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 } 102