Commit 238e34ad authored Apr 03, 2022 by Jishnu Prakash Committed by Daniel Lezcano May 19, 2022

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>

parent e46e003a

drivers/iio/adc/qcom-vadc-common.c

+11 −0

Original line number	Original line	Diff line number	Diff line
	@@ -677,6 +677,17 @@ u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
	}		}
	EXPORT_SYMBOL(qcom_adc_tm5_temp_volt_scale);		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,		int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
	unsigned int prescale_ratio,		unsigned int prescale_ratio,
	const struct adc5_data *data,		const struct adc5_data *data,

include/linux/iio/adc/qcom-vadc-common.h

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -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,		u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
	u32 full_scale_code_volt, int temp);		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_prescaling_from_dt(u32 num, u32 den);

	int qcom_adc5_hw_settle_time_from_dt(u32 value, const unsigned int *hw_settle);		int qcom_adc5_hw_settle_time_from_dt(u32 value, const unsigned int *hw_settle);