Commit a6d8c6e1 authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

rtc: add correction parameter 



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

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211018151933.76865-5-alexandre.belloni@bootlin.com
parent 22685519

drivers/rtc/dev.c

+19 −0
Original line number Diff line number Diff line
@@ -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;

		}

include/uapi/linux/rtc.h

+1 −0
Original line number Diff line number Diff line
@@ -136,6 +136,7 @@ struct rtc_param { 


/* parameter list */

#define RTC_PARAM_FEATURES		0

#define RTC_PARAM_CORRECTION		1



#define RTC_MAX_FREQ	8192