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 (laurent.pinchart@ideasonboard.com) 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_ */ 164