/* * 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 * @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; } else 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);