[deliverable/linux.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;
	struct module *carrier_mod;
	int ret;

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

	carrier_mod = mdev->dev.parent->driver->owner;
	if (!try_module_get(carrier_mod))
		return -EINVAL;

	get_device(dev);
	ret = mdrv->probe(mdev, found_id);
	if (ret)
		module_put(carrier_mod);

	return ret;
}

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

	mdrv->remove(mdev);

	carrier_mod = mdev->dev.parent->driver->owner;
	module_put(carrier_mod);

	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;

	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;
}

/**
 * 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);
}
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;
4d2ec857 JT	64	struct module *carrier_mod;
4d2ec857 JT	65	int ret;
3764e82e JT	66
	67	found_id = mcb_match_id(mdrv->id_table, mdev);
	68	if (!found_id)
	69	return -ENODEV;
	70
4d2ec857 JT	71	carrier_mod = mdev->dev.parent->driver->owner;
	72	if (!try_module_get(carrier_mod))
	73	return -EINVAL;
	74
7bc36409	75	get_device(dev);
4d2ec857 JT	76	ret = mdrv->probe(mdev, found_id);
	77	if (ret)
	78	module_put(carrier_mod);
	79
	80	return ret;
3764e82e JT	81	}
	82
	83	static int mcb_remove(struct device *dev)
	84	{
	85	struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
	86	struct mcb_device *mdev = to_mcb_device(dev);
4d2ec857	87	struct module *carrier_mod;
3764e82e JT	88
	89	mdrv->remove(mdev);
	90
4d2ec857 JT	91	carrier_mod = mdev->dev.parent->driver->owner;
	92	module_put(carrier_mod);
	93
3764e82e JT	94	put_device(&mdev->dev);
	95
	96	return 0;
	97	}
	98
	99	static void mcb_shutdown(struct device *dev)
	100	{
5d9e2ab9	101	struct mcb_driver *mdrv = to_mcb_driver(dev->driver);
3764e82e	102	struct mcb_device *mdev = to_mcb_device(dev);
3764e82e JT	103
	104	if (mdrv && mdrv->shutdown)
	105	mdrv->shutdown(mdev);
	106	}
	107
803f1ca6 JT	108	static ssize_t revision_show(struct device dev, struct device_attribute attr,
	109	char *buf)
	110	{
	111	struct mcb_bus *bus = to_mcb_bus(dev);
	112
	113	return scnprintf(buf, PAGE_SIZE, "%d\n", bus->revision);
	114	}
	115	static DEVICE_ATTR_RO(revision);
	116
	117	static ssize_t model_show(struct device dev, struct device_attribute attr,
	118	char *buf)
	119	{
	120	struct mcb_bus *bus = to_mcb_bus(dev);
	121
	122	return scnprintf(buf, PAGE_SIZE, "%c\n", bus->model);
	123	}
	124	static DEVICE_ATTR_RO(model);
	125
	126	static ssize_t minor_show(struct device dev, struct device_attribute attr,
	127	char *buf)
	128	{
	129	struct mcb_bus *bus = to_mcb_bus(dev);
	130
	131	return scnprintf(buf, PAGE_SIZE, "%d\n", bus->minor);
	132	}
	133	static DEVICE_ATTR_RO(minor);
	134
	135	static ssize_t name_show(struct device dev, struct device_attribute attr,
	136	char *buf)
	137	{
	138	struct mcb_bus *bus = to_mcb_bus(dev);
	139
	140	return scnprintf(buf, PAGE_SIZE, "%s\n", bus->name);
	141	}
	142	static DEVICE_ATTR_RO(name);
	143
	144	static struct attribute *mcb_bus_attrs[] = {
	145	&dev_attr_revision.attr,
	146	&dev_attr_model.attr,
	147	&dev_attr_minor.attr,
	148	&dev_attr_name.attr,
	149	NULL,
	150	};
	151
	152	static const struct attribute_group mcb_carrier_group = {
	153	.attrs = mcb_bus_attrs,
	154	};
	155
	156	static const struct attribute_group *mcb_carrier_groups[] = {
	157	&mcb_carrier_group,
	158	NULL,
	159	};
	160
	161
3764e82e JT	162	static struct bus_type mcb_bus_type = {
	163	.name = "mcb",
	164	.match = mcb_match,
	165	.uevent = mcb_uevent,
	166	.probe = mcb_probe,
	167	.remove = mcb_remove,
	168	.shutdown = mcb_shutdown,
	169	};
	170
803f1ca6 JT	171	static struct device_type mcb_carrier_device_type = {
	172	.name = "mcb-carrier",
	173	.groups = mcb_carrier_groups,
	174	};
	175
3764e82e JT	176	/**
	177	* __mcb_register_driver() - Register a @mcb_driver at the system
	178	* @drv: The @mcb_driver
	179	* @owner: The @mcb_driver's module
	180	* @mod_name: The name of the @mcb_driver's module
	181	*
	182	* Register a @mcb_driver at the system. Perform some sanity checks, if
	183	* the .probe and .remove methods are provided by the driver.
	184	*/
	185	int __mcb_register_driver(struct mcb_driver drv, struct module owner,
	186	const char *mod_name)
	187	{
	188	if (!drv->probe \|\| !drv->remove)
	189	return -EINVAL;
	190
	191	drv->driver.owner = owner;
	192	drv->driver.bus = &mcb_bus_type;
	193	drv->driver.mod_name = mod_name;
	194
	195	return driver_register(&drv->driver);
	196	}
	197	EXPORT_SYMBOL_GPL(__mcb_register_driver);
	198
	199	/**
	200	* mcb_unregister_driver() - Unregister a @mcb_driver from the system
	201	* @drv: The @mcb_driver
	202	*
	203	* Unregister a @mcb_driver from the system.
	204	*/
	205	void mcb_unregister_driver(struct mcb_driver *drv)
	206	{
	207	driver_unregister(&drv->driver);
	208	}
	209	EXPORT_SYMBOL_GPL(mcb_unregister_driver);
	210
	211	static void mcb_release_dev(struct device *dev)
	212	{
	213	struct mcb_device *mdev = to_mcb_device(dev);
	214
	215	mcb_bus_put(mdev->bus);
	216	kfree(mdev);
	217	}
	218
	219	/**
	220	* mcb_device_register() - Register a mcb_device
	221	* @bus: The @mcb_bus of the device
	222	* @dev: The @mcb_device
	223	*
	224	* Register a specific @mcb_device at a @mcb_bus and the system itself.
	225	*/
	226	int mcb_device_register(struct mcb_bus bus, struct mcb_device dev)
	227	{
	228	int ret;
	229	int device_id;
	230
	231	device_initialize(&dev->dev);
5d9e2ab9	232	mcb_bus_get(bus);
3764e82e JT	233	dev->dev.bus = &mcb_bus_type;
	234	dev->dev.parent = bus->dev.parent;
	235	dev->dev.release = mcb_release_dev;
	236
	237	device_id = dev->id;
	238	dev_set_name(&dev->dev, "mcb%d-16z%03d-%d:%d:%d",
	239	bus->bus_nr, device_id, dev->inst, dev->group, dev->var);
	240
	241	ret = device_add(&dev->dev);
	242	if (ret < 0) {
	243	pr_err("Failed registering device 16z%03d on bus mcb%d (%d)\n",
	244	device_id, bus->bus_nr, ret);
	245	goto out;
	246	}
	247
	248	return 0;
	249
	250	out:
	251
	252	return ret;
	253	}
	254	EXPORT_SYMBOL_GPL(mcb_device_register);
	255
5d9e2ab9 JT	256	static void mcb_free_bus(struct device *dev)
	257	{
	258	struct mcb_bus *bus = to_mcb_bus(dev);
	259
	260	put_device(bus->carrier);
	261	ida_simple_remove(&mcb_ida, bus->bus_nr);
	262	kfree(bus);
	263	}
	264
3764e82e JT	265	/**
	266	* mcb_alloc_bus() - Allocate a new @mcb_bus
	267	*
	268	* Allocate a new @mcb_bus.
	269	*/
4ec65b77	270	struct mcb_bus mcb_alloc_bus(struct device carrier)
3764e82e JT	271	{
	272	struct mcb_bus *bus;
	273	int bus_nr;
18d28819	274	int rc;
3764e82e JT	275
	276	bus = kzalloc(sizeof(struct mcb_bus), GFP_KERNEL);
	277	if (!bus)
4ec65b77	278	return ERR_PTR(-ENOMEM);
3764e82e JT	279
	280	bus_nr = ida_simple_get(&mcb_ida, 0, 0, GFP_KERNEL);
	281	if (bus_nr < 0) {
18d28819 JT	282	rc = bus_nr;
18d28819 JT	283	goto err_free;
3764e82e JT	284	}
3764e82e JT	285
3764e82e	286	bus->bus_nr = bus_nr;
5d9e2ab9	287	bus->carrier = get_device(carrier);
18d28819 JT	288
	289	device_initialize(&bus->dev);
	290	bus->dev.parent = carrier;
	291	bus->dev.bus = &mcb_bus_type;
803f1ca6	292	bus->dev.type = &mcb_carrier_device_type;
5d9e2ab9	293	bus->dev.release = &mcb_free_bus;
18d28819 JT	294
	295	dev_set_name(&bus->dev, "mcb:%d", bus_nr);
	296	rc = device_add(&bus->dev);
	297	if (rc)
	298	goto err_free;
	299
3764e82e	300	return bus;
18d28819	301	err_free:
5d9e2ab9	302	put_device(carrier);
18d28819 JT	303	kfree(bus);
18d28819 JT	304	return ERR_PTR(rc);
3764e82e JT	305	}
	306	EXPORT_SYMBOL_GPL(mcb_alloc_bus);
	307
	308	static int __mcb_devices_unregister(struct device dev, void data)
	309	{
	310	device_unregister(dev);
	311	return 0;
	312	}
	313
	314	static void mcb_devices_unregister(struct mcb_bus *bus)
	315	{
	316	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_devices_unregister);
	317	}
	318	/**
	319	* mcb_release_bus() - Free a @mcb_bus
	320	* @bus: The @mcb_bus to release
	321	*
	322	* Release an allocated @mcb_bus from the system.
	323	*/
	324	void mcb_release_bus(struct mcb_bus *bus)
	325	{
	326	mcb_devices_unregister(bus);
3764e82e JT	327	}
	328	EXPORT_SYMBOL_GPL(mcb_release_bus);
	329
	330	/**
	331	* mcb_bus_put() - Increment refcnt
	332	* @bus: The @mcb_bus
	333	*
	334	* Get a @mcb_bus' ref
	335	*/
	336	struct mcb_bus mcb_bus_get(struct mcb_bus bus)
	337	{
	338	if (bus)
	339	get_device(&bus->dev);
	340
	341	return bus;
	342	}
	343	EXPORT_SYMBOL_GPL(mcb_bus_get);
	344
	345	/**
	346	* mcb_bus_put() - Decrement refcnt
	347	* @bus: The @mcb_bus
	348	*
	349	* Release a @mcb_bus' ref
	350	*/
	351	void mcb_bus_put(struct mcb_bus *bus)
	352	{
	353	if (bus)
	354	put_device(&bus->dev);
	355	}
	356	EXPORT_SYMBOL_GPL(mcb_bus_put);
	357
	358	/**
	359	* mcb_alloc_dev() - Allocate a device
	360	* @bus: The @mcb_bus the device is part of
	361	*
	362	* Allocate a @mcb_device and add bus.
	363	*/
	364	struct mcb_device mcb_alloc_dev(struct mcb_bus bus)
	365	{
	366	struct mcb_device *dev;
	367
	368	dev = kzalloc(sizeof(struct mcb_device), GFP_KERNEL);
	369	if (!dev)
	370	return NULL;
	371
3764e82e JT	372	dev->bus = bus;
	373
	374	return dev;
	375	}
	376	EXPORT_SYMBOL_GPL(mcb_alloc_dev);
	377
	378	/**
	379	* mcb_free_dev() - Free @mcb_device
	380	* @dev: The device to free
	381	*
	382	* Free a @mcb_device
	383	*/
	384	void mcb_free_dev(struct mcb_device *dev)
	385	{
	386	kfree(dev);
	387	}
	388	EXPORT_SYMBOL_GPL(mcb_free_dev);
	389
	390	static int __mcb_bus_add_devices(struct device dev, void data)
	391	{
	392	struct mcb_device *mdev = to_mcb_device(dev);
	393	int retval;
	394
	395	if (mdev->is_added)
	396	return 0;
	397
	398	retval = device_attach(dev);
	399	if (retval < 0)
	400	dev_err(dev, "Error adding device (%d)\n", retval);
	401
	402	mdev->is_added = true;
	403
	404	return 0;
	405	}
	406
3764e82e JT	407	/**
	408	* mcb_bus_add_devices() - Add devices in the bus' internal device list
	409	* @bus: The @mcb_bus we add the devices
	410	*
	411	* Add devices in the bus' internal device list to the system.
	412	*/
	413	void mcb_bus_add_devices(const struct mcb_bus *bus)
	414	{
	415	bus_for_each_dev(&mcb_bus_type, NULL, NULL, __mcb_bus_add_devices);
3764e82e JT	416	}
	417	EXPORT_SYMBOL_GPL(mcb_bus_add_devices);
	418
	419	/**
	420	* mcb_request_mem() - Request memory
	421	* @dev: The @mcb_device the memory is for
	422	* @name: The name for the memory reference.
	423	*
	424	* Request memory for a @mcb_device. If @name is NULL the driver name will
	425	* be used.
	426	*/
	427	struct resource mcb_request_mem(struct mcb_device dev, const char *name)
	428	{
	429	struct resource *mem;
	430	u32 size;
	431
	432	if (!name)
	433	name = dev->dev.driver->name;
	434
	435	size = resource_size(&dev->mem);
	436
	437	mem = request_mem_region(dev->mem.start, size, name);
	438	if (!mem)
	439	return ERR_PTR(-EBUSY);
	440
	441	return mem;
	442	}
	443	EXPORT_SYMBOL_GPL(mcb_request_mem);
	444
	445	/**
	446	* mcb_release_mem() - Release memory requested by device
	447	* @dev: The @mcb_device that requested the memory
	448	*
	449	* Release memory that was prior requested via @mcb_request_mem().
	450	*/
	451	void mcb_release_mem(struct resource *mem)
	452	{
	453	u32 size;
	454
	455	size = resource_size(mem);
	456	release_mem_region(mem->start, size);
	457	}
	458	EXPORT_SYMBOL_GPL(mcb_release_mem);
	459
4ec65b77 JT	460	static int __mcb_get_irq(struct mcb_device *dev)
	461	{
	462	struct resource *irq = &dev->irq;
	463
	464	return irq->start;
	465	}
	466
3764e82e JT	467	/**
	468	* mcb_get_irq() - Get device's IRQ number
	469	* @dev: The @mcb_device the IRQ is for
	470	*
	471	* Get the IRQ number of a given @mcb_device.
	472	*/
	473	int mcb_get_irq(struct mcb_device *dev)
	474	{
4ec65b77	475	struct mcb_bus *bus = dev->bus;
3764e82e	476
4ec65b77 JT	477	if (bus->get_irq)
	478	return bus->get_irq(dev);
	479
	480	return __mcb_get_irq(dev);
3764e82e JT	481	}
	482	EXPORT_SYMBOL_GPL(mcb_get_irq);
	483
	484	static int mcb_init(void)
	485	{
	486	return bus_register(&mcb_bus_type);
	487	}
	488
	489	static void mcb_exit(void)
	490	{
169883a6	491	ida_destroy(&mcb_ida);
3764e82e JT	492	bus_unregister(&mcb_bus_type);
	493	}
	494
	495	/* mcb must be initialized after PCI but before the chameleon drivers.
	496	* That means we must use some initcall between subsys_initcall and
	497	* device_initcall.
	498	*/
	499	fs_initcall(mcb_init);
	500	module_exit(mcb_exit);
	501
	502	MODULE_DESCRIPTION("MEN Chameleon Bus Driver");
	503	MODULE_AUTHOR("Johannes Thumshirn <johannes.thumshirn@men.de>");
	504	MODULE_LICENSE("GPL v2");