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/*
* Copyright (C) 2012 Samsung Electronics
* Lukasz Majewski <l.majewski@samsung.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <power/pmic.h>
#include <power/max17042_fg.h>
#include <i2c.h>
#include <power/max8997_pmic.h>
#include <power/power_chrg.h>
#include <power/battery.h>
#include <power/fg_battery_cell_params.h>
#include <errno.h>
static int fg_write_regs(struct pmic *p, u8 addr, u16 *data, int num)
{
int ret = 0;
int i;
for (i = 0; i < num; i++, addr++)
ret |= pmic_reg_write(p, addr, *(data + i));
return ret;
}
static int fg_read_regs(struct pmic *p, u8 addr, u16 *data, int num)
{
int ret = 0;
int i;
for (i = 0; i < num; i++, addr++)
ret |= pmic_reg_read(p, addr, (u32 *) (data + i));
return ret;
}
static int fg_write_and_verify(struct pmic *p, u8 addr, u16 data)
{
unsigned int val = data;
int ret = 0;
ret |= pmic_reg_write(p, addr, val);
ret |= pmic_reg_read(p, addr, &val);
if (ret)
return ret;
if (((u16) val) == data)
return 0;
return -1;
}
static void por_fuelgauge_init(struct pmic *p)
{
u16 r_data0[16], r_data1[16], r_data2[16];
u32 rewrite_count = 5, i = 0;
unsigned int val;
int ret = 0;
/* Delay 500 ms */
mdelay(500);
/* Initilize Configuration */
pmic_reg_write(p, MAX17042_CONFIG, 0x2310);
rewrite_model:
/* Unlock Model Access */
pmic_reg_write(p, MAX17042_MLOCKReg1, MODEL_UNLOCK1);
pmic_reg_write(p, MAX17042_MLOCKReg2, MODEL_UNLOCK2);
/* Write/Read/Verify the Custom Model */
ret |= fg_write_regs(p, MAX17042_MODEL1, cell_character0,
ARRAY_SIZE(cell_character0));
ret |= fg_write_regs(p, MAX17042_MODEL2, cell_character1,
ARRAY_SIZE(cell_character1));
ret |= fg_write_regs(p, MAX17042_MODEL3, cell_character2,
ARRAY_SIZE(cell_character2));
if (ret) {
printf("%s: Cell parameters write failed!\n", __func__);
return;
}
ret |= fg_read_regs(p, MAX17042_MODEL1, r_data0, ARRAY_SIZE(r_data0));
ret |= fg_read_regs(p, MAX17042_MODEL2, r_data1, ARRAY_SIZE(r_data1));
ret |= fg_read_regs(p, MAX17042_MODEL3, r_data2, ARRAY_SIZE(r_data2));
if (ret)
printf("%s: Cell parameters read failed!\n", __func__);
for (i = 0; i < 16; i++) {
if ((cell_character0[i] != r_data0[i])
|| (cell_character1[i] != r_data1[i])
|| (cell_character2[i] != r_data2[i]))
goto rewrite_model;
}
/* Lock model access */
pmic_reg_write(p, MAX17042_MLOCKReg1, MODEL_LOCK1);
pmic_reg_write(p, MAX17042_MLOCKReg2, MODEL_LOCK2);
/* Verify the model access is locked */
ret |= fg_read_regs(p, MAX17042_MODEL1, r_data0, ARRAY_SIZE(r_data0));
ret |= fg_read_regs(p, MAX17042_MODEL2, r_data1, ARRAY_SIZE(r_data1));
ret |= fg_read_regs(p, MAX17042_MODEL3, r_data2, ARRAY_SIZE(r_data2));
if (ret) {
printf("%s: Cell parameters read failed!\n", __func__);
return;
}
for (i = 0; i < ARRAY_SIZE(r_data0); i++) {
/* Check if model locked */
if (r_data0[i] || r_data1[i] || r_data2[i]) {
/* Rewrite model data - prevent from endless loop */
if (rewrite_count--) {
puts("FG - Lock model access failed!\n");
goto rewrite_model;
}
}
}
/* Write Custom Parameters */
fg_write_and_verify(p, MAX17042_RCOMP0, RCOMP0);
fg_write_and_verify(p, MAX17042_TEMPCO, TempCo);
/* Delay at least 350mS */
mdelay(350);
/* Initialization Complete */
pmic_reg_read(p, MAX17042_STATUS, &val);
/* Write and Verify Status with POR bit Cleared */
fg_write_and_verify(p, MAX17042_STATUS, val & ~MAX17042_POR);
/* Delay at least 350 ms */
mdelay(350);
}
static int power_update_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 max17042 fuel gauge\n");
return -1;
}
ret |= pmic_reg_read(p, MAX17042_VFSOC, &val);
pb->bat->state_of_chrg = (val >> 8);
pmic_reg_read(p, MAX17042_VCELL, &val);
debug("vfsoc: 0x%x\n", val);
pb->bat->voltage_uV = ((val & 0xFFUL) >> 3) + ((val & 0xFF00) >> 3);
pb->bat->voltage_uV = (pb->bat->voltage_uV * 625);
pmic_reg_read(p, 0x05, &val);
pb->bat->capacity = val >> 2;
return ret;
}
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 max17042 fuel gauge\n");
return -1;
}
ret |= pmic_reg_read(p, MAX17042_STATUS, &val);
debug("fg status: 0x%x\n", val);
if (val == MAX17042_POR)
por_fuelgauge_init(p);
ret |= pmic_reg_read(p, MAX17042_VERSION, &val);
pb->bat->version = val;
power_update_battery(p, bat);
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 ret;
}
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[] = "MAX17042_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 = MAX17042_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;
}
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