[PATCH v3 2/5] rtc: gamecube: Report low battery as invalid data
From: Emmanuel Gil Peyrot <hidden>
Date: 2021-12-15 18:02:41
Also in:
linux-rtc, linuxppc-dev, lkml
Subsystem:
real time clock (rtc) subsystem, the rest · Maintainers:
Alexandre Belloni, Linus Torvalds
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 <redacted> --- drivers/rtc/rtc-gamecube.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)
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)
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2.34.1