mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
06bb521911
Some devices of the "Speedlink VAD Cezanne" model need more aggressive fixing than already done. I made sure through testing that this patch would not interfere with the proper working of a device that is bug-free. (The driver drops EV_REL events with abs(val) >= 256, which are not achievable even on the highest laser resolution hardware setting.) Signed-off-by: Stefan Kriwanek <mail@stefankriwanek.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
81 lines
2.3 KiB
C
81 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, 2013 Stefan Kriwanek <dev@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 "hid-ids.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. */
|
|
|
|
/* This fixes the "jumpy" cursor occuring due to invalid events sent
|
|
* by the device. Some devices only send them with value==+256, others
|
|
* don't. However, catching abs(value)>=256 is restrictive enough not
|
|
* to interfere with devices that were bug-free (has been tested).
|
|
*/
|
|
if (abs(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,
|
|
};
|
|
module_hid_driver(speedlink_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|