[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;

	get_device(dev);
	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_driver *mdrv = to_mcb_driver(dev->driver);
	struct mcb_device *mdev = to_mcb_device(dev);

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

static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct mcb_bus *bus = to_mcb_bus(dev);

	return scnprintf(buf, PAGE_SIZE, "%d\n", bus->revision);
}
static DEVICE_ATTR_RO(revision);

static ssize_t model_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct mcb_bus *bus = to_mcb_bus(dev);

	return scnprintf(buf, PAGE_SIZE, "%c\n", bus->model);
}
static DEVICE_ATTR_RO(model);

static ssize_t minor_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct mcb_bus *bus = to_mcb_bus(dev);

	return scnprintf(buf, PAGE_SIZE, "%d\n", bus->minor);
}
static DEVICE_ATTR_RO(minor);

static ssize_t name_show(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct mcb_bus *bus = to_mcb_bus(dev);

	return scnprintf(buf, PAGE_SIZE, "%s\n", bus->name);
}
static DEVICE_ATTR_RO(name);

static struct attribute *mcb_bus_attrs[] = {
	&dev_attr_revision.attr,
	&dev_attr_model.attr,
	&dev_attr_minor.attr,
	&dev_attr_name.attr,
	NULL,
};

static const struct attribute_group mcb_carrier_group = {
	.attrs = mcb_bus_attrs,
};

static const struct attribute_group *mcb_carrier_groups[] = {
	&mcb_carrier_group,
	NULL,
};


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

static struct device_type mcb_carrier_device_type = {
	.name = "mcb-carrier",
	.groups = mcb_carrier_groups,
};

/**
 * __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);
	mcb_bus_get(bus);
	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);

static void mcb_free_bus(struct device *dev)
{
	struct mcb_bus *bus = to_mcb_bus(dev);

	put_device(bus->carrier);
	ida_simple_remove(&mcb_ida, bus->bus_nr);
	kfree(bus);
}

/**
 * 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 = get_device(carrier);

	device_initialize(&bus->dev);
	bus->dev.parent = carrier;
	bus->dev.bus = &mcb_bus_type;
	bus->dev.type = &mcb_carrier_device_type;
	bus->dev.release = &mcb_free_bus;

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

	return bus;
err_free:
	put_device(carrier);
	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);
}
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
7bc36409	69	get_device(dev);
3764e82e JT	70	return mdrv->probe(mdev, found_id);
	71	}
	72
	73	static int mcb_remove(struct device *dev)
	74	{
	75	struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
	76	struct mcb_device *mdev = to_mcb_device(dev);
	77
	78	mdrv->remove(mdev);
	79
	80	put_device(&mdev->dev);
	81
	82	return 0;
	83	}
	84
	85	static void mcb_shutdown(struct device *dev)
	86	{
5d9e2ab9	87	struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
3764e82e	88	struct mcb_device *mdev = to_mcb_device(dev);
3764e82e JT	89
	90	if (mdrv && mdrv->shutdown)
	91	mdrv->shutdown(mdev);
	92	}
	93
803f1ca6 JT	94	static ssize_t revision_show(struct device dev, struct device_attribute attr,
	95	char *buf)
	96	{
	97	struct mcb_bus *bus = to_mcb_bus(dev);
	98
	99	return scnprintf(buf, PAGE_SIZE, "%d\n", bus->revision);
	100	}
	101	static DEVICE_ATTR_RO(revision);
	102
	103	static ssize_t model_show(struct device dev, struct device_attribute attr,
	104	char *buf)
	105	{
	106	struct mcb_bus *bus = to_mcb_bus(dev);
	107
	108	return scnprintf(buf, PAGE_SIZE, "%c\n", bus->model);
	109	}
	110	static DEVICE_ATTR_RO(model);
	111
	112	static ssize_t minor_show(struct device dev, struct device_attribute attr,
	113	char *buf)
	114	{
	115	struct mcb_bus *bus = to_mcb_bus(dev);
	116
	117	return scnprintf(buf, PAGE_SIZE, "%d\n", bus->minor);
	118	}
	119	static DEVICE_ATTR_RO(minor);
	120
	121	static ssize_t name_show(struct device dev, struct device_attribute attr,
	122	char *buf)
	123	{
	124	struct mcb_bus *bus = to_mcb_bus(dev);
	125
	126	return scnprintf(buf, PAGE_SIZE, "%s\n", bus->name);
	127	}
	128	static DEVICE_ATTR_RO(name);
	129
	130	static struct attribute *mcb_bus_attrs[] = {
	131	&dev_attr_revision.attr,
	132	&dev_attr_model.attr,
	133	&dev_attr_minor.attr,
	134	&dev_attr_name.attr,
	135	NULL,
	136	};
	137
	138	static const struct attribute_group mcb_carrier_group = {
	139	.attrs = mcb_bus_attrs,
	140	};
	141
	142	static const struct attribute_group *mcb_carrier_groups[] = {
	143	&mcb_carrier_group,
	144	NULL,
	145	};
	146
	147
3764e82e JT	148	static struct bus_type mcb_bus_type = {
	149	.name = "mcb",
	150	.match = mcb_match,
	151	.uevent = mcb_uevent,
	152	.probe = mcb_probe,
	153	.remove = mcb_remove,
	154	.shutdown = mcb_shutdown,
	155	};
	156
803f1ca6 JT	157	static struct device_type mcb_carrier_device_type = {
	158	.name = "mcb-carrier",
	159	.groups = mcb_carrier_groups,
	160	};
	161
3764e82e JT	162	/**
	163	* __mcb_register_driver() - Register a @mcb_driver at the system
	164	* @drv: The @mcb_driver
	165	* @owner: The @mcb_driver's module
	166	* @mod_name: The name of the @mcb_driver's module
	167	*
	168	* Register a @mcb_driver at the system. Perform some sanity checks, if
	169	* the .probe and .remove methods are provided by the driver.
	170	*/
	171	int __mcb_register_driver(struct mcb_driver drv, struct module owner,
	172	const char *mod_name)
	173	{
	174	if (!drv->probe \|\| !drv->remove)
	175	return -EINVAL;
	176
	177	drv->driver.owner = owner;
	178	drv->driver.bus = &mcb_bus_type;
	179	drv->driver.mod_name = mod_name;
	180
	181	return driver_register(&drv->driver);
	182	}
	183	EXPORT_SYMBOL_GPL(__mcb_register_driver);
	184
	185	/**
	186	* mcb_unregister_driver() - Unregister a @mcb_driver from the system
	187	* @drv: The @mcb_driver
	188	*
	189	* Unregister a @mcb_driver from the system.
	190	*/
	191	void mcb_unregister_driver(struct mcb_driver *drv)
	192	{
	193	driver_unregister(&drv->driver);
	194	}
	195	EXPORT_SYMBOL_GPL(mcb_unregister_driver);
	196
	197	static void mcb_release_dev(struct device *dev)
	198	{
	199	struct mcb_device *mdev = to_mcb_device(dev);
	200
	201	mcb_bus_put(mdev->bus);
	202	kfree(mdev);
	203	}
	204
	205	/**
	206	* mcb_device_register() - Register a mcb_device
	207	* @bus: The @mcb_bus of the device
	208	* @dev: The @mcb_device
	209	*
	210	* Register a specific @mcb_device at a @mcb_bus and the system itself.
	211	*/
	212	int mcb_device_register(struct mcb_bus bus, struct mcb_device dev)
	213	{
	214	int ret;
	215	int device_id;
	216
	217	device_initialize(&dev->dev);
5d9e2ab9	218	mcb_bus_get(bus);
3764e82e JT	219	dev->dev.bus = &mcb_bus_type;
	220	dev->dev.parent = bus->dev.parent;
	221	dev->dev.release = mcb_release_dev;
	222
	223	device_id = dev->id;
	224	dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d",
	225	bus->bus_nr, device_id, dev->inst, dev->group, dev->var);
	226
	227	ret = device_add(&dev->dev);
	228	if (ret < 0) {
	229	pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n",
	230	device_id, bus->bus_nr, ret);
	231	goto out;
	232	}
	233
	234	return 0;
	235
	236	out:
	237
	238	return ret;
	239	}
	240	EXPORT_SYMBOL_GPL(mcb_device_register);
	241
5d9e2ab9 JT	242	static void mcb_free_bus(struct device *dev)
	243	{
	244	struct mcb_bus *bus = to_mcb_bus(dev);
	245
	246	put_device(bus->carrier);
	247	ida_simple_remove(&mcb_ida, bus->bus_nr);
	248	kfree(bus);
	249	}
	250
3764e82e JT	251	/**
	252	* mcb_alloc_bus() - Allocate a new @mcb_bus
	253	*
	254	* Allocate a new @mcb_bus.
	255	*/
4ec65b77	256	struct mcb_bus mcb_alloc_bus(struct device carrier)
3764e82e JT	257	{
	258	struct mcb_bus *bus;
	259	int bus_nr;
18d28819	260	int rc;
3764e82e JT	261
	262	bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
	263	if (!bus)
4ec65b77	264	return ERR_PTR(-ENOMEM);
3764e82e JT	265
	266	bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
	267	if (bus_nr < 0) {
18d28819 JT	268	rc = bus_nr;
18d28819 JT	269	goto err_free;
3764e82e JT	270	}
3764e82e JT	271
3764e82e	272	bus->bus_nr = bus_nr;
5d9e2ab9	273	bus->carrier = get_device(carrier);
18d28819 JT	274
	275	device_initialize(&bus->dev);
	276	bus->dev.parent = carrier;
	277	bus->dev.bus = &mcb_bus_type;
803f1ca6	278	bus->dev.type = &mcb_carrier_device_type;
5d9e2ab9	279	bus->dev.release = &mcb_free_bus;
18d28819 JT	280
	281	dev_set_name(&bus->dev, "mcb:%d", bus_nr);
	282	rc = device_add(&bus->dev);
	283	if (rc)
	284	goto err_free;
	285
3764e82e	286	return bus;
18d28819	287	err_free:
5d9e2ab9	288	put_device(carrier);
18d28819 JT	289	kfree(bus);
18d28819 JT	290	return ERR_PTR(rc);
3764e82e JT	291	}
	292	EXPORT_SYMBOL_GPL(mcb_alloc_bus);
	293
	294	static int __mcb_devices_unregister(struct device dev, void data)
	295	{
	296	device_unregister(dev);
	297	return 0;
	298	}
	299
	300	static void mcb_devices_unregister(struct mcb_bus *bus)
	301	{
	302	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister);
	303	}
	304	/**
	305	* mcb_release_bus() - Free a @mcb_bus
	306	* @bus: The @mcb_bus to release
	307	*
	308	* Release an allocated @mcb_bus from the system.
	309	*/
	310	void mcb_release_bus(struct mcb_bus *bus)
	311	{
	312	mcb_devices_unregister(bus);
3764e82e JT	313	}
	314	EXPORT_SYMBOL_GPL(mcb_release_bus);
	315
	316	/**
	317	* mcb_bus_put() - Increment refcnt
	318	* @bus: The @mcb_bus
	319	*
	320	* Get a @mcb_bus' ref
	321	*/
	322	struct mcb_bus mcb_bus_get(struct mcb_bus bus)
	323	{
	324	if (bus)
	325	get_device(&bus->dev);
	326
	327	return bus;
	328	}
	329	EXPORT_SYMBOL_GPL(mcb_bus_get);
	330
	331	/**
	332	* mcb_bus_put() - Decrement refcnt
	333	* @bus: The @mcb_bus
	334	*
	335	* Release a @mcb_bus' ref
	336	*/
	337	void mcb_bus_put(struct mcb_bus *bus)
	338	{
	339	if (bus)
	340	put_device(&bus->dev);
	341	}
	342	EXPORT_SYMBOL_GPL(mcb_bus_put);
	343
	344	/**
	345	* mcb_alloc_dev() - Allocate a device
	346	* @bus: The @mcb_bus the device is part of
	347	*
	348	* Allocate a @mcb_device and add bus.
	349	*/
	350	struct mcb_device mcb_alloc_dev(struct mcb_bus bus)
	351	{
	352	struct mcb_device *dev;
	353
	354	dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL);
	355	if (!dev)
	356	return NULL;
	357
	358	INIT_LIST_HEAD(&dev->bus_list);
	359	dev->bus = bus;
	360
	361	return dev;
	362	}
	363	EXPORT_SYMBOL_GPL(mcb_alloc_dev);
	364
	365	/**
	366	* mcb_free_dev() - Free @mcb_device
	367	* @dev: The device to free
	368	*
	369	* Free a @mcb_device
	370	*/
	371	void mcb_free_dev(struct mcb_device *dev)
	372	{
	373	kfree(dev);
	374	}
	375	EXPORT_SYMBOL_GPL(mcb_free_dev);
	376
377	static int __mcb_bus_add_devices(struct device dev, void data)
378	{
379	struct mcb_device *mdev = to_mcb_device(dev);
380	int retval;
381
382	if (mdev->is_added)
383	return 0;
384
385	retval = device_attach(dev);
386	if (retval < 0)
387	dev_err(dev, "Error adding device (%d)\n", retval);
388
389	mdev->is_added = true;
390
391	return 0;
392	}
393
394	static int __mcb_bus_add_child(struct device dev, void data)
395	{
396	struct mcb_device *mdev = to_mcb_device(dev);
397	struct mcb_bus *child;
398
399	BUG_ON(!mdev->is_added);
400	child = mdev->subordinate;
401
402	if (child)
403	mcb_bus_add_devices(child);
404
405	return 0;
406	}
407
408	/**
409	* mcb_bus_add_devices() - Add devices in the bus' internal device list
410	* @bus: The @mcb_bus we add the devices
411	*
412	* Add devices in the bus' internal device list to the system.
413	*/
414	void mcb_bus_add_devices(const struct mcb_bus *bus)
415	{
416	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices);
417	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_child);
418
419	}
420	EXPORT_SYMBOL_GPL(mcb_bus_add_devices);
421
422	/**
423	* mcb_request_mem() - Request memory
424	* @dev: The @mcb_device the memory is for
425	* @name: The name for the memory reference.
426	*
427	* Request memory for a @mcb_device. If @name is NULL the driver name will
428	* be used.
429	*/
430	struct resource mcb_request_mem(struct mcb_device dev, const char *name)
431	{
432	struct resource *mem;
433	u32 size;
434
435	if (!name)
436	name = dev->dev.driver->name;
437
438	size = resource_size(&dev->mem);
439
440	mem = request_mem_region(dev->mem.start, size, name);
441	if (!mem)
442	return ERR_PTR(-EBUSY);
443
444	return mem;
445	}
446	EXPORT_SYMBOL_GPL(mcb_request_mem);
447
448	/**
449	* mcb_release_mem() - Release memory requested by device
450	* @dev: The @mcb_device that requested the memory
451	*
452	* Release memory that was prior requested via @mcb_request_mem().
453	*/
454	void mcb_release_mem(struct resource *mem)
455	{
456	u32 size;
457
458	size = resource_size(mem);
459	release_mem_region(mem->start, size);
460	}
461	EXPORT_SYMBOL_GPL(mcb_release_mem);
462
4ec65b77 JT	463	static int __mcb_get_irq(struct mcb_device *dev)
	464	{
	465	struct resource *irq = &dev->irq;
	466
	467	return irq->start;
	468	}
	469
3764e82e JT	470	/**
	471	* mcb_get_irq() - Get device's IRQ number
	472	* @dev: The @mcb_device the IRQ is for
	473	*
	474	* Get the IRQ number of a given @mcb_device.
	475	*/
	476	int mcb_get_irq(struct mcb_device *dev)
	477	{
4ec65b77	478	struct mcb_bus *bus = dev->bus;
3764e82e	479
4ec65b77 JT	480	if (bus->get_irq)
	481	return bus->get_irq(dev);
	482
	483	return __mcb_get_irq(dev);
3764e82e JT	484	}
	485	EXPORT_SYMBOL_GPL(mcb_get_irq);
	486
	487	static int mcb_init(void)
	488	{
	489	return bus_register(&mcb_bus_type);
	490	}
	491
	492	static void mcb_exit(void)
	493	{
169883a6	494	ida_destroy(&mcb_ida);
3764e82e JT	495	bus_unregister(&mcb_bus_type);
	496	}
	497
	498	/* mcb must be initialized after PCI but before the chameleon drivers.
	499	* That means we must use some initcall between subsys_initcall and
	500	* device_initcall.
	501	*/
	502	fs_initcall(mcb_init);
	503	module_exit(mcb_exit);
	504
	505	MODULE_DESCRIPTION("MEN Chameleon Bus Driver");
	506	MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
	507	MODULE_LICENSE("GPL v2");