[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 I2O device class id matches 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 = alloc_workqueue(drv->name,
						   WQ_MEM_RECLAIM, 1);
		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) {
		if (drv->event) {
			destroy_workqueue(drv->event_queue);
			drv->event_queue = NULL;
		}
	}

	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
 *
 *	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, drv->event);
		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
 *	@c: newly added controller
 *
 *	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
 *	@c: controller that is being removed
 *
 *	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
 *	@i2o_dev: newly added I2O device
 *
 *	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
 *	@i2o_dev: device that is being removed
 *
 *	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)) {
		osm_warn("max_drivers set to %d, but must be >=2 and <= 64\n",
			 i2o_max_drivers);
		i2o_max_drivers = I2O_MAX_DRIVERS;
	}
	osm_info("max drivers = %d\n", i2o_max_drivers);

	i2o_drivers =
	    kcalloc(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 frees driver array.
 */
void 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	/**
d9489fb6	37	* i2o_bus_match - Tell if I2O device class id matches the class ids of the I2O driver (OSM)
1da177e4 LT	38	* @dev: device which should be verified
	39	* @drv: the driver to match against
	40	*
	41	* Used by the bus to check if the driver wants to handle the device.
	42	*
	43	* Returns 1 if the class ids of the driver match the class id of the
	44	* device, otherwise 0.
	45	*/
	46	static int i2o_bus_match(struct device dev, struct device_driver drv)
	47	{
	48	struct i2o_device *i2o_dev = to_i2o_device(dev);
	49	struct i2o_driver *i2o_drv = to_i2o_driver(drv);
	50	struct i2o_class_id *ids = i2o_drv->classes;
	51
	52	if (ids)
	53	while (ids->class_id != I2O_CLASS_END) {
	54	if (ids->class_id == i2o_dev->lct_data.class_id)
	55	return 1;
	56	ids++;
	57	}
	58	return 0;
	59	};
	60
	61	/* I2O bus type */
	62	struct bus_type i2o_bus_type = {
	63	.name = "i2o",
	64	.match = i2o_bus_match,
2e1973a3	65	.dev_attrs = i2o_device_attrs
1da177e4 LT	66	};
	67
	68	/**
	69	* i2o_driver_register - Register a I2O driver (OSM) in the I2O core
	70	* @drv: I2O driver which should be registered
	71	*
	72	* Registers the OSM drv in the I2O core and creates an event queues if
	73	* necessary.
	74	*
	75	* Returns 0 on success or negative error code on failure.
	76	*/
	77	int i2o_driver_register(struct i2o_driver *drv)
	78	{
	79	struct i2o_controller *c;
	80	int i;
	81	int rc = 0;
	82	unsigned long flags;
	83
f88e119c	84	osm_debug("Register driver %s\n", drv->name);
1da177e4 LT	85
1da177e4 LT	86	if (drv->event) {
52286713 TH	87	drv->event_queue = alloc_workqueue(drv->name,
52286713 TH	88	WQ_MEM_RECLAIM, 1);
1da177e4	89	if (!drv->event_queue) {
f88e119c ML	90	osm_err("Could not initialize event queue for driver "
f88e119c ML	91	"%s\n", drv->name);
1da177e4 LT	92	return -EFAULT;
1da177e4 LT	93	}
f88e119c	94	osm_debug("Event queue initialized for driver %s\n", drv->name);
1da177e4 LT	95	} else
	96	drv->event_queue = NULL;
	97
	98	drv->driver.name = drv->name;
	99	drv->driver.bus = &i2o_bus_type;
	100
	101	spin_lock_irqsave(&i2o_drivers_lock, flags);
	102
	103	for (i = 0; i2o_drivers[i]; i++)
	104	if (i >= i2o_max_drivers) {
f88e119c ML	105	osm_err("too many drivers registered, increase "
f88e119c ML	106	"max_drivers\n");
1da177e4 LT	107	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
	108	return -EFAULT;
	109	}
	110
	111	drv->context = i;
	112	i2o_drivers[i] = drv;
	113
	114	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
	115
f88e119c	116	osm_debug("driver %s gets context id %d\n", drv->name, drv->context);
1da177e4 LT	117
	118	list_for_each_entry(c, &i2o_controllers, list) {
	119	struct i2o_device *i2o_dev;
	120
	121	i2o_driver_notify_controller_add(drv, c);
	122	list_for_each_entry(i2o_dev, &c->devices, list)
f33213ec	123	i2o_driver_notify_device_add(drv, i2o_dev);
1da177e4 LT	124	}
1da177e4 LT	125
1da177e4	126	rc = driver_register(&drv->driver);
e578e9a1 AM	127	if (rc) {
	128	if (drv->event) {
	129	destroy_workqueue(drv->event_queue);
	130	drv->event_queue = NULL;
	131	}
	132	}
1da177e4 LT	133
	134	return rc;
	135	};
	136
	137	/**
	138	* i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core
	139	* @drv: I2O driver which should be unregistered
	140	*
	141	* Unregisters the OSM drv from the I2O core and cleanup event queues if
	142	* necessary.
	143	*/
	144	void i2o_driver_unregister(struct i2o_driver *drv)
	145	{
	146	struct i2o_controller *c;
	147	unsigned long flags;
	148
f88e119c	149	osm_debug("unregister driver %s\n", drv->name);
1da177e4 LT	150
	151	driver_unregister(&drv->driver);
	152
	153	list_for_each_entry(c, &i2o_controllers, list) {
	154	struct i2o_device *i2o_dev;
	155
	156	list_for_each_entry(i2o_dev, &c->devices, list)
	157	i2o_driver_notify_device_remove(drv, i2o_dev);
	158
	159	i2o_driver_notify_controller_remove(drv, c);
	160	}
	161
	162	spin_lock_irqsave(&i2o_drivers_lock, flags);
	163	i2o_drivers[drv->context] = NULL;
	164	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
	165
	166	if (drv->event_queue) {
	167	destroy_workqueue(drv->event_queue);
	168	drv->event_queue = NULL;
f88e119c	169	osm_debug("event queue removed for %s\n", drv->name);
1da177e4 LT	170	}
	171	};
	172
	173	/**
	174	* i2o_driver_dispatch - dispatch an I2O reply message
	175	* @c: I2O controller of the message
	176	* @m: I2O message number
1da177e4 LT	177	*
	178	* The reply is delivered to the driver from which the original message
	179	* was. This function is only called from interrupt context.
	180	*
	181	* Returns 0 on success and the message should not be flushed. Returns > 0
	182	* on success and if the message should be flushed afterwords. Returns
	183	* negative error code on failure (the message will be flushed too).
	184	*/
f88e119c	185	int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
1da177e4 LT	186	{
1da177e4 LT	187	struct i2o_driver *drv;
9e87545f ML	188	struct i2o_message *msg = i2o_msg_out_to_virt(c, m);
9e87545f ML	189	u32 context = le32_to_cpu(msg->u.s.icntxt);
f10378ff ML	190	unsigned long flags;
f10378ff ML	191
61fbfa81	192	if (unlikely(context >= i2o_max_drivers)) {
f88e119c ML	193	osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
f88e119c ML	194	context);
61fbfa81 ML	195	return -EIO;
61fbfa81 ML	196	}
1da177e4	197
f10378ff	198	spin_lock_irqsave(&i2o_drivers_lock, flags);
61fbfa81	199	drv = i2o_drivers[context];
f10378ff	200	spin_unlock_irqrestore(&i2o_drivers_lock, flags);
1da177e4	201
61fbfa81	202	if (unlikely(!drv)) {
f88e119c ML	203	osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
f88e119c ML	204	context);
61fbfa81 ML	205	return -EIO;
61fbfa81 ML	206	}
1da177e4	207
9e87545f	208	if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
61fbfa81 ML	209	struct i2o_device dev, tmp;
	210	struct i2o_event *evt;
	211	u16 size;
9e87545f	212	u16 tid = le32_to_cpu(msg->u.head[1]) & 0xfff;
1da177e4	213
61fbfa81	214	osm_debug("event received from device %d\n", tid);
1da177e4	215
f88e119c ML	216	if (!drv->event)
	217	return -EIO;
	218
61fbfa81	219	/* cut of header from message size (in 32-bit words) */
9e87545f	220	size = (le32_to_cpu(msg->u.head[0]) >> 16) - 5;
1da177e4	221
f6ed39a6	222	evt = kzalloc(size * 4 + sizeof(*evt), GFP_ATOMIC);
61fbfa81 ML	223	if (!evt)
61fbfa81 ML	224	return -ENOMEM;
1da177e4	225
61fbfa81	226	evt->size = size;
9e87545f ML	227	evt->tcntxt = le32_to_cpu(msg->u.s.tcntxt);
9e87545f ML	228	evt->event_indicator = le32_to_cpu(msg->body[0]);
dcceafe2	229	memcpy(&evt->data, &msg->body[1], size * 4);
1da177e4	230
61fbfa81 ML	231	list_for_each_entry_safe(dev, tmp, &c->devices, list)
	232	if (dev->lct_data.tid == tid) {
	233	evt->i2o_dev = dev;
	234	break;
1da177e4 LT	235	}
1da177e4 LT	236
c4028958	237	INIT_WORK(&evt->work, drv->event);
61fbfa81 ML	238	queue_work(drv->event_queue, &evt->work);
	239	return 1;
	240	}
	241
	242	if (unlikely(!drv->reply)) {
f88e119c ML	243	osm_debug("%s: Reply to driver %s, but no reply function"
f88e119c ML	244	" defined!\n", c->name, drv->name);
1da177e4	245	return -EIO;
61fbfa81 ML	246	}
	247
	248	return drv->reply(c, m, msg);
1da177e4 LT	249	}
	250
	251	/**
	252	* i2o_driver_notify_controller_add_all - Send notify of added controller
d9489fb6	253	* @c: newly added controller
1da177e4 LT	254	*
	255	* Send notifications to all registered drivers that a new controller was
	256	* added.
	257	*/
	258	void i2o_driver_notify_controller_add_all(struct i2o_controller *c)
	259	{
	260	int i;
	261	struct i2o_driver *drv;
	262
be324797	263	for (i = 0; i < i2o_max_drivers; i++) {
1da177e4 LT	264	drv = i2o_drivers[i];
	265
	266	if (drv)
	267	i2o_driver_notify_controller_add(drv, c);
	268	}
	269	}
	270
	271	/**
d9489fb6 RD	272	* i2o_driver_notify_controller_remove_all - Send notify of removed controller
d9489fb6 RD	273	* @c: controller that is being removed
1da177e4 LT	274	*
	275	* Send notifications to all registered drivers that a controller was
	276	* removed.
	277	*/
	278	void i2o_driver_notify_controller_remove_all(struct i2o_controller *c)
	279	{
	280	int i;
	281	struct i2o_driver *drv;
	282
be324797	283	for (i = 0; i < i2o_max_drivers; i++) {
1da177e4 LT	284	drv = i2o_drivers[i];
	285
	286	if (drv)
	287	i2o_driver_notify_controller_remove(drv, c);
	288	}
	289	}
	290
	291	/**
d9489fb6 RD	292	* i2o_driver_notify_device_add_all - Send notify of added device
d9489fb6 RD	293	* @i2o_dev: newly added I2O device
1da177e4 LT	294	*
	295	* Send notifications to all registered drivers that a device was added.
	296	*/
	297	void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev)
	298	{
	299	int i;
	300	struct i2o_driver *drv;
	301
be324797	302	for (i = 0; i < i2o_max_drivers; i++) {
1da177e4 LT	303	drv = i2o_drivers[i];
	304
	305	if (drv)
	306	i2o_driver_notify_device_add(drv, i2o_dev);
	307	}
	308	}
	309
	310	/**
d9489fb6 RD	311	* i2o_driver_notify_device_remove_all - Send notify of removed device
d9489fb6 RD	312	* @i2o_dev: device that is being removed
1da177e4 LT	313	*
	314	* Send notifications to all registered drivers that a device was removed.
	315	*/
	316	void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev)
	317	{
	318	int i;
	319	struct i2o_driver *drv;
	320
be324797	321	for (i = 0; i < i2o_max_drivers; i++) {
1da177e4 LT	322	drv = i2o_drivers[i];
	323
	324	if (drv)
	325	i2o_driver_notify_device_remove(drv, i2o_dev);
	326	}
	327	}
	328
	329	/**
	330	* i2o_driver_init - initialize I2O drivers (OSMs)
	331	*
	332	* Registers the I2O bus and allocate memory for the array of OSMs.
	333	*
	334	* Returns 0 on success or negative error code on failure.
	335	*/
	336	int __init i2o_driver_init(void)
	337	{
	338	int rc = 0;
	339
	340	spin_lock_init(&i2o_drivers_lock);
	341
82cd0e84 AM	342	if ((i2o_max_drivers < 2) \|\| (i2o_max_drivers > 64)) {
	343	osm_warn("max_drivers set to %d, but must be >=2 and <= 64\n",
	344	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 =
be324797	350	kcalloc(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	*
d9489fb6	365	* Unregisters the I2O bus and frees driver array.
1da177e4	366	*/
d7843724	367	void i2o_driver_exit(void)
1da177e4 LT	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);