From 018d959ba7ffcadcc21e007f81c4b2b7a2b47447 Mon Sep 17 00:00:00 2001 From: Alexandre Belloni Date: Mon, 18 Oct 2021 17:19:32 +0200 Subject: 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: Alexandre Belloni Link: https://lore.kernel.org/r/20211018151933.76865-7-alexandre.belloni@bootlin.com --- drivers/rtc/rtc-rv3028.c | 74 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 74 insertions(+) (limited to 'drivers/rtc/rtc-rv3028.c') diff --git a/drivers/rtc/rtc-rv3028.c b/drivers/rtc/rtc-rv3028.c index 12c807306893..cdc623b3e365 100644 --- a/drivers/rtc/rtc-rv3028.c +++ b/drivers/rtc/rtc-rv3028.c @@ -10,6 +10,7 @@ #include #include +#include #include #include #include @@ -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; -- cgit