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M7350/kernel/drivers/power/pm8921-bms.c
T f9cc65cfda M7350v1_en_gpl
2024-09-09 08:52:07 +00:00

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/* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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.
*
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/power_supply.h>
#include <linux/mfd/pm8xxx/pm8921-bms.h>
#include <linux/mfd/pm8xxx/core.h>
#include <linux/mfd/pm8xxx/pm8xxx-adc.h>
#include <linux/mfd/pm8xxx/pm8921-charger.h>
#include <linux/mfd/pm8xxx/ccadc.h>
#include <linux/mfd/pm8xxx/batterydata-lib.h>
#include <linux/mfd/pm8xxx/batt-alarm.h>
#include <linux/interrupt.h>
#include <linux/bitops.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <linux/rtc.h>
#define BMS_CONTROL 0x224
#define BMS_S1_DELAY 0x225
#define BMS_OUTPUT0 0x230
#define BMS_OUTPUT1 0x231
#define BMS_TOLERANCES 0x232
#define BMS_TEST1 0x237
#define ADC_ARB_SECP_CNTRL 0x190
#define ADC_ARB_SECP_AMUX_CNTRL 0x191
#define ADC_ARB_SECP_ANA_PARAM 0x192
#define ADC_ARB_SECP_DIG_PARAM 0x193
#define ADC_ARB_SECP_RSV 0x194
#define ADC_ARB_SECP_DATA1 0x195
#define ADC_ARB_SECP_DATA0 0x196
#define ADC_ARB_BMS_CNTRL 0x18D
#define AMUX_TRIM_2 0x322
#define TEST_PROGRAM_REV 0x339
#define TEMP_SOC_STORAGE 0x107
#define TEMP_IAVG_STORAGE 0x105
#define TEMP_IAVG_STORAGE_USE_MASK 0x0F
#define PON_CNTRL_6 0x018
#define WD_BIT BIT(7)
#define BATT_ALARM_ACCURACY 50 /* 50mV */
enum pmic_bms_interrupts {
PM8921_BMS_SBI_WRITE_OK,
PM8921_BMS_CC_THR,
PM8921_BMS_VSENSE_THR,
PM8921_BMS_VSENSE_FOR_R,
PM8921_BMS_OCV_FOR_R,
PM8921_BMS_GOOD_OCV,
PM8921_BMS_VSENSE_AVG,
PM_BMS_MAX_INTS,
};
struct pm8921_soc_params {
uint16_t last_good_ocv_raw;
int cc;
int last_good_ocv_uv;
};
struct fcc_data {
int fcc_new;
int chargecycles;
int batt_temp;
int fcc_real;
int temp_real;
};
/**
* struct pm8921_bms_chip -
* @bms_output_lock: lock to prevent concurrent bms reads
*
* @last_ocv_uv_mutex: mutex to protect simultaneous invocations of calculate
* state of charge, note that last_ocv_uv could be
* changed as soc is adjusted. This mutex protects
* simultaneous updates of last_ocv_uv as well. This mutex
* also protects changes to *_at_100 variables used in
* faking 100% SOC.
*/
struct pm8921_bms_chip {
struct device *dev;
struct dentry *dent;
int r_sense_uohm;
unsigned int v_cutoff;
unsigned int fcc;
struct single_row_lut *fcc_temp_lut;
struct single_row_lut *fcc_sf_lut;
struct pc_temp_ocv_lut *pc_temp_ocv_lut;
struct sf_lut *pc_sf_lut;
struct sf_lut *rbatt_sf_lut;
int delta_rbatt_mohm;
struct work_struct calib_hkadc_work;
unsigned long last_calib_time;
int last_calib_temp;
struct mutex calib_mutex;
unsigned int revision;
unsigned int xoadc_v0625_usb_present;
unsigned int xoadc_v0625_usb_absent;
unsigned int xoadc_v0625;
unsigned int xoadc_v125;
unsigned int batt_temp_channel;
unsigned int vbat_channel;
unsigned int ref625mv_channel;
unsigned int ref1p25v_channel;
unsigned int batt_id_channel;
unsigned int pmic_bms_irq[PM_BMS_MAX_INTS];
DECLARE_BITMAP(enabled_irqs, PM_BMS_MAX_INTS);
struct mutex bms_output_lock;
struct single_row_lut *adjusted_fcc_temp_lut;
unsigned int charging_began;
unsigned int start_percent;
unsigned int end_percent;
unsigned int alarm_low_mv;
unsigned int alarm_high_mv;
int charge_time_us;
int catch_up_time_us;
enum battery_type batt_type;
uint16_t ocv_reading_at_100;
int max_voltage_uv;
int chg_term_ua;
int default_rbatt_mohm;
int amux_2_trim_delta;
uint16_t prev_last_good_ocv_raw;
int rconn_mohm;
int rbatt_capacitive_mohm;
struct mutex last_ocv_uv_mutex;
int last_ocv_uv;
int last_ocv_temp_decidegc;
int pon_ocv_uv;
int last_cc_uah;
unsigned long tm_sec;
int enable_fcc_learning;
int min_fcc_learning_soc;
int min_fcc_ocv_pc;
int max_fcc_learning_samples;
struct fcc_data *fcc_table;
int fcc_new;
int start_real_soc;
int pc_at_start_charge;
int shutdown_soc;
int shutdown_iavg_ua;
struct delayed_work calculate_soc_delayed_work;
struct timespec t_soc_queried;
unsigned long last_recalc_time;
int shutdown_soc_valid_limit;
int ignore_shutdown_soc;
int prev_iavg_ua;
int prev_uuc_iavg_ma;
int prev_pc_unusable;
int adjust_soc_low_threshold;
int ibat_at_cv_ua;
int soc_at_cv;
int prev_chg_soc;
struct power_supply *batt_psy;
struct wake_lock low_voltage_wake_lock;
int soc_calc_period;
int normal_voltage_calc_ms;
int low_voltage_calc_ms;
int imax_ua;
struct wake_lock soc_wake_lock;
int disable_flat_portion_ocv;
int ocv_dis_high_soc;
int ocv_dis_low_soc;
int high_ocv_correction_limit_uv;
int low_ocv_correction_limit_uv;
int hold_soc_est;
int prev_vbat_batt_terminal_uv;
int vbatt_cutoff_count;
int low_voltage_detect;
int vbatt_cutoff_retries;
bool first_report_after_suspend;
bool soc_updated_on_resume;
int last_soc_at_suspend;
};
/*
* protects against simultaneous adjustment of ocv based on shutdown soc and
* invalidating the shutdown soc
*/
static DEFINE_MUTEX(soc_invalidation_mutex);
static int shutdown_soc_invalid;
static struct pm8921_bms_chip *the_chip;
#define DEFAULT_RBATT_MOHMS 128
#define DEFAULT_OCV_MICROVOLTS 3900000
#define DEFAULT_CHARGE_CYCLES 0
#define DELTA_FCC_PERCENT 5
#define MIN_START_PERCENT_FOR_LEARNING 20
#define MIN_START_OCV_PERCENT_FOR_LEARNING 30
#define MAX_FCC_LEARNING_COUNT 5
#define VALID_FCC_CHGCYL_RANGE 50
static int last_usb_cal_delta_uv = 1800;
module_param(last_usb_cal_delta_uv, int, 0644);
static int last_chargecycles = DEFAULT_CHARGE_CYCLES;
static int last_charge_increase;
static int last_fcc_update_count;
static int max_fcc_cycles = -EINVAL;
module_param(last_chargecycles, int, 0644);
module_param(last_charge_increase, int, 0644);
module_param(last_fcc_update_count, int, 0644);
static int calculated_soc = -EINVAL;
static int last_soc = -EINVAL;
static int last_real_fcc_mah = -EINVAL;
static int last_real_fcc_batt_temp = -EINVAL;
static int battery_removed;
static int pm8921_battery_gauge_alarm_notify(struct notifier_block *nb,
unsigned long status, void *unused);
static struct notifier_block alarm_notifier = {
.notifier_call = pm8921_battery_gauge_alarm_notify,
};
static int bms_ro_ops_set(const char *val, const struct kernel_param *kp)
{
return -EINVAL;
}
static struct kernel_param_ops bms_param_ops = {
.set = bms_ro_ops_set,
.get = param_get_int,
};
/* Make last_soc as read only as it is already calculated from shutdown_soc */
module_param_cb(last_soc, &bms_param_ops, &last_soc, 0644);
module_param_cb(battery_removed, &bms_param_ops, &battery_removed, 0644);
module_param_cb(max_fcc_cycles, &bms_param_ops,
&max_fcc_cycles, 0644);
/*
* bms_fake_battery is set in setups where a battery emulator is used instead
* of a real battery. This makes the bms driver report a different/fake value
* regardless of the calculated state of charge.
*/
static int bms_fake_battery = -EINVAL;
module_param(bms_fake_battery, int, 0644);
/* bms_start_XXX and bms_end_XXX are read only */
static int bms_start_percent;
static int bms_start_ocv_uv;
static int bms_start_cc_uah;
static int bms_end_percent;
static int bms_end_ocv_uv;
static int bms_end_cc_uah;
static struct kernel_param_ops bms_ro_param_ops = {
.set = bms_ro_ops_set,
.get = param_get_int,
};
module_param_cb(bms_start_percent, &bms_ro_param_ops, &bms_start_percent, 0644);
module_param_cb(bms_start_ocv_uv, &bms_ro_param_ops, &bms_start_ocv_uv, 0644);
module_param_cb(bms_start_cc_uah, &bms_ro_param_ops, &bms_start_cc_uah, 0644);
module_param_cb(bms_end_percent, &bms_ro_param_ops, &bms_end_percent, 0644);
module_param_cb(bms_end_ocv_uv, &bms_ro_param_ops, &bms_end_ocv_uv, 0644);
module_param_cb(bms_end_cc_uah, &bms_ro_param_ops, &bms_end_cc_uah, 0644);
static void readjust_fcc_table(void)
{
struct single_row_lut *temp, *old;
int i, fcc, ratio;
if (!the_chip->enable_fcc_learning || battery_removed)
return;
if (!the_chip->fcc_temp_lut) {
pr_err("The static fcc lut table is NULL\n");
return;
}
temp = kzalloc(sizeof(struct single_row_lut), GFP_KERNEL);
if (!temp) {
pr_err("Cannot allocate memory for adjusted fcc table\n");
return;
}
fcc = interpolate_fcc(the_chip->fcc_temp_lut, last_real_fcc_batt_temp);
temp->cols = the_chip->fcc_temp_lut->cols;
for (i = 0; i < the_chip->fcc_temp_lut->cols; i++) {
temp->x[i] = the_chip->fcc_temp_lut->x[i];
ratio = div_u64(the_chip->fcc_temp_lut->y[i] * 1000, fcc);
temp->y[i] = (ratio * last_real_fcc_mah);
temp->y[i] /= 1000;
pr_debug("temp=%d, staticfcc=%d, adjfcc=%d, ratio=%d\n",
temp->x[i], the_chip->fcc_temp_lut->y[i],
temp->y[i], ratio);
}
old = the_chip->adjusted_fcc_temp_lut;
the_chip->adjusted_fcc_temp_lut = temp;
kfree(old);
}
static int bms_last_real_fcc_set(const char *val,
const struct kernel_param *kp)
{
int rc = 0;
if (battery_removed)
return rc;
if (last_real_fcc_mah == -EINVAL)
rc = param_set_int(val, kp);
if (rc) {
pr_err("Failed to set last_real_fcc_mah rc=%d\n", rc);
return rc;
}
if (last_real_fcc_batt_temp != -EINVAL)
readjust_fcc_table();
return rc;
}
static struct kernel_param_ops bms_last_real_fcc_param_ops = {
.set = bms_last_real_fcc_set,
.get = param_get_int,
};
module_param_cb(last_real_fcc_mah, &bms_last_real_fcc_param_ops,
&last_real_fcc_mah, 0644);
static int bms_last_real_fcc_batt_temp_set(const char *val,
const struct kernel_param *kp)
{
int rc = 0;
if (battery_removed)
return rc;
if (last_real_fcc_batt_temp == -EINVAL)
rc = param_set_int(val, kp);
if (rc) {
pr_err("Failed to set last_real_fcc_batt_temp rc=%d\n", rc);
return rc;
}
if (last_real_fcc_mah != -EINVAL)
readjust_fcc_table();
return rc;
}
static struct kernel_param_ops bms_last_real_fcc_batt_temp_param_ops = {
.set = bms_last_real_fcc_batt_temp_set,
.get = param_get_int,
};
module_param_cb(last_real_fcc_batt_temp, &bms_last_real_fcc_batt_temp_param_ops,
&last_real_fcc_batt_temp, 0644);
static int pm_bms_get_rt_status(struct pm8921_bms_chip *chip, int irq_id)
{
return pm8xxx_read_irq_stat(chip->dev->parent,
chip->pmic_bms_irq[irq_id]);
}
static void pm8921_bms_enable_irq(struct pm8921_bms_chip *chip, int interrupt)
{
if (!__test_and_set_bit(interrupt, chip->enabled_irqs)) {
dev_dbg(chip->dev, "%s %d\n", __func__,
chip->pmic_bms_irq[interrupt]);
enable_irq(chip->pmic_bms_irq[interrupt]);
}
}
static void pm8921_bms_disable_irq(struct pm8921_bms_chip *chip, int interrupt)
{
if (__test_and_clear_bit(interrupt, chip->enabled_irqs)) {
pr_debug("%d\n", chip->pmic_bms_irq[interrupt]);
disable_irq_nosync(chip->pmic_bms_irq[interrupt]);
}
}
static int pm_bms_masked_write(struct pm8921_bms_chip *chip, u16 addr,
u8 mask, u8 val)
{
int rc;
u8 reg;
rc = pm8xxx_readb(chip->dev->parent, addr, &reg);
if (rc) {
pr_err("read failed addr = %03X, rc = %d\n", addr, rc);
return rc;
}
reg &= ~mask;
reg |= val & mask;
rc = pm8xxx_writeb(chip->dev->parent, addr, reg);
if (rc) {
pr_err("write failed addr = %03X, rc = %d\n", addr, rc);
return rc;
}
return 0;
}
static int usb_chg_plugged_in(struct pm8921_bms_chip *chip)
{
int val = pm8921_is_usb_chg_plugged_in();
/* if the charger driver was not initialized, use the restart reason */
if (val == -EINVAL) {
if (pm8xxx_restart_reason(chip->dev->parent)
== PM8XXX_RESTART_CHG)
val = 1;
else
val = 0;
}
return val;
}
static void pm8921_bms_low_voltage_config(struct pm8921_bms_chip *chip,
int time_ms)
{
int ms = 0;
/* if work was pending and was cancelled, calculate SOC immediately */
if (!cancel_delayed_work_sync(&chip->calculate_soc_delayed_work))
ms = time_ms;
chip->soc_calc_period = time_ms;
schedule_delayed_work(&chip->calculate_soc_delayed_work,
msecs_to_jiffies(ms));
}
static int pm8921_bms_enable_batt_alarm(struct pm8921_bms_chip *chip)
{
int rc = 0;
rc = pm8xxx_batt_alarm_enable(PM8XXX_BATT_ALARM_LOWER_COMPARATOR);
if (!rc)
rc = pm8xxx_batt_alarm_disable(
PM8XXX_BATT_ALARM_UPPER_COMPARATOR);
if (rc) {
pr_err("unable to set batt alarm state rc=%d\n", rc);
return rc;
}
return rc;
}
static int pm8921_bms_configure_batt_alarm(struct pm8921_bms_chip *chip)
{
int rc = 0;
rc = pm8xxx_batt_alarm_disable(PM8XXX_BATT_ALARM_UPPER_COMPARATOR);
if (!rc)
rc = pm8xxx_batt_alarm_disable(
PM8XXX_BATT_ALARM_LOWER_COMPARATOR);
if (rc) {
pr_err("unable to set batt alarm state rc=%d\n", rc);
return rc;
}
/*
* The batt-alarm driver requires sane values for both min / max,
* regardless of whether they're both activated.
*/
rc = pm8xxx_batt_alarm_threshold_set(
PM8XXX_BATT_ALARM_LOWER_COMPARATOR,
chip->alarm_low_mv);
if (!rc)
rc = pm8xxx_batt_alarm_threshold_set(
PM8XXX_BATT_ALARM_UPPER_COMPARATOR,
chip->alarm_high_mv);
if (rc) {
pr_err("unable to set batt alarm threshold rc=%d\n", rc);
return rc;
}
rc = pm8xxx_batt_alarm_hold_time_set(
PM8XXX_BATT_ALARM_HOLD_TIME_16_MS);
if (rc) {
pr_err("unable to set batt alarm hold time rc=%d\n", rc);
return rc;
}
/* PWM enabled at 2Hz */
rc = pm8xxx_batt_alarm_pwm_rate_set(1, 7, 4);
if (rc) {
pr_err("unable to set batt alarm pwm rate rc=%d\n", rc);
return rc;
}
rc = pm8xxx_batt_alarm_register_notifier(&alarm_notifier);
if (rc) {
pr_err("unable to register alarm notifier rc=%d\n", rc);
return rc;
}
return rc;
}
static int pm8921_battery_gauge_alarm_notify(struct notifier_block *nb,
unsigned long status, void *unused)
{
int rc;
if (!the_chip) {
pr_err("not initialized\n");
return -EINVAL;
}
switch (status) {
case 0:
pr_debug("spurious interrupt\n");
break;
case 1:
pr_debug("Low voltage alarm triggered\n");
/*
* hold the low voltage wakelock until the soc
* work finds it appropriate to release it.
*/
if (!wake_lock_active(&the_chip->low_voltage_wake_lock)) {
pr_debug("Holding low voltage wakelock\n");
wake_lock(&the_chip->low_voltage_wake_lock);
pm8921_bms_low_voltage_config(the_chip,
the_chip->low_voltage_calc_ms);
}
rc = pm8xxx_batt_alarm_disable(
PM8XXX_BATT_ALARM_LOWER_COMPARATOR);
if (!rc)
rc = pm8xxx_batt_alarm_enable(
PM8XXX_BATT_ALARM_UPPER_COMPARATOR);
if (rc)
pr_err("unable to set alarm state rc=%d\n", rc);
break;
case 2:
rc = pm8xxx_batt_alarm_disable(
PM8XXX_BATT_ALARM_UPPER_COMPARATOR);
if (!rc)
rc = pm8xxx_batt_alarm_enable(
PM8XXX_BATT_ALARM_LOWER_COMPARATOR);
if (rc)
pr_err("unable to set alarm state rc=%d\n", rc);
break;
default:
pr_err("error received\n");
break;
}
return 0;
};
#define HOLD_OREG_DATA BIT(1)
static int pm_bms_lock_output_data(struct pm8921_bms_chip *chip)
{
int rc;
rc = pm_bms_masked_write(chip, BMS_CONTROL, HOLD_OREG_DATA,
HOLD_OREG_DATA);
if (rc) {
pr_err("couldnt lock bms output rc = %d\n", rc);
return rc;
}
return 0;
}
static int pm_bms_unlock_output_data(struct pm8921_bms_chip *chip)
{
int rc;
rc = pm_bms_masked_write(chip, BMS_CONTROL, HOLD_OREG_DATA, 0);
if (rc) {
pr_err("fail to unlock BMS_CONTROL rc = %d\n", rc);
return rc;
}
return 0;
}
#define SELECT_OUTPUT_DATA 0x1C
#define SELECT_OUTPUT_TYPE_SHIFT 2
#define OCV_FOR_RBATT 0x0
#define VSENSE_FOR_RBATT 0x1
#define VBATT_FOR_RBATT 0x2
#define CC_MSB 0x3
#define CC_LSB 0x4
#define LAST_GOOD_OCV_VALUE 0x5
#define VSENSE_AVG 0x6
#define VBATT_AVG 0x7
static int pm_bms_read_output_data(struct pm8921_bms_chip *chip, int type,
int16_t *result)
{
int rc;
u8 reg;
if (!result) {
pr_err("result pointer null\n");
return -EINVAL;
}
*result = 0;
if (type < OCV_FOR_RBATT || type > VBATT_AVG) {
pr_err("invalid type %d asked to read\n", type);
return -EINVAL;
}
rc = pm_bms_masked_write(chip, BMS_CONTROL, SELECT_OUTPUT_DATA,
type << SELECT_OUTPUT_TYPE_SHIFT);
if (rc) {
pr_err("fail to select %d type in BMS_CONTROL rc = %d\n",
type, rc);
return rc;
}
rc = pm8xxx_readb(chip->dev->parent, BMS_OUTPUT0, &reg);
if (rc) {
pr_err("fail to read BMS_OUTPUT0 for type %d rc = %d\n",
type, rc);
return rc;
}
*result = reg;
rc = pm8xxx_readb(chip->dev->parent, BMS_OUTPUT1, &reg);
if (rc) {
pr_err("fail to read BMS_OUTPUT1 for type %d rc = %d\n",
type, rc);
return rc;
}
*result |= reg << 8;
pr_debug("type %d result %x", type, *result);
return 0;
}
#define V_PER_BIT_MUL_FACTOR 97656
#define V_PER_BIT_DIV_FACTOR 1000
#define XOADC_INTRINSIC_OFFSET 0x6000
static int xoadc_reading_to_microvolt(unsigned int a)
{
if (a <= XOADC_INTRINSIC_OFFSET)
return 0;
return (a - XOADC_INTRINSIC_OFFSET)
* V_PER_BIT_MUL_FACTOR / V_PER_BIT_DIV_FACTOR;
}
#define XOADC_CALIB_UV 625000
#define VBATT_MUL_FACTOR 3
static int adjust_xo_vbatt_reading(struct pm8921_bms_chip *chip,
int usb_chg, unsigned int uv)
{
s64 numerator, denominator;
int local_delta;
if (uv == 0)
return 0;
/* dont adjust if not calibrated */
if (chip->xoadc_v0625 == 0 || chip->xoadc_v125 == 0) {
pr_debug("No cal yet return %d\n", VBATT_MUL_FACTOR * uv);
return VBATT_MUL_FACTOR * uv;
}
if (usb_chg)
local_delta = last_usb_cal_delta_uv;
else
local_delta = 0;
pr_debug("using delta = %d\n", local_delta);
numerator = ((s64)uv - chip->xoadc_v0625 - local_delta)
* XOADC_CALIB_UV;
denominator = (s64)chip->xoadc_v125 - chip->xoadc_v0625 - local_delta;
if (denominator == 0)
return uv * VBATT_MUL_FACTOR;
return (XOADC_CALIB_UV + local_delta + div_s64(numerator, denominator))
* VBATT_MUL_FACTOR;
}
#define CC_RESOLUTION_N 868056
#define CC_RESOLUTION_D 10000
static s64 cc_to_microvolt(struct pm8921_bms_chip *chip, s64 cc)
{
return div_s64(cc * CC_RESOLUTION_N, CC_RESOLUTION_D);
}
#define CC_READING_TICKS 56
#define SLEEP_CLK_HZ 32764
#define SECONDS_PER_HOUR 3600
/**
* ccmicrovolt_to_pvh -
* @cc_uv: coulumb counter converted to uV
*
* RETURNS: coulumb counter based charge in pVh
* (pico Volt Hour)
*/
static s64 ccmicrovolt_to_pvh(s64 cc_uv)
{
return div_s64(cc_uv * CC_READING_TICKS * 1000000L,
SLEEP_CLK_HZ * SECONDS_PER_HOUR);
}
/* returns the signed value read from the hardware */
static int read_cc(struct pm8921_bms_chip *chip, int *result)
{
int rc;
uint16_t msw, lsw;
*result = 0;
rc = pm_bms_read_output_data(chip, CC_LSB, &lsw);
if (rc) {
pr_err("fail to read CC_LSB rc = %d\n", rc);
return rc;
}
rc = pm_bms_read_output_data(chip, CC_MSB, &msw);
if (rc) {
pr_err("fail to read CC_MSB rc = %d\n", rc);
return rc;
}
*result = msw << 16 | lsw;
pr_debug("msw = %04x lsw = %04x cc = %d\n", msw, lsw, *result);
return 0;
}
static int adjust_xo_vbatt_reading_for_mbg(struct pm8921_bms_chip *chip,
int result)
{
int64_t numerator;
int64_t denominator;
if (chip->amux_2_trim_delta == 0)
return result;
numerator = (s64)result * 1000000;
denominator = (1000000 + (410 * (s64)chip->amux_2_trim_delta));
return div_s64(numerator, denominator);
}
static int convert_vbatt_raw_to_uv(struct pm8921_bms_chip *chip,
int usb_chg,
uint16_t reading, int *result)
{
*result = xoadc_reading_to_microvolt(reading);
pr_debug("raw = %04x vbatt = %u\n", reading, *result);
*result = adjust_xo_vbatt_reading(chip, usb_chg, *result);
pr_debug("after adj vbatt = %u\n", *result);
*result = adjust_xo_vbatt_reading_for_mbg(chip, *result);
return 0;
}
static int convert_vsense_to_uv(struct pm8921_bms_chip *chip,
int16_t reading, int *result)
{
*result = pm8xxx_ccadc_reading_to_microvolt(chip->revision, reading);
pr_debug("raw = %04x vsense = %d\n", reading, *result);
*result = pm8xxx_cc_adjust_for_gain(*result);
pr_debug("after adj vsense = %d\n", *result);
return 0;
}
static int read_vsense_avg(struct pm8921_bms_chip *chip, int *result)
{
int rc;
int16_t reading;
rc = pm_bms_read_output_data(chip, VSENSE_AVG, &reading);
if (rc) {
pr_err("fail to read VSENSE_AVG rc = %d\n", rc);
return rc;
}
convert_vsense_to_uv(chip, reading, result);
return 0;
}
static int get_batt_temp(struct pm8921_bms_chip *chip, int *batt_temp)
{
int rc;
struct pm8xxx_adc_chan_result result;
rc = pm8xxx_adc_read(chip->batt_temp_channel, &result);
if (rc) {
pr_err("error reading batt_temp_channel = %d, rc = %d\n",
chip->batt_temp_channel, rc);
return rc;
}
*batt_temp = result.physical;
pr_debug("batt_temp phy = %lld meas = 0x%llx\n", result.physical,
result.measurement);
return 0;
}
#define BMS_MODE_BIT BIT(6)
#define EN_VBAT_BIT BIT(5)
#define OVERRIDE_MODE_DELAY_MS 20
int override_mode_simultaneous_battery_voltage_and_current(int *ibat_ua,
int *vbat_uv)
{
int16_t vsense_raw;
int16_t vbat_raw;
int vsense_uv;
int usb_chg;
int batt_temp;
mutex_lock(&the_chip->bms_output_lock);
pm8xxx_writeb(the_chip->dev->parent, BMS_S1_DELAY, 0x00);
pm_bms_masked_write(the_chip, BMS_CONTROL,
BMS_MODE_BIT | EN_VBAT_BIT, BMS_MODE_BIT | EN_VBAT_BIT);
msleep(OVERRIDE_MODE_DELAY_MS);
pm_bms_lock_output_data(the_chip);
pm_bms_read_output_data(the_chip, VSENSE_AVG, &vsense_raw);
pm_bms_read_output_data(the_chip, VBATT_AVG, &vbat_raw);
pm_bms_unlock_output_data(the_chip);
pm_bms_masked_write(the_chip, BMS_CONTROL,
BMS_MODE_BIT | EN_VBAT_BIT, 0);
pm8xxx_writeb(the_chip->dev->parent, BMS_S1_DELAY, 0x0B);
mutex_unlock(&the_chip->bms_output_lock);
get_batt_temp(the_chip, &batt_temp);
usb_chg = usb_chg_plugged_in(the_chip);
convert_vbatt_raw_to_uv(the_chip, usb_chg, vbat_raw, vbat_uv);
convert_vsense_to_uv(the_chip, vsense_raw, &vsense_uv);
*ibat_ua = div_s64((s64)vsense_uv * 1000000LL, the_chip->r_sense_uohm);
pr_debug("vsense_raw = 0x%x vbat_raw = 0x%x"
" ibat_ua = %d vbat_uv = %d\n",
(uint16_t)vsense_raw, (uint16_t)vbat_raw,
*ibat_ua, *vbat_uv);
return 0;
}
#define MBG_TRANSIENT_ERROR_UV 15000
static void adjust_pon_ocv(struct pm8921_bms_chip *chip, int *uv)
{
/*
* In 8921 parts the PON ocv is taken when the MBG is not settled.
* decrease the pon ocv by 15mV raw value to account for it
* Since a 1/3rd of vbatt is supplied to the adc the raw value
* needs to be adjusted by 5mV worth bits
*/
if (*uv >= MBG_TRANSIENT_ERROR_UV)
*uv -= MBG_TRANSIENT_ERROR_UV;
}
#define SEL_ALT_OREG_BIT BIT(2)
static int ocv_ir_compensation(struct pm8921_bms_chip *chip, int ocv)
{
int compensated_ocv;
int ibatt_ua;
int rbatt_mohm = chip->default_rbatt_mohm + chip->rconn_mohm;
pm_bms_masked_write(chip, BMS_TEST1,
SEL_ALT_OREG_BIT, SEL_ALT_OREG_BIT);
/* since the SEL_ALT_OREG_BIT is set this will give us VSENSE_OCV */
pm8921_bms_get_battery_current(&ibatt_ua);
compensated_ocv = ocv + div_s64((s64)ibatt_ua * rbatt_mohm, 1000);
pr_debug("comp ocv = %d, ocv = %d, ibatt_ua = %d, rbatt_mohm = %d\n",
compensated_ocv, ocv, ibatt_ua, rbatt_mohm);
pm_bms_masked_write(chip, BMS_TEST1, SEL_ALT_OREG_BIT, 0);
return compensated_ocv;
}
#define RESET_CC_BIT BIT(3)
static int reset_cc(struct pm8921_bms_chip *chip)
{
int rc;
rc = pm_bms_masked_write(chip, BMS_TEST1, RESET_CC_BIT, RESET_CC_BIT);
if (rc < 0) {
pr_err("err setting cc reset rc = %d\n", rc);
return rc;
}
/* sleep 100uS for the coulomb counter to reset */
udelay(100);
rc = pm_bms_masked_write(chip, BMS_TEST1, RESET_CC_BIT, 0);
if (rc < 0)
pr_err("err clearing cc reset rc = %d\n", rc);
return rc;
}
static int estimate_ocv(struct pm8921_bms_chip *chip)
{
int ibat_ua, vbat_uv, ocv_est_uv;
int rc;
int rbatt_mohm = chip->default_rbatt_mohm + chip->rconn_mohm
+ chip->rbatt_capacitive_mohm;
rc = pm8921_bms_get_simultaneous_battery_voltage_and_current(
&ibat_ua,
&vbat_uv);
if (rc) {
pr_err("simultaneous failed rc = %d\n", rc);
return rc;
}
ocv_est_uv = vbat_uv + (ibat_ua * rbatt_mohm) / 1000;
pr_debug("estimated pon ocv = %d\n", ocv_est_uv);
return ocv_est_uv;
}
static bool is_warm_restart(struct pm8921_bms_chip *chip)
{
u8 reg;
int rc;
rc = pm8xxx_readb(chip->dev->parent, PON_CNTRL_6, &reg);
if (rc) {
pr_err("err reading pon 6 rc = %d\n", rc);
return false;
}
return reg & WD_BIT;
}
#define IBAT_TOL_MASK 0x0F
#define OCV_TOL_MASK 0xF0
#define IBAT_TOL_DEFAULT 0x03
#define IBAT_TOL_NOCHG 0x0F
#define OCV_TOL_DEFAULT 0x20
#define OCV_TOL_NO_OCV 0x00
static int pm8921_bms_stop_ocv_updates(void)
{
if (!the_chip) {
pr_err("BMS driver has not been initialized yet!\n");
return -EINVAL;
}
pr_debug("stopping ocv updates\n");
return pm_bms_masked_write(the_chip, BMS_TOLERANCES,
OCV_TOL_MASK, OCV_TOL_NO_OCV);
}
static int pm8921_bms_start_ocv_updates(void)
{
if (!the_chip) {
pr_err("BMS driver has not been initialized yet!\n");
return -EINVAL;
}
pr_debug("starting ocv updates\n");
return pm_bms_masked_write(the_chip, BMS_TOLERANCES,
OCV_TOL_MASK, OCV_TOL_DEFAULT);
}
static int reset_bms_for_test(void)
{
int ibat_ua, vbat_uv, rc;
int ocv_est_uv;
if (!the_chip) {
pr_err("BMS driver has not been initialized yet!\n");
return -EINVAL;
}
rc = pm8921_bms_get_simultaneous_battery_voltage_and_current(
&ibat_ua,
&vbat_uv);
/*
* don't include rbatt and rbatt_capacitve since we expect this to
* be used with a fake battery which does not have internal resistnaces
*/
ocv_est_uv = vbat_uv + (ibat_ua * the_chip->rconn_mohm) / 1000;
pr_debug("forcing ocv to be %d due to bms reset mode\n", ocv_est_uv);
the_chip->last_ocv_uv = ocv_est_uv;
last_soc = -EINVAL;
reset_cc(the_chip);
the_chip->last_cc_uah = 0;
pm8921_bms_stop_ocv_updates();
pr_debug("bms reset to ocv = %duv vbat_ua = %d ibat_ua = %d\n",
the_chip->last_ocv_uv, vbat_uv, ibat_ua);
return rc;
}
static int bms_reset_set(const char *val, const struct kernel_param *kp)
{
int rc;
rc = param_set_bool(val, kp);
if (rc) {
pr_err("Unable to set bms_reset: %d\n", rc);
return rc;
}
if (*val == 'Y') {
rc = reset_bms_for_test();
if (rc) {
pr_err("Unable to modify bms_reset: %d\n", rc);
return rc;
}
}
return 0;
}
static struct kernel_param_ops bms_reset_ops = {
.set = bms_reset_set,
.get = param_get_bool,
};
static bool bms_reset;
module_param_cb(bms_reset, &bms_reset_ops, &bms_reset, 0644);
/*
* This reflects what should the CC readings should be for
* a 5mAh discharge. This value is dependent on
* CC_RESOLUTION_N, CC_RESOLUTION_D, CC_READING_TICKS
* and rsense
*/
#define CC_RAW_5MAH 0x00110000
#define MIN_OCV_UV 2000000
#define OCV_RAW_UNINITIALIZED 0xFFFF
static int read_soc_params_raw(struct pm8921_bms_chip *chip,
struct pm8921_soc_params *raw,
int batt_temp_decidegc)
{
int usb_chg;
int est_ocv_uv;
mutex_lock(&chip->bms_output_lock);
pm_bms_lock_output_data(chip);
pm_bms_read_output_data(chip,
LAST_GOOD_OCV_VALUE, &raw->last_good_ocv_raw);
read_cc(chip, &raw->cc);
pm_bms_unlock_output_data(chip);
mutex_unlock(&chip->bms_output_lock);
usb_chg = usb_chg_plugged_in(chip);
if (chip->prev_last_good_ocv_raw == OCV_RAW_UNINITIALIZED) {
chip->prev_last_good_ocv_raw = raw->last_good_ocv_raw;
convert_vbatt_raw_to_uv(chip, usb_chg,
raw->last_good_ocv_raw, &raw->last_good_ocv_uv);
adjust_pon_ocv(chip, &raw->last_good_ocv_uv);
raw->last_good_ocv_uv = ocv_ir_compensation(chip,
raw->last_good_ocv_uv);
chip->last_ocv_uv = raw->last_good_ocv_uv;
if (is_warm_restart(chip)
|| raw->cc > CC_RAW_5MAH
|| (raw->last_good_ocv_uv < MIN_OCV_UV
&& raw->cc > 0)) {
/*
* The CC value is higher than 5mAh.
* The phone started without going through a pon
* sequence
* OR
* The ocv was very small and there was no
* charging in the bootloader
* - reset the CC and take an ocv again
*/
pr_debug("cc_raw = 0x%x may be > 5mAh(0x%x)\n",
raw->cc, CC_RAW_5MAH);
pr_debug("ocv_uv = %d ocv_raw = 0x%x may be < 2V\n",
chip->last_ocv_uv,
raw->last_good_ocv_raw);
est_ocv_uv = estimate_ocv(chip);
if (est_ocv_uv > 0) {
raw->last_good_ocv_uv = est_ocv_uv;
chip->last_ocv_uv = est_ocv_uv;
reset_cc(chip);
raw->cc = 0;
}
}
chip->last_ocv_temp_decidegc = batt_temp_decidegc;
pr_debug("PON_OCV_UV = %d\n", chip->last_ocv_uv);
} else if (chip->prev_last_good_ocv_raw != raw->last_good_ocv_raw) {
chip->prev_last_good_ocv_raw = raw->last_good_ocv_raw;
convert_vbatt_raw_to_uv(chip, usb_chg,
raw->last_good_ocv_raw, &raw->last_good_ocv_uv);
chip->last_ocv_uv = raw->last_good_ocv_uv;
chip->last_ocv_temp_decidegc = batt_temp_decidegc;
/* forget the old cc value upon ocv */
chip->last_cc_uah = 0;
} else {
raw->last_good_ocv_uv = chip->last_ocv_uv;
}
/* stop faking 100% after an OCV event */
if (chip->ocv_reading_at_100 != raw->last_good_ocv_raw)
chip->ocv_reading_at_100 = OCV_RAW_UNINITIALIZED;
pr_debug("0p625 = %duV\n", chip->xoadc_v0625);
pr_debug("1p25 = %duV\n", chip->xoadc_v125);
pr_debug("last_good_ocv_raw= 0x%x, last_good_ocv_uv= %duV\n",
raw->last_good_ocv_raw, raw->last_good_ocv_uv);
pr_debug("cc_raw= 0x%x\n", raw->cc);
return 0;
}
static int get_rbatt(struct pm8921_bms_chip *chip, int soc_rbatt, int batt_temp)
{
int rbatt, scalefactor;
rbatt = chip->default_rbatt_mohm;
pr_debug("rbatt before scaling = %d\n", rbatt);
if (chip->rbatt_sf_lut == NULL) {
pr_debug("RBATT = %d\n", rbatt);
return rbatt;
}
/* Convert the batt_temp to DegC from deciDegC */
batt_temp = batt_temp / 10;
scalefactor = interpolate_scalingfactor(chip->rbatt_sf_lut,
batt_temp, soc_rbatt);
pr_debug("rbatt sf = %d for batt_temp = %d, soc_rbatt = %d\n",
scalefactor, batt_temp, soc_rbatt);
rbatt = (rbatt * scalefactor) / 100;
rbatt += the_chip->rconn_mohm;
pr_debug("adding rconn_mohm = %d rbatt = %d\n",
the_chip->rconn_mohm, rbatt);
rbatt += the_chip->rbatt_capacitive_mohm;
pr_debug("adding rbatt_capacitive_mohm = %d rbatt = %d\n",
the_chip->rbatt_capacitive_mohm, rbatt);
if (is_between(20, 10, soc_rbatt))
rbatt = rbatt
+ ((20 - soc_rbatt) * chip->delta_rbatt_mohm) / 10;
else
if (is_between(10, 0, soc_rbatt))
rbatt = rbatt + chip->delta_rbatt_mohm;
pr_debug("RBATT = %d\n", rbatt);
return rbatt;
}
static int calculate_fcc_uah(struct pm8921_bms_chip *chip, int batt_temp,
int chargecycles)
{
int initfcc, result, scalefactor = 0;
if (chip->adjusted_fcc_temp_lut == NULL) {
initfcc = interpolate_fcc(chip->fcc_temp_lut, batt_temp);
scalefactor = interpolate_scalingfactor_fcc(chip->fcc_sf_lut,
chargecycles);
/* Multiply the initial FCC value by the scale factor. */
result = (initfcc * scalefactor * 1000) / 100;
pr_debug("fcc = %d uAh\n", result);
return result;
} else {
return 1000 * interpolate_fcc(chip->adjusted_fcc_temp_lut,
batt_temp);
}
}
static int get_battery_uvolts(struct pm8921_bms_chip *chip, int *uvolts)
{
int rc;
struct pm8xxx_adc_chan_result result;
rc = pm8xxx_adc_read(chip->vbat_channel, &result);
if (rc) {
pr_err("error reading adc channel = %d, rc = %d\n",
chip->vbat_channel, rc);
return rc;
}
pr_debug("mvolts phy = %lld meas = 0x%llx", result.physical,
result.measurement);
*uvolts = (int)result.physical;
return 0;
}
static int adc_based_ocv(struct pm8921_bms_chip *chip, int *ocv)
{
int vbatt, rbatt, ibatt_ua, rc;
rc = get_battery_uvolts(chip, &vbatt);
if (rc) {
pr_err("failed to read vbatt from adc rc = %d\n", rc);
return rc;
}
rc = pm8921_bms_get_battery_current(&ibatt_ua);
if (rc) {
pr_err("failed to read batt current rc = %d\n", rc);
return rc;
}
rbatt = chip->default_rbatt_mohm;
*ocv = vbatt + (ibatt_ua * rbatt)/1000;
return 0;
}
static int calculate_pc(struct pm8921_bms_chip *chip, int ocv_uv,
int batt_temp_decidegc, int chargecycles)
{
int pc, scalefactor;
pc = interpolate_pc(chip->pc_temp_ocv_lut,
batt_temp_decidegc / 10, ocv_uv / 1000);
pr_debug("pc = %u for ocv = %dmicroVolts batt_temp = %d\n",
pc, ocv_uv, batt_temp_decidegc);
scalefactor = interpolate_scalingfactor(chip->pc_sf_lut,
chargecycles, pc);
pr_debug("scalefactor = %u batt_temp = %d\n",
scalefactor, batt_temp_decidegc);
/* Multiply the initial FCC value by the scale factor. */
pc = (pc * scalefactor) / 100;
return pc;
}
/**
* calculate_cc_uah -
* @chip: the bms chip pointer
* @cc: the cc reading from bms h/w
* @val: return value
* @coulumb_counter: adjusted coulumb counter for 100%
*
* RETURNS: in val pointer coulumb counter based charger in uAh
* (micro Amp hour)
*/
static void calculate_cc_uah(struct pm8921_bms_chip *chip, int cc, int *val)
{
int64_t cc_voltage_uv, cc_pvh, cc_uah;
cc_voltage_uv = cc;
pr_debug("cc = %d\n", cc);
cc_voltage_uv = cc_to_microvolt(chip, cc_voltage_uv);
cc_voltage_uv = pm8xxx_cc_adjust_for_gain(cc_voltage_uv);
pr_debug("cc_voltage_uv = %lld microvolts\n", cc_voltage_uv);
cc_pvh = ccmicrovolt_to_pvh(cc_voltage_uv);
pr_debug("cc_pvh = %lld pico_volt_hour\n", cc_pvh);
cc_uah = div_s64(cc_pvh, chip->r_sense_uohm);
*val = cc_uah;
}
int pm8921_bms_cc_uah(int *cc_uah)
{
int cc;
*cc_uah = 0;
if (!the_chip)
return -EINVAL;
read_cc(the_chip, &cc);
calculate_cc_uah(the_chip, cc, cc_uah);
return 0;
}
EXPORT_SYMBOL(pm8921_bms_cc_uah);
static int calculate_termination_uuc(struct pm8921_bms_chip *chip,
int batt_temp, int chargecycles,
int fcc_uah, int i_ma,
int *ret_pc_unusable)
{
int unusable_uv, pc_unusable, uuc;
int i = 0;
int ocv_mv;
int batt_temp_degc = batt_temp / 10;
int rbatt_mohm;
int delta_uv;
int prev_delta_uv = 0;
int prev_rbatt_mohm = 0;
int prev_ocv_mv = 0;
int uuc_rbatt_uv;
for (i = 0; i <= 100; i++) {
ocv_mv = interpolate_ocv(chip->pc_temp_ocv_lut,
batt_temp_degc, i);
rbatt_mohm = get_rbatt(chip, i, batt_temp);
unusable_uv = (rbatt_mohm * i_ma) + (chip->v_cutoff * 1000);
delta_uv = ocv_mv * 1000 - unusable_uv;
pr_debug("soc = %d ocv = %d rbat = %d u_uv = %d delta_v = %d\n",
i, ocv_mv, rbatt_mohm, unusable_uv, delta_uv);
if (delta_uv > 0)
break;
prev_delta_uv = delta_uv;
prev_rbatt_mohm = rbatt_mohm;
prev_ocv_mv = ocv_mv;
}
uuc_rbatt_uv = linear_interpolate(rbatt_mohm, delta_uv,
prev_rbatt_mohm, prev_delta_uv,
0);
unusable_uv = (uuc_rbatt_uv * i_ma) + (chip->v_cutoff * 1000);
pc_unusable = calculate_pc(chip, unusable_uv, batt_temp, chargecycles);
uuc = (fcc_uah * pc_unusable) / 100;
pr_debug("For i_ma = %d, unusable_rbatt = %d unusable_uv = %d unusable_pc = %d uuc = %d\n",
i_ma, uuc_rbatt_uv, unusable_uv,
pc_unusable, uuc);
*ret_pc_unusable = pc_unusable;
return uuc;
}
#define TIME_PER_PERCENT_UUC 60
static int adjust_uuc(struct pm8921_bms_chip *chip, int fcc_uah,
int new_pc_unusable,
int new_uuc,
int batt_temp,
int rbatt,
int *iavg_ma,
int delta_time_s)
{
int new_unusable_mv;
int batt_temp_degc = batt_temp / 10;
int max_percent_change;
max_percent_change = max(delta_time_s / TIME_PER_PERCENT_UUC, 1);
if (chip->prev_pc_unusable == -EINVAL
|| abs(chip->prev_pc_unusable - new_pc_unusable)
<= max_percent_change) {
chip->prev_pc_unusable = new_pc_unusable;
return new_uuc;
}
/* the uuc is trying to change more than 1% restrict it */
if (new_pc_unusable > chip->prev_pc_unusable)
chip->prev_pc_unusable += max_percent_change;
else
chip->prev_pc_unusable -= max_percent_change;
chip->prev_pc_unusable = clamp(chip->prev_pc_unusable, 0, 100);
new_uuc = (fcc_uah * chip->prev_pc_unusable) / 100;
/* also find update the iavg_ma accordingly */
new_unusable_mv = interpolate_ocv(chip->pc_temp_ocv_lut,
batt_temp_degc, chip->prev_pc_unusable);
if (new_unusable_mv < chip->v_cutoff)
new_unusable_mv = chip->v_cutoff;
*iavg_ma = (new_unusable_mv - chip->v_cutoff) * 1000 / rbatt;
if (*iavg_ma == 0)
*iavg_ma = 1;
pr_debug("Restricting UUC to %d (%d%%) unusable_mv = %d iavg_ma = %d\n",
new_uuc, chip->prev_pc_unusable,
new_unusable_mv, *iavg_ma);
return new_uuc;
}
static int get_current_time(unsigned long *now_tm_sec)
{
struct rtc_time tm;
struct rtc_device *rtc;
int rc;
rtc = rtc_class_open(CONFIG_RTC_HCTOSYS_DEVICE);
if (rtc == NULL) {
pr_err("%s: unable to open rtc device (%s)\n",
__FILE__, CONFIG_RTC_HCTOSYS_DEVICE);
return -EINVAL;
}
rc = rtc_read_time(rtc, &tm);
if (rc) {
pr_err("Error reading rtc device (%s) : %d\n",
CONFIG_RTC_HCTOSYS_DEVICE, rc);
return rc;
}
rc = rtc_valid_tm(&tm);
if (rc) {
pr_err("Invalid RTC time (%s): %d\n",
CONFIG_RTC_HCTOSYS_DEVICE, rc);
return rc;
}
rtc_tm_to_time(&tm, now_tm_sec);
return 0;
}
static int calculate_delta_time(struct pm8921_bms_chip *chip, int *delta_time_s)
{
unsigned long now_tm_sec = 0;
/* default to delta time = 0 if anything fails */
*delta_time_s = 0;
get_current_time(&now_tm_sec);
*delta_time_s = (now_tm_sec - chip->tm_sec);
pr_debug("tm_sec = %ld, now_tm_sec = %ld delta_s = %d\n",
chip->tm_sec, now_tm_sec, *delta_time_s);
/* remember this time */
chip->tm_sec = now_tm_sec;
return 0;
}
static void calculate_iavg_ua(struct pm8921_bms_chip *chip, int cc_uah,
int *iavg_ua, int delta_time_s)
{
int delta_cc_uah = 0;
/* if anything fails report the previous iavg_ua */
*iavg_ua = chip->prev_iavg_ua;
if (chip->last_cc_uah == INT_MIN) {
pm8921_bms_get_battery_current(iavg_ua);
goto out;
}
/* use the previous iavg if called within 15 seconds */
if (delta_time_s < 15) {
*iavg_ua = chip->prev_iavg_ua;
goto out;
}
delta_cc_uah = cc_uah - chip->last_cc_uah;
*iavg_ua = div_s64((s64)delta_cc_uah * 3600, delta_time_s);
out:
pr_debug("delta_cc = %d iavg_ua = %d\n", delta_cc_uah, (int)*iavg_ua);
/* remember the iavg */
chip->prev_iavg_ua = *iavg_ua;
/* remember cc_uah */
chip->last_cc_uah = cc_uah;
}
#define IAVG_SAMPLES 16
#define MIN_IAVG_MA 250
#define MIN_SECONDS_FOR_VALID_SAMPLE 20
static int calculate_unusable_charge_uah(struct pm8921_bms_chip *chip,
int rbatt, int fcc_uah, int cc_uah,
int soc_rbatt, int batt_temp, int chargecycles,
int iavg_ua, int delta_time_s)
{
int uuc_uah_iavg;
int i;
int iavg_ma = iavg_ua / 1000;
static int iavg_samples[IAVG_SAMPLES];
static int iavg_index;
static int iavg_num_samples;
static int firsttime = 1;
int pc_unusable;
/*
* if we are called first time fill all the
* samples with the the shutdown_iavg_ua
*/
if (firsttime && chip->shutdown_iavg_ua != 0) {
pr_debug("Using shutdown_iavg_ua = %d in all samples\n",
chip->shutdown_iavg_ua);
for (i = 0; i < IAVG_SAMPLES; i++)
iavg_samples[i] = chip->shutdown_iavg_ua;
iavg_index = 0;
iavg_num_samples = IAVG_SAMPLES;
}
/*
* if we are charging use a nominal avg current so that we keep
* a reasonable UUC while charging
*/
if (iavg_ma < MIN_IAVG_MA)
iavg_ma = MIN_IAVG_MA;
iavg_samples[iavg_index] = iavg_ma;
iavg_index = (iavg_index + 1) % IAVG_SAMPLES;
iavg_num_samples++;
if (iavg_num_samples >= IAVG_SAMPLES)
iavg_num_samples = IAVG_SAMPLES;
/* now that this sample is added calcualte the average */
iavg_ma = 0;
if (iavg_num_samples != 0) {
for (i = 0; i < iavg_num_samples; i++) {
pr_debug("iavg_samples[%d] = %d\n", i, iavg_samples[i]);
iavg_ma += iavg_samples[i];
}
iavg_ma = DIV_ROUND_CLOSEST(iavg_ma, iavg_num_samples);
}
/*
* if we're in bms reset mode, force uuc to be 3% of fcc
*/
if (bms_reset)
return (fcc_uah * 3) / 100;
uuc_uah_iavg = calculate_termination_uuc(chip,
batt_temp, chargecycles,
fcc_uah, iavg_ma,
&pc_unusable);
pr_debug("iavg = %d uuc_iavg = %d\n", iavg_ma, uuc_uah_iavg);
/* restrict the uuc change to one percent per 60 seconds */
uuc_uah_iavg = adjust_uuc(chip, fcc_uah, pc_unusable, uuc_uah_iavg,
batt_temp, rbatt, &iavg_ma, delta_time_s);
/* find out what the avg current should be for this uuc */
chip->prev_uuc_iavg_ma = iavg_ma;
firsttime = 0;
return uuc_uah_iavg;
}
/* calculate remainging charge at the time of ocv */
static int calculate_remaining_charge_uah(struct pm8921_bms_chip *chip,
struct pm8921_soc_params *raw,
int fcc_uah, int batt_temp,
int chargecycles)
{
int ocv, pc, batt_temp_decidegc;
ocv = raw->last_good_ocv_uv;
batt_temp_decidegc = chip->last_ocv_temp_decidegc;
pc = calculate_pc(chip, ocv, batt_temp_decidegc, chargecycles);
pr_debug("ocv = %d pc = %d\n", ocv, pc);
return (fcc_uah * pc) / 100;
}
static void calculate_soc_params(struct pm8921_bms_chip *chip,
struct pm8921_soc_params *raw,
int batt_temp, int chargecycles,
int *fcc_uah,
int *unusable_charge_uah,
int *remaining_charge_uah,
int *cc_uah,
int *rbatt,
int *iavg_ua)
{
int soc_rbatt;
int delta_time_s;
int rc;
rc = calculate_delta_time(chip, &delta_time_s);
if (rc) {
pr_err("Failed to get delta time from RTC: %d\n", rc);
delta_time_s = 0;
}
*fcc_uah = calculate_fcc_uah(chip, batt_temp, chargecycles);
pr_debug("FCC = %uuAh batt_temp = %d, cycles = %d\n",
*fcc_uah, batt_temp, chargecycles);
/* calculate remainging charge */
*remaining_charge_uah = calculate_remaining_charge_uah(chip, raw,
*fcc_uah, batt_temp, chargecycles);
pr_debug("RC = %uuAh\n", *remaining_charge_uah);
/* calculate cc micro_volt_hour */
calculate_cc_uah(chip, raw->cc, cc_uah);
pr_debug("cc_uah = %duAh raw->cc = %x\n", *cc_uah, raw->cc);
soc_rbatt = ((*remaining_charge_uah - *cc_uah) * 100) / *fcc_uah;
if (soc_rbatt < 0)
soc_rbatt = 0;
*rbatt = get_rbatt(chip, soc_rbatt, batt_temp);
calculate_iavg_ua(chip, *cc_uah, iavg_ua, delta_time_s);
*unusable_charge_uah = calculate_unusable_charge_uah(chip, *rbatt,
*fcc_uah, *cc_uah, soc_rbatt,
batt_temp, chargecycles, *iavg_ua,
delta_time_s);
pr_debug("UUC = %uuAh\n", *unusable_charge_uah);
}
int pm8921_bms_get_simultaneous_battery_voltage_and_current(int *ibat_ua,
int *vbat_uv)
{
int rc;
if (the_chip == NULL) {
pr_err("Called too early\n");
return -EINVAL;
}
if (pm8921_is_batfet_closed()) {
return override_mode_simultaneous_battery_voltage_and_current(
ibat_ua,
vbat_uv);
} else {
pr_debug("batfet is open using separate vbat and ibat meas\n");
rc = get_battery_uvolts(the_chip, vbat_uv);
if (rc < 0) {
pr_err("adc vbat failed err = %d\n", rc);
return rc;
}
rc = pm8921_bms_get_battery_current(ibat_ua);
if (rc < 0) {
pr_err("bms ibat failed err = %d\n", rc);
return rc;
}
}
return 0;
}
EXPORT_SYMBOL(pm8921_bms_get_simultaneous_battery_voltage_and_current);
#define SIGN(x) ((x) < 0 ? -1 : 1)
static void find_ocv_for_soc(struct pm8921_bms_chip *chip,
int batt_temp,
int chargecycles,
int fcc_uah,
int uuc_uah,
int cc_uah,
int shutdown_soc,
int *rc_uah,
int *ocv_uv)
{
s64 rc;
int pc, new_pc;
int batt_temp_degc = batt_temp / 10;
int ocv;
rc = (s64)shutdown_soc * (fcc_uah - uuc_uah);
rc = div_s64(rc, 100) + cc_uah + uuc_uah;
pc = DIV_ROUND_CLOSEST((int)rc * 100, fcc_uah);
pc = clamp(pc, 0, 100);
ocv = interpolate_ocv(chip->pc_temp_ocv_lut, batt_temp_degc, pc);
pr_debug("s_soc = %d, fcc = %d uuc = %d rc = %d, pc = %d, ocv mv = %d\n",
shutdown_soc, fcc_uah, uuc_uah, (int)rc, pc, ocv);
new_pc = interpolate_pc(chip->pc_temp_ocv_lut, batt_temp_degc, ocv);
pr_debug("test revlookup pc = %d for ocv = %d\n", new_pc, ocv);
if (abs(new_pc - pc) > 0) {
/* Maximum spins to make in while-loop when searching in
* full resolution.
*/
const unsigned int max_spin_count =
chip->max_voltage_uv / 1000 - chip->v_cutoff + 1;
unsigned int count = 0;
int delta_mv = 5;
int diff = abs(new_pc - pc);
char sign = SIGN(new_pc - pc);
char old_sign;
int old_diff;
int old_ocv;
do {
count++;
old_ocv = ocv;
old_diff = diff;
old_sign = sign;
if (new_pc > pc)
ocv -= delta_mv;
else
ocv += delta_mv;
new_pc = interpolate_pc(chip->pc_temp_ocv_lut,
batt_temp_degc, ocv);
pr_debug("test revlookup pc = %d for ocv = %d\n",
new_pc, ocv);
diff = abs(new_pc - pc);
sign = SIGN(new_pc - pc);
if (sign != old_sign) {
if (delta_mv == 5) {
/*
* we crossed our desired PC probably
* becuase we were overcorrecting
*/
delta_mv = 1;
} else {
/* we crossed our desired PC even with
* 1mV steps, choose the best of two */
if (diff > old_diff)
ocv = old_ocv;
break;
}
}
} while (count <= max_spin_count && diff > 0);
}
*ocv_uv = ocv * 1000;
*rc_uah = (int)rc;
}
static void adjust_rc_and_uuc_for_specific_soc(
struct pm8921_bms_chip *chip,
int batt_temp,
int chargecycles,
int soc,
int fcc_uah,
int uuc_uah,
int cc_uah,
int rc_uah,
int rbatt,
int *ret_ocv,
int *ret_rc,
int *ret_uuc,
int *ret_rbatt)
{
int ocv_uv;
find_ocv_for_soc(chip, batt_temp, chargecycles,
fcc_uah, uuc_uah, cc_uah,
soc,
&rc_uah, &ocv_uv);
*ret_ocv = ocv_uv;
*ret_rbatt = rbatt;
*ret_rc = rc_uah;
*ret_uuc = uuc_uah;
}
static void calc_current_max(struct pm8921_bms_chip *chip, int ocv_uv,
int rbatt_mohm)
{
chip->imax_ua = 1000 * (ocv_uv - chip->v_cutoff * 1000) / rbatt_mohm;
}
static int bound_soc(int soc)
{
soc = max(0, soc);
soc = min(100, soc);
return soc;
}
static int charging_adjustments(struct pm8921_bms_chip *chip,
int soc, int vbat_uv, int ibat_ua,
int batt_temp, int chargecycles,
int fcc_uah, int cc_uah, int uuc_uah)
{
int chg_soc;
int vbat_batt_terminal_uv = vbat_uv
+ (ibat_ua * chip->rconn_mohm) / 1000;
if (chip->soc_at_cv == -EINVAL) {
/* In constant current charging return the calc soc */
if (vbat_batt_terminal_uv <= chip->max_voltage_uv)
pr_debug("CC CHG SOC %d\n", soc);
/* Note the CC to CV point */
if (vbat_batt_terminal_uv >= chip->max_voltage_uv) {
chip->soc_at_cv = soc;
chip->prev_chg_soc = soc;
chip->ibat_at_cv_ua = ibat_ua;
pr_debug("CC_TO_CV ibat_ua = %d CHG SOC %d\n",
ibat_ua, soc);
}
chip->prev_vbat_batt_terminal_uv = vbat_batt_terminal_uv;
return soc;
}
/*
* battery is in CV phase - begin liner inerpolation of soc based on
* battery charge current
*/
/*
* if the battery terminal voltage lessened (possibly because of
* a sudden increase in system load) keep reporting the prev chg soc
*/
if (vbat_batt_terminal_uv < chip->prev_vbat_batt_terminal_uv) {
pr_debug("vbat_terminals %d < prev = %d CC CHG SOC %d\n",
vbat_batt_terminal_uv,
chip->prev_vbat_batt_terminal_uv,
chip->prev_chg_soc);
chip->prev_vbat_batt_terminal_uv = vbat_batt_terminal_uv;
return chip->prev_chg_soc;
}
chg_soc = linear_interpolate(chip->soc_at_cv, chip->ibat_at_cv_ua,
100, -1 * chip->chg_term_ua,
ibat_ua);
chg_soc = bound_soc(chg_soc);
/* always report a higher soc */
if (chg_soc > chip->prev_chg_soc) {
int new_ocv_uv;
int new_rc;
chip->prev_chg_soc = chg_soc;
find_ocv_for_soc(chip, batt_temp, chargecycles,
fcc_uah, uuc_uah, cc_uah,
chg_soc,
&new_rc, &new_ocv_uv);
the_chip->last_ocv_uv = new_ocv_uv;
pr_debug("CC CHG ADJ OCV = %d CHG SOC %d\n",
new_ocv_uv,
chip->prev_chg_soc);
}
pr_debug("Reporting CHG SOC %d\n", chip->prev_chg_soc);
chip->prev_vbat_batt_terminal_uv = vbat_batt_terminal_uv;
return chip->prev_chg_soc;
}
static void very_low_voltage_check(struct pm8921_bms_chip *chip,
int ibat_ua, int vbat_uv)
{
int rc;
/*
* if battery is very low (v_cutoff voltage + 20mv) hold
* a wakelock untill soc = 0%
*/
if (vbat_uv <= (chip->alarm_low_mv + 20) * 1000 &&
!wake_lock_active(&the_chip->low_voltage_wake_lock)) {
pr_debug("voltage = %d low holding wakelock\n", vbat_uv);
wake_lock(&chip->low_voltage_wake_lock);
chip->soc_calc_period = chip->low_voltage_calc_ms;
}
if (vbat_uv > (chip->alarm_low_mv + 20 + BATT_ALARM_ACCURACY) * 1000
&& wake_lock_active(&the_chip->low_voltage_wake_lock)) {
pr_debug("voltage = %d releasing wakelock\n", vbat_uv);
chip->vbatt_cutoff_count = 0;
chip->soc_calc_period = chip->normal_voltage_calc_ms;
rc = pm8921_bms_enable_batt_alarm(chip);
if (rc)
pr_err("Unable to enable batt alarm\n");
wake_unlock(&chip->low_voltage_wake_lock);
}
}
static bool is_voltage_below_cutoff_window(struct pm8921_bms_chip *chip,
int ibat_ua, int vbat_uv)
{
if (vbat_uv < (chip->v_cutoff * 1000) && ibat_ua > 0) {
chip->vbatt_cutoff_count++;
if (chip->vbatt_cutoff_count >= chip->vbatt_cutoff_retries) {
pr_debug("cutoff_count >= %d\n",
chip->vbatt_cutoff_retries);
return true;
}
} else {
chip->vbatt_cutoff_count = 0;
}
return false;
}
static int last_soc_est = -EINVAL;
static int adjust_soc(struct pm8921_bms_chip *chip, int soc,
int batt_temp, int chargecycles,
int rbatt, int fcc_uah, int uuc_uah, int cc_uah)
{
int ibat_ua = 0, vbat_uv = 0;
int ocv_est_uv = 0, soc_est = 0, pc_est = 0, pc = 0;
int delta_ocv_uv = 0;
int n = 0;
int rc_new_uah = 0;
int pc_new = 0;
int soc_new = 0;
int m = 0;
int rc = 0;
int delta_ocv_uv_limit = 0;
int correction_limit_uv = 0;
rc = pm8921_bms_get_simultaneous_battery_voltage_and_current(
&ibat_ua,
&vbat_uv);
if (rc < 0) {
pr_err("simultaneous vbat ibat failed err = %d\n", rc);
goto out;
}
very_low_voltage_check(chip, ibat_ua, vbat_uv);
if (chip->low_voltage_detect &&
wake_lock_active(&chip->low_voltage_wake_lock)) {
if (is_voltage_below_cutoff_window(chip, ibat_ua, vbat_uv)) {
soc = 0;
pr_info("Voltage below cutoff, setting soc to 0\n");
goto out;
}
}
delta_ocv_uv_limit = DIV_ROUND_CLOSEST(ibat_ua, 1000);
ocv_est_uv = vbat_uv + (ibat_ua * rbatt)/1000;
calc_current_max(chip, ocv_est_uv, rbatt);
pc_est = calculate_pc(chip, ocv_est_uv, batt_temp, last_chargecycles);
soc_est = div_s64((s64)fcc_uah * pc_est - uuc_uah*100,
(s64)fcc_uah - uuc_uah);
soc_est = bound_soc(soc_est);
/* never adjust during bms reset mode */
if (bms_reset) {
pr_debug("bms reset mode, SOC adjustment skipped\n");
goto out;
}
if (ibat_ua < 0 && pm8921_is_batfet_closed()) {
soc = charging_adjustments(chip, soc, vbat_uv, ibat_ua,
batt_temp, chargecycles,
fcc_uah, cc_uah, uuc_uah);
goto out;
}
/*
* do not adjust
* if soc_est is same as what bms calculated
* OR if soc_est > 15
* OR if soc it is above 90 because we might pull it low
* and cause a bad user experience
*/
if (soc_est == soc
|| soc_est > 15
|| soc >= 90)
goto out;
if (last_soc_est == -EINVAL)
last_soc_est = soc;
n = min(200, max(1 , soc + soc_est + last_soc_est));
/* remember the last soc_est in last_soc_est */
last_soc_est = soc_est;
pc = calculate_pc(chip, chip->last_ocv_uv,
chip->last_ocv_temp_decidegc, last_chargecycles);
if (pc > 0) {
pc_new = calculate_pc(chip, chip->last_ocv_uv - (++m * 1000),
chip->last_ocv_temp_decidegc,
last_chargecycles);
while (pc_new == pc) {
/* start taking 10mV steps */
m = m + 10;
pc_new = calculate_pc(chip,
chip->last_ocv_uv - (m * 1000),
chip->last_ocv_temp_decidegc,
last_chargecycles);
}
} else {
/*
* pc is already at the lowest point,
* assume 1 millivolt translates to 1% pc
*/
pc = 1;
pc_new = 0;
m = 1;
}
delta_ocv_uv = div_s64((soc - soc_est) * (s64)m * 1000,
n * (pc - pc_new));
if (abs(delta_ocv_uv) > delta_ocv_uv_limit) {
pr_debug("limiting delta ocv %d limit = %d\n", delta_ocv_uv,
delta_ocv_uv_limit);
if (delta_ocv_uv > 0)
delta_ocv_uv = delta_ocv_uv_limit;
else
delta_ocv_uv = -1 * delta_ocv_uv_limit;
pr_debug("new delta ocv = %d\n", delta_ocv_uv);
}
if (chip->last_ocv_uv > 3800000)
correction_limit_uv = the_chip->high_ocv_correction_limit_uv;
else
correction_limit_uv = the_chip->low_ocv_correction_limit_uv;
if (abs(delta_ocv_uv) > correction_limit_uv) {
pr_debug("limiting delta ocv %d limit = %d\n", delta_ocv_uv,
correction_limit_uv);
if (delta_ocv_uv > 0)
delta_ocv_uv = correction_limit_uv;
else
delta_ocv_uv = -1 * correction_limit_uv;
pr_debug("new delta ocv = %d\n", delta_ocv_uv);
}
chip->last_ocv_uv -= delta_ocv_uv;
if (chip->last_ocv_uv >= chip->max_voltage_uv)
chip->last_ocv_uv = chip->max_voltage_uv;
/* calculate the soc based on this new ocv */
pc_new = calculate_pc(chip, chip->last_ocv_uv,
chip->last_ocv_temp_decidegc, last_chargecycles);
rc_new_uah = (fcc_uah * pc_new) / 100;
soc_new = (rc_new_uah - cc_uah - uuc_uah)*100 / (fcc_uah - uuc_uah);
soc_new = bound_soc(soc_new);
/*
* if soc_new is ZERO force it higher so that phone doesnt report soc=0
* soc = 0 should happen only when soc_est == 0
*/
if (soc_new == 0 && soc_est >= the_chip->hold_soc_est)
soc_new = 1;
soc = soc_new;
out:
pr_debug("ibat_ua = %d, vbat_uv = %d, ocv_est_uv = %d, pc_est = %d, "
"soc_est = %d, n = %d, delta_ocv_uv = %d, last_ocv_uv = %d, "
"pc_new = %d, soc_new = %d, rbatt = %d, m = %d\n",
ibat_ua, vbat_uv, ocv_est_uv, pc_est,
soc_est, n, delta_ocv_uv, chip->last_ocv_uv,
pc_new, soc_new, rbatt, m);
return soc;
}
#define IGNORE_SOC_TEMP_DECIDEG 50
#define IAVG_STEP_SIZE_MA 50
#define IAVG_START 600
#define SOC_ZERO 0xFF
static void backup_soc_and_iavg(struct pm8921_bms_chip *chip, int batt_temp,
int soc)
{
u8 temp;
int iavg_ma = chip->prev_uuc_iavg_ma;
if (iavg_ma > IAVG_START)
temp = (iavg_ma - IAVG_START) / IAVG_STEP_SIZE_MA;
else
temp = 0;
pm_bms_masked_write(chip, TEMP_IAVG_STORAGE,
TEMP_IAVG_STORAGE_USE_MASK, temp);
/* since only 6 bits are available for SOC, we store half the soc */
if (soc == 0)
temp = SOC_ZERO;
else
temp = soc;
/* don't store soc if temperature is below 5degC */
if (batt_temp > IGNORE_SOC_TEMP_DECIDEG)
pm8xxx_writeb(the_chip->dev->parent, TEMP_SOC_STORAGE, temp);
}
static void read_shutdown_soc_and_iavg(struct pm8921_bms_chip *chip)
{
int rc;
u8 temp;
rc = pm8xxx_readb(chip->dev->parent, TEMP_IAVG_STORAGE, &temp);
if (rc) {
pr_err("failed to read addr = %d %d assuming %d\n",
TEMP_IAVG_STORAGE, rc, IAVG_START);
chip->shutdown_iavg_ua = IAVG_START;
} else {
temp &= TEMP_IAVG_STORAGE_USE_MASK;
if (temp == 0) {
chip->shutdown_iavg_ua = IAVG_START;
} else {
chip->shutdown_iavg_ua = IAVG_START
+ IAVG_STEP_SIZE_MA * (temp + 1);
}
}
rc = pm8xxx_readb(chip->dev->parent, TEMP_SOC_STORAGE, &temp);
if (rc) {
pr_err("failed to read addr = %d %d\n", TEMP_SOC_STORAGE, rc);
} else {
chip->shutdown_soc = temp;
if (chip->shutdown_soc == 0) {
pr_debug("No shutdown soc available\n");
shutdown_soc_invalid = 1;
chip->shutdown_iavg_ua = 0;
} else if (chip->shutdown_soc == SOC_ZERO) {
chip->shutdown_soc = 0;
}
}
if (chip->ignore_shutdown_soc) {
shutdown_soc_invalid = 1;
chip->shutdown_soc = 0;
chip->shutdown_iavg_ua = 0;
}
pr_debug("shutdown_soc = %d shutdown_iavg = %d shutdown_soc_invalid = %d\n",
chip->shutdown_soc,
chip->shutdown_iavg_ua,
shutdown_soc_invalid);
}
#define SOC_CATCHUP_SEC_MAX 600
#define SOC_CATCHUP_SEC_PER_PERCENT 60
#define MAX_CATCHUP_SOC (SOC_CATCHUP_SEC_MAX/SOC_CATCHUP_SEC_PER_PERCENT)
static int scale_soc_while_chg(struct pm8921_bms_chip *chip,
int delta_time_us, int new_soc, int prev_soc)
{
int chg_time_sec;
int catch_up_sec;
int scaled_soc;
int numerator;
/*
* The device must be charging for reporting a higher soc, if
* not ignore this soc and continue reporting the prev_soc.
* Also don't report a high value immediately slowly scale the
* value from prev_soc to the new soc based on a charge time
* weighted average
*/
/* if we are not charging return last soc */
if (the_chip->start_percent == -EINVAL)
return prev_soc;
chg_time_sec = DIV_ROUND_UP(the_chip->charge_time_us, USEC_PER_SEC);
catch_up_sec = DIV_ROUND_UP(the_chip->catch_up_time_us, USEC_PER_SEC);
if (catch_up_sec == 0)
return new_soc;
pr_debug("cts= %d catch_up_sec = %d\n", chg_time_sec, catch_up_sec);
/*
* if we have been charging for more than catch_up time simply return
* new soc
*/
if (chg_time_sec > catch_up_sec)
return new_soc;
numerator = (catch_up_sec - chg_time_sec) * prev_soc
+ chg_time_sec * new_soc;
scaled_soc = numerator / catch_up_sec;
pr_debug("cts = %d new_soc = %d prev_soc = %d scaled_soc = %d\n",
chg_time_sec, new_soc, prev_soc, scaled_soc);
return scaled_soc;
}
static bool is_shutdown_soc_within_limits(struct pm8921_bms_chip *chip, int soc)
{
if (shutdown_soc_invalid) {
pr_debug("NOT forcing shutdown soc = %d\n", chip->shutdown_soc);
return 0;
}
if (abs(chip->shutdown_soc - soc) > chip->shutdown_soc_valid_limit) {
pr_debug("rejecting shutdown soc = %d, soc = %d limit = %d\n",
chip->shutdown_soc, soc,
chip->shutdown_soc_valid_limit);
shutdown_soc_invalid = 1;
return 0;
}
return 1;
}
static void update_power_supply(struct pm8921_bms_chip *chip)
{
if (chip->batt_psy == NULL || chip->batt_psy < 0)
chip->batt_psy = power_supply_get_by_name("battery");
if (chip->batt_psy > 0)
power_supply_changed(chip->batt_psy);
}
#define MIN_DELTA_625_UV 1000
static void calib_hkadc(struct pm8921_bms_chip *chip)
{
int voltage, rc;
struct pm8xxx_adc_chan_result result;
int usb_chg;
int this_delta;
mutex_lock(&chip->calib_mutex);
rc = pm8xxx_adc_read(the_chip->ref1p25v_channel, &result);
if (rc) {
pr_err("ADC failed for 1.25volts rc = %d\n", rc);
goto out;
}
voltage = xoadc_reading_to_microvolt(result.adc_code);
pr_debug("result 1.25v = 0x%x, voltage = %duV adc_meas = %lld\n",
result.adc_code, voltage, result.measurement);
chip->xoadc_v125 = voltage;
rc = pm8xxx_adc_read(the_chip->ref625mv_channel, &result);
if (rc) {
pr_err("ADC failed for 1.25volts rc = %d\n", rc);
goto out;
}
voltage = xoadc_reading_to_microvolt(result.adc_code);
usb_chg = usb_chg_plugged_in(chip);
pr_debug("result 0.625V = 0x%x, voltage = %duV adc_meas = %lld usb_chg = %d\n",
result.adc_code, voltage, result.measurement,
usb_chg);
if (usb_chg)
chip->xoadc_v0625_usb_present = voltage;
else
chip->xoadc_v0625_usb_absent = voltage;
chip->xoadc_v0625 = voltage;
if (chip->xoadc_v0625_usb_present && chip->xoadc_v0625_usb_absent) {
this_delta = chip->xoadc_v0625_usb_present
- chip->xoadc_v0625_usb_absent;
pr_debug("this_delta= %duV\n", this_delta);
if (this_delta > MIN_DELTA_625_UV)
last_usb_cal_delta_uv = this_delta;
pr_debug("625V_present= %d, 625V_absent= %d, delta = %duV\n",
chip->xoadc_v0625_usb_present,
chip->xoadc_v0625_usb_absent,
last_usb_cal_delta_uv);
}
pr_debug("calibration batt_temp = %d\n", chip->last_calib_temp);
out:
mutex_unlock(&chip->calib_mutex);
}
#define HKADC_CALIB_DELAY_S 600
#define HKADC_CALIB_DELTA_TEMP 20
static void calib_hkadc_check(struct pm8921_bms_chip *chip, int batt_temp)
{
unsigned long time_since_last_calib;
unsigned long tm_now_sec;
int delta_temp;
int rc;
rc = get_current_time(&tm_now_sec);
if (rc) {
pr_err("Could not read current time: %d\n", rc);
return;
}
if (tm_now_sec > chip->last_calib_time) {
time_since_last_calib = tm_now_sec - chip->last_calib_time;
delta_temp = abs(chip->last_calib_temp - batt_temp);
pr_debug("time since last calib: %lu, temp diff = %d\n",
time_since_last_calib, delta_temp);
if (time_since_last_calib >= HKADC_CALIB_DELAY_S
|| delta_temp > HKADC_CALIB_DELTA_TEMP) {
chip->last_calib_temp = batt_temp;
chip->last_calib_time = tm_now_sec;
calib_hkadc(chip);
}
}
}
/*
* Remaining Usable Charge = remaining_charge (charge at ocv instance)
* - coloumb counter charge
* - unusable charge (due to battery resistance)
* SOC% = (remaining usable charge/ fcc - usable_charge);
*/
static int calculate_state_of_charge(struct pm8921_bms_chip *chip,
struct pm8921_soc_params *raw,
int batt_temp, int chargecycles)
{
int remaining_usable_charge_uah, fcc_uah, unusable_charge_uah;
int remaining_charge_uah, soc;
int cc_uah;
int rbatt;
int iavg_ua;
int new_ocv;
int new_rc_uah;
int new_ucc_uah;
int new_rbatt;
int shutdown_soc;
int new_calculated_soc;
static int firsttime = 1;
calib_hkadc_check(chip, batt_temp);
calculate_soc_params(chip, raw, batt_temp, chargecycles,
&fcc_uah,
&unusable_charge_uah,
&remaining_charge_uah,
&cc_uah,
&rbatt,
&iavg_ua);
/* calculate remaining usable charge */
remaining_usable_charge_uah = remaining_charge_uah
- cc_uah
- unusable_charge_uah;
pr_debug("RUC = %duAh\n", remaining_usable_charge_uah);
if (fcc_uah - unusable_charge_uah <= 0) {
pr_debug("FCC = %duAh, UUC = %duAh forcing soc = 0\n",
fcc_uah, unusable_charge_uah);
soc = 0;
} else {
soc = DIV_ROUND_CLOSEST((remaining_usable_charge_uah * 100),
(fcc_uah - unusable_charge_uah));
}
if (firsttime && soc < 0) {
/*
* first time calcualtion and the pon ocv is too low resulting
* in a bad soc. Adjust ocv such that we get 0 soc
*/
pr_debug("soc is %d, adjusting pon ocv to make it 0\n", soc);
adjust_rc_and_uuc_for_specific_soc(
chip,
batt_temp, chargecycles,
0,
fcc_uah, unusable_charge_uah,
cc_uah, remaining_charge_uah,
rbatt,
&new_ocv,
&new_rc_uah, &new_ucc_uah,
&new_rbatt);
chip->last_ocv_uv = new_ocv;
remaining_charge_uah = new_rc_uah;
unusable_charge_uah = new_ucc_uah;
rbatt = new_rbatt;
remaining_usable_charge_uah = remaining_charge_uah
- cc_uah
- unusable_charge_uah;
soc = DIV_ROUND_CLOSEST((remaining_usable_charge_uah * 100),
(fcc_uah - unusable_charge_uah));
pr_debug("DONE for O soc is %d, pon ocv adjusted to %duV\n",
soc, chip->last_ocv_uv);
}
if (soc > 100)
soc = 100;
if (soc < 0) {
pr_debug("bad rem_usb_chg = %d rem_chg %d,"
"cc_uah %d, unusb_chg %d\n",
remaining_usable_charge_uah,
remaining_charge_uah,
cc_uah, unusable_charge_uah);
pr_debug("for bad rem_usb_chg last_ocv_uv = %d"
"chargecycles = %d, batt_temp = %d"
"fcc = %d soc =%d\n",
chip->last_ocv_uv, chargecycles, batt_temp,
fcc_uah, soc);
soc = 0;
}
mutex_lock(&soc_invalidation_mutex);
shutdown_soc = chip->shutdown_soc;
if (firsttime && soc != shutdown_soc
&& is_shutdown_soc_within_limits(chip, soc)) {
/*
* soc for the first time - use shutdown soc
* to adjust pon ocv since it is a small percent away from
* the real soc
*/
pr_debug("soc = %d before forcing shutdown_soc = %d\n",
soc, shutdown_soc);
adjust_rc_and_uuc_for_specific_soc(
chip,
batt_temp, chargecycles,
shutdown_soc,
fcc_uah, unusable_charge_uah,
cc_uah, remaining_charge_uah,
rbatt,
&new_ocv,
&new_rc_uah, &new_ucc_uah,
&new_rbatt);
chip->pon_ocv_uv = chip->last_ocv_uv;
chip->last_ocv_uv = new_ocv;
remaining_charge_uah = new_rc_uah;
unusable_charge_uah = new_ucc_uah;
rbatt = new_rbatt;
remaining_usable_charge_uah = remaining_charge_uah
- cc_uah
- unusable_charge_uah;
soc = DIV_ROUND_CLOSEST((remaining_usable_charge_uah * 100),
(fcc_uah - unusable_charge_uah));
pr_debug("DONE for shutdown_soc = %d soc is %d, adjusted ocv to %duV\n",
shutdown_soc, soc, chip->last_ocv_uv);
}
mutex_unlock(&soc_invalidation_mutex);
pr_debug("SOC before adjustment = %d\n", soc);
new_calculated_soc = adjust_soc(chip, soc, batt_temp, chargecycles,
rbatt, fcc_uah, unusable_charge_uah, cc_uah);
pr_debug("calculated SOC = %d\n", new_calculated_soc);
if (new_calculated_soc != calculated_soc) {
calculated_soc = new_calculated_soc;
update_power_supply(chip);
}
firsttime = 0;
get_current_time(&chip->last_recalc_time);
if (chip->disable_flat_portion_ocv) {
if (is_between(chip->ocv_dis_high_soc, chip->ocv_dis_low_soc,
calculated_soc)) {
pm8921_bms_stop_ocv_updates();
} else {
pm8921_bms_start_ocv_updates();
}
}
return calculated_soc;
}
static int recalculate_soc(struct pm8921_bms_chip *chip)
{
int batt_temp;
struct pm8921_soc_params raw;
int soc;
wake_lock(&the_chip->soc_wake_lock);
get_batt_temp(chip, &batt_temp);
mutex_lock(&chip->last_ocv_uv_mutex);
read_soc_params_raw(chip, &raw, batt_temp);
soc = calculate_state_of_charge(chip, &raw,
batt_temp, last_chargecycles);
mutex_unlock(&chip->last_ocv_uv_mutex);
wake_unlock(&the_chip->soc_wake_lock);
return soc;
}
static void calculate_soc_work(struct work_struct *work)
{
struct delayed_work *dwork = to_delayed_work(work);
struct pm8921_bms_chip *chip = container_of(dwork,
struct pm8921_bms_chip,
calculate_soc_delayed_work);
recalculate_soc(chip);
schedule_delayed_work(&chip->calculate_soc_delayed_work,
round_jiffies_relative(msecs_to_jiffies
(chip->soc_calc_period)));
}
static int report_state_of_charge(struct pm8921_bms_chip *chip)
{
int soc = calculated_soc;
int delta_time_us;
struct timespec now;
int batt_temp;
if (bms_fake_battery != -EINVAL) {
pr_debug("Returning Fake SOC = %d%%\n", bms_fake_battery);
return bms_fake_battery;
}
get_batt_temp(chip, &batt_temp);
do_posix_clock_monotonic_gettime(&now);
if (chip->t_soc_queried.tv_sec != 0) {
delta_time_us
= (now.tv_sec - chip->t_soc_queried.tv_sec) * USEC_PER_SEC
+ (now.tv_nsec - chip->t_soc_queried.tv_nsec) / 1000;
} else {
/* calculation for the first time */
delta_time_us = 0;
}
/*
* account for charge time - limit it to SOC_CATCHUP_SEC to
* avoid overflows when charging continues for extended periods
*/
if (the_chip->start_percent != -EINVAL) {
if (the_chip->charge_time_us == 0) {
/*
* calculating soc for the first time
* after start of chg. Initialize catchup time
*/
if (abs(soc - last_soc) < MAX_CATCHUP_SOC)
the_chip->catch_up_time_us =
(soc - last_soc) * SOC_CATCHUP_SEC_PER_PERCENT
* USEC_PER_SEC;
else
the_chip->catch_up_time_us =
SOC_CATCHUP_SEC_MAX * USEC_PER_SEC;
if (the_chip->catch_up_time_us < 0)
the_chip->catch_up_time_us = 0;
}
/* add charge time */
if (the_chip->charge_time_us
< SOC_CATCHUP_SEC_MAX * USEC_PER_SEC)
chip->charge_time_us += delta_time_us;
/* end catchup if calculated soc and last soc are same */
if (last_soc == soc)
the_chip->catch_up_time_us = 0;
}
/* last_soc < soc ... scale and catch up */
if (last_soc != -EINVAL && last_soc < soc && soc != 100)
soc = scale_soc_while_chg(chip, delta_time_us, soc, last_soc);
if (last_soc != -EINVAL) {
if (chip->first_report_after_suspend) {
chip->first_report_after_suspend = false;
if (chip->soc_updated_on_resume) {
/* coming here after a long suspend */
chip->soc_updated_on_resume = false;
if (last_soc < soc)
/* if soc has falsely increased during
* suspend, set the soc_at_suspend
*/
soc = chip->last_soc_at_suspend;
} else {
/*
* suspended for a short time
* report the last_soc before suspend
*/
soc = chip->last_soc_at_suspend;
}
} else if (soc < last_soc && soc != 0) {
soc = last_soc - 1;
} else if (soc > last_soc && soc != 100) {
soc = last_soc + 1;
}
}
last_soc = bound_soc(soc);
backup_soc_and_iavg(chip, batt_temp, last_soc);
pr_debug("Reported SOC = %d\n", last_soc);
chip->t_soc_queried = now;
return last_soc;
}
void pm8921_bms_battery_removed(void)
{
if (!the_chip) {
pr_err("called before initialization\n");
return;
}
pr_info("Battery Removed Cleaning up\n");
cancel_delayed_work_sync(&the_chip->calculate_soc_delayed_work);
calculated_soc = 0;
the_chip->start_percent = -EINVAL;
the_chip->end_percent = -EINVAL;
/* cleanup for charge time catchup */
the_chip->charge_time_us = 0;
the_chip->catch_up_time_us = 0;
/* cleanup for charge time adjusting */
the_chip->soc_at_cv = -EINVAL;
the_chip->soc_at_cv = -EINVAL;
the_chip->prev_chg_soc = -EINVAL;
the_chip->ibat_at_cv_ua = 0;
the_chip->prev_vbat_batt_terminal_uv = 0;
/* ocv cleanups */
the_chip->ocv_reading_at_100 = OCV_RAW_UNINITIALIZED;
the_chip->prev_last_good_ocv_raw = OCV_RAW_UNINITIALIZED;
the_chip->last_ocv_temp_decidegc = -EINVAL;
/* cleanup delta time */
the_chip->tm_sec = 0;
/* cc and avg current cleanups */
the_chip->prev_iavg_ua = 0;
the_chip->last_cc_uah = INT_MIN;
/* report SOC cleanups */
the_chip->t_soc_queried.tv_sec = 0;
the_chip->t_soc_queried.tv_nsec = 0;
last_soc = -EINVAL;
/* store invalid soc */
pm8xxx_writeb(the_chip->dev->parent, TEMP_SOC_STORAGE, 0);
/* fcc learning cleanup */
if (the_chip->enable_fcc_learning) {
battery_removed = 1;
sysfs_notify(&the_chip->dev->kobj, NULL, "fcc_data");
}
/* UUC related data is left as is - use the same historical load avg */
update_power_supply(the_chip);
}
EXPORT_SYMBOL(pm8921_bms_battery_removed);
void pm8921_bms_battery_inserted(void)
{
if (!the_chip) {
pr_err("called before initialization\n");
return;
}
pr_info("Battery Inserted\n");
the_chip->last_ocv_uv = estimate_ocv(the_chip);
schedule_delayed_work(&the_chip->calculate_soc_delayed_work, 0);
}
EXPORT_SYMBOL(pm8921_bms_battery_inserted);
void pm8921_bms_invalidate_shutdown_soc(void)
{
int calculate_soc = 0;
struct pm8921_bms_chip *chip = the_chip;
/* clean up the fcc learning table */
if (!the_chip)
the_chip->adjusted_fcc_temp_lut = NULL;
last_fcc_update_count = 0;
last_real_fcc_mah = -EINVAL;
last_real_fcc_batt_temp = -EINVAL;
battery_removed = 1;
pr_debug("Invalidating shutdown soc - the battery was removed\n");
if (shutdown_soc_invalid)
return;
mutex_lock(&soc_invalidation_mutex);
shutdown_soc_invalid = 1;
last_soc = -EINVAL;
if (the_chip) {
/* reset to pon ocv undoing what the adjusting did */
if (the_chip->pon_ocv_uv) {
the_chip->last_ocv_uv = the_chip->pon_ocv_uv;
calculate_soc = 1;
pr_debug("resetting ocv to pon_ocv = %d\n",
the_chip->pon_ocv_uv);
}
}
mutex_unlock(&soc_invalidation_mutex);
if (!calculate_soc)
return;
recalculate_soc(chip);
}
EXPORT_SYMBOL(pm8921_bms_invalidate_shutdown_soc);
static void calibrate_hkadc_work(struct work_struct *work)
{
struct pm8921_bms_chip *chip = container_of(work,
struct pm8921_bms_chip, calib_hkadc_work);
calib_hkadc(chip);
}
void pm8921_bms_calibrate_hkadc(void)
{
schedule_work(&the_chip->calib_hkadc_work);
}
int pm8921_bms_get_vsense_avg(int *result)
{
int rc = -EINVAL;
if (the_chip) {
mutex_lock(&the_chip->bms_output_lock);
pm_bms_lock_output_data(the_chip);
rc = read_vsense_avg(the_chip, result);
pm_bms_unlock_output_data(the_chip);
mutex_unlock(&the_chip->bms_output_lock);
}
pr_err("called before initialization\n");
return rc;
}
EXPORT_SYMBOL(pm8921_bms_get_vsense_avg);
int pm8921_bms_get_battery_current(int *result_ua)
{
int vsense_uv;
int rc = 0;
*result_ua = 0;
if (!the_chip) {
pr_err("called before initialization\n");
return -EINVAL;
}
if (the_chip->r_sense_uohm == 0) {
pr_err("r_sense is zero\n");
return -EINVAL;
}
mutex_lock(&the_chip->bms_output_lock);
pm_bms_lock_output_data(the_chip);
rc = read_vsense_avg(the_chip, &vsense_uv);
pm_bms_unlock_output_data(the_chip);
mutex_unlock(&the_chip->bms_output_lock);
if (rc) {
pr_err("Unable to read vsense average\n");
goto error_vsense;
}
pr_debug("vsense=%duV\n", vsense_uv);
/* cast for signed division */
*result_ua = div_s64(vsense_uv * 1000000LL, the_chip->r_sense_uohm);
pr_debug("ibat=%duA\n", *result_ua);
error_vsense:
return rc;
}
EXPORT_SYMBOL(pm8921_bms_get_battery_current);
int pm8921_bms_get_percent_charge(void)
{
if (!the_chip) {
pr_err("called before initialization\n");
return -EINVAL;
}
return report_state_of_charge(the_chip);
}
EXPORT_SYMBOL_GPL(pm8921_bms_get_percent_charge);
int pm8921_bms_get_current_max(void)
{
if (!the_chip) {
pr_err("called before initialization\n");
return -EINVAL;
}
return the_chip->imax_ua;
}
EXPORT_SYMBOL_GPL(pm8921_bms_get_current_max);
int pm8921_bms_get_fcc(void)
{
int batt_temp;
if (!the_chip) {
pr_err("called before initialization\n");
return -EINVAL;
}
get_batt_temp(the_chip, &batt_temp);
return calculate_fcc_uah(the_chip, batt_temp, last_chargecycles);
}
EXPORT_SYMBOL_GPL(pm8921_bms_get_fcc);
static void calculate_real_soc(struct pm8921_bms_chip *chip, int *soc,
int batt_temp, struct pm8921_soc_params *raw, int cc_uah)
{
int fcc_uah = 0, rc_uah = 0;
fcc_uah = calculate_fcc_uah(chip, batt_temp, last_chargecycles);
rc_uah = calculate_remaining_charge_uah(chip, raw,
fcc_uah, batt_temp, last_chargecycles);
*soc = ((rc_uah - cc_uah) * 100) / fcc_uah;
pr_debug("fcc = %d, rc = %d, cc = %d Real SOC = %d\n",
fcc_uah, rc_uah, cc_uah, *soc);
}
void pm8921_bms_charging_began(void)
{
struct pm8921_soc_params raw;
int batt_temp;
get_batt_temp(the_chip, &batt_temp);
mutex_lock(&the_chip->last_ocv_uv_mutex);
read_soc_params_raw(the_chip, &raw, batt_temp);
mutex_unlock(&the_chip->last_ocv_uv_mutex);
the_chip->start_percent = report_state_of_charge(the_chip);
bms_start_percent = the_chip->start_percent;
bms_start_ocv_uv = raw.last_good_ocv_uv;
calculate_cc_uah(the_chip, raw.cc, &bms_start_cc_uah);
pm_bms_masked_write(the_chip, BMS_TOLERANCES,
IBAT_TOL_MASK, IBAT_TOL_DEFAULT);
the_chip->charge_time_us = 0;
the_chip->catch_up_time_us = 0;
the_chip->soc_at_cv = -EINVAL;
the_chip->prev_chg_soc = -EINVAL;
if (the_chip->enable_fcc_learning) {
calculate_real_soc(the_chip, &the_chip->start_real_soc,
batt_temp, &raw, bms_start_cc_uah);
the_chip->pc_at_start_charge =
interpolate_pc(the_chip->pc_temp_ocv_lut, batt_temp,
bms_start_ocv_uv / 1000);
pr_debug("Start real soc = %d, start pc = %d\n",
the_chip->start_real_soc, the_chip->pc_at_start_charge);
}
pr_debug("start_percent = %u%%\n", the_chip->start_percent);
}
EXPORT_SYMBOL_GPL(pm8921_bms_charging_began);
static void invalidate_fcc(struct pm8921_bms_chip *chip)
{
memset(chip->fcc_table, 0, chip->max_fcc_learning_samples *
sizeof(*(chip->fcc_table)));
last_fcc_update_count = 0;
chip->adjusted_fcc_temp_lut = NULL;
last_real_fcc_mah = -EINVAL;
last_real_fcc_batt_temp = -EINVAL;
last_chargecycles = 0;
last_charge_increase = 0;
}
static void update_fcc_table_for_temp(struct pm8921_bms_chip *chip,
int batt_temp_final)
{
int i, fcc_t1, fcc_t2, fcc_final;
struct fcc_data *ft;
/* Interpolate all the FCC entries to the same temperature */
for (i = 0; i < chip->max_fcc_learning_samples; i++) {
ft = &chip->fcc_table[i];
if (ft->batt_temp == batt_temp_final)
continue;
fcc_t1 = interpolate_fcc(chip->fcc_temp_lut, ft->batt_temp);
fcc_t2 = interpolate_fcc(chip->fcc_temp_lut, batt_temp_final);
fcc_final = (ft->fcc_new / fcc_t1) * fcc_t2;
ft->fcc_new = fcc_final;
ft->batt_temp = batt_temp_final;
}
}
static void update_fcc_learning_table(struct pm8921_bms_chip *chip,
int fcc_uah, int new_fcc_uah, int chargecycles, int batt_temp)
{
int i, temp_fcc_avg = 0, new_fcc_avg = 0, temp_fcc_delta = 0, count;
struct fcc_data *ft;
count = last_fcc_update_count % chip->max_fcc_learning_samples;
ft = &chip->fcc_table[count];
ft->fcc_new = ft->fcc_real = new_fcc_uah;
ft->batt_temp = ft->temp_real = batt_temp;
ft->chargecycles = chargecycles;
chip->fcc_new = new_fcc_uah;
last_fcc_update_count++;
/* update userspace with the new data */
sysfs_notify(&chip->dev->kobj, NULL, "fcc_data");
pr_debug("Updated fcc table. new_fcc=%d, chargecycle=%d, temp=%d fcc_update_count=%d\n",
new_fcc_uah, chargecycles, batt_temp, last_fcc_update_count);
if (last_fcc_update_count < chip->max_fcc_learning_samples) {
pr_debug("Not enough FCC samples. Current count = %d\n",
last_fcc_update_count);
return; /* Not enough samples to update fcc */
}
/* reject entries if they are > 50 chargecycles apart */
for (i = 0; i < chip->max_fcc_learning_samples; i++) {
if ((chip->fcc_table[i].chargecycles + VALID_FCC_CHGCYL_RANGE)
< chargecycles) {
pr_debug("Charge cycle too old (> %d cycles apart)\n",
VALID_FCC_CHGCYL_RANGE);
return; /* Samples old, > 50 cycles apart*/
}
}
/* update the fcc table for temperature difference*/
update_fcc_table_for_temp(chip, batt_temp);
/* Calculate the avg. and SD for all the fcc entries */
for (i = 0; i < chip->max_fcc_learning_samples; i++)
temp_fcc_avg += chip->fcc_table[i].fcc_new;
temp_fcc_avg /= chip->max_fcc_learning_samples;
temp_fcc_delta = div_u64(temp_fcc_avg * DELTA_FCC_PERCENT, 100);
/* fix the fcc if its an outlier i.e. > 5% of the average */
for (i = 0; i < chip->max_fcc_learning_samples; i++) {
ft = &chip->fcc_table[i];
if (abs(ft->fcc_new - temp_fcc_avg) > temp_fcc_delta)
ft->fcc_new = temp_fcc_avg;
new_fcc_avg += ft->fcc_new;
}
new_fcc_avg /= chip->max_fcc_learning_samples;
last_real_fcc_mah = new_fcc_avg/1000;
last_real_fcc_batt_temp = batt_temp;
pr_debug("FCC update: last_real_fcc_mah=%d, last_real_fcc_batt_temp=%d\n",
new_fcc_avg, batt_temp);
readjust_fcc_table();
}
static bool is_new_fcc_valid(int new_fcc_uah, int fcc_uah)
{
/* reject the new fcc if < 50% and > 105% of nominal fcc */
if ((new_fcc_uah >= (fcc_uah / 2)) &&
((new_fcc_uah * 100) <= (fcc_uah * 105)))
return true;
pr_debug("FCC rejected - not within valid limit\n");
return false;
}
void pm8921_bms_charging_end(int is_battery_full)
{
int batt_temp;
struct pm8921_soc_params raw;
if (the_chip == NULL)
return;
get_batt_temp(the_chip, &batt_temp);
mutex_lock(&the_chip->last_ocv_uv_mutex);
read_soc_params_raw(the_chip, &raw, batt_temp);
calculate_cc_uah(the_chip, raw.cc, &bms_end_cc_uah);
bms_end_ocv_uv = raw.last_good_ocv_uv;
pr_debug("battery_full = %d, fcc_learning = %d, pc_start_chg = %d\n",
is_battery_full, the_chip->enable_fcc_learning,
the_chip->pc_at_start_charge);
if (is_battery_full && the_chip->enable_fcc_learning &&
(the_chip->start_percent <= the_chip->min_fcc_learning_soc) &&
(the_chip->pc_at_start_charge <= the_chip->min_fcc_ocv_pc)) {
int fcc_uah, new_fcc_uah, delta_cc_uah, delta_soc;
/* new_fcc = (cc_end - cc_start) / (end_soc - start_soc) */
delta_soc = 100 - the_chip->start_real_soc;
delta_cc_uah = abs(bms_end_cc_uah - bms_start_cc_uah);
new_fcc_uah = div_u64(delta_cc_uah * 100, delta_soc);
fcc_uah = calculate_fcc_uah(the_chip, batt_temp,
last_chargecycles);
pr_info("start_real_soc = %d, end_real_soc = 100, start_cc = %d, end_cc = %d, nominal_fcc = %d, new_fcc = %d\n",
the_chip->start_real_soc, bms_start_cc_uah,
bms_end_cc_uah, fcc_uah, new_fcc_uah);
if (is_new_fcc_valid(new_fcc_uah, fcc_uah))
update_fcc_learning_table(the_chip, fcc_uah,
new_fcc_uah, last_chargecycles, batt_temp);
}
if (is_battery_full) {
the_chip->ocv_reading_at_100 = raw.last_good_ocv_raw;
the_chip->last_ocv_uv = the_chip->max_voltage_uv;
raw.last_good_ocv_uv = the_chip->max_voltage_uv;
raw.cc = 0;
/* reset the cc in h/w */
reset_cc(the_chip);
the_chip->last_ocv_temp_decidegc = batt_temp;
/*
* since we are treating this as an ocv event
* forget the old cc value
*/
the_chip->last_cc_uah = 0;
pr_debug("EOC BATT_FULL ocv_reading = 0x%x\n",
the_chip->ocv_reading_at_100);
}
the_chip->end_percent = calculate_state_of_charge(the_chip, &raw,
batt_temp, last_chargecycles);
mutex_unlock(&the_chip->last_ocv_uv_mutex);
bms_end_percent = the_chip->end_percent;
if (the_chip->end_percent > the_chip->start_percent) {
last_charge_increase +=
the_chip->end_percent - the_chip->start_percent;
if (last_charge_increase > 100) {
last_chargecycles++;
last_charge_increase = last_charge_increase % 100;
}
}
pr_debug("end_percent = %u%% last_charge_increase = %d"
"last_chargecycles = %d\n",
the_chip->end_percent,
last_charge_increase,
last_chargecycles);
the_chip->start_percent = -EINVAL;
the_chip->end_percent = -EINVAL;
the_chip->charge_time_us = 0;
the_chip->catch_up_time_us = 0;
the_chip->soc_at_cv = -EINVAL;
the_chip->prev_chg_soc = -EINVAL;
pm_bms_masked_write(the_chip, BMS_TOLERANCES,
IBAT_TOL_MASK, IBAT_TOL_NOCHG);
}
EXPORT_SYMBOL_GPL(pm8921_bms_charging_end);
static irqreturn_t pm8921_bms_sbi_write_ok_handler(int irq, void *data)
{
pr_debug("irq = %d triggered", irq);
return IRQ_HANDLED;
}
static irqreturn_t pm8921_bms_cc_thr_handler(int irq, void *data)
{
pr_debug("irq = %d triggered", irq);
return IRQ_HANDLED;
}
static irqreturn_t pm8921_bms_vsense_thr_handler(int irq, void *data)
{
pr_debug("irq = %d triggered", irq);
return IRQ_HANDLED;
}
static irqreturn_t pm8921_bms_vsense_for_r_handler(int irq, void *data)
{
pr_debug("irq = %d triggered", irq);
return IRQ_HANDLED;
}
static irqreturn_t pm8921_bms_ocv_for_r_handler(int irq, void *data)
{
struct pm8921_bms_chip *chip = data;
pr_debug("irq = %d triggered", irq);
schedule_work(&chip->calib_hkadc_work);
return IRQ_HANDLED;
}
static irqreturn_t pm8921_bms_good_ocv_handler(int irq, void *data)
{
struct pm8921_bms_chip *chip = data;
pr_debug("irq = %d triggered", irq);
schedule_work(&chip->calib_hkadc_work);
return IRQ_HANDLED;
}
struct pm_bms_irq_init_data {
unsigned int irq_id;
char *name;
unsigned long flags;
irqreturn_t (*handler)(int, void *);
};
#define BMS_IRQ(_id, _flags, _handler) \
{ \
.irq_id = _id, \
.name = #_id, \
.flags = _flags, \
.handler = _handler, \
}
struct pm_bms_irq_init_data bms_irq_data[] = {
BMS_IRQ(PM8921_BMS_SBI_WRITE_OK, IRQF_TRIGGER_RISING,
pm8921_bms_sbi_write_ok_handler),
BMS_IRQ(PM8921_BMS_CC_THR, IRQF_TRIGGER_RISING,
pm8921_bms_cc_thr_handler),
BMS_IRQ(PM8921_BMS_VSENSE_THR, IRQF_TRIGGER_RISING,
pm8921_bms_vsense_thr_handler),
BMS_IRQ(PM8921_BMS_VSENSE_FOR_R, IRQF_TRIGGER_RISING,
pm8921_bms_vsense_for_r_handler),
BMS_IRQ(PM8921_BMS_OCV_FOR_R, IRQF_TRIGGER_RISING,
pm8921_bms_ocv_for_r_handler),
BMS_IRQ(PM8921_BMS_GOOD_OCV, IRQF_TRIGGER_RISING,
pm8921_bms_good_ocv_handler),
};
static void free_irqs(struct pm8921_bms_chip *chip)
{
int i;
for (i = 0; i < PM_BMS_MAX_INTS; i++)
if (chip->pmic_bms_irq[i]) {
free_irq(chip->pmic_bms_irq[i], NULL);
chip->pmic_bms_irq[i] = 0;
}
}
static int __devinit request_irqs(struct pm8921_bms_chip *chip,
struct platform_device *pdev)
{
struct resource *res;
int ret, i;
ret = 0;
bitmap_fill(chip->enabled_irqs, PM_BMS_MAX_INTS);
for (i = 0; i < ARRAY_SIZE(bms_irq_data); i++) {
res = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
bms_irq_data[i].name);
if (res == NULL) {
pr_err("couldn't find %s\n", bms_irq_data[i].name);
goto err_out;
}
ret = request_irq(res->start, bms_irq_data[i].handler,
bms_irq_data[i].flags,
bms_irq_data[i].name, chip);
if (ret < 0) {
pr_err("couldn't request %d (%s) %d\n", res->start,
bms_irq_data[i].name, ret);
goto err_out;
}
chip->pmic_bms_irq[bms_irq_data[i].irq_id] = res->start;
pm8921_bms_disable_irq(chip, bms_irq_data[i].irq_id);
}
return 0;
err_out:
free_irqs(chip);
return -EINVAL;
}
#define EN_BMS_BIT BIT(7)
#define EN_PON_HS_BIT BIT(0)
static int __devinit pm8921_bms_hw_init(struct pm8921_bms_chip *chip)
{
int rc;
rc = pm_bms_masked_write(chip, BMS_CONTROL,
EN_BMS_BIT | EN_PON_HS_BIT, EN_BMS_BIT | EN_PON_HS_BIT);
if (rc) {
pr_err("failed to enable pon and bms addr = %d %d",
BMS_CONTROL, rc);
}
/* The charger will call start charge later if usb is present */
pm_bms_masked_write(chip, BMS_TOLERANCES,
IBAT_TOL_MASK, IBAT_TOL_NOCHG);
return 0;
}
static void check_initial_ocv(struct pm8921_bms_chip *chip)
{
int ocv_uv, rc;
int16_t ocv_raw;
int usb_chg;
/*
* Check if a ocv is available in bms hw,
* if not compute it here at boot time and save it
* in the last_ocv_uv.
*/
ocv_uv = 0;
pm_bms_read_output_data(chip, LAST_GOOD_OCV_VALUE, &ocv_raw);
usb_chg = usb_chg_plugged_in(chip);
rc = convert_vbatt_raw_to_uv(chip, usb_chg, ocv_raw, &ocv_uv);
if (rc || ocv_uv == 0) {
rc = adc_based_ocv(chip, &ocv_uv);
if (rc) {
pr_err("failed to read adc based ocv_uv rc = %d\n", rc);
ocv_uv = DEFAULT_OCV_MICROVOLTS;
}
}
chip->last_ocv_uv = ocv_uv;
pr_debug("ocv_uv = %d last_ocv_uv = %d\n", ocv_uv, chip->last_ocv_uv);
}
static int64_t read_battery_id(struct pm8921_bms_chip *chip)
{
int rc;
struct pm8xxx_adc_chan_result result;
rc = pm8xxx_adc_read(chip->batt_id_channel, &result);
if (rc) {
pr_err("error reading batt id channel = %d, rc = %d\n",
chip->vbat_channel, rc);
return rc;
}
pr_debug("batt_id phy = %lld meas = 0x%llx\n", result.physical,
result.measurement);
return result.adc_code;
}
#define PALLADIUM_ID_MIN 0x7F40
#define PALLADIUM_ID_MAX 0x7F5A
#define DESAY_5200_ID_MIN 0x7F7F
#define DESAY_5200_ID_MAX 0x802F
static int set_battery_data(struct pm8921_bms_chip *chip)
{
int64_t battery_id;
if (chip->batt_type == BATT_DESAY)
goto desay;
else if (chip->batt_type == BATT_PALLADIUM)
goto palladium;
battery_id = read_battery_id(chip);
if (battery_id < 0) {
pr_err("cannot read battery id err = %lld\n", battery_id);
return battery_id;
}
if (is_between(PALLADIUM_ID_MIN, PALLADIUM_ID_MAX, battery_id)) {
goto palladium;
} else if (is_between(DESAY_5200_ID_MIN, DESAY_5200_ID_MAX,
battery_id)) {
goto desay;
} else {
pr_warn("invalid battid, palladium 1500 assumed batt_id %llx\n",
battery_id);
goto palladium;
}
palladium:
chip->fcc = palladium_1500_data.fcc;
chip->fcc_temp_lut = palladium_1500_data.fcc_temp_lut;
chip->fcc_sf_lut = palladium_1500_data.fcc_sf_lut;
chip->pc_temp_ocv_lut = palladium_1500_data.pc_temp_ocv_lut;
chip->pc_sf_lut = palladium_1500_data.pc_sf_lut;
chip->rbatt_sf_lut = palladium_1500_data.rbatt_sf_lut;
chip->default_rbatt_mohm
= palladium_1500_data.default_rbatt_mohm;
chip->delta_rbatt_mohm = palladium_1500_data.delta_rbatt_mohm;
chip->rbatt_capacitive_mohm
= palladium_1500_data.rbatt_capacitive_mohm;
return 0;
desay:
chip->fcc = desay_5200_data.fcc;
chip->fcc_temp_lut = desay_5200_data.fcc_temp_lut;
chip->pc_temp_ocv_lut = desay_5200_data.pc_temp_ocv_lut;
chip->pc_sf_lut = desay_5200_data.pc_sf_lut;
chip->rbatt_sf_lut = desay_5200_data.rbatt_sf_lut;
chip->default_rbatt_mohm = desay_5200_data.default_rbatt_mohm;
chip->delta_rbatt_mohm = desay_5200_data.delta_rbatt_mohm;
chip->rbatt_capacitive_mohm
= desay_5200_data.rbatt_capacitive_mohm;
return 0;
}
enum bms_request_operation {
CALC_FCC,
CALC_PC,
CALC_SOC,
CALIB_HKADC,
CALIB_CCADC,
GET_VBAT_VSENSE_SIMULTANEOUS,
STOP_OCV,
START_OCV,
SET_OCV,
BATT_PRESENT,
};
static int test_batt_temp = 5;
static int test_chargecycle = 150;
static int test_ocv = 3900000;
enum {
TEST_BATT_TEMP,
TEST_CHARGE_CYCLE,
TEST_OCV,
};
static int get_test_param(void *data, u64 * val)
{
switch ((int)data) {
case TEST_BATT_TEMP:
*val = test_batt_temp;
break;
case TEST_CHARGE_CYCLE:
*val = test_chargecycle;
break;
case TEST_OCV:
*val = test_ocv;
break;
default:
return -EINVAL;
}
return 0;
}
static int set_test_param(void *data, u64 val)
{
switch ((int)data) {
case TEST_BATT_TEMP:
test_batt_temp = (int)val;
break;
case TEST_CHARGE_CYCLE:
test_chargecycle = (int)val;
break;
case TEST_OCV:
test_ocv = (int)val;
break;
default:
return -EINVAL;
}
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(temp_fops, get_test_param, set_test_param, "%llu\n");
static int get_calc(void *data, u64 * val)
{
int param = (int)data;
int ret = 0;
int ibat_ua, vbat_uv;
struct pm8921_soc_params raw;
read_soc_params_raw(the_chip, &raw, 300);
*val = 0;
/* global irq number passed in via data */
switch (param) {
case CALC_FCC:
*val = calculate_fcc_uah(the_chip, test_batt_temp,
test_chargecycle);
break;
case CALC_PC:
*val = calculate_pc(the_chip, test_ocv, test_batt_temp,
test_chargecycle);
break;
case CALC_SOC:
*val = calculate_state_of_charge(the_chip, &raw,
test_batt_temp, test_chargecycle);
break;
case CALIB_HKADC:
/* reading this will trigger calibration */
*val = 0;
calib_hkadc(the_chip);
break;
case CALIB_CCADC:
/* reading this will trigger calibration */
*val = 0;
pm8xxx_calib_ccadc();
break;
case GET_VBAT_VSENSE_SIMULTANEOUS:
/* reading this will call simultaneous vbat and vsense */
*val =
pm8921_bms_get_simultaneous_battery_voltage_and_current(
&ibat_ua,
&vbat_uv);
default:
ret = -EINVAL;
}
return ret;
}
static int set_calc(void *data, u64 val)
{
int param = (int)data;
int ret = 0;
switch (param) {
case STOP_OCV:
pm8921_bms_stop_ocv_updates();
break;
case START_OCV:
pm8921_bms_start_ocv_updates();
break;
default:
ret = -EINVAL;
}
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(calc_fops, get_calc, set_calc, "%llu\n");
static int get_reading(void *data, u64 * val)
{
int param = (int)data;
int ret = 0;
struct pm8921_soc_params raw;
mutex_lock(&the_chip->last_ocv_uv_mutex);
read_soc_params_raw(the_chip, &raw, 300);
mutex_lock(&the_chip->last_ocv_uv_mutex);
*val = 0;
switch (param) {
case CC_MSB:
case CC_LSB:
*val = raw.cc;
break;
case LAST_GOOD_OCV_VALUE:
*val = raw.last_good_ocv_uv;
break;
case VSENSE_AVG:
read_vsense_avg(the_chip, (uint *)val);
break;
default:
ret = -EINVAL;
}
return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(reading_fops, get_reading, NULL, "%lld\n");
static int get_rt_status(void *data, u64 * val)
{
int i = (int)data;
int ret;
/* global irq number passed in via data */
ret = pm_bms_get_rt_status(the_chip, i);
*val = ret;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(rt_fops, get_rt_status, NULL, "%llu\n");
static int get_reg(void *data, u64 * val)
{
int addr = (int)data;
int ret;
u8 temp;
ret = pm8xxx_readb(the_chip->dev->parent, addr, &temp);
if (ret) {
pr_err("pm8xxx_readb to %x value = %d errored = %d\n",
addr, temp, ret);
return -EAGAIN;
}
*val = temp;
return 0;
}
static int set_reg(void *data, u64 val)
{
int addr = (int)data;
int ret;
u8 temp;
temp = (u8) val;
ret = pm8xxx_writeb(the_chip->dev->parent, addr, temp);
if (ret) {
pr_err("pm8xxx_writeb to %x value = %d errored = %d\n",
addr, temp, ret);
return -EAGAIN;
}
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(reg_fops, get_reg, set_reg, "0x%02llx\n");
static void create_debugfs_entries(struct pm8921_bms_chip *chip)
{
int i;
chip->dent = debugfs_create_dir("pm8921-bms", NULL);
if (IS_ERR(chip->dent)) {
pr_err("pmic bms couldnt create debugfs dir\n");
return;
}
debugfs_create_file("BMS_CONTROL", 0644, chip->dent,
(void *)BMS_CONTROL, &reg_fops);
debugfs_create_file("BMS_OUTPUT0", 0644, chip->dent,
(void *)BMS_OUTPUT0, &reg_fops);
debugfs_create_file("BMS_OUTPUT1", 0644, chip->dent,
(void *)BMS_OUTPUT1, &reg_fops);
debugfs_create_file("BMS_TEST1", 0644, chip->dent,
(void *)BMS_TEST1, &reg_fops);
debugfs_create_file("test_batt_temp", 0644, chip->dent,
(void *)TEST_BATT_TEMP, &temp_fops);
debugfs_create_file("test_chargecycle", 0644, chip->dent,
(void *)TEST_CHARGE_CYCLE, &temp_fops);
debugfs_create_file("test_ocv", 0644, chip->dent,
(void *)TEST_OCV, &temp_fops);
debugfs_create_file("read_cc", 0644, chip->dent,
(void *)CC_MSB, &reading_fops);
debugfs_create_file("read_last_good_ocv", 0644, chip->dent,
(void *)LAST_GOOD_OCV_VALUE, &reading_fops);
debugfs_create_file("read_vbatt_for_rbatt", 0644, chip->dent,
(void *)VBATT_FOR_RBATT, &reading_fops);
debugfs_create_file("read_vsense_for_rbatt", 0644, chip->dent,
(void *)VSENSE_FOR_RBATT, &reading_fops);
debugfs_create_file("read_ocv_for_rbatt", 0644, chip->dent,
(void *)OCV_FOR_RBATT, &reading_fops);
debugfs_create_file("read_vsense_avg", 0644, chip->dent,
(void *)VSENSE_AVG, &reading_fops);
debugfs_create_file("show_fcc", 0644, chip->dent,
(void *)CALC_FCC, &calc_fops);
debugfs_create_file("show_pc", 0644, chip->dent,
(void *)CALC_PC, &calc_fops);
debugfs_create_file("show_soc", 0644, chip->dent,
(void *)CALC_SOC, &calc_fops);
debugfs_create_file("calib_hkadc", 0644, chip->dent,
(void *)CALIB_HKADC, &calc_fops);
debugfs_create_file("calib_ccadc", 0644, chip->dent,
(void *)CALIB_CCADC, &calc_fops);
debugfs_create_file("stop_ocv", 0644, chip->dent,
(void *)STOP_OCV, &calc_fops);
debugfs_create_file("start_ocv", 0644, chip->dent,
(void *)START_OCV, &calc_fops);
debugfs_create_file("set_ocv", 0644, chip->dent,
(void *)SET_OCV, &calc_fops);
debugfs_create_file("batt_present", 0644, chip->dent,
(void *)BATT_PRESENT, &calc_fops);
debugfs_create_file("simultaneous", 0644, chip->dent,
(void *)GET_VBAT_VSENSE_SIMULTANEOUS, &calc_fops);
for (i = 0; i < ARRAY_SIZE(bms_irq_data); i++) {
if (chip->pmic_bms_irq[bms_irq_data[i].irq_id])
debugfs_create_file(bms_irq_data[i].name, 0444,
chip->dent,
(void *)bms_irq_data[i].irq_id,
&rt_fops);
}
}
static ssize_t fcc_data_set(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct pm8921_bms_chip *chip = dev_get_drvdata(dev);
static int i;
int fcc_new = 0, rc;
if (battery_removed) {
pr_debug("Invalid FCC table. Possible battery removal\n");
last_fcc_update_count = 0;
return count;
}
i %= chip->max_fcc_learning_samples;
rc = sscanf(buf, "%d", &fcc_new);
if (rc != 1)
return -EINVAL;
chip->fcc_table[i].fcc_new = fcc_new;
chip->fcc_table[i].fcc_real = fcc_new;
pr_debug("Rcvd: [%d] fcc_new=%d\n", i, fcc_new);
i++;
return count;
}
static ssize_t fcc_data_get(struct device *dev, struct device_attribute *attr,
char *buf)
{
int count = 0;
struct pm8921_bms_chip *chip = dev_get_drvdata(dev);
if (battery_removed) {
pr_debug("Invalidate the fcc table\n");
invalidate_fcc(chip);
battery_removed = 0;
return count;
}
count = snprintf(buf, PAGE_SIZE, "%d", chip->fcc_new);
pr_debug("Sent: fcc_new=%d\n", chip->fcc_new);
return count;
}
static ssize_t fcc_temp_set(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
static int i;
int batt_temp = 0, rc;
struct pm8921_bms_chip *chip = dev_get_drvdata(dev);
i %= chip->max_fcc_learning_samples;
rc = sscanf(buf, "%d", &batt_temp);
if (rc != 1)
return -EINVAL;
chip->fcc_table[i].batt_temp = batt_temp;
chip->fcc_table[i].temp_real = batt_temp;
pr_debug("Rcvd: [%d] batt_temp=%d\n", i, batt_temp);
i++;
return count;
}
static ssize_t fcc_chgcyl_set(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
static int i;
int chargecycle = 0, rc;
struct pm8921_bms_chip *chip = dev_get_drvdata(dev);
i %= chip->max_fcc_learning_samples;
rc = sscanf(buf, "%d", &chargecycle);
if (rc != 1)
return -EINVAL;
chip->fcc_table[i].chargecycles = chargecycle;
pr_debug("Rcvd: [%d] chargecycle=%d\n", i, chargecycle);
i++;
return count;
}
static ssize_t fcc_list_get(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pm8921_bms_chip *chip = dev_get_drvdata(dev);
struct fcc_data *ft;
int i = 0, j, count = 0;
if (last_fcc_update_count < chip->max_fcc_learning_samples)
i = last_fcc_update_count;
else
i = chip->max_fcc_learning_samples;
for (j = 0; j < i; j++) {
ft = &chip->fcc_table[j];
count += snprintf(buf + count, PAGE_SIZE - count,
"%d %d %d %d %d\n", ft->fcc_new, ft->chargecycles,
ft->batt_temp, ft->fcc_real, ft->temp_real);
}
return count;
}
static DEVICE_ATTR(fcc_data, 0664, fcc_data_get, fcc_data_set);
static DEVICE_ATTR(fcc_temp, 0664, NULL, fcc_temp_set);
static DEVICE_ATTR(fcc_chgcyl, 0664, NULL, fcc_chgcyl_set);
static DEVICE_ATTR(fcc_list, 0664, fcc_list_get, NULL);
static struct attribute *fcc_attrs[] = {
&dev_attr_fcc_data.attr,
&dev_attr_fcc_temp.attr,
&dev_attr_fcc_chgcyl.attr,
&dev_attr_fcc_list.attr,
NULL
};
static const struct attribute_group fcc_attr_group = {
.attrs = fcc_attrs,
};
#define REG_SBI_CONFIG 0x04F
#define PAGE3_ENABLE_MASK 0x6
#define PROGRAM_REV_MASK 0x0F
#define PROGRAM_REV 0x9
static int read_ocv_trim(struct pm8921_bms_chip *chip)
{
int rc;
u8 reg, sbi_config;
rc = pm8xxx_readb(chip->dev->parent, REG_SBI_CONFIG, &sbi_config);
if (rc) {
pr_err("error = %d reading sbi config reg\n", rc);
return rc;
}
reg = sbi_config | PAGE3_ENABLE_MASK;
rc = pm8xxx_writeb(chip->dev->parent, REG_SBI_CONFIG, reg);
if (rc) {
pr_err("error = %d writing sbi config reg\n", rc);
return rc;
}
rc = pm8xxx_readb(chip->dev->parent, TEST_PROGRAM_REV, &reg);
if (rc)
pr_err("Error %d reading %d addr %d\n",
rc, reg, TEST_PROGRAM_REV);
pr_err("program rev reg is 0x%x\n", reg);
reg &= PROGRAM_REV_MASK;
/* If the revision is equal or higher do not adjust trim delta */
if (reg >= PROGRAM_REV) {
chip->amux_2_trim_delta = 0;
goto restore_sbi_config;
}
rc = pm8xxx_readb(chip->dev->parent, AMUX_TRIM_2, &reg);
if (rc) {
pr_err("error = %d reading trim reg\n", rc);
return rc;
}
pr_err("trim reg is 0x%x\n", reg);
chip->amux_2_trim_delta = abs(0x49 - reg);
pr_err("trim delta is %d\n", chip->amux_2_trim_delta);
restore_sbi_config:
rc = pm8xxx_writeb(chip->dev->parent, REG_SBI_CONFIG, sbi_config);
if (rc) {
pr_err("error = %d writing sbi config reg\n", rc);
return rc;
}
return 0;
}
static int __devinit pm8921_bms_probe(struct platform_device *pdev)
{
int rc = 0;
int vbatt;
struct pm8921_bms_chip *chip;
const struct pm8921_bms_platform_data *pdata
= pdev->dev.platform_data;
if (!pdata) {
pr_err("missing platform data\n");
return -EINVAL;
}
chip = kzalloc(sizeof(struct pm8921_bms_chip), GFP_KERNEL);
if (!chip) {
pr_err("Cannot allocate pm_bms_chip\n");
return -ENOMEM;
}
mutex_init(&chip->bms_output_lock);
mutex_init(&chip->last_ocv_uv_mutex);
chip->dev = &pdev->dev;
chip->r_sense_uohm = pdata->r_sense_uohm;
chip->v_cutoff = pdata->v_cutoff;
chip->max_voltage_uv = pdata->max_voltage_uv;
chip->chg_term_ua = pdata->chg_term_ua;
chip->batt_type = pdata->battery_type;
chip->rconn_mohm = pdata->rconn_mohm;
chip->start_percent = -EINVAL;
chip->end_percent = -EINVAL;
chip->last_cc_uah = INT_MIN;
chip->ocv_reading_at_100 = OCV_RAW_UNINITIALIZED;
chip->prev_last_good_ocv_raw = OCV_RAW_UNINITIALIZED;
chip->shutdown_soc_valid_limit = pdata->shutdown_soc_valid_limit;
chip->adjust_soc_low_threshold = pdata->adjust_soc_low_threshold;
chip->normal_voltage_calc_ms = pdata->normal_voltage_calc_ms;
chip->low_voltage_calc_ms = pdata->low_voltage_calc_ms;
chip->soc_calc_period = pdata->normal_voltage_calc_ms;
if (chip->adjust_soc_low_threshold >= 45)
chip->adjust_soc_low_threshold = 45;
chip->prev_pc_unusable = -EINVAL;
chip->soc_at_cv = -EINVAL;
chip->imax_ua = -EINVAL;
chip->ignore_shutdown_soc = pdata->ignore_shutdown_soc;
rc = set_battery_data(chip);
if (rc) {
pr_err("%s bad battery data %d\n", __func__, rc);
goto free_chip;
}
if (chip->pc_temp_ocv_lut == NULL) {
pr_err("temp ocv lut table is NULL\n");
rc = -EINVAL;
goto free_chip;
}
/* set defaults in the battery data */
if (chip->default_rbatt_mohm <= 0)
chip->default_rbatt_mohm = DEFAULT_RBATT_MOHMS;
chip->batt_temp_channel = pdata->bms_cdata.batt_temp_channel;
chip->vbat_channel = pdata->bms_cdata.vbat_channel;
chip->ref625mv_channel = pdata->bms_cdata.ref625mv_channel;
chip->ref1p25v_channel = pdata->bms_cdata.ref1p25v_channel;
chip->batt_id_channel = pdata->bms_cdata.batt_id_channel;
chip->revision = pm8xxx_get_revision(chip->dev->parent);
chip->enable_fcc_learning = pdata->enable_fcc_learning;
chip->min_fcc_learning_soc = pdata->min_fcc_learning_soc;
chip->min_fcc_ocv_pc = pdata->min_fcc_ocv_pc;
chip->max_fcc_learning_samples = pdata->max_fcc_learning_samples;
if (chip->enable_fcc_learning) {
if (!chip->min_fcc_learning_soc)
chip->min_fcc_learning_soc =
MIN_START_PERCENT_FOR_LEARNING;
if (!chip->min_fcc_ocv_pc)
chip->min_fcc_ocv_pc =
MIN_START_OCV_PERCENT_FOR_LEARNING;
if (!chip->max_fcc_learning_samples ||
chip->max_fcc_learning_samples > MAX_FCC_LEARNING_COUNT)
chip->max_fcc_learning_samples = MAX_FCC_LEARNING_COUNT;
max_fcc_cycles = chip->max_fcc_learning_samples;
chip->fcc_table = kzalloc(sizeof(struct fcc_data) *
chip->max_fcc_learning_samples, GFP_KERNEL);
if (!chip->fcc_table) {
pr_err("Unable to allocate table for fcc learning\n");
rc = -ENOMEM;
goto free_chip;
}
rc = sysfs_create_group(&pdev->dev.kobj, &fcc_attr_group);
if (rc) {
pr_err("Unable to create sysfs entries\n");
goto free_chip;
}
}
chip->disable_flat_portion_ocv = pdata->disable_flat_portion_ocv;
chip->ocv_dis_high_soc = pdata->ocv_dis_high_soc;
chip->ocv_dis_low_soc = pdata->ocv_dis_low_soc;
chip->high_ocv_correction_limit_uv
= pdata->high_ocv_correction_limit_uv;
chip->low_ocv_correction_limit_uv = pdata->low_ocv_correction_limit_uv;
chip->hold_soc_est = pdata->hold_soc_est;
chip->alarm_low_mv = pdata->alarm_low_mv;
chip->alarm_high_mv = pdata->alarm_high_mv;
chip->low_voltage_detect = pdata->low_voltage_detect;
chip->vbatt_cutoff_retries = pdata->vbatt_cutoff_retries;
mutex_init(&chip->calib_mutex);
INIT_WORK(&chip->calib_hkadc_work, calibrate_hkadc_work);
INIT_DELAYED_WORK(&chip->calculate_soc_delayed_work,
calculate_soc_work);
wake_lock_init(&chip->soc_wake_lock,
WAKE_LOCK_SUSPEND, "pm8921_soc_lock");
rc = request_irqs(chip, pdev);
if (rc) {
pr_err("couldn't register interrupts rc = %d\n", rc);
goto destroy_soc_wl;
}
wake_lock_init(&chip->low_voltage_wake_lock,
WAKE_LOCK_SUSPEND, "pm8921_bms_low");
rc = pm8921_bms_hw_init(chip);
if (rc) {
pr_err("couldn't init hardware rc = %d\n", rc);
goto free_irqs;
}
read_shutdown_soc_and_iavg(chip);
platform_set_drvdata(pdev, chip);
the_chip = chip;
create_debugfs_entries(chip);
rc = read_ocv_trim(chip);
if (rc) {
pr_err("couldn't adjust ocv_trim rc= %d\n", rc);
goto free_irqs;
}
check_initial_ocv(chip);
/* enable the vbatt reading interrupts for scheduling hkadc calib */
pm8921_bms_enable_irq(chip, PM8921_BMS_GOOD_OCV);
pm8921_bms_enable_irq(chip, PM8921_BMS_OCV_FOR_R);
rc = pm8921_bms_configure_batt_alarm(chip);
if (rc) {
pr_err("Couldn't configure battery alarm! rc=%d\n", rc);
goto free_irqs;
}
rc = pm8921_bms_enable_batt_alarm(chip);
if (rc) {
pr_err("Couldn't enable battery alarm! rc=%d\n", rc);
goto free_irqs;
}
calculate_soc_work(&(chip->calculate_soc_delayed_work.work));
rc = get_battery_uvolts(chip, &vbatt);
if (!rc)
pr_info("OK battery_capacity_at_boot=%d volt = %d ocv = %d\n",
pm8921_bms_get_percent_charge(),
vbatt, chip->last_ocv_uv);
else
pr_info("Unable to read battery voltage at boot\n");
return 0;
free_irqs:
wake_lock_destroy(&chip->low_voltage_wake_lock);
free_irqs(chip);
destroy_soc_wl:
wake_lock_destroy(&chip->soc_wake_lock);
free_chip:
kfree(chip);
return rc;
}
static int __devexit pm8921_bms_remove(struct platform_device *pdev)
{
struct pm8921_bms_chip *chip = platform_get_drvdata(pdev);
free_irqs(chip);
kfree(chip->adjusted_fcc_temp_lut);
platform_set_drvdata(pdev, NULL);
the_chip = NULL;
kfree(chip);
return 0;
}
static int pm8921_bms_suspend(struct device *dev)
{
struct pm8921_bms_chip *chip = dev_get_drvdata(dev);
cancel_delayed_work_sync(&chip->calculate_soc_delayed_work);
chip->last_soc_at_suspend = last_soc;
return 0;
}
static int pm8921_bms_resume(struct device *dev)
{
int rc;
unsigned long time_since_last_recalc;
unsigned long tm_now_sec;
struct pm8921_bms_chip *chip = dev_get_drvdata(dev);
rc = get_current_time(&tm_now_sec);
if (rc) {
pr_err("Could not read current time: %d\n", rc);
return 0;
}
if (tm_now_sec > chip->last_recalc_time) {
time_since_last_recalc = tm_now_sec -
chip->last_recalc_time;
pr_debug("Time since last recalc: %lu\n",
time_since_last_recalc);
if ((time_since_last_recalc * 1000) >=
chip->soc_calc_period) {
chip->last_recalc_time = tm_now_sec;
recalculate_soc(chip);
chip->soc_updated_on_resume = true;
}
}
chip->first_report_after_suspend = true;
update_power_supply(chip);
schedule_delayed_work(&chip->calculate_soc_delayed_work,
msecs_to_jiffies(chip->soc_calc_period));
return 0;
}
static const struct dev_pm_ops pm8921_bms_pm_ops = {
.resume = pm8921_bms_resume,
.suspend = pm8921_bms_suspend,
};
static struct platform_driver pm8921_bms_driver = {
.probe = pm8921_bms_probe,
.remove = __devexit_p(pm8921_bms_remove),
.driver = {
.name = PM8921_BMS_DEV_NAME,
.owner = THIS_MODULE,
.pm = &pm8921_bms_pm_ops,
},
};
static int __init pm8921_bms_init(void)
{
return platform_driver_register(&pm8921_bms_driver);
}
static void __exit pm8921_bms_exit(void)
{
platform_driver_unregister(&pm8921_bms_driver);
}
late_initcall(pm8921_bms_init);
module_exit(pm8921_bms_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("PMIC8921 bms driver");
MODULE_VERSION("1.0");
MODULE_ALIAS("platform:" PM8921_BMS_DEV_NAME);
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