Messages in this thread Patch in this message | | | Date | Mon, 6 Aug 2007 21:01:54 +0200 | From | Alessandro Zummo <> | Subject | Re: [rtc-linux] Re: rtc max frequency setting |
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On Sat, 04 Aug 2007 17:06:38 -0700 "H. Peter Anvin" <hpa@zytor.com> 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), { }, };
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Best regards,
Alessandro Zummo, Tower Technologies - Torino, Italy
http://www.towertech.it
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