uvc.h

Go to the documentation of this file.

/*
 *  uvc_gadget.h  --  USB Video Class Gadget driver
 *
 *  Copyright (C) 2009-2010
 *      Laurent Pinchart ([email protected])
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 */

#ifndef _UVC_GADGET_H_
#define _UVC_GADGET_H_

#include <linux/ioctl.h>
#include <linux/types.h>
#include <linux/usb/ch9.h>

#define UVC_EVENT_FIRST         (V4L2_EVENT_PRIVATE_START + 0)
#define UVC_EVENT_CONNECT       (V4L2_EVENT_PRIVATE_START + 0)
#define UVC_EVENT_DISCONNECT        (V4L2_EVENT_PRIVATE_START + 1)
#define UVC_EVENT_STREAMON      (V4L2_EVENT_PRIVATE_START + 2)
#define UVC_EVENT_STREAMOFF     (V4L2_EVENT_PRIVATE_START + 3)
#define UVC_EVENT_SETUP         (V4L2_EVENT_PRIVATE_START + 4)
#define UVC_EVENT_DATA          (V4L2_EVENT_PRIVATE_START + 5)
#define UVC_EVENT_LAST          (V4L2_EVENT_PRIVATE_START + 5)

struct uvc_request_data
{
    __s32 length;
    __u8 data[60];
};

struct uvc_event
{
    union {
        enum usb_device_speed speed;
        struct usb_ctrlrequest req;
        struct uvc_request_data data;
    };
};

#define UVCIOC_SEND_RESPONSE        _IOW('U', 1, struct uvc_request_data)

#define UVC_INTF_CONTROL        0
#define UVC_INTF_STREAMING      1

/* ------------------------------------------------------------------------
 * Debugging, printing and logging
 */

#ifdef __KERNEL__

#include <linux/usb.h>  /* For usb_endpoint_* */
#include <linux/usb/gadget.h>
#include <linux/videodev2.h>
#include <linux/version.h>
#include <media/v4l2-fh.h>

#include "uvc_queue.h"

#define UVC_TRACE_PROBE             (1 << 0)
#define UVC_TRACE_DESCR             (1 << 1)
#define UVC_TRACE_CONTROL           (1 << 2)
#define UVC_TRACE_FORMAT            (1 << 3)
#define UVC_TRACE_CAPTURE           (1 << 4)
#define UVC_TRACE_CALLS             (1 << 5)
#define UVC_TRACE_IOCTL             (1 << 6)
#define UVC_TRACE_FRAME             (1 << 7)
#define UVC_TRACE_SUSPEND           (1 << 8)
#define UVC_TRACE_STATUS            (1 << 9)

#define UVC_WARN_MINMAX             0
#define UVC_WARN_PROBE_DEF          1

extern unsigned int uvc_gadget_trace_param;

#define uvc_trace(flag, msg...) \
    do { \
        if (uvc_gadget_trace_param & flag) \
            printk(KERN_DEBUG "uvcvideo: " msg); \
    } while (0)

#define uvc_warn_once(dev, warn, msg...) \
    do { \
        if (!test_and_set_bit(warn, &dev->warnings)) \
            printk(KERN_INFO "uvcvideo: " msg); \
    } while (0)

#define uvc_printk(level, msg...) \
    printk(level "uvcvideo: " msg)

/* ------------------------------------------------------------------------
 * Driver specific constants
 */

#define DRIVER_VERSION              "0.1.0"
#define DRIVER_VERSION_NUMBER           KERNEL_VERSION(0, 1, 0)

#define DMA_ADDR_INVALID            (~(dma_addr_t)0)

#define UVC_NUM_REQUESTS            4
#define UVC_MAX_REQUEST_SIZE            64
#define UVC_MAX_EVENTS              4

/* ------------------------------------------------------------------------
 * Structures
 */

struct uvc_video
{
    struct usb_ep *ep;

    /* Frame parameters */
    u8 bpp;
    u32 fcc;
    unsigned int width;
    unsigned int height;
    unsigned int imagesize;

    /* Requests */
    unsigned int req_size;
    struct usb_request *req[UVC_NUM_REQUESTS];
    __u8 *req_buffer[UVC_NUM_REQUESTS];
    struct list_head req_free;
    spinlock_t req_lock;

    void (*encode) (struct usb_request *req, struct uvc_video *video,
            struct uvc_buffer *buf);

    /* Context data used by the completion handler */
    __u32 payload_size;
    __u32 max_payload_size;

    struct uvc_video_queue queue;
    unsigned int fid;
};

enum uvc_state
{
    UVC_STATE_DISCONNECTED,
    UVC_STATE_CONNECTED,
    UVC_STATE_STREAMING,
};

struct uvc_device
{
    struct video_device *vdev;
    enum uvc_state state;
    struct usb_function func;
    struct uvc_video video;

    /* Descriptors */
    struct {
        const struct uvc_descriptor_header * const *fs_control;
        const struct uvc_descriptor_header * const *ss_control;
        const struct uvc_descriptor_header * const *fs_streaming;
        const struct uvc_descriptor_header * const *hs_streaming;
        const struct uvc_descriptor_header * const *ss_streaming;
    } desc;

    unsigned int control_intf;
    struct usb_ep *control_ep;
    struct usb_request *control_req;
    void *control_buf;

    unsigned int streaming_intf;

    /* Events */
    unsigned int event_length;
    unsigned int event_setup_out : 1;
};

static inline struct uvc_device *to_uvc(struct usb_function *f)
{
    return container_of(f, struct uvc_device, func);
}

struct uvc_file_handle
{
    struct v4l2_fh vfh;
    struct uvc_video *device;
};

#define to_uvc_file_handle(handle) \
    container_of(handle, struct uvc_file_handle, vfh)

/* ------------------------------------------------------------------------
 * Functions
 */

extern void uvc_endpoint_stream(struct uvc_device *dev);

extern void uvc_function_connect(struct uvc_device *uvc);
extern void uvc_function_disconnect(struct uvc_device *uvc);

#endif /* __KERNEL__ */

#endif /* _UVC_GADGET_H_ */