/*
* Return battery voltage
* Or < 0 on failure.
*/
static int twl4030battery_voltage(void)
{
int ret, volt;
u8 hwsts;
struct twl4030_madc_request req;
twl4030_i2c_read_u8(TWL4030_MODULE_PM_MASTER, &hwsts,
REG_STS_HW_CONDITIONS);
if ((hwsts & STS_CHG) || (hwsts & STS_VBUS)) {
/* AC or USB charger connected */
volt = read_bci_val(T2_BATTERY_VOLT);
return (volt * VOLT_STEP_SIZE) / VOLT_PSR_R;
} else {
/* Use madc conversion */
req.channels = (1 << 12);
req.do_avg = 0;
req.method = TWL4030_MADC_SW1;
req.active = 0;
req.func_cb = NULL;
twl4030_madc_conversion(&req);
volt = (u16)req.rbuf[12];
return (volt * VOLT_STEP_SIZE) / VOLT_PSR_R;
}
}
/*
* Return battery voltage
* Or < 0 on failure.
*/
static int twl4030battery_voltage(void)
{
int volt;
if(system_rev >= 2){ // B-Project Rev.D (AP Fuel Gauge)
return max17043_get_voltage();
}
else
{
volt = read_bci_val(T2_BATTERY_VOLT);
return (volt * VOLT_STEP_SIZE) / VOLT_PSR_R;
}
}
/*
* Return the battery current
* Or < 0 on failure.
*/
static int twl4030battery_current(void)
{
int ret, curr = read_bci_val(T2_BATTERY_CUR);
u8 uninitialized_var(val);
ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
REG_BCICTL1);
if (ret)
return ret;
if (val & CGAIN) /* slope of 0.44 mV/mA */
return (curr * CURR_STEP_SIZE) / CURR_PSR_R1;
else /* slope of 0.88 mV/mA */
return (curr * CURR_STEP_SIZE) / CURR_PSR_R2;
}
/*
* Return battery temperature
* Or < 0 on failure.
*/
static int twl4030battery_temperature(void)
{
u8 uninitialized_var(val);
int temp, curr, volt, res, ret;
/* Getting and calculating the thermistor voltage */
ret = read_bci_val(T2_BATTERY_TEMP);
if (ret < 0)
return ret;
volt = (ret * TEMP_STEP_SIZE) / TEMP_PSR_R;
/* Getting and calculating the supply current in micro ampers */
ret = twl4030_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE, &val,
REG_BCICTL2);
if (ret)
return 0;
curr = ((val & ITHSENS) + 1) * 10;
/* Getting and calculating the thermistor resistance in ohms*/
res = volt * 1000 / curr;
/*calculating temperature*/
for (temp = 58; temp >= 0; temp--) {
int actual = therm_tbl[temp];
if ((actual - res) >= 0)
break;
}
/* Negative temperature */
if (temp < 3) {
if (temp == 2)
temp = -1;
else if (temp == 1)
temp = -2;
else
temp = -3;
}
return temp + 1;
}
