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

From: Ramiro Oliveira
Date: Mon Dec 12 2016 - 06:39:33 EST

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Hi Sakari

On 12/7/2016 11:01 PM, Sakari Ailus wrote:
> 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?
>

It doesn't, should I proceed diferently?

>> + 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?
>

Yes. But like I said in the DT patch the external clock has a fixed frequency. I
can add a check if you thinks it's better.

>> + {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.
>

Should I add an IF check to verify if the sensor is powered on before running
the power on/off routine.

>> +#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");
>

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