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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: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Guennadi Liakhovetski 2008-12-18 11:34:20 -03:00 committed by Mauro Carvalho Chehab
parent 39bf372f60
commit a9bef518cd
1 changed files with 27 additions and 0 deletions
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27
include/media/soc_camera.h
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@ -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)
{