source: mainline/uspace/lib/usbvirt/src/device.c

/*
 * Copyright (c) 2011 Vojtech Horky
 * 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 libusbvirt
 * @{
 */
/** @file
 * Virtual USB device main routines.
 */

#include <errno.h>
#include <str.h>
#include <stdio.h>
#include <assert.h>
#include <async.h>
#include <devman.h>
#include <usbvirt/device.h>
#include <usbvirt/ipc.h>

#include <usb/debug.h>

/** Current device. */
static usbvirt_device_t *DEV = NULL;

/** Main IPC call handling from virtual host controller.
 *
 * @param icall Initial incoming call
 * @param arg   Local argument
 *
 */
static void callback_connection(ipc_call_t *icall, void *arg)
{
        assert(DEV != NULL);

        async_accept_0(icall);

        while (true) {
                ipc_call_t call;
                async_get_call(&call);

                bool processed = usbvirt_ipc_handle_call(DEV, &call);
                if (!processed) {
                        if (!ipc_get_imethod(&call)) {
                                async_answer_0(&call, EOK);
                                return;
                        } else
                                async_answer_0(&call, EINVAL);
                }
        }
}

/** Connect the device to the virtual host controller.
 *
 * @param dev The virtual device to be (virtually) plugged in.
 * @param vhc_path Devman path to the virtual host controller.
 * @return Error code.
 */
errno_t usbvirt_device_plug(usbvirt_device_t *dev, const char *vhc_path)
{
        if (DEV != NULL)
                return ELIMIT;

        devman_handle_t handle;
        errno_t rc = devman_fun_get_handle(vhc_path, &handle, 0);
        if (rc != EOK)
                return rc;

        async_sess_t *hcd_sess =
            devman_device_connect(handle, 0);
        if (!hcd_sess)
                return ENOMEM;

        DEV = dev;
        dev->vhc_sess = hcd_sess;

        async_exch_t *exch = async_exchange_begin(hcd_sess);

        port_id_t port;
        rc = async_create_callback_port(exch, INTERFACE_USBVIRT_CB, 0, 0,
            callback_connection, NULL, &port);

        async_exchange_end(exch);

        if (rc != EOK)
                DEV = NULL;

        return rc;
}

/** Disconnect the device from virtual host controller.
 *
 * @param dev Device to be disconnected.
 */
void usbvirt_device_unplug(usbvirt_device_t *dev)
{
        async_hangup(dev->vhc_sess);
}

/**
 * @}
 */