adc_single
battery = adc_single(ADC_CHANNEL_BATTERY);
backup = adc_single(ADC_CHANNEL_BACKUP);
charging = adc_single(ADC_CHANNEL_CHARGE);
int adc_single(unsigned int channel);
EXPORT_SYMBOL(adc_single);
absy = adc_single(ADC_CHANNEL_TS_Y);
absx = adc_single(ADC_CHANNEL_TS_X);