diff options
Diffstat (limited to '')
| -rw-r--r-- | sys-utils/hwclock-rtc.c | 93 |
1 files changed, 92 insertions, 1 deletions
diff --git a/sys-utils/hwclock-rtc.c b/sys-utils/hwclock-rtc.c index 7094cd0..113d4e8 100644 --- a/sys-utils/hwclock-rtc.c +++ b/sys-utils/hwclock-rtc.c @@ -1,6 +1,11 @@ /* * SPDX-License-Identifier: GPL-2.0-or-later * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * * rtc.c - Use /dev/rtc for clock access */ #include <asm/ioctl.h> @@ -424,7 +429,7 @@ static int resolve_rtc_param_alias(const char *alias, __u64 *value) /* kernel uapi __u64 can be defined differently than uint64_t */ static int strtoku64(const char *str, __u64 *num, int base) { - return ul_strtou64(str, (uint64_t *) &num, base); + return ul_strtou64(str, (uint64_t *) num, base); } /* @@ -518,3 +523,89 @@ done: free(opt); return rc; } + +#ifndef RTC_VL_DATA_INVALID +#define RTC_VL_DATA_INVALID 0x1 +#endif +#ifndef RTC_VL_BACKUP_LOW +#define RTC_VL_BACKUP_LOW 0x2 +#endif +#ifndef RTC_VL_BACKUP_EMPTY +#define RTC_VL_BACKUP_EMPTY 0x4 +#endif +#ifndef RTC_VL_ACCURACY_LOW +#define RTC_VL_ACCURACY_LOW 0x8 +#endif +#ifndef RTC_VL_BACKUP_SWITCH +#define RTC_VL_BACKUP_SWITCH 0x10 +#endif + +int rtc_vl_read(const struct hwclock_control *ctl) +{ + unsigned int vl; + int rtc_fd; + size_t i; + static const struct vl_bit { + unsigned int bit; + const char *desc; + } vl_bits[] = { + { RTC_VL_DATA_INVALID, N_("Voltage too low, RTC data is invalid") }, + { RTC_VL_BACKUP_LOW, N_("Backup voltage is low") }, + { RTC_VL_BACKUP_EMPTY, N_("Backup empty or not present") }, + { RTC_VL_ACCURACY_LOW, N_("Voltage is low, RTC accuracy is reduced") }, + { RTC_VL_BACKUP_SWITCH, N_("Backup switchover happened") }, + }; + + rtc_fd = open_rtc(ctl); + if (rtc_fd < 0) { + warnx(_("cannot open %s"), rtc_dev_name); + return 1; + } + + if (ioctl(rtc_fd, RTC_VL_READ, &vl) == -1) { + warn(_("ioctl(%d, RTC_VL_READ) on %s failed"), + rtc_fd, rtc_dev_name); + return 1; + } + + if (ctl->verbose) { + printf(_("ioctl(%d, RTC_VL_READ) on %s returned 0x%x\n"), + rtc_fd, rtc_dev_name, vl); + } + + for (i = 0; i < ARRAY_SIZE(vl_bits); ++i) { + const struct vl_bit *vlb = &vl_bits[i]; + + if (vl & vlb->bit) { + printf("0x%02x - %s\n", vlb->bit, vlb->desc); + vl &= ~vlb->bit; + } + } + if (vl) + printf("0x%02x - unknown bit(s)\n", vl); + + return 0; +} + +int rtc_vl_clear(const struct hwclock_control *ctl) +{ + int rtc_fd; + + rtc_fd = open_rtc(ctl); + if (rtc_fd < 0) { + warnx(_("cannot open %s"), rtc_dev_name); + return 1; + } + + if (ioctl(rtc_fd, RTC_VL_CLR) == -1) { + warn(_("ioctl(%d, RTC_VL_CLEAR) on %s failed"), + rtc_fd, rtc_dev_name); + return 1; + } + + if (ctl->verbose) + printf(_("ioctl(%d, RTC_VL_CLEAR) on %s succeeded.\n"), + rtc_fd, rtc_dev_name); + + return 0; +} |