include <stdio.h>

include <stdlib.h>

include <string.h>

include <linux/mii.h>

include <sys/types.h>

include <sys/socket.h>

include <sys/ioctl.h>

include <net/if.h>

include <linux/sockios.h>

include <linux/types.h>

include <netinet/in.h>

define reteck(ret) \

    if(ret < 0){    \
        printf("%m! \"%s\" : line: %d\n", __func__, __LINE__);   \
        goto lab;   \
    }

define help() \

printf("mdio:\n");                  \
printf("read operation: mdio reg_addr\n");          \
printf("write operation: mdio reg_addr value\n");    \
printf("For example:\n");            \
printf("mdio eth0 1\n");             \
printf("mdio eth0 0 0x12\n\n");      \
exit(0);

int sockfd;

int main(int argc, char *argv[]){

    
if(argc == 1 || !strcmp(argv[1], "-h")){
    help();
}

struct mii_ioctl_data *mii = NULL;
struct ifreq ifr;
int ret;

memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, argv[1], IFNAMSIZ - 1);

sockfd = socket(PF_LOCAL, SOCK_DGRAM, 0);
reteck(sockfd);

//get phy address in smi bus
ret = ioctl(sockfd, SIOCGMIIPHY, &ifr);
reteck(ret);

mii = (struct mii_ioctl_data*)&ifr.ifr_data;

if(argc == 3){

    mii->reg_num    = (uint16_t)strtoul(argv[2], NULL, 0);
    
    ret = ioctl(sockfd, SIOCGMIIREG, &ifr);
    reteck(ret);

    printf("read phy addr: 0x%x  reg: 0x%x   value : 0x%x\n\n", mii->phy_id, mii->reg_num, mii->val_out);
}else if(argc == 4){

    mii->reg_num    = (uint16_t)strtoul(argv[2], NULL, 0);
    mii->val_in     = (uint16_t)strtoul(argv[3], NULL, 0);

    ret = ioctl(sockfd, SIOCSMIIREG, &ifr);
    reteck(ret);

    printf("write phy addr: 0x%x  reg: 0x%x  value : 0x%x\n\n", mii->phy_id, mii->reg_num, mii->val_in);
}

lab:

close(sockfd);
return 0;

}