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power: bq24257: Allow input current limit sysfs access
This patch allows reading and writing of the input current limit through the power supply's input_current_limit sysfs property. This allows userspace to see what charger was detected (if the D+/D- USB signal- based charger type detection is enabled) and to re-configure the maximum current drawn from the external supply at runtime based on system-level knowledge or user input. Note that upon charger disconnection and re-connection the limit configured through firmware becomes active again (or the D+/D- USB signal-based charger detection will be run again). Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com> Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
parent
138606ffe4
commit
0cfbfde65a
1 changed files with 79 additions and 6 deletions
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@ -267,6 +267,47 @@ enum bq24257_fault {
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FAULT_INPUT_LDO_LOW,
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};
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static int bq24257_get_input_current_limit(struct bq24257_device *bq,
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union power_supply_propval *val)
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{
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int ret;
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ret = bq24257_field_read(bq, F_IILIMIT);
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if (ret < 0)
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return ret;
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/*
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* The "External ILIM" and "Production & Test" modes are not exposed
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* through this driver and not being covered by the lookup table.
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* Should such a mode have become active let's return an error rather
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* than exceeding the bounds of the lookup table and returning
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* garbage.
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*/
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if (ret >= BQ24257_IILIMIT_MAP_SIZE)
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return -ENODATA;
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val->intval = bq24257_iilimit_map[ret];
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return 0;
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}
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static int bq24257_set_input_current_limit(struct bq24257_device *bq,
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const union power_supply_propval *val)
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{
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/*
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* Address the case where the user manually sets an input current limit
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* while the charger auto-detection mechanism is is active. In this
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* case we want to abort and go straight to the user-specified value.
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*/
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if (bq->iilimit_autoset_enable)
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cancel_delayed_work_sync(&bq->iilimit_setup_work);
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return bq24257_field_write(bq, F_IILIMIT,
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bq24257_find_idx(val->intval,
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bq24257_iilimit_map,
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BQ24257_IILIMIT_MAP_SIZE));
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}
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static int bq24257_power_supply_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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@ -351,6 +392,9 @@ static int bq24257_power_supply_get_property(struct power_supply *psy,
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val->intval = bq24257_iterm_map[bq->init_data.iterm];
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break;
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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return bq24257_get_input_current_limit(bq, val);
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default:
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return -EINVAL;
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}
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@ -358,6 +402,31 @@ static int bq24257_power_supply_get_property(struct power_supply *psy,
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return 0;
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}
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static int bq24257_power_supply_set_property(struct power_supply *psy,
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enum power_supply_property prop,
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const union power_supply_propval *val)
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{
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struct bq24257_device *bq = power_supply_get_drvdata(psy);
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switch (prop) {
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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return bq24257_set_input_current_limit(bq, val);
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default:
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return -EINVAL;
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}
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}
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static int bq24257_power_supply_property_is_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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switch (psp) {
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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return true;
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default:
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return false;
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}
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}
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static int bq24257_get_chip_state(struct bq24257_device *bq,
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struct bq24257_state *state)
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{
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@ -559,13 +628,14 @@ static void bq24257_handle_state_change(struct bq24257_device *bq,
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ret = bq24257_field_write(bq, F_DPDM_EN, 1);
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if (ret < 0)
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goto error;
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/* reset input current limit */
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ret = bq24257_field_write(bq, F_IILIMIT,
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bq->init_data.iilimit);
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if (ret < 0)
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goto error;
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}
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/*
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* When power is removed always return to the default input
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* current limit as configured during probe.
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*/
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ret = bq24257_field_write(bq, F_IILIMIT, bq->init_data.iilimit);
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if (ret < 0)
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goto error;
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} else if (!old_state.power_good) {
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dev_dbg(bq->dev, "Power inserted\n");
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@ -682,6 +752,7 @@ static enum power_supply_property bq24257_power_supply_props[] = {
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POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
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POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
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POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
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POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
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};
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static char *bq24257_charger_supplied_to[] = {
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@ -694,6 +765,8 @@ static const struct power_supply_desc bq24257_power_supply_desc = {
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.properties = bq24257_power_supply_props,
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.num_properties = ARRAY_SIZE(bq24257_power_supply_props),
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.get_property = bq24257_power_supply_get_property,
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.set_property = bq24257_power_supply_set_property,
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.property_is_writeable = bq24257_power_supply_property_is_writeable,
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};
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static ssize_t bq24257_show_ovp_voltage(struct device *dev,
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