嵌入式LINUX内核驱动深入班第2天（设备模型）

#include <linux/device.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/string.h> #include <linux/sysfs.h> #include <linux/stat.h> MODULE_AUTHOR("David Xie"); MODULE_LICENSE("Dual BSD/GPL"); void obj_test_release(struct kobject *kobject); ssize_t kobj_test_show(struct kobject *kobject, struct attribute *attr,char *buf); ssize_t kobj_test_store(struct kobject *kobject,struct attribute *attr,const char *buf, size_t count); struct attribute test_attr = { .name = "kobj_config", .mode = S_IRWXUGO, }; static struct attribute *def_attrs[] = { &test_attr, NULL, }; struct sysfs_ops obj_test_sysops = { .show = kobj_test_show, .store = kobj_test_store, }; struct kobj_type ktype = { .release = obj_test_release, .sysfs_ops=&obj_test_sysops, .default_attrs=def_attrs, }; void obj_test_release(struct kobject *kobject) { printk("eric_test: release .\n"); } ssize_t kobj_test_show(struct kobject *kobject, struct attribute *attr,char *buf) { printk("have show.\n"); printk("attrname:%s.\n", attr->name); sprintf(buf,"%s\n",attr->name); return strlen(attr->name)+2; } ssize_t kobj_test_store(struct kobject *kobject,struct attribute *attr,const char *buf, size_t count) { printk("havestore\n"); printk("write: %s\n",buf); return count; } struct kobject kobj; static int kobj_test_init() { printk("kboject test init.\n"); kobject_init_and_add(&kobj,&ktype,NULL,"kobject_test"); return 0; } static int kobj_test_exit() { printk("kobject test exit.\n"); kobject_del(&kobj); return 0; } module_init(kobj_test_init); module_exit(kobj_test_exit);