net/bluetooth/leds.c

   1 /*
   2  * Copyright 2015, Heiner Kallweit <hkallweit1@gmail.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <net/bluetooth/bluetooth.h>
  10 #include <net/bluetooth/hci_core.h>
  11
  12 #include "leds.h"
  13
  14 struct hci_basic_led_trigger {
  15         struct led_trigger      led_trigger;
  16         struct hci_dev          *hdev;
  17 };
  18
  19 #define to_hci_basic_led_trigger(arg) container_of(arg, \
  20                         struct hci_basic_led_trigger, led_trigger)
  21
  22 void hci_leds_update_powered(struct hci_dev *hdev, bool enabled)
  23 {
  24         if (hdev->power_led)
  25                 led_trigger_event(hdev->power_led,
  26                                   enabled ? LED_FULL : LED_OFF);
  27 }
  28
  29 static void power_activate(struct led_classdev *led_cdev)
  30 {
  31         struct hci_basic_led_trigger *htrig;
  32         bool powered;
  33
  34         htrig = to_hci_basic_led_trigger(led_cdev->trigger);
  35         powered = test_bit(HCI_UP, &htrig->hdev->flags);
  36
  37         led_trigger_event(led_cdev->trigger, powered ? LED_FULL : LED_OFF);
  38 }
  39
  40 static struct led_trigger *led_allocate_basic(struct hci_dev *hdev,
  41                         void (*activate)(struct led_classdev *led_cdev),
  42                         const char *name)
  43 {
  44         struct hci_basic_led_trigger *htrig;
  45
  46         htrig = devm_kzalloc(&hdev->dev, sizeof(*htrig), GFP_KERNEL);
  47         if (!htrig)
  48                 return NULL;
  49
  50         htrig->hdev = hdev;
  51         htrig->led_trigger.activate = activate;
  52         htrig->led_trigger.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
  53                                                  "%s-%s", hdev->name,
  54                                                  name);
  55         if (!htrig->led_trigger.name)
  56                 goto err_alloc;
  57
  58         if (devm_led_trigger_register(&hdev->dev, &htrig->led_trigger))
  59                 goto err_register;
  60
  61         return &htrig->led_trigger;
  62
  63 err_register:
  64         devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name);
  65 err_alloc:
  66         devm_kfree(&hdev->dev, htrig);
  67         return NULL;
  68 }
  69
  70 void hci_leds_init(struct hci_dev *hdev)
  71 {
  72         /* initialize power_led */
  73         hdev->power_led = led_allocate_basic(hdev, power_activate, "power");
  74 }