Commit 6084eac3 authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

rtc: rv3032: allow setting BSM 



Backup Switch Mode is currently set properly when the trickle charger is
enabled. However, in the case of a non-rechargeable battery, it is
necessary to be able to enable it, only allow that when the trickle charger
is disabled.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211018151933.76865-8-alexandre.belloni@bootlin.com
parent 018d959b

drivers/rtc/rtc-rv3032.c

+76 −0
Original line number Diff line number Diff line
@@ -106,6 +106,7 @@ 
struct rv3032_data {

	struct regmap *regmap;

	struct rtc_device *rtc;

	bool trickle_charger_set;

#ifdef CONFIG_COMMON_CLK

	struct clk_hw clkout_hw;

#endif
@@ -402,6 +403,75 @@ static int rv3032_set_offset(struct device *dev, long offset) 
				 FIELD_PREP(RV3032_OFFSET_MSK, offset));

}



static int rv3032_param_get(struct device *dev, struct rtc_param *param)

{

	struct rv3032_data *rv3032 = dev_get_drvdata(dev);

	int ret;



	switch(param->param) {

		u32 value;



	case RTC_PARAM_BACKUP_SWITCH_MODE:

		ret = regmap_read(rv3032->regmap, RV3032_PMU, &value);

		if (ret < 0)

			return ret;



		value = FIELD_GET(RV3032_PMU_BSM, value);



		switch(value) {

		case RV3032_PMU_BSM_DSM:

			param->uvalue = RTC_BSM_DIRECT;

			break;

		case RV3032_PMU_BSM_LSM:

			param->uvalue = RTC_BSM_LEVEL;

			break;

		default:

			param->uvalue = RTC_BSM_DISABLED;

		}



		break;



	default:

		return -EINVAL;

	}



	return 0;

}



static int rv3032_param_set(struct device *dev, struct rtc_param *param)

{

	struct rv3032_data *rv3032 = dev_get_drvdata(dev);



	switch(param->param) {

		u8 mode;

	case RTC_PARAM_BACKUP_SWITCH_MODE:

		if (rv3032->trickle_charger_set)

			return -EINVAL;



		switch (param->uvalue) {

		case RTC_BSM_DISABLED:

			mode = 0;

			break;

		case RTC_BSM_DIRECT:

			mode = RV3032_PMU_BSM_DSM;

			break;

		case RTC_BSM_LEVEL:

			mode = RV3032_PMU_BSM_LSM;

			break;

		default:

			return -EINVAL;

		}



		return rv3032_update_cfg(rv3032, RV3032_PMU, RV3032_PMU_BSM,

					 FIELD_PREP(RV3032_PMU_BSM, mode));



	default:

		return -EINVAL;

	}



	return 0;

}



static int rv3032_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)

{

	struct rv3032_data *rv3032 = dev_get_drvdata(dev);
@@ -541,6 +611,8 @@ static int rv3032_trickle_charger_setup(struct device *dev, struct rv3032_data * 
		return 0;

	}



	rv3032->trickle_charger_set = true;



	return rv3032_update_cfg(rv3032, RV3032_PMU,

				 RV3032_PMU_TCR | RV3032_PMU_TCM | RV3032_PMU_BSM,

				 val | FIELD_PREP(RV3032_PMU_TCR, i));
@@ -813,6 +885,8 @@ static const struct rtc_class_ops rv3032_rtc_ops = { 
	.read_alarm = rv3032_get_alarm,

	.set_alarm = rv3032_set_alarm,

	.alarm_irq_enable = rv3032_alarm_irq_enable,

	.param_get = rv3032_param_get,

	.param_set = rv3032_param_set,

};



static const struct regmap_config regmap_config = {
@@ -883,6 +957,8 @@ static int rv3032_probe(struct i2c_client *client) 


	rv3032_trickle_charger_setup(&client->dev, rv3032);



	set_bit(RTC_FEATURE_BACKUP_SWITCH_MODE, rv3032->rtc->features);



	rv3032->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;

	rv3032->rtc->range_max = RTC_TIMESTAMP_END_2099;

	rv3032->rtc->ops = &rv3032_rtc_ops;