/****************************************
* PCI接口的char设备驱动模板
* . PCI接口和platform很类似:
* pci_register_driver(struct pci_driver *pci_drv);
* pci_unregister_driver(struct pci_driver *pci_drv);
* . 主要实现以下两部分:
* 1. struct pci_driver的成员函数(主要是probe, remove);
* 2. 字符设备的struct file_operations成员函数.
****************************************/
/* 指明该驱动程序适用于哪一些PCI设备 */
static struct pci_device_id xxx_pci_tbl[] __initdata = {
{PCI_VENDOR_ID_DEMO, PCI_DEVICE_ID_DEMO, PCI_ANY_ID, PCI_ANY_ID, 0, 0, DEMO},
{0, }
};
/* 中断处理函数 */
static void xxx_interrupt(int irqno, void *dev_id)
{
...
}
/* char设备struct file_operations open成员函数*/
static int xxx_open(struct inode *inode, struct file *filp)
{
/* 申请中断,注册中断处理程序 */
request_irq(xxx_irq, &xxx_interrupt, ...);
...
}
/* 字符设备struct file_operations ioctl成员函数 */
static int xxx_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg)
{
...
}
... /* 字符设备struct file_operations read、write、mmap等成员函数 */
/* 设备文件操作接口 */
static struct file_operations xxx_fops = {
owner: THIS_MODULE,
read: xxx_read,
write: xxx_write,
ioctl: xxx_ioctl,
mmap: xxx_mmap,
open: xxx_open,
release: xxx_release,
/* ... */
};
/* struct pci_driver的probe成员函数 */
static int __init xxx_probe(struct pci_dev *pci_dev, const struct pci_device_id *pci_id)
{
pci_enable_device(pci_dev); /* 启动PCI设备 */
/* 读取PCI配置信息 */
iobase = pci_resource_start(pci_dev, 1);
ioend = pci_resource_end(pci_dev, 1);
ioflags = pci_resource_flags(pci_dev, 1);
iolen = pci_resource_len(pci_dev, 1);
...
pci_set_master(pci_dev); /* 设置成总线主DMA模式*/
pci_register_regions(pci_dev); /* 申请I/O资源 */
/* 注册字符设备 */
cdev_init(xxx_cdev, &xxx_fops);
register_chrdev_region(xxx_dev_no, 1, ...);
cdev_add(xxx_cdev);
return 0;
}
/* struct pci_driver的remove成员函数 */
static int __init xxx_release(struct pci_dev *pdev)
{
pci_release_regions(pdev); /* 释放I/O资源 */
pci_disable_device(pdev); /* 禁止PCI设备 */
unregister_chrdev_region(xxx_dev_no, 1); /* 释放占用的设备号 */
cdev_del(&xxx_dev.cdev); /* 注销字符设备 */
...
return 0;
}
/* 设备模块信息 */
static struct pci_driver xxx_pci_driver = {
name: xxx_MODULE_NAME,
id_table: xxx_pci_tbl,
probe: xxx_probe,
remove: xxx_remove
};
static int __init xxx_init_module(void)
{
pci_register_driver(&xxx_pci_driver);
}
static void __init xxx_cleanup_module(void)
{
pci_unregister_driver(&xxx_pci_driver);
}
module_init(xxx_init_module);
moduel_exit(xxx_cleanup_module);
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