cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hid-glorious.c (2122B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  USB HID driver for Glorious PC Gaming Race
      4 *  Glorious Model O, O- and D mice.
      5 *
      6 *  Copyright (c) 2020 Samuel Čavoj <sammko@sammserver.com>
      7 */
      8
      9/*
     10 */
     11
     12#include <linux/hid.h>
     13#include <linux/module.h>
     14
     15#include "hid-ids.h"
     16
     17MODULE_AUTHOR("Samuel Čavoj <sammko@sammserver.com>");
     18MODULE_DESCRIPTION("HID driver for Glorious PC Gaming Race mice");
     19
     20/*
     21 * Glorious Model O and O- specify the const flag in the consumer input
     22 * report descriptor, which leads to inputs being ignored. Fix this
     23 * by patching the descriptor.
     24 */
     25static __u8 *glorious_report_fixup(struct hid_device *hdev, __u8 *rdesc,
     26		unsigned int *rsize)
     27{
     28	if (*rsize == 213 &&
     29		rdesc[84] == 129 && rdesc[112] == 129 && rdesc[140] == 129 &&
     30		rdesc[85] == 3   && rdesc[113] == 3   && rdesc[141] == 3) {
     31		hid_info(hdev, "patching Glorious Model O consumer control report descriptor\n");
     32		rdesc[85] = rdesc[113] = rdesc[141] = \
     33			HID_MAIN_ITEM_VARIABLE | HID_MAIN_ITEM_RELATIVE;
     34	}
     35	return rdesc;
     36}
     37
     38static void glorious_update_name(struct hid_device *hdev)
     39{
     40	const char *model = "Device";
     41
     42	switch (hdev->product) {
     43	case USB_DEVICE_ID_GLORIOUS_MODEL_O:
     44		model = "Model O"; break;
     45	case USB_DEVICE_ID_GLORIOUS_MODEL_D:
     46		model = "Model D"; break;
     47	}
     48
     49	snprintf(hdev->name, sizeof(hdev->name), "%s %s", "Glorious", model);
     50}
     51
     52static int glorious_probe(struct hid_device *hdev,
     53		const struct hid_device_id *id)
     54{
     55	int ret;
     56
     57	hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
     58
     59	ret = hid_parse(hdev);
     60	if (ret)
     61		return ret;
     62
     63	glorious_update_name(hdev);
     64
     65	return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
     66}
     67
     68static const struct hid_device_id glorious_devices[] = {
     69	{ HID_USB_DEVICE(USB_VENDOR_ID_GLORIOUS,
     70		USB_DEVICE_ID_GLORIOUS_MODEL_O) },
     71	{ HID_USB_DEVICE(USB_VENDOR_ID_GLORIOUS,
     72		USB_DEVICE_ID_GLORIOUS_MODEL_D) },
     73	{ }
     74};
     75MODULE_DEVICE_TABLE(hid, glorious_devices);
     76
     77static struct hid_driver glorious_driver = {
     78	.name = "glorious",
     79	.id_table = glorious_devices,
     80	.probe = glorious_probe,
     81	.report_fixup = glorious_report_fixup
     82};
     83
     84module_hid_driver(glorious_driver);
     85
     86MODULE_LICENSE("GPL");