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iio: qcom-spmi-adc5: add support to read current channels

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Add support to read current channels on PM8350B and SMB139x
charge pumps.

IIN_FB - Input current drawn by main charger (PM8350B)
ICHG_FB - Charging current from main charger (PM8350B)
IIN_SMB - Input current drawn by one of SMB139x
ICHG_SMB - Charging current from one of SMB139x

Since, most of these channels needs prescale ratios post reading
ADC code and before scaling, add the necessary prescale ratios.

Change-Id: Id9b866f684d574813904a5fd8e658f59b1d7bcbf
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
This commit is contained in:
Subbaraman Narayanamurthy 2020-09-11 12:55:05 -07:00
commit 338debf2e5
3 changed files with 73 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

21
drivers/iio/adc/qcom-spmi-adc5.c
View file

@ -165,7 +165,13 @@ static const struct vadc_prescale_ratio adc5_prescale_ratios[] = {
{.num = 1, .den = 8},
{.num = 10, .den = 81},
{.num = 1, .den = 10},
{.num = 1, .den = 16}
{.num = 1, .den = 16},
/* Prescale ratios for current channels below */
{.num = 32, .den = 100}, /* IIN_FB */
{.num = 14, .den = 100}, /* ICHG_SMB */
{.num = 28, .den = 100}, /* IIN_SMB */
{.num = 1000, .den = 305185}, /* ICHG_FB */
{.num = 1000, .den = 610370}, /* ICHG_FB_2X */
};
static int adc5_read(struct adc5_chip *adc, u16 offset, u8 *data, int len)
@ -612,6 +618,11 @@ struct adc5_channels {
BIT(IIO_CHAN_INFO_PROCESSED), \
_pre, _scale) \
#define ADC5_CHAN_CUR(_dname, _pre, _scale) \
ADC5_CHAN(_dname, IIO_CURRENT, \
BIT(IIO_CHAN_INFO_PROCESSED), \
_pre, _scale) \
static const struct adc5_channels adc5_chans_pmic[ADC5_MAX_CHANNEL] = {
[ADC5_REF_GND] = ADC5_CHAN_VOLT("ref_gnd", 0,
SCALE_HW_CALIB_DEFAULT)
@ -677,6 +688,14 @@ static const struct adc5_channels adc7_chans_pmic[ADC5_MAX_CHANNEL] = {
SCALE_HW_CALIB_PM7_SMB_TEMP)
[ADC7_CHG_TEMP] = ADC5_CHAN_TEMP("chg_temp", 0,
SCALE_HW_CALIB_PM7_CHG_TEMP)
[ADC7_IIN_FB] = ADC5_CHAN_CUR("iin_fb", 9,
SCALE_HW_CALIB_CUR)
[ADC7_ICHG_SMB] = ADC5_CHAN_CUR("ichg_smb", 10,
SCALE_HW_CALIB_CUR)
[ADC7_IIN_SMB] = ADC5_CHAN_CUR("iin_smb", 11,
SCALE_HW_CALIB_CUR)
[ADC7_ICHG_FB] = ADC5_CHAN_CUR("ichg_fb", 12,
SCALE_HW_CALIB_CUR_RAW)
[ADC7_DIE_TEMP] = ADC5_CHAN_TEMP("die_temp", 0,
SCALE_HW_CALIB_PMIC_THERM_PM7)
[ADC7_AMUX_THM1_100K_PU] = ADC5_CHAN_TEMP("amux_thm1_pu2", 0,

48
drivers/iio/adc/qcom-vadc-common.c
View file

@ -512,6 +512,14 @@ static int qcom_vadc_scale_hw_calib_volt(
const struct vadc_prescale_ratio *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_uv);
static int qcom_vadc_scale_hw_calib_current(
const struct vadc_prescale_ratio *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_ua);
static int qcom_vadc_scale_hw_calib_current_raw(
const struct vadc_prescale_ratio *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_ua);
static int qcom_vadc_scale_hw_calib_therm(
const struct vadc_prescale_ratio *prescale,
const struct adc5_data *data,
@ -563,6 +571,8 @@ static int qcom_vadc7_scale_hw_calib_die_temp(
static struct qcom_adc5_scale_type scale_adc5_fn[] = {
[SCALE_HW_CALIB_DEFAULT] = {qcom_vadc_scale_hw_calib_volt},
[SCALE_HW_CALIB_CUR] = {qcom_vadc_scale_hw_calib_current},
[SCALE_HW_CALIB_CUR_RAW] = {qcom_vadc_scale_hw_calib_current_raw},
[SCALE_HW_CALIB_THERM_100K_PULLUP] = {qcom_vadc_scale_hw_calib_therm},
[SCALE_HW_CALIB_BATT_THERM_100K] = {
qcom_vadc_scale_hw_calib_batt_therm_100},
@ -782,6 +792,44 @@ static int qcom_vadc7_scale_hw_calib_therm(
return 0;
}
static int qcom_vadc_scale_hw_calib_current_raw(
const struct vadc_prescale_ratio *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_ua)
{
s64 temp;
if (!prescale->num)
return -EINVAL;
temp = div_s64((s64)(s16)adc_code * prescale->den, prescale->num);
*result_ua = (int) temp;
pr_debug("raw adc_code: %#x result_ua: %d\n", adc_code, *result_ua);
return 0;
}
static int qcom_vadc_scale_hw_calib_current(
const struct vadc_prescale_ratio *prescale,
const struct adc5_data *data,
u16 adc_code, int *result_ua)
{
u32 adc_vdd_ref_mv = 1875;
s64 voltage;
if (!prescale->num)
return -EINVAL;
/* (ADC code * vref_vadc (1.875V)) / full_scale_code */
voltage = (s64)(s16) adc_code * adc_vdd_ref_mv * 1000;
voltage = div_s64(voltage, data->full_scale_code_volt);
voltage = div_s64(voltage * prescale->den, prescale->num);
*result_ua = (int) voltage;
pr_debug("adc_code: %#x result_ua: %d\n", adc_code, *result_ua);
return 0;
}
static int qcom_vadc_scale_hw_calib_volt(
const struct vadc_prescale_ratio *prescale,
const struct adc5_data *data,

5
drivers/iio/adc/qcom-vadc-common.h
View file

@ -123,6 +123,8 @@ struct vadc_prescale_ratio {
* 100k pullup. The hardware applies offset/slope to adc code.
* SCALE_HW_CALIB_PMIC_THERM: Returns result in milli degree's Centigrade.
* The hardware applies offset/slope to adc code.
* SCALE_HW_CALIB_CUR: Returns result in microamperes for PMIC7 channels that
* uses voltage scaling.
* SCALE_HW_CALIB_PM5_CHG_TEMP: Returns result in millidegrees for PMIC5
* charger temperature.
* SCALE_HW_CALIB_PM5_SMB_TEMP: Returns result in millidegrees for PMIC5
@ -146,6 +148,8 @@ struct vadc_prescale_ratio {
* SMB139x temperature.
* SCALE_HW_CALIB_PM7_CHG_TEMP: Returns result in millidegrees for PMIC7
* charger temperature.
* SCALE_HW_CALIB_CUR_RAW: Returns result in microamperes for PMIC7 channels
* that uses raw ADC code.
*/
enum vadc_scale_fn_type {
SCALE_DEFAULT = 0,
@ -168,6 +172,7 @@ enum vadc_scale_fn_type {
SCALE_HW_CALIB_PMIC_THERM_PM7,
SCALE_HW_CALIB_PM7_SMB_TEMP,
SCALE_HW_CALIB_PM7_CHG_TEMP,
SCALE_HW_CALIB_CUR_RAW,
SCALE_HW_CALIB_INVALID,
};