lm3639_bl.c 10 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Simple driver for Texas Instruments LM3639 Backlight + Flash LED driver chip
  4. * Copyright (C) 2012 Texas Instruments
  5. */
  6. #include <linux/module.h>
  7. #include <linux/slab.h>
  8. #include <linux/i2c.h>
  9. #include <linux/leds.h>
  10. #include <linux/backlight.h>
  11. #include <linux/err.h>
  12. #include <linux/delay.h>
  13. #include <linux/uaccess.h>
  14. #include <linux/interrupt.h>
  15. #include <linux/regmap.h>
  16. #include <linux/platform_data/lm3639_bl.h>
  17. #define REG_DEV_ID 0x00
  18. #define REG_CHECKSUM 0x01
  19. #define REG_BL_CONF_1 0x02
  20. #define REG_BL_CONF_2 0x03
  21. #define REG_BL_CONF_3 0x04
  22. #define REG_BL_CONF_4 0x05
  23. #define REG_FL_CONF_1 0x06
  24. #define REG_FL_CONF_2 0x07
  25. #define REG_FL_CONF_3 0x08
  26. #define REG_IO_CTRL 0x09
  27. #define REG_ENABLE 0x0A
  28. #define REG_FLAG 0x0B
  29. #define REG_MAX REG_FLAG
  30. struct lm3639_chip_data {
  31. struct device *dev;
  32. struct lm3639_platform_data *pdata;
  33. struct backlight_device *bled;
  34. struct led_classdev cdev_flash;
  35. struct led_classdev cdev_torch;
  36. struct regmap *regmap;
  37. unsigned int bled_mode;
  38. unsigned int bled_map;
  39. unsigned int last_flag;
  40. };
  41. /* initialize chip */
  42. static int lm3639_chip_init(struct lm3639_chip_data *pchip)
  43. {
  44. int ret;
  45. unsigned int reg_val;
  46. struct lm3639_platform_data *pdata = pchip->pdata;
  47. /* input pins config. */
  48. ret =
  49. regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08,
  50. pdata->pin_pwm);
  51. if (ret < 0)
  52. goto out;
  53. reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx;
  54. ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val);
  55. if (ret < 0)
  56. goto out;
  57. /* init brightness */
  58. ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led);
  59. if (ret < 0)
  60. goto out;
  61. ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led);
  62. if (ret < 0)
  63. goto out;
  64. /* output pins config. */
  65. if (!pdata->init_brt_led) {
  66. reg_val = pdata->fled_pins;
  67. reg_val |= pdata->bled_pins;
  68. } else {
  69. reg_val = pdata->fled_pins;
  70. reg_val |= pdata->bled_pins | 0x01;
  71. }
  72. ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val);
  73. if (ret < 0)
  74. goto out;
  75. return ret;
  76. out:
  77. dev_err(pchip->dev, "i2c failed to access register\n");
  78. return ret;
  79. }
  80. /* update and get brightness */
  81. static int lm3639_bled_update_status(struct backlight_device *bl)
  82. {
  83. int ret;
  84. unsigned int reg_val;
  85. struct lm3639_chip_data *pchip = bl_get_data(bl);
  86. struct lm3639_platform_data *pdata = pchip->pdata;
  87. ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);
  88. if (ret < 0)
  89. goto out;
  90. if (reg_val != 0)
  91. dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
  92. /* pwm control */
  93. if (pdata->pin_pwm) {
  94. if (pdata->pwm_set_intensity)
  95. pdata->pwm_set_intensity(bl->props.brightness,
  96. pdata->max_brt_led);
  97. else
  98. dev_err(pchip->dev,
  99. "No pwm control func. in plat-data\n");
  100. return bl->props.brightness;
  101. }
  102. /* i2c control and set brigtness */
  103. ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness);
  104. if (ret < 0)
  105. goto out;
  106. ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness);
  107. if (ret < 0)
  108. goto out;
  109. if (!bl->props.brightness)
  110. ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00);
  111. else
  112. ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01);
  113. if (ret < 0)
  114. goto out;
  115. return bl->props.brightness;
  116. out:
  117. dev_err(pchip->dev, "i2c failed to access registers\n");
  118. return bl->props.brightness;
  119. }
  120. static int lm3639_bled_get_brightness(struct backlight_device *bl)
  121. {
  122. int ret;
  123. unsigned int reg_val;
  124. struct lm3639_chip_data *pchip = bl_get_data(bl);
  125. struct lm3639_platform_data *pdata = pchip->pdata;
  126. if (pdata->pin_pwm) {
  127. if (pdata->pwm_get_intensity)
  128. bl->props.brightness = pdata->pwm_get_intensity();
  129. else
  130. dev_err(pchip->dev,
  131. "No pwm control func. in plat-data\n");
  132. return bl->props.brightness;
  133. }
  134. ret = regmap_read(pchip->regmap, REG_BL_CONF_1, &reg_val);
  135. if (ret < 0)
  136. goto out;
  137. if (reg_val & 0x10)
  138. ret = regmap_read(pchip->regmap, REG_BL_CONF_4, &reg_val);
  139. else
  140. ret = regmap_read(pchip->regmap, REG_BL_CONF_3, &reg_val);
  141. if (ret < 0)
  142. goto out;
  143. bl->props.brightness = reg_val;
  144. return bl->props.brightness;
  145. out:
  146. dev_err(pchip->dev, "i2c failed to access register\n");
  147. return bl->props.brightness;
  148. }
  149. static const struct backlight_ops lm3639_bled_ops = {
  150. .options = BL_CORE_SUSPENDRESUME,
  151. .update_status = lm3639_bled_update_status,
  152. .get_brightness = lm3639_bled_get_brightness,
  153. };
  154. /* backlight mapping mode */
  155. static ssize_t lm3639_bled_mode_store(struct device *dev,
  156. struct device_attribute *devAttr,
  157. const char *buf, size_t size)
  158. {
  159. ssize_t ret;
  160. struct lm3639_chip_data *pchip = dev_get_drvdata(dev);
  161. unsigned int state;
  162. ret = kstrtouint(buf, 10, &state);
  163. if (ret)
  164. goto out_input;
  165. if (!state)
  166. ret =
  167. regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
  168. 0x00);
  169. else
  170. ret =
  171. regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
  172. 0x10);
  173. if (ret < 0)
  174. goto out;
  175. return size;
  176. out:
  177. dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__);
  178. return ret;
  179. out_input:
  180. dev_err(pchip->dev, "%s:input conversion fail\n", __func__);
  181. return ret;
  182. }
  183. static DEVICE_ATTR(bled_mode, S_IWUSR, NULL, lm3639_bled_mode_store);
  184. /* torch */
  185. static void lm3639_torch_brightness_set(struct led_classdev *cdev,
  186. enum led_brightness brightness)
  187. {
  188. int ret;
  189. unsigned int reg_val;
  190. struct lm3639_chip_data *pchip;
  191. pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch);
  192. ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);
  193. if (ret < 0)
  194. goto out;
  195. if (reg_val != 0)
  196. dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
  197. /* brightness 0 means off state */
  198. if (!brightness) {
  199. ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
  200. if (ret < 0)
  201. goto out;
  202. return;
  203. }
  204. ret = regmap_update_bits(pchip->regmap,
  205. REG_FL_CONF_1, 0x70, (brightness - 1) << 4);
  206. if (ret < 0)
  207. goto out;
  208. ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02);
  209. if (ret < 0)
  210. goto out;
  211. return;
  212. out:
  213. dev_err(pchip->dev, "i2c failed to access register\n");
  214. }
  215. /* flash */
  216. static void lm3639_flash_brightness_set(struct led_classdev *cdev,
  217. enum led_brightness brightness)
  218. {
  219. int ret;
  220. unsigned int reg_val;
  221. struct lm3639_chip_data *pchip;
  222. pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash);
  223. ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);
  224. if (ret < 0)
  225. goto out;
  226. if (reg_val != 0)
  227. dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);
  228. /* torch off before flash control */
  229. ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
  230. if (ret < 0)
  231. goto out;
  232. /* brightness 0 means off state */
  233. if (!brightness)
  234. return;
  235. ret = regmap_update_bits(pchip->regmap,
  236. REG_FL_CONF_1, 0x0F, brightness - 1);
  237. if (ret < 0)
  238. goto out;
  239. ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06);
  240. if (ret < 0)
  241. goto out;
  242. return;
  243. out:
  244. dev_err(pchip->dev, "i2c failed to access register\n");
  245. }
  246. static const struct regmap_config lm3639_regmap = {
  247. .reg_bits = 8,
  248. .val_bits = 8,
  249. .max_register = REG_MAX,
  250. };
  251. static int lm3639_probe(struct i2c_client *client,
  252. const struct i2c_device_id *id)
  253. {
  254. int ret;
  255. struct lm3639_chip_data *pchip;
  256. struct lm3639_platform_data *pdata = dev_get_platdata(&client->dev);
  257. struct backlight_properties props;
  258. if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
  259. dev_err(&client->dev, "i2c functionality check fail.\n");
  260. return -EOPNOTSUPP;
  261. }
  262. if (pdata == NULL) {
  263. dev_err(&client->dev, "Needs Platform Data.\n");
  264. return -ENODATA;
  265. }
  266. pchip = devm_kzalloc(&client->dev,
  267. sizeof(struct lm3639_chip_data), GFP_KERNEL);
  268. if (!pchip)
  269. return -ENOMEM;
  270. pchip->pdata = pdata;
  271. pchip->dev = &client->dev;
  272. pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap);
  273. if (IS_ERR(pchip->regmap)) {
  274. ret = PTR_ERR(pchip->regmap);
  275. dev_err(&client->dev, "fail : allocate register map: %d\n",
  276. ret);
  277. return ret;
  278. }
  279. i2c_set_clientdata(client, pchip);
  280. /* chip initialize */
  281. ret = lm3639_chip_init(pchip);
  282. if (ret < 0) {
  283. dev_err(&client->dev, "fail : chip init\n");
  284. goto err_out;
  285. }
  286. /* backlight */
  287. props.type = BACKLIGHT_RAW;
  288. props.brightness = pdata->init_brt_led;
  289. props.max_brightness = pdata->max_brt_led;
  290. pchip->bled =
  291. devm_backlight_device_register(pchip->dev, "lm3639_bled",
  292. pchip->dev, pchip, &lm3639_bled_ops,
  293. &props);
  294. if (IS_ERR(pchip->bled)) {
  295. dev_err(&client->dev, "fail : backlight register\n");
  296. ret = PTR_ERR(pchip->bled);
  297. goto err_out;
  298. }
  299. ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode);
  300. if (ret < 0) {
  301. dev_err(&client->dev, "failed : add sysfs entries\n");
  302. goto err_out;
  303. }
  304. /* flash */
  305. pchip->cdev_flash.name = "lm3639_flash";
  306. pchip->cdev_flash.max_brightness = 16;
  307. pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set;
  308. ret = led_classdev_register((struct device *)
  309. &client->dev, &pchip->cdev_flash);
  310. if (ret < 0) {
  311. dev_err(&client->dev, "fail : flash register\n");
  312. goto err_flash;
  313. }
  314. /* torch */
  315. pchip->cdev_torch.name = "lm3639_torch";
  316. pchip->cdev_torch.max_brightness = 8;
  317. pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set;
  318. ret = led_classdev_register((struct device *)
  319. &client->dev, &pchip->cdev_torch);
  320. if (ret < 0) {
  321. dev_err(&client->dev, "fail : torch register\n");
  322. goto err_torch;
  323. }
  324. return 0;
  325. err_torch:
  326. led_classdev_unregister(&pchip->cdev_flash);
  327. err_flash:
  328. device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
  329. err_out:
  330. return ret;
  331. }
  332. static int lm3639_remove(struct i2c_client *client)
  333. {
  334. struct lm3639_chip_data *pchip = i2c_get_clientdata(client);
  335. regmap_write(pchip->regmap, REG_ENABLE, 0x00);
  336. led_classdev_unregister(&pchip->cdev_torch);
  337. led_classdev_unregister(&pchip->cdev_flash);
  338. if (pchip->bled)
  339. device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
  340. return 0;
  341. }
  342. static const struct i2c_device_id lm3639_id[] = {
  343. {LM3639_NAME, 0},
  344. {}
  345. };
  346. MODULE_DEVICE_TABLE(i2c, lm3639_id);
  347. static struct i2c_driver lm3639_i2c_driver = {
  348. .driver = {
  349. .name = LM3639_NAME,
  350. },
  351. .probe = lm3639_probe,
  352. .remove = lm3639_remove,
  353. .id_table = lm3639_id,
  354. };
  355. module_i2c_driver(lm3639_i2c_driver);
  356. MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639");
  357. MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
  358. MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
  359. MODULE_LICENSE("GPL v2");