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man mknod

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static int
madt_probe(void)
{
        ACPI_PHYSICAL_ADDRESS rsdp_ptr;
        ACPI_TABLE_RSDP *rsdp;
        ACPI_TABLE_RSDT *rsdt;
        ACPI_TABLE_XSDT *xsdt;
        int i, count;

        if (resource_disabled("acpi", 0))
                return (ENXIO);

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Господа, зачем спорить, если вы не знакомы с предметом? Подобные высказывания вводят в заблуждения посетителей форума.

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******
int     resource_disabled(const char *name, int unit);

******
device_t        device_add_child(device_t dev, const char *name, int unit);
                                         const char *name, int unit);
******
device_t        devclass_get_device(devclass_t dc, int unit);
int     devclass_get_devices(devclass_t dc, device_t **listp, int *countp);
static __inline type varp ## _get_ ## var(device_t dev)                 \
static __inline void varp ## _set_ ## var(device_t dev, type t)         \

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METHOD int deactivate_resource {
        device_t        _dev;
        device_t        _child;
        int             _type;
        int             _rid;
        struct resource *_r;
};

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man 9 bus_alloc_resource 

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struct atausb_softc {
    device_t            dev;            /* base device */
    usbd_interface_handle iface;        /* interface */
******
static void
atausb_clear_stall(struct atausb_softc *sc, u_int8_t endpt,
                   usbd_pipe_handle pipe, int state, usbd_xfer_handle xfer)
{
    usbd_device_handle udev;

    if (atausbdebug)
        device_printf(sc->dev, "clear endpoint 0x%02x stall\n", endpt);
    usbd_interface2device_handle(sc->iface, &udev);
    sc->state = state;
    usbd_clear_endpoint_toggle(pipe);
    sc->usb_request.bmRequestType = UT_WRITE_ENDPOINT;
    sc->usb_request.bRequest = UR_CLEAR_FEATURE;
    USETW(sc->usb_request.wValue, UF_ENDPOINT_HALT);
    USETW(sc->usb_request.wIndex, endpt);
    USETW(sc->usb_request.wLength, 0);
    atausb_ctl_start(sc, udev, &sc->usb_request, NULL, 0, 0, xfer);
}

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/*
 * Copyright (c) 2008 Anish Mistry. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
  This software allows the selective suspending and enabling of usb ports on a hub.
  Provide it the uhub device eg. /dev/usb2 the port on the hub to which the device
  is attached and the action.
  Use usbdevs -v to find the hub and port number
  eg. ./usb_power /dev/usb4 4 suspend

  NOTE: Using the disable action is not recommended.  suspend should achieve
  the desired result.
*/

#include <dev/usb/usb.h>
#include <sys/ioctl.h>

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#define PORT_DISABLE 0
#define PORT_ENABLE 1
#define PORT_SUSPEND 2

int
main(int argc, char *argv[])
{
        usb_device_descriptor_t usbdd;
        struct usb_ctl_request req;
        int fd, ret, port_num, dev_address;
        int enable = 0;

        if(argc != 4)
        {
                printf("usage: %s uhub_device port_num [enable|suspend|disable]\n", argv[0]);
                return 1;
        }

        if((fd = open(argv[1], O_RDWR, 0)) == -1)
        {
                printf("Can't open device %s!\n", argv[1]);
                return 1;
        }

        port_num = atoi(argv[2]);
        dev_address = 1;        // why? magic?

        if(strncmp("enable", argv[3], 6) == 0)
        {
                enable = PORT_ENABLE;
        }
        else if(strncmp("disable", argv[3], 7) == 0)
        {
                enable = PORT_DISABLE;
        }
        else if(strncmp("suspend", argv[3], 7) == 0)
        {
                enable = PORT_SUSPEND;
        }

        switch(enable)
        {
                case PORT_ENABLE:
                        // power up
                        bzero(&req, sizeof(req));
                        req.ucr_addr = dev_address;
                        req.ucr_request.bmRequestType = UT_WRITE_CLASS_OTHER;
                        req.ucr_request.bRequest = UR_SET_FEATURE;      // clear a feature
                        USETW(req.ucr_request.wIndex, port_num); // usb port number
                        USETW(req.ucr_request.wLength, 0);
                        USETW(req.ucr_request.wValue, UHF_PORT_POWER);
                        if (ioctl(fd, USB_REQUEST, &req) != 0) {
                                printf("ioctl USB_REQUEST UR_CLEAR_FEATURE UHF_PORT_POWER failed\n");
                                close(fd);
                                exit(EXIT_FAILURE);
                        }

                        // resume
                        bzero(&req, sizeof(req));
                        req.ucr_addr = dev_address;
                        req.ucr_request.bmRequestType = UT_WRITE_CLASS_OTHER;
                        req.ucr_request.bRequest = UR_CLEAR_FEATURE;    // set a feature
                        USETW(req.ucr_request.wIndex, port_num); // usb port number
                        USETW(req.ucr_request.wLength, 0);
                        USETW(req.ucr_request.wValue, UHF_PORT_SUSPEND);
                        if (ioctl(fd, USB_REQUEST, &req) != 0) {
                                printf("ioctl USB_REQUEST UR_SET_FEATURE UHF_PORT_SUSPEND failed\n");
                                close(fd);
                                exit(EXIT_FAILURE);
                        }

                        // enable
                        bzero(&req, sizeof(req));
                        req.ucr_addr = dev_address;
                        req.ucr_request.bmRequestType = UT_WRITE_CLASS_OTHER;
                        req.ucr_request.bRequest = UR_SET_FEATURE;      // set a feature
                        USETW(req.ucr_request.wIndex, port_num); // usb port number
                        USETW(req.ucr_request.wLength, 0);
                        USETW(req.ucr_request.wValue, UHF_PORT_ENABLE);
                        if (ioctl(fd, USB_REQUEST, &req) != 0) {
                                printf("ioctl USB_REQUEST UR_SET_FEATURE UHF_PORT_ENABLE failed\n");
                                close(fd);
                                exit(EXIT_FAILURE);
                        }

                        // reset
                        bzero(&req, sizeof(req));
                        req.ucr_addr = dev_address;
                        req.ucr_request.bmRequestType = UT_WRITE_CLASS_OTHER;
                        req.ucr_request.bRequest = UR_SET_FEATURE;      // set a feature
                        USETW(req.ucr_request.wIndex, port_num); // usb port number
                        USETW(req.ucr_request.wLength, 0);
                        USETW(req.ucr_request.wValue, UHF_PORT_RESET);
                        if (ioctl(fd, USB_REQUEST, &req) != 0) {
                                printf("ioctl USB_REQUEST UR_SET_FEATURE UHF_PORT_RESET failed\n");
                                close(fd);
                                exit(EXIT_FAILURE);
                        }
                        break;
                case PORT_SUSPEND:
                        // suspend the port
                        bzero(&req, sizeof(req));
                        req.ucr_addr = dev_address;
                        req.ucr_request.bmRequestType = UT_WRITE_CLASS_OTHER;
                        req.ucr_request.bRequest = UR_SET_FEATURE;      // set a feature
                        USETW(req.ucr_request.wIndex, port_num); // usb port number
                        USETW(req.ucr_request.wLength, 0);
                        USETW(req.ucr_request.wValue, UHF_PORT_SUSPEND);
                        if (ioctl(fd, USB_REQUEST, &req) != 0) {
                                printf("ioctl USB_REQUEST UR_SET_FEATURE UHF_PORT_SUSPEND failed\n");
                                close(fd);
                                exit(EXIT_FAILURE);
                        }
                        break;
                case PORT_DISABLE:
                        printf("WARNING! Only use disable if suspend doesn't work!\n");
                        // disable the port
                        bzero(&req, sizeof(req));
                        req.ucr_addr = dev_address; // device address
                        req.ucr_request.bmRequestType = UT_WRITE_CLASS_OTHER;
                        req.ucr_request.bRequest = UR_CLEAR_FEATURE;    // clear a feature
                        USETW(req.ucr_request.wIndex, port_num); // usb port number
                        USETW(req.ucr_request.wLength, 0);
                        USETW(req.ucr_request.wValue, UHF_PORT_ENABLE);
                        if (ioctl(fd, USB_REQUEST, &req) != 0) {
                                printf("ioctl USB_REQUEST UHF_PORT_ENABLE failed\n");
                                close(fd);
                                exit(EXIT_FAILURE);
                        }
                        break;
                default:
                        printf("Unknown action: %d", enable);
                        break;
        }

        close(fd);

        return 0;
}