Re: [PATCH v5 2/2] Add support for OV5647 sensor

From: Sakari Ailus
Date: Wed Dec 07 2016 - 18:09:32 EST

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In reply to: Ramiro Oliveira: "[PATCH v5 2/2] Add support for OV5647 sensor"
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Hi Ramiro,

On Mon, Dec 05, 2016 at 05:36:34PM +0000, Ramiro Oliveira wrote:
> Add support for OV5647 sensor.
>
> Modes supported:
> - 640x480 RAW 8
>
> Signed-off-by: Ramiro Oliveira <roliveir@xxxxxxxxxxxx>
> ---
> MAINTAINERS | 7 +
> drivers/media/i2c/Kconfig | 12 +
> drivers/media/i2c/Makefile | 1 +
> drivers/media/i2c/ov5647.c | 866 +++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 886 insertions(+)
> create mode 100644 drivers/media/i2c/ov5647.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 52cc077..72e828a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8923,6 +8923,13 @@ 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 b31fa6f..c1b78e5 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

How does this driver depend on OF, other than matching the compatible
string?

> + 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 92773b2..0d9014c 100644
> --- a/drivers/media/i2c/Makefile
> +++ b/drivers/media/i2c/Makefile
> @@ -82,3 +82,4 @@ 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 0000000..2aae806
> --- /dev/null
> +++ b/drivers/media/i2c/ov5647.c
> @@ -0,0 +1,866 @@
> +/*
> + * 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/init.h>
> +#include <linux/module.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/delay.h>
> +#include <linux/videodev2.h>
> +#include <media/v4l2-device.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-mediabus.h>
> +#include <media/v4l2-image-sizes.h>
> +#include <media/v4l2-of.h>
> +#include <linux/io.h>

Alphabetical order, please.

> +
> +#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 sensor_win_size {
> + int width;
> + int height;
> + unsigned int hoffset;
> + unsigned int voffset;
> + unsigned int hts;
> + unsigned int vts;
> + unsigned int pclk;
> + unsigned int mipi_bps;
> + unsigned int fps_fixed;
> + unsigned int bin_factor;
> + unsigned int intg_min;
> + unsigned int intg_max;
> + void *regs;
> + int regs_size;
> + int (*set_size)(struct v4l2_subdev *sd);
> +};
> +
> +
> +struct ov5647 {
> + struct device *dev;
> + struct v4l2_subdev sd;
> + struct media_pad pad;
> + struct mutex lock;
> + struct v4l2_mbus_framefmt format;
> + struct sensor_format_struct *fmt;
> + unsigned int width;
> + unsigned int height;
> + unsigned int capture_mode;
> + int hue;

At least capture_mode and hue are unused. Please remove unused fields.

> + struct v4l2_fract tpf;
> + struct sensor_win_size *current_wins;
> +};
> +
> +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[] = {

Does this list expect a certain external clock frequency? If it does, should
you check that the actual frequency matches with the expectation?

> + {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},
> +};
> +
> +struct sensor_format_struct;
> +
> +/**
> + * @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 Store information about the video data format.
> + */
> +static struct sensor_format_struct {
> + u8 *desc;
> + u32 mbus_code;
> + struct regval_list *regs;
> + int regs_size;
> + int bpp;

At least desc and bpp are unused.

> +} sensor_formats[] = {
> + {
> + .desc = "Raw RGB Bayer",
> + .mbus_code = MEDIA_BUS_FMT_SBGGR8_1X8,
> + .regs = ov5647_640x480,
> + .regs_size = ARRAY_SIZE(ov5647_640x480),
> + .bpp = 1
> + },
> +};
> +#define N_FMTS ARRAY_SIZE(sensor_formats)
> +
> +/* ----------------------------------------------------------------------- */
> +
> +/**
> + * @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) {
> + dev_dbg(&client->dev, "OV5647 power on\n");
> +
> + ret = ov5647_write_array(sd, sensor_oe_enable_regs,
> + ARRAY_SIZE(sensor_oe_enable_regs));
> +
> + ret = __sensor_init(sd);
> +
> + if (ret < 0)
> + dev_err(&client->dev,
> + "Camera not available, check Power\n");
> + } else {
> + 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");
> +
> + }
> +
> + 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,

The s_power() op will be called by the bridge (ISP) driver as well. You
should expect that it may be enabled more than once before being disabled
equal number of times.

> +#ifdef CONFIG_VIDEO_ADV_DEBUG
> + .g_register = sensor_get_register,
> + .s_register = sensor_set_register,
> +#endif
> +};
> +
> +/* ----------------------------------------------------------------------- */
> +
> +
> +
> +/**
> + * @short Enumerate available image formats
> + * @param[in] sd v4l2 subdev
> + * @param[in] index index
> + * @param[in] code MBUS Pixel code
> + * @return Error code
> + */
> +static int sensor_enum_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_mbus_code_enum *code)
> +{
> + if (code->pad || code->index >= N_FMTS)
> + return -EINVAL;
> +
> + code->code = sensor_formats[code->index].mbus_code;
> + return 0;
> +}
> +
> +/**
> + * @short Try frame format internal function
> + * @param[in] sd v4l2 subdev
> + * @param[in] fmt frame format
> + * @return Error code
> + */
> +static int sensor_try_fmt_internal(struct v4l2_subdev *sd,
> + struct v4l2_mbus_framefmt *fmt, struct sensor_format_struct **ret_fmt,
> + struct sensor_win_size **ret_wsize)
> +{
> + int index;
> +
> + for (index = 0; index < N_FMTS; index++)
> + if (sensor_formats[index].mbus_code == fmt->code)
> + break;
> +
> + if (index >= N_FMTS)
> + return -EINVAL;
> +
> + if (ret_fmt != NULL)
> + *ret_fmt = sensor_formats + index;
> +
> + fmt->field = V4L2_FIELD_NONE;
> +
> + return 0;
> +}
> +
> +/**
> + * @short Set frame format
> + * @param[in] sd v4l2 subdev
> + * @param[in] fmt frame format
> + * @return Error code
> + */
> +static int sensor_s_fmt(struct v4l2_subdev *sd,
> + struct v4l2_subdev_pad_config *cfg,
> + struct v4l2_subdev_format *fmt)
> +{
> + int ret;
> + struct sensor_format_struct *sensor_fmt;
> + struct sensor_win_size *wsize;
> + struct ov5647 *info = to_state(sd);
> +
> + ov5647_write_array(sd, sensor_oe_disable_regs,
> + ARRAY_SIZE(sensor_oe_disable_regs));

Should you check the error code here?

> +
> + ret = sensor_try_fmt_internal(sd, &fmt->format,
> + &sensor_fmt, &wsize);

Do you set wsize somewhere?

> + if (ret)
> + return ret;
> +
> + ov5647_write_array(sd, sensor_fmt->regs, sensor_fmt->regs_size);

And here.

> +
> + ret = 0;

ret was already zero.

> +
> + if (wsize->regs)
> + ov5647_write_array(sd, wsize->regs, wsize->regs_size);
> +
> + if (wsize->set_size)
> + wsize->set_size(sd);
> +
> + info->fmt = sensor_fmt;
> + info->width = wsize->width;
> + info->height = wsize->height;
> +
> + ov5647_write_array(sd, sensor_oe_enable_regs,
> + ARRAY_SIZE(sensor_oe_enable_regs));
> +
> + return 0;
> +}
> +
> +/**
> + * @short Set stream parameters
> + * @param[in] sd v4l2 subdev
> + * @param[in] parms stream parameters
> + * @return Error code
> + */
> +static int sensor_s_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
> +{
> + struct v4l2_captureparm *cp = &parms->parm.capture;
> + struct ov5647 *info = to_state(sd);
> +
> + if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + if (info->tpf.numerator == 0)
> + return -EINVAL;
> +
> + info->capture_mode = cp->capturemode;
> +
> + return 0;
> +}
> +
> +/**
> + * @short Get stream parameters
> + * @param[in] sd v4l2 subdev
> + * @param[in] parms stream parameters
> + * @return Error code
> + */
> +static int sensor_g_parm(struct v4l2_subdev *sd, struct v4l2_streamparm *parms)
> +{
> + struct v4l2_captureparm *cp = &parms->parm.capture;
> + struct ov5647 *info = to_state(sd);
> +
> + if (parms->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
> + return -EINVAL;
> +
> + memset(cp, 0, sizeof(struct v4l2_captureparm));
> + cp->capability = V4L2_CAP_TIMEPERFRAME;
> + cp->capturemode = info->capture_mode;
> +
> + return 0;
> +}
> +
> +/**
> + * @short Subdev video operations registration
> + *
> + */
> +static const struct v4l2_subdev_video_ops sensor_video_ops = {
> + .s_parm = sensor_s_parm,
> + .g_parm = sensor_g_parm,

Please use the g/s_frame_interval() instead. That's what sub-device drivers
generally use for the purpose.

> +};
> +
> +/* ----------------------------------------------------------------------- */
> +
> +/**
> + * @short Subdev operations registration
> + *
> + */
> +static const struct v4l2_subdev_ops subdev_ops = {
> + .core = &sensor_core_ops,
> + .video = &sensor_video_ops,
> +};
> +
> +/* -----------------------------------------------------------------------------
> + * V4L2 subdev internal operations
> + */
> +
> +/**
> + * @short Detect camera version and model
> + * @param[in] sd v4l2 subdev
> + * @return Error code
> + */
> +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)
> +{
> + struct i2c_client *client = v4l2_get_subdevdata(sd);
> +
> + dev_info(&client->dev, "OV5647 detected at address 0x%02x\n",
> + client->addr);

I might omit this. If there's a need to debug this then the information
should be printed by the framework instead using debug level messages.

> +
> + 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 = 0;

No need to initialise ret here.

> + 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;
> +
> + 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
e-mail: sakari.ailus@xxxxxx XMPP: sailus@xxxxxxxxxxxxxx

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