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 DEFINE_LED_TRIGGER(bt_power_led_trigger);
  15
  16 struct hci_basic_led_trigger {
  17         struct led_trigger      led_trigger;
  18         struct hci_dev          *hdev;
  19 };
  20
  21 #define to_hci_basic_led_trigger(arg) container_of(arg, \
  22                         struct hci_basic_led_trigger, led_trigger)
  23
  24 void hci_leds_update_powered(struct hci_dev *hdev, bool enabled)
  25 {
  26         if (hdev->power_led)
  27                 led_trigger_event(hdev->power_led,
  28                                   enabled ? LED_FULL : LED_OFF);
  29
  30         if (!enabled) {
  31                 struct hci_dev *d;
  32
  33                 read_lock(&hci_dev_list_lock);
  34
  35                 list_for_each_entry(d, &hci_dev_list, list) {
  36                         if (test_bit(HCI_UP, &d->flags))
  37                                 enabled = true;
  38                 }
  39
  40                 read_unlock(&hci_dev_list_lock);
  41         }
  42
  43         led_trigger_event(bt_power_led_trigger, enabled ? LED_FULL : LED_OFF);
  44 }
  45
  46 static int power_activate(struct led_classdev *led_cdev)
  47 {
  48         struct hci_basic_led_trigger *htrig;
  49         bool powered;
  50
  51         htrig = to_hci_basic_led_trigger(led_cdev->trigger);
  52         powered = test_bit(HCI_UP, &htrig->hdev->flags);
  53
  54         led_trigger_event(led_cdev->trigger, powered ? LED_FULL : LED_OFF);
  55
  56         return 0;
  57 }
  58
  59 static struct led_trigger *led_allocate_basic(struct hci_dev *hdev,
  60                         int (*activate)(struct led_classdev *led_cdev),
  61                         const char *name)
  62 {
  63         struct hci_basic_led_trigger *htrig;
  64
  65         htrig = devm_kzalloc(&hdev->dev, sizeof(*htrig), GFP_KERNEL);
  66         if (!htrig)
  67                 return NULL;
  68
  69         htrig->hdev = hdev;
  70         htrig->led_trigger.activate = activate;
  71         htrig->led_trigger.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
  72                                                  "%s-%s", hdev->name,
  73                                                  name);
  74         if (!htrig->led_trigger.name)
  75                 goto err_alloc;
  76
  77         if (devm_led_trigger_register(&hdev->dev, &htrig->led_trigger))
  78                 goto err_register;
  79
  80         return &htrig->led_trigger;
  81
  82 err_register:
  83         devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name);
  84 err_alloc:
  85         devm_kfree(&hdev->dev, htrig);
  86         return NULL;
  87 }
  88
  89 void hci_leds_init(struct hci_dev *hdev)
  90 {
  91         /* initialize power_led */
  92         hdev->power_led = led_allocate_basic(hdev, power_activate, "power");
  93 }
  94
  95 void bt_leds_init(void)
  96 {
  97         led_trigger_register_simple("bluetooth-power", &bt_power_led_trigger);
  98 }
  99
 100 void bt_leds_cleanup(void)
 101 {
 102         led_trigger_unregister_simple(bt_power_led_trigger);
 103 }