07_mdioLinux内核模块

01_basicLinux内核模块-CSDN博客文章浏览阅读316次，点赞3次，收藏3次。环境ID=ubuntuMakefilemodules:clean:basic.creturn 0;运行效果。https://blog.csdn.net/m0_37132481/article/details/136157384my_mdio.c

#include <linux/kernel.h>
#include <linux/module.h>#include <linux/mii.h>
#include <linux/phy.h>#define TAG "HELLO# "static int my_phy_device_addr = 6;
static struct mii_bus *mii_bus = NULL;static int my_mdiobus_read(struct mii_bus *bus, int phy_addr, int regnum)
{int regdata = 0xffff;/* assume we have a phy here */if(phy_addr == my_phy_device_addr){switch(regnum){case 0x2:regdata = 0x1234;break;case 0x3:regdata = 0x0056;break;default:/* nothing to do */break;}}else{/* nothing to do */}return regdata;
}static int my_mdiobus_write(struct mii_bus *bus, int phy_addr, int regnum, u16 value)
{printk(TAG "%s called\n", __func__);return 0;
}static int my_mdiobus_reset(struct mii_bus *bus)
{printk(TAG "%s called\n", __func__);return 0;
}static int my_mdiodev_init(void)
{printk(TAG "%s called\n", __func__);mii_bus = mdiobus_alloc();mii_bus->read = my_mdiobus_read;mii_bus->write = my_mdiobus_write;mii_bus->reset = my_mdiobus_reset;mii_bus->name = "my_mdiodev_mii";snprintf(mii_bus->id, MII_BUS_ID_SIZE, "my_mdiobus");mdiobus_register(mii_bus);/* check if mii scan and found my_phy_device */struct mdio_device *mdiodev = mii_bus->mdio_map[my_phy_device_addr];if(!mdiodev){/* nothing to do */}else{printk(TAG "found phy device, address %d\n", mdiodev->addr);}return 0;
}
static void my_mdiodev_exit(void)
{printk(TAG "%s called\n", __func__);mdiobus_unregister(mii_bus);mdiobus_free(mii_bus);
}module_init(my_mdiodev_init);
module_exit(my_mdiodev_exit);
MODULE_LICENSE("GPL");

效果