diff options
Diffstat (limited to 'drivers/hid/hid-speedlink.c')
| -rw-r--r-- | drivers/hid/hid-speedlink.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/hid/hid-speedlink.c b/drivers/hid/hid-speedlink.c index a2f587d004e1..22ee078c42c6 100644 --- a/drivers/hid/hid-speedlink.c +++ b/drivers/hid/hid-speedlink.c @@ -1,16 +1,13 @@ +// 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 Stefan Kriwanek <mail@stefankriwanek.de> + * 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> @@ -46,8 +43,13 @@ 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) + + /* 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) @@ -73,4 +75,5 @@ static struct hid_driver speedlink_driver = { }; module_hid_driver(speedlink_driver); +MODULE_DESCRIPTION("HID driver for Speedlink Vicious and Divine Cezanne (USB mouse)"); MODULE_LICENSE("GPL"); |