leds-88pm860x.c 5.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * LED driver for Marvell 88PM860x
  4. *
  5. * Copyright (C) 2009 Marvell International Ltd.
  6. * Haojian Zhuang <haojian.zhuang@marvell.com>
  7. */
  8. #include <linux/kernel.h>
  9. #include <linux/of.h>
  10. #include <linux/platform_device.h>
  11. #include <linux/i2c.h>
  12. #include <linux/leds.h>
  13. #include <linux/slab.h>
  14. #include <linux/mfd/88pm860x.h>
  15. #include <linux/module.h>
  16. #define LED_PWM_MASK (0x1F)
  17. #define LED_CURRENT_MASK (0x07 << 5)
  18. #define LED_BLINK_MASK (0x7F)
  19. #define LED_ON_CONTINUOUS (0x0F << 3)
  20. #define LED1_BLINK_EN (1 << 1)
  21. #define LED2_BLINK_EN (1 << 2)
  22. struct pm860x_led {
  23. struct led_classdev cdev;
  24. struct i2c_client *i2c;
  25. struct pm860x_chip *chip;
  26. struct mutex lock;
  27. char name[MFD_NAME_SIZE];
  28. int port;
  29. int iset;
  30. unsigned char brightness;
  31. unsigned char current_brightness;
  32. int reg_control;
  33. int reg_blink;
  34. int blink_mask;
  35. };
  36. static int led_power_set(struct pm860x_chip *chip, int port, int on)
  37. {
  38. int ret = -EINVAL;
  39. switch (port) {
  40. case 0:
  41. case 1:
  42. case 2:
  43. ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
  44. pm8606_osc_disable(chip, RGB1_ENABLE);
  45. break;
  46. case 3:
  47. case 4:
  48. case 5:
  49. ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
  50. pm8606_osc_disable(chip, RGB2_ENABLE);
  51. break;
  52. }
  53. return ret;
  54. }
  55. static int pm860x_led_set(struct led_classdev *cdev,
  56. enum led_brightness value)
  57. {
  58. struct pm860x_led *led = container_of(cdev, struct pm860x_led, cdev);
  59. struct pm860x_chip *chip;
  60. unsigned char buf[3];
  61. int ret;
  62. chip = led->chip;
  63. mutex_lock(&led->lock);
  64. led->brightness = value >> 3;
  65. if ((led->current_brightness == 0) && led->brightness) {
  66. led_power_set(chip, led->port, 1);
  67. if (led->iset) {
  68. pm860x_set_bits(led->i2c, led->reg_control,
  69. LED_CURRENT_MASK, led->iset);
  70. }
  71. pm860x_set_bits(led->i2c, led->reg_blink,
  72. LED_BLINK_MASK, LED_ON_CONTINUOUS);
  73. pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
  74. led->blink_mask);
  75. }
  76. pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
  77. led->brightness);
  78. if (led->brightness == 0) {
  79. pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
  80. ret = buf[0] & LED_PWM_MASK;
  81. ret |= buf[1] & LED_PWM_MASK;
  82. ret |= buf[2] & LED_PWM_MASK;
  83. if (ret == 0) {
  84. /* unset current since no led is lighting */
  85. pm860x_set_bits(led->i2c, led->reg_control,
  86. LED_CURRENT_MASK, 0);
  87. pm860x_set_bits(led->i2c, PM8606_WLED3B,
  88. led->blink_mask, 0);
  89. led_power_set(chip, led->port, 0);
  90. }
  91. }
  92. led->current_brightness = led->brightness;
  93. dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
  94. led->reg_control, led->brightness);
  95. mutex_unlock(&led->lock);
  96. return 0;
  97. }
  98. #ifdef CONFIG_OF
  99. static int pm860x_led_dt_init(struct platform_device *pdev,
  100. struct pm860x_led *data)
  101. {
  102. struct device_node *nproot, *np;
  103. int iset = 0;
  104. if (!dev_of_node(pdev->dev.parent))
  105. return -ENODEV;
  106. nproot = of_get_child_by_name(dev_of_node(pdev->dev.parent), "leds");
  107. if (!nproot) {
  108. dev_err(&pdev->dev, "failed to find leds node\n");
  109. return -ENODEV;
  110. }
  111. for_each_available_child_of_node(nproot, np) {
  112. if (of_node_name_eq(np, data->name)) {
  113. of_property_read_u32(np, "marvell,88pm860x-iset",
  114. &iset);
  115. data->iset = PM8606_LED_CURRENT(iset);
  116. of_node_put(np);
  117. break;
  118. }
  119. }
  120. of_node_put(nproot);
  121. return 0;
  122. }
  123. #else
  124. #define pm860x_led_dt_init(x, y) (-1)
  125. #endif
  126. static int pm860x_led_probe(struct platform_device *pdev)
  127. {
  128. struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
  129. struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
  130. struct pm860x_led *data;
  131. struct resource *res;
  132. int ret = 0;
  133. data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
  134. if (data == NULL)
  135. return -ENOMEM;
  136. res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
  137. if (!res) {
  138. dev_err(&pdev->dev, "No REG resource for control\n");
  139. return -ENXIO;
  140. }
  141. data->reg_control = res->start;
  142. res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
  143. if (!res) {
  144. dev_err(&pdev->dev, "No REG resource for blink\n");
  145. return -ENXIO;
  146. }
  147. data->reg_blink = res->start;
  148. memset(data->name, 0, MFD_NAME_SIZE);
  149. switch (pdev->id) {
  150. case 0:
  151. data->blink_mask = LED1_BLINK_EN;
  152. sprintf(data->name, "led0-red");
  153. break;
  154. case 1:
  155. data->blink_mask = LED1_BLINK_EN;
  156. sprintf(data->name, "led0-green");
  157. break;
  158. case 2:
  159. data->blink_mask = LED1_BLINK_EN;
  160. sprintf(data->name, "led0-blue");
  161. break;
  162. case 3:
  163. data->blink_mask = LED2_BLINK_EN;
  164. sprintf(data->name, "led1-red");
  165. break;
  166. case 4:
  167. data->blink_mask = LED2_BLINK_EN;
  168. sprintf(data->name, "led1-green");
  169. break;
  170. case 5:
  171. data->blink_mask = LED2_BLINK_EN;
  172. sprintf(data->name, "led1-blue");
  173. break;
  174. }
  175. data->chip = chip;
  176. data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
  177. data->port = pdev->id;
  178. if (pm860x_led_dt_init(pdev, data))
  179. if (pdata)
  180. data->iset = pdata->iset;
  181. data->current_brightness = 0;
  182. data->cdev.name = data->name;
  183. data->cdev.brightness_set_blocking = pm860x_led_set;
  184. mutex_init(&data->lock);
  185. ret = led_classdev_register(chip->dev, &data->cdev);
  186. if (ret < 0) {
  187. dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
  188. return ret;
  189. }
  190. pm860x_led_set(&data->cdev, 0);
  191. platform_set_drvdata(pdev, data);
  192. return 0;
  193. }
  194. static int pm860x_led_remove(struct platform_device *pdev)
  195. {
  196. struct pm860x_led *data = platform_get_drvdata(pdev);
  197. led_classdev_unregister(&data->cdev);
  198. return 0;
  199. }
  200. static struct platform_driver pm860x_led_driver = {
  201. .driver = {
  202. .name = "88pm860x-led",
  203. },
  204. .probe = pm860x_led_probe,
  205. .remove = pm860x_led_remove,
  206. };
  207. module_platform_driver(pm860x_led_driver);
  208. MODULE_DESCRIPTION("LED driver for Marvell PM860x");
  209. MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
  210. MODULE_LICENSE("GPL");
  211. MODULE_ALIAS("platform:88pm860x-led");