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>

diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig
index eaa286d..49794b4 100644 (file)
--- 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 554e46e..1abf48d 100644 (file)
--- 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 (file)
index 0000000..9bd73a8
--- /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");

diff --git a/include/linux/leds.h b/include/linux/leds.h
index 2d8c0b4..0287ab2 100644 (file)
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -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.
  */