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rtc: pcf85063: add RTC_VL_READ/RTC_VL_CLR support 

Allow reading the oscillator status bit. Also allow clearing it even if
that makes little sense and can't be done in a race free way.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
hifive-unleashed-5.2
Alexandre Belloni 2019-04-01 18:08:16 +02:00
parent 85370d3dd0
commit 27ff836d2f
1 changed files with 35 additions and 0 deletions
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35
drivers/rtc/rtc-pcf85063.c
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@ -277,11 +277,45 @@ static int pcf85063_set_offset(struct device *dev, long offset)
return regmap_write(pcf85063->regmap, PCF85063_REG_OFFSET, reg);
}
static int pcf85063_ioctl(struct device *dev, unsigned int cmd,
unsigned long arg)
{
struct pcf85063 *pcf85063 = dev_get_drvdata(dev);
int status, ret = 0;
switch (cmd) {
case RTC_VL_READ:
ret = regmap_read(pcf85063->regmap, PCF85063_REG_SC, &status);
if (ret < 0)
return ret;
if (status & PCF85063_REG_SC_OS)
dev_warn(&pcf85063->rtc->dev, "Voltage low, data loss detected.\n");
status &= PCF85063_REG_SC_OS;
if (copy_to_user((void __user *)arg, &status, sizeof(int)))
return -EFAULT;
return 0;
case RTC_VL_CLR:
ret = regmap_update_bits(pcf85063->regmap, PCF85063_REG_SC,
PCF85063_REG_SC_OS, 0);
return ret;
default:
return -ENOIOCTLCMD;
}
}
static const struct rtc_class_ops pcf85063_rtc_ops = {
.read_time = pcf85063_rtc_read_time,
.set_time = pcf85063_rtc_set_time,
.read_offset = pcf85063_read_offset,
.set_offset = pcf85063_set_offset,
.ioctl = pcf85063_ioctl,
};
static const struct rtc_class_ops pcf85063_rtc_ops_alarm = {
@ -292,6 +326,7 @@ static const struct rtc_class_ops pcf85063_rtc_ops_alarm = {
.read_alarm = pcf85063_rtc_read_alarm,
.set_alarm = pcf85063_rtc_set_alarm,
.alarm_irq_enable = pcf85063_rtc_alarm_irq_enable,
.ioctl = pcf85063_ioctl,
};
static int pcf85063_nvmem_read(void *priv, unsigned int offset,