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Commit a9bef518 authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Mauro Carvalho Chehab
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V4L/DVB (10074): soc-camera: add camera sense data 



Add a struct soc_camera_sense, that can be used by camera host drivers to
request additional information from a camera driver, for example, when
changing data format. This struct can be extended in the future, its first use
is to request the camera driver whether the pixel-clock frequency has changed.

Tested-by: default avatarRobert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 39bf372f

include/media/soc_camera.h

+27 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ struct soc_camera_device { 
	unsigned char iface;		/* Host number */

	unsigned char devnum;		/* Device number per host */

	unsigned char buswidth;		/* See comment in .c */

	struct soc_camera_sense *sense;	/* See comment in struct definition */

	struct soc_camera_ops *ops;

	struct video_device *vdev;

	const struct soc_camera_data_format *current_fmt;
@@ -172,6 +173,32 @@ struct soc_camera_ops { 
	int num_controls;

};



#define SOCAM_SENSE_PCLK_CHANGED	(1 << 0)



/**

 * This struct can be attached to struct soc_camera_device by the host driver

 * to request sense from the camera, for example, when calling .set_fmt(). The

 * host then can check which flags are set and verify respective values if any.

 * For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has

 * changed during this operation. After completion the host should detach sense.

 *

 * @flags		ored SOCAM_SENSE_* flags

 * @master_clock	if the host wants to be informed about pixel-clock

 *			change, it better set master_clock.

 * @pixel_clock_max	maximum pixel clock frequency supported by the host,

 *			camera is not allowed to exceed this.

 * @pixel_clock		if the camera driver changed pixel clock during this

 *			operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses

 *			master_clock to calculate the new pixel-clock and

 *			sets this field.

 */

struct soc_camera_sense {

	unsigned long flags;

	unsigned long master_clock;

	unsigned long pixel_clock_max;

	unsigned long pixel_clock;

};



static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(

	struct soc_camera_ops *ops, int id)

{