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 void 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
  57 static struct led_trigger *led_allocate_basic(struct hci_dev *hdev,
  58                         void (*activate)(struct led_classdev *led_cdev),
  59                         const char *name)
  60 {
  61         struct hci_basic_led_trigger *htrig;
  62
  63         htrig = devm_kzalloc(&hdev->dev, sizeof(*htrig), GFP_KERNEL);
  64         if (!htrig)
  65                 return NULL;
  66
  67         htrig->hdev = hdev;
  68         htrig->led_trigger.activate = activate;
  69         htrig->led_trigger.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
  70                                                  "%s-%s", hdev->name,
  71                                                  name);
  72         if (!htrig->led_trigger.name)
  73                 goto err_alloc;
  74
  75         if (devm_led_trigger_register(&hdev->dev, &htrig->led_trigger))
  76                 goto err_register;
  77
  78         return &htrig->led_trigger;
  79
  80 err_register:
  81         devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name);
  82 err_alloc:
  83         devm_kfree(&hdev->dev, htrig);
  84         return NULL;
  85 }
  86
  87 void hci_leds_init(struct hci_dev *hdev)
  88 {
  89         /* initialize power_led */
  90         hdev->power_led = led_allocate_basic(hdev, power_activate, "power");
  91 }
  92
  93 void bt_leds_init(void)
  94 {
  95         led_trigger_register_simple("bluetooth-power", &bt_power_led_trigger);
  96 }
  97
  98 void bt_leds_cleanup(void)
  99 {
 100         led_trigger_unregister_simple(bt_power_led_trigger);
 101 }