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 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 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