Commit 542dd33a authored by Michael Langer's avatar Michael Langer Committed by Linus Torvalds
Browse files

drivers/rtc/rtc-s35390a.c: add wakealarm support for rtc-s35390A rtc chip 



Add basic get/set alarm support for the Seiko Instruments S-35390A.  The
chip is used on the QNAP TS-219P+ NAS device.

Signed-off-by: default avatarMichael Langer <michael.brainbug.langer@googlemail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 48e97667

drivers/rtc/rtc-s35390a.c

+116 −0
Original line number Diff line number Diff line
@@ -19,6 +19,8 @@ 
#define S35390A_CMD_STATUS1	0

#define S35390A_CMD_STATUS2	1

#define S35390A_CMD_TIME1	2

#define S35390A_CMD_TIME2	3

#define S35390A_CMD_INT2_REG1	5



#define S35390A_BYTE_YEAR	0

#define S35390A_BYTE_MONTH	1
@@ -28,12 +30,23 @@ 
#define S35390A_BYTE_MINS	5

#define S35390A_BYTE_SECS	6



#define S35390A_ALRM_BYTE_WDAY	0

#define S35390A_ALRM_BYTE_HOURS	1

#define S35390A_ALRM_BYTE_MINS	2



#define S35390A_FLAG_POC	0x01

#define S35390A_FLAG_BLD	0x02

#define S35390A_FLAG_24H	0x40

#define S35390A_FLAG_RESET	0x80

#define S35390A_FLAG_TEST	0x01



#define S35390A_INT2_MODE_MASK		0xF0



#define S35390A_INT2_MODE_NOINTR	0x00

#define S35390A_INT2_MODE_FREQ		0x10

#define S35390A_INT2_MODE_ALARM		0x40

#define S35390A_INT2_MODE_PMIN_EDG	0x20



static const struct i2c_device_id s35390a_id[] = {

	{ "s35390a", 0 },

	{ }
@@ -193,6 +206,104 @@ static int s35390a_get_datetime(struct i2c_client *client, struct rtc_time *tm) 
	return rtc_valid_tm(tm);

}



static int s35390a_set_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)

{

	struct s35390a *s35390a = i2c_get_clientdata(client);

	char buf[3], sts = 0;

	int err, i;



	dev_dbg(&client->dev, "%s: alm is secs=%d, mins=%d, hours=%d mday=%d, "\

		"mon=%d, year=%d, wday=%d\n", __func__, alm->time.tm_sec,

		alm->time.tm_min, alm->time.tm_hour, alm->time.tm_mday,

		alm->time.tm_mon, alm->time.tm_year, alm->time.tm_wday);



	/* disable interrupt */

	err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));

	if (err < 0)

		return err;



	/* clear pending interrupt, if any */

	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS1, &sts, sizeof(sts));

	if (err < 0)

		return err;



	if (alm->enabled)

		sts = S35390A_INT2_MODE_ALARM;

	else

		sts = S35390A_INT2_MODE_NOINTR;



	/* This chip expects the bits of each byte to be in reverse order */

	sts = bitrev8(sts);



	/* set interupt mode*/

	err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));

	if (err < 0)

		return err;



	if (alm->time.tm_wday != -1)

		buf[S35390A_ALRM_BYTE_WDAY] = bin2bcd(alm->time.tm_wday) | 0x80;



	buf[S35390A_ALRM_BYTE_HOURS] = s35390a_hr2reg(s35390a,

			alm->time.tm_hour) | 0x80;

	buf[S35390A_ALRM_BYTE_MINS] = bin2bcd(alm->time.tm_min) | 0x80;



	if (alm->time.tm_hour >= 12)

		buf[S35390A_ALRM_BYTE_HOURS] |= 0x40;



	for (i = 0; i < 3; ++i)

		buf[i] = bitrev8(buf[i]);



	err = s35390a_set_reg(s35390a, S35390A_CMD_INT2_REG1, buf,

								sizeof(buf));



	return err;

}



static int s35390a_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alm)

{

	struct s35390a *s35390a = i2c_get_clientdata(client);

	char buf[3], sts;

	int i, err;



	err = s35390a_get_reg(s35390a, S35390A_CMD_STATUS2, &sts, sizeof(sts));

	if (err < 0)

		return err;



	if (bitrev8(sts) != S35390A_INT2_MODE_ALARM)

		return -EINVAL;



	err = s35390a_get_reg(s35390a, S35390A_CMD_INT2_REG1, buf, sizeof(buf));

	if (err < 0)

		return err;



	/* This chip returns the bits of each byte in reverse order */

	for (i = 0; i < 3; ++i) {

		buf[i] = bitrev8(buf[i]);

		buf[i] &= ~0x80;

	}



	alm->time.tm_wday = bcd2bin(buf[S35390A_ALRM_BYTE_WDAY]);

	alm->time.tm_hour = s35390a_reg2hr(s35390a,

						buf[S35390A_ALRM_BYTE_HOURS]);

	alm->time.tm_min = bcd2bin(buf[S35390A_ALRM_BYTE_MINS]);



	dev_dbg(&client->dev, "%s: alm is mins=%d, hours=%d, wday=%d\n",

			__func__, alm->time.tm_min, alm->time.tm_hour,

			alm->time.tm_wday);



	return 0;

}



static int s35390a_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)

{

	return s35390a_read_alarm(to_i2c_client(dev), alm);

}



static int s35390a_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)

{

	return s35390a_set_alarm(to_i2c_client(dev), alm);

}



static int s35390a_rtc_read_time(struct device *dev, struct rtc_time *tm)

{

	return s35390a_get_datetime(to_i2c_client(dev), tm);
@@ -206,6 +317,9 @@ static int s35390a_rtc_set_time(struct device *dev, struct rtc_time *tm) 
static const struct rtc_class_ops s35390a_rtc_ops = {

	.read_time	= s35390a_rtc_read_time,

	.set_time	= s35390a_rtc_set_time,

	.set_alarm	= s35390a_rtc_set_alarm,

	.read_alarm	= s35390a_rtc_read_alarm,



};



static struct i2c_driver s35390a_driver;
@@ -270,6 +384,8 @@ static int s35390a_probe(struct i2c_client *client, 
	if (s35390a_get_datetime(client, &tm) < 0)

		dev_warn(&client->dev, "clock needs to be set\n");



	device_set_wakeup_capable(&client->dev, 1);



	s35390a->rtc = rtc_device_register(s35390a_driver.driver.name,

				&client->dev, &s35390a_rtc_ops, THIS_MODULE);

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