leds-sc27xx-bltc.c 8.9 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. // Copyright (C) 2018 Spreadtrum Communications Inc.
  3. #include <linux/leds.h>
  4. #include <linux/module.h>
  5. #include <linux/of.h>
  6. #include <linux/platform_device.h>
  7. #include <linux/regmap.h>
  8. /* PMIC global control register definition */
  9. #define SC27XX_MODULE_EN0 0xc08
  10. #define SC27XX_CLK_EN0 0xc18
  11. #define SC27XX_RGB_CTRL 0xebc
  12. #define SC27XX_BLTC_EN BIT(9)
  13. #define SC27XX_RTC_EN BIT(7)
  14. #define SC27XX_RGB_PD BIT(0)
  15. /* Breathing light controller register definition */
  16. #define SC27XX_LEDS_CTRL 0x00
  17. #define SC27XX_LEDS_PRESCALE 0x04
  18. #define SC27XX_LEDS_DUTY 0x08
  19. #define SC27XX_LEDS_CURVE0 0x0c
  20. #define SC27XX_LEDS_CURVE1 0x10
  21. #define SC27XX_CTRL_SHIFT 4
  22. #define SC27XX_LED_RUN BIT(0)
  23. #define SC27XX_LED_TYPE BIT(1)
  24. #define SC27XX_DUTY_SHIFT 8
  25. #define SC27XX_DUTY_MASK GENMASK(15, 0)
  26. #define SC27XX_MOD_MASK GENMASK(7, 0)
  27. #define SC27XX_CURVE_SHIFT 8
  28. #define SC27XX_CURVE_L_MASK GENMASK(7, 0)
  29. #define SC27XX_CURVE_H_MASK GENMASK(15, 8)
  30. #define SC27XX_LEDS_OFFSET 0x10
  31. #define SC27XX_LEDS_MAX 3
  32. #define SC27XX_LEDS_PATTERN_CNT 4
  33. /* Stage duration step, in milliseconds */
  34. #define SC27XX_LEDS_STEP 125
  35. /* Minimum and maximum duration, in milliseconds */
  36. #define SC27XX_DELTA_T_MIN SC27XX_LEDS_STEP
  37. #define SC27XX_DELTA_T_MAX (SC27XX_LEDS_STEP * 255)
  38. struct sc27xx_led {
  39. struct fwnode_handle *fwnode;
  40. struct led_classdev ldev;
  41. struct sc27xx_led_priv *priv;
  42. u8 line;
  43. bool active;
  44. };
  45. struct sc27xx_led_priv {
  46. struct sc27xx_led leds[SC27XX_LEDS_MAX];
  47. struct regmap *regmap;
  48. struct mutex lock;
  49. u32 base;
  50. };
  51. #define to_sc27xx_led(ldev) \
  52. container_of(ldev, struct sc27xx_led, ldev)
  53. static int sc27xx_led_init(struct regmap *regmap)
  54. {
  55. int err;
  56. err = regmap_update_bits(regmap, SC27XX_MODULE_EN0, SC27XX_BLTC_EN,
  57. SC27XX_BLTC_EN);
  58. if (err)
  59. return err;
  60. err = regmap_update_bits(regmap, SC27XX_CLK_EN0, SC27XX_RTC_EN,
  61. SC27XX_RTC_EN);
  62. if (err)
  63. return err;
  64. return regmap_update_bits(regmap, SC27XX_RGB_CTRL, SC27XX_RGB_PD, 0);
  65. }
  66. static u32 sc27xx_led_get_offset(struct sc27xx_led *leds)
  67. {
  68. return leds->priv->base + SC27XX_LEDS_OFFSET * leds->line;
  69. }
  70. static int sc27xx_led_enable(struct sc27xx_led *leds, enum led_brightness value)
  71. {
  72. u32 base = sc27xx_led_get_offset(leds);
  73. u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
  74. u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
  75. struct regmap *regmap = leds->priv->regmap;
  76. int err;
  77. err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
  78. SC27XX_DUTY_MASK,
  79. (value << SC27XX_DUTY_SHIFT) |
  80. SC27XX_MOD_MASK);
  81. if (err)
  82. return err;
  83. return regmap_update_bits(regmap, ctrl_base,
  84. (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift,
  85. (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift);
  86. }
  87. static int sc27xx_led_disable(struct sc27xx_led *leds)
  88. {
  89. struct regmap *regmap = leds->priv->regmap;
  90. u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
  91. u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
  92. return regmap_update_bits(regmap, ctrl_base,
  93. (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
  94. }
  95. static int sc27xx_led_set(struct led_classdev *ldev, enum led_brightness value)
  96. {
  97. struct sc27xx_led *leds = to_sc27xx_led(ldev);
  98. int err;
  99. mutex_lock(&leds->priv->lock);
  100. if (value == LED_OFF)
  101. err = sc27xx_led_disable(leds);
  102. else
  103. err = sc27xx_led_enable(leds, value);
  104. mutex_unlock(&leds->priv->lock);
  105. return err;
  106. }
  107. static void sc27xx_led_clamp_align_delta_t(u32 *delta_t)
  108. {
  109. u32 v, offset, t = *delta_t;
  110. v = t + SC27XX_LEDS_STEP / 2;
  111. v = clamp_t(u32, v, SC27XX_DELTA_T_MIN, SC27XX_DELTA_T_MAX);
  112. offset = v - SC27XX_DELTA_T_MIN;
  113. offset = SC27XX_LEDS_STEP * (offset / SC27XX_LEDS_STEP);
  114. *delta_t = SC27XX_DELTA_T_MIN + offset;
  115. }
  116. static int sc27xx_led_pattern_clear(struct led_classdev *ldev)
  117. {
  118. struct sc27xx_led *leds = to_sc27xx_led(ldev);
  119. struct regmap *regmap = leds->priv->regmap;
  120. u32 base = sc27xx_led_get_offset(leds);
  121. u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
  122. u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
  123. int err;
  124. mutex_lock(&leds->priv->lock);
  125. /* Reset the rise, high, fall and low time to zero. */
  126. regmap_write(regmap, base + SC27XX_LEDS_CURVE0, 0);
  127. regmap_write(regmap, base + SC27XX_LEDS_CURVE1, 0);
  128. err = regmap_update_bits(regmap, ctrl_base,
  129. (SC27XX_LED_RUN | SC27XX_LED_TYPE) << ctrl_shift, 0);
  130. ldev->brightness = LED_OFF;
  131. mutex_unlock(&leds->priv->lock);
  132. return err;
  133. }
  134. static int sc27xx_led_pattern_set(struct led_classdev *ldev,
  135. struct led_pattern *pattern,
  136. u32 len, int repeat)
  137. {
  138. struct sc27xx_led *leds = to_sc27xx_led(ldev);
  139. u32 base = sc27xx_led_get_offset(leds);
  140. u32 ctrl_base = leds->priv->base + SC27XX_LEDS_CTRL;
  141. u8 ctrl_shift = SC27XX_CTRL_SHIFT * leds->line;
  142. struct regmap *regmap = leds->priv->regmap;
  143. int err;
  144. /*
  145. * Must contain 4 tuples to configure the rise time, high time, fall
  146. * time and low time to enable the breathing mode.
  147. */
  148. if (len != SC27XX_LEDS_PATTERN_CNT)
  149. return -EINVAL;
  150. mutex_lock(&leds->priv->lock);
  151. sc27xx_led_clamp_align_delta_t(&pattern[0].delta_t);
  152. err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
  153. SC27XX_CURVE_L_MASK,
  154. pattern[0].delta_t / SC27XX_LEDS_STEP);
  155. if (err)
  156. goto out;
  157. sc27xx_led_clamp_align_delta_t(&pattern[1].delta_t);
  158. err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
  159. SC27XX_CURVE_L_MASK,
  160. pattern[1].delta_t / SC27XX_LEDS_STEP);
  161. if (err)
  162. goto out;
  163. sc27xx_led_clamp_align_delta_t(&pattern[2].delta_t);
  164. err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE0,
  165. SC27XX_CURVE_H_MASK,
  166. (pattern[2].delta_t / SC27XX_LEDS_STEP) <<
  167. SC27XX_CURVE_SHIFT);
  168. if (err)
  169. goto out;
  170. sc27xx_led_clamp_align_delta_t(&pattern[3].delta_t);
  171. err = regmap_update_bits(regmap, base + SC27XX_LEDS_CURVE1,
  172. SC27XX_CURVE_H_MASK,
  173. (pattern[3].delta_t / SC27XX_LEDS_STEP) <<
  174. SC27XX_CURVE_SHIFT);
  175. if (err)
  176. goto out;
  177. err = regmap_update_bits(regmap, base + SC27XX_LEDS_DUTY,
  178. SC27XX_DUTY_MASK,
  179. (pattern[1].brightness << SC27XX_DUTY_SHIFT) |
  180. SC27XX_MOD_MASK);
  181. if (err)
  182. goto out;
  183. /* Enable the LED breathing mode */
  184. err = regmap_update_bits(regmap, ctrl_base,
  185. SC27XX_LED_RUN << ctrl_shift,
  186. SC27XX_LED_RUN << ctrl_shift);
  187. if (!err)
  188. ldev->brightness = pattern[1].brightness;
  189. out:
  190. mutex_unlock(&leds->priv->lock);
  191. return err;
  192. }
  193. static int sc27xx_led_register(struct device *dev, struct sc27xx_led_priv *priv)
  194. {
  195. int i, err;
  196. err = sc27xx_led_init(priv->regmap);
  197. if (err)
  198. return err;
  199. for (i = 0; i < SC27XX_LEDS_MAX; i++) {
  200. struct sc27xx_led *led = &priv->leds[i];
  201. struct led_init_data init_data = {};
  202. if (!led->active)
  203. continue;
  204. led->line = i;
  205. led->priv = priv;
  206. led->ldev.brightness_set_blocking = sc27xx_led_set;
  207. led->ldev.pattern_set = sc27xx_led_pattern_set;
  208. led->ldev.pattern_clear = sc27xx_led_pattern_clear;
  209. led->ldev.default_trigger = "pattern";
  210. init_data.fwnode = led->fwnode;
  211. init_data.devicename = "sc27xx";
  212. init_data.default_label = ":";
  213. err = devm_led_classdev_register_ext(dev, &led->ldev,
  214. &init_data);
  215. if (err)
  216. return err;
  217. }
  218. return 0;
  219. }
  220. static int sc27xx_led_probe(struct platform_device *pdev)
  221. {
  222. struct device *dev = &pdev->dev;
  223. struct device_node *np = dev_of_node(dev), *child;
  224. struct sc27xx_led_priv *priv;
  225. u32 base, count, reg;
  226. int err;
  227. count = of_get_available_child_count(np);
  228. if (!count || count > SC27XX_LEDS_MAX)
  229. return -EINVAL;
  230. err = of_property_read_u32(np, "reg", &base);
  231. if (err) {
  232. dev_err(dev, "fail to get reg of property\n");
  233. return err;
  234. }
  235. priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  236. if (!priv)
  237. return -ENOMEM;
  238. platform_set_drvdata(pdev, priv);
  239. mutex_init(&priv->lock);
  240. priv->base = base;
  241. priv->regmap = dev_get_regmap(dev->parent, NULL);
  242. if (!priv->regmap) {
  243. err = -ENODEV;
  244. dev_err(dev, "failed to get regmap: %d\n", err);
  245. return err;
  246. }
  247. for_each_available_child_of_node(np, child) {
  248. err = of_property_read_u32(child, "reg", &reg);
  249. if (err) {
  250. of_node_put(child);
  251. mutex_destroy(&priv->lock);
  252. return err;
  253. }
  254. if (reg >= SC27XX_LEDS_MAX || priv->leds[reg].active) {
  255. of_node_put(child);
  256. mutex_destroy(&priv->lock);
  257. return -EINVAL;
  258. }
  259. priv->leds[reg].fwnode = of_fwnode_handle(child);
  260. priv->leds[reg].active = true;
  261. }
  262. err = sc27xx_led_register(dev, priv);
  263. if (err)
  264. mutex_destroy(&priv->lock);
  265. return err;
  266. }
  267. static int sc27xx_led_remove(struct platform_device *pdev)
  268. {
  269. struct sc27xx_led_priv *priv = platform_get_drvdata(pdev);
  270. mutex_destroy(&priv->lock);
  271. return 0;
  272. }
  273. static const struct of_device_id sc27xx_led_of_match[] = {
  274. { .compatible = "sprd,sc2731-bltc", },
  275. { }
  276. };
  277. MODULE_DEVICE_TABLE(of, sc27xx_led_of_match);
  278. static struct platform_driver sc27xx_led_driver = {
  279. .driver = {
  280. .name = "sprd-bltc",
  281. .of_match_table = sc27xx_led_of_match,
  282. },
  283. .probe = sc27xx_led_probe,
  284. .remove = sc27xx_led_remove,
  285. };
  286. module_platform_driver(sc27xx_led_driver);
  287. MODULE_DESCRIPTION("Spreadtrum SC27xx breathing light controller driver");
  288. MODULE_AUTHOR("Xiaotong Lu <xiaotong.lu@spreadtrum.com>");
  289. MODULE_AUTHOR("Baolin Wang <baolin.wang@linaro.org>");
  290. MODULE_LICENSE("GPL v2");