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authorAlexandre Belloni <alexandre.belloni@bootlin.com>2021-10-18 18:19:30 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2021-10-18 18:20:50 +0300
commita6d8c6e1a5c6fb982964861dc84c0c7cb0151c7c (patch)
tree8d2c5f907bf0414f056a087067ebc2f9ea7a6384
parent2268551935dbf1abcbb4d4fb7b1ad74dbe0d1be0 (diff)
downloadlinux-a6d8c6e1a5c6fb982964861dc84c0c7cb0151c7c.tar.xz
rtc: add correction parameter
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
-rw-r--r--drivers/rtc/dev.c19
-rw-r--r--include/uapi/linux/rtc.h1
2 files changed, 20 insertions, 0 deletions
diff --git a/drivers/rtc/dev.c b/drivers/rtc/dev.c
index 143c097eff0f..abee1fc4705e 100644
--- a/drivers/rtc/dev.c
+++ b/drivers/rtc/dev.c
@@ -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;
}
diff --git a/include/uapi/linux/rtc.h b/include/uapi/linux/rtc.h
index c83bb9a4fa4f..5debe82439c2 100644
--- a/include/uapi/linux/rtc.h
+++ b/include/uapi/linux/rtc.h
@@ -136,6 +136,7 @@ struct rtc_param {
/* parameter list */
#define RTC_PARAM_FEATURES 0
+#define RTC_PARAM_CORRECTION 1
#define RTC_MAX_FREQ 8192