rfid5-写成platform驱动

上文platform驱动虽然可用，但内层要要写misc驱动，所以不使用设备提供的资源会更加简便。可以如下改一下
Makefile,同上文

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`/buildall:  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.0regulatory.0       s3c2410-spi.0      s3c2440-uart.0     soc-audios3c2410-iis        s3c2410-wdt        s3c2440-uart.1     song_rfids3c2410-lcd        s3c2440-i2c        s3c2440-uart.2s3c2410-ohci       s3c2440-nand       s3c2440-usbgadget[root@FriendlyARM plg]# ls /sys/bus/platform/driversdm9000           s3c2410-ohci     s3c2440-uart     song_rfids3c-i2c          s3c2410-rtc      s3c24xx-nands3c-sdi          s3c2410-spi      s3c24xx_uda134xs3c2410-lcd      s3c2412-lcd      soc-audio[root@FriendlyARM plg]# rmmod platform_dev driver found device : song_rfid unplugedUnregister song_rfidrmmod: module 'platform_dev' not found[root@FriendlyARM plg]# rmmod platform_drvUnregister my_driver.rmmod: module 'platform_drv' not found[root@FriendlyARM plg]# lsmod [root@FriendlyARM plg]#