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linux/include/media/soc_camera.h
Guennadi Liakhovetski 0fd327bd0d V4L/DVB (11705): soc-camera: prepare for the platform driver conversion 
Add a platform driver to soc_camera.c. This way we preserve backwards
compatibility with existing platforms and can start converting them one by one
to the new platform-device soc-camera interface.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-06-16 18:20:54 -03:00

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/*
* camera image capture (abstract) bus driver header
*
* Copyright (C) 2006, Sascha Hauer, Pengutronix
* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef SOC_CAMERA_H
#define SOC_CAMERA_H
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/videodev2.h>
#include <media/videobuf-core.h>
struct soc_camera_device {
struct list_head list;
struct device dev;
struct device *control;
unsigned short width; /* Current window */
unsigned short height; /* sizes */
unsigned short x_min; /* Camera capabilities */
unsigned short y_min;
unsigned short x_current; /* Current window location */
unsigned short y_current;
unsigned short width_min;
unsigned short width_max;
unsigned short height_min;
unsigned short height_max;
unsigned short y_skip_top; /* Lines to skip at the top */
unsigned short gain;
unsigned short exposure;
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;
const struct soc_camera_data_format *formats;
int num_formats;
struct soc_camera_format_xlate *user_formats;
int num_user_formats;
enum v4l2_field field; /* Preserve field over close() */
struct module *owner;
void *host_priv; /* Per-device host private data */
/* soc_camera.c private count. Only accessed with .video_lock held */
int use_count;
struct mutex video_lock; /* Protects device data */
};
struct soc_camera_file {
struct soc_camera_device *icd;
struct videobuf_queue vb_vidq;
};
struct soc_camera_host {
struct list_head list;
struct device *dev;
unsigned char nr; /* Host number */
void *priv;
const char *drv_name;
struct soc_camera_host_ops *ops;
};
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);
int (*resume)(struct soc_camera_device *);
int (*get_formats)(struct soc_camera_device *, int,
struct soc_camera_format_xlate *);
int (*set_crop)(struct soc_camera_device *, struct v4l2_rect *);
int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
void (*init_videobuf)(struct videobuf_queue *,
struct soc_camera_device *);
int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
int (*set_bus_param)(struct soc_camera_device *, __u32);
unsigned int (*poll)(struct file *, poll_table *);
};
#define SOCAM_SENSOR_INVERT_PCLK (1 << 0)
#define SOCAM_SENSOR_INVERT_MCLK (1 << 1)
#define SOCAM_SENSOR_INVERT_HSYNC (1 << 2)
#define SOCAM_SENSOR_INVERT_VSYNC (1 << 3)
#define SOCAM_SENSOR_INVERT_DATA (1 << 4)
struct i2c_board_info;
struct soc_camera_link {
/* Camera bus id, used to match a camera and a bus */
int bus_id;
/* Per camera SOCAM_SENSOR_* bus flags */
unsigned long flags;
int i2c_adapter_id;
struct i2c_board_info *board_info;
const char *module_name;
/* Optional callbacks to power on or off and reset the sensor */
int (*power)(struct device *, int);
int (*reset)(struct device *);
/*
* some platforms may support different data widths than the sensors
* native ones due to different data line routing. Let the board code
* overwrite the width flags.
*/
int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
unsigned long (*query_bus_param)(struct soc_camera_link *);
void (*free_bus)(struct soc_camera_link *);
};
static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
{
return container_of(dev, struct soc_camera_device, dev);
}
static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
{
return dev_get_drvdata(dev);
}
extern int soc_camera_host_register(struct soc_camera_host *ici);
extern void soc_camera_host_unregister(struct soc_camera_host *ici);
extern int soc_camera_device_register(struct soc_camera_device *icd);
extern void soc_camera_device_unregister(struct soc_camera_device *icd);
extern int soc_camera_video_start(struct soc_camera_device *icd);
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;
unsigned int depth;
__u32 fourcc;
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 *);
void (*remove)(struct soc_camera_device *);
int (*suspend)(struct soc_camera_device *, pm_message_t state);
int (*resume)(struct soc_camera_device *);
int (*init)(struct soc_camera_device *);
int (*release)(struct soc_camera_device *);
int (*start_capture)(struct soc_camera_device *);
int (*stop_capture)(struct soc_camera_device *);
int (*set_crop)(struct soc_camera_device *, struct v4l2_rect *);
int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
unsigned long (*query_bus_param)(struct soc_camera_device *);
int (*set_bus_param)(struct soc_camera_device *, unsigned long);
int (*get_chip_id)(struct soc_camera_device *,
struct v4l2_dbg_chip_ident *);
int (*set_std)(struct soc_camera_device *, v4l2_std_id *);
int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
#ifdef CONFIG_VIDEO_ADV_DEBUG
int (*get_register)(struct soc_camera_device *, struct v4l2_dbg_register *);
int (*set_register)(struct soc_camera_device *, struct v4l2_dbg_register *);
#endif
int (*get_control)(struct soc_camera_device *, struct v4l2_control *);
int (*set_control)(struct soc_camera_device *, struct v4l2_control *);
const struct v4l2_queryctrl *controls;
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)
{
int i;
for (i = 0; i < ops->num_controls; i++)
if (ops->controls[i].id == id)
return &ops->controls[i];
return NULL;
}
#define SOCAM_MASTER (1 << 0)
#define SOCAM_SLAVE (1 << 1)
#define SOCAM_HSYNC_ACTIVE_HIGH (1 << 2)
#define SOCAM_HSYNC_ACTIVE_LOW (1 << 3)
#define SOCAM_VSYNC_ACTIVE_HIGH (1 << 4)
#define SOCAM_VSYNC_ACTIVE_LOW (1 << 5)
#define SOCAM_DATAWIDTH_4 (1 << 6)
#define SOCAM_DATAWIDTH_8 (1 << 7)
#define SOCAM_DATAWIDTH_9 (1 << 8)
#define SOCAM_DATAWIDTH_10 (1 << 9)
#define SOCAM_DATAWIDTH_15 (1 << 10)
#define SOCAM_DATAWIDTH_16 (1 << 11)
#define SOCAM_PCLK_SAMPLE_RISING (1 << 12)
#define SOCAM_PCLK_SAMPLE_FALLING (1 << 13)
#define SOCAM_DATA_ACTIVE_HIGH (1 << 14)
#define SOCAM_DATA_ACTIVE_LOW (1 << 15)
#define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
static inline unsigned long soc_camera_bus_param_compatible(
unsigned long camera_flags, unsigned long bus_flags)
{
unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
common_flags = camera_flags & bus_flags;
hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
common_flags;
}
extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
unsigned long flags);
#endif
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