leds-da9052.c 4.4 KB

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  1. // SPDX-License-Identifier: GPL-2.0-or-later
  2. /*
  3. * LED Driver for Dialog DA9052 PMICs.
  4. *
  5. * Copyright(c) 2012 Dialog Semiconductor Ltd.
  6. *
  7. * Author: David Dajun Chen <dchen@diasemi.com>
  8. */
  9. #include <linux/module.h>
  10. #include <linux/kernel.h>
  11. #include <linux/platform_device.h>
  12. #include <linux/leds.h>
  13. #include <linux/slab.h>
  14. #include <linux/mfd/da9052/reg.h>
  15. #include <linux/mfd/da9052/da9052.h>
  16. #include <linux/mfd/da9052/pdata.h>
  17. #define DA9052_OPENDRAIN_OUTPUT 2
  18. #define DA9052_SET_HIGH_LVL_OUTPUT (1 << 3)
  19. #define DA9052_MASK_UPPER_NIBBLE 0xF0
  20. #define DA9052_MASK_LOWER_NIBBLE 0x0F
  21. #define DA9052_NIBBLE_SHIFT 4
  22. #define DA9052_MAX_BRIGHTNESS 0x5f
  23. struct da9052_led {
  24. struct led_classdev cdev;
  25. struct da9052 *da9052;
  26. unsigned char led_index;
  27. unsigned char id;
  28. };
  29. static unsigned char led_reg[] = {
  30. DA9052_LED_CONT_4_REG,
  31. DA9052_LED_CONT_5_REG,
  32. };
  33. static int da9052_set_led_brightness(struct da9052_led *led,
  34. enum led_brightness brightness)
  35. {
  36. u8 val;
  37. int error;
  38. val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;
  39. error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
  40. if (error < 0)
  41. dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
  42. error);
  43. return error;
  44. }
  45. static int da9052_led_set(struct led_classdev *led_cdev,
  46. enum led_brightness value)
  47. {
  48. struct da9052_led *led =
  49. container_of(led_cdev, struct da9052_led, cdev);
  50. return da9052_set_led_brightness(led, value);
  51. }
  52. static int da9052_configure_leds(struct da9052 *da9052)
  53. {
  54. int error;
  55. unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
  56. | DA9052_SET_HIGH_LVL_OUTPUT;
  57. error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
  58. DA9052_MASK_LOWER_NIBBLE,
  59. register_value);
  60. if (error < 0) {
  61. dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
  62. error);
  63. return error;
  64. }
  65. error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
  66. DA9052_MASK_UPPER_NIBBLE,
  67. register_value << DA9052_NIBBLE_SHIFT);
  68. if (error < 0)
  69. dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
  70. error);
  71. return error;
  72. }
  73. static int da9052_led_probe(struct platform_device *pdev)
  74. {
  75. struct da9052_pdata *pdata;
  76. struct da9052 *da9052;
  77. struct led_platform_data *pled;
  78. struct da9052_led *led = NULL;
  79. int error = -ENODEV;
  80. int i;
  81. da9052 = dev_get_drvdata(pdev->dev.parent);
  82. pdata = dev_get_platdata(da9052->dev);
  83. if (pdata == NULL) {
  84. dev_err(&pdev->dev, "No platform data\n");
  85. goto err;
  86. }
  87. pled = pdata->pled;
  88. if (pled == NULL) {
  89. dev_err(&pdev->dev, "No platform data for LED\n");
  90. goto err;
  91. }
  92. led = devm_kcalloc(&pdev->dev,
  93. pled->num_leds, sizeof(struct da9052_led),
  94. GFP_KERNEL);
  95. if (!led) {
  96. error = -ENOMEM;
  97. goto err;
  98. }
  99. for (i = 0; i < pled->num_leds; i++) {
  100. led[i].cdev.name = pled->leds[i].name;
  101. led[i].cdev.brightness_set_blocking = da9052_led_set;
  102. led[i].cdev.brightness = LED_OFF;
  103. led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
  104. led[i].led_index = pled->leds[i].flags;
  105. led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
  106. error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
  107. if (error) {
  108. dev_err(&pdev->dev, "Failed to register led %d\n",
  109. led[i].led_index);
  110. goto err_register;
  111. }
  112. error = da9052_set_led_brightness(&led[i],
  113. led[i].cdev.brightness);
  114. if (error) {
  115. dev_err(&pdev->dev, "Unable to init led %d\n",
  116. led[i].led_index);
  117. continue;
  118. }
  119. }
  120. error = da9052_configure_leds(led->da9052);
  121. if (error) {
  122. dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
  123. goto err_register;
  124. }
  125. platform_set_drvdata(pdev, led);
  126. return 0;
  127. err_register:
  128. for (i = i - 1; i >= 0; i--)
  129. led_classdev_unregister(&led[i].cdev);
  130. err:
  131. return error;
  132. }
  133. static int da9052_led_remove(struct platform_device *pdev)
  134. {
  135. struct da9052_led *led = platform_get_drvdata(pdev);
  136. struct da9052_pdata *pdata;
  137. struct da9052 *da9052;
  138. struct led_platform_data *pled;
  139. int i;
  140. da9052 = dev_get_drvdata(pdev->dev.parent);
  141. pdata = dev_get_platdata(da9052->dev);
  142. pled = pdata->pled;
  143. for (i = 0; i < pled->num_leds; i++) {
  144. da9052_set_led_brightness(&led[i], LED_OFF);
  145. led_classdev_unregister(&led[i].cdev);
  146. }
  147. return 0;
  148. }
  149. static struct platform_driver da9052_led_driver = {
  150. .driver = {
  151. .name = "da9052-leds",
  152. },
  153. .probe = da9052_led_probe,
  154. .remove = da9052_led_remove,
  155. };
  156. module_platform_driver(da9052_led_driver);
  157. MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
  158. MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
  159. MODULE_LICENSE("GPL");