1 | /* vi: set sw=4 ts=4: */
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2 | /* Ported to busybox from mtd-utils.
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3 | *
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4 | * Licensed under GPLv2, see file LICENSE in this source tree.
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5 | */
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6 |
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7 | //usage:#define flash_lock_trivial_usage
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8 | //usage: "MTD_DEVICE OFFSET SECTORS"
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9 | //usage:#define flash_lock_full_usage "\n\n"
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10 | //usage: "Lock part or all of an MTD device. If SECTORS is -1, then all sectors\n"
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11 | //usage: "will be locked, regardless of the value of OFFSET"
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12 | //usage:
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13 | //usage:#define flash_unlock_trivial_usage
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14 | //usage: "MTD_DEVICE"
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15 | //usage:#define flash_unlock_full_usage "\n\n"
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16 | //usage: "Unlock an MTD device"
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17 |
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18 | #include "libbb.h"
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19 | #include <mtd/mtd-user.h>
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20 |
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21 | int flash_lock_unlock_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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22 | int flash_lock_unlock_main(int argc UNUSED_PARAM, char **argv)
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23 | {
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24 | /* note: fields in these structs are 32-bits.
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25 | * apparently we can't win anything by using off_t
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26 | * or long long's for offset and/or sectors vars. */
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27 | struct mtd_info_user info;
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28 | struct erase_info_user lock;
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29 | unsigned long offset;
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30 | long sectors;
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31 | int fd;
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32 |
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33 | #define do_lock (ENABLE_FLASH_LOCK && (!ENABLE_FLASH_UNLOCK || (applet_name[6] == 'l')))
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34 |
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35 | if (!argv[1])
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36 | bb_show_usage();
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37 |
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38 | /* parse offset and number of sectors to lock */
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39 | offset = 0;
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40 | sectors = -1;
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41 | if (do_lock) {
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42 | if (!argv[2] || !argv[3])
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43 | bb_show_usage();
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44 | offset = xstrtoul(argv[2], 0);
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45 | sectors = xstrtol(argv[3], 0);
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46 | }
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47 |
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48 | fd = xopen(argv[1], O_RDWR);
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49 |
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50 | xioctl(fd, MEMGETINFO, &info);
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51 |
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52 | lock.start = 0;
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53 | lock.length = info.size;
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54 | if (do_lock) {
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55 | unsigned long size = info.size - info.erasesize;
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56 | if (offset > size) {
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57 | bb_error_msg_and_die("%lx is beyond device size %lx\n",
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58 | offset, size);
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59 | }
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60 |
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61 | if (sectors == -1) {
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62 | sectors = info.size / info.erasesize;
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63 | } else {
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64 | // isn't this useless?
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65 | unsigned long num = info.size / info.erasesize;
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66 | if (sectors > num) {
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67 | bb_error_msg_and_die("%ld are too many "
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68 | "sectors, device only has "
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69 | "%ld\n", sectors, num);
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70 | }
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71 | }
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72 |
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73 | lock.start = offset;
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74 | lock.length = sectors * info.erasesize;
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75 | xioctl(fd, MEMLOCK, &lock);
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76 | } else {
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77 | xioctl(fd, MEMUNLOCK, &lock);
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78 | }
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79 |
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80 | return EXIT_SUCCESS;
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81 | }
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