source: mainline/uspace/lib/libc/generic/devmap.c@ 21f32ee1

/*
 * 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>
#include <malloc.h>
#include <bool.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;
        
        async_serialize_start();
        
        ipc_call_t answer;
        aid_t req = async_send_2(phone, DEVMAP_DRIVER_REGISTER, 0, 0, &answer);
        
        ipcarg_t retval = async_data_write_start(phone, name, str_size(name));
        if (retval != EOK) {
                async_wait_for(req, NULL);
                async_serialize_end();
                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);
        
        async_serialize_end();
        
        return retval;
}

/** Register new device.
 *
 * @param namespace Namespace name.
 * @param fqdn      Fully qualified device name.
 * @param handle    Output: Handle to the created instance of device.
 *
 */
int devmap_device_register(const char *fqdn, dev_handle_t *handle)
{
        int phone = devmap_get_phone(DEVMAP_DRIVER, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return phone;
        
        async_serialize_start();
        
        ipc_call_t answer;
        aid_t req = async_send_2(phone, DEVMAP_DEVICE_REGISTER, 0, 0,
            &answer);
        
        ipcarg_t retval = async_data_write_start(phone, fqdn, str_size(fqdn));
        if (retval != EOK) {
                async_wait_for(req, NULL);
                async_serialize_end();
                return retval;
        }
        
        async_wait_for(req, &retval);
        
        async_serialize_end();
        
        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 *fqdn, dev_handle_t *handle, unsigned int flags)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, flags);
        
        if (phone < 0)
                return phone;
        
        async_serialize_start();
        
        ipc_call_t answer;
        aid_t req = async_send_2(phone, DEVMAP_DEVICE_GET_HANDLE, flags, 0,
            &answer);
        
        ipcarg_t retval = async_data_write_start(phone, fqdn, str_size(fqdn));
        if (retval != EOK) {
                async_wait_for(req, NULL);
                async_serialize_end();
                return retval;
        }
        
        async_wait_for(req, &retval);
        
        async_serialize_end();
        
        if (retval != EOK) {
                if (handle != NULL)
                        *handle = (dev_handle_t) -1;
                return retval;
        }
        
        if (handle != NULL)
                *handle = (dev_handle_t) IPC_GET_ARG1(answer);
        
        return retval;
}

int devmap_namespace_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;
        
        async_serialize_start();
        
        ipc_call_t answer;
        aid_t req = async_send_2(phone, DEVMAP_NAMESPACE_GET_HANDLE, flags, 0,
            &answer);
        
        ipcarg_t retval = async_data_write_start(phone, name, str_size(name));
        if (retval != EOK) {
                async_wait_for(req, NULL);
                async_serialize_end();
                return retval;
        }
        
        async_wait_for(req, &retval);
        
        async_serialize_end();
        
        if (retval != EOK) {
                if (handle != NULL)
                        *handle = (dev_handle_t) -1;
                return retval;
        }
        
        if (handle != NULL)
                *handle = (dev_handle_t) IPC_GET_ARG1(answer);
        
        return retval;
}

devmap_handle_type_t devmap_handle_probe(dev_handle_t handle)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return phone;
        
        ipcarg_t type;
        int retval = async_req_1_1(phone, DEVMAP_HANDLE_PROBE, handle, &type);
        if (retval != EOK)
                return DEV_HANDLE_NONE;
        
        return (devmap_handle_type_t) type;
}

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;
}

int devmap_null_create(void)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return -1;
        
        ipcarg_t null_id;
        int retval = async_req_0_1(phone, DEVMAP_NULL_CREATE, &null_id);
        if (retval != EOK)
                return -1;
        
        return (int) null_id;
}

void devmap_null_destroy(int null_id)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return;
        
        async_req_1_0(phone, DEVMAP_NULL_DESTROY, (ipcarg_t) null_id);
}

static size_t devmap_count_namespaces_internal(int phone)
{
        ipcarg_t count;
        int retval = async_req_0_1(phone, DEVMAP_GET_NAMESPACE_COUNT, &count);
        if (retval != EOK)
                return 0;
        
        return count;
}

static size_t devmap_count_devices_internal(int phone, dev_handle_t ns_handle)
{
        ipcarg_t count;
        int retval = async_req_1_1(phone, DEVMAP_GET_DEVICE_COUNT, ns_handle, &count);
        if (retval != EOK)
                return 0;
        
        return count;
}

size_t devmap_count_namespaces(void)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return 0;
        
        return devmap_count_namespaces_internal(phone);
}

size_t devmap_count_devices(dev_handle_t ns_handle)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return 0;
        
        return devmap_count_devices_internal(phone, ns_handle);
}

size_t devmap_get_namespaces(dev_desc_t **data)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return 0;
        
        /* Loop until namespaces read succesful */
        while (true) {
                size_t count = devmap_count_namespaces_internal(phone);
                if (count == 0)
                        return 0;
                
                dev_desc_t *devs = (dev_desc_t *) calloc(count, sizeof(dev_desc_t));
                if (devs == NULL)
                        return 0;
                
                async_serialize_start();
                
                ipc_call_t answer;
                aid_t req = async_send_0(phone, DEVMAP_GET_NAMESPACES, &answer);
                
                int rc = async_data_read_start(phone, devs, count * sizeof(dev_desc_t));
                if (rc == EOVERFLOW) {
                        /*
                         * Number of namespaces has changed since
                         * the last call of DEVMAP_DEVICE_GET_NAMESPACE_COUNT
                         */
                        async_serialize_end();
                        free(devs);
                        continue;
                }
                
                if (rc != EOK) {
                        async_wait_for(req, NULL);
                        async_serialize_end();
                        free(devs);
                        return 0;
                }
                
                ipcarg_t retval;
                async_wait_for(req, &retval);
                async_serialize_end();
                
                if (retval != EOK)
                        return 0;
                
                *data = devs;
                return count;
        }
}

size_t devmap_get_devices(dev_handle_t ns_handle, dev_desc_t **data)
{
        int phone = devmap_get_phone(DEVMAP_CLIENT, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return 0;
        
        /* Loop until namespaces read succesful */
        while (true) {
                size_t count = devmap_count_devices_internal(phone, ns_handle);
                if (count == 0)
                        return 0;
                
                dev_desc_t *devs = (dev_desc_t *) calloc(count, sizeof(dev_desc_t));
                if (devs == NULL)
                        return 0;
                
                async_serialize_start();
                
                ipc_call_t answer;
                aid_t req = async_send_1(phone, DEVMAP_GET_DEVICES, ns_handle, &answer);
                
                int rc = async_data_read_start(phone, devs, count * sizeof(dev_desc_t));
                if (rc == EOVERFLOW) {
                        /*
                         * Number of devices has changed since
                         * the last call of DEVMAP_DEVICE_GET_DEVICE_COUNT
                         */
                        async_serialize_end();
                        free(devs);
                        continue;
                }
                
                if (rc != EOK) {
                        async_wait_for(req, NULL);
                        async_serialize_end();
                        free(devs);
                        return 0;
                }
                
                ipcarg_t retval;
                async_wait_for(req, &retval);
                async_serialize_end();
                
                if (retval != EOK)
                        return 0;
                
                *data = devs;
                return count;
        }
}