diff options
Diffstat (limited to 'drivers/usb/gadget/function/u_uvc.h')
| -rw-r--r-- | drivers/usb/gadget/function/u_uvc.h | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/u_uvc.h b/drivers/usb/gadget/function/u_uvc.h new file mode 100644 index 0000000000..3ac392cbb7 --- /dev/null +++ b/drivers/usb/gadget/function/u_uvc.h @@ -0,0 +1,109 @@ +/* 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 */ |