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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-04-01 19:08:16 +0300 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-04-04 11:07:11 +0300 |
| commit | 27ff836d2f44e73370e247b2fa535166a7dcfbb9 (patch) | |
| tree | e2bbf5e00523eae5f3af14ecfa47ca5cfae8ce02 | |
| parent | 85370d3dd0d10a1ae5731c76409d7196ad9f5786 (diff) | |
| download | linux-27ff836d2f44e73370e247b2fa535166a7dcfbb9.tar.xz | |
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>
| -rw-r--r-- | drivers/rtc/rtc-pcf85063.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c index ed7f17125365..1afa6d9fa9fb 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, |