bq2415x_charger.c 46 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * bq2415x charger driver
  4. *
  5. * Copyright (C) 2011-2013 Pali Rohár <pali@kernel.org>
  6. *
  7. * Datasheets:
  8. * https://www.ti.com/product/bq24150
  9. * https://www.ti.com/product/bq24150a
  10. * https://www.ti.com/product/bq24152
  11. * https://www.ti.com/product/bq24153
  12. * https://www.ti.com/product/bq24153a
  13. * https://www.ti.com/product/bq24155
  14. * https://www.ti.com/product/bq24157s
  15. * https://www.ti.com/product/bq24158
  16. */
  17. #include <linux/kernel.h>
  18. #include <linux/module.h>
  19. #include <linux/param.h>
  20. #include <linux/err.h>
  21. #include <linux/workqueue.h>
  22. #include <linux/sysfs.h>
  23. #include <linux/platform_device.h>
  24. #include <linux/power_supply.h>
  25. #include <linux/idr.h>
  26. #include <linux/i2c.h>
  27. #include <linux/slab.h>
  28. #include <linux/acpi.h>
  29. #include <linux/power/bq2415x_charger.h>
  30. /* timeout for resetting chip timer */
  31. #define BQ2415X_TIMER_TIMEOUT 10
  32. #define BQ2415X_REG_STATUS 0x00
  33. #define BQ2415X_REG_CONTROL 0x01
  34. #define BQ2415X_REG_VOLTAGE 0x02
  35. #define BQ2415X_REG_VENDER 0x03
  36. #define BQ2415X_REG_CURRENT 0x04
  37. /* reset state for all registers */
  38. #define BQ2415X_RESET_STATUS BIT(6)
  39. #define BQ2415X_RESET_CONTROL (BIT(4)|BIT(5))
  40. #define BQ2415X_RESET_VOLTAGE (BIT(1)|BIT(3))
  41. #define BQ2415X_RESET_CURRENT (BIT(0)|BIT(3)|BIT(7))
  42. /* status register */
  43. #define BQ2415X_BIT_TMR_RST 7
  44. #define BQ2415X_BIT_OTG 7
  45. #define BQ2415X_BIT_EN_STAT 6
  46. #define BQ2415X_MASK_STAT (BIT(4)|BIT(5))
  47. #define BQ2415X_SHIFT_STAT 4
  48. #define BQ2415X_BIT_BOOST 3
  49. #define BQ2415X_MASK_FAULT (BIT(0)|BIT(1)|BIT(2))
  50. #define BQ2415X_SHIFT_FAULT 0
  51. /* control register */
  52. #define BQ2415X_MASK_LIMIT (BIT(6)|BIT(7))
  53. #define BQ2415X_SHIFT_LIMIT 6
  54. #define BQ2415X_MASK_VLOWV (BIT(4)|BIT(5))
  55. #define BQ2415X_SHIFT_VLOWV 4
  56. #define BQ2415X_BIT_TE 3
  57. #define BQ2415X_BIT_CE 2
  58. #define BQ2415X_BIT_HZ_MODE 1
  59. #define BQ2415X_BIT_OPA_MODE 0
  60. /* voltage register */
  61. #define BQ2415X_MASK_VO (BIT(2)|BIT(3)|BIT(4)|BIT(5)|BIT(6)|BIT(7))
  62. #define BQ2415X_SHIFT_VO 2
  63. #define BQ2415X_BIT_OTG_PL 1
  64. #define BQ2415X_BIT_OTG_EN 0
  65. /* vender register */
  66. #define BQ2415X_MASK_VENDER (BIT(5)|BIT(6)|BIT(7))
  67. #define BQ2415X_SHIFT_VENDER 5
  68. #define BQ2415X_MASK_PN (BIT(3)|BIT(4))
  69. #define BQ2415X_SHIFT_PN 3
  70. #define BQ2415X_MASK_REVISION (BIT(0)|BIT(1)|BIT(2))
  71. #define BQ2415X_SHIFT_REVISION 0
  72. /* current register */
  73. #define BQ2415X_MASK_RESET BIT(7)
  74. #define BQ2415X_MASK_VI_CHRG (BIT(4)|BIT(5)|BIT(6))
  75. #define BQ2415X_SHIFT_VI_CHRG 4
  76. /* N/A BIT(3) */
  77. #define BQ2415X_MASK_VI_TERM (BIT(0)|BIT(1)|BIT(2))
  78. #define BQ2415X_SHIFT_VI_TERM 0
  79. enum bq2415x_command {
  80. BQ2415X_TIMER_RESET,
  81. BQ2415X_OTG_STATUS,
  82. BQ2415X_STAT_PIN_STATUS,
  83. BQ2415X_STAT_PIN_ENABLE,
  84. BQ2415X_STAT_PIN_DISABLE,
  85. BQ2415X_CHARGE_STATUS,
  86. BQ2415X_BOOST_STATUS,
  87. BQ2415X_FAULT_STATUS,
  88. BQ2415X_CHARGE_TERMINATION_STATUS,
  89. BQ2415X_CHARGE_TERMINATION_ENABLE,
  90. BQ2415X_CHARGE_TERMINATION_DISABLE,
  91. BQ2415X_CHARGER_STATUS,
  92. BQ2415X_CHARGER_ENABLE,
  93. BQ2415X_CHARGER_DISABLE,
  94. BQ2415X_HIGH_IMPEDANCE_STATUS,
  95. BQ2415X_HIGH_IMPEDANCE_ENABLE,
  96. BQ2415X_HIGH_IMPEDANCE_DISABLE,
  97. BQ2415X_BOOST_MODE_STATUS,
  98. BQ2415X_BOOST_MODE_ENABLE,
  99. BQ2415X_BOOST_MODE_DISABLE,
  100. BQ2415X_OTG_LEVEL,
  101. BQ2415X_OTG_ACTIVATE_HIGH,
  102. BQ2415X_OTG_ACTIVATE_LOW,
  103. BQ2415X_OTG_PIN_STATUS,
  104. BQ2415X_OTG_PIN_ENABLE,
  105. BQ2415X_OTG_PIN_DISABLE,
  106. BQ2415X_VENDER_CODE,
  107. BQ2415X_PART_NUMBER,
  108. BQ2415X_REVISION,
  109. };
  110. enum bq2415x_chip {
  111. BQUNKNOWN,
  112. BQ24150,
  113. BQ24150A,
  114. BQ24151,
  115. BQ24151A,
  116. BQ24152,
  117. BQ24153,
  118. BQ24153A,
  119. BQ24155,
  120. BQ24156,
  121. BQ24156A,
  122. BQ24157S,
  123. BQ24158,
  124. };
  125. static char *bq2415x_chip_name[] = {
  126. "unknown",
  127. "bq24150",
  128. "bq24150a",
  129. "bq24151",
  130. "bq24151a",
  131. "bq24152",
  132. "bq24153",
  133. "bq24153a",
  134. "bq24155",
  135. "bq24156",
  136. "bq24156a",
  137. "bq24157s",
  138. "bq24158",
  139. };
  140. struct bq2415x_device {
  141. struct device *dev;
  142. struct bq2415x_platform_data init_data;
  143. struct power_supply *charger;
  144. struct power_supply_desc charger_desc;
  145. struct delayed_work work;
  146. struct device_node *notify_node;
  147. struct notifier_block nb;
  148. enum bq2415x_mode reported_mode;/* mode reported by hook function */
  149. enum bq2415x_mode mode; /* currently configured mode */
  150. enum bq2415x_chip chip;
  151. const char *timer_error;
  152. char *model;
  153. char *name;
  154. int autotimer; /* 1 - if driver automatically reset timer, 0 - not */
  155. int automode; /* 1 - enabled, 0 - disabled; -1 - not supported */
  156. int id;
  157. };
  158. /* each registered chip must have unique id */
  159. static DEFINE_IDR(bq2415x_id);
  160. static DEFINE_MUTEX(bq2415x_id_mutex);
  161. static DEFINE_MUTEX(bq2415x_timer_mutex);
  162. static DEFINE_MUTEX(bq2415x_i2c_mutex);
  163. /**** i2c read functions ****/
  164. /* read value from register */
  165. static int bq2415x_i2c_read(struct bq2415x_device *bq, u8 reg)
  166. {
  167. struct i2c_client *client = to_i2c_client(bq->dev);
  168. struct i2c_msg msg[2];
  169. u8 val;
  170. int ret;
  171. if (!client->adapter)
  172. return -ENODEV;
  173. msg[0].addr = client->addr;
  174. msg[0].flags = 0;
  175. msg[0].buf = &reg;
  176. msg[0].len = sizeof(reg);
  177. msg[1].addr = client->addr;
  178. msg[1].flags = I2C_M_RD;
  179. msg[1].buf = &val;
  180. msg[1].len = sizeof(val);
  181. mutex_lock(&bq2415x_i2c_mutex);
  182. ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
  183. mutex_unlock(&bq2415x_i2c_mutex);
  184. if (ret < 0)
  185. return ret;
  186. return val;
  187. }
  188. /* read value from register, apply mask and right shift it */
  189. static int bq2415x_i2c_read_mask(struct bq2415x_device *bq, u8 reg,
  190. u8 mask, u8 shift)
  191. {
  192. int ret;
  193. if (shift > 8)
  194. return -EINVAL;
  195. ret = bq2415x_i2c_read(bq, reg);
  196. if (ret < 0)
  197. return ret;
  198. return (ret & mask) >> shift;
  199. }
  200. /* read value from register and return one specified bit */
  201. static int bq2415x_i2c_read_bit(struct bq2415x_device *bq, u8 reg, u8 bit)
  202. {
  203. if (bit > 8)
  204. return -EINVAL;
  205. return bq2415x_i2c_read_mask(bq, reg, BIT(bit), bit);
  206. }
  207. /**** i2c write functions ****/
  208. /* write value to register */
  209. static int bq2415x_i2c_write(struct bq2415x_device *bq, u8 reg, u8 val)
  210. {
  211. struct i2c_client *client = to_i2c_client(bq->dev);
  212. struct i2c_msg msg[1];
  213. u8 data[2];
  214. int ret;
  215. data[0] = reg;
  216. data[1] = val;
  217. msg[0].addr = client->addr;
  218. msg[0].flags = 0;
  219. msg[0].buf = data;
  220. msg[0].len = ARRAY_SIZE(data);
  221. mutex_lock(&bq2415x_i2c_mutex);
  222. ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
  223. mutex_unlock(&bq2415x_i2c_mutex);
  224. /* i2c_transfer returns number of messages transferred */
  225. if (ret < 0)
  226. return ret;
  227. else if (ret != 1)
  228. return -EIO;
  229. return 0;
  230. }
  231. /* read value from register, change it with mask left shifted and write back */
  232. static int bq2415x_i2c_write_mask(struct bq2415x_device *bq, u8 reg, u8 val,
  233. u8 mask, u8 shift)
  234. {
  235. int ret;
  236. if (shift > 8)
  237. return -EINVAL;
  238. ret = bq2415x_i2c_read(bq, reg);
  239. if (ret < 0)
  240. return ret;
  241. ret &= ~mask;
  242. ret |= val << shift;
  243. return bq2415x_i2c_write(bq, reg, ret);
  244. }
  245. /* change only one bit in register */
  246. static int bq2415x_i2c_write_bit(struct bq2415x_device *bq, u8 reg,
  247. bool val, u8 bit)
  248. {
  249. if (bit > 8)
  250. return -EINVAL;
  251. return bq2415x_i2c_write_mask(bq, reg, val, BIT(bit), bit);
  252. }
  253. /**** global functions ****/
  254. /* exec command function */
  255. static int bq2415x_exec_command(struct bq2415x_device *bq,
  256. enum bq2415x_command command)
  257. {
  258. int ret;
  259. switch (command) {
  260. case BQ2415X_TIMER_RESET:
  261. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS,
  262. 1, BQ2415X_BIT_TMR_RST);
  263. case BQ2415X_OTG_STATUS:
  264. return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
  265. BQ2415X_BIT_OTG);
  266. case BQ2415X_STAT_PIN_STATUS:
  267. return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
  268. BQ2415X_BIT_EN_STAT);
  269. case BQ2415X_STAT_PIN_ENABLE:
  270. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 1,
  271. BQ2415X_BIT_EN_STAT);
  272. case BQ2415X_STAT_PIN_DISABLE:
  273. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_STATUS, 0,
  274. BQ2415X_BIT_EN_STAT);
  275. case BQ2415X_CHARGE_STATUS:
  276. return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
  277. BQ2415X_MASK_STAT, BQ2415X_SHIFT_STAT);
  278. case BQ2415X_BOOST_STATUS:
  279. return bq2415x_i2c_read_bit(bq, BQ2415X_REG_STATUS,
  280. BQ2415X_BIT_BOOST);
  281. case BQ2415X_FAULT_STATUS:
  282. return bq2415x_i2c_read_mask(bq, BQ2415X_REG_STATUS,
  283. BQ2415X_MASK_FAULT, BQ2415X_SHIFT_FAULT);
  284. case BQ2415X_CHARGE_TERMINATION_STATUS:
  285. return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
  286. BQ2415X_BIT_TE);
  287. case BQ2415X_CHARGE_TERMINATION_ENABLE:
  288. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
  289. 1, BQ2415X_BIT_TE);
  290. case BQ2415X_CHARGE_TERMINATION_DISABLE:
  291. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
  292. 0, BQ2415X_BIT_TE);
  293. case BQ2415X_CHARGER_STATUS:
  294. ret = bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
  295. BQ2415X_BIT_CE);
  296. if (ret < 0)
  297. return ret;
  298. return ret > 0 ? 0 : 1;
  299. case BQ2415X_CHARGER_ENABLE:
  300. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
  301. 0, BQ2415X_BIT_CE);
  302. case BQ2415X_CHARGER_DISABLE:
  303. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
  304. 1, BQ2415X_BIT_CE);
  305. case BQ2415X_HIGH_IMPEDANCE_STATUS:
  306. return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
  307. BQ2415X_BIT_HZ_MODE);
  308. case BQ2415X_HIGH_IMPEDANCE_ENABLE:
  309. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
  310. 1, BQ2415X_BIT_HZ_MODE);
  311. case BQ2415X_HIGH_IMPEDANCE_DISABLE:
  312. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
  313. 0, BQ2415X_BIT_HZ_MODE);
  314. case BQ2415X_BOOST_MODE_STATUS:
  315. return bq2415x_i2c_read_bit(bq, BQ2415X_REG_CONTROL,
  316. BQ2415X_BIT_OPA_MODE);
  317. case BQ2415X_BOOST_MODE_ENABLE:
  318. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
  319. 1, BQ2415X_BIT_OPA_MODE);
  320. case BQ2415X_BOOST_MODE_DISABLE:
  321. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_CONTROL,
  322. 0, BQ2415X_BIT_OPA_MODE);
  323. case BQ2415X_OTG_LEVEL:
  324. return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
  325. BQ2415X_BIT_OTG_PL);
  326. case BQ2415X_OTG_ACTIVATE_HIGH:
  327. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
  328. 1, BQ2415X_BIT_OTG_PL);
  329. case BQ2415X_OTG_ACTIVATE_LOW:
  330. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
  331. 0, BQ2415X_BIT_OTG_PL);
  332. case BQ2415X_OTG_PIN_STATUS:
  333. return bq2415x_i2c_read_bit(bq, BQ2415X_REG_VOLTAGE,
  334. BQ2415X_BIT_OTG_EN);
  335. case BQ2415X_OTG_PIN_ENABLE:
  336. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
  337. 1, BQ2415X_BIT_OTG_EN);
  338. case BQ2415X_OTG_PIN_DISABLE:
  339. return bq2415x_i2c_write_bit(bq, BQ2415X_REG_VOLTAGE,
  340. 0, BQ2415X_BIT_OTG_EN);
  341. case BQ2415X_VENDER_CODE:
  342. return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
  343. BQ2415X_MASK_VENDER, BQ2415X_SHIFT_VENDER);
  344. case BQ2415X_PART_NUMBER:
  345. return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
  346. BQ2415X_MASK_PN, BQ2415X_SHIFT_PN);
  347. case BQ2415X_REVISION:
  348. return bq2415x_i2c_read_mask(bq, BQ2415X_REG_VENDER,
  349. BQ2415X_MASK_REVISION, BQ2415X_SHIFT_REVISION);
  350. }
  351. return -EINVAL;
  352. }
  353. /* detect chip type */
  354. static enum bq2415x_chip bq2415x_detect_chip(struct bq2415x_device *bq)
  355. {
  356. struct i2c_client *client = to_i2c_client(bq->dev);
  357. int ret = bq2415x_exec_command(bq, BQ2415X_PART_NUMBER);
  358. if (ret < 0)
  359. return ret;
  360. switch (client->addr) {
  361. case 0x6b:
  362. switch (ret) {
  363. case 0:
  364. if (bq->chip == BQ24151A)
  365. return bq->chip;
  366. return BQ24151;
  367. case 1:
  368. if (bq->chip == BQ24150A ||
  369. bq->chip == BQ24152 ||
  370. bq->chip == BQ24155)
  371. return bq->chip;
  372. return BQ24150;
  373. case 2:
  374. if (bq->chip == BQ24153A)
  375. return bq->chip;
  376. return BQ24153;
  377. default:
  378. return BQUNKNOWN;
  379. }
  380. break;
  381. case 0x6a:
  382. switch (ret) {
  383. case 0:
  384. if (bq->chip == BQ24156A)
  385. return bq->chip;
  386. return BQ24156;
  387. case 2:
  388. if (bq->chip == BQ24157S)
  389. return bq->chip;
  390. return BQ24158;
  391. default:
  392. return BQUNKNOWN;
  393. }
  394. break;
  395. }
  396. return BQUNKNOWN;
  397. }
  398. /* detect chip revision */
  399. static int bq2415x_detect_revision(struct bq2415x_device *bq)
  400. {
  401. int ret = bq2415x_exec_command(bq, BQ2415X_REVISION);
  402. int chip = bq2415x_detect_chip(bq);
  403. if (ret < 0 || chip < 0)
  404. return -1;
  405. switch (chip) {
  406. case BQ24150:
  407. case BQ24150A:
  408. case BQ24151:
  409. case BQ24151A:
  410. case BQ24152:
  411. if (ret >= 0 && ret <= 3)
  412. return ret;
  413. return -1;
  414. case BQ24153:
  415. case BQ24153A:
  416. case BQ24156:
  417. case BQ24156A:
  418. case BQ24157S:
  419. case BQ24158:
  420. if (ret == 3)
  421. return 0;
  422. else if (ret == 1)
  423. return 1;
  424. return -1;
  425. case BQ24155:
  426. if (ret == 3)
  427. return 3;
  428. return -1;
  429. case BQUNKNOWN:
  430. return -1;
  431. }
  432. return -1;
  433. }
  434. /* return chip vender code */
  435. static int bq2415x_get_vender_code(struct bq2415x_device *bq)
  436. {
  437. int ret;
  438. ret = bq2415x_exec_command(bq, BQ2415X_VENDER_CODE);
  439. if (ret < 0)
  440. return 0;
  441. /* convert to binary */
  442. return (ret & 0x1) +
  443. ((ret >> 1) & 0x1) * 10 +
  444. ((ret >> 2) & 0x1) * 100;
  445. }
  446. /* reset all chip registers to default state */
  447. static void bq2415x_reset_chip(struct bq2415x_device *bq)
  448. {
  449. bq2415x_i2c_write(bq, BQ2415X_REG_CURRENT, BQ2415X_RESET_CURRENT);
  450. bq2415x_i2c_write(bq, BQ2415X_REG_VOLTAGE, BQ2415X_RESET_VOLTAGE);
  451. bq2415x_i2c_write(bq, BQ2415X_REG_CONTROL, BQ2415X_RESET_CONTROL);
  452. bq2415x_i2c_write(bq, BQ2415X_REG_STATUS, BQ2415X_RESET_STATUS);
  453. bq->timer_error = NULL;
  454. }
  455. /**** properties functions ****/
  456. /* set current limit in mA */
  457. static int bq2415x_set_current_limit(struct bq2415x_device *bq, int mA)
  458. {
  459. int val;
  460. if (mA <= 100)
  461. val = 0;
  462. else if (mA <= 500)
  463. val = 1;
  464. else if (mA <= 800)
  465. val = 2;
  466. else
  467. val = 3;
  468. return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
  469. BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
  470. }
  471. /* get current limit in mA */
  472. static int bq2415x_get_current_limit(struct bq2415x_device *bq)
  473. {
  474. int ret;
  475. ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
  476. BQ2415X_MASK_LIMIT, BQ2415X_SHIFT_LIMIT);
  477. if (ret < 0)
  478. return ret;
  479. else if (ret == 0)
  480. return 100;
  481. else if (ret == 1)
  482. return 500;
  483. else if (ret == 2)
  484. return 800;
  485. else if (ret == 3)
  486. return 1800;
  487. return -EINVAL;
  488. }
  489. /* set weak battery voltage in mV */
  490. static int bq2415x_set_weak_battery_voltage(struct bq2415x_device *bq, int mV)
  491. {
  492. int val;
  493. /* round to 100mV */
  494. if (mV <= 3400 + 50)
  495. val = 0;
  496. else if (mV <= 3500 + 50)
  497. val = 1;
  498. else if (mV <= 3600 + 50)
  499. val = 2;
  500. else
  501. val = 3;
  502. return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CONTROL, val,
  503. BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
  504. }
  505. /* get weak battery voltage in mV */
  506. static int bq2415x_get_weak_battery_voltage(struct bq2415x_device *bq)
  507. {
  508. int ret;
  509. ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CONTROL,
  510. BQ2415X_MASK_VLOWV, BQ2415X_SHIFT_VLOWV);
  511. if (ret < 0)
  512. return ret;
  513. return 100 * (34 + ret);
  514. }
  515. /* set battery regulation voltage in mV */
  516. static int bq2415x_set_battery_regulation_voltage(struct bq2415x_device *bq,
  517. int mV)
  518. {
  519. int val = (mV/10 - 350) / 2;
  520. /*
  521. * According to datasheet, maximum battery regulation voltage is
  522. * 4440mV which is b101111 = 47.
  523. */
  524. if (val < 0)
  525. val = 0;
  526. else if (val > 47)
  527. return -EINVAL;
  528. return bq2415x_i2c_write_mask(bq, BQ2415X_REG_VOLTAGE, val,
  529. BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
  530. }
  531. /* get battery regulation voltage in mV */
  532. static int bq2415x_get_battery_regulation_voltage(struct bq2415x_device *bq)
  533. {
  534. int ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_VOLTAGE,
  535. BQ2415X_MASK_VO, BQ2415X_SHIFT_VO);
  536. if (ret < 0)
  537. return ret;
  538. return 10 * (350 + 2*ret);
  539. }
  540. /* set charge current in mA (platform data must provide resistor sense) */
  541. static int bq2415x_set_charge_current(struct bq2415x_device *bq, int mA)
  542. {
  543. int val;
  544. if (bq->init_data.resistor_sense <= 0)
  545. return -EINVAL;
  546. val = (mA * bq->init_data.resistor_sense - 37400) / 6800;
  547. if (val < 0)
  548. val = 0;
  549. else if (val > 7)
  550. val = 7;
  551. return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
  552. BQ2415X_MASK_VI_CHRG | BQ2415X_MASK_RESET,
  553. BQ2415X_SHIFT_VI_CHRG);
  554. }
  555. /* get charge current in mA (platform data must provide resistor sense) */
  556. static int bq2415x_get_charge_current(struct bq2415x_device *bq)
  557. {
  558. int ret;
  559. if (bq->init_data.resistor_sense <= 0)
  560. return -EINVAL;
  561. ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
  562. BQ2415X_MASK_VI_CHRG, BQ2415X_SHIFT_VI_CHRG);
  563. if (ret < 0)
  564. return ret;
  565. return (37400 + 6800*ret) / bq->init_data.resistor_sense;
  566. }
  567. /* set termination current in mA (platform data must provide resistor sense) */
  568. static int bq2415x_set_termination_current(struct bq2415x_device *bq, int mA)
  569. {
  570. int val;
  571. if (bq->init_data.resistor_sense <= 0)
  572. return -EINVAL;
  573. val = (mA * bq->init_data.resistor_sense - 3400) / 3400;
  574. if (val < 0)
  575. val = 0;
  576. else if (val > 7)
  577. val = 7;
  578. return bq2415x_i2c_write_mask(bq, BQ2415X_REG_CURRENT, val,
  579. BQ2415X_MASK_VI_TERM | BQ2415X_MASK_RESET,
  580. BQ2415X_SHIFT_VI_TERM);
  581. }
  582. /* get termination current in mA (platform data must provide resistor sense) */
  583. static int bq2415x_get_termination_current(struct bq2415x_device *bq)
  584. {
  585. int ret;
  586. if (bq->init_data.resistor_sense <= 0)
  587. return -EINVAL;
  588. ret = bq2415x_i2c_read_mask(bq, BQ2415X_REG_CURRENT,
  589. BQ2415X_MASK_VI_TERM, BQ2415X_SHIFT_VI_TERM);
  590. if (ret < 0)
  591. return ret;
  592. return (3400 + 3400*ret) / bq->init_data.resistor_sense;
  593. }
  594. /* set default value of property */
  595. #define bq2415x_set_default_value(bq, prop) \
  596. do { \
  597. int ret = 0; \
  598. if (bq->init_data.prop != -1) \
  599. ret = bq2415x_set_##prop(bq, bq->init_data.prop); \
  600. if (ret < 0) \
  601. return ret; \
  602. } while (0)
  603. /* set default values of all properties */
  604. static int bq2415x_set_defaults(struct bq2415x_device *bq)
  605. {
  606. bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
  607. bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
  608. bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_DISABLE);
  609. bq2415x_set_default_value(bq, current_limit);
  610. bq2415x_set_default_value(bq, weak_battery_voltage);
  611. bq2415x_set_default_value(bq, battery_regulation_voltage);
  612. if (bq->init_data.resistor_sense > 0) {
  613. bq2415x_set_default_value(bq, charge_current);
  614. bq2415x_set_default_value(bq, termination_current);
  615. bq2415x_exec_command(bq, BQ2415X_CHARGE_TERMINATION_ENABLE);
  616. }
  617. bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
  618. return 0;
  619. }
  620. /**** charger mode functions ****/
  621. /* set charger mode */
  622. static int bq2415x_set_mode(struct bq2415x_device *bq, enum bq2415x_mode mode)
  623. {
  624. int ret = 0;
  625. int charger = 0;
  626. int boost = 0;
  627. if (mode == BQ2415X_MODE_BOOST)
  628. boost = 1;
  629. else if (mode != BQ2415X_MODE_OFF)
  630. charger = 1;
  631. if (!charger)
  632. ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_DISABLE);
  633. if (!boost)
  634. ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_DISABLE);
  635. if (ret < 0)
  636. return ret;
  637. switch (mode) {
  638. case BQ2415X_MODE_OFF:
  639. dev_dbg(bq->dev, "changing mode to: Offline\n");
  640. ret = bq2415x_set_current_limit(bq, 100);
  641. break;
  642. case BQ2415X_MODE_NONE:
  643. dev_dbg(bq->dev, "changing mode to: N/A\n");
  644. ret = bq2415x_set_current_limit(bq, 100);
  645. break;
  646. case BQ2415X_MODE_HOST_CHARGER:
  647. dev_dbg(bq->dev, "changing mode to: Host/HUB charger\n");
  648. ret = bq2415x_set_current_limit(bq, 500);
  649. break;
  650. case BQ2415X_MODE_DEDICATED_CHARGER:
  651. dev_dbg(bq->dev, "changing mode to: Dedicated charger\n");
  652. ret = bq2415x_set_current_limit(bq, 1800);
  653. break;
  654. case BQ2415X_MODE_BOOST: /* Boost mode */
  655. dev_dbg(bq->dev, "changing mode to: Boost\n");
  656. ret = bq2415x_set_current_limit(bq, 100);
  657. break;
  658. }
  659. if (ret < 0)
  660. return ret;
  661. if (charger)
  662. ret = bq2415x_exec_command(bq, BQ2415X_CHARGER_ENABLE);
  663. else if (boost)
  664. ret = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_ENABLE);
  665. if (ret < 0)
  666. return ret;
  667. bq2415x_set_default_value(bq, weak_battery_voltage);
  668. bq2415x_set_default_value(bq, battery_regulation_voltage);
  669. bq->mode = mode;
  670. sysfs_notify(&bq->charger->dev.kobj, NULL, "mode");
  671. return 0;
  672. }
  673. static bool bq2415x_update_reported_mode(struct bq2415x_device *bq, int mA)
  674. {
  675. enum bq2415x_mode mode;
  676. if (mA == 0)
  677. mode = BQ2415X_MODE_OFF;
  678. else if (mA < 500)
  679. mode = BQ2415X_MODE_NONE;
  680. else if (mA < 1800)
  681. mode = BQ2415X_MODE_HOST_CHARGER;
  682. else
  683. mode = BQ2415X_MODE_DEDICATED_CHARGER;
  684. if (bq->reported_mode == mode)
  685. return false;
  686. bq->reported_mode = mode;
  687. return true;
  688. }
  689. static int bq2415x_notifier_call(struct notifier_block *nb,
  690. unsigned long val, void *v)
  691. {
  692. struct bq2415x_device *bq =
  693. container_of(nb, struct bq2415x_device, nb);
  694. struct power_supply *psy = v;
  695. union power_supply_propval prop;
  696. int ret;
  697. if (val != PSY_EVENT_PROP_CHANGED)
  698. return NOTIFY_OK;
  699. /* Ignore event if it was not send by notify_node/notify_device */
  700. if (bq->notify_node) {
  701. if (!psy->dev.parent ||
  702. psy->dev.parent->of_node != bq->notify_node)
  703. return NOTIFY_OK;
  704. } else if (bq->init_data.notify_device) {
  705. if (strcmp(psy->desc->name, bq->init_data.notify_device) != 0)
  706. return NOTIFY_OK;
  707. }
  708. dev_dbg(bq->dev, "notifier call was called\n");
  709. ret = power_supply_get_property(psy, POWER_SUPPLY_PROP_CURRENT_MAX,
  710. &prop);
  711. if (ret != 0)
  712. return NOTIFY_OK;
  713. if (!bq2415x_update_reported_mode(bq, prop.intval))
  714. return NOTIFY_OK;
  715. /* if automode is not enabled do not tell about reported_mode */
  716. if (bq->automode < 1)
  717. return NOTIFY_OK;
  718. schedule_delayed_work(&bq->work, 0);
  719. return NOTIFY_OK;
  720. }
  721. /**** timer functions ****/
  722. /* enable/disable auto resetting chip timer */
  723. static void bq2415x_set_autotimer(struct bq2415x_device *bq, int state)
  724. {
  725. mutex_lock(&bq2415x_timer_mutex);
  726. if (bq->autotimer == state) {
  727. mutex_unlock(&bq2415x_timer_mutex);
  728. return;
  729. }
  730. bq->autotimer = state;
  731. if (state) {
  732. schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
  733. bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
  734. bq->timer_error = NULL;
  735. } else {
  736. cancel_delayed_work_sync(&bq->work);
  737. }
  738. mutex_unlock(&bq2415x_timer_mutex);
  739. }
  740. /* called by bq2415x_timer_work on timer error */
  741. static void bq2415x_timer_error(struct bq2415x_device *bq, const char *msg)
  742. {
  743. bq->timer_error = msg;
  744. sysfs_notify(&bq->charger->dev.kobj, NULL, "timer");
  745. dev_err(bq->dev, "%s\n", msg);
  746. if (bq->automode > 0)
  747. bq->automode = 0;
  748. bq2415x_set_mode(bq, BQ2415X_MODE_OFF);
  749. bq2415x_set_autotimer(bq, 0);
  750. }
  751. /* delayed work function for auto resetting chip timer */
  752. static void bq2415x_timer_work(struct work_struct *work)
  753. {
  754. struct bq2415x_device *bq = container_of(work, struct bq2415x_device,
  755. work.work);
  756. int ret;
  757. int error;
  758. int boost;
  759. if (bq->automode > 0 && (bq->reported_mode != bq->mode)) {
  760. sysfs_notify(&bq->charger->dev.kobj, NULL, "reported_mode");
  761. bq2415x_set_mode(bq, bq->reported_mode);
  762. }
  763. if (!bq->autotimer)
  764. return;
  765. ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
  766. if (ret < 0) {
  767. bq2415x_timer_error(bq, "Resetting timer failed");
  768. return;
  769. }
  770. boost = bq2415x_exec_command(bq, BQ2415X_BOOST_MODE_STATUS);
  771. if (boost < 0) {
  772. bq2415x_timer_error(bq, "Unknown error");
  773. return;
  774. }
  775. error = bq2415x_exec_command(bq, BQ2415X_FAULT_STATUS);
  776. if (error < 0) {
  777. bq2415x_timer_error(bq, "Unknown error");
  778. return;
  779. }
  780. if (boost) {
  781. switch (error) {
  782. /* Non fatal errors, chip is OK */
  783. case 0: /* No error */
  784. break;
  785. case 6: /* Timer expired */
  786. dev_err(bq->dev, "Timer expired\n");
  787. break;
  788. case 3: /* Battery voltage too low */
  789. dev_err(bq->dev, "Battery voltage to low\n");
  790. break;
  791. /* Fatal errors, disable and reset chip */
  792. case 1: /* Overvoltage protection (chip fried) */
  793. bq2415x_timer_error(bq,
  794. "Overvoltage protection (chip fried)");
  795. return;
  796. case 2: /* Overload */
  797. bq2415x_timer_error(bq, "Overload");
  798. return;
  799. case 4: /* Battery overvoltage protection */
  800. bq2415x_timer_error(bq,
  801. "Battery overvoltage protection");
  802. return;
  803. case 5: /* Thermal shutdown (too hot) */
  804. bq2415x_timer_error(bq,
  805. "Thermal shutdown (too hot)");
  806. return;
  807. case 7: /* N/A */
  808. bq2415x_timer_error(bq, "Unknown error");
  809. return;
  810. }
  811. } else {
  812. switch (error) {
  813. /* Non fatal errors, chip is OK */
  814. case 0: /* No error */
  815. break;
  816. case 2: /* Sleep mode */
  817. dev_err(bq->dev, "Sleep mode\n");
  818. break;
  819. case 3: /* Poor input source */
  820. dev_err(bq->dev, "Poor input source\n");
  821. break;
  822. case 6: /* Timer expired */
  823. dev_err(bq->dev, "Timer expired\n");
  824. break;
  825. case 7: /* No battery */
  826. dev_err(bq->dev, "No battery\n");
  827. break;
  828. /* Fatal errors, disable and reset chip */
  829. case 1: /* Overvoltage protection (chip fried) */
  830. bq2415x_timer_error(bq,
  831. "Overvoltage protection (chip fried)");
  832. return;
  833. case 4: /* Battery overvoltage protection */
  834. bq2415x_timer_error(bq,
  835. "Battery overvoltage protection");
  836. return;
  837. case 5: /* Thermal shutdown (too hot) */
  838. bq2415x_timer_error(bq,
  839. "Thermal shutdown (too hot)");
  840. return;
  841. }
  842. }
  843. schedule_delayed_work(&bq->work, BQ2415X_TIMER_TIMEOUT * HZ);
  844. }
  845. /**** power supply interface code ****/
  846. static enum power_supply_property bq2415x_power_supply_props[] = {
  847. /* TODO: maybe add more power supply properties */
  848. POWER_SUPPLY_PROP_STATUS,
  849. POWER_SUPPLY_PROP_MODEL_NAME,
  850. };
  851. static int bq2415x_power_supply_get_property(struct power_supply *psy,
  852. enum power_supply_property psp,
  853. union power_supply_propval *val)
  854. {
  855. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  856. int ret;
  857. switch (psp) {
  858. case POWER_SUPPLY_PROP_STATUS:
  859. ret = bq2415x_exec_command(bq, BQ2415X_CHARGE_STATUS);
  860. if (ret < 0)
  861. return ret;
  862. else if (ret == 0) /* Ready */
  863. val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
  864. else if (ret == 1) /* Charge in progress */
  865. val->intval = POWER_SUPPLY_STATUS_CHARGING;
  866. else if (ret == 2) /* Charge done */
  867. val->intval = POWER_SUPPLY_STATUS_FULL;
  868. else
  869. val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
  870. break;
  871. case POWER_SUPPLY_PROP_MODEL_NAME:
  872. val->strval = bq->model;
  873. break;
  874. default:
  875. return -EINVAL;
  876. }
  877. return 0;
  878. }
  879. static void bq2415x_power_supply_exit(struct bq2415x_device *bq)
  880. {
  881. bq->autotimer = 0;
  882. if (bq->automode > 0)
  883. bq->automode = 0;
  884. cancel_delayed_work_sync(&bq->work);
  885. power_supply_unregister(bq->charger);
  886. kfree(bq->model);
  887. }
  888. /**** additional sysfs entries for power supply interface ****/
  889. /* show *_status entries */
  890. static ssize_t bq2415x_sysfs_show_status(struct device *dev,
  891. struct device_attribute *attr,
  892. char *buf)
  893. {
  894. struct power_supply *psy = dev_get_drvdata(dev);
  895. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  896. enum bq2415x_command command;
  897. int ret;
  898. if (strcmp(attr->attr.name, "otg_status") == 0)
  899. command = BQ2415X_OTG_STATUS;
  900. else if (strcmp(attr->attr.name, "charge_status") == 0)
  901. command = BQ2415X_CHARGE_STATUS;
  902. else if (strcmp(attr->attr.name, "boost_status") == 0)
  903. command = BQ2415X_BOOST_STATUS;
  904. else if (strcmp(attr->attr.name, "fault_status") == 0)
  905. command = BQ2415X_FAULT_STATUS;
  906. else
  907. return -EINVAL;
  908. ret = bq2415x_exec_command(bq, command);
  909. if (ret < 0)
  910. return ret;
  911. return sprintf(buf, "%d\n", ret);
  912. }
  913. /*
  914. * set timer entry:
  915. * auto - enable auto mode
  916. * off - disable auto mode
  917. * (other values) - reset chip timer
  918. */
  919. static ssize_t bq2415x_sysfs_set_timer(struct device *dev,
  920. struct device_attribute *attr,
  921. const char *buf,
  922. size_t count)
  923. {
  924. struct power_supply *psy = dev_get_drvdata(dev);
  925. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  926. int ret = 0;
  927. if (strncmp(buf, "auto", 4) == 0)
  928. bq2415x_set_autotimer(bq, 1);
  929. else if (strncmp(buf, "off", 3) == 0)
  930. bq2415x_set_autotimer(bq, 0);
  931. else
  932. ret = bq2415x_exec_command(bq, BQ2415X_TIMER_RESET);
  933. if (ret < 0)
  934. return ret;
  935. return count;
  936. }
  937. /* show timer entry (auto or off) */
  938. static ssize_t bq2415x_sysfs_show_timer(struct device *dev,
  939. struct device_attribute *attr,
  940. char *buf)
  941. {
  942. struct power_supply *psy = dev_get_drvdata(dev);
  943. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  944. if (bq->timer_error)
  945. return sprintf(buf, "%s\n", bq->timer_error);
  946. if (bq->autotimer)
  947. return sprintf(buf, "auto\n");
  948. return sprintf(buf, "off\n");
  949. }
  950. /*
  951. * set mode entry:
  952. * auto - if automode is supported, enable it and set mode to reported
  953. * none - disable charger and boost mode
  954. * host - charging mode for host/hub chargers (current limit 500mA)
  955. * dedicated - charging mode for dedicated chargers (unlimited current limit)
  956. * boost - disable charger and enable boost mode
  957. */
  958. static ssize_t bq2415x_sysfs_set_mode(struct device *dev,
  959. struct device_attribute *attr,
  960. const char *buf,
  961. size_t count)
  962. {
  963. struct power_supply *psy = dev_get_drvdata(dev);
  964. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  965. enum bq2415x_mode mode;
  966. int ret = 0;
  967. if (strncmp(buf, "auto", 4) == 0) {
  968. if (bq->automode < 0)
  969. return -EINVAL;
  970. bq->automode = 1;
  971. mode = bq->reported_mode;
  972. } else if (strncmp(buf, "off", 3) == 0) {
  973. if (bq->automode > 0)
  974. bq->automode = 0;
  975. mode = BQ2415X_MODE_OFF;
  976. } else if (strncmp(buf, "none", 4) == 0) {
  977. if (bq->automode > 0)
  978. bq->automode = 0;
  979. mode = BQ2415X_MODE_NONE;
  980. } else if (strncmp(buf, "host", 4) == 0) {
  981. if (bq->automode > 0)
  982. bq->automode = 0;
  983. mode = BQ2415X_MODE_HOST_CHARGER;
  984. } else if (strncmp(buf, "dedicated", 9) == 0) {
  985. if (bq->automode > 0)
  986. bq->automode = 0;
  987. mode = BQ2415X_MODE_DEDICATED_CHARGER;
  988. } else if (strncmp(buf, "boost", 5) == 0) {
  989. if (bq->automode > 0)
  990. bq->automode = 0;
  991. mode = BQ2415X_MODE_BOOST;
  992. } else if (strncmp(buf, "reset", 5) == 0) {
  993. bq2415x_reset_chip(bq);
  994. bq2415x_set_defaults(bq);
  995. if (bq->automode <= 0)
  996. return count;
  997. bq->automode = 1;
  998. mode = bq->reported_mode;
  999. } else {
  1000. return -EINVAL;
  1001. }
  1002. ret = bq2415x_set_mode(bq, mode);
  1003. if (ret < 0)
  1004. return ret;
  1005. return count;
  1006. }
  1007. /* show mode entry (auto, none, host, dedicated or boost) */
  1008. static ssize_t bq2415x_sysfs_show_mode(struct device *dev,
  1009. struct device_attribute *attr,
  1010. char *buf)
  1011. {
  1012. struct power_supply *psy = dev_get_drvdata(dev);
  1013. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  1014. ssize_t ret = 0;
  1015. if (bq->automode > 0)
  1016. ret += sprintf(buf+ret, "auto (");
  1017. switch (bq->mode) {
  1018. case BQ2415X_MODE_OFF:
  1019. ret += sprintf(buf+ret, "off");
  1020. break;
  1021. case BQ2415X_MODE_NONE:
  1022. ret += sprintf(buf+ret, "none");
  1023. break;
  1024. case BQ2415X_MODE_HOST_CHARGER:
  1025. ret += sprintf(buf+ret, "host");
  1026. break;
  1027. case BQ2415X_MODE_DEDICATED_CHARGER:
  1028. ret += sprintf(buf+ret, "dedicated");
  1029. break;
  1030. case BQ2415X_MODE_BOOST:
  1031. ret += sprintf(buf+ret, "boost");
  1032. break;
  1033. }
  1034. if (bq->automode > 0)
  1035. ret += sprintf(buf+ret, ")");
  1036. ret += sprintf(buf+ret, "\n");
  1037. return ret;
  1038. }
  1039. /* show reported_mode entry (none, host, dedicated or boost) */
  1040. static ssize_t bq2415x_sysfs_show_reported_mode(struct device *dev,
  1041. struct device_attribute *attr,
  1042. char *buf)
  1043. {
  1044. struct power_supply *psy = dev_get_drvdata(dev);
  1045. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  1046. if (bq->automode < 0)
  1047. return -EINVAL;
  1048. switch (bq->reported_mode) {
  1049. case BQ2415X_MODE_OFF:
  1050. return sprintf(buf, "off\n");
  1051. case BQ2415X_MODE_NONE:
  1052. return sprintf(buf, "none\n");
  1053. case BQ2415X_MODE_HOST_CHARGER:
  1054. return sprintf(buf, "host\n");
  1055. case BQ2415X_MODE_DEDICATED_CHARGER:
  1056. return sprintf(buf, "dedicated\n");
  1057. case BQ2415X_MODE_BOOST:
  1058. return sprintf(buf, "boost\n");
  1059. }
  1060. return -EINVAL;
  1061. }
  1062. /* directly set raw value to chip register, format: 'register value' */
  1063. static ssize_t bq2415x_sysfs_set_registers(struct device *dev,
  1064. struct device_attribute *attr,
  1065. const char *buf,
  1066. size_t count)
  1067. {
  1068. struct power_supply *psy = dev_get_drvdata(dev);
  1069. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  1070. ssize_t ret = 0;
  1071. unsigned int reg;
  1072. unsigned int val;
  1073. if (sscanf(buf, "%x %x", &reg, &val) != 2)
  1074. return -EINVAL;
  1075. if (reg > 4 || val > 255)
  1076. return -EINVAL;
  1077. ret = bq2415x_i2c_write(bq, reg, val);
  1078. if (ret < 0)
  1079. return ret;
  1080. return count;
  1081. }
  1082. /* print value of chip register, format: 'register=value' */
  1083. static ssize_t bq2415x_sysfs_print_reg(struct bq2415x_device *bq,
  1084. u8 reg,
  1085. char *buf)
  1086. {
  1087. int ret = bq2415x_i2c_read(bq, reg);
  1088. if (ret < 0)
  1089. return sprintf(buf, "%#.2x=error %d\n", reg, ret);
  1090. return sprintf(buf, "%#.2x=%#.2x\n", reg, ret);
  1091. }
  1092. /* show all raw values of chip register, format per line: 'register=value' */
  1093. static ssize_t bq2415x_sysfs_show_registers(struct device *dev,
  1094. struct device_attribute *attr,
  1095. char *buf)
  1096. {
  1097. struct power_supply *psy = dev_get_drvdata(dev);
  1098. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  1099. ssize_t ret = 0;
  1100. ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_STATUS, buf+ret);
  1101. ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CONTROL, buf+ret);
  1102. ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VOLTAGE, buf+ret);
  1103. ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_VENDER, buf+ret);
  1104. ret += bq2415x_sysfs_print_reg(bq, BQ2415X_REG_CURRENT, buf+ret);
  1105. return ret;
  1106. }
  1107. /* set current and voltage limit entries (in mA or mV) */
  1108. static ssize_t bq2415x_sysfs_set_limit(struct device *dev,
  1109. struct device_attribute *attr,
  1110. const char *buf,
  1111. size_t count)
  1112. {
  1113. struct power_supply *psy = dev_get_drvdata(dev);
  1114. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  1115. long val;
  1116. int ret;
  1117. if (kstrtol(buf, 10, &val) < 0)
  1118. return -EINVAL;
  1119. if (strcmp(attr->attr.name, "current_limit") == 0)
  1120. ret = bq2415x_set_current_limit(bq, val);
  1121. else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
  1122. ret = bq2415x_set_weak_battery_voltage(bq, val);
  1123. else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
  1124. ret = bq2415x_set_battery_regulation_voltage(bq, val);
  1125. else if (strcmp(attr->attr.name, "charge_current") == 0)
  1126. ret = bq2415x_set_charge_current(bq, val);
  1127. else if (strcmp(attr->attr.name, "termination_current") == 0)
  1128. ret = bq2415x_set_termination_current(bq, val);
  1129. else
  1130. return -EINVAL;
  1131. if (ret < 0)
  1132. return ret;
  1133. return count;
  1134. }
  1135. /* show current and voltage limit entries (in mA or mV) */
  1136. static ssize_t bq2415x_sysfs_show_limit(struct device *dev,
  1137. struct device_attribute *attr,
  1138. char *buf)
  1139. {
  1140. struct power_supply *psy = dev_get_drvdata(dev);
  1141. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  1142. int ret;
  1143. if (strcmp(attr->attr.name, "current_limit") == 0)
  1144. ret = bq2415x_get_current_limit(bq);
  1145. else if (strcmp(attr->attr.name, "weak_battery_voltage") == 0)
  1146. ret = bq2415x_get_weak_battery_voltage(bq);
  1147. else if (strcmp(attr->attr.name, "battery_regulation_voltage") == 0)
  1148. ret = bq2415x_get_battery_regulation_voltage(bq);
  1149. else if (strcmp(attr->attr.name, "charge_current") == 0)
  1150. ret = bq2415x_get_charge_current(bq);
  1151. else if (strcmp(attr->attr.name, "termination_current") == 0)
  1152. ret = bq2415x_get_termination_current(bq);
  1153. else
  1154. return -EINVAL;
  1155. if (ret < 0)
  1156. return ret;
  1157. return sprintf(buf, "%d\n", ret);
  1158. }
  1159. /* set *_enable entries */
  1160. static ssize_t bq2415x_sysfs_set_enable(struct device *dev,
  1161. struct device_attribute *attr,
  1162. const char *buf,
  1163. size_t count)
  1164. {
  1165. struct power_supply *psy = dev_get_drvdata(dev);
  1166. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  1167. enum bq2415x_command command;
  1168. long val;
  1169. int ret;
  1170. if (kstrtol(buf, 10, &val) < 0)
  1171. return -EINVAL;
  1172. if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
  1173. command = val ? BQ2415X_CHARGE_TERMINATION_ENABLE :
  1174. BQ2415X_CHARGE_TERMINATION_DISABLE;
  1175. else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
  1176. command = val ? BQ2415X_HIGH_IMPEDANCE_ENABLE :
  1177. BQ2415X_HIGH_IMPEDANCE_DISABLE;
  1178. else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
  1179. command = val ? BQ2415X_OTG_PIN_ENABLE :
  1180. BQ2415X_OTG_PIN_DISABLE;
  1181. else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
  1182. command = val ? BQ2415X_STAT_PIN_ENABLE :
  1183. BQ2415X_STAT_PIN_DISABLE;
  1184. else
  1185. return -EINVAL;
  1186. ret = bq2415x_exec_command(bq, command);
  1187. if (ret < 0)
  1188. return ret;
  1189. return count;
  1190. }
  1191. /* show *_enable entries */
  1192. static ssize_t bq2415x_sysfs_show_enable(struct device *dev,
  1193. struct device_attribute *attr,
  1194. char *buf)
  1195. {
  1196. struct power_supply *psy = dev_get_drvdata(dev);
  1197. struct bq2415x_device *bq = power_supply_get_drvdata(psy);
  1198. enum bq2415x_command command;
  1199. int ret;
  1200. if (strcmp(attr->attr.name, "charge_termination_enable") == 0)
  1201. command = BQ2415X_CHARGE_TERMINATION_STATUS;
  1202. else if (strcmp(attr->attr.name, "high_impedance_enable") == 0)
  1203. command = BQ2415X_HIGH_IMPEDANCE_STATUS;
  1204. else if (strcmp(attr->attr.name, "otg_pin_enable") == 0)
  1205. command = BQ2415X_OTG_PIN_STATUS;
  1206. else if (strcmp(attr->attr.name, "stat_pin_enable") == 0)
  1207. command = BQ2415X_STAT_PIN_STATUS;
  1208. else
  1209. return -EINVAL;
  1210. ret = bq2415x_exec_command(bq, command);
  1211. if (ret < 0)
  1212. return ret;
  1213. return sprintf(buf, "%d\n", ret);
  1214. }
  1215. static DEVICE_ATTR(current_limit, S_IWUSR | S_IRUGO,
  1216. bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
  1217. static DEVICE_ATTR(weak_battery_voltage, S_IWUSR | S_IRUGO,
  1218. bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
  1219. static DEVICE_ATTR(battery_regulation_voltage, S_IWUSR | S_IRUGO,
  1220. bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
  1221. static DEVICE_ATTR(charge_current, S_IWUSR | S_IRUGO,
  1222. bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
  1223. static DEVICE_ATTR(termination_current, S_IWUSR | S_IRUGO,
  1224. bq2415x_sysfs_show_limit, bq2415x_sysfs_set_limit);
  1225. static DEVICE_ATTR(charge_termination_enable, S_IWUSR | S_IRUGO,
  1226. bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
  1227. static DEVICE_ATTR(high_impedance_enable, S_IWUSR | S_IRUGO,
  1228. bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
  1229. static DEVICE_ATTR(otg_pin_enable, S_IWUSR | S_IRUGO,
  1230. bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
  1231. static DEVICE_ATTR(stat_pin_enable, S_IWUSR | S_IRUGO,
  1232. bq2415x_sysfs_show_enable, bq2415x_sysfs_set_enable);
  1233. static DEVICE_ATTR(reported_mode, S_IRUGO,
  1234. bq2415x_sysfs_show_reported_mode, NULL);
  1235. static DEVICE_ATTR(mode, S_IWUSR | S_IRUGO,
  1236. bq2415x_sysfs_show_mode, bq2415x_sysfs_set_mode);
  1237. static DEVICE_ATTR(timer, S_IWUSR | S_IRUGO,
  1238. bq2415x_sysfs_show_timer, bq2415x_sysfs_set_timer);
  1239. static DEVICE_ATTR(registers, S_IWUSR | S_IRUGO,
  1240. bq2415x_sysfs_show_registers, bq2415x_sysfs_set_registers);
  1241. static DEVICE_ATTR(otg_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
  1242. static DEVICE_ATTR(charge_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
  1243. static DEVICE_ATTR(boost_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
  1244. static DEVICE_ATTR(fault_status, S_IRUGO, bq2415x_sysfs_show_status, NULL);
  1245. static struct attribute *bq2415x_sysfs_attrs[] = {
  1246. /*
  1247. * TODO: some (appropriate) of these attrs should be switched to
  1248. * use power supply class props.
  1249. */
  1250. &dev_attr_current_limit.attr,
  1251. &dev_attr_weak_battery_voltage.attr,
  1252. &dev_attr_battery_regulation_voltage.attr,
  1253. &dev_attr_charge_current.attr,
  1254. &dev_attr_termination_current.attr,
  1255. &dev_attr_charge_termination_enable.attr,
  1256. &dev_attr_high_impedance_enable.attr,
  1257. &dev_attr_otg_pin_enable.attr,
  1258. &dev_attr_stat_pin_enable.attr,
  1259. &dev_attr_reported_mode.attr,
  1260. &dev_attr_mode.attr,
  1261. &dev_attr_timer.attr,
  1262. &dev_attr_registers.attr,
  1263. &dev_attr_otg_status.attr,
  1264. &dev_attr_charge_status.attr,
  1265. &dev_attr_boost_status.attr,
  1266. &dev_attr_fault_status.attr,
  1267. NULL,
  1268. };
  1269. ATTRIBUTE_GROUPS(bq2415x_sysfs);
  1270. static int bq2415x_power_supply_init(struct bq2415x_device *bq)
  1271. {
  1272. int ret;
  1273. int chip;
  1274. char revstr[8];
  1275. struct power_supply_config psy_cfg = {
  1276. .drv_data = bq,
  1277. .of_node = bq->dev->of_node,
  1278. .attr_grp = bq2415x_sysfs_groups,
  1279. };
  1280. bq->charger_desc.name = bq->name;
  1281. bq->charger_desc.type = POWER_SUPPLY_TYPE_USB;
  1282. bq->charger_desc.properties = bq2415x_power_supply_props;
  1283. bq->charger_desc.num_properties =
  1284. ARRAY_SIZE(bq2415x_power_supply_props);
  1285. bq->charger_desc.get_property = bq2415x_power_supply_get_property;
  1286. ret = bq2415x_detect_chip(bq);
  1287. if (ret < 0)
  1288. chip = BQUNKNOWN;
  1289. else
  1290. chip = ret;
  1291. ret = bq2415x_detect_revision(bq);
  1292. if (ret < 0)
  1293. strcpy(revstr, "unknown");
  1294. else
  1295. sprintf(revstr, "1.%d", ret);
  1296. bq->model = kasprintf(GFP_KERNEL,
  1297. "chip %s, revision %s, vender code %.3d",
  1298. bq2415x_chip_name[chip], revstr,
  1299. bq2415x_get_vender_code(bq));
  1300. if (!bq->model) {
  1301. dev_err(bq->dev, "failed to allocate model name\n");
  1302. return -ENOMEM;
  1303. }
  1304. bq->charger = power_supply_register(bq->dev, &bq->charger_desc,
  1305. &psy_cfg);
  1306. if (IS_ERR(bq->charger)) {
  1307. kfree(bq->model);
  1308. return PTR_ERR(bq->charger);
  1309. }
  1310. return 0;
  1311. }
  1312. /* main bq2415x probe function */
  1313. static int bq2415x_probe(struct i2c_client *client,
  1314. const struct i2c_device_id *id)
  1315. {
  1316. int ret;
  1317. int num;
  1318. char *name = NULL;
  1319. struct bq2415x_device *bq;
  1320. struct device_node *np = client->dev.of_node;
  1321. struct bq2415x_platform_data *pdata = client->dev.platform_data;
  1322. const struct acpi_device_id *acpi_id = NULL;
  1323. struct power_supply *notify_psy = NULL;
  1324. union power_supply_propval prop;
  1325. if (!np && !pdata && !ACPI_HANDLE(&client->dev)) {
  1326. dev_err(&client->dev, "Neither devicetree, nor platform data, nor ACPI support\n");
  1327. return -ENODEV;
  1328. }
  1329. /* Get new ID for the new device */
  1330. mutex_lock(&bq2415x_id_mutex);
  1331. num = idr_alloc(&bq2415x_id, client, 0, 0, GFP_KERNEL);
  1332. mutex_unlock(&bq2415x_id_mutex);
  1333. if (num < 0)
  1334. return num;
  1335. if (id) {
  1336. name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
  1337. } else if (ACPI_HANDLE(&client->dev)) {
  1338. acpi_id =
  1339. acpi_match_device(client->dev.driver->acpi_match_table,
  1340. &client->dev);
  1341. if (!acpi_id) {
  1342. dev_err(&client->dev, "failed to match device name\n");
  1343. ret = -ENODEV;
  1344. goto error_1;
  1345. }
  1346. name = kasprintf(GFP_KERNEL, "%s-%d", acpi_id->id, num);
  1347. }
  1348. if (!name) {
  1349. dev_err(&client->dev, "failed to allocate device name\n");
  1350. ret = -ENOMEM;
  1351. goto error_1;
  1352. }
  1353. bq = devm_kzalloc(&client->dev, sizeof(*bq), GFP_KERNEL);
  1354. if (!bq) {
  1355. ret = -ENOMEM;
  1356. goto error_2;
  1357. }
  1358. i2c_set_clientdata(client, bq);
  1359. bq->id = num;
  1360. bq->dev = &client->dev;
  1361. if (id)
  1362. bq->chip = id->driver_data;
  1363. else if (ACPI_HANDLE(bq->dev))
  1364. bq->chip = acpi_id->driver_data;
  1365. bq->name = name;
  1366. bq->mode = BQ2415X_MODE_OFF;
  1367. bq->reported_mode = BQ2415X_MODE_OFF;
  1368. bq->autotimer = 0;
  1369. bq->automode = 0;
  1370. if (np || ACPI_HANDLE(bq->dev)) {
  1371. ret = device_property_read_u32(bq->dev,
  1372. "ti,current-limit",
  1373. &bq->init_data.current_limit);
  1374. if (ret)
  1375. goto error_2;
  1376. ret = device_property_read_u32(bq->dev,
  1377. "ti,weak-battery-voltage",
  1378. &bq->init_data.weak_battery_voltage);
  1379. if (ret)
  1380. goto error_2;
  1381. ret = device_property_read_u32(bq->dev,
  1382. "ti,battery-regulation-voltage",
  1383. &bq->init_data.battery_regulation_voltage);
  1384. if (ret)
  1385. goto error_2;
  1386. ret = device_property_read_u32(bq->dev,
  1387. "ti,charge-current",
  1388. &bq->init_data.charge_current);
  1389. if (ret)
  1390. goto error_2;
  1391. ret = device_property_read_u32(bq->dev,
  1392. "ti,termination-current",
  1393. &bq->init_data.termination_current);
  1394. if (ret)
  1395. goto error_2;
  1396. ret = device_property_read_u32(bq->dev,
  1397. "ti,resistor-sense",
  1398. &bq->init_data.resistor_sense);
  1399. if (ret)
  1400. goto error_2;
  1401. if (np)
  1402. bq->notify_node = of_parse_phandle(np,
  1403. "ti,usb-charger-detection", 0);
  1404. } else {
  1405. memcpy(&bq->init_data, pdata, sizeof(bq->init_data));
  1406. }
  1407. bq2415x_reset_chip(bq);
  1408. ret = bq2415x_power_supply_init(bq);
  1409. if (ret) {
  1410. dev_err(bq->dev, "failed to register power supply: %d\n", ret);
  1411. goto error_2;
  1412. }
  1413. ret = bq2415x_set_defaults(bq);
  1414. if (ret) {
  1415. dev_err(bq->dev, "failed to set default values: %d\n", ret);
  1416. goto error_3;
  1417. }
  1418. if (bq->notify_node || bq->init_data.notify_device) {
  1419. bq->nb.notifier_call = bq2415x_notifier_call;
  1420. ret = power_supply_reg_notifier(&bq->nb);
  1421. if (ret) {
  1422. dev_err(bq->dev, "failed to reg notifier: %d\n", ret);
  1423. goto error_3;
  1424. }
  1425. bq->automode = 1;
  1426. dev_info(bq->dev, "automode supported, waiting for events\n");
  1427. } else {
  1428. bq->automode = -1;
  1429. dev_info(bq->dev, "automode not supported\n");
  1430. }
  1431. /* Query for initial reported_mode and set it */
  1432. if (bq->nb.notifier_call) {
  1433. if (np) {
  1434. notify_psy = power_supply_get_by_phandle(np,
  1435. "ti,usb-charger-detection");
  1436. if (IS_ERR(notify_psy))
  1437. notify_psy = NULL;
  1438. } else if (bq->init_data.notify_device) {
  1439. notify_psy = power_supply_get_by_name(
  1440. bq->init_data.notify_device);
  1441. }
  1442. }
  1443. if (notify_psy) {
  1444. ret = power_supply_get_property(notify_psy,
  1445. POWER_SUPPLY_PROP_CURRENT_MAX, &prop);
  1446. power_supply_put(notify_psy);
  1447. if (ret == 0) {
  1448. bq2415x_update_reported_mode(bq, prop.intval);
  1449. bq2415x_set_mode(bq, bq->reported_mode);
  1450. }
  1451. }
  1452. INIT_DELAYED_WORK(&bq->work, bq2415x_timer_work);
  1453. bq2415x_set_autotimer(bq, 1);
  1454. dev_info(bq->dev, "driver registered\n");
  1455. return 0;
  1456. error_3:
  1457. bq2415x_power_supply_exit(bq);
  1458. error_2:
  1459. if (bq)
  1460. of_node_put(bq->notify_node);
  1461. kfree(name);
  1462. error_1:
  1463. mutex_lock(&bq2415x_id_mutex);
  1464. idr_remove(&bq2415x_id, num);
  1465. mutex_unlock(&bq2415x_id_mutex);
  1466. return ret;
  1467. }
  1468. /* main bq2415x remove function */
  1469. static int bq2415x_remove(struct i2c_client *client)
  1470. {
  1471. struct bq2415x_device *bq = i2c_get_clientdata(client);
  1472. if (bq->nb.notifier_call)
  1473. power_supply_unreg_notifier(&bq->nb);
  1474. of_node_put(bq->notify_node);
  1475. bq2415x_power_supply_exit(bq);
  1476. bq2415x_reset_chip(bq);
  1477. mutex_lock(&bq2415x_id_mutex);
  1478. idr_remove(&bq2415x_id, bq->id);
  1479. mutex_unlock(&bq2415x_id_mutex);
  1480. dev_info(bq->dev, "driver unregistered\n");
  1481. kfree(bq->name);
  1482. return 0;
  1483. }
  1484. static const struct i2c_device_id bq2415x_i2c_id_table[] = {
  1485. { "bq2415x", BQUNKNOWN },
  1486. { "bq24150", BQ24150 },
  1487. { "bq24150a", BQ24150A },
  1488. { "bq24151", BQ24151 },
  1489. { "bq24151a", BQ24151A },
  1490. { "bq24152", BQ24152 },
  1491. { "bq24153", BQ24153 },
  1492. { "bq24153a", BQ24153A },
  1493. { "bq24155", BQ24155 },
  1494. { "bq24156", BQ24156 },
  1495. { "bq24156a", BQ24156A },
  1496. { "bq24157s", BQ24157S },
  1497. { "bq24158", BQ24158 },
  1498. {},
  1499. };
  1500. MODULE_DEVICE_TABLE(i2c, bq2415x_i2c_id_table);
  1501. #ifdef CONFIG_ACPI
  1502. static const struct acpi_device_id bq2415x_i2c_acpi_match[] = {
  1503. { "BQ2415X", BQUNKNOWN },
  1504. { "BQ241500", BQ24150 },
  1505. { "BQA24150", BQ24150A },
  1506. { "BQ241510", BQ24151 },
  1507. { "BQA24151", BQ24151A },
  1508. { "BQ241520", BQ24152 },
  1509. { "BQ241530", BQ24153 },
  1510. { "BQA24153", BQ24153A },
  1511. { "BQ241550", BQ24155 },
  1512. { "BQ241560", BQ24156 },
  1513. { "BQA24156", BQ24156A },
  1514. { "BQS24157", BQ24157S },
  1515. { "BQ241580", BQ24158 },
  1516. {},
  1517. };
  1518. MODULE_DEVICE_TABLE(acpi, bq2415x_i2c_acpi_match);
  1519. #endif
  1520. #ifdef CONFIG_OF
  1521. static const struct of_device_id bq2415x_of_match_table[] = {
  1522. { .compatible = "ti,bq24150" },
  1523. { .compatible = "ti,bq24150a" },
  1524. { .compatible = "ti,bq24151" },
  1525. { .compatible = "ti,bq24151a" },
  1526. { .compatible = "ti,bq24152" },
  1527. { .compatible = "ti,bq24153" },
  1528. { .compatible = "ti,bq24153a" },
  1529. { .compatible = "ti,bq24155" },
  1530. { .compatible = "ti,bq24156" },
  1531. { .compatible = "ti,bq24156a" },
  1532. { .compatible = "ti,bq24157s" },
  1533. { .compatible = "ti,bq24158" },
  1534. {},
  1535. };
  1536. MODULE_DEVICE_TABLE(of, bq2415x_of_match_table);
  1537. #endif
  1538. static struct i2c_driver bq2415x_driver = {
  1539. .driver = {
  1540. .name = "bq2415x-charger",
  1541. .of_match_table = of_match_ptr(bq2415x_of_match_table),
  1542. .acpi_match_table = ACPI_PTR(bq2415x_i2c_acpi_match),
  1543. },
  1544. .probe = bq2415x_probe,
  1545. .remove = bq2415x_remove,
  1546. .id_table = bq2415x_i2c_id_table,
  1547. };
  1548. module_i2c_driver(bq2415x_driver);
  1549. MODULE_AUTHOR("Pali Rohár <pali@kernel.org>");
  1550. MODULE_DESCRIPTION("bq2415x charger driver");
  1551. MODULE_LICENSE("GPL");