drivers/usb/gadget/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
  14 #ifndef _UVC_GADGET_H_
  15 #define _UVC_GADGET_H_
  16
  17 #include <linux/ioctl.h>
  18 #include <linux/types.h>
  19 #include <linux/usb/ch9.h>
  20
  21 #define UVC_EVENT_FIRST                 (V4L2_EVENT_PRIVATE_START + 0)
  22 #define UVC_EVENT_CONNECT               (V4L2_EVENT_PRIVATE_START + 0)
  23 #define UVC_EVENT_DISCONNECT            (V4L2_EVENT_PRIVATE_START + 1)
  24 #define UVC_EVENT_STREAMON              (V4L2_EVENT_PRIVATE_START + 2)
  25 #define UVC_EVENT_STREAMOFF             (V4L2_EVENT_PRIVATE_START + 3)
  26 #define UVC_EVENT_SETUP                 (V4L2_EVENT_PRIVATE_START + 4)
  27 #define UVC_EVENT_DATA                  (V4L2_EVENT_PRIVATE_START + 5)
  28 #define UVC_EVENT_LAST                  (V4L2_EVENT_PRIVATE_START + 5)
  29
  30 struct uvc_request_data
  31 {
  32         unsigned int length;
  33         __u8 data[60];
  34 };
  35
  36 struct uvc_event
  37 {
  38         union {
  39                 enum usb_device_speed speed;
  40                 struct usb_ctrlrequest req;
  41                 struct uvc_request_data data;
  42         };
  43 };
  44
  45 #define UVCIOC_SEND_RESPONSE            _IOW('U', 1, struct uvc_request_data)
  46
  47 #define UVC_INTF_CONTROL                0
  48 #define UVC_INTF_STREAMING              1
  49
  50 /* ------------------------------------------------------------------------
  51  * Debugging, printing and logging
  52  */
  53
  54 #ifdef __KERNEL__
  55
  56 #include <linux/usb.h>  /* For usb_endpoint_* */
  57 #include <linux/usb/gadget.h>
  58 #include <linux/videodev2.h>
  59 #include <linux/version.h>
  60 #include <media/v4l2-fh.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 DRIVER_VERSION                          "0.1.0"
 100 #define DRIVER_VERSION_NUMBER                   KERNEL_VERSION(0, 1, 0)
 101
 102 #define DMA_ADDR_INVALID                        (~(dma_addr_t)0)
 103
 104 #define UVC_NUM_REQUESTS                        4
 105 #define UVC_MAX_REQUEST_SIZE                    64
 106 #define UVC_MAX_EVENTS                          4
 107
 108 /* ------------------------------------------------------------------------
 109  * Structures
 110  */
 111
 112 struct uvc_video
 113 {
 114         struct usb_ep *ep;
 115
 116         /* Frame parameters */
 117         u8 bpp;
 118         u32 fcc;
 119         unsigned int width;
 120         unsigned int height;
 121         unsigned int imagesize;
 122
 123         /* Requests */
 124         unsigned int req_size;
 125         struct usb_request *req[UVC_NUM_REQUESTS];
 126         __u8 *req_buffer[UVC_NUM_REQUESTS];
 127         struct list_head req_free;
 128         spinlock_t req_lock;
 129
 130         void (*encode) (struct usb_request *req, struct uvc_video *video,
 131                         struct uvc_buffer *buf);
 132
 133         /* Context data used by the completion handler */
 134         __u32 payload_size;
 135         __u32 max_payload_size;
 136
 137         struct uvc_video_queue queue;
 138         unsigned int fid;
 139 };
 140
 141 enum uvc_state
 142 {
 143         UVC_STATE_DISCONNECTED,
 144         UVC_STATE_CONNECTED,
 145         UVC_STATE_STREAMING,
 146 };
 147
 148 struct uvc_device
 149 {
 150         struct video_device *vdev;
 151         enum uvc_state state;
 152         struct usb_function func;
 153         struct uvc_video video;
 154
 155         /* Descriptors */
 156         struct {
 157                 const struct uvc_descriptor_header * const *control;
 158                 const struct uvc_descriptor_header * const *fs_streaming;
 159                 const struct uvc_descriptor_header * const *hs_streaming;
 160         } desc;
 161
 162         unsigned int control_intf;
 163         struct usb_ep *control_ep;
 164         struct usb_request *control_req;
 165         void *control_buf;
 166
 167         unsigned int streaming_intf;
 168
 169         /* Events */
 170         unsigned int event_length;
 171         unsigned int event_setup_out : 1;
 172 };
 173
 174 static inline struct uvc_device *to_uvc(struct usb_function *f)
 175 {
 176         return container_of(f, struct uvc_device, func);
 177 }
 178
 179 struct uvc_file_handle
 180 {
 181         struct v4l2_fh vfh;
 182         struct uvc_video *device;
 183 };
 184
 185 #define to_uvc_file_handle(handle) \
 186         container_of(handle, struct uvc_file_handle, vfh)
 187
 188 /* ------------------------------------------------------------------------
 189  * Functions
 190  */
 191
 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