static ssize_t test_irq_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int retval;
struct platform_device *plat_dev = to_platform_device(dev);
struct rtc_device *rtc = platform_get_drvdata(plat_dev);
retval = count;
if (strncmp(buf, "tick", 4) == 0 && rtc->pie_enabled)
rtc_update_irq(rtc, 1, RTC_PF | RTC_IRQF);
else if (strncmp(buf, "alarm", 5) == 0) {
struct rtc_wkalrm alrm;
int err = rtc_read_alarm(rtc, &alrm);
if (!err && alrm.enabled)
rtc_update_irq(rtc, 1, RTC_AF | RTC_IRQF);
} else if (strncmp(buf, "update", 6) == 0 && rtc->uie_rtctimer.enabled)
rtc_update_irq(rtc, 1, RTC_UF | RTC_IRQF);
else
retval = -EINVAL;
return retval;
}
static ssize_t
rtc_sysfs_show_wakealarm(struct device *dev, struct device_attribute *attr,
char *buf)
{
ssize_t retval;
unsigned long alarm;
struct rtc_wkalrm alm;
printk("%s \n", __func__);
/* 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.
*/
alm.enabled=1;
retval = rtc_read_alarm(to_rtc_device(dev), &alm);
printk("show_alarm retval: %d\n",retval);
if (retval == 0 && alm.enabled) {
rtc_tm_to_time(&alm.time, &alarm);
retval = sprintf(buf, "%lu \n", alarm);
printk("alarm buf: %s \n",buf);
}
return retval;
}
static int suspend_autotest_suspend(struct device *dev)
{
unsigned long now;
struct rtc_wkalrm alm;
int status;
int need_test = 0;
unsigned long alarm_time;
/* if test isn't enabled, no need to proceed below code */
if ((!test_enable) || (test_mode != SUSPEND))
return 0;
/* read alarm time */
status = rtc_read_alarm(rtc, &alm);
if (status) {
pr_info("%s: rtc_read_alarm fail\n", __func__);
return status;
}
rtc_tm_to_time(&alm.time, &alarm_time);
/* if alarm is set already, alarm time should be compared.
* if no alarm is set, test alarm can be done.
*/
if (alm.enabled)
need_test = 0;
else
need_test = 1;
status = rtc_read_time(rtc, &alm.time);
if (status < 0) {
pr_info("%s: rtc_read_time fail\n", __func__);
return status;
}
rtc_tm_to_time(&alm.time, &now);
/* if alarm will be expired in TEST_SUSPEND_SECONDS,
* don't set test alarm time
*/
if (!need_test && alarm_time < (now + TEST_SUSPEND_SECONDS)) {
pr_info("%s: no setting of test alarm\n", __func__);
return 0;
}
memset(&alm, 0, sizeof alm);
rtc_time_to_tm(now + TEST_SUSPEND_SECONDS, &alm.time);
alm.enabled = true;
status = rtc_set_alarm(rtc, &alm);
if (status < 0) {
pr_info("%s: rtc_set_alarm fail\n",__func__);
return status;
}
test_alarm_set = 1;
pr_info("%s: test alarm will be envoked after about %d sec.\n",
__func__, TEST_SUSPEND_SECONDS);
return 0;
}
static int rtc_proc_show(struct seq_file *seq, void *offset)
{
int err;
struct class_device *class_dev = seq->private;
const struct rtc_class_ops *ops = to_rtc_device(class_dev)->ops;
struct rtc_wkalrm alrm;
struct rtc_time tm;
err = rtc_read_time(class_dev, &tm);
if (err == 0) {
seq_printf(seq,
"rtc_time\t: %02d:%02d:%02d\n"
"rtc_date\t: %04d-%02d-%02d\n",
tm.tm_hour, tm.tm_min, tm.tm_sec,
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
}
err = rtc_read_alarm(class_dev, &alrm);
if (err == 0) {
seq_printf(seq, "alrm_time\t: ");
if ((unsigned int)alrm.time.tm_hour <= 24)
seq_printf(seq, "%02d:", alrm.time.tm_hour);
else
seq_printf(seq, "**:");
if ((unsigned int)alrm.time.tm_min <= 59)
seq_printf(seq, "%02d:", alrm.time.tm_min);
else
seq_printf(seq, "**:");
if ((unsigned int)alrm.time.tm_sec <= 59)
seq_printf(seq, "%02d\n", alrm.time.tm_sec);
else
seq_printf(seq, "**\n");
seq_printf(seq, "alrm_date\t: ");
if ((unsigned int)alrm.time.tm_year <= 200)
seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
else
seq_printf(seq, "****-");
if ((unsigned int)alrm.time.tm_mon <= 11)
seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
else
seq_printf(seq, "**-");
if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
seq_printf(seq, "%02d\n", alrm.time.tm_mday);
else
seq_printf(seq, "**\n");
seq_printf(seq, "alarm_IRQ\t: %s\n",
alrm.enabled ? "yes" : "no");
seq_printf(seq, "alrm_pending\t: %s\n",
alrm.pending ? "yes" : "no");
}
seq_printf(seq, "24hr\t\t: yes\n");
if (ops->proc)
ops->proc(class_dev->dev, seq);
return 0;
}
static int rtc_read_proc(char *page, char **start, off_t off, int count, int *eof, void *data)
{
struct rtc_ops *ops = data;
struct rtc_wkalrm alrm;
struct rtc_time tm;
char *p = page;
if (rtc_read_time(ops, &tm) == 0) {
p += sprintf(p,
"rtc_time\t: %02d:%02d:%02d\n"
"rtc_date\t: %04d-%02d-%02d\n"
"rtc_epoch\t: %04lu\n",
tm.tm_hour, tm.tm_min, tm.tm_sec,
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
rtc_epoch);
}
if (rtc_read_alarm(ops, &alrm) == 0) {
p += sprintf(p, "alrm_time\t: ");
if ((unsigned int)alrm.time.tm_hour <= 24)
p += sprintf(p, "%02d:", alrm.time.tm_hour);
else
p += sprintf(p, "**:");
if ((unsigned int)alrm.time.tm_min <= 59)
p += sprintf(p, "%02d:", alrm.time.tm_min);
else
p += sprintf(p, "**:");
if ((unsigned int)alrm.time.tm_sec <= 59)
p += sprintf(p, "%02d\n", alrm.time.tm_sec);
else
p += sprintf(p, "**\n");
p += sprintf(p, "alrm_date\t: ");
if ((unsigned int)alrm.time.tm_year <= 200)
p += sprintf(p, "%04d-", alrm.time.tm_year + 1900);
else
p += sprintf(p, "****-");
if ((unsigned int)alrm.time.tm_mon <= 11)
p += sprintf(p, "%02d-", alrm.time.tm_mon + 1);
else
p += sprintf(p, "**-");
if ((unsigned int)alrm.time.tm_mday <= 31)
p += sprintf(p, "%02d\n", alrm.time.tm_mday);
else
p += sprintf(p, "**\n");
p += sprintf(p, "alrm_wakeup\t: %s\n",
alrm.enabled ? "yes" : "no");
p += sprintf(p, "alrm_pending\t: %s\n",
alrm.pending ? "yes" : "no");
}
if (ops->proc)
p += ops->proc(p);
return p - page;
}
static ssize_t
rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
ssize_t retval;
unsigned long now, alarm;
struct rtc_wkalrm alm;
struct rtc_device *rtc = to_rtc_device(dev);
char *buf_ptr;
int adjust = 0;
printk("%s \n", __func__);
/* 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);
sys_out("retval is %d \n", retval);
if (retval < 0)
return retval;
rtc_tm_to_time(&alm.time, &now);
buf_ptr = (char *)buf;
if (*buf_ptr == '+') {
buf_ptr++;
adjust = 1;
}
alarm = simple_strtoul(buf_ptr, NULL, 0);
if (adjust) {
alarm += now;
}
if (alarm > now) {
/* 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)
return -EBUSY;
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);
printk("set_alarm retval: %d\n",retval);
return (retval < 0) ? retval : n;
}
static int set_wakealarm(void)
{
int retval = 0;
unsigned long now, alarm;
struct rtc_wkalrm alm;
struct rtc_device *rtc;
rtc = rtc_class_open(CONFIG_WAKEALARM_RTC);
if (!rtc) {
return -1;
}
/* 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)
goto close_rtc;
rtc_tm_to_time(&alm.time, &now);
alarm = now + sleep_time;
if (alarm > now) {
/* 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)
goto close_rtc;
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);
close_rtc:
rtc_class_close(rtc);
return retval;
}
static ssize_t
rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
ssize_t retval;
unsigned long now, alarm;
struct rtc_wkalrm alm;
struct rtc_device *rtc = to_rtc_device(dev);
char *buf_ptr;
int adjust = 0;
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++;
adjust = 1;
}
alarm = simple_strtoul(buf_ptr, NULL, 0);
if (adjust) {
alarm += now;
}
if (alarm > now) {
retval = rtc_read_alarm(rtc, &alm);
if (retval < 0)
return retval;
if (alm.enabled)
return -EBUSY;
alm.enabled = 1;
} else {
alm.enabled = 0;
alarm = now + 300;
}
rtc_time_to_tm(alarm, &alm.time);
retval = rtc_set_alarm(rtc, &alm);
return (retval < 0) ? retval : n;
}
static ssize_t
rtc_sysfs_show_wakealarm(struct device *dev, struct device_attribute *attr,
char *buf)
{
ssize_t retval;
unsigned long alarm;
struct rtc_wkalrm alm;
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;
}
int alarm_read_rtc_ring(int *flag, unsigned long *alarm_time)
{
struct rtc_wkalrm rtc_alarm;
int ret = 0;
if (pwr_rtc_dev != NULL) {
if (pwr_rtc_dev->dev.platform_data)
*flag = *(int *)(pwr_rtc_dev->dev.platform_data);
ret = rtc_read_alarm(pwr_rtc_dev, &rtc_alarm);
if (ret < 0)
goto out;
rtc_tm_to_time(&rtc_alarm.time, alarm_time);
pr_alarm(INT, "%s, flag: %d, alarm time: %lu\n",
__func__, *flag, *alarm_time);
}
out:
return ret;
}
static ssize_t
rtc_sysfs_set_wakealarm(struct class_device *dev, const char *buf, size_t n)
{
ssize_t retval;
unsigned long now, alarm;
struct rtc_wkalrm alm;
/* 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(dev, &alm.time);
if (retval < 0)
return retval;
rtc_tm_to_time(&alm.time, &now);
alarm = simple_strtoul(buf, NULL, 0);
if (alarm > now) {
/* 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(dev, &alm);
if (retval < 0)
return retval;
if (alm.enabled)
return -EBUSY;
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(dev, &alm);
return (retval < 0) ? retval : n;
}
void power_on_alarm_init(void)
{
struct rtc_wkalrm rtc_alarm;
struct rtc_time rt;
unsigned long alarm_time;
struct rtc_device *rtc;
rtc = alarmtimer_get_rtcdev();
/* If we have no rtcdev, just return */
if (!rtc)
return;
rtc_read_alarm(rtc, &rtc_alarm);
rt = rtc_alarm.time;
rtc_tm_to_time(&rt, &alarm_time);
if (alarm_time)
power_on_alarm = alarm_time;
else
power_on_alarm = 0;
}
static ssize_t
rtc_sysfs_show_wakealarm(struct class_device *dev, char *buf)
{
ssize_t retval;
unsigned long alarm;
struct rtc_wkalrm alm;
/* Don't show disabled alarms; but the RTC could leave the
* alarm enabled after it's already triggered. Alarms are
* conceptually one-shot, even though some common hardware
* (PCs) doesn't actually work that way.
*
* REVISIT maybe we should require RTC implementations to
* disable the RTC alarm after it triggers, for uniformity.
*/
retval = rtc_read_alarm(dev, &alm);
if (retval == 0 && alm.enabled) {
rtc_tm_to_time(&alm.time, &alarm);
retval = sprintf(buf, "%lu\n", alarm);
}
return retval;
}
static ssize_t
wakealarm_show(struct device *dev, struct device_attribute *attr, char *buf)
{
ssize_t retval;
time64_t 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) {
alarm = rtc_tm_to_time64(&alm.time);
retval = sprintf(buf, "%lld\n", alarm);
}
return retval;
}
static ssize_t
rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
ssize_t retval;
unsigned long now, alarm;
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.
*/
printk("rtc_sysfs_set_wakealarm is enter,buf=%s,n=%d,zte_rtc_alarm_en=%d\n",buf,n,zte_rtc_alarm_en);
zte_rtc_alarm_en=0;
retval = rtc_read_time(rtc, &alm.time);
if (retval < 0)
{
printk("rtc_sysfs_set_wakealarm is error1 return=%d\n",retval);
return retval;
}
rtc_tm_to_time(&alm.time, &now);
buf_ptr = (char *)buf;
if (*buf_ptr == '+') {
buf_ptr++;
adjust = 1;
}
alarm = simple_strtoul(buf_ptr, NULL, 0);
if (adjust) {
alarm /= MSEC_PER_SEC;
alarm += now;
}
printk("rtc_sysfs_set_wakealarm:alarm=%ld,now=%ld\n",alarm,now);
if (alarm > now) {
/* 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)
{
printk("rtc_sysfs_set_wakealarm is error2 return=%d\n",retval);
return retval;
}
#if 0
if (alm.enabled)
{
printk("rtc_sysfs_set_wakealarm is error3 return=-EBUSY\n");
return -EBUSY;
}
#endif
zte_rtc_alarm_en=1;
alm.enabled = 1;
setup_hibernate_alarm(rtc, (alarm - now));
}
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;
setup_hibernate_alarm(rtc, 0);
}
rtc_time_to_tm(alarm, &alm.time);
retval = rtc_set_alarm(rtc, &alm);
printk("rtc_sysfs_set_wakealarm is ok return=%d,zte_rtc_alarm_en=%d\n",retval,zte_rtc_alarm_en);
return (retval < 0) ? retval : n;
}
static int rtc_proc_show(struct seq_file *seq, void *offset)
{
int err;
struct rtc_device *rtc = seq->private;
const struct rtc_class_ops *ops = rtc->ops;
struct rtc_wkalrm alrm;
struct rtc_time tm;
err = rtc_read_time(rtc, &tm);
if (err == 0) {
seq_printf(seq,
"rtc_time\t: %02d:%02d:%02d\n"
"rtc_date\t: %04d-%02d-%02d\n",
tm.tm_hour, tm.tm_min, tm.tm_sec,
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
}
err = rtc_read_alarm(rtc, &alrm);
if (err == 0) {
seq_printf(seq, "alrm_time\t: ");
if ((unsigned int)alrm.time.tm_hour <= 24)
seq_printf(seq, "%02d:", alrm.time.tm_hour);
else
seq_printf(seq, "**:");
if ((unsigned int)alrm.time.tm_min <= 59)
seq_printf(seq, "%02d:", alrm.time.tm_min);
else
seq_printf(seq, "**:");
if ((unsigned int)alrm.time.tm_sec <= 59)
seq_printf(seq, "%02d\n", alrm.time.tm_sec);
else
seq_printf(seq, "**\n");
seq_printf(seq, "alrm_date\t: ");
if ((unsigned int)alrm.time.tm_year <= 200)
seq_printf(seq, "%04d-", alrm.time.tm_year + 1900);
else
seq_printf(seq, "****-");
if ((unsigned int)alrm.time.tm_mon <= 11)
seq_printf(seq, "%02d-", alrm.time.tm_mon + 1);
else
seq_printf(seq, "**-");
if (alrm.time.tm_mday && (unsigned int)alrm.time.tm_mday <= 31)
seq_printf(seq, "%02d\n", alrm.time.tm_mday);
else
seq_printf(seq, "**\n");
seq_printf(seq, "alarm_IRQ\t: %s\n",
alrm.enabled ? "yes" : "no");
seq_printf(seq, "alrm_pending\t: %s\n",
alrm.pending ? "yes" : "no");
seq_printf(seq, "update IRQ enabled\t: %s\n",
(rtc->uie_rtctimer.enabled) ? "yes" : "no");
seq_printf(seq, "periodic IRQ enabled\t: %s\n",
(rtc->pie_enabled) ? "yes" : "no");
seq_printf(seq, "periodic IRQ frequency\t: %d\n",
rtc->irq_freq);
seq_printf(seq, "max user IRQ frequency\t: %d\n",
rtc->max_user_freq);
}
seq_printf(seq, "24hr\t\t: yes\n");
if (ops->proc)
ops->proc(rtc->dev.parent, seq);
return 0;
}
static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
struct rtc_ops *ops = file->private_data;
struct rtc_time tm;
struct rtc_wkalrm alrm;
void __user *uarg = (void __user *)arg;
int ret = -EINVAL;
switch (cmd) {
case RTC_ALM_READ:
ret = rtc_read_alarm(ops, &alrm);
if (ret)
break;
ret = copy_to_user(uarg, &alrm.time, sizeof(tm));
if (ret)
ret = -EFAULT;
break;
case RTC_ALM_SET:
ret = copy_from_user(&alrm.time, uarg, sizeof(tm));
if (ret) {
ret = -EFAULT;
break;
}
alrm.enabled = 0;
alrm.pending = 0;
alrm.time.tm_mday = -1;
alrm.time.tm_mon = -1;
alrm.time.tm_year = -1;
alrm.time.tm_wday = -1;
alrm.time.tm_yday = -1;
alrm.time.tm_isdst = -1;
ret = rtc_set_alarm(ops, &alrm);
break;
case RTC_RD_TIME:
ret = rtc_read_time(ops, &tm);
if (ret)
break;
ret = copy_to_user(uarg, &tm, sizeof(tm));
if (ret)
ret = -EFAULT;
break;
case RTC_SET_TIME:
if (!capable(CAP_SYS_TIME)) {
ret = -EACCES;
break;
}
ret = copy_from_user(&tm, uarg, sizeof(tm));
if (ret) {
ret = -EFAULT;
break;
}
ret = rtc_set_time(ops, &tm);
break;
case RTC_EPOCH_SET:
#ifndef rtc_epoch
/*
* There were no RTC clocks before 1900.
*/
if (arg < 1900) {
ret = -EINVAL;
break;
}
if (!capable(CAP_SYS_TIME)) {
ret = -EACCES;
break;
}
rtc_epoch = arg;
ret = 0;
#endif
break;
case RTC_EPOCH_READ:
ret = put_user(rtc_epoch, (unsigned long __user *)uarg);
break;
case RTC_WKALM_SET:
ret = copy_from_user(&alrm, uarg, sizeof(alrm));
if (ret) {
ret = -EFAULT;
break;
}
ret = rtc_set_alarm(ops, &alrm);
break;
case RTC_WKALM_RD:
ret = rtc_read_alarm(ops, &alrm);
if (ret)
break;
ret = copy_to_user(uarg, &alrm, sizeof(alrm));
if (ret)
ret = -EFAULT;
break;
default:
if (ops->ioctl)
ret = ops->ioctl(cmd, arg);
break;
}
return ret;
}
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);
const 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 = 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;
}