1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  HID driver for EVision devices
4 *  For now, only ignore bogus consumer reports
5 *  sent after the keyboard has been configured
6 *
7 *  Copyright (c) 2022 Philippe Valembois
8 */
9
10#include <linux/device.h>
11#include <linux/input.h>
12#include <linux/hid.h>
13#include <linux/module.h>
14
15#include "hid-ids.h"
16
17static int evision_input_mapping(struct hid_device *hdev, struct hid_input *hi,
18		struct hid_field *field, struct hid_usage *usage,
19		unsigned long **bit, int *max)
20{
21	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
22		return 0;
23
24	/* Ignore key down event */
25	if ((usage->hid & HID_USAGE) >> 8 == 0x05)
26		return -1;
27	/* Ignore key up event */
28	if ((usage->hid & HID_USAGE) >> 8 == 0x06)
29		return -1;
30
31	switch (usage->hid & HID_USAGE) {
32	/* Ignore configuration saved event */
33	case 0x0401: return -1;
34	/* Ignore reset event */
35	case 0x0402: return -1;
36	}
37	return 0;
38}
39
40static const struct hid_device_id evision_devices[] = {
41	{ HID_USB_DEVICE(USB_VENDOR_ID_EVISION, USB_DEVICE_ID_EVISION_ICL01) },
42	{ }
43};
44MODULE_DEVICE_TABLE(hid, evision_devices);
45
46static struct hid_driver evision_driver = {
47	.name = "evision",
48	.id_table = evision_devices,
49	.input_mapping = evision_input_mapping,
50};
51module_hid_driver(evision_driver);
52
53MODULE_LICENSE("GPL");
54