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power: supply: cpcap-battery: Fix handling of lowered charger voltage 

With cpcap-charger now using 4.2V instead of 4.35V, we never reach
POWER_SUPPLY_CAPACITY_LEVEL_FULL unless we handle the lowered charge
voltage.

Let's do this by implementing POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
and assume anything at that level or higher is a full battery.

Let's also make it configurable for users who may still want to
reconfigure it, and notify the charger if supported by the charger.

Cc: Merlijn Wajer <merlijn@wizzup.org>
Cc: Pavel Machek <pavel@ucw.cz>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Tony Lindgren 2019-10-16 15:41:21 -07:00 committed by Sebastian Reichel
parent 50fc99f83f
commit 8b0134cc14
1 changed files with 78 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

85
drivers/power/supply/cpcap-battery.c
View File

@ -79,6 +79,7 @@ struct cpcap_battery_config {
int ccm;
int cd_factor;
struct power_supply_info info;
struct power_supply_battery_info bat;
};
struct cpcap_coulomb_counter_data {
@ -369,8 +370,8 @@ static bool cpcap_battery_full(struct cpcap_battery_ddata *ddata)
{
struct cpcap_battery_state_data *state = cpcap_battery_latest(ddata);
/* Basically anything that measures above 4347000 is full */
if (state->voltage >= (ddata->config.info.voltage_max_design - 4000))
if (state->voltage >=
(ddata->config.bat.constant_charge_voltage_max_uv - 18000))
return true;
return false;
@ -417,6 +418,7 @@ static enum power_supply_property cpcap_battery_props[] = {
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
@ -475,6 +477,9 @@ static int cpcap_battery_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
val->intval = ddata->config.info.voltage_min_design;
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
val->intval = ddata->config.bat.constant_charge_voltage_max_uv;
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
sample = latest->cc.sample - previous->cc.sample;
if (!sample) {
@ -540,6 +545,69 @@ static int cpcap_battery_get_property(struct power_supply *psy,
return 0;
}
static int cpcap_battery_update_charger(struct cpcap_battery_ddata *ddata,
int const_charge_voltage)
{
union power_supply_propval prop;
union power_supply_propval val;
struct power_supply *charger;
int error;
charger = power_supply_get_by_name("usb");
if (!charger)
return -ENODEV;
error = power_supply_get_property(charger,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
&prop);
if (error)
return error;
/* Allow charger const voltage lower than battery const voltage */
if (const_charge_voltage > prop.intval)
return 0;
val.intval = const_charge_voltage;
return power_supply_set_property(charger,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
&val);
}
static int cpcap_battery_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct cpcap_battery_ddata *ddata = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
if (val->intval < ddata->config.info.voltage_min_design)
return -EINVAL;
if (val->intval > ddata->config.info.voltage_max_design)
return -EINVAL;
ddata->config.bat.constant_charge_voltage_max_uv = val->intval;
return cpcap_battery_update_charger(ddata, val->intval);
default:
return -EINVAL;
}
return 0;
}
static int cpcap_battery_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
return 1;
default:
return 0;
}
}
static irqreturn_t cpcap_battery_irq_thread(int irq, void *data)
{
struct cpcap_battery_ddata *ddata = data;
@ -695,6 +763,7 @@ static const struct cpcap_battery_config cpcap_battery_default_data = {
.info.voltage_max_design = 4351000,
.info.voltage_min_design = 3100000,
.info.charge_full_design = 1740000,
.bat.constant_charge_voltage_max_uv = 4200000,
};
#ifdef CONFIG_OF
@ -762,11 +831,13 @@ static int cpcap_battery_probe(struct platform_device *pdev)
if (!psy_desc)
return -ENOMEM;
psy_desc->name = "battery",
psy_desc->type = POWER_SUPPLY_TYPE_BATTERY,
psy_desc->properties = cpcap_battery_props,
psy_desc->num_properties = ARRAY_SIZE(cpcap_battery_props),
psy_desc->get_property = cpcap_battery_get_property,
psy_desc->name = "battery";
psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
psy_desc->properties = cpcap_battery_props;
psy_desc->num_properties = ARRAY_SIZE(cpcap_battery_props);
psy_desc->get_property = cpcap_battery_get_property;
psy_desc->set_property = cpcap_battery_set_property;
psy_desc->property_is_writeable = cpcap_battery_property_is_writeable;
psy_cfg.of_node = pdev->dev.of_node;
psy_cfg.drv_data = ddata;