[mirror_ubuntu-artful-kernel.git] / drivers / mcb / mcb-core.c

/*
 * MEN Chameleon Bus.
 *
 * Copyright (C) 2013 MEN Mikroelektronik GmbH (www.men.de)
 * Author: Johannes Thumshirn <johannes.thumshirn@men.de>
 *
 * 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; version 2 of the License.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/idr.h>
#include <linux/mcb.h>

static DEFINE_IDA(mcb_ida);

static const struct mcb_device_id *mcb_match_id(const struct mcb_device_id *ids,
						struct mcb_device *dev)
{
	if (ids) {
		while (ids->device) {
			if (ids->device == dev->id)
				return ids;
			ids++;
		}
	}

	return NULL;
}

static int mcb_match(struct device *dev, struct device_driver *drv)
{
	struct mcb_driver *mdrv = to_mcb_driver(drv);
	struct mcb_device *mdev = to_mcb_device(dev);
	const struct mcb_device_id *found_id;

	found_id = mcb_match_id(mdrv->id_table, mdev);
	if (found_id)
		return 1;

	return 0;
}

static int mcb_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct mcb_device *mdev = to_mcb_device(dev);
	int ret;

	ret = add_uevent_var(env, "MODALIAS=mcb:16z%03d", mdev->id);
	if (ret)
		return -ENOMEM;

	return 0;
}

static int mcb_probe(struct device *dev)
{
	struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
	struct mcb_device *mdev = to_mcb_device(dev);
	const struct mcb_device_id *found_id;

	found_id = mcb_match_id(mdrv->id_table, mdev);
	if (!found_id)
		return -ENODEV;

	return mdrv->probe(mdev, found_id);
}

static int mcb_remove(struct device *dev)
{
	struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
	struct mcb_device *mdev = to_mcb_device(dev);

	mdrv->remove(mdev);

	put_device(&mdev->dev);

	return 0;
}

static void mcb_shutdown(struct device *dev)
{
	struct mcb_device *mdev = to_mcb_device(dev);
	struct mcb_driver *mdrv = mdev->driver;

	if (mdrv && mdrv->shutdown)
		mdrv->shutdown(mdev);
}

static struct bus_type mcb_bus_type = {
	.name = "mcb",
	.match = mcb_match,
	.uevent = mcb_uevent,
	.probe = mcb_probe,
	.remove = mcb_remove,
	.shutdown = mcb_shutdown,
};

/**
 * __mcb_register_driver() - Register a @mcb_driver at the system
 * @drv: The @mcb_driver
 * @owner: The @mcb_driver's module
 * @mod_name: The name of the @mcb_driver's module
 *
 * Register a @mcb_driver at the system. Perform some sanity checks, if
 * the .probe and .remove methods are provided by the driver.
 */
int __mcb_register_driver(struct mcb_driver *drv, struct module *owner,
			const char *mod_name)
{
	if (!drv->probe || !drv->remove)
		return -EINVAL;

	drv->driver.owner = owner;
	drv->driver.bus = &mcb_bus_type;
	drv->driver.mod_name = mod_name;

	return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(__mcb_register_driver);

/**
 * mcb_unregister_driver() - Unregister a @mcb_driver from the system
 * @drv: The @mcb_driver
 *
 * Unregister a @mcb_driver from the system.
 */
void mcb_unregister_driver(struct mcb_driver *drv)
{
	driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(mcb_unregister_driver);

static void mcb_release_dev(struct device *dev)
{
	struct mcb_device *mdev = to_mcb_device(dev);

	mcb_bus_put(mdev->bus);
	kfree(mdev);
}

/**
 * mcb_device_register() - Register a mcb_device
 * @bus: The @mcb_bus of the device
 * @dev: The @mcb_device
 *
 * Register a specific @mcb_device at a @mcb_bus and the system itself.
 */
int mcb_device_register(struct mcb_bus *bus, struct mcb_device *dev)
{
	int ret;
	int device_id;

	device_initialize(&dev->dev);
	dev->dev.bus = &mcb_bus_type;
	dev->dev.parent = bus->dev.parent;
	dev->dev.release = mcb_release_dev;

	device_id = dev->id;
	dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d",
		bus->bus_nr, device_id, dev->inst, dev->group, dev->var);

	ret = device_add(&dev->dev);
	if (ret < 0) {
		pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n",
			device_id, bus->bus_nr, ret);
		goto out;
	}

	return 0;

out:

	return ret;
}
EXPORT_SYMBOL_GPL(mcb_device_register);

/**
 * mcb_alloc_bus() - Allocate a new @mcb_bus
 *
 * Allocate a new @mcb_bus.
 */
struct mcb_bus *mcb_alloc_bus(struct device *carrier)
{
	struct mcb_bus *bus;
	int bus_nr;
	int rc;

	bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
	if (!bus)
		return ERR_PTR(-ENOMEM);

	bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
	if (bus_nr < 0) {
		rc = bus_nr;
		goto err_free;
	}

	bus->bus_nr = bus_nr;
	bus->carrier = carrier;

	device_initialize(&bus->dev);
	bus->dev.parent = carrier;
	bus->dev.bus = &mcb_bus_type;

	dev_set_name(&bus->dev, "mcb:%d", bus_nr);
	rc = device_add(&bus->dev);
	if (rc)
		goto err_free;

	return bus;
err_free:
	kfree(bus);
	return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(mcb_alloc_bus);

static int __mcb_devices_unregister(struct device *dev, void *data)
{
	device_unregister(dev);
	return 0;
}

static void mcb_devices_unregister(struct mcb_bus *bus)
{
	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister);
}
/**
 * mcb_release_bus() - Free a @mcb_bus
 * @bus: The @mcb_bus to release
 *
 * Release an allocated @mcb_bus from the system.
 */
void mcb_release_bus(struct mcb_bus *bus)
{
	mcb_devices_unregister(bus);

	ida_simple_remove(&mcb_ida, bus->bus_nr);

	kfree(bus);
}
EXPORT_SYMBOL_GPL(mcb_release_bus);

/**
 * mcb_bus_put() - Increment refcnt
 * @bus: The @mcb_bus
 *
 * Get a @mcb_bus' ref
 */
struct mcb_bus *mcb_bus_get(struct mcb_bus *bus)
{
	if (bus)
		get_device(&bus->dev);

	return bus;
}
EXPORT_SYMBOL_GPL(mcb_bus_get);

/**
 * mcb_bus_put() - Decrement refcnt
 * @bus: The @mcb_bus
 *
 * Release a @mcb_bus' ref
 */
void mcb_bus_put(struct mcb_bus *bus)
{
	if (bus)
		put_device(&bus->dev);
}
EXPORT_SYMBOL_GPL(mcb_bus_put);

/**
 * mcb_alloc_dev() - Allocate a device
 * @bus: The @mcb_bus the device is part of
 *
 * Allocate a @mcb_device and add bus.
 */
struct mcb_device *mcb_alloc_dev(struct mcb_bus *bus)
{
	struct mcb_device *dev;

	dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL);
	if (!dev)
		return NULL;

	INIT_LIST_HEAD(&dev->bus_list);
	dev->bus = bus;

	return dev;
}
EXPORT_SYMBOL_GPL(mcb_alloc_dev);

/**
 * mcb_free_dev() - Free @mcb_device
 * @dev: The device to free
 *
 * Free a @mcb_device
 */
void mcb_free_dev(struct mcb_device *dev)
{
	kfree(dev);
}
EXPORT_SYMBOL_GPL(mcb_free_dev);

static int __mcb_bus_add_devices(struct device *dev, void *data)
{
	struct mcb_device *mdev = to_mcb_device(dev);
	int retval;

	if (mdev->is_added)
		return 0;

	retval = device_attach(dev);
	if (retval < 0)
		dev_err(dev, "Error adding device (%d)\n", retval);

	mdev->is_added = true;

	return 0;
}

static int __mcb_bus_add_child(struct device *dev, void *data)
{
	struct mcb_device *mdev = to_mcb_device(dev);
	struct mcb_bus *child;

	BUG_ON(!mdev->is_added);
	child = mdev->subordinate;

	if (child)
		mcb_bus_add_devices(child);

	return 0;
}

/**
 * mcb_bus_add_devices() - Add devices in the bus' internal device list
 * @bus: The @mcb_bus we add the devices
 *
 * Add devices in the bus' internal device list to the system.
 */
void mcb_bus_add_devices(const struct mcb_bus *bus)
{
	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices);
	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_child);

}
EXPORT_SYMBOL_GPL(mcb_bus_add_devices);

/**
 * mcb_request_mem() - Request memory
 * @dev: The @mcb_device the memory is for
 * @name: The name for the memory reference.
 *
 * Request memory for a @mcb_device. If @name is NULL the driver name will
 * be used.
 */
struct resource *mcb_request_mem(struct mcb_device *dev, const char *name)
{
	struct resource *mem;
	u32 size;

	if (!name)
		name = dev->dev.driver->name;

	size = resource_size(&dev->mem);

	mem = request_mem_region(dev->mem.start, size, name);
	if (!mem)
		return ERR_PTR(-EBUSY);

	return mem;
}
EXPORT_SYMBOL_GPL(mcb_request_mem);

/**
 * mcb_release_mem() - Release memory requested by device
 * @dev: The @mcb_device that requested the memory
 *
 * Release memory that was prior requested via @mcb_request_mem().
 */
void mcb_release_mem(struct resource *mem)
{
	u32 size;

	size = resource_size(mem);
	release_mem_region(mem->start, size);
}
EXPORT_SYMBOL_GPL(mcb_release_mem);

static int __mcb_get_irq(struct mcb_device *dev)
{
	struct resource *irq = &dev->irq;

	return irq->start;
}

/**
 * mcb_get_irq() - Get device's IRQ number
 * @dev: The @mcb_device the IRQ is for
 *
 * Get the IRQ number of a given @mcb_device.
 */
int mcb_get_irq(struct mcb_device *dev)
{
	struct mcb_bus *bus = dev->bus;

	if (bus->get_irq)
		return bus->get_irq(dev);

	return __mcb_get_irq(dev);
}
EXPORT_SYMBOL_GPL(mcb_get_irq);

static int mcb_init(void)
{
	return bus_register(&mcb_bus_type);
}

static void mcb_exit(void)
{
	ida_destroy(&mcb_ida);
	bus_unregister(&mcb_bus_type);
}

/* mcb must be initialized after PCI but before the chameleon drivers.
 * That means we must use some initcall between subsys_initcall and
 * device_initcall.
 */
fs_initcall(mcb_init);
module_exit(mcb_exit);

MODULE_DESCRIPTION("MEN Chameleon Bus Driver");
MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
3764e82e JT	1	/*
	2	* MEN Chameleon Bus.
	3	*
	4	* Copyright (C) 2013 MEN Mikroelektronik GmbH (www.men.de)
	5	* Author: Johannes Thumshirn <johannes.thumshirn@men.de>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the Free
	9	* Software Foundation; version 2 of the License.
	10	*/
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/slab.h>
	14	#include <linux/types.h>
	15	#include <linux/idr.h>
	16	#include <linux/mcb.h>
	17
	18	static DEFINE_IDA(mcb_ida);
	19
	20	static const struct mcb_device_id mcb_match_id(const struct mcb_device_id ids,
	21	struct mcb_device *dev)
	22	{
	23	if (ids) {
	24	while (ids->device) {
	25	if (ids->device == dev->id)
	26	return ids;
	27	ids++;
	28	}
	29	}
	30
	31	return NULL;
	32	}
	33
	34	static int mcb_match(struct device dev, struct device_driver drv)
	35	{
	36	struct mcb_driver *mdrv = to_mcb_driver(drv);
	37	struct mcb_device *mdev = to_mcb_device(dev);
	38	const struct mcb_device_id *found_id;
	39
	40	found_id = mcb_match_id(mdrv->id_table, mdev);
	41	if (found_id)
	42	return 1;
	43
	44	return 0;
	45	}
	46
	47	static int mcb_uevent(struct device dev, struct kobj_uevent_env env)
	48	{
	49	struct mcb_device *mdev = to_mcb_device(dev);
	50	int ret;
	51
	52	ret = add_uevent_var(env, "MODALIAS=mcb:16z%03d", mdev->id);
	53	if (ret)
	54	return -ENOMEM;
	55
	56	return 0;
	57	}
	58
	59	static int mcb_probe(struct device *dev)
	60	{
	61	struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
	62	struct mcb_device *mdev = to_mcb_device(dev);
	63	const struct mcb_device_id *found_id;
	64
65	found_id = mcb_match_id(mdrv->id_table, mdev);
66	if (!found_id)
67	return -ENODEV;
68
69	return mdrv->probe(mdev, found_id);
70	}
71
72	static int mcb_remove(struct device *dev)
73	{
74	struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
75	struct mcb_device *mdev = to_mcb_device(dev);
76
77	mdrv->remove(mdev);
78
79	put_device(&mdev->dev);
80
81	return 0;
82	}
83
84	static void mcb_shutdown(struct device *dev)
85	{
86	struct mcb_device *mdev = to_mcb_device(dev);
87	struct mcb_driver *mdrv = mdev->driver;
88
89	if (mdrv && mdrv->shutdown)
90	mdrv->shutdown(mdev);
91	}
92
93	static struct bus_type mcb_bus_type = {
94	.name = "mcb",
95	.match = mcb_match,
96	.uevent = mcb_uevent,
97	.probe = mcb_probe,
98	.remove = mcb_remove,
99	.shutdown = mcb_shutdown,
100	};
101
102	/**
103	* __mcb_register_driver() - Register a @mcb_driver at the system
104	* @drv: The @mcb_driver
105	* @owner: The @mcb_driver's module
106	* @mod_name: The name of the @mcb_driver's module
107	*
108	* Register a @mcb_driver at the system. Perform some sanity checks, if
109	* the .probe and .remove methods are provided by the driver.
110	*/
111	int __mcb_register_driver(struct mcb_driver drv, struct module owner,
112	const char *mod_name)
113	{
114	if (!drv->probe \|\| !drv->remove)
115	return -EINVAL;
116
117	drv->driver.owner = owner;
118	drv->driver.bus = &mcb_bus_type;
119	drv->driver.mod_name = mod_name;
120
121	return driver_register(&drv->driver);
122	}
123	EXPORT_SYMBOL_GPL(__mcb_register_driver);
124
125	/**
126	* mcb_unregister_driver() - Unregister a @mcb_driver from the system
127	* @drv: The @mcb_driver
128	*
129	* Unregister a @mcb_driver from the system.
130	*/
131	void mcb_unregister_driver(struct mcb_driver *drv)
132	{
133	driver_unregister(&drv->driver);
134	}
135	EXPORT_SYMBOL_GPL(mcb_unregister_driver);
136
137	static void mcb_release_dev(struct device *dev)
138	{
139	struct mcb_device *mdev = to_mcb_device(dev);
140
141	mcb_bus_put(mdev->bus);
142	kfree(mdev);
143	}
144
145	/**
146	* mcb_device_register() - Register a mcb_device
147	* @bus: The @mcb_bus of the device
148	* @dev: The @mcb_device
149	*
150	* Register a specific @mcb_device at a @mcb_bus and the system itself.
151	*/
152	int mcb_device_register(struct mcb_bus bus, struct mcb_device dev)
153	{
154	int ret;
155	int device_id;
156
157	device_initialize(&dev->dev);
158	dev->dev.bus = &mcb_bus_type;
159	dev->dev.parent = bus->dev.parent;
160	dev->dev.release = mcb_release_dev;
161
162	device_id = dev->id;
163	dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d",
164	bus->bus_nr, device_id, dev->inst, dev->group, dev->var);
165
166	ret = device_add(&dev->dev);
167	if (ret < 0) {
168	pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n",
169	device_id, bus->bus_nr, ret);
170	goto out;
171	}
172
173	return 0;
174
175	out:
176
177	return ret;
178	}
179	EXPORT_SYMBOL_GPL(mcb_device_register);
180
181	/**
182	* mcb_alloc_bus() - Allocate a new @mcb_bus
183	*
184	* Allocate a new @mcb_bus.
185	*/
4ec65b77	186	struct mcb_bus mcb_alloc_bus(struct device carrier)
3764e82e JT	187	{
	188	struct mcb_bus *bus;
	189	int bus_nr;
18d28819	190	int rc;
3764e82e JT	191
	192	bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
	193	if (!bus)
4ec65b77	194	return ERR_PTR(-ENOMEM);
3764e82e JT	195
	196	bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
	197	if (bus_nr < 0) {
18d28819 JT	198	rc = bus_nr;
18d28819 JT	199	goto err_free;
3764e82e JT	200	}
3764e82e JT	201
3764e82e	202	bus->bus_nr = bus_nr;
4ec65b77	203	bus->carrier = carrier;
18d28819 JT	204
	205	device_initialize(&bus->dev);
	206	bus->dev.parent = carrier;
	207	bus->dev.bus = &mcb_bus_type;
	208
	209	dev_set_name(&bus->dev, "mcb:%d", bus_nr);
	210	rc = device_add(&bus->dev);
	211	if (rc)
	212	goto err_free;
	213
3764e82e	214	return bus;
18d28819 JT	215	err_free:
	216	kfree(bus);
	217	return ERR_PTR(rc);
3764e82e JT	218	}
	219	EXPORT_SYMBOL_GPL(mcb_alloc_bus);
	220
	221	static int __mcb_devices_unregister(struct device dev, void data)
	222	{
	223	device_unregister(dev);
	224	return 0;
	225	}
	226
	227	static void mcb_devices_unregister(struct mcb_bus *bus)
	228	{
	229	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister);
	230	}
	231	/**
	232	* mcb_release_bus() - Free a @mcb_bus
	233	* @bus: The @mcb_bus to release
	234	*
	235	* Release an allocated @mcb_bus from the system.
	236	*/
	237	void mcb_release_bus(struct mcb_bus *bus)
	238	{
	239	mcb_devices_unregister(bus);
	240
	241	ida_simple_remove(&mcb_ida, bus->bus_nr);
	242
	243	kfree(bus);
	244	}
	245	EXPORT_SYMBOL_GPL(mcb_release_bus);
	246
	247	/**
	248	* mcb_bus_put() - Increment refcnt
	249	* @bus: The @mcb_bus
	250	*
	251	* Get a @mcb_bus' ref
	252	*/
	253	struct mcb_bus mcb_bus_get(struct mcb_bus bus)
	254	{
	255	if (bus)
	256	get_device(&bus->dev);
	257
	258	return bus;
	259	}
	260	EXPORT_SYMBOL_GPL(mcb_bus_get);
	261
	262	/**
	263	* mcb_bus_put() - Decrement refcnt
	264	* @bus: The @mcb_bus
	265	*
	266	* Release a @mcb_bus' ref
	267	*/
	268	void mcb_bus_put(struct mcb_bus *bus)
	269	{
	270	if (bus)
	271	put_device(&bus->dev);
	272	}
	273	EXPORT_SYMBOL_GPL(mcb_bus_put);
	274
	275	/**
	276	* mcb_alloc_dev() - Allocate a device
	277	* @bus: The @mcb_bus the device is part of
	278	*
	279	* Allocate a @mcb_device and add bus.
	280	*/
	281	struct mcb_device mcb_alloc_dev(struct mcb_bus bus)
282	{
283	struct mcb_device *dev;
284
285	dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL);
286	if (!dev)
287	return NULL;
288
289	INIT_LIST_HEAD(&dev->bus_list);
290	dev->bus = bus;
291
292	return dev;
293	}
294	EXPORT_SYMBOL_GPL(mcb_alloc_dev);
295
296	/**
297	* mcb_free_dev() - Free @mcb_device
298	* @dev: The device to free
299	*
300	* Free a @mcb_device
301	*/
302	void mcb_free_dev(struct mcb_device *dev)
303	{
304	kfree(dev);
305	}
306	EXPORT_SYMBOL_GPL(mcb_free_dev);
307
308	static int __mcb_bus_add_devices(struct device dev, void data)
309	{
310	struct mcb_device *mdev = to_mcb_device(dev);
311	int retval;
312
313	if (mdev->is_added)
314	return 0;
315
316	retval = device_attach(dev);
317	if (retval < 0)
318	dev_err(dev, "Error adding device (%d)\n", retval);
319
320	mdev->is_added = true;
321
322	return 0;
323	}
324
325	static int __mcb_bus_add_child(struct device dev, void data)
326	{
327	struct mcb_device *mdev = to_mcb_device(dev);
328	struct mcb_bus *child;
329
330	BUG_ON(!mdev->is_added);
331	child = mdev->subordinate;
332
333	if (child)
334	mcb_bus_add_devices(child);
335
336	return 0;
337	}
338
339	/**
340	* mcb_bus_add_devices() - Add devices in the bus' internal device list
341	* @bus: The @mcb_bus we add the devices
342	*
343	* Add devices in the bus' internal device list to the system.
344	*/
345	void mcb_bus_add_devices(const struct mcb_bus *bus)
346	{
347	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices);
348	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_child);
349
350	}
351	EXPORT_SYMBOL_GPL(mcb_bus_add_devices);
352
353	/**
354	* mcb_request_mem() - Request memory
355	* @dev: The @mcb_device the memory is for
356	* @name: The name for the memory reference.
357	*
358	* Request memory for a @mcb_device. If @name is NULL the driver name will
359	* be used.
360	*/
361	struct resource mcb_request_mem(struct mcb_device dev, const char *name)
362	{
363	struct resource *mem;
364	u32 size;
365
366	if (!name)
367	name = dev->dev.driver->name;
368
369	size = resource_size(&dev->mem);
370
371	mem = request_mem_region(dev->mem.start, size, name);
372	if (!mem)
373	return ERR_PTR(-EBUSY);
374
375	return mem;
376	}
377	EXPORT_SYMBOL_GPL(mcb_request_mem);
378
379	/**
380	* mcb_release_mem() - Release memory requested by device
381	* @dev: The @mcb_device that requested the memory
382	*
383	* Release memory that was prior requested via @mcb_request_mem().
384	*/
385	void mcb_release_mem(struct resource *mem)
386	{
387	u32 size;
388
389	size = resource_size(mem);
390	release_mem_region(mem->start, size);
391	}
392	EXPORT_SYMBOL_GPL(mcb_release_mem);
393
4ec65b77 JT	394	static int __mcb_get_irq(struct mcb_device *dev)
	395	{
	396	struct resource *irq = &dev->irq;
	397
	398	return irq->start;
	399	}
	400
3764e82e JT	401	/**
	402	* mcb_get_irq() - Get device's IRQ number
	403	* @dev: The @mcb_device the IRQ is for
	404	*
	405	* Get the IRQ number of a given @mcb_device.
	406	*/
	407	int mcb_get_irq(struct mcb_device *dev)
	408	{
4ec65b77	409	struct mcb_bus *bus = dev->bus;
3764e82e	410
4ec65b77 JT	411	if (bus->get_irq)
	412	return bus->get_irq(dev);
	413
	414	return __mcb_get_irq(dev);
3764e82e JT	415	}
	416	EXPORT_SYMBOL_GPL(mcb_get_irq);
	417
	418	static int mcb_init(void)
	419	{
	420	return bus_register(&mcb_bus_type);
	421	}
	422
	423	static void mcb_exit(void)
	424	{
169883a6	425	ida_destroy(&mcb_ida);
3764e82e JT	426	bus_unregister(&mcb_bus_type);
	427	}
	428
	429	/* mcb must be initialized after PCI but before the chameleon drivers.
	430	* That means we must use some initcall between subsys_initcall and
	431	* device_initcall.
	432	*/
	433	fs_initcall(mcb_init);
	434	module_exit(mcb_exit);
	435
	436	MODULE_DESCRIPTION("MEN Chameleon Bus Driver");
	437	MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
	438	MODULE_LICENSE("GPL v2");