67 lines
1.5 KiB
C
Executable File
67 lines
1.5 KiB
C
Executable File
#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/kobject.h>
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static struct kset *kset;
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static struct kobject *kobj1;
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static struct kobject *kobj2;
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static unsigned int val = 0;
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static ssize_t val_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", val);
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}
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static ssize_t val_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count)
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{
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char *endp;
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printk("size = %d\n", count);
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val = simple_strtoul(buf, &endp, 10);
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return count;
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}
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static struct kobj_attribute kobj1_val_attr = __ATTR(val, 0666, val_show, val_store);
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static struct attribute *kobj1_attrs[] = {
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&kobj1_val_attr.attr,
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NULL,
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};
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static struct attribute_group kobj1_attr_group = {
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.attrs = kobj1_attrs,
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};
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static int __init model_init(void)
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{
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int ret;
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kset = kset_create_and_add("kset", NULL, NULL);
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kobj1 = kobject_create_and_add("kobj1", &kset->kobj);
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kobj2 = kobject_create_and_add("kobj2", &kset->kobj);
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ret = sysfs_create_group(kobj1, &kobj1_attr_group);
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ret = sysfs_create_link(kobj2, kobj1, "kobj1");
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return 0;
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}
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static void __exit model_exit(void)
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{
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sysfs_remove_link(kobj2, "kobj1");
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sysfs_remove_group(kobj1, &kobj1_attr_group);
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kobject_del(kobj2);
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kobject_del(kobj1);
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kset_unregister(kset);
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}
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module_init(model_init);
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module_exit(model_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Kevin Jiang <jiangxg@farsight.com.cn>");
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MODULE_DESCRIPTION("A simple module for device model");
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