Date:   Fri, 3 Feb 2017 22:17:30 +0200
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, CARLOS.PALMINHA@...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>,
        Steve Longerbeam <slongerbeam@...il.com>
Subject: Re: [PATCH RESEND v7 2/2] Add support for OV5647 sensor.

Hi Ramiro,

Thanks for the update!

Please see some comments below... some streaming and hardware control
related matters I missed earlier.

On Fri, Feb 03, 2017 at 06:18:33PM +0000, Ramiro Oliveira wrote:
> 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);
> +

Your sensor configuration appears to begin with software reset, so I
suppose whatever you do between powering the sensor on and that will be
lost.

> +	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)) {

Can this ever happen? Streaming start is at the end of the register list.

> +		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,

You should implement s_stream() in video ops to control the streaming state.

I don't know about this particular sensor, but on SMIA compliant sensors
the SW standby means streaming is disabled. There seem to be additional
registers as well; my educated guess is that writing all those to control
streaming would be the right thing to do.

The CSI-2 bus initialisation could fail if you start streaming right away
when the sensor is powered on.

> +};
> +
> +/**
> + * @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");

-- 
Kind regards,

Sakari Ailus
sakari.ailus@...ux.intel.com

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