leds.c 2.2 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Copyright 2015, Heiner Kallweit <hkallweit1@gmail.com>
  4. */
  5. #include <net/bluetooth/bluetooth.h>
  6. #include <net/bluetooth/hci_core.h>
  7. #include "leds.h"
  8. DEFINE_LED_TRIGGER(bt_power_led_trigger);
  9. struct hci_basic_led_trigger {
  10. struct led_trigger led_trigger;
  11. struct hci_dev *hdev;
  12. };
  13. #define to_hci_basic_led_trigger(arg) container_of(arg, \
  14. struct hci_basic_led_trigger, led_trigger)
  15. void hci_leds_update_powered(struct hci_dev *hdev, bool enabled)
  16. {
  17. if (hdev->power_led)
  18. led_trigger_event(hdev->power_led,
  19. enabled ? LED_FULL : LED_OFF);
  20. if (!enabled) {
  21. struct hci_dev *d;
  22. read_lock(&hci_dev_list_lock);
  23. list_for_each_entry(d, &hci_dev_list, list) {
  24. if (test_bit(HCI_UP, &d->flags))
  25. enabled = true;
  26. }
  27. read_unlock(&hci_dev_list_lock);
  28. }
  29. led_trigger_event(bt_power_led_trigger, enabled ? LED_FULL : LED_OFF);
  30. }
  31. static int power_activate(struct led_classdev *led_cdev)
  32. {
  33. struct hci_basic_led_trigger *htrig;
  34. bool powered;
  35. htrig = to_hci_basic_led_trigger(led_cdev->trigger);
  36. powered = test_bit(HCI_UP, &htrig->hdev->flags);
  37. led_trigger_event(led_cdev->trigger, powered ? LED_FULL : LED_OFF);
  38. return 0;
  39. }
  40. static struct led_trigger *led_allocate_basic(struct hci_dev *hdev,
  41. int (*activate)(struct led_classdev *led_cdev),
  42. const char *name)
  43. {
  44. struct hci_basic_led_trigger *htrig;
  45. htrig = devm_kzalloc(&hdev->dev, sizeof(*htrig), GFP_KERNEL);
  46. if (!htrig)
  47. return NULL;
  48. htrig->hdev = hdev;
  49. htrig->led_trigger.activate = activate;
  50. htrig->led_trigger.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
  51. "%s-%s", hdev->name,
  52. name);
  53. if (!htrig->led_trigger.name)
  54. goto err_alloc;
  55. if (devm_led_trigger_register(&hdev->dev, &htrig->led_trigger))
  56. goto err_register;
  57. return &htrig->led_trigger;
  58. err_register:
  59. devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name);
  60. err_alloc:
  61. devm_kfree(&hdev->dev, htrig);
  62. return NULL;
  63. }
  64. void hci_leds_init(struct hci_dev *hdev)
  65. {
  66. /* initialize power_led */
  67. hdev->power_led = led_allocate_basic(hdev, power_activate, "power");
  68. }
  69. void bt_leds_init(void)
  70. {
  71. led_trigger_register_simple("bluetooth-power", &bt_power_led_trigger);
  72. }
  73. void bt_leds_cleanup(void)
  74. {
  75. led_trigger_unregister_simple(bt_power_led_trigger);
  76. }