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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2023-06-15 12:58:23 +0200
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2023-08-16 01:27:01 +0200
commiteccebd813874b748ac4e79a9fe4c7290117ad3be (patch)
tree4681880861e2005aada4c68f7848dcac32357db4 /drivers/rtc/rtc-isl12022.c
parent2caeb566baabb65add7d99ca6d8bfd566fe91582 (diff)
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: 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>
Diffstat (limited to 'drivers/rtc/rtc-isl12022.c')
-rw-r--r--drivers/rtc/rtc-isl12022.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-isl12022.c b/drivers/rtc/rtc-isl12022.c
index a50eed4e4028..0ed28b57bcd8 100644
--- a/drivers/rtc/rtc-isl12022.c
+++ b/drivers/rtc/rtc-isl12022.c
@@ -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,
};