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@xxxxxxxxxxxxxxxxxx>
---
drivers/rtc/rtc-isl12022.c | 41 ++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/drivers/rtc/rtc-isl12022.c b/drivers/rtc/rtc-isl12022.c
index cb8f1d92e116..1b6659a9b33a 100644
--- a/drivers/rtc/rtc-isl12022.c
+++ b/drivers/rtc/rtc-isl12022.c
@@ -203,7 +203,48 @@ 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_read_sr(struct regmap *regmap)
+{
+ int ret;
+ u32 val;
+
+ ret = regmap_read(regmap, ISL12022_REG_SR, &val);
+ if (ret < 0)
+ return ret;
+ return val;
+}
+
+static int isl12022_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+ struct regmap *regmap = dev_get_drvdata(dev);
+ u32 user = 0;
+ int ret;
+
+ switch (cmd) {
+ case RTC_VL_READ:
+ ret = isl12022_read_sr(regmap);
+ if (ret < 0)
+ return ret;
+
+ if (ret & ISL12022_SR_LBAT85)
+ user |= RTC_VL_BACKUP_LOW;
+
+ if (ret & ISL12022_SR_LBAT75)
+ user |= RTC_VL_BACKUP_EMPTY;
+
+ return put_user(user, (u32 __user *)arg);
+
+ case RTC_VL_CLR:
+ return regmap_clear_bits(regmap, ISL12022_REG_SR,
+ ISL12022_SR_LBAT85 | ISL12022_SR_LBAT75);
+
+ 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,
};
--
2.37.2
