/*
* drivers/power/tps80031_battery_gauge.c
*
* Gas Gauge driver for TI's tps80031
*
* Copyright (c) 2011, NVIDIA Corporation.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/err.h>
#include <linux/regulator/machine.h>
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps80031.h>
#include <linux/tps80031-charger.h>
#define CHARGERUSB_CINLIMIT 0xee
#define CONTROLLER_STAT1 0xe3
#define LINEAR_CHARGE_STS 0xde
#define STS_HW_CONDITIONS 0x21
#define TOGGLE1 0x90
#define TOGGLE1_FGS BIT(5)
#define TOGGLE1_GPADCR BIT(1)
#define GPCH0_LSB 0x3b
#define GPCH0_MSB 0x3c
#define GPCH0_MSB_COLLISION_GP BIT(4)
#define GPSELECT_ISB 0x35
#define GPADC_CTRL 0x2e
#define MISC1 0xe4
#define CTRL_P1 0x36
#define CTRL_P1_SP1 BIT(3)
#define CTRL_P1_EOCRT BIT(2)
#define CTRL_P1_EOCP1 BIT(1)
#define CTRL_P1_BUSY BIT(0)
#define FG_REG_00 0xc0
#define FG_REG_00_CC_CAL_EN BIT(1)
#define FG_REG_00_CC_AUTOCLEAR BIT(2)
#define FG_REG_01 0xc1 /* CONV_NR (unsigned) 0 - 7 */
#define FG_REG_02 0xc2 /* CONV_NR (unsigned) 8 - 15 */
#define FG_REG_03 0xc3 /* CONV_NR (unsigned) 16 - 23 */
#define FG_REG_04 0xc4 /* ACCM (signed) 0 - 7 */
#define FG_REG_05 0xc5 /* ACCM (signed) 8 - 15 */
#define FG_REG_06 0xc6 /* ACCM (signed) 16 - 23 */
#define FG_REG_07 0xc7 /* ACCM (signed) 24 - 31 */
#define FG_REG_08 0xc8 /* OFFSET (signed) 0 - 7 */
#define FG_REG_09 0xc9 /* OFFSET (signed) 8 - 9 */
#define FG_REG_10 0xca /* LAST_READ (signed) 0 - 7 */
#define FG_REG_11 0xcb /* LAST_READ (signed) 8 - 13 */
#define TPS80031_VBUS_DET BIT(2)
#define TPS80031_VAC_DET BIT(3)
#define TPS80031_STS_VYSMIN_HI BIT(4)
#define END_OF_CHARGE BIT(5)
#define DRIVER_VERSION "1.1.0"
#define BATTERY_POLL_PERIOD 30000
static int tps80031_temp_table[] = {
/* adc code for temperature in degree C */
929, 925, /* -2, -1 */
920, 917, 912, 908, 904, 899, 895, 890, 885, 880, /* 00 - 09 */
875, 869, 864, 858, 853, 847, 841, 835, 829, 823, /* 10 - 19 */
816, 810, 804, 797, 790, 783, 776, 769, 762, 755, /* 20 - 29 */
748, 740, 732, 725, 718, 710, 703, 695, 687, 679, /* 30 - 39 */
671, 663, 655, 647, 639, 631, 623, 615, 607, 599, /* 40 - 49 */
591, 583, 575, 567, 559, 551, 543, 535, 527, 519, /* 50 - 59 */
511, 504, 496 /* 60 - 62 */
};
struct tps80031_device_info {
struct device *dev;
struct i2c_client *client;
struct power_supply bat;
struct power_supply ac;
struct power_supply usb;
struct timer_list battery_poll_timer;
uint32_t vsys;
uint8_t usb_online;
uint8_t ac_online;
uint8_t usb_status;
uint8_t capacity_sts;
uint8_t health;
uint8_t sys_vlow_intr;
uint8_t fg_calib_intr;
int16_t fg_offset;
struct mutex adc_lock;
};
static enum power_supply_property tps80031_bat_props[] = {
POWER_SUPPLY_PROP_TECHNOLOGY,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_TEMP,
POWER_SUPPLY_PROP_CAPACITY,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CHARGE_COUNTER,
};
static enum power_supply_property tps80031_usb_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
static enum power_supply_property tps80031_ac_props[] = {
POWER_SUPPLY_PROP_ONLINE,
};
static int tps80031_reg_read(struct tps80031_device_info *di, int sid, int reg,
uint8_t *val)
{
int ret;
ret = tps80031_read(di->dev->parent, sid, reg, val);
if (ret < 0)
dev_err(di->dev, "Failed read register 0x%02x\n",
reg);
return ret;
}
static int tps80031_reg_write(struct tps80031_device_info *di, int sid, int reg,
uint8_t val)
{
int ret;
ret = tps80031_write(di->dev->parent, sid, reg, val);
if (ret < 0)
dev_err(di->dev, "Failed write register 0x%02x\n",
reg);
return ret;
}
static int tps80031_battery_capacity(struct tps80031_device_info *di,
union power_supply_propval *val)
{
uint8_t hwsts;
int ret;
ret = tps80031_reg_read(di, SLAVE_ID2, LINEAR_CHARGE_STS, &hwsts);
if (ret < 0)
return ret;
di->capacity_sts = di->vsys;
if (hwsts & END_OF_CHARGE)
di->capacity_sts = 100;
if (di->sys_vlow_intr) {
di->capacity_sts = 10;
di->sys_vlow_intr = 0;
}
if (di->capacity_sts <= 10)
di->health = POWER_SUPPLY_HEALTH_DEAD;
else
di->health = POWER_SUPPLY_HEALTH_GOOD;
return di->capacity_sts;
}
static int tps80031_battery_voltage(struct tps80031_device_info *di,
union power_supply_propval *val)
{
int voltage;
voltage = tps80031_gpadc_conversion(SYSTEM_SUPPLY);
if (voltage < 0)
return voltage;
voltage = ((voltage * 1000) / 4) * 5;
if (voltage < 3700000)
di->vsys = 10;
else if (voltage > 3700000 && voltage <= 3800000)
di->vsys = 20;
else if (voltage > 3800000 && voltage <= 3900000)
di->vsys = 50;
else if (voltage > 3900000 && voltage <= 4000000)
di->vsys = 75;
else if (voltage >= 4000000)
di->vsys = 90;
return voltage;
}
static int tps80031_battery_charge_now(struct tps80031_device_info *di,
union power_supply_propval *val)
{
int charge;
charge = tps80031_gpadc_conversion(BATTERY_CHARGING_CURRENT);
if (charge < 0)
return charge;
charge = charge * 78125 / 40;
return charge;
}
static int tps80031_battery_charge_counter(struct tps80031_device_info *di,
union power_supply_propval *val)
{
int retval, ret;
uint32_t cnt_byte;
uint32_t acc_byte;
/* check if calibrated */
if (di->fg_calib_intr == 0)
return 0;
/* get current accumlator */
ret = tps80031_reads(di->dev->parent, SLAVE_ID2, FG_REG_04, 4,
(uint8_t *) &acc_byte);
if (ret < 0)
return ret;
/* counter value is mAs, need report uAh */
retval = (int32_t) acc_byte / 18 * 5;
/* get counter */
ret = tps80031_reads(di->dev->parent, SLAVE_ID2, FG_REG_01, 3,
(uint8_t *) &cnt_byte);
if (ret < 0)
return ret;
/* we need calibrate the offset current in uAh*/
retval = retval - (di->fg_offset / 4 * cnt_byte);
/* @todo, counter value will overflow if battery get continuously
* charged discharged for more than 108Ah using 250mS integration
* period althrough it is hightly impossible.
*/
return retval;
}
static int tps80031_battery_temp(struct tps80031_device_info *di,
union power_supply_propval *val)
{
int adc_code, temp;
adc_code = tps80031_gpadc_conversion(BATTERY_TEMPERATURE);
if (adc_code < 0)
return adc_code;
for (temp = 0; temp < ARRAY_SIZE(tps80031_temp_table); temp++) {
if (adc_code >= tps80031_temp_table[temp])
break;
}
/* first 2 values are for negative temperature */
val->intval = (temp - 2) * 10; /* in tenths of degree Celsius */
return val->intval;
}
#define to_tps80031_device_info_bat(x) container_of((x), \
struct tps80031_device_info, bat);
static int tps80031_bat_get_property(struct power_supply *psy,
enum power_supply_property psp, union power_supply_propval *val)
{
struct tps80031_device_info *di = to_tps80031_device_info_bat(psy);
switch (psp) {
case POWER_SUPPLY_PROP_TECHNOLOGY:
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
break;
case POWER_SUPPLY_PROP_HEALTH:
val->intval = di->health;
break;
case POWER_SUPPLY_PROP_CAPACITY:
val->intval = tps80031_battery_capacity(di, val);
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
val->intval = tps80031_battery_charge_now(di, val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
val->intval = tps80031_battery_voltage(di, val);
break;
case POWER_SUPPLY_PROP_CHARGE_COUNTER:
val->intval = tps80031_battery_charge_counter(di, val);
break;
case POWER_SUPPLY_PROP_STATUS:
val->intval = di->usb_status;
break;
case POWER_SUPPLY_PROP_TEMP:
val->intval = tps80031_battery_temp(di, val);
break;
default:
return -EINVAL;
}
return 0;
}
#define to_tps80031_device_info_usb(x) container_of((x), \
struct tps80031_device_info, usb);
static int tps80031_usb_get_property(struct power_supply *psy,
enum power_supply_property psp, union power_supply_propval *val)
{
struct tps80031_device_info *di = to_tps80031_device_info_usb(psy);
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = di->usb_online;
break;
default:
return -EINVAL;
}
return 0;
}
#define to_tps80031_device_info_ac(x) container_of((x), \
struct tps80031_device_info, ac);
static int tps80031_ac_get_property(struct power_supply *psy,
enum power_supply_property psp, union power_supply_propval *val)
{
struct tps80031_device_info *di = to_tps80031_device_info_ac(psy);
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
val->intval = di->ac_online;
break;
default:
return -EINVAL;
}
return 0;
}
static irqreturn_t tps80031_sys_vlow(int irq, void *data)
{
struct tps80031_device_info *di = data;
di->sys_vlow_intr = 1;
power_supply_changed(&di->bat);
return IRQ_HANDLED;
}
static irqreturn_t tps80031_fg_calibrated(int irq, void *data)
{
struct tps80031_device_info *di = data;
uint8_t acc_byte0;
uint8_t acc_byte1;
int ret;
ret = tps80031_reg_read(di, SLAVE_ID2, FG_REG_08, &acc_byte0);
if (ret < 0)
return IRQ_HANDLED;
ret = tps80031_reg_read(di, SLAVE_ID2, FG_REG_09, &acc_byte1);
if (ret < 0)
return IRQ_HANDLED;
/* sign extension */
if (acc_byte1 & 0x02)
acc_byte1 = acc_byte1 | 0xFC;
else
acc_byte1 = acc_byte1 & 0x03;
di->fg_offset = (int16_t) ((acc_byte1 << 8) | acc_byte0);
/* fuel gauge auto calibration finished */
di->fg_calib_intr = 1;
return IRQ_HANDLED;
}
static int tps80031_fg_start_gas_gauge(struct tps80031_device_info *di)
{
int ret = 0;
di->fg_calib_intr = 0;
/* start gas gauge */
ret = tps80031_reg_write(di, SLAVE_ID2, TOGGLE1, 0x20);
if (ret < 0)
return ret;
/* set ADC update time to 3.9ms and start calibration */
ret = tps80031_reg_write(di, SLAVE_ID2, FG_REG_00, FG_REG_00_CC_CAL_EN);
if (ret < 0)
return ret;
return ret;
}
void tps80031_battery_status(enum charging_states status, void *data)
{
struct tps80031_device_info *di = data;
int ret;
uint8_t retval;
if ((status == charging_state_charging_in_progress)) {
di->usb_status = POWER_SUPPLY_STATUS_CHARGING;
di->health = POWER_SUPPLY_HEALTH_GOOD;
ret = tps80031_reg_read(di, SLAVE_ID2,
CHARGERUSB_CINLIMIT, &retval);
if (ret < 0) {
di->ac_online = 0;
di->usb_online = 0;
}
if (retval == 0x9) {
di->ac_online = 0;
di->usb_online = 1;
} else {
di->usb_online = 0;
di->ac_online = 1;
}
} else if (status == charging_state_charging_stopped) {
di->usb_status = POWER_SUPPLY_STATUS_DISCHARGING;
di->ac_online = 0;
di->usb_online = 0;
}
power_supply_changed(&di->usb);
power_supply_changed(&di->bat);
power_supply_changed(&di->ac);
}
static void battery_poll_timer_func(unsigned long pdi)
{
struct tps80031_device_info *di = (void *)pdi;
power_supply_changed(&di->bat);
mod_timer(&di->battery_poll_timer,
jiffies + msecs_to_jiffies(BATTERY_POLL_PERIOD));
}
static int tps80031_battery_probe(struct platform_device *pdev)
{
int ret;
uint8_t retval;
struct device *dev = &pdev->dev;
struct tps80031_device_info *di;
struct tps80031_bg_platform_data *pdata = pdev->dev.platform_data;
di = devm_kzalloc(&pdev->dev, sizeof *di, GFP_KERNEL);
if (!di) {
dev_err(dev->parent, "failed to allocate device info data\n");
return -ENOMEM;
}
if (!pdata->battery_present) {
dev_err(dev, "%s() No battery detected, exiting..\n",
__func__);
return -ENODEV;
}
di->dev = &pdev->dev;
ret = tps80031_reg_read(di, SLAVE_ID2, CONTROLLER_STAT1, &retval);
if (ret < 0)
return ret;
if ((retval & TPS80031_VAC_DET) | (retval & TPS80031_VBUS_DET)) {
di->usb_status = POWER_SUPPLY_STATUS_CHARGING;
di->usb_online = 1;
} else {
di->usb_status = POWER_SUPPLY_STATUS_DISCHARGING;
di->usb_online = 0;
}
di->capacity_sts = 50;
di->health = POWER_SUPPLY_HEALTH_GOOD;
di->bat.name = "tps80031-bat";
di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
di->bat.properties = tps80031_bat_props;
di->bat.num_properties = ARRAY_SIZE(tps80031_bat_props);
di->bat.get_property = tps80031_bat_get_property;
ret = power_supply_register(dev->parent, &di->bat);
if (ret) {
dev_err(dev->parent, "failed to register bat power supply\n");
return ret;
}
di->usb.name = "tps80031-usb";
di->usb.type = POWER_SUPPLY_TYPE_USB;
di->usb.properties = tps80031_usb_props;
di->usb.num_properties = ARRAY_SIZE(tps80031_usb_props);
di->usb.get_property = tps80031_usb_get_property;
ret = power_supply_register(dev->parent, &di->usb);
if (ret) {
dev_err(dev->parent, "failed to register ac power supply\n");
goto power_supply_fail2;
}
di->ac.name = "tps80031-ac";
di->ac.type = POWER_SUPPLY_TYPE_MAINS;
di->ac.properties = tps80031_ac_props;
di->ac.num_properties = ARRAY_SIZE(tps80031_ac_props);
di->ac.get_property = tps80031_ac_get_property;
ret = power_supply_register(dev->parent, &di->ac);
if (ret) {
dev_err(dev->parent, "failed to register ac power supply\n");
goto power_supply_fail1;
}
dev_set_drvdata(&pdev->dev, di);
ret = register_charging_state_callback(tps80031_battery_status, di);
if (ret < 0)
goto power_supply_fail0;
ret = request_threaded_irq(pdata->irq_base + TPS80031_INT_SYS_VLOW,
NULL, tps80031_sys_vlow,
IRQF_ONESHOT, "tps80031_sys_vlow", di);
if (ret < 0) {
dev_err(dev->parent, "request IRQ %d fail\n", pdata->irq_base);
goto power_supply_fail0;
}
ret = request_threaded_irq(pdata->irq_base + TPS80031_INT_CC_AUTOCAL,
NULL, tps80031_fg_calibrated, IRQF_ONESHOT,
"tps80031_fuel_gauge_calibration", di);
if (ret < 0) {
dev_err(dev->parent, "request IRQ %d fail\n", pdata->irq_base);
goto irq_fail2;
}
setup_timer(&di->battery_poll_timer,
battery_poll_timer_func, (unsigned long) di);
mod_timer(&di->battery_poll_timer,
jiffies + msecs_to_jiffies(BATTERY_POLL_PERIOD));
ret = tps80031_fg_start_gas_gauge(di);
if (ret < 0) {
dev_err(dev->parent, "failed to start fuel-gauge\n");
goto irq_fail1;
}
dev_info(dev->parent, "support ver. %s enabled\n", DRIVER_VERSION);
return ret;
irq_fail1:
free_irq(pdata->irq_base + TPS80031_INT_CC_AUTOCAL, di);
irq_fail2:
free_irq(pdata->irq_base + TPS80031_INT_SYS_VLOW, di);
power_supply_fail0:
power_supply_unregister(&di->ac);
power_supply_fail1:
power_supply_unregister(&di->usb);
power_supply_fail2:
power_supply_unregister(&di->bat);
return ret;
}
static int tps80031_battery_remove(struct platform_device *pdev)
{
struct tps80031_device_info *di = dev_get_drvdata(&pdev->dev);
power_supply_unregister(&di->bat);
power_supply_unregister(&di->usb);
power_supply_unregister(&di->ac);
return 0;
}
static struct platform_driver tps80031_battery_driver = {
.driver = {
.name = "tps80031-battery-gauge",
.owner = THIS_MODULE,
},
.probe = tps80031_battery_probe,
.remove = tps80031_battery_remove,
};
static int __init tps80031_battery_init(void)
{
return platform_driver_register(&tps80031_battery_driver);
}
static void __exit tps80031_battery_exit(void)
{
platform_driver_unregister(&tps80031_battery_driver);
}
module_init(tps80031_battery_init);
module_exit(tps80031_battery_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com> ");
MODULE_DESCRIPTION("tps80031 battery gauge driver");
