linux驱动 地址上写数据

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/io.h>

static void write_to_pci_address(struct pci_dev *pdev, unsigned long offset, u32 value) {
    void __iomem *addr;

    addr = pci_iomap(pdev, 0, 0);
    if (!addr) {
        printk(KERN_ERR "Failed to iomap PCI address\n");
        return;
    }

    writel(value, addr + offset);
    pci_iounmap(pdev, addr);
}

static int __init my_driver_init(void) {
    struct pci_dev *pdev;

    pdev = pci_get_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82545EM, NULL);
    if (!pdev) {
        printk(KERN_ERR "PCI device not found\n");
        return -ENODEV;
    }

    write_to_pci_address(pdev, 0x10, 0xDEADBEEF);

    pci_dev_put(pdev);
    return 0;
}

static void __exit my_driver_exit(void) {
    printk(KERN_INFO "Driver unloaded\n");
}

module_init(my_driver_init);
module_exit(my_driver_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple PCI device driver example");