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43cd002387
This patch changes the function uvc_video_pump to be a separate scheduled worker. This way the completion handler of each usb request and every direct caller of the pump has only to schedule the worker instead of doing the request handling by itself. Moving the request handling to one thread solves the locking problems between the three queueing cases in the completion handler, v4l2_qbuf and video_enable. Many drivers handle the completion handlers directly in their interrupt handlers. This patch also reduces the workload on each interrupt. Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de> Signed-off-by: Felipe Balbi <balbi@kernel.org>
165 lines
4.1 KiB
C
165 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* uvc_gadget.h -- USB Video Class Gadget driver
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*
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* Copyright (C) 2009-2010
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* Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#ifndef _UVC_GADGET_H_
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#define _UVC_GADGET_H_
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include <linux/usb/composite.h>
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#include <linux/videodev2.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-fh.h>
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#include "uvc_queue.h"
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struct usb_ep;
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struct usb_request;
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struct uvc_descriptor_header;
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struct uvc_device;
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/* ------------------------------------------------------------------------
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* Debugging, printing and logging
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*/
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#define UVC_TRACE_PROBE (1 << 0)
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#define UVC_TRACE_DESCR (1 << 1)
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#define UVC_TRACE_CONTROL (1 << 2)
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#define UVC_TRACE_FORMAT (1 << 3)
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#define UVC_TRACE_CAPTURE (1 << 4)
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#define UVC_TRACE_CALLS (1 << 5)
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#define UVC_TRACE_IOCTL (1 << 6)
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#define UVC_TRACE_FRAME (1 << 7)
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#define UVC_TRACE_SUSPEND (1 << 8)
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#define UVC_TRACE_STATUS (1 << 9)
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#define UVC_WARN_MINMAX 0
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#define UVC_WARN_PROBE_DEF 1
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extern unsigned int uvc_gadget_trace_param;
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#define uvc_trace(flag, msg...) \
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do { \
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if (uvc_gadget_trace_param & flag) \
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printk(KERN_DEBUG "uvcvideo: " msg); \
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} while (0)
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#define uvcg_dbg(f, fmt, args...) \
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dev_dbg(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
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#define uvcg_info(f, fmt, args...) \
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dev_info(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
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#define uvcg_warn(f, fmt, args...) \
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dev_warn(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
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#define uvcg_err(f, fmt, args...) \
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dev_err(&(f)->config->cdev->gadget->dev, "%s: " fmt, (f)->name, ##args)
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/* ------------------------------------------------------------------------
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* Driver specific constants
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*/
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#define UVC_NUM_REQUESTS 4
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#define UVC_MAX_REQUEST_SIZE 64
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#define UVC_MAX_EVENTS 4
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/* ------------------------------------------------------------------------
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* Structures
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*/
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struct uvc_video {
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struct uvc_device *uvc;
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struct usb_ep *ep;
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struct work_struct pump;
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/* Frame parameters */
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u8 bpp;
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u32 fcc;
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unsigned int width;
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unsigned int height;
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unsigned int imagesize;
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struct mutex mutex; /* protects frame parameters */
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/* Requests */
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unsigned int req_size;
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struct usb_request *req[UVC_NUM_REQUESTS];
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__u8 *req_buffer[UVC_NUM_REQUESTS];
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struct list_head req_free;
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spinlock_t req_lock;
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void (*encode) (struct usb_request *req, struct uvc_video *video,
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struct uvc_buffer *buf);
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/* Context data used by the completion handler */
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__u32 payload_size;
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__u32 max_payload_size;
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struct uvc_video_queue queue;
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unsigned int fid;
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};
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enum uvc_state {
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UVC_STATE_DISCONNECTED,
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UVC_STATE_CONNECTED,
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UVC_STATE_STREAMING,
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};
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struct uvc_device {
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struct video_device vdev;
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struct v4l2_device v4l2_dev;
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enum uvc_state state;
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struct usb_function func;
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struct uvc_video video;
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/* Descriptors */
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struct {
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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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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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} desc;
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unsigned int control_intf;
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struct usb_ep *control_ep;
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struct usb_request *control_req;
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void *control_buf;
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unsigned int streaming_intf;
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/* Events */
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unsigned int event_length;
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unsigned int event_setup_out : 1;
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};
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static inline struct uvc_device *to_uvc(struct usb_function *f)
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{
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return container_of(f, struct uvc_device, func);
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}
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struct uvc_file_handle {
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struct v4l2_fh vfh;
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struct uvc_video *device;
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};
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#define to_uvc_file_handle(handle) \
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container_of(handle, struct uvc_file_handle, vfh)
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/* ------------------------------------------------------------------------
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* Functions
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*/
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extern void uvc_function_setup_continue(struct uvc_device *uvc);
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extern void uvc_endpoint_stream(struct uvc_device *dev);
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extern void uvc_function_connect(struct uvc_device *uvc);
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extern void uvc_function_disconnect(struct uvc_device *uvc);
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#endif /* _UVC_GADGET_H_ */
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