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rockbox/firmware/drivers/axp-pmu.c
Aidan MacDonald c62c323ebc axp-pmu: adc refactor 
Remove the battery power ADC since it's not used right now,
and seems to fluctuate too rapidly to be of much use.

Change-Id: If115e4e3ce14d4c18ce899f5a889f7f99ab66489
2022-01-09 20:12:41 +00:00

550 lines
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2021 Aidan MacDonald
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "axp-pmu.h"
#include "power.h"
#include "system.h"
#include "i2c-async.h"
#include <string.h>
/* Headers for the debug menu */
#ifndef BOOTLOADER
# include "action.h"
# include "list.h"
# include <stdio.h>
#endif
struct axp_adc_info {
uint8_t reg;
uint8_t en_reg;
uint8_t en_bit;
int8_t num;
int8_t den;
};
struct axp_supply_info {
uint8_t volt_reg;
uint8_t volt_reg_mask;
uint8_t en_reg;
uint8_t en_bit;
int min_mV;
int max_mV;
int step_mV;
};
static const struct axp_adc_info axp_adc_info[NUM_ADC_CHANNELS] = {
[ADC_ACIN_VOLTAGE] = {0x56, AXP_REG_ADCENABLE1, 1 << 5, 17, 10},
[ADC_ACIN_CURRENT] = {0x58, AXP_REG_ADCENABLE1, 1 << 4, 5, 8},
[ADC_VBUS_VOLTAGE] = {0x5a, AXP_REG_ADCENABLE1, 1 << 3, 17, 10},
[ADC_VBUS_CURRENT] = {0x5c, AXP_REG_ADCENABLE1, 1 << 2, 3, 8},
[ADC_INTERNAL_TEMP] = {0x5e, AXP_REG_ADCENABLE2, 1 << 7, 0, 0},
[ADC_TS_INPUT] = {0x62, AXP_REG_ADCENABLE1, 1 << 1, 4, 5},
[ADC_BATTERY_VOLTAGE] = {0x78, AXP_REG_ADCENABLE1, 1 << 7, 11, 10},
[ADC_CHARGE_CURRENT] = {0x7a, AXP_REG_ADCENABLE1, 1 << 6, 1, 2},
[ADC_DISCHARGE_CURRENT] = {0x7c, AXP_REG_ADCENABLE1, 1 << 6, 1, 2},
[ADC_APS_VOLTAGE] = {0x7e, AXP_REG_ADCENABLE1, 1 << 1, 7, 5},
};
static const struct axp_supply_info axp_supply_info[AXP_NUM_SUPPLIES] = {
#if HAVE_AXP_PMU == 192
[AXP_SUPPLY_DCDC1] = {
.volt_reg = 0x26,
.volt_reg_mask = 0x7f,
.en_reg = 0x12,
.en_bit = 0,
.min_mV = 700,
.max_mV = 3500,
.step_mV = 25,
},
[AXP_SUPPLY_DCDC2] = {
.volt_reg = 0x23,
.volt_reg_mask = 0x3f,
.en_reg = 0x10,
.en_bit = 0,
.min_mV = 700,
.max_mV = 2275,
.step_mV = 25,
},
[AXP_SUPPLY_DCDC3] = {
.volt_reg = 0x27,
.volt_reg_mask = 0x7f,
.en_reg = 0x12,
.en_bit = 1,
.min_mV = 700,
.max_mV = 3500,
.step_mV = 25,
},
/*
* NOTE: LDO1 is always on, and we can't query it or change voltages
*/
[AXP_SUPPLY_LDO2] = {
.volt_reg = 0x28,
.volt_reg_mask = 0xf0,
.en_reg = 0x12,
.en_bit = 2,
.min_mV = 1800,
.max_mV = 3300,
.step_mV = 100,
},
[AXP_SUPPLY_LDO3] = {
.volt_reg = 0x28,
.volt_reg_mask = 0x0f,
.en_reg = 0x12,
.en_bit = 3,
.min_mV = 1800,
.max_mV = 3300,
.step_mV = 100,
},
[AXP_SUPPLY_LDO_IO0] = {
.volt_reg = 0x91,
.volt_reg_mask = 0xf0,
.en_reg = 0x90,
.en_bit = 0xff, /* this one requires special handling */
.min_mV = 1800,
.max_mV = 3300,
.step_mV = 100,
},
#else
# error "Untested AXP chip"
#endif
};
void axp_init(void)
{
}
void axp_supply_set_voltage(int supply, int voltage)
{
const struct axp_supply_info* info = &axp_supply_info[supply];
if(info->volt_reg == 0 || info->volt_reg_mask == 0)
return;
if(voltage > 0 && info->step_mV != 0) {
if(voltage < info->min_mV || voltage > info->max_mV)
return;
int regval = (voltage - info->min_mV) / info->step_mV;
i2c_reg_modify1(AXP_PMU_BUS, AXP_PMU_ADDR, info->volt_reg,
info->volt_reg_mask, regval, NULL);
}
if(info->en_bit != 0xff) {
i2c_reg_setbit1(AXP_PMU_BUS, AXP_PMU_ADDR,
info->en_reg, info->en_bit,
voltage > 0 ? 1 : 0, NULL);
}
}
int axp_supply_get_voltage(int supply)
{
const struct axp_supply_info* info = &axp_supply_info[supply];
if(info->volt_reg == 0)
return AXP_SUPPLY_NOT_PRESENT;
if(info->en_reg != 0) {
int r = i2c_reg_read1(AXP_PMU_BUS, AXP_PMU_ADDR, info->en_reg);
if(r < 0)
return AXP_SUPPLY_DISABLED;
#if HAVE_AXP_PMU == 192
if(supply == AXP_SUPPLY_LDO_IO0) {
if((r & 7) != 2)
return AXP_SUPPLY_DISABLED;
} else
#endif
{
if(r & (1 << info->en_bit) == 0)
return AXP_SUPPLY_DISABLED;
}
}
/* Hack, avoid undefined shift below. Can be useful too... */
if(info->volt_reg_mask == 0)
return info->min_mV;
int r = i2c_reg_read1(AXP_PMU_BUS, AXP_PMU_ADDR, info->volt_reg);
if(r < 0)
return 0;
int bit = find_first_set_bit(info->volt_reg_mask);
int val = (r & info->volt_reg_mask) >> bit;
return info->min_mV + (val * info->step_mV);
}
/* TODO: this can STILL indicate some false positives! */
int axp_battery_status(void)
{
int r = i2c_reg_read1(AXP_PMU_BUS, AXP_PMU_ADDR, AXP_REG_POWERSTATUS);
if(r >= 0) {
/* Charging bit indicates we're currently charging */
if((r & 0x04) != 0)
return AXP_BATT_CHARGING;
/* Not plugged in means we're discharging */
if((r & 0xf0) == 0)
return AXP_BATT_DISCHARGING;
} else {
/* Report discharging if we can't find out power status */
return AXP_BATT_DISCHARGING;
}
/* If the battery is full and not in use, the charging bit will be 0,
* there will be an external power source, AND the discharge current
* will be zero. Seems to rule out all false positives. */
int d = axp_adc_read_raw(ADC_DISCHARGE_CURRENT);
if(d == 0)
return AXP_BATT_FULL;
return AXP_BATT_DISCHARGING;
}
int axp_input_status(void)
{
#ifdef HAVE_BATTERY_SWITCH
int input_status = 0;
#else
int input_status = AXP_INPUT_BATTERY;
#endif
int r = i2c_reg_read1(AXP_PMU_BUS, AXP_PMU_ADDR, AXP_REG_POWERSTATUS);
if(r < 0)
return input_status;
/* Check for AC input */
if(r & 0x80)
input_status |= AXP_INPUT_AC;
/* Only report USB if ACIN and VBUS are not shorted */
if((r & 0x20) != 0 && (r & 0x02) == 0)
input_status |= AXP_INPUT_USB;
#ifdef HAVE_BATTERY_SWITCH
/* Check for battery presence if target defines it as removable */
r = i2c_reg_read1(AXP_PMU_BUS, AXP_PMU_ADDR, AXP_REG_CHARGESTATUS);
if(r >= 0 && (r & 0x20) != 0)
input_status |= AXP_INPUT_BATTERY;
#endif
return input_status;
}
int axp_adc_read(int adc)
{
int value = axp_adc_read_raw(adc);
if(value == INT_MIN)
return INT_MIN;
return axp_adc_conv_raw(adc, value);
}
int axp_adc_read_raw(int adc)
{
/* Read the ADC */
uint8_t buf[2];
uint8_t reg = axp_adc_info[adc].reg;
int rc = i2c_reg_read(AXP_PMU_BUS, AXP_PMU_ADDR, reg, 2, &buf[0]);
if(rc != I2C_STATUS_OK)
return INT_MIN;
/* Parse the value */
if(adc == ADC_CHARGE_CURRENT || adc == ADC_DISCHARGE_CURRENT)
return (buf[0] << 5) | (buf[1] & 0x1f);
else
return (buf[0] << 4) | (buf[1] & 0xf);
}
int axp_adc_conv_raw(int adc, int value)
{
if(adc == ADC_INTERNAL_TEMP)
return value - 1447;
else
return axp_adc_info[adc].num * value / axp_adc_info[adc].den;
}
void axp_adc_set_enabled(int adc_bits)
{
uint8_t xfer[3];
xfer[0] = 0;
xfer[1] = AXP_REG_ADCENABLE2;
xfer[2] = 0;
/* Compute the new register values */
const struct axp_adc_info* info = axp_adc_info;
for(int i = 0; i < NUM_ADC_CHANNELS; ++i) {
if(!(adc_bits & (1 << i)))
continue;
if(info[i].en_reg == AXP_REG_ADCENABLE1)
xfer[0] |= info[i].en_bit;
else
xfer[2] |= info[i].en_bit;
}
/* Update the configuration */
i2c_reg_write(AXP_PMU_BUS, AXP_PMU_ADDR, AXP_REG_ADCENABLE1, 3, &xfer[0]);
}
int axp_adc_get_rate(void)
{
int r = i2c_reg_read1(AXP_PMU_BUS, AXP_PMU_ADDR, AXP_REG_ADCSAMPLERATE);
if(r < 0)
return AXP_ADC_RATE_100HZ; /* an arbitrary value */
return (r >> 6) & 3;
}
void axp_adc_set_rate(int rate)
{
i2c_reg_modify1(AXP_PMU_BUS, AXP_PMU_ADDR, AXP_REG_ADCSAMPLERATE,
0xc0, (rate & 3) << 6, NULL);
}
static uint32_t axp_cc_parse(const uint8_t* buf)
{
return ((uint32_t)buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
}
void axp_cc_read(uint32_t* charge, uint32_t* discharge)
{
uint8_t buf[8];
int rc = i2c_reg_read(AXP_PMU_BUS, AXP_PMU_ADDR,
AXP_REG_COULOMBCOUNTERBASE, 8, &buf[0]);
if(rc != I2C_STATUS_OK) {
if(charge)
*charge = 0;
if(discharge)
*discharge = 0;
return;
}
if(charge)
*charge = axp_cc_parse(&buf[0]);
if(discharge)
*discharge = axp_cc_parse(&buf[4]);
}
void axp_cc_clear(void)
{
i2c_reg_setbit1(AXP_PMU_BUS, AXP_PMU_ADDR,
AXP_REG_COULOMBCOUNTERCTRL, 5, 1, NULL);
}
void axp_cc_enable(bool en)
{
i2c_reg_setbit1(AXP_PMU_BUS, AXP_PMU_ADDR,
AXP_REG_COULOMBCOUNTERCTRL, 7, en ? 1 : 0, NULL);
}
bool axp_cc_is_enabled(void)
{
int reg = i2c_reg_read1(AXP_PMU_BUS, AXP_PMU_ADDR,
AXP_REG_COULOMBCOUNTERCTRL);
return reg >= 0 && (reg & 0x40) != 0;
}
static const int chargecurrent_tbl[] = {
100, 190, 280, 360,
450, 550, 630, 700,
780, 880, 960, 1000,
1080, 1160, 1240, 1320,
};
void axp_set_charge_current(int current_mA)
{
/* find greatest charging current not exceeding requested current */
unsigned int index = 0;
while(index < ARRAYLEN(chargecurrent_tbl)-1 &&
chargecurrent_tbl[index+1] <= current_mA)
++index;
i2c_reg_modify1(AXP_PMU_BUS, AXP_PMU_ADDR,
AXP_REG_CHARGECONTROL1, 0x0f, index, NULL);
}
int axp_get_charge_current(void)
{
int ret = i2c_reg_read1(AXP_PMU_BUS, AXP_PMU_ADDR,
AXP_REG_CHARGECONTROL1);
if(ret < 0)
ret = 0;
return chargecurrent_tbl[ret & 0x0f];
}
void axp_power_off(void)
{
/* Set the shutdown bit */
i2c_reg_setbit1(AXP_PMU_BUS, AXP_PMU_ADDR,
AXP_REG_SHUTDOWNLEDCTRL, 7, 1, NULL);
}
#ifndef BOOTLOADER
enum {
AXP_DEBUG_BATTERY_STATUS,
AXP_DEBUG_INPUT_STATUS,
AXP_DEBUG_CHARGE_CURRENT,
AXP_DEBUG_COULOMB_COUNTERS,
AXP_DEBUG_ADC_RATE,
AXP_DEBUG_FIRST_ADC,
AXP_DEBUG_FIRST_SUPPLY = AXP_DEBUG_FIRST_ADC + NUM_ADC_CHANNELS,
AXP_DEBUG_NUM_ENTRIES = AXP_DEBUG_FIRST_SUPPLY + AXP_NUM_SUPPLIES,
};
static int axp_debug_menu_cb(int action, struct gui_synclist* lists)
{
(void)lists;
if(action == ACTION_NONE)
action = ACTION_REDRAW;
return action;
}
static const char* axp_debug_menu_get_name(int item, void* data,
char* buf, size_t buflen)
{
(void)data;
static const char* const adc_names[] = {
"V_acin", "I_acin", "V_vbus", "I_vbus", "T_int",
"V_ts", "V_batt", "I_chrg", "I_dchg", "V_aps", "P_batt"
};
static const char* const adc_units[] = {
"mV", "mA", "mV", "mA", "C", "mV", "mV", "mA", "mA", "mV", "uW",
};
static const char* const supply_names[] = {
"DCDC1", "DCDC2", "DCDC3",
"LDO1", "LDO2", "LDO3", "LDO_IO0",
};
int adc = item - AXP_DEBUG_FIRST_ADC;
if(item >= AXP_DEBUG_FIRST_ADC && adc < NUM_ADC_CHANNELS) {
int raw_value = axp_adc_read_raw(adc);
if(raw_value == INT_MIN) {
snprintf(buf, buflen, "%s: [Disabled]", adc_names[adc]);
return buf;
}
int value = axp_adc_conv_raw(adc, raw_value);
if(adc == ADC_INTERNAL_TEMP) {
snprintf(buf, buflen, "%s: %d.%d %s", adc_names[adc],
value/10, value%10, adc_units[adc]);
} else {
snprintf(buf, buflen, "%s: %d %s", adc_names[adc],
value, adc_units[adc]);
}
return buf;
}
int supply = item - AXP_DEBUG_FIRST_SUPPLY;
if(item >= AXP_DEBUG_FIRST_SUPPLY && supply < AXP_NUM_SUPPLIES) {
int voltage = axp_supply_get_voltage(supply);
if(voltage == AXP_SUPPLY_NOT_PRESENT)
snprintf(buf, buflen, "%s: [Not Present]", supply_names[supply]);
else if(voltage == AXP_SUPPLY_DISABLED)
snprintf(buf, buflen, "%s: [Disabled]", supply_names[supply]);
else
snprintf(buf, buflen, "%s: %d mV", supply_names[supply], voltage);
return buf;
}
switch(item) {
case AXP_DEBUG_BATTERY_STATUS: {
switch(axp_battery_status()) {
case AXP_BATT_FULL:
return "Battery: Full";
case AXP_BATT_CHARGING:
return "Battery: Charging";
case AXP_BATT_DISCHARGING:
return "Battery: Discharging";
default:
return "Battery: Unknown";
}
} break;
case AXP_DEBUG_INPUT_STATUS: {
int s = axp_input_status();
const char* ac = (s & AXP_INPUT_AC) ? " AC" : "";
const char* usb = (s & AXP_INPUT_USB) ? " USB" : "";
const char* batt = (s & AXP_INPUT_BATTERY) ? " Battery" : "";
snprintf(buf, buflen, "Inputs:%s%s%s", ac, usb, batt);
return buf;
} break;
case AXP_DEBUG_CHARGE_CURRENT: {
int current = axp_get_charge_current();
snprintf(buf, buflen, "Max charge current: %d mA", current);
return buf;
} break;
case AXP_DEBUG_COULOMB_COUNTERS: {
uint32_t charge, discharge;
axp_cc_read(&charge, &discharge);
snprintf(buf, buflen, "Coulomb counters: +%lu / -%lu",
(unsigned long)charge, (unsigned long)discharge);
return buf;
} break;
case AXP_DEBUG_ADC_RATE: {
int rate = 25 << axp_adc_get_rate();
snprintf(buf, buflen, "ADC sample rate: %d Hz", rate);
return buf;
} break;
default:
return "---";
}
}
bool axp_debug_menu(void)
{
struct simplelist_info info;
simplelist_info_init(&info, "AXP debug", AXP_DEBUG_NUM_ENTRIES, NULL);
info.action_callback = axp_debug_menu_cb;
info.get_name = axp_debug_menu_get_name;
return simplelist_show_list(&info);
}
#endif /* !BOOTLOADER */
/* This is basically the only valid implementation, so define it here */
unsigned int power_input_status(void)
{
unsigned int state = 0;
int input_status = axp_input_status();
if(input_status & AXP_INPUT_AC)
state |= POWER_INPUT_MAIN_CHARGER;
if(input_status & AXP_INPUT_USB)
state |= POWER_INPUT_USB_CHARGER;
#ifdef HAVE_BATTERY_SWITCH
if(input_status & AXP_INPUT_BATTERY)
state |= POWER_INPUT_BATTERY;
#endif
return state;
}
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