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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/power/supply/cpcap-battery.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/power/supply/cpcap-battery.c')
-rw-r--r--drivers/power/supply/cpcap-battery.c1180
1 files changed, 1180 insertions, 0 deletions
diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
new file mode 100644
index 000000000..d98d9244e
--- /dev/null
+++ b/drivers/power/supply/cpcap-battery.c
@@ -0,0 +1,1180 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Battery driver for CPCAP PMIC
+ *
+ * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
+ *
+ * Some parts of the code based on earlier Motorola mapphone Linux kernel
+ * drivers:
+ *
+ * Copyright (C) 2009-2010 Motorola, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/moduleparam.h>
+
+#include <linux/iio/consumer.h>
+#include <linux/iio/types.h>
+#include <linux/mfd/motorola-cpcap.h>
+
+/*
+ * Register bit defines for CPCAP_REG_BPEOL. Some of these seem to
+ * map to MC13783UG.pdf "Table 5-19. Register 13, Power Control 0"
+ * to enable BATTDETEN, LOBAT and EOL features. We currently use
+ * LOBAT interrupts instead of EOL.
+ */
+#define CPCAP_REG_BPEOL_BIT_EOL9 BIT(9) /* Set for EOL irq */
+#define CPCAP_REG_BPEOL_BIT_EOL8 BIT(8) /* Set for EOL irq */
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN7 BIT(7)
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN6 BIT(6)
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN5 BIT(5)
+#define CPCAP_REG_BPEOL_BIT_EOL_MULTI BIT(4) /* Set for multiple EOL irqs */
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN3 BIT(3)
+#define CPCAP_REG_BPEOL_BIT_UNKNOWN2 BIT(2)
+#define CPCAP_REG_BPEOL_BIT_BATTDETEN BIT(1) /* Enable battery detect */
+#define CPCAP_REG_BPEOL_BIT_EOLSEL BIT(0) /* BPDET = 0, EOL = 1 */
+
+/*
+ * Register bit defines for CPCAP_REG_CCC1. These seem similar to the twl6030
+ * coulomb counter registers rather than the mc13892 registers. Both twl6030
+ * and mc13892 set bits 2 and 1 to reset and clear registers. But mc13892
+ * sets bit 0 to start the coulomb counter while twl6030 sets bit 0 to stop
+ * the coulomb counter like cpcap does. So for now, we use the twl6030 style
+ * naming for the registers.
+ */
+#define CPCAP_REG_CCC1_ACTIVE_MODE1 BIT(4) /* Update rate */
+#define CPCAP_REG_CCC1_ACTIVE_MODE0 BIT(3) /* Update rate */
+#define CPCAP_REG_CCC1_AUTOCLEAR BIT(2) /* Resets sample registers */
+#define CPCAP_REG_CCC1_CAL_EN BIT(1) /* Clears after write in 1s */
+#define CPCAP_REG_CCC1_PAUSE BIT(0) /* Stop counters, allow write */
+#define CPCAP_REG_CCC1_RESET_MASK (CPCAP_REG_CCC1_AUTOCLEAR | \
+ CPCAP_REG_CCC1_CAL_EN)
+
+#define CPCAP_REG_CCCC2_RATE1 BIT(5)
+#define CPCAP_REG_CCCC2_RATE0 BIT(4)
+#define CPCAP_REG_CCCC2_ENABLE BIT(3)
+
+#define CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS 250
+
+#define CPCAP_BATTERY_EB41_HW4X_ID 0x9E
+#define CPCAP_BATTERY_BW8X_ID 0x98
+
+enum {
+ CPCAP_BATTERY_IIO_BATTDET,
+ CPCAP_BATTERY_IIO_VOLTAGE,
+ CPCAP_BATTERY_IIO_CHRG_CURRENT,
+ CPCAP_BATTERY_IIO_BATT_CURRENT,
+ CPCAP_BATTERY_IIO_NR,
+};
+
+enum cpcap_battery_irq_action {
+ CPCAP_BATTERY_IRQ_ACTION_NONE,
+ CPCAP_BATTERY_IRQ_ACTION_CC_CAL_DONE,
+ CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW,
+ CPCAP_BATTERY_IRQ_ACTION_POWEROFF,
+};
+
+struct cpcap_interrupt_desc {
+ const char *name;
+ struct list_head node;
+ int irq;
+ enum cpcap_battery_irq_action action;
+};
+
+struct cpcap_battery_config {
+ int cd_factor;
+ struct power_supply_info info;
+ struct power_supply_battery_info bat;
+};
+
+struct cpcap_coulomb_counter_data {
+ s32 sample; /* 24 or 32 bits */
+ s32 accumulator;
+ s16 offset; /* 9 bits */
+ s16 integrator; /* 13 or 16 bits */
+};
+
+enum cpcap_battery_state {
+ CPCAP_BATTERY_STATE_PREVIOUS,
+ CPCAP_BATTERY_STATE_LATEST,
+ CPCAP_BATTERY_STATE_EMPTY,
+ CPCAP_BATTERY_STATE_FULL,
+ CPCAP_BATTERY_STATE_NR,
+};
+
+struct cpcap_battery_state_data {
+ int voltage;
+ int current_ua;
+ int counter_uah;
+ int temperature;
+ ktime_t time;
+ struct cpcap_coulomb_counter_data cc;
+};
+
+struct cpcap_battery_ddata {
+ struct device *dev;
+ struct regmap *reg;
+ struct list_head irq_list;
+ struct iio_channel *channels[CPCAP_BATTERY_IIO_NR];
+ struct power_supply *psy;
+ struct cpcap_battery_config config;
+ struct cpcap_battery_state_data state[CPCAP_BATTERY_STATE_NR];
+ u32 cc_lsb; /* μAms per LSB */
+ atomic_t active;
+ int charge_full;
+ int status;
+ u16 vendor;
+ bool check_nvmem;
+ unsigned int is_full:1;
+};
+
+#define CPCAP_NO_BATTERY -400
+
+static bool ignore_temperature_probe;
+module_param(ignore_temperature_probe, bool, 0660);
+
+static struct cpcap_battery_state_data *
+cpcap_battery_get_state(struct cpcap_battery_ddata *ddata,
+ enum cpcap_battery_state state)
+{
+ if (state >= CPCAP_BATTERY_STATE_NR)
+ return NULL;
+
+ return &ddata->state[state];
+}
+
+static struct cpcap_battery_state_data *
+cpcap_battery_latest(struct cpcap_battery_ddata *ddata)
+{
+ return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_LATEST);
+}
+
+static struct cpcap_battery_state_data *
+cpcap_battery_previous(struct cpcap_battery_ddata *ddata)
+{
+ return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_PREVIOUS);
+}
+
+static struct cpcap_battery_state_data *
+cpcap_battery_get_empty(struct cpcap_battery_ddata *ddata)
+{
+ return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_EMPTY);
+}
+
+static struct cpcap_battery_state_data *
+cpcap_battery_get_full(struct cpcap_battery_ddata *ddata)
+{
+ return cpcap_battery_get_state(ddata, CPCAP_BATTERY_STATE_FULL);
+}
+
+static int cpcap_charger_battery_temperature(struct cpcap_battery_ddata *ddata,
+ int *value)
+{
+ struct iio_channel *channel;
+ int error;
+
+ channel = ddata->channels[CPCAP_BATTERY_IIO_BATTDET];
+ error = iio_read_channel_processed(channel, value);
+ if (error < 0) {
+ if (!ignore_temperature_probe)
+ dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
+ *value = CPCAP_NO_BATTERY;
+
+ return error;
+ }
+
+ *value /= 100;
+
+ return 0;
+}
+
+static int cpcap_battery_get_voltage(struct cpcap_battery_ddata *ddata)
+{
+ struct iio_channel *channel;
+ int error, value = 0;
+
+ channel = ddata->channels[CPCAP_BATTERY_IIO_VOLTAGE];
+ error = iio_read_channel_processed(channel, &value);
+ if (error < 0) {
+ dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
+
+ return 0;
+ }
+
+ return value * 1000;
+}
+
+static int cpcap_battery_get_current(struct cpcap_battery_ddata *ddata)
+{
+ struct iio_channel *channel;
+ int error, value = 0;
+
+ channel = ddata->channels[CPCAP_BATTERY_IIO_BATT_CURRENT];
+ error = iio_read_channel_processed(channel, &value);
+ if (error < 0) {
+ dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
+
+ return 0;
+ }
+
+ return value * 1000;
+}
+
+/**
+ * cpcap_battery_cc_raw_div - calculate and divide coulomb counter μAms values
+ * @ddata: device driver data
+ * @sample: coulomb counter sample value
+ * @accumulator: coulomb counter integrator value
+ * @offset: coulomb counter offset value
+ * @divider: conversion divider
+ *
+ * Note that cc_lsb and cc_dur values are from Motorola Linux kernel
+ * function data_get_avg_curr_ua() and seem to be based on measured test
+ * results. It also has the following comment:
+ *
+ * Adjustment factors are applied here as a temp solution per the test
+ * results. Need to work out a formal solution for this adjustment.
+ *
+ * A coulomb counter for similar hardware seems to be documented in
+ * "TWL6030 Gas Gauging Basics (Rev. A)" swca095a.pdf in chapter
+ * "10 Calculating Accumulated Current". We however follow what the
+ * Motorola mapphone Linux kernel is doing as there may be either a
+ * TI or ST coulomb counter in the PMIC.
+ */
+static int cpcap_battery_cc_raw_div(struct cpcap_battery_ddata *ddata,
+ s32 sample, s32 accumulator,
+ s16 offset, u32 divider)
+{
+ s64 acc;
+
+ if (!divider)
+ return 0;
+
+ acc = accumulator;
+ acc -= (s64)sample * offset;
+ acc *= ddata->cc_lsb;
+ acc *= -1;
+ acc = div_s64(acc, divider);
+
+ return acc;
+}
+
+/* 3600000μAms = 1μAh */
+static int cpcap_battery_cc_to_uah(struct cpcap_battery_ddata *ddata,
+ s32 sample, s32 accumulator,
+ s16 offset)
+{
+ return cpcap_battery_cc_raw_div(ddata, sample,
+ accumulator, offset,
+ 3600000);
+}
+
+static int cpcap_battery_cc_to_ua(struct cpcap_battery_ddata *ddata,
+ s32 sample, s32 accumulator,
+ s16 offset)
+{
+ return cpcap_battery_cc_raw_div(ddata, sample,
+ accumulator, offset,
+ sample *
+ CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS);
+}
+
+/**
+ * cpcap_battery_read_accumulated - reads cpcap coulomb counter
+ * @ddata: device driver data
+ * @ccd: coulomb counter values
+ *
+ * Based on Motorola mapphone kernel function data_read_regs().
+ * Looking at the registers, the coulomb counter seems similar to
+ * the coulomb counter in TWL6030. See "TWL6030 Gas Gauging Basics
+ * (Rev. A) swca095a.pdf for "10 Calculating Accumulated Current".
+ *
+ * Note that swca095a.pdf instructs to stop the coulomb counter
+ * before reading to avoid values changing. Motorola mapphone
+ * Linux kernel does not do it, so let's assume they've verified
+ * the data produced is correct.
+ */
+static int
+cpcap_battery_read_accumulated(struct cpcap_battery_ddata *ddata,
+ struct cpcap_coulomb_counter_data *ccd)
+{
+ u16 buf[7]; /* CPCAP_REG_CCS1 to CCI */
+ int error;
+
+ ccd->sample = 0;
+ ccd->accumulator = 0;
+ ccd->offset = 0;
+ ccd->integrator = 0;
+
+ /* Read coulomb counter register range */
+ error = regmap_bulk_read(ddata->reg, CPCAP_REG_CCS1,
+ buf, ARRAY_SIZE(buf));
+ if (error)
+ return 0;
+
+ /* Sample value CPCAP_REG_CCS1 & 2 */
+ ccd->sample = (buf[1] & 0x0fff) << 16;
+ ccd->sample |= buf[0];
+ if (ddata->vendor == CPCAP_VENDOR_TI)
+ ccd->sample = sign_extend32(24, ccd->sample);
+
+ /* Accumulator value CPCAP_REG_CCA1 & 2 */
+ ccd->accumulator = ((s16)buf[3]) << 16;
+ ccd->accumulator |= buf[2];
+
+ /*
+ * Coulomb counter calibration offset is CPCAP_REG_CCM,
+ * REG_CCO seems unused
+ */
+ ccd->offset = buf[4];
+ ccd->offset = sign_extend32(ccd->offset, 9);
+
+ /* Integrator register CPCAP_REG_CCI */
+ if (ddata->vendor == CPCAP_VENDOR_TI)
+ ccd->integrator = sign_extend32(buf[6], 13);
+ else
+ ccd->integrator = (s16)buf[6];
+
+ return cpcap_battery_cc_to_uah(ddata,
+ ccd->sample,
+ ccd->accumulator,
+ ccd->offset);
+}
+
+
+/*
+ * Based on the values from Motorola mapphone Linux kernel for the
+ * stock Droid 4 battery eb41. In the Motorola mapphone Linux
+ * kernel tree the value for pm_cd_factor is passed to the kernel
+ * via device tree. If it turns out to be something device specific
+ * we can consider that too later. These values are also fine for
+ * Bionic's hw4x.
+ *
+ * And looking at the battery full and shutdown values for the stock
+ * kernel on droid 4, full is 4351000 and software initiates shutdown
+ * at 3078000. The device will die around 2743000.
+ */
+static const struct cpcap_battery_config cpcap_battery_eb41_data = {
+ .cd_factor = 0x3cc,
+ .info.technology = POWER_SUPPLY_TECHNOLOGY_LION,
+ .info.voltage_max_design = 4351000,
+ .info.voltage_min_design = 3100000,
+ .info.charge_full_design = 1740000,
+ .bat.constant_charge_voltage_max_uv = 4200000,
+};
+
+/* Values for the extended Droid Bionic battery bw8x. */
+static const struct cpcap_battery_config cpcap_battery_bw8x_data = {
+ .cd_factor = 0x3cc,
+ .info.technology = POWER_SUPPLY_TECHNOLOGY_LION,
+ .info.voltage_max_design = 4200000,
+ .info.voltage_min_design = 3200000,
+ .info.charge_full_design = 2760000,
+ .bat.constant_charge_voltage_max_uv = 4200000,
+};
+
+/*
+ * Safe values for any lipo battery likely to fit into a mapphone
+ * battery bay.
+ */
+static const struct cpcap_battery_config cpcap_battery_unkown_data = {
+ .cd_factor = 0x3cc,
+ .info.technology = POWER_SUPPLY_TECHNOLOGY_LION,
+ .info.voltage_max_design = 4200000,
+ .info.voltage_min_design = 3200000,
+ .info.charge_full_design = 3000000,
+ .bat.constant_charge_voltage_max_uv = 4200000,
+};
+
+static int cpcap_battery_match_nvmem(struct device *dev, const void *data)
+{
+ if (strcmp(dev_name(dev), "89-500029ba0f73") == 0)
+ return 1;
+ else
+ return 0;
+}
+
+static void cpcap_battery_detect_battery_type(struct cpcap_battery_ddata *ddata)
+{
+ struct nvmem_device *nvmem;
+ u8 battery_id = 0;
+
+ ddata->check_nvmem = false;
+
+ nvmem = nvmem_device_find(NULL, &cpcap_battery_match_nvmem);
+ if (IS_ERR_OR_NULL(nvmem)) {
+ ddata->check_nvmem = true;
+ dev_info_once(ddata->dev, "Can not find battery nvmem device. Assuming generic lipo battery\n");
+ } else if (nvmem_device_read(nvmem, 2, 1, &battery_id) < 0) {
+ battery_id = 0;
+ ddata->check_nvmem = true;
+ dev_warn(ddata->dev, "Can not read battery nvmem device. Assuming generic lipo battery\n");
+ }
+
+ switch (battery_id) {
+ case CPCAP_BATTERY_EB41_HW4X_ID:
+ ddata->config = cpcap_battery_eb41_data;
+ break;
+ case CPCAP_BATTERY_BW8X_ID:
+ ddata->config = cpcap_battery_bw8x_data;
+ break;
+ default:
+ ddata->config = cpcap_battery_unkown_data;
+ }
+}
+
+/**
+ * cpcap_battery_cc_get_avg_current - read cpcap coulumb counter
+ * @ddata: cpcap battery driver device data
+ */
+static int cpcap_battery_cc_get_avg_current(struct cpcap_battery_ddata *ddata)
+{
+ int value, acc, error;
+ s32 sample;
+ s16 offset;
+
+ /* Coulomb counter integrator */
+ error = regmap_read(ddata->reg, CPCAP_REG_CCI, &value);
+ if (error)
+ return error;
+
+ if (ddata->vendor == CPCAP_VENDOR_TI) {
+ acc = sign_extend32(value, 13);
+ sample = 1;
+ } else {
+ acc = (s16)value;
+ sample = 4;
+ }
+
+ /* Coulomb counter calibration offset */
+ error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value);
+ if (error)
+ return error;
+
+ offset = sign_extend32(value, 9);
+
+ return cpcap_battery_cc_to_ua(ddata, sample, acc, offset);
+}
+
+static int cpcap_battery_get_charger_status(struct cpcap_battery_ddata *ddata,
+ int *val)
+{
+ union power_supply_propval prop;
+ struct power_supply *charger;
+ int error;
+
+ charger = power_supply_get_by_name("usb");
+ if (!charger)
+ return -ENODEV;
+
+ error = power_supply_get_property(charger, POWER_SUPPLY_PROP_STATUS,
+ &prop);
+ if (error)
+ *val = POWER_SUPPLY_STATUS_UNKNOWN;
+ else
+ *val = prop.intval;
+
+ power_supply_put(charger);
+
+ return error;
+}
+
+static bool cpcap_battery_full(struct cpcap_battery_ddata *ddata)
+{
+ struct cpcap_battery_state_data *state = cpcap_battery_latest(ddata);
+ unsigned int vfull;
+ int error, val;
+
+ error = cpcap_battery_get_charger_status(ddata, &val);
+ if (!error) {
+ switch (val) {
+ case POWER_SUPPLY_STATUS_DISCHARGING:
+ dev_dbg(ddata->dev, "charger disconnected\n");
+ ddata->is_full = 0;
+ break;
+ case POWER_SUPPLY_STATUS_FULL:
+ dev_dbg(ddata->dev, "charger full status\n");
+ ddata->is_full = 1;
+ break;
+ default:
+ break;
+ }
+ }
+
+ /*
+ * The full battery voltage here can be inaccurate, it's used just to
+ * filter out any trickle charging events. We clear the is_full status
+ * on charger disconnect above anyways.
+ */
+ vfull = ddata->config.bat.constant_charge_voltage_max_uv - 120000;
+
+ if (ddata->is_full && state->voltage < vfull)
+ ddata->is_full = 0;
+
+ return ddata->is_full;
+}
+
+static bool cpcap_battery_low(struct cpcap_battery_ddata *ddata)
+{
+ struct cpcap_battery_state_data *state = cpcap_battery_latest(ddata);
+ static bool is_low;
+
+ if (state->current_ua > 0 && (state->voltage <= 3350000 || is_low))
+ is_low = true;
+ else
+ is_low = false;
+
+ return is_low;
+}
+
+static int cpcap_battery_update_status(struct cpcap_battery_ddata *ddata)
+{
+ struct cpcap_battery_state_data state, *latest, *previous,
+ *empty, *full;
+ ktime_t now;
+ int error;
+
+ memset(&state, 0, sizeof(state));
+ now = ktime_get();
+
+ latest = cpcap_battery_latest(ddata);
+ if (latest) {
+ s64 delta_ms = ktime_to_ms(ktime_sub(now, latest->time));
+
+ if (delta_ms < CPCAP_BATTERY_CC_SAMPLE_PERIOD_MS)
+ return delta_ms;
+ }
+
+ state.time = now;
+ state.voltage = cpcap_battery_get_voltage(ddata);
+ state.current_ua = cpcap_battery_get_current(ddata);
+ state.counter_uah = cpcap_battery_read_accumulated(ddata, &state.cc);
+
+ error = cpcap_charger_battery_temperature(ddata,
+ &state.temperature);
+ if (error)
+ return error;
+
+ previous = cpcap_battery_previous(ddata);
+ memcpy(previous, latest, sizeof(*previous));
+ memcpy(latest, &state, sizeof(*latest));
+
+ if (cpcap_battery_full(ddata)) {
+ full = cpcap_battery_get_full(ddata);
+ memcpy(full, latest, sizeof(*full));
+
+ empty = cpcap_battery_get_empty(ddata);
+ if (empty->voltage && empty->voltage != -1) {
+ empty->voltage = -1;
+ ddata->charge_full =
+ empty->counter_uah - full->counter_uah;
+ } else if (ddata->charge_full) {
+ empty->voltage = -1;
+ empty->counter_uah =
+ full->counter_uah + ddata->charge_full;
+ }
+ } else if (cpcap_battery_low(ddata)) {
+ empty = cpcap_battery_get_empty(ddata);
+ memcpy(empty, latest, sizeof(*empty));
+
+ full = cpcap_battery_get_full(ddata);
+ if (full->voltage) {
+ full->voltage = 0;
+ ddata->charge_full =
+ empty->counter_uah - full->counter_uah;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Update battery status when cpcap-charger calls power_supply_changed().
+ * This allows us to detect battery full condition before the charger
+ * disconnects.
+ */
+static void cpcap_battery_external_power_changed(struct power_supply *psy)
+{
+ union power_supply_propval prop;
+
+ power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, &prop);
+}
+
+static enum power_supply_property cpcap_battery_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_PRESENT,
+ POWER_SUPPLY_PROP_TECHNOLOGY,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+ POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL,
+ POWER_SUPPLY_PROP_CHARGE_NOW,
+ POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+ POWER_SUPPLY_PROP_CHARGE_COUNTER,
+ POWER_SUPPLY_PROP_POWER_NOW,
+ POWER_SUPPLY_PROP_POWER_AVG,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+ POWER_SUPPLY_PROP_SCOPE,
+ POWER_SUPPLY_PROP_TEMP,
+};
+
+static int cpcap_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct cpcap_battery_ddata *ddata = power_supply_get_drvdata(psy);
+ struct cpcap_battery_state_data *latest, *previous, *empty;
+ u32 sample;
+ s32 accumulator;
+ int cached;
+ s64 tmp;
+
+ cached = cpcap_battery_update_status(ddata);
+ if (cached < 0)
+ return cached;
+
+ latest = cpcap_battery_latest(ddata);
+ previous = cpcap_battery_previous(ddata);
+
+ if (ddata->check_nvmem)
+ cpcap_battery_detect_battery_type(ddata);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_PRESENT:
+ if (latest->temperature > CPCAP_NO_BATTERY || ignore_temperature_probe)
+ val->intval = 1;
+ else
+ val->intval = 0;
+ break;
+ case POWER_SUPPLY_PROP_STATUS:
+ if (cpcap_battery_full(ddata)) {
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ break;
+ }
+ if (cpcap_battery_cc_get_avg_current(ddata) < 0)
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ else
+ val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+ break;
+ case POWER_SUPPLY_PROP_TECHNOLOGY:
+ val->intval = ddata->config.info.technology;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ val->intval = cpcap_battery_get_voltage(ddata);
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN:
+ val->intval = ddata->config.info.voltage_max_design;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
+ val->intval = ddata->config.info.voltage_min_design;
+ break;
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ val->intval = ddata->config.bat.constant_charge_voltage_max_uv;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ sample = latest->cc.sample - previous->cc.sample;
+ if (!sample) {
+ val->intval = cpcap_battery_cc_get_avg_current(ddata);
+ break;
+ }
+ accumulator = latest->cc.accumulator - previous->cc.accumulator;
+ val->intval = cpcap_battery_cc_to_ua(ddata, sample,
+ accumulator,
+ latest->cc.offset);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ val->intval = latest->current_ua;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_COUNTER:
+ val->intval = latest->counter_uah;
+ break;
+ case POWER_SUPPLY_PROP_POWER_NOW:
+ tmp = (latest->voltage / 10000) * latest->current_ua;
+ val->intval = div64_s64(tmp, 100);
+ break;
+ case POWER_SUPPLY_PROP_POWER_AVG:
+ sample = latest->cc.sample - previous->cc.sample;
+ if (!sample) {
+ tmp = cpcap_battery_cc_get_avg_current(ddata);
+ tmp *= (latest->voltage / 10000);
+ val->intval = div64_s64(tmp, 100);
+ break;
+ }
+ accumulator = latest->cc.accumulator - previous->cc.accumulator;
+ tmp = cpcap_battery_cc_to_ua(ddata, sample, accumulator,
+ latest->cc.offset);
+ tmp *= ((latest->voltage + previous->voltage) / 20000);
+ val->intval = div64_s64(tmp, 100);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ empty = cpcap_battery_get_empty(ddata);
+ if (!empty->voltage || !ddata->charge_full)
+ return -ENODATA;
+ /* (ddata->charge_full / 200) is needed for rounding */
+ val->intval = empty->counter_uah - latest->counter_uah +
+ ddata->charge_full / 200;
+ val->intval = clamp(val->intval, 0, ddata->charge_full);
+ val->intval = val->intval * 100 / ddata->charge_full;
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+ if (cpcap_battery_full(ddata))
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
+ else if (latest->voltage >= 3750000)
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_HIGH;
+ else if (latest->voltage >= 3300000)
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+ else if (latest->voltage > 3100000)
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+ else if (latest->voltage <= 3100000)
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
+ else
+ val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_NOW:
+ empty = cpcap_battery_get_empty(ddata);
+ if (!empty->voltage)
+ return -ENODATA;
+ val->intval = empty->counter_uah - latest->counter_uah;
+ if (val->intval < 0) {
+ /* Assume invalid config if CHARGE_NOW is -20% */
+ if (ddata->charge_full && abs(val->intval) > ddata->charge_full/5) {
+ empty->voltage = 0;
+ ddata->charge_full = 0;
+ return -ENODATA;
+ }
+ val->intval = 0;
+ } else if (ddata->charge_full && ddata->charge_full < val->intval) {
+ /* Assume invalid config if CHARGE_NOW exceeds CHARGE_FULL by 20% */
+ if (val->intval > (6*ddata->charge_full)/5) {
+ empty->voltage = 0;
+ ddata->charge_full = 0;
+ return -ENODATA;
+ }
+ val->intval = ddata->charge_full;
+ }
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ if (!ddata->charge_full)
+ return -ENODATA;
+ val->intval = ddata->charge_full;
+ break;
+ case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
+ val->intval = ddata->config.info.charge_full_design;
+ break;
+ case POWER_SUPPLY_PROP_SCOPE:
+ val->intval = POWER_SUPPLY_SCOPE_SYSTEM;
+ break;
+ case POWER_SUPPLY_PROP_TEMP:
+ if (ignore_temperature_probe)
+ return -ENODATA;
+ val->intval = latest->temperature;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int cpcap_battery_update_charger(struct cpcap_battery_ddata *ddata,
+ int const_charge_voltage)
+{
+ union power_supply_propval prop;
+ union power_supply_propval val;
+ struct power_supply *charger;
+ int error;
+
+ charger = power_supply_get_by_name("usb");
+ if (!charger)
+ return -ENODEV;
+
+ error = power_supply_get_property(charger,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+ &prop);
+ if (error)
+ goto out_put;
+
+ /* Allow charger const voltage lower than battery const voltage */
+ if (const_charge_voltage > prop.intval)
+ goto out_put;
+
+ val.intval = const_charge_voltage;
+
+ error = power_supply_set_property(charger,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+ &val);
+out_put:
+ power_supply_put(charger);
+
+ return error;
+}
+
+static int cpcap_battery_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct cpcap_battery_ddata *ddata = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ if (val->intval < ddata->config.info.voltage_min_design)
+ return -EINVAL;
+ if (val->intval > ddata->config.info.voltage_max_design)
+ return -EINVAL;
+
+ ddata->config.bat.constant_charge_voltage_max_uv = val->intval;
+
+ return cpcap_battery_update_charger(ddata, val->intval);
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ if (val->intval < 0)
+ return -EINVAL;
+ if (val->intval > (6*ddata->config.info.charge_full_design)/5)
+ return -EINVAL;
+
+ ddata->charge_full = val->intval;
+
+ return 0;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int cpcap_battery_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ case POWER_SUPPLY_PROP_CHARGE_FULL:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static irqreturn_t cpcap_battery_irq_thread(int irq, void *data)
+{
+ struct cpcap_battery_ddata *ddata = data;
+ struct cpcap_battery_state_data *latest;
+ struct cpcap_interrupt_desc *d;
+
+ if (!atomic_read(&ddata->active))
+ return IRQ_NONE;
+
+ list_for_each_entry(d, &ddata->irq_list, node) {
+ if (irq == d->irq)
+ break;
+ }
+
+ if (list_entry_is_head(d, &ddata->irq_list, node))
+ return IRQ_NONE;
+
+ latest = cpcap_battery_latest(ddata);
+
+ switch (d->action) {
+ case CPCAP_BATTERY_IRQ_ACTION_CC_CAL_DONE:
+ dev_info(ddata->dev, "Coulomb counter calibration done\n");
+ break;
+ case CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW:
+ if (latest->current_ua >= 0)
+ dev_warn(ddata->dev, "Battery low at %imV!\n",
+ latest->voltage / 1000);
+ break;
+ case CPCAP_BATTERY_IRQ_ACTION_POWEROFF:
+ if (latest->current_ua >= 0 && latest->voltage <= 3200000) {
+ dev_emerg(ddata->dev,
+ "Battery empty at %imV, powering off\n",
+ latest->voltage / 1000);
+ orderly_poweroff(true);
+ }
+ break;
+ default:
+ break;
+ }
+
+ power_supply_changed(ddata->psy);
+
+ return IRQ_HANDLED;
+}
+
+static int cpcap_battery_init_irq(struct platform_device *pdev,
+ struct cpcap_battery_ddata *ddata,
+ const char *name)
+{
+ struct cpcap_interrupt_desc *d;
+ int irq, error;
+
+ irq = platform_get_irq_byname(pdev, name);
+ if (irq < 0)
+ return irq;
+
+ error = devm_request_threaded_irq(ddata->dev, irq, NULL,
+ cpcap_battery_irq_thread,
+ IRQF_SHARED | IRQF_ONESHOT,
+ name, ddata);
+ if (error) {
+ dev_err(ddata->dev, "could not get irq %s: %i\n",
+ name, error);
+
+ return error;
+ }
+
+ d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
+ if (!d)
+ return -ENOMEM;
+
+ d->name = name;
+ d->irq = irq;
+
+ if (!strncmp(name, "cccal", 5))
+ d->action = CPCAP_BATTERY_IRQ_ACTION_CC_CAL_DONE;
+ else if (!strncmp(name, "lowbph", 6))
+ d->action = CPCAP_BATTERY_IRQ_ACTION_BATTERY_LOW;
+ else if (!strncmp(name, "lowbpl", 6))
+ d->action = CPCAP_BATTERY_IRQ_ACTION_POWEROFF;
+
+ list_add(&d->node, &ddata->irq_list);
+
+ return 0;
+}
+
+static int cpcap_battery_init_interrupts(struct platform_device *pdev,
+ struct cpcap_battery_ddata *ddata)
+{
+ static const char * const cpcap_battery_irqs[] = {
+ "eol", "lowbph", "lowbpl",
+ "chrgcurr1", "battdetb"
+ };
+ int i, error;
+
+ for (i = 0; i < ARRAY_SIZE(cpcap_battery_irqs); i++) {
+ error = cpcap_battery_init_irq(pdev, ddata,
+ cpcap_battery_irqs[i]);
+ if (error)
+ return error;
+ }
+
+ /* Enable calibration interrupt if already available in dts */
+ cpcap_battery_init_irq(pdev, ddata, "cccal");
+
+ /* Enable low battery interrupts for 3.3V high and 3.1V low */
+ error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL,
+ 0xffff,
+ CPCAP_REG_BPEOL_BIT_BATTDETEN);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static int cpcap_battery_init_iio(struct cpcap_battery_ddata *ddata)
+{
+ const char * const names[CPCAP_BATTERY_IIO_NR] = {
+ "battdetb", "battp", "chg_isense", "batti",
+ };
+ int error, i;
+
+ for (i = 0; i < CPCAP_BATTERY_IIO_NR; i++) {
+ ddata->channels[i] = devm_iio_channel_get(ddata->dev,
+ names[i]);
+ if (IS_ERR(ddata->channels[i])) {
+ error = PTR_ERR(ddata->channels[i]);
+ goto out_err;
+ }
+
+ if (!ddata->channels[i]->indio_dev) {
+ error = -ENXIO;
+ goto out_err;
+ }
+ }
+
+ return 0;
+
+out_err:
+ return dev_err_probe(ddata->dev, error,
+ "could not initialize VBUS or ID IIO\n");
+}
+
+/* Calibrate coulomb counter */
+static int cpcap_battery_calibrate(struct cpcap_battery_ddata *ddata)
+{
+ int error, ccc1, value;
+ unsigned long timeout;
+
+ error = regmap_read(ddata->reg, CPCAP_REG_CCC1, &ccc1);
+ if (error)
+ return error;
+
+ timeout = jiffies + msecs_to_jiffies(6000);
+
+ /* Start calibration */
+ error = regmap_update_bits(ddata->reg, CPCAP_REG_CCC1,
+ 0xffff,
+ CPCAP_REG_CCC1_CAL_EN);
+ if (error)
+ goto restore;
+
+ while (time_before(jiffies, timeout)) {
+ error = regmap_read(ddata->reg, CPCAP_REG_CCC1, &value);
+ if (error)
+ goto restore;
+
+ if (!(value & CPCAP_REG_CCC1_CAL_EN))
+ break;
+
+ error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value);
+ if (error)
+ goto restore;
+
+ msleep(300);
+ }
+
+ /* Read calibration offset from CCM */
+ error = regmap_read(ddata->reg, CPCAP_REG_CCM, &value);
+ if (error)
+ goto restore;
+
+ dev_info(ddata->dev, "calibration done: 0x%04x\n", value);
+
+restore:
+ if (error)
+ dev_err(ddata->dev, "%s: error %i\n", __func__, error);
+
+ error = regmap_update_bits(ddata->reg, CPCAP_REG_CCC1,
+ 0xffff, ccc1);
+ if (error)
+ dev_err(ddata->dev, "%s: restore error %i\n",
+ __func__, error);
+
+ return error;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id cpcap_battery_id_table[] = {
+ {
+ .compatible = "motorola,cpcap-battery",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, cpcap_battery_id_table);
+#endif
+
+static const struct power_supply_desc cpcap_charger_battery_desc = {
+ .name = "battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = cpcap_battery_props,
+ .num_properties = ARRAY_SIZE(cpcap_battery_props),
+ .get_property = cpcap_battery_get_property,
+ .set_property = cpcap_battery_set_property,
+ .property_is_writeable = cpcap_battery_property_is_writeable,
+ .external_power_changed = cpcap_battery_external_power_changed,
+};
+
+static int cpcap_battery_probe(struct platform_device *pdev)
+{
+ struct cpcap_battery_ddata *ddata;
+ struct power_supply_config psy_cfg = {};
+ int error;
+
+ ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+ if (!ddata)
+ return -ENOMEM;
+
+ cpcap_battery_detect_battery_type(ddata);
+
+ INIT_LIST_HEAD(&ddata->irq_list);
+ ddata->dev = &pdev->dev;
+
+ ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
+ if (!ddata->reg)
+ return -ENODEV;
+
+ error = cpcap_get_vendor(ddata->dev, ddata->reg, &ddata->vendor);
+ if (error)
+ return error;
+
+ switch (ddata->vendor) {
+ case CPCAP_VENDOR_ST:
+ ddata->cc_lsb = 95374; /* μAms per LSB */
+ break;
+ case CPCAP_VENDOR_TI:
+ ddata->cc_lsb = 91501; /* μAms per LSB */
+ break;
+ default:
+ return -EINVAL;
+ }
+ ddata->cc_lsb = (ddata->cc_lsb * ddata->config.cd_factor) / 1000;
+
+ platform_set_drvdata(pdev, ddata);
+
+ error = cpcap_battery_init_interrupts(pdev, ddata);
+ if (error)
+ return error;
+
+ error = cpcap_battery_init_iio(ddata);
+ if (error)
+ return error;
+
+ psy_cfg.of_node = pdev->dev.of_node;
+ psy_cfg.drv_data = ddata;
+
+ ddata->psy = devm_power_supply_register(ddata->dev,
+ &cpcap_charger_battery_desc,
+ &psy_cfg);
+ error = PTR_ERR_OR_ZERO(ddata->psy);
+ if (error) {
+ dev_err(ddata->dev, "failed to register power supply\n");
+ return error;
+ }
+
+ atomic_set(&ddata->active, 1);
+
+ error = cpcap_battery_calibrate(ddata);
+ if (error)
+ return error;
+
+ return 0;
+}
+
+static int cpcap_battery_remove(struct platform_device *pdev)
+{
+ struct cpcap_battery_ddata *ddata = platform_get_drvdata(pdev);
+ int error;
+
+ atomic_set(&ddata->active, 0);
+ error = regmap_update_bits(ddata->reg, CPCAP_REG_BPEOL,
+ 0xffff, 0);
+ if (error)
+ dev_err(&pdev->dev, "could not disable: %i\n", error);
+
+ return 0;
+}
+
+static struct platform_driver cpcap_battery_driver = {
+ .driver = {
+ .name = "cpcap_battery",
+ .of_match_table = of_match_ptr(cpcap_battery_id_table),
+ },
+ .probe = cpcap_battery_probe,
+ .remove = cpcap_battery_remove,
+};
+module_platform_driver(cpcap_battery_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
+MODULE_DESCRIPTION("CPCAP PMIC Battery Driver");