hid-cypress.c

Go to the documentation of this file.

/*
 *  HID driver for some cypress "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/input.h>
#include <linux/module.h>

#include "hid-ids.h"

#define CP_RDESC_SWAPPED_MIN_MAX    0x01
#define CP_2WHEEL_MOUSE_HACK        0x02
#define CP_2WHEEL_MOUSE_HACK_ON     0x04

/*
 * Some USB barcode readers from cypress have usage min and usage max in
 * the wrong order
 */
static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
        unsigned int *rsize)
{
    unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
    unsigned int i;

    if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX))
        return rdesc;

    for (i = 0; i < *rsize - 4; i++)
        if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
            __u8 tmp;

            rdesc[i] = 0x19;
            rdesc[i + 2] = 0x29;
            tmp = rdesc[i + 3];
            rdesc[i + 3] = rdesc[i + 1];
            rdesc[i + 1] = tmp;
        }
    return rdesc;
}

static int cp_input_mapped(struct hid_device *hdev, struct hid_input *hi,
        struct hid_field *field, struct hid_usage *usage,
        unsigned long **bit, int *max)
{
    unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);

    if (!(quirks & CP_2WHEEL_MOUSE_HACK))
        return 0;

    if (usage->type == EV_REL && usage->code == REL_WHEEL)
        set_bit(REL_HWHEEL, *bit);
    if (usage->hid == 0x00090005)
        return -1;

    return 0;
}

static int cp_event(struct hid_device *hdev, struct hid_field *field,
        struct hid_usage *usage, __s32 value)
{
    unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);

    if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput ||
            !usage->type || !(quirks & CP_2WHEEL_MOUSE_HACK))
        return 0;

    if (usage->hid == 0x00090005) {
        if (value)
            quirks |=  CP_2WHEEL_MOUSE_HACK_ON;
        else
            quirks &= ~CP_2WHEEL_MOUSE_HACK_ON;
        hid_set_drvdata(hdev, (void *)quirks);
        return 1;
    }

    if (usage->code == REL_WHEEL && (quirks & CP_2WHEEL_MOUSE_HACK_ON)) {
        struct input_dev *input = field->hidinput->input;

        input_event(input, usage->type, REL_HWHEEL, value);
        return 1;
    }

    return 0;
}

static int cp_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
    unsigned long quirks = id->driver_data;
    int ret;

    hid_set_drvdata(hdev, (void *)quirks);

    ret = hid_parse(hdev);
    if (ret) {
        hid_err(hdev, "parse failed\n");
        goto err_free;
    }

    ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
    if (ret) {
        hid_err(hdev, "hw start failed\n");
        goto err_free;
    }

    return 0;
err_free:
    return ret;
}

static const struct hid_device_id cp_devices[] = {
    { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_1),
        .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
    { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_2),
        .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
    { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_3),
        .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
    { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_BARCODE_4),
        .driver_data = CP_RDESC_SWAPPED_MIN_MAX },
    { HID_USB_DEVICE(USB_VENDOR_ID_CYPRESS, USB_DEVICE_ID_CYPRESS_MOUSE),
        .driver_data = CP_2WHEEL_MOUSE_HACK },
    { }
};
MODULE_DEVICE_TABLE(hid, cp_devices);

static struct hid_driver cp_driver = {
    .name = "cypress",
    .id_table = cp_devices,
    .report_fixup = cp_report_fixup,
    .input_mapped = cp_input_mapped,
    .event = cp_event,
    .probe = cp_probe,
};

static int __init cp_init(void)
{
    return hid_register_driver(&cp_driver);
}

static void __exit cp_exit(void)
{
    hid_unregister_driver(&cp_driver);
}

module_init(cp_init);
module_exit(cp_exit);
MODULE_LICENSE("GPL");