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iio: adc: spmi-adc5: Add support for PM2250 S3 die temp channel

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Add support for reading S3 die_temp channel on PM2250 by
specifying the scaling function.

Change-Id: I1e8fcba0058851a540bc39adc7606d4f0ad8f6db
Signed-off-by: Jishnu Prakash <jprakash@codeaurora.org>
[quic_subbaram@quicinc.com: Fixed merge conflicts in
 qcom-vadc-common.h due to location change]
Signed-off-by: Subbaraman Narayanamurthy <quic_subbaram@quicinc.com>
[quic_collinsd@quicinc.com: changed struct vadc_prescale_ratio to
 struct u32_fract and changed prescale "num" and "den" to
 "numerator" and "denominator" respectively]
Signed-off-by: David Collins <quic_collinsd@quicinc.com>
This commit is contained in:
Jishnu Prakash 2020-07-20 15:15:37 +05:30 committed by David Collins
parent 7aac9f426d
commit 50f6bca490
2 changed files with 40 additions and 0 deletions
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34
drivers/iio/adc/qcom-vadc-common.c
View File

@ -582,6 +582,10 @@ static int qcom_vadc_scale_hw_smb1398_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc_scale_hw_pm2250_s3_die_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec);
static int qcom_vadc_scale_hw_chg5_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
@ -619,6 +623,7 @@ static struct qcom_adc5_scale_type scale_adc5_fn[] = {
[SCALE_HW_CALIB_PM5_CHG_TEMP] = {qcom_vadc_scale_hw_chg5_temp},
[SCALE_HW_CALIB_PM5_SMB_TEMP] = {qcom_vadc_scale_hw_smb_temp},
[SCALE_HW_CALIB_PM5_SMB1398_TEMP] = {qcom_vadc_scale_hw_smb1398_temp},
[SCALE_HW_CALIB_PM2250_S3_DIE_TEMP] = {qcom_vadc_scale_hw_pm2250_s3_die_temp},
[SCALE_HW_CALIB_PM7_SMB_TEMP] = {qcom_vadc_scale_hw_pm7_smb_temp},
[SCALE_HW_CALIB_PM7_CHG_TEMP] = {qcom_vadc_scale_hw_pm7_chg_temp},
};
@ -1059,6 +1064,35 @@ static int qcom_vadc_scale_hw_smb1398_temp(
return 0;
}
static int qcom_vadc_scale_hw_pm2250_s3_die_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_mdec)
{
s64 voltage = 0, adc_vdd_ref_mv = 1875;
if (adc_code > VADC5_MAX_CODE)
adc_code = 0;
/* (ADC code * vref_vadc (1.875V)) / full_scale_code */
voltage = (s64) adc_code * adc_vdd_ref_mv * 1000;
voltage = div64_s64(voltage, data->full_scale_code_volt);
if (voltage > 0) {
voltage *= prescale->denominator;
voltage = div64_s64(voltage, prescale->numerator);
} else {
voltage = 0;
}
voltage = PMIC5_PM2250_S3_DIE_TEMP_CONSTANT - voltage;
voltage *= 100000;
voltage = div64_s64(voltage, PMIC5_PM2250_S3_DIE_TEMP_SCALE_FACTOR);
*result_mdec = voltage;
return 0;
}
static int qcom_vadc_scale_hw_chg5_temp(
const struct u32_fract *prescale,
const struct adc5_data *data,

6
include/linux/iio/adc/qcom-vadc-common.h
View File

@ -47,6 +47,9 @@
#define PMIC5_SMB1398_TEMP_CONSTANT 268235
#define PMIC5_SMB1398_TEMP_SCALE_FACTOR 340
#define PMIC5_PM2250_S3_DIE_TEMP_SCALE_FACTOR 187263
#define PMIC5_PM2250_S3_DIE_TEMP_CONSTANT 720100
#define PMI_CHG_SCALE_1 -138890
#define PMI_CHG_SCALE_2 391750000000LL
@ -126,6 +129,8 @@ struct vadc_linear_graph {
* use voltage scaling.
* SCALE_HW_CALIB_CUR_RAW: Returns result in microamperes for PMIC7 channels
* that use raw ADC code.
* SCALE_HW_CALIB_PM2250_S3_DIE_TEMP: Returns result in millidegrees for
* S3 die temperature channel on PM2250.
*/
enum vadc_scale_fn_type {
SCALE_DEFAULT = 0,
@ -149,6 +154,7 @@ enum vadc_scale_fn_type {
SCALE_HW_CALIB_PM7_CHG_TEMP,
SCALE_HW_CALIB_CUR,
SCALE_HW_CALIB_CUR_RAW,
SCALE_HW_CALIB_PM2250_S3_DIE_TEMP,
SCALE_HW_CALIB_INVALID,
};