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-a4tech.c (4233B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 *  HID driver for some a4tech "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#include <linux/slab.h>
     20
     21#include "hid-ids.h"
     22
     23#define A4_2WHEEL_MOUSE_HACK_7	0x01
     24#define A4_2WHEEL_MOUSE_HACK_B8	0x02
     25
     26#define A4_WHEEL_ORIENTATION	(HID_UP_GENDESK | 0x000000b8)
     27
     28struct a4tech_sc {
     29	unsigned long quirks;
     30	unsigned int hw_wheel;
     31	__s32 delayed_value;
     32};
     33
     34static int a4_input_mapping(struct hid_device *hdev, struct hid_input *hi,
     35			    struct hid_field *field, struct hid_usage *usage,
     36			    unsigned long **bit, int *max)
     37{
     38	struct a4tech_sc *a4 = hid_get_drvdata(hdev);
     39
     40	if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8 &&
     41	    usage->hid == A4_WHEEL_ORIENTATION) {
     42		/*
     43		 * We do not want to have this usage mapped to anything as it's
     44		 * nonstandard and doesn't really behave like an HID report.
     45		 * It's only selecting the orientation (vertical/horizontal) of
     46		 * the previous mouse wheel report. The input_events will be
     47		 * generated once both reports are recorded in a4_event().
     48		 */
     49		return -1;
     50	}
     51
     52	return 0;
     53
     54}
     55
     56static int a4_input_mapped(struct hid_device *hdev, struct hid_input *hi,
     57		struct hid_field *field, struct hid_usage *usage,
     58		unsigned long **bit, int *max)
     59{
     60	struct a4tech_sc *a4 = hid_get_drvdata(hdev);
     61
     62	if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
     63		set_bit(REL_HWHEEL, *bit);
     64		set_bit(REL_HWHEEL_HI_RES, *bit);
     65	}
     66
     67	if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007)
     68		return -1;
     69
     70	return 0;
     71}
     72
     73static int a4_event(struct hid_device *hdev, struct hid_field *field,
     74		struct hid_usage *usage, __s32 value)
     75{
     76	struct a4tech_sc *a4 = hid_get_drvdata(hdev);
     77	struct input_dev *input;
     78
     79	if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput)
     80		return 0;
     81
     82	input = field->hidinput->input;
     83
     84	if (a4->quirks & A4_2WHEEL_MOUSE_HACK_B8) {
     85		if (usage->type == EV_REL && usage->code == REL_WHEEL_HI_RES) {
     86			a4->delayed_value = value;
     87			return 1;
     88		}
     89
     90		if (usage->hid == A4_WHEEL_ORIENTATION) {
     91			input_event(input, EV_REL, value ? REL_HWHEEL :
     92					REL_WHEEL, a4->delayed_value);
     93			input_event(input, EV_REL, value ? REL_HWHEEL_HI_RES :
     94					REL_WHEEL_HI_RES, a4->delayed_value * 120);
     95			return 1;
     96		}
     97	}
     98
     99	if ((a4->quirks & A4_2WHEEL_MOUSE_HACK_7) && usage->hid == 0x00090007) {
    100		a4->hw_wheel = !!value;
    101		return 1;
    102	}
    103
    104	if (usage->code == REL_WHEEL_HI_RES && a4->hw_wheel) {
    105		input_event(input, usage->type, REL_HWHEEL, value);
    106		input_event(input, usage->type, REL_HWHEEL_HI_RES, value * 120);
    107		return 1;
    108	}
    109
    110	return 0;
    111}
    112
    113static int a4_probe(struct hid_device *hdev, const struct hid_device_id *id)
    114{
    115	struct a4tech_sc *a4;
    116	int ret;
    117
    118	a4 = devm_kzalloc(&hdev->dev, sizeof(*a4), GFP_KERNEL);
    119	if (a4 == NULL) {
    120		hid_err(hdev, "can't alloc device descriptor\n");
    121		return -ENOMEM;
    122	}
    123
    124	a4->quirks = id->driver_data;
    125
    126	hid_set_drvdata(hdev, a4);
    127
    128	ret = hid_parse(hdev);
    129	if (ret) {
    130		hid_err(hdev, "parse failed\n");
    131		return ret;
    132	}
    133
    134	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
    135	if (ret) {
    136		hid_err(hdev, "hw start failed\n");
    137		return ret;
    138	}
    139
    140	return 0;
    141}
    142
    143static const struct hid_device_id a4_devices[] = {
    144	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_WCP32PU),
    145		.driver_data = A4_2WHEEL_MOUSE_HACK_7 },
    146	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_X5_005D),
    147		.driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
    148	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_RP_649),
    149		.driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
    150	{ HID_USB_DEVICE(USB_VENDOR_ID_A4TECH, USB_DEVICE_ID_A4TECH_NB_95),
    151		.driver_data = A4_2WHEEL_MOUSE_HACK_B8 },
    152	{ }
    153};
    154MODULE_DEVICE_TABLE(hid, a4_devices);
    155
    156static struct hid_driver a4_driver = {
    157	.name = "a4tech",
    158	.id_table = a4_devices,
    159	.input_mapping = a4_input_mapping,
    160	.input_mapped = a4_input_mapped,
    161	.event = a4_event,
    162	.probe = a4_probe,
    163};
    164module_hid_driver(a4_driver);
    165
    166MODULE_LICENSE("GPL");