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V4L/DVB (9790): soc-camera: pixel format negotiation - core support

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Allocate and fill a list of formats, supported by this specific
camera-host combination. Use it for format enumeration. Take care to stay
backwards-compatible.

Camera hosts rely on sensor formats available, as well as
host specific translations. We add a structure so that hosts
can define a translation table and use it for format check
and setup.

Signed-off-by: Guennadi Liakhovetski <[email protected]>
Signed-off-by: Robert Jarzmik <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Guennadi Liakhovetski 2008-12-01 09:45:27 -03:00 • committed by Mauro Carvalho Chehab
commit c2786ad271
2 changed files with 105 additions and 13 deletions
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25
include/media/soc_camera.h
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@ -41,6 +41,8 @@ struct soc_camera_device {
const struct soc_camera_data_format *current_fmt;
const struct soc_camera_data_format *formats;
int num_formats;
struct soc_camera_format_xlate *user_formats;
int num_user_formats;
struct module *owner;
void *host_priv; /* per-device host private data */
/* soc_camera.c private count. Only accessed with video_lock held */
@ -65,8 +67,10 @@ struct soc_camera_host_ops {
struct module *owner;
int (*add)(struct soc_camera_device *);
void (*remove)(struct soc_camera_device *);
int (*suspend)(struct soc_camera_device *, pm_message_t state);
int (*suspend)(struct soc_camera_device *, pm_message_t);
int (*resume)(struct soc_camera_device *);
int (*get_formats)(struct soc_camera_device *, int,
struct soc_camera_format_xlate *);
int (*set_fmt)(struct soc_camera_device *, __u32, struct v4l2_rect *);
int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
void (*init_videobuf)(struct videobuf_queue *,
@ -107,6 +111,8 @@ extern void soc_camera_video_stop(struct soc_camera_device *icd);
extern const struct soc_camera_data_format *soc_camera_format_by_fourcc(
struct soc_camera_device *icd, unsigned int fourcc);
extern const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
struct soc_camera_device *icd, unsigned int fourcc);
struct soc_camera_data_format {
const char *name;
@ -115,6 +121,23 @@ struct soc_camera_data_format {
enum v4l2_colorspace colorspace;
};
/**
* struct soc_camera_format_xlate - match between host and sensor formats
* @cam_fmt: sensor format provided by the sensor
* @host_fmt: host format after host translation from cam_fmt
* @buswidth: bus width for this format
*
* Host and sensor translation structure. Used in table of host and sensor
* formats matchings in soc_camera_device. A host can override the generic list
* generation by implementing get_formats(), and use it for format checks and
* format setup.
*/
struct soc_camera_format_xlate {
const struct soc_camera_data_format *cam_fmt;
const struct soc_camera_data_format *host_fmt;
unsigned char buswidth;
};
struct soc_camera_ops {
struct module *owner;
int (*probe)(struct soc_camera_device *);