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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * HID driver for Speedlink Vicious and Divine Cezanne (USB mouse).4 * Fixes "jumpy" cursor and removes nonexistent keyboard LEDS from5 * 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 19static 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 24static 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 is31 * able to map keyboard events to the button presses.32 * It sends a standard keyboard report descriptor, though, whose33 * 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 42static 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 sent48 * by the device. Some devices only send them with value==+256, others49 * don't. However, catching abs(value)>=256 is restrictive enough not50 * 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 61MODULE_DEVICE_TABLE(hid, speedlink_devices);62 63static 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 69static 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};76module_hid_driver(speedlink_driver);77 78MODULE_DESCRIPTION("HID driver for Speedlink Vicious and Divine Cezanne (USB mouse)");79MODULE_LICENSE("GPL");80