drivers/usb/gadget/function/u_uvc.h

   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 */