forked from luck/tmp_suning_uos_patched
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>
90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
/*
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* HID driver for Speedlink Vicious and Divine Cezanne (USB mouse).
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* Fixes "jumpy" cursor and removes nonexistent keyboard LEDS from
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* the HID descriptor.
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*
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* Copyright (c) 2011 Stefan Kriwanek <mail@stefankriwanek.de>
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include "hid-ids.h"
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#include "usbhid/usbhid.h"
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static const struct hid_device_id speedlink_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_X_TENSIONS, USB_DEVICE_ID_SPEEDLINK_VAD_CEZANNE)},
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{ }
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};
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static int speedlink_input_mapping(struct hid_device *hdev,
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struct hid_input *hi,
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struct hid_field *field, struct hid_usage *usage,
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unsigned long **bit, int *max)
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{
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/*
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* The Cezanne mouse has a second "keyboard" USB endpoint for it is
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* able to map keyboard events to the button presses.
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* It sends a standard keyboard report descriptor, though, whose
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* LEDs we ignore.
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*/
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switch (usage->hid & HID_USAGE_PAGE) {
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case HID_UP_LED:
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return -1;
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}
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return 0;
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}
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static int speedlink_event(struct hid_device *hdev, struct hid_field *field,
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struct hid_usage *usage, __s32 value)
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{
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/* No other conditions due to usage_table. */
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/* Fix "jumpy" cursor (invalid events sent by device). */
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if (value == 256)
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return 1;
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/* Drop useless distance 0 events (on button clicks etc.) as well */
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if (value == 0)
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return 1;
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return 0;
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}
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MODULE_DEVICE_TABLE(hid, speedlink_devices);
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static const struct hid_usage_id speedlink_grabbed_usages[] = {
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{ HID_GD_X, EV_REL, 0 },
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{ HID_GD_Y, EV_REL, 1 },
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{ HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
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};
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static struct hid_driver speedlink_driver = {
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.name = "speedlink",
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.id_table = speedlink_devices,
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.usage_table = speedlink_grabbed_usages,
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.input_mapping = speedlink_input_mapping,
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.event = speedlink_event,
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};
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static int __init speedlink_init(void)
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{
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return hid_register_driver(&speedlink_driver);
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}
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static void __exit speedlink_exit(void)
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{
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hid_unregister_driver(&speedlink_driver);
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}
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module_init(speedlink_init);
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module_exit(speedlink_exit);
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MODULE_LICENSE("GPL");
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