@@ -192,6 +192,15 @@ config BATTERY_DA9052
Say Y here to enable support for batteries charger integrated into
DA9052 PMIC.
+config AXP288_FUEL_GAUGE
+ tristate "X-Powers AXP288 Fuel Gauge"
+ depends on MFD_AXP20X && IIO
+ help
+ Say yes here to have support for X-Power power management IC (PMIC)
+ Fuel Gauge. The device provides battery statistics and status
+ monitoring as well as alerts for battery over/under voltage and
+ over/under temperature.
+
config BATTERY_MAX17040
tristate "Maxim MAX17040 Fuel Gauge"
depends on I2C
@@ -59,3 +59,4 @@ obj-$(CONFIG_POWER_AVS) += avs/
obj-$(CONFIG_CHARGER_SMB347) += smb347-charger.o
obj-$(CONFIG_CHARGER_TPS65090) += tps65090-charger.o
obj-$(CONFIG_POWER_RESET) += reset/
+obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o
new file mode 100644
@@ -0,0 +1,1151 @@
+/*
+ * axp288_fuel_gauge.c - Xpower AXP288 PMIC Fuel Gauge Driver
+ *
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+#include <linux/jiffies.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/axp20x.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/iio/consumer.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#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 CV_4100 4100 /* 4100mV */
+#define CV_4150 4150 /* 4150mV */
+#define CV_4200 4200 /* 4200mV */
+#define CV_4350 4350 /* 4350mV */
+
+#define TEMP_IRQ_CFG_QWBTU (1 << 0)
+#define TEMP_IRQ_CFG_WBTU (1 << 1)
+#define TEMP_IRQ_CFG_QWBTO (1 << 2)
+#define TEMP_IRQ_CFG_WBTO (1 << 3)
+#define TEMP_IRQ_CFG_MASK 0xf
+
+#define FG_IRQ_CFG_LOWBATT_WL2 (1 << 0)
+#define FG_IRQ_CFG_LOWBATT_WL1 (1 << 1)
+#define FG_IRQ_CFG_LOWBATT_MASK 0x3
+#define LOWBAT_IRQ_STAT_LOWBATT_WL2 (1 << 0)
+#define LOWBAT_IRQ_STAT_LOWBATT_WL1 (1 << 1)
+
+#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_REP_CAP_VALID (1 << 7)
+#define FG_REP_CAP_VAL_MASK 0x7F
+
+#define FG_DES_CAP1_VALID (1 << 7)
+#define FG_DES_CAP1_VAL_MASK 0x7F
+#define FG_DES_CAP0_VAL_MASK 0xFF
+#define FG_DES_CAP_RES_LSB 1456 /* 1.456mAhr */
+
+#define FG_CC_MTR1_VALID (1 << 7)
+#define FG_CC_MTR1_VAL_MASK 0x7F
+#define FG_CC_MTR0_VAL_MASK 0xFF
+#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 STATUS_MON_DELAY_JIFFIES (HZ * 60) /*60 sec */
+#define NR_RETRY_CNT 3
+#define DEV_NAME "axp288_fuel_gauge"
+
+/* 1.1mV per LSB expressed in uV */
+#define VOLTAGE_FROM_ADC(a) ((a * 11) / 10)
+/* properties converted to tenths of degrees, uV, uA, uW */
+#define PROP_TEMP(a) ((a) * 10)
+#define UNPROP_TEMP(a) ((a) / 10)
+#define PROP_VOLT(a) ((a) * 1000)
+#define PROP_CURR(a) ((a) * 1000)
+
+#define AXP288_FG_INTR_NUM 6
+enum {
+ QWBTU_IRQ = 0,
+ WBTU_IRQ,
+ QWBTO_IRQ,
+ WBTO_IRQ,
+ WL2_IRQ,
+ WL1_IRQ,
+};
+
+struct axp288_fg_info {
+ struct platform_device *pdev;
+ struct axp20x_fg_pdata *pdata;
+ struct regmap *regmap;
+ struct regmap_irq_chip_data *regmap_irqc;
+ int irq[AXP288_FG_INTR_NUM];
+ struct power_supply bat;
+ struct mutex lock;
+ int status;
+ struct delayed_work status_monitor;
+ struct dentry *debug_file;
+};
+
+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_MIN_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_OCV,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,
+ POWER_SUPPLY_PROP_TEMP,
+ POWER_SUPPLY_PROP_TEMP_MAX,
+ POWER_SUPPLY_PROP_TEMP_MIN,
+ POWER_SUPPLY_PROP_TEMP_ALERT_MIN,
+ POWER_SUPPLY_PROP_TEMP_ALERT_MAX,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+};
+
+static int fuel_gauge_reg_readb(struct axp288_fg_info *info, int reg)
+{
+ int ret, i;
+ unsigned int val;
+
+ for (i = 0; i < NR_RETRY_CNT; i++) {
+ ret = regmap_read(info->regmap, reg, &val);
+ if (ret == -EBUSY)
+ continue;
+ else
+ break;
+ }
+
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "axp288 reg read err:%d\n", 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->pdev->dev, "axp288 reg write err:%d\n", ret);
+
+ return ret;
+}
+
+static int pmic_read_adc_val(const char *name, int *raw_val,
+ struct axp288_fg_info *info)
+{
+ int ret, val = 0;
+ struct iio_channel *indio_chan;
+
+ indio_chan = iio_channel_get(NULL, name);
+ if (IS_ERR_OR_NULL(indio_chan)) {
+ ret = PTR_ERR(indio_chan);
+ goto exit;
+ }
+ ret = iio_read_channel_raw(indio_chan, &val);
+ if (ret < 0) {
+ dev_err(&info->pdev->dev,
+ "IIO channel read error: %x, %x\n", ret, val);
+ goto err_exit;
+ }
+
+ dev_dbg(&info->pdev->dev, "adc raw val=%x\n", val);
+ *raw_val = val;
+
+err_exit:
+ iio_channel_release(indio_chan);
+exit:
+ return ret;
+}
+
+#ifdef CONFIG_DEBUG_FS
+static int fuel_gauge_debug_show(struct seq_file *s, void *data)
+{
+ struct axp288_fg_info *info = s->private;
+ int raw_val, ret;
+
+ seq_printf(s, " PWR_STATUS[%02x] : %02x\n",
+ AXP20X_PWR_INPUT_STATUS,
+ fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS));
+ seq_printf(s, "PWR_OP_MODE[%02x] : %02x\n",
+ AXP20X_PWR_OP_MODE,
+ fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE));
+ seq_printf(s, " CHRG_CTRL1[%02x] : %02x\n",
+ AXP20X_CHRG_CTRL1,
+ fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1));
+ seq_printf(s, " VLTF[%02x] : %02x\n",
+ AXP20X_V_LTF_DISCHRG,
+ fuel_gauge_reg_readb(info, AXP20X_V_LTF_DISCHRG));
+ seq_printf(s, " VHTF[%02x] : %02x\n",
+ AXP20X_V_HTF_DISCHRG,
+ fuel_gauge_reg_readb(info, AXP20X_V_HTF_DISCHRG));
+ seq_printf(s, " CC_CTRL[%02x] : %02x\n",
+ AXP20X_CC_CTRL,
+ fuel_gauge_reg_readb(info, AXP20X_CC_CTRL));
+ seq_printf(s, "BATTERY CAP[%02x] : %02x\n",
+ AXP20X_FG_RES,
+ fuel_gauge_reg_readb(info, AXP20X_FG_RES));
+ seq_printf(s, " FG_RDC1[%02x] : %02x\n",
+ AXP288_FG_RDC1_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_RDC1_REG));
+ seq_printf(s, " FG_RDC0[%02x] : %02x\n",
+ AXP288_FG_RDC0_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_RDC0_REG));
+ seq_printf(s, " FG_OCVH[%02x] : %02x\n",
+ AXP288_FG_OCVH_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG));
+ seq_printf(s, " FG_OCVL[%02x] : %02x\n",
+ AXP288_FG_OCVL_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG));
+ seq_printf(s, "FG_DES_CAP1[%02x] : %02x\n",
+ AXP288_FG_DES_CAP1_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG));
+ seq_printf(s, "FG_DES_CAP0[%02x] : %02x\n",
+ AXP288_FG_DES_CAP0_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG));
+ seq_printf(s, " FG_CC_MTR1[%02x] : %02x\n",
+ AXP288_FG_CC_MTR1_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG));
+ seq_printf(s, " FG_CC_MTR0[%02x] : %02x\n",
+ AXP288_FG_CC_MTR0_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG));
+ seq_printf(s, " FG_OCV_CAP[%02x] : %02x\n",
+ AXP288_FG_OCV_CAP_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_OCV_CAP_REG));
+ seq_printf(s, " FG_CC_CAP[%02x] : %02x\n",
+ AXP288_FG_CC_CAP_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_CC_CAP_REG));
+ seq_printf(s, " FG_LOW_CAP[%02x] : %02x\n",
+ AXP288_FG_LOW_CAP_REG,
+ fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG));
+ seq_printf(s, "TUNING_CTL0[%02x] : %02x\n",
+ AXP288_FG_TUNE0,
+ fuel_gauge_reg_readb(info, AXP288_FG_TUNE0));
+ seq_printf(s, "TUNING_CTL1[%02x] : %02x\n",
+ AXP288_FG_TUNE1,
+ fuel_gauge_reg_readb(info, AXP288_FG_TUNE1));
+ seq_printf(s, "TUNING_CTL2[%02x] : %02x\n",
+ AXP288_FG_TUNE2,
+ fuel_gauge_reg_readb(info, AXP288_FG_TUNE2));
+ seq_printf(s, "TUNING_CTL3[%02x] : %02x\n",
+ AXP288_FG_TUNE3,
+ fuel_gauge_reg_readb(info, AXP288_FG_TUNE3));
+ seq_printf(s, "TUNING_CTL4[%02x] : %02x\n",
+ AXP288_FG_TUNE4,
+ fuel_gauge_reg_readb(info, AXP288_FG_TUNE4));
+ seq_printf(s, "TUNING_CTL5[%02x] : %02x\n",
+ AXP288_FG_TUNE5,
+ fuel_gauge_reg_readb(info, AXP288_FG_TUNE5));
+
+ ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
+ if (ret >= 0)
+ seq_printf(s, "axp288-batttemp : %d\n", raw_val);
+ ret = pmic_read_adc_val("axp288-pmic-temp", &raw_val, info);
+ if (ret >= 0)
+ seq_printf(s, "axp288-pmictemp : %d\n", raw_val);
+ ret = pmic_read_adc_val("axp288-system-temp", &raw_val, info);
+ if (ret >= 0)
+ seq_printf(s, "axp288-systtemp : %d\n", raw_val);
+ ret = pmic_read_adc_val("axp288-chrg-curr", &raw_val, info);
+ if (ret >= 0)
+ seq_printf(s, "axp288-chrgcurr : %d\n", raw_val);
+ ret = pmic_read_adc_val("axp288-chrg-d-curr", &raw_val, info);
+ if (ret >= 0)
+ seq_printf(s, "axp288-dchrgcur : %d\n", raw_val);
+ ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
+ if (ret >= 0)
+ seq_printf(s, "axp288-battvolt : %d\n", raw_val);
+
+ return 0;
+}
+
+static int debug_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, fuel_gauge_debug_show, inode->i_private);
+}
+
+static const struct file_operations fg_debug_fops = {
+ .open = debug_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
+{
+ info->debug_file = debugfs_create_file("fuelgauge", 0666, NULL,
+ info, &fg_debug_fops);
+}
+
+static void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
+{
+ debugfs_remove(info->debug_file);
+}
+#else
+static inline void fuel_gauge_create_debugfs(struct axp288_fg_info *info)
+{
+}
+static inline void fuel_gauge_remove_debugfs(struct axp288_fg_info *info)
+{
+}
+#endif
+
+static void fuel_gauge_get_status(struct axp288_fg_info *info)
+{
+ int pwr_stat, ret;
+ int charge, discharge;
+
+ pwr_stat = fuel_gauge_reg_readb(info, AXP20X_PWR_INPUT_STATUS);
+ if (pwr_stat < 0) {
+ dev_err(&info->pdev->dev,
+ "PWR STAT read failed:%d\n", pwr_stat);
+ return;
+ }
+ ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
+ if (ret < 0) {
+ dev_err(&info->pdev->dev,
+ "ADC charge current read failed:%d\n", ret);
+ return;
+ }
+ ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
+ if (ret < 0) {
+ dev_err(&info->pdev->dev,
+ "ADC discharge current read failed:%d\n", ret);
+ return;
+ }
+
+ if (charge > 0)
+ info->status = POWER_SUPPLY_STATUS_CHARGING;
+ else if (discharge > 0)
+ info->status = POWER_SUPPLY_STATUS_DISCHARGING;
+ else {
+ if (pwr_stat & CHRG_STAT_BAT_PRESENT)
+ info->status = POWER_SUPPLY_STATUS_FULL;
+ else
+ info->status = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ }
+}
+
+static int fuel_gauge_get_vbatt(struct axp288_fg_info *info, int *vbatt)
+{
+ int ret = 0, raw_val;
+
+ ret = pmic_read_adc_val("axp288-batt-volt", &raw_val, info);
+ if (ret < 0)
+ goto vbatt_read_fail;
+
+ *vbatt = VOLTAGE_FROM_ADC(raw_val);
+vbatt_read_fail:
+ return ret;
+}
+
+static int fuel_gauge_get_current(struct axp288_fg_info *info, int *cur)
+{
+ int ret, value = 0;
+ int charge, discharge;
+
+ ret = pmic_read_adc_val("axp288-chrg-curr", &charge, info);
+ if (ret < 0)
+ goto current_read_fail;
+ ret = pmic_read_adc_val("axp288-chrg-d-curr", &discharge, info);
+ if (ret < 0)
+ goto current_read_fail;
+
+ if (charge > 0)
+ value = charge;
+ else if (discharge > 0)
+ value = -1 * discharge;
+
+ *cur = value;
+current_read_fail:
+ return ret;
+}
+
+static int temp_to_adc(struct axp288_fg_info *info, int tval)
+{
+ int rntc = 0, i, ret, adc_val;
+ int rmin, rmax, tmin, tmax;
+ int tcsz = info->pdata->tcsz;
+
+ /* get the Rntc resitance value for this temp */
+ if (tval > info->pdata->thermistor_curve[0][1]) {
+ rntc = info->pdata->thermistor_curve[0][0];
+ } else if (tval <= info->pdata->thermistor_curve[tcsz-1][1]) {
+ rntc = info->pdata->thermistor_curve[tcsz-1][0];
+ } else {
+ for (i = 1; i < tcsz; i++) {
+ if (tval > info->pdata->thermistor_curve[i][1]) {
+ rmin = info->pdata->thermistor_curve[i-1][0];
+ rmax = info->pdata->thermistor_curve[i][0];
+ tmin = info->pdata->thermistor_curve[i-1][1];
+ tmax = info->pdata->thermistor_curve[i][1];
+ rntc = rmin + ((rmax - rmin) *
+ (tval - tmin) / (tmax - tmin));
+ break;
+ }
+ }
+ }
+
+ /* we need the current to calculate the proper adc voltage */
+ ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
+ if (ret < 0) {
+ dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
+ ret = 0x30;
+ }
+
+ /*
+ * temperature is proportional to NTS thermistor resistance
+ * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
+ * [12-bit ADC VAL] = R_NTC(?) * current / 800
+ */
+ adc_val = rntc * (20 + (20 * ((ret >> 4) & 0x3))) / 800;
+
+ return adc_val;
+}
+
+static int adc_to_temp(struct axp288_fg_info *info, int adc_val)
+{
+ int ret, r, i, tval = 0;
+ int rmin, rmax, tmin, tmax;
+ int tcsz = info->pdata->tcsz;
+
+ ret = fuel_gauge_reg_readb(info, AXP20X_ADC_RATE);
+ if (ret < 0) {
+ dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
+ ret = 0x30;
+ }
+
+ /*
+ * temperature is proportional to NTS thermistor resistance
+ * ADC_RATE[5-4] determines current, 00=20uA,01=40uA,10=60uA,11=80uA
+ * R_NTC(?) = [12-bit ADC VAL] * 800 / current
+ */
+ r = adc_val * 800 / (20 + (20 * ((ret >> 4) & 0x3)));
+
+ if (r < info->pdata->thermistor_curve[0][0]) {
+ tval = info->pdata->thermistor_curve[0][1];
+ } else if (r >= info->pdata->thermistor_curve[tcsz-1][0]) {
+ tval = info->pdata->thermistor_curve[tcsz-1][1];
+ } else {
+ for (i = 1; i < tcsz; i++) {
+ if (r < info->pdata->thermistor_curve[i][0]) {
+ rmin = info->pdata->thermistor_curve[i-1][0];
+ rmax = info->pdata->thermistor_curve[i][0];
+ tmin = info->pdata->thermistor_curve[i-1][1];
+ tmax = info->pdata->thermistor_curve[i][1];
+ tval = tmin + ((tmax - tmin) *
+ (r - rmin) / (rmax - rmin));
+ break;
+ }
+ }
+ }
+
+ return tval;
+}
+
+static int fuel_gauge_get_btemp(struct axp288_fg_info *info, int *btemp)
+{
+ int ret, raw_val = 0;
+
+ ret = pmic_read_adc_val("axp288-batt-temp", &raw_val, info);
+ if (ret < 0)
+ goto temp_read_fail;
+
+ *btemp = adc_to_temp(info, raw_val);
+
+temp_read_fail:
+ return ret;
+}
+
+static int fuel_gauge_get_vocv(struct axp288_fg_info *info, int *vocv)
+{
+ int ret, value;
+
+ /* 12-bit data value, upper 8 in OCVH, lower 4 in OCVL */
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVH_REG);
+ if (ret < 0)
+ goto vocv_read_fail;
+ value = ret << 4;
+
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_OCVL_REG);
+ if (ret < 0)
+ goto vocv_read_fail;
+ value |= (ret & 0xf);
+
+ *vocv = VOLTAGE_FROM_ADC(value);
+vocv_read_fail:
+ return ret;
+}
+
+static int fuel_gauge_battery_health(struct axp288_fg_info *info)
+{
+ int temp, vocv;
+ int ret, health = POWER_SUPPLY_HEALTH_UNKNOWN;
+
+ ret = fuel_gauge_get_btemp(info, &temp);
+ if (ret < 0)
+ goto health_read_fail;
+
+ ret = fuel_gauge_get_vocv(info, &vocv);
+ if (ret < 0)
+ goto health_read_fail;
+
+ if (vocv > info->pdata->max_volt)
+ health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ else if (temp > info->pdata->max_temp)
+ health = POWER_SUPPLY_HEALTH_OVERHEAT;
+ else if (temp < info->pdata->min_temp)
+ health = POWER_SUPPLY_HEALTH_COLD;
+ else if (vocv < info->pdata->min_volt)
+ health = POWER_SUPPLY_HEALTH_DEAD;
+ else
+ health = POWER_SUPPLY_HEALTH_GOOD;
+
+health_read_fail:
+ return health;
+}
+
+static int fuel_gauge_set_high_btemp_alert(struct axp288_fg_info *info)
+{
+ int ret, adc_val;
+
+ /* program temperature threshold as 1/16 ADC value */
+ adc_val = temp_to_adc(info, info->pdata->max_temp);
+ ret = fuel_gauge_reg_writeb(info, AXP20X_V_HTF_DISCHRG, adc_val >> 4);
+
+ return ret;
+}
+
+static int fuel_gauge_set_low_btemp_alert(struct axp288_fg_info *info)
+{
+ int ret, adc_val;
+
+ /* program temperature threshold as 1/16 ADC value */
+ adc_val = temp_to_adc(info, info->pdata->min_temp);
+ ret = fuel_gauge_reg_writeb(info, AXP20X_V_LTF_DISCHRG, adc_val >> 4);
+
+ return ret;
+}
+
+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 = container_of(ps,
+ struct axp288_fg_info, bat);
+ int ret = 0, value;
+
+ mutex_lock(&info->lock);
+ 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:
+ ret = fuel_gauge_get_vbatt(info, &value);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+ val->intval = PROP_VOLT(value);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+ ret = fuel_gauge_get_vocv(info, &value);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+ val->intval = PROP_VOLT(value);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = fuel_gauge_get_current(info, &value);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+ val->intval = PROP_CURR(value);
+ break;
+ case POWER_SUPPLY_PROP_PRESENT:
+ ret = fuel_gauge_reg_readb(info, AXP20X_PWR_OP_MODE);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+
+ if (ret & CHRG_STAT_BAT_PRESENT)
+ val->intval = 1;
+ else
+ val->intval = 0;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+
+ if (!(ret & FG_REP_CAP_VALID))
+ dev_err(&info->pdev->dev,
+ "capacity measurement not valid\n");
+ val->intval = (ret & FG_REP_CAP_VAL_MASK);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+ val->intval = (ret & 0x0f);
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ ret = fuel_gauge_get_btemp(info, &value);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+ val->intval = PROP_TEMP(value);
+ break;
+ case POWER_SUPPLY_PROP_TEMP_MAX:
+ case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
+ val->intval = PROP_TEMP(info->pdata->max_temp);
+ break;
+ case POWER_SUPPLY_PROP_TEMP_MIN:
+ case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
+ val->intval = PROP_TEMP(info->pdata->min_temp);
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR1_REG);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+
+ value = (ret & FG_CC_MTR1_VAL_MASK) << 8;
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_CC_MTR0_REG);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+ value |= (ret & FG_CC_MTR0_VAL_MASK);
+ val->intval = value * FG_DES_CAP_RES_LSB;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+
+ value = (ret & FG_DES_CAP1_VAL_MASK) << 8;
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP0_REG);
+ if (ret < 0)
+ goto fuel_gauge_read_err;
+ value |= (ret & FG_DES_CAP0_VAL_MASK);
+ val->intval = value * FG_DES_CAP_RES_LSB;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ val->intval = PROP_CURR(info->pdata->design_cap);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ val->intval = PROP_VOLT(info->pdata->max_volt);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = PROP_VOLT(info->pdata->min_volt);
+ break;
+ case POWER_SUPPLY_PROP_MODEL_NAME:
+ val->strval = info->pdata->battid;
+ break;
+ default:
+ mutex_unlock(&info->lock);
+ return -EINVAL;
+ }
+
+ mutex_unlock(&info->lock);
+ return 0;
+
+fuel_gauge_read_err:
+ 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 = container_of(ps,
+ struct axp288_fg_info, bat);
+ int ret = 0;
+
+ mutex_lock(&info->lock);
+ switch (prop) {
+ case POWER_SUPPLY_PROP_STATUS:
+ info->status = val->intval;
+ break;
+ case POWER_SUPPLY_PROP_TEMP_MIN:
+ case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
+ if ((val->intval < PD_DEF_MIN_TEMP) ||
+ (val->intval > PD_DEF_MAX_TEMP)) {
+ ret = -EINVAL;
+ break;
+ }
+ info->pdata->min_temp = UNPROP_TEMP(val->intval);
+ ret = fuel_gauge_set_low_btemp_alert(info);
+ if (ret < 0)
+ dev_err(&info->pdev->dev,
+ "temp alert min set fail:%d\n", ret);
+ break;
+ case POWER_SUPPLY_PROP_TEMP_MAX:
+ case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
+ if ((val->intval < PD_DEF_MIN_TEMP) ||
+ (val->intval > PD_DEF_MAX_TEMP)) {
+ ret = -EINVAL;
+ break;
+ }
+ info->pdata->max_temp = UNPROP_TEMP(val->intval);
+ ret = fuel_gauge_set_high_btemp_alert(info);
+ if (ret < 0)
+ dev_err(&info->pdev->dev,
+ "temp alert max set fail:%d\n", ret);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
+ if ((val->intval < 0) || (val->intval > 15)) {
+ ret = -EINVAL;
+ break;
+ }
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_LOW_CAP_REG);
+ if (ret < 0)
+ break;
+ ret &= 0xf0;
+ ret |= (val->intval & 0xf);
+ ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, ret);
+ 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_STATUS:
+ case POWER_SUPPLY_PROP_TEMP_MIN:
+ case POWER_SUPPLY_PROP_TEMP_ALERT_MIN:
+ case POWER_SUPPLY_PROP_TEMP_MAX:
+ case POWER_SUPPLY_PROP_TEMP_ALERT_MAX:
+ case POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN:
+ ret = 1;
+ break;
+ default:
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static void fuel_gauge_status_monitor(struct work_struct *work)
+{
+ struct axp288_fg_info *info = container_of(work,
+ struct axp288_fg_info, status_monitor.work);
+
+ fuel_gauge_get_status(info);
+ power_supply_changed(&info->bat);
+ schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
+}
+
+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->pdev->dev, "spurious interrupt!!\n");
+ return IRQ_NONE;
+ }
+
+ switch (i) {
+ case QWBTU_IRQ:
+ dev_info(&info->pdev->dev,
+ "Quit Battery under temperature in work mode IRQ (QWBTU)\n");
+ break;
+ case WBTU_IRQ:
+ dev_info(&info->pdev->dev,
+ "Battery under temperature in work mode IRQ (WBTU)\n");
+ break;
+ case QWBTO_IRQ:
+ dev_info(&info->pdev->dev,
+ "Quit Battery over temperature in work mode IRQ (QWBTO)\n");
+ break;
+ case WBTO_IRQ:
+ dev_info(&info->pdev->dev,
+ "Battery over temperature in work mode IRQ (WBTO)\n");
+ break;
+ case WL2_IRQ:
+ dev_info(&info->pdev->dev, "Low Batt Warning(2) INTR\n");
+ break;
+ case WL1_IRQ:
+ dev_info(&info->pdev->dev, "Low Batt Warning(1) INTR\n");
+ break;
+ default:
+ dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
+ }
+
+ power_supply_changed(&info->bat);
+ return IRQ_HANDLED;
+}
+
+static void fuel_gauge_external_power_changed(struct power_supply *psy)
+{
+ struct axp288_fg_info *info = container_of(psy,
+ struct axp288_fg_info, bat);
+
+ power_supply_changed(&info->bat);
+}
+
+static int fuel_gauge_set_lowbatt_thresholds(struct axp288_fg_info *info)
+{
+ int ret;
+ u8 reg_val;
+
+ ret = fuel_gauge_reg_readb(info, AXP20X_FG_RES);
+ if (ret < 0) {
+ dev_err(&info->pdev->dev, "%s:read err:%d\n", __func__, ret);
+ return ret;
+ }
+ ret = (ret & FG_REP_CAP_VAL_MASK);
+
+ if (ret > FG_LOW_CAP_WARN_THR)
+ reg_val = FG_LOW_CAP_WARN_THR;
+ else if (ret > FG_LOW_CAP_CRIT_THR)
+ reg_val = FG_LOW_CAP_CRIT_THR;
+ else
+ reg_val = FG_LOW_CAP_SHDN_THR;
+
+ reg_val |= FG_LOW_CAP_THR1_VAL;
+ ret = fuel_gauge_reg_writeb(info, AXP288_FG_LOW_CAP_REG, reg_val);
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "%s:write err:%d\n", __func__, ret);
+
+ return ret;
+}
+
+static int fuel_gauge_program_vbatt_full(struct axp288_fg_info *info)
+{
+ int ret;
+ u8 val;
+
+ ret = fuel_gauge_reg_readb(info, AXP20X_CHRG_CTRL1);
+ if (ret < 0)
+ goto fg_prog_ocv_fail;
+ else
+ val = (ret & ~CHRG_CCCV_CV_MASK);
+
+ switch (info->pdata->max_volt) {
+ case CV_4100:
+ val |= (CHRG_CCCV_CV_4100MV << CHRG_CCCV_CV_BIT_POS);
+ break;
+ case CV_4150:
+ val |= (CHRG_CCCV_CV_4150MV << CHRG_CCCV_CV_BIT_POS);
+ break;
+ case CV_4200:
+ val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
+ break;
+ case CV_4350:
+ val |= (CHRG_CCCV_CV_4350MV << CHRG_CCCV_CV_BIT_POS);
+ break;
+ default:
+ val |= (CHRG_CCCV_CV_4200MV << CHRG_CCCV_CV_BIT_POS);
+ break;
+ }
+
+ ret = fuel_gauge_reg_writeb(info, AXP20X_CHRG_CTRL1, val);
+fg_prog_ocv_fail:
+ return ret;
+}
+
+static int fuel_gauge_program_design_cap(struct axp288_fg_info *info)
+{
+ int ret;
+
+ ret = fuel_gauge_reg_writeb(info,
+ AXP288_FG_DES_CAP1_REG, info->pdata->cap1);
+ if (ret < 0)
+ goto fg_prog_descap_fail;
+
+ ret = fuel_gauge_reg_writeb(info,
+ AXP288_FG_DES_CAP0_REG, info->pdata->cap0);
+
+fg_prog_descap_fail:
+ return ret;
+}
+
+static int fuel_gauge_program_ocv_curve(struct axp288_fg_info *info)
+{
+ int ret = 0, i;
+
+ for (i = 0; i < OCV_CURVE_SIZE; i++) {
+ ret = fuel_gauge_reg_writeb(info,
+ AXP288_FG_OCV_CURVE_REG + i, info->pdata->ocv_curve[i]);
+ if (ret < 0)
+ goto fg_prog_ocv_fail;
+ }
+
+fg_prog_ocv_fail:
+ return ret;
+}
+
+static int fuel_gauge_program_rdc_vals(struct axp288_fg_info *info)
+{
+ int ret;
+
+ ret = fuel_gauge_reg_writeb(info,
+ AXP288_FG_RDC1_REG, info->pdata->rdc1);
+ if (ret < 0)
+ goto fg_prog_ocv_fail;
+
+ ret = fuel_gauge_reg_writeb(info,
+ AXP288_FG_RDC0_REG, info->pdata->rdc0);
+
+fg_prog_ocv_fail:
+ return ret;
+}
+
+static void fuel_gauge_init_config_regs(struct axp288_fg_info *info)
+{
+ int ret;
+
+ /*
+ * check if the config data is already
+ * programmed and if so just return.
+ */
+
+ ret = fuel_gauge_reg_readb(info, AXP288_FG_DES_CAP1_REG);
+ if (ret < 0) {
+ dev_warn(&info->pdev->dev, "CAP1 reg read err!!\n");
+ } else if (!(ret & FG_DES_CAP1_VALID)) {
+ dev_info(&info->pdev->dev, "FG data needs to be initialized\n");
+ } else {
+ dev_info(&info->pdev->dev, "FG data is already initialized\n");
+ return;
+ }
+
+ ret = fuel_gauge_program_vbatt_full(info);
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "set vbatt full fail:%d\n", ret);
+
+ ret = fuel_gauge_program_design_cap(info);
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "set design cap fail:%d\n", ret);
+
+ ret = fuel_gauge_program_rdc_vals(info);
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "set rdc fail:%d\n", ret);
+
+ ret = fuel_gauge_program_ocv_curve(info);
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "set ocv curve fail:%d\n", ret);
+
+ ret = fuel_gauge_set_lowbatt_thresholds(info);
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "lowbatt thr set fail:%d\n", ret);
+
+ ret = fuel_gauge_reg_writeb(info, AXP20X_CC_CTRL, 0xef);
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "gauge cntl set fail:%d\n", ret);
+}
+
+static void fuel_gauge_init_irq(struct axp288_fg_info *info)
+{
+ int ret, i, pirq;
+
+ for (i = 0; i < AXP288_FG_INTR_NUM; i++) {
+ pirq = platform_get_irq(info->pdev, i);
+ info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
+ if (info->irq[i] < 0) {
+ dev_warn(&info->pdev->dev,
+ "regmap_irq get virq failed for IRQ %d: %d\n",
+ pirq, info->irq[i]);
+ info->irq[i] = -1;
+ goto intr_failed;
+ }
+ ret = request_threaded_irq(info->irq[i],
+ NULL, fuel_gauge_thread_handler,
+ IRQF_ONESHOT, DEV_NAME, info);
+ if (ret) {
+ dev_warn(&info->pdev->dev,
+ "request irq failed for IRQ %d: %d\n",
+ pirq, info->irq[i]);
+ info->irq[i] = -1;
+ goto intr_failed;
+ } else {
+ dev_info(&info->pdev->dev, "HW IRQ %d -> VIRQ %d\n",
+ pirq, info->irq[i]);
+ }
+ }
+ return;
+
+intr_failed:
+ for (; i > 0; i--) {
+ free_irq(info->irq[i - 1], info);
+ info->irq[i - 1] = -1;
+ }
+}
+
+static void fuel_gauge_init_hw_regs(struct axp288_fg_info *info)
+{
+ int ret;
+ unsigned int val;
+
+ ret = fuel_gauge_set_high_btemp_alert(info);
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "high batt temp set fail:%d\n", ret);
+
+ ret = fuel_gauge_set_low_btemp_alert(info);
+ if (ret < 0)
+ dev_err(&info->pdev->dev, "low batt temp set fail:%d\n", ret);
+
+ /* enable interrupts */
+ val = fuel_gauge_reg_readb(info, AXP20X_IRQ3_EN);
+ val |= TEMP_IRQ_CFG_MASK;
+ fuel_gauge_reg_writeb(info, AXP20X_IRQ3_EN, val);
+
+ val = fuel_gauge_reg_readb(info, AXP20X_IRQ4_EN);
+ val |= FG_IRQ_CFG_LOWBATT_MASK;
+ val = fuel_gauge_reg_writeb(info, AXP20X_IRQ4_EN, val);
+}
+
+static int axp288_fuel_gauge_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct axp288_fg_info *info;
+ struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
+
+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->pdev = pdev;
+ info->regmap = axp20x->regmap;
+ info->regmap_irqc = axp20x->regmap_irqc;
+ info->status = POWER_SUPPLY_STATUS_UNKNOWN;
+ info->pdata = pdev->dev.platform_data;
+ if (!info->pdata)
+ return -ENODEV;
+
+ platform_set_drvdata(pdev, info);
+
+ mutex_init(&info->lock);
+ INIT_DELAYED_WORK(&info->status_monitor, fuel_gauge_status_monitor);
+
+ info->bat.name = DEV_NAME;
+ info->bat.type = POWER_SUPPLY_TYPE_BATTERY;
+ info->bat.properties = fuel_gauge_props;
+ info->bat.num_properties = ARRAY_SIZE(fuel_gauge_props);
+ info->bat.get_property = fuel_gauge_get_property;
+ info->bat.set_property = fuel_gauge_set_property;
+ info->bat.property_is_writeable = fuel_gauge_property_is_writeable;
+ info->bat.external_power_changed = fuel_gauge_external_power_changed;
+ ret = power_supply_register(&pdev->dev, &info->bat);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register battery: %d\n", ret);
+ return ret;
+ }
+
+ fuel_gauge_create_debugfs(info);
+ fuel_gauge_init_config_regs(info);
+ fuel_gauge_init_irq(info);
+ fuel_gauge_init_hw_regs(info);
+ schedule_delayed_work(&info->status_monitor, STATUS_MON_DELAY_JIFFIES);
+
+ return ret;
+}
+
+static struct platform_device_id axp288_fg_id_table[] = {
+ { .name = DEV_NAME },
+ {},
+};
+
+static int axp288_fuel_gauge_remove(struct platform_device *pdev)
+{
+ struct axp288_fg_info *info = platform_get_drvdata(pdev);
+ int i;
+
+ cancel_delayed_work_sync(&info->status_monitor);
+ power_supply_unregister(&info->bat);
+ fuel_gauge_remove_debugfs(info);
+
+ for (i = 0; i < AXP288_FG_INTR_NUM; i++)
+ if (info->irq[i] >= 0)
+ free_irq(info->irq[i], info);
+
+ return 0;
+}
+
+static struct platform_driver axp288_fuel_gauge_driver = {
+ .probe = axp288_fuel_gauge_probe,
+ .remove = axp288_fuel_gauge_remove,
+ .id_table = axp288_fg_id_table,
+ .driver = {
+ .name = DEV_NAME,
+ },
+};
+
+module_platform_driver(axp288_fuel_gauge_driver);
+
+MODULE_AUTHOR("Todd Brandt <todd.e.brandt@linux.intel.com>");
+MODULE_DESCRIPTION("Xpower AXP288 Fuel Gauge Driver");
+MODULE_LICENSE("GPL");