drivers/hid/hid-cherry.c

   1 /*
   2  *  HID driver for some cherry "special" devices
   3  *
   4  *  Copyright (c) 1999 Andreas Gal
   5  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   6  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   7  *  Copyright (c) 2006-2007 Jiri Kosina
   8  *  Copyright (c) 2007 Paul Walmsley
   9  *  Copyright (c) 2008 Jiri Slaby
  10  */
  11
  12 /*
  13  * This program is free software; you can redistribute it and/or modify it
  14  * under the terms of the GNU General Public License as published by the Free
  15  * Software Foundation; either version 2 of the License, or (at your option)
  16  * any later version.
  17  */
  18
  19 #include <linux/device.h>
  20 #include <linux/hid.h>
  21 #include <linux/module.h>
  22
  23 #include "hid-ids.h"
  24
  25 /*
  26  * Cherry Cymotion keyboard have an invalid HID report descriptor,
  27  * that needs fixing before we can parse it.
  28  */
  29 static void ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  30                 unsigned int rsize)
  31 {
  32         if (rsize >= 17 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
  33                 dev_info(&hdev->dev, "fixing up Cherry Cymotion report "
  34                                 "descriptor\n");
  35                 rdesc[11] = rdesc[16] = 0xff;
  36                 rdesc[12] = rdesc[17] = 0x03;
  37         }
  38 }
  39
  40 #define ch_map_key_clear(c)     hid_map_usage_clear(hi, usage, bit, max, \
  41                                         EV_KEY, (c))
  42 static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  43                 struct hid_field *field, struct hid_usage *usage,
  44                 unsigned long **bit, int *max)
  45 {
  46         if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
  47                 return 0;
  48
  49         switch (usage->hid & HID_USAGE) {
  50         case 0x301: ch_map_key_clear(KEY_PROG1);        break;
  51         case 0x302: ch_map_key_clear(KEY_PROG2);        break;
  52         case 0x303: ch_map_key_clear(KEY_PROG3);        break;
  53         default:
  54                 return 0;
  55         }
  56
  57         return 1;
  58 }
  59
  60 static const struct hid_device_id ch_devices[] = {
  61         { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
  62         { }
  63 };
  64 MODULE_DEVICE_TABLE(hid, ch_devices);
  65
  66 static struct hid_driver ch_driver = {
  67         .name = "cherry",
  68         .id_table = ch_devices,
  69         .report_fixup = ch_report_fixup,
  70         .input_mapping = ch_input_mapping,
  71 };
  72
  73 static int ch_init(void)
  74 {
  75         return hid_register_driver(&ch_driver);
  76 }
  77
  78 static void ch_exit(void)
  79 {
  80         hid_unregister_driver(&ch_driver);
  81 }
  82
  83 module_init(ch_init);
  84 module_exit(ch_exit);
  85 MODULE_LICENSE("GPL");
  86
  87 HID_COMPAT_LOAD_DRIVER(cherry);