rtc: add boot_timesource sysfs attribute

CONFIG_RTC_HCTOSYS allows the kernel to read the system time from the RTC
at boot and resume, avoiding the need for userspace to do so.
Unfortunately userspace currently has no way to know whether this
configuration option is enabled and thus cannot sensibly choose whether to
run hwclock itself or not.  Add a hctosys sysfs attribute which indicates
whether a given RTC set the system clock.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 16 insertions, 0 deletions

diff --git a/Documentation/rtc.txt b/Documentation/rtc.txt
index 2745e8197fde..9104c1062084 100644
--- a/Documentation/rtc.txt
+++ b/Documentation/rtc.txt
@@ -143,6 +143,8 @@ rtc attributes without requiring the use of ioctls. All dates and times
 are in the RTC's timezone, rather than in system time.
 
 date:            RTC-provided date
+hctosys:         1 if the RTC provided the system time at boot via the
+                 CONFIG_RTC_HCTOSYS kernel option, 0 otherwise
 max_user_freq:   The maximum interrupt rate an unprivileged user may request
                  from this RTC.
 name:            The name of the RTC corresponding to this sysfs directory
diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
index 2531ce4c9db0..7dd23a6fc825 100644
--- a/drivers/rtc/rtc-sysfs.c
+++ b/drivers/rtc/rtc-sysfs.c
@@ -102,6 +102,19 @@ rtc_sysfs_set_max_user_freq(struct device *dev, struct device_attribute *attr,
         return n;
 }
 
+static ssize_t
+rtc_sysfs_show_hctosys(struct device *dev, struct device_attribute *attr,
+                char *buf)
+{
+#ifdef CONFIG_RTC_HCTOSYS_DEVICE
+        if (strcmp(dev_name(&to_rtc_device(dev)->dev),
+                   CONFIG_RTC_HCTOSYS_DEVICE) == 0)
+                return sprintf(buf, "1\n");
+        else
+#endif
+                return sprintf(buf, "0\n");
+}
+
 static struct device_attribute rtc_attrs[] = {
         __ATTR(name, S_IRUGO, rtc_sysfs_show_name, NULL),
         __ATTR(date, S_IRUGO, rtc_sysfs_show_date, NULL),
@@ -109,6 +122,7 @@ static struct device_attribute rtc_attrs[] = {
         __ATTR(since_epoch, S_IRUGO, rtc_sysfs_show_since_epoch, NULL),
         __ATTR(max_user_freq, S_IRUGO | S_IWUSR, rtc_sysfs_show_max_user_freq,
                         rtc_sysfs_set_max_user_freq),
+        __ATTR(hctosys, S_IRUGO, rtc_sysfs_show_hctosys, NULL),
         { },
 };