devman.c

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/*
 * Copyright (c) 2007 Josef Cejka
 * Copyright (c) 2009 Jiri Svoboda
 * Copyright (c) 2010 Lenka Trochtova
 * 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 <str.h>
#include <stdio.h>
#include <ipc/services.h>
#include <ipc/devman.h>
#include <devman.h>
#include <async.h>
#include <fibril_synch.h>
#include <errno.h>
#include <malloc.h>
#include <bool.h>
#include <adt/list.h>

static int devman_phone_driver = -1;
static int devman_phone_client = -1;

static FIBRIL_MUTEX_INITIALIZE(devman_phone_mutex);

int devman_get_phone(devman_interface_t iface, unsigned int flags)
{
        switch (iface) {
        case DEVMAN_DRIVER:
                fibril_mutex_lock(&devman_phone_mutex);
                if (devman_phone_driver >= 0) {
                        fibril_mutex_unlock(&devman_phone_mutex);
                        return devman_phone_driver;
                }
                
                if (flags & IPC_FLAG_BLOCKING)
                        devman_phone_driver = async_connect_me_to_blocking(
                            PHONE_NS, SERVICE_DEVMAN, DEVMAN_DRIVER, 0);
                else
                        devman_phone_driver = async_connect_me_to(PHONE_NS,
                            SERVICE_DEVMAN, DEVMAN_DRIVER, 0);
                
                fibril_mutex_unlock(&devman_phone_mutex);
                return devman_phone_driver;
        case DEVMAN_CLIENT:
                fibril_mutex_lock(&devman_phone_mutex);
                if (devman_phone_client >= 0) {
                        fibril_mutex_unlock(&devman_phone_mutex);
                        return devman_phone_client;
                }
                
                if (flags & IPC_FLAG_BLOCKING) {
                        devman_phone_client = async_connect_me_to_blocking(
                            PHONE_NS, SERVICE_DEVMAN, DEVMAN_CLIENT, 0);
                } else {
                        devman_phone_client = async_connect_me_to(PHONE_NS,
                            SERVICE_DEVMAN, DEVMAN_CLIENT, 0);
                }
                
                fibril_mutex_unlock(&devman_phone_mutex);
                return devman_phone_client;
        default:
                return -1;
        }
}

int devman_driver_register(const char *name, async_client_conn_t conn)
{
        int phone = devman_get_phone(DEVMAN_DRIVER, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return phone;
        
        async_serialize_start();
        
        ipc_call_t answer;
        aid_t req = async_send_2(phone, DEVMAN_DRIVER_REGISTER, 0, 0, &answer);
        
        sysarg_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);
        
        async_connect_to_me(phone, 0, 0, 0, NULL);
        async_wait_for(req, &retval);
        
        async_serialize_end();
        
        return retval;
}

static int devman_send_match_id(int phone, match_id_t *match_id)
{
        ipc_call_t answer;

        aid_t req = async_send_1(phone, DEVMAN_ADD_MATCH_ID, match_id->score,
            &answer);
        int retval = async_data_write_start(phone, match_id->id,
            str_size(match_id->id));

        async_wait_for(req, NULL);
        return retval;
}


static int devman_send_match_ids(int phone, match_id_list_t *match_ids)
{
        link_t *link = match_ids->ids.next;
        match_id_t *match_id = NULL;
        int ret = EOK;

        while (link != &match_ids->ids) {
                match_id = list_get_instance(link, match_id_t, link); 
                ret = devman_send_match_id(phone, match_id);
                if (ret != EOK) {
                        return ret;
                }

                link = link->next;
        }

        return ret;
}

int devman_add_function(const char *name, fun_type_t ftype,
    match_id_list_t *match_ids, devman_handle_t devh, devman_handle_t *funh)
{
        int phone = devman_get_phone(DEVMAN_DRIVER, IPC_FLAG_BLOCKING);
        int fun_handle;
        
        if (phone < 0)
                return phone;
        
        async_serialize_start();
        
        int match_count = list_count(&match_ids->ids);
        ipc_call_t answer;

        aid_t req = async_send_3(phone, DEVMAN_ADD_FUNCTION, (sysarg_t) ftype,
            devh, match_count, &answer);

        sysarg_t retval = async_data_write_start(phone, name, str_size(name));
        if (retval != EOK) {
                async_wait_for(req, NULL);
                async_serialize_end();
                return retval;
        }
        
        int match_ids_rc = devman_send_match_ids(phone, match_ids);
        
        async_wait_for(req, &retval);
        
        async_serialize_end();
        
        /* Prefer the answer to DEVMAN_ADD_FUNCTION in case of errors. */
        if ((match_ids_rc != EOK) && (retval == EOK)) {
                retval = match_ids_rc;
        }

        if (retval == EOK)
                fun_handle = (int) IPC_GET_ARG1(answer);
        else
                fun_handle = -1;
        
        *funh = fun_handle;

        return retval;
}

int devman_add_device_to_class(devman_handle_t devman_handle,
    const char *class_name)
{
        int phone = devman_get_phone(DEVMAN_DRIVER, IPC_FLAG_BLOCKING);
        
        if (phone < 0)
                return phone;
        
        async_serialize_start();
        ipc_call_t answer;
        aid_t req = async_send_1(phone, DEVMAN_ADD_DEVICE_TO_CLASS,
            devman_handle, &answer);
        
        sysarg_t retval = async_data_write_start(phone, class_name,
            str_size(class_name));
        if (retval != EOK) {
                async_wait_for(req, NULL);
                async_serialize_end();
                return retval;
        }
        
        async_wait_for(req, &retval);
        async_serialize_end();
        
        return retval;
}

void devman_hangup_phone(devman_interface_t iface)
{
        switch (iface) {
        case DEVMAN_DRIVER:
                if (devman_phone_driver >= 0) {
                        async_hangup(devman_phone_driver);
                        devman_phone_driver = -1;
                }
                break;
        case DEVMAN_CLIENT:
                if (devman_phone_client >= 0) {
                        async_hangup(devman_phone_client);
                        devman_phone_client = -1;
                }
                break;
        default:
                break;
        }
}

int devman_device_connect(devman_handle_t handle, unsigned int flags)
{
        int phone;
        
        if (flags & IPC_FLAG_BLOCKING) {
                phone = async_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAN,
                    DEVMAN_CONNECT_TO_DEVICE, handle);
        } else {
                phone = async_connect_me_to(PHONE_NS, SERVICE_DEVMAN,
                    DEVMAN_CONNECT_TO_DEVICE, handle);
        }
        
        return phone;
}

int devman_parent_device_connect(devman_handle_t handle, unsigned int flags)
{
        int phone;
        
        if (flags & IPC_FLAG_BLOCKING) {
                phone = async_connect_me_to_blocking(PHONE_NS, SERVICE_DEVMAN,
                    DEVMAN_CONNECT_TO_PARENTS_DEVICE, handle);
        } else {
                phone = async_connect_me_to(PHONE_NS, SERVICE_DEVMAN,
                    DEVMAN_CONNECT_TO_PARENTS_DEVICE, handle);
        }
        
        return phone;
}

int devman_device_get_handle(const char *pathname, devman_handle_t *handle,
    unsigned int flags)
{
        int phone = devman_get_phone(DEVMAN_CLIENT, flags);
        
        if (phone < 0)
                return phone;
        
        async_serialize_start();
        
        ipc_call_t answer;
        aid_t req = async_send_2(phone, DEVMAN_DEVICE_GET_HANDLE, flags, 0,
            &answer);
        
        sysarg_t retval = async_data_write_start(phone, pathname,
            str_size(pathname));
        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 = (devman_handle_t) -1;
                return retval;
        }
        
        if (handle != NULL)
                *handle = (devman_handle_t) IPC_GET_ARG1(answer);
        
        return retval;
}

int devman_device_get_handle_by_class(const char *classname,
    const char *devname, devman_handle_t *handle, unsigned int flags)
{
        int phone = devman_get_phone(DEVMAN_CLIENT, flags);

        if (phone < 0)
                return phone;

        async_serialize_start();

        ipc_call_t answer;
        aid_t req = async_send_1(phone, DEVMAN_DEVICE_GET_HANDLE_BY_CLASS,
            flags, &answer);

        sysarg_t retval = async_data_write_start(phone, classname,
            str_size(classname));
        if (retval != EOK) {
                async_wait_for(req, NULL);
                async_serialize_end();
                return retval;
        }
        retval = async_data_write_start(phone, devname,
            str_size(devname));
        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 = (devman_handle_t) -1;
                return retval;
        }

        if (handle != NULL)
                *handle = (devman_handle_t) IPC_GET_ARG1(answer);

        return retval;
}

int devman_get_device_path(devman_handle_t handle, char *path, size_t path_size)
{
        int phone = devman_get_phone(DEVMAN_CLIENT, 0);

        if (phone < 0)
                return phone;

        async_serialize_start();

        ipc_call_t answer;
        aid_t req = async_send_1(phone, DEVMAN_DEVICE_GET_DEVICE_PATH,
            handle, &answer);

        ipc_call_t data_request_call;
        aid_t data_request = async_data_read(phone, path, path_size,
            &data_request_call);
        if (data_request == 0) {
                async_wait_for(req, NULL);
                async_serialize_end();
                return ENOMEM;
        }

        sysarg_t data_request_rc;
        sysarg_t opening_request_rc;
        async_wait_for(data_request, &data_request_rc);
        async_wait_for(req, &opening_request_rc);

        async_serialize_end();

        if (data_request_rc != EOK) {
                /* Prefer the return code of the opening request. */
                if (opening_request_rc != EOK) {
                        return (int) opening_request_rc;
                } else {
                        return (int) data_request_rc;
                }
        }
        if (opening_request_rc != EOK) {
                return (int) opening_request_rc;
        }

        /* To be on the safe-side. */
        path[path_size - 1] = 0;

        size_t transferred_size = IPC_GET_ARG2(data_request_call);

        if (transferred_size >= path_size) {
                return ELIMIT;
        }

        /* Terminate the string (trailing 0 not send over IPC). */
        path[transferred_size] = 0;

        return EOK;
}

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