Commit 27ff836d authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

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: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 85370d3d

drivers/rtc/rtc-pcf85063.c

+35 −0
Original line number Diff line number Diff line
@@ -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,