diff options
| author | Kim, Milo <Milo.Kim@ti.com> | 2013-03-14 04:29:24 -0700 |
|---|---|---|
| committer | Bryan Wu <cooloney@gmail.com> | 2013-04-01 11:04:50 -0700 |
| commit | 48a1d032c954b9b06c3adbf35ef4735dd70ab757 (patch) | |
| tree | 1565df19ce741f9332e0a53cc9ef4881a389c002 /drivers/leds | |
| parent | 39f7e08af3fd9ca1cb94a8270354afb2ea5cfcd3 (diff) | |
leds: add camera LED triggers
Some LED devices support flash/torch functionality through the LED subsystem.
This patch enables direct LED trigger controls by the driver.
Flash on/off and torch on/off can be done simply by other driver space.
Two trigger APIs are added, ledtrig_flash_ctrl() and ledtrig_torch_ctrl().
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds')
| -rw-r--r-- | drivers/leds/trigger/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/leds/trigger/Makefile | 1 | ||||
| -rw-r--r-- | drivers/leds/trigger/ledtrig-camera.c | 57 |
3 files changed, 66 insertions, 0 deletions
diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig index eaa286dc494..49794b47b51 100644 --- a/drivers/leds/trigger/Kconfig +++ b/drivers/leds/trigger/Kconfig @@ -100,4 +100,12 @@ config LEDS_TRIGGER_TRANSIENT GPIO/PWM based hardware. If unsure, say Y. +config LEDS_TRIGGER_CAMERA + tristate "LED Camera Flash/Torch Trigger" + depends on LEDS_TRIGGERS + help + This allows LEDs to be controlled as a camera flash/torch device. + This enables direct flash/torch on/off by the driver, kernel space. + If unsure, say Y. + endif # LEDS_TRIGGERS diff --git a/drivers/leds/trigger/Makefile b/drivers/leds/trigger/Makefile index 554e46ee4c2..1abf48dacf7 100644 --- a/drivers/leds/trigger/Makefile +++ b/drivers/leds/trigger/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_LEDS_TRIGGER_GPIO) += ledtrig-gpio.o obj-$(CONFIG_LEDS_TRIGGER_CPU) += ledtrig-cpu.o obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) += ledtrig-default-on.o obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT) += ledtrig-transient.o +obj-$(CONFIG_LEDS_TRIGGER_CAMERA) += ledtrig-camera.o diff --git a/drivers/leds/trigger/ledtrig-camera.c b/drivers/leds/trigger/ledtrig-camera.c new file mode 100644 index 00000000000..9bd73a8bad5 --- /dev/null +++ b/drivers/leds/trigger/ledtrig-camera.c @@ -0,0 +1,57 @@ +/* + * Camera Flash and Torch On/Off Trigger + * + * based on ledtrig-ide-disk.c + * + * Copyright 2013 Texas Instruments + * + * Author: Milo(Woogyom) Kim <milo.kim@ti.com> + * + * 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 <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/leds.h> + +DEFINE_LED_TRIGGER(ledtrig_flash); +DEFINE_LED_TRIGGER(ledtrig_torch); + +void ledtrig_flash_ctrl(bool on) +{ + enum led_brightness brt = on ? LED_FULL : LED_OFF; + + led_trigger_event(ledtrig_flash, brt); +} +EXPORT_SYMBOL_GPL(ledtrig_flash_ctrl); + +void ledtrig_torch_ctrl(bool on) +{ + enum led_brightness brt = on ? LED_FULL : LED_OFF; + + led_trigger_event(ledtrig_torch, brt); +} +EXPORT_SYMBOL_GPL(ledtrig_torch_ctrl); + +static int __init ledtrig_camera_init(void) +{ + led_trigger_register_simple("flash", &ledtrig_flash); + led_trigger_register_simple("torch", &ledtrig_torch); + return 0; +} +module_init(ledtrig_camera_init); + +static void __exit ledtrig_camera_exit(void) +{ + led_trigger_unregister_simple(ledtrig_torch); + led_trigger_unregister_simple(ledtrig_flash); +} +module_exit(ledtrig_camera_exit); + +MODULE_DESCRIPTION("LED Trigger for Camera Flash/Torch Control"); +MODULE_AUTHOR("Milo Kim"); +MODULE_LICENSE("GPL"); |