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 int 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 return 0; 57 } 58 59 static struct led_trigger *led_allocate_basic(struct hci_dev *hdev, 60 int (*activate)(struct led_classdev *led_cdev), 61 const char *name) 62 { 63 struct hci_basic_led_trigger *htrig; 64 65 htrig = devm_kzalloc(&hdev->dev, sizeof(*htrig), GFP_KERNEL); 66 if (!htrig) 67 return NULL; 68 69 htrig->hdev = hdev; 70 htrig->led_trigger.activate = activate; 71 htrig->led_trigger.name = devm_kasprintf(&hdev->dev, GFP_KERNEL, 72 "%s-%s", hdev->name, 73 name); 74 if (!htrig->led_trigger.name) 75 goto err_alloc; 76 77 if (devm_led_trigger_register(&hdev->dev, &htrig->led_trigger)) 78 goto err_register; 79 80 return &htrig->led_trigger; 81 82 err_register: 83 devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name); 84 err_alloc: 85 devm_kfree(&hdev->dev, htrig); 86 return NULL; 87 } 88 89 void hci_leds_init(struct hci_dev *hdev) 90 { 91 /* initialize power_led */ 92 hdev->power_led = led_allocate_basic(hdev, power_activate, "power"); 93 } 94 95 void bt_leds_init(void) 96 { 97 led_trigger_register_simple("bluetooth-power", &bt_power_led_trigger); 98 } 99 100 void bt_leds_cleanup(void) 101 { 102 led_trigger_unregister_simple(bt_power_led_trigger); 103 } 104