Linux内核大讲堂 (一) 设备驱动的基石驱动模型(7)

Linux内核大讲堂(一)设备驱动的基石驱动模型（7）

终于快讲完了，这一节其实就是让上节我们所说的四大天王露下小脸。源码分析请自行完成吧。我建议大家可以试着先看一下代码，如果能看懂，那就把我写的那破玩意删掉，自已实现一遍，如果不能看懂，那马上回过去从第一小节重新看过，耐心，一定要有耐心，没耐心，啥都完了。帖上原码:

Makefile:

obj-m+=wwhs_bus.o

KERNELDIR=/opt/kernel/linux-2.6.38/linux-2.6.38.5

PWD:=$(shellpwd)

all:

make-C$(KERNELDIR)M=$(PWD)modules

clean:

rm-rf*.o**.ko**.mod.c*.cmd*.symvers.tmp_versions.*.cmd

wwhs_public.h:

#include<linux/module.h>

#include<linux/device.h>

#include<linux/kernel.h>

#include<linux/init.h>

#include<linux/stat.h>

#include<linux/slab.h>

#include<linux/kobject.h>

#include<linux/klist.h>

#include<linux/kdev_t.h>

#include<linux/fs.h>

#include<linux/major.h>

#include<linux/kprobes.h>

#definewwhs_dbg(dbgbuf)printk(KERN_ERR"wwhs:%s\n",dbgbuf);

#include"../wwhs_public.h"

#defineWWHS_MAJOR83

voidwwhs_release(structdevice*dev)

{

printk(KERN_ERR"wwhs:dev:%sisrelease\n",dev->kobj.name);

}

structdevicewwhs_bus={

.init_name ="wwhs",

.release=wwhs_release,

};

staticstructdevicewwhs_dev={

.init_name ="wwhsled0",

.release=wwhs_release,

};

staticintwwhs_bus_match(structdevice*dev,structdevice_driver*drv)

{

intret=-1;

ret=strncmp(dev->kobj.name,drv->name,strlen(drv->name));

printk(KERN_ERR"wwhs:dev->kobj.name:%sdrv->name:%sret:%d\n",dev->kobj.name,drv->name,ret);

return!ret;

}

staticintwwhs_bus_probe(structdevice*dev)

{

intret=-1;

if(dev->driver->probe)

ret=dev->driver->probe(dev);

returnret;

}

staticstructbus_typewwhs_bus_type={

.name ="wwhs",

.match =wwhs_bus_match,

};

staticstructclass*wwhs_class;

staticintwwhs_bus_register()

{

intret=-1;

wwhs_bus.class=wwhs_class;

ret=device_register(&wwhs_bus);

if(ret)gotodevice_error;

ret=bus_register(&wwhs_bus_type);

if(ret)gotobus_error;

returnret;

bus_error:

device_unregister(&wwhs_bus);

device_error:

returnret;

}

staticvoidwwhs_bus_unregister()

{

device_unregister(&wwhs_bus);

bus_unregister(&wwhs_bus_type);

}

staticintwwhs_class_register(void)

{

wwhs_class=class_create(THIS_MODULE,"wwhsclass");

if(IS_ERR(wwhs_class)){

printk(KERN_ERR"wwhs:classcreateerror\n");

returnPTR_ERR(wwhs_class);

}

printk(KERN_ERR"wwhs:classcreatesuccess\n");

return0;

}

staticvoidwwhs_class_unregister()

{

class_destroy(wwhs_class);

}

staticintwwhs_device_register(structdevice*dev)

{

dev->devt=MKDEV(WWHS_MAJOR,1);

dev->bus=&wwhs_bus_type;

dev->parent=&wwhs_bus;

returndevice_register(dev);

}

staticvoidwwhs_device_unregister(structdevice*wwhs_dev)

{

device_unregister(wwhs_dev);

}

staticstructdevice_driverwwhs_drv={

.name="wwhsled",

};

staticwwhs_drv_probe(structdevice*dev)

{

printk(KERN_ERR"wwhs:dev:%sisprobe\n",dev->kobj.name);

return0;

}

staticwwhs_drv_remove(structdevice*dev)

{

printk(KERN_ERR"wwhs:dev:%sisremove\n",dev->kobj.name);

return0;

}

staticintwwhs_driver_register(structdevice_driver*wwhs_driver)

{

intret=-1;

wwhs_driver->bus=&wwhs_bus_type;

wwhs_driver->owner=THIS_MODULE;

wwhs_driver->probe=wwhs_drv_probe;

wwhs_driver->remove=wwhs_drv_remove;

ret=driver_register(wwhs_driver);

returnret;

}

staticvoidwwhs_driver_unregister(structdevice_driver*wwhs_driver)

{

driver_unregister(wwhs_driver);

}

staticint__initwwhs_init()

{

intret=-1;

ret=wwhs_class_register();

if(ret)gotoerror;

ret=wwhs_bus_register();

if(ret)gotoerror;

ret=wwhs_device_register(&wwhs_dev);

if(ret)gotobus_error;

ret=wwhs_driver_register(&wwhs_drv);

if(ret)gotodevice_error;

returnret;

device_error:

wwhs_device_unregister(&wwhs_dev);

bus_error:

wwhs_bus_unregister();

class_error:

wwhs_class_unregister();

error:

returnret;

}

staticvoid__exitwwhs_exit()

{

wwhs_device_unregister(&wwhs_dev);

wwhs_driver_unregister(&wwhs_drv);

wwhs_bus_unregister();

wwhs_class_unregister();

}

module_init(wwhs_init);

module_exit(wwhs_exit);

MODULE_AUTHOR("wwhs");

MODULE_DESCRIPTION("wwhs_bustest");

MODULE_LICENSE("GPL");

上面就是四大天王小露一下脸，至此，驱动模型的分析要告一段落了。如果根着看了的朋友，我相信肯定是有所收获的。谢谢各位。你们的支持是我前进的动力。^_^

设备驱动模型就先讲到这里了，如果大家有什么好的建议，请进：

http://blog.youkuaiyun.com/z2007b/archive/2011/05/19/6431791.aspx

这里提出来。你们想要了解的，才是我想写的，要不然我写一堆大家都不感兴趣的东西，就没有价值了。谢谢。

上面示例代码下载地址：

http://d.download.youkuaiyun.com/down/3285515/z2007b

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