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iio: adc: qcom-vadc-common: simplify qcom_vadc_map_voltage_temp

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All volt-temp tables here are sorted in descending order. There is no
need to accout for (unused) ascending table sorting case, so simplify
the conversion function.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20201204025509.1075506-11-dmitry.baryshkov@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Dmitry Baryshkov
2020-12-04 05:55:04 +03:00
committed by Jonathan Cameron
parent 3bd0ceb566
commit 48d2e2ff85
1 changed files with 1 additions and 20 deletions
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21
drivers/iio/adc/qcom-vadc-common.c
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@@ -346,38 +346,19 @@ static struct qcom_adc5_scale_type scale_adc5_fn[] = {
static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts, static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts,
u32 tablesize, s32 input, int *output) u32 tablesize, s32 input, int *output)
{ {
bool descending = 1;
u32 i = 0; u32 i = 0;
if (!pts) if (!pts)
return -EINVAL; return -EINVAL;
/* Check if table is descending or ascending */ while (i < tablesize && pts[i].x > input)
if (tablesize > 1) {
if (pts[0].x < pts[1].x)
descending = 0;
}
while (i < tablesize) {
if ((descending) && (pts[i].x < input)) {
/* table entry is less than measured*/
/* value and table is descending, stop */
break;
} else if ((!descending) &&
(pts[i].x > input)) {
/* table entry is greater than measured*/
/*value and table is ascending, stop */
break;
}
i++; i++;
}
if (i == 0) { if (i == 0) {
*output = pts[0].y; *output = pts[0].y;
} else if (i == tablesize) { } else if (i == tablesize) {
*output = pts[tablesize - 1].y; *output = pts[tablesize - 1].y;
} else { } else {
/* result is between search_index and search_index-1 */
/* interpolate linearly */ /* interpolate linearly */
*output = fixp_linear_interpolate(pts[i - 1].x, pts[i - 1].y, *output = fixp_linear_interpolate(pts[i - 1].x, pts[i - 1].y,
pts[i].x, pts[i].y, pts[i].x, pts[i].y,