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Commit 0f20b767 authored by Alexander Stein's avatar Alexander Stein Committed by Linus Torvalds
Browse files

drivers/rtc/rtc-pcf8563.c: add RTC_VL_READ/RTC_VL_CLR ioctl feature 



Changes are based on arch/cris/arch-v10/drivers/pcf8563.c

[akpm@linux-foundation.org: fix sparse warning]
Signed-off-by: default avatarAlexander Stein <alexander.stein@systec-electronic.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Mikael Starvik <starvik@axis.com>
Acked-by: default avatarJesper Nilsson <jesper.nilsson@axis.com>
Cc: Wu Fengguang <wfg@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent e311c929

drivers/rtc/rtc-pcf8563.c

+43 −1
Original line number Diff line number Diff line
@@ -64,6 +64,7 @@ struct pcf8563 { 
	 * 1970...2069.

	 */

	int c_polarity;	/* 0: MO_C=1 means 19xx, otherwise MO_C=1 means 20xx */

	int voltage_low; /* incicates if a low_voltage was detected */

};



/*
@@ -86,9 +87,11 @@ static int pcf8563_get_datetime(struct i2c_client *client, struct rtc_time *tm) 
		return -EIO;

	}



	if (buf[PCF8563_REG_SC] & PCF8563_SC_LV)

	if (buf[PCF8563_REG_SC] & PCF8563_SC_LV) {

		pcf8563->voltage_low = 1;

		dev_info(&client->dev,

			"low voltage detected, date/time is not reliable.\n");

	}



	dev_dbg(&client->dev,

		"%s: raw data is st1=%02x, st2=%02x, sec=%02x, min=%02x, hr=%02x, "
@@ -173,6 +176,44 @@ static int pcf8563_set_datetime(struct i2c_client *client, struct rtc_time *tm) 
	return 0;

}



#ifdef CONFIG_RTC_INTF_DEV

static int pcf8563_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)

{

	struct pcf8563 *pcf8563 = i2c_get_clientdata(to_i2c_client(dev));

	struct rtc_time tm;



	switch (cmd) {

	case RTC_VL_READ:

		if (pcf8563->voltage_low)

			dev_info(dev, "low voltage detected, date/time is not reliable.\n");



		if (copy_to_user((void __user *)arg, &pcf8563->voltage_low,

					sizeof(int)))

			return -EFAULT;

		return 0;

	case RTC_VL_CLR:

		/*

		 * Clear the VL bit in the seconds register in case

		 * the time has not been set already (which would

		 * have cleared it). This does not really matter

		 * because of the cached voltage_low value but do it

		 * anyway for consistency.

		 */

		if (pcf8563_get_datetime(to_i2c_client(dev), &tm))

			pcf8563_set_datetime(to_i2c_client(dev), &tm);



		/* Clear the cached value. */

		pcf8563->voltage_low = 0;



		return 0;

	default:

		return -ENOIOCTLCMD;

	}

}

#else

#define pcf8563_rtc_ioctl NULL

#endif



static int pcf8563_rtc_read_time(struct device *dev, struct rtc_time *tm)

{

	return pcf8563_get_datetime(to_i2c_client(dev), tm);
@@ -184,6 +225,7 @@ static int pcf8563_rtc_set_time(struct device *dev, struct rtc_time *tm) 
}



static const struct rtc_class_ops pcf8563_rtc_ops = {

	.ioctl		= pcf8563_rtc_ioctl,

	.read_time	= pcf8563_rtc_read_time,

	.set_time	= pcf8563_rtc_set_time,

};