From 6d5d2ee63cee7025badda3b74ae2ef7ab097acfa Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Fri, 8 Jan 2016 19:28:58 +0100 Subject: Bluetooth: add LED trigger for indicating HCI is powered up Add support for LED triggers to the Bluetooth subsystem and add kernel config symbol BT_LEDS for it. For now one trigger for indicating "HCI is powered up" is supported. Signed-off-by: Heiner Kallweit Signed-off-by: Marcel Holtmann --- net/bluetooth/leds.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 net/bluetooth/leds.c (limited to 'net/bluetooth/leds.c') diff --git a/net/bluetooth/leds.c b/net/bluetooth/leds.c new file mode 100644 index 000000000000..ded7c88eaccc --- /dev/null +++ b/net/bluetooth/leds.c @@ -0,0 +1,80 @@ +/* + * Copyright 2015, Heiner Kallweit + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include +#include + +#include "leds.h" + +struct hci_basic_led_trigger { + struct led_trigger led_trigger; + struct hci_dev *hdev; +}; + +#define to_hci_basic_led_trigger(arg) container_of(arg, \ + struct hci_basic_led_trigger, led_trigger) + +void hci_leds_update_powered(struct hci_dev *hdev, bool enabled) +{ + if (hdev->power_led) + led_trigger_event(hdev->power_led, + enabled ? LED_FULL : LED_OFF); +} + +static void power_activate(struct led_classdev *led_cdev) +{ + struct hci_basic_led_trigger *htrig; + bool powered; + + htrig = to_hci_basic_led_trigger(led_cdev->trigger); + powered = test_bit(HCI_UP, &htrig->hdev->flags); + + led_trigger_event(led_cdev->trigger, powered ? LED_FULL : LED_OFF); +} + +static struct led_trigger *led_allocate_basic(struct hci_dev *hdev, + void (*activate)(struct led_classdev *led_cdev), + const char *name) +{ + struct hci_basic_led_trigger *htrig; + + htrig = devm_kzalloc(&hdev->dev, sizeof(*htrig), GFP_KERNEL); + if (!htrig) + return NULL; + + htrig->hdev = hdev; + htrig->led_trigger.activate = activate; + htrig->led_trigger.name = devm_kasprintf(&hdev->dev, GFP_KERNEL, + "%s-%s", hdev->name, + name); + if (!htrig->led_trigger.name) + goto err_alloc; + + if (led_trigger_register(&htrig->led_trigger)) + goto err_register; + + return &htrig->led_trigger; + +err_register: + devm_kfree(&hdev->dev, (void *)htrig->led_trigger.name); +err_alloc: + devm_kfree(&hdev->dev, htrig); + return NULL; +} + +void hci_leds_init(struct hci_dev *hdev) +{ + /* initialize power_led */ + hdev->power_led = led_allocate_basic(hdev, power_activate, "power"); +} + +void hci_leds_exit(struct hci_dev *hdev) +{ + if (hdev->power_led) + led_trigger_unregister(hdev->power_led); +} -- cgit v1.2.3