From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/rapidio/rio-driver.c | 260 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 260 insertions(+) create mode 100644 drivers/rapidio/rio-driver.c (limited to 'drivers/rapidio/rio-driver.c') diff --git a/drivers/rapidio/rio-driver.c b/drivers/rapidio/rio-driver.c new file mode 100644 index 000000000..f301f059b --- /dev/null +++ b/drivers/rapidio/rio-driver.c @@ -0,0 +1,260 @@ +/* + * RapidIO driver support + * + * Copyright 2005 MontaVista Software, Inc. + * Matt Porter + * + * 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 +#include +#include +#include + +#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); +} + +void rio_attach_device(struct rio_dev *rdev) +{ + rdev->dev.bus = &rio_bus_type; +} +EXPORT_SYMBOL_GPL(rio_attach_device); + +/** + * 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 int rio_uevent(struct device *dev, struct kobj_uevent_env *env) +{ + struct rio_dev *rdev; + + if (!dev) + return -ENODEV; + + rdev = to_rio_dev(dev); + if (!rdev) + return -ENODEV; + + if (add_uevent_var(env, "MODALIAS=rapidio:v%04Xd%04Xav%04Xad%04X", + rdev->vid, rdev->did, rdev->asm_vid, rdev->asm_did)) + return -ENOMEM; + return 0; +} + +struct class rio_mport_class = { + .name = "rapidio_port", + .owner = THIS_MODULE, + .dev_groups = rio_mport_groups, +}; +EXPORT_SYMBOL_GPL(rio_mport_class); + +struct bus_type rio_bus_type = { + .name = "rapidio", + .match = rio_match_bus, + .dev_groups = rio_dev_groups, + .bus_groups = rio_bus_groups, + .probe = rio_device_probe, + .remove = rio_device_remove, + .uevent = rio_uevent, +}; + +/** + * rio_bus_init - Register the RapidIO bus with the device model + * + * Registers the RIO mport device class and RIO bus type with the Linux + * device model. + */ +static int __init rio_bus_init(void) +{ + int ret; + + ret = class_register(&rio_mport_class); + if (!ret) { + ret = bus_register(&rio_bus_type); + if (ret) + class_unregister(&rio_mport_class); + } + return ret; +} + +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); -- cgit v1.2.3-54-g00ecf