Quelle  leds.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2015, Heiner Kallweit <hkallweit1@gmail.com>
 */

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#include "leds.h"

DEFINE_LED_TRIGGER(bt_power_led_trigger);

struct hci_basic_led_trigger {
 struct led_trigger led_trigger;
 struct hci_dev  *hdev;
};

#define to_hci_basic_led_trigger(arg) container_of(arg, \
   struct hci_basic_led_trigger, led_trigger)

void hci_leds_update_powered(struct hci_dev *hdev, bool enabled)
{
 if (hdev->power_led)
  led_trigger_event(hdev->power_led,
      enabled ? LED_FULL : LED_OFF);

 if (!enabled) {
  struct hci_dev *d;

  read_lock(&hci_dev_list_lock);

  list_for_each_entry(d, &hci_dev_list, list) {
   if (test_bit(HCI_UP, &d->flags))
    enabled = true;
  }

  read_unlock(&hci_dev_list_lock);
 }

 led_trigger_event(bt_power_led_trigger, enabled ? LED_FULL : LED_OFF);
}

static int power_activate(struct led_classdev *led_cdev)
{
 struct hci_basic_led_trigger *htrig;
 bool powered;

 htrig = to_hci_basic_led_trigger(led_cdev->trigger);
 powered = test_bit(HCI_UP, &htrig->hdev->flags);

 led_set_brightness(led_cdev, powered ? LED_FULL : LED_OFF);

 return 0;
}

static struct led_trigger *led_allocate_basic(struct hci_dev *hdev,
   int (*activate)(struct led_classdev *led_cdev),
   const char *name)
{
 struct hci_basic_led_trigger *htrig;

 htrig = devm_kzalloc(&hdev->dev, sizeof(*htrig), GFP_KERNEL);
 if (!htrig)
  return NULL;

 htrig->hdev = hdev;
 htrig->led_trigger.activate = activate;
 htrig->led_trigger.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
       "%s-%s", hdev->name,
       name);
 if (!htrig->led_trigger.name)
  goto err_alloc;

 if (devm_led_trigger_register(&hdev->dev, &htrig->led_trigger))
  goto err_register;

 return &htrig->led_trigger;

err_register:
 devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name);
err_alloc:
 devm_kfree(&hdev->dev, htrig);
 return NULL;
}

void hci_leds_init(struct hci_dev *hdev)
{
 /* initialize power_led */
 hdev->power_led = led_allocate_basic(hdev, power_activate, "power");
}

void bt_leds_init(void)
{
 led_trigger_register_simple("bluetooth-power", &bt_power_led_trigger);
}

void bt_leds_cleanup(void)
{
 led_trigger_unregister_simple(bt_power_led_trigger);
}