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Commit 48a1d032 authored by Kim, Milo's avatar Kim, Milo Committed by Bryan Wu
Browse files

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: default avatarMilo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: default avatarBryan Wu <cooloney@gmail.com>
parent 39f7e08a

drivers/leds/trigger/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -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

drivers/leds/trigger/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/leds/trigger/ledtrig-camera.c

0 → 100644
+57 −0
Original line number Diff line number Diff line 
/*

 * 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");

include/linux/leds.h

+8 −0
Original line number Diff line number Diff line
@@ -218,6 +218,14 @@ extern void ledtrig_ide_activity(void); 
static inline void ledtrig_ide_activity(void) {}

#endif



#if defined(CONFIG_LEDS_TRIGGER_CAMERA) || defined(CONFIG_LEDS_TRIGGER_CAMERA_MODULE)

extern void ledtrig_flash_ctrl(bool on);

extern void ledtrig_torch_ctrl(bool on);

#else

static inline void ledtrig_flash_ctrl(bool on) {}

static inline void ledtrig_torch_ctrl(bool on) {}

#endif



/*

 * Generic LED platform data for describing LED names and default triggers.

 */