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-cherry.c (1890B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  HID driver for some cherry "special" devices
      4 *
      5 *  Copyright (c) 1999 Andreas Gal
      6 *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
      7 *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
      8 *  Copyright (c) 2006-2007 Jiri Kosina
      9 *  Copyright (c) 2008 Jiri Slaby
     10 */
     11
     12/*
     13 */
     14
     15#include <linux/device.h>
     16#include <linux/hid.h>
     17#include <linux/module.h>
     18
     19#include "hid-ids.h"
     20
     21/*
     22 * Cherry Cymotion keyboard have an invalid HID report descriptor,
     23 * that needs fixing before we can parse it.
     24 */
     25static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
     26		unsigned int *rsize)
     27{
     28	if (*rsize >= 18 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
     29		hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");
     30		rdesc[11] = rdesc[16] = 0xff;
     31		rdesc[12] = rdesc[17] = 0x03;
     32	}
     33	return rdesc;
     34}
     35
     36#define ch_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, max, \
     37					EV_KEY, (c))
     38static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
     39		struct hid_field *field, struct hid_usage *usage,
     40		unsigned long **bit, int *max)
     41{
     42	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
     43		return 0;
     44
     45	switch (usage->hid & HID_USAGE) {
     46	case 0x301: ch_map_key_clear(KEY_PROG1);	break;
     47	case 0x302: ch_map_key_clear(KEY_PROG2);	break;
     48	case 0x303: ch_map_key_clear(KEY_PROG3);	break;
     49	default:
     50		return 0;
     51	}
     52
     53	return 1;
     54}
     55
     56static const struct hid_device_id ch_devices[] = {
     57	{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
     58	{ HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) },
     59	{ }
     60};
     61MODULE_DEVICE_TABLE(hid, ch_devices);
     62
     63static struct hid_driver ch_driver = {
     64	.name = "cherry",
     65	.id_table = ch_devices,
     66	.report_fixup = ch_report_fixup,
     67	.input_mapping = ch_input_mapping,
     68};
     69module_hid_driver(ch_driver);
     70
     71MODULE_LICENSE("GPL");