1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * HID driver for Speedlink Vicious and Divine Cezanne (USB mouse).
4*4882a593Smuzhiyun * Fixes "jumpy" cursor and removes nonexistent keyboard LEDS from
5*4882a593Smuzhiyun * the HID descriptor.
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright (c) 2011, 2013 Stefan Kriwanek <dev@stefankriwanek.de>
8*4882a593Smuzhiyun */
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun /*
11*4882a593Smuzhiyun */
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun #include <linux/device.h>
14*4882a593Smuzhiyun #include <linux/hid.h>
15*4882a593Smuzhiyun #include <linux/module.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include "hid-ids.h"
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun static const struct hid_device_id speedlink_devices[] = {
20*4882a593Smuzhiyun { HID_USB_DEVICE(USB_VENDOR_ID_X_TENSIONS, USB_DEVICE_ID_SPEEDLINK_VAD_CEZANNE)},
21*4882a593Smuzhiyun { }
22*4882a593Smuzhiyun };
23*4882a593Smuzhiyun
speedlink_input_mapping(struct hid_device * hdev,struct hid_input * hi,struct hid_field * field,struct hid_usage * usage,unsigned long ** bit,int * max)24*4882a593Smuzhiyun static int speedlink_input_mapping(struct hid_device *hdev,
25*4882a593Smuzhiyun struct hid_input *hi,
26*4882a593Smuzhiyun struct hid_field *field, struct hid_usage *usage,
27*4882a593Smuzhiyun unsigned long **bit, int *max)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun /*
30*4882a593Smuzhiyun * The Cezanne mouse has a second "keyboard" USB endpoint for it is
31*4882a593Smuzhiyun * able to map keyboard events to the button presses.
32*4882a593Smuzhiyun * It sends a standard keyboard report descriptor, though, whose
33*4882a593Smuzhiyun * LEDs we ignore.
34*4882a593Smuzhiyun */
35*4882a593Smuzhiyun switch (usage->hid & HID_USAGE_PAGE) {
36*4882a593Smuzhiyun case HID_UP_LED:
37*4882a593Smuzhiyun return -1;
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun return 0;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
speedlink_event(struct hid_device * hdev,struct hid_field * field,struct hid_usage * usage,__s32 value)42*4882a593Smuzhiyun static int speedlink_event(struct hid_device *hdev, struct hid_field *field,
43*4882a593Smuzhiyun struct hid_usage *usage, __s32 value)
44*4882a593Smuzhiyun {
45*4882a593Smuzhiyun /* No other conditions due to usage_table. */
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun /* This fixes the "jumpy" cursor occuring due to invalid events sent
48*4882a593Smuzhiyun * by the device. Some devices only send them with value==+256, others
49*4882a593Smuzhiyun * don't. However, catching abs(value)>=256 is restrictive enough not
50*4882a593Smuzhiyun * to interfere with devices that were bug-free (has been tested).
51*4882a593Smuzhiyun */
52*4882a593Smuzhiyun if (abs(value) >= 256)
53*4882a593Smuzhiyun return 1;
54*4882a593Smuzhiyun /* Drop useless distance 0 events (on button clicks etc.) as well */
55*4882a593Smuzhiyun if (value == 0)
56*4882a593Smuzhiyun return 1;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun return 0;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun MODULE_DEVICE_TABLE(hid, speedlink_devices);
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun static const struct hid_usage_id speedlink_grabbed_usages[] = {
64*4882a593Smuzhiyun { HID_GD_X, EV_REL, 0 },
65*4882a593Smuzhiyun { HID_GD_Y, EV_REL, 1 },
66*4882a593Smuzhiyun { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
67*4882a593Smuzhiyun };
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun static struct hid_driver speedlink_driver = {
70*4882a593Smuzhiyun .name = "speedlink",
71*4882a593Smuzhiyun .id_table = speedlink_devices,
72*4882a593Smuzhiyun .usage_table = speedlink_grabbed_usages,
73*4882a593Smuzhiyun .input_mapping = speedlink_input_mapping,
74*4882a593Smuzhiyun .event = speedlink_event,
75*4882a593Smuzhiyun };
76*4882a593Smuzhiyun module_hid_driver(speedlink_driver);
77*4882a593Smuzhiyun
78*4882a593Smuzhiyun MODULE_LICENSE("GPL");
79