source: mainline/uspace/srv/devman/main.c@ 729fa2d6

/*
 * 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.
 */

/**
 * @defgroup devman Device manager.
 * @brief HelenOS device manager.
 * @{
 */

/** @file
 */

#include <assert.h>
#include <ipc/services.h>
#include <ipc/ns.h>
#include <async.h>
#include <stdio.h>
#include <errno.h>
#include <bool.h>
#include <fibril_synch.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <ctype.h>
#include <ipc/devman.h>

#include "devman.h"

#define DRIVER_DEFAULT_STORE  "/srv/drivers"

static driver_list_t drivers_list;
static dev_tree_t device_tree;

/**
 * 
 * 
 * Driver's mutex must be locked.
 */
static void pass_devices_to_driver(driver_t *driver)
{
        

        
        
}

static void init_running_driver(driver_t *driver) 
{
        fibril_mutex_lock(&driver->driver_mutex);
        
        // pass devices which have been already assigned to the driver to the driver
        pass_devices_to_driver(driver); 
        
        // change driver's state to running
        driver->state = DRIVER_RUNNING; 
        
        fibril_mutex_unlock(&driver->driver_mutex);
}

/**
 * Register running driver.
 */
static driver_t * devman_driver_register(void)
{       
        printf(NAME ": devman_driver_register \n");
        
        ipc_call_t icall;
        ipc_callid_t iid = async_get_call(&icall);
        driver_t *driver = NULL;
        
        if (IPC_GET_METHOD(icall) != DEVMAN_DRIVER_REGISTER) {
                ipc_answer_0(iid, EREFUSED);
                return NULL;
        }
        
        char drv_name[DEVMAN_NAME_MAXLEN];
        
        // Get driver name
        int rc = async_string_receive(drv_name, DEVMAN_NAME_MAXLEN, NULL);      
        if (rc != EOK) {
                ipc_answer_0(iid, rc);
                return NULL;
        }
        printf(NAME ": the %s driver is trying to register by the service.\n", drv_name);
        
        // Find driver structure
        driver = find_driver(&drivers_list, drv_name);
        if (NULL == driver) {
                printf(NAME ": no driver named %s was found.\n", drv_name);
                ipc_answer_0(iid, ENOENT);
                return NULL;
        }
        printf(NAME ": registering the running instance of the %s driver.\n", driver->name);
        
        // Create connection to the driver
        printf(NAME ":  creating connection to the %s driver.\n", driver->name);        
        ipc_call_t call;
        ipc_callid_t callid = async_get_call(&call);            
        if (IPC_GET_METHOD(call) != IPC_M_CONNECT_TO_ME) {
                ipc_answer_0(callid, ENOTSUP);
                ipc_answer_0(iid, ENOTSUP);
                return NULL;
        }
        
        fibril_mutex_lock(&driver->driver_mutex);
        assert(DRIVER_STARTING == driver->state);
        driver->phone = IPC_GET_ARG5(call);     
        fibril_mutex_unlock(&driver->driver_mutex);     
        
        printf(NAME ":  the %s driver was successfully registered as running.\n", driver->name);
        
        ipc_answer_0(callid, EOK);      
        
        ipc_answer_0(iid, EOK);
        
        return driver;
}

/** Function for handling connections to device manager.
 *
 */
static void devman_connection_driver(ipc_callid_t iid, ipc_call_t *icall)
{       
        /* Accept the connection */
        ipc_answer_0(iid, EOK);
        
        driver_t *driver = devman_driver_register();
        if (driver == NULL)
                return;
                
        init_running_driver(driver);
        
        ipc_callid_t callid;
        ipc_call_t call;
        bool cont = true;
        while (cont) {
                callid = async_get_call(&call);
                
                switch (IPC_GET_METHOD(call)) {
                case IPC_M_PHONE_HUNGUP:
                        cont = false;
                        continue;
                case DEVMAN_ADD_CHILD_DEVICE:
                        // TODO add new device node to the device tree
                        break;
                default:
                        ipc_answer_0(callid, EINVAL); 
                        break;
                }
        }
}

/** Function for handling connections to device manager.
 *
 */
static void devman_connection(ipc_callid_t iid, ipc_call_t *icall)
{
        // Select interface 
        switch ((ipcarg_t) (IPC_GET_ARG1(*icall))) {
        case DEVMAN_DRIVER:
                devman_connection_driver(iid, icall);
                break;
        /*case DEVMAN_CLIENT:
                devmap_connection_client(iid, icall);
                break;
        case DEVMAN_CONNECT_TO_DEVICE:
                // Connect client to selected device
                devmap_forward(iid, icall);
                break;*/
        default:
                /* No such interface */
                ipc_answer_0(iid, ENOENT);
        }
}

/** Initialize device manager internal structures.
 */
static bool devman_init()
{
        printf(NAME ": devman_init - looking for available drivers. \n");       
        
        // initialize list of available drivers
        init_driver_list(&drivers_list);
        if (0 == lookup_available_drivers(&drivers_list, DRIVER_DEFAULT_STORE)) {
                printf(NAME " no drivers found.");
                return false;
        }
        printf(NAME ": devman_init  - list of drivers has been initialized. \n");

        // create root device node 
        if (!init_device_tree(&device_tree, &drivers_list)) {
                printf(NAME " failed to initialize device tree.");
                return false;           
        }

        return true;
}

int main(int argc, char *argv[])
{
        printf(NAME ": HelenOS Device Manager\n");

        if (!devman_init()) {
                printf(NAME ": Error while initializing service\n");
                return -1;
        }
        
        // Set a handler of incomming connections
        async_set_client_connection(devman_connection);

        // Register device manager at naming service
        ipcarg_t phonead;
        if (ipc_connect_to_me(PHONE_NS, SERVICE_DEVMAN, 0, 0, &phonead) != 0)
                return -1;

        printf(NAME ": Accepting connections\n");
        async_manager();

        // Never reached
        return 0;
}