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hwmon: qpnp-adc: Fix incorrect 625mV channel read

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Incorrect 625mV channel reads results into sudden
BMS SOC jumps and device shutdown.

Fix the problem by resetting the status variable
on each ADC channel read.

Change-Id: I12afcb32cb684c830ed14a444a1aec49aa18f846
Signed-off-by: Dipen Parmar <dipenp@codeaurora.org>
This commit is contained in:
Dipen Parmar 2014-10-17 14:17:25 +05:30
parent b40d25c88c
commit 5c45335145
1 changed files with 7 additions and 1 deletions
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8
drivers/hwmon/qpnp-adc-voltage.c
View file

@ -1482,6 +1482,11 @@ int32_t qpnp_vadc_conv_seq_request(struct qpnp_vadc_chip *vadc,
}
calib_type = vadc->adc->adc_channels[dt_index].calib_type;
if (calib_type >= CALIB_NONE) {
pr_err("not a valid calib_type\n");
rc = -EINVAL;
goto fail_unlock;
}
calib_offset = (calib_type == CALIB_ABSOLUTE) ?
QPNP_VADC_ABSOLUTE_RECALIB_OFFSET :
QPNP_VADC_RATIOMETRIC_RECALIB_OFFSET;
@ -1505,6 +1510,7 @@ int32_t qpnp_vadc_conv_seq_request(struct qpnp_vadc_chip *vadc,
}
recalibrate:
status1 = 0;
vadc->adc->amux_prop->decimation =
vadc->adc->adc_channels[dt_index].adc_decimation;
vadc->adc->amux_prop->hw_settle_time =
@ -1629,7 +1635,6 @@ recalibrate:
vadc->adc->amux_prop->chan_prop->adc_graph[calib_type].adc_gnd
= gnd_calib;
} else {
offset = 0;
vref_calib = new_vref_calib;
local_idx = local_idx + 1;
if (local_idx >= QPNP_VADC_RECALIB_MAXCNT) {
@ -1640,6 +1645,7 @@ recalibrate:
pr_debug(
"qpnp vadc recalibration requested,offset:%d\n",
offset);
offset = 0;
goto recalibrate;
}
}