diff options
| author | Emmanuel Gil Peyrot <linkmauve@linkmauve.fr> | 2021-12-15 18:54:58 +0100 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2021-12-16 10:46:35 +0100 |
| commit | 322539a014bcd24cbb9281832c09b24e07912237 (patch) | |
| tree | 6c3c8b22747a16192c533e58e6b787f887a8951d /drivers/rtc/rtc-gamecube.c | |
| parent | 86559400b3ef9de93ba50523cffe767c35cd531a (diff) | |
| download | linux-322539a014bcd24cbb9281832c09b24e07912237.tar.gz | |
rtc: gamecube: Report low battery as invalid data
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 <linkmauve@linkmauve.fr>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211215175501.6761-3-linkmauve@linkmauve.fr
Diffstat (limited to 'drivers/rtc/rtc-gamecube.c')
| -rw-r--r-- | drivers/rtc/rtc-gamecube.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-gamecube.c b/drivers/rtc/rtc-gamecube.c index e8260c82c07db..98128746171e5 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) |