bq27xxx_battery_i2c.c 6.8 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306
  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * BQ27xxx battery monitor I2C driver
  4. *
  5. * Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/
  6. * Andrew F. Davis <afd@ti.com>
  7. */
  8. #include <linux/i2c.h>
  9. #include <linux/interrupt.h>
  10. #include <linux/module.h>
  11. #include <asm/unaligned.h>
  12. #include <linux/power/bq27xxx_battery.h>
  13. static DEFINE_IDR(battery_id);
  14. static DEFINE_MUTEX(battery_mutex);
  15. static irqreturn_t bq27xxx_battery_irq_handler_thread(int irq, void *data)
  16. {
  17. struct bq27xxx_device_info *di = data;
  18. bq27xxx_battery_update(di);
  19. return IRQ_HANDLED;
  20. }
  21. static int bq27xxx_battery_i2c_read(struct bq27xxx_device_info *di, u8 reg,
  22. bool single)
  23. {
  24. struct i2c_client *client = to_i2c_client(di->dev);
  25. struct i2c_msg msg[2];
  26. u8 data[2];
  27. int ret;
  28. if (!client->adapter)
  29. return -ENODEV;
  30. msg[0].addr = client->addr;
  31. msg[0].flags = 0;
  32. msg[0].buf = &reg;
  33. msg[0].len = sizeof(reg);
  34. msg[1].addr = client->addr;
  35. msg[1].flags = I2C_M_RD;
  36. msg[1].buf = data;
  37. if (single)
  38. msg[1].len = 1;
  39. else
  40. msg[1].len = 2;
  41. ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
  42. if (ret < 0)
  43. return ret;
  44. if (!single)
  45. ret = get_unaligned_le16(data);
  46. else
  47. ret = data[0];
  48. return ret;
  49. }
  50. static int bq27xxx_battery_i2c_write(struct bq27xxx_device_info *di, u8 reg,
  51. int value, bool single)
  52. {
  53. struct i2c_client *client = to_i2c_client(di->dev);
  54. struct i2c_msg msg;
  55. u8 data[4];
  56. int ret;
  57. if (!client->adapter)
  58. return -ENODEV;
  59. data[0] = reg;
  60. if (single) {
  61. data[1] = (u8) value;
  62. msg.len = 2;
  63. } else {
  64. put_unaligned_le16(value, &data[1]);
  65. msg.len = 3;
  66. }
  67. msg.buf = data;
  68. msg.addr = client->addr;
  69. msg.flags = 0;
  70. ret = i2c_transfer(client->adapter, &msg, 1);
  71. if (ret < 0)
  72. return ret;
  73. if (ret != 1)
  74. return -EINVAL;
  75. return 0;
  76. }
  77. static int bq27xxx_battery_i2c_bulk_read(struct bq27xxx_device_info *di, u8 reg,
  78. u8 *data, int len)
  79. {
  80. struct i2c_client *client = to_i2c_client(di->dev);
  81. int ret;
  82. if (!client->adapter)
  83. return -ENODEV;
  84. ret = i2c_smbus_read_i2c_block_data(client, reg, len, data);
  85. if (ret < 0)
  86. return ret;
  87. if (ret != len)
  88. return -EINVAL;
  89. return 0;
  90. }
  91. static int bq27xxx_battery_i2c_bulk_write(struct bq27xxx_device_info *di,
  92. u8 reg, u8 *data, int len)
  93. {
  94. struct i2c_client *client = to_i2c_client(di->dev);
  95. struct i2c_msg msg;
  96. u8 buf[33];
  97. int ret;
  98. if (!client->adapter)
  99. return -ENODEV;
  100. buf[0] = reg;
  101. memcpy(&buf[1], data, len);
  102. msg.buf = buf;
  103. msg.addr = client->addr;
  104. msg.flags = 0;
  105. msg.len = len + 1;
  106. ret = i2c_transfer(client->adapter, &msg, 1);
  107. if (ret < 0)
  108. return ret;
  109. if (ret != 1)
  110. return -EINVAL;
  111. return 0;
  112. }
  113. static int bq27xxx_battery_i2c_probe(struct i2c_client *client,
  114. const struct i2c_device_id *id)
  115. {
  116. struct bq27xxx_device_info *di;
  117. int ret;
  118. char *name;
  119. int num;
  120. /* Get new ID for the new battery device */
  121. mutex_lock(&battery_mutex);
  122. num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
  123. mutex_unlock(&battery_mutex);
  124. if (num < 0)
  125. return num;
  126. name = devm_kasprintf(&client->dev, GFP_KERNEL, "%s-%d", id->name, num);
  127. if (!name)
  128. goto err_mem;
  129. di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
  130. if (!di)
  131. goto err_mem;
  132. di->id = num;
  133. di->dev = &client->dev;
  134. di->chip = id->driver_data;
  135. di->name = name;
  136. di->bus.read = bq27xxx_battery_i2c_read;
  137. di->bus.write = bq27xxx_battery_i2c_write;
  138. di->bus.read_bulk = bq27xxx_battery_i2c_bulk_read;
  139. di->bus.write_bulk = bq27xxx_battery_i2c_bulk_write;
  140. ret = bq27xxx_battery_setup(di);
  141. if (ret)
  142. goto err_failed;
  143. /* Schedule a polling after about 1 min */
  144. schedule_delayed_work(&di->work, 60 * HZ);
  145. i2c_set_clientdata(client, di);
  146. if (client->irq) {
  147. ret = devm_request_threaded_irq(&client->dev, client->irq,
  148. NULL, bq27xxx_battery_irq_handler_thread,
  149. IRQF_ONESHOT,
  150. di->name, di);
  151. if (ret) {
  152. dev_err(&client->dev,
  153. "Unable to register IRQ %d error %d\n",
  154. client->irq, ret);
  155. bq27xxx_battery_teardown(di);
  156. goto err_failed;
  157. }
  158. }
  159. return 0;
  160. err_mem:
  161. ret = -ENOMEM;
  162. err_failed:
  163. mutex_lock(&battery_mutex);
  164. idr_remove(&battery_id, num);
  165. mutex_unlock(&battery_mutex);
  166. return ret;
  167. }
  168. static int bq27xxx_battery_i2c_remove(struct i2c_client *client)
  169. {
  170. struct bq27xxx_device_info *di = i2c_get_clientdata(client);
  171. bq27xxx_battery_teardown(di);
  172. mutex_lock(&battery_mutex);
  173. idr_remove(&battery_id, di->id);
  174. mutex_unlock(&battery_mutex);
  175. return 0;
  176. }
  177. static const struct i2c_device_id bq27xxx_i2c_id_table[] = {
  178. { "bq27200", BQ27000 },
  179. { "bq27210", BQ27010 },
  180. { "bq27500", BQ2750X },
  181. { "bq27510", BQ2751X },
  182. { "bq27520", BQ2752X },
  183. { "bq27500-1", BQ27500 },
  184. { "bq27510g1", BQ27510G1 },
  185. { "bq27510g2", BQ27510G2 },
  186. { "bq27510g3", BQ27510G3 },
  187. { "bq27520g1", BQ27520G1 },
  188. { "bq27520g2", BQ27520G2 },
  189. { "bq27520g3", BQ27520G3 },
  190. { "bq27520g4", BQ27520G4 },
  191. { "bq27521", BQ27521 },
  192. { "bq27530", BQ27530 },
  193. { "bq27531", BQ27531 },
  194. { "bq27541", BQ27541 },
  195. { "bq27542", BQ27542 },
  196. { "bq27546", BQ27546 },
  197. { "bq27742", BQ27742 },
  198. { "bq27545", BQ27545 },
  199. { "bq27411", BQ27411 },
  200. { "bq27421", BQ27421 },
  201. { "bq27425", BQ27425 },
  202. { "bq27426", BQ27426 },
  203. { "bq27441", BQ27441 },
  204. { "bq27621", BQ27621 },
  205. { "bq27z561", BQ27Z561 },
  206. { "bq28z610", BQ28Z610 },
  207. { "bq34z100", BQ34Z100 },
  208. {},
  209. };
  210. MODULE_DEVICE_TABLE(i2c, bq27xxx_i2c_id_table);
  211. #ifdef CONFIG_OF
  212. static const struct of_device_id bq27xxx_battery_i2c_of_match_table[] = {
  213. { .compatible = "ti,bq27200" },
  214. { .compatible = "ti,bq27210" },
  215. { .compatible = "ti,bq27500" },
  216. { .compatible = "ti,bq27510" },
  217. { .compatible = "ti,bq27520" },
  218. { .compatible = "ti,bq27500-1" },
  219. { .compatible = "ti,bq27510g1" },
  220. { .compatible = "ti,bq27510g2" },
  221. { .compatible = "ti,bq27510g3" },
  222. { .compatible = "ti,bq27520g1" },
  223. { .compatible = "ti,bq27520g2" },
  224. { .compatible = "ti,bq27520g3" },
  225. { .compatible = "ti,bq27520g4" },
  226. { .compatible = "ti,bq27521" },
  227. { .compatible = "ti,bq27530" },
  228. { .compatible = "ti,bq27531" },
  229. { .compatible = "ti,bq27541" },
  230. { .compatible = "ti,bq27542" },
  231. { .compatible = "ti,bq27546" },
  232. { .compatible = "ti,bq27742" },
  233. { .compatible = "ti,bq27545" },
  234. { .compatible = "ti,bq27411" },
  235. { .compatible = "ti,bq27421" },
  236. { .compatible = "ti,bq27425" },
  237. { .compatible = "ti,bq27426" },
  238. { .compatible = "ti,bq27441" },
  239. { .compatible = "ti,bq27621" },
  240. { .compatible = "ti,bq27z561" },
  241. { .compatible = "ti,bq28z610" },
  242. { .compatible = "ti,bq34z100" },
  243. {},
  244. };
  245. MODULE_DEVICE_TABLE(of, bq27xxx_battery_i2c_of_match_table);
  246. #endif
  247. static struct i2c_driver bq27xxx_battery_i2c_driver = {
  248. .driver = {
  249. .name = "bq27xxx-battery",
  250. .of_match_table = of_match_ptr(bq27xxx_battery_i2c_of_match_table),
  251. },
  252. .probe = bq27xxx_battery_i2c_probe,
  253. .remove = bq27xxx_battery_i2c_remove,
  254. .id_table = bq27xxx_i2c_id_table,
  255. };
  256. module_i2c_driver(bq27xxx_battery_i2c_driver);
  257. MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
  258. MODULE_DESCRIPTION("BQ27xxx battery monitor i2c driver");
  259. MODULE_LICENSE("GPL");