Re: [PATCH V2 2/3] iio: adc: qcom-vadc-common: add reverse scaling for PMIC5 Gen2 ADC_TM
From: Jonathan Cameron <jic23@kernel.org>
Date: 2021-10-27 17:49:04
Also in:
linux-arm-msm, linux-iio, linux-pm, lkml
On Tue, 26 Oct 2021 21:34:34 +0530 Jishnu Prakash [off-list ref] wrote:
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 <redacted>
This little utility function looks fine to me. Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
quoted hunk ↗ jump to hunk
--- drivers/iio/adc/qcom-vadc-common.c | 11 +++++++++++ include/linux/iio/adc/qcom-vadc-common.h | 2 ++ 2 files changed, 13 insertions(+)diff --git a/drivers/iio/adc/qcom-vadc-common.c b/drivers/iio/adc/qcom-vadc-common.c index 1472389..194d7c3 100644 --- a/drivers/iio/adc/qcom-vadc-common.c +++ b/drivers/iio/adc/qcom-vadc-common.c@@ -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,diff --git a/include/linux/iio/adc/qcom-vadc-common.h b/include/linux/iio/adc/qcom-vadc-common.h index 33f60f4..598a5d2 100644 --- a/include/linux/iio/adc/qcom-vadc-common.h +++ b/include/linux/iio/adc/qcom-vadc-common.h@@ -161,6 +161,8 @@ 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);