lm3630a_bl.c 16 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Simple driver for Texas Instruments LM3630A Backlight 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/backlight.h>
  10. #include <linux/err.h>
  11. #include <linux/delay.h>
  12. #include <linux/uaccess.h>
  13. #include <linux/interrupt.h>
  14. #include <linux/regmap.h>
  15. #include <linux/gpio/consumer.h>
  16. #include <linux/pwm.h>
  17. #include <linux/platform_data/lm3630a_bl.h>
  18. #define REG_CTRL 0x00
  19. #define REG_BOOST 0x02
  20. #define REG_CONFIG 0x01
  21. #define REG_BRT_A 0x03
  22. #define REG_BRT_B 0x04
  23. #define REG_I_A 0x05
  24. #define REG_I_B 0x06
  25. #define REG_INT_STATUS 0x09
  26. #define REG_INT_EN 0x0A
  27. #define REG_FAULT 0x0B
  28. #define REG_PWM_OUTLOW 0x12
  29. #define REG_PWM_OUTHIGH 0x13
  30. #define REG_FILTER_STRENGTH 0x50
  31. #define REG_MAX 0x50
  32. #define INT_DEBOUNCE_MSEC 10
  33. #define LM3630A_BANK_0 0
  34. #define LM3630A_BANK_1 1
  35. #define LM3630A_NUM_SINKS 2
  36. #define LM3630A_SINK_0 0
  37. #define LM3630A_SINK_1 1
  38. struct lm3630a_chip {
  39. struct device *dev;
  40. struct delayed_work work;
  41. int irq;
  42. struct workqueue_struct *irqthread;
  43. struct lm3630a_platform_data *pdata;
  44. struct backlight_device *bleda;
  45. struct backlight_device *bledb;
  46. struct gpio_desc *enable_gpio;
  47. struct regmap *regmap;
  48. struct pwm_device *pwmd;
  49. };
  50. /* i2c access */
  51. static int lm3630a_read(struct lm3630a_chip *pchip, unsigned int reg)
  52. {
  53. int rval;
  54. unsigned int reg_val;
  55. rval = regmap_read(pchip->regmap, reg, &reg_val);
  56. if (rval < 0)
  57. return rval;
  58. return reg_val & 0xFF;
  59. }
  60. static int lm3630a_write(struct lm3630a_chip *pchip,
  61. unsigned int reg, unsigned int data)
  62. {
  63. return regmap_write(pchip->regmap, reg, data);
  64. }
  65. static int lm3630a_update(struct lm3630a_chip *pchip,
  66. unsigned int reg, unsigned int mask,
  67. unsigned int data)
  68. {
  69. return regmap_update_bits(pchip->regmap, reg, mask, data);
  70. }
  71. /* initialize chip */
  72. static int lm3630a_chip_init(struct lm3630a_chip *pchip)
  73. {
  74. int rval;
  75. struct lm3630a_platform_data *pdata = pchip->pdata;
  76. usleep_range(1000, 2000);
  77. /* set Filter Strength Register */
  78. rval = lm3630a_write(pchip, REG_FILTER_STRENGTH, 0x03);
  79. /* set Cofig. register */
  80. rval |= lm3630a_update(pchip, REG_CONFIG, 0x07, pdata->pwm_ctrl);
  81. /* set boost control */
  82. rval |= lm3630a_write(pchip, REG_BOOST, 0x38);
  83. /* set current A */
  84. rval |= lm3630a_update(pchip, REG_I_A, 0x1F, 0x1F);
  85. /* set current B */
  86. rval |= lm3630a_write(pchip, REG_I_B, 0x1F);
  87. /* set control */
  88. rval |= lm3630a_update(pchip, REG_CTRL, 0x14, pdata->leda_ctrl);
  89. rval |= lm3630a_update(pchip, REG_CTRL, 0x0B, pdata->ledb_ctrl);
  90. usleep_range(1000, 2000);
  91. /* set brightness A and B */
  92. rval |= lm3630a_write(pchip, REG_BRT_A, pdata->leda_init_brt);
  93. rval |= lm3630a_write(pchip, REG_BRT_B, pdata->ledb_init_brt);
  94. if (rval < 0)
  95. dev_err(pchip->dev, "i2c failed to access register\n");
  96. return rval;
  97. }
  98. /* interrupt handling */
  99. static void lm3630a_delayed_func(struct work_struct *work)
  100. {
  101. int rval;
  102. struct lm3630a_chip *pchip;
  103. pchip = container_of(work, struct lm3630a_chip, work.work);
  104. rval = lm3630a_read(pchip, REG_INT_STATUS);
  105. if (rval < 0) {
  106. dev_err(pchip->dev,
  107. "i2c failed to access REG_INT_STATUS Register\n");
  108. return;
  109. }
  110. dev_info(pchip->dev, "REG_INT_STATUS Register is 0x%x\n", rval);
  111. }
  112. static irqreturn_t lm3630a_isr_func(int irq, void *chip)
  113. {
  114. int rval;
  115. struct lm3630a_chip *pchip = chip;
  116. unsigned long delay = msecs_to_jiffies(INT_DEBOUNCE_MSEC);
  117. queue_delayed_work(pchip->irqthread, &pchip->work, delay);
  118. rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
  119. if (rval < 0) {
  120. dev_err(pchip->dev, "i2c failed to access register\n");
  121. return IRQ_NONE;
  122. }
  123. return IRQ_HANDLED;
  124. }
  125. static int lm3630a_intr_config(struct lm3630a_chip *pchip)
  126. {
  127. int rval;
  128. rval = lm3630a_write(pchip, REG_INT_EN, 0x87);
  129. if (rval < 0)
  130. return rval;
  131. INIT_DELAYED_WORK(&pchip->work, lm3630a_delayed_func);
  132. pchip->irqthread = create_singlethread_workqueue("lm3630a-irqthd");
  133. if (!pchip->irqthread) {
  134. dev_err(pchip->dev, "create irq thread fail\n");
  135. return -ENOMEM;
  136. }
  137. if (request_threaded_irq
  138. (pchip->irq, NULL, lm3630a_isr_func,
  139. IRQF_TRIGGER_FALLING | IRQF_ONESHOT, "lm3630a_irq", pchip)) {
  140. dev_err(pchip->dev, "request threaded irq fail\n");
  141. destroy_workqueue(pchip->irqthread);
  142. return -ENOMEM;
  143. }
  144. return rval;
  145. }
  146. static void lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
  147. {
  148. unsigned int period = pchip->pdata->pwm_period;
  149. unsigned int duty = br * period / br_max;
  150. pwm_config(pchip->pwmd, duty, period);
  151. if (duty)
  152. pwm_enable(pchip->pwmd);
  153. else
  154. pwm_disable(pchip->pwmd);
  155. }
  156. /* update and get brightness */
  157. static int lm3630a_bank_a_update_status(struct backlight_device *bl)
  158. {
  159. int ret;
  160. struct lm3630a_chip *pchip = bl_get_data(bl);
  161. enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
  162. /* pwm control */
  163. if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
  164. lm3630a_pwm_ctrl(pchip, bl->props.brightness,
  165. bl->props.max_brightness);
  166. return 0;
  167. }
  168. /* disable sleep */
  169. ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
  170. if (ret < 0)
  171. goto out_i2c_err;
  172. usleep_range(1000, 2000);
  173. /* minimum brightness is 0x04 */
  174. ret = lm3630a_write(pchip, REG_BRT_A, bl->props.brightness);
  175. if (bl->props.brightness < 0x4)
  176. ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDA_ENABLE, 0);
  177. else
  178. ret |= lm3630a_update(pchip, REG_CTRL,
  179. LM3630A_LEDA_ENABLE, LM3630A_LEDA_ENABLE);
  180. if (ret < 0)
  181. goto out_i2c_err;
  182. return 0;
  183. out_i2c_err:
  184. dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
  185. return ret;
  186. }
  187. static int lm3630a_bank_a_get_brightness(struct backlight_device *bl)
  188. {
  189. int brightness, rval;
  190. struct lm3630a_chip *pchip = bl_get_data(bl);
  191. enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
  192. if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
  193. rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
  194. if (rval < 0)
  195. goto out_i2c_err;
  196. brightness = (rval & 0x01) << 8;
  197. rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
  198. if (rval < 0)
  199. goto out_i2c_err;
  200. brightness |= rval;
  201. goto out;
  202. }
  203. /* disable sleep */
  204. rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
  205. if (rval < 0)
  206. goto out_i2c_err;
  207. usleep_range(1000, 2000);
  208. rval = lm3630a_read(pchip, REG_BRT_A);
  209. if (rval < 0)
  210. goto out_i2c_err;
  211. brightness = rval;
  212. out:
  213. bl->props.brightness = brightness;
  214. return bl->props.brightness;
  215. out_i2c_err:
  216. dev_err(pchip->dev, "i2c failed to access register\n");
  217. return 0;
  218. }
  219. static const struct backlight_ops lm3630a_bank_a_ops = {
  220. .options = BL_CORE_SUSPENDRESUME,
  221. .update_status = lm3630a_bank_a_update_status,
  222. .get_brightness = lm3630a_bank_a_get_brightness,
  223. };
  224. /* update and get brightness */
  225. static int lm3630a_bank_b_update_status(struct backlight_device *bl)
  226. {
  227. int ret;
  228. struct lm3630a_chip *pchip = bl_get_data(bl);
  229. enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
  230. /* pwm control */
  231. if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
  232. lm3630a_pwm_ctrl(pchip, bl->props.brightness,
  233. bl->props.max_brightness);
  234. return 0;
  235. }
  236. /* disable sleep */
  237. ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
  238. if (ret < 0)
  239. goto out_i2c_err;
  240. usleep_range(1000, 2000);
  241. /* minimum brightness is 0x04 */
  242. ret = lm3630a_write(pchip, REG_BRT_B, bl->props.brightness);
  243. if (bl->props.brightness < 0x4)
  244. ret |= lm3630a_update(pchip, REG_CTRL, LM3630A_LEDB_ENABLE, 0);
  245. else
  246. ret |= lm3630a_update(pchip, REG_CTRL,
  247. LM3630A_LEDB_ENABLE, LM3630A_LEDB_ENABLE);
  248. if (ret < 0)
  249. goto out_i2c_err;
  250. return 0;
  251. out_i2c_err:
  252. dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
  253. return ret;
  254. }
  255. static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
  256. {
  257. int brightness, rval;
  258. struct lm3630a_chip *pchip = bl_get_data(bl);
  259. enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
  260. if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
  261. rval = lm3630a_read(pchip, REG_PWM_OUTHIGH);
  262. if (rval < 0)
  263. goto out_i2c_err;
  264. brightness = (rval & 0x01) << 8;
  265. rval = lm3630a_read(pchip, REG_PWM_OUTLOW);
  266. if (rval < 0)
  267. goto out_i2c_err;
  268. brightness |= rval;
  269. goto out;
  270. }
  271. /* disable sleep */
  272. rval = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
  273. if (rval < 0)
  274. goto out_i2c_err;
  275. usleep_range(1000, 2000);
  276. rval = lm3630a_read(pchip, REG_BRT_B);
  277. if (rval < 0)
  278. goto out_i2c_err;
  279. brightness = rval;
  280. out:
  281. bl->props.brightness = brightness;
  282. return bl->props.brightness;
  283. out_i2c_err:
  284. dev_err(pchip->dev, "i2c failed to access register\n");
  285. return 0;
  286. }
  287. static const struct backlight_ops lm3630a_bank_b_ops = {
  288. .options = BL_CORE_SUSPENDRESUME,
  289. .update_status = lm3630a_bank_b_update_status,
  290. .get_brightness = lm3630a_bank_b_get_brightness,
  291. };
  292. static int lm3630a_backlight_register(struct lm3630a_chip *pchip)
  293. {
  294. struct lm3630a_platform_data *pdata = pchip->pdata;
  295. struct backlight_properties props;
  296. const char *label;
  297. props.type = BACKLIGHT_RAW;
  298. if (pdata->leda_ctrl != LM3630A_LEDA_DISABLE) {
  299. props.brightness = pdata->leda_init_brt;
  300. props.max_brightness = pdata->leda_max_brt;
  301. label = pdata->leda_label ? pdata->leda_label : "lm3630a_leda";
  302. pchip->bleda =
  303. devm_backlight_device_register(pchip->dev, label,
  304. pchip->dev, pchip,
  305. &lm3630a_bank_a_ops, &props);
  306. if (IS_ERR(pchip->bleda))
  307. return PTR_ERR(pchip->bleda);
  308. }
  309. if ((pdata->ledb_ctrl != LM3630A_LEDB_DISABLE) &&
  310. (pdata->ledb_ctrl != LM3630A_LEDB_ON_A)) {
  311. props.brightness = pdata->ledb_init_brt;
  312. props.max_brightness = pdata->ledb_max_brt;
  313. label = pdata->ledb_label ? pdata->ledb_label : "lm3630a_ledb";
  314. pchip->bledb =
  315. devm_backlight_device_register(pchip->dev, label,
  316. pchip->dev, pchip,
  317. &lm3630a_bank_b_ops, &props);
  318. if (IS_ERR(pchip->bledb))
  319. return PTR_ERR(pchip->bledb);
  320. }
  321. return 0;
  322. }
  323. static const struct regmap_config lm3630a_regmap = {
  324. .reg_bits = 8,
  325. .val_bits = 8,
  326. .max_register = REG_MAX,
  327. };
  328. static int lm3630a_parse_led_sources(struct fwnode_handle *node,
  329. int default_led_sources)
  330. {
  331. u32 sources[LM3630A_NUM_SINKS];
  332. int ret, num_sources, i;
  333. num_sources = fwnode_property_count_u32(node, "led-sources");
  334. if (num_sources < 0)
  335. return default_led_sources;
  336. else if (num_sources > ARRAY_SIZE(sources))
  337. return -EINVAL;
  338. ret = fwnode_property_read_u32_array(node, "led-sources", sources,
  339. num_sources);
  340. if (ret)
  341. return ret;
  342. for (i = 0; i < num_sources; i++) {
  343. if (sources[i] != LM3630A_SINK_0 && sources[i] != LM3630A_SINK_1)
  344. return -EINVAL;
  345. ret |= BIT(sources[i]);
  346. }
  347. return ret;
  348. }
  349. static int lm3630a_parse_bank(struct lm3630a_platform_data *pdata,
  350. struct fwnode_handle *node, int *seen_led_sources)
  351. {
  352. int led_sources, ret;
  353. const char *label;
  354. u32 bank, val;
  355. bool linear;
  356. ret = fwnode_property_read_u32(node, "reg", &bank);
  357. if (ret)
  358. return ret;
  359. if (bank != LM3630A_BANK_0 && bank != LM3630A_BANK_1)
  360. return -EINVAL;
  361. led_sources = lm3630a_parse_led_sources(node, BIT(bank));
  362. if (led_sources < 0)
  363. return led_sources;
  364. if (*seen_led_sources & led_sources)
  365. return -EINVAL;
  366. *seen_led_sources |= led_sources;
  367. linear = fwnode_property_read_bool(node,
  368. "ti,linear-mapping-mode");
  369. if (bank) {
  370. if (led_sources & BIT(LM3630A_SINK_0) ||
  371. !(led_sources & BIT(LM3630A_SINK_1)))
  372. return -EINVAL;
  373. pdata->ledb_ctrl = linear ?
  374. LM3630A_LEDB_ENABLE_LINEAR :
  375. LM3630A_LEDB_ENABLE;
  376. } else {
  377. if (!(led_sources & BIT(LM3630A_SINK_0)))
  378. return -EINVAL;
  379. pdata->leda_ctrl = linear ?
  380. LM3630A_LEDA_ENABLE_LINEAR :
  381. LM3630A_LEDA_ENABLE;
  382. if (led_sources & BIT(LM3630A_SINK_1))
  383. pdata->ledb_ctrl = LM3630A_LEDB_ON_A;
  384. }
  385. ret = fwnode_property_read_string(node, "label", &label);
  386. if (!ret) {
  387. if (bank)
  388. pdata->ledb_label = label;
  389. else
  390. pdata->leda_label = label;
  391. }
  392. ret = fwnode_property_read_u32(node, "default-brightness",
  393. &val);
  394. if (!ret) {
  395. if (bank)
  396. pdata->ledb_init_brt = val;
  397. else
  398. pdata->leda_init_brt = val;
  399. }
  400. ret = fwnode_property_read_u32(node, "max-brightness", &val);
  401. if (!ret) {
  402. if (bank)
  403. pdata->ledb_max_brt = val;
  404. else
  405. pdata->leda_max_brt = val;
  406. }
  407. return 0;
  408. }
  409. static int lm3630a_parse_node(struct lm3630a_chip *pchip,
  410. struct lm3630a_platform_data *pdata)
  411. {
  412. int ret = -ENODEV, seen_led_sources = 0;
  413. struct fwnode_handle *node;
  414. device_for_each_child_node(pchip->dev, node) {
  415. ret = lm3630a_parse_bank(pdata, node, &seen_led_sources);
  416. if (ret) {
  417. fwnode_handle_put(node);
  418. return ret;
  419. }
  420. }
  421. return ret;
  422. }
  423. static int lm3630a_probe(struct i2c_client *client,
  424. const struct i2c_device_id *id)
  425. {
  426. struct lm3630a_platform_data *pdata = dev_get_platdata(&client->dev);
  427. struct lm3630a_chip *pchip;
  428. int rval;
  429. if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
  430. dev_err(&client->dev, "fail : i2c functionality check\n");
  431. return -EOPNOTSUPP;
  432. }
  433. pchip = devm_kzalloc(&client->dev, sizeof(struct lm3630a_chip),
  434. GFP_KERNEL);
  435. if (!pchip)
  436. return -ENOMEM;
  437. pchip->dev = &client->dev;
  438. pchip->regmap = devm_regmap_init_i2c(client, &lm3630a_regmap);
  439. if (IS_ERR(pchip->regmap)) {
  440. rval = PTR_ERR(pchip->regmap);
  441. dev_err(&client->dev, "fail : allocate reg. map: %d\n", rval);
  442. return rval;
  443. }
  444. i2c_set_clientdata(client, pchip);
  445. if (pdata == NULL) {
  446. pdata = devm_kzalloc(pchip->dev,
  447. sizeof(struct lm3630a_platform_data),
  448. GFP_KERNEL);
  449. if (pdata == NULL)
  450. return -ENOMEM;
  451. /* default values */
  452. pdata->leda_max_brt = LM3630A_MAX_BRIGHTNESS;
  453. pdata->ledb_max_brt = LM3630A_MAX_BRIGHTNESS;
  454. pdata->leda_init_brt = LM3630A_MAX_BRIGHTNESS;
  455. pdata->ledb_init_brt = LM3630A_MAX_BRIGHTNESS;
  456. rval = lm3630a_parse_node(pchip, pdata);
  457. if (rval) {
  458. dev_err(&client->dev, "fail : parse node\n");
  459. return rval;
  460. }
  461. }
  462. pchip->pdata = pdata;
  463. pchip->enable_gpio = devm_gpiod_get_optional(&client->dev, "enable",
  464. GPIOD_OUT_HIGH);
  465. if (IS_ERR(pchip->enable_gpio)) {
  466. rval = PTR_ERR(pchip->enable_gpio);
  467. return rval;
  468. }
  469. /* chip initialize */
  470. rval = lm3630a_chip_init(pchip);
  471. if (rval < 0) {
  472. dev_err(&client->dev, "fail : init chip\n");
  473. return rval;
  474. }
  475. /* backlight register */
  476. rval = lm3630a_backlight_register(pchip);
  477. if (rval < 0) {
  478. dev_err(&client->dev, "fail : backlight register.\n");
  479. return rval;
  480. }
  481. /* pwm */
  482. if (pdata->pwm_ctrl != LM3630A_PWM_DISABLE) {
  483. pchip->pwmd = devm_pwm_get(pchip->dev, "lm3630a-pwm");
  484. if (IS_ERR(pchip->pwmd)) {
  485. dev_err(&client->dev, "fail : get pwm device\n");
  486. return PTR_ERR(pchip->pwmd);
  487. }
  488. /*
  489. * FIXME: pwm_apply_args() should be removed when switching to
  490. * the atomic PWM API.
  491. */
  492. pwm_apply_args(pchip->pwmd);
  493. }
  494. /* interrupt enable : irq 0 is not allowed */
  495. pchip->irq = client->irq;
  496. if (pchip->irq) {
  497. rval = lm3630a_intr_config(pchip);
  498. if (rval < 0)
  499. return rval;
  500. }
  501. dev_info(&client->dev, "LM3630A backlight register OK.\n");
  502. return 0;
  503. }
  504. static int lm3630a_remove(struct i2c_client *client)
  505. {
  506. int rval;
  507. struct lm3630a_chip *pchip = i2c_get_clientdata(client);
  508. rval = lm3630a_write(pchip, REG_BRT_A, 0);
  509. if (rval < 0)
  510. dev_err(pchip->dev, "i2c failed to access register\n");
  511. rval = lm3630a_write(pchip, REG_BRT_B, 0);
  512. if (rval < 0)
  513. dev_err(pchip->dev, "i2c failed to access register\n");
  514. if (pchip->irq) {
  515. free_irq(pchip->irq, pchip);
  516. flush_workqueue(pchip->irqthread);
  517. destroy_workqueue(pchip->irqthread);
  518. }
  519. return 0;
  520. }
  521. static const struct i2c_device_id lm3630a_id[] = {
  522. {LM3630A_NAME, 0},
  523. {}
  524. };
  525. MODULE_DEVICE_TABLE(i2c, lm3630a_id);
  526. static const struct of_device_id lm3630a_match_table[] = {
  527. { .compatible = "ti,lm3630a", },
  528. { },
  529. };
  530. MODULE_DEVICE_TABLE(of, lm3630a_match_table);
  531. static struct i2c_driver lm3630a_i2c_driver = {
  532. .driver = {
  533. .name = LM3630A_NAME,
  534. .of_match_table = lm3630a_match_table,
  535. },
  536. .probe = lm3630a_probe,
  537. .remove = lm3630a_remove,
  538. .id_table = lm3630a_id,
  539. };
  540. module_i2c_driver(lm3630a_i2c_driver);
  541. MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3630A");
  542. MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
  543. MODULE_AUTHOR("LDD MLP <ldd-mlp@list.ti.com>");
  544. MODULE_LICENSE("GPL v2");