74bc695313
Speedlink VAD Cezanne have a hardware bug that makes the cursor "jump" from one place to another every now and then. The issue are relative motion events erroneously reported by the device, each having a distance value of +256. This 256 can in fact never occur due to real motion, therefore those events can safely be ignored. The driver also drops useless EV_REL events with a value of 0, that the device sends every time it sends an "real" EV_REL or EV_KEY event. Signed-off-by: Stefan Kriwanek <mail@stefankriwanek.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/*
|
|
* HID driver for Speedlink Vicious and Divine Cezanne (USB mouse).
|
|
* Fixes "jumpy" cursor and removes nonexistent keyboard LEDS from
|
|
* the HID descriptor.
|
|
*
|
|
* Copyright (c) 2011 Stefan Kriwanek <mail@stefankriwanek.de>
|
|
*/
|
|
|
|
/*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/hid.h>
|
|
#include <linux/module.h>
|
|
#include <linux/usb.h>
|
|
|
|
#include "hid-ids.h"
|
|
#include "usbhid/usbhid.h"
|
|
|
|
static const struct hid_device_id speedlink_devices[] = {
|
|
{ HID_USB_DEVICE(USB_VENDOR_ID_X_TENSIONS, USB_DEVICE_ID_SPEEDLINK_VAD_CEZANNE)},
|
|
{ }
|
|
};
|
|
|
|
static int speedlink_input_mapping(struct hid_device *hdev,
|
|
struct hid_input *hi,
|
|
struct hid_field *field, struct hid_usage *usage,
|
|
unsigned long **bit, int *max)
|
|
{
|
|
/*
|
|
* The Cezanne mouse has a second "keyboard" USB endpoint for it is
|
|
* able to map keyboard events to the button presses.
|
|
* It sends a standard keyboard report descriptor, though, whose
|
|
* LEDs we ignore.
|
|
*/
|
|
switch (usage->hid & HID_USAGE_PAGE) {
|
|
case HID_UP_LED:
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int speedlink_event(struct hid_device *hdev, struct hid_field *field,
|
|
struct hid_usage *usage, __s32 value)
|
|
{
|
|
/* No other conditions due to usage_table. */
|
|
/* Fix "jumpy" cursor (invalid events sent by device). */
|
|
if (value == 256)
|
|
return 1;
|
|
/* Drop useless distance 0 events (on button clicks etc.) as well */
|
|
if (value == 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
MODULE_DEVICE_TABLE(hid, speedlink_devices);
|
|
|
|
static const struct hid_usage_id speedlink_grabbed_usages[] = {
|
|
{ HID_GD_X, EV_REL, 0 },
|
|
{ HID_GD_Y, EV_REL, 1 },
|
|
{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
|
|
};
|
|
|
|
static struct hid_driver speedlink_driver = {
|
|
.name = "speedlink",
|
|
.id_table = speedlink_devices,
|
|
.usage_table = speedlink_grabbed_usages,
|
|
.input_mapping = speedlink_input_mapping,
|
|
.event = speedlink_event,
|
|
};
|
|
|
|
static int __init speedlink_init(void)
|
|
{
|
|
return hid_register_driver(&speedlink_driver);
|
|
}
|
|
|
|
static void __exit speedlink_exit(void)
|
|
{
|
|
hid_unregister_driver(&speedlink_driver);
|
|
}
|
|
|
|
module_init(speedlink_init);
|
|
module_exit(speedlink_exit);
|
|
MODULE_LICENSE("GPL");
|