/drivers/hid/hid-zydacron.c

  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 void 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			dev_info(&hdev->dev,
 38				"fixing up zydacron remote control report "
 39				"descriptor\n");
 40			rdesc[0x96] = rdesc[0xca] = rdesc[0xe1] = 0x0c;
 41			rdesc[0x97] = rdesc[0xcb] = rdesc[0xe2] = 0x00;
 42		}
 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 = kzalloc(sizeof(*zc), GFP_KERNEL);
173	if (zc == NULL) {
174		dev_err(&hdev->dev, "zydacron: 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		dev_err(&hdev->dev, "zydacron: parse failed\n");
183		goto err_free;
184	}
185
186	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
187	if (ret) {
188		dev_err(&hdev->dev, "zydacron: hw start failed\n");
189		goto err_free;
190	}
191
192	return 0;
193err_free:
194	kfree(zc);
195
196	return ret;
197}
198
199static void zc_remove(struct hid_device *hdev)
200{
201	struct zc_device *zc = hid_get_drvdata(hdev);
202
203	hid_hw_stop(hdev);
204
205	if (NULL != zc)
206		kfree(zc);
207}
208
209static const struct hid_device_id zc_devices[] = {
210	{ HID_USB_DEVICE(USB_VENDOR_ID_ZYDACRON, USB_DEVICE_ID_ZYDACRON_REMOTE_CONTROL) },
211	{ }
212};
213MODULE_DEVICE_TABLE(hid, zc_devices);
214
215static struct hid_driver zc_driver = {
216	.name = "zydacron",
217	.id_table = zc_devices,
218	.report_fixup = zc_report_fixup,
219	.input_mapping = zc_input_mapping,
220	.raw_event = zc_raw_event,
221	.probe = zc_probe,
222	.remove = zc_remove,
223};
224
225static int __init zc_init(void)
226{
227	return hid_register_driver(&zc_driver);
228}
229
230static void __exit zc_exit(void)
231{
232	hid_unregister_driver(&zc_driver);
233}
234
235module_init(zc_init);
236module_exit(zc_exit);
237MODULE_LICENSE("GPL");