source: mainline/uspace/lib/usb/src/hc.c@ d3ce33fa

/*
 * 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 with host controller driver (implementation).
 */
#include <devman.h>
#include <async.h>
#include <dev_iface.h>
#include <usb_iface.h>
#include <usbhc_iface.h>
#include <usb/hc.h>
#include <usb/debug.h>
#include <errno.h>
#include <assert.h>

/** 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_sess = NULL;

        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;
        
        async_sess_t *sess = devman_device_connect(EXCHANGE_ATOMIC,
            connection->hc_handle, 0);
        if (!sess)
                return ENOMEM;
        
        connection->hc_sess = sess;
        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_sess != NULL);
}

/** 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_sess);
        if (rc != EOK) {
                return rc;
        }

        connection->hc_sess = NULL;

        return EOK;
}

/** Get handle of USB device with given address.
 *
 * @param[in] connection Opened connection to host controller.
 * @param[in] address Address of device in question.
 * @param[out] handle Where to write the device handle.
 * @return Error code.
 */
int usb_hc_get_handle_by_address(usb_hc_connection_t *connection,
    usb_address_t address, devman_handle_t *handle)
{
        if (!usb_hc_connection_is_opened(connection))
                return ENOENT;
        
        async_exch_t *exch = async_exchange_begin(connection->hc_sess);
        
        sysarg_t tmp;
        int rc = async_req_2_1(exch, DEV_IFACE_ID(USBHC_DEV_IFACE),
            IPC_M_USBHC_GET_HANDLE_BY_ADDRESS,
            address, &tmp);
        
        async_exchange_end(exch);
        
        if ((rc == EOK) && (handle != NULL))
                *handle = tmp;
        
        return rc;
}

/** Tell USB address assigned to device with given handle.
 *
 * @param dev_handle Devman handle of the USB device in question.
 * @return USB address or negative error code.
 */
usb_address_t usb_hc_get_address_by_handle(devman_handle_t dev_handle)
{
        async_sess_t *parent_sess =
            devman_parent_device_connect(EXCHANGE_ATOMIC, dev_handle,
            IPC_FLAG_BLOCKING);
        if (!parent_sess)
                return ENOMEM;
        
        async_exch_t *exch = async_exchange_begin(parent_sess);
        
        sysarg_t address;
        int rc = async_req_2_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_GET_ADDRESS,
            dev_handle, &address);
        
        async_exchange_end(exch);
        async_hangup(parent_sess);
        
        if (rc != EOK)
                return rc;
        
        return (usb_address_t) address;
}


/** Get host controller handle by its class index.
 *
 * @param class_index Class index for the host controller.
 * @param hc_handle Where to store the HC handle
 *      (can be NULL for existence test only).
 * @return Error code.
 */
int usb_ddf_get_hc_handle_by_class(size_t class_index,
    devman_handle_t *hc_handle)
{
        char *class_index_str;
        devman_handle_t hc_handle_tmp;
        int rc;

        rc = asprintf(&class_index_str, "%zu", class_index);
        if (rc < 0) {
                return ENOMEM;
        }
        rc = devman_device_get_handle_by_class("usbhc", class_index_str,
            &hc_handle_tmp, 0);
        free(class_index_str);
        if (rc != EOK) {
                return rc;
        }

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

        return EOK;
}

/** 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)
{
        async_sess_t *parent_sess =
            devman_parent_device_connect(EXCHANGE_ATOMIC, device_handle,
            IPC_FLAG_BLOCKING);
        if (!parent_sess)
                return ENOMEM;
        
        async_exch_t *exch = async_exchange_begin(parent_sess);
        
        devman_handle_t h;
        int rc = async_req_1_1(exch, DEV_IFACE_ID(USB_DEV_IFACE),
            IPC_M_USB_GET_HOST_CONTROLLER_HANDLE, &h);
        
        async_exchange_end(exch);
        async_hangup(parent_sess);
        
        if (rc != EOK)
                return rc;
        
        if (hc_handle != NULL)
                *hc_handle = h;
        
        return EOK;
}

/**
 * @}
 */