/* * 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);