source: mainline/uspace/drv/bus/usb/ehci/ehci_rh.c@ e0a5d4c

/*
 * Copyright (c) 2013 Jan Vesely
 * Copyright (c) 2018 Ondrej Hlavaty
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
 */
/** @addtogroup drvusbehci
 * @{
 */
/** @file
 * @brief EHCI driver
 */

#include <assert.h>
#include <errno.h>
#include <mem.h>
#include <str_error.h>
#include <stdint.h>
#include <stddef.h>

#include <usb/classes/hub.h>
#include <usb/debug.h>
#include <usb/descriptor.h>
#include <usb/request.h>
#include <usb/usb.h>

#include <usb/host/endpoint.h>
#include <usbvirt/device.h>

#include "ehci_rh.h"

enum {
        HUB_STATUS_CHANGE_PIPE = 1,
};

static usbvirt_device_ops_t ops;

/** Initialize internal USB HUB class descriptor.
 * @param instance EHCI root hub.
 * Use register based info to create accurate descriptor.
 */
static void ehci_rh_hub_desc_init(ehci_rh_t *instance, unsigned hcs)
{
        assert(instance);
        const unsigned dsize = sizeof(usb_hub_descriptor_header_t) +
            STATUS_BYTES(instance->port_count) * 2;
        assert(dsize <= sizeof(instance->hub_descriptor));

        instance->hub_descriptor.header.length = dsize;
        instance->hub_descriptor.header.descriptor_type = USB_DESCTYPE_HUB;
        instance->hub_descriptor.header.port_count = instance->port_count;
        /* Bits 0,1 indicate power switching mode
         * Bit 2 indicates device type (compound device)
         * Bits 3,4 indicate over-current protection mode */
        instance->hub_descriptor.header.characteristics = 0 |
            ((hcs & EHCI_CAPS_HCS_PPC_FLAG) ? 0x09 : 0x12) |
            ((hcs & EHCI_CAPS_HCS_INDICATORS_FLAG) ? 0x80 : 0) |
            (0x3 << 5); /* Need 32 FS bit times */ // TODO Implement
        instance->hub_descriptor.header.characteristics_reserved = 0;
        instance->hub_descriptor.header.power_good_time = 50;
        /* bHubContrCurrent, root hubs don't need no power. */
        instance->hub_descriptor.header.max_current = 0;

        /* Device removable and some legacy 1.0 stuff*/
        instance->hub_descriptor.rempow[0] = 0xff;
        instance->hub_descriptor.rempow[1] = 0xff;
        instance->hub_descriptor.rempow[2] = 0xff;
        instance->hub_descriptor.rempow[3] = 0xff;

}
/** Initialize EHCI root hub.
 * @param instance Place to initialize.
 * @param regs EHCI device registers.
 * @param name Device name.
 * return Error code, EOK on success.
 *
 * Selects preconfigured port powering mode, sets up descriptor, and
 * initializes internal virtual hub.
 */
errno_t ehci_rh_init(ehci_rh_t *instance, ehci_caps_regs_t *caps, ehci_regs_t *regs,
    fibril_mutex_t *guard, const char *name)
{
        assert(instance);
        instance->registers = regs;
        instance->port_count =
            (EHCI_RD(caps->hcsparams) >> EHCI_CAPS_HCS_N_PORTS_SHIFT) &
            EHCI_CAPS_HCS_N_PORTS_MASK;
        usb_log_debug2("RH(%p): hcsparams: %x.", instance,
            EHCI_RD(caps->hcsparams));
        usb_log_info("RH(%p): Found %u ports.", instance,
            instance->port_count);

        if (EHCI_RD(caps->hcsparams) & EHCI_CAPS_HCS_PPC_FLAG) {
                usb_log_info("RH(%p): Per-port power switching.", instance);
        } else {
                usb_log_info("RH(%p): No power switching.", instance);
        }
        for (unsigned i = 0; i < instance->port_count; ++i)
                usb_log_debug2("RH(%p-%u): status: %"PRIx32, instance, i,
                    EHCI_RD(regs->portsc[i]));

        for (unsigned i = 0; i < EHCI_MAX_PORTS; ++i) {
                instance->reset_flag[i] = false;
                instance->resume_flag[i] = false;
        }

        ehci_rh_hub_desc_init(instance, EHCI_RD(caps->hcsparams));
        instance->guard = guard;
        instance->status_change_endpoint = NULL;

        return virthub_base_init(&instance->base, name, &ops, instance,
            NULL, &instance->hub_descriptor.header, HUB_STATUS_CHANGE_PIPE);
}

/** Schedule USB request.
 * @param instance OCHI root hub instance.
 * @param batch USB requst batch to schedule.
 * @return Always EOK.
 * Most requests complete even before this function returns,
 * status change requests might be postponed until there is something to report.
 */
errno_t ehci_rh_schedule(ehci_rh_t *instance, usb_transfer_batch_t *batch)
{
        assert(instance);
        assert(batch);
        batch->error = virthub_base_request(&instance->base, batch->target,
            batch->dir, (void*) batch->setup.buffer,
            batch->dma_buffer.virt, batch->size,
            &batch->transferred_size);
        if (batch->error == ENAK) {
                usb_log_debug("RH(%p): BATCH(%p) adding as unfinished",
                    instance, batch);

                /* Lock the HC guard */
                fibril_mutex_lock(instance->guard);
                const int err = endpoint_activate_locked(batch->ep, batch);
                if (err) {
                        fibril_mutex_unlock(batch->ep->guard);
                        return err;
                }

                /*
                 * Asserting that the HC do not run two instances of the status
                 * change endpoint - shall be true.
                 */
                assert(!instance->status_change_endpoint);

                endpoint_add_ref(batch->ep);
                instance->status_change_endpoint = batch->ep;
                fibril_mutex_unlock(instance->guard);
        } else {
                usb_log_debug("RH(%p): BATCH(%p) virtual request complete: %s",
                    instance, batch, str_error(batch->error));
                usb_transfer_batch_finish(batch);
        }
        return EOK;
}

/** Handle EHCI RHSC interrupt.
 * @param instance EHCI root hub isntance.
 * @return Always EOK.
 *
 * Interrupt means there is a change of status to report. It may trigger
 * processing of a postponed request.
 */
errno_t ehci_rh_interrupt(ehci_rh_t *instance)
{
        fibril_mutex_lock(instance->guard);
        endpoint_t *ep = instance->status_change_endpoint;
        if (!ep) {
                fibril_mutex_unlock(instance->guard);
                return EOK;
        }

        usb_transfer_batch_t * const batch = ep->active_batch;
        endpoint_deactivate_locked(ep);
        instance->status_change_endpoint = NULL;
        fibril_mutex_unlock(instance->guard);

        endpoint_del_ref(ep);

        if (batch) {
                usb_log_debug2("RH(%p): Interrupt. Processing batch: %p",
                    instance, batch);
                batch->error = virthub_base_request(&instance->base, batch->target,
                    batch->dir, (void*) batch->setup.buffer,
                    batch->dma_buffer.virt, batch->size,
                    &batch->transferred_size);
                usb_transfer_batch_finish(batch);
        }
        return EOK;
}

/* HUB ROUTINES IMPLEMENTATION */
#define TEST_SIZE_INIT(size, port, hub) \
do { \
        hub = virthub_get_data(device); \
        assert(hub);\
        if (uint16_usb2host(setup_packet->length) != size) \
                return ESTALL; \
        port = uint16_usb2host(setup_packet->index) - 1; \
        if (port > hub->port_count) \
                return EINVAL; \
} while (0)

/** Hub status request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_get_status(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ehci_rh_t *hub = virthub_get_data(device);
        assert(hub);
        if (uint16_usb2host(setup_packet->length) != 4)
                return ESTALL;
        /* ECHI RH does not report global OC, and local power is always good */
        const uint32_t val = 0;
        memcpy(data, &val, sizeof(val));
        *act_size = sizeof(val);
        return EOK;
}

/** Hub set feature request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_clear_hub_feature(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ehci_rh_t *hub = virthub_get_data(device);
        assert(hub);

        /*
         * Chapter 11.16.2 specifies that only C_HUB_LOCAL_POWER and
         * C_HUB_OVER_CURRENT are supported.
         * C_HUB_LOCAL_POWER is not supported because root hubs do not support
         * local power status feature.
         * EHCI RH does not report global OC condition either
         */
        return ESTALL;
}

#define BIT_VAL(val, bit)   ((val & bit) ? 1 : 0)
#define EHCI2USB(val, bit, mask)   (BIT_VAL(val, bit) ? mask : 0)

/** Port status request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_get_port_status(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ehci_rh_t *hub;
        unsigned port;
        TEST_SIZE_INIT(4, port, hub);
        if (setup_packet->value != 0)
                return EINVAL;

        const uint32_t reg = EHCI_RD(hub->registers->portsc[port]);
        const uint32_t status = uint32_host2usb(
            EHCI2USB(reg, USB_PORTSC_CONNECT_FLAG, USB_HUB_PORT_STATUS_CONNECTION) |
            EHCI2USB(reg, USB_PORTSC_ENABLED_FLAG, USB_HUB_PORT_STATUS_ENABLE) |
            EHCI2USB(reg, USB_PORTSC_SUSPEND_FLAG, USB2_HUB_PORT_STATUS_SUSPEND) |
            EHCI2USB(reg, USB_PORTSC_OC_ACTIVE_FLAG, USB_HUB_PORT_STATUS_OC) |
            EHCI2USB(reg, USB_PORTSC_PORT_RESET_FLAG, USB_HUB_PORT_STATUS_RESET) |
            EHCI2USB(reg, USB_PORTSC_PORT_POWER_FLAG, USB2_HUB_PORT_STATUS_POWER) |
            (((reg & USB_PORTSC_LINE_STATUS_MASK) == USB_PORTSC_LINE_STATUS_K) ?
                (USB2_HUB_PORT_STATUS_LOW_SPEED) : 0) |
            ((reg & USB_PORTSC_PORT_OWNER_FLAG) ? 0 : USB2_HUB_PORT_STATUS_HIGH_SPEED) |
            EHCI2USB(reg, USB_PORTSC_PORT_TEST_MASK, USB2_HUB_PORT_STATUS_TEST) |
            EHCI2USB(reg, USB_PORTSC_INDICATOR_MASK, USB2_HUB_PORT_STATUS_INDICATOR) |
            EHCI2USB(reg, USB_PORTSC_CONNECT_CH_FLAG, USB_HUB_PORT_STATUS_C_CONNECTION) |
            EHCI2USB(reg, USB_PORTSC_EN_CHANGE_FLAG, USB2_HUB_PORT_STATUS_C_ENABLE) |
            (hub->resume_flag[port] ? USB2_HUB_PORT_STATUS_C_SUSPEND : 0) |
            EHCI2USB(reg, USB_PORTSC_OC_CHANGE_FLAG, USB_HUB_PORT_STATUS_C_OC) |
            (hub->reset_flag[port] ? USB_HUB_PORT_STATUS_C_RESET: 0)
        );
        /* Note feature numbers for test and indicator feature do not
         * correspond to the port status bit locations */
        usb_log_debug2("RH(%p-%u) port status: %"PRIx32"(%"PRIx32")", hub, port,
            status, reg);
        memcpy(data, &status, sizeof(status));
        *act_size = sizeof(status);
        return EOK;
}

typedef struct {
        ehci_rh_t *hub;
        unsigned port;
} ehci_rh_job_t;

static errno_t stop_reset(void *arg)
{
        ehci_rh_job_t *job = arg;
        async_usleep(50000);
        usb_log_debug("RH(%p-%u): Clearing reset", job->hub, job->port);
        EHCI_CLR(job->hub->registers->portsc[job->port],
            USB_PORTSC_PORT_RESET_FLAG);
        /* wait for reset to complete */
        while (EHCI_RD(job->hub->registers->portsc[job->port]) &
            USB_PORTSC_PORT_RESET_FLAG) {
                async_usleep(1);
        };
        usb_log_debug("RH(%p-%u): Reset complete", job->hub, job->port);
        /* Handle port ownership, if the port is not enabled
         * after reset it's a full speed device */
        if (!(EHCI_RD(job->hub->registers->portsc[job->port]) &
            USB_PORTSC_ENABLED_FLAG)) {
                usb_log_info("RH(%p-%u): Port not enabled after reset (%"PRIX32
                    "), giving up ownership", job->hub, job->port,
                    EHCI_RD(job->hub->registers->portsc[job->port]));
                EHCI_SET(job->hub->registers->portsc[job->port],
                    USB_PORTSC_PORT_OWNER_FLAG);
        }
        job->hub->reset_flag[job->port] = true;
        ehci_rh_interrupt(job->hub);
        free(job);
        return 0;
}

static errno_t stop_resume(void *arg)
{
        ehci_rh_job_t *job = arg;
        async_usleep(20000);
        usb_log_debug("RH(%p-%u): Stopping resume", job->hub, job->port);
        EHCI_CLR(job->hub->registers->portsc[job->port],
            USB_PORTSC_RESUME_FLAG);
        job->hub->resume_flag[job->port] = true;
        ehci_rh_interrupt(job->hub);
        free(job);
        return 0;
}

static errno_t delayed_job(errno_t (*func)(void*), ehci_rh_t *rh, unsigned port)
{
        ehci_rh_job_t *job = malloc(sizeof(*job));
        if (!job)
                return ENOMEM;
        job->hub = rh;
        job->port = port;
        fid_t fib = fibril_create(func, job);
        if (!fib) {
                free(job);
                return ENOMEM;
        }
        fibril_add_ready(fib);
        usb_log_debug2("RH(%p-%u): Scheduled delayed stop job.", rh, port);
        return EOK;
}


/** Port clear feature request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_clear_port_feature(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ehci_rh_t *hub;
        unsigned port;
        TEST_SIZE_INIT(0, port, hub);
        const unsigned feature = uint16_usb2host(setup_packet->value);
        /* Enabled features to clear: see page 269 of USB specs */
        switch (feature)
        {
        case USB_HUB_FEATURE_PORT_POWER:          /*8*/
                usb_log_debug2("RH(%p-%u): Clear port power.", hub, port);
                EHCI_CLR(hub->registers->portsc[port],
                    USB_PORTSC_PORT_POWER_FLAG);
                return EOK;

        case USB2_HUB_FEATURE_PORT_ENABLE:         /*1*/
                usb_log_debug2("RH(%p-%u): Clear port enable.", hub, port);
                EHCI_CLR(hub->registers->portsc[port],
                    USB_PORTSC_ENABLED_FLAG);
                return EOK;

        case USB2_HUB_FEATURE_PORT_SUSPEND:        /*2*/
                usb_log_debug2("RH(%p-%u): Clear port suspend.", hub, port);
                /* If not in suspend it's noop */
                if ((EHCI_RD(hub->registers->portsc[port]) &
                    USB_PORTSC_SUSPEND_FLAG) == 0)
                    return EOK;
                /* Host driven resume */
                EHCI_SET(hub->registers->portsc[port],
                    USB_PORTSC_RESUME_FLAG);
                //TODO: What if creating the delayed job fails?
                return delayed_job(stop_resume, hub, port);

        case USB_HUB_FEATURE_C_PORT_CONNECTION:   /*16*/
                usb_log_debug2("RH(%p-%u): Clear port connection change.",
                    hub, port);
                EHCI_SET(hub->registers->portsc[port],
                    USB_PORTSC_CONNECT_CH_FLAG);
                return EOK;
        case USB2_HUB_FEATURE_C_PORT_ENABLE:       /*17*/
                usb_log_debug2("RH(%p-%u): Clear port enable change.",
                    hub, port);
                EHCI_SET(hub->registers->portsc[port],
                    USB_PORTSC_CONNECT_CH_FLAG);
                return EOK;
        case USB_HUB_FEATURE_C_PORT_OVER_CURRENT: /*19*/
                usb_log_debug2("RH(%p-%u): Clear port OC change.",
                    hub, port);
                EHCI_SET(hub->registers->portsc[port],
                    USB_PORTSC_OC_CHANGE_FLAG);
                return EOK;
        case USB2_HUB_FEATURE_C_PORT_SUSPEND:      /*18*/
                usb_log_debug2("RH(%p-%u): Clear port suspend change.",
                    hub, port);
                hub->resume_flag[port] = false;
                return EOK;
        case USB_HUB_FEATURE_C_PORT_RESET:        /*20*/
                usb_log_debug2("RH(%p-%u): Clear port reset change.",
                    hub, port);
                hub->reset_flag[port] = false;
                return EOK;

        default:
                usb_log_warning("RH(%p-%u): Clear unknown feature: %u",
                    hub, port, feature);
                return ENOTSUP;
        }
}

/** Port set feature request handler.
 * @param device Virtual hub device
 * @param setup_packet USB setup stage data.
 * @param[out] data destination data buffer, size must be at least
 *             setup_packet->length bytes
 * @param[out] act_size Sized of the valid response part of the buffer.
 * @return Error code.
 */
static errno_t req_set_port_feature(usbvirt_device_t *device,
    const usb_device_request_setup_packet_t *setup_packet,
    uint8_t *data, size_t *act_size)
{
        ehci_rh_t *hub;
        unsigned port;
        TEST_SIZE_INIT(0, port, hub);
        const unsigned feature = uint16_usb2host(setup_packet->value);
        switch (feature) {
        case USB2_HUB_FEATURE_PORT_ENABLE:  /*1*/
                usb_log_debug2("RH(%p-%u): Set port enable.", hub, port);
                EHCI_SET(hub->registers->portsc[port],
                    USB_PORTSC_ENABLED_FLAG);
                return EOK;
        case USB2_HUB_FEATURE_PORT_SUSPEND: /*2*/
                usb_log_debug2("RH(%p-%u): Set port suspend.", hub, port);
                EHCI_SET(hub->registers->portsc[port],
                    USB_PORTSC_SUSPEND_FLAG);
                return EOK;
        case USB_HUB_FEATURE_PORT_RESET:   /*4*/
                usb_log_debug2("RH(%p-%u): Set port reset.", hub, port);
                EHCI_SET(hub->registers->portsc[port],
                    USB_PORTSC_PORT_RESET_FLAG);
                //TODO: What if creating the delayed job fails?
                return delayed_job(stop_reset, hub, port);
        case USB_HUB_FEATURE_PORT_POWER:   /*8*/
                usb_log_debug2("RH(%p-%u): Set port power.", hub, port);
                EHCI_SET(hub->registers->portsc[port],
                    USB_PORTSC_PORT_POWER_FLAG);
                return EOK;
        default:
                usb_log_warning("RH(%p-%u): Set unknown feature: %u",
                    hub, port, feature);
                return ENOTSUP;
        }
}

/** Status change handler.
 * @param device Virtual hub device
 * @param endpoint Endpoint number
 * @param tr_type Transfer type
 * @param buffer Response destination
 * @param buffer_size Bytes available in buffer
 * @param actual_size Size us the used part of the dest buffer.
 *
 * Produces status mask. Bit 0 indicates hub status change the other bits
 * represent port status change. Endian does not matter as UHCI root hubs
 * only need 1 byte.
 */
static errno_t req_status_change_handler(usbvirt_device_t *device,
    usb_endpoint_t endpoint, usb_transfer_type_t tr_type,
    void *buffer, size_t buffer_size, size_t *actual_size)
{
        ehci_rh_t *hub = virthub_get_data(device);
        assert(hub);

        if (buffer_size < STATUS_BYTES(hub->port_count))
                return ESTALL;

        uint16_t mask = 0;
        for (unsigned port = 0; port < hub->port_count; ++port) {
                /* Write-clean bits are those that indicate change */
                uint32_t status = EHCI_RD(hub->registers->portsc[port]);
                if ((status & USB_PORTSC_WC_MASK) || hub->reset_flag[port]) {
                        /* Ignore new LS device */
                        if ((status & USB_PORTSC_CONNECT_CH_FLAG) &&
                            (status & USB_PORTSC_LINE_STATUS_MASK) ==
                                USB_PORTSC_LINE_STATUS_K)
                                EHCI_SET(hub->registers->portsc[port],
                                    USB_PORTSC_PORT_OWNER_FLAG);
                        else
                                mask |= (2 << port);
                }
        }

        usb_log_debug2("RH(%p): root hub interrupt mask: %"PRIx16, hub, mask);

        if (mask == 0)
                return ENAK;
        mask = uint16_host2usb(mask);
        memcpy(buffer, &mask, STATUS_BYTES(hub->port_count));
        *actual_size = STATUS_BYTES(hub->port_count);
        return EOK;
}

/** EHCI root hub request handlers */
static const usbvirt_control_request_handler_t control_transfer_handlers[] = {
        {
                STD_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_DEVREQ_GET_DESCRIPTOR),
                .name = "GetDescriptor",
                .callback = virthub_base_get_hub_descriptor,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_DEVREQ_GET_DESCRIPTOR),
                .name = "GetDescriptor",
                .callback = virthub_base_get_hub_descriptor,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_GET_DESCRIPTOR),
                .name = "GetHubDescriptor",
                .callback = virthub_base_get_hub_descriptor,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_OTHER, USB_HUB_REQUEST_GET_STATUS),
                .name = "GetPortStatus",
                .callback = req_get_port_status,
        },
        {
                CLASS_REQ_OUT(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_CLEAR_FEATURE),
                .name = "ClearHubFeature",
                .callback = req_clear_hub_feature,
        },
        {
                CLASS_REQ_OUT(USB_REQUEST_RECIPIENT_OTHER, USB_HUB_REQUEST_CLEAR_FEATURE),
                .name = "ClearPortFeature",
                .callback = req_clear_port_feature,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_GET_STATUS),
                .name = "GetHubStatus",
                .callback = req_get_status,
        },
        {
                CLASS_REQ_IN(USB_REQUEST_RECIPIENT_OTHER, USB_HUB_REQUEST_GET_STATUS),
                .name = "GetPortStatus",
                .callback = req_get_port_status,
        },
        {
                CLASS_REQ_OUT(USB_REQUEST_RECIPIENT_DEVICE, USB_HUB_REQUEST_SET_FEATURE),
                .name = "SetHubFeature",
                .callback = req_nop,
        },
        {
                CLASS_REQ_OUT(USB_REQUEST_RECIPIENT_OTHER, USB_HUB_REQUEST_SET_FEATURE),
                .name = "SetPortFeature",
                .callback = req_set_port_feature,
        },
        {
                .callback = NULL
        }
};

/** Virtual EHCI root hub ops */
static usbvirt_device_ops_t ops = {
        .control = control_transfer_handlers,
        .data_in[HUB_STATUS_CHANGE_PIPE] = req_status_change_handler,
};