bq24735-charger.c 12 KB

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  1. /*
  2. * Battery charger driver for TI BQ24735
  3. *
  4. * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
  5. *
  6. * This program is free software; you can redistribute it and/or modify
  7. * it under the terms of the GNU General Public License as published by
  8. * the Free Software Foundation;
  9. *
  10. * This program is distributed in the hope that it will be useful, but WITHOUT
  11. * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12. * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13. * more details.
  14. *
  15. * You should have received a copy of the GNU General Public License along
  16. * 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. #include <linux/err.h>
  20. #include <linux/gpio.h>
  21. #include <linux/i2c.h>
  22. #include <linux/init.h>
  23. #include <linux/interrupt.h>
  24. #include <linux/kernel.h>
  25. #include <linux/module.h>
  26. #include <linux/of.h>
  27. #include <linux/gpio/consumer.h>
  28. #include <linux/power_supply.h>
  29. #include <linux/slab.h>
  30. #include <linux/power/bq24735-charger.h>
  31. #define BQ24735_CHG_OPT 0x12
  32. #define BQ24735_CHG_OPT_CHARGE_DISABLE (1 << 0)
  33. #define BQ24735_CHG_OPT_AC_PRESENT (1 << 4)
  34. #define BQ24735_CHARGE_CURRENT 0x14
  35. #define BQ24735_CHARGE_CURRENT_MASK 0x1fc0
  36. #define BQ24735_CHARGE_VOLTAGE 0x15
  37. #define BQ24735_CHARGE_VOLTAGE_MASK 0x7ff0
  38. #define BQ24735_INPUT_CURRENT 0x3f
  39. #define BQ24735_INPUT_CURRENT_MASK 0x1f80
  40. #define BQ24735_MANUFACTURER_ID 0xfe
  41. #define BQ24735_DEVICE_ID 0xff
  42. struct bq24735 {
  43. struct power_supply *charger;
  44. struct power_supply_desc charger_desc;
  45. struct i2c_client *client;
  46. struct bq24735_platform *pdata;
  47. struct mutex lock;
  48. struct gpio_desc *status_gpio;
  49. struct delayed_work poll;
  50. u32 poll_interval;
  51. bool charging;
  52. };
  53. static inline struct bq24735 *to_bq24735(struct power_supply *psy)
  54. {
  55. return power_supply_get_drvdata(psy);
  56. }
  57. static enum power_supply_property bq24735_charger_properties[] = {
  58. POWER_SUPPLY_PROP_STATUS,
  59. POWER_SUPPLY_PROP_ONLINE,
  60. };
  61. static int bq24735_charger_property_is_writeable(struct power_supply *psy,
  62. enum power_supply_property psp)
  63. {
  64. switch (psp) {
  65. case POWER_SUPPLY_PROP_STATUS:
  66. return 1;
  67. default:
  68. break;
  69. }
  70. return 0;
  71. }
  72. static inline int bq24735_write_word(struct i2c_client *client, u8 reg,
  73. u16 value)
  74. {
  75. return i2c_smbus_write_word_data(client, reg, value);
  76. }
  77. static inline int bq24735_read_word(struct i2c_client *client, u8 reg)
  78. {
  79. return i2c_smbus_read_word_data(client, reg);
  80. }
  81. static int bq24735_update_word(struct i2c_client *client, u8 reg,
  82. u16 mask, u16 value)
  83. {
  84. unsigned int tmp;
  85. int ret;
  86. ret = bq24735_read_word(client, reg);
  87. if (ret < 0)
  88. return ret;
  89. tmp = ret & ~mask;
  90. tmp |= value & mask;
  91. return bq24735_write_word(client, reg, tmp);
  92. }
  93. static int bq24735_config_charger(struct bq24735 *charger)
  94. {
  95. struct bq24735_platform *pdata = charger->pdata;
  96. int ret;
  97. u16 value;
  98. if (pdata->ext_control)
  99. return 0;
  100. if (pdata->charge_current) {
  101. value = pdata->charge_current & BQ24735_CHARGE_CURRENT_MASK;
  102. ret = bq24735_write_word(charger->client,
  103. BQ24735_CHARGE_CURRENT, value);
  104. if (ret < 0) {
  105. dev_err(&charger->client->dev,
  106. "Failed to write charger current : %d\n",
  107. ret);
  108. return ret;
  109. }
  110. }
  111. if (pdata->charge_voltage) {
  112. value = pdata->charge_voltage & BQ24735_CHARGE_VOLTAGE_MASK;
  113. ret = bq24735_write_word(charger->client,
  114. BQ24735_CHARGE_VOLTAGE, value);
  115. if (ret < 0) {
  116. dev_err(&charger->client->dev,
  117. "Failed to write charger voltage : %d\n",
  118. ret);
  119. return ret;
  120. }
  121. }
  122. if (pdata->input_current) {
  123. value = pdata->input_current & BQ24735_INPUT_CURRENT_MASK;
  124. ret = bq24735_write_word(charger->client,
  125. BQ24735_INPUT_CURRENT, value);
  126. if (ret < 0) {
  127. dev_err(&charger->client->dev,
  128. "Failed to write input current : %d\n",
  129. ret);
  130. return ret;
  131. }
  132. }
  133. return 0;
  134. }
  135. static inline int bq24735_enable_charging(struct bq24735 *charger)
  136. {
  137. int ret;
  138. if (charger->pdata->ext_control)
  139. return 0;
  140. ret = bq24735_config_charger(charger);
  141. if (ret)
  142. return ret;
  143. return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
  144. BQ24735_CHG_OPT_CHARGE_DISABLE, 0);
  145. }
  146. static inline int bq24735_disable_charging(struct bq24735 *charger)
  147. {
  148. if (charger->pdata->ext_control)
  149. return 0;
  150. return bq24735_update_word(charger->client, BQ24735_CHG_OPT,
  151. BQ24735_CHG_OPT_CHARGE_DISABLE,
  152. BQ24735_CHG_OPT_CHARGE_DISABLE);
  153. }
  154. static bool bq24735_charger_is_present(struct bq24735 *charger)
  155. {
  156. if (charger->status_gpio) {
  157. return !gpiod_get_value_cansleep(charger->status_gpio);
  158. } else {
  159. int ac = 0;
  160. ac = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
  161. if (ac < 0) {
  162. dev_dbg(&charger->client->dev,
  163. "Failed to read charger options : %d\n",
  164. ac);
  165. return false;
  166. }
  167. return (ac & BQ24735_CHG_OPT_AC_PRESENT) ? true : false;
  168. }
  169. return false;
  170. }
  171. static int bq24735_charger_is_charging(struct bq24735 *charger)
  172. {
  173. int ret;
  174. if (!bq24735_charger_is_present(charger))
  175. return 0;
  176. ret = bq24735_read_word(charger->client, BQ24735_CHG_OPT);
  177. if (ret < 0)
  178. return ret;
  179. return !(ret & BQ24735_CHG_OPT_CHARGE_DISABLE);
  180. }
  181. static void bq24735_update(struct bq24735 *charger)
  182. {
  183. mutex_lock(&charger->lock);
  184. if (charger->charging && bq24735_charger_is_present(charger))
  185. bq24735_enable_charging(charger);
  186. else
  187. bq24735_disable_charging(charger);
  188. mutex_unlock(&charger->lock);
  189. power_supply_changed(charger->charger);
  190. }
  191. static irqreturn_t bq24735_charger_isr(int irq, void *devid)
  192. {
  193. struct power_supply *psy = devid;
  194. struct bq24735 *charger = to_bq24735(psy);
  195. bq24735_update(charger);
  196. return IRQ_HANDLED;
  197. }
  198. static void bq24735_poll(struct work_struct *work)
  199. {
  200. struct bq24735 *charger = container_of(work, struct bq24735, poll.work);
  201. bq24735_update(charger);
  202. schedule_delayed_work(&charger->poll,
  203. msecs_to_jiffies(charger->poll_interval));
  204. }
  205. static int bq24735_charger_get_property(struct power_supply *psy,
  206. enum power_supply_property psp,
  207. union power_supply_propval *val)
  208. {
  209. struct bq24735 *charger = to_bq24735(psy);
  210. switch (psp) {
  211. case POWER_SUPPLY_PROP_ONLINE:
  212. val->intval = bq24735_charger_is_present(charger) ? 1 : 0;
  213. break;
  214. case POWER_SUPPLY_PROP_STATUS:
  215. switch (bq24735_charger_is_charging(charger)) {
  216. case 1:
  217. val->intval = POWER_SUPPLY_STATUS_CHARGING;
  218. break;
  219. case 0:
  220. val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  221. break;
  222. default:
  223. val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
  224. break;
  225. }
  226. break;
  227. default:
  228. return -EINVAL;
  229. }
  230. return 0;
  231. }
  232. static int bq24735_charger_set_property(struct power_supply *psy,
  233. enum power_supply_property psp,
  234. const union power_supply_propval *val)
  235. {
  236. struct bq24735 *charger = to_bq24735(psy);
  237. int ret;
  238. switch (psp) {
  239. case POWER_SUPPLY_PROP_STATUS:
  240. switch (val->intval) {
  241. case POWER_SUPPLY_STATUS_CHARGING:
  242. mutex_lock(&charger->lock);
  243. charger->charging = true;
  244. ret = bq24735_enable_charging(charger);
  245. mutex_unlock(&charger->lock);
  246. if (ret)
  247. return ret;
  248. break;
  249. case POWER_SUPPLY_STATUS_DISCHARGING:
  250. case POWER_SUPPLY_STATUS_NOT_CHARGING:
  251. mutex_lock(&charger->lock);
  252. charger->charging = false;
  253. ret = bq24735_disable_charging(charger);
  254. mutex_unlock(&charger->lock);
  255. if (ret)
  256. return ret;
  257. break;
  258. default:
  259. return -EINVAL;
  260. }
  261. power_supply_changed(psy);
  262. break;
  263. default:
  264. return -EPERM;
  265. }
  266. return 0;
  267. }
  268. static struct bq24735_platform *bq24735_parse_dt_data(struct i2c_client *client)
  269. {
  270. struct bq24735_platform *pdata;
  271. struct device_node *np = client->dev.of_node;
  272. u32 val;
  273. int ret;
  274. pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
  275. if (!pdata) {
  276. dev_err(&client->dev,
  277. "Memory alloc for bq24735 pdata failed\n");
  278. return NULL;
  279. }
  280. ret = of_property_read_u32(np, "ti,charge-current", &val);
  281. if (!ret)
  282. pdata->charge_current = val;
  283. ret = of_property_read_u32(np, "ti,charge-voltage", &val);
  284. if (!ret)
  285. pdata->charge_voltage = val;
  286. ret = of_property_read_u32(np, "ti,input-current", &val);
  287. if (!ret)
  288. pdata->input_current = val;
  289. pdata->ext_control = of_property_read_bool(np, "ti,external-control");
  290. return pdata;
  291. }
  292. static int bq24735_charger_probe(struct i2c_client *client,
  293. const struct i2c_device_id *id)
  294. {
  295. int ret;
  296. struct bq24735 *charger;
  297. struct power_supply_desc *supply_desc;
  298. struct power_supply_config psy_cfg = {};
  299. char *name;
  300. charger = devm_kzalloc(&client->dev, sizeof(*charger), GFP_KERNEL);
  301. if (!charger)
  302. return -ENOMEM;
  303. mutex_init(&charger->lock);
  304. charger->charging = true;
  305. charger->pdata = client->dev.platform_data;
  306. if (IS_ENABLED(CONFIG_OF) && !charger->pdata && client->dev.of_node)
  307. charger->pdata = bq24735_parse_dt_data(client);
  308. if (!charger->pdata) {
  309. dev_err(&client->dev, "no platform data provided\n");
  310. return -EINVAL;
  311. }
  312. name = (char *)charger->pdata->name;
  313. if (!name) {
  314. name = devm_kasprintf(&client->dev, GFP_KERNEL,
  315. "bq24735@%s",
  316. dev_name(&client->dev));
  317. if (!name) {
  318. dev_err(&client->dev, "Failed to alloc device name\n");
  319. return -ENOMEM;
  320. }
  321. }
  322. charger->client = client;
  323. supply_desc = &charger->charger_desc;
  324. supply_desc->name = name;
  325. supply_desc->type = POWER_SUPPLY_TYPE_MAINS;
  326. supply_desc->properties = bq24735_charger_properties;
  327. supply_desc->num_properties = ARRAY_SIZE(bq24735_charger_properties);
  328. supply_desc->get_property = bq24735_charger_get_property;
  329. supply_desc->set_property = bq24735_charger_set_property;
  330. supply_desc->property_is_writeable =
  331. bq24735_charger_property_is_writeable;
  332. psy_cfg.supplied_to = charger->pdata->supplied_to;
  333. psy_cfg.num_supplicants = charger->pdata->num_supplicants;
  334. psy_cfg.of_node = client->dev.of_node;
  335. psy_cfg.drv_data = charger;
  336. i2c_set_clientdata(client, charger);
  337. charger->status_gpio = devm_gpiod_get_optional(&client->dev,
  338. "ti,ac-detect",
  339. GPIOD_IN);
  340. if (IS_ERR(charger->status_gpio)) {
  341. ret = PTR_ERR(charger->status_gpio);
  342. dev_err(&client->dev, "Getting gpio failed: %d\n", ret);
  343. return ret;
  344. }
  345. if (bq24735_charger_is_present(charger)) {
  346. ret = bq24735_read_word(client, BQ24735_MANUFACTURER_ID);
  347. if (ret < 0) {
  348. dev_err(&client->dev, "Failed to read manufacturer id : %d\n",
  349. ret);
  350. return ret;
  351. } else if (ret != 0x0040) {
  352. dev_err(&client->dev,
  353. "manufacturer id mismatch. 0x0040 != 0x%04x\n", ret);
  354. return -ENODEV;
  355. }
  356. ret = bq24735_read_word(client, BQ24735_DEVICE_ID);
  357. if (ret < 0) {
  358. dev_err(&client->dev, "Failed to read device id : %d\n", ret);
  359. return ret;
  360. } else if (ret != 0x000B) {
  361. dev_err(&client->dev,
  362. "device id mismatch. 0x000b != 0x%04x\n", ret);
  363. return -ENODEV;
  364. }
  365. ret = bq24735_enable_charging(charger);
  366. if (ret < 0) {
  367. dev_err(&client->dev, "Failed to enable charging\n");
  368. return ret;
  369. }
  370. }
  371. charger->charger = devm_power_supply_register(&client->dev, supply_desc,
  372. &psy_cfg);
  373. if (IS_ERR(charger->charger)) {
  374. ret = PTR_ERR(charger->charger);
  375. dev_err(&client->dev, "Failed to register power supply: %d\n",
  376. ret);
  377. return ret;
  378. }
  379. if (client->irq) {
  380. ret = devm_request_threaded_irq(&client->dev, client->irq,
  381. NULL, bq24735_charger_isr,
  382. IRQF_TRIGGER_RISING |
  383. IRQF_TRIGGER_FALLING |
  384. IRQF_ONESHOT,
  385. supply_desc->name,
  386. charger->charger);
  387. if (ret) {
  388. dev_err(&client->dev,
  389. "Unable to register IRQ %d err %d\n",
  390. client->irq, ret);
  391. return ret;
  392. }
  393. } else {
  394. ret = device_property_read_u32(&client->dev, "poll-interval",
  395. &charger->poll_interval);
  396. if (ret)
  397. return 0;
  398. if (!charger->poll_interval)
  399. return 0;
  400. INIT_DELAYED_WORK(&charger->poll, bq24735_poll);
  401. schedule_delayed_work(&charger->poll,
  402. msecs_to_jiffies(charger->poll_interval));
  403. }
  404. return 0;
  405. }
  406. static int bq24735_charger_remove(struct i2c_client *client)
  407. {
  408. struct bq24735 *charger = i2c_get_clientdata(client);
  409. if (charger->poll_interval)
  410. cancel_delayed_work_sync(&charger->poll);
  411. return 0;
  412. }
  413. static const struct i2c_device_id bq24735_charger_id[] = {
  414. { "bq24735-charger", 0 },
  415. {}
  416. };
  417. MODULE_DEVICE_TABLE(i2c, bq24735_charger_id);
  418. static const struct of_device_id bq24735_match_ids[] = {
  419. { .compatible = "ti,bq24735", },
  420. { /* end */ }
  421. };
  422. MODULE_DEVICE_TABLE(of, bq24735_match_ids);
  423. static struct i2c_driver bq24735_charger_driver = {
  424. .driver = {
  425. .name = "bq24735-charger",
  426. .of_match_table = bq24735_match_ids,
  427. },
  428. .probe = bq24735_charger_probe,
  429. .remove = bq24735_charger_remove,
  430. .id_table = bq24735_charger_id,
  431. };
  432. module_i2c_driver(bq24735_charger_driver);
  433. MODULE_DESCRIPTION("bq24735 battery charging driver");
  434. MODULE_AUTHOR("Darbha Sriharsha <dsriharsha@nvidia.com>");
  435. MODULE_LICENSE("GPL v2");