LXR linux/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 */
  29static 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))
  42static 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
  60static const struct hid_device_id ch_devices[] = {
  61        { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
  62        { }
  63};
  64MODULE_DEVICE_TABLE(hid, ch_devices);
  65
  66static 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
  73static int ch_init(void)
  74{
  75        return hid_register_driver(&ch_driver);
  76}
  77
  78static void ch_exit(void)
  79{
  80        hid_unregister_driver(&ch_driver);
  81}
  82
  83module_init(ch_init);
  84module_exit(ch_exit);
  85MODULE_LICENSE("GPL");
  86