led-uclass.c 2.0 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. #define LOG_CATEGORY UCLASS_LED
  7. #include <common.h>
  8. #include <dm.h>
  9. #include <errno.h>
  10. #include <led.h>
  11. #include <dm/device-internal.h>
  12. #include <dm/root.h>
  13. #include <dm/uclass-internal.h>
  14. int led_get_by_label(const char *label, struct udevice **devp)
  15. {
  16. struct udevice *dev;
  17. struct uclass *uc;
  18. int ret;
  19. ret = uclass_get(UCLASS_LED, &uc);
  20. if (ret)
  21. return ret;
  22. uclass_foreach_dev(dev, uc) {
  23. struct led_uc_plat *uc_plat = dev_get_uclass_plat(dev);
  24. /* Ignore the top-level LED node */
  25. if (uc_plat->label && !strcmp(label, uc_plat->label))
  26. return uclass_get_device_tail(dev, 0, devp);
  27. }
  28. return -ENODEV;
  29. }
  30. int led_set_state(struct udevice *dev, enum led_state_t state)
  31. {
  32. struct led_ops *ops = led_get_ops(dev);
  33. if (!ops->set_state)
  34. return -ENOSYS;
  35. return ops->set_state(dev, state);
  36. }
  37. enum led_state_t led_get_state(struct udevice *dev)
  38. {
  39. struct led_ops *ops = led_get_ops(dev);
  40. if (!ops->get_state)
  41. return -ENOSYS;
  42. return ops->get_state(dev);
  43. }
  44. #ifdef CONFIG_LED_BLINK
  45. int led_set_period(struct udevice *dev, int period_ms)
  46. {
  47. struct led_ops *ops = led_get_ops(dev);
  48. if (!ops->set_period)
  49. return -ENOSYS;
  50. return ops->set_period(dev, period_ms);
  51. }
  52. #endif
  53. int led_default_state(void)
  54. {
  55. struct udevice *dev;
  56. struct uclass *uc;
  57. const char *default_state;
  58. int ret;
  59. ret = uclass_get(UCLASS_LED, &uc);
  60. if (ret)
  61. return ret;
  62. for (uclass_find_first_device(UCLASS_LED, &dev);
  63. dev;
  64. uclass_find_next_device(&dev)) {
  65. default_state = dev_read_string(dev, "default-state");
  66. if (!default_state)
  67. continue;
  68. ret = device_probe(dev);
  69. if (ret)
  70. return ret;
  71. if (!strncmp(default_state, "on", 2))
  72. led_set_state(dev, LEDST_ON);
  73. else if (!strncmp(default_state, "off", 3))
  74. led_set_state(dev, LEDST_OFF);
  75. /* default-state = "keep" : device is only probed */
  76. }
  77. return ret;
  78. }
  79. UCLASS_DRIVER(led) = {
  80. .id = UCLASS_LED,
  81. .name = "led",
  82. .per_device_plat_auto = sizeof(struct led_uc_plat),
  83. };