[linux.git] / drivers / message / i2o / driver.c

/*
 *	Functions to handle I2O drivers (OSMs) and I2O bus type for sysfs
 *
 *	Copyright (C) 2004	Markus Lidel <[email protected]>
 *
 *	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.
 *
 *	Fixes/additions:
 *		Markus Lidel <[email protected]>
 *			initial version.
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/rwsem.h>
#include <linux/i2o.h>
#include <linux/workqueue.h>
#include <linux/string.h>
#include <linux/slab.h>
#include "core.h"

#define OSM_NAME	"i2o"

/* max_drivers - Maximum I2O drivers (OSMs) which could be registered */
static unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
module_param_named(max_drivers, i2o_max_drivers, uint, 0);
MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support");

/* I2O drivers lock and array */
static spinlock_t i2o_drivers_lock;
static struct i2o_driver **i2o_drivers;

/**
 *	i2o_bus_match - Tell if a I2O device class id match the class ids of
 *			the I2O driver (OSM)
 *
 *	@dev: device which should be verified
 *	@drv: the driver to match against
 *
 *	Used by the bus to check if the driver wants to handle the device.
 *
 *	Returns 1 if the class ids of the driver match the class id of the
 *	device, otherwise 0.
 */
static int i2o_bus_match(struct device *dev, struct device_driver *drv)
{
	struct i2o_device *i2o_dev = to_i2o_device(dev);
	struct i2o_driver *i2o_drv = to_i2o_driver(drv);
	struct i2o_class_id *ids = i2o_drv->classes;

	if (ids)
		while (ids->class_id != I2O_CLASS_END) {
			if (ids->class_id == i2o_dev->lct_data.class_id)
				return 1;
			ids++;
		}
	return 0;
};

/* I2O bus type */
struct bus_type i2o_bus_type = {
	.name = "i2o",
	.match = i2o_bus_match,
	.dev_attrs = i2o_device_attrs
};

/**
 *	i2o_driver_register - Register a I2O driver (OSM) in the I2O core
 *	@drv: I2O driver which should be registered
 *
 *	Registers the OSM drv in the I2O core and creates an event queues if
 *	necessary.
 *
 *	Returns 0 on success or negative error code on failure.
 */
int i2o_driver_register(struct i2o_driver *drv)
{
	struct i2o_controller *c;
	int i;
	int rc = 0;
	unsigned long flags;

	osm_debug("Register driver %s\n", drv->name);

	if (drv->event) {
		drv->event_queue = create_workqueue(drv->name);
		if (!drv->event_queue) {
			osm_err("Could not initialize event queue for driver "
				"%s\n", drv->name);
			return -EFAULT;
		}
		osm_debug("Event queue initialized for driver %s\n", drv->name);
	} else
		drv->event_queue = NULL;

	drv->driver.name = drv->name;
	drv->driver.bus = &i2o_bus_type;

	spin_lock_irqsave(&i2o_drivers_lock, flags);

	for (i = 0; i2o_drivers[i]; i++)
		if (i >= i2o_max_drivers) {
			osm_err("too many drivers registered, increase "
				"max_drivers\n");
			spin_unlock_irqrestore(&i2o_drivers_lock, flags);
			return -EFAULT;
		}

	drv->context = i;
	i2o_drivers[i] = drv;

	spin_unlock_irqrestore(&i2o_drivers_lock, flags);

	osm_debug("driver %s gets context id %d\n", drv->name, drv->context);

	list_for_each_entry(c, &i2o_controllers, list) {
		struct i2o_device *i2o_dev;

		i2o_driver_notify_controller_add(drv, c);
		list_for_each_entry(i2o_dev, &c->devices, list)
		    i2o_driver_notify_device_add(drv, i2o_dev);
	}

	rc = driver_register(&drv->driver);
	if (rc)
		destroy_workqueue(drv->event_queue);

	return rc;
};

/**
 *	i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core
 *	@drv: I2O driver which should be unregistered
 *
 *	Unregisters the OSM drv from the I2O core and cleanup event queues if
 *	necessary.
 */
void i2o_driver_unregister(struct i2o_driver *drv)
{
	struct i2o_controller *c;
	unsigned long flags;

	osm_debug("unregister driver %s\n", drv->name);

	driver_unregister(&drv->driver);

	list_for_each_entry(c, &i2o_controllers, list) {
		struct i2o_device *i2o_dev;

		list_for_each_entry(i2o_dev, &c->devices, list)
		    i2o_driver_notify_device_remove(drv, i2o_dev);

		i2o_driver_notify_controller_remove(drv, c);
	}

	spin_lock_irqsave(&i2o_drivers_lock, flags);
	i2o_drivers[drv->context] = NULL;
	spin_unlock_irqrestore(&i2o_drivers_lock, flags);

	if (drv->event_queue) {
		destroy_workqueue(drv->event_queue);
		drv->event_queue = NULL;
		osm_debug("event queue removed for %s\n", drv->name);
	}
};

/**
 *	i2o_driver_dispatch - dispatch an I2O reply message
 *	@c: I2O controller of the message
 *	@m: I2O message number
 *	@msg: I2O message to be delivered
 *
 *	The reply is delivered to the driver from which the original message
 *	was. This function is only called from interrupt context.
 *
 *	Returns 0 on success and the message should not be flushed. Returns > 0
 *	on success and if the message should be flushed afterwords. Returns
 *	negative error code on failure (the message will be flushed too).
 */
int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
{
	struct i2o_driver *drv;
	struct i2o_message *msg = i2o_msg_out_to_virt(c, m);
	u32 context = le32_to_cpu(msg->u.s.icntxt);
	unsigned long flags;

	if (unlikely(context >= i2o_max_drivers)) {
		osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
			 context);
		return -EIO;
	}

	spin_lock_irqsave(&i2o_drivers_lock, flags);
	drv = i2o_drivers[context];
	spin_unlock_irqrestore(&i2o_drivers_lock, flags);

	if (unlikely(!drv)) {
		osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
			 context);
		return -EIO;
	}

	if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
		struct i2o_device *dev, *tmp;
		struct i2o_event *evt;
		u16 size;
		u16 tid = le32_to_cpu(msg->u.head[1]) & 0xfff;

		osm_debug("event received from device %d\n", tid);

		if (!drv->event)
			return -EIO;

		/* cut of header from message size (in 32-bit words) */
		size = (le32_to_cpu(msg->u.head[0]) >> 16) - 5;

		evt = kzalloc(size * 4 + sizeof(*evt), GFP_ATOMIC);
		if (!evt)
			return -ENOMEM;

		evt->size = size;
		evt->tcntxt = le32_to_cpu(msg->u.s.tcntxt);
		evt->event_indicator = le32_to_cpu(msg->body[0]);
		memcpy(&evt->data, &msg->body[1], size * 4);

		list_for_each_entry_safe(dev, tmp, &c->devices, list)
		    if (dev->lct_data.tid == tid) {
			evt->i2o_dev = dev;
			break;
		}

		INIT_WORK(&evt->work, (void (*)(void *))drv->event, evt);
		queue_work(drv->event_queue, &evt->work);
		return 1;
	}

	if (unlikely(!drv->reply)) {
		osm_debug("%s: Reply to driver %s, but no reply function"
			  " defined!\n", c->name, drv->name);
		return -EIO;
	}

	return drv->reply(c, m, msg);
}

/**
 *	i2o_driver_notify_controller_add_all - Send notify of added controller
 *					       to all I2O drivers
 *
 *	Send notifications to all registered drivers that a new controller was
 *	added.
 */
void i2o_driver_notify_controller_add_all(struct i2o_controller *c)
{
	int i;
	struct i2o_driver *drv;

	for (i = 0; i < I2O_MAX_DRIVERS; i++) {
		drv = i2o_drivers[i];

		if (drv)
			i2o_driver_notify_controller_add(drv, c);
	}
}

/**
 *	i2o_driver_notify_controller_remove_all - Send notify of removed
 *						  controller to all I2O drivers
 *
 *	Send notifications to all registered drivers that a controller was
 *	removed.
 */
void i2o_driver_notify_controller_remove_all(struct i2o_controller *c)
{
	int i;
	struct i2o_driver *drv;

	for (i = 0; i < I2O_MAX_DRIVERS; i++) {
		drv = i2o_drivers[i];

		if (drv)
			i2o_driver_notify_controller_remove(drv, c);
	}
}

/**
 *	i2o_driver_notify_device_add_all - Send notify of added device to all
 *					   I2O drivers
 *
 *	Send notifications to all registered drivers that a device was added.
 */
void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev)
{
	int i;
	struct i2o_driver *drv;

	for (i = 0; i < I2O_MAX_DRIVERS; i++) {
		drv = i2o_drivers[i];

		if (drv)
			i2o_driver_notify_device_add(drv, i2o_dev);
	}
}

/**
 *	i2o_driver_notify_device_remove_all - Send notify of removed device to
 *					      all I2O drivers
 *
 *	Send notifications to all registered drivers that a device was removed.
 */
void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev)
{
	int i;
	struct i2o_driver *drv;

	for (i = 0; i < I2O_MAX_DRIVERS; i++) {
		drv = i2o_drivers[i];

		if (drv)
			i2o_driver_notify_device_remove(drv, i2o_dev);
	}
}

/**
 *	i2o_driver_init - initialize I2O drivers (OSMs)
 *
 *	Registers the I2O bus and allocate memory for the array of OSMs.
 *
 *	Returns 0 on success or negative error code on failure.
 */
int __init i2o_driver_init(void)
{
	int rc = 0;

	spin_lock_init(&i2o_drivers_lock);

	if ((i2o_max_drivers < 2) || (i2o_max_drivers > 64) ||
	    ((i2o_max_drivers ^ (i2o_max_drivers - 1)) !=
	     (2 * i2o_max_drivers - 1))) {
		osm_warn("max_drivers set to %d, but must be >=2 and <= 64 and "
			 "a power of 2\n", i2o_max_drivers);
		i2o_max_drivers = I2O_MAX_DRIVERS;
	}
	osm_info("max drivers = %d\n", i2o_max_drivers);

	i2o_drivers =
	    kzalloc(i2o_max_drivers * sizeof(*i2o_drivers), GFP_KERNEL);
	if (!i2o_drivers)
		return -ENOMEM;

	rc = bus_register(&i2o_bus_type);

	if (rc < 0)
		kfree(i2o_drivers);

	return rc;
};

/**
 *	i2o_driver_exit - clean up I2O drivers (OSMs)
 *
 *	Unregisters the I2O bus and free driver array.
 */
void __exit i2o_driver_exit(void)
{
	bus_unregister(&i2o_bus_type);
	kfree(i2o_drivers);
};

EXPORT_SYMBOL(i2o_driver_register);
EXPORT_SYMBOL(i2o_driver_unregister);
EXPORT_SYMBOL(i2o_driver_notify_controller_add_all);
EXPORT_SYMBOL(i2o_driver_notify_controller_remove_all);
EXPORT_SYMBOL(i2o_driver_notify_device_add_all);
EXPORT_SYMBOL(i2o_driver_notify_device_remove_all);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Functions to handle I2O drivers (OSMs) and I2O bus type for sysfs
	3	*
	4	* Copyright (C) 2004 Markus Lidel <[email protected]>
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* option) any later version.
	10	*
	11	* Fixes/additions:
	12	* Markus Lidel <[email protected]>
	13	* initial version.
	14	*/
	15
	16	#include <linux/device.h>
	17	#include <linux/module.h>
	18	#include <linux/rwsem.h>
	19	#include <linux/i2o.h>
4e57b681 TS	20	#include <linux/workqueue.h>
	21	#include <linux/string.h>
	22	#include <linux/slab.h>
9e87545f	23	#include "core.h"
1da177e4	24
f88e119c	25	#define OSM_NAME "i2o"
61fbfa81	26
1da177e4	27	/* max_drivers - Maximum I2O drivers (OSMs) which could be registered */
9e87545f	28	static unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
1da177e4 LT	29	module_param_named(max_drivers, i2o_max_drivers, uint, 0);
	30	MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support");
	31
	32	/* I2O drivers lock and array */
	33	static spinlock_t i2o_drivers_lock;
	34	static struct i2o_driver **i2o_drivers;
	35
	36	/**
	37	* i2o_bus_match - Tell if a I2O device class id match the class ids of
	38	* the I2O driver (OSM)
	39	*
	40	* @dev: device which should be verified
	41	* @drv: the driver to match against
	42	*
	43	* Used by the bus to check if the driver wants to handle the device.
	44	*
	45	* Returns 1 if the class ids of the driver match the class id of the
	46	* device, otherwise 0.
	47	*/
	48	static int i2o_bus_match(struct device dev, struct device_driver drv)
	49	{
	50	struct i2o_device *i2o_dev = to_i2o_device(dev);
	51	struct i2o_driver *i2o_drv = to_i2o_driver(drv);
	52	struct i2o_class_id *ids = i2o_drv->classes;
	53
	54	if (ids)
	55	while (ids->class_id != I2O_CLASS_END) {
	56	if (ids->class_id == i2o_dev->lct_data.class_id)
	57	return 1;
	58	ids++;
	59	}
	60	return 0;
	61	};
	62
	63	/* I2O bus type */
	64	struct bus_type i2o_bus_type = {
	65	.name = "i2o",
	66	.match = i2o_bus_match,
2e1973a3	67	.dev_attrs = i2o_device_attrs
1da177e4 LT	68	};
	69
	70	/**
	71	* i2o_driver_register - Register a I2O driver (OSM) in the I2O core
	72	* @drv: I2O driver which should be registered
	73	*
	74	* Registers the OSM drv in the I2O core and creates an event queues if
	75	* necessary.
	76	*
	77	* Returns 0 on success or negative error code on failure.
	78	*/
	79	int i2o_driver_register(struct i2o_driver *drv)
	80	{
	81	struct i2o_controller *c;
	82	int i;
	83	int rc = 0;
	84	unsigned long flags;
	85
f88e119c	86	osm_debug("Register driver %s\n", drv->name);
1da177e4 LT	87
	88	if (drv->event) {
	89	drv->event_queue = create_workqueue(drv->name);
	90	if (!drv->event_queue) {
f88e119c ML	91	osm_err("Could not initialize event queue for driver "
f88e119c ML	92	"%s\n", drv->name);
1da177e4 LT	93	return -EFAULT;
1da177e4 LT	94	}
f88e119c	95	osm_debug("Event queue initialized for driver %s\n", drv->name);
1da177e4 LT	96	} else
	97	drv->event_queue = NULL;
	98
	99	drv->driver.name = drv->name;
	100	drv->driver.bus = &i2o_bus_type;
	101
	102	spin_lock_irqsave(&i2o_drivers_lock, flags);
	103
	104	for (i = 0; i2o_drivers[i]; i++)
	105	if (i >= i2o_max_drivers) {
f88e119c ML	106	osm_err("too many drivers registered, increase "
f88e119c ML	107	"max_drivers\n");
1da177e4 LT	108	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
	109	return -EFAULT;
	110	}
	111
	112	drv->context = i;
	113	i2o_drivers[i] = drv;
	114
	115	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
	116
f88e119c	117	osm_debug("driver %s gets context id %d\n", drv->name, drv->context);
1da177e4 LT	118
	119	list_for_each_entry(c, &i2o_controllers, list) {
	120	struct i2o_device *i2o_dev;
	121
	122	i2o_driver_notify_controller_add(drv, c);
	123	list_for_each_entry(i2o_dev, &c->devices, list)
f33213ec	124	i2o_driver_notify_device_add(drv, i2o_dev);
1da177e4 LT	125	}
1da177e4 LT	126
1da177e4 LT	127	rc = driver_register(&drv->driver);
	128	if (rc)
	129	destroy_workqueue(drv->event_queue);
	130
	131	return rc;
	132	};
	133
	134	/**
	135	* i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core
	136	* @drv: I2O driver which should be unregistered
	137	*
	138	* Unregisters the OSM drv from the I2O core and cleanup event queues if
	139	* necessary.
	140	*/
	141	void i2o_driver_unregister(struct i2o_driver *drv)
	142	{
	143	struct i2o_controller *c;
	144	unsigned long flags;
	145
f88e119c	146	osm_debug("unregister driver %s\n", drv->name);
1da177e4 LT	147
	148	driver_unregister(&drv->driver);
	149
	150	list_for_each_entry(c, &i2o_controllers, list) {
	151	struct i2o_device *i2o_dev;
	152
	153	list_for_each_entry(i2o_dev, &c->devices, list)
	154	i2o_driver_notify_device_remove(drv, i2o_dev);
	155
	156	i2o_driver_notify_controller_remove(drv, c);
	157	}
	158
	159	spin_lock_irqsave(&i2o_drivers_lock, flags);
	160	i2o_drivers[drv->context] = NULL;
	161	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
	162
	163	if (drv->event_queue) {
	164	destroy_workqueue(drv->event_queue);
	165	drv->event_queue = NULL;
f88e119c	166	osm_debug("event queue removed for %s\n", drv->name);
1da177e4 LT	167	}
	168	};
	169
	170	/**
	171	* i2o_driver_dispatch - dispatch an I2O reply message
	172	* @c: I2O controller of the message
	173	* @m: I2O message number
	174	* @msg: I2O message to be delivered
	175	*
	176	* The reply is delivered to the driver from which the original message
	177	* was. This function is only called from interrupt context.
	178	*
	179	* Returns 0 on success and the message should not be flushed. Returns > 0
	180	* on success and if the message should be flushed afterwords. Returns
	181	* negative error code on failure (the message will be flushed too).
	182	*/
f88e119c	183	int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
1da177e4 LT	184	{
1da177e4 LT	185	struct i2o_driver *drv;
9e87545f ML	186	struct i2o_message *msg = i2o_msg_out_to_virt(c, m);
9e87545f ML	187	u32 context = le32_to_cpu(msg->u.s.icntxt);
f10378ff ML	188	unsigned long flags;
f10378ff ML	189
61fbfa81	190	if (unlikely(context >= i2o_max_drivers)) {
f88e119c ML	191	osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
f88e119c ML	192	context);
61fbfa81 ML	193	return -EIO;
61fbfa81 ML	194	}
1da177e4	195
f10378ff	196	spin_lock_irqsave(&i2o_drivers_lock, flags);
61fbfa81	197	drv = i2o_drivers[context];
f10378ff	198	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
1da177e4	199
61fbfa81	200	if (unlikely(!drv)) {
f88e119c ML	201	osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
f88e119c ML	202	context);
61fbfa81 ML	203	return -EIO;
61fbfa81 ML	204	}
1da177e4	205
9e87545f	206	if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
61fbfa81 ML	207	struct i2o_device dev, tmp;
	208	struct i2o_event *evt;
	209	u16 size;
9e87545f	210	u16 tid = le32_to_cpu(msg->u.head[1]) & 0xfff;
1da177e4	211
61fbfa81	212	osm_debug("event received from device %d\n", tid);
1da177e4	213
f88e119c ML	214	if (!drv->event)
	215	return -EIO;
	216
61fbfa81	217	/* cut of header from message size (in 32-bit words) */
9e87545f	218	size = (le32_to_cpu(msg->u.head[0]) >> 16) - 5;
1da177e4	219
f6ed39a6	220	evt = kzalloc(size * 4 + sizeof(*evt), GFP_ATOMIC);
61fbfa81 ML	221	if (!evt)
61fbfa81 ML	222	return -ENOMEM;
1da177e4	223
61fbfa81	224	evt->size = size;
9e87545f ML	225	evt->tcntxt = le32_to_cpu(msg->u.s.tcntxt);
9e87545f ML	226	evt->event_indicator = le32_to_cpu(msg->body[0]);
dcceafe2	227	memcpy(&evt->data, &msg->body[1], size * 4);
1da177e4	228
61fbfa81 ML	229	list_for_each_entry_safe(dev, tmp, &c->devices, list)
	230	if (dev->lct_data.tid == tid) {
	231	evt->i2o_dev = dev;
	232	break;
1da177e4 LT	233	}
1da177e4 LT	234
61fbfa81 ML	235	INIT_WORK(&evt->work, (void ()(void ))drv->event, evt);
	236	queue_work(drv->event_queue, &evt->work);
	237	return 1;
	238	}
	239
	240	if (unlikely(!drv->reply)) {
f88e119c ML	241	osm_debug("%s: Reply to driver %s, but no reply function"
f88e119c ML	242	" defined!\n", c->name, drv->name);
1da177e4	243	return -EIO;
61fbfa81 ML	244	}
	245
	246	return drv->reply(c, m, msg);
1da177e4 LT	247	}
	248
	249	/**
	250	* i2o_driver_notify_controller_add_all - Send notify of added controller
	251	* to all I2O drivers
	252	*
	253	* Send notifications to all registered drivers that a new controller was
	254	* added.
	255	*/
	256	void i2o_driver_notify_controller_add_all(struct i2o_controller *c)
	257	{
	258	int i;
	259	struct i2o_driver *drv;
	260
	261	for (i = 0; i < I2O_MAX_DRIVERS; i++) {
	262	drv = i2o_drivers[i];
	263
	264	if (drv)
	265	i2o_driver_notify_controller_add(drv, c);
	266	}
	267	}
	268
	269	/**
	270	* i2o_driver_notify_controller_remove_all - Send notify of removed
	271	* controller to all I2O drivers
	272	*
	273	* Send notifications to all registered drivers that a controller was
	274	* removed.
	275	*/
	276	void i2o_driver_notify_controller_remove_all(struct i2o_controller *c)
	277	{
	278	int i;
	279	struct i2o_driver *drv;
	280
	281	for (i = 0; i < I2O_MAX_DRIVERS; i++) {
	282	drv = i2o_drivers[i];
	283
	284	if (drv)
	285	i2o_driver_notify_controller_remove(drv, c);
	286	}
	287	}
	288
	289	/**
	290	* i2o_driver_notify_device_add_all - Send notify of added device to all
	291	* I2O drivers
	292	*
	293	* Send notifications to all registered drivers that a device was added.
	294	*/
	295	void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev)
	296	{
	297	int i;
	298	struct i2o_driver *drv;
	299
	300	for (i = 0; i < I2O_MAX_DRIVERS; i++) {
	301	drv = i2o_drivers[i];
	302
	303	if (drv)
	304	i2o_driver_notify_device_add(drv, i2o_dev);
	305	}
	306	}
	307
	308	/**
	309	* i2o_driver_notify_device_remove_all - Send notify of removed device to
	310	* all I2O drivers
311	*
312	* Send notifications to all registered drivers that a device was removed.
313	*/
314	void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev)
315	{
316	int i;
317	struct i2o_driver *drv;
318
319	for (i = 0; i < I2O_MAX_DRIVERS; i++) {
320	drv = i2o_drivers[i];
321
322	if (drv)
323	i2o_driver_notify_device_remove(drv, i2o_dev);
324	}
325	}
326
327	/**
328	* i2o_driver_init - initialize I2O drivers (OSMs)
329	*
330	* Registers the I2O bus and allocate memory for the array of OSMs.
331	*
332	* Returns 0 on success or negative error code on failure.
333	*/
334	int __init i2o_driver_init(void)
335	{
336	int rc = 0;
337
338	spin_lock_init(&i2o_drivers_lock);
339
340	if ((i2o_max_drivers < 2) \|\| (i2o_max_drivers > 64) \|\|
341	((i2o_max_drivers ^ (i2o_max_drivers - 1)) !=
342	(2 * i2o_max_drivers - 1))) {
f88e119c ML	343	osm_warn("max_drivers set to %d, but must be >=2 and <= 64 and "
f88e119c ML	344	"a power of 2\n", i2o_max_drivers);
1da177e4 LT	345	i2o_max_drivers = I2O_MAX_DRIVERS;
1da177e4 LT	346	}
f88e119c	347	osm_info("max drivers = %d\n", i2o_max_drivers);
1da177e4 LT	348
1da177e4 LT	349	i2o_drivers =
f6ed39a6	350	kzalloc(i2o_max_drivers * sizeof(*i2o_drivers), GFP_KERNEL);
1da177e4 LT	351	if (!i2o_drivers)
	352	return -ENOMEM;
	353
1da177e4 LT	354	rc = bus_register(&i2o_bus_type);
	355
	356	if (rc < 0)
	357	kfree(i2o_drivers);
	358
	359	return rc;
	360	};
	361
	362	/**
	363	* i2o_driver_exit - clean up I2O drivers (OSMs)
	364	*
	365	* Unregisters the I2O bus and free driver array.
	366	*/
	367	void __exit i2o_driver_exit(void)
	368	{
	369	bus_unregister(&i2o_bus_type);
	370	kfree(i2o_drivers);
	371	};
	372
	373	EXPORT_SYMBOL(i2o_driver_register);
	374	EXPORT_SYMBOL(i2o_driver_unregister);
	375	EXPORT_SYMBOL(i2o_driver_notify_controller_add_all);
	376	EXPORT_SYMBOL(i2o_driver_notify_controller_remove_all);
	377	EXPORT_SYMBOL(i2o_driver_notify_device_add_all);
	378	EXPORT_SYMBOL(i2o_driver_notify_device_remove_all);