In current version of the driver there is error in temperature
calculation.
So lets fix it using proper linear function.
Signed-off-by: Paweł Jarosz <paweljarosz3691@xxxxxxxxx>
---
drivers/thermal/thermal-generic-adc.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/thermal/thermal-generic-adc.c b/drivers/thermal/thermal-generic-adc.c
index 73f55d6..1190aee 100644
--- a/drivers/thermal/thermal-generic-adc.c
+++ b/drivers/thermal/thermal-generic-adc.c
@@ -26,7 +26,7 @@ struct gadc_thermal_info {
static int gadc_thermal_adc_to_temp(struct gadc_thermal_info *gti, int val)
{
- int temp, adc_hi, adc_lo;
+ int temp, adc1, adc2, temp1, temp2;
int i;
for (i = 0; i < gti->nlookup_table; i++) {
@@ -39,10 +39,13 @@ static int gadc_thermal_adc_to_temp(struct gadc_thermal_info *gti, int val)
} else if (i >= (gti->nlookup_table - 1)) {
temp = gti->lookup_table[2 * (gti->nlookup_table - 1)];
} else {
- adc_hi = gti->lookup_table[2 * i - 1];
- adc_lo = gti->lookup_table[2 * i + 1];
- temp = gti->lookup_table[2 * i];
- temp -= ((val - adc_lo) * 1000) / (adc_hi - adc_lo);
+ adc1 = gti->lookup_table[2 * i - 1];
+ adc2 = gti->lookup_table[2 * i + 1];
+
+ temp1 = gti->lookup_table[2 * i - 2];
+ temp2 = gti->lookup_table[2 * i];
+
+ temp = (val - adc1) * (temp2 - temp1) / (adc2 - adc1) + temp1;
}
return temp;
--
2.7.4
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