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power: supply: act8945a_charger: Add capacity level property

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Add the power supply capacity level property, it corresponds to
POWER_SUPPLY_CAPACITY_LEVEL_*.

It also utilizes the precision voltage detector function module
to catch the low battery voltage.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Wenyou Yang 2016-09-01 17:29:58 +08:00 committed by Sebastian Reichel
parent 3095365080
commit 369eba0986
1 changed files with 78 additions and 1 deletions
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79
drivers/power/supply/act8945a_charger.c
View File

@ -18,6 +18,7 @@
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>
static const char *act8945a_charger_model = "ACT8945A";
static const char *act8945a_charger_manufacturer = "Active-semi";
@ -83,6 +84,7 @@ struct act8945a_charger {
struct work_struct work;
bool init_done;
struct gpio_desc *lbo_gpio;
};
static int act8945a_get_charger_state(struct regmap *regmap, int *val)
@ -208,11 +210,67 @@ static int act8945a_get_battery_health(struct regmap *regmap, int *val)
return 0;
}
static int act8945a_get_capacity_level(struct act8945a_charger *charger,
struct regmap *regmap, int *val)
{
int ret;
unsigned int status, state, config;
int lbo_level = gpiod_get_value(charger->lbo_gpio);
ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_CFG, &config);
if (ret < 0)
return ret;
ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
if (ret < 0)
return ret;
state &= APCH_STATE_CSTATE;
state >>= APCH_STATE_CSTATE_SHIFT;
switch (state) {
case APCH_STATE_CSTATE_PRE:
*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
break;
case APCH_STATE_CSTATE_FAST:
if (lbo_level)
*val = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
else
*val = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
break;
case APCH_STATE_CSTATE_EOC:
if (status & APCH_STATUS_CHGDAT)
*val = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
else
*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
break;
case APCH_STATE_CSTATE_DISABLED:
default:
if (config & APCH_CFG_SUSCHG) {
*val = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
} else {
*val = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
if (!(status & APCH_STATUS_INDAT)) {
if (!lbo_level)
*val = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
}
}
break;
}
return 0;
}
static enum power_supply_property act8945a_charger_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_TYPE,
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CAPACITY_LEVEL,
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER
};
@ -238,6 +296,10 @@ static int act8945a_charger_get_property(struct power_supply *psy,
case POWER_SUPPLY_PROP_HEALTH:
ret = act8945a_get_battery_health(regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
ret = act8945a_get_capacity_level(charger,
regmap, &val->intval);
break;
case POWER_SUPPLY_PROP_MODEL_NAME:
val->strval = act8945a_charger_model;
break;
@ -335,7 +397,7 @@ static int act8945a_charger_config(struct device *dev,
u32 pre_time_out;
u32 input_voltage_threshold;
int chglev_pin;
int ret;
int err, ret;
unsigned int tmp;
unsigned int value = 0;
@ -354,6 +416,21 @@ static int act8945a_charger_config(struct device *dev,
dev_info(dev, "have been suspended\n");
}
charger->lbo_gpio = devm_gpiod_get_optional(dev, "active-semi,lbo",
GPIOD_IN);
if (IS_ERR(charger->lbo_gpio)) {
err = PTR_ERR(charger->lbo_gpio);
dev_err(dev, "unable to claim gpio \"lbo\": %d\n", err);
return err;
}
ret = devm_request_irq(dev, gpiod_to_irq(charger->lbo_gpio),
act8945a_status_changed,
(IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING),
"act8945a_lbo_detect", charger);
if (ret)
dev_info(dev, "failed to request gpio \"lbo\" IRQ\n");
chglev_pin = of_get_named_gpio_flags(np,
"active-semi,chglev-gpios", 0, &flags);