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iio: adc: qcom-vadc-common: add reverse scaling for PMIC5 Gen2 ADC_TM 

Add reverse scaling function for PMIC5 Gen2 ADC_TM, to convert
temperature to raw ADC code, for setting thresholds for
thermistor channels.

Signed-off-by: Jishnu Prakash <quic_jprakash@quicinc.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/1648991869-20899-3-git-send-email-quic_jprakash@quicinc.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Jishnu Prakash 2022-04-03 18:47:47 +05:30 committed by Daniel Lezcano
parent e46e003a48
commit 238e34ad7d
2 changed files with 13 additions and 0 deletions
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11
drivers/iio/adc/qcom-vadc-common.c
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@ -677,6 +677,17 @@ u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
}
EXPORT_SYMBOL(qcom_adc_tm5_temp_volt_scale);
u16 qcom_adc_tm5_gen2_temp_res_scale(int temp)
{
int64_t resistance;
resistance = qcom_vadc_map_temp_voltage(adcmap7_100k,
ARRAY_SIZE(adcmap7_100k), temp);
return div64_s64(resistance * RATIO_MAX_ADC7, resistance + R_PU_100K);
}
EXPORT_SYMBOL(qcom_adc_tm5_gen2_temp_res_scale);
int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
unsigned int prescale_ratio,
const struct adc5_data *data,

2
include/linux/iio/adc/qcom-vadc-common.h
View File

@ -152,6 +152,8 @@ int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
u32 full_scale_code_volt, int temp);
u16 qcom_adc_tm5_gen2_temp_res_scale(int temp);
int qcom_adc5_prescaling_from_dt(u32 num, u32 den);
int qcom_adc5_hw_settle_time_from_dt(u32 value, const unsigned int *hw_settle);