1 | /*
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2 | * mii-reg.c - Tim Harvey <tharvey@gateworks.com>
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3 | *
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4 | * Simple example of how to read/write MII registers using
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5 | * SIOCGMIIREG/SIOCSMIIREG ioctl
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6 | *
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7 | * Note that your network device driver must support mdio_read/mdio_write
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8 | *
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9 | * Usage:
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10 | * mii-reg <iface> <reg> [<value>]
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11 | *
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12 | */
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13 |
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14 | #include <errno.h>
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15 | #include <stdio.h>
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16 | #include <stdlib.h>
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17 | #include <string.h>
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18 | #include <unistd.h>
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19 |
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20 | #include <sys/socket.h>
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21 | #include <sys/ioctl.h>
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22 | #include <net/if.h>
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23 | #include <linux/mii.h>
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24 | #include <linux/sockios.h>
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25 |
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26 | int main(int argc, char **argv)
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27 | {
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28 | char *iface;
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29 | int sock;
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30 | struct ifreq ifr;
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31 | struct mii_ioctl_data *mii = (struct mii_ioctl_data*)(&ifr.ifr_data);
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32 | int reg;
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33 |
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34 | if (argc < 3) {
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35 | fprintf(stderr, "Usage: %s <iface> <reg> [<value>]\n",
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36 | argv[0]);
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37 | exit(1);
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38 | }
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39 | iface = argv[1];
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40 | reg = strtol(argv[2], NULL, 0);
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41 |
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42 | /* open socket */
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43 | sock = socket(AF_INET, SOCK_DGRAM, 0);
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44 | if (sock < 0) {
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45 | perror("socket");
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46 | exit(1);
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47 | }
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48 |
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49 | /* get the details of the iface */
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50 | memset(&ifr, 0, sizeof(ifr));
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51 | strncpy(ifr.ifr_name, iface, IFNAMSIZ);
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52 | if (ioctl(sock, SIOCGMIIPHY, &ifr) < 0) {
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53 | perror("SIOCGMIIPHY");
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54 | exit(1);
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55 | }
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56 |
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57 | mii->reg_num = reg;
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58 | if (argc > 3) {
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59 | mii->val_in = strtol(argv[3], NULL, 0);
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60 | if (ioctl(sock, SIOCSMIIREG, &ifr) < 0) {
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61 | perror("SIOCSMIIREG");
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62 | exit(1);
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63 | }
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64 | }
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65 | mii->val_in = 0;
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66 | mii->val_out = 0;
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67 | if (ioctl(sock, SIOCGMIIREG, &ifr) < 0) {
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68 | perror("SIOCGMIIREG");
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69 | exit(1);
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70 | }
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71 | printf("%s phyid=0x%02x reg=0x%02x val=0x%04x\n",
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72 | iface, mii->phy_id, mii->reg_num, mii->val_out);
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73 |
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74 | /* read */
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75 | close(sock);
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76 |
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77 | return 0;
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78 | }
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