diff options
Diffstat (limited to 'board/kunimitsu/battery.c')
| -rw-r--r-- | board/kunimitsu/battery.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/board/kunimitsu/battery.c b/board/kunimitsu/battery.c index e03d687daf..3a10e0761b 100644 --- a/board/kunimitsu/battery.c +++ b/board/kunimitsu/battery.c @@ -5,6 +5,7 @@ * Battery pack vendor provided charging profile */ +#include "adc.h" #include "battery.h" #include "battery_smart.h" #include "util.h" @@ -42,3 +43,41 @@ int board_cut_off_battery(void) return sb_write(SB_MANUFACTURER_ACCESS, SB_SHUTDOWN_DATA); } + +#ifdef CONFIG_BATTERY_PRESENT_CUSTOM +/* + * Physical detection of battery via ADC. + * + * Upper limit of valid voltage level (mV), when battery is attached to ADC + * port, is across the internal thermistor with external pullup resistor. + */ +#define BATT_PRESENT_MV 1500 +enum battery_present battery_is_present(void) +{ + enum battery_present batt_pres; + int batt_status; + + /* + * if voltage is below certain level (dependent on ratio of + * internal thermistor and external pullup resister), + * battery is attached. + */ + batt_pres = (adc_read_channel(ADC_BATT_PRESENT) > BATT_PRESENT_MV) ? + BP_NO : BP_YES; + + /* + * Make sure battery status is implemented, I2C transactions are + * success & the battery status is Initialized to find out if it + * is a working battery and it is not in the cut-off mode. + * + * FETs are turned off after Power Shutdown time. + * The device will wake up when a voltage is applied to PACK. + * Battery status will be inactive until it is initialized. + */ + if (batt_pres == BP_YES && !battery_status(&batt_status)) + if (!(batt_status & STATUS_INITIALIZED)) + batt_pres = BP_NO; + + return batt_pres; +} +#endif |