Re: [PATCHv6 11/14] ov2640: convert from soc-camera to a standard subdev sensor driver.

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On 29/03/17 15:42, Hugues FRUCHET wrote:
> Acked-by: Hugues Fruchet <hugues.fruchet@xxxxxx>
> 
> Tested successfully on STM324x9I-EVAL evaluation board embedding
> an OV2640 camera sensor.
> 
> I don't understand the comment around s_power op that has been dropped 
> (it is there in code), and no problem is observed doing several 
> open/close, tell me if I miss something.

Darn, I forgot to remove that comment in the commit log. It's a leftover from
an earlier version.

Regards,

	Hans

> 
> BR,
> Hugues.
> 
> On 03/28/2017 10:23 AM, Hans Verkuil wrote:
>> From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>>
>> Convert ov2640 to a standard subdev driver. The soc-camera driver no longer
>> uses this driver, so it can safely be converted.
>>
>> Note: the s_power op has been dropped: this never worked. When the last open()
>> is closed, then the power is turned off, and when it is opened again the power
>> is turned on again, but the old state isn't restored.
>>
>> Someone else can figure out in the future how to get this working correctly,
>> but I don't want to spend more time on this.
>>
>> Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
>> Acked-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
>> ---
>>  drivers/media/i2c/Kconfig                   | 11 ++++
>>  drivers/media/i2c/Makefile                  |  1 +
>>  drivers/media/i2c/{soc_camera => }/ov2640.c | 89 +++++------------------------
>>  drivers/media/i2c/soc_camera/Kconfig        |  6 --
>>  drivers/media/i2c/soc_camera/Makefile       |  1 -
>>  5 files changed, 27 insertions(+), 81 deletions(-)
>>  rename drivers/media/i2c/{soc_camera => }/ov2640.c (94%)
>>
>> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
>> index cee1dae6e014..db2c63f592c5 100644
>> --- a/drivers/media/i2c/Kconfig
>> +++ b/drivers/media/i2c/Kconfig
>> @@ -520,6 +520,17 @@ config VIDEO_APTINA_PLL
>>  config VIDEO_SMIAPP_PLL
>>  	tristate
>>
>> +config VIDEO_OV2640
>> +	tristate "OmniVision OV2640 sensor support"
>> +	depends on VIDEO_V4L2 && I2C && GPIOLIB
>> +	depends on MEDIA_CAMERA_SUPPORT
>> +	help
>> +	  This is a Video4Linux2 sensor-level driver for the OmniVision
>> +	  OV2640 camera.
>> +
>> +	  To compile this driver as a module, choose M here: the
>> +	  module will be called ov2640.
>> +
>>  config VIDEO_OV2659
>>  	tristate "OmniVision OV2659 sensor support"
>>  	depends on VIDEO_V4L2 && I2C
>> diff --git a/drivers/media/i2c/Makefile b/drivers/media/i2c/Makefile
>> index 5bc7bbeb5499..50af1e11c85a 100644
>> --- a/drivers/media/i2c/Makefile
>> +++ b/drivers/media/i2c/Makefile
>> @@ -57,6 +57,7 @@ obj-$(CONFIG_VIDEO_VP27SMPX) += vp27smpx.o
>>  obj-$(CONFIG_VIDEO_SONY_BTF_MPX) += sony-btf-mpx.o
>>  obj-$(CONFIG_VIDEO_UPD64031A) += upd64031a.o
>>  obj-$(CONFIG_VIDEO_UPD64083) += upd64083.o
>> +obj-$(CONFIG_VIDEO_OV2640) += ov2640.o
>>  obj-$(CONFIG_VIDEO_OV7640) += ov7640.o
>>  obj-$(CONFIG_VIDEO_OV7670) += ov7670.o
>>  obj-$(CONFIG_VIDEO_OV9650) += ov9650.o
>> diff --git a/drivers/media/i2c/soc_camera/ov2640.c b/drivers/media/i2c/ov2640.c
>> similarity index 94%
>> rename from drivers/media/i2c/soc_camera/ov2640.c
>> rename to drivers/media/i2c/ov2640.c
>> index b9a0069f5b33..83f88efbce69 100644
>> --- a/drivers/media/i2c/soc_camera/ov2640.c
>> +++ b/drivers/media/i2c/ov2640.c
>> @@ -24,8 +24,8 @@
>>  #include <linux/v4l2-mediabus.h>
>>  #include <linux/videodev2.h>
>>
>> -#include <media/soc_camera.h>
>>  #include <media/v4l2-clk.h>
>> +#include <media/v4l2-device.h>
>>  #include <media/v4l2-subdev.h>
>>  #include <media/v4l2-ctrls.h>
>>  #include <media/v4l2-image-sizes.h>
>> @@ -287,7 +287,6 @@ struct ov2640_priv {
>>  	struct v4l2_clk			*clk;
>>  	const struct ov2640_win_size	*win;
>>
>> -	struct soc_camera_subdev_desc	ssdd_dt;
>>  	struct gpio_desc *resetb_gpio;
>>  	struct gpio_desc *pwdn_gpio;
>>  };
>> @@ -677,13 +676,8 @@ static int ov2640_reset(struct i2c_client *client)
>>  }
>>
>>  /*
>> - * soc_camera_ops functions
>> + * functions
>>   */
>> -static int ov2640_s_stream(struct v4l2_subdev *sd, int enable)
>> -{
>> -	return 0;
>> -}
>> -
>>  static int ov2640_s_ctrl(struct v4l2_ctrl *ctrl)
>>  {
>>  	struct v4l2_subdev *sd =
>> @@ -744,10 +738,16 @@ static int ov2640_s_register(struct v4l2_subdev *sd,
>>  static int ov2640_s_power(struct v4l2_subdev *sd, int on)
>>  {
>>  	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> -	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
>>  	struct ov2640_priv *priv = to_ov2640(client);
>>
>> -	return soc_camera_set_power(&client->dev, ssdd, priv->clk, on);
>> +	gpiod_direction_output(priv->pwdn_gpio, !on);
>> +	if (on && priv->resetb_gpio) {
>> +		/* Active the resetb pin to perform a reset pulse */
>> +		gpiod_direction_output(priv->resetb_gpio, 1);
>> +		usleep_range(3000, 5000);
>> +		gpiod_direction_output(priv->resetb_gpio, 0);
>> +	}
>> +	return 0;
>>  }
>>
>>  /* Select the nearest higher resolution for capture */
>> @@ -994,26 +994,6 @@ static struct v4l2_subdev_core_ops ov2640_subdev_core_ops = {
>>  	.s_power	= ov2640_s_power,
>>  };
>>
>> -static int ov2640_g_mbus_config(struct v4l2_subdev *sd,
>> -				struct v4l2_mbus_config *cfg)
>> -{
>> -	struct i2c_client *client = v4l2_get_subdevdata(sd);
>> -	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
>> -
>> -	cfg->flags = V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_MASTER |
>> -		V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_HIGH |
>> -		V4L2_MBUS_DATA_ACTIVE_HIGH;
>> -	cfg->type = V4L2_MBUS_PARALLEL;
>> -	cfg->flags = soc_camera_apply_board_flags(ssdd, cfg);
>> -
>> -	return 0;
>> -}
>> -
>> -static struct v4l2_subdev_video_ops ov2640_subdev_video_ops = {
>> -	.s_stream	= ov2640_s_stream,
>> -	.g_mbus_config	= ov2640_g_mbus_config,
>> -};
>> -
>>  static const struct v4l2_subdev_pad_ops ov2640_subdev_pad_ops = {
>>  	.enum_mbus_code = ov2640_enum_mbus_code,
>>  	.get_selection	= ov2640_get_selection,
>> @@ -1023,40 +1003,9 @@ static const struct v4l2_subdev_pad_ops ov2640_subdev_pad_ops = {
>>
>>  static struct v4l2_subdev_ops ov2640_subdev_ops = {
>>  	.core	= &ov2640_subdev_core_ops,
>> -	.video	= &ov2640_subdev_video_ops,
>>  	.pad	= &ov2640_subdev_pad_ops,
>>  };
>>
>> -/* OF probe functions */
>> -static int ov2640_hw_power(struct device *dev, int on)
>> -{
>> -	struct i2c_client *client = to_i2c_client(dev);
>> -	struct ov2640_priv *priv = to_ov2640(client);
>> -
>> -	dev_dbg(&client->dev, "%s: %s the camera\n",
>> -			__func__, on ? "ENABLE" : "DISABLE");
>> -
>> -	if (priv->pwdn_gpio)
>> -		gpiod_direction_output(priv->pwdn_gpio, !on);
>> -
>> -	return 0;
>> -}
>> -
>> -static int ov2640_hw_reset(struct device *dev)
>> -{
>> -	struct i2c_client *client = to_i2c_client(dev);
>> -	struct ov2640_priv *priv = to_ov2640(client);
>> -
>> -	if (priv->resetb_gpio) {
>> -		/* Active the resetb pin to perform a reset pulse */
>> -		gpiod_direction_output(priv->resetb_gpio, 1);
>> -		usleep_range(3000, 5000);
>> -		gpiod_direction_output(priv->resetb_gpio, 0);
>> -	}
>> -
>> -	return 0;
>> -}
>> -
>>  static int ov2640_probe_dt(struct i2c_client *client,
>>  		struct ov2640_priv *priv)
>>  {
>> @@ -1076,11 +1025,6 @@ static int ov2640_probe_dt(struct i2c_client *client,
>>  	else if (IS_ERR(priv->pwdn_gpio))
>>  		return PTR_ERR(priv->pwdn_gpio);
>>
>> -	/* Initialize the soc_camera_subdev_desc */
>> -	priv->ssdd_dt.power = ov2640_hw_power;
>> -	priv->ssdd_dt.reset = ov2640_hw_reset;
>> -	client->dev.platform_data = &priv->ssdd_dt;
>> -
>>  	return 0;
>>  }
>>
>> @@ -1091,7 +1035,6 @@ static int ov2640_probe(struct i2c_client *client,
>>  			const struct i2c_device_id *did)
>>  {
>>  	struct ov2640_priv	*priv;
>> -	struct soc_camera_subdev_desc *ssdd = soc_camera_i2c_to_desc(client);
>>  	struct i2c_adapter	*adapter = to_i2c_adapter(client->dev.parent);
>>  	int			ret;
>>
>> @@ -1112,17 +1055,15 @@ static int ov2640_probe(struct i2c_client *client,
>>  	if (IS_ERR(priv->clk))
>>  		return -EPROBE_DEFER;
>>
>> -	if (!ssdd && !client->dev.of_node) {
>> +	if (!client->dev.of_node) {
>>  		dev_err(&client->dev, "Missing platform_data for driver\n");
>>  		ret = -EINVAL;
>>  		goto err_clk;
>>  	}
>>
>> -	if (!ssdd) {
>> -		ret = ov2640_probe_dt(client, priv);
>> -		if (ret)
>> -			goto err_clk;
>> -	}
>> +	ret = ov2640_probe_dt(client, priv);
>> +	if (ret)
>> +		goto err_clk;
>>
>>  	v4l2_i2c_subdev_init(&priv->subdev, client, &ov2640_subdev_ops);
>>  	v4l2_ctrl_handler_init(&priv->hdl, 2);
>> @@ -1190,6 +1131,6 @@ static struct i2c_driver ov2640_i2c_driver = {
>>
>>  module_i2c_driver(ov2640_i2c_driver);
>>
>> -MODULE_DESCRIPTION("SoC Camera driver for Omni Vision 2640 sensor");
>> +MODULE_DESCRIPTION("Driver for Omni Vision 2640 sensor");
>>  MODULE_AUTHOR("Alberto Panizzo");
>>  MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/media/i2c/soc_camera/Kconfig b/drivers/media/i2c/soc_camera/Kconfig
>> index 7704bcf5cc25..96859f37cb1c 100644
>> --- a/drivers/media/i2c/soc_camera/Kconfig
>> +++ b/drivers/media/i2c/soc_camera/Kconfig
>> @@ -41,12 +41,6 @@ config SOC_CAMERA_MT9V022
>>  	help
>>  	  This driver supports MT9V022 cameras from Micron
>>
>> -config SOC_CAMERA_OV2640
>> -	tristate "ov2640 camera support"
>> -	depends on SOC_CAMERA && I2C
>> -	help
>> -	  This is a ov2640 camera driver
>> -
>>  config SOC_CAMERA_OV5642
>>  	tristate "ov5642 camera support"
>>  	depends on SOC_CAMERA && I2C
>> diff --git a/drivers/media/i2c/soc_camera/Makefile b/drivers/media/i2c/soc_camera/Makefile
>> index 6f994f9353a0..974bdb721dbe 100644
>> --- a/drivers/media/i2c/soc_camera/Makefile
>> +++ b/drivers/media/i2c/soc_camera/Makefile
>> @@ -3,7 +3,6 @@ obj-$(CONFIG_SOC_CAMERA_MT9M001)	+= mt9m001.o
>>  obj-$(CONFIG_SOC_CAMERA_MT9T031)	+= mt9t031.o
>>  obj-$(CONFIG_SOC_CAMERA_MT9T112)	+= mt9t112.o
>>  obj-$(CONFIG_SOC_CAMERA_MT9V022)	+= mt9v022.o
>> -obj-$(CONFIG_SOC_CAMERA_OV2640)		+= ov2640.o
>>  obj-$(CONFIG_SOC_CAMERA_OV5642)		+= ov5642.o
>>  obj-$(CONFIG_SOC_CAMERA_OV6650)		+= ov6650.o
>>  obj-$(CONFIG_SOC_CAMERA_OV772X)		+= ov772x.o
>>




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