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-rw-r--r--drivers/power/supply/axp288_fuel_gauge.c809
1 files changed, 809 insertions, 0 deletions
diff --git a/drivers/power/supply/axp288_fuel_gauge.c b/drivers/power/supply/axp288_fuel_gauge.c
new file mode 100644
index 000000000..3be6f3b10
--- /dev/null
+++ b/drivers/power/supply/axp288_fuel_gauge.c
@@ -0,0 +1,809 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver
+ *
+ * Copyright (C) 2020-2021 Andrejus Basovas <xxx@yyy.tld>
+ * Copyright (C) 2016-2021 Hans de Goede <hdegoede@redhat.com>
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/acpi.h>
+#include <linux/dmi.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/axp20x.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/iio/consumer.h>
+#include <asm/unaligned.h>
+#include <asm/iosf_mbi.h>
+
+#define PS_STAT_VBUS_TRIGGER (1 << 0)
+#define PS_STAT_BAT_CHRG_DIR (1 << 2)
+#define PS_STAT_VBAT_ABOVE_VHOLD (1 << 3)
+#define PS_STAT_VBUS_VALID (1 << 4)
+#define PS_STAT_VBUS_PRESENT (1 << 5)
+
+#define CHRG_STAT_BAT_SAFE_MODE (1 << 3)
+#define CHRG_STAT_BAT_VALID (1 << 4)
+#define CHRG_STAT_BAT_PRESENT (1 << 5)
+#define CHRG_STAT_CHARGING (1 << 6)
+#define CHRG_STAT_PMIC_OTP (1 << 7)
+
+#define CHRG_CCCV_CC_MASK 0xf /* 4 bits */
+#define CHRG_CCCV_CC_BIT_POS 0
+#define CHRG_CCCV_CC_OFFSET 200 /* 200mA */
+#define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */
+#define CHRG_CCCV_ITERM_20P (1 << 4) /* 20% of CC */
+#define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */
+#define CHRG_CCCV_CV_BIT_POS 5
+#define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */
+#define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */
+#define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */
+#define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */
+#define CHRG_CCCV_CHG_EN (1 << 7)
+
+#define FG_CNTL_OCV_ADJ_STAT (1 << 2)
+#define FG_CNTL_OCV_ADJ_EN (1 << 3)
+#define FG_CNTL_CAP_ADJ_STAT (1 << 4)
+#define FG_CNTL_CAP_ADJ_EN (1 << 5)
+#define FG_CNTL_CC_EN (1 << 6)
+#define FG_CNTL_GAUGE_EN (1 << 7)
+
+#define FG_15BIT_WORD_VALID (1 << 15)
+#define FG_15BIT_VAL_MASK 0x7fff
+
+#define FG_REP_CAP_VALID (1 << 7)
+#define FG_REP_CAP_VAL_MASK 0x7F
+
+#define FG_DES_CAP1_VALID (1 << 7)
+#define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */
+
+#define FG_DES_CC_RES_LSB 1456 /* 1.456mAhr */
+
+#define FG_OCV_CAP_VALID (1 << 7)
+#define FG_OCV_CAP_VAL_MASK 0x7F
+#define FG_CC_CAP_VALID (1 << 7)
+#define FG_CC_CAP_VAL_MASK 0x7F
+
+#define FG_LOW_CAP_THR1_MASK 0xf0 /* 5% tp 20% */
+#define FG_LOW_CAP_THR1_VAL 0xa0 /* 15 perc */
+#define FG_LOW_CAP_THR2_MASK 0x0f /* 0% to 15% */
+#define FG_LOW_CAP_WARN_THR 14 /* 14 perc */
+#define FG_LOW_CAP_CRIT_THR 4 /* 4 perc */
+#define FG_LOW_CAP_SHDN_THR 0 /* 0 perc */
+
+#define DEV_NAME "axp288_fuel_gauge"
+
+/* 1.1mV per LSB expressed in uV */
+#define VOLTAGE_FROM_ADC(a) ((a * 11) / 10)
+/* properties converted to uV, uA */
+#define PROP_VOLT(a) ((a) * 1000)
+#define PROP_CURR(a) ((a) * 1000)
+
+#define AXP288_REG_UPDATE_INTERVAL (60 * HZ)
+#define AXP288_FG_INTR_NUM 6
+
+#define AXP288_QUIRK_NO_BATTERY BIT(0)
+
+static bool no_current_sense_res;
+module_param(no_current_sense_res, bool, 0444);
+MODULE_PARM_DESC(no_current_sense_res, "No (or broken) current sense resistor");
+
+enum {
+ QWBTU_IRQ = 0,
+ WBTU_IRQ,
+ QWBTO_IRQ,
+ WBTO_IRQ,
+ WL2_IRQ,
+ WL1_IRQ,
+};
+
+enum {
+ BAT_CHRG_CURR,
+ BAT_D_CURR,
+ BAT_VOLT,
+ IIO_CHANNEL_NUM
+};
+
+struct axp288_fg_info {
+ struct device *dev;
+ struct regmap *regmap;
+ int irq[AXP288_FG_INTR_NUM];
+ struct iio_channel *iio_channel[IIO_CHANNEL_NUM];
+ struct power_supply *bat;
+ struct mutex lock;
+ int status;
+ int max_volt;
+ int pwr_op;
+ int low_cap;
+ struct dentry *debug_file;
+
+ char valid; /* zero until following fields are valid */
+ unsigned long last_updated; /* in jiffies */
+
+ int pwr_stat;
+ int fg_res;
+ int bat_volt;
+ int d_curr;
+ int c_curr;
+ int ocv;
+ int fg_cc_mtr1;
+ int fg_des_cap1;
+};
+
+static enum power_supply_property fuel_gauge_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_OCV,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ /* The 3 props below are not used when no_current_sense_res is set */
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+};
+
+static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
+{
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(info->regmap, reg, &val);
+ if (ret < 0) {
+ dev_err(info->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
+ return ret;
+ }
+
+ return val;
+}
+
+static int fuel_gauge_reg_writeb(struct axp288_fg_info *info, int reg, u8 val)
+{
+ int ret;
+
+ ret = regmap_write(info->regmap, reg, (unsigned int)val);
+
+ if (ret < 0)
+ dev_err(info->dev, "Error writing reg 0x%02x err: %d\n", reg, ret);
+
+ return ret;
+}
+
+static int fuel_gauge_read_15bit_word(struct axp288_fg_info *info, int reg)
+{
+ unsigned char buf[2];
+ int ret;
+
+ ret = regmap_bulk_read(info->regmap, reg, buf, 2);
+ if (ret < 0) {
+ dev_err(info->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
+ return ret;
+ }
+
+ ret = get_unaligned_be16(buf);
+ if (!(ret & FG_15BIT_WORD_VALID)) {
+ dev_err(info->dev, "Error reg 0x%02x contents not valid\n", reg);
+ return -ENXIO;
+ }
+
+ return ret & FG_15BIT_VAL_MASK;
+}
+
+static int fuel_gauge_read_12bit_word(struct axp288_fg_info *info, int reg)
+{
+ unsigned char buf[2];
+ int ret;
+
+ ret = regmap_bulk_read(info->regmap, reg, buf, 2);
+ if (ret < 0) {
+ dev_err(info->dev, "Error reading reg 0x%02x err: %d\n", reg, ret);
+ return ret;
+ }
+
+ /* 12-bit data values have upper 8 bits in buf[0], lower 4 in buf[1] */
+ return (buf[0] << 4) | ((buf[1] >> 4) & 0x0f);
+}
+
+static int fuel_gauge_update_registers(struct axp288_fg_info *info)
+{
+ int ret;
+
+ if (info->valid && time_before(jiffies, info->last_updated + AXP288_REG_UPDATE_INTERVAL))
+ return 0;
+
+ dev_dbg(info->dev, "Fuel Gauge updating register values...\n");
+
+ ret = iosf_mbi_block_punit_i2c_access();
+ if (ret < 0)
+ return ret;
+
+ ret = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
+ if (ret < 0)
+ goto out;
+ info->pwr_stat = ret;
+
+ if (no_current_sense_res)
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG);
+ else
+ ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
+ if (ret < 0)
+ goto out;
+ info->fg_res = ret;
+
+ ret = iio_read_channel_raw(info->iio_channel[BAT_VOLT], &info->bat_volt);
+ if (ret < 0)
+ goto out;
+
+ ret = fuel_gauge_read_12bit_word(info, AXP288_FG_OCVH_REG);
+ if (ret < 0)
+ goto out;
+ info->ocv = ret;
+
+ if (no_current_sense_res)
+ goto out_no_current_sense_res;
+
+ if (info->pwr_stat & PS_STAT_BAT_CHRG_DIR) {
+ info->d_curr = 0;
+ ret = iio_read_channel_raw(info->iio_channel[BAT_CHRG_CURR], &info->c_curr);
+ if (ret < 0)
+ goto out;
+ } else {
+ info->c_curr = 0;
+ ret = iio_read_channel_raw(info->iio_channel[BAT_D_CURR], &info->d_curr);
+ if (ret < 0)
+ goto out;
+ }
+
+ ret = fuel_gauge_read_15bit_word(info, AXP288_FG_CC_MTR1_REG);
+ if (ret < 0)
+ goto out;
+ info->fg_cc_mtr1 = ret;
+
+ ret = fuel_gauge_read_15bit_word(info, AXP288_FG_DES_CAP1_REG);
+ if (ret < 0)
+ goto out;
+ info->fg_des_cap1 = ret;
+
+out_no_current_sense_res:
+ info->last_updated = jiffies;
+ info->valid = 1;
+ ret = 0;
+out:
+ iosf_mbi_unblock_punit_i2c_access();
+ return ret;
+}
+
+static void fuel_gauge_get_status(struct axp288_fg_info *info)
+{
+ int pwr_stat = info->pwr_stat;
+ int fg_res = info->fg_res;
+ int curr = info->d_curr;
+
+ /* Report full if Vbus is valid and the reported capacity is 100% */
+ if (!(pwr_stat & PS_STAT_VBUS_VALID))
+ goto not_full;
+
+ if (!(fg_res & FG_REP_CAP_VALID))
+ goto not_full;
+
+ fg_res &= ~FG_REP_CAP_VALID;
+ if (fg_res == 100) {
+ info->status = POWER_SUPPLY_STATUS_FULL;
+ return;
+ }
+
+ /*
+ * Sometimes the charger turns itself off before fg-res reaches 100%.
+ * When this happens the AXP288 reports a not-charging status and
+ * 0 mA discharge current.
+ */
+ if (fg_res < 90 || (pwr_stat & PS_STAT_BAT_CHRG_DIR) || no_current_sense_res)
+ goto not_full;
+
+ if (curr == 0) {
+ info->status = POWER_SUPPLY_STATUS_FULL;
+ return;
+ }
+
+not_full:
+ if (pwr_stat & PS_STAT_BAT_CHRG_DIR)
+ info->status = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ info->status = POWER_SUPPLY_STATUS_DISCHARGING;
+}
+
+static int fuel_gauge_battery_health(struct axp288_fg_info *info)
+{
+ int vocv = VOLTAGE_FROM_ADC(info->ocv);
+ int health = POWER_SUPPLY_HEALTH_UNKNOWN;
+
+ if (vocv > info->max_volt)
+ health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ else
+ health = POWER_SUPPLY_HEALTH_GOOD;
+
+ return health;
+}
+
+static int fuel_gauge_get_property(struct power_supply *ps,
+ enum power_supply_property prop,
+ union power_supply_propval *val)
+{
+ struct axp288_fg_info *info = power_supply_get_drvdata(ps);
+ int ret, value;
+
+ mutex_lock(&info->lock);
+
+ ret = fuel_gauge_update_registers(info);
+ if (ret < 0)
+ goto out;
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_STATUS:
+ fuel_gauge_get_status(info);
+ val->intval = info->status;
+ break;
+ case POWER_SUPPLY_PROP_HEALTH:
+ val->intval = fuel_gauge_battery_health(info);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ value = VOLTAGE_FROM_ADC(info->bat_volt);
+ val->intval = PROP_VOLT(value);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+ value = VOLTAGE_FROM_ADC(info->ocv);
+ val->intval = PROP_VOLT(value);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ if (info->d_curr > 0)
+ value = -1 * info->d_curr;
+ else
+ value = info->c_curr;
+
+ val->intval = PROP_CURR(value);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ if (info->pwr_op & CHRG_STAT_BAT_PRESENT)
+ val->intval = 1;
+ else
+ val->intval = 0;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ if (!(info->fg_res & FG_REP_CAP_VALID))
+ dev_err(info->dev, "capacity measurement not valid\n");
+ val->intval = (info->fg_res & FG_REP_CAP_VAL_MASK);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
+ val->intval = (info->low_cap & 0x0f);
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ val->intval = info->fg_cc_mtr1 * FG_DES_CAP_RES_LSB;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ val->intval = info->fg_des_cap1 * FG_DES_CAP_RES_LSB;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ val->intval = PROP_VOLT(info->max_volt);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+out:
+ mutex_unlock(&info->lock);
+ return ret;
+}
+
+static int fuel_gauge_set_property(struct power_supply *ps,
+ enum power_supply_property prop,
+ const union power_supply_propval *val)
+{
+ struct axp288_fg_info *info = power_supply_get_drvdata(ps);
+ int new_low_cap, ret = 0;
+
+ mutex_lock(&info->lock);
+ switch (prop) {
+ case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
+ if ((val->intval < 0) || (val->intval > 15)) {
+ ret = -EINVAL;
+ break;
+ }
+ new_low_cap = info->low_cap;
+ new_low_cap &= 0xf0;
+ new_low_cap |= (val->intval & 0xf);
+ ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, new_low_cap);
+ if (ret == 0)
+ info->low_cap = new_low_cap;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ mutex_unlock(&info->lock);
+ return ret;
+}
+
+static int fuel_gauge_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ int ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
+ ret = 1;
+ break;
+ default:
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static irqreturn_t fuel_gauge_thread_handler(int irq, void *dev)
+{
+ struct axp288_fg_info *info = dev;
+ int i;
+
+ for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
+ if (info->irq[i] == irq)
+ break;
+ }
+
+ if (i >= AXP288_FG_INTR_NUM) {
+ dev_warn(info->dev, "spurious interrupt!!\n");
+ return IRQ_NONE;
+ }
+
+ switch (i) {
+ case QWBTU_IRQ:
+ dev_info(info->dev, "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
+ break;
+ case WBTU_IRQ:
+ dev_info(info->dev, "Battery under temperature in work mode IRQ (WBTU)\n");
+ break;
+ case QWBTO_IRQ:
+ dev_info(info->dev, "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
+ break;
+ case WBTO_IRQ:
+ dev_info(info->dev, "Battery over temperature in work mode IRQ (WBTO)\n");
+ break;
+ case WL2_IRQ:
+ dev_info(info->dev, "Low Batt Warning(2) INTR\n");
+ break;
+ case WL1_IRQ:
+ dev_info(info->dev, "Low Batt Warning(1) INTR\n");
+ break;
+ default:
+ dev_warn(info->dev, "Spurious Interrupt!!!\n");
+ }
+
+ mutex_lock(&info->lock);
+ info->valid = 0; /* Force updating of the cached registers */
+ mutex_unlock(&info->lock);
+
+ power_supply_changed(info->bat);
+ return IRQ_HANDLED;
+}
+
+static void fuel_gauge_external_power_changed(struct power_supply *psy)
+{
+ struct axp288_fg_info *info = power_supply_get_drvdata(psy);
+
+ mutex_lock(&info->lock);
+ info->valid = 0; /* Force updating of the cached registers */
+ mutex_unlock(&info->lock);
+ power_supply_changed(psy);
+}
+
+static struct power_supply_desc fuel_gauge_desc = {
+ .name = DEV_NAME,
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = fuel_gauge_props,
+ .num_properties = ARRAY_SIZE(fuel_gauge_props),
+ .get_property = fuel_gauge_get_property,
+ .set_property = fuel_gauge_set_property,
+ .property_is_writeable = fuel_gauge_property_is_writeable,
+ .external_power_changed = fuel_gauge_external_power_changed,
+};
+
+/*
+ * Some devices have no battery (HDMI sticks) and the axp288 battery's
+ * detection reports one despite it not being there.
+ * Please keep this listed sorted alphabetically.
+ */
+static const struct dmi_system_id axp288_quirks[] = {
+ {
+ /* ACEPC T8 Cherry Trail Z8350 mini PC */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T8"),
+ /* also match on somewhat unique bios-version */
+ DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
+ },
+ .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
+ },
+ {
+ /* ACEPC T11 Cherry Trail Z8350 mini PC */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "To be filled by O.E.M."),
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, "Cherry Trail CR"),
+ DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "T11"),
+ /* also match on somewhat unique bios-version */
+ DMI_EXACT_MATCH(DMI_BIOS_VERSION, "1.000"),
+ },
+ .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
+ },
+ {
+ /* Intel Cherry Trail Compute Stick, Windows version */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "STK1AW32SC"),
+ },
+ .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
+ },
+ {
+ /* Intel Cherry Trail Compute Stick, version without an OS */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "STK1A32SC"),
+ },
+ .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
+ },
+ {
+ /* Meegopad T02 */
+ .matches = {
+ DMI_MATCH(DMI_PRODUCT_NAME, "MEEGOPAD T02"),
+ },
+ .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
+ },
+ { /* Mele PCG03 Mini PC */
+ .matches = {
+ DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Mini PC"),
+ DMI_EXACT_MATCH(DMI_BOARD_NAME, "Mini PC"),
+ },
+ .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
+ },
+ {
+ /* Minix Neo Z83-4 mini PC */
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "MINIX"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Z83-4"),
+ },
+ .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
+ },
+ {
+ /*
+ * One Mix 1, this uses the "T3 MRD" boardname used by
+ * generic mini PCs, but it is a mini laptop so it does
+ * actually have a battery!
+ */
+ .matches = {
+ DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
+ DMI_MATCH(DMI_BIOS_DATE, "06/14/2018"),
+ },
+ .driver_data = NULL,
+ },
+ {
+ /*
+ * Various Ace PC/Meegopad/MinisForum/Wintel Mini-PCs/HDMI-sticks
+ * This entry must be last because it is generic, this allows
+ * adding more specifuc quirks overriding this generic entry.
+ */
+ .matches = {
+ DMI_MATCH(DMI_BOARD_NAME, "T3 MRD"),
+ DMI_MATCH(DMI_CHASSIS_TYPE, "3"),
+ DMI_MATCH(DMI_BIOS_VENDOR, "American Megatrends Inc."),
+ },
+ .driver_data = (void *)AXP288_QUIRK_NO_BATTERY,
+ },
+ {}
+};
+
+static int axp288_fuel_gauge_read_initial_regs(struct axp288_fg_info *info)
+{
+ unsigned int val;
+ int ret;
+
+ /*
+ * On some devices the fuelgauge and charger parts of the axp288 are
+ * not used, check that the fuelgauge is enabled (CC_CTRL != 0).
+ */
+ ret = regmap_read(info->regmap, AXP20X_CC_CTRL, &val);
+ if (ret < 0)
+ return ret;
+ if (val == 0)
+ return -ENODEV;
+
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
+ if (ret < 0)
+ return ret;
+
+ if (!(ret & FG_DES_CAP1_VALID)) {
+ dev_err(info->dev, "axp288 not configured by firmware\n");
+ return -ENODEV;
+ }
+
+ ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
+ if (ret < 0)
+ return ret;
+ switch ((ret & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS) {
+ case CHRG_CCCV_CV_4100MV:
+ info->max_volt = 4100;
+ break;
+ case CHRG_CCCV_CV_4150MV:
+ info->max_volt = 4150;
+ break;
+ case CHRG_CCCV_CV_4200MV:
+ info->max_volt = 4200;
+ break;
+ case CHRG_CCCV_CV_4350MV:
+ info->max_volt = 4350;
+ break;
+ }
+
+ ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
+ if (ret < 0)
+ return ret;
+ info->pwr_op = ret;
+
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
+ if (ret < 0)
+ return ret;
+ info->low_cap = ret;
+
+ return 0;
+}
+
+static void axp288_fuel_gauge_release_iio_chans(void *data)
+{
+ struct axp288_fg_info *info = data;
+ int i;
+
+ for (i = 0; i < IIO_CHANNEL_NUM; i++)
+ if (!IS_ERR_OR_NULL(info->iio_channel[i]))
+ iio_channel_release(info->iio_channel[i]);
+}
+
+static int axp288_fuel_gauge_probe(struct platform_device *pdev)
+{
+ struct axp288_fg_info *info;
+ struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
+ struct power_supply_config psy_cfg = {};
+ static const char * const iio_chan_name[] = {
+ [BAT_CHRG_CURR] = "axp288-chrg-curr",
+ [BAT_D_CURR] = "axp288-chrg-d-curr",
+ [BAT_VOLT] = "axp288-batt-volt",
+ };
+ const struct dmi_system_id *dmi_id;
+ struct device *dev = &pdev->dev;
+ unsigned long quirks = 0;
+ int i, pirq, ret;
+
+ /*
+ * Normally the native AXP288 fg/charger drivers are preferred but
+ * on some devices the ACPI drivers should be used instead.
+ */
+ if (!acpi_quirk_skip_acpi_ac_and_battery())
+ return -ENODEV;
+
+ dmi_id = dmi_first_match(axp288_quirks);
+ if (dmi_id)
+ quirks = (unsigned long)dmi_id->driver_data;
+
+ if (quirks & AXP288_QUIRK_NO_BATTERY)
+ return -ENODEV;
+
+ info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->dev = dev;
+ info->regmap = axp20x->regmap;
+ info->status = POWER_SUPPLY_STATUS_UNKNOWN;
+ info->valid = 0;
+
+ platform_set_drvdata(pdev, info);
+
+ mutex_init(&info->lock);
+
+ for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
+ pirq = platform_get_irq(pdev, i);
+ if (pirq < 0)
+ continue;
+ ret = regmap_irq_get_virq(axp20x->regmap_irqc, pirq);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "getting vIRQ %d\n", pirq);
+
+ info->irq[i] = ret;
+ }
+
+ for (i = 0; i < IIO_CHANNEL_NUM; i++) {
+ /*
+ * Note cannot use devm_iio_channel_get because x86 systems
+ * lack the device<->channel maps which iio_channel_get will
+ * try to use when passed a non NULL device pointer.
+ */
+ info->iio_channel[i] =
+ iio_channel_get(NULL, iio_chan_name[i]);
+ if (IS_ERR(info->iio_channel[i])) {
+ ret = PTR_ERR(info->iio_channel[i]);
+ dev_dbg(dev, "error getting iiochan %s: %d\n", iio_chan_name[i], ret);
+ /* Wait for axp288_adc to load */
+ if (ret == -ENODEV)
+ ret = -EPROBE_DEFER;
+
+ axp288_fuel_gauge_release_iio_chans(info);
+ return ret;
+ }
+ }
+
+ ret = devm_add_action_or_reset(dev, axp288_fuel_gauge_release_iio_chans, info);
+ if (ret)
+ return ret;
+
+ ret = iosf_mbi_block_punit_i2c_access();
+ if (ret < 0)
+ return ret;
+
+ ret = axp288_fuel_gauge_read_initial_regs(info);
+ iosf_mbi_unblock_punit_i2c_access();
+ if (ret < 0)
+ return ret;
+
+ psy_cfg.drv_data = info;
+ if (no_current_sense_res)
+ fuel_gauge_desc.num_properties = ARRAY_SIZE(fuel_gauge_props) - 3;
+ info->bat = devm_power_supply_register(dev, &fuel_gauge_desc, &psy_cfg);
+ if (IS_ERR(info->bat)) {
+ ret = PTR_ERR(info->bat);
+ dev_err(dev, "failed to register battery: %d\n", ret);
+ return ret;
+ }
+
+ for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
+ ret = devm_request_threaded_irq(dev, info->irq[i], NULL,
+ fuel_gauge_thread_handler,
+ IRQF_ONESHOT, DEV_NAME, info);
+ if (ret)
+ return dev_err_probe(dev, ret, "requesting IRQ %d\n", info->irq[i]);
+ }
+
+ return 0;
+}
+
+static const struct platform_device_id axp288_fg_id_table[] = {
+ { .name = DEV_NAME },
+ {},
+};
+MODULE_DEVICE_TABLE(platform, axp288_fg_id_table);
+
+static struct platform_driver axp288_fuel_gauge_driver = {
+ .probe = axp288_fuel_gauge_probe,
+ .id_table = axp288_fg_id_table,
+ .driver = {
+ .name = DEV_NAME,
+ },
+};
+
+module_platform_driver(axp288_fuel_gauge_driver);
+
+MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
+MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
+MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
+MODULE_LICENSE("GPL");