diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2017-09-23 10:30:24 +0100 |
|---|---|---|
| committer | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2025-09-29 10:21:43 +0100 |
| commit | 3e025ed07352570f5480cbdab4c75253f2d7c7c7 (patch) | |
| tree | 980cac9c983f2b3f53947255a16853ef8993f759 | |
| parent | e5f0a698b34ed76002dc5cff3804a61c80233a7a (diff) | |
rtc: export RTC setting offset via sysfs
Export the RTC time set offset via sysfs so the value can be read and
tweaked as necessary. This is useful when determining the correct
setting for a RTC, as it eliminates the need to rebuild/install/reboot
from the test cycle.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
| -rw-r--r-- | drivers/rtc/sysfs.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/rtc/sysfs.c b/drivers/rtc/sysfs.c index 4ab05e105a76..787770cfa61b 100644 --- a/drivers/rtc/sysfs.c +++ b/drivers/rtc/sysfs.c @@ -240,6 +240,31 @@ offset_store(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR_RW(offset); static ssize_t +set_offset_nsec_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return sprintf(buf, "%ld\n", to_rtc_device(dev)->set_offset_nsec); +} + +static ssize_t +set_offset_nsec_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t n) +{ + struct rtc_device *rtc = to_rtc_device(dev); + long val; + int err; + + err = kstrtol(buf, 0, &val); + if (err) + return err; + + rtc->set_offset_nsec = val; + + return n; +} +static DEVICE_ATTR_RW(set_offset_nsec); + +static ssize_t range_show(struct device *dev, struct device_attribute *attr, char *buf) { return sysfs_emit(buf, "[%lld,%llu]\n", to_rtc_device(dev)->range_min, @@ -256,6 +281,7 @@ static struct attribute *rtc_attrs[] = { &dev_attr_hctosys.attr, &dev_attr_wakealarm.attr, &dev_attr_offset.attr, + &dev_attr_set_offset_nsec.attr, &dev_attr_range.attr, NULL, }; |