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rtc: gamecube: Report low battery as invalid data

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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
This commit is contained in:
Emmanuel Gil Peyrot 2021-12-15 18:54:58 +01:00 committed by Alexandre Belloni
parent 86559400b3
commit 322539a014
1 changed files with 30 additions and 0 deletions
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30
drivers/rtc/rtc-gamecube.c
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@ -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)