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_set_brightness(led_cdev, 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