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[PATCH v3 05/10] v4l: Add support for ov5640 sensor



This adds a very limited driver for ov5640, which
only supports:
 - 2592x1944 @ ~7.5 fps
 - 1920x1080 @ ~15 fps,
 - 1280x720 @ ~24 fps,
 - 640x480 @ ~24 fps,
 - 320x240 @ ~24 fps,

All in YUV422i format, using 1 CSI2 datalane @ 333 MHz.

Signed-off-by: Sergio Aguirre <saaguirre@xxxxxx>
---
 drivers/media/video/Kconfig  |    6 +
 drivers/media/video/Makefile |    1 +
 drivers/media/video/ov5640.c |  948 ++++++++++++++++++++++++++++++++++++++++++
 include/media/ov5640.h       |   10 +
 4 files changed, 965 insertions(+), 0 deletions(-)
 create mode 100644 drivers/media/video/ov5640.c
 create mode 100644 include/media/ov5640.h

diff --git a/drivers/media/video/Kconfig b/drivers/media/video/Kconfig
index 4482ac4..cc76652 100644
--- a/drivers/media/video/Kconfig
+++ b/drivers/media/video/Kconfig
@@ -480,6 +480,12 @@ config VIDEO_OV7670
 	  OV7670 VGA camera.  It currently only works with the M88ALP01
 	  controller.
 
+config VIDEO_OV5640
+	tristate "OmniVision OV5640 sensor support"
+	depends on I2C && VIDEO_V4L2
+	help
+	  This is a ov5640 camera driver
+
 config VIDEO_VS6624
 	tristate "ST VS6624 sensor support"
 	depends on VIDEO_V4L2 && I2C
diff --git a/drivers/media/video/Makefile b/drivers/media/video/Makefile
index c95cc0d..da40ab3 100644
--- a/drivers/media/video/Makefile
+++ b/drivers/media/video/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_VIDEO_CX25840) += cx25840/
 obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
 obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
 obj-$(CONFIG_VIDEO_OV7670) 	+= ov7670.o
+obj-$(CONFIG_VIDEO_OV5640)	+= ov5640.o
 obj-$(CONFIG_VIDEO_TCM825X) += tcm825x.o
 obj-$(CONFIG_VIDEO_TVEEPROM) += tveeprom.o
 obj-$(CONFIG_VIDEO_MT9M032) += mt9m032.o
diff --git a/drivers/media/video/ov5640.c b/drivers/media/video/ov5640.c
new file mode 100644
index 0000000..2a64d50
--- /dev/null
+++ b/drivers/media/video/ov5640.c
@@ -0,0 +1,948 @@
+/*
+ * OmniVision OV5640 sensor driver
+ *
+ * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/videodev2.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/log2.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+
+#include <media/v4l2-device.h>
+#include <media/v4l2-subdev.h>
+#include <media/v4l2-ctrls.h>
+
+#include <media/ov5640.h>
+
+/* OV5640 has only one fixed colorspace per pixelcode */
+struct ov5640_datafmt {
+	enum v4l2_mbus_pixelcode	code;
+	enum v4l2_colorspace		colorspace;
+};
+
+struct ov5640_timing_cfg {
+	u16 x_addr_start;
+	u16 y_addr_start;
+	u16 x_addr_end;
+	u16 y_addr_end;
+	u16 h_output_size;
+	u16 v_output_size;
+	u16 h_total_size;
+	u16 v_total_size;
+	u16 isp_h_offset;
+	u16 isp_v_offset;
+	u8 h_odd_ss_inc;
+	u8 h_even_ss_inc;
+	u8 v_odd_ss_inc;
+	u8 v_even_ss_inc;
+};
+
+enum ov5640_size {
+	OV5640_SIZE_QVGA,
+	OV5640_SIZE_VGA,
+	OV5640_SIZE_720P,
+	OV5640_SIZE_1080P,
+	OV5640_SIZE_5MP,
+	OV5640_SIZE_LAST,
+};
+
+static const struct v4l2_frmsize_discrete ov5640_frmsizes[OV5640_SIZE_LAST] = {
+	{  320,  240 },
+	{  640,  480 },
+	{ 1280,  720 },
+	{ 1920, 1080 },
+	{ 2592, 1944 },
+};
+
+/* Find a frame size in an array */
+static int ov5640_find_framesize(u32 width, u32 height)
+{
+	int i;
+
+	for (i = 0; i < OV5640_SIZE_LAST; i++) {
+		if ((ov5640_frmsizes[i].width >= width) &&
+		    (ov5640_frmsizes[i].height >= height))
+			break;
+	}
+
+	/* If not found, select biggest */
+	if (i >= OV5640_SIZE_LAST)
+		i = OV5640_SIZE_LAST - 1;
+
+	return i;
+}
+
+struct ov5640 {
+	struct v4l2_subdev subdev;
+	struct media_pad pad;
+	struct v4l2_mbus_framefmt format;
+
+	struct v4l2_ctrl_handler ctrl_handler;
+
+	const struct ov5640_platform_data *pdata;
+
+	struct v4l2_ctrl *pixel_rate;
+};
+
+static inline struct ov5640 *to_ov5640(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct ov5640, subdev);
+}
+
+/**
+ * struct ov5640_reg - ov5640 register format
+ * @reg: 16-bit offset to register
+ * @val: 8/16/32-bit register value
+ * @length: length of the register
+ *
+ * Define a structure for OV5640 register initialization values
+ */
+struct ov5640_reg {
+	u16	reg;
+	u8	val;
+};
+
+/* TODO: Divide this properly */
+static const struct ov5640_reg configscript_common1[] = {
+	{ 0x3103, 0x03 },
+	{ 0x3017, 0x00 },
+	{ 0x3018, 0x00 },
+	{ 0x3630, 0x2e },
+	{ 0x3632, 0xe2 },
+	{ 0x3633, 0x23 },
+	{ 0x3634, 0x44 },
+	{ 0x3621, 0xe0 },
+	{ 0x3704, 0xa0 },
+	{ 0x3703, 0x5a },
+	{ 0x3715, 0x78 },
+	{ 0x3717, 0x01 },
+	{ 0x370b, 0x60 },
+	{ 0x3705, 0x1a },
+	{ 0x3905, 0x02 },
+	{ 0x3906, 0x10 },
+	{ 0x3901, 0x0a },
+	{ 0x3731, 0x12 },
+	{ 0x3600, 0x04 },
+	{ 0x3601, 0x22 },
+	{ 0x471c, 0x50 },
+	{ 0x3002, 0x1c },
+	{ 0x3006, 0xc3 },
+	{ 0x300e, 0x05 },
+	{ 0x302e, 0x08 },
+	{ 0x3612, 0x4b },
+	{ 0x3618, 0x04 },
+	{ 0x3034, 0x18 },
+	{ 0x3035, 0x11 },
+	{ 0x3036, 0x54 },
+	{ 0x3037, 0x13 },
+	{ 0x3708, 0x21 },
+	{ 0x3709, 0x12 },
+	{ 0x370c, 0x00 },
+};
+
+/* TODO: Divide this properly */
+static const struct ov5640_reg configscript_common2[] = {
+	{ 0x3a02, 0x01 },
+	{ 0x3a03, 0xec },
+	{ 0x3a08, 0x01 },
+	{ 0x3a09, 0x27 },
+	{ 0x3a0a, 0x00 },
+	{ 0x3a0b, 0xf6 },
+	{ 0x3a0e, 0x06 },
+	{ 0x3a0d, 0x08 },
+	{ 0x3a14, 0x01 },
+	{ 0x3a15, 0xec },
+	{ 0x4001, 0x02 },
+	{ 0x4004, 0x06 },
+	{ 0x460b, 0x37 },
+	{ 0x4750, 0x00 },
+	{ 0x4751, 0x00 },
+	{ 0x4800, 0x24 },
+	{ 0x5a00, 0x08 },
+	{ 0x5a21, 0x00 },
+	{ 0x5a24, 0x00 },
+	{ 0x5000, 0x27 },
+	{ 0x5001, 0x87 },
+	{ 0x3820, 0x40 },
+	{ 0x3821, 0x06 },
+	{ 0x3824, 0x01 },
+	{ 0x5481, 0x08 },
+	{ 0x5482, 0x14 },
+	{ 0x5483, 0x28 },
+	{ 0x5484, 0x51 },
+	{ 0x5485, 0x65 },
+	{ 0x5486, 0x71 },
+	{ 0x5487, 0x7d },
+	{ 0x5488, 0x87 },
+	{ 0x5489, 0x91 },
+	{ 0x548a, 0x9a },
+	{ 0x548b, 0xaa },
+	{ 0x548c, 0xb8 },
+	{ 0x548d, 0xcd },
+	{ 0x548e, 0xdd },
+	{ 0x548f, 0xea },
+	{ 0x5490, 0x1d },
+	{ 0x5381, 0x20 },
+	{ 0x5382, 0x64 },
+	{ 0x5383, 0x08 },
+	{ 0x5384, 0x20 },
+	{ 0x5385, 0x80 },
+	{ 0x5386, 0xa0 },
+	{ 0x5387, 0xa2 },
+	{ 0x5388, 0xa0 },
+	{ 0x5389, 0x02 },
+	{ 0x538a, 0x01 },
+	{ 0x538b, 0x98 },
+	{ 0x5300, 0x08 },
+	{ 0x5301, 0x30 },
+	{ 0x5302, 0x10 },
+	{ 0x5303, 0x00 },
+	{ 0x5304, 0x08 },
+	{ 0x5305, 0x30 },
+	{ 0x5306, 0x08 },
+	{ 0x5307, 0x16 },
+	{ 0x5580, 0x00 },
+	{ 0x5587, 0x00 },
+	{ 0x5588, 0x00 },
+	{ 0x5583, 0x40 },
+	{ 0x5584, 0x10 },
+	{ 0x5589, 0x10 },
+	{ 0x558a, 0x00 },
+	{ 0x558b, 0xf8 },
+	{ 0x3a0f, 0x36 },
+	{ 0x3a10, 0x2e },
+	{ 0x3a1b, 0x38 },
+	{ 0x3a1e, 0x2c },
+	{ 0x3a11, 0x70 },
+	{ 0x3a1f, 0x18 },
+	{ 0x3a18, 0x00 },
+	{ 0x3a19, 0xf8 },
+	{ 0x3003, 0x03 },
+	{ 0x3003, 0x01 },
+};
+
+static const struct ov5640_timing_cfg timing_cfg[OV5640_SIZE_LAST] = {
+	[OV5640_SIZE_QVGA] = {
+		.x_addr_start = 0,
+		.y_addr_start = 0,
+		.x_addr_end = 2623,
+		.y_addr_end = 1951,
+		.h_output_size = 320,
+		.v_output_size = 240,
+		.h_total_size = 2844,
+		.v_total_size = 1968,
+		.isp_h_offset = 16,
+		.isp_v_offset = 6,
+		.h_odd_ss_inc = 1,
+		.h_even_ss_inc = 1,
+		.v_odd_ss_inc = 1,
+		.v_even_ss_inc = 1,
+	},
+	[OV5640_SIZE_VGA] = {
+		.x_addr_start = 0,
+		.y_addr_start = 0,
+		.x_addr_end = 2623,
+		.y_addr_end = 1951,
+		.h_output_size = 640,
+		.v_output_size = 480,
+		.h_total_size = 2844,
+		.v_total_size = 1968,
+		.isp_h_offset = 16,
+		.isp_v_offset = 6,
+		.h_odd_ss_inc = 1,
+		.h_even_ss_inc = 1,
+		.v_odd_ss_inc = 1,
+		.v_even_ss_inc = 1,
+	},
+	[OV5640_SIZE_720P] = {
+		.x_addr_start = 336,
+		.y_addr_start = 434,
+		.x_addr_end = 2287,
+		.y_addr_end = 1522,
+		.h_output_size = 1280,
+		.v_output_size = 720,
+		.h_total_size = 2500,
+		.v_total_size = 1120,
+		.isp_h_offset = 16,
+		.isp_v_offset = 4,
+		.h_odd_ss_inc = 1,
+		.h_even_ss_inc = 1,
+		.v_odd_ss_inc = 1,
+		.v_even_ss_inc = 1,
+	},
+	[OV5640_SIZE_1080P] = {
+		.x_addr_start = 336,
+		.y_addr_start = 434,
+		.x_addr_end = 2287,
+		.y_addr_end = 1522,
+		.h_output_size = 1920,
+		.v_output_size = 1080,
+		.h_total_size = 2500,
+		.v_total_size = 1120,
+		.isp_h_offset = 16,
+		.isp_v_offset = 4,
+		.h_odd_ss_inc = 1,
+		.h_even_ss_inc = 1,
+		.v_odd_ss_inc = 1,
+		.v_even_ss_inc = 1,
+	},
+	[OV5640_SIZE_5MP] = {
+		.x_addr_start = 0,
+		.y_addr_start = 0,
+		.x_addr_end = 2623,
+		.y_addr_end = 1951,
+		.h_output_size = 2592,
+		.v_output_size = 1944,
+		.h_total_size = 2844,
+		.v_total_size = 1968,
+		.isp_h_offset = 16,
+		.isp_v_offset = 6,
+		.h_odd_ss_inc = 1,
+		.h_even_ss_inc = 1,
+		.v_odd_ss_inc = 1,
+		.v_even_ss_inc = 1,
+	},
+};
+
+/**
+ * ov5640_reg_read - Read a value from a register in an ov5640 sensor device
+ * @client: i2c driver client structure
+ * @reg: register address / offset
+ * @val: stores the value that gets read
+ *
+ * Read a value from a register in an ov5640 sensor device.
+ * The value is returned in 'val'.
+ * Returns zero if successful, or non-zero otherwise.
+ */
+static int ov5640_reg_read(struct i2c_client *client, u16 reg, u8 *val)
+{
+	int ret;
+	u8 data[2] = {0};
+	struct i2c_msg msg = {
+		.addr	= client->addr,
+		.flags	= 0,
+		.len	= 2,
+		.buf	= data,
+	};
+
+	data[0] = (u8)(reg >> 8);
+	data[1] = (u8)(reg & 0xff);
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0)
+		goto err;
+
+	msg.flags = I2C_M_RD;
+	msg.len = 1;
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0)
+		goto err;
+
+	*val = data[0];
+	return 0;
+
+err:
+	dev_err(&client->dev, "Failed reading register 0x%02x!\n", reg);
+	return ret;
+}
+
+/**
+ * Write a value to a register in ov5640 sensor device.
+ * @client: i2c driver client structure.
+ * @reg: Address of the register to read value from.
+ * @val: Value to be written to a specific register.
+ * Returns zero if successful, or non-zero otherwise.
+ */
+static int ov5640_reg_write(struct i2c_client *client, u16 reg, u8 val)
+{
+	int ret;
+	unsigned char data[3] = { (u8)(reg >> 8), (u8)(reg & 0xff), val };
+	struct i2c_msg msg = {
+		.addr	= client->addr,
+		.flags	= 0,
+		.len	= 3,
+		.buf	= data,
+	};
+
+	ret = i2c_transfer(client->adapter, &msg, 1);
+	if (ret < 0) {
+		dev_err(&client->dev, "Failed writing register 0x%02x!\n", reg);
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * Initialize a list of ov5640 registers.
+ * The list of registers is terminated by the pair of values
+ * @client: i2c driver client structure.
+ * @reglist[]: List of address of the registers to write data.
+ * Returns zero if successful, or non-zero otherwise.
+ */
+static int ov5640_reg_writes(struct i2c_client *client,
+			     const struct ov5640_reg reglist[],
+			     int size)
+{
+	int err = 0, i;
+
+	for (i = 0; i < size; i++) {
+		err = ov5640_reg_write(client, reglist[i].reg,
+				reglist[i].val);
+		if (err)
+			return err;
+	}
+	return 0;
+}
+
+static int ov5640_reg_set(struct i2c_client *client, u16 reg, u8 val)
+{
+	int ret;
+	u8 tmpval = 0;
+
+	ret = ov5640_reg_read(client, reg, &tmpval);
+	if (ret)
+		return ret;
+
+	return ov5640_reg_write(client, reg, tmpval | val);
+}
+
+static int ov5640_reg_clr(struct i2c_client *client, u16 reg, u8 val)
+{
+	int ret;
+	u8 tmpval = 0;
+
+	ret = ov5640_reg_read(client, reg, &tmpval);
+	if (ret)
+		return ret;
+
+	return ov5640_reg_write(client, reg, tmpval & ~val);
+}
+
+static int ov5640_config_timing(struct v4l2_subdev *sd)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	struct ov5640 *ov5640 = to_ov5640(sd);
+	int ret, i;
+
+	i = ov5640_find_framesize(ov5640->format.width, ov5640->format.height);
+
+	ret = ov5640_reg_write(client,
+			0x3800,
+			(timing_cfg[i].x_addr_start & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3801,
+			timing_cfg[i].x_addr_start & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3802,
+			(timing_cfg[i].y_addr_start & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3803,
+			timing_cfg[i].y_addr_start & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3804,
+			(timing_cfg[i].x_addr_end & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3805,
+			timing_cfg[i].x_addr_end & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3806,
+			(timing_cfg[i].y_addr_end & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3807,
+			timing_cfg[i].y_addr_end & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3808,
+			(timing_cfg[i].h_output_size & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3809,
+			timing_cfg[i].h_output_size & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x380A,
+			(timing_cfg[i].v_output_size & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x380B,
+			timing_cfg[i].v_output_size & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x380C,
+			(timing_cfg[i].h_total_size & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x380D,
+			timing_cfg[i].h_total_size & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x380E,
+			(timing_cfg[i].v_total_size & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x380F,
+			timing_cfg[i].v_total_size & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3810,
+			(timing_cfg[i].isp_h_offset & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3811,
+			timing_cfg[i].isp_h_offset & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3812,
+			(timing_cfg[i].isp_v_offset & 0xFF00) >> 8);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3813,
+			timing_cfg[i].isp_v_offset & 0xFF);
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3814,
+			((timing_cfg[i].h_odd_ss_inc & 0xF) << 4) |
+			(timing_cfg[i].h_even_ss_inc & 0xF));
+	if (ret)
+		return ret;
+
+	ret = ov5640_reg_write(client,
+			0x3815,
+			((timing_cfg[i].v_odd_ss_inc & 0xF) << 4) |
+			(timing_cfg[i].v_even_ss_inc & 0xF));
+
+	return ret;
+}
+
+static struct v4l2_mbus_framefmt *
+__ov5640_get_pad_format(struct ov5640 *ov5640, struct v4l2_subdev_fh *fh,
+			 unsigned int pad, enum v4l2_subdev_format_whence which)
+{
+	switch (which) {
+	case V4L2_SUBDEV_FORMAT_TRY:
+		return v4l2_subdev_get_try_format(fh, pad);
+	case V4L2_SUBDEV_FORMAT_ACTIVE:
+		return &ov5640->format;
+	default:
+		return NULL;
+	}
+}
+
+/* -----------------------------------------------------------------------------
+ * V4L2 subdev internal operations
+ */
+
+static int ov5640_s_power(struct v4l2_subdev *sd, int on)
+{
+	struct ov5640 *ov5640 = to_ov5640(sd);
+
+	return ov5640->pdata->s_power(sd, on);
+}
+
+static struct v4l2_subdev_core_ops ov5640_subdev_core_ops = {
+	.s_power	= ov5640_s_power,
+};
+
+static int ov5640_g_fmt(struct v4l2_subdev *sd,
+			struct v4l2_subdev_fh *fh,
+			struct v4l2_subdev_format *format)
+{
+	struct ov5640 *ov5640 = to_ov5640(sd);
+
+	format->format = *__ov5640_get_pad_format(ov5640, fh, format->pad,
+						   format->which);
+
+	return 0;
+}
+
+static int ov5640_s_fmt(struct v4l2_subdev *sd,
+			struct v4l2_subdev_fh *fh,
+			struct v4l2_subdev_format *format)
+{
+	struct ov5640 *ov5640 = to_ov5640(sd);
+	struct v4l2_mbus_framefmt *__format;
+
+	__format = __ov5640_get_pad_format(ov5640, fh, format->pad,
+					    format->which);
+
+	*__format = format->format;
+
+	/* NOTE: This is always true for now, revisit later. */
+	ov5640->pixel_rate->cur.val64 = 42000000;
+
+	return 0;
+}
+
+static int ov5640_enum_fmt(struct v4l2_subdev *subdev,
+			   struct v4l2_subdev_fh *fh,
+			   struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index >= 2)
+		return -EINVAL;
+
+	switch (code->index) {
+	case 0:
+		code->code = V4L2_MBUS_FMT_UYVY8_1X16;
+		break;
+	case 1:
+		code->code = V4L2_MBUS_FMT_YUYV8_1X16;
+		break;
+	}
+	return 0;
+}
+
+static int ov5640_enum_framesizes(struct v4l2_subdev *subdev,
+				   struct v4l2_subdev_fh *fh,
+				   struct v4l2_subdev_frame_size_enum *fse)
+{
+	if ((fse->index >= OV5640_SIZE_LAST) ||
+	    (fse->code != V4L2_MBUS_FMT_UYVY8_1X16 &&
+	     fse->code != V4L2_MBUS_FMT_YUYV8_1X16))
+		return -EINVAL;
+
+	fse->min_width = ov5640_frmsizes[fse->index].width;
+	fse->max_width = fse->min_width;
+	fse->min_height = ov5640_frmsizes[fse->index].height;
+	fse->max_height = fse->min_height;
+
+	return 0;
+}
+
+static int ov5640_s_stream(struct v4l2_subdev *sd, int enable)
+{
+	struct ov5640 *ov5640 = to_ov5640(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+	int ret = 0;
+
+	if (enable) {
+		u8 fmtreg = 0, fmtmuxreg = 0;
+		int i;
+
+		switch ((u32)ov5640->format.code) {
+		case V4L2_MBUS_FMT_UYVY8_1X16:
+			fmtreg = 0x32;
+			fmtmuxreg = 0;
+			break;
+		case V4L2_MBUS_FMT_YUYV8_1X16:
+			fmtreg = 0x30;
+			fmtmuxreg = 0;
+			break;
+		default:
+			/* This shouldn't happen */
+			ret = -EINVAL;
+			return ret;
+		}
+
+		ret = ov5640_reg_write(client, 0x4300, fmtreg);
+		if (ret)
+			return ret;
+
+		ret = ov5640_reg_write(client, 0x501F, fmtmuxreg);
+		if (ret)
+			return ret;
+
+		ret = ov5640_config_timing(sd);
+		if (ret)
+			return ret;
+
+		i = ov5640_find_framesize(ov5640->format.width, ov5640->format.height);
+		if ((i == OV5640_SIZE_QVGA) ||
+		    (i == OV5640_SIZE_VGA) ||
+		    (i == OV5640_SIZE_720P)) {
+			ret = ov5640_reg_write(client, 0x3108,
+					(i == OV5640_SIZE_720P) ? 0x1 : 0);
+			if (ret)
+				return ret;
+			ret = ov5640_reg_set(client, 0x5001, 0x20);
+		} else {
+			ret = ov5640_reg_clr(client, 0x5001, 0x20);
+			if (ret)
+				return ret;
+			ret = ov5640_reg_write(client, 0x3108, 0x2);
+		}
+
+		ret = ov5640_reg_clr(client, 0x3008, 0x40);
+		if (ret)
+			goto out;
+	} else {
+		u8 tmpreg = 0;
+
+		ret = ov5640_reg_read(client, 0x3008, &tmpreg);
+		if (ret)
+			goto out;
+
+		ret = ov5640_reg_write(client, 0x3008, tmpreg | 0x40);
+		if (ret)
+			goto out;
+	}
+
+out:
+	return ret;
+}
+
+static struct v4l2_subdev_video_ops ov5640_subdev_video_ops = {
+	.s_stream	= ov5640_s_stream,
+};
+
+static struct v4l2_subdev_pad_ops ov5640_subdev_pad_ops = {
+	.enum_mbus_code = ov5640_enum_fmt,
+	.enum_frame_size = ov5640_enum_framesizes,
+	.get_fmt = ov5640_g_fmt,
+	.set_fmt = ov5640_s_fmt,
+};
+
+static int ov5640_g_skip_frames(struct v4l2_subdev *sd, u32 *frames)
+{
+	/* Quantity of initial bad frames to skip. Revisit. */
+	*frames = 3;
+
+	return 0;
+}
+
+static struct v4l2_subdev_sensor_ops ov5640_subdev_sensor_ops = {
+	.g_skip_frames	= ov5640_g_skip_frames,
+};
+
+static struct v4l2_subdev_ops ov5640_subdev_ops = {
+	.core	= &ov5640_subdev_core_ops,
+	.video	= &ov5640_subdev_video_ops,
+	.pad	= &ov5640_subdev_pad_ops,
+	.sensor	= &ov5640_subdev_sensor_ops,
+};
+
+static int ov5640_registered(struct v4l2_subdev *subdev)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(subdev);
+	struct ov5640 *ov5640 = to_ov5640(subdev);
+	int ret = 0;
+	u8 revision = 0;
+
+	ret = ov5640_s_power(subdev, 1);
+	if (ret < 0) {
+		dev_err(&client->dev, "OV5640 power up failed\n");
+		return ret;
+	}
+
+	ret = ov5640_reg_read(client, 0x302A, &revision);
+	if (ret) {
+		dev_err(&client->dev, "Failure to detect OV5640 chip\n");
+		goto out;
+	}
+
+	revision &= 0xF;
+
+	dev_info(&client->dev, "Detected a OV5640 chip, revision %x\n",
+		 revision);
+
+	/* SW Reset */
+	ret = ov5640_reg_set(client, 0x3008, 0x80);
+	if (ret)
+		goto out;
+
+	msleep(2);
+
+	ret = ov5640_reg_clr(client, 0x3008, 0x80);
+	if (ret)
+		goto out;
+
+	/* SW Powerdown */
+	ret = ov5640_reg_set(client, 0x3008, 0x40);
+	if (ret)
+		goto out;
+
+	ret = ov5640_reg_writes(client, configscript_common1,
+			ARRAY_SIZE(configscript_common1));
+	if (ret)
+		goto out;
+
+	ret = ov5640_reg_writes(client, configscript_common2,
+			ARRAY_SIZE(configscript_common2));
+	if (ret)
+		goto out;
+
+	/* Init controls */
+	ret = v4l2_ctrl_handler_init(&ov5640->ctrl_handler, 1);
+	if (ret)
+		goto out;
+
+	ov5640->pixel_rate = v4l2_ctrl_new_std(
+				&ov5640->ctrl_handler, NULL,
+				V4L2_CID_PIXEL_RATE,
+				0, 0, 1, 0);
+
+	subdev->ctrl_handler = &ov5640->ctrl_handler;
+out:
+	ov5640_s_power(subdev, 0);
+
+	return ret;
+}
+
+static int ov5640_open(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
+{
+	struct v4l2_mbus_framefmt *format;
+
+	format = v4l2_subdev_get_try_format(fh, 0);
+	format->code = V4L2_MBUS_FMT_UYVY8_1X16;
+	format->width = ov5640_frmsizes[OV5640_SIZE_VGA].width;
+	format->height = ov5640_frmsizes[OV5640_SIZE_VGA].height;
+	format->field = V4L2_FIELD_NONE;
+	format->colorspace = V4L2_COLORSPACE_JPEG;
+
+	return 0;
+}
+
+static int ov5640_close(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh)
+{
+	return 0;
+}
+
+static struct v4l2_subdev_internal_ops ov5640_subdev_internal_ops = {
+	.registered = ov5640_registered,
+	.open = ov5640_open,
+	.close = ov5640_close,
+};
+
+static int ov5640_probe(struct i2c_client *client,
+			 const struct i2c_device_id *did)
+{
+	struct ov5640 *ov5640;
+	int ret;
+
+	if (!client->dev.platform_data) {
+		dev_err(&client->dev, "No platform data!!\n");
+		return -ENODEV;
+	}
+
+	ov5640 = kzalloc(sizeof(*ov5640), GFP_KERNEL);
+	if (!ov5640)
+		return -ENOMEM;
+
+	ov5640->pdata = client->dev.platform_data;
+
+	ov5640->format.code = V4L2_MBUS_FMT_UYVY8_1X16;
+	ov5640->format.width = ov5640_frmsizes[OV5640_SIZE_VGA].width;
+	ov5640->format.height = ov5640_frmsizes[OV5640_SIZE_VGA].height;
+	ov5640->format.field = V4L2_FIELD_NONE;
+	ov5640->format.colorspace = V4L2_COLORSPACE_JPEG;
+
+	v4l2_i2c_subdev_init(&ov5640->subdev, client, &ov5640_subdev_ops);
+	ov5640->subdev.internal_ops = &ov5640_subdev_internal_ops;
+	ov5640->subdev.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+	ov5640->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_SENSOR;
+
+	ov5640->pad.flags = MEDIA_PAD_FL_SOURCE;
+	ret = media_entity_init(&ov5640->subdev.entity, 1, &ov5640->pad, 0);
+	if (ret < 0)
+		goto err_mediainit;
+
+	return ret;
+
+err_mediainit:
+	v4l2_device_unregister_subdev(&ov5640->subdev);
+	kfree(ov5640);
+	return ret;
+}
+
+static int ov5640_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *subdev = i2c_get_clientdata(client);
+	struct ov5640 *ov5640 = to_ov5640(subdev);
+
+	v4l2_ctrl_handler_free(&ov5640->ctrl_handler);
+	v4l2_device_unregister_subdev(subdev);
+	media_entity_cleanup(&subdev->entity);
+	kfree(ov5640);
+	return 0;
+}
+
+static const struct i2c_device_id ov5640_id[] = {
+	{ "ov5640", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ov5640_id);
+
+static struct i2c_driver ov5640_i2c_driver = {
+	.driver = {
+		.name = "ov5640",
+	},
+	.probe		= ov5640_probe,
+	.remove		= ov5640_remove,
+	.id_table	= ov5640_id,
+};
+
+static int __init ov5640_mod_init(void)
+{
+	return i2c_add_driver(&ov5640_i2c_driver);
+}
+
+static void __exit ov5640_mod_exit(void)
+{
+	i2c_del_driver(&ov5640_i2c_driver);
+}
+
+module_init(ov5640_mod_init);
+module_exit(ov5640_mod_exit);
+
+MODULE_DESCRIPTION("OmniVision OV5640 Camera driver");
+MODULE_AUTHOR("Sergio Aguirre <saaguirre@xxxxxx>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/media/ov5640.h b/include/media/ov5640.h
new file mode 100644
index 0000000..65625ce
--- /dev/null
+++ b/include/media/ov5640.h
@@ -0,0 +1,10 @@
+#ifndef _MEDIA_OV5640_H
+#define _MEDIA_OV5640_H
+
+#include <media/v4l2-subdev.h>
+
+struct ov5640_platform_data {
+      int (*s_power)(struct v4l2_subdev *subdev, int on);
+};
+
+#endif
-- 
1.7.5.4

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