1/*
2*  HID driver for zydacron remote control
3*
4*  Copyright (c) 2010 Don Prince <dhprince.devel@yahoo.co.uk>
5*/
6
7/*
8* This program is free software; you can redistribute it and/or modify it
9* under the terms of the GNU General Public License as published by the Free
10* Software Foundation; either version 2 of the License, or (at your option)
11* any later version.
12*/
13
14#include <linux/device.h>
15#include <linux/hid.h>
16#include <linux/module.h>
17
18#include "hid-ids.h"
19
20struct zc_device {
21	struct input_dev	*input_ep81;
22	unsigned short		last_key[4];
23};
24
25
26/*
27* Zydacron remote control has an invalid HID report descriptor,
28* that needs fixing before we can parse it.
29*/
30static __u8 *zc_report_fixup(struct hid_device *hdev, __u8 *rdesc,
31	unsigned int *rsize)
32{
33	if (*rsize >= 253 &&
34		rdesc[0x96] == 0xbc && rdesc[0x97] == 0xff &&
35		rdesc[0xca] == 0xbc && rdesc[0xcb] == 0xff &&
36		rdesc[0xe1] == 0xbc && rdesc[0xe2] == 0xff) {
37			hid_info(hdev,
38				"fixing up zydacron remote control report descriptor\n");
39			rdesc[0x96] = rdesc[0xca] = rdesc[0xe1] = 0x0c;
40			rdesc[0x97] = rdesc[0xcb] = rdesc[0xe2] = 0x00;
41		}
42	return rdesc;
43}
44
45#define zc_map_key_clear(c) \
46	hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
47
48static int zc_input_mapping(struct hid_device *hdev, struct hid_input *hi,
49	struct hid_field *field, struct hid_usage *usage,
50	unsigned long **bit, int *max)
51{
52	int i;
53	struct zc_device *zc = hid_get_drvdata(hdev);
54	zc->input_ep81 = hi->input;
55
56	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
57		return 0;
58
59	dbg_hid("zynacron input mapping event [0x%x]\n",
60		usage->hid & HID_USAGE);
61
62	switch (usage->hid & HID_USAGE) {
63	/* report 2 */
64	case 0x10:
65		zc_map_key_clear(KEY_MODE);
66		break;
67	case 0x30:
68		zc_map_key_clear(KEY_SCREEN);
69		break;
70	case 0x70:
71		zc_map_key_clear(KEY_INFO);
72		break;
73	/* report 3 */
74	case 0x04:
75		zc_map_key_clear(KEY_RADIO);
76		break;
77	/* report 4 */
78	case 0x0d:
79		zc_map_key_clear(KEY_PVR);
80		break;
81	case 0x25:
82		zc_map_key_clear(KEY_TV);
83		break;
84	case 0x47:
85		zc_map_key_clear(KEY_AUDIO);
86		break;
87	case 0x49:
88		zc_map_key_clear(KEY_AUX);
89		break;
90	case 0x4a:
91		zc_map_key_clear(KEY_VIDEO);
92		break;
93	case 0x48:
94		zc_map_key_clear(KEY_DVD);
95		break;
96	case 0x24:
97		zc_map_key_clear(KEY_MENU);
98		break;
99	case 0x32:
100		zc_map_key_clear(KEY_TEXT);
101		break;
102	default:
103		return 0;
104	}
105
106	for (i = 0; i < 4; i++)
107		zc->last_key[i] = 0;
108
109	return 1;
110}
111
112static int zc_raw_event(struct hid_device *hdev, struct hid_report *report,
113	 u8 *data, int size)
114{
115	struct zc_device *zc = hid_get_drvdata(hdev);
116	int ret = 0;
117	unsigned key;
118	unsigned short index;
119
120	if (report->id == data[0]) {
121
122		/* break keys */
123		for (index = 0; index < 4; index++) {
124			key = zc->last_key[index];
125			if (key) {
126				input_event(zc->input_ep81, EV_KEY, key, 0);
127				zc->last_key[index] = 0;
128			}
129		}
130
131		key = 0;
132		switch (report->id) {
133		case 0x02:
134		case 0x03:
135			switch (data[1]) {
136			case 0x10:
137				key = KEY_MODE;
138				index = 0;
139				break;
140			case 0x30:
141				key = KEY_SCREEN;
142				index = 1;
143				break;
144			case 0x70:
145				key = KEY_INFO;
146				index = 2;
147				break;
148			case 0x04:
149				key = KEY_RADIO;
150				index = 3;
151				break;
152			}
153
154			if (key) {
155				input_event(zc->input_ep81, EV_KEY, key, 1);
156				zc->last_key[index] = key;
157			}
158
159			ret = 1;
160			break;
161		}
162	}
163
164	return ret;
165}
166
167static int zc_probe(struct hid_device *hdev, const struct hid_device_id *id)
168{
169	int ret;
170	struct zc_device *zc;
171
172	zc = devm_kzalloc(&hdev->dev, sizeof(*zc), GFP_KERNEL);
173	if (zc == NULL) {
174		hid_err(hdev, "can't alloc descriptor\n");
175		return -ENOMEM;
176	}
177
178	hid_set_drvdata(hdev, zc);
179
180	ret = hid_parse(hdev);
181	if (ret) {
182		hid_err(hdev, "parse failed\n");
183		return ret;
184	}
185
186	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
187	if (ret) {
188		hid_err(hdev, "hw start failed\n");
189		return ret;
190	}
191
192	return 0;
193}
194
195static const struct hid_device_id zc_devices[] = {
196	{ HID_USB_DEVICE(USB_VENDOR_ID_ZYDACRON, USB_DEVICE_ID_ZYDACRON_REMOTE_CONTROL) },
197	{ }
198};
199MODULE_DEVICE_TABLE(hid, zc_devices);
200
201static struct hid_driver zc_driver = {
202	.name = "zydacron",
203	.id_table = zc_devices,
204	.report_fixup = zc_report_fixup,
205	.input_mapping = zc_input_mapping,
206	.raw_event = zc_raw_event,
207	.probe = zc_probe,
208};
209module_hid_driver(zc_driver);
210
211MODULE_LICENSE("GPL");
212