On Sat, 04 Aug 2007 17:06:38 -0700
"H. Peter Anvin" <[email protected]> wrote:
>
> Jan Engelhardt wrote:
> > Hi,
> >
> > with the old rtc.ko module, there was a /proc/sys/dev/rtc/max-user-freq
> > that could be set. With rtc_cmos.ko (or the new rtc infrastructure in
> > general), I am missing this file. Where can I set the max-user-freq now,
> > or is this obsolete now? (mplayer prefers to have user-freq to be >= 1024.)
> >
quick hack to set the maximum freq. I haven't tested t, just compiled.
I'm not sure about simple_strtoul.
please provide feedback ;)
---
drivers/rtc/rtc-sysfs.c | 27 ++++++++++++++++++++++++++-
1 file changed, 26 insertions(+), 1 deletion(-)
--- linux-2.6.orig/drivers/rtc/rtc-sysfs.c 2007-08-06 20:34:12.000000000 +0200
+++ linux-2.6/drivers/rtc/rtc-sysfs.c 2007-08-06 20:50:03.000000000 +0200
@@ -73,11 +73,37 @@ rtc_sysfs_show_since_epoch(struct device
return retval;
}
+static ssize_t
+rtc_sysfs_show_max_user_freq(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct rtc_device *rtc = to_rtc_device(dev);
+ return sprintf(buf, "%d\n", rtc->max_user_freq);
+}
+
+static ssize_t
+rtc_sysfs_set_max_user_freq(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t n)
+{
+ unsigned long w;
+ struct rtc_device *rtc = to_rtc_device(dev);
+
+ w = simple_strtoul(buf, NULL, 0);
+ if (is_power_of_2(w)) {
+ rtc->max_user_freq = w;
+ return n;
+ }
+
+ return -EINVAL;
+}
+
static struct device_attribute rtc_attrs[] = {
__ATTR(name, S_IRUGO, rtc_sysfs_show_name, NULL),
__ATTR(date, S_IRUGO, rtc_sysfs_show_date, NULL),
__ATTR(time, S_IRUGO, rtc_sysfs_show_time, NULL),
__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),
{ },
};
--
Best regards,
Alessandro Zummo,
Tower Technologies - Torino, Italy
http://www.towertech.it
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