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Commit f32bc70d authored by Jesper Nilsson's avatar Jesper Nilsson Committed by Linus Torvalds
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rtc-pcf8523: add low battery voltage support 



Implement reading of the battery voltage low signal for rtc-pcf8523.

The bit is read-only and cannot be cleared by software, so no
clear function is implemented.

[akpm@linux-foundation.org: omit pcf8563_rtc_ioctl() if CONFIG_RTC_INTF_DEV=n]
Signed-off-by: default avatarJesper Nilsson <jesper.nilsson@axis.com>
Reviewed-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fca1dd03

drivers/rtc/rtc-pcf8523.c

+31 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#define REG_CONTROL3_PM_VDD (1 << 6) /* switch-over disabled */

#define REG_CONTROL3_PM_DSM (1 << 5) /* direct switching mode */

#define REG_CONTROL3_PM_MASK 0xe0

#define REG_CONTROL3_BLF (1 << 2) /* battery low bit, read-only */



#define REG_SECONDS  0x03

#define REG_SECONDS_OS (1 << 7)
@@ -250,9 +251,39 @@ static int pcf8523_rtc_set_time(struct device *dev, struct rtc_time *tm) 
	return pcf8523_start_rtc(client);

}



#ifdef CONFIG_RTC_INTF_DEV

static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd,

			     unsigned long arg)

{

	struct i2c_client *client = to_i2c_client(dev);

	u8 value;

	int ret = 0, err;



	switch (cmd) {

	case RTC_VL_READ:

		err = pcf8523_read(client, REG_CONTROL3, &value);

		if (err < 0)

			return err;



		if (value & REG_CONTROL3_BLF)

			ret = 1;



		if (copy_to_user((void __user *)arg, &ret, sizeof(int)))

			return -EFAULT;



		return 0;

	default:

		return -ENOIOCTLCMD;

	}

}

#else

#define pcf8523_rtc_ioctl NULL

#endif



static const struct rtc_class_ops pcf8523_rtc_ops = {

	.read_time = pcf8523_rtc_read_time,

	.set_time = pcf8523_rtc_set_time,

	.ioctl = pcf8523_rtc_ioctl,

};



static int pcf8523_probe(struct i2c_client *client,