Message-Id: <26e5a587f1ba9e2fbbc04284408305bc8cf8c5c0.1486136893.git.roliveir@synopsys.com>
Date:   Fri,  3 Feb 2017 18:18:33 +0000
From:   Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Cc:     CARLOS.PALMINHA@...opsys.com,
        Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Pavel Machek <pavel@....cz>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Rob Herring <robh+dt@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Steve Longerbeam <slongerbeam@...il.com>
Subject: [PATCH RESEND v7 2/2] Add support for OV5647 sensor.

Modes supported:
 - 640x480 RAW 8

Signed-off-by: Ramiro Oliveira <roliveir@...opsys.com>
Acked-by: Pavel Machek <pavel@....cz>
---
 MAINTAINERS                |   7 +
 drivers/media/i2c/Kconfig  |  12 +
 drivers/media/i2c/Makefile |   1 +
 drivers/media/i2c/ov5647.c | 718 +++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 738 insertions(+)
 create mode 100644 drivers/media/i2c/ov5647.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 421adffbe376..56f392fd2c39 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9101,6 +9101,13 @@ M:	Harald Welte <laforge@...monks.org>
 S:	Maintained
 F:	drivers/char/pcmcia/cm4040_cs.*
 
+OMNIVISION OV5647 SENSOR DRIVER
+M:	Ramiro Oliveira <roliveir@...opsys.com>
+L:	linux-media@...r.kernel.org
+T:	git git://linuxtv.org/media_tree.git
+S:	Maintained
+F:	drivers/media/i2c/ov5647.c
+
 OMNIVISION OV7670 SENSOR DRIVER
 M:	Jonathan Corbet <corbet@....net>
 L:	linux-media@...r.kernel.org
diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
index cee1dae6e014..ac388be5f9a8 100644
--- a/drivers/media/i2c/Kconfig
+++ b/drivers/media/i2c/Kconfig
@@ -531,6 +531,18 @@ config VIDEO_OV2659
 	  To compile this driver as a module, choose M here: the
 	  module will be called ov2659.
 
+config VIDEO_OV5647
+	tristate "OmniVision OV5647 sensor support"
+	depends on OF
+	depends on I2C && VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
+	depends on MEDIA_CAMERA_SUPPORT
+	---help---
+	  This is a Video4Linux2 sensor-level driver for the OmniVision
+	  OV5647 camera.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ov5647.
+
 config VIDEO_OV7640
 	tristate "OmniVision OV7640 sensor support"
 	depends on I2C && VIDEO_V4L2
diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
index 5bc7bbeb5499..ef2ccf65f94c 100644
--- a/drivers/media/i2c/Makefile
+++ b/drivers/media/i2c/Makefile
@@ -83,3 +83,4 @@ obj-$(CONFIG_VIDEO_IR_I2C)  += ir-kbd-i2c.o
 obj-$(CONFIG_VIDEO_ML86V7667)	+= ml86v7667.o
 obj-$(CONFIG_VIDEO_OV2659)	+= ov2659.o
 obj-$(CONFIG_VIDEO_TC358743)	+= tc358743.o
+obj-$(CONFIG_VIDEO_OV5647)	+= ov5647.o
diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
new file mode 100644
index 000000000000..c2828650d3a3
--- /dev/null
+++ b/drivers/media/i2c/ov5647.c
@@ -0,0 +1,718 @@
+/*
+ * A V4L2 driver for OmniVision OV5647 cameras.
+ *
+ * Based on Samsung S5K6AAFX SXGA 1/6" 1.3M CMOS Image Sensor driver
+ * Copyright (C) 2011 Sylwester Nawrocki <s.nawrocki@...sung.com>
+ *
+ * Based on Omnivision OV7670 Camera Driver
+ * Copyright (C) 2006-7 Jonathan Corbet <corbet@....net>
+ *
+ * Copyright (C) 2016, Synopsys, Inc.
+ *
+ * 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/clk.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-image-sizes.h>
+#include <media/v4l2-mediabus.h>
+#include <media/v4l2-of.h>
+
+#define SENSOR_NAME "ov5647"
+
+#define OV5647_SW_RESET		0x1003
+#define OV5647_REG_CHIPID_H	0x300A
+#define OV5647_REG_CHIPID_L	0x300B
+
+#define REG_TERM 0xfffe
+#define VAL_TERM 0xfe
+#define REG_DLY  0xffff
+
+#define OV5647_ROW_START		0x01
+#define OV5647_ROW_START_MIN		0
+#define OV5647_ROW_START_MAX		2004
+#define OV5647_ROW_START_DEF		54
+
+#define OV5647_COLUMN_START		0x02
+#define OV5647_COLUMN_START_MIN		0
+#define OV5647_COLUMN_START_MAX		2750
+#define OV5647_COLUMN_START_DEF		16
+
+#define OV5647_WINDOW_HEIGHT		0x03
+#define OV5647_WINDOW_HEIGHT_MIN	2
+#define OV5647_WINDOW_HEIGHT_MAX	2006
+#define OV5647_WINDOW_HEIGHT_DEF	1944
+
+#define OV5647_WINDOW_WIDTH		0x04
+#define OV5647_WINDOW_WIDTH_MIN		2
+#define OV5647_WINDOW_WIDTH_MAX		2752
+#define OV5647_WINDOW_WIDTH_DEF		2592
+
+struct regval_list {
+	u16 addr;
+	u8 data;
+};
+
+struct cfg_array {
+	struct regval_list *regs;
+	int size;
+};
+
+struct ov5647 {
+	struct device			*dev;
+	struct v4l2_subdev		sd;
+	struct media_pad		pad;
+	struct mutex			lock;
+	struct v4l2_mbus_framefmt	format;
+	unsigned int			width;
+	unsigned int			height;
+	int				power_count;
+	struct clk			*xclk;
+	/* External clock frequency currently supported is 30MHz */
+	u32				xclk_freq;
+};
+
+static inline struct ov5647 *to_state(struct v4l2_subdev *sd)
+{
+	return container_of(sd, struct ov5647, sd);
+}
+
+static struct regval_list sensor_oe_disable_regs[] = {
+	{0x3000, 0x00},
+	{0x3001, 0x00},
+	{0x3002, 0x00},
+};
+
+static struct regval_list sensor_oe_enable_regs[] = {
+	{0x3000, 0x0f},
+	{0x3001, 0xff},
+	{0x3002, 0xe4},
+};
+
+static struct regval_list ov5647_640x480[] = {
+	{0x0100, 0x00},
+	{0x0103, 0x01},
+	{0x3034, 0x08},
+	{0x3035, 0x21},
+	{0x3036, 0x46},
+	{0x303c, 0x11},
+	{0x3106, 0xf5},
+	{0x3821, 0x07},
+	{0x3820, 0x41},
+	{0x3827, 0xec},
+	{0x370c, 0x0f},
+	{0x3612, 0x59},
+	{0x3618, 0x00},
+	{0x5000, 0x06},
+	{0x5001, 0x01},
+	{0x5002, 0x41},
+	{0x5003, 0x08},
+	{0x5a00, 0x08},
+	{0x3000, 0x00},
+	{0x3001, 0x00},
+	{0x3002, 0x00},
+	{0x3016, 0x08},
+	{0x3017, 0xe0},
+	{0x3018, 0x44},
+	{0x301c, 0xf8},
+	{0x301d, 0xf0},
+	{0x3a18, 0x00},
+	{0x3a19, 0xf8},
+	{0x3c01, 0x80},
+	{0x3b07, 0x0c},
+	{0x380c, 0x07},
+	{0x380d, 0x68},
+	{0x380e, 0x03},
+	{0x380f, 0xd8},
+	{0x3814, 0x31},
+	{0x3815, 0x31},
+	{0x3708, 0x64},
+	{0x3709, 0x52},
+	{0x3808, 0x02},
+	{0x3809, 0x80},
+	{0x380a, 0x01},
+	{0x380b, 0xE0},
+	{0x3801, 0x00},
+	{0x3802, 0x00},
+	{0x3803, 0x00},
+	{0x3804, 0x0a},
+	{0x3805, 0x3f},
+	{0x3806, 0x07},
+	{0x3807, 0xa1},
+	{0x3811, 0x08},
+	{0x3813, 0x02},
+	{0x3630, 0x2e},
+	{0x3632, 0xe2},
+	{0x3633, 0x23},
+	{0x3634, 0x44},
+	{0x3636, 0x06},
+	{0x3620, 0x64},
+	{0x3621, 0xe0},
+	{0x3600, 0x37},
+	{0x3704, 0xa0},
+	{0x3703, 0x5a},
+	{0x3715, 0x78},
+	{0x3717, 0x01},
+	{0x3731, 0x02},
+	{0x370b, 0x60},
+	{0x3705, 0x1a},
+	{0x3f05, 0x02},
+	{0x3f06, 0x10},
+	{0x3f01, 0x0a},
+	{0x3a08, 0x01},
+	{0x3a09, 0x27},
+	{0x3a0a, 0x00},
+	{0x3a0b, 0xf6},
+	{0x3a0d, 0x04},
+	{0x3a0e, 0x03},
+	{0x3a0f, 0x58},
+	{0x3a10, 0x50},
+	{0x3a1b, 0x58},
+	{0x3a1e, 0x50},
+	{0x3a11, 0x60},
+	{0x3a1f, 0x28},
+	{0x4001, 0x02},
+	{0x4004, 0x02},
+	{0x4000, 0x09},
+	{0x4837, 0x24},
+	{0x4050, 0x6e},
+	{0x4051, 0x8f},
+	{0x0100, 0x01},
+};
+
+/**
+ * @short I2C Write operation
+ * @param[in] i2c_client I2C client
+ * @param[in] reg register address
+ * @param[in] val value to write
+ * @return Error code
+ */
+static int ov5647_write(struct v4l2_subdev *sd, u16 reg, u8 val)
+{
+	int ret;
+	unsigned char data[3] = { reg >> 8, reg & 0xff, val};
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ret = i2c_master_send(client, data, 3);
+	if (ret != 3) {
+		dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n",
+				__func__, reg);
+		return ret < 0 ? ret : -EIO;
+	}
+	return 0;
+}
+
+/**
+ * @short I2C Read operation
+ * @param[in] i2c_client I2C client
+ * @param[in] reg register address
+ * @param[out] val value read
+ * @return Error code
+ */
+static int ov5647_read(struct v4l2_subdev *sd, u16 reg, u8 *val)
+{
+	int ret;
+	unsigned char data_w[2] = { reg >> 8, reg & 0xff };
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+
+	ret = i2c_master_send(client, data_w, 2);
+
+	if (ret < 2) {
+		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
+			__func__, reg);
+		return ret < 0 ? ret : -EIO;
+	}
+
+
+	ret = i2c_master_recv(client, val, 1);
+
+	if (ret < 1) {
+		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
+				__func__, reg);
+		return ret < 0 ? ret : -EIO;
+	}
+	return 0;
+}
+
+static int ov5647_write_array(struct v4l2_subdev *sd,
+				struct regval_list *regs, int array_size)
+{
+	int i = 0;
+	int ret = 0;
+
+	if (!regs)
+		return -EINVAL;
+
+	while (i < array_size) {
+		ret = ov5647_write(sd, regs->addr, regs->data);
+		if (ret < 0)
+			return ret;
+		i++;
+		regs++;
+	}
+	return 0;
+}
+
+static void ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel)
+{
+	u8 channel_id;
+
+	ov5647_read(sd, 0x4814, &channel_id);
+	channel_id &= ~(3 << 6);
+	ov5647_write(sd, 0x4814, channel_id | (channel << 6));
+}
+
+void ov5647_stream_on(struct v4l2_subdev *sd)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ov5647_write(sd, 0x4202, 0x00);
+	dev_dbg(&client->dev, "Stream on");
+	ov5647_write(sd, 0x300D, 0x00);
+}
+
+void ov5647_stream_off(struct v4l2_subdev *sd)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ov5647_write(sd, 0x4202, 0x0f);
+	dev_dbg(&client->dev, "Stream off");
+	ov5647_write(sd, 0x300D, 0x01);
+}
+
+/**
+ * @short Set SW standby
+ * @param[in] sd v4l2 sd
+ * @param[in] stanby standby mode status (on or off)
+ * @return Error code
+ */
+static int set_sw_standby(struct v4l2_subdev *sd, bool standby)
+{
+	int ret;
+	unsigned char rdval;
+
+	ret = ov5647_read(sd, 0x0100, &rdval);
+	if (ret != 0)
+		return ret;
+
+	if (standby)
+		rdval &= 0xfe;
+	else
+		rdval |= 0x01;
+
+	ret = ov5647_write(sd, 0x0100, rdval);
+
+	return ret;
+}
+
+/**
+ * @short Initialize sensor
+ * @param[in] sd v4l2 subdev
+ * @param[in] val not used
+ * @return Error code
+ */
+static int __sensor_init(struct v4l2_subdev *sd)
+{
+	int ret;
+	u8 resetval;
+	u8 rdval;
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	dev_dbg(&client->dev, "sensor init\n");
+
+	ret = ov5647_read(sd, 0x0100, &rdval);
+	if (ret != 0)
+		return ret;
+
+	ov5647_write(sd, 0x4800, 0x25);
+	ov5647_stream_off(sd);
+
+	ret = ov5647_write_array(sd, ov5647_640x480,
+					ARRAY_SIZE(ov5647_640x480));
+	if (ret < 0) {
+		dev_err(&client->dev, "write sensor_default_regs error\n");
+		return ret;
+	}
+
+	ov5647_set_virtual_channel(sd, 0);
+
+	ov5647_read(sd, 0x0100, &resetval);
+	if (!(resetval & 0x01)) {
+		dev_err(&client->dev, "Device was in SW standby");
+		ov5647_write(sd, 0x0100, 0x01);
+	}
+
+	ov5647_write(sd, 0x4800, 0x04);
+	ov5647_stream_on(sd);
+
+	return 0;
+}
+
+/**
+ * @short Control sensor power state
+ * @param[in] sd v4l2 subdev
+ * @param[in] on Sensor power
+ * @return Error code
+ */
+static int sensor_power(struct v4l2_subdev *sd, int on)
+{
+	int ret;
+	struct ov5647 *ov5647 = to_state(sd);
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ret = 0;
+	mutex_lock(&ov5647->lock);
+
+	if (on && !ov5647->power_count)	{
+		dev_dbg(&client->dev, "OV5647 power on\n");
+
+		clk_set_rate(ov5647->xclk, ov5647->xclk_freq);
+
+		ret = clk_prepare_enable(ov5647->xclk);
+		if (ret < 0) {
+			dev_err(ov5647->dev, "clk prepare enable failed\n");
+			goto out;
+		}
+
+		ret = ov5647_write_array(sd, sensor_oe_enable_regs,
+				ARRAY_SIZE(sensor_oe_enable_regs));
+		if (ret < 0) {
+			clk_disable_unprepare(ov5647->xclk);
+			dev_err(&client->dev,
+				"write sensor_oe_enable_regs error\n");
+			goto out;
+		}
+
+		ret = __sensor_init(sd);
+		if (ret < 0) {
+			clk_disable_unprepare(ov5647->xclk);
+			dev_err(&client->dev,
+				"Camera not available, check Power\n");
+			goto out;
+		}
+	} else if (!on && ov5647->power_count == 1) {
+		dev_dbg(&client->dev, "OV5647 power off\n");
+
+		dev_dbg(&client->dev, "disable oe\n");
+		ret = ov5647_write_array(sd, sensor_oe_disable_regs,
+				ARRAY_SIZE(sensor_oe_disable_regs));
+
+		if (ret < 0)
+			dev_dbg(&client->dev, "disable oe failed\n");
+
+		ret = set_sw_standby(sd, true);
+
+		if (ret < 0)
+			dev_dbg(&client->dev, "soft stby failed\n");
+
+		clk_disable_unprepare(ov5647->xclk);
+	}
+
+	/* Update the power count. */
+	ov5647->power_count += on ? 1 : -1;
+	WARN_ON(ov5647->power_count < 0);
+
+out:
+	mutex_unlock(&ov5647->lock);
+
+	return ret;
+}
+
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+/**
+ * @short Get register value
+ * @param[in] sd v4l2 subdev
+ * @param[in] reg register struct
+ * @return Error code
+ */
+static int sensor_get_register(struct v4l2_subdev *sd,
+				struct v4l2_dbg_register *reg)
+{
+	unsigned char val = 0;
+	int ret;
+
+	ret = ov5647_read(sd, reg->reg & 0xff, &val);
+	if (ret != 0)
+		return ret;
+
+	reg->val = val;
+	reg->size = 1;
+
+	return ret;
+}
+
+/**
+ * @short Set register value
+ * @param[in] sd v4l2 subdev
+ * @param[in] reg register struct
+ * @return Error code
+ */
+static int sensor_set_register(struct v4l2_subdev *sd,
+				const struct v4l2_dbg_register *reg)
+{
+	return ov5647_write(sd, reg->reg & 0xff, reg->val & 0xff);
+}
+#endif
+
+/**
+ * @short Subdev core operations registration
+ */
+static const struct v4l2_subdev_core_ops sensor_core_ops = {
+	.s_power		= sensor_power,
+#ifdef CONFIG_VIDEO_ADV_DEBUG
+	.g_register		= sensor_get_register,
+	.s_register		= sensor_set_register,
+#endif
+};
+
+static int enum_mbus_code(struct v4l2_subdev *sd,
+				struct v4l2_subdev_pad_config *cfg,
+				struct v4l2_subdev_mbus_code_enum *code)
+{
+	if (code->index > 0)
+		return -EINVAL;
+
+	code->code = MEDIA_BUS_FMT_SBGGR8_1X8;
+
+	return 0;
+}
+
+static const struct v4l2_subdev_pad_ops subdev_pad_ops = {
+	.enum_mbus_code = enum_mbus_code,
+};
+
+
+/**
+ * @short Subdev operations registration
+ *
+ */
+static const struct v4l2_subdev_ops subdev_ops = {
+	.core		= &sensor_core_ops,
+	.pad		= &subdev_pad_ops,
+};
+
+/**
+ * @short Detect camera version and model
+ * @param[in] sd v4l2 subdev
+ * @return Error code
+ */
+static int ov5647_detect(struct v4l2_subdev *sd)
+{
+	unsigned char v;
+	int ret;
+	struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+	ret = ov5647_write(sd, OV5647_SW_RESET, 0x01);
+	if (ret < 0)
+		return ret;
+	ret = ov5647_read(sd, OV5647_REG_CHIPID_H, &v);
+	if (ret < 0)
+		return ret;
+	if (v != 0x56) {
+		dev_err(&client->dev, "Wrong model version detected");
+		return -ENODEV;
+	}
+	ret = ov5647_read(sd, OV5647_REG_CHIPID_L, &v);
+	if (ret < 0)
+		return ret;
+	if (v != 0x47) {
+		dev_err(&client->dev, "Wrong model version detected");
+		return -ENODEV;
+	}
+
+	ret = ov5647_write(sd, OV5647_SW_RESET, 0x00);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+/**
+ * @short Detect if camera is registered
+ * @param[in] sd v4l2 subdev
+ * @return Error code
+ */
+static int ov5647_registered(struct v4l2_subdev *sd)
+{
+	return 0;
+}
+
+/**
+ * @short Open device
+ * @param[in] sd v4l2 subdev
+ * @param[in] fh v4l2 file handler
+ * @return Error code
+ */
+static int ov5647_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	struct v4l2_mbus_framefmt *format =
+				v4l2_subdev_get_try_format(sd, fh->pad, 0);
+	struct v4l2_rect *crop =
+				v4l2_subdev_get_try_crop(sd, fh->pad, 0);
+
+	crop->left = OV5647_COLUMN_START_DEF;
+	crop->top = OV5647_ROW_START_DEF;
+	crop->width = OV5647_WINDOW_WIDTH_DEF;
+	crop->height = OV5647_WINDOW_HEIGHT_DEF;
+
+	format->code = MEDIA_BUS_FMT_SBGGR8_1X8;
+
+	format->width = OV5647_WINDOW_WIDTH_DEF;
+	format->height = OV5647_WINDOW_HEIGHT_DEF;
+	format->field = V4L2_FIELD_NONE;
+	format->colorspace = V4L2_COLORSPACE_SRGB;
+
+	return sensor_power(sd, true);
+}
+
+/**
+ * @short Open device
+ * @param[in] sd v4l2 subdev
+ * @param[in] fh v4l2 file handler
+ * @return Error code
+ */
+static int ov5647_close(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
+{
+	return sensor_power(sd, false);
+}
+
+/**
+ * @short Subdev internal operations registration
+ *
+ */
+static const struct v4l2_subdev_internal_ops ov5647_subdev_internal_ops = {
+	.registered = ov5647_registered,
+	.open = ov5647_open,
+	.close = ov5647_close,
+};
+
+/**
+ * @short Initialization routine - Entry point of the driver
+ * @param[in] client pointer to the i2c client structure
+ * @param[in] id pointer to the i2c device id structure
+ * @return 0 on success and a negative number on failure
+ */
+static int ov5647_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct device *dev = &client->dev;
+	struct ov5647 *sensor;
+	int ret;
+	struct v4l2_subdev *sd;
+
+	dev_info(&client->dev, "Installing OmniVision OV5647 camera driver\n");
+
+	sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
+	if (sensor == NULL)
+		return -ENOMEM;
+
+	/* get system clock (xclk) */
+	sensor->xclk = devm_clk_get(dev, "xclk");
+	if (IS_ERR(sensor->xclk)) {
+		dev_err(dev, "could not get xclk");
+		return PTR_ERR(sensor->xclk);
+	}
+
+	ret = of_property_read_u32(dev->of_node, "clock-frequency",
+				    &sensor->xclk_freq);
+	if (ret) {
+		dev_err(dev, "could not get xclk frequency\n");
+		return ret;
+	}
+
+	mutex_init(&sensor->lock);
+	sensor->dev = dev;
+
+	sd = &sensor->sd;
+	v4l2_i2c_subdev_init(sd, client, &subdev_ops);
+	sensor->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
+
+	sensor->pad.flags = MEDIA_PAD_FL_SOURCE;
+	sd->entity.function = MEDIA_ENT_F_CAM_SENSOR;
+	ret = media_entity_pads_init(&sd->entity, 1, &sensor->pad);
+	if (ret < 0)
+		goto mutex_remove;
+
+	ret = ov5647_detect(sd);
+	if (ret < 0)
+		goto error;
+
+	ret = v4l2_async_register_subdev(sd);
+	if (ret < 0)
+		goto error;
+
+	return 0;
+error:
+	media_entity_cleanup(&sd->entity);
+mutex_remove:
+	mutex_destroy(&sensor->lock);
+	return ret;
+}
+
+/**
+ * @short Exit routine - Exit point of the driver
+ * @param[in] client pointer to the i2c client structure
+ * @return 0 on success and a negative number on failure
+ */
+static int ov5647_remove(struct i2c_client *client)
+{
+	struct v4l2_subdev *sd = i2c_get_clientdata(client);
+	struct ov5647 *ov5647 = to_state(sd);
+
+	v4l2_async_unregister_subdev(&ov5647->sd);
+	media_entity_cleanup(&ov5647->sd.entity);
+	v4l2_device_unregister_subdev(sd);
+	mutex_destroy(&ov5647->lock);
+
+	return 0;
+}
+
+static const struct i2c_device_id ov5647_id[] = {
+	{ "ov5647", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, ov5647_id);
+
+#if IS_ENABLED(CONFIG_OF)
+static const struct of_device_id ov5647_of_match[] = {
+	{ .compatible = "ovti,ov5647" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, ov5647_of_match);
+#endif
+
+/**
+ * @short i2c driver structure
+ */
+static struct i2c_driver ov5647_driver = {
+	.driver = {
+		.of_match_table = of_match_ptr(ov5647_of_match),
+		.owner	= THIS_MODULE,
+		.name	= "ov5647",
+	},
+	.probe		= ov5647_probe,
+	.remove		= ov5647_remove,
+	.id_table	= ov5647_id,
+};
+
+module_i2c_driver(ov5647_driver);
+
+MODULE_AUTHOR("Ramiro Oliveira <roliveir@...opsys.com>");
+MODULE_DESCRIPTION("A low-level driver for OmniVision ov5647 sensors");
+MODULE_LICENSE("GPL v2");
-- 
2.11.0

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