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The video control and video streaming interface numbers are needed in the UVC gadget userspace stack to reply to UVC requests. They are hardcoded to fixed values at the moment, preventing configurations with multiple functions. To fix this, make them dynamically discoverable by userspace through read-only configfs attributes in <function>/control/bInterfaceNumber and <function>/streaming/bInterfaceNumber respectively. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* u_uvc.h
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*
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* Utility definitions for the uvc function
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*
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* Copyright (c) 2013-2014 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
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*/
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#ifndef U_UVC_H
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#define U_UVC_H
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#include <linux/mutex.h>
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#include <linux/usb/composite.h>
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#include <linux/usb/video.h>
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#define fi_to_f_uvc_opts(f) container_of(f, struct f_uvc_opts, func_inst)
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struct f_uvc_opts {
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struct usb_function_instance func_inst;
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unsigned int streaming_interval;
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unsigned int streaming_maxpacket;
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unsigned int streaming_maxburst;
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unsigned int control_interface;
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unsigned int streaming_interface;
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/*
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* Control descriptors array pointers for full-/high-speed and
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* super-speed. They point by default to the uvc_fs_control_cls and
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* uvc_ss_control_cls arrays respectively. Legacy gadgets must
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* override them in their gadget bind callback.
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*/
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const struct uvc_descriptor_header * const *fs_control;
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const struct uvc_descriptor_header * const *ss_control;
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/*
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* Streaming descriptors array pointers for full-speed, high-speed and
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* super-speed. They will point to the uvc_[fhs]s_streaming_cls arrays
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* for configfs-based gadgets. Legacy gadgets must initialize them in
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* their gadget bind callback.
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*/
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const struct uvc_descriptor_header * const *fs_streaming;
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const struct uvc_descriptor_header * const *hs_streaming;
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const struct uvc_descriptor_header * const *ss_streaming;
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/* Default control descriptors for configfs-based gadgets. */
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struct uvc_camera_terminal_descriptor uvc_camera_terminal;
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struct uvc_processing_unit_descriptor uvc_processing;
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struct uvc_output_terminal_descriptor uvc_output_terminal;
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struct uvc_color_matching_descriptor uvc_color_matching;
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/*
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* Control descriptors pointers arrays for full-/high-speed and
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* super-speed. The first element is a configurable control header
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* descriptor, the other elements point to the fixed default control
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* descriptors. Used by configfs only, must not be touched by legacy
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* gadgets.
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*/
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struct uvc_descriptor_header *uvc_fs_control_cls[5];
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struct uvc_descriptor_header *uvc_ss_control_cls[5];
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/*
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* Streaming descriptors for full-speed, high-speed and super-speed.
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* Used by configfs only, must not be touched by legacy gadgets. The
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* arrays are allocated at runtime as the number of descriptors isn't
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* known in advance.
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*/
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struct uvc_descriptor_header **uvc_fs_streaming_cls;
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struct uvc_descriptor_header **uvc_hs_streaming_cls;
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struct uvc_descriptor_header **uvc_ss_streaming_cls;
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/*
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* Read/write access to configfs attributes is handled by configfs.
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*
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* This lock protects the descriptors from concurrent access by
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* read/write and symlink creation/removal.
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*/
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struct mutex lock;
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int refcnt;
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};
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#endif /* U_UVC_H */
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