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                         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         return rdesc;
  44 }
  45
  46 #define zc_map_key_clear(c) \
  47         hid_map_usage_clear(hi, usage, bit, max, EV_KEY, (c))
  48
  49 static int zc_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  50         struct hid_field *field, struct hid_usage *usage,
  51         unsigned long **bit, int *max)
  52 {
  53         int i;
  54         struct zc_device *zc = hid_get_drvdata(hdev);
  55         zc->input_ep81 = hi->input;
  56
  57         if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
  58                 return 0;
  59
  60         dbg_hid("zynacron input mapping event [0x%x]\n",
  61                 usage->hid & HID_USAGE);
  62
  63         switch (usage->hid & HID_USAGE) {
  64         /* report 2 */
  65         case 0x10:
  66                 zc_map_key_clear(KEY_MODE);
  67                 break;
  68         case 0x30:
  69                 zc_map_key_clear(KEY_SCREEN);
  70                 break;
  71         case 0x70:
  72                 zc_map_key_clear(KEY_INFO);
  73                 break;
  74         /* report 3 */
  75         case 0x04:
  76                 zc_map_key_clear(KEY_RADIO);
  77                 break;
  78         /* report 4 */
  79         case 0x0d:
  80                 zc_map_key_clear(KEY_PVR);
  81                 break;
  82         case 0x25:
  83                 zc_map_key_clear(KEY_TV);
  84                 break;
  85         case 0x47:
  86                 zc_map_key_clear(KEY_AUDIO);
  87                 break;
  88         case 0x49:
  89                 zc_map_key_clear(KEY_AUX);
  90                 break;
  91         case 0x4a:
  92                 zc_map_key_clear(KEY_VIDEO);
  93                 break;
  94         case 0x48:
  95                 zc_map_key_clear(KEY_DVD);
  96                 break;
  97         case 0x24:
  98                 zc_map_key_clear(KEY_MENU);
  99                 break;
 100         case 0x32:
 101                 zc_map_key_clear(KEY_TEXT);
 102                 break;
 103         default:
 104                 return 0;
 105         }
 106
 107         for (i = 0; i < 4; i++)
 108                 zc->last_key[i] = 0;
 109
 110         return 1;
 111 }
 112
 113 static int zc_raw_event(struct hid_device *hdev, struct hid_report *report,
 114          u8 *data, int size)
 115 {
 116         struct zc_device *zc = hid_get_drvdata(hdev);
 117         int ret = 0;
 118         unsigned key;
 119         unsigned short index;
 120
 121         if (report->id == data[0]) {
 122
 123                 /* break keys */
 124                 for (index = 0; index < 4; index++) {
 125                         key = zc->last_key[index];
 126                         if (key) {
 127                                 input_event(zc->input_ep81, EV_KEY, key, 0);
 128                                 zc->last_key[index] = 0;
 129                         }
 130                 }
 131
 132                 key = 0;
 133                 switch (report->id) {
 134                 case 0x02:
 135                 case 0x03:
 136                         switch (data[1]) {
 137                         case 0x10:
 138                                 key = KEY_MODE;
 139                                 index = 0;
 140                                 break;
 141                         case 0x30:
 142                                 key = KEY_SCREEN;
 143                                 index = 1;
 144                                 break;
 145                         case 0x70:
 146                                 key = KEY_INFO;
 147                                 index = 2;
 148                                 break;
 149                         case 0x04:
 150                                 key = KEY_RADIO;
 151                                 index = 3;
 152                                 break;
 153                         }
 154
 155                         if (key) {
 156                                 input_event(zc->input_ep81, EV_KEY, key, 1);
 157                                 zc->last_key[index] = key;
 158                         }
 159
 160                         ret = 1;
 161                         break;
 162                 }
 163         }
 164
 165         return ret;
 166 }
 167
 168 static int zc_probe(struct hid_device *hdev, const struct hid_device_id *id)
 169 {
 170         int ret;
 171         struct zc_device *zc;
 172
 173         zc = kzalloc(sizeof(*zc), GFP_KERNEL);
 174         if (zc == NULL) {
 175                 dev_err(&hdev->dev, "zydacron: can't alloc descriptor\n");
 176                 return -ENOMEM;
 177         }
 178
 179         hid_set_drvdata(hdev, zc);
 180
 181         ret = hid_parse(hdev);
 182         if (ret) {
 183                 dev_err(&hdev->dev, "zydacron: parse failed\n");
 184                 goto err_free;
 185         }
 186
 187         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 188         if (ret) {
 189                 dev_err(&hdev->dev, "zydacron: hw start failed\n");
 190                 goto err_free;
 191         }
 192
 193         return 0;
 194 err_free:
 195         kfree(zc);
 196
 197         return ret;
 198 }
 199
 200 static void zc_remove(struct hid_device *hdev)
 201 {
 202         struct zc_device *zc = hid_get_drvdata(hdev);
 203
 204         hid_hw_stop(hdev);
 205
 206         if (NULL != zc)
 207                 kfree(zc);
 208 }
 209
 210 static const struct hid_device_id zc_devices[] = {
 211         { HID_USB_DEVICE(USB_VENDOR_ID_ZYDACRON, USB_DEVICE_ID_ZYDACRON_REMOTE_CONTROL) },
 212         { }
 213 };
 214 MODULE_DEVICE_TABLE(hid, zc_devices);
 215
 216 static struct hid_driver zc_driver = {
 217         .name = "zydacron",
 218         .id_table = zc_devices,
 219         .report_fixup = zc_report_fixup,
 220         .input_mapping = zc_input_mapping,
 221         .raw_event = zc_raw_event,
 222         .probe = zc_probe,
 223         .remove = zc_remove,
 224 };
 225
 226 static int __init zc_init(void)
 227 {
 228         return hid_register_driver(&zc_driver);
 229 }
 230
 231 static void __exit zc_exit(void)
 232 {
 233         hid_unregister_driver(&zc_driver);
 234 }
 235
 236 module_init(zc_init);
 237 module_exit(zc_exit);
 238 MODULE_LICENSE("GPL");