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power: supply: ltc2941-battery-gauge: Add charge empty and full properties 

Add properties for charge empty and charge full thresholds.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
This commit is contained in:
Ladislav Michl 2018-01-17 20:48:54 +01:00 committed by Sebastian Reichel
parent 6ab739bc1d
commit 3bf4e03d19
1 changed files with 50 additions and 9 deletions
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59
drivers/power/supply/ltc2941-battery-gauge.c
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@ -34,6 +34,10 @@ enum ltc294x_reg {
LTC294X_REG_CONTROL = 0x01,
LTC294X_REG_ACC_CHARGE_MSB = 0x02,
LTC294X_REG_ACC_CHARGE_LSB = 0x03,
LTC294X_REG_CHARGE_THR_HIGH_MSB = 0x04,
LTC294X_REG_CHARGE_THR_HIGH_LSB = 0x05,
LTC294X_REG_CHARGE_THR_LOW_MSB = 0x06,
LTC294X_REG_CHARGE_THR_LOW_LSB = 0x07,
LTC294X_REG_VOLTAGE_MSB = 0x08,
LTC294X_REG_VOLTAGE_LSB = 0x09,
LTC2942_REG_TEMPERATURE_MSB = 0x0C,
@ -179,21 +183,22 @@ static int ltc294x_reset(const struct ltc294x_info *info, int prescaler_exp)
return ret;
}
static int ltc294x_read_charge_register(const struct ltc294x_info *info)
{
static int ltc294x_read_charge_register(const struct ltc294x_info *info,
enum ltc294x_reg reg)
{
int ret;
u8 datar[2];
ret = ltc294x_read_regs(info->client,
LTC294X_REG_ACC_CHARGE_MSB, &datar[0], 2);
ret = ltc294x_read_regs(info->client, reg, &datar[0], 2);
if (ret < 0)
return ret;
return (datar[0] << 8) + datar[1];
}
static int ltc294x_get_charge_now(const struct ltc294x_info *info, int *val)
static int ltc294x_get_charge(const struct ltc294x_info *info,
enum ltc294x_reg reg, int *val)
{
int value = ltc294x_read_charge_register(info);
int value = ltc294x_read_charge_register(info, reg);
if (value < 0)
return value;
@ -245,10 +250,29 @@ static int ltc294x_set_charge_now(const struct ltc294x_info *info, int val)
return ret < 0 ? ret : 0;
}
static int ltc294x_set_charge_thr(const struct ltc294x_info *info,
enum ltc294x_reg reg, int val)
{
u8 dataw[2];
s32 value;
value = convert_uAh_to_bin(info, val);
/* Direction depends on how sense+/- were connected */
if (info->Qlsb < 0)
value += 0xFFFF;
if ((value < 0) || (value > 0xFFFF)) /* input validation */
return -EINVAL;
/* Set new charge value */
dataw[0] = I16_MSB(value);
dataw[1] = I16_LSB(value);
return ltc294x_write_regs(info->client, reg, &dataw[0], 2);
}
static int ltc294x_get_charge_counter(
const struct ltc294x_info *info, int *val)
{
int value = ltc294x_read_charge_register(info);
int value = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB);
if (value < 0)
return value;
@ -336,8 +360,15 @@ static int ltc294x_get_property(struct power_supply *psy,
struct ltc294x_info *info = power_supply_get_drvdata(psy);
switch (prop) {
case POWER_SUPPLY_PROP_CHARGE_FULL:
return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_HIGH_MSB,
&val->intval);
case POWER_SUPPLY_PROP_CHARGE_EMPTY:
return ltc294x_get_charge(info, LTC294X_REG_CHARGE_THR_LOW_MSB,
&val->intval);
case POWER_SUPPLY_PROP_CHARGE_NOW:
return ltc294x_get_charge_now(info, &val->intval);
return ltc294x_get_charge(info, LTC294X_REG_ACC_CHARGE_MSB,
&val->intval);
case POWER_SUPPLY_PROP_CHARGE_COUNTER:
return ltc294x_get_charge_counter(info, &val->intval);
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
@ -358,6 +389,12 @@ static int ltc294x_set_property(struct power_supply *psy,
struct ltc294x_info *info = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_CHARGE_FULL:
return ltc294x_set_charge_thr(info,
LTC294X_REG_CHARGE_THR_HIGH_MSB, val->intval);
case POWER_SUPPLY_PROP_CHARGE_EMPTY:
return ltc294x_set_charge_thr(info,
LTC294X_REG_CHARGE_THR_LOW_MSB, val->intval);
case POWER_SUPPLY_PROP_CHARGE_NOW:
return ltc294x_set_charge_now(info, val->intval);
default:
@ -369,6 +406,8 @@ static int ltc294x_property_is_writeable(
struct power_supply *psy, enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_CHARGE_FULL:
case POWER_SUPPLY_PROP_CHARGE_EMPTY:
case POWER_SUPPLY_PROP_CHARGE_NOW:
return 1;
default:
@ -378,7 +417,7 @@ static int ltc294x_property_is_writeable(
static void ltc294x_update(struct ltc294x_info *info)
{
int charge = ltc294x_read_charge_register(info);
int charge = ltc294x_read_charge_register(info, LTC294X_REG_ACC_CHARGE_MSB);
if (charge != info->charge) {
info->charge = charge;
@ -397,6 +436,8 @@ static void ltc294x_work(struct work_struct *work)
static enum power_supply_property ltc294x_properties[] = {
POWER_SUPPLY_PROP_CHARGE_COUNTER,
POWER_SUPPLY_PROP_CHARGE_FULL,
POWER_SUPPLY_PROP_CHARGE_EMPTY,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_TEMP,