[media] as3645a: Add driver for LED flash controller

This patch adds the driver for the as3645a LED flash controller. This
controller supports a high power led in flash and torch modes and an
indicator light, sometimes also called privacy light.
Signed-off-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NNayden Kanchev <nkanchev@mm-sol.com>
Signed-off-by: NTuukka Toivonen <tuukkat76@gmail.com>
Signed-off-by: NAntti Koskipaa <antti.koskipaa@gmail.com>
Signed-off-by: NStanimir Varbanov <svarbanov@mm-sol.com>
Signed-off-by: NVimarsh Zutshi <vimarsh.zutshi@gmail.com>
Signed-off-by: NSakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: NIvan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: NMika Westerberg <ext-mika.1.westerberg@nokia.com>
Signed-off-by: NDavid Cohen <dacohen@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/Kconfig

@@ -533,6 +533,13 @@ config VIDEO_ADP1653
 	  This is a driver for the ADP1653 flash controller. It is used for
 	  example in Nokia N900.
 
+config VIDEO_AS3645A
+	tristate "AS3645A flash driver support"
+	depends on I2C && VIDEO_V4L2 && MEDIA_CONTROLLER
+	---help---
+	  This is a driver for the AS3645A and LM3555 flash controllers. It has
+	  build in control for flash, torch and indicator LEDs.
+
 comment "Video improvement chips"
 
 config VIDEO_UPD64031A

drivers/media/video/Makefile

@@ -74,6 +74,7 @@ obj-$(CONFIG_VIDEO_NOON010PC30)	+= noon010pc30.o
 obj-$(CONFIG_VIDEO_M5MOLS)	+= m5mols/
 obj-$(CONFIG_VIDEO_S5K6AA)	+= s5k6aa.o
 obj-$(CONFIG_VIDEO_ADP1653)	+= adp1653.o
+obj-$(CONFIG_VIDEO_AS3645A)	+= as3645a.o
 
 obj-$(CONFIG_SOC_CAMERA_IMX074)		+= imx074.o
 obj-$(CONFIG_SOC_CAMERA_MT9M001)	+= mt9m001.o

include/media/as3645a.h

+/*
+ * include/media/as3645a.h
+ *
+ * Copyright (C) 2008-2011 Nokia Corporation
+ *
+ * Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.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.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#ifndef __AS3645A_H__
+#define __AS3645A_H__
+
+#include <media/v4l2-subdev.h>
+
+#define AS3645A_NAME				"as3645a"
+#define AS3645A_I2C_ADDR			(0x60 >> 1) /* W:0x60, R:0x61 */
+
+#define AS3645A_FLASH_TIMEOUT_MIN		100000	/* us */
+#define AS3645A_FLASH_TIMEOUT_MAX		850000
+#define AS3645A_FLASH_TIMEOUT_STEP		50000
+
+#define AS3645A_FLASH_INTENSITY_MIN		200	/* mA */
+#define AS3645A_FLASH_INTENSITY_MAX_1LED	500
+#define AS3645A_FLASH_INTENSITY_MAX_2LEDS	400
+#define AS3645A_FLASH_INTENSITY_STEP		20
+
+#define AS3645A_TORCH_INTENSITY_MIN		20	/* mA */
+#define AS3645A_TORCH_INTENSITY_MAX		160
+#define AS3645A_TORCH_INTENSITY_STEP		20
+
+#define AS3645A_INDICATOR_INTENSITY_MIN		0	/* uA */
+#define AS3645A_INDICATOR_INTENSITY_MAX		10000
+#define AS3645A_INDICATOR_INTENSITY_STEP	2500
+
+/*
+ * as3645a_platform_data - Flash controller platform data
+ * @set_power:	Set power callback
+ * @vref:	VREF offset (0=0V, 1=+0.3V, 2=-0.3V, 3=+0.6V)
+ * @peak:	Inductor peak current limit (0=1.25A, 1=1.5A, 2=1.75A, 3=2.0A)
+ * @ext_strobe:	True if external flash strobe can be used
+ * @flash_max_current:	Max flash current (mA, <= AS3645A_FLASH_INTENSITY_MAX)
+ * @torch_max_current:	Max torch current (mA, >= AS3645A_TORCH_INTENSITY_MAX)
+ * @timeout_max:	Max flash timeout (us, <= AS3645A_FLASH_TIMEOUT_MAX)
+ */
+struct as3645a_platform_data {
+	int (*set_power)(struct v4l2_subdev *subdev, int on);
+	unsigned int vref;
+	unsigned int peak;
+	bool ext_strobe;
+
+	/* Flash and torch currents and timeout limits */
+	unsigned int flash_max_current;
+	unsigned int torch_max_current;
+	unsigned int timeout_max;
+};
+
+#endif /* __AS3645A_H__ */