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Linux/drivers/hid/hid-speedlink.c

  1 /*
  2  *  HID driver for Speedlink Vicious and Divine Cezanne (USB mouse).
  3  *  Fixes "jumpy" cursor and removes nonexistent keyboard LEDS from
  4  *  the HID descriptor.
  5  *
  6  *  Copyright (c) 2011, 2013 Stefan Kriwanek <dev@stefankriwanek.de>
  7  */
  8 
  9 /*
 10  * This program is free software; you can redistribute it and/or modify it
 11  * under the terms of the GNU General Public License as published by the Free
 12  * Software Foundation; either version 2 of the License, or (at your option)
 13  * any later version.
 14  */
 15 
 16 #include <linux/device.h>
 17 #include <linux/hid.h>
 18 #include <linux/module.h>
 19 
 20 #include "hid-ids.h"
 21 
 22 static const struct hid_device_id speedlink_devices[] = {
 23         { HID_USB_DEVICE(USB_VENDOR_ID_X_TENSIONS, USB_DEVICE_ID_SPEEDLINK_VAD_CEZANNE)},
 24         { }
 25 };
 26 
 27 static int speedlink_input_mapping(struct hid_device *hdev,
 28                 struct hid_input *hi,
 29                 struct hid_field *field, struct hid_usage *usage,
 30                 unsigned long **bit, int *max)
 31 {
 32         /*
 33          * The Cezanne mouse has a second "keyboard" USB endpoint for it is
 34          * able to map keyboard events to the button presses.
 35          * It sends a standard keyboard report descriptor, though, whose
 36          * LEDs we ignore.
 37          */
 38         switch (usage->hid & HID_USAGE_PAGE) {
 39         case HID_UP_LED:
 40                 return -1;
 41         }
 42         return 0;
 43 }
 44 
 45 static int speedlink_event(struct hid_device *hdev, struct hid_field *field,
 46                 struct hid_usage *usage, __s32 value)
 47 {
 48         /* No other conditions due to usage_table. */
 49 
 50         /* This fixes the "jumpy" cursor occuring due to invalid events sent
 51          * by the device. Some devices only send them with value==+256, others
 52          * don't. However, catching abs(value)>=256 is restrictive enough not
 53          * to interfere with devices that were bug-free (has been tested).
 54          */
 55         if (abs(value) >= 256)
 56                 return 1;
 57         /* Drop useless distance 0 events (on button clicks etc.) as well */
 58         if (value == 0)
 59                 return 1;
 60 
 61         return 0;
 62 }
 63 
 64 MODULE_DEVICE_TABLE(hid, speedlink_devices);
 65 
 66 static const struct hid_usage_id speedlink_grabbed_usages[] = {
 67         { HID_GD_X, EV_REL, 0 },
 68         { HID_GD_Y, EV_REL, 1 },
 69         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
 70 };
 71 
 72 static struct hid_driver speedlink_driver = {
 73         .name = "speedlink",
 74         .id_table = speedlink_devices,
 75         .usage_table = speedlink_grabbed_usages,
 76         .input_mapping = speedlink_input_mapping,
 77         .event = speedlink_event,
 78 };
 79 module_hid_driver(speedlink_driver);
 80 
 81 MODULE_LICENSE("GPL");
 82 

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