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system76/common: Add OZ26786 charger

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Jeremy Soller 2020-12-29 10:15:26 -07:00 committed by Jeremy Soller
parent fb6355f907
commit b156d18bc2
1 changed files with 142 additions and 0 deletions
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src/board/system76/common/charger/oz26786.c Normal file
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// SPDX-License-Identifier: GPL-3.0-only
//
// O2 Micro OZ26786
// No public datasheet
#include <board/battery.h>
#include <board/smbus.h>
#include <common/debug.h>
#include <common/macro.h>
// Registers
#define REG_CHARGE_CURRENT 0x14
#define REG_CHARGE_VOLTAGE 0x15
#define REG_CHARGE_OPTION_1 0x3D
#define CHARGE_OPTION_1_600KHZ BIT(11)
#define REG_CHARGE_OPTION_2 0x3B
#define CHARGE_OPTION_2_PSYS_EN BIT(11)
#define REG_ADAPTER_CURRENT 0x3F
// XXX: Assumption: ac_last is initialized high.
static bool charger_enabled = false;
int battery_charger_disable(void) {
int res = 0;
if (!charger_enabled) return 0;
// Set charge option 1 to converter frequency 600 KHz
//TODO: needed when charging disabled?
res = smbus_write(
CHARGER_ADDRESS,
REG_CHARGE_OPTION_1,
CHARGE_OPTION_1_600KHZ
);
if (res < 0) return res;
// Set charge option 2 to PSYS enable
//TODO: needed when charging disabled?
res = smbus_write(
CHARGER_ADDRESS,
REG_CHARGE_OPTION_2,
CHARGE_OPTION_2_PSYS_EN
);
if (res < 0) return res;
// Disable charge current
res = smbus_write(CHARGER_ADDRESS, REG_CHARGE_CURRENT, 0);
if (res < 0) return res;
// Disable charge voltage
res = smbus_write(CHARGER_ADDRESS, REG_CHARGE_VOLTAGE, 0);
if (res < 0) return res;
// Set input current in mA
//TODO: needed when charging disabled?
res = smbus_write(CHARGER_ADDRESS, REG_ADAPTER_CURRENT, CHARGER_INPUT_CURRENT);
if (res < 0) return res;
DEBUG("Charger disabled\n");
charger_enabled = false;
return 0;
}
int battery_charger_enable(void) {
int res = 0;
if (charger_enabled) return 0;
res = battery_charger_disable();
if (res < 0) return res;
// Set charge option 1 to converter frequency 600 KHz
res = smbus_write(
CHARGER_ADDRESS,
REG_CHARGE_OPTION_1,
CHARGE_OPTION_1_600KHZ
);
if (res < 0) return res;
// Set charge option 2 to PSYS enable
res = smbus_write(
CHARGER_ADDRESS,
REG_CHARGE_OPTION_2,
CHARGE_OPTION_2_PSYS_EN
);
if (res < 0) return res;
// Set charge current in mA
res = smbus_write(CHARGER_ADDRESS, REG_CHARGE_CURRENT, CHARGER_CHARGE_CURRENT);
if (res < 0) return res;
// Set charge voltage in mV
res = smbus_write(CHARGER_ADDRESS, REG_CHARGE_VOLTAGE, CHARGER_CHARGE_VOLTAGE);
if (res < 0) return res;
// Set input current in mA
res = smbus_write(CHARGER_ADDRESS, REG_ADAPTER_CURRENT, CHARGER_INPUT_CURRENT);
if (res < 0) return res;
DEBUG("Charger enabled\n");
charger_enabled = true;
return 0;
}
void battery_charger_event(void) {
// Avoid watchdog timeout
if (charger_enabled) {
// Set charge voltage in mV
smbus_write(CHARGER_ADDRESS, REG_CHARGE_VOLTAGE, CHARGER_CHARGE_VOLTAGE);
}
}
void battery_debug(void) {
uint16_t data = 0;
int res = 0;
#define command(N, A, V) { \
DEBUG(" " #N ": "); \
res = smbus_read(A, V, &data); \
if (res < 0) { \
DEBUG("ERROR %04X\n", -res); \
} else { \
DEBUG("%04X\n", data); \
} \
}
DEBUG("Battery:\n");
command(Temperature, BATTERY_ADDRESS, 0x08);
command(Voltage, BATTERY_ADDRESS, 0x09);
command(Current, BATTERY_ADDRESS, 0x0A);
command(Charge, BATTERY_ADDRESS, 0x0D);
command(Status, BATTERY_ADDRESS, 0x16);
DEBUG("Charger (oz26786):\n");
command(ChargeCurrent, CHARGER_ADDRESS, REG_CHARGE_CURRENT);
command(ChargeVoltage, CHARGER_ADDRESS, REG_CHARGE_VOLTAGE);
command(ChargeOption_1, CHARGER_ADDRESS, REG_CHARGE_OPTION_1);
command(ChargeOption_2, CHARGER_ADDRESS, REG_CHARGE_OPTION_2);
command(AdapterCurrent, CHARGER_ADDRESS, REG_ADAPTER_CURRENT);
#undef command
}