cregit-Linux how code gets into the kernel

Release 4.7 drivers/rtc/rtc-sysfs.c

Directory: drivers/rtc
/*
 * RTC subsystem, sysfs interface
 *
 * Copyright (C) 2005 Tower Technologies
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/module.h>
#include <linux/rtc.h>

#include "rtc-core.h"


/* device attributes */

/*
 * NOTE:  RTC times displayed in sysfs use the RTC's timezone.  That's
 * ideally UTC.  However, PCs that also boot to MS-Windows normally use
 * the local time and change to match daylight savings time.  That affects
 * attributes including date, time, since_epoch, and wakealarm.
 */



static ssize_t

name_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%s\n", to_rtc_device(dev)->name);
}

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alessandro zummoalessandro zummo2880.00%133.33%


david brownelldavid brownell617.14%133.33%


greg kroah-hartmangreg kroah-hartman12.86%133.33%


Total35100.00%3100.00%



static DEVICE_ATTR_RO(name);



static ssize_t

date_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ssize_t retval;
	struct rtc_time tm;

	retval = rtc_read_time(to_rtc_device(dev), &tm);
	if (retval == 0) {
		retval = sprintf(buf, "%04d-%02d-%02d\n",
			tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
	}

	return retval;
}

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alessandro zummoalessandro zummo6686.84%125.00%


david brownelldavid brownell911.84%250.00%


greg kroah-hartmangreg kroah-hartman11.32%125.00%


Total76100.00%4100.00%



static DEVICE_ATTR_RO(date);



static ssize_t

time_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ssize_t retval;
	struct rtc_time tm;

	retval = rtc_read_time(to_rtc_device(dev), &tm);
	if (retval == 0) {
		retval = sprintf(buf, "%02d:%02d:%02d\n",
			tm.tm_hour, tm.tm_min, tm.tm_sec);
	}

	return retval;
}

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alessandro zummoalessandro zummo6286.11%125.00%


david brownelldavid brownell912.50%250.00%


greg kroah-hartmangreg kroah-hartman11.39%125.00%


Total72100.00%4100.00%



static DEVICE_ATTR_RO(time);



static ssize_t

since_epoch_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ssize_t retval;
	struct rtc_time tm;

	retval = rtc_read_time(to_rtc_device(dev), &tm);
	if (retval == 0) {
		unsigned long time;
		rtc_tm_to_time(&tm, &time);
		retval = sprintf(buf, "%lu\n", time);
	}

	return retval;
}

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alessandro zummoalessandro zummo6586.67%125.00%


david brownelldavid brownell912.00%250.00%


greg kroah-hartmangreg kroah-hartman11.33%125.00%


Total75100.00%4100.00%



static DEVICE_ATTR_RO(since_epoch);



static ssize_t

max_user_freq_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "%d\n", to_rtc_device(dev)->max_user_freq);
}


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bryan kadzbanbryan kadzban3497.14%150.00%


greg kroah-hartmangreg kroah-hartman12.86%150.00%


Total35100.00%2100.00%





static ssize_t

max_user_freq_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t n)
{
	struct rtc_device *rtc = to_rtc_device(dev);
	unsigned long val;
	int err;

	err = kstrtoul(buf, 0, &val);
	if (err)
		return err;

	if (val >= 4096 || val == 0)
		return -EINVAL;

	rtc->max_user_freq = (int)val;

	return n;
}

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bryan kadzbanbryan kadzban6777.91%133.33%


labbe corentinlabbe corentin1820.93%133.33%


greg kroah-hartmangreg kroah-hartman11.16%133.33%


Total86100.00%3100.00%



static DEVICE_ATTR_RW(max_user_freq);

/**
 * rtc_sysfs_show_hctosys - indicate if the given RTC set the system time
 *
 * Returns 1 if the system clock was set by this RTC at the last
 * boot or resume event.
 */


static ssize_t

hctosys_show(struct device *dev, struct device_attribute *attr, char *buf)
{
#ifdef CONFIG_RTC_HCTOSYS_DEVICE
	if (rtc_hctosys_ret == 0 &&
			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");
}

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uwe kleine-koeniguwe kleine-koenig46.06%133.33%


greg kroah-hartmangreg kroah-hartman11.52%133.33%


Total66100.00%3100.00%



static DEVICE_ATTR_RO(hctosys);



static ssize_t

wakealarm_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ssize_t retval;
	unsigned long alarm;
	struct rtc_wkalrm alm;

	/* Don't show disabled alarms.  For uniformity, RTC alarms are
         * conceptually one-shot, even though some common RTCs (on PCs)
         * don't actually work that way.
         *
         * NOTE: RTC implementations where the alarm doesn't match an
         * exact YYYY-MM-DD HH:MM[:SS] date *must* disable their RTC
         * alarms after they trigger, to ensure one-shot semantics.
         */
	retval = rtc_read_alarm(to_rtc_device(dev), &alm);
	if (retval == 0 && alm.enabled) {
		rtc_tm_to_time(&alm.time, &alarm);
		retval = sprintf(buf, "%lu\n", alarm);
	}

	return retval;
}


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dmitry torokhovdmitry torokhov11.22%120.00%


Total82100.00%5100.00%





static ssize_t

wakealarm_store(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t n)
{
	ssize_t retval;
	unsigned long now, alarm;
	unsigned long push = 0;
	struct rtc_wkalrm alm;
	struct rtc_device *rtc = to_rtc_device(dev);
	char *buf_ptr;
	int adjust = 0;

	/* Only request alarms that trigger in the future.  Disable them
         * by writing another time, e.g. 0 meaning Jan 1 1970 UTC.
         */
	retval = rtc_read_time(rtc, &alm.time);
	if (retval < 0)
		return retval;
	rtc_tm_to_time(&alm.time, &now);

	buf_ptr = (char *)buf;
	if (*buf_ptr == '+') {
		buf_ptr++;
		if (*buf_ptr == '=') {
			buf_ptr++;
			push = 1;
		} else
			adjust = 1;
	}
	retval = kstrtoul(buf_ptr, 0, &alarm);
	if (retval)
		return retval;
	if (adjust) {
		alarm += now;
	}
	if (alarm > now || push) {
		/* Avoid accidentally clobbering active alarms; we can't
                 * entirely prevent that here, without even the minimal
                 * locking from the /dev/rtcN api.
                 */
		retval = rtc_read_alarm(rtc, &alm);
		if (retval < 0)
			return retval;
		if (alm.enabled) {
			if (push) {
				rtc_tm_to_time(&alm.time, &push);
				alarm += push;
			} else
				return -EBUSY;
		} else if (push)
			return -EINVAL;
		alm.enabled = 1;
	} else {
		alm.enabled = 0;

		/* Provide a valid future alarm time.  Linux isn't EFI,
                 * this time won't be ignored when disabling the alarm.
                 */
		alarm = now + 300;
	}
	rtc_time_to_tm(alarm, &alm.time);

	retval = rtc_set_alarm(rtc, &alm);
	return (retval < 0) ? retval : n;
}

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bernie thompsonbernie thompson5819.93%114.29%


yakui zhaoyakui zhao4415.12%114.29%


labbe corentinlabbe corentin124.12%114.29%


dmitry torokhovdmitry torokhov10.34%114.29%


Total291100.00%7100.00%



static DEVICE_ATTR_RW(wakealarm);



static ssize_t

offset_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	ssize_t retval;
	long offset;

	retval = rtc_read_offset(to_rtc_device(dev), &offset);
	if (retval == 0)
		retval = sprintf(buf, "%ld\n", offset);

	return retval;
}


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Total59100.00%1100.00%





static ssize_t

offset_store(struct device *dev, struct device_attribute *attr,
	     const char *buf, size_t n)
{
	ssize_t retval;
	long offset;

	retval = kstrtol(buf, 10, &offset);
	if (retval == 0)
		retval = rtc_set_offset(to_rtc_device(dev), offset);

	return (retval < 0) ? retval : n;
}

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Total71100.00%1100.00%



static DEVICE_ATTR_RW(offset);


static struct attribute *rtc_attrs[] = {
	&dev_attr_name.attr,
	&dev_attr_date.attr,
	&dev_attr_time.attr,
	&dev_attr_since_epoch.attr,
	&dev_attr_max_user_freq.attr,
	&dev_attr_hctosys.attr,
	&dev_attr_wakealarm.attr,
	&dev_attr_offset.attr,
	NULL,
};

/* The reason to trigger an alarm with no process watching it (via sysfs)
 * is its side effect:  waking from a system state like suspend-to-RAM or
 * suspend-to-disk.  So: no attribute unless that side effect is possible.
 * (Userspace may disable that mechanism later.)
 */



static bool rtc_does_wakealarm(struct rtc_device *rtc)
{
	if (!device_can_wakeup(rtc->dev.parent))
		return false;

	return rtc->ops->set_alarm != NULL;
}


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dmitry torokhovdmitry torokhov25.71%125.00%


Total35100.00%4100.00%






static umode_t rtc_attr_is_visible(struct kobject *kobj,
				   struct attribute *attr, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct rtc_device *rtc = to_rtc_device(dev);
	umode_t mode = attr->mode;

	if (attr == &dev_attr_wakealarm.attr) {
		if (!rtc_does_wakealarm(rtc))
			mode = 0;
	} else if (attr == &dev_attr_offset.attr) {
		if (!rtc->ops->set_offset)
			mode = 0;
	}

	return mode;
}


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dmitry torokhovdmitry torokhov5250.98%116.67%


joshua claytonjoshua clayton2726.47%116.67%


david brownelldavid brownell1312.75%350.00%


alessandro zummoalessandro zummo109.80%116.67%


Total102100.00%6100.00%




static struct attribute_group rtc_attr_group = {
	.is_visible	= rtc_attr_is_visible,
	.attrs		= rtc_attrs,
};


static const struct attribute_group *rtc_attr_groups[] = {
	&rtc_attr_group,
	NULL
};




const struct attribute_group **rtc_get_dev_attribute_groups(void)
{
	return rtc_attr_groups;
}

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dmitry torokhovdmitry torokhov964.29%133.33%


alessandro zummoalessandro zummo321.43%133.33%


david brownelldavid brownell214.29%133.33%


Total14100.00%3100.00%




Overall Contributors
PersonTokensPropCommitsCommitProp
david brownelldavid brownell34827.97%527.78%


alessandro zummoalessandro zummo24219.45%15.56%


joshua claytonjoshua clayton16813.50%15.56%


dmitry torokhovdmitry torokhov14411.58%316.67%


bryan kadzbanbryan kadzban1018.12%15.56%


matthew garrettmatthew garrett614.90%15.56%


bernie thompsonbernie thompson584.66%15.56%


yakui zhaoyakui zhao443.54%15.56%


greg kroah-hartmangreg kroah-hartman433.46%15.56%


labbe corentinlabbe corentin302.41%15.56%


uwe kleine-koeniguwe kleine-koenig40.32%15.56%


david friesdavid fries10.08%15.56%


Total1244100.00%18100.00%

  
Directory: drivers/rtc



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