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This driver provides an interface between platform-specific camera busses and camera devices. It should be used if the camera is connected not over a "proper" bus like PCI or USB, but over a special bus, like, for example, the Quick Capture interface on PXA270 SoCs. Later it should also be used for i.MX31 SoCs from Freescale. It can handle multiple cameras and / or multiple busses, which can be used, e.g., in stereo-vision applications. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
148 lines
4.5 KiB
C
148 lines
4.5 KiB
C
/*
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* camera image capture (abstract) bus driver header
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*
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* Copyright (C) 2006, Sascha Hauer, Pengutronix
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* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef SOC_CAMERA_H
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#define SOC_CAMERA_H
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#include <linux/videodev2.h>
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#include <media/videobuf-dma-sg.h>
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struct soc_camera_device {
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struct list_head list;
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struct device dev;
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struct device *control;
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unsigned short width; /* Current window */
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unsigned short height; /* sizes */
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unsigned short x_min; /* Camera capabilities */
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unsigned short y_min;
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unsigned short x_current; /* Current window location */
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unsigned short y_current;
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unsigned short width_min;
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unsigned short width_max;
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unsigned short height_min;
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unsigned short height_max;
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unsigned short y_skip_top; /* Lines to skip at the top */
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unsigned short gain;
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unsigned short exposure;
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unsigned char iface; /* Host number */
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unsigned char devnum; /* Device number per host */
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unsigned char cached_datawidth; /* See comment in .c */
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struct soc_camera_ops *ops;
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struct video_device *vdev;
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const struct soc_camera_data_format *current_fmt;
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int (*probe)(struct soc_camera_device *icd);
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void (*remove)(struct soc_camera_device *icd);
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struct module *owner;
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};
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struct soc_camera_file {
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struct soc_camera_device *icd;
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struct videobuf_queue vb_vidq;
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};
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struct soc_camera_host {
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struct list_head list;
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struct device dev;
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unsigned char nr; /* Host number */
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size_t msize;
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struct videobuf_queue_ops *vbq_ops;
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struct module *owner;
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void *priv;
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char *drv_name;
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int (*add)(struct soc_camera_device *);
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void (*remove)(struct soc_camera_device *);
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int (*set_capture_format)(struct soc_camera_device *, __u32,
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struct v4l2_rect *);
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int (*try_fmt_cap)(struct soc_camera_host *, struct v4l2_format *);
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int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
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int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
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unsigned int (*poll)(struct file *, poll_table *);
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};
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struct soc_camera_link {
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/* Camera bus id, used to match a camera and a bus */
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int bus_id;
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/* GPIO number to switch between 8 and 10 bit modes */
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unsigned int gpio;
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};
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static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
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{
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return container_of(dev, struct soc_camera_device, dev);
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}
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static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
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{
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return container_of(dev, struct soc_camera_host, dev);
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}
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extern int soc_camera_host_register(struct soc_camera_host *ici,
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struct module *owner);
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extern void soc_camera_host_unregister(struct soc_camera_host *ici);
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extern int soc_camera_device_register(struct soc_camera_device *icd);
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extern void soc_camera_device_unregister(struct soc_camera_device *icd);
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extern int soc_camera_video_start(struct soc_camera_device *icd);
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extern void soc_camera_video_stop(struct soc_camera_device *icd);
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struct soc_camera_data_format {
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char *name;
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unsigned int depth;
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__u32 fourcc;
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enum v4l2_colorspace colorspace;
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};
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struct soc_camera_ops {
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struct module *owner;
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int (*init)(struct soc_camera_device *);
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int (*release)(struct soc_camera_device *);
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int (*start_capture)(struct soc_camera_device *);
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int (*stop_capture)(struct soc_camera_device *);
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int (*set_capture_format)(struct soc_camera_device *, __u32,
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struct v4l2_rect *, unsigned int);
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int (*try_fmt_cap)(struct soc_camera_device *, struct v4l2_format *);
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int (*get_chip_id)(struct soc_camera_device *,
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struct v4l2_chip_ident *);
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#ifdef CONFIG_VIDEO_ADV_DEBUG
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int (*get_register)(struct soc_camera_device *, struct v4l2_register *);
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int (*set_register)(struct soc_camera_device *, struct v4l2_register *);
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#endif
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const struct soc_camera_data_format *formats;
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int num_formats;
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int (*get_control)(struct soc_camera_device *, struct v4l2_control *);
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int (*set_control)(struct soc_camera_device *, struct v4l2_control *);
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const struct v4l2_queryctrl *controls;
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int num_controls;
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unsigned int(*get_datawidth)(struct soc_camera_device *icd);
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};
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static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
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struct soc_camera_ops *ops, int id)
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{
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int i;
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for (i = 0; i < ops->num_controls; i++)
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if (ops->controls[i].id == id)
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return &ops->controls[i];
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return NULL;
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}
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#define IS_MASTER (1<<0)
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#define IS_HSYNC_ACTIVE_HIGH (1<<1)
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#define IS_VSYNC_ACTIVE_HIGH (1<<2)
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#define IS_DATAWIDTH_8 (1<<3)
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#define IS_DATAWIDTH_9 (1<<4)
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#define IS_DATAWIDTH_10 (1<<5)
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#define IS_PCLK_SAMPLE_RISING (1<<6)
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#endif
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