linux-uevent_and_sysfs

srclinuxandroidkernelLibKobject.c

struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)

此函数会创建一个kobject对象，并根据参数parent决定添加到sysfs中/sys的某个目录中，如果parent==NULL,则kobject对象就会直接被创建添加到/sys根目录。如下：

Genhd.c (srclinuxandroidkernelblock): block_depr = kobject_create_and_add("block", NULL);

Gen_vkeys.c(srclinuxandroidkerneldriversinputtouchscreen):vkey_obj = kobject_create_and_add("board_properties", NULL);

Core.c (srclinuxandroidkerneldriversbase): dev_kobj = kobject_create_and_add("dev", NULL);

Firmware.c (srclinuxandroidkerneldriversbase): firmware_kobj = kobject_create_and_add("firmware", NULL);

Namespace.c (srclinuxandroidkernelfs): fs_kobj = kobject_create_and_add("fs", NULL);

Ksysfs.c (srclinuxandroidkernelkernel): kernel_kobj = kobject_create_and_add("kernel", NULL);

Main.c (srclinuxandroidkernelkernelpower): power_kobj = kobject_create_and_add("power", NULL);

而有parent的就会创建到对应的parent目录下：

Core.c (srclinuxandroidkerneldriversbase): sysfs_dev_block_kobj = kobject_create_and_add("block", dev_kobj); 这里的dev_kobj是已经创建好了的，dev_kobj = kobject_create_and_add("dev", NULL);

Core.c (srclinuxandroidkerneldriversbase): sysfs_dev_char_kobj = kobject_create_and_add("char", dev_kobj);

那么/sys这个目录又是哪里来的呢，它是属于根文件系统的。编译打包加载后就会有，如下：