1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * uvc_configfs.h
4 *
5 * Configfs support for the uvc function.
6 *
7 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
8 * http://www.samsung.com
9 *
10 * Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
11 */
12 #ifndef UVC_CONFIGFS_H
13 #define UVC_CONFIGFS_H
14
15 #include <linux/configfs.h>
16
17 #include "u_uvc.h"
18
to_f_uvc_opts(struct config_item * item)19 static inline struct f_uvc_opts *to_f_uvc_opts(struct config_item *item)
20 {
21 return container_of(to_config_group(item), struct f_uvc_opts,
22 func_inst.group);
23 }
24
25 #define UVCG_STREAMING_CONTROL_SIZE 1
26
27 DECLARE_UVC_HEADER_DESCRIPTOR(1);
28
29 struct uvcg_control_header {
30 struct config_item item;
31 struct UVC_HEADER_DESCRIPTOR(1) desc;
32 unsigned linked;
33 };
34
to_uvcg_control_header(struct config_item * item)35 static inline struct uvcg_control_header *to_uvcg_control_header(struct config_item *item)
36 {
37 return container_of(item, struct uvcg_control_header, item);
38 }
39
40 struct uvcg_color_matching {
41 struct config_group group;
42 struct uvc_color_matching_descriptor desc;
43 unsigned int refcnt;
44 };
45
46 #define to_uvcg_color_matching(group_ptr) \
47 container_of(group_ptr, struct uvcg_color_matching, group)
48
49 enum uvcg_format_type {
50 UVCG_UNCOMPRESSED = 0,
51 UVCG_MJPEG,
52 };
53
54 struct uvcg_format {
55 struct config_group group;
56 enum uvcg_format_type type;
57 unsigned linked;
58 struct list_head frames;
59 unsigned num_frames;
60 __u8 bmaControls[UVCG_STREAMING_CONTROL_SIZE];
61 struct uvcg_color_matching *color_matching;
62 };
63
64 struct uvcg_format_ptr {
65 struct uvcg_format *fmt;
66 struct list_head entry;
67 };
68
to_uvcg_format(struct config_item * item)69 static inline struct uvcg_format *to_uvcg_format(struct config_item *item)
70 {
71 return container_of(to_config_group(item), struct uvcg_format, group);
72 }
73
74 struct uvcg_streaming_header {
75 struct config_item item;
76 struct uvc_input_header_descriptor desc;
77 unsigned linked;
78 struct list_head formats;
79 unsigned num_fmt;
80 };
81
to_uvcg_streaming_header(struct config_item * item)82 static inline struct uvcg_streaming_header *to_uvcg_streaming_header(struct config_item *item)
83 {
84 return container_of(item, struct uvcg_streaming_header, item);
85 }
86
87 struct uvcg_frame_ptr {
88 struct uvcg_frame *frm;
89 struct list_head entry;
90 };
91
92 struct uvcg_frame {
93 struct config_item item;
94 enum uvcg_format_type fmt_type;
95 struct {
96 u8 b_length;
97 u8 b_descriptor_type;
98 u8 b_descriptor_subtype;
99 u8 b_frame_index;
100 u8 bm_capabilities;
101 u16 w_width;
102 u16 w_height;
103 u32 dw_min_bit_rate;
104 u32 dw_max_bit_rate;
105 u32 dw_max_video_frame_buffer_size;
106 u32 dw_default_frame_interval;
107 u8 b_frame_interval_type;
108 } __attribute__((packed)) frame;
109 u32 *dw_frame_interval;
110 };
111
to_uvcg_frame(struct config_item * item)112 static inline struct uvcg_frame *to_uvcg_frame(struct config_item *item)
113 {
114 return container_of(item, struct uvcg_frame, item);
115 }
116
117 /* -----------------------------------------------------------------------------
118 * streaming/uncompressed/<NAME>
119 */
120
121 struct uvcg_uncompressed {
122 struct uvcg_format fmt;
123 struct uvc_format_uncompressed desc;
124 };
125
to_uvcg_uncompressed(struct config_item * item)126 static inline struct uvcg_uncompressed *to_uvcg_uncompressed(struct config_item *item)
127 {
128 return container_of(to_uvcg_format(item), struct uvcg_uncompressed, fmt);
129 }
130
131 /* -----------------------------------------------------------------------------
132 * streaming/mjpeg/<NAME>
133 */
134
135 struct uvcg_mjpeg {
136 struct uvcg_format fmt;
137 struct uvc_format_mjpeg desc;
138 };
139
to_uvcg_mjpeg(struct config_item * item)140 static inline struct uvcg_mjpeg *to_uvcg_mjpeg(struct config_item *item)
141 {
142 return container_of(to_uvcg_format(item), struct uvcg_mjpeg, fmt);
143 }
144
145 /* -----------------------------------------------------------------------------
146 * control/extensions/<NAME>
147 */
148
149 struct uvcg_extension_unit_descriptor {
150 u8 bLength;
151 u8 bDescriptorType;
152 u8 bDescriptorSubType;
153 u8 bUnitID;
154 u8 guidExtensionCode[16];
155 u8 bNumControls;
156 u8 bNrInPins;
157 u8 *baSourceID;
158 u8 bControlSize;
159 u8 *bmControls;
160 u8 iExtension;
161 } __packed;
162
163 struct uvcg_extension {
164 struct config_item item;
165 struct list_head list;
166 u8 string_descriptor_index;
167 struct uvcg_extension_unit_descriptor desc;
168 };
169
to_uvcg_extension(struct config_item * item)170 static inline struct uvcg_extension *to_uvcg_extension(struct config_item *item)
171 {
172 return container_of(item, struct uvcg_extension, item);
173 }
174
175 int uvcg_attach_configfs(struct f_uvc_opts *opts);
176
177 #endif /* UVC_CONFIGFS_H */
178