diff options
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-tps6586x.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-tps6586x.c b/drivers/rtc/rtc-tps6586x.c index 729d71ecc754..c74d7db832ef 100644 --- a/drivers/rtc/rtc-tps6586x.c +++ b/drivers/rtc/rtc-tps6586x.c @@ -40,6 +40,7 @@ #define RTC_ALARM1_HI 0xc1 #define RTC_COUNT4 0xc6 #define RTC_COUNT4_DUMMYREAD 0xc5 /* start a PMU RTC access by reading the register prior to the RTC_COUNT4 */ +#define ALM1_VALID_RANGE_IN_SEC 0x3FFF /*only 14-bits width in second*/ struct tps6586x_rtc { unsigned long epoch_start; @@ -133,8 +134,11 @@ static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) struct device *tps_dev = to_tps6586x_dev(dev); unsigned long seconds; unsigned long ticks; + unsigned long long rticks = 0; u8 buff[3]; + u8 rbuff[6]; int err; + int i; if (rtc->irq == -1) return -EIO; @@ -155,6 +159,22 @@ static int tps6586x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) } seconds -= rtc->epoch_start; + + if (seconds > ALM1_VALID_RANGE_IN_SEC) { + err = tps6586x_reads(tps_dev, RTC_COUNT4_DUMMYREAD, sizeof(rbuff), rbuff); + if (err < 0) { + dev_err(dev, "failed to read counter\n"); + return err; + } + + for (i = 1; i < sizeof(rbuff); i++) { + rticks <<= 8; + rticks |= rbuff[i]; + } + + seconds = (rticks >> 10) - 1; + } + ticks = (unsigned long long)seconds << 10; buff[0] = (ticks >> 16) & 0xff; |