source: mainline/uspace/drv/vhc/devices.c@ 4f380d06

/*
 * Copyright (c) 2010 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 usb
 * @{
 */
/** @file
 * @brief Virtual device management (implementation).
 */

#include <ipc/ipc.h>
#include <adt/list.h>
#include <bool.h>
#include <async.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <str_error.h>

#include <usbvirt/hub.h>

#include "devices.h"
#include "hub.h"
#include "hub/virthub.h"
#include "vhcd.h"

#define list_foreach(pos, head) \
        for (pos = (head)->next; pos != (head); \
                pos = pos->next)

static LIST_INITIALIZE(devices);

/** Create virtual device.
 *
 * @param address USB address.
 * @param phone Callback phone.
 * @return New device.
 * @retval NULL Out of memory or address already occupied.
 */
virtdev_connection_t *virtdev_add_device(int phone)
{
        virtdev_connection_t *dev = (virtdev_connection_t *)
            malloc(sizeof(virtdev_connection_t));
        dev->phone = phone;
        list_append(&dev->link, &devices);
        
        virthub_connect_device(&virtual_hub_device, dev);
        
        return dev;
}

/** Destroy virtual device.
 */
void virtdev_destroy_device(virtdev_connection_t *dev)
{
        virthub_disconnect_device(&virtual_hub_device, dev);
        list_remove(&dev->link);
        free(dev);
}

/** Send data to all connected devices.
 *
 * @param transaction Transaction to be sent over the bus.
 */
usb_transaction_outcome_t virtdev_send_to_all(transaction_t *transaction)
{
        /* For easier debugging. */
        switch (transaction->type) {
                case USBVIRT_TRANSACTION_SETUP:
                case USBVIRT_TRANSACTION_OUT:
                        transaction->actual_len = transaction->len;
                        break;
                case USBVIRT_TRANSACTION_IN:
                        transaction->actual_len = 0;
                        break;
                default:
                        assert(false && "unreachable branch in switch()");
        }
        usb_transaction_outcome_t outcome = USB_OUTCOME_BABBLE;

        link_t *pos;
        list_foreach(pos, &devices) {
                virtdev_connection_t *dev
                    = list_get_instance(pos, virtdev_connection_t, link);
                
                if (!virthub_is_device_enabled(&virtual_hub_device, dev)) {
                        continue;
                }
                
                ipc_call_t answer_data;
                sysarg_t answer_rc;
                aid_t req;
                int rc = EOK;
                int method = IPC_M_USBVIRT_TRANSACTION_SETUP;
                
                switch (transaction->type) {
                        case USBVIRT_TRANSACTION_SETUP:
                                method = IPC_M_USBVIRT_TRANSACTION_SETUP;
                                break;
                        case USBVIRT_TRANSACTION_IN:
                                method = IPC_M_USBVIRT_TRANSACTION_IN;
                                break;
                        case USBVIRT_TRANSACTION_OUT:
                                method = IPC_M_USBVIRT_TRANSACTION_OUT;
                                break;
                }
                
                req = async_send_3(dev->phone,
                    method,
                    transaction->target.address,
                    transaction->target.endpoint,
                    transaction->len,
                    &answer_data);
                
                if (transaction->len > 0) {
                        if (transaction->type == USBVIRT_TRANSACTION_IN) {
                                rc = async_data_read_start(dev->phone,
                                    transaction->buffer, transaction->len);
                        } else {
                                rc = async_data_write_start(dev->phone,
                                    transaction->buffer, transaction->len);
                        }
                }
                
                if (rc != EOK) {
                        async_wait_for(req, NULL);
                } else {
                        async_wait_for(req, &answer_rc);
                        transaction->actual_len = IPC_GET_ARG1(answer_data);
                        rc = (int)answer_rc;
                }

                /*
                 * If at least one device was able to accept this
                 * transaction and process it, we can announce success.
                 */
                if (rc == EOK) {
                        outcome = USB_OUTCOME_OK;
                }
        }
        
        /*
         * Send the data to the virtual hub as well
         * (if the address matches).
         */
        if (virtual_hub_device.address == transaction->target.address) {
                size_t tmp;
                dprintf(1, "sending `%s' transaction to hub",
                    usbvirt_str_transaction_type(transaction->type));
                switch (transaction->type) {
                        case USBVIRT_TRANSACTION_SETUP:
                                virtual_hub_device.transaction_setup(
                                    &virtual_hub_device,
                                    transaction->target.endpoint,
                                    transaction->buffer, transaction->len);
                                break;
                                
                        case USBVIRT_TRANSACTION_IN:
                                virtual_hub_device.transaction_in(
                                    &virtual_hub_device,
                                    transaction->target.endpoint,
                                    transaction->buffer, transaction->len,
                                    &tmp);
                                if (tmp < transaction->len) {
                                        transaction->len = tmp;
                                }
                                break;
                                
                        case USBVIRT_TRANSACTION_OUT:
                                virtual_hub_device.transaction_out(
                                    &virtual_hub_device,
                                    transaction->target.endpoint,
                                    transaction->buffer, transaction->len);
                                break;
                }
                dprintf(4, "transaction on hub processed...");
                outcome = USB_OUTCOME_OK;
        }
        
        /*
         * TODO: maybe screw some transactions to get more
         * real-life image.
         */
        return outcome;
}

/**
 * @}
 */