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 #include <linux/wait.h>
18
19 #include <media/v4l2-device.h>
20 #include <media/v4l2-dev.h>
21 #include <media/v4l2-fh.h>
22
23 #include "uvc_queue.h"
24
25 struct usb_ep;
26 struct usb_request;
27 struct uvc_descriptor_header;
28 struct uvc_device;
29
30 /* ------------------------------------------------------------------------
31 * Debugging, printing and logging
32 */
33
34 #define UVC_TRACE_PROBE (1 << 0)
35 #define UVC_TRACE_DESCR (1 << 1)
36 #define UVC_TRACE_CONTROL (1 << 2)
37 #define UVC_TRACE_FORMAT (1 << 3)
38 #define UVC_TRACE_CAPTURE (1 << 4)
39 #define UVC_TRACE_CALLS (1 << 5)
40 #define UVC_TRACE_IOCTL (1 << 6)
41 #define UVC_TRACE_FRAME (1 << 7)
42 #define UVC_TRACE_SUSPEND (1 << 8)
43 #define UVC_TRACE_STATUS (1 << 9)
44
45 #define UVC_WARN_MINMAX 0
46 #define UVC_WARN_PROBE_DEF 1
47
48 extern unsigned int uvc_gadget_trace_param;
49
50 #define uvc_trace(flag, msg...) \
51 do { \
52 if (uvc_gadget_trace_param & flag) \
53 printk(KERN_DEBUG "uvcvideo: " msg); \
54 } while (0)
55
56 #define uvcg_dbg(f, fmt, args...) \
57 dev_dbg(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
58 #define uvcg_info(f, fmt, args...) \
59 dev_info(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
60 #define uvcg_warn(f, fmt, args...) \
61 dev_warn(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
62 #define uvcg_err(f, fmt, args...) \
63 dev_err(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
64
65 /* ------------------------------------------------------------------------
66 * Driver specific constants
67 */
68
69 #define UVC_MAX_REQUEST_SIZE 64
70 #define UVC_MAX_EVENTS 4
71
72 #define UVCG_REQUEST_HEADER_LEN 12
73
74 /* ------------------------------------------------------------------------
75 * Structures
76 */
77 struct uvc_request {
78 struct usb_request *req;
79 u8 *req_buffer;
80 struct uvc_video *video;
81 struct sg_table sgt;
82 u8 header[UVCG_REQUEST_HEADER_LEN];
83 struct uvc_buffer *last_buf;
84 };
85
86 struct uvc_video {
87 struct uvc_device *uvc;
88 struct usb_ep *ep;
89
90 struct work_struct pump;
91 struct workqueue_struct *async_wq;
92
93 /* Frame parameters */
94 u8 bpp;
95 u32 fcc;
96 unsigned int width;
97 unsigned int height;
98 unsigned int imagesize;
99 struct mutex mutex; /* protects frame parameters */
100
101 unsigned int uvc_num_requests;
102
103 /* Requests */
104 unsigned int req_size;
105 struct uvc_request *ureq;
106 struct list_head req_free;
107 spinlock_t req_lock;
108
109 unsigned int req_int_count;
110
111 void (*encode) (struct usb_request *req, struct uvc_video *video,
112 struct uvc_buffer *buf);
113
114 /* Context data used by the completion handler */
115 __u32 payload_size;
116 __u32 max_payload_size;
117
118 struct uvc_video_queue queue;
119 unsigned int fid;
120 };
121
122 enum uvc_state {
123 UVC_STATE_DISCONNECTED,
124 UVC_STATE_CONNECTED,
125 UVC_STATE_STREAMING,
126 };
127
128 struct uvc_device {
129 struct video_device vdev;
130 struct v4l2_device v4l2_dev;
131 enum uvc_state state;
132 struct usb_function func;
133 struct uvc_video video;
134 bool func_connected;
135 wait_queue_head_t func_connected_queue;
136
137 struct uvcg_streaming_header *header;
138
139 /* Descriptors */
140 struct {
141 const struct uvc_descriptor_header * const *fs_control;
142 const struct uvc_descriptor_header * const *ss_control;
143 const struct uvc_descriptor_header * const *fs_streaming;
144 const struct uvc_descriptor_header * const *hs_streaming;
145 const struct uvc_descriptor_header * const *ss_streaming;
146 struct list_head *extension_units;
147 } desc;
148
149 unsigned int control_intf;
150 struct usb_ep *interrupt_ep;
151 struct usb_request *control_req;
152 void *control_buf;
153 bool enable_interrupt_ep;
154
155 unsigned int streaming_intf;
156
157 /* Events */
158 unsigned int event_length;
159 unsigned int event_setup_out : 1;
160 };
161
to_uvc(struct usb_function * f)162 static inline struct uvc_device *to_uvc(struct usb_function *f)
163 {
164 return container_of(f, struct uvc_device, func);
165 }
166
167 struct uvc_file_handle {
168 struct v4l2_fh vfh;
169 struct uvc_video *device;
170 bool is_uvc_app_handle;
171 };
172
173 #define to_uvc_file_handle(handle) \
174 container_of(handle, struct uvc_file_handle, vfh)
175
176 /* ------------------------------------------------------------------------
177 * Functions
178 */
179
180 extern void uvc_function_setup_continue(struct uvc_device *uvc);
181 extern void uvc_endpoint_stream(struct uvc_device *dev);
182
183 extern void uvc_function_connect(struct uvc_device *uvc);
184 extern void uvc_function_disconnect(struct uvc_device *uvc);
185
186 #endif /* _UVC_GADGET_H_ */
187