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4401 svoboda 1 
/*
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 * Copyright (c) 2007 Josef Cejka
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 * Copyright (c) 2009 Jiri Svoboda
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <string.h>
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#include <ipc/ipc.h>
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#include <ipc/services.h>
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#include <ipc/devmap.h>
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#include <devmap.h>
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#include <async.h>
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#include <errno.h>
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static int devmap_phone = -1;
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/** Get phone to device mapper task. */
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static int devmap_get_phone(unsigned int flags)
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{
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    int phone;
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    if (devmap_phone >= 0)
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        return devmap_phone;
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    if (flags & IPC_FLAG_BLOCKING) {
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        phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAP,
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            DEVMAP_CLIENT, 0);
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    } else {
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        phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP,
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            DEVMAP_CLIENT, 0);
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    }
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    if (phone < 0)
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        return phone;
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    devmap_phone = phone;
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    return phone;
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}
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/** Register new driver with devmap. */
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int devmap_driver_register(const char *name, async_client_conn_t conn)
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{
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    ipcarg_t retval;
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    aid_t req;
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    ipc_call_t answer;
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    int phone;
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    ipcarg_t callback_phonehash;
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    phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAP,
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        DEVMAP_DRIVER, 0);
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    if (phone < 0) {
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        return phone;
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    }
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    req = async_send_2(phone, DEVMAP_DRIVER_REGISTER, 0, 0, &answer);
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    retval = ipc_data_write_start(phone, name, str_size(name) + 1);
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    if (retval != EOK) {
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        async_wait_for(req, NULL);
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        ipc_hangup(phone);
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        return -1;
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    }
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    async_set_client_connection(conn);
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    ipc_connect_to_me(phone, 0, 0, 0, &callback_phonehash);
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    async_wait_for(req, &retval);
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    return phone;
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}
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int devmap_device_get_handle(const char *name, dev_handle_t *handle,
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    unsigned int flags)
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{
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    ipcarg_t retval;
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    aid_t req;
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    ipc_call_t answer;
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    int phone;
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    phone = devmap_get_phone(flags);
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    if (phone < 0)
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        return phone;
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    req = async_send_2(phone, DEVMAP_DEVICE_GET_HANDLE, flags, 0,
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        &answer);
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    retval = ipc_data_write_start(phone, name, str_size(name) + 1);
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    if (retval != EOK) {
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        async_wait_for(req, NULL);
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        return retval;
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    }
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    async_wait_for(req, &retval);
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    if (retval != EOK) {
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        if (handle != NULL)
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            *handle = -1;
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        return retval;
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    }
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    if (handle != NULL)
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        *handle = (int) IPC_GET_ARG1(answer);
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    return retval;
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}
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int devmap_device_connect(dev_handle_t handle, unsigned int flags)
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{
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    int phone;
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    if (flags & IPC_FLAG_BLOCKING) {
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        phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAP,
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            DEVMAP_CONNECT_TO_DEVICE, handle);
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    } else {
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        phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP,
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            DEVMAP_CONNECT_TO_DEVICE, handle);
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    }
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    return phone;
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}
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/** Register new device.
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 *
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 * @param driver_phone
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 * @param name Device name.
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 * @param handle Output: Handle to the created instance of device.
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 */
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int devmap_device_register(int driver_phone, const char *name, int *handle)
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{
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    ipcarg_t retval;
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    aid_t req;
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    ipc_call_t answer;
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    req = async_send_2(driver_phone, DEVMAP_DEVICE_REGISTER, 0, 0,
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        &answer);
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    retval = ipc_data_write_start(driver_phone, name, str_size(name) + 1);
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    if (retval != EOK) {
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        async_wait_for(req, NULL);
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        return retval;
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    }
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    async_wait_for(req, &retval);
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    if (retval != EOK) {
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        if (handle != NULL)
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            *handle = -1;
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        return retval;
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    }
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    *handle = (int) IPC_GET_ARG1(answer);
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    return retval;
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}