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rtc: isl12022: implement RTC_VL_READ ioctl

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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: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20230615105826.411953-6-linux@rasmusvillemoes.dk
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Rasmus Villemoes 2023-06-15 12:58:23 +02:00 committed by Alexandre Belloni
parent 2caeb566ba
commit eccebd8138
1 changed files with 27 additions and 0 deletions
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27
drivers/rtc/rtc-isl12022.c
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@ -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,
};