projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 41de326e CO |
1 | /* |
| 2 | * HID driver for Holtek gaming mice | |
| 3 | * Copyright (c) 2013 Christian Ohm | |
| 4 | * Heavily inspired by various other HID drivers that adjust the report | |
| 5 | * descriptor. | |
| 6 | */ | |
| 7 | ||
| 8 | /* | |
| 9 | * This program is free software; you can redistribute it and/or modify it | |
| 10 | * under the terms of the GNU General Public License as published by the Free | |
| 11 | * Software Foundation; either version 2 of the License, or (at your option) | |
| 12 | * any later version. | |
| 13 | */ | |
| 14 | ||
| 15 | #include <linux/hid.h> | |
| 16 | #include <linux/module.h> | |
| 17 | #include <linux/usb.h> | |
| 18 | ||
| 19 | #include "hid-ids.h" | |
| 20 | ||
| 21 | /* | |
| 22 | * The report descriptor of some Holtek based gaming mice specifies an | |
| 23 | * excessively large number of consumer usages (2^15), which is more than | |
| 24 | * HID_MAX_USAGES. This prevents proper parsing of the report descriptor. | |
| 25 | * | |
| 26 | * This driver fixes the report descriptor for USB ID 04d9:a067, sold as | |
| 27 | * Sharkoon Drakonia and Perixx MX-2000. | |
| 28 | */ | |
| 29 | ||
| 30 | static __u8 *holtek_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc, | |
| 31 | unsigned int *rsize) | |
| 32 | { | |
| 33 | struct usb_interface *intf = to_usb_interface(hdev->dev.parent); | |
| 34 | ||
| 35 | if (intf->cur_altsetting->desc.bInterfaceNumber == 1) { | |
| 36 | /* Change usage maximum and logical maximum from 0x7fff to | |
| 37 | * 0x2fff, so they don't exceed HID_MAX_USAGES */ | |
| 38 | if (*rsize >= 122 && rdesc[115] == 0xff && rdesc[116] == 0x7f | |
| 39 | && rdesc[120] == 0xff && rdesc[121] == 0x7f) { | |
| 40 | hid_info(hdev, "Fixing up report descriptor\n"); | |
| 41 | rdesc[116] = rdesc[121] = 0x2f; | |
| 42 | } | |
| 43 | } | |
| 44 | return rdesc; | |
| 45 | } | |
| 46 | ||
| 47 | static const struct hid_device_id holtek_mouse_devices[] = { | |
| 48 | { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT, | |
| 49 | USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) }, | |
| 50 | { } | |
| 51 | }; | |
| 52 | MODULE_DEVICE_TABLE(hid, holtek_mouse_devices); | |
| 53 | ||
| 54 | static struct hid_driver holtek_mouse_driver = { | |
| 55 | .name = "holtek_mouse", | |
| 56 | .id_table = holtek_mouse_devices, | |
| 57 | .report_fixup = holtek_mouse_report_fixup, | |
| 58 | }; | |
| 59 | ||
| 60 | static int __init holtek_mouse_init(void) | |
| 61 | { | |
| 62 | return hid_register_driver(&holtek_mouse_driver); | |
| 63 | } | |
| 64 | ||
| 65 | static void __exit holtek_mouse_exit(void) | |
| 66 | { | |
| 67 | hid_unregister_driver(&holtek_mouse_driver); | |
| 68 | } | |
| 69 | ||
| 70 | module_exit(holtek_mouse_exit); | |
| 71 | module_init(holtek_mouse_init); | |
| 72 | MODULE_LICENSE("GPL"); |