159 lines
3.7 KiB
C
159 lines
3.7 KiB
C
/*
|
|
* DIO Driver Services
|
|
*
|
|
* Copyright (C) 2004 Jochen Friedrich
|
|
*
|
|
* Loosely based on drivers/pci/pci-driver.c and drivers/zorro/zorro-driver.c
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file COPYING in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/dio.h>
|
|
|
|
|
|
/**
|
|
* dio_match_device - Tell if a DIO device structure has a matching
|
|
* DIO device id structure
|
|
* @ids: array of DIO device id structures to search in
|
|
* @dev: the DIO device structure to match against
|
|
*
|
|
* Used by a driver to check whether a DIO device present in the
|
|
* system is in its list of supported devices. Returns the matching
|
|
* dio_device_id structure or %NULL if there is no match.
|
|
*/
|
|
|
|
const struct dio_device_id *
|
|
dio_match_device(const struct dio_device_id *ids,
|
|
const struct dio_dev *d)
|
|
{
|
|
while (ids->id) {
|
|
if (ids->id == DIO_WILDCARD)
|
|
return ids;
|
|
if (DIO_NEEDSSECID(ids->id & 0xff)) {
|
|
if (ids->id == d->id)
|
|
return ids;
|
|
} else {
|
|
if ((ids->id & 0xff) == (d->id & 0xff))
|
|
return ids;
|
|
}
|
|
ids++;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int dio_device_probe(struct device *dev)
|
|
{
|
|
int error = 0;
|
|
struct dio_driver *drv = to_dio_driver(dev->driver);
|
|
struct dio_dev *d = to_dio_dev(dev);
|
|
|
|
if (!d->driver && drv->probe) {
|
|
const struct dio_device_id *id;
|
|
|
|
id = dio_match_device(drv->id_table, d);
|
|
if (id)
|
|
error = drv->probe(d, id);
|
|
if (error >= 0) {
|
|
d->driver = drv;
|
|
error = 0;
|
|
}
|
|
}
|
|
return error;
|
|
}
|
|
|
|
|
|
/**
|
|
* dio_register_driver - register a new DIO driver
|
|
* @drv: the driver structure to register
|
|
*
|
|
* Adds the driver structure to the list of registered drivers
|
|
* Returns zero or a negative error value.
|
|
*/
|
|
|
|
int dio_register_driver(struct dio_driver *drv)
|
|
{
|
|
/* initialize common driver fields */
|
|
drv->driver.name = drv->name;
|
|
drv->driver.bus = &dio_bus_type;
|
|
|
|
/* register with core */
|
|
return driver_register(&drv->driver);
|
|
}
|
|
|
|
|
|
/**
|
|
* dio_unregister_driver - unregister a DIO driver
|
|
* @drv: the driver structure to unregister
|
|
*
|
|
* Deletes the driver structure from the list of registered DIO 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 dio_unregister_driver(struct dio_driver *drv)
|
|
{
|
|
driver_unregister(&drv->driver);
|
|
}
|
|
|
|
|
|
/**
|
|
* dio_bus_match - Tell if a DIO device structure has a matching DIO
|
|
* device id structure
|
|
* @ids: array of DIO device id structures to search in
|
|
* @dev: the DIO device structure to match against
|
|
*
|
|
* Used by a driver to check whether a DIO device present in the
|
|
* system is in its list of supported devices. Returns the matching
|
|
* dio_device_id structure or %NULL if there is no match.
|
|
*/
|
|
|
|
static int dio_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct dio_dev *d = to_dio_dev(dev);
|
|
struct dio_driver *dio_drv = to_dio_driver(drv);
|
|
const struct dio_device_id *ids = dio_drv->id_table;
|
|
|
|
if (!ids)
|
|
return 0;
|
|
|
|
while (ids->id) {
|
|
if (ids->id == DIO_WILDCARD)
|
|
return 1;
|
|
if (DIO_NEEDSSECID(ids->id & 0xff)) {
|
|
if (ids->id == d->id)
|
|
return 1;
|
|
} else {
|
|
if ((ids->id & 0xff) == (d->id & 0xff))
|
|
return 1;
|
|
}
|
|
ids++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct bus_type dio_bus_type = {
|
|
.name = "dio",
|
|
.match = dio_bus_match,
|
|
.probe = dio_device_probe,
|
|
};
|
|
|
|
|
|
static int __init dio_driver_init(void)
|
|
{
|
|
return bus_register(&dio_bus_type);
|
|
}
|
|
|
|
postcore_initcall(dio_driver_init);
|
|
|
|
EXPORT_SYMBOL(dio_match_device);
|
|
EXPORT_SYMBOL(dio_register_driver);
|
|
EXPORT_SYMBOL(dio_unregister_driver);
|
|
EXPORT_SYMBOL(dio_dev_driver);
|
|
EXPORT_SYMBOL(dio_bus_type);
|