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 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
  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 = 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;
 193 err_free:
 194         kfree(zc);
 195
 196         return ret;
 197 }
 198
 199 static 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
 209 static const struct hid_device_id zc_devices[] = {
 210         { HID_USB_DEVICE(USB_VENDOR_ID_ZYDACRON, USB_DEVICE_ID_ZYDACRON_REMOTE_CONTROL) },
 211         { }
 212 };
 213 MODULE_DEVICE_TABLE(hid, zc_devices);
 214
 215 static 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
 225 static int __init zc_init(void)
 226 {
 227         return hid_register_driver(&zc_driver);
 228 }
 229
 230 static void __exit zc_exit(void)
 231 {
 232         hid_unregister_driver(&zc_driver);
 233 }
 234
 235 module_init(zc_init);
 236 module_exit(zc_exit);
 237 MODULE_LICENSE("GPL");