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