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alistair23-linux/drivers/power/supply/axp20x_battery.c
Quentin Schulz c800384490 power: supply: axp20x_battery: add DT support for battery max constant charge current 
This adds the ability to set the maximum constant charge current,
supported by the battery, delivered by this battery power supply to the
battery.

The maximum constant charge current set in DT will also set the default
constant charge current supplied by this supply.

The actual user can modify the constant charge current within the range
of 0 to maximum constant charge current via sysfs.
The user can also modify the maximum constant charge current to widen
the range of possible constant charge current. While this seems quite
risky, a message is printed on the console to warn the user this might
damage the battery. The reason for letting the user change the maximum
constant charge current is for letting users change the battery and
thus, let them adjust the maximum constant charge current according to
what the battery can support.

Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
2017-06-08 17:57:53 +02:00

575 lines
15 KiB
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/*
* 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 AXP20X_CHRG_CTRL1_TGT_CURR GENMASK(3, 0)
#define AXP20X_V_OFF_MASK GENMASK(2, 0)
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;
u8 axp_id;
};
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, &reg);
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, &reg);
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 void raw_to_constant_charge_current(struct axp20x_batt_ps *axp, int *val)
{
if (axp->axp_id == AXP209_ID)
*val = *val * 100000 + 300000;
else
*val = *val * 150000 + 300000;
}
static void constant_charge_current_to_raw(struct axp20x_batt_ps *axp, int *val)
{
if (axp->axp_id == AXP209_ID)
*val = (*val - 300000) / 100000;
else
*val = (*val - 300000) / 150000;
}
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;
raw_to_constant_charge_current(axp, val);
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,
&reg);
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,
&reg);
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,
&reg);
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,
&reg);
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, &reg);
if (ret)
return ret;
if (axp20x_batt->axp_id == AXP221_ID &&
!(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:
if (axp20x_batt->axp_id == AXP209_ID)
return axp20x_battery_get_max_voltage(axp20x_batt,
&val->intval);
return axp22x_battery_get_max_voltage(axp20x_batt,
&val->intval);
case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
ret = regmap_read(axp20x_batt->regmap, AXP20X_V_OFF, &reg);
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 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:
if (axp20x_batt->axp_id == AXP221_ID)
return -EINVAL;
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;
constant_charge_current_to_raw(axp_batt, &charge_current);
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;
constant_charge_current_to_raw(axp, &charge_current);
if (charge_current > AXP20X_CHRG_CTRL1_TGT_CURR || charge_current < 0)
return -EINVAL;
raw_to_constant_charge_current(axp, &charge_current);
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, &current_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_battery_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 of_device_id axp20x_battery_ps_id[] = {
{
.compatible = "x-powers,axp209-battery-power-supply",
.data = (void *)AXP209_ID,
}, {
.compatible = "x-powers,axp221-battery-power-supply",
.data = (void *)AXP221_ID,
}, { /* 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;
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->axp_id = (uintptr_t)of_device_get_match_data(&pdev->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");
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