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Subject[PATCH 12/12] rtc: pcf85063: add RTC_VL_READ/RTC_VL_CLR support
Date
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>
---
drivers/rtc/rtc-pcf85063.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c
index 1bce53f8a7da..e550db5c2bc2 100644
--- a/drivers/rtc/rtc-pcf85063.c
+++ b/drivers/rtc/rtc-pcf85063.c
@@ -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,
--
2.20.1
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