platform设备与设备driver之间的关系

最新推荐文章于 2025-07-09 20:52:31 发布

转载最新推荐文章于 2025-07-09 20:52:31 发布 · 420 阅读

文章标签：

#struct #module #shell #makefile #resources #string

本文介绍了一个简单的平台设备驱动的开发过程，包括硬/软件环境、模块C代码实现、Makefile配置以及驱动的注册与卸载流程。通过执行make命令，模块能够成功加载，并在指定路径下生成相应的系统文件。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

一个简单的platform设备驱动
硬/软件环境：s3c2440/linux-2.6.36/busybox-1.18.4/arm-linux-gcc 4.4.3

下面是模块的c代码：

#include <linux/module.h> #include <linux/init.h> #include <linux/fs.h> #include <linux/cdev.h> #include <linux/mm.h> #include <linux/ioport.h> #include <linux/interrupt.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/platform_device.h> #include <asm/io.h> MODULE_LICENSE("GPL"); MODULE_AUTHOR("zl"); int zl_probe(struct device * dev) { struct platform_device *pdev = container_of(dev, struct platform_device, dev); struct resource *res = pdev->resource; printk("driver zl_probe.\n"); return 0; } int zl_remove(struct device * dev) { printk("driver zl_remove.\n"); return 0; } struct device_driver zl_driver_struct = { .name = "zl_device", //this string will be show as /sys/bus/platform/drivers/zl_device .bus = &platform_bus_type, .probe = zl_probe, .remove = zl_remove, }; void zl_release(struct device *dev) { printk("device release.\n"); } struct resource zl_res[] = { { .name = "zl_res_name", .start = 0x56000000, .end = 0x57000000, .flags = IORESOURCE_IO, }, { .start = IRQ_EINT2, .end = IRQ_EINT2, .flags = IORESOURCE_IRQ, }, }; struct platform_device zl_dev = { .name = "zl_device", //this string will be show as /sys/devices/platform/zl_device.0 .dev = { .release = zl_release, }, .num_resources = ARRAY_SIZE(zl_res), .resource = zl_res, }; int test_init(void) { int ret = 0; platform_device_register(&zl_dev); driver_register(&zl_driver_struct); return ret; } void test_exit(void) { driver_unregister(&zl_driver_struct); platform_device_unregister(&zl_dev); } module_init(test_init); module_exit(test_exit);

下面是Makefile文件内容：

#KERNEL = /home/zl/my2440-2.6.13 KERNEL = /media/STUDY/linux/kernel/my2440-2.6.36 #KERNEL = /lib/modules/$(shell uname -r)/build default: make -C $(KERNEL) M=$(shell pwd) modules clean: make -C $(KERNEL) M=$(shell pwd) modules clean modules_install: make -C $(KERNEL) M=$(shell pwd) modules_install INSTALL_MOD_PATH=/home/zl/s3c2440_nfs depmod -a -b /home/zl/s3c2440_nfs 2.6.36-MY2440 obj-m += driver.o

执行make命令后，“insmod driver.ko”插入模块后

/sys/devices/platform/zl_device.0文件生成
    /sys/bus/platform/devices/目录下有名为zl_device.0的链接文件指向../../../devices/platform/zl_device.0
    /sys/bus/platform/drivers/zl_device/目录下有zl_device.0软链接指向../../../../devices/platform/zl_device.0
    如果platform_device结构体中name与device_driver结构中的name值相同就会执行probe指向的函数zl_probe函数