source: mainline/uspace/srv/hw/bus/usb/hcd/virtual/conndev.c@ b8a3cda

/*
 * 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 Connection handling of calls from virtual device (implementation).
 */

#include <assert.h>
#include <errno.h>
#include <usbvirt/hub.h>

#include "conn.h"
#include "hc.h"
#include "hub.h"

/** Handle data from device to host.
 */
static void handle_data_from_device(ipc_callid_t iid, ipc_call_t icall,
    virtdev_connection_t *dev)
{
        usb_target_t target = {
                .address = IPC_GET_ARG1(icall),
                .endpoint = IPC_GET_ARG2(icall)
        };
        size_t len = IPC_GET_ARG3(icall);
        
        if (!hub_can_device_signal(dev)) {
                ipc_answer_0(iid, EREFUSED);
                return;
        }
        
        dprintf("data from device %d [%d.%d]", dev->id,
            target.address, target.endpoint);
        
        int rc;
        
        void * buffer = NULL;
        if (len > 0) {
                rc = async_data_write_accept(&buffer, false,
                    1, USB_MAX_PAYLOAD_SIZE,
                    0, &len);
                
                if (rc != EOK) {
                        ipc_answer_0(iid, rc);
                        return;
                }
        }
        
        rc = hc_fillin_transaction_from_device(target, buffer, len);
        
        ipc_answer_0(iid, rc);
}

/** Connection handler for communcation with virtual device.
 *
 * @param phone_hash Incoming phone hash.
 * @param dev Virtual device handle.
 */
void connection_handler_device(ipcarg_t phone_hash, virtdev_connection_t *dev)
{
        assert(dev != NULL);
        
        dprintf("phone%#x: virtual device %d connected",
            phone_hash, dev->id);
        
        while (true) {
                ipc_callid_t callid; 
                ipc_call_t call; 
                
                callid = async_get_call(&call);
                
                switch (IPC_GET_METHOD(call)) {
                        case IPC_M_PHONE_HUNGUP:
                                ipc_hangup(dev->phone);
                                ipc_answer_0(callid, EOK);
                                dprintf("phone%#x: device %d hang-up",
                                    phone_hash, dev->id);
                                return;
                        
                        case IPC_M_CONNECT_TO_ME:
                                ipc_answer_0(callid, ELIMIT);
                                break;
                        
                        case IPC_M_USBVIRT_DATA_FROM_DEVICE:
                                handle_data_from_device(callid, call, dev);
                                break;
                        
                        default:
                                ipc_answer_0(callid, EINVAL);
                                break;
                }
        }
}

/**
 * @}
 */