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pca9468_charger.c
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pca9468_charger.c
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/*
* Driver for the NXP PCA9468 battery charger.
*
* Copyright (C) 2018 NXP Semiconductor.
* Copyright 2020 Google, LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/err.h>
#include <linux/version.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/of_irq.h>
#include <linux/of_device.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/regmap.h>
#include <linux/rtc.h>
#include <misc/gvotable.h>
#include "pca9468_regs.h"
#include "pca9468_charger.h"
#if defined (CONFIG_OF)
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#endif /* CONFIG_OF */
/* adc_gain bit[7:4] of reg 0x31 - 2's complement */
static int adc_gain[16] = { 0, 1, 2, 3, 4, 5, 6, 7,
-8, -7, -6, -5, -4, -3, -2, -1};
/* Timer definition */
#define PCA9468_VBATMIN_CHECK_T 1000 /* 1000ms */
#define PCA9468_CCMODE_CHECK1_T 5000 /* 10000ms -> 500ms */
#define PCA9468_CCMODE_CHECK2_T 5000 /* 5000ms */
#define PCA9468_CVMODE_CHECK_T 10000 /* 10000ms */
#define PCA9468_ENABLE_DELAY_T 150 /* 150ms */
#define PCA9468_CVMODE_CHECK2_T 1000 /* 1000ms */
#define PCA9468_ENABLE_WLC_DELAY_T 300 /* 300ms */
/* Battery Threshold */
#define PCA9468_DC_VBAT_MIN 3400000 /* uV */
/* Input Current Limit default value */
#define PCA9468_IIN_CFG_DFT 2500000 /* uA*/
/* Charging Float Voltage default value */
#define PCA9468_VFLOAT_DFT 4350000 /* uV */
/* Charging Sub Float Voltage default value */
#define PCA9468_VFLOAT_SUB_DFT 5000000 /* 5000000uV */
/* Charging Float Voltage max voltage for comp */
#define PCA9468_COMP_VFLOAT_MAX 4450000 /* uV */
/* Sense Resistance default value */
#define PCA9468_SENSE_R_DFT 1 /* 10mOhm */
/* Switching Frequency default value */
#define PCA9468_FSW_CFG_DFT 3 /* 980KHz */
/* NTC threshold voltage default value */
#define PCA9468_NTC_TH_DFT 0 /* uV*/
/* Charging Done Condition */
#define PCA9468_IIN_DONE_DFT 500000 /* uA */
/* parallel charging done conditoin */
#define PCA9468_IIN_P_DONE 1000000 /* uA */
/* Parallel charging default threshold */
#define PCA9468_IIN_P_TH_DFT 4000000 /* uA */
/* Single charging default threshold */
#define PCA9468_IIN_S_TH_DFT 10000000 /* uA */
/* Maximum TA voltage threshold */
#define PCA9468_TA_MAX_VOL 9800000 /* uV */
/* Maximum TA current threshold, set to max(cc_max) / 2 */
#define PCA9468_TA_MAX_CUR 2600000 /* uA */
/* Minimum TA current threshold */
#define PCA9468_TA_MIN_CUR 1000000 /* uA - PPS minimum current */
/* Minimum TA voltage threshold in Preset mode */
#define PCA9468_TA_MIN_VOL_PRESET 8000000 /* uV */
/* TA voltage threshold starting Adjust CC mode */
#define PCA9468_TA_MIN_VOL_CCADJ 8500000 /* 8000000uV --> 8500000uV */
#define PCA9468_TA_VOL_PRE_OFFSET 500000 /* uV */
/* Adjust CC mode TA voltage step */
#define PCA9468_TA_VOL_STEP_ADJ_CC 40000 /* uV */
/* Pre CV mode TA voltage step */
#define PCA9468_TA_VOL_STEP_PRE_CV 20000 /* uV */
/* IIN_CC adc offset for accuracy */
#define PCA9468_IIN_ADC_OFFSET 20000 /* uA */
/* IIN_CC compensation offset */
#define PCA9468_IIN_CC_COMP_OFFSET 50000 /* uA */
/* IIN_CC compensation offset in Power Limit Mode(Constant Power) TA */
#define PCA9468_IIN_CC_COMP_OFFSET_CP 20000 /* uA */
/* TA maximum voltage that can support CC in Constant Power Mode */
#define PCA9468_TA_MAX_VOL_CP 9800000 /* 9760000uV --> 9800000uV */
/* Offset for cc_max / 2 */
#define PCA9468_IIN_MAX_OFFSET 0
/* maximum retry counter for restarting charging */
#define PCA9468_MAX_RETRY_CNT 3 /* retries */
/* TA IIN tolerance */
#define PCA9468_TA_IIN_OFFSET 100000 /* uA */
/* IIN_CC upper protection offset in Power Limit Mode TA */
#define PCA9468_IIN_CC_UPPER_OFFSET 50000 /* 50mA */
/* PD Message Voltage and Current Step */
#define PD_MSG_TA_VOL_STEP 20000 /* uV */
#define PD_MSG_TA_CUR_STEP 50000 /* uA */
/* Maximum WCRX voltage threshold */
#define PCA9468_WCRX_MAX_VOL 9750000 /* uV */
/* WCRX voltage Step */
#define WCRX_VOL_STEP 100000 /* uV */
#define PCA9468_OTV_MARGIN 12000 /* uV */
/* irdrop default limit */
#define PCA9468_IRDROP_LIMIT_CNT 3 /* tiers */
#define PCA9468_IRDROP_LIMIT_TIER1 105000 /* uV */
#define PCA9468_IRDROP_LIMIT_TIER2 75000 /* uV */
#define PCA9468_IRDROP_LIMIT_TIER3 0 /* uV */
/* Spread Spectrum default settings */
#define PCA9468_SC_CLK_DITHER_RATE_DEF 0 /* 25kHz */
#define PCA9468_SC_CLK_DITHER_LIMIT_DEF 0xF /* 10% */
#define PCA9468_TIER_SWITCH_DELTA 25000 /* uV */
/* INT1 Register Buffer */
enum {
REG_INT1,
REG_INT1_MSK,
REG_INT1_STS,
REG_INT1_MAX
};
/* STS Register Buffer */
enum {
REG_STS_A,
REG_STS_B,
REG_STS_C,
REG_STS_D,
REG_STS_MAX
};
/* Status */
enum {
STS_MODE_CHG_LOOP, /* TODO: There is no such thing */
STS_MODE_VFLT_LOOP,
STS_MODE_IIN_LOOP,
STS_MODE_LOOP_INACTIVE,
STS_MODE_CHG_DONE,
STS_MODE_VIN_UVLO,
};
/* Timer ID */
enum {
TIMER_ID_NONE,
TIMER_VBATMIN_CHECK,
TIMER_PRESET_DC,
TIMER_PRESET_CONFIG,
TIMER_CHECK_ACTIVE,
TIMER_ADJUST_CCMODE,
TIMER_CHECK_CCMODE,
TIMER_ENTER_CVMODE,
TIMER_CHECK_CVMODE, /* 8 */
TIMER_PDMSG_SEND, /* 9 */
TIMER_ADJUST_TAVOL,
TIMER_ADJUST_TACUR,
};
/* TA increment Type */
enum {
INC_NONE, /* No increment */
INC_TA_VOL, /* TA voltage increment */
INC_TA_CUR, /* TA current increment */
};
/* BATT info Type */
enum {
BATT_CURRENT,
BATT_VOLTAGE,
};
/* IIN offset as the switching frequency in uA*/
static int iin_fsw_cfg[16] = { 9990, 10540, 11010, 11520, 12000, 12520, 12990,
13470, 5460, 6050, 6580, 7150, 7670, 8230, 8720,
9260};
/* ------------------------------------------------------------------------ */
/* ADC Read function, return uV or uA */
int pca9468_read_adc(const struct pca9468_charger *pca9468, u8 adc_ch)
{
u8 reg_data[2];
u16 raw_adc = 0;
int conv_adc = -1;
int ret;
switch (adc_ch) {
case ADCCH_VOUT:
/* ~PCA9468_BIT_CH1_EN, PCA9468_REG_ADC_CFG, udelay(120) us */
ret = regmap_bulk_read(pca9468->regmap, PCA9468_REG_STS_ADC_4,
reg_data, 2);
if (ret < 0) {
conv_adc = ret;
goto error;
}
raw_adc = ((reg_data[1] & PCA9468_BIT_ADC_VOUT9_2) << 2) |
((reg_data[0] & PCA9468_BIT_ADC_VOUT1_0) >> 6);
conv_adc = raw_adc * VOUT_STEP; /* unit - uV */
break;
case ADCCH_VIN:
/* ~PCA9468_BIT_CH2_EN, PCA9468_REG_ADC_CFG, udelay(120) us */
ret = regmap_bulk_read(pca9468->regmap, PCA9468_REG_STS_ADC_3,
reg_data, 2);
if (ret < 0) {
conv_adc = ret;
goto error;
}
raw_adc = ((reg_data[1] & PCA9468_BIT_ADC_VIN9_4) << 4) |
((reg_data[0] & PCA9468_BIT_ADC_VIN3_0) >> 4);
conv_adc = raw_adc * VIN_STEP; /* unit - uV */
break;
case ADCCH_VBAT:
/* ~PCA9468_BIT_CH3_EN, PCA9468_REG_ADC_CFG, udelay(120) us */
ret = regmap_bulk_read(pca9468->regmap, PCA9468_REG_STS_ADC_6,
reg_data, 2);
if (ret < 0) {
conv_adc = ret;
goto error;
}
raw_adc = ((reg_data[1] & PCA9468_BIT_ADC_VBAT9_8) << 8) |
((reg_data[0] & PCA9468_BIT_ADC_VBAT7_0) >> 0);
conv_adc = raw_adc * VBAT_STEP; /* unit - uV */
break;
case ADCCH_IIN:
/* ~PCA9468_BIT_CH5_EN, PCA9468_REG_ADC_CFG, udelay(120) us */
ret = regmap_bulk_read(pca9468->regmap, PCA9468_REG_STS_ADC_1,
reg_data, 2);
if (ret < 0) {
conv_adc = ret;
goto error;
}
raw_adc = ((reg_data[1] & PCA9468_BIT_ADC_IIN9_8) << 8) |
((reg_data[0] & PCA9468_BIT_ADC_IIN7_0) >> 0);
/*
* iin = rawadc*4.89 + (rawadc*4.89 - 900) *
* adc_comp_gain/100
*/
conv_adc = raw_adc * IIN_STEP + (raw_adc * IIN_STEP -
ADC_IIN_OFFSET) * pca9468->adc_comp_gain /
100; /* unit - uA */
/*
* If ADC raw value is 0, convert value will be minus value
* because of compensation gain, so in this case conv_adc
* is 0
*/
if (conv_adc < 0)
conv_adc = 0;
break;
case ADCCH_DIETEMP:
/* ~PCA9468_BIT_CH6_EN, PCA9468_REG_ADC_CFG, udelay(120) us */
ret = regmap_bulk_read(pca9468->regmap, PCA9468_REG_STS_ADC_7,
reg_data, 2);
if (ret < 0) {
conv_adc = ret;
goto error;
}
raw_adc = ((reg_data[1] & PCA9468_BIT_ADC_DIETEMP9_6) << 6) |
((reg_data[0] & PCA9468_BIT_ADC_DIETEMP5_0) >> 2);
/* Temp = (935-rawadc)*0.435, unit - C */
conv_adc = (935 - raw_adc) * DIETEMP_STEP / DIETEMP_DENOM;
if (conv_adc > DIETEMP_MAX)
conv_adc = DIETEMP_MAX;
else if (conv_adc < DIETEMP_MIN)
conv_adc = DIETEMP_MIN;
break;
case ADCCH_NTC:
/* ~PCA9468_BIT_CH7_EN, PCA9468_REG_ADC_CFG, udelay(120) us */
ret = regmap_bulk_read(pca9468->regmap, PCA9468_REG_STS_ADC_8,
reg_data, 2);
if (ret < 0) {
conv_adc = ret;
goto error;
}
raw_adc = ((reg_data[1] & PCA9468_BIT_ADC_NTCV9_4) << 4) |
((reg_data[0] & PCA9468_BIT_ADC_NTCV3_0) >> 4);
/* Temp = (rawadc < 185)? (960-rawadc/4) : (730-rawadc/8) */
/* unit: 0.1 degree C */
if (raw_adc < NTC_CURVE_THRESHOLD)
conv_adc = NTC_CURVE_1_BASE - ((raw_adc * 10) >> NTC_CURVE_1_SHIFT);
else
conv_adc = NTC_CURVE_2_BASE - ((raw_adc * 10) >> NTC_CURVE_2_SHIFT);
break;
default:
conv_adc = -EINVAL;
break;
}
error:
/* if disabled a channel, re-enable it in -> PCA9468_REG_ADC_CFG */
pr_debug("%s: adc_ch=%u, raw_adc=%x convert_val=%d\n", __func__,
adc_ch, raw_adc, conv_adc);
return conv_adc;
}
/* v float voltage (5 mV) resolution */
static int pca9468_set_vfloat(struct pca9468_charger *pca9468,
unsigned int v_float)
{
const int val = PCA9468_V_FLOAT(v_float);
int ret;
ret = regmap_write(pca9468->regmap, PCA9468_REG_V_FLOAT, val);
dev_info(pca9468->dev, "%s: v_float=%u (%d)\n", __func__, v_float, ret);
return ret;
}
static int pca9468_set_input_current(struct pca9468_charger *pca9468,
unsigned int iin)
{
int ret, val;
/* round-up and increase one step */
iin = iin + PD_MSG_TA_CUR_STEP;
val = PCA9468_IIN_CFG(iin);
/* Set IIN_CFG to one step higher */
val = val + 1;
if (val > 0x32)
val = 0x32; /* maximum value is 5A */
ret = regmap_update_bits(pca9468->regmap, PCA9468_REG_IIN_CTRL,
PCA9468_BIT_IIN_CFG, val);
dev_info(pca9468->dev, "%s: iin=%d real iin_cfg=%d (%d)\n", __func__,
iin, val * PCA9468_IIN_CFG_STEP, ret);
return ret;
}
/* Returns the enable or disable value. into 1 or 0. */
static int pca9468_get_charging_enabled(struct pca9468_charger *pca9468)
{
int ret, intval;
unsigned int val;
ret = regmap_read(pca9468->regmap, PCA9468_REG_START_CTRL, &val);
if (ret < 0)
return ret;
intval = (val & PCA9468_BIT_STANDBY_EN) ? 0 : 1;
return intval;
}
/* b/194346461 ramp down IIN */
static int pca9468_wlc_ramp_down_iin(struct pca9468_charger *pca9468,
struct power_supply *wlc_psy)
{
const int ramp_down_step = PCA9468_IIN_CFG_STEP;
int ret = 0, iin;
if (!pca9468->wlc_ramp_out_iin)
return 0;
iin = pca9468_input_current_limit(pca9468);
for ( ; iin >= PCA9468_IIN_CFG_MIN; iin -= ramp_down_step) {
int iin_adc, wlc_iout = -1;
iin_adc = pca9468_read_adc(pca9468, ADCCH_IIN);
if (wlc_psy) {
union power_supply_propval pro_val;
ret = power_supply_get_property(wlc_psy,
POWER_SUPPLY_PROP_ONLINE,
&pro_val);
if (ret < 0 || pro_val.intval != PPS_PSY_PROG_ONLINE)
break;
ret = power_supply_get_property(wlc_psy,
POWER_SUPPLY_PROP_CURRENT_NOW,
&pro_val);
if (ret == 0)
wlc_iout = pro_val.intval;
}
ret = pca9468_set_input_current(pca9468, iin);
if (ret < 0) {
pr_err("%s: ramp down iin=%d (%d)\n", __func__,
iin, ret);
break;
}
pr_debug("%s: iin_adc=%d, wlc_iout-%d ramp down iin=%d\n",
__func__, iin_adc, wlc_iout, iin);
msleep(pca9468->wlc_ramp_out_delay);
}
return ret;
}
/* b/194346461 ramp down VOUT */
#define WLC_VOUT_CFG_STEP 40000
/* the caller will set to vbatt * 4 */
static int pca9468_wlc_ramp_down_vout(struct pca9468_charger *pca9468,
struct power_supply *wlc_psy)
{
const int ramp_down_step = WLC_VOUT_CFG_STEP;
union power_supply_propval pro_val;
int vout = 0, vout_target = pca9468->wlc_ramp_out_vout_target;
int ret, vbatt;
while (true) {
vbatt = pca9468_read_adc(pca9468, ADCCH_VBAT);
if (vbatt <= 0) {
pr_err("%s: invalid vbatt %d\n", __func__, vbatt);
break;
}
ret = power_supply_get_property(wlc_psy, POWER_SUPPLY_PROP_VOLTAGE_NOW,
&pro_val);
if (ret < 0) {
pr_err("%s: invalid vout %d\n", __func__, ret);
break;
}
if (!pca9468->wlc_ramp_out_vout_target)
vout_target = vbatt * 4;
if (!vout)
vout = pro_val.intval;
if (vout < vout_target) {
pr_debug("%s: underflow vout=%d, vbatt=%d (target=%d)\n", __func__,
vout, vbatt, vout_target);
return 0;
}
pro_val.intval = vout - ramp_down_step;
pr_debug("%s: vbatt=%d, wlc_vout=%d->%d\n", __func__, vbatt,
vout, pro_val.intval);
ret = power_supply_set_property(wlc_psy, POWER_SUPPLY_PROP_VOLTAGE_NOW,
&pro_val);
if (ret < 0) {
pr_err("%s: cannot set vout %d\n", __func__, ret);
break;
}
msleep(pca9468->wlc_ramp_out_delay);
vout = pro_val.intval;
}
return -EIO;
}
/* call holding mutex_lock(&pca9468->lock); */
static int pca9468_set_charging(struct pca9468_charger *pca9468, bool enable)
{
const int ntc_protection_en = 0; /* TODO: DT option? */
int ret, val;
pr_debug("%s: enable=%d ta_type=%d\n", __func__, enable, pca9468->ta_type);
if (enable && pca9468_get_charging_enabled(pca9468) == enable) {
pr_debug("%s: no op, already enabled\n", __func__);
return 0;
}
/* might needs to disable NTC_PROTECTION_EN in all cases */
if (enable) {
/* Improve adc */
val = 0x5B;
ret = regmap_write(pca9468->regmap, PCA9468_REG_ADC_ACCESS, val);
if (ret < 0)
goto error;
ret = regmap_update_bits(pca9468->regmap, PCA9468_REG_ADC_IMPROVE,
PCA9468_BIT_ADC_IIN_IMP, 0);
if (ret < 0)
goto error;
/* For fixing input current error */
/* Overwrite 0x00 in 0x41 register */
val = 0x00;
ret = regmap_write(pca9468->regmap, 0x41, val);
if (ret < 0)
goto error;
/* Overwrite 0x01 in 0x43 register */
val = 0x01;
ret = regmap_write(pca9468->regmap, 0x43, val);
if (ret < 0)
goto error;
/* Overwrite 0x00 in 0x4B register */
val = 0x00;
ret = regmap_write(pca9468->regmap, 0x4B, val);
if (ret < 0)
goto error;
/* End for fixing input current error */
} else {
/* Disable NTC_PROTECTION_EN */
ret = regmap_update_bits(pca9468->regmap, PCA9468_REG_TEMP_CTRL,
PCA9468_BIT_NTC_PROTECTION_EN, 0);
}
if (enable) {
/* ENABLE PCA9468 */
ret = regmap_update_bits(pca9468->regmap, PCA9468_REG_START_CTRL,
PCA9468_BIT_STANDBY_EN,
PCA9468_STANDBY_DONOT);
if (ret < 0)
goto error;
/* Wait 50ms, first to keep the start-up sequence */
mdelay(50);
/* Wait 150ms */
msleep(150);
/* Improve ADC */
ret = regmap_update_bits(pca9468->regmap,
PCA9468_REG_ADC_IMPROVE,
PCA9468_BIT_ADC_IIN_IMP,
PCA9468_BIT_ADC_IIN_IMP);
if (ret < 0)
goto error;
val = 0x00;
ret = regmap_write(pca9468->regmap, PCA9468_REG_ADC_ACCESS,
val);
/* Restore NTC_PROTECTION_EN */
ret = regmap_update_bits(pca9468->regmap, PCA9468_REG_TEMP_CTRL,
PCA9468_BIT_NTC_PROTECTION_EN,
ntc_protection_en);
} else {
if (pca9468->ta_type == TA_TYPE_WIRELESS) {
struct power_supply *wlc_psy;
int ret;
wlc_psy = pca9468_get_rx_psy(pca9468);
if (wlc_psy) {
ret = pca9468_wlc_ramp_down_iin(pca9468, wlc_psy);
if (ret < 0)
dev_err(pca9468->dev, "cannot ramp out iin (%d)\n", ret);
ret = pca9468_wlc_ramp_down_vout(pca9468, wlc_psy);
if (ret < 0)
dev_err(pca9468->dev, "cannot ramp out vout (%d)\n", ret);
}
}
/* turn off the PCA */
ret = regmap_update_bits(pca9468->regmap, PCA9468_REG_START_CTRL,
PCA9468_BIT_STANDBY_EN,
PCA9468_STANDBY_FORCED);
if (ret < 0)
goto error;
/* Wait 5ms to keep the shutdown sequence */
mdelay(5);
}
error:
pr_debug("%s: End, ret=%d\n", __func__, ret);
return ret;
}
static int pca9468_check_state(u8 val[8], struct pca9468_charger *pca9468, int loglevel)
{
int ret;
/* Dump register */
ret = regmap_bulk_read(pca9468->regmap, PCA9468_REG_INT1,
&val[PCA9468_REG_INT1], 7);
if (ret < 0)
return ret;
logbuffer_prlog(pca9468, loglevel,
"%s: Error reg[1]=%#x,[2]=%#x,[3]=%#x,[4]=%#x,[5]=%#x,[6]=%#x,[7]=%#x",
__func__, val[1], val[2], val[3], val[4], val[5], val[6], val[7]);
return 0;
}
static void pca9468_dump_test_debug(const struct pca9468_charger *pca9468,
int loglevel)
{
u8 test_val[16];
int ret, vin, vout, vbat;
/* Read test register for debugging */
ret = regmap_bulk_read(pca9468->regmap, 0x40, test_val, 16);
if (ret < 0) {
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: cannot read test registers (%d)\n",
__func__, ret);
} else {
logbuffer_prlog(pca9468, loglevel,
"%s: Error reg[0x40]=%#x,[0x41]=%#x,[0x42]=%#x,[0x43]=%#x,[0x44]=%#x,[0x45]=%#x,[0x46]=%#x,[0x47]=%#x",
__func__, test_val[0], test_val[1], test_val[2], test_val[3],
test_val[4], test_val[5], test_val[6], test_val[7]);
logbuffer_prlog(pca9468, loglevel,
"%s: Error reg[0x48]=%#x,[0x49]=%#x,[0x4A]=%#x,[0x4B]=%#x,[0x4C]=%#x,[0x4D]=%#x,[0x4E]=%#x,[0x4F]=%#x",
__func__, test_val[8], test_val[9], test_val[10], test_val[11],
test_val[12], test_val[13], test_val[14], test_val[15]);
}
vin = pca9468_read_adc(pca9468, ADCCH_VIN);
vout = pca9468_read_adc(pca9468, ADCCH_VOUT);
vbat = pca9468_read_adc(pca9468, ADCCH_VBAT);
logbuffer_prlog(pca9468, loglevel, "%s: vin: %d, vout: %d, vbat: %d\n",
__func__, vin, vout, vbat);
}
static void pca9468_dump_config(const struct pca9468_charger *pca9468,
int loglevel)
{
u8 val[10];
int ret;
ret = regmap_bulk_read(pca9468->regmap, PCA9468_REG_IIN_CTRL,
val, sizeof(val));
if (ret < 0) {
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: cannot read config (%d)\n", __func__, ret);
} else {
logbuffer_prlog(pca9468, loglevel,
"%s: Config reg[0x21]=%#x,[0x22]=%#x,[0x23]=%#x,[0x24]=%#x,[0x25]=%#x,[0x26]=%#x,[0x27]=%#x,[0x28]=%#x,[0x29]=%#x,[0x2A]=%#x",
__func__, val[0], val[1], val[2], val[3], val[4],
val[5], val[6], val[7], val[8], val[9]);
}
}
/* PCA9468 is not active state - standby or shutdown */
/* Stop charging in timer_work */
/* return 0 when no error is detected */
static int pca9468_check_not_active(struct pca9468_charger *pca9468)
{
u8 val[8];
int ret;
ret = pca9468_check_state(val, pca9468, LOGLEVEL_WARNING);
if (ret < 0) {
pr_err("%s: cannot read state\n", __func__);
return ret;
}
pca9468_dump_test_debug(pca9468, LOGLEVEL_ERR);
/* Check INT1_STS first */
if ((val[PCA9468_REG_INT1_STS] & PCA9468_BIT_V_OK_STS) != PCA9468_BIT_V_OK_STS) {
/* VBUS is invalid */
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: VOK is invalid", __func__);
/* Check STS_A. NOTE: V_OV_TRACKING is with VIN OV */
if (val[PCA9468_REG_STS_A] & PCA9468_BIT_CFLY_SHORT_STS)
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: Flying Cap is shorted to GND", __func__);
else if (val[PCA9468_REG_STS_A] & PCA9468_BIT_VOUT_UV_STS)
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: VOUT UV", __func__); /* VOUT < VOUT_OK */
else if (val[PCA9468_REG_STS_A] & PCA9468_BIT_VBAT_OV_STS)
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: VBAT OV", __func__); /* VBAT > VBAT_OV */
else if (val[PCA9468_REG_STS_A] & PCA9468_BIT_VIN_OV_STS)
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: VIN OV", __func__); /* VIN > V_OV_FIXED */
else if (val[PCA9468_REG_STS_A] & PCA9468_BIT_VIN_UV_STS)
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: VIN UV", __func__); /* VIN < V_UVTH */
else
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: Invalid VIN or VOUT", __func__);
return -EINVAL;
}
if (val[PCA9468_REG_INT1_STS] & PCA9468_BIT_NTC_TEMP_STS) {
int ntc_adc, ntc_th; /* NTC protection */
u8 reg_data[2]; /* NTC threshold */
ret = regmap_bulk_read(pca9468->regmap, PCA9468_REG_NTC_TH_1,
reg_data, sizeof(reg_data));
if (ret < 0)
return -EIO;
ntc_th = ((reg_data[1] & PCA9468_BIT_NTC_THRESHOLD9_8) << 8) |
reg_data[0]; /* uV unit */
/* Read NTC ADC */
ntc_adc = pca9468_read_adc(pca9468, ADCCH_NTC); /* uV unit */
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: NTC Protection, NTC_TH=%d(uV), NTC_ADC=%d(uV)",
__func__, ntc_th, ntc_adc);
return -EINVAL;
}
if (val[PCA9468_REG_INT1_STS] & PCA9468_BIT_CTRL_LIMIT_STS) {
/* OCP event happens */
if (val[PCA9468_REG_STS_B] & PCA9468_BIT_OCP_FAST_STS)
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: IIN is over OCP_FAST", __func__);
else if (val[PCA9468_REG_STS_B] & PCA9468_BIT_OCP_AVG_STS)
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: IIN is over OCP_AVG", __func__);
else
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: No Loop active", __func__);
return -EINVAL;
}
if (val[PCA9468_REG_INT1_STS] & PCA9468_BIT_TEMP_REG_STS) {
/* Over temperature protection */
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: Device is in temperature regulation", __func__);
return -EINVAL;
}
if (val[PCA9468_REG_INT1_STS] & PCA9468_BIT_TIMER_STS) {
const u8 sts_b = val[PCA9468_REG_STS_B];
if (sts_b & PCA9468_BIT_CHARGE_TIMER_STS)
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: Charger timer is expired", __func__);
else if (sts_b & PCA9468_BIT_WATCHDOG_TIMER_STS)
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: Watchdog timer is expired", __func__);
else
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: Timer INT, but no timer STS", __func__);
return -EINVAL;
}
if (val[PCA9468_REG_STS_A] & PCA9468_BIT_CFLY_SHORT_STS) {
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: Flying Cap is shorted to GND", __func__);
return -EINVAL;
}
return 0;
}
/* Keep the current charging state, check STS_B again */
/* return 0 if VIN is still present, -EAGAIN if needs to retry, -EINVAL oth */
static int pca9468_check_standby(struct pca9468_charger *pca9468)
{
unsigned int reg_val;
int ret;
u8 val[8];
/* re-read the state register */
ret = regmap_read(pca9468->regmap, PCA9468_REG_STS_B, ®_val);
if (ret < 0)
return -EIO;
pr_debug("%s: RCP check, STS_B=%#x\n", __func__, reg_val);
/* RCP condition, but VIN is valid and the PCA is active */
if (reg_val & PCA9468_BIT_ACTIVE_STATE_STS) {
const int charging_state = pca9468->charging_state;
/*
* Try again when called from pca9468_check_active_state().
* If VIN is increased, input current will increase over
* IIN_LOW level.
*/
logbuffer_prlog(pca9468, charging_state == DC_STATE_CHECK_ACTIVE ?
LOGLEVEL_WARNING : LOGLEVEL_ERR,
"%s: RCP triggered but VIN is valid, state=%d",
__func__, charging_state);
pca9468->chg_data.rcp_count++;
return -EAGAIN;
}
/* re-read and dump state, debug registers */
pca9468_check_state(val, pca9468, LOGLEVEL_INFO);
ret = regmap_bulk_read(pca9468->regmap, 0x48, val, 3);
logbuffer_prlog(pca9468, LOGLEVEL_ERR,
"%s: Error reg[0x48]=%#x,[0x49]=%#x,[0x4a]=%#x",
__func__, val[0], val[1], val[2]);
pca9468_dump_config(pca9468, LOGLEVEL_INFO);
/* Not in RCP state, retry only when DC is starting */
if (reg_val & PCA9468_BIT_STANDBY_STATE_STS) {
logbuffer_prlog(pca9468, LOGLEVEL_WARNING, "%s: device in standby", __func__);
pca9468->chg_data.stby_count++;
ret = -EAGAIN;
} else {
logbuffer_prlog(pca9468, LOGLEVEL_ERR, "%s: device in shutdown", __func__);
p9468_chg_stats_update_flags(&pca9468->chg_data, P9468_CHGS_F_SHDN);
ret = -EINVAL;
}
return ret;
}
/*
* Check Active status, 0 is active (or in RCP), <0 indicates a problem.
* The function is called from different contexts/functions, errors are fatal
* (i.e. stop charging) from all contexts except when this is called from
* pca9468_check_active_state().
*
* Other contexts:
* . pca9468_charge_adjust_ccmode
* . pca9468_charge_ccmode
* . pca9468_charge_start_cvmode
* . pca9468_charge_cvmode
*
* call holding mutex_lock(&pca9468->lock)
*/
static int pca9468_check_error(struct pca9468_charger *pca9468)
{
unsigned int reg_val;
int ret;
ret = regmap_read(pca9468->regmap, PCA9468_REG_STS_B, ®_val);
if (ret < 0)
goto error;
/* PCA9468 is active state */
if (reg_val & PCA9468_BIT_ACTIVE_STATE_STS) {
int vbatt;
/* PCA9468 is charging */
/* Check whether the battery voltage is over the minimum */
vbatt = pca9468_read_adc(pca9468, ADCCH_VBAT);
if (vbatt > PCA9468_DC_VBAT_MIN) {
/* Normal charging battery level */
/* Check temperature regulation loop */
/* Read INT1_STS register */
ret = regmap_read(pca9468->regmap, PCA9468_REG_INT1_STS,
®_val);
if (ret < 0) {
pr_err("%s: cannot read status (%d)\n", __func__, ret);
} else if (reg_val & PCA9468_BIT_TEMP_REG_STS) {
/* Over temperature protection */
pr_err("%s: Device is in temperature regulation\n",
__func__);
ret = -EINVAL;
}
} else {
/* Abnormal battery level */
pr_err("%s: Error abnormal battery voltage=%d\n",
__func__, vbatt);
ret = -EINVAL;
}
pr_debug("%s: Active Status ok=%d (ret=%d)\n", __func__,
ret == 0, ret);
return ret;
}
/* not in error but in standby or shutdown */
ret = pca9468_check_not_active(pca9468);
if (ret < 0) {
/* There was an error, done... */
} else if ((reg_val & PCA9468_BIT_STANDBY_STATE_STS) == 0) {
/* PCA9468 is in shutdown state */
pr_err("%s: PCA9468 is in shutdown\n", __func__);
ret = -EINVAL;
} else if (pca9468->charging_state == DC_STATE_NO_CHARGING) {
/*
* Sometimes battery driver might call set_property function
* to stop charging during msleep. At this case, charging
* state would change DC_STATE_NO_CHARGING. PCA9468 should
* stop checking RCP condition and exit timer_work
*/
pr_err("%s: other driver forced stop\n", __func__);
ret = -EINVAL;
} else {
/* Check the RCP condition, T_REVI_DET is 300ms */
msleep(200);
/*
* return 0 if VIN is still present, -EAGAIN if needs to retry,
* -EINVAL on error.
*/
ret = pca9468_check_standby(pca9468);
}
error:
pr_debug("%s: Not Active Status=%d\n", __func__, ret);
return ret;
}
static int pca9468_get_iin(struct pca9468_charger *pca9468, int *iin)
{
const int offset = iin_fsw_cfg[pca9468->pdata->fsw_cfg];
int temp;
temp = pca9468_read_adc(pca9468, ADCCH_IIN);
if (temp < 0)
return temp;
if (temp < offset)
temp = offset;
*iin = (temp - offset) * 2;
return 0;
}
/* only needed for irdrop compensation ane maybe not even that... */
static int pca9468_get_batt_info(struct pca9468_charger *pca9468, int info_type, int *info)
{
union power_supply_propval val;
enum power_supply_property psp;
int ret;
if (!pca9468->batt_psy)
pca9468->batt_psy = power_supply_get_by_name("battery");
if (!pca9468->batt_psy)
return -EINVAL;
if (info_type == BATT_CURRENT)
psp = POWER_SUPPLY_PROP_CURRENT_NOW;
else
psp = POWER_SUPPLY_PROP_VOLTAGE_NOW;
ret = power_supply_get_property(pca9468->batt_psy, psp, &val);
if (ret == 0)
*info = val.intval;
return ret;
}
/* only needed for irdrop compensation ane maybe not even that... */
static int pca9468_get_ibatt(struct pca9468_charger *pca9468, int *info)
{
return pca9468_get_batt_info(pca9468, BATT_CURRENT, info);
}
static void pca9468_prlog_state(struct pca9468_charger *pca9468, const char *fn)
{
int rc, ibat, icn = -EINVAL, iin = -EINVAL;
bool ovc_flag;
rc = pca9468_get_ibatt(pca9468, &ibat);
if (rc == 0)
rc = pca9468_get_iin(pca9468, &icn);
if (rc == 0)
iin = pca9468_read_adc(pca9468, ADCCH_IIN);
ovc_flag = ibat > pca9468->cc_max;
if (ovc_flag)
p9468_chg_stats_inc_ovcf(&pca9468->chg_data, ibat, pca9468->cc_max);;
logbuffer_prlog(pca9468, ovc_flag ? LOGLEVEL_WARNING : LOGLEVEL_DEBUG,
"%s: iin=%d, iin_cc=%d, icn=%d ibat=%d, cc_max=%d rc=%d",
fn, iin, pca9468->iin_cc, icn, ibat, pca9468->cc_max, rc);
}
static int pca9468_read_status(struct pca9468_charger *pca9468)
{
unsigned int reg_val;