From 322539a014bcd24cbb9281832c09b24e07912237 Mon Sep 17 00:00:00 2001 From: Emmanuel Gil Peyrot Date: Wed, 15 Dec 2021 18:54:58 +0100 Subject: rtc: gamecube: Report low battery as invalid data MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit I haven’t been able to test this patch as all of my consoles have a working RTC battery, but according to the documentation it should work like that. Signed-off-by: Emmanuel Gil Peyrot Acked-by: Michael Ellerman (powerpc) Signed-off-by: Alexandre Belloni Link: https://lore.kernel.org/r/20211215175501.6761-3-linkmauve@linkmauve.fr --- drivers/rtc/rtc-gamecube.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'drivers/rtc/rtc-gamecube.c') diff --git a/drivers/rtc/rtc-gamecube.c b/drivers/rtc/rtc-gamecube.c index e8260c82c07d..98128746171e 100644 --- a/drivers/rtc/rtc-gamecube.c +++ b/drivers/rtc/rtc-gamecube.c @@ -83,6 +83,10 @@ #define RTC_CONTROL0 0x21000c #define RTC_CONTROL1 0x21000d +/* RTC flags */ +#define RTC_CONTROL0_UNSTABLE_POWER 0x00000800 +#define RTC_CONTROL0_LOW_BATTERY 0x00000200 + struct priv { struct regmap *regmap; void __iomem *iob; @@ -182,9 +186,35 @@ static int gamecube_rtc_set_time(struct device *dev, struct rtc_time *t) return regmap_write(d->regmap, RTC_COUNTER, timestamp - d->rtc_bias); } +static int gamecube_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) +{ + struct priv *d = dev_get_drvdata(dev); + int value; + int control0; + int ret; + + switch (cmd) { + case RTC_VL_READ: + ret = regmap_read(d->regmap, RTC_CONTROL0, &control0); + if (ret) + return ret; + + value = 0; + if (control0 & RTC_CONTROL0_UNSTABLE_POWER) + value |= RTC_VL_DATA_INVALID; + if (control0 & RTC_CONTROL0_LOW_BATTERY) + value |= RTC_VL_BACKUP_LOW; + return put_user(value, (unsigned int __user *)arg); + + default: + return -ENOIOCTLCMD; + } +} + static const struct rtc_class_ops gamecube_rtc_ops = { .read_time = gamecube_rtc_read_time, .set_time = gamecube_rtc_set_time, + .ioctl = gamecube_rtc_ioctl, }; static int gamecube_rtc_read_offset_from_sram(struct priv *d) -- cgit v1.2.3