/*
* Battery power supply driver for X-Powers AXP20X and AXP22X PMICs
*
* Copyright 2016 Free Electrons NextThing Co.
* Quentin Schulz <quentin.schulz@free-electrons.com>
*
* This driver is based on a previous upstreaming attempt by:
* Bruno Prémont <bonbons@linux-vserver.org>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/iio/iio.h>
#include <linux/iio/consumer.h>
#include <linux/mfd/axp20x.h>
#define AXP20X_PWR_STATUS_BAT_CHARGING BIT(2)
#define AXP20X_PWR_OP_BATT_PRESENT BIT(5)
#define AXP20X_PWR_OP_BATT_ACTIVATED BIT(3)
#define AXP209_FG_PERCENT GENMASK(6, 0)
#define AXP22X_FG_VALID BIT(7)
#define AXP20X_CHRG_CTRL1_TGT_VOLT GENMASK(6, 5)
#define AXP20X_CHRG_CTRL1_TGT_4_1V (0 << 5)
#define AXP20X_CHRG_CTRL1_TGT_4_15V (1 << 5)
#define AXP20X_CHRG_CTRL1_TGT_4_2V (2 << 5)
#define AXP20X_CHRG_CTRL1_TGT_4_36V (3 << 5)
#define AXP22X_CHRG_CTRL1_TGT_4_22V (1 << 5)
#define AXP22X_CHRG_CTRL1_TGT_4_24V (3 << 5)
#define AXP813_CHRG_CTRL1_TGT_4_35V (3 << 5)
#define AXP20X_CHRG_CTRL1_TGT_CURR GENMASK(3, 0)
#define AXP20X_V_OFF_MASK GENMASK(2, 0)
struct axp20x_batt_ps;
struct axp_data {
int ccc_scale;
int ccc_offset;
bool has_fg_valid;
int (*get_max_voltage)(struct axp20x_batt_ps *batt, int *val);
int (*set_max_voltage)(struct axp20x_batt_ps *batt, int val);
};
struct axp20x_batt_ps {
struct regmap *regmap;
struct power_supply *batt;
struct device *dev;
struct iio_channel *batt_chrg_i;
struct iio_channel *batt_dischrg_i;
struct iio_channel *batt_v;
/* Maximum constant charge current */
unsigned int max_ccc;
const struct axp_data *data;
};
static int axp20x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
int *val)
{
int ret, reg;
ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, ®);
if (ret)
return ret;
switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
case AXP20X_CHRG_CTRL1_TGT_4_1V:
*val = 4100000;
break;
case AXP20X_CHRG_CTRL1_TGT_4_15V:
*val = 4150000;
break;
case AXP20X_CHRG_CTRL1_TGT_4_2V:
*val = 4200000;
break;
case AXP20X_CHRG_CTRL1_TGT_4_36V:
*val = 4360000;
break;
default:
return -EINVAL;
}
return 0;
}
static int axp22x_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
int *val)
{
int ret, reg;
ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, ®);
if (ret)
return ret;
switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
case AXP20X_CHRG_CTRL1_TGT_4_1V:
*val = 4100000;
break;
case AXP20X_CHRG_CTRL1_TGT_4_2V:
*val = 4200000;
break;
case AXP22X_CHRG_CTRL1_TGT_4_22V:
*val = 4220000;
break;
case AXP22X_CHRG_CTRL1_TGT_4_24V:
*val = 4240000;
break;
default:
return -EINVAL;
}
return 0;
}
static int axp813_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
int *val)
{
int ret, reg;
ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, ®);
if (ret)
return ret;
switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
case AXP20X_CHRG_CTRL1_TGT_4_1V:
*val = 4100000;
break;
case AXP20X_CHRG_CTRL1_TGT_4_15V:
*val = 4150000;
break;
case AXP20X_CHRG_CTRL1_TGT_4_2V:
*val = 4200000;
break;
case AXP813_CHRG_CTRL1_TGT_4_35V:
*val = 4350000;
break;
default:
return -EINVAL;
}
return 0;
}
static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp,
int *val)
{
int ret;
ret = regmap_read(axp->regmap, AXP20X_CHRG_CTRL1, val);
if (ret)
return ret;
*val &= AXP20X_CHRG_CTRL1_TGT_CURR;
*val = *val * axp->data->ccc_scale + axp->data->ccc_offset;
return 0;
}
static int axp20x_battery_get_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy);
struct iio_channel *chan;
int ret = 0, reg, val1;
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
case POWER_SUPPLY_PROP_ONLINE:
ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
®);
if (ret)
return ret;
val->intval = !!(reg & AXP20X_PWR_OP_BATT_PRESENT);
break;
case POWER_SUPPLY_PROP_STATUS:
ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS,
®);
if (ret)
return ret;
if (reg & AXP20X_PWR_STATUS_BAT_CHARGING) {
val->intval = POWER_SUPPLY_STATUS_CHARGING;
return 0;
}
ret = iio_read_channel_processed(axp20x_batt->batt_dischrg_i,
&val1);
if (ret)
return ret;
if (val1) {
val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
return 0;
}
ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, &val1);
if (ret)
return ret;
/*
* Fuel Gauge data takes 7 bits but the stored value seems to be
* directly the raw percentage without any scaling to 7 bits.
*/
if ((val1 & AXP209_FG_PERCENT) == 100)
val->intval = POWER_SUPPLY_STATUS_FULL;
else
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
case POWER_SUPPLY_PROP_HEALTH:
ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
&val1);
if (ret)
return ret;
if (val1 & AXP20X_PWR_OP_BATT_ACTIVATED) {
val->intval = POWER_SUPPLY_HEALTH_DEAD;
return 0;
}
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
ret = axp20x_get_constant_charge_current(axp20x_batt,
&val->intval);
if (ret)
return ret;
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
val->intval = axp20x_batt->max_ccc;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_INPUT_STATUS,
®);
if (ret)
return ret;
if (reg & AXP20X_PWR_STATUS_BAT_CHARGING)
chan = axp20x_batt->batt_chrg_i;
else
chan = axp20x_batt->batt_dischrg_i;
ret = iio_read_channel_processed(chan, &val->intval);
if (ret)
return ret;
/* IIO framework gives mA but Power Supply framework gives uA */
val->intval *= 1000;
break;
case POWER_SUPPLY_PROP_CAPACITY:
/* When no battery is present, return capacity is 100% */
ret = regmap_read(axp20x_batt->regmap, AXP20X_PWR_OP_MODE,
®);
if (ret)
return ret;
if (!(reg & AXP20X_PWR_OP_BATT_PRESENT)) {
val->intval = 100;
return 0;
}
ret = regmap_read(axp20x_batt->regmap, AXP20X_FG_RES, ®);
if (ret)
return ret;
if (axp20x_batt->data->has_fg_valid && !(reg & AXP22X_FG_VALID))
return -EINVAL;
/*
* Fuel Gauge data takes 7 bits but the stored value seems to be
* directly the raw percentage without any scaling to 7 bits.
*/
val->intval = reg & AXP209_FG_PERCENT;
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
return axp20x_batt->data->get_max_voltage(axp20x_batt,
&val->intval);
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
ret = regmap_read(axp20x_batt->regmap, AXP20X_V_OFF, ®);
if (ret)
return ret;
val->intval = 2600000 + 100000 * (reg & AXP20X_V_OFF_MASK);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = iio_read_channel_processed(axp20x_batt->batt_v,
&val->intval);
if (ret)
return ret;
/* IIO framework gives mV but Power Supply framework gives uV */
val->intval *= 1000;
break;
default:
return -EINVAL;
}
return 0;
}
static int axp22x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
int val)
{
switch (val) {
case 4100000:
val = AXP20X_CHRG_CTRL1_TGT_4_1V;
break;
case 4200000:
val = AXP20X_CHRG_CTRL1_TGT_4_2V;
break;
default:
/*
* AXP20x max voltage can be set to 4.36V and AXP22X max voltage
* can be set to 4.22V and 4.24V, but these voltages are too
* high for Lithium based batteries (AXP PMICs are supposed to
* be used with these kinds of battery).
*/
return -EINVAL;
}
return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
AXP20X_CHRG_CTRL1_TGT_VOLT, val);
}
static int axp20x_battery_set_max_voltage(struct axp20x_batt_ps *axp20x_batt,
int val)
{
switch (val) {
case 4100000:
val = AXP20X_CHRG_CTRL1_TGT_4_1V;
break;
case 4150000:
val = AXP20X_CHRG_CTRL1_TGT_4_15V;
break;
case 4200000:
val = AXP20X_CHRG_CTRL1_TGT_4_2V;
break;
default:
/*
* AXP20x max voltage can be set to 4.36V and AXP22X max voltage
* can be set to 4.22V and 4.24V, but these voltages are too
* high for Lithium based batteries (AXP PMICs are supposed to
* be used with these kinds of battery).
*/
return -EINVAL;
}
return regmap_update_bits(axp20x_batt->regmap, AXP20X_CHRG_CTRL1,
AXP20X_CHRG_CTRL1_TGT_VOLT, val);
}
static int axp20x_set_constant_charge_current(struct axp20x_batt_ps *axp_batt,
int charge_current)
{
if (charge_current > axp_batt->max_ccc)
return -EINVAL;
charge_current = (charge_current - axp_batt->data->ccc_offset) /
axp_batt->data->ccc_scale;
if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
return -EINVAL;
return regmap_update_bits(axp_batt->regmap, AXP20X_CHRG_CTRL1,
AXP20X_CHRG_CTRL1_TGT_CURR, charge_current);
}
static int axp20x_set_max_constant_charge_current(struct axp20x_batt_ps *axp,
int charge_current)
{
bool lower_max = false;
charge_current = (charge_current - axp->data->ccc_offset) /
axp->data->ccc_scale;
if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
return -EINVAL;
charge_current = charge_current * axp->data->ccc_scale +
axp->data->ccc_offset;
if (charge_current > axp->max_ccc)
dev_warn(axp->dev,
"Setting max constant charge current higher than previously defined. Note that increasing the constant charge current may damage your battery.\n");
else
lower_max = true;
axp->max_ccc = charge_current;
if (lower_max) {
int current_cc;
axp20x_get_constant_charge_current(axp, ¤t_cc);
if (current_cc > charge_current)
axp20x_set_constant_charge_current(axp, charge_current);
}
return 0;
}
static int axp20x_set_voltage_min_design(struct axp20x_batt_ps *axp_batt,
int min_voltage)
{
int val1 = (min_voltage - 2600000) / 100000;
if (val1 < 0 || val1 > AXP20X_V_OFF_MASK)
return -EINVAL;
return regmap_update_bits(axp_batt->regmap, AXP20X_V_OFF,
AXP20X_V_OFF_MASK, val1);
}
static int axp20x_battery_set_prop(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct axp20x_batt_ps *axp20x_batt = power_supply_get_drvdata(psy);
switch (psp) {
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
return axp20x_set_voltage_min_design(axp20x_batt, val->intval);
case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
return axp20x_batt->data->set_max_voltage(axp20x_batt, val->intval);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
return axp20x_set_constant_charge_current(axp20x_batt,
val->intval);
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
return axp20x_set_max_constant_charge_current(axp20x_batt,
val->intval);
default:
return -EINVAL;
}
}
static enum power_supply_property axp20x_battery_props[] = {
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
POWER_SUPPLY_PROP_CAPACITY,
};
static int axp20x_battery_prop_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
return psp == POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN ||
psp == POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN ||
psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT ||
psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX;
}
static const struct power_supply_desc axp20x_batt_ps_desc = {
.name = "axp20x-battery",
.type = POWER_SUPPLY_TYPE_BATTERY,
.properties = axp20x_battery_props,
.num_properties = ARRAY_SIZE(axp20x_battery_props),
.property_is_writeable = axp20x_battery_prop_writeable,
.get_property = axp20x_battery_get_prop,
.set_property = axp20x_battery_set_prop,
};
static const struct axp_data axp209_data = {
.ccc_scale = 100000,
.ccc_offset = 300000,
.get_max_voltage = axp20x_battery_get_max_voltage,
.set_max_voltage = axp20x_battery_set_max_voltage,
};
static const struct axp_data axp221_data = {
.ccc_scale = 150000,
.ccc_offset = 300000,
.has_fg_valid = true,
.get_max_voltage = axp22x_battery_get_max_voltage,
.set_max_voltage = axp22x_battery_set_max_voltage,
};
static const struct axp_data axp813_data = {
.ccc_scale = 200000,
.ccc_offset = 200000,
.has_fg_valid = true,
.get_max_voltage = axp813_battery_get_max_voltage,
.set_max_voltage = axp20x_battery_set_max_voltage,
};
static const struct of_device_id axp20x_battery_ps_id[] = {
{
.compatible = "x-powers,axp209-battery-power-supply",
.data = (void *)&axp209_data,
}, {
.compatible = "x-powers,axp221-battery-power-supply",
.data = (void *)&axp221_data,
}, {
.compatible = "x-powers,axp813-battery-power-supply",
.data = (void *)&axp813_data,
}, { /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, axp20x_battery_ps_id);
static int axp20x_power_probe(struct platform_device *pdev)
{
struct axp20x_batt_ps *axp20x_batt;
struct power_supply_config psy_cfg = {};
struct power_supply_battery_info info;
struct device *dev = &pdev->dev;
if (!of_device_is_available(pdev->dev.of_node))
return -ENODEV;
axp20x_batt = devm_kzalloc(&pdev->dev, sizeof(*axp20x_batt),
GFP_KERNEL);
if (!axp20x_batt)
return -ENOMEM;
axp20x_batt->dev = &pdev->dev;
axp20x_batt->batt_v = devm_iio_channel_get(&pdev->dev, "batt_v");
if (IS_ERR(axp20x_batt->batt_v)) {
if (PTR_ERR(axp20x_batt->batt_v) == -ENODEV)
return -EPROBE_DEFER;
return PTR_ERR(axp20x_batt->batt_v);
}
axp20x_batt->batt_chrg_i = devm_iio_channel_get(&pdev->dev,
"batt_chrg_i");
if (IS_ERR(axp20x_batt->batt_chrg_i)) {
if (PTR_ERR(axp20x_batt->batt_chrg_i) == -ENODEV)
return -EPROBE_DEFER;
return PTR_ERR(axp20x_batt->batt_chrg_i);
}
axp20x_batt->batt_dischrg_i = devm_iio_channel_get(&pdev->dev,
"batt_dischrg_i");
if (IS_ERR(axp20x_batt->batt_dischrg_i)) {
if (PTR_ERR(axp20x_batt->batt_dischrg_i) == -ENODEV)
return -EPROBE_DEFER;
return PTR_ERR(axp20x_batt->batt_dischrg_i);
}
axp20x_batt->regmap = dev_get_regmap(pdev->dev.parent, NULL);
platform_set_drvdata(pdev, axp20x_batt);
psy_cfg.drv_data = axp20x_batt;
psy_cfg.of_node = pdev->dev.of_node;
axp20x_batt->data = (struct axp_data *)of_device_get_match_data(dev);
axp20x_batt->batt = devm_power_supply_register(&pdev->dev,
&axp20x_batt_ps_desc,
&psy_cfg);
if (IS_ERR(axp20x_batt->batt)) {
dev_err(&pdev->dev, "failed to register power supply: %ld\n",
PTR_ERR(axp20x_batt->batt));
return PTR_ERR(axp20x_batt->batt);
}
if (!power_supply_get_battery_info(axp20x_batt->batt, &info)) {
int vmin = info.voltage_min_design_uv;
int ccc = info.constant_charge_current_max_ua;
if (vmin > 0 && axp20x_set_voltage_min_design(axp20x_batt,
vmin))
dev_err(&pdev->dev,
"couldn't set voltage_min_design\n");
/* Set max to unverified value to be able to set CCC */
axp20x_batt->max_ccc = ccc;
if (ccc <= 0 || axp20x_set_constant_charge_current(axp20x_batt,
ccc)) {
dev_err(&pdev->dev,
"couldn't set constant charge current from DT: fallback to minimum value\n");
ccc = 300000;
axp20x_batt->max_ccc = ccc;
axp20x_set_constant_charge_current(axp20x_batt, ccc);
}
}
/*
* Update max CCC to a valid value if battery info is present or set it
* to current register value by default.
*/
axp20x_get_constant_charge_current(axp20x_batt,
&axp20x_batt->max_ccc);
return 0;
}
static struct platform_driver axp20x_batt_driver = {
.probe = axp20x_power_probe,
.driver = {
.name = "axp20x-battery-power-supply",
.of_match_table = axp20x_battery_ps_id,
},
};
module_platform_driver(axp20x_batt_driver);
MODULE_DESCRIPTION("Battery power supply driver for AXP20X and AXP22X PMICs");
MODULE_AUTHOR("Quentin Schulz <quentin.schulz@free-electrons.com>");
MODULE_LICENSE("GPL");