source: mainline/uspace/lib/usbhost/src/endpoint.c@ 837d53d

/*
 * Copyright (c) 2011 Jan Vesely
 * Copyright (c) 2017 Ondrej Hlavaty <aearsis@eideo.cz>
 * 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 libusbhost
 * @{
 */
/** @file
 * @brief UHCI host controller driver structure
 */

#include <assert.h>
#include <atomic.h>
#include <mem.h>
#include <stdlib.h>

#include "usb_transfer_batch.h"
#include "bus.h"

#include "endpoint.h"

/** Initialize provided endpoint structure.
 */
void endpoint_init(endpoint_t *ep, device_t *dev, const usb_endpoint_desc_t *desc)
{
        memset(ep, 0, sizeof(endpoint_t));

        assert(dev);
        ep->device = dev;

        atomic_set(&ep->refcnt, 0);
        link_initialize(&ep->link);
        fibril_mutex_initialize(&ep->guard);
        fibril_condvar_initialize(&ep->avail);

        ep->endpoint = desc->endpoint_no;
        ep->direction = desc->direction;
        ep->transfer_type = desc->transfer_type;
        ep->max_packet_size = desc->max_packet_size;
        ep->packets = desc->packets;

        ep->bandwidth = endpoint_count_bw(ep, desc->max_packet_size);
}

static inline const bus_ops_t *get_bus_ops(endpoint_t *ep)
{
        return ep->device->bus->ops;
}

void endpoint_add_ref(endpoint_t *ep)
{
        atomic_inc(&ep->refcnt);
}

static inline void endpoint_destroy(endpoint_t *ep)
{
        const bus_ops_t *ops = BUS_OPS_LOOKUP(get_bus_ops(ep), endpoint_destroy);
        if (ops) {
                ops->endpoint_destroy(ep);
        } else {
                assert(ep->active_batch == NULL);

                /* Assume mostly the eps will be allocated by malloc. */
                free(ep);
        }
}

void endpoint_del_ref(endpoint_t *ep)
{
        if (atomic_predec(&ep->refcnt) == 0) {
                endpoint_destroy(ep);
        }
}

/** Mark the endpoint as active and block access for further fibrils.
 * @param ep endpoint_t structure.
 */
void endpoint_activate_locked(endpoint_t *ep, usb_transfer_batch_t *batch)
{
        assert(ep);
        assert(batch);
        assert(batch->ep == ep);
        assert(fibril_mutex_is_locked(&ep->guard));

        while (ep->active_batch != NULL)
                fibril_condvar_wait(&ep->avail, &ep->guard);
        ep->active_batch = batch;
}

/** Mark the endpoint as inactive and allow access for further fibrils.
 * @param ep endpoint_t structure.
 */
void endpoint_deactivate_locked(endpoint_t *ep)
{
        assert(ep);
        assert(fibril_mutex_is_locked(&ep->guard));

        if (ep->active_batch && ep->active_batch->error == EOK)
                usb_transfer_batch_reset_toggle(ep->active_batch);

        ep->active_batch = NULL;
        fibril_condvar_signal(&ep->avail);
}

/** Abort an active batch on endpoint, if any.
 *
 * @param[in] ep endpoint_t structure.
 */
void endpoint_abort(endpoint_t *ep)
{
        assert(ep);

        fibril_mutex_lock(&ep->guard);
        usb_transfer_batch_t *batch = ep->active_batch;
        endpoint_deactivate_locked(ep);
        fibril_mutex_unlock(&ep->guard);

        if (batch)
                usb_transfer_batch_abort(batch);
}

/** Get the value of toggle bit. Either uses the toggle_get op, or just returns
 * the value of the toggle.
 * @param ep endpoint_t structure.
 */
int endpoint_toggle_get(endpoint_t *ep)
{
        assert(ep);

        const bus_ops_t *ops = BUS_OPS_LOOKUP(get_bus_ops(ep), endpoint_get_toggle);
        return ops
            ? ops->endpoint_get_toggle(ep)
            : ep->toggle;
}

/** Set the value of toggle bit. Either uses the toggle_set op, or just sets
 * the toggle inside.
 * @param ep endpoint_t structure.
 */
void endpoint_toggle_set(endpoint_t *ep, bool toggle)
{
        assert(ep);

        const bus_ops_t *ops = BUS_OPS_LOOKUP(get_bus_ops(ep), endpoint_set_toggle);
        if (ops) {
                ops->endpoint_set_toggle(ep, toggle);
        }
        else {
                ep->toggle = toggle;
        }
}

ssize_t endpoint_count_bw(endpoint_t *ep, size_t packet_size)
{
        assert(ep);

        const bus_ops_t *ops = BUS_OPS_LOOKUP(get_bus_ops(ep), endpoint_count_bw);
        if (!ops)
                return 0;

        return ops->endpoint_count_bw(ep, packet_size);
}

/**
 * @}
 */