Commit eccebd81 authored by Rasmus Villemoes's avatar Rasmus Villemoes Committed by Alexandre Belloni
Browse files

rtc: isl12022: implement RTC_VL_READ ioctl 



Hook up support for reading the values of the SR_LBAT85 and SR_LBAT75
bits. Translate the former to "battery low", and the latter to
"battery empty or not-present".

Signed-off-by: default avatarRasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20230615105826.411953-6-linux@rasmusvillemoes.dk


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 2caeb566

drivers/rtc/rtc-isl12022.c

+27 −0
Original line number Diff line number Diff line
@@ -204,7 +204,34 @@ static int isl12022_rtc_set_time(struct device *dev, struct rtc_time *tm) 
	return regmap_bulk_write(regmap, ISL12022_REG_SC, buf, sizeof(buf));

}



static int isl12022_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)

{

	struct regmap *regmap = dev_get_drvdata(dev);

	u32 user, val;

	int ret;



	switch (cmd) {

	case RTC_VL_READ:

		ret = regmap_read(regmap, ISL12022_REG_SR, &val);

		if (ret)

			return ret;



		user = 0;

		if (val & ISL12022_SR_LBAT85)

			user |= RTC_VL_BACKUP_LOW;



		if (val & ISL12022_SR_LBAT75)

			user |= RTC_VL_BACKUP_EMPTY;



		return put_user(user, (u32 __user *)arg);



	default:

		return -ENOIOCTLCMD;

	}

}



static const struct rtc_class_ops isl12022_rtc_ops = {

	.ioctl		= isl12022_rtc_ioctl,

	.read_time	= isl12022_rtc_read_time,

	.set_time	= isl12022_rtc_set_time,

};