1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  HID driver for some chicony "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) 2007 Paul Walmsley
10 *  Copyright (c) 2008 Jiri Slaby
11 */
12
13/*
14 */
15
16#include <linux/device.h>
17#include <linux/input.h>
18#include <linux/hid.h>
19#include <linux/module.h>
20#include <linux/usb.h>
21
22#include "hid-ids.h"
23
24#define ch_map_key_clear(c)	hid_map_usage_clear(hi, usage, bit, max, \
25					EV_KEY, (c))
26static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
27		struct hid_field *field, struct hid_usage *usage,
28		unsigned long **bit, int *max)
29{
30	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_MSVENDOR)
31		return 0;
32
33	set_bit(EV_REP, hi->input->evbit);
34	switch (usage->hid & HID_USAGE) {
35	case 0xff01: ch_map_key_clear(BTN_1);	break;
36	case 0xff02: ch_map_key_clear(BTN_2);	break;
37	case 0xff03: ch_map_key_clear(BTN_3);	break;
38	case 0xff04: ch_map_key_clear(BTN_4);	break;
39	case 0xff05: ch_map_key_clear(BTN_5);	break;
40	case 0xff06: ch_map_key_clear(BTN_6);	break;
41	case 0xff07: ch_map_key_clear(BTN_7);	break;
42	case 0xff08: ch_map_key_clear(BTN_8);	break;
43	case 0xff09: ch_map_key_clear(BTN_9);	break;
44	case 0xff0a: ch_map_key_clear(BTN_A);	break;
45	case 0xff0b: ch_map_key_clear(BTN_B);	break;
46	case 0x00f1: ch_map_key_clear(KEY_WLAN);	break;
47	case 0x00f2: ch_map_key_clear(KEY_BRIGHTNESSDOWN);	break;
48	case 0x00f3: ch_map_key_clear(KEY_BRIGHTNESSUP);	break;
49	case 0x00f4: ch_map_key_clear(KEY_DISPLAY_OFF);	break;
50	case 0x00f7: ch_map_key_clear(KEY_CAMERA);	break;
51	case 0x00f8: ch_map_key_clear(KEY_PROG1);	break;
52	default:
53		return 0;
54	}
55	return 1;
56}
57
58static __u8 *ch_switch12_report_fixup(struct hid_device *hdev, __u8 *rdesc,
59		unsigned int *rsize)
60{
61	struct usb_interface *intf;
62
63	if (!hid_is_usb(hdev))
64		return rdesc;
65
66	intf = to_usb_interface(hdev->dev.parent);
67	if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
68		/* Change usage maximum and logical maximum from 0x7fff to
69		 * 0x2fff, so they don't exceed HID_MAX_USAGES */
70		switch (hdev->product) {
71		case USB_DEVICE_ID_CHICONY_ACER_SWITCH12:
72			if (*rsize >= 128 && rdesc[64] == 0xff && rdesc[65] == 0x7f
73					&& rdesc[69] == 0xff && rdesc[70] == 0x7f) {
74				hid_info(hdev, "Fixing up report descriptor\n");
75				rdesc[65] = rdesc[70] = 0x2f;
76			}
77			break;
78		}
79
80	}
81	return rdesc;
82}
83
84
85static const struct hid_device_id ch_devices[] = {
86	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_TACTICAL_PAD) },
87	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_WIRELESS2) },
88	{ HID_USB_DEVICE(USB_VENDOR_ID_CHICONY, USB_DEVICE_ID_CHICONY_ACER_SWITCH12) },
89	{ }
90};
91MODULE_DEVICE_TABLE(hid, ch_devices);
92
93static struct hid_driver ch_driver = {
94	.name = "chicony",
95	.id_table = ch_devices,
96	.report_fixup = ch_switch12_report_fixup,
97	.input_mapping = ch_input_mapping,
98};
99module_hid_driver(ch_driver);
100
101MODULE_LICENSE("GPL");
102