From 41afca166c28e4056e9e859102660d1b1df6aa38 Mon Sep 17 00:00:00 2001 From: Russell King Date: Sat, 23 Sep 2017 10:30:24 +0100 Subject: 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 --- drivers/rtc/sysfs.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'drivers') diff --git a/drivers/rtc/sysfs.c b/drivers/rtc/sysfs.c index e3062c4d3f2c..2255e7c3da71 100644 --- a/drivers/rtc/sysfs.c +++ b/drivers/rtc/sysfs.c @@ -243,6 +243,31 @@ 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) { @@ -260,6 +285,7 @@ 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, }; -- cgit