Release 4.12 drivers/base/driver.c

/*
 * driver.c - centralized device driver management
 *
 * Copyright (c) 2002-3 Patrick Mochel
 * Copyright (c) 2002-3 Open Source Development Labs
 * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
 * Copyright (c) 2007 Novell Inc.
 *
 * This file is released under the GPLv2
 *
 */

#include <linux/device.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include "base.h"



static struct device *next_device(struct klist_iter *i)
{
	struct klist_node *n = klist_next(i);
	struct device *dev = NULL;
	struct device_private *dev_prv;

	if (n) {
		dev_prv = to_device_private_driver(n);
		dev = dev_prv->device;
	}
	return dev;
}

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Greg Kroah-Hartman
30
52.63%
2
66.67%
Patrick Mochel
27
47.37%
1
33.33%
Total
57
100.00%
3
100.00%

/**
 * driver_for_each_device - Iterator for devices bound to a driver.
 * @drv: Driver we're iterating.
 * @start: Device to begin with
 * @data: Data to pass to the callback.
 * @fn: Function to call for each device.
 *
 * Iterate over the @drv's list of devices calling @fn for each one.
 */


int driver_for_each_device(struct device_driver *drv, struct device *start,
			   void *data, int (*fn)(struct device *, void *))
{
	struct klist_iter i;
	struct device *dev;
	int error = 0;

	if (!drv)
		return -EINVAL;

	klist_iter_init_node(&drv->p->klist_devices, &i,
			     start ? &start->p->knode_driver : NULL);
	while ((dev = next_device(&i)) && !error)
		error = fn(dev, data);
	klist_iter_exit(&i);
	return error;
}
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Patrick Mochel
109
96.46%
2
50.00%
Greg Kroah-Hartman
4
3.54%
2
50.00%
Total
113
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(driver_for_each_device);

/**
 * driver_find_device - device iterator for locating a particular device.
 * @drv: The device's driver
 * @start: Device to begin with
 * @data: Data to pass to match function
 * @match: Callback function to check device
 *
 * This is similar to the driver_for_each_device() 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 *driver_find_device(struct device_driver *drv,
				  struct device *start, void *data,
				  int (*match)(struct device *dev, void *data))
{
	struct klist_iter i;
	struct device *dev;

	if (!drv || !drv->p)
		return NULL;

	klist_iter_init_node(&drv->p->klist_devices, &i,
			     (start ? &start->p->knode_driver : NULL));
	while ((dev = next_device(&i)))
		if (match(dev, data) && get_device(dev))
			break;
	klist_iter_exit(&i);
	return dev;
}
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Cornelia Huck
109
90.08%
1
16.67%
Greg Kroah-Hartman
7
5.79%
4
66.67%
Hiroshi Doyu
5
4.13%
1
16.67%
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121
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6
100.00%


EXPORT_SYMBOL_GPL(driver_find_device);

/**
 * driver_create_file - create sysfs file for driver.
 * @drv: driver.
 * @attr: driver attribute descriptor.
 */


int driver_create_file(struct device_driver *drv,
		       const struct driver_attribute *attr)
{
	int error;

	if (drv)
		error = sysfs_create_file(&drv->p->kobj, &attr->attr);
	else
		error = -EINVAL;
	return error;
}
Contributors
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CommitProp
Patrick Mochel
46
93.88%
1
33.33%
Greg Kroah-Hartman
2
4.08%
1
33.33%
Phil Carmody
1
2.04%
1
33.33%
Total
49
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(driver_create_file);

/**
 * driver_remove_file - remove sysfs file for driver.
 * @drv: driver.
 * @attr: driver attribute descriptor.
 */


void driver_remove_file(struct device_driver *drv,
			const struct driver_attribute *attr)
{
	if (drv)
		sysfs_remove_file(&drv->p->kobj, &attr->attr);
}
Contributors
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CommitProp
Patrick Mochel
32
91.43%
1
33.33%
Greg Kroah-Hartman
2
5.71%
1
33.33%
Phil Carmody
1
2.86%
1
33.33%
Total
35
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(driver_remove_file);



int driver_add_groups(struct device_driver *drv,
		      const struct attribute_group **groups)
{
	return sysfs_create_groups(&drv->p->kobj, groups);
}

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Cornelia Huck
25
83.33%
1
25.00%
Greg Kroah-Hartman
4
13.33%
2
50.00%
David Brownell
1
3.33%
1
25.00%
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30
100.00%
4
100.00%



void driver_remove_groups(struct device_driver *drv,
			  const struct attribute_group **groups)
{
	sysfs_remove_groups(&drv->p->kobj, groups);
}

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Cornelia Huck
25
86.21%
1
25.00%
Greg Kroah-Hartman
3
10.34%
2
50.00%
David Brownell
1
3.45%
1
25.00%
Total
29
100.00%
4
100.00%

/**
 * driver_register - register driver with bus
 * @drv: driver to register
 *
 * We pass off most of the work to the bus_add_driver() call,
 * since most of the things we have to do deal with the bus
 * structures.
 */


int driver_register(struct device_driver *drv)
{
	int ret;
	struct device_driver *other;

	BUG_ON(!drv->bus->p);

	if ((drv->bus->probe && drv->probe) ||
	    (drv->bus->remove && drv->remove) ||
	    (drv->bus->shutdown && drv->shutdown))
		printk(KERN_WARNING "Driver '%s' needs updating - please use "
			"bus_type methods\n", drv->name);

	other = driver_find(drv->name, drv->bus);
	if (other) {
		printk(KERN_ERR "Error: Driver '%s' is already registered, "
			"aborting...\n", drv->name);
		return -EBUSY;
	}

	ret = bus_add_driver(drv);
	if (ret)
		return ret;
	ret = driver_add_groups(drv, drv->groups);
	if (ret) {
		bus_remove_driver(drv);
		return ret;
	}
	kobject_uevent(&drv->p->kobj, KOBJ_ADD);

	return ret;
}
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Russell King
47
28.48%
1
8.33%
Stas Sergeev
39
23.64%
2
16.67%
Cornelia Huck
35
21.21%
1
8.33%
Sebastian Ott
17
10.30%
2
16.67%
Patrick Mochel
15
9.09%
4
33.33%
Dave Young
10
6.06%
1
8.33%
Greg Kroah-Hartman
2
1.21%
1
8.33%
Total
165
100.00%
12
100.00%


EXPORT_SYMBOL_GPL(driver_register);

/**
 * driver_unregister - remove driver from system.
 * @drv: driver.
 *
 * Again, we pass off most of the work to the bus-level call.
 */


void driver_unregister(struct device_driver *drv)
{
	if (!drv || !drv->p) {
		WARN(1, "Unexpected driver unregister!\n");
		return;
	}
	driver_remove_groups(drv, drv->groups);
	bus_remove_driver(drv);
}
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Kay Sievers
20
45.45%
1
20.00%
Patrick Mochel
15
34.09%
3
60.00%
Cornelia Huck
9
20.45%
1
20.00%
Total
44
100.00%
5
100.00%


EXPORT_SYMBOL_GPL(driver_unregister);

/**
 * driver_find - locate driver on a bus by its name.
 * @name: name of the driver.
 * @bus: bus to scan for the driver.
 *
 * Call kset_find_obj() to iterate over list of drivers on
 * a bus to find driver by name. Return driver if found.
 *
 * This routine provides no locking to prevent the driver it returns
 * from being unregistered or unloaded while the caller is using it.
 * The caller is responsible for preventing this.
 */


struct device_driver *driver_find(const char *name, struct bus_type *bus)
{
	struct kobject *k = kset_find_obj(bus->p->drivers_kset, name);
	struct driver_private *priv;

	if (k) {
		/* Drop reference added by kset_find_obj() */
		kobject_put(k);
		priv = to_driver(k);
		return priv->driver;
	}
	return NULL;
}
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Dmitry Torokhov
41
63.08%
1
20.00%
Greg Kroah-Hartman
18
27.69%
3
60.00%
Alan Stern
6
9.23%
1
20.00%
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65
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5
100.00%


EXPORT_SYMBOL_GPL(driver_find);
Overall Contributors
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Patrick Mochel
259
33.55%
9
24.32%
Cornelia Huck
208
26.94%
2
5.41%
Greg Kroah-Hartman
104
13.47%
11
29.73%
Russell King
47
6.09%
1
2.70%
Dmitry Torokhov
45
5.83%
1
2.70%
Stas Sergeev
39
5.05%
2
5.41%
Kay Sievers
20
2.59%
1
2.70%
Sebastian Ott
17
2.20%
2
5.41%
Dave Young
10
1.30%
1
2.70%
Alan Stern
7
0.91%
1
2.70%
Hiroshi Doyu
5
0.65%
1
2.70%
Matthew Wilcox
3
0.39%
1
2.70%
Tejun Heo
3
0.39%
1
2.70%
Phil Carmody
2
0.26%
1
2.70%
David Brownell
2
0.26%
1
2.70%
Randy Dunlap
1
0.13%
1
2.70%
Total
772
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37
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Directory: drivers/base

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