[PATCH v2 4/7] rtc: add correction parameter
From: Alexandre Belloni <alexandre.belloni@bootlin.com>
Date: 2021-10-18 15:19:50
Also in:
lkml
Subsystem:
real time clock (rtc) subsystem, the rest · Maintainers:
Alexandre Belloni, Linus Torvalds
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> --- drivers/rtc/dev.c | 19 +++++++++++++++++++ include/uapi/linux/rtc.h | 1 + 2 files changed, 20 insertions(+)
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
--
2.31.1