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power: supply: core: Add power_supply_battery_info and API 

power_supply_get_battery_info() reads battery data from devicetree.
struct power_supply_battery_info provides battery data to drivers.
Its fields correspond to elements in enum power_supply_property.
Drivers may surface battery data in sysfs via corresponding
POWER_SUPPLY_PROP_* fields.

Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
Signed-off-by: Liam Breck <kernel@networkimprov.net>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Liam Breck 2017-06-07 11:37:51 -07:00 committed by Sebastian Reichel
parent 230670479a
commit c08b1f45d7
3 changed files with 91 additions and 0 deletions
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12
Documentation/power/power_supply_class.txt
View File

@ -174,6 +174,18 @@ issued by external power supply will notify supplicants via
external_power_changed callback.
Devicetree battery characteristics
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Drivers should call power_supply_get_battery_info() to obtain battery
characteristics from a devicetree battery node, defined in
Documentation/devicetree/bindings/power/supply/battery.txt. This is
implemented in drivers/power/supply/bq27xxx_battery.c.
Properties in struct power_supply_battery_info and their counterparts in the
battery node have names corresponding to elements in enum power_supply_property,
for naming consistency between sysfs attributes and battery node properties.
QA
~~
Q: Where is POWER_SUPPLY_PROP_XYZ attribute?

57
drivers/power/supply/power_supply_core.c
View File

@ -17,6 +17,7 @@
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/err.h>
#include <linux/of.h>
#include <linux/power_supply.h>
#include <linux/thermal.h>
#include "power_supply.h"
@ -519,6 +520,62 @@ struct power_supply *devm_power_supply_get_by_phandle(struct device *dev,
EXPORT_SYMBOL_GPL(devm_power_supply_get_by_phandle);
#endif /* CONFIG_OF */
int power_supply_get_battery_info(struct power_supply *psy,
struct power_supply_battery_info *info)
{
struct device_node *battery_np;
const char *value;
int err;
info->energy_full_design_uwh = -EINVAL;
info->charge_full_design_uah = -EINVAL;
info->voltage_min_design_uv = -EINVAL;
info->precharge_current_ua = -EINVAL;
info->charge_term_current_ua = -EINVAL;
info->constant_charge_current_max_ua = -EINVAL;
info->constant_charge_voltage_max_uv = -EINVAL;
if (!psy->of_node) {
dev_warn(&psy->dev, "%s currently only supports devicetree\n",
__func__);
return -ENXIO;
}
battery_np = of_parse_phandle(psy->of_node, "monitored-battery", 0);
if (!battery_np)
return -ENODEV;
err = of_property_read_string(battery_np, "compatible", &value);
if (err)
return err;
if (strcmp("simple-battery", value))
return -ENODEV;
/* The property and field names below must correspond to elements
* in enum power_supply_property. For reasoning, see
* Documentation/power/power_supply_class.txt.
*/
of_property_read_u32(battery_np, "energy-full-design-microwatt-hours",
&info->energy_full_design_uwh);
of_property_read_u32(battery_np, "charge-full-design-microamp-hours",
&info->charge_full_design_uah);
of_property_read_u32(battery_np, "voltage-min-design-microvolt",
&info->voltage_min_design_uv);
of_property_read_u32(battery_np, "precharge-current-microamp",
&info->precharge_current_ua);
of_property_read_u32(battery_np, "charge-term-current-microamp",
&info->charge_term_current_ua);
of_property_read_u32(battery_np, "constant_charge_current_max_microamp",
&info->constant_charge_current_max_ua);
of_property_read_u32(battery_np, "constant_charge_voltage_max_microvolt",
&info->constant_charge_voltage_max_uv);
return 0;
}
EXPORT_SYMBOL_GPL(power_supply_get_battery_info);
int power_supply_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)

22
include/linux/power_supply.h
View File

@ -289,6 +289,25 @@ struct power_supply_info {
int use_for_apm;
};
/*
* This is the recommended struct to manage static battery parameters,
* populated by power_supply_get_battery_info(). Most platform drivers should
* use these for consistency.
* Its field names must correspond to elements in enum power_supply_property.
* The default field value is -EINVAL.
* Power supply class itself doesn't use this.
*/
struct power_supply_battery_info {
int energy_full_design_uwh; /* microWatt-hours */
int charge_full_design_uah; /* microAmp-hours */
int voltage_min_design_uv; /* microVolts */
int precharge_current_ua; /* microAmps */
int charge_term_current_ua; /* microAmps */
int constant_charge_current_max_ua; /* microAmps */
int constant_charge_voltage_max_uv; /* microVolts */
};
extern struct atomic_notifier_head power_supply_notifier;
extern int power_supply_reg_notifier(struct notifier_block *nb);
extern void power_supply_unreg_notifier(struct notifier_block *nb);
@ -307,6 +326,9 @@ static inline struct power_supply *
devm_power_supply_get_by_phandle(struct device *dev, const char *property)
{ return NULL; }
#endif /* CONFIG_OF */
extern int power_supply_get_battery_info(struct power_supply *psy,
struct power_supply_battery_info *info);
extern void power_supply_changed(struct power_supply *psy);
extern int power_supply_am_i_supplied(struct power_supply *psy);
extern int power_supply_set_battery_charged(struct power_supply *psy);