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) 2008 Jiri Slaby
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 2 of the License, or (at your option)
  15  * any later version.
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/hid.h>
  20 #include <linux/module.h>
  21
  22 #include "hid-ids.h"
  23
  24 /*
  25  * Cherry Cymotion keyboard have an invalid HID report descriptor,
  26  * that needs fixing before we can parse it.
  27  */
  28 static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  29                 unsigned int *rsize)
  30 {
  31         if (*rsize >= 17 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
  32                 hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");
  33                 rdesc[11] = rdesc[16] = 0xff;
  34                 rdesc[12] = rdesc[17] = 0x03;
  35         }
  36         return rdesc;
  37 }
  38
  39 #define ch_map_key_clear(c)     hid_map_usage_clear(hi, usage, bit, max, \
  40                                         EV_KEY, (c))
  41 static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  42                 struct hid_field *field, struct hid_usage *usage,
  43                 unsigned long **bit, int *max)
  44 {
  45         if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
  46                 return 0;
  47
  48         switch (usage->hid & HID_USAGE) {
  49         case 0x301: ch_map_key_clear(KEY_PROG1);        break;
  50         case 0x302: ch_map_key_clear(KEY_PROG2);        break;
  51         case 0x303: ch_map_key_clear(KEY_PROG3);        break;
  52         default:
  53                 return 0;
  54         }
  55
  56         return 1;
  57 }
  58
  59 static const struct hid_device_id ch_devices[] = {
  60         { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
  61         { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) },
  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 __init ch_init(void)
  74 {
  75         return hid_register_driver(&ch_driver);
  76 }
  77
  78 static void __exit 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");