[media] adp1653: Add driver for LED flash controller

This patch adds the driver for the adp1653 LED flash controller. This
controller supports a high power led in flash and torch modes and an
indicator light, sometimes also called privacy light.

The adp1653 is used on the Nokia N900.

Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Tuukka Toivonen <tuukkat76@gmail.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: David Cohen <dacohen@gmail.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 126 insertions, 0 deletions

diff --git a/include/media/adp1653.h b/include/media/adp1653.h
new file mode 100644
index 0000000..50a1af8
--- /dev/null
+++ b/include/media/adp1653.h
@@ -0,0 +1,126 @@
+/*
+ * include/media/adp1653.h
+ *
+ * Copyright (C) 2008--2011 Nokia Corporation
+ *
+ * Contact: Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
+ *
+ * Contributors:
+ *	Sakari Ailus <sakari.ailus@maxwell.research.nokia.com>
+ *	Tuukka Toivonen <tuukkat76@gmail.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 ADP1653_H
+#define ADP1653_H
+
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-subdev.h>
+
+#define ADP1653_NAME				"adp1653"
+#define ADP1653_I2C_ADDR			(0x60 >> 1)
+
+/* Register definitions */
+#define ADP1653_REG_OUT_SEL			0x00
+#define ADP1653_REG_OUT_SEL_HPLED_TORCH_MIN	0x01
+#define ADP1653_REG_OUT_SEL_HPLED_TORCH_MAX	0x0b
+#define ADP1653_REG_OUT_SEL_HPLED_FLASH_MIN	0x0c
+#define ADP1653_REG_OUT_SEL_HPLED_FLASH_MAX	0x1f
+#define ADP1653_REG_OUT_SEL_HPLED_SHIFT		3
+#define ADP1653_REG_OUT_SEL_ILED_MAX		0x07
+#define ADP1653_REG_OUT_SEL_ILED_SHIFT		0
+
+#define ADP1653_REG_CONFIG			0x01
+#define ADP1653_REG_CONFIG_TMR_CFG		(1 << 4)
+#define ADP1653_REG_CONFIG_TMR_SET_MAX		0x0f
+#define ADP1653_REG_CONFIG_TMR_SET_SHIFT	0
+
+#define ADP1653_REG_SW_STROBE			0x02
+#define ADP1653_REG_SW_STROBE_SW_STROBE		(1 << 0)
+
+#define ADP1653_REG_FAULT			0x03
+#define ADP1653_REG_FAULT_FLT_SCP		(1 << 3)
+#define ADP1653_REG_FAULT_FLT_OT		(1 << 2)
+#define ADP1653_REG_FAULT_FLT_TMR		(1 << 1)
+#define ADP1653_REG_FAULT_FLT_OV		(1 << 0)
+
+#define ADP1653_INDICATOR_INTENSITY_MIN		0
+#define ADP1653_INDICATOR_INTENSITY_STEP	2500
+#define ADP1653_INDICATOR_INTENSITY_MAX		\
+	(ADP1653_REG_OUT_SEL_ILED_MAX * ADP1653_INDICATOR_INTENSITY_STEP)
+#define ADP1653_INDICATOR_INTENSITY_uA_TO_REG(a) \
+	((a) / ADP1653_INDICATOR_INTENSITY_STEP)
+#define ADP1653_INDICATOR_INTENSITY_REG_TO_uA(a) \
+	((a) * ADP1653_INDICATOR_INTENSITY_STEP)
+
+#define ADP1653_FLASH_INTENSITY_BASE		35
+#define ADP1653_FLASH_INTENSITY_STEP		15
+#define ADP1653_FLASH_INTENSITY_MIN					\
+	(ADP1653_FLASH_INTENSITY_BASE					\
+	 + ADP1653_REG_OUT_SEL_HPLED_FLASH_MIN * ADP1653_FLASH_INTENSITY_STEP)
+#define ADP1653_FLASH_INTENSITY_MAX			\
+	(ADP1653_FLASH_INTENSITY_MIN +			\
+	 (ADP1653_REG_OUT_SEL_HPLED_FLASH_MAX -		\
+	  ADP1653_REG_OUT_SEL_HPLED_FLASH_MIN + 1) *	\
+	 ADP1653_FLASH_INTENSITY_STEP)
+
+#define ADP1653_FLASH_INTENSITY_mA_TO_REG(a)				\
+	((a) < ADP1653_FLASH_INTENSITY_BASE ? 0 :			\
+	 (((a) - ADP1653_FLASH_INTENSITY_BASE) / ADP1653_FLASH_INTENSITY_STEP))
+#define ADP1653_FLASH_INTENSITY_REG_TO_mA(a)		\
+	((a) * ADP1653_FLASH_INTENSITY_STEP + ADP1653_FLASH_INTENSITY_BASE)
+
+#define ADP1653_TORCH_INTENSITY_MIN					\
+	(ADP1653_FLASH_INTENSITY_BASE					\
+	 + ADP1653_REG_OUT_SEL_HPLED_TORCH_MIN * ADP1653_FLASH_INTENSITY_STEP)
+#define ADP1653_TORCH_INTENSITY_MAX			\
+	(ADP1653_TORCH_INTENSITY_MIN +			\
+	 (ADP1653_REG_OUT_SEL_HPLED_TORCH_MAX -		\
+	  ADP1653_REG_OUT_SEL_HPLED_TORCH_MIN + 1) *	\
+	 ADP1653_FLASH_INTENSITY_STEP)
+
+struct adp1653_platform_data {
+	int (*power)(struct v4l2_subdev *sd, int on);
+
+	u32 max_flash_timeout;		/* flash light timeout in us */
+	u32 max_flash_intensity;	/* led intensity, flash mode */
+	u32 max_torch_intensity;	/* led intensity, torch mode */
+	u32 max_indicator_intensity;	/* indicator led intensity */
+};
+
+#define to_adp1653_flash(sd)	container_of(sd, struct adp1653_flash, subdev)
+
+struct adp1653_flash {
+	struct v4l2_subdev subdev;
+	struct adp1653_platform_data *platform_data;
+
+	struct v4l2_ctrl_handler ctrls;
+	struct v4l2_ctrl *led_mode;
+	struct v4l2_ctrl *flash_timeout;
+	struct v4l2_ctrl *flash_intensity;
+	struct v4l2_ctrl *torch_intensity;
+	struct v4l2_ctrl *indicator_intensity;
+
+	struct mutex power_lock;
+	int power_count;
+	int fault;
+};
+
+#endif /* ADP1653_H */