led_gpio.c 2.6 KB

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  1. // SPDX-License-Identifier: GPL-2.0+
  2. /*
  3. * Copyright (c) 2015 Google, Inc
  4. * Written by Simon Glass <sjg@chromium.org>
  5. */
  6. #include <common.h>
  7. #include <dm.h>
  8. #include <errno.h>
  9. #include <led.h>
  10. #include <log.h>
  11. #include <malloc.h>
  12. #include <asm/gpio.h>
  13. #include <dm/lists.h>
  14. struct led_gpio_priv {
  15. struct gpio_desc gpio;
  16. };
  17. static int gpio_led_set_state(struct udevice *dev, enum led_state_t state)
  18. {
  19. struct led_gpio_priv *priv = dev_get_priv(dev);
  20. int ret;
  21. if (!dm_gpio_is_valid(&priv->gpio))
  22. return -EREMOTEIO;
  23. switch (state) {
  24. case LEDST_OFF:
  25. case LEDST_ON:
  26. break;
  27. case LEDST_TOGGLE:
  28. ret = dm_gpio_get_value(&priv->gpio);
  29. if (ret < 0)
  30. return ret;
  31. state = !ret;
  32. break;
  33. default:
  34. return -ENOSYS;
  35. }
  36. return dm_gpio_set_value(&priv->gpio, state);
  37. }
  38. static enum led_state_t gpio_led_get_state(struct udevice *dev)
  39. {
  40. struct led_gpio_priv *priv = dev_get_priv(dev);
  41. int ret;
  42. if (!dm_gpio_is_valid(&priv->gpio))
  43. return -EREMOTEIO;
  44. ret = dm_gpio_get_value(&priv->gpio);
  45. if (ret < 0)
  46. return ret;
  47. return ret ? LEDST_ON : LEDST_OFF;
  48. }
  49. static int led_gpio_probe(struct udevice *dev)
  50. {
  51. struct led_uc_plat *uc_plat = dev_get_uclass_platdata(dev);
  52. struct led_gpio_priv *priv = dev_get_priv(dev);
  53. int ret;
  54. /* Ignore the top-level LED node */
  55. if (!uc_plat->label)
  56. return 0;
  57. ret = gpio_request_by_name(dev, "gpios", 0, &priv->gpio, GPIOD_IS_OUT);
  58. if (ret)
  59. return ret;
  60. return 0;
  61. }
  62. static int led_gpio_remove(struct udevice *dev)
  63. {
  64. /*
  65. * The GPIO driver may have already been removed. We will need to
  66. * address this more generally.
  67. */
  68. #ifndef CONFIG_SANDBOX
  69. struct led_gpio_priv *priv = dev_get_priv(dev);
  70. if (dm_gpio_is_valid(&priv->gpio))
  71. dm_gpio_free(dev, &priv->gpio);
  72. #endif
  73. return 0;
  74. }
  75. static int led_gpio_bind(struct udevice *parent)
  76. {
  77. struct udevice *dev;
  78. ofnode node;
  79. int ret;
  80. dev_for_each_subnode(node, parent) {
  81. struct led_uc_plat *uc_plat;
  82. const char *label;
  83. label = ofnode_read_string(node, "label");
  84. if (!label)
  85. label = ofnode_get_name(node);
  86. ret = device_bind_driver_to_node(parent, "gpio_led",
  87. ofnode_get_name(node),
  88. node, &dev);
  89. if (ret)
  90. return ret;
  91. uc_plat = dev_get_uclass_platdata(dev);
  92. uc_plat->label = label;
  93. }
  94. return 0;
  95. }
  96. static const struct led_ops gpio_led_ops = {
  97. .set_state = gpio_led_set_state,
  98. .get_state = gpio_led_get_state,
  99. };
  100. static const struct udevice_id led_gpio_ids[] = {
  101. { .compatible = "gpio-leds" },
  102. { }
  103. };
  104. U_BOOT_DRIVER(led_gpio) = {
  105. .name = "gpio_led",
  106. .id = UCLASS_LED,
  107. .of_match = led_gpio_ids,
  108. .ops = &gpio_led_ops,
  109. .priv_auto_alloc_size = sizeof(struct led_gpio_priv),
  110. .bind = led_gpio_bind,
  111. .probe = led_gpio_probe,
  112. .remove = led_gpio_remove,
  113. };