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Multiple user-space application instances can open the same video device, but it only makes sense for one of them to manage the videobuffer queue and set video format of the device. Restrict soc-camera respectively. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
298 lines
10 KiB
C
298 lines
10 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/device.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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extern struct bus_type soc_camera_bus_type;
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struct file;
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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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enum v4l2_colorspace colorspace;
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unsigned char iface; /* Host number */
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unsigned char devnum; /* Device number per host */
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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_format_xlate *current_fmt;
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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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struct file *streamer; /* stream owner */
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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 *, unsigned 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_device *, 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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int (*get_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
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int (*set_parm)(struct soc_camera_device *, struct v4l2_streamparm *);
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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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void *priv;
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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_format_xlate *soc_camera_xlate_by_fourcc(
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struct soc_camera_device *icd, unsigned int fourcc);
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/**
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* struct soc_camera_format_xlate - match between host and sensor formats
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* @code: code of a sensor provided format
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* @host_fmt: host format after host translation from code
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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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enum v4l2_mbus_pixelcode code;
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const struct soc_mbus_pixelfmt *host_fmt;
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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(int *start, int *length,
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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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/* This is only temporary here - until v4l2-subdev begins to link to video_device */
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#include <linux/i2c.h>
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static inline struct video_device *soc_camera_i2c_to_vdev(struct i2c_client *client)
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{
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struct soc_camera_device *icd = client->dev.platform_data;
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return icd->vdev;
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}
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#endif
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