[PATCHv2 02/12] power: supply: core: auto-exposure of simple-battery data

From: Sebastian Reichel
Date: Tue Mar 14 2023 - 18:55:49 EST

Add support for automatically exposing data from the
simple-battery firmware node with a single configuration
option in the power-supply device.

Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx>
---
drivers/power/supply/power_supply_core.c | 173 +++++++++++++++++++---
drivers/power/supply/power_supply_sysfs.c | 15 ++
include/linux/power_supply.h | 8 +
3 files changed, 178 insertions(+), 18 deletions(-)

diff --git a/drivers/power/supply/power_supply_core.c b/drivers/power/supply/power_supply_core.c
index f3d7c1da299f..842c27de4fac 100644
--- a/drivers/power/supply/power_supply_core.c
+++ b/drivers/power/supply/power_supply_core.c
@@ -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 */
@@ -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
@@ -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)
@@ -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);

@@ -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)
@@ -1255,6 +1387,11 @@ __power_supply_register(struct device *parent,
goto check_supplies_failed;
}

+ /* psy->battery_info is optional */
+ rc = power_supply_get_battery_info(psy, &psy->battery_info);
+ if (rc && rc != -ENODEV)
+ goto check_supplies_failed;
+
spin_lock_init(&psy->changed_lock);
rc = device_add(dev);
if (rc)
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index c228205e0953..5842dfe5dfb7 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -380,6 +380,9 @@ 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;
}

@@ -461,6 +464,8 @@ 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;
int ret = 0, j;
char *prop_buf;

@@ -488,6 +493,16 @@ int power_supply_uevent(const struct device *dev, struct kobj_uevent_env *env)
goto out;
}

+ for (j = 0; j < power_supply_battery_info_properties_size; j++) {
+ 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);

diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index aa2c4a7c4826..a427f13c757f 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -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;
@@ -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 *
--
2.39.2