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/* SPDX-License-Identifier: GPL-2.0 */
/*
* u_uvc.h
*
* Utility definitions for the uvc function
*
* Copyright (c) 2013-2014 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* Author: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
*/
#ifndef U_UVC_H
#define U_UVC_H
#include <linux/mutex.h>
#include <linux/usb/composite.h>
#include <linux/usb/video.h>
#define fi_to_f_uvc_opts(f) container_of(f, struct f_uvc_opts, func_inst)
struct f_uvc_opts {
struct usb_function_instance func_inst;
unsigned int streaming_interval;
unsigned int streaming_maxpacket;
unsigned int streaming_maxburst;
unsigned int control_interface;
unsigned int streaming_interface;
char function_name[32];
unsigned int last_unit_id;
bool enable_interrupt_ep;
/*
* Control descriptors array pointers for full-/high-speed and
* super-speed. They point by default to the uvc_fs_control_cls and
* uvc_ss_control_cls arrays respectively. Legacy gadgets must
* override them in their gadget bind callback.
*/
const struct uvc_descriptor_header * const *fs_control;
const struct uvc_descriptor_header * const *ss_control;
/*
* Streaming descriptors array pointers for full-speed, high-speed and
* super-speed. They will point to the uvc_[fhs]s_streaming_cls arrays
* for configfs-based gadgets. Legacy gadgets must initialize them in
* their gadget bind callback.
*/
const struct uvc_descriptor_header * const *fs_streaming;
const struct uvc_descriptor_header * const *hs_streaming;
const struct uvc_descriptor_header * const *ss_streaming;
/* Default control descriptors for configfs-based gadgets. */
struct uvc_camera_terminal_descriptor uvc_camera_terminal;
struct uvc_processing_unit_descriptor uvc_processing;
struct uvc_output_terminal_descriptor uvc_output_terminal;
/*
* Control descriptors pointers arrays for full-/high-speed and
* super-speed. The first element is a configurable control header
* descriptor, the other elements point to the fixed default control
* descriptors. Used by configfs only, must not be touched by legacy
* gadgets.
*/
struct uvc_descriptor_header *uvc_fs_control_cls[5];
struct uvc_descriptor_header *uvc_ss_control_cls[5];
/*
* Control descriptors for extension units. There could be any number
* of these, including none at all.
*/
struct list_head extension_units;
/*
* Streaming descriptors for full-speed, high-speed and super-speed.
* Used by configfs only, must not be touched by legacy gadgets. The
* arrays are allocated at runtime as the number of descriptors isn't
* known in advance.
*/
struct uvc_descriptor_header **uvc_fs_streaming_cls;
struct uvc_descriptor_header **uvc_hs_streaming_cls;
struct uvc_descriptor_header **uvc_ss_streaming_cls;
/*
* Indexes into the function's string descriptors allowing users to set
* custom descriptions rather than the hard-coded defaults.
*/
u8 iad_index;
u8 vs0_index;
u8 vs1_index;
/*
* Read/write access to configfs attributes is handled by configfs.
*
* This lock protects the descriptors from concurrent access by
* read/write and symlink creation/removal.
*/
struct mutex lock;
int refcnt;
/*
* Only for legacy gadget. Shall be NULL for configfs-composed gadgets,
* which is guaranteed by alloc_inst implementation of f_uvc doing kzalloc.
*/
struct uvcg_streaming_header *header;
};
#endif /* U_UVC_H */
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