Commit 018d959b authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

rtc: rv3028: add BSM support 



Backup Switch Mode controls how the RTC decides when to switch to the
backup power supply. As it is disabled by default, provide a way to enable
and configure it.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211018151933.76865-7-alexandre.belloni@bootlin.com
parent 0d20e9fb

drivers/rtc/rtc-rv3028.c

+74 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 


#include <linux/clk-provider.h>

#include <linux/bcd.h>

#include <linux/bitfield.h>

#include <linux/bitops.h>

#include <linux/i2c.h>

#include <linux/interrupt.h>
@@ -80,6 +81,10 @@ 


#define RV3028_BACKUP_TCE		BIT(5)

#define RV3028_BACKUP_TCR_MASK		GENMASK(1,0)

#define RV3028_BACKUP_BSM		GENMASK(3,2)



#define RV3028_BACKUP_BSM_DSM		0x1

#define RV3028_BACKUP_BSM_LSM		0x3



#define OFFSET_STEP_PPT			953674
@@ -512,6 +517,71 @@ static int rv3028_set_offset(struct device *dev, long offset) 


}



static int rv3028_param_get(struct device *dev, struct rtc_param *param)

{

	struct rv3028_data *rv3028 = dev_get_drvdata(dev);

	int ret;



	switch(param->param) {

		u32 value;



	case RTC_PARAM_BACKUP_SWITCH_MODE:

		ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &value);

		if (ret < 0)

			return ret;



		value = FIELD_GET(RV3028_BACKUP_BSM, value);



		switch(value) {

		case RV3028_BACKUP_BSM_DSM:

			param->uvalue = RTC_BSM_DIRECT;

			break;

		case RV3028_BACKUP_BSM_LSM:

			param->uvalue = RTC_BSM_LEVEL;

			break;

		default:

			param->uvalue = RTC_BSM_DISABLED;

		}

		break;



	default:

		return -EINVAL;

	}



	return 0;

}



static int rv3028_param_set(struct device *dev, struct rtc_param *param)

{

	struct rv3028_data *rv3028 = dev_get_drvdata(dev);



	switch(param->param) {

		u8 mode;

	case RTC_PARAM_BACKUP_SWITCH_MODE:

		switch (param->uvalue) {

		case RTC_BSM_DISABLED:

			mode = 0;

			break;

		case RTC_BSM_DIRECT:

			mode = RV3028_BACKUP_BSM_DSM;

			break;

		case RTC_BSM_LEVEL:

			mode = RV3028_BACKUP_BSM_LSM;

			break;

		default:

			return -EINVAL;

		}



		return rv3028_update_cfg(rv3028, RV3028_BACKUP, RV3028_BACKUP_BSM,

					 FIELD_PREP(RV3028_BACKUP_BSM, mode));



	default:

		return -EINVAL;

	}



	return 0;

}



static int rv3028_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)

{

	struct rv3028_data *rv3028 = dev_get_drvdata(dev);
@@ -776,6 +846,8 @@ static const struct rtc_class_ops rv3028_rtc_ops = { 
	.read_offset = rv3028_read_offset,

	.set_offset = rv3028_set_offset,

	.ioctl = rv3028_ioctl,

	.param_get = rv3028_param_get,

	.param_set = rv3028_param_set,

};



static const struct regmap_config regmap_config = {
@@ -878,6 +950,8 @@ static int rv3028_probe(struct i2c_client *client) 
	if (ret)

		return ret;



	set_bit(RTC_FEATURE_BACKUP_SWITCH_MODE, rv3028->rtc->features);



	rv3028->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;

	rv3028->rtc->range_max = RTC_TIMESTAMP_END_2099;

	rv3028->rtc->ops = &rv3028_rtc_ops;