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Commit 17e296eb authored by Gary Bisson's avatar Gary Bisson Committed by Alexandre Belloni
Browse files

rtc: m41t80: remove sqw sysfs entry 



In order to use the proper clock framework to control this feature.

Signed-off-by: default avatarGary Bisson <gary.bisson@boundarydevices.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@free-electrons.com>
parent 0f546b05

drivers/rtc/rtc-m41t80.c

+0 −88
Original line number Diff line number Diff line
@@ -446,96 +446,8 @@ static ssize_t flags_show(struct device *dev, 
}

static DEVICE_ATTR_RO(flags);



static ssize_t sqwfreq_show(struct device *dev,

			    struct device_attribute *attr, char *buf)

{

	struct i2c_client *client = to_i2c_client(dev);

	struct m41t80_data *clientdata = i2c_get_clientdata(client);

	int val, reg_sqw;



	if (!(clientdata->features & M41T80_FEATURE_SQ))

		return -EINVAL;



	reg_sqw = M41T80_REG_SQW;

	if (clientdata->features & M41T80_FEATURE_SQ_ALT)

		reg_sqw = M41T80_REG_WDAY;

	val = i2c_smbus_read_byte_data(client, reg_sqw);

	if (val < 0)

		return val;

	val = (val >> 4) & 0xf;

	switch (val) {

	case 0:

		break;

	case 1:

		val = 32768;

		break;

	default:

		val = 32768 >> val;

	}

	return sprintf(buf, "%d\n", val);

}



static ssize_t sqwfreq_store(struct device *dev,

			     struct device_attribute *attr,

			     const char *buf, size_t count)

{

	struct i2c_client *client = to_i2c_client(dev);

	struct m41t80_data *clientdata = i2c_get_clientdata(client);

	int almon, sqw, reg_sqw, rc;

	unsigned long val;



	rc = kstrtoul(buf, 0, &val);

	if (rc < 0)

		return rc;



	if (!(clientdata->features & M41T80_FEATURE_SQ))

		return -EINVAL;



	if (val) {

		if (!is_power_of_2(val))

			return -EINVAL;

		val = ilog2(val);

		if (val == 15)

			val = 1;

		else if (val < 14)

			val = 15 - val;

		else

			return -EINVAL;

	}

	/* disable SQW, set SQW frequency & re-enable */

	almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);

	if (almon < 0)

		return almon;

	reg_sqw = M41T80_REG_SQW;

	if (clientdata->features & M41T80_FEATURE_SQ_ALT)

		reg_sqw = M41T80_REG_WDAY;

	sqw = i2c_smbus_read_byte_data(client, reg_sqw);

	if (sqw < 0)

		return sqw;

	sqw = (sqw & 0x0f) | (val << 4);



	rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,

				       almon & ~M41T80_ALMON_SQWE);

	if (rc < 0)

		return rc;



	if (val) {

		rc = i2c_smbus_write_byte_data(client, reg_sqw, sqw);

		if (rc < 0)

			return rc;



		rc = i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,

					       almon | M41T80_ALMON_SQWE);

		if (rc < 0)

			return rc;

	}

	return count;

}

static DEVICE_ATTR_RW(sqwfreq);



static struct attribute *attrs[] = {

	&dev_attr_flags.attr,

	&dev_attr_sqwfreq.attr,

	NULL,

};