linux 读 phy 寄存器

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/phy.h>

static int read_phy_register(struct net_device *dev, int regnum) {
    struct phy_device *phydev = dev->phydev;
    if (!phydev) {
        printk(KERN_ERR "PHY device not found\n");
        return -ENODEV;
    }
    return phy_read(phydev, regnum);
}

static int __init my_module_init(void) {
    struct net_device *dev = first_net_device(&init_net);
    if (dev) {
        int value = read_phy_register(dev, MII_BMCR);
        printk(KERN_INFO "PHY Register MII_BMCR value: %d\n", value);
    }
    return 0;
}

static void __exit my_module_exit(void) {
    printk(KERN_INFO "Module unloaded\n");
}

module_init(my_module_init);
module_exit(my_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PHY Register Reader");
MODULE_AUTHOR("Your Name");