drivers/usb/gadget/function/uvc.h

   1 /*
   2  *      uvc_gadget.h  --  USB Video Class Gadget driver
   3  *
   4  *      Copyright (C) 2009-2010
   5  *          Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   6  *
   7  *      This program is free software; you can redistribute it and/or modify
   8  *      it under the terms of the GNU General Public License as published by
   9  *      the Free Software Foundation; either version 2 of the License, or
  10  *      (at your option) any later version.
  11  */
  12
  13 #ifndef _UVC_GADGET_H_
  14 #define _UVC_GADGET_H_
  15
  16 #include <linux/ioctl.h>
  17 #include <linux/types.h>
  18 #include <linux/usb/ch9.h>
  19
  20 #define UVC_EVENT_FIRST                 (V4L2_EVENT_PRIVATE_START + 0)
  21 #define UVC_EVENT_CONNECT               (V4L2_EVENT_PRIVATE_START + 0)
  22 #define UVC_EVENT_DISCONNECT            (V4L2_EVENT_PRIVATE_START + 1)
  23 #define UVC_EVENT_STREAMON              (V4L2_EVENT_PRIVATE_START + 2)
  24 #define UVC_EVENT_STREAMOFF             (V4L2_EVENT_PRIVATE_START + 3)
  25 #define UVC_EVENT_SETUP                 (V4L2_EVENT_PRIVATE_START + 4)
  26 #define UVC_EVENT_DATA                  (V4L2_EVENT_PRIVATE_START + 5)
  27 #define UVC_EVENT_LAST                  (V4L2_EVENT_PRIVATE_START + 5)
  28
  29 struct uvc_request_data
  30 {
  31         __s32 length;
  32         __u8 data[60];
  33 };
  34
  35 struct uvc_event
  36 {
  37         union {
  38                 enum usb_device_speed speed;
  39                 struct usb_ctrlrequest req;
  40                 struct uvc_request_data data;
  41         };
  42 };
  43
  44 #define UVCIOC_SEND_RESPONSE            _IOW('U', 1, struct uvc_request_data)
  45
  46 #define UVC_INTF_CONTROL                0
  47 #define UVC_INTF_STREAMING              1
  48
  49 /* ------------------------------------------------------------------------
  50  * Debugging, printing and logging
  51  */
  52
  53 #ifdef __KERNEL__
  54
  55 #include <linux/usb.h>  /* For usb_endpoint_* */
  56 #include <linux/usb/composite.h>
  57 #include <linux/usb/gadget.h>
  58 #include <linux/videodev2.h>
  59 #include <media/v4l2-fh.h>
  60 #include <media/v4l2-device.h>
  61
  62 #include "uvc_queue.h"
  63
  64 #define UVC_TRACE_PROBE                         (1 << 0)
  65 #define UVC_TRACE_DESCR                         (1 << 1)
  66 #define UVC_TRACE_CONTROL                       (1 << 2)
  67 #define UVC_TRACE_FORMAT                        (1 << 3)
  68 #define UVC_TRACE_CAPTURE                       (1 << 4)
  69 #define UVC_TRACE_CALLS                         (1 << 5)
  70 #define UVC_TRACE_IOCTL                         (1 << 6)
  71 #define UVC_TRACE_FRAME                         (1 << 7)
  72 #define UVC_TRACE_SUSPEND                       (1 << 8)
  73 #define UVC_TRACE_STATUS                        (1 << 9)
  74
  75 #define UVC_WARN_MINMAX                         0
  76 #define UVC_WARN_PROBE_DEF                      1
  77
  78 extern unsigned int uvc_gadget_trace_param;
  79
  80 #define uvc_trace(flag, msg...) \
  81         do { \
  82                 if (uvc_gadget_trace_param & flag) \
  83                         printk(KERN_DEBUG "uvcvideo: " msg); \
  84         } while (0)
  85
  86 #define uvc_warn_once(dev, warn, msg...) \
  87         do { \
  88                 if (!test_and_set_bit(warn, &dev->warnings)) \
  89                         printk(KERN_INFO "uvcvideo: " msg); \
  90         } while (0)
  91
  92 #define uvc_printk(level, msg...) \
  93         printk(level "uvcvideo: " msg)
  94
  95 /* ------------------------------------------------------------------------
  96  * Driver specific constants
  97  */
  98
  99 #define UVC_NUM_REQUESTS                        4
 100 #define UVC_MAX_REQUEST_SIZE                    64
 101 #define UVC_MAX_EVENTS                          4
 102
 103 /* ------------------------------------------------------------------------
 104  * Structures
 105  */
 106
 107 struct uvc_video
 108 {
 109         struct usb_ep *ep;
 110
 111         /* Frame parameters */
 112         u8 bpp;
 113         u32 fcc;
 114         unsigned int width;
 115         unsigned int height;
 116         unsigned int imagesize;
 117         struct mutex mutex;     /* protects frame parameters */
 118
 119         /* Requests */
 120         unsigned int req_size;
 121         struct usb_request *req[UVC_NUM_REQUESTS];
 122         __u8 *req_buffer[UVC_NUM_REQUESTS];
 123         struct list_head req_free;
 124         spinlock_t req_lock;
 125
 126         void (*encode) (struct usb_request *req, struct uvc_video *video,
 127                         struct uvc_buffer *buf);
 128
 129         /* Context data used by the completion handler */
 130         __u32 payload_size;
 131         __u32 max_payload_size;
 132
 133         struct uvc_video_queue queue;
 134         unsigned int fid;
 135 };
 136
 137 enum uvc_state
 138 {
 139         UVC_STATE_DISCONNECTED,
 140         UVC_STATE_CONNECTED,
 141         UVC_STATE_STREAMING,
 142 };
 143
 144 struct uvc_device
 145 {
 146         struct video_device vdev;
 147         struct v4l2_device v4l2_dev;
 148         enum uvc_state state;
 149         struct usb_function func;
 150         struct uvc_video video;
 151
 152         /* Descriptors */
 153         struct {
 154                 const struct uvc_descriptor_header * const *fs_control;
 155                 const struct uvc_descriptor_header * const *ss_control;
 156                 const struct uvc_descriptor_header * const *fs_streaming;
 157                 const struct uvc_descriptor_header * const *hs_streaming;
 158                 const struct uvc_descriptor_header * const *ss_streaming;
 159         } desc;
 160
 161         unsigned int control_intf;
 162         struct usb_ep *control_ep;
 163         struct usb_request *control_req;
 164         void *control_buf;
 165
 166         unsigned int streaming_intf;
 167
 168         /* Events */
 169         unsigned int event_length;
 170         unsigned int event_setup_out : 1;
 171 };
 172
 173 static inline struct uvc_device *to_uvc(struct usb_function *f)
 174 {
 175         return container_of(f, struct uvc_device, func);
 176 }
 177
 178 struct uvc_file_handle
 179 {
 180         struct v4l2_fh vfh;
 181         struct uvc_video *device;
 182 };
 183
 184 #define to_uvc_file_handle(handle) \
 185         container_of(handle, struct uvc_file_handle, vfh)
 186
 187 /* ------------------------------------------------------------------------
 188  * Functions
 189  */
 190
 191 extern void uvc_function_setup_continue(struct uvc_device *uvc);
 192 extern void uvc_endpoint_stream(struct uvc_device *dev);
 193
 194 extern void uvc_function_connect(struct uvc_device *uvc);
 195 extern void uvc_function_disconnect(struct uvc_device *uvc);
 196
 197 #endif /* __KERNEL__ */
 198
 199 #endif /* _UVC_GADGET_H_ */
 200