Message-ID: <28e7db42-c324-667d-4d76-ad6dc02f0d3b@synopsys.com>
Date:   Tue, 21 Feb 2017 14:49:12 +0000
From:   Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
To:     Sakari Ailus <sakari.ailus@....fi>,
        Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <vladimir_zapolskiy@...tor.com>,
        <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>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        Pali Rohár <pali.rohar@...il.com>,
        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: Re: [PATCH v9 2/2] Add support for OV5647 sensor.

Hi Sakari,

Thank you for your feedback.

On 2/21/2017 12:09 PM, Sakari Ailus wrote:
> Hi Ramiro,
> 
> A few minor comments below.
> 
> On Fri, Feb 17, 2017 at 01:14:16PM +0000, Ramiro Oliveira wrote:
>> The OV5647 sensor from Omnivision supports up to 2592x1944 @ 15 fps, RAW 8
>> and RAW 10 output formats, and MIPI CSI-2 interface.
>>
>> The driver adds support for 640x480 RAW 8.
>>
>> Signed-off-by: Ramiro Oliveira <roliveir@...opsys.com>
>> ---
>>  MAINTAINERS                |   7 +
>>  drivers/media/i2c/Kconfig  |  11 +
>>  drivers/media/i2c/Makefile |   1 +
>>  drivers/media/i2c/ov5647.c | 638 +++++++++++++++++++++++++++++++++++++++++++++
>>  4 files changed, 657 insertions(+)
>>  create mode 100644 drivers/media/i2c/ov5647.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 8e7e8d7855ee..7bbca271acc8 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -9109,6 +9109,13 @@ 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..8435b99f38bc 100644
>> --- a/drivers/media/i2c/Kconfig
>> +++ b/drivers/media/i2c/Kconfig
>> @@ -531,6 +531,17 @@ 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 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..34e620fabbaf
>> --- /dev/null
>> +++ b/drivers/media/i2c/ov5647.c
>> @@ -0,0 +1,638 @@
>> +/*
>> + * 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>
> 
> You don't seem to implement any controls.
> 
> The sensor likely supports exposure time (and maybe also gain) the user
> might want to control. Is there an intent to add that? Otherwise the header
> should be removed.
> 

I plan to add them in the future but for now I think I'll just remove the header.

>> +#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 ov5647 {
>> +	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},
>> +};
>> +
>> +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 < 0)
>> +		dev_dbg(&client->dev, "%s: i2c write error, reg: %x\n",
>> +				__func__, reg);
>> +
>> +	return ret;
>> +}
>> +
>> +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 < 0) {
>> +		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
>> +			__func__, reg);
>> +		return ret;
>> +	}
>> +
>> +	ret = i2c_master_recv(client, val, 1);
>> +	if (ret < 0)
>> +		dev_dbg(&client->dev, "%s: i2c read error, reg: %x\n",
>> +				__func__, reg);
>> +
>> +	return ret;
>> +
>> +}
>> +
>> +static int ov5647_write_array(struct v4l2_subdev *sd,
>> +				struct regval_list *regs, int array_size)
>> +{
>> +	int i = 0, ret;
>> +
>> +	for (i = 0; i < array_size; i++) {
>> +		ret = ov5647_write(sd, regs[i].addr, regs[i].data);
>> +		if (ret < 0)
>> +			return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int ov5647_set_virtual_channel(struct v4l2_subdev *sd, int channel)
>> +{
>> +	u8 channel_id;
>> +	int ret;
>> +
>> +	ret = ov5647_read(sd, 0x4814, &channel_id);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	channel_id &= ~(3 << 6);
>> +	return ov5647_write(sd, 0x4814, channel_id | (channel << 6));
>> +}
>> +
>> +static int 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");
>> +
>> +	return ov5647_write(sd, 0x300D, 0x00);
>> +}
>> +
>> +static int 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");
>> +
>> +	return ov5647_write(sd, 0x300D, 0x01);
>> +}
>> +
>> +static int set_sw_standby(struct v4l2_subdev *sd, bool standby)
>> +{
>> +	int ret;
>> +	u8 rdval;
>> +
>> +	ret = ov5647_read(sd, 0x0100, &rdval);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (standby)
>> +		rdval &= ~0x01;
>> +	else
>> +		rdval |= 0x01;
>> +
>> +	return ov5647_write(sd, 0x0100, rdval);
>> +}
>> +
>> +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;
>> +
>> +	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;
>> +	}
>> +
>> +	ret = ov5647_set_virtual_channel(sd, 0);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	ret = ov5647_read(sd, 0x0100, &resetval);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (!(resetval & 0x01)) {
>> +		dev_err(&client->dev, "Device was in SW standby");
>> +		ret = ov5647_write(sd, 0x0100, 0x01);
>> +		if (ret < 0)
>> +			return ret;
>> +	}
>> +
>> +	return ov5647_write(sd, 0x4800, 0x04);
>> +}
>> +
>> +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;
> 
> You can assign in variable declaration.
> 

Yes, you're right.

>> +	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(&client->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
>> +static int sensor_get_register(struct v4l2_subdev *sd,
>> +				struct v4l2_dbg_register *reg)
>> +{
>> +	u8 val;
>> +	int ret;
>> +
>> +	ret = ov5647_read(sd, reg->reg & 0xff, &val);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	reg->val = val;
>> +	reg->size = 1;
>> +
>> +	return 0;
>> +}
>> +
>> +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 subdev_core_ops = {
>> +	.s_power		= sensor_power,
>> +#ifdef CONFIG_VIDEO_ADV_DEBUG
>> +	.g_register		= sensor_get_register,
>> +	.s_register		= sensor_set_register,
>> +#endif
>> +};
>> +
>> +static int s_stream(struct v4l2_subdev *sd, int enable)
>> +{
>> +	if (enable)
>> +		return ov5647_stream_on(sd);
>> +	else
>> +		return ov5647_stream_off(sd);
>> +}
>> +
>> +static const struct v4l2_subdev_video_ops subdev_video_ops = {
>> +	.s_stream =		s_stream,
>> +};
>> +
>> +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		= &subdev_core_ops,
>> +	.video		= &subdev_video_ops,
>> +	.pad		= &subdev_pad_ops,
>> +};
>> +
>> +static int ov5647_detect(struct v4l2_subdev *sd)
>> +{
>> +	u8 read;
>> +	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, &read);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (read != 0x56) {
>> +		dev_err(&client->dev, "Wrong model version detected");
> 
> You might want to tell whether it's high or low ID register that fails the
> check. And possibly the bad value. Up to you.
> 

I'll change the message and print the value that was read.

>> +		return -ENODEV;
>> +	}
>> +
>> +	ret = ov5647_read(sd, OV5647_REG_CHIPID_L, &read);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	if (read != 0x47) {
>> +		dev_err(&client->dev, "Wrong model version detected");
>> +		return -ENODEV;
>> +	}
>> +
>> +	return ov5647_write(sd, OV5647_SW_RESET, 0x00);
>> +}
>> +
>> +static int ov5647_registered(struct v4l2_subdev *sd)
>> +{
>> +	return 0;
>> +}
> 
> The registered() callback is optional, i.e. you can drop an empty callback.
> 

This is legacy code I was keeping in order to do something in the future with
the registered() callback, but I'll remove it.

>> +
>> +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);
>> +}
>> +
>> +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,
>> +};
>> +
>> +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;
>> +
>> +	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);
>> +	}
>> +
>> +	sensor->xclk_freq = clk_get_rate(sensor->xclk);
>> +	if (sensor->xclk_freq != 25000000) {
>> +		dev_err(dev, "Unsupported clock frequency: %u\n",
>> +			sensor->xclk_freq);
>> +		return -EINVAL;
>> +	}
>> +
>> +	mutex_init(&sensor->lock);
>> +
>> +	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;
>> +
>> +	dev_dbg(&client->dev, "OmniVision OV5647 camera driver probed\n");
>> +	return 0;
>> +error:
>> +	media_entity_cleanup(&sd->entity);
>> +mutex_remove:
>> +	mutex_destroy(&sensor->lock);
>> +	return ret;
>> +}
>> +
>> +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
>> +
>> +static struct i2c_driver ov5647_driver = {
>> +	.driver = {
>> +		.of_match_table = of_match_ptr(ov5647_of_match),
>> +		.name	= SENSOR_NAME,
>> +	},
>> +	.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");
> 

-- 
Best Regards

Ramiro Oliveira
Ramiro.Oliveira@...opsys.com

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