1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3*  HID driver for zydacron remote control
4*
5*  Copyright (c) 2010 Don Prince <dhprince.devel@yahoo.co.uk>
6*/
7
8/*
9*/
10
11#include <linux/device.h>
12#include <linux/hid.h>
13#include <linux/module.h>
14
15#include "hid-ids.h"
16
17struct zc_device {
18	struct input_dev	*input_ep81;
19	unsigned short		last_key[4];
20};
21
22
23/*
24* Zydacron remote control has an invalid HID report descriptor,
25* that needs fixing before we can parse it.
26*/
27static __u8 *zc_report_fixup(struct hid_device *hdev, __u8 *rdesc,
28	unsigned int *rsize)
29{
30	if (*rsize >= 253 &&
31		rdesc[0x96] == 0xbc && rdesc[0x97] == 0xff &&
32		rdesc[0xca] == 0xbc && rdesc[0xcb] == 0xff &&
33		rdesc[0xe1] == 0xbc && rdesc[0xe2] == 0xff) {
34			hid_info(hdev,
35				"fixing up zydacron remote control report descriptor\n");
36			rdesc[0x96] = rdesc[0xca] = rdesc[0xe1] = 0x0c;
37			rdesc[0x97] = rdesc[0xcb] = rdesc[0xe2] = 0x00;
38		}
39	return rdesc;
40}
41
42#define zc_map_key_clear(c) \
43	hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
44
45static int zc_input_mapping(struct hid_device *hdev, struct hid_input *hi,
46	struct hid_field *field, struct hid_usage *usage,
47	unsigned long **bit, int *max)
48{
49	int i;
50	struct zc_device *zc = hid_get_drvdata(hdev);
51	zc->input_ep81 = hi->input;
52
53	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
54		return 0;
55
56	dbg_hid("zynacron input mapping event [0x%x]\n",
57		usage->hid & HID_USAGE);
58
59	switch (usage->hid & HID_USAGE) {
60	/* report 2 */
61	case 0x10:
62		zc_map_key_clear(KEY_MODE);
63		break;
64	case 0x30:
65		zc_map_key_clear(KEY_SCREEN);
66		break;
67	case 0x70:
68		zc_map_key_clear(KEY_INFO);
69		break;
70	/* report 3 */
71	case 0x04:
72		zc_map_key_clear(KEY_RADIO);
73		break;
74	/* report 4 */
75	case 0x0d:
76		zc_map_key_clear(KEY_PVR);
77		break;
78	case 0x25:
79		zc_map_key_clear(KEY_TV);
80		break;
81	case 0x47:
82		zc_map_key_clear(KEY_AUDIO);
83		break;
84	case 0x49:
85		zc_map_key_clear(KEY_AUX);
86		break;
87	case 0x4a:
88		zc_map_key_clear(KEY_VIDEO);
89		break;
90	case 0x48:
91		zc_map_key_clear(KEY_DVD);
92		break;
93	case 0x24:
94		zc_map_key_clear(KEY_MENU);
95		break;
96	case 0x32:
97		zc_map_key_clear(KEY_TEXT);
98		break;
99	default:
100		return 0;
101	}
102
103	for (i = 0; i < 4; i++)
104		zc->last_key[i] = 0;
105
106	return 1;
107}
108
109static int zc_raw_event(struct hid_device *hdev, struct hid_report *report,
110	 u8 *data, int size)
111{
112	struct zc_device *zc = hid_get_drvdata(hdev);
113	int ret = 0;
114	unsigned key;
115	unsigned short index;
116
117	if (report->id == data[0]) {
118
119		/* break keys */
120		for (index = 0; index < 4; index++) {
121			key = zc->last_key[index];
122			if (key) {
123				input_event(zc->input_ep81, EV_KEY, key, 0);
124				zc->last_key[index] = 0;
125			}
126		}
127
128		key = 0;
129		switch (report->id) {
130		case 0x02:
131		case 0x03:
132			switch (data[1]) {
133			case 0x10:
134				key = KEY_MODE;
135				index = 0;
136				break;
137			case 0x30:
138				key = KEY_SCREEN;
139				index = 1;
140				break;
141			case 0x70:
142				key = KEY_INFO;
143				index = 2;
144				break;
145			case 0x04:
146				key = KEY_RADIO;
147				index = 3;
148				break;
149			}
150
151			if (key) {
152				input_event(zc->input_ep81, EV_KEY, key, 1);
153				zc->last_key[index] = key;
154			}
155
156			ret = 1;
157			break;
158		}
159	}
160
161	return ret;
162}
163
164static int zc_probe(struct hid_device *hdev, const struct hid_device_id *id)
165{
166	int ret;
167	struct zc_device *zc;
168
169	zc = devm_kzalloc(&hdev->dev, sizeof(*zc), GFP_KERNEL);
170	if (zc == NULL) {
171		hid_err(hdev, "can't alloc descriptor\n");
172		return -ENOMEM;
173	}
174
175	hid_set_drvdata(hdev, zc);
176
177	ret = hid_parse(hdev);
178	if (ret) {
179		hid_err(hdev, "parse failed\n");
180		return ret;
181	}
182
183	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
184	if (ret) {
185		hid_err(hdev, "hw start failed\n");
186		return ret;
187	}
188
189	return 0;
190}
191
192static const struct hid_device_id zc_devices[] = {
193	{ HID_USB_DEVICE(USB_VENDOR_ID_ZYDACRON, USB_DEVICE_ID_ZYDACRON_REMOTE_CONTROL) },
194	{ }
195};
196MODULE_DEVICE_TABLE(hid, zc_devices);
197
198static struct hid_driver zc_driver = {
199	.name = "zydacron",
200	.id_table = zc_devices,
201	.report_fixup = zc_report_fixup,
202	.input_mapping = zc_input_mapping,
203	.raw_event = zc_raw_event,
204	.probe = zc_probe,
205};
206module_hid_driver(zc_driver);
207
208MODULE_LICENSE("GPL");
209