bus.c

linux 内核源代码

/*
 * bus.c - bus driver management
 *
 * Copyright (c) 2002-3 Patrick Mochel
 * Copyright (c) 2002-3 Open Source Development Labs
 *
 * This file is released under the GPLv2
 *
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/string.h>
#include "base.h"
#include "power/power.h"

#define to_bus_attr(_attr) container_of(_attr, struct bus_attribute, attr)
#define to_bus(obj) container_of(obj, struct bus_type, subsys.kobj)

/*
 * sysfs bindings for drivers
 */

#define to_drv_attr(_attr) container_of(_attr, struct driver_attribute, attr)
#define to_driver(obj) container_of(obj, struct device_driver, kobj)


static int __must_check bus_rescan_devices_helper(struct device *dev,
						void *data);

static struct bus_type *bus_get(struct bus_type *bus)
{
	return bus ? container_of(kset_get(&bus->subsys),
				struct bus_type, subsys) : NULL;
}

static void bus_put(struct bus_type *bus)
{
	kset_put(&bus->subsys);
}

static ssize_t
drv_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
{
	struct driver_attribute * drv_attr = to_drv_attr(attr);
	struct device_driver * drv = to_driver(kobj);
	ssize_t ret = -EIO;

	if (drv_attr->show)
		ret = drv_attr->show(drv, buf);
	return ret;
}

static ssize_t
drv_attr_store(struct kobject * kobj, struct attribute * attr,
	       const char * buf, size_t count)
{
	struct driver_attribute * drv_attr = to_drv_attr(attr);
	struct device_driver * drv = to_driver(kobj);
	ssize_t ret = -EIO;

	if (drv_attr->store)
		ret = drv_attr->store(drv, buf, count);
	return ret;
}

static struct sysfs_ops driver_sysfs_ops = {
	.show	= drv_attr_show,
	.store	= drv_attr_store,
};


static void driver_release(struct kobject * kobj)
{
	/*
	 * Yes this is an empty release function, it is this way because struct
	 * device is always a static object, not a dynamic one.  Yes, this is
	 * not nice and bad, but remember, drivers are code, reference counted
	 * by the module count, not a device, which is really data.  And yes,
	 * in the future I do want to have all drivers be created dynamically,
	 * and am working toward that goal, but it will take a bit longer...
	 *
	 * But do not let this example give _anyone_ the idea that they can
	 * create a release function without any code in it at all, to do that
	 * is almost always wrong.  If you have any questions about this,
	 * please send an email to <[e-mail]>
	 */
}

static struct kobj_type driver_ktype = {
	.sysfs_ops	= &driver_sysfs_ops,
	.release	= driver_release,
};


/*
 * sysfs bindings for buses
 */


static ssize_t
bus_attr_show(struct kobject * kobj, struct attribute * attr, char * buf)
{
	struct bus_attribute * bus_attr = to_bus_attr(attr);
	struct bus_type * bus = to_bus(kobj);
	ssize_t ret = 0;

	if (bus_attr->show)
		ret = bus_attr->show(bus, buf);
	return ret;
}

static ssize_t
bus_attr_store(struct kobject * kobj, struct attribute * attr,
	       const char * buf, size_t count)
{
	struct bus_attribute * bus_attr = to_bus_attr(attr);
	struct bus_type * bus = to_bus(kobj);
	ssize_t ret = 0;

	if (bus_attr->store)
		ret = bus_attr->store(bus, buf, count);
	return ret;
}

static struct sysfs_ops bus_sysfs_ops = {
	.show	= bus_attr_show,
	.store	= bus_attr_store,
};

int bus_create_file(struct bus_type * bus, struct bus_attribute * attr)
{
	int error;
	if (bus_get(bus)) {
		error = sysfs_create_file(&bus->subsys.kobj, &attr->attr);
		bus_put(bus);
	} else
		error = -EINVAL;
	return error;
}

void bus_remove_file(struct bus_type * bus, struct bus_attribute * attr)
{
	if (bus_get(bus)) {
		sysfs_remove_file(&bus->subsys.kobj, &attr->attr);
		bus_put(bus);
	}
}

static struct kobj_type bus_ktype = {
	.sysfs_ops	= &bus_sysfs_ops,
};

static int bus_uevent_filter(struct kset *kset, struct kobject *kobj)
{
	struct kobj_type *ktype = get_ktype(kobj);

	if (ktype == &bus_ktype)
		return 1;
	return 0;
}

static struct kset_uevent_ops bus_uevent_ops = {
	.filter = bus_uevent_filter,
};

static decl_subsys(bus, &bus_ktype, &bus_uevent_ops);


#ifdef CONFIG_HOTPLUG
/* Manually detach a device from its associated driver. */
static int driver_helper(struct device *dev, void *data)
{
	const char *name = data;

	if (strcmp(name, dev->bus_id) == 0)
		return 1;
	return 0;
}

static ssize_t driver_unbind(struct device_driver *drv,
			     const char *buf, size_t count)
{
	struct bus_type *bus = bus_get(drv->bus);
	struct device *dev;
	int err = -ENODEV;

	dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
	if (dev && dev->driver == drv) {
		if (dev->parent)	/* Needed for USB */
			down(&dev->parent->sem);
		device_release_driver(dev);
		if (dev->parent)
			up(&dev->parent->sem);
		err = count;
	}
	put_device(dev);
	bus_put(bus);
	return err;
}
static DRIVER_ATTR(unbind, S_IWUSR, NULL, driver_unbind);

/*
 * Manually attach a device to a driver.
 * Note: the driver must want to bind to the device,
 * it is not possible to override the driver's id table.
 */
static ssize_t driver_bind(struct device_driver *drv,
			   const char *buf, size_t count)
{
	struct bus_type *bus = bus_get(drv->bus);
	struct device *dev;
	int err = -ENODEV;

	dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
	if (dev && dev->driver == NULL) {
		if (dev->parent)	/* Needed for USB */
			down(&dev->parent->sem);
		down(&dev->sem);
		err = driver_probe_device(drv, dev);
		up(&dev->sem);
		if (dev->parent)
			up(&dev->parent->sem);

		if (err > 0) 		/* success */
			err = count;
		else if (err == 0)	/* driver didn't accept device */
			err = -ENODEV;
	}
	put_device(dev);
	bus_put(bus);
	return err;
}
static DRIVER_ATTR(bind, S_IWUSR, NULL, driver_bind);

static ssize_t show_drivers_autoprobe(struct bus_type *bus, char *buf)
{
	return sprintf(buf, "%d\n", bus->drivers_autoprobe);
}

static ssize_t store_drivers_autoprobe(struct bus_type *bus,
				       const char *buf, size_t count)
{
	if (buf[0] == '0')
		bus->drivers_autoprobe = 0;
	else
		bus->drivers_autoprobe = 1;
	return count;
}

static ssize_t store_drivers_probe(struct bus_type *bus,
				   const char *buf, size_t count)
{
	struct device *dev;

	dev = bus_find_device(bus, NULL, (void *)buf, driver_helper);
	if (!dev)
		return -ENODEV;
	if (bus_rescan_devices_helper(dev, NULL) != 0)
		return -EINVAL;
	return count;
}
#endif

static struct device * next_device(struct klist_iter * i)
{
	struct klist_node * n = klist_next(i);
	return n ? container_of(n, struct device, knode_bus) : NULL;
}

/**
 *	bus_for_each_dev - device iterator.
 *	@bus:	bus type.
 *	@start:	device to start iterating from.
 *	@data:	data for the callback.
 *	@fn:	function to be called for each device.
 *
 *	Iterate over @bus's list of devices, and call @fn for each,
 *	passing it @data. If @start is not NULL, we use that device to
 *	begin iterating from.
 *
 *	We check the return of @fn each time. If it returns anything
 *	other than 0, we break out and return that value.
 *
 *	NOTE: The device that returns a non-zero value is not retained
 *	in any way, nor is its refcount incremented. If the caller needs
 *	to retain this data, it should do, and increment the reference
 *	count in the supplied callback.
 */

int bus_for_each_dev(struct bus_type * bus, struct device * start,
		     void * data, int (*fn)(struct device *, void *))
{
	struct klist_iter i;
	struct device * dev;
	int error = 0;

	if (!bus)
		return -EINVAL;

	klist_iter_init_node(&bus->klist_devices, &i,
			     (start ? &start->knode_bus : NULL));
	while ((dev = next_device(&i)) && !error)
		error = fn(dev, data);
	klist_iter_exit(&i);
	return error;
}

/**
 * bus_find_device - device iterator for locating a particular device.
 * @bus: bus type
 * @start: Device to begin with
 * @data: Data to pass to match function
 * @match: Callback function to check device
 *
 * This is similar to the bus_for_each_dev() function above, but it
 * returns a reference to a device that is 'found' for later use, as
 * determined by the @match callback.
 *
 * The callback should return 0 if the device doesn't match and non-zero
 * if it does.  If the callback returns non-zero, this function will
 * return to the caller and not iterate over any more devices.
 */
struct device * bus_find_device(struct bus_type *bus,
				struct device *start, void *data,
				int (*match)(struct device *, void *))
{
	struct klist_iter i;
	struct device *dev;

	if (!bus)
		return NULL;

	klist_iter_init_node(&bus->klist_devices, &i,
			     (start ? &start->knode_bus : NULL));
	while ((dev = next_device(&i)))
		if (match(dev, data) && get_device(dev))
			break;
	klist_iter_exit(&i);
	return dev;
}


static struct device_driver * next_driver(struct klist_iter * i)
{
	struct klist_node * n = klist_next(i);
	return n ? container_of(n, struct device_driver, knode_bus) : NULL;
}

/**
 *	bus_for_each_drv - driver iterator
 *	@bus:	bus we're dealing with.
 *	@start:	driver to start iterating on.
 *	@data:	data to pass to the callback.
 *	@fn:	function to call for each driver.
 *
 *	This is nearly identical to the device iterator above.
 *	We iterate over each driver that belongs to @bus, and call
 *	@fn for each. If @fn returns anything but 0, we break out
 *	and return it. If @start is not NULL, we use it as the head
 *	of the list.
 *
 *	NOTE: we don't return the driver that returns a non-zero
 *	value, nor do we leave the reference count incremented for that
 *	driver. If the caller needs to know that info, it must set it
 *	in the callback. It must also be sure to increment the refcount
 *	so it doesn't disappear before returning to the caller.
 */

int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
		     void * data, int (*fn)(struct device_driver *, void *))
{
	struct klist_iter i;
	struct device_driver * drv;
	int error = 0;

	if (!bus)
		return -EINVAL;

	klist_iter_init_node(&bus->klist_drivers, &i,
			     start ? &start->knode_bus : NULL);
	while ((drv = next_driver(&i)) && !error)
		error = fn(drv, data);
	klist_iter_exit(&i);
	return error;
}

static int device_add_attrs(struct bus_type *bus, struct device *dev)
{
	int error = 0;
	int i;

	if (!bus->dev_attrs)
		return 0;

	for (i = 0; attr_name(bus->dev_attrs[i]); i++) {
		error = device_create_file(dev,&bus->dev_attrs[i]);
		if (error) {
			while (--i >= 0)
				device_remove_file(dev, &bus->dev_attrs[i]);
			break;
		}
	}
	return error;
}

static void device_remove_attrs(struct bus_type * bus, struct device * dev)
{
	int i;

	if (bus->dev_attrs) {
		for (i = 0; attr_name(bus->dev_attrs[i]); i++)
			device_remove_file(dev,&bus->dev_attrs[i]);
	}
}

#ifdef CONFIG_SYSFS_DEPRECATED
static int make_deprecated_bus_links(struct device *dev)
{
	return sysfs_create_link(&dev->kobj,
				 &dev->bus->subsys.kobj, "bus");
}

static void remove_deprecated_bus_links(struct device *dev)
{
	sysfs_remove_link(&dev->kobj, "bus");
}
#else
static inline int make_deprecated_bus_links(struct device *dev) { return 0; }
static inline void remove_deprecated_bus_links(struct device *dev) { }
#endif

/**
 *	bus_add_device - add device to bus
 *	@dev:	device being added
 *
 *	- Add the device to its bus's list of devices.
 *	- Create link to device's bus.
 */
int bus_add_device(struct device * dev)
{
	struct bus_type * bus = bus_get(dev->bus);
	int error = 0;

	if (bus) {
		pr_debug("bus %s: add device %s\n", bus->name, dev->bus_id);
		error = device_add_attrs(bus, dev);
		if (error)
			goto out_put;
		error = sysfs_create_link(&bus->devices.kobj,
						&dev->kobj, dev->bus_id);
		if (error)
			goto out_id;
		error = sysfs_create_link(&dev->kobj,
				&dev->bus->subsys.kobj, "subsystem");
		if (error)
			goto out_subsys;
		error = make_deprecated_bus_links(dev);
		if (error)
			goto out_deprecated;
	}
	return 0;

out_deprecated:
	sysfs_remove_link(&dev->kobj, "subsystem");
out_subsys:
	sysfs_remove_link(&bus->devices.kobj, dev->bus_id);
out_id:
	device_remove_attrs(bus, dev);
out_put:
	bus_put(dev->bus);
	return error;
}