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