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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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d313279228
usbhid tries to give the device 50 milliseconds to drain its queues when opening the device, but does it naively by simply sleeping in open handler, which slows down device probing (and thus may affect overall boot time). However we do not need to sleep as we can instead mark a point of time in the future when we should start processing the events. Reported-by: Nicolas Boichat <drinkcat@chromium.org> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Reviewed-by: Guenter Roeck <groeck@chromium.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
100 lines
3.7 KiB
C
100 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef __USBHID_H
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#define __USBHID_H
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/*
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* Copyright (c) 1999 Andreas Gal
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* Copyright (c) 2000-2001 Vojtech Pavlik
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* Copyright (c) 2006 Jiri Kosina
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*/
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/*
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*/
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/ktime.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/timer.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include <linux/input.h>
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/* API provided by hid-core.c for USB HID drivers */
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void usbhid_init_reports(struct hid_device *hid);
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struct usb_interface *usbhid_find_interface(int minor);
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/* iofl flags */
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#define HID_CTRL_RUNNING 1
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#define HID_OUT_RUNNING 2
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#define HID_IN_RUNNING 3
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#define HID_RESET_PENDING 4
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#define HID_SUSPENDED 5
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#define HID_CLEAR_HALT 6
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#define HID_DISCONNECTED 7
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#define HID_STARTED 8
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#define HID_KEYS_PRESSED 10
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#define HID_NO_BANDWIDTH 11
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#define HID_RESUME_RUNNING 12
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/*
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* The device is opened, meaning there is a client that is interested
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* in data coming from the device.
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*/
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#define HID_OPENED 13
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/*
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* We are polling input endpoint by [re]submitting IN URB, because
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* either HID device is opened or ALWAYS POLL quirk is set for the
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* device.
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*/
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#define HID_IN_POLLING 14
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/*
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* USB-specific HID struct, to be pointed to
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* from struct hid_device->driver_data
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*/
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struct usbhid_device {
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struct hid_device *hid; /* pointer to corresponding HID dev */
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struct usb_interface *intf; /* USB interface */
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int ifnum; /* USB interface number */
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unsigned int bufsize; /* URB buffer size */
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struct urb *urbin; /* Input URB */
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char *inbuf; /* Input buffer */
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dma_addr_t inbuf_dma; /* Input buffer dma */
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struct urb *urbctrl; /* Control URB */
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struct usb_ctrlrequest *cr; /* Control request struct */
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struct hid_control_fifo ctrl[HID_CONTROL_FIFO_SIZE]; /* Control fifo */
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unsigned char ctrlhead, ctrltail; /* Control fifo head & tail */
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char *ctrlbuf; /* Control buffer */
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dma_addr_t ctrlbuf_dma; /* Control buffer dma */
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unsigned long last_ctrl; /* record of last output for timeouts */
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struct urb *urbout; /* Output URB */
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struct hid_output_fifo out[HID_CONTROL_FIFO_SIZE]; /* Output pipe fifo */
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unsigned char outhead, outtail; /* Output pipe fifo head & tail */
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char *outbuf; /* Output buffer */
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dma_addr_t outbuf_dma; /* Output buffer dma */
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unsigned long last_out; /* record of last output for timeouts */
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struct mutex mutex; /* start/stop/open/close */
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spinlock_t lock; /* fifo spinlock */
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unsigned long iofl; /* I/O flags (CTRL_RUNNING, OUT_RUNNING) */
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ktime_t input_start_time; /* When to start handling input */
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struct timer_list io_retry; /* Retry timer */
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unsigned long stop_retry; /* Time to give up, in jiffies */
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unsigned int retry_delay; /* Delay length in ms */
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struct work_struct reset_work; /* Task context for resets */
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wait_queue_head_t wait; /* For sleeping */
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};
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#define hid_to_usb_dev(hid_dev) \
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to_usb_device(hid_dev->dev.parent->parent)
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#endif
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