int tmp;99 int ret;100 101 ret = bq24735_read_word(client, reg);102 if (ret < 0)103 return ret;104 105 tmp = ret & ~mask;106 tmp |= value & mask;107 108 return bq24735_write_word(client, reg, tmp);109}110 111static int bq24735_config_charger(struct bq24735 *charger)112{113 struct bq24735_platform *pdata = charger->pdata;114 int ret;115 u16 value;116 117 if (pdata->ext_control)118 return 0;119 120 if (pdata->charge_current) {121 value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;122 123 ret = bq24735_write_word(charger->client,124 BQ24735_CHARGE_CURRENT, value);125 if (ret < 0) {126 dev_err(&charger->client->dev,127 "Failed to write charger current : %d\n",128 ret);129 return ret;130 }131 }132 133 if (pdata->charge_voltage) {134 value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK;135 136 ret = bq24735_write_word(charger->client,137 BQ24735_CHARGE_VOLTAGE, value);138 if (ret < 0) {139 dev_err(&charger->client->dev,140 "Failed to write charger voltage : %d\n",141 ret);142 return ret;143 }144 }145 146 if (pdata->input_current) {147 value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK;148 149 ret = bq24735_write_word(charger->client,150 BQ24735_INPUT_CURRENT, value);151 if (ret < 0) {152 dev_err(&charger->client->dev,153 "Failed to write input current : %d\n",154 ret);155 return ret;156 }157 }158 159 return 0;160}161 162static inline int bq24735_enable_charging(struct bq24735 *charger)163{164 int ret;165 166 if (charger->pdata->ext_control)167 return 0;168 169 ret = bq24735_config_charger(charger);170 if (ret)171 return ret;172 173 return bq24735_update_word(charger->client, BQ24735_CHARGE_OPT,174 BQ24735_CHARGE_OPT_CHG_DISABLE, 0);175}176 177static inline int bq24735_disable_charging(struct bq24735 *charger)178{179 if (charger->pdata->ext_control)180 return 0;181 182 return bq24735_update_word(charger->client, BQ24735_CHARGE_OPT,183 BQ24735_CHARGE_OPT_CHG_DISABLE,184 BQ24735_CHARGE_OPT_CHG_DISABLE);185}186 187static bool bq24735_charger_is_present(struct bq24735 *charger)188{189 if (charger->status_gpio) {190 return !gpiod_get_value_cansleep(charger->status_gpio);191 } else {192 int ac = 0;193 194 ac = bq24735_read_word(charger->client, BQ24735_CHARGE_OPT);195 if (ac < 0) {196 dev_dbg(&charger->client->dev,197 "Failed to read charger options : %d\n",198 ac);199 return false;200 }201 return (ac & BQ24735_CHARGE_OPT_AC_PRESENT) ? true : false;202 }203 204 return false;205}206 207static int bq24735_charger_is_charging(struct bq24735 *charger)208{209 int ret;210 211 if (!bq24735_charger_is_present(charger))212 return 0;213 214 ret = bq24735_read_word(charger->client, BQ24735_CHARGE_OPT);215 if (ret < 0)216 return ret;217 218 return !(ret & BQ24735_CHARGE_OPT_CHG_DISABLE);219}220 221static void bq24735_update(struct bq24735 *charger)222{223 mutex_lock(&charger->lock);224 225 if (charger->charging && bq24735_charger_is_present(charger))226 bq24735_enable_charging(charger);227 else228 bq24735_disable_charging(charger);229 230 mutex_unlock(&charger->lock);231 232 power_supply_changed(charger->charger);233}234 235static irqreturn_t bq24735_charger_isr(int irq, void *devid)236{237 struct power_supply *psy = devid;238 struct bq24735 *charger = to_bq24735(psy);239 240 bq24735_update(charger);241 242 return IRQ_HANDLED;243}244 245static void bq24735_poll(struct work_struct *work)246{247 struct bq24735 *charger = container_of(work, struct bq24735, poll.work);248 249 bq24735_update(charger);250 251 schedule_delayed_work(&charger->poll,252 msecs_to_jiffies(charger->poll_interval));253}254 255static int bq24735_charger_get_property(struct power_supply *psy,256 enum power_supply_property psp,257 union power_supply_propval *val)258{259 struct bq24735 *charger = to_bq24735(psy);260 261 switch (psp) {262 case POWER_SUPPLY_PROP_ONLINE:263 val->intval = bq24735_charger_is_present(charger) ? 1 : 0;264 break;265 case POWER_SUPPLY_PROP_STATUS:266 switch (bq24735_charger_is_charging(charger)) {267 case 1:268 val->intval = POWER_SUPPLY_STATUS_CHARGING;269 break;270 case 0:271 val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;272 break;273 default:274 val->intval = POWER_SUPPLY_STATUS_UNKNOWN;275 break;276 }277 break;278 default:279 return -EINVAL;280 }281 282 return 0;283}284 285static int bq24735_charger_set_property(struct power_supply *psy,286 enum power_supply_property psp,287 const union power_supply_propval *val)288{289 struct bq24735 *charger = to_bq24735(psy);290 int ret;291 292 switch (psp) {293 case POWER_SUPPLY_PROP_STATUS:294 switch (val->intval) {295 case POWER_SUPPLY_STATUS_CHARGING:296 mutex_lock(&charger->lock);297 charger->charging = true;298 ret = bq24735_enable_charging(charger);299 mutex_unlock(&charger->lock);300 if (ret)301 return ret;302 break;303 case POWER_SUPPLY_STATUS_DISCHARGING:304 case POWER_SUPPLY_STATUS_NOT_CHARGING:305 mutex_lock(&charger->lock);306 charger->charging = false;307 ret = bq24735_disable_charging(charger);308 mutex_unlock(&charger->lock);309 if (ret)310 return ret;311 break;312 default:313 return -EINVAL;314 }315 power_supply_changed(psy);316 break;317 default:318 return -EPERM;319 }320 321 return 0;322}323 324static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client)325{326 struct bq24735_platform *pdata;327 struct device_node *np = client->dev.of_node;328 u32 val;329 int ret;330 331 pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);332 if (!pdata) {333 dev_err(&client->dev,334 "Memory alloc for bq24735 pdata failed\n");335 return NULL;336 }337 338 ret = of_property_read_u32(np, "ti,charge-current", &val);339 if (!ret)340 pdata->charge_current = val;341 342 ret = of_property_read_u32(np, "ti,charge-voltage", &val);343 if (!ret)344 pdata->charge_voltage = val;345 346 ret = of_property_read_u32(np, "ti,input-current", &val);347 if (!ret)348 pdata->input_current = val;349 350 pdata->ext_control = of_property_read_bool(np, "ti,external-control");351 352 return pdata;353}354 355static int bq24735_charger_probe(struct i2c_client *client)356{357 int ret;358 struct bq24735 *charger;359 struct power_supply_desc *supply_desc;360 struct power_supply_config psy_cfg = {};361 char *name;362 363 charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL);364 if (!charger)365 return -ENOMEM;366 367 mutex_init(&charger->lock);368 charger->charging = true;369 charger->pdata = client->dev.platform_data;370 371 if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)372 charger->pdata = bq24735_parse_dt_data(client);373 374 if (!charger->pdata) {375 dev_err(&client->dev, "no platform data provided\n");376 return -EINVAL;377 }378 379 name = (char *)charger->pdata->name;380 if (!name) {381 name = devm_kasprintf(&client->dev, GFP_KERNEL,382 "bq24735@%s",383 dev_name(&client->dev));384 if (!name) {385 dev_err(&client->dev, "Failed to alloc device name\n");386 return -ENOMEM;387 }388 }389 390 charger->client = client;391 392 supply_desc = &charger->charger_desc;393 394 supply_desc->name = name;395 supply_desc->type = POWER_SUPPLY_TYPE_MAINS;396 supply_desc->properties = bq24735_charger_properties;397 supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties);398 supply_desc->get_property = bq24735_charger_get_property;399 supply_desc->set_property = bq24735_charger_set_property;400 supply_desc->property_is_writeable =401 bq24735_charger_property_is_writeable;402 403 psy_cfg.supplied_to = charger->pdata->supplied_to;404 psy_cfg.num_supplicants = charger->pdata->num_supplicants;405 psy_cfg.of_node = client->dev.of_node;406 psy_cfg.drv_data = charger;407 408 i2c_set_clientdata(client, charger);409 410 charger->status_gpio = devm_gpiod_get_optional(&client->dev,411 "ti,ac-detect",412 GPIOD_IN);413 if (IS_ERR(charger->status_gpio)) {414 ret = PTR_ERR(charger->status_gpio);415 dev_err(&client->dev, "Getting gpio failed: %d\n", ret);416 return ret;417 }418 419 if (bq24735_charger_is_present(charger)) {420 ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);421 if (ret < 0) {422 dev_err(&client->dev, "Failed to read manufacturer id : %d\n",423 ret);424 return ret;425 } else if (ret != 0x0040) {426 dev_err(&client->dev,427 "manufacturer id mismatch. 0x0040 != 0x%04x\n", ret);428 return -ENODEV;429 }430 431 ret = bq24735_read_word(client, BQ24735_DEVICE_ID);432 if (ret < 0) {433 dev_err(&client->dev, "Failed to read device id : %d\n", ret);434 return ret;435 } else if (ret != 0x000B) {436 dev_err(&client->dev,437 "device id mismatch. 0x000b != 0x%04x\n", ret);438 return -ENODEV;439 }440 441 ret = bq24735_enable_charging(charger);442 if (ret < 0) {443 dev_err(&client->dev, "Failed to enable charging\n");444 return ret;445 }446 }447 448 charger->charger = devm_power_supply_register(&client->dev, supply_desc,449 &psy_cfg);450 if (IS_ERR(charger->charger)) {451 ret = PTR_ERR(charger->charger);452 dev_err(&client->dev, "Failed to register power supply: %d\n",453 ret);454 return ret;455 }456 457 if (client->irq) {458 ret = devm_request_threaded_irq(&client->dev, client->irq,459 NULL, bq24735_charger_isr,460 IRQF_TRIGGER_RISING |461 IRQF_TRIGGER_FALLING |462 IRQF_ONESHOT,463 supply_desc->name,464 charger->charger);465 if (ret) {466 dev_err(&client->dev,467 "Unable to register IRQ %d err %d\n",468 client->irq, ret);469 return ret;470 }471 } else {472 ret = device_property_read_u32(&client->dev, "poll-interval",473 &charger->poll_interval);474 if (ret)475 return 0;476 if (!charger->poll_interval)477 return 0;478 479 ret = devm_delayed_work_autocancel(&client->dev, &charger->poll,480 bq24735_poll);481 if (ret)482 return ret;483 484 schedule_delayed_work(&charger->poll,485 msecs_to_jiffies(charger->poll_interval));486 }487 488 return 0;489}490 491static const struct i2c_device_id bq24735_charger_id[] = {492 { "bq24735-charger" },493 {}494};495MODULE_DEVICE_TABLE(i2c, bq24735_charger_id);496 497static const struct of_device_id bq24735_match_ids[] = {498 { .compatible = "ti,bq24735", },499 { /* end */ }500};501MODULE_DEVICE_TABLE(of, bq24735_match_ids);502 503static struct i2c_driver bq24735_charger_driver = {504 .driver = {505 .name = "bq24735-charger",506 .of_match_table = bq24735_match_ids,507 },508 .probe = bq24735_charger_probe,509 .id_table = bq24735_charger_id,510};511 512module_i2c_driver(bq24735_charger_driver);513 514MODULE_DESCRIPTION("bq24735 battery charging driver");515MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>");516MODULE_LICENSE("GPL v2");517