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/*

 * RapidIO driver support

 *

 * Copyright 2005 MontaVista Software, Inc.

 * Matt Porter <mporter@kernel.crashing.org>

 *

 * This program is free software; you can redistribute  it and/or modify it

 * under  the terms of  the GNU General  Public License as published by the

 * Free Software Foundation;  either version 2 of the  License, or (at your

 * option) any later version.

 */

#include <linux/init.h>

#include <linux/module.h>

#include <linux/rio.h>

#include <linux/rio_ids.h>

#include "rio.h"

/**

 *  rio_match_device - Tell if a RIO device has a matching RIO device id structure

 *  @id: the RIO device id structure to match against

 *  @rdev: the RIO device structure to match against

 *

 *  Used from driver probe and bus matching to check whether a RIO device

 *  matches a device id structure provided by a RIO driver. Returns the

 *  matching &struct rio_device_id or %NULL if there is no match.

 */

static const struct rio_device_id *rio_match_device(const struct rio_device_id

                                                    *id,

                                                    const struct rio_dev *rdev)

{

        while (id->vid || id->asm_vid) {

                if (((id->vid == RIO_ANY_ID) || (id->vid == rdev->vid)) &&

                    ((id->did == RIO_ANY_ID) || (id->did == rdev->did)) &&

                    ((id->asm_vid == RIO_ANY_ID)

                     || (id->asm_vid == rdev->asm_vid))

                    && ((id->asm_did == RIO_ANY_ID)

                        || (id->asm_did == rdev->asm_did)))

                        return id;

                id++;

        }

        return NULL;

}

/**

 * rio_dev_get - Increments the reference count of the RIO device structure

 *

 * @rdev: RIO device being referenced

 *

 * Each live reference to a device should be refcounted.

 *

 * Drivers for RIO devices should normally record such references in

 * their probe() methods, when they bind to a device, and release

 * them by calling rio_dev_put(), in their disconnect() methods.

 */

struct rio_dev *rio_dev_get(struct rio_dev *rdev)

{

        if (rdev)

                get_device(&rdev->dev);

        return rdev;

}

/**

 * rio_dev_put - Release a use of the RIO device structure

 *

 * @rdev: RIO device being disconnected

 *

 * Must be called when a user of a device is finished with it.

 * When the last user of the device calls this function, the

 * memory of the device is freed.

 */

void rio_dev_put(struct rio_dev *rdev)

{

        if (rdev)

                put_device(&rdev->dev);

}

/**

 *  rio_device_probe - Tell if a RIO device structure has a matching RIO

 *                     device id structure

 *  @id: the RIO device id structure to match against

 *  @dev: the RIO device structure to match against

 *

 * return 0 and set rio_dev->driver when drv claims rio_dev, else error

 */

static int rio_device_probe(struct device *dev)

{

        struct rio_driver *rdrv = to_rio_driver(dev->driver);

        struct rio_dev *rdev = to_rio_dev(dev);

        int error = -ENODEV;

        const struct rio_device_id *id;

        if (!rdev->driver && rdrv->probe) {

                if (!rdrv->id_table)

                        return error;

                id = rio_match_device(rdrv->id_table, rdev);

                rio_dev_get(rdev);

                if (id)

                        error = rdrv->probe(rdev, id);

                if (error >= 0) {

                        rdev->driver = rdrv;

                        error = 0;

                        rio_dev_put(rdev);

                }

        }

        return error;

}

/**

 *  rio_device_remove - Remove a RIO device from the system

 *

 *  @dev: the RIO device structure to match against

 *

 * Remove a RIO device from the system. If it has an associated

 * driver, then run the driver remove() method.  Then update

 * the reference count.

 */

static int rio_device_remove(struct device *dev)

{

        struct rio_dev *rdev = to_rio_dev(dev);

        struct rio_driver *rdrv = rdev->driver;

        if (rdrv) {

                if (rdrv->remove)

                        rdrv->remove(rdev);

                rdev->driver = NULL;

        }

        rio_dev_put(rdev);

        return 0;

}

/**

 *  rio_register_driver - register a new RIO driver

 *  @rdrv: the RIO driver structure to register

 *

 *  Adds a &struct rio_driver to the list of registered drivers

 *  Returns a negative value on error, otherwise 0. If no error

 *  occurred, the driver remains registered even if no device

 *  was claimed during registration.

 */

int rio_register_driver(struct rio_driver *rdrv)

{

        /* initialize common driver fields */

        rdrv->driver.name = rdrv->name;

        rdrv->driver.bus = &rio_bus_type;

        /* register with core */

        return driver_register(&rdrv->driver);

}

/**

 *  rio_unregister_driver - unregister a RIO driver

 *  @rdrv: the RIO driver structure to unregister

 *

 *  Deletes the &struct rio_driver from the list of registered RIO

 *  drivers, gives it a chance to clean up by calling its remove()

 *  function for each device it was responsible for, and marks those

 *  devices as driverless.

 */

void rio_unregister_driver(struct rio_driver *rdrv)

{

        driver_unregister(&rdrv->driver);

}

/**

 *  rio_match_bus - Tell if a RIO device structure has a matching RIO

 *                  driver device id structure

 *  @dev: the standard device structure to match against

 *  @drv: the standard driver structure containing the ids to match against

 *

 *  Used by a driver to check whether a RIO device present in the

 *  system is in its list of supported devices. Returns 1 if

 *  there is a matching &struct rio_device_id or 0 if there is

 *  no match.

 */

static int rio_match_bus(struct device *dev, struct device_driver *drv)

{

        struct rio_dev *rdev = to_rio_dev(dev);

        struct rio_driver *rdrv = to_rio_driver(drv);

        const struct rio_device_id *id = rdrv->id_table;

        const struct rio_device_id *found_id;

        if (!id)

                goto out;

        found_id = rio_match_device(id, rdev);

        if (found_id)

                return 1;

      out:return 0;

}

static struct device rio_bus = {

        .bus_id = "rapidio",

};

struct bus_type rio_bus_type = {

        .name = "rapidio",

        .match = rio_match_bus,

        .dev_attrs = rio_dev_attrs,

        .probe = rio_device_probe,

        .remove = rio_device_remove,

};

/**

 *  rio_bus_init - Register the RapidIO bus with the device model

 *

 *  Registers the RIO bus device and RIO bus type with the Linux

 *  device model.

 */

static int __init rio_bus_init(void)

{

        if (device_register(&rio_bus) < 0)

                printk("RIO: failed to register RIO bus device\n");

        return bus_register(&rio_bus_type);

}

postcore_initcall(rio_bus_init);

EXPORT_SYMBOL_GPL(rio_register_driver);

EXPORT_SYMBOL_GPL(rio_unregister_driver);

EXPORT_SYMBOL_GPL(rio_bus_type);

EXPORT_SYMBOL_GPL(rio_dev_get);

EXPORT_SYMBOL_GPL(rio_dev_put);