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power: supply: core: auto-exposure of simple-battery data
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Automatically expose data from the simple-battery firmware
node for all battery drivers.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Matti Vaittinen <mazziesaccount@gmail.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
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@sre
sre committed Mar 29, 2023
1 parent 25b8006 commit 27a2195
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Showing 3 changed files with 191 additions and 19 deletions.
179 changes: 161 additions & 18 deletions drivers/power/supply/power_supply_core.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -388,7 +388,7 @@ static int __power_supply_get_supplier_property(struct device *dev, void *_data)
struct psy_get_supplier_prop_data *data = _data;

if (__power_supply_is_supplied_by(epsy, data->psy))
if (!epsy->desc->get_property(epsy, data->psp, data->val))
if (!power_supply_get_property(epsy, data->psp, data->val))
return 1; /* Success */

return 0; /* Continue iterating */
Expand Down Expand Up @@ -832,6 +832,133 @@ void power_supply_put_battery_info(struct power_supply *psy,
}
EXPORT_SYMBOL_GPL(power_supply_put_battery_info);

const enum power_supply_property power_supply_battery_info_properties[] = {
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN,
POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX,
POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
POWER_SUPPLY_PROP_TEMP_MIN,
POWER_SUPPLY_PROP_TEMP_MAX,
};
EXPORT_SYMBOL_GPL(power_supply_battery_info_properties);

const size_t power_supply_battery_info_properties_size = ARRAY_SIZE(power_supply_battery_info_properties);
EXPORT_SYMBOL_GPL(power_supply_battery_info_properties_size);

bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
enum power_supply_property psp)
{
if (!info)
return false;

switch (psp) {
case POWER_SUPPLY_PROP_TECHNOLOGY:
return info->technology != POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
return info->energy_full_design_uwh >= 0;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
return info->charge_full_design_uah >= 0;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
return info->voltage_min_design_uv >= 0;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
return info->voltage_max_design_uv >= 0;
case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
return info->precharge_current_ua >= 0;
case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
return info->charge_term_current_ua >= 0;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
return info->constant_charge_current_max_ua >= 0;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
return info->constant_charge_voltage_max_uv >= 0;
case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
return info->temp_ambient_alert_min > INT_MIN;
case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
return info->temp_ambient_alert_max < INT_MAX;
case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
return info->temp_alert_min > INT_MIN;
case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
return info->temp_alert_max < INT_MAX;
case POWER_SUPPLY_PROP_TEMP_MIN:
return info->temp_min > INT_MIN;
case POWER_SUPPLY_PROP_TEMP_MAX:
return info->temp_max < INT_MAX;
default:
return false;
}
}
EXPORT_SYMBOL_GPL(power_supply_battery_info_has_prop);

int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
enum power_supply_property psp,
union power_supply_propval *val)
{
if (!info)
return -EINVAL;

if (!power_supply_battery_info_has_prop(info, psp))
return -EINVAL;

switch (psp) {
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = info->technology;
return 0;
case POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN:
val->intval = info->energy_full_design_uwh;
return 0;
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
val->intval = info->charge_full_design_uah;
return 0;
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
val->intval = info->voltage_min_design_uv;
return 0;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
val->intval = info->voltage_max_design_uv;
return 0;
case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
val->intval = info->precharge_current_ua;
return 0;
case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
val->intval = info->charge_term_current_ua;
return 0;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
val->intval = info->constant_charge_current_max_ua;
return 0;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
val->intval = info->constant_charge_voltage_max_uv;
return 0;
case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MIN:
val->intval = info->temp_ambient_alert_min;
return 0;
case POWER_SUPPLY_PROP_TEMP_AMBIENT_ALERT_MAX:
val->intval = info->temp_ambient_alert_max;
return 0;
case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
val->intval = info->temp_alert_min;
return 0;
case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
val->intval = info->temp_alert_max;
return 0;
case POWER_SUPPLY_PROP_TEMP_MIN:
val->intval = info->temp_min;
return 0;
case POWER_SUPPLY_PROP_TEMP_MAX:
val->intval = info->temp_max;
return 0;
default:
return -EINVAL;
}
}
EXPORT_SYMBOL_GPL(power_supply_battery_info_get_prop);

/**
* power_supply_temp2resist_simple() - find the battery internal resistance
* percent from temperature
Expand Down Expand Up @@ -1046,6 +1173,22 @@ bool power_supply_battery_bti_in_range(struct power_supply_battery_info *info,
}
EXPORT_SYMBOL_GPL(power_supply_battery_bti_in_range);

static bool psy_has_property(const struct power_supply_desc *psy_desc,
enum power_supply_property psp)
{
bool found = false;
int i;

for (i = 0; i < psy_desc->num_properties; i++) {
if (psy_desc->properties[i] == psp) {
found = true;
break;
}
}

return found;
}

int power_supply_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
Expand All @@ -1056,7 +1199,12 @@ int power_supply_get_property(struct power_supply *psy,
return -ENODEV;
}

return psy->desc->get_property(psy, psp, val);
if (psy_has_property(psy->desc, psp))
return psy->desc->get_property(psy, psp, val);
else if (power_supply_battery_info_has_prop(psy->battery_info, psp))
return power_supply_battery_info_get_prop(psy->battery_info, psp, val);
else
return -EINVAL;
}
EXPORT_SYMBOL_GPL(power_supply_get_property);

Expand Down Expand Up @@ -1117,22 +1265,6 @@ void power_supply_unreg_notifier(struct notifier_block *nb)
}
EXPORT_SYMBOL_GPL(power_supply_unreg_notifier);

static bool psy_has_property(const struct power_supply_desc *psy_desc,
enum power_supply_property psp)
{
bool found = false;
int i;

for (i = 0; i < psy_desc->num_properties; i++) {
if (psy_desc->properties[i] == psp) {
found = true;
break;
}
}

return found;
}

#ifdef CONFIG_THERMAL
static int power_supply_read_temp(struct thermal_zone_device *tzd,
int *temp)
Expand Down Expand Up @@ -1255,6 +1387,17 @@ __power_supply_register(struct device *parent,
goto check_supplies_failed;
}

/*
* Expose constant battery info, if it is available. While there are
* some chargers accessing constant battery data, we only want to
* expose battery data to userspace for battery devices.
*/
if (desc->type == POWER_SUPPLY_TYPE_BATTERY) {
rc = power_supply_get_battery_info(psy, &psy->battery_info);
if (rc && rc != -ENODEV && rc != -ENOENT)
goto check_supplies_failed;
}

spin_lock_init(&psy->changed_lock);
rc = device_add(dev);
if (rc)
Expand Down
23 changes: 22 additions & 1 deletion drivers/power/supply/power_supply_sysfs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -221,9 +221,10 @@ static struct power_supply_attr power_supply_attrs[] = {
POWER_SUPPLY_ATTR(MANUFACTURER),
POWER_SUPPLY_ATTR(SERIAL_NUMBER),
};
#define POWER_SUPPLY_ATTR_CNT ARRAY_SIZE(power_supply_attrs)

static struct attribute *
__power_supply_attrs[ARRAY_SIZE(power_supply_attrs) + 1];
__power_supply_attrs[POWER_SUPPLY_ATTR_CNT + 1];

static struct power_supply_attr *to_ps_attr(struct device_attribute *attr)
{
Expand Down Expand Up @@ -380,6 +381,9 @@ static umode_t power_supply_attr_is_visible(struct kobject *kobj,
}
}

if (power_supply_battery_info_has_prop(psy->battery_info, attrno))
return mode;

return 0;
}

Expand Down Expand Up @@ -461,6 +465,10 @@ static int add_prop_uevent(const struct device *dev, struct kobj_uevent_env *env
int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
{
const struct power_supply *psy = dev_get_drvdata(dev);
const enum power_supply_property *battery_props =
power_supply_battery_info_properties;
unsigned long psy_drv_properties[POWER_SUPPLY_ATTR_CNT /
sizeof(unsigned long) + 1] = {0};
int ret = 0, j;
char *prop_buf;

Expand All @@ -482,12 +490,25 @@ int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
goto out;

for (j = 0; j < psy->desc->num_properties; j++) {
set_bit(psy->desc->properties[j], psy_drv_properties);
ret = add_prop_uevent(dev, env, psy->desc->properties[j],
prop_buf);
if (ret)
goto out;
}

for (j = 0; j < power_supply_battery_info_properties_size; j++) {
if (test_bit(battery_props[j], psy_drv_properties))
continue;
if (!power_supply_battery_info_has_prop(psy->battery_info,
battery_props[j]))
continue;
ret = add_prop_uevent(dev, env, battery_props[j],
prop_buf);
if (ret)
goto out;
}

out:
free_page((unsigned long)prop_buf);

Expand Down
8 changes: 8 additions & 0 deletions include/linux/power_supply.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -301,6 +301,7 @@ struct power_supply {
bool initialized;
bool removing;
atomic_t use_cnt;
struct power_supply_battery_info *battery_info;
#ifdef CONFIG_THERMAL
struct thermal_zone_device *tzd;
struct thermal_cooling_device *tcd;
Expand Down Expand Up @@ -791,10 +792,17 @@ devm_power_supply_get_by_phandle(struct device *dev, const char *property)
{ return NULL; }
#endif /* CONFIG_OF */

extern const enum power_supply_property power_supply_battery_info_properties[];
extern const size_t power_supply_battery_info_properties_size;
extern int power_supply_get_battery_info(struct power_supply *psy,
struct power_supply_battery_info **info_out);
extern void power_supply_put_battery_info(struct power_supply *psy,
struct power_supply_battery_info *info);
extern bool power_supply_battery_info_has_prop(struct power_supply_battery_info *info,
enum power_supply_property psp);
extern int power_supply_battery_info_get_prop(struct power_supply_battery_info *info,
enum power_supply_property psp,
union power_supply_propval *val);
extern int power_supply_ocv2cap_simple(struct power_supply_battery_ocv_table *table,
int table_len, int ocv);
extern struct power_supply_battery_ocv_table *
Expand Down

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