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rtc: rv3028: add BSM support

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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: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211018151933.76865-7-alexandre.belloni@bootlin.com
This commit is contained in:
Alexandre Belloni 2021-10-18 17:19:32 +02:00
parent 0d20e9fb12
commit 018d959ba7
1 changed files with 74 additions and 0 deletions
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74
drivers/rtc/rtc-rv3028.c
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@ -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 @@ exit_eerd:
}
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;