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rtc: rv3028: Add backup switchover mode support

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Signed-off-by: Phil Howard <phil@pimoroni.com>
This commit is contained in:
Phil Howard
2019-03-29 10:53:14 +00:00
committed by Dom Cobley
parent 8766820d28
commit 8b69b3465b
1 changed files with 18 additions and 6 deletions
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24
drivers/rtc/rtc-rv3028.c
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@@ -865,16 +865,17 @@ static const struct regmap_config regmap_config = {
static u8 rv3028_set_trickle_charger(struct rv3028_data *rv3028,
struct i2c_client *client)
{
int ret, val_old, val;
int ret, val_old, val, val_mask;
u32 ohms, chargeable;
u32 bsm;
ret = regmap_read(rv3028->regmap, RV3028_BACKUP, &val_old);
if (ret < 0)
return ret;
/* mask out only trickle charger bits */
val_old = val_old & (RV3028_BACKUP_TCE | RV3028_BACKUP_TCR_MASK);
val = val_old;
val_mask = RV3028_BACKUP_TCE | RV3028_BACKUP_TCR_MASK;
val = val_old & val_mask;
/* setup trickle charger */
if (!device_property_read_u32(&client->dev, "trickle-resistor-ohms",
@@ -909,10 +910,21 @@ static u8 rv3028_set_trickle_charger(struct rv3028_data *rv3028,
}
}
/* setup backup switchover mode */
if (!device_property_read_u32(&client->dev,
"backup-switchover-mode",
&bsm)) {
if (bsm <= 3) {
val_mask |= RV3028_BACKUP_BSM;
val |= (u8)(bsm << 2);
} else {
dev_warn(&client->dev, "invalid backup switchover mode value\n");
}
}
/* only update EEPROM if changes are necessary */
if (val_old != val) {
ret = rv3028_update_cfg(rv3028, RV3028_BACKUP, RV3028_BACKUP_TCE |
RV3028_BACKUP_TCR_MASK, val);
if ((val_old & val_mask) != val) {
ret = rv3028_update_cfg(rv3028, RV3028_BACKUP, val_mask, val);
if (ret)
return ret;
}