1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright 2015, Heiner Kallweit <hkallweit1@gmail.com>
4 */
5
6#include <net/bluetooth/bluetooth.h>
7#include <net/bluetooth/hci_core.h>
8
9#include "leds.h"
10
11DEFINE_LED_TRIGGER(bt_power_led_trigger);
12
13struct hci_basic_led_trigger {
14	struct led_trigger	led_trigger;
15	struct hci_dev		*hdev;
16};
17
18#define to_hci_basic_led_trigger(arg) container_of(arg, \
19			struct hci_basic_led_trigger, led_trigger)
20
21void hci_leds_update_powered(struct hci_dev *hdev, bool enabled)
22{
23	if (hdev->power_led)
24		led_trigger_event(hdev->power_led,
25				  enabled ? LED_FULL : LED_OFF);
26
27	if (!enabled) {
28		struct hci_dev *d;
29
30		read_lock(&hci_dev_list_lock);
31
32		list_for_each_entry(d, &hci_dev_list, list) {
33			if (test_bit(HCI_UP, &d->flags))
34				enabled = true;
35		}
36
37		read_unlock(&hci_dev_list_lock);
38	}
39
40	led_trigger_event(bt_power_led_trigger, enabled ? LED_FULL : LED_OFF);
41}
42
43static int power_activate(struct led_classdev *led_cdev)
44{
45	struct hci_basic_led_trigger *htrig;
46	bool powered;
47
48	htrig = to_hci_basic_led_trigger(led_cdev->trigger);
49	powered = test_bit(HCI_UP, &htrig->hdev->flags);
50
51	led_trigger_event(led_cdev->trigger, powered ? LED_FULL : LED_OFF);
52
53	return 0;
54}
55
56static struct led_trigger *led_allocate_basic(struct hci_dev *hdev,
57			int (*activate)(struct led_classdev *led_cdev),
58			const char *name)
59{
60	struct hci_basic_led_trigger *htrig;
61
62	htrig =	devm_kzalloc(&hdev->dev, sizeof(*htrig), GFP_KERNEL);
63	if (!htrig)
64		return NULL;
65
66	htrig->hdev = hdev;
67	htrig->led_trigger.activate = activate;
68	htrig->led_trigger.name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
69						 "%s-%s", hdev->name,
70						 name);
71	if (!htrig->led_trigger.name)
72		goto err_alloc;
73
74	if (devm_led_trigger_register(&hdev->dev, &htrig->led_trigger))
75		goto err_register;
76
77	return &htrig->led_trigger;
78
79err_register:
80	devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name);
81err_alloc:
82	devm_kfree(&hdev->dev, htrig);
83	return NULL;
84}
85
86void hci_leds_init(struct hci_dev *hdev)
87{
88	/* initialize power_led */
89	hdev->power_led = led_allocate_basic(hdev, power_activate, "power");
90}
91
92void bt_leds_init(void)
93{
94	led_trigger_register_simple("bluetooth-power", &bt_power_led_trigger);
95}
96
97void bt_leds_cleanup(void)
98{
99	led_trigger_unregister_simple(bt_power_led_trigger);
100}
101