drivers/hid/usbhid/usbhid.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef __USBHID_H
   3 #define __USBHID_H
   4
   5 /*
   6  *  Copyright (c) 1999 Andreas Gal
   7  *  Copyright (c) 2000-2001 Vojtech Pavlik
   8  *  Copyright (c) 2006 Jiri Kosina
   9  */
  10
  11 /*
  12  */
  13
  14 #include <linux/types.h>
  15 #include <linux/slab.h>
  16 #include <linux/list.h>
  17 #include <linux/mutex.h>
  18 #include <linux/timer.h>
  19 #include <linux/wait.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/input.h>
  22
  23 /*  API provided by hid-core.c for USB HID drivers */
  24 void usbhid_init_reports(struct hid_device *hid);
  25 struct usb_interface *usbhid_find_interface(int minor);
  26
  27 /* iofl flags */
  28 #define HID_CTRL_RUNNING        1
  29 #define HID_OUT_RUNNING         2
  30 #define HID_IN_RUNNING          3
  31 #define HID_RESET_PENDING       4
  32 #define HID_SUSPENDED           5
  33 #define HID_CLEAR_HALT          6
  34 #define HID_DISCONNECTED        7
  35 #define HID_STARTED             8
  36 #define HID_KEYS_PRESSED        10
  37 #define HID_NO_BANDWIDTH        11
  38 #define HID_RESUME_RUNNING      12
  39 /*
  40  * The device is opened, meaning there is a client that is interested
  41  * in data coming from the device.
  42  */
  43 #define HID_OPENED              13
  44 /*
  45  * We are polling input endpoint by [re]submitting IN URB, because
  46  * either HID device is opened or ALWAYS POLL quirk is set for the
  47  * device.
  48  */
  49 #define HID_IN_POLLING          14
  50
  51 /*
  52  * USB-specific HID struct, to be pointed to
  53  * from struct hid_device->driver_data
  54  */
  55
  56 struct usbhid_device {
  57         struct hid_device *hid;                                         /* pointer to corresponding HID dev */
  58
  59         struct usb_interface *intf;                                     /* USB interface */
  60         int ifnum;                                                      /* USB interface number */
  61
  62         unsigned int bufsize;                                           /* URB buffer size */
  63
  64         struct urb *urbin;                                              /* Input URB */
  65         char *inbuf;                                                    /* Input buffer */
  66         dma_addr_t inbuf_dma;                                           /* Input buffer dma */
  67
  68         struct urb *urbctrl;                                            /* Control URB */
  69         struct usb_ctrlrequest *cr;                                     /* Control request struct */
  70         struct hid_control_fifo ctrl[HID_CONTROL_FIFO_SIZE];            /* Control fifo */
  71         unsigned char ctrlhead, ctrltail;                               /* Control fifo head & tail */
  72         char *ctrlbuf;                                                  /* Control buffer */
  73         dma_addr_t ctrlbuf_dma;                                         /* Control buffer dma */
  74         unsigned long last_ctrl;                                                /* record of last output for timeouts */
  75
  76         struct urb *urbout;                                             /* Output URB */
  77         struct hid_output_fifo out[HID_CONTROL_FIFO_SIZE];              /* Output pipe fifo */
  78         unsigned char outhead, outtail;                                 /* Output pipe fifo head & tail */
  79         char *outbuf;                                                   /* Output buffer */
  80         dma_addr_t outbuf_dma;                                          /* Output buffer dma */
  81         unsigned long last_out;                                                 /* record of last output for timeouts */
  82
  83         struct mutex mutex;                                             /* start/stop/open/close */
  84         spinlock_t lock;                                                /* fifo spinlock */
  85         unsigned long iofl;                                             /* I/O flags (CTRL_RUNNING, OUT_RUNNING) */
  86         struct timer_list io_retry;                                     /* Retry timer */
  87         unsigned long stop_retry;                                       /* Time to give up, in jiffies */
  88         unsigned int retry_delay;                                       /* Delay length in ms */
  89         struct work_struct reset_work;                                  /* Task context for resets */
  90         wait_queue_head_t wait;                                         /* For sleeping */
  91 };
  92
  93 #define hid_to_usb_dev(hid_dev) \
  94         to_usb_device(hid_dev->dev.parent->parent)
  95
  96 #endif
  97