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
11 DEFINE_LED_TRIGGER(bt_power_led_trigger);
12
13 struct 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
21 void 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
43 static 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
56 static 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
79 err_register:
80 devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name);
81 err_alloc:
82 devm_kfree(&hdev->dev, htrig);
83 return NULL;
84 }
85
86 void 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
92 void bt_leds_init(void)
93 {
94 led_trigger_register_simple("bluetooth-power", &bt_power_led_trigger);
95 }
96
97 void bt_leds_cleanup(void)
98 {
99 led_trigger_unregister_simple(bt_power_led_trigger);
100 }
101
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