source: mainline/uspace/lib/usbhost/src/hcd.c@ 03936831

/*
 * Copyright (c) 2011 Jan Vesely
 * 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
 *
 */

#include <usb/debug.h>
#include <usb/request.h>

#include <assert.h>
#include <async.h>
#include <errno.h>
#include <usb_iface.h>

#include "hcd.h"


/** Initialize hcd_t structure.
 * Initializes device and endpoint managers. Sets data and hook pointer to NULL.
 *
 * @param hcd hcd_t structure to initialize, non-null.
 * @param max_speed Maximum supported USB speed (full, high).
 * @param bandwidth Available bandwidth, passed to endpoint manager.
 * @param bw_count Bandwidth compute function, passed to endpoint manager.
 */
void hcd_init(hcd_t *hcd) {
        assert(hcd);

        hcd_set_implementation(hcd, NULL, NULL, NULL);
}

usb_address_t hcd_request_address(hcd_t *hcd, usb_speed_t speed)
{
        assert(hcd);
        usb_address_t address = 0;
        const int ret = bus_request_address(hcd->bus, &address, false, speed);
        if (ret != EOK)
                return ret;
        return address;
}

typedef struct {
        void *original_data;
        usbhc_iface_transfer_out_callback_t original_callback;
        usb_target_t target;
        hcd_t *hcd;
} toggle_t;

static void toggle_reset_callback(int retval, void *arg)
{
        assert(arg);
        toggle_t *toggle = arg;
        if (retval == EOK) {
                usb_log_debug2("Reseting toggle on %d:%d.\n",
                    toggle->target.address, toggle->target.endpoint);
                bus_reset_toggle(toggle->hcd->bus,
                    toggle->target, toggle->target.endpoint == 0);
        }

        toggle->original_callback(retval, toggle->original_data);
}

/** Prepare generic usb_transfer_batch and schedule it.
 * @param hcd Host controller driver.
 * @param fun DDF fun
 * @param target address and endpoint number.
 * @param setup_data Data to use in setup stage (Control communication type)
 * @param in Callback for device to host communication.
 * @param out Callback for host to device communication.
 * @param arg Callback parameter.
 * @param name Communication identifier (for nicer output).
 * @return Error code.
 */
int hcd_send_batch(
    hcd_t *hcd, usb_target_t target, usb_direction_t direction,
    void *data, size_t size, uint64_t setup_data,
    usbhc_iface_transfer_in_callback_t in,
    usbhc_iface_transfer_out_callback_t out, void *arg, const char* name)
{
        assert(hcd);

        endpoint_t *ep = bus_find_endpoint(hcd->bus, target, direction);
        if (ep == NULL) {
                usb_log_error("Endpoint(%d:%d) not registered for %s.\n",
                    target.address, target.endpoint, name);
                return ENOENT;
        }

        usb_log_debug2("%s %d:%d %zu(%zu).\n",
            name, target.address, target.endpoint, size, ep->max_packet_size);

        const size_t bw = bus_count_bw(ep, size);
        /* Check if we have enough bandwidth reserved */
        if (ep->bandwidth < bw) {
                usb_log_error("Endpoint(%d:%d) %s needs %zu bw "
                    "but only %zu is reserved.\n",
                    ep->target.address, ep->target.endpoint, name, bw, ep->bandwidth);
                return ENOSPC;
        }
        if (!hcd->ops.schedule) {
                usb_log_error("HCD does not implement scheduler.\n");
                return ENOTSUP;
        }

        /* Check for commands that reset toggle bit */
        if (ep->transfer_type == USB_TRANSFER_CONTROL) {
                const int reset_toggle = usb_request_needs_toggle_reset(
                    (usb_device_request_setup_packet_t *) &setup_data);
                if (reset_toggle >= 0) {
                        assert(out);
                        toggle_t *toggle = malloc(sizeof(toggle_t));
                        if (!toggle)
                                return ENOMEM;
                        toggle->target.address = target.address;
                        toggle->target.endpoint = reset_toggle;
                        toggle->original_callback = out;
                        toggle->original_data = arg;
                        toggle->hcd = hcd;

                        arg = toggle;
                        out = toggle_reset_callback;
                }
        }

        usb_transfer_batch_t *batch = usb_transfer_batch_create(
            ep, data, size, setup_data, in, out, arg);
        if (!batch) {
                usb_log_error("Failed to create transfer batch.\n");
                return ENOMEM;
        }

        const int ret = hcd->ops.schedule(hcd, batch);
        if (ret != EOK)
                usb_transfer_batch_destroy(batch);

        /* Drop our own reference to ep. */
        endpoint_del_ref(ep);

        return ret;
}

typedef struct {
        fibril_mutex_t done_mtx;
        fibril_condvar_t done_cv;
        unsigned done;
        int ret;
        size_t size;
} sync_data_t;

static void transfer_in_cb(int ret, size_t size, void* data)
{
        sync_data_t *d = data;
        assert(d);
        d->ret = ret;
        d->size = size;
        fibril_mutex_lock(&d->done_mtx);
        d->done = 1;
        fibril_condvar_broadcast(&d->done_cv);
        fibril_mutex_unlock(&d->done_mtx);
}

static void transfer_out_cb(int ret, void* data)
{
        sync_data_t *d = data;
        assert(data);
        d->ret = ret;
        fibril_mutex_lock(&d->done_mtx);
        d->done = 1;
        fibril_condvar_broadcast(&d->done_cv);
        fibril_mutex_unlock(&d->done_mtx);
}

/** this is really ugly version of sync usb communication */
ssize_t hcd_send_batch_sync(
    hcd_t *hcd, usb_target_t target, usb_direction_t dir,
    void *data, size_t size, uint64_t setup_data, const char* name)
{
        assert(hcd);
        sync_data_t sd = { .done = 0, .ret = EBUSY, .size = size };
        fibril_mutex_initialize(&sd.done_mtx);
        fibril_condvar_initialize(&sd.done_cv);

        const int ret = hcd_send_batch(hcd, target, dir, data, size, setup_data,
            dir == USB_DIRECTION_IN ? transfer_in_cb : NULL,
            dir == USB_DIRECTION_OUT ? transfer_out_cb : NULL, &sd, name);
        if (ret != EOK)
                return ret;

        fibril_mutex_lock(&sd.done_mtx);
        while (!sd.done)
                fibril_condvar_wait(&sd.done_cv, &sd.done_mtx);
        fibril_mutex_unlock(&sd.done_mtx);

        if (sd.ret == EOK)
                return sd.size;
        return sd.ret;
}


/**
 * @}
 */