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rtc: add correction parameter

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Add a new parameter allowing the get and set the correction using ioctls
instead of just sysfs.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211018151933.76865-5-alexandre.belloni@bootlin.com
This commit is contained in:
Alexandre Belloni 2021-10-18 17:19:30 +02:00
parent 2268551935
commit a6d8c6e1a5
2 changed files with 20 additions and 0 deletions
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19
drivers/rtc/dev.c
View File

@ -398,6 +398,16 @@ static long rtc_dev_ioctl(struct file *file,
param.uvalue = rtc->features[0];
break;
case RTC_PARAM_CORRECTION:
mutex_unlock(&rtc->ops_lock);
if (param.index != 0)
return -EINVAL;
err = rtc_read_offset(rtc, &offset);
mutex_lock(&rtc->ops_lock);
if (err == 0)
param.svalue = offset;
break;
default:
err = -EINVAL;
}
@ -416,6 +426,15 @@ static long rtc_dev_ioctl(struct file *file,
switch(param.param) {
case RTC_PARAM_FEATURES:
err = -EINVAL;
break;
case RTC_PARAM_CORRECTION:
mutex_unlock(&rtc->ops_lock);
if (param.index != 0)
return -EINVAL;
return rtc_set_offset(rtc, param.svalue);
default:
err = -EINVAL;
}

1
include/uapi/linux/rtc.h
View File

@ -136,6 +136,7 @@ struct rtc_param {
/* parameter list */
#define RTC_PARAM_FEATURES 0
#define RTC_PARAM_CORRECTION 1
#define RTC_MAX_FREQ 8192