| // SPDX-License-Identifier: ISC |
| /* Copyright (C) 2020 Felix Fietkau <nbd@nbd.name> */ |
| #define _GNU_SOURCE |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <fcntl.h> |
| #include <errno.h> |
| |
| #include "mt76-test.h" |
| |
| static const char *mtd_part; |
| static uint32_t mtd_offset; |
| |
| static char *eeprom_file; |
| static int eeprom_fd = -1; |
| unsigned char *eeprom_data; |
| |
| static int mt76_eeprom_dump_cb(struct nl_msg *msg, void *arg) |
| { |
| struct nlattr *tb[NUM_MT76_TM_ATTRS]; |
| struct nlattr *attr; |
| |
| attr = unl_find_attr(&unl, msg, NL80211_ATTR_TESTDATA); |
| if (!attr) |
| return NL_SKIP; |
| |
| nla_parse_nested(tb, MT76_TM_ATTR_MAX, attr, msg_field.policy); |
| if (!tb[MT76_TM_ATTR_MTD_PART] || !tb[MT76_TM_ATTR_MTD_OFFSET]) |
| return NL_SKIP; |
| |
| mtd_part = strdup(nla_get_string(tb[MT76_TM_ATTR_MTD_PART])); |
| mtd_offset = nla_get_u32(tb[MT76_TM_ATTR_MTD_OFFSET]); |
| |
| return NL_SKIP; |
| } |
| |
| static FILE *mtd_open(const char *mtd) |
| { |
| char line[128], name[64]; |
| FILE *fp; |
| int i; |
| |
| fp = fopen("/proc/mtd", "r"); |
| if (!fp) |
| return NULL; |
| |
| snprintf(name, sizeof(name), "\"%s\"", mtd); |
| while (fgets(line, sizeof(line), fp)) { |
| if (!sscanf(line, "mtd%d:", &i) || !strstr(line, name)) |
| continue; |
| |
| snprintf(line, sizeof(line), "/dev/mtd%d", i); |
| fclose(fp); |
| return fopen(line, "r"); |
| } |
| fclose(fp); |
| |
| return NULL; |
| } |
| |
| |
| static int |
| mt76_eeprom_create_file(void) |
| { |
| char buf[1024]; |
| ssize_t len; |
| FILE *f; |
| int fd; |
| |
| f = mtd_open(mtd_part); |
| if (!f) { |
| fprintf(stderr, "Failed to open MTD device\n"); |
| return -1; |
| } |
| |
| fd = open(eeprom_file, O_RDWR | O_CREAT | O_EXCL, 00644); |
| if (fd < 0) |
| goto out; |
| |
| while ((len = fread(buf, 1, sizeof(buf), f)) > 0) { |
| ssize_t w; |
| |
| retry: |
| w = write(fd, buf, len); |
| if (w > 0) |
| continue; |
| |
| if (errno == EINTR) |
| goto retry; |
| |
| perror("write"); |
| unlink(eeprom_file); |
| close(fd); |
| fd = -1; |
| goto out; |
| } |
| |
| lseek(fd, 0, SEEK_SET); |
| |
| out: |
| fclose(f); |
| return fd; |
| } |
| |
| static bool |
| mt76_eeprom_file_exists(void) |
| { |
| struct stat st; |
| |
| return stat(eeprom_file, &st) == 0; |
| } |
| |
| static int |
| mt76_eeprom_init_file(void) |
| { |
| int fd; |
| |
| if (!mt76_eeprom_file_exists()) |
| return mt76_eeprom_create_file(); |
| |
| fd = open(eeprom_file, O_RDWR); |
| if (fd < 0) |
| perror("open"); |
| |
| return fd; |
| } |
| |
| int mt76_eeprom_init(int phy) |
| { |
| struct nl_msg *msg; |
| |
| msg = unl_genl_msg(&unl, NL80211_CMD_TESTMODE, true); |
| nla_put_u32(msg, NL80211_ATTR_WIPHY, phy); |
| unl_genl_request(&unl, msg, mt76_eeprom_dump_cb, NULL); |
| |
| if (!mtd_part) { |
| fprintf(stderr, "Could not find MTD partition information\n"); |
| return -1; |
| } |
| |
| eeprom_file = malloc(sizeof(EEPROM_FILE_PATH_FMT) + strlen(mtd_part)); |
| sprintf(eeprom_file, EEPROM_FILE_PATH_FMT, mtd_part); |
| |
| eeprom_fd = mt76_eeprom_init_file(); |
| if (eeprom_fd < 0) |
| return -1; |
| |
| eeprom_data = mmap(NULL, EEPROM_PART_SIZE, PROT_READ | PROT_WRITE, |
| MAP_SHARED, eeprom_fd, mtd_offset); |
| if (!eeprom_data) { |
| perror("mmap"); |
| close(eeprom_fd); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| void mt76_eeprom_close(void) |
| { |
| if (eeprom_fd < 0) |
| return; |
| |
| msync(eeprom_data, EEPROM_PART_SIZE, MS_SYNC); |
| munmap(eeprom_data, EEPROM_PART_SIZE); |
| close(eeprom_fd); |
| eeprom_fd = -1; |
| } |
| |
| static int |
| mt76_eeprom_set(int argc, char **argv) |
| { |
| for (; argc > 0; argc--, argv++) { |
| char *addr_str = argv[0]; |
| char *val_str = strchr(addr_str, '='); |
| unsigned long addr, val; |
| char *err; |
| |
| if (!val_str) { |
| fprintf(stderr, "Invalid argument: %s\n", addr_str); |
| return 1; |
| } |
| |
| *(val_str++) = 0; |
| |
| addr = strtoul(addr_str, &err, 0); |
| if ((err && *err) || addr >= EEPROM_PART_SIZE) { |
| fprintf(stderr, "Invalid address: %s\n", addr_str); |
| return 1; |
| } |
| |
| val = strtoul(val_str, &err, 0); |
| if ((err && *err) || val >= 0xff) { |
| fprintf(stderr, "Invalid value: %s\n", val_str); |
| return 1; |
| } |
| |
| eeprom_data[addr] = val; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| mt76_eeprom_changes(void) |
| { |
| unsigned char *buf; |
| FILE *f; |
| int i; |
| |
| f = mtd_open(mtd_part); |
| if (!f) { |
| fprintf(stderr, "Cannot open MTD device\n"); |
| return 1; |
| } |
| |
| buf = malloc(EEPROM_PART_SIZE); |
| fseek(f, mtd_offset, SEEK_SET); |
| fread(buf, 1, EEPROM_PART_SIZE, f); |
| for (i = 0; i < EEPROM_PART_SIZE; i++) { |
| if (buf[i] == eeprom_data[i]) |
| continue; |
| |
| printf("[%04x] %02x => %02x\n", i, buf[i], eeprom_data[i]); |
| } |
| free(buf); |
| |
| return 0; |
| } |
| |
| |
| int mt76_eeprom(int phy, int argc, char **argv) |
| { |
| const char *cmd; |
| int ret = 0; |
| |
| if (argc < 1) |
| usage(); |
| |
| if (mt76_eeprom_init(phy)) |
| return 1; |
| |
| cmd = argv[0]; |
| argv++; |
| argc--; |
| |
| if (!strcmp(cmd, "file")) |
| printf("%s\n", eeprom_file); |
| else if (!strcmp(cmd, "set")) |
| ret = mt76_eeprom_set(argc, argv); |
| else if (!strcmp(cmd, "reset")) |
| unlink(eeprom_file); |
| else if (!strcmp(cmd, "changes")) |
| ret = mt76_eeprom_changes(); |
| |
| mt76_eeprom_close(); |
| |
| return ret; |
| } |