Re: [PATCH RESEND v7 2/2] Add support for OV5647 sensor.

From: Sakari Ailus
Date: Fri Feb 03 2017 - 15:17:58 EST

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In reply to: Ramiro Oliveira: "[PATCH RESEND v7 2/2] Add support for OV5647 sensor."
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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@xxxxxxxxxxxx>
> Acked-by: Pavel Machek <pavel@xxxxxx>
> ---
> 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@xxxxxxxxxxxx>
> S: Maintained
> F: drivers/char/pcmcia/cm4040_cs.*
>
> +OMNIVISION OV5647 SENSOR DRIVER
> +M: Ramiro Oliveira <roliveir@xxxxxxxxxxxx>
> +L: linux-media@xxxxxxxxxxxxxxx
> +T: git git://linuxtv.org/media_tree.git
> +S: Maintained
> +F: drivers/media/i2c/ov5647.c
> +
> OMNIVISION OV7670 SENSOR DRIVER
> M: Jonathan Corbet <corbet@xxxxxxx>
> L: linux-media@xxxxxxxxxxxxxxx
> 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@xxxxxxxxxxx>
> + *
> + * Based on Omnivision OV7670 Camera Driver
> + * Copyright (C) 2006-7 Jonathan Corbet <corbet@xxxxxxx>
> + *
> + * 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@xxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("A low-level driver for OmniVision ov5647 sensors");
> +MODULE_LICENSE("GPL v2");

--
Kind regards,

Sakari Ailus
sakari.ailus@xxxxxxxxxxxxxxx

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