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power: supply: core: Parse battery chemistry/technology

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This extends the struct power_supply_battery_info with a
"technology" field makes the core DT parser optionally obtain
this from the device tree.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Linus Walleij 2021-08-05 10:58:28 +02:00 committed by Sebastian Reichel
parent b171cb623c
commit 4eef766b7d
2 changed files with 21 additions and 0 deletions
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20
drivers/power/supply/power_supply_core.c
View file

@ -571,6 +571,7 @@ int power_supply_get_battery_info(struct power_supply *psy,
int err, len, index;
const __be32 *list;
info->technology = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
info->energy_full_design_uwh = -EINVAL;
info->charge_full_design_uah = -EINVAL;
info->voltage_min_design_uv = -EINVAL;
@ -618,6 +619,25 @@ int power_supply_get_battery_info(struct power_supply *psy,
* Documentation/power/power_supply_class.rst.
*/
err = of_property_read_string(battery_np, "device-chemistry", &value);
if (!err) {
if (!strcmp("nickel-cadmium", value))
info->technology = POWER_SUPPLY_TECHNOLOGY_NiCd;
else if (!strcmp("nickel-metal-hydride", value))
info->technology = POWER_SUPPLY_TECHNOLOGY_NiMH;
else if (!strcmp("lithium-ion", value))
/* Imprecise lithium-ion type */
info->technology = POWER_SUPPLY_TECHNOLOGY_LION;
else if (!strcmp("lithium-ion-polymer", value))
info->technology = POWER_SUPPLY_TECHNOLOGY_LIPO;
else if (!strcmp("lithium-ion-iron-phosphate", value))
info->technology = POWER_SUPPLY_TECHNOLOGY_LiFe;
else if (!strcmp("lithium-ion-manganese-oxide", value))
info->technology = POWER_SUPPLY_TECHNOLOGY_LiMn;
else
dev_warn(&psy->dev, "%s unknown battery type\n", value);
}
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",

1
include/linux/power_supply.h
View file

@ -352,6 +352,7 @@ struct power_supply_resistance_temp_table {
*/
struct power_supply_battery_info {
unsigned int technology; /* from the enum above */
int energy_full_design_uwh; /* microWatt-hours */
int charge_full_design_uah; /* microAmp-hours */
int voltage_min_design_uv; /* microVolts */