leds-mc13783.c 7.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * LEDs driver for Freescale MC13783/MC13892/MC34708
  4. *
  5. * Copyright (C) 2010 Philippe Rétornaz
  6. *
  7. * Based on leds-da903x:
  8. * Copyright (C) 2008 Compulab, Ltd.
  9. * Mike Rapoport <mike@compulab.co.il>
  10. *
  11. * Copyright (C) 2006-2008 Marvell International Ltd.
  12. * Eric Miao <eric.miao@marvell.com>
  13. */
  14. #include <linux/module.h>
  15. #include <linux/kernel.h>
  16. #include <linux/platform_device.h>
  17. #include <linux/leds.h>
  18. #include <linux/of.h>
  19. #include <linux/mfd/mc13xxx.h>
  20. struct mc13xxx_led_devtype {
  21. int led_min;
  22. int led_max;
  23. int num_regs;
  24. u32 ledctrl_base;
  25. };
  26. struct mc13xxx_led {
  27. struct led_classdev cdev;
  28. int id;
  29. struct mc13xxx_leds *leds;
  30. };
  31. struct mc13xxx_leds {
  32. struct mc13xxx *master;
  33. struct mc13xxx_led_devtype *devtype;
  34. int num_leds;
  35. struct mc13xxx_led *led;
  36. };
  37. static unsigned int mc13xxx_max_brightness(int id)
  38. {
  39. if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
  40. return 0x0f;
  41. else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
  42. return 0x1f;
  43. return 0x3f;
  44. }
  45. static int mc13xxx_led_set(struct led_classdev *led_cdev,
  46. enum led_brightness value)
  47. {
  48. struct mc13xxx_led *led =
  49. container_of(led_cdev, struct mc13xxx_led, cdev);
  50. struct mc13xxx_leds *leds = led->leds;
  51. unsigned int reg, bank, off, shift;
  52. switch (led->id) {
  53. case MC13783_LED_MD:
  54. case MC13783_LED_AD:
  55. case MC13783_LED_KP:
  56. reg = 2;
  57. shift = 9 + (led->id - MC13783_LED_MD) * 4;
  58. break;
  59. case MC13783_LED_R1:
  60. case MC13783_LED_G1:
  61. case MC13783_LED_B1:
  62. case MC13783_LED_R2:
  63. case MC13783_LED_G2:
  64. case MC13783_LED_B2:
  65. case MC13783_LED_R3:
  66. case MC13783_LED_G3:
  67. case MC13783_LED_B3:
  68. off = led->id - MC13783_LED_R1;
  69. bank = off / 3;
  70. reg = 3 + bank;
  71. shift = (off - bank * 3) * 5 + 6;
  72. break;
  73. case MC13892_LED_MD:
  74. case MC13892_LED_AD:
  75. case MC13892_LED_KP:
  76. off = led->id - MC13892_LED_MD;
  77. reg = off / 2;
  78. shift = 3 + (off - reg * 2) * 12;
  79. break;
  80. case MC13892_LED_R:
  81. case MC13892_LED_G:
  82. case MC13892_LED_B:
  83. off = led->id - MC13892_LED_R;
  84. bank = off / 2;
  85. reg = 2 + bank;
  86. shift = (off - bank * 2) * 12 + 3;
  87. break;
  88. case MC34708_LED_R:
  89. case MC34708_LED_G:
  90. reg = 0;
  91. shift = 3 + (led->id - MC34708_LED_R) * 12;
  92. break;
  93. default:
  94. BUG();
  95. }
  96. return mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
  97. mc13xxx_max_brightness(led->id) << shift,
  98. value << shift);
  99. }
  100. #ifdef CONFIG_OF
  101. static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
  102. struct platform_device *pdev)
  103. {
  104. struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
  105. struct mc13xxx_leds_platform_data *pdata;
  106. struct device_node *parent, *child;
  107. struct device *dev = &pdev->dev;
  108. int i = 0, ret = -ENODATA;
  109. pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
  110. if (!pdata)
  111. return ERR_PTR(-ENOMEM);
  112. parent = of_get_child_by_name(dev_of_node(dev->parent), "leds");
  113. if (!parent)
  114. goto out_node_put;
  115. ret = of_property_read_u32_array(parent, "led-control",
  116. pdata->led_control,
  117. leds->devtype->num_regs);
  118. if (ret)
  119. goto out_node_put;
  120. pdata->num_leds = of_get_available_child_count(parent);
  121. pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led),
  122. GFP_KERNEL);
  123. if (!pdata->led) {
  124. ret = -ENOMEM;
  125. goto out_node_put;
  126. }
  127. for_each_available_child_of_node(parent, child) {
  128. const char *str;
  129. u32 tmp;
  130. if (of_property_read_u32(child, "reg", &tmp))
  131. continue;
  132. pdata->led[i].id = leds->devtype->led_min + tmp;
  133. if (!of_property_read_string(child, "label", &str))
  134. pdata->led[i].name = str;
  135. if (!of_property_read_string(child, "linux,default-trigger",
  136. &str))
  137. pdata->led[i].default_trigger = str;
  138. i++;
  139. }
  140. pdata->num_leds = i;
  141. ret = i > 0 ? 0 : -ENODATA;
  142. out_node_put:
  143. of_node_put(parent);
  144. return ret ? ERR_PTR(ret) : pdata;
  145. }
  146. #else
  147. static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
  148. struct platform_device *pdev)
  149. {
  150. return ERR_PTR(-ENOSYS);
  151. }
  152. #endif
  153. static int __init mc13xxx_led_probe(struct platform_device *pdev)
  154. {
  155. struct device *dev = &pdev->dev;
  156. struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
  157. struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
  158. struct mc13xxx_led_devtype *devtype =
  159. (struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
  160. struct mc13xxx_leds *leds;
  161. int i, id, ret = -ENODATA;
  162. u32 init_led = 0;
  163. leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
  164. if (!leds)
  165. return -ENOMEM;
  166. leds->devtype = devtype;
  167. leds->master = mcdev;
  168. platform_set_drvdata(pdev, leds);
  169. if (dev_of_node(dev->parent)) {
  170. pdata = mc13xxx_led_probe_dt(pdev);
  171. if (IS_ERR(pdata))
  172. return PTR_ERR(pdata);
  173. } else if (!pdata)
  174. return -ENODATA;
  175. leds->num_leds = pdata->num_leds;
  176. if ((leds->num_leds < 1) ||
  177. (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
  178. dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
  179. return -EINVAL;
  180. }
  181. leds->led = devm_kcalloc(dev, leds->num_leds, sizeof(*leds->led),
  182. GFP_KERNEL);
  183. if (!leds->led)
  184. return -ENOMEM;
  185. for (i = 0; i < devtype->num_regs; i++) {
  186. ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
  187. pdata->led_control[i]);
  188. if (ret)
  189. return ret;
  190. }
  191. for (i = 0; i < leds->num_leds; i++) {
  192. const char *name, *trig;
  193. ret = -EINVAL;
  194. id = pdata->led[i].id;
  195. name = pdata->led[i].name;
  196. trig = pdata->led[i].default_trigger;
  197. if ((id > devtype->led_max) || (id < devtype->led_min)) {
  198. dev_err(dev, "Invalid ID %i\n", id);
  199. break;
  200. }
  201. if (init_led & (1 << id)) {
  202. dev_warn(dev, "LED %i already initialized\n", id);
  203. break;
  204. }
  205. init_led |= 1 << id;
  206. leds->led[i].id = id;
  207. leds->led[i].leds = leds;
  208. leds->led[i].cdev.name = name;
  209. leds->led[i].cdev.default_trigger = trig;
  210. leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
  211. leds->led[i].cdev.brightness_set_blocking = mc13xxx_led_set;
  212. leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
  213. ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
  214. if (ret) {
  215. dev_err(dev, "Failed to register LED %i\n", id);
  216. break;
  217. }
  218. }
  219. if (ret)
  220. while (--i >= 0)
  221. led_classdev_unregister(&leds->led[i].cdev);
  222. return ret;
  223. }
  224. static int mc13xxx_led_remove(struct platform_device *pdev)
  225. {
  226. struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
  227. int i;
  228. for (i = 0; i < leds->num_leds; i++)
  229. led_classdev_unregister(&leds->led[i].cdev);
  230. return 0;
  231. }
  232. static const struct mc13xxx_led_devtype mc13783_led_devtype = {
  233. .led_min = MC13783_LED_MD,
  234. .led_max = MC13783_LED_B3,
  235. .num_regs = 6,
  236. .ledctrl_base = 51,
  237. };
  238. static const struct mc13xxx_led_devtype mc13892_led_devtype = {
  239. .led_min = MC13892_LED_MD,
  240. .led_max = MC13892_LED_B,
  241. .num_regs = 4,
  242. .ledctrl_base = 51,
  243. };
  244. static const struct mc13xxx_led_devtype mc34708_led_devtype = {
  245. .led_min = MC34708_LED_R,
  246. .led_max = MC34708_LED_G,
  247. .num_regs = 1,
  248. .ledctrl_base = 54,
  249. };
  250. static const struct platform_device_id mc13xxx_led_id_table[] = {
  251. { "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
  252. { "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
  253. { "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
  254. { }
  255. };
  256. MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
  257. static struct platform_driver mc13xxx_led_driver = {
  258. .driver = {
  259. .name = "mc13xxx-led",
  260. },
  261. .remove = mc13xxx_led_remove,
  262. .id_table = mc13xxx_led_id_table,
  263. };
  264. module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
  265. MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
  266. MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
  267. MODULE_LICENSE("GPL");