drivers/usb/gadget/function/uvc.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *      uvc_gadget.h  --  USB Video Class Gadget driver
   4  *
   5  *      Copyright (C) 2009-2010
   6  *          Laurent Pinchart ([email protected])
   7  */
   8
   9 #ifndef _UVC_GADGET_H_
  10 #define _UVC_GADGET_H_
  11
  12 #include <linux/list.h>
  13 #include <linux/mutex.h>
  14 #include <linux/spinlock.h>
  15 #include <linux/usb/composite.h>
  16 #include <linux/videodev2.h>
  17
  18 #include <media/v4l2-device.h>
  19 #include <media/v4l2-dev.h>
  20 #include <media/v4l2-fh.h>
  21
  22 #include "uvc_queue.h"
  23
  24 struct usb_ep;
  25 struct usb_request;
  26 struct uvc_descriptor_header;
  27 struct uvc_device;
  28
  29 /* ------------------------------------------------------------------------
  30  * Debugging, printing and logging
  31  */
  32
  33 #define UVC_TRACE_PROBE                         (1 << 0)
  34 #define UVC_TRACE_DESCR                         (1 << 1)
  35 #define UVC_TRACE_CONTROL                       (1 << 2)
  36 #define UVC_TRACE_FORMAT                        (1 << 3)
  37 #define UVC_TRACE_CAPTURE                       (1 << 4)
  38 #define UVC_TRACE_CALLS                         (1 << 5)
  39 #define UVC_TRACE_IOCTL                         (1 << 6)
  40 #define UVC_TRACE_FRAME                         (1 << 7)
  41 #define UVC_TRACE_SUSPEND                       (1 << 8)
  42 #define UVC_TRACE_STATUS                        (1 << 9)
  43
  44 #define UVC_WARN_MINMAX                         0
  45 #define UVC_WARN_PROBE_DEF                      1
  46
  47 extern unsigned int uvc_gadget_trace_param;
  48
  49 #define uvc_trace(flag, msg...) \
  50         do { \
  51                 if (uvc_gadget_trace_param & flag) \
  52                         printk(KERN_DEBUG "uvcvideo: " msg); \
  53         } while (0)
  54
  55 #define uvcg_dbg(f, fmt, args...) \
  56         dev_dbg(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
  57 #define uvcg_info(f, fmt, args...) \
  58         dev_info(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
  59 #define uvcg_warn(f, fmt, args...) \
  60         dev_warn(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
  61 #define uvcg_err(f, fmt, args...) \
  62         dev_err(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
  63
  64 /* ------------------------------------------------------------------------
  65  * Driver specific constants
  66  */
  67
  68 #define UVC_NUM_REQUESTS                        4
  69 #define UVC_MAX_REQUEST_SIZE                    64
  70 #define UVC_MAX_EVENTS                          4
  71
  72 /* ------------------------------------------------------------------------
  73  * Structures
  74  */
  75
  76 struct uvc_video {
  77         struct uvc_device *uvc;
  78         struct usb_ep *ep;
  79
  80         /* Frame parameters */
  81         u8 bpp;
  82         u32 fcc;
  83         unsigned int width;
  84         unsigned int height;
  85         unsigned int imagesize;
  86         struct mutex mutex;     /* protects frame parameters */
  87
  88         /* Requests */
  89         unsigned int req_size;
  90         struct usb_request *req[UVC_NUM_REQUESTS];
  91         __u8 *req_buffer[UVC_NUM_REQUESTS];
  92         struct list_head req_free;
  93         spinlock_t req_lock;
  94
  95         void (*encode) (struct usb_request *req, struct uvc_video *video,
  96                         struct uvc_buffer *buf);
  97
  98         /* Context data used by the completion handler */
  99         __u32 payload_size;
 100         __u32 max_payload_size;
 101
 102         struct uvc_video_queue queue;
 103         unsigned int fid;
 104 };
 105
 106 enum uvc_state {
 107         UVC_STATE_DISCONNECTED,
 108         UVC_STATE_CONNECTED,
 109         UVC_STATE_STREAMING,
 110 };
 111
 112 struct uvc_device {
 113         struct video_device vdev;
 114         struct v4l2_device v4l2_dev;
 115         enum uvc_state state;
 116         struct usb_function func;
 117         struct uvc_video video;
 118
 119         /* Descriptors */
 120         struct {
 121                 const struct uvc_descriptor_header * const *fs_control;
 122                 const struct uvc_descriptor_header * const *ss_control;
 123                 const struct uvc_descriptor_header * const *fs_streaming;
 124                 const struct uvc_descriptor_header * const *hs_streaming;
 125                 const struct uvc_descriptor_header * const *ss_streaming;
 126         } desc;
 127
 128         unsigned int control_intf;
 129         struct usb_ep *control_ep;
 130         struct usb_request *control_req;
 131         void *control_buf;
 132
 133         unsigned int streaming_intf;
 134
 135         /* Events */
 136         unsigned int event_length;
 137         unsigned int event_setup_out : 1;
 138 };
 139
 140 static inline struct uvc_device *to_uvc(struct usb_function *f)
 141 {
 142         return container_of(f, struct uvc_device, func);
 143 }
 144
 145 struct uvc_file_handle {
 146         struct v4l2_fh vfh;
 147         struct uvc_video *device;
 148 };
 149
 150 #define to_uvc_file_handle(handle) \
 151         container_of(handle, struct uvc_file_handle, vfh)
 152
 153 /* ------------------------------------------------------------------------
 154  * Functions
 155  */
 156
 157 extern void uvc_function_setup_continue(struct uvc_device *uvc);
 158 extern void uvc_endpoint_stream(struct uvc_device *dev);
 159
 160 extern void uvc_function_connect(struct uvc_device *uvc);
 161 extern void uvc_function_disconnect(struct uvc_device *uvc);
 162
 163 #endif /* _UVC_GADGET_H_ */