ifneq ($(KERNELRELEASE),)
obj-m :=  platform_dev.o  platform_drv.o
else
KDIR := /opt/FriendlyARM/mini2440/linux-2.6.32.2
#KDIR := /lib/modules/`uname -r`/build
all:  make -C $(KDIR) M=$(PWD) modules
clean:  rm -f *.ko *.o *.mod.o *.mod.c *.symvers
endif  

设备中去掉资源项，并使用内核alloc的设备在将其add到平台总线，不必registe设备了

/******************platfrom_dev.c***************************/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/kernel.h>#define DEVICE_NAME "song_rfid"
static struct platform_device *my_device;static int __init my_init(void)
{int ret=0;my_device= platform_device_alloc(DEVICE_NAME,-1);//this name is matched for driver,song_rfidret=platform_device_add(my_device);if (ret == 0) {printk("Register %s\n",DEVICE_NAME);} else {printk("Register  error.\n");platform_device_put(my_device);}return ret;
}static void __exit my_exit(void)
{platform_device_unregister(my_device);printk("Unregister %s\n",DEVICE_NAME);
}module_init(my_init);
module_exit(my_exit);MODULE_LICENSE("GPL");
MODULE_VERSION("1.5");

/******************platfrom_drv.c***************************/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>#define DRIVER_NAME "song_rfid"static int  my_probe(struct platform_device *pdev)
{printk("driver find device : %s which can handle\n",DRIVER_NAME);return 0;
}static int  my_remove(struct platform_device *pdev)
{printk("driver found device : %s unpluged\n",DRIVER_NAME);return 0;
}static struct platform_driver my_driver = {.probe         = my_probe,.remove     = my_remove,.driver    = {.owner  = THIS_MODULE,.name    = DRIVER_NAME,//this name is matched for driver,song_rfid},
};static int __init my_init(void)
{printk("Register my_driver.\n");return platform_driver_register(&my_driver);
}static void __exit my_exit(void)
{printk("Unregister my_driver.\n");platform_driver_unregister(&my_driver);
}module_init(my_init);
module_exit(my_exit);MODULE_LICENSE("GPL");

[root@FriendlyARM plg]# lsmod
[root@FriendlyARM plg]# insmod platform_dev.ko
Register song_rfid
[root@FriendlyARM plg]# insmod platform_drv.ko
Register my_driver.
driver find device : song_rfid which can handle
[root@FriendlyARM plg]# ls /sys/bus/platform/devices/
dm9000             s3c2410-rtc        s3c2440-sdi        s3c24xx_uda134x.0
regulatory.0       s3c2410-spi.0      s3c2440-uart.0     soc-audio
s3c2410-iis        s3c2410-wdt        s3c2440-uart.1     song_rfid
s3c2410-lcd        s3c2440-i2c        s3c2440-uart.2
s3c2410-ohci       s3c2440-nand       s3c2440-usbgadget
[root@FriendlyARM plg]# ls /sys/bus/platform/drivers
dm9000           s3c2410-ohci     s3c2440-uart     song_rfid
s3c-i2c          s3c2410-rtc      s3c24xx-nand
s3c-sdi          s3c2410-spi      s3c24xx_uda134x
s3c2410-lcd      s3c2412-lcd      soc-audio
[root@FriendlyARM plg]# rmmod platform_dev
driver found device : song_rfid unpluged
Unregister song_rfid
rmmod: module 'platform_dev' not found
[root@FriendlyARM plg]# rmmod platform_drv
Unregister my_driver.
rmmod: module 'platform_drv' not found
[root@FriendlyARM plg]# lsmod
[root@FriendlyARM plg]#