diff options
Diffstat (limited to 'drivers/rtc/rtc-pcf85063.c')
| -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, |