1/*
  2 *  DIO Driver Services
  3 *
  4 *  Copyright (C) 2004 Jochen Friedrich
  5 *
  6 *  Loosely based on drivers/pci/pci-driver.c and drivers/zorro/zorro-driver.c
  7 *
  8 *  This file is subject to the terms and conditions of the GNU General Public
  9 *  License.  See the file COPYING in the main directory of this archive
 10 *  for more details.
 11 */
 12
 13#include <linux/init.h>
 14#include <linux/module.h>
 15#include <linux/dio.h>
 16
 17
 18/**
 19 *  dio_match_device - Tell if a DIO device structure has a matching DIO device id structure
 20 *  @ids: array of DIO device id structures to search in
 21 *  @d: the DIO device structure to match against
 22 *
 23 *  Used by a driver to check whether a DIO device present in the
 24 *  system is in its list of supported devices. Returns the matching
 25 *  dio_device_id structure or %NULL if there is no match.
 26 */
 27
 28static const struct dio_device_id *
 29dio_match_device(const struct dio_device_id *ids,
 30		   const struct dio_dev *d)
 31{
 32	while (ids->id) {
 33		if (ids->id == DIO_WILDCARD)
 34			return ids;
 35		if (DIO_NEEDSSECID(ids->id & 0xff)) {
 36			if (ids->id == d->id)
 37				return ids;
 38		} else {
 39			if ((ids->id & 0xff) == (d->id & 0xff))
 40				return ids;
 41		}
 42		ids++;
 43	}
 44	return NULL;
 45}
 46
 47static int dio_device_probe(struct device *dev)
 48{
 49	int error = 0;
 50	struct dio_driver *drv = to_dio_driver(dev->driver);
 51	struct dio_dev *d = to_dio_dev(dev);
 52
 53	if (!d->driver && drv->probe) {
 54		const struct dio_device_id *id;
 55
 56		id = dio_match_device(drv->id_table, d);
 57		if (id)
 58			error = drv->probe(d, id);
 59		if (error >= 0) {
 60			d->driver = drv;
 61			error = 0;
 62		}
 63	}
 64	return error;
 65}
 66
 67
 68/**
 69 *  dio_register_driver - register a new DIO driver
 70 *  @drv: the driver structure to register
 71 *
 72 *  Adds the driver structure to the list of registered drivers
 73 *  Returns zero or a negative error value.
 74 */
 75
 76int dio_register_driver(struct dio_driver *drv)
 77{
 78	/* initialize common driver fields */
 79	drv->driver.name = drv->name;
 80	drv->driver.bus = &dio_bus_type;
 81
 82	/* register with core */
 83	return driver_register(&drv->driver);
 84}
 85
 86
 87/**
 88 *  dio_unregister_driver - unregister a DIO driver
 89 *  @drv: the driver structure to unregister
 90 *
 91 *  Deletes the driver structure from the list of registered DIO drivers,
 92 *  gives it a chance to clean up by calling its remove() function for
 93 *  each device it was responsible for, and marks those devices as
 94 *  driverless.
 95 */
 96
 97void dio_unregister_driver(struct dio_driver *drv)
 98{
 99	driver_unregister(&drv->driver);
100}
101
102
103/**
104 *  dio_bus_match - Tell if a DIO device structure has a matching DIO device id structure
105 *  @dev: the DIO device structure to match against
106 *  @drv: the &device_driver that points to the array of DIO device id structures to search
107 *
108 *  Used by the driver core to check whether a DIO device present in the
109 *  system is in a driver's list of supported devices. Returns 1 if supported,
110 *  and 0 if there is no match.
111 */
112
113static int dio_bus_match(struct device *dev, struct device_driver *drv)
114{
115	struct dio_dev *d = to_dio_dev(dev);
116	struct dio_driver *dio_drv = to_dio_driver(drv);
117	const struct dio_device_id *ids = dio_drv->id_table;
118
119	if (!ids)
120		return 0;
121
122	return dio_match_device(ids, d) ? 1 : 0;
123}
124
125
126struct bus_type dio_bus_type = {
127	.name	= "dio",
128	.match	= dio_bus_match,
129	.probe	= dio_device_probe,
130};
131
132
133static int __init dio_driver_init(void)
134{
135	return bus_register(&dio_bus_type);
136}
137
138postcore_initcall(dio_driver_init);
139
 
140EXPORT_SYMBOL(dio_register_driver);
141EXPORT_SYMBOL(dio_unregister_driver);
142EXPORT_SYMBOL(dio_bus_type);

  1/*
  2 *  DIO Driver Services
  3 *
  4 *  Copyright (C) 2004 Jochen Friedrich
  5 *
  6 *  Loosely based on drivers/pci/pci-driver.c and drivers/zorro/zorro-driver.c
  7 *
  8 *  This file is subject to the terms and conditions of the GNU General Public
  9 *  License.  See the file COPYING in the main directory of this archive
 10 *  for more details.
 11 */
 12
 13#include <linux/init.h>
 14#include <linux/module.h>
 15#include <linux/dio.h>
 16
 17
 18/**
 19 *  dio_match_device - Tell if a DIO device structure has a matching DIO device id structure
 20 *  @ids: array of DIO device id structures to search in
 21 *  @d: the DIO device structure to match against
 22 *
 23 *  Used by a driver to check whether a DIO device present in the
 24 *  system is in its list of supported devices. Returns the matching
 25 *  dio_device_id structure or %NULL if there is no match.
 26 */
 27
 28const struct dio_device_id *
 29dio_match_device(const struct dio_device_id *ids,
 30		   const struct dio_dev *d)
 31{
 32	while (ids->id) {
 33		if (ids->id == DIO_WILDCARD)
 34			return ids;
 35		if (DIO_NEEDSSECID(ids->id & 0xff)) {
 36			if (ids->id == d->id)
 37				return ids;
 38		} else {
 39			if ((ids->id & 0xff) == (d->id & 0xff))
 40				return ids;
 41		}
 42		ids++;
 43	}
 44	return NULL;
 45}
 46
 47static int dio_device_probe(struct device *dev)
 48{
 49	int error = 0;
 50	struct dio_driver *drv = to_dio_driver(dev->driver);
 51	struct dio_dev *d = to_dio_dev(dev);
 52
 53	if (!d->driver && drv->probe) {
 54		const struct dio_device_id *id;
 55
 56		id = dio_match_device(drv->id_table, d);
 57		if (id)
 58			error = drv->probe(d, id);
 59		if (error >= 0) {
 60			d->driver = drv;
 61			error = 0;
 62		}
 63	}
 64	return error;
 65}
 66
 67
 68/**
 69 *  dio_register_driver - register a new DIO driver
 70 *  @drv: the driver structure to register
 71 *
 72 *  Adds the driver structure to the list of registered drivers
 73 *  Returns zero or a negative error value.
 74 */
 75
 76int dio_register_driver(struct dio_driver *drv)
 77{
 78	/* initialize common driver fields */
 79	drv->driver.name = drv->name;
 80	drv->driver.bus = &dio_bus_type;
 81
 82	/* register with core */
 83	return driver_register(&drv->driver);
 84}
 85
 86
 87/**
 88 *  dio_unregister_driver - unregister a DIO driver
 89 *  @drv: the driver structure to unregister
 90 *
 91 *  Deletes the driver structure from the list of registered DIO drivers,
 92 *  gives it a chance to clean up by calling its remove() function for
 93 *  each device it was responsible for, and marks those devices as
 94 *  driverless.
 95 */
 96
 97void dio_unregister_driver(struct dio_driver *drv)
 98{
 99	driver_unregister(&drv->driver);
100}
101
102
103/**
104 *  dio_bus_match - Tell if a DIO device structure has a matching DIO device id structure
105 *  @dev: the DIO device structure to match against
106 *  @drv: the &device_driver that points to the array of DIO device id structures to search
107 *
108 *  Used by a driver to check whether a DIO device present in the
109 *  system is in its list of supported devices. Returns the matching
110 *  dio_device_id structure or %NULL if there is no match.
111 */
112
113static int dio_bus_match(struct device *dev, struct device_driver *drv)
114{
115	struct dio_dev *d = to_dio_dev(dev);
116	struct dio_driver *dio_drv = to_dio_driver(drv);
117	const struct dio_device_id *ids = dio_drv->id_table;
118
119	if (!ids)
120		return 0;
121
122	return dio_match_device(ids, d) ? 1 : 0;
123}
124
125
126struct bus_type dio_bus_type = {
127	.name	= "dio",
128	.match	= dio_bus_match,
129	.probe	= dio_device_probe,
130};
131
132
133static int __init dio_driver_init(void)
134{
135	return bus_register(&dio_bus_type);
136}
137
138postcore_initcall(dio_driver_init);
139
140EXPORT_SYMBOL(dio_match_device);
141EXPORT_SYMBOL(dio_register_driver);
142EXPORT_SYMBOL(dio_unregister_driver);
143EXPORT_SYMBOL(dio_bus_type);