300 lines
10 KiB
C
300 lines
10 KiB
C
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/*
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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/mutex.h>
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#include <linux/pm.h>
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#include <linux/videodev2.h>
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#include <media/videobuf-core.h>
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#include <media/v4l2-device.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 *pdev; /* Platform device */
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s32 user_width;
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s32 user_height;
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unsigned short width_min;
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unsigned short height_min;
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unsigned short y_skip_top; /* Lines to skip at the top */
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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 buswidth; /* See comment in .c */
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struct soc_camera_sense *sense; /* See comment in struct definition */
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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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const struct soc_camera_data_format *formats;
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int num_formats;
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struct soc_camera_format_xlate *user_formats;
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int num_user_formats;
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enum v4l2_field field; /* Preserve field over close() */
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void *host_priv; /* Per-device host private data */
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/* soc_camera.c private count. Only accessed with .video_lock held */
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int use_count;
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struct mutex video_lock; /* Protects device data */
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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 v4l2_device v4l2_dev;
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struct list_head list;
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unsigned char nr; /* Host number */
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void *priv;
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const char *drv_name;
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struct soc_camera_host_ops *ops;
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};
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struct soc_camera_host_ops {
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struct module *owner;
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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 (*suspend)(struct soc_camera_device *, pm_message_t);
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int (*resume)(struct soc_camera_device *);
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/*
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* .get_formats() is called for each client device format, but
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* .put_formats() is only called once. Further, if any of the calls to
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* .get_formats() fail, .put_formats() will not be called at all, the
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* failing .get_formats() must then clean up internally.
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*/
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int (*get_formats)(struct soc_camera_device *, int,
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struct soc_camera_format_xlate *);
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void (*put_formats)(struct soc_camera_device *);
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int (*cropcap)(struct soc_camera_device *, struct v4l2_cropcap *);
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int (*get_crop)(struct soc_camera_device *, struct v4l2_crop *);
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int (*set_crop)(struct soc_camera_device *, struct v4l2_crop *);
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int (*set_fmt)(struct soc_camera_device *, struct v4l2_format *);
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int (*try_fmt)(struct soc_camera_device *, struct v4l2_format *);
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void (*init_videobuf)(struct videobuf_queue *,
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struct soc_camera_device *);
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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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int (*set_bus_param)(struct soc_camera_device *, __u32);
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int (*get_ctrl)(struct soc_camera_device *, struct v4l2_control *);
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int (*set_ctrl)(struct soc_camera_device *, struct v4l2_control *);
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unsigned int (*poll)(struct file *, poll_table *);
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const struct v4l2_queryctrl *controls;
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int num_controls;
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};
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#define SOCAM_SENSOR_INVERT_PCLK (1 << 0)
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#define SOCAM_SENSOR_INVERT_MCLK (1 << 1)
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#define SOCAM_SENSOR_INVERT_HSYNC (1 << 2)
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#define SOCAM_SENSOR_INVERT_VSYNC (1 << 3)
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#define SOCAM_SENSOR_INVERT_DATA (1 << 4)
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struct i2c_board_info;
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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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/* Per camera SOCAM_SENSOR_* bus flags */
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unsigned long flags;
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int i2c_adapter_id;
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struct i2c_board_info *board_info;
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const char *module_name;
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/*
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* For non-I2C devices platform platform has to provide methods to
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* add a device to the system and to remove
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*/
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int (*add_device)(struct soc_camera_link *, struct device *);
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void (*del_device)(struct soc_camera_link *);
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/* Optional callbacks to power on or off and reset the sensor */
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int (*power)(struct device *, int);
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int (*reset)(struct device *);
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/*
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* some platforms may support different data widths than the sensors
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* native ones due to different data line routing. Let the board code
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* overwrite the width flags.
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*/
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int (*set_bus_param)(struct soc_camera_link *, unsigned long flags);
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unsigned long (*query_bus_param)(struct soc_camera_link *);
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void (*free_bus)(struct soc_camera_link *);
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};
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static inline struct soc_camera_device *to_soc_camera_dev(
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const 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(
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const struct device *dev)
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{
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struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
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return container_of(v4l2_dev, struct soc_camera_host, v4l2_dev);
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}
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static inline struct soc_camera_link *to_soc_camera_link(
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const struct soc_camera_device *icd)
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{
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return icd->dev.platform_data;
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}
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static inline struct device *to_soc_camera_control(
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const struct soc_camera_device *icd)
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{
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return dev_get_drvdata(&icd->dev);
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}
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static inline struct v4l2_subdev *soc_camera_to_subdev(
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const struct soc_camera_device *icd)
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{
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struct device *control = to_soc_camera_control(icd);
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return dev_get_drvdata(control);
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}
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int soc_camera_host_register(struct soc_camera_host *ici);
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void soc_camera_host_unregister(struct soc_camera_host *ici);
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const struct soc_camera_data_format *soc_camera_format_by_fourcc(
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struct soc_camera_device *icd, unsigned int fourcc);
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const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
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struct soc_camera_device *icd, unsigned int fourcc);
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struct soc_camera_data_format {
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const 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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/**
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* struct soc_camera_format_xlate - match between host and sensor formats
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* @cam_fmt: sensor format provided by the sensor
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* @host_fmt: host format after host translation from cam_fmt
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* @buswidth: bus width for this format
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*
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* Host and sensor translation structure. Used in table of host and sensor
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* formats matchings in soc_camera_device. A host can override the generic list
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* generation by implementing get_formats(), and use it for format checks and
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* format setup.
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*/
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struct soc_camera_format_xlate {
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const struct soc_camera_data_format *cam_fmt;
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const struct soc_camera_data_format *host_fmt;
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unsigned char buswidth;
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};
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struct soc_camera_ops {
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int (*suspend)(struct soc_camera_device *, pm_message_t state);
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int (*resume)(struct soc_camera_device *);
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unsigned long (*query_bus_param)(struct soc_camera_device *);
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int (*set_bus_param)(struct soc_camera_device *, unsigned long);
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int (*enum_input)(struct soc_camera_device *, struct v4l2_input *);
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const struct v4l2_queryctrl *controls;
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int num_controls;
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};
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#define SOCAM_SENSE_PCLK_CHANGED (1 << 0)
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/**
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* This struct can be attached to struct soc_camera_device by the host driver
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* to request sense from the camera, for example, when calling .set_fmt(). The
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* host then can check which flags are set and verify respective values if any.
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* For example, if SOCAM_SENSE_PCLK_CHANGED is set, it means, pixclock has
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* changed during this operation. After completion the host should detach sense.
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*
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* @flags ored SOCAM_SENSE_* flags
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* @master_clock if the host wants to be informed about pixel-clock
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* change, it better set master_clock.
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* @pixel_clock_max maximum pixel clock frequency supported by the host,
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* camera is not allowed to exceed this.
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* @pixel_clock if the camera driver changed pixel clock during this
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* operation, it sets SOCAM_SENSE_PCLK_CHANGED, uses
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* master_clock to calculate the new pixel-clock and
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* sets this field.
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*/
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struct soc_camera_sense {
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unsigned long flags;
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unsigned long master_clock;
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unsigned long pixel_clock_max;
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unsigned long pixel_clock;
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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 SOCAM_MASTER (1 << 0)
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#define SOCAM_SLAVE (1 << 1)
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#define SOCAM_HSYNC_ACTIVE_HIGH (1 << 2)
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#define SOCAM_HSYNC_ACTIVE_LOW (1 << 3)
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#define SOCAM_VSYNC_ACTIVE_HIGH (1 << 4)
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#define SOCAM_VSYNC_ACTIVE_LOW (1 << 5)
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#define SOCAM_DATAWIDTH_4 (1 << 6)
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#define SOCAM_DATAWIDTH_8 (1 << 7)
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#define SOCAM_DATAWIDTH_9 (1 << 8)
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#define SOCAM_DATAWIDTH_10 (1 << 9)
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#define SOCAM_DATAWIDTH_15 (1 << 10)
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#define SOCAM_DATAWIDTH_16 (1 << 11)
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#define SOCAM_PCLK_SAMPLE_RISING (1 << 12)
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#define SOCAM_PCLK_SAMPLE_FALLING (1 << 13)
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#define SOCAM_DATA_ACTIVE_HIGH (1 << 14)
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#define SOCAM_DATA_ACTIVE_LOW (1 << 15)
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#define SOCAM_DATAWIDTH_MASK (SOCAM_DATAWIDTH_4 | SOCAM_DATAWIDTH_8 | \
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SOCAM_DATAWIDTH_9 | SOCAM_DATAWIDTH_10 | \
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SOCAM_DATAWIDTH_15 | SOCAM_DATAWIDTH_16)
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static inline unsigned long soc_camera_bus_param_compatible(
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unsigned long camera_flags, unsigned long bus_flags)
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{
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unsigned long common_flags, hsync, vsync, pclk, data, buswidth, mode;
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common_flags = camera_flags & bus_flags;
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hsync = common_flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
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vsync = common_flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
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pclk = common_flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
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data = common_flags & (SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW);
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mode = common_flags & (SOCAM_MASTER | SOCAM_SLAVE);
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buswidth = common_flags & SOCAM_DATAWIDTH_MASK;
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return (!hsync || !vsync || !pclk || !data || !mode || !buswidth) ? 0 :
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common_flags;
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}
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static inline void soc_camera_limit_side(unsigned int *start,
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unsigned int *length, unsigned int start_min,
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unsigned int length_min, unsigned int length_max)
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{
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if (*length < length_min)
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*length = length_min;
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else if (*length > length_max)
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*length = length_max;
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if (*start < start_min)
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*start = start_min;
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else if (*start > start_min + length_max - *length)
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*start = start_min + length_max - *length;
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}
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extern unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
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unsigned long flags);
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#endif
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