From: Stefan Raufhake <s.raufhake@xxxxxxxxxxx>
Some GPIO-controlled power supplies can be turned off (charging disabled).
Support changing the charging state by setting charge_type to
POWER_SUPPLY_CHARGE_TYPE_STANDARD and disabling charging by setting
charge_type to POWER_SUPPLY_CHARGE_TYPE_NONE. One potential use case for
this is disabling battery backup on a UPS.
Signed-off-by: Stefan Raufhake <s.raufhake@xxxxxxxxxxx>
---
.../bindings/power/supply/gpio-charger.yaml | 6 +++
drivers/power/supply/gpio-charger.c | 43 +++++++++++++++++++
2 files changed, 49 insertions(+)
diff --git a/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
index 89f8e2bcb2d7..084520bfc040 100644
--- a/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
+++ b/Documentation/devicetree/bindings/power/supply/gpio-charger.yaml
@@ -44,6 +44,10 @@ properties:
maxItems: 32
description: GPIOs used for current limiting
+ enable-gpios:
+ maxItems: 1
+ description: GPIO is used to enable/disable the charger
+
charge-current-limit-mapping:
description: List of tuples with current in uA and a GPIO bitmap (in
this order). The tuples must be provided in descending order of the
@@ -68,6 +72,8 @@ anyOf:
- charge-status-gpios
- required:
- charge-current-limit-gpios
+ - required:
+ - enable-gpios
dependencies:
charge-current-limit-gpios: [ charge-current-limit-mapping ]
diff --git a/drivers/power/supply/gpio-charger.c b/drivers/power/supply/gpio-charger.c
index 68212b39785b..461fec34904d 100644
--- a/drivers/power/supply/gpio-charger.c
+++ b/drivers/power/supply/gpio-charger.c
@@ -32,6 +32,7 @@ struct gpio_charger {
struct power_supply_desc charger_desc;
struct gpio_desc *gpiod;
struct gpio_desc *charge_status;
+ struct gpio_desc *charge_type;
struct gpio_descs *current_limit_gpios;
struct gpio_mapping *current_limit_map;
@@ -82,6 +83,26 @@ static int set_charge_current_limit(struct gpio_charger *gpio_charger, int val)
return 0;
}
+static int gpio_charger_set_charge_type(struct gpio_desc *gpio_charger, int type)
+{
+ int chg_config = 0;
+
+ switch (type) {
+ case POWER_SUPPLY_CHARGE_TYPE_STANDARD:
+ chg_config = 1;
+ break;
+ case POWER_SUPPLY_CHARGE_TYPE_NONE:
+ chg_config = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ gpiod_set_value_cansleep(gpio_charger, chg_config);
+
+ return 0;
+}
+
static int gpio_charger_get_property(struct power_supply *psy,
enum power_supply_property psp, union power_supply_propval *val)
{
@@ -100,6 +121,13 @@ static int gpio_charger_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
val->intval = gpio_charger->charge_current_limit;
break;
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ if (gpiod_get_value_cansleep(gpio_charger->charge_type))
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
+ else
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
+ break;
+
default:
return -EINVAL;
}
@@ -115,6 +143,9 @@ static int gpio_charger_set_property(struct power_supply *psy,
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
return set_charge_current_limit(gpio_charger, val->intval);
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ return gpio_charger_set_charge_type(gpio_charger->charge_type, val->intval);
+ break;
default:
return -EINVAL;
}
@@ -126,6 +157,7 @@ static int gpio_charger_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
return 1;
default:
@@ -246,6 +278,7 @@ static enum power_supply_property gpio_charger_properties[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+ POWER_SUPPLY_PROP_CHARGE_TYPE,
};
static int gpio_charger_probe(struct platform_device *pdev)
@@ -256,6 +289,7 @@ static int gpio_charger_probe(struct platform_device *pdev)
struct gpio_charger *gpio_charger;
struct power_supply_desc *charger_desc;
struct gpio_desc *charge_status;
+ struct gpio_desc *charge_type;
int charge_status_irq;
int ret;
int num_props = 0;
@@ -304,6 +338,15 @@ static int gpio_charger_probe(struct platform_device *pdev)
num_props++;
}
+ charge_type = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(charge_type))
+ return PTR_ERR(charge_type);
+ if (charge_type) {
+ gpio_charger->charge_type = charge_type;
+ gpio_charger_properties[num_props] = POWER_SUPPLY_PROP_CHARGE_TYPE;
+ num_props++;
+ }
+
charger_desc = &gpio_charger->charger_desc;
charger_desc->properties = gpio_charger_properties;
charger_desc->num_properties = num_props;
--
2.25.1
