Release 4.7 samples/kobject/kobject-example.c
/*
* Sample kobject implementation
*
* Copyright (C) 2004-2007 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2007 Novell Inc.
*
* Released under the GPL version 2 only.
*
*/
#include <linux/kobject.h>
#include <linux/string.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/init.h>
/*
* This module shows how to create a simple subdirectory in sysfs called
* /sys/kernel/kobject-example In that directory, 3 files are created:
* "foo", "baz", and "bar". If an integer is written to these files, it can be
* later read out of it.
*/
static int foo;
static int baz;
static int bar;
/*
* The "foo" file where a static variable is read from and written to.
*/
static ssize_t foo_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "%d\n", foo);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| greg kroah-hartman | greg kroah-hartman | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
static ssize_t foo_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
int ret;
ret = kstrtoint(buf, 10, &foo);
if (ret < 0)
return ret;
return count;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| greg kroah-hartman | greg kroah-hartman | 35 | 68.63% | 1 | 50.00% |
| rastislav barlik | rastislav barlik | 16 | 31.37% | 1 | 50.00% |
| Total | 51 | 100.00% | 2 | 100.00% |
/* Sysfs attributes cannot be world-writable. */
static struct kobj_attribute foo_attribute =
__ATTR(foo, 0664, foo_show, foo_store);
/*
* More complex function where we determine which variable is being accessed by
* looking at the attribute for the "baz" and "bar" files.
*/
static ssize_t b_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
int var;
if (strcmp(attr->attr.name, "baz") == 0)
var = baz;
else
var = bar;
return sprintf(buf, "%d\n", var);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| greg kroah-hartman | greg kroah-hartman | 57 | 100.00% | 1 | 100.00% |
| Total | 57 | 100.00% | 1 | 100.00% |
static ssize_t b_store(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count)
{
int var, ret;
ret = kstrtoint(buf, 10, &var);
if (ret < 0)
return ret;
if (strcmp(attr->attr.name, "baz") == 0)
baz = var;
else
bar = var;
return count;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| greg kroah-hartman | greg kroah-hartman | 62 | 80.52% | 1 | 50.00% |
| rastislav barlik | rastislav barlik | 15 | 19.48% | 1 | 50.00% |
| Total | 77 | 100.00% | 2 | 100.00% |
static struct kobj_attribute baz_attribute =
__ATTR(baz, 0664, b_show, b_store);
static struct kobj_attribute bar_attribute =
__ATTR(bar, 0664, b_show, b_store);
/*
* Create a group of attributes so that we can create and destroy them all
* at once.
*/
static struct attribute *attrs[] = {
&foo_attribute.attr,
&baz_attribute.attr,
&bar_attribute.attr,
NULL, /* need to NULL terminate the list of attributes */
};
/*
* An unnamed attribute group will put all of the attributes directly in
* the kobject directory. If we specify a name, a subdirectory will be
* created for the attributes with the directory being the name of the
* attribute group.
*/
static struct attribute_group attr_group = {
.attrs = attrs,
};
static struct kobject *example_kobj;
static int __init example_init(void)
{
int retval;
/*
* Create a simple kobject with the name of "kobject_example",
* located under /sys/kernel/
*
* As this is a simple directory, no uevent will be sent to
* userspace. That is why this function should not be used for
* any type of dynamic kobjects, where the name and number are
* not known ahead of time.
*/
example_kobj = kobject_create_and_add("kobject_example", kernel_kobj);
if (!example_kobj)
return -ENOMEM;
/* Create the files associated with this kobject */
retval = sysfs_create_group(example_kobj, &attr_group);
if (retval)
kobject_put(example_kobj);
return retval;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| greg kroah-hartman | greg kroah-hartman | 53 | 98.15% | 1 | 50.00% |
| qinghuang feng | qinghuang feng | 1 | 1.85% | 1 | 50.00% |
| Total | 54 | 100.00% | 2 | 100.00% |
static void __exit example_exit(void)
{
kobject_put(example_kobj);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| greg kroah-hartman | greg kroah-hartman | 13 | 92.86% | 1 | 50.00% |
| qinghuang feng | qinghuang feng | 1 | 7.14% | 1 | 50.00% |
| Total | 14 | 100.00% | 2 | 100.00% |
module_init(example_init);
module_exit(example_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Greg Kroah-Hartman <greg@kroah.com>");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| greg kroah-hartman | greg kroah-hartman | 392 | 90.95% | 2 | 33.33% |
| rastislav barlik | rastislav barlik | 31 | 7.19% | 1 | 16.67% |
| rusty russell | rusty russell | 4 | 0.93% | 1 | 16.67% |
| radu voicilas | radu voicilas | 2 | 0.46% | 1 | 16.67% |
| qinghuang feng | qinghuang feng | 2 | 0.46% | 1 | 16.67% |
| Total | 431 | 100.00% | 6 | 100.00% |
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