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Linux/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 
 20 struct 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 */
 30 static __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 
 48 static 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 
112 static 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 
167 static 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 
195 static const struct hid_device_id zc_devices[] = {
196         { HID_USB_DEVICE(USB_VENDOR_ID_ZYDACRON, USB_DEVICE_ID_ZYDACRON_REMOTE_CONTROL) },
197         { }
198 };
199 MODULE_DEVICE_TABLE(hid, zc_devices);
200 
201 static 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 };
209 module_hid_driver(zc_driver);
210 
211 MODULE_LICENSE("GPL");
212 

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