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authorLadislav Michl <ladis@linux-mips.org>2018-01-17 20:48:54 +0100
committerSebastian Reichel <sre@kernel.org>2018-02-12 11:23:46 +0100
commit3bf4e03d199f7f2871919e33e7bfc6e3d4c3368f (patch)
treed2e4553bd5f642bca3968b8eefb476937968ea2a /drivers/power
parent6ab739bc1d00bfd10ed87a2f1fdc00ebdc0d7ff1 (diff)
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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>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/supply/ltc2941-battery-gauge.c59
1 files changed, 50 insertions, 9 deletions
diff --git a/drivers/power/supply/ltc2941-battery-gauge.c b/drivers/power/supply/ltc2941-battery-gauge.c
index 4cfa3f0cd689..9360faca7026 100644
--- a/drivers/power/supply/ltc2941-battery-gauge.c
+++ b/drivers/power/supply/ltc2941-battery-gauge.c
@@ -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 @@ error_exit:
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 @@ error_exit:
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,