From eccebd813874b748ac4e79a9fe4c7290117ad3be Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Thu, 15 Jun 2023 12:58:23 +0200 Subject: [PATCH] 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 Link: https://lore.kernel.org/r/20230615105826.411953-6-linux@rasmusvillemoes.dk Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-isl12022.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) 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, };