hid-cherry.c

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/*
 *  HID driver for some cherry "special" devices
 *
 *  Copyright (c) 1999 Andreas Gal
 *  Copyright (c) 2000-2005 Vojtech Pavlik <[email protected]>
 *  Copyright (c) 2005 Michael Haboustak <[email protected]> for Concept2, Inc
 *  Copyright (c) 2006-2007 Jiri Kosina
 *  Copyright (c) 2008 Jiri Slaby
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>

#include "hid-ids.h"

/*
 * Cherry Cymotion keyboard have an invalid HID report descriptor,
 * that needs fixing before we can parse it.
 */
static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
        unsigned int *rsize)
{
    if (*rsize >= 17 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
        hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");
        rdesc[11] = rdesc[16] = 0xff;
        rdesc[12] = rdesc[17] = 0x03;
    }
    return rdesc;
}

#define ch_map_key_clear(c) hid_map_usage_clear(hi, usage, bit, max, \
                    EV_KEY, (c))
static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
        struct hid_field *field, struct hid_usage *usage,
        unsigned long **bit, int *max)
{
    if ((usage->hid & HID_USAGE_PAGE) != HID_UP_CONSUMER)
        return 0;

    switch (usage->hid & HID_USAGE) {
    case 0x301: ch_map_key_clear(KEY_PROG1);    break;
    case 0x302: ch_map_key_clear(KEY_PROG2);    break;
    case 0x303: ch_map_key_clear(KEY_PROG3);    break;
    default:
        return 0;
    }

    return 1;
}

static const struct hid_device_id ch_devices[] = {
    { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION) },
    { HID_USB_DEVICE(USB_VENDOR_ID_CHERRY, USB_DEVICE_ID_CHERRY_CYMOTION_SOLAR) },
    { }
};
MODULE_DEVICE_TABLE(hid, ch_devices);

static struct hid_driver ch_driver = {
    .name = "cherry",
    .id_table = ch_devices,
    .report_fixup = ch_report_fixup,
    .input_mapping = ch_input_mapping,
};

static int __init ch_init(void)
{
    return hid_register_driver(&ch_driver);
}

static void __exit ch_exit(void)
{
    hid_unregister_driver(&ch_driver);
}

module_init(ch_init);
module_exit(ch_exit);
MODULE_LICENSE("GPL");