[media] lm3646: add new dual LED Flash driver

This patch adds the driver for the LM3646, dual LED Flash driver.
The LM3646 has two 1.5A sync. boost converter with dual white current source.
It is controlled via an I2C compatible interface.
Each flash brightness, torch brightness and enable/disable can be controlled.
Under voltage, input voltage monitor and thermal threshhold Faults are added.
Please refer the datasheet http://www.ti.com/lit/ds/snvs962/snvs962.pdf

Signed-off-by: Daniel Jeong <[email protected]>
Signed-off-by: Sakari Ailus <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

Author: geon-jeong

drivers/media/i2c/Kconfig

@@ -629,6 +629,15 @@ config VIDEO_LM3560
 	  This is a driver for the lm3560 dual flash controllers. It controls
 	  flash, torch LEDs.
 
+config VIDEO_LM3646
+	tristate "LM3646 dual flash driver support"
+	depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
+	depends on MEDIA_CAMERA_SUPPORT
+	select REGMAP_I2C
+	---help---
+	  This is a driver for the lm3646 dual flash controllers. It controls
+	  flash, torch LEDs.
+
 comment "Video improvement chips"
 
 config VIDEO_UPD64031A

drivers/media/i2c/Makefile

@@ -72,6 +72,7 @@ obj-$(CONFIG_VIDEO_S5C73M3)	+= s5c73m3/
 obj-$(CONFIG_VIDEO_ADP1653)	+= adp1653.o
 obj-$(CONFIG_VIDEO_AS3645A)	+= as3645a.o
 obj-$(CONFIG_VIDEO_LM3560)	+= lm3560.o
+obj-$(CONFIG_VIDEO_LM3646)	+= lm3646.o
 obj-$(CONFIG_VIDEO_SMIAPP_PLL)	+= smiapp-pll.o
 obj-$(CONFIG_VIDEO_AK881X)		+= ak881x.o
 obj-$(CONFIG_VIDEO_IR_I2C)  += ir-kbd-i2c.o