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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2020-05-05 22:09:58 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2020-05-05 22:09:58 +0200 |
| commit | d3f6e86ccdda179fb3ea1b82f962f435148599d1 (patch) | |
| tree | 27088bb751a35a9996b29b57460e02875f1e1c6a | |
| parent | 440f08b49b14e475faea3f6d54a01bc837e97a6b (diff) | |
| download | rtc-tools-d3f6e86ccdda179fb3ea1b82f962f435148599d1.tar.gz | |
rtc: add support for voltages flags
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| -rw-r--r-- | rtc.c | 19 |
1 files changed, 19 insertions, 0 deletions
@@ -7,6 +7,7 @@ #include <errno.h> #include <fcntl.h> +#include <linux/const.h> #include <linux/rtc.h> #include <stdio.h> #include <stdlib.h> @@ -19,6 +20,14 @@ static char *rtc_file = "/dev/rtc0"; +#ifndef RTC_VL_DATA_INVALID +#define RTC_VL_DATA_INVALID _BITUL(0) /* Voltage too low, RTC data is invalid */ +#define RTC_VL_BACKUP_LOW _BITUL(1) /* Backup voltage is low */ +#define RTC_VL_BACKUP_EMPTY _BITUL(2) /* Backup empty or not present */ +#define RTC_VL_ACCURACY_LOW _BITUL(3) /* Voltage is low, RTC accuracy is reduced */ +#define RTC_VL_BACKUP_SWITCH _BITUL(4) /* Backup switchover happened */ +#endif + #define IOCTL(f, r, d, rc) rc = ioctl(f, r, d); \ if (rc) { \ fprintf(stderr, "%s returned %s (%d) at line %d\n", #r, \ @@ -163,6 +172,16 @@ int main(int argc, char **argv) case RTC_VL_READ: IOCTL(fd, RTC_VL_READ, &flags, rc); printf("%s: voltage low flags: %x\n", rtc_file, flags); + if (flags & RTC_VL_DATA_INVALID) + printf("Voltage too low, RTC data is invalid\n"); + if (flags & RTC_VL_BACKUP_LOW) + printf("Backup voltage is low\n"); + if (flags & RTC_VL_BACKUP_EMPTY) + printf("Backup empty or not present\n"); + if (flags & RTC_VL_ACCURACY_LOW) + printf("Voltage is low, RTC accuracy is reduced\n"); + if (flags & RTC_VL_BACKUP_SWITCH) + printf("Backup switchover happened\n"); break; case RTC_VL_CLR: IOCTL(fd, RTC_VL_CLR, 0, rc); |