--- /dev/null
+/*
+ * 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;
+ 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, ®);
+ 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 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 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,
+ ®);
+ 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_CHRG_CTRL1_TGT_CURR;
+ raw_to_constant_charge_current(axp20x_batt, &val->intval);
+
+ 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->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, ®);
+ 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 (axp_batt->axp_id == AXP209_ID)
+ charge_current = (charge_current - 300000) / 100000;
+ else
+ charge_current = (charge_current - 300000) / 150000;
+
+ 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_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);
+
+ 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;
+}
+
+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 = {};
+
+ 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);
+ }
+
+ 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");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff