source: mainline/uspace/drv/rootvirt/rootvirt.c@ ab3a851

/*
 * Copyright (c) 2010 Vojtech Horky
 * 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 rootvirt Root device driver for virtual devices.
 * @{
 */

/** @file
 */

#include <assert.h>
#include <stdio.h>
#include <errno.h>
#include <str_error.h>
#include <driver.h>

#define NAME "rootvirt"

/** Virtual device entry. */
typedef struct {
        /** Device name. */
        const char *name;
        /** Device match id. */
        const char *match_id;
} virtual_device_t;

/** List of existing virtual devices. */
virtual_device_t virtual_devices[] = {
#include "devices.def"
        /* Terminating item. */
        {
                .name = NULL,
                .match_id = NULL
        }
};

static int add_device(device_t *dev);

static driver_ops_t rootvirt_ops = {
        .add_device = &add_device
};

static driver_t rootvirt_driver = {
        .name = NAME,
        .driver_ops = &rootvirt_ops
};

/** Add child device.
 *
 * @param parent Parent device.
 * @param virt_dev Virtual device to add.
 * @return Error code.
 */
static int add_child(device_t *parent, virtual_device_t *virt_dev)
{
        printf(NAME ": registering child device `%s' (match \"%s\")\n",
            virt_dev->name, virt_dev->match_id);

        int rc = child_device_register_wrapper(parent, virt_dev->name,
            virt_dev->match_id, 10);

        if (rc == EOK) {
                printf(NAME ": registered child device `%s'\n",
                    virt_dev->name);
        } else {
                printf(NAME ": failed to register child device `%s': %s\n",
                    virt_dev->name, str_error(rc));
        }

        return rc;
}

static int add_device(device_t *dev)
{
        static int instances = 0;

        /*
         * Allow only single instance of root virtual device.
         */
        instances++;
        if (instances > 1) {
                return ELIMIT;
        }

        printf(NAME ": add_device(name=\"%s\", handle=%d)\n",
            dev->name, (int)dev->handle);
        
        /*
         * Go through all virtual devices and try to add them.
         * We silently ignore failures.
         */
        virtual_device_t *virt_dev = virtual_devices;
        while (virt_dev->name != NULL) {
                (void) add_child(dev, virt_dev);
                virt_dev++;
        }

        return EOK;
}

int main(int argc, char *argv[])
{
        printf(NAME ": HelenOS virtual devices root driver\n");
        return driver_main(&rootvirt_driver);
}

/**
 * @}
 */