source: mainline/uspace/lib/libc/generic/devmap.c@ b267ee6

/*
 * Copyright (c) 2007 Josef Cejka
 * Copyright (c) 2009 Jiri Svoboda
 * 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.
 */

#include <string.h>
#include <ipc/ipc.h>
#include <ipc/services.h>
#include <ipc/devmap.h>
#include <devmap.h>
#include <async.h>
#include <errno.h>

static int devmap_phone_driver = -1;
static int devmap_phone_client = -1;

/** Get phone to device mapper task. */
int devmap_get_phone(devmap_interface_t iface, unsigned int flags)
{
        switch (iface) {
        case DEVMAP_DRIVER:
                if (devmap_phone_driver >= 0)
                        return devmap_phone_driver;
                
                if (flags & IPC_FLAG_BLOCKING)
                        devmap_phone_driver = ipc_connect_me_to_blocking(PHONE_NS,
                            SERVICE_DEVMAP, DEVMAP_DRIVER, 0);
                else
                        devmap_phone_driver = ipc_connect_me_to(PHONE_NS,
                            SERVICE_DEVMAP, DEVMAP_DRIVER, 0);
                
                return devmap_phone_driver;
        case DEVMAP_CLIENT:
                if (devmap_phone_client >= 0)
                        return devmap_phone_client;
                
                if (flags & IPC_FLAG_BLOCKING)
                        devmap_phone_client = ipc_connect_me_to_blocking(PHONE_NS,
                            SERVICE_DEVMAP, DEVMAP_CLIENT, 0);
                else
                        devmap_phone_client = ipc_connect_me_to(PHONE_NS,
                            SERVICE_DEVMAP, DEVMAP_CLIENT, 0);
                
                return devmap_phone_client;
        default:
                return -1;
        }
}

void devmap_hangup_phone(devmap_interface_t iface)
{
        switch (iface) {
        case DEVMAP_DRIVER:
                if (devmap_phone_driver >= 0) {
                        ipc_hangup(devmap_phone_driver);
                        devmap_phone_driver = -1;
                }
                break;
        case DEVMAP_CLIENT:
                if (devmap_phone_client >= 0) {
                        ipc_hangup(devmap_phone_client);
                        devmap_phone_client = -1;
                }
                break;
        default:
                break;
        }
}

/** Register new driver with devmap. */
int devmap_driver_register(const char *name, async_client_conn_t conn)
{
        int phone = devmap_get_phone(DEVMAP_DRIVER, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return phone;
        
        ipc_call_t answer;
        aid_t req = async_send_2(phone, DEVMAP_DRIVER_REGISTER, 0, 0, &answer);
        
        ipcarg_t retval = ipc_data_write_start(phone, name, str_size(name) + 1);
        
        if (retval != EOK) {
                async_wait_for(req, NULL);
                return -1;
        }
        
        async_set_client_connection(conn);
        
        ipcarg_t callback_phonehash;
        ipc_connect_to_me(phone, 0, 0, 0, &callback_phonehash);
        async_wait_for(req, &retval);
        
        return retval;
}

/** Register new device.
 *
 * @param name   Device name.
 * @param handle Output: Handle to the created instance of device.
 *
 */
int devmap_device_register(const char *name, dev_handle_t *handle)
{
        int phone = devmap_get_phone(DEVMAP_DRIVER, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return phone;
        
        ipc_call_t answer;
        aid_t req = async_send_2(phone, DEVMAP_DEVICE_REGISTER, 0, 0,
            &answer);
        
        ipcarg_t retval = ipc_data_write_start(phone, name, str_size(name) + 1);
        
        if (retval != EOK) {
                async_wait_for(req, NULL);
                return retval;
        }
        
        async_wait_for(req, &retval);
        
        if (retval != EOK) {
                if (handle != NULL)
                        *handle = -1;
                return retval;
        }
        
        if (handle != NULL)
                *handle = (dev_handle_t) IPC_GET_ARG1(answer);
        
        return retval;
}

int devmap_device_get_handle(const char *name, dev_handle_t *handle, unsigned int flags)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, flags);
        
        if (phone < 0)
                return phone;
        
        ipc_call_t answer;
        aid_t req = async_send_2(phone, DEVMAP_DEVICE_GET_HANDLE, flags, 0,
            &answer);
        
        ipcarg_t retval = ipc_data_write_start(phone, name, str_size(name) + 1);
        
        if (retval != EOK) {
                async_wait_for(req, NULL);
                return retval;
        }
        
        async_wait_for(req, &retval);
        
        if (retval != EOK) {
                if (handle != NULL)
                        *handle = -1;
                return retval;
        }
        
        if (handle != NULL)
                *handle = (dev_handle_t) IPC_GET_ARG1(answer);
        
        return retval;
}

int devmap_device_connect(dev_handle_t handle, unsigned int flags)
{
        int phone;
        
        if (flags & IPC_FLAG_BLOCKING) {
                phone = ipc_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAP,
                    DEVMAP_CONNECT_TO_DEVICE, handle);
        } else {
                phone = ipc_connect_me_to(PHONE_NS, SERVICE_DEVMAP,
                    DEVMAP_CONNECT_TO_DEVICE, handle);
        }
        
        return phone;
}

ipcarg_t devmap_device_get_count(void)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return 0;
        
        ipcarg_t count;
        int retval = ipc_call_sync_0_1(phone, DEVMAP_DEVICE_GET_COUNT, &count);
        if (retval != EOK)
                return 0;
        
        return count;
}

ipcarg_t devmap_device_get_devices(ipcarg_t count, dev_desc_t *data)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return 0;
        
        ipc_call_t answer;
        aid_t req = async_send_0(phone, DEVMAP_DEVICE_GET_DEVICES, &answer);
        
        ipcarg_t retval = ipc_data_read_start(phone, data, count * sizeof(dev_desc_t));
        
        if (retval != EOK) {
                async_wait_for(req, NULL);
                return 0;
        }
        
        async_wait_for(req, &retval);
        
        if (retval != EOK)
                return 0;
        
        return IPC_GET_ARG1(answer);
}