source: mainline/uspace/lib/usb/src/usbdevice.c@ eb1a2f4

/*
 * 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 libusb
 * @{
 */
/** @file
 * General communication between device drivers and host controller driver.
 */
#include <devman.h>
#include <async.h>
#include <usb_iface.h>
#include <usb/usbdevice.h>
#include <usb/debug.h>
#include <errno.h>
#include <assert.h>

/** Find host controller handle that is ancestor of given device.
 *
 * @param[in] device_handle Device devman handle.
 * @param[out] hc_handle Where to store handle of host controller
 *      controlling device with @p device_handle handle.
 * @return Error code.
 */
int usb_hc_find(devman_handle_t device_handle, devman_handle_t *hc_handle)
{
        int parent_phone = devman_parent_device_connect(device_handle,
            IPC_FLAG_BLOCKING);
        if (parent_phone < 0) {
                return parent_phone;
        }

        devman_handle_t h;
        usb_log_debug("asking for HC handle (my handle is %zu).\n", device_handle);
        int rc = async_req_1_1(parent_phone, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_GET_HOST_CONTROLLER_HANDLE, &h);

        async_hangup(parent_phone);

        if (rc != EOK) {
                return rc;
        }

        if (hc_handle != NULL) {
                *hc_handle = h;
        }

        return EOK;
}

/** Initialize connection to USB host controller.
 *
 * @param connection Connection to be initialized.
 * @param device Device connecting to the host controller.
 * @return Error code.
 */
int usb_hc_connection_initialize_from_device(usb_hc_connection_t *connection,
    ddf_dev_t *device)
{
        assert(connection);

        if (device == NULL) {
                return EBADMEM;
        }

        devman_handle_t hc_handle;
        int rc = usb_hc_find(device->handle, &hc_handle);
        if (rc != EOK) {
                return rc;
        }

        rc = usb_hc_connection_initialize(connection, hc_handle);

        return rc;
}

/** Manually initialize connection to USB host controller.
 *
 * @param connection Connection to be initialized.
 * @param hc_handle Devman handle of the host controller.
 * @return Error code.
 */
int usb_hc_connection_initialize(usb_hc_connection_t *connection,
    devman_handle_t hc_handle)
{
        assert(connection);

        connection->hc_handle = hc_handle;
        connection->hc_phone = -1;

        return EOK;
}

/** Open connection to host controller.
 *
 * @param connection Connection to the host controller.
 * @return Error code.
 */
int usb_hc_connection_open(usb_hc_connection_t *connection)
{
        assert(connection);

        if (usb_hc_connection_is_opened(connection)) {
                return EBUSY;
        }

        int phone = devman_device_connect(connection->hc_handle, 0);
        if (phone < 0) {
                return phone;
        }

        connection->hc_phone = phone;

        return EOK;
}

/** Tells whether connection to host controller is opened.
 *
 * @param connection Connection to the host controller.
 * @return Whether connection is opened.
 */
bool usb_hc_connection_is_opened(const usb_hc_connection_t *connection)
{
        assert(connection);

        return (connection->hc_phone >= 0);
}

/** Close connection to the host controller.
 *
 * @param connection Connection to the host controller.
 * @return Error code.
 */
int usb_hc_connection_close(usb_hc_connection_t *connection)
{
        assert(connection);

        if (!usb_hc_connection_is_opened(connection)) {
                return ENOENT;
        }

        int rc = async_hangup(connection->hc_phone);
        if (rc != EOK) {
                return rc;
        }

        connection->hc_phone = -1;

        return EOK;
}

/**
 * @}
 */