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-ezkey.c (2043B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  HID driver for some ezkey "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/input.h>
     17#include <linux/hid.h>
     18#include <linux/module.h>
     19
     20#include "hid-ids.h"
     21
     22#define ez_map_rel(c)	hid_map_usage(hi, usage, bit, max, EV_REL, (c))
     23#define ez_map_key(c)	hid_map_usage(hi, usage, bit, max, EV_KEY, (c))
     24
     25static int ez_input_mapping(struct hid_device *hdev, struct hid_input *hi,
     26		struct hid_field *field, struct hid_usage *usage,
     27		unsigned long **bit, int *max)
     28{
     29	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
     30		return 0;
     31
     32	switch (usage->hid & HID_USAGE) {
     33	case 0x230: ez_map_key(BTN_MOUSE);	break;
     34	case 0x231: ez_map_rel(REL_WHEEL);	break;
     35	/*
     36	 * this keyboard has a scrollwheel implemented in
     37	 * totally broken way. We map this usage temporarily
     38	 * to HWHEEL and handle it in the event quirk handler
     39	 */
     40	case 0x232: ez_map_rel(REL_HWHEEL);	break;
     41	default:
     42		return 0;
     43	}
     44	return 1;
     45}
     46
     47static int ez_event(struct hid_device *hdev, struct hid_field *field,
     48		struct hid_usage *usage, __s32 value)
     49{
     50	if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
     51			!usage->type)
     52		return 0;
     53
     54	/* handle the temporary quirky mapping to HWHEEL */
     55	if (usage->type == EV_REL && usage->code == REL_HWHEEL) {
     56		struct input_dev *input = field->hidinput->input;
     57		input_event(input, usage->type, REL_WHEEL, -value);
     58		return 1;
     59	}
     60
     61	return 0;
     62}
     63
     64static const struct hid_device_id ez_devices[] = {
     65	{ HID_USB_DEVICE(USB_VENDOR_ID_EZKEY, USB_DEVICE_ID_BTC_8193) },
     66	{ }
     67};
     68MODULE_DEVICE_TABLE(hid, ez_devices);
     69
     70static struct hid_driver ez_driver = {
     71	.name = "ezkey",
     72	.id_table = ez_devices,
     73	.input_mapping = ez_input_mapping,
     74	.event = ez_event,
     75};
     76module_hid_driver(ez_driver);
     77
     78MODULE_LICENSE("GPL");