举例平台总线代码示例
时间: 2025-02-06 15:04:17 浏览: 19
平台总线(Platform Bus)是一种硬件架构,主要用于连接计算机系统内部的不同组件,如处理器、内存控制器、I/O设备等。一个常见的例子是在Linux内核中,通过PCI Express(PCIe)总线,我们可以访问和控制外部设备。下面是一个简化的PCIe设备驱动程序注册的C代码片段:
```c
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/bus.h>
static struct platform_device *pdev;
static int __devinit platform_driver_probe(struct device *dev) {
printk(KERN_INFO "Platform driver probing...\n");
pdev = to_platform_device(dev);
// ... 设备初始化和配置的代码 ...
return 0;
}
static void __devexit platform_driver_remove(struct device *dev) {
printk(KERN_INFO "Platform driver removing...\n");
// ... 清理和退出操作 ...
}
static const struct of_device_id platform_ids[] = {
{ .compatible = "example_compatible", },
{ /* end: all matches */ }
};
static struct platform_driver platform_driver = {
.probe = platform_driver_probe,
.remove = __devexit_p(platform_driver_remove),
.driver = {
.name = "example_driver",
.of_match_table = platform_ids,
},
};
module_platform_driver(platform_driver);
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