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linux/drivers/power/supply/cpcap-battery.c
Uwe Kleine-König 02fecba679 power: supply: cpcap-battery: Convert to platform remove callback returning void 
The .remove() callback for a platform driver returns an int which makes
many driver authors wrongly assume it's possible to do error handling by
returning an error code. However the value returned is ignored (apart
from emitting a warning) and this typically results in resource leaks.
To improve here there is a quest to make the remove callback return
void. In the first step of this quest all drivers are converted to
.remove_new() which already returns void. Eventually after all drivers
are converted, .remove_new() is renamed to .remove().

Trivially convert this driver from always returning zero in the remove
callback to the void returning variant.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20230918133700.1254499-9-u.kleine-koenig@pengutronix.de
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
2023-09-18 20:08:02 +02:00

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// 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.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 void 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);
}
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_new = 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");
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