max14656_charger_detector.c 8.0 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Maxim MAX14656 / AL32 USB Charger Detector driver
  4. *
  5. * Copyright (C) 2014 LG Electronics, Inc
  6. * Copyright (C) 2016 Alexander Kurz <akurz@blala.de>
  7. *
  8. * Components from Maxim AL32 Charger detection Driver for MX50 Yoshi Board
  9. * Copyright (C) Amazon Technologies Inc. All rights reserved.
  10. * Manish Lachwani (lachwani@lab126.com)
  11. */
  12. #include <linux/module.h>
  13. #include <linux/init.h>
  14. #include <linux/delay.h>
  15. #include <linux/i2c.h>
  16. #include <linux/interrupt.h>
  17. #include <linux/slab.h>
  18. #include <linux/gpio.h>
  19. #include <linux/of_gpio.h>
  20. #include <linux/of_device.h>
  21. #include <linux/workqueue.h>
  22. #include <linux/power_supply.h>
  23. #define MAX14656_MANUFACTURER "Maxim Integrated"
  24. #define MAX14656_NAME "max14656"
  25. #define MAX14656_DEVICE_ID 0x00
  26. #define MAX14656_INTERRUPT_1 0x01
  27. #define MAX14656_INTERRUPT_2 0x02
  28. #define MAX14656_STATUS_1 0x03
  29. #define MAX14656_STATUS_2 0x04
  30. #define MAX14656_INTMASK_1 0x05
  31. #define MAX14656_INTMASK_2 0x06
  32. #define MAX14656_CONTROL_1 0x07
  33. #define MAX14656_CONTROL_2 0x08
  34. #define MAX14656_CONTROL_3 0x09
  35. #define DEVICE_VENDOR_MASK 0xf0
  36. #define DEVICE_REV_MASK 0x0f
  37. #define INT_EN_REG_MASK BIT(4)
  38. #define CHG_TYPE_INT_MASK BIT(0)
  39. #define STATUS1_VB_VALID_MASK BIT(4)
  40. #define STATUS1_CHG_TYPE_MASK 0xf
  41. #define INT1_DCD_TIMEOUT_MASK BIT(7)
  42. #define CONTROL1_DEFAULT 0x0d
  43. #define CONTROL1_INT_EN BIT(4)
  44. #define CONTROL1_INT_ACTIVE_HIGH BIT(5)
  45. #define CONTROL1_EDGE BIT(7)
  46. #define CONTROL2_DEFAULT 0x8e
  47. #define CONTROL2_ADC_EN BIT(0)
  48. #define CONTROL3_DEFAULT 0x8d
  49. enum max14656_chg_type {
  50. MAX14656_NO_CHARGER = 0,
  51. MAX14656_SDP_CHARGER,
  52. MAX14656_CDP_CHARGER,
  53. MAX14656_DCP_CHARGER,
  54. MAX14656_APPLE_500MA_CHARGER,
  55. MAX14656_APPLE_1A_CHARGER,
  56. MAX14656_APPLE_2A_CHARGER,
  57. MAX14656_SPECIAL_500MA_CHARGER,
  58. MAX14656_APPLE_12W,
  59. MAX14656_CHARGER_LAST
  60. };
  61. static const struct max14656_chg_type_props {
  62. enum power_supply_type type;
  63. } chg_type_props[] = {
  64. { POWER_SUPPLY_TYPE_UNKNOWN },
  65. { POWER_SUPPLY_TYPE_USB },
  66. { POWER_SUPPLY_TYPE_USB_CDP },
  67. { POWER_SUPPLY_TYPE_USB_DCP },
  68. { POWER_SUPPLY_TYPE_USB_DCP },
  69. { POWER_SUPPLY_TYPE_USB_DCP },
  70. { POWER_SUPPLY_TYPE_USB_DCP },
  71. { POWER_SUPPLY_TYPE_USB_DCP },
  72. { POWER_SUPPLY_TYPE_USB },
  73. };
  74. struct max14656_chip {
  75. struct i2c_client *client;
  76. struct power_supply *detect_psy;
  77. struct power_supply_desc psy_desc;
  78. struct delayed_work irq_work;
  79. int irq;
  80. int online;
  81. };
  82. static int max14656_read_reg(struct i2c_client *client, int reg, u8 *val)
  83. {
  84. s32 ret;
  85. ret = i2c_smbus_read_byte_data(client, reg);
  86. if (ret < 0) {
  87. dev_err(&client->dev,
  88. "i2c read fail: can't read from %02x: %d\n",
  89. reg, ret);
  90. return ret;
  91. }
  92. *val = ret;
  93. return 0;
  94. }
  95. static int max14656_write_reg(struct i2c_client *client, int reg, u8 val)
  96. {
  97. s32 ret;
  98. ret = i2c_smbus_write_byte_data(client, reg, val);
  99. if (ret < 0) {
  100. dev_err(&client->dev,
  101. "i2c write fail: can't write %02x to %02x: %d\n",
  102. val, reg, ret);
  103. return ret;
  104. }
  105. return 0;
  106. }
  107. static int max14656_read_block_reg(struct i2c_client *client, u8 reg,
  108. u8 length, u8 *val)
  109. {
  110. int ret;
  111. ret = i2c_smbus_read_i2c_block_data(client, reg, length, val);
  112. if (ret < 0) {
  113. dev_err(&client->dev, "failed to block read reg 0x%x: %d\n",
  114. reg, ret);
  115. return ret;
  116. }
  117. return 0;
  118. }
  119. #define REG_TOTAL_NUM 5
  120. static void max14656_irq_worker(struct work_struct *work)
  121. {
  122. struct max14656_chip *chip =
  123. container_of(work, struct max14656_chip, irq_work.work);
  124. u8 buf[REG_TOTAL_NUM];
  125. u8 chg_type;
  126. max14656_read_block_reg(chip->client, MAX14656_DEVICE_ID,
  127. REG_TOTAL_NUM, buf);
  128. if ((buf[MAX14656_STATUS_1] & STATUS1_VB_VALID_MASK) &&
  129. (buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK)) {
  130. chg_type = buf[MAX14656_STATUS_1] & STATUS1_CHG_TYPE_MASK;
  131. if (chg_type < MAX14656_CHARGER_LAST)
  132. chip->psy_desc.type = chg_type_props[chg_type].type;
  133. else
  134. chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
  135. chip->online = 1;
  136. } else {
  137. chip->online = 0;
  138. chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
  139. }
  140. power_supply_changed(chip->detect_psy);
  141. }
  142. static irqreturn_t max14656_irq(int irq, void *dev_id)
  143. {
  144. struct max14656_chip *chip = dev_id;
  145. schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(100));
  146. return IRQ_HANDLED;
  147. }
  148. static int max14656_hw_init(struct max14656_chip *chip)
  149. {
  150. uint8_t val = 0;
  151. uint8_t rev;
  152. struct i2c_client *client = chip->client;
  153. if (max14656_read_reg(client, MAX14656_DEVICE_ID, &val))
  154. return -ENODEV;
  155. if ((val & DEVICE_VENDOR_MASK) != 0x20) {
  156. dev_err(&client->dev, "wrong vendor ID %d\n",
  157. ((val & DEVICE_VENDOR_MASK) >> 4));
  158. return -ENODEV;
  159. }
  160. rev = val & DEVICE_REV_MASK;
  161. /* Turn on ADC_EN */
  162. if (max14656_write_reg(client, MAX14656_CONTROL_2, CONTROL2_ADC_EN))
  163. return -EINVAL;
  164. /* turn on interrupts and low power mode */
  165. if (max14656_write_reg(client, MAX14656_CONTROL_1,
  166. CONTROL1_DEFAULT |
  167. CONTROL1_INT_EN |
  168. CONTROL1_INT_ACTIVE_HIGH |
  169. CONTROL1_EDGE))
  170. return -EINVAL;
  171. if (max14656_write_reg(client, MAX14656_INTMASK_1, 0x3))
  172. return -EINVAL;
  173. if (max14656_write_reg(client, MAX14656_INTMASK_2, 0x1))
  174. return -EINVAL;
  175. dev_info(&client->dev, "detected revision %d\n", rev);
  176. return 0;
  177. }
  178. static int max14656_get_property(struct power_supply *psy,
  179. enum power_supply_property psp,
  180. union power_supply_propval *val)
  181. {
  182. struct max14656_chip *chip = power_supply_get_drvdata(psy);
  183. switch (psp) {
  184. case POWER_SUPPLY_PROP_ONLINE:
  185. val->intval = chip->online;
  186. break;
  187. case POWER_SUPPLY_PROP_MODEL_NAME:
  188. val->strval = MAX14656_NAME;
  189. break;
  190. case POWER_SUPPLY_PROP_MANUFACTURER:
  191. val->strval = MAX14656_MANUFACTURER;
  192. break;
  193. default:
  194. return -EINVAL;
  195. }
  196. return 0;
  197. }
  198. static enum power_supply_property max14656_battery_props[] = {
  199. POWER_SUPPLY_PROP_ONLINE,
  200. POWER_SUPPLY_PROP_MODEL_NAME,
  201. POWER_SUPPLY_PROP_MANUFACTURER,
  202. };
  203. static void stop_irq_work(void *data)
  204. {
  205. struct max14656_chip *chip = data;
  206. cancel_delayed_work_sync(&chip->irq_work);
  207. }
  208. static int max14656_probe(struct i2c_client *client,
  209. const struct i2c_device_id *id)
  210. {
  211. struct i2c_adapter *adapter = client->adapter;
  212. struct device *dev = &client->dev;
  213. struct power_supply_config psy_cfg = {};
  214. struct max14656_chip *chip;
  215. int irq = client->irq;
  216. int ret = 0;
  217. if (irq <= 0) {
  218. dev_err(dev, "invalid irq number: %d\n", irq);
  219. return -ENODEV;
  220. }
  221. if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
  222. dev_err(dev, "No support for SMBUS_BYTE_DATA\n");
  223. return -ENODEV;
  224. }
  225. chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
  226. if (!chip)
  227. return -ENOMEM;
  228. psy_cfg.drv_data = chip;
  229. chip->client = client;
  230. chip->online = 0;
  231. chip->psy_desc.name = MAX14656_NAME;
  232. chip->psy_desc.type = POWER_SUPPLY_TYPE_UNKNOWN;
  233. chip->psy_desc.properties = max14656_battery_props;
  234. chip->psy_desc.num_properties = ARRAY_SIZE(max14656_battery_props);
  235. chip->psy_desc.get_property = max14656_get_property;
  236. chip->irq = irq;
  237. ret = max14656_hw_init(chip);
  238. if (ret)
  239. return -ENODEV;
  240. chip->detect_psy = devm_power_supply_register(dev,
  241. &chip->psy_desc, &psy_cfg);
  242. if (IS_ERR(chip->detect_psy)) {
  243. dev_err(dev, "power_supply_register failed\n");
  244. return -EINVAL;
  245. }
  246. INIT_DELAYED_WORK(&chip->irq_work, max14656_irq_worker);
  247. ret = devm_add_action(dev, stop_irq_work, chip);
  248. if (ret) {
  249. dev_err(dev, "devm_add_action %d failed\n", ret);
  250. return ret;
  251. }
  252. ret = devm_request_irq(dev, chip->irq, max14656_irq,
  253. IRQF_TRIGGER_FALLING,
  254. MAX14656_NAME, chip);
  255. if (ret) {
  256. dev_err(dev, "request_irq %d failed\n", chip->irq);
  257. return -EINVAL;
  258. }
  259. enable_irq_wake(chip->irq);
  260. schedule_delayed_work(&chip->irq_work, msecs_to_jiffies(2000));
  261. return 0;
  262. }
  263. static const struct i2c_device_id max14656_id[] = {
  264. { "max14656", 0 },
  265. {}
  266. };
  267. MODULE_DEVICE_TABLE(i2c, max14656_id);
  268. static const struct of_device_id max14656_match_table[] = {
  269. { .compatible = "maxim,max14656", },
  270. {}
  271. };
  272. MODULE_DEVICE_TABLE(of, max14656_match_table);
  273. static struct i2c_driver max14656_i2c_driver = {
  274. .driver = {
  275. .name = "max14656",
  276. .of_match_table = max14656_match_table,
  277. },
  278. .probe = max14656_probe,
  279. .id_table = max14656_id,
  280. };
  281. module_i2c_driver(max14656_i2c_driver);
  282. MODULE_DESCRIPTION("MAX14656 USB charger detector");
  283. MODULE_LICENSE("GPL v2");