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hwmon: qpnp-adc-common: Add absolute calibration support 

Incorrect channel readings are observed for xo_therm , pa_therm.
Changing the calibration type to absolute.

Change-Id: Ibec68b5c20206f26e1dfb4be2e02288696a64b9d
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>
This commit is contained in:
Rama Krishna Phani A 2015-04-07 15:56:57 +05:30 committed by Gerrit - the friendly Code Review server
parent cae9a6de31
commit 95664ba414
1 changed files with 43 additions and 3 deletions
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46
drivers/hwmon/qpnp-adc-common.c
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@ -839,6 +839,35 @@ static int32_t qpnp_adc_map_temp_voltage(const struct qpnp_vadc_map_pt *pts,
return 0;
}
static int64_t qpnp_adc_scale_absolute_calib(int32_t adc_code,
const struct qpnp_adc_properties *adc_properties,
const struct qpnp_vadc_chan_properties *chan_properties)
{
int64_t adc_voltage = 0;
bool negative_offset = 0;
if (!chan_properties || !chan_properties->offset_gain_numerator ||
!chan_properties->offset_gain_denominator || !adc_properties)
return -EINVAL;
adc_voltage = (adc_code -
chan_properties->adc_graph[CALIB_ABSOLUTE].adc_gnd)
* chan_properties->adc_graph[chan_properties->calib_type].dx;
if (adc_voltage < 0) {
negative_offset = 1;
adc_voltage = -adc_voltage;
}
do_div(adc_voltage,
chan_properties->adc_graph[CALIB_ABSOLUTE].dy);
if (negative_offset)
adc_voltage = -adc_voltage;
adc_voltage +=
chan_properties->adc_graph[CALIB_ABSOLUTE].dx;
return adc_voltage;
}
static int64_t qpnp_adc_scale_ratiometric_calib(int32_t adc_code,
const struct qpnp_adc_properties *adc_properties,
const struct qpnp_vadc_chan_properties *chan_properties)
@ -979,9 +1008,14 @@ int32_t qpnp_adc_tdkntcg_therm(struct qpnp_vadc_chip *chip,
|| !adc_chan_result)
return -EINVAL;
xo_thm = qpnp_adc_scale_ratiometric_calib(adc_code,
if (chan_properties->calib_type == CALIB_ABSOLUTE) {
xo_thm = qpnp_adc_scale_absolute_calib(adc_code,
adc_properties, chan_properties);
do_div(xo_thm , 1000);
} else {
xo_thm = qpnp_adc_scale_ratiometric_calib(adc_code,
adc_properties, chan_properties);
}
qpnp_adc_map_voltage_temp(adcmap_100k_104ef_104fb,
ARRAY_SIZE(adcmap_100k_104ef_104fb),
xo_thm, &adc_chan_result->physical);
@ -1215,8 +1249,14 @@ int32_t qpnp_adc_scale_therm_pu2(struct qpnp_vadc_chip *chip,
{
int64_t therm_voltage = 0;
therm_voltage = qpnp_adc_scale_ratiometric_calib(adc_code,
if (chan_properties->calib_type == CALIB_ABSOLUTE) {
therm_voltage = qpnp_adc_scale_absolute_calib(adc_code,
adc_properties, chan_properties);
do_div(therm_voltage , 1000);
} else {
therm_voltage = qpnp_adc_scale_ratiometric_calib(adc_code,
adc_properties, chan_properties);
}
qpnp_adc_map_voltage_temp(adcmap_100k_104ef_104fb,
ARRAY_SIZE(adcmap_100k_104ef_104fb),