fg_max77693.c
2.68 KB
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2013 Samsung Electronics
* Piotr Wilczek <p.wilczek@samsung.com>
*/
#include <common.h>
#include <power/pmic.h>
#include <power/max77693_fg.h>
#include <i2c.h>
#include <power/power_chrg.h>
#include <power/battery.h>
#include <power/fg_battery_cell_params.h>
#include <errno.h>
static int max77693_get_vcell(u32 *vcell)
{
u16 value;
u8 ret;
ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VCELL, 1,
(u8 *)&value, 2);
if (ret)
return ret;
*vcell = (u32)(value >> 3);
*vcell = *vcell * 625;
return 0;
}
static int max77693_get_soc(u32 *soc)
{
u16 value;
u8 ret;
ret = i2c_read(MAX77693_FUEL_I2C_ADDR, MAX77693_VFSOC, 1,
(u8 *)&value, 2);
if (ret)
return ret;
*soc = (u32)(value >> 8);
return 0;
}
static int power_update_battery(struct pmic *p, struct pmic *bat)
{
struct power_battery *pb = bat->pbat;
int ret;
if (pmic_probe(p)) {
puts("Can't find max77693 fuel gauge\n");
return -ENODEV;
}
ret = max77693_get_soc(&pb->bat->state_of_chrg);
if (ret)
return ret;
max77693_get_vcell(&pb->bat->voltage_uV);
return 0;
}
static int power_check_battery(struct pmic *p, struct pmic *bat)
{
struct power_battery *pb = bat->pbat;
unsigned int val;
int ret = 0;
if (pmic_probe(p)) {
puts("Can't find max77693 fuel gauge\n");
return -ENODEV;
}
ret = pmic_reg_read(p, MAX77693_STATUS, &val);
if (ret)
return ret;
debug("fg status: 0x%x\n", val);
ret = pmic_reg_read(p, MAX77693_VERSION, &pb->bat->version);
if (ret)
return ret;
ret = power_update_battery(p, bat);
if (ret)
return ret;
debug("fg ver: 0x%x\n", pb->bat->version);
printf("BAT: state_of_charge(SOC):%d%%\n",
pb->bat->state_of_chrg);
printf(" voltage: %d.%6.6d [V] (expected to be %d [mAh])\n",
pb->bat->voltage_uV / 1000000,
pb->bat->voltage_uV % 1000000,
pb->bat->capacity);
if (pb->bat->voltage_uV > 3850000)
pb->bat->state = EXT_SOURCE;
else if (pb->bat->voltage_uV < 3600000 || pb->bat->state_of_chrg < 5)
pb->bat->state = CHARGE;
else
pb->bat->state = NORMAL;
return 0;
}
static struct power_fg power_fg_ops = {
.fg_battery_check = power_check_battery,
.fg_battery_update = power_update_battery,
};
int power_fg_init(unsigned char bus)
{
static const char name[] = "MAX77693_FG";
struct pmic *p = pmic_alloc();
if (!p) {
printf("%s: POWER allocation error!\n", __func__);
return -ENOMEM;
}
debug("Board Fuel Gauge init\n");
p->name = name;
p->interface = PMIC_I2C;
p->number_of_regs = FG_NUM_OF_REGS;
p->hw.i2c.addr = MAX77693_FUEL_I2C_ADDR;
p->hw.i2c.tx_num = 2;
p->sensor_byte_order = PMIC_SENSOR_BYTE_ORDER_BIG;
p->bus = bus;
p->fg = &power_fg_ops;
return 0;
}