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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>
hifive-unleashed-5.1
Andreas Dannenberg 2015-09-28 17:33:59 -05:00 committed by Sebastian Reichel
parent 138606ffe4
commit 0cfbfde65a
1 changed files with 79 additions and 6 deletions
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85
drivers/power/bq24257_charger.c
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@ -267,6 +267,47 @@ enum bq24257_fault {
FAULT_INPUT_LDO_LOW,
};
static int bq24257_get_input_current_limit(struct bq24257_device *bq,
union power_supply_propval *val)
{
int ret;
ret = bq24257_field_read(bq, F_IILIMIT);
if (ret < 0)
return ret;
/*
* The "External ILIM" and "Production & Test" modes are not exposed
* through this driver and not being covered by the lookup table.
* Should such a mode have become active let's return an error rather
* than exceeding the bounds of the lookup table and returning
* garbage.
*/
if (ret >= BQ24257_IILIMIT_MAP_SIZE)
return -ENODATA;
val->intval = bq24257_iilimit_map[ret];
return 0;
}
static int bq24257_set_input_current_limit(struct bq24257_device *bq,
const union power_supply_propval *val)
{
/*
* Address the case where the user manually sets an input current limit
* while the charger auto-detection mechanism is is active. In this
* case we want to abort and go straight to the user-specified value.
*/
if (bq->iilimit_autoset_enable)
cancel_delayed_work_sync(&bq->iilimit_setup_work);
return bq24257_field_write(bq, F_IILIMIT,
bq24257_find_idx(val->intval,
bq24257_iilimit_map,
BQ24257_IILIMIT_MAP_SIZE));
}
static int bq24257_power_supply_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
@ -351,6 +392,9 @@ static int bq24257_power_supply_get_property(struct power_supply *psy,
val->intval = bq24257_iterm_map[bq->init_data.iterm];
break;
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return bq24257_get_input_current_limit(bq, val);
default:
return -EINVAL;
}
@ -358,6 +402,31 @@ static int bq24257_power_supply_get_property(struct power_supply *psy,
return 0;
}
static int bq24257_power_supply_set_property(struct power_supply *psy,
enum power_supply_property prop,
const union power_supply_propval *val)
{
struct bq24257_device *bq = power_supply_get_drvdata(psy);
switch (prop) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return bq24257_set_input_current_limit(bq, val);
default:
return -EINVAL;
}
}
static int bq24257_power_supply_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
return true;
default:
return false;
}
}
static int bq24257_get_chip_state(struct bq24257_device *bq,
struct bq24257_state *state)
{
@ -559,13 +628,14 @@ static void bq24257_handle_state_change(struct bq24257_device *bq,
ret = bq24257_field_write(bq, F_DPDM_EN, 1);
if (ret < 0)
goto error;
/* reset input current limit */
ret = bq24257_field_write(bq, F_IILIMIT,
bq->init_data.iilimit);
if (ret < 0)
goto error;
}
/*
* When power is removed always return to the default input
* current limit as configured during probe.
*/
ret = bq24257_field_write(bq, F_IILIMIT, bq->init_data.iilimit);
if (ret < 0)
goto error;
} else if (!old_state.power_good) {
dev_dbg(bq->dev, "Power inserted\n");
@ -682,6 +752,7 @@ static enum power_supply_property bq24257_power_supply_props[] = {
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
};
static char *bq24257_charger_supplied_to[] = {
@ -694,6 +765,8 @@ static const struct power_supply_desc bq24257_power_supply_desc = {
.properties = bq24257_power_supply_props,
.num_properties = ARRAY_SIZE(bq24257_power_supply_props),
.get_property = bq24257_power_supply_get_property,
.set_property = bq24257_power_supply_set_property,
.property_is_writeable = bq24257_power_supply_property_is_writeable,
};
static ssize_t bq24257_show_ovp_voltage(struct device *dev,