1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * u_uvc.h 4 * 5 * Utility definitions for the uvc function 6 * 7 * Copyright (c) 2013-2014 Samsung Electronics Co., Ltd. 8 * http://www.samsung.com 9 * 10 * Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com> 11 */ 12 13 #ifndef U_UVC_H 14 #define U_UVC_H 15 16 #include <linux/mutex.h> 17 #include <linux/usb/composite.h> 18 #include <linux/usb/video.h> 19 20 #define fi_to_f_uvc_opts(f) container_of(f, struct f_uvc_opts, func_inst) 21 22 struct f_uvc_opts { 23 struct usb_function_instance func_inst; 24 unsigned int streaming_interval; 25 unsigned int streaming_maxpacket; 26 unsigned int streaming_maxburst; 27 28 unsigned int control_interface; 29 unsigned int streaming_interface; 30 31 /* 32 * Control descriptors array pointers for full-/high-speed and 33 * super-speed. They point by default to the uvc_fs_control_cls and 34 * uvc_ss_control_cls arrays respectively. Legacy gadgets must 35 * override them in their gadget bind callback. 36 */ 37 const struct uvc_descriptor_header * const *fs_control; 38 const struct uvc_descriptor_header * const *ss_control; 39 40 /* 41 * Streaming descriptors array pointers for full-speed, high-speed and 42 * super-speed. They will point to the uvc_[fhs]s_streaming_cls arrays 43 * for configfs-based gadgets. Legacy gadgets must initialize them in 44 * their gadget bind callback. 45 */ 46 const struct uvc_descriptor_header * const *fs_streaming; 47 const struct uvc_descriptor_header * const *hs_streaming; 48 const struct uvc_descriptor_header * const *ss_streaming; 49 50 /* Default control descriptors for configfs-based gadgets. */ 51 struct uvc_camera_terminal_descriptor uvc_camera_terminal; 52 struct uvc_processing_unit_descriptor uvc_processing; 53 struct uvc_output_terminal_descriptor uvc_output_terminal; 54 struct uvc_color_matching_descriptor uvc_color_matching; 55 56 /* 57 * Control descriptors pointers arrays for full-/high-speed and 58 * super-speed. The first element is a configurable control header 59 * descriptor, the other elements point to the fixed default control 60 * descriptors. Used by configfs only, must not be touched by legacy 61 * gadgets. 62 */ 63 struct uvc_descriptor_header *uvc_fs_control_cls[5]; 64 struct uvc_descriptor_header *uvc_ss_control_cls[5]; 65 66 /* 67 * Streaming descriptors for full-speed, high-speed and super-speed. 68 * Used by configfs only, must not be touched by legacy gadgets. The 69 * arrays are allocated at runtime as the number of descriptors isn't 70 * known in advance. 71 */ 72 struct uvc_descriptor_header **uvc_fs_streaming_cls; 73 struct uvc_descriptor_header **uvc_hs_streaming_cls; 74 struct uvc_descriptor_header **uvc_ss_streaming_cls; 75 76 /* 77 * Read/write access to configfs attributes is handled by configfs. 78 * 79 * This lock protects the descriptors from concurrent access by 80 * read/write and symlink creation/removal. 81 */ 82 struct mutex lock; 83 int refcnt; 84 }; 85 86 #endif /* U_UVC_H */ 87