source: mainline/uspace/drv/vhc/conndev.c@ bc1c6fb

/*
 * 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 drvusbvhc
 * @{
 */
/** @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"

#define DEVICE_NAME_MAXLENGTH 32

static int get_device_name(int phone, char *buffer, size_t len)
{
        ipc_call_t answer_data;
        sysarg_t answer_rc;
        aid_t req;
        int rc;
        
        req = async_send_0(phone,
            IPC_M_USBVIRT_GET_NAME,
            &answer_data);
        
        rc = async_data_read_start(phone, buffer, len);
        if (rc != EOK) {
                async_wait_for(req, NULL);
                return EINVAL;
        }
        
        async_wait_for(req, &answer_rc);
        rc = (int)answer_rc;
        
        if (IPC_GET_ARG1(answer_data) < len) {
                len = IPC_GET_ARG1(answer_data);
        } else {
                len--;
        }
        buffer[len] = 0;
        
        return rc;
}

/** Default handler for IPC methods not handled by DDF.
 *
 * @param fun Device handling the call.
 * @param icallid Call id.
 * @param icall Call data.
 */
void default_connection_handler(ddf_fun_t *fun,
    ipc_callid_t icallid, ipc_call_t *icall)
{
        sysarg_t method = IPC_GET_IMETHOD(*icall);

        if (method == IPC_M_CONNECT_TO_ME) {
                int callback = IPC_GET_ARG5(*icall);
                virtdev_connection_t *dev
                    = virtdev_add_device(callback, (sysarg_t)fibril_get_id());
                if (!dev) {
                        async_answer_0(icallid, EEXISTS);
                        async_hangup(callback);
                        return;
                }
                async_answer_0(icallid, EOK);

                char devname[DEVICE_NAME_MAXLENGTH + 1];
                int rc = get_device_name(callback, devname, DEVICE_NAME_MAXLENGTH);

                usb_log_info("New virtual device `%s' (id = %x).\n",
                    rc == EOK ? devname : "<unknown>", dev->id);

                return;
        }

        async_answer_0(icallid, EINVAL);
}

/** Callback for DDF when client disconnects.
 *
 * @param fun Device function the client was connected to.
 */
void on_client_close(ddf_fun_t *fun)
{
        /*
         * Maybe a virtual device is being unplugged.
         */
        virtdev_connection_t *dev = virtdev_find((sysarg_t)fibril_get_id());
        if (dev == NULL) {
                return;
        }

        usb_log_info("Virtual device disconnected (id = %x).\n", dev->id);
        virtdev_destroy_device(dev);
}


/**
 * @}
 */