[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.pdfSigned-off-by: Daniel Jeong <gshark.jeong@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

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

include/media/lm3646.h

+/*
+ * include/media/lm3646.h
+ *
+ * Copyright (C) 2014 Texas Instruments
+ *
+ * Contact: Daniel Jeong <gshark.jeong@gmail.com>
+ *			Ldd-Mlp <ldd-mlp@list.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.
+ */
+
+#ifndef __LM3646_H__
+#define __LM3646_H__
+
+#include <media/v4l2-subdev.h>
+
+#define LM3646_NAME	"lm3646"
+#define LM3646_I2C_ADDR_REV1	(0x67)
+#define LM3646_I2C_ADDR_REV0	(0x63)
+
+/*  TOTAL FLASH Brightness Max
+ *	min 93350uA, step 93750uA, max 1499600uA
+ */
+#define LM3646_TOTAL_FLASH_BRT_MIN 93350
+#define LM3646_TOTAL_FLASH_BRT_STEP 93750
+#define LM3646_TOTAL_FLASH_BRT_MAX 1499600
+#define LM3646_TOTAL_FLASH_BRT_uA_TO_REG(a)	\
+	((a) < LM3646_TOTAL_FLASH_BRT_MIN ? 0 :	\
+	 ((((a) - LM3646_TOTAL_FLASH_BRT_MIN) / LM3646_TOTAL_FLASH_BRT_STEP)))
+
+/*  TOTAL TORCH Brightness Max
+ *	min 23040uA, step 23430uA, max 187100uA
+ */
+#define LM3646_TOTAL_TORCH_BRT_MIN 23040
+#define LM3646_TOTAL_TORCH_BRT_STEP 23430
+#define LM3646_TOTAL_TORCH_BRT_MAX 187100
+#define LM3646_TOTAL_TORCH_BRT_uA_TO_REG(a)	\
+	((a) < LM3646_TOTAL_TORCH_BRT_MIN ? 0 :	\
+	 ((((a) - LM3646_TOTAL_TORCH_BRT_MIN) / LM3646_TOTAL_TORCH_BRT_STEP)))
+
+/*  LED1 FLASH Brightness
+ *	min 23040uA, step 11718uA, max 1499600uA
+ */
+#define LM3646_LED1_FLASH_BRT_MIN 23040
+#define LM3646_LED1_FLASH_BRT_STEP 11718
+#define LM3646_LED1_FLASH_BRT_MAX 1499600
+#define LM3646_LED1_FLASH_BRT_uA_TO_REG(a)	\
+	((a) <= LM3646_LED1_FLASH_BRT_MIN ? 0 :	\
+	 ((((a) - LM3646_LED1_FLASH_BRT_MIN) / LM3646_LED1_FLASH_BRT_STEP))+1)
+
+/*  LED1 TORCH Brightness
+ *	min 2530uA, step 1460uA, max 187100uA
+ */
+#define LM3646_LED1_TORCH_BRT_MIN 2530
+#define LM3646_LED1_TORCH_BRT_STEP 1460
+#define LM3646_LED1_TORCH_BRT_MAX 187100
+#define LM3646_LED1_TORCH_BRT_uA_TO_REG(a)	\
+	((a) <= LM3646_LED1_TORCH_BRT_MIN ? 0 :	\
+	 ((((a) - LM3646_LED1_TORCH_BRT_MIN) / LM3646_LED1_TORCH_BRT_STEP))+1)
+
+/*  FLASH TIMEOUT DURATION
+ *	min 50ms, step 50ms, max 400ms
+ */
+#define LM3646_FLASH_TOUT_MIN 50
+#define LM3646_FLASH_TOUT_STEP 50
+#define LM3646_FLASH_TOUT_MAX 400
+#define LM3646_FLASH_TOUT_ms_TO_REG(a)	\
+	((a) <= LM3646_FLASH_TOUT_MIN ? 0 :	\
+	 (((a) - LM3646_FLASH_TOUT_MIN) / LM3646_FLASH_TOUT_STEP))
+
+/* struct lm3646_platform_data
+ *
+ * @flash_timeout: flash timeout
+ * @led1_flash_brt: led1 flash mode brightness, uA
+ * @led1_torch_brt: led1 torch mode brightness, uA
+ */
+struct lm3646_platform_data {
+
+	u32 flash_timeout;
+
+	u32 led1_flash_brt;
+	u32 led1_torch_brt;
+};
+
+#endif /* __LM3646_H__ */