https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: fd6988496e79a6a4bdb514a4655d2920209eb85d authored by Linus Torvalds on 29 December 2019, 23:29:16 UTC
Linux 5.5-rc4
Linux 5.5-rc4
Tip revision: fd69884
hid-speedlink.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
/*
*/
#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");