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iio: adc: qcom-vadc-common: simplify qcom_vadc_map_voltage_temp
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>
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@ -346,38 +346,19 @@ static struct qcom_adc5_scale_type scale_adc5_fn[] = {
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static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts,
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u32 tablesize, s32 input, int *output)
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{
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bool descending = 1;
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u32 i = 0;
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if (!pts)
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return -EINVAL;
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/* Check if table is descending or ascending */
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if (tablesize > 1) {
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if (pts[0].x < pts[1].x)
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descending = 0;
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}
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while (i < tablesize) {
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if ((descending) && (pts[i].x < input)) {
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/* table entry is less than measured*/
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/* value and table is descending, stop */
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break;
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} else if ((!descending) &&
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(pts[i].x > input)) {
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/* table entry is greater than measured*/
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/*value and table is ascending, stop */
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break;
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}
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while (i < tablesize && pts[i].x > input)
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i++;
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}
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if (i == 0) {
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*output = pts[0].y;
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} else if (i == tablesize) {
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*output = pts[tablesize - 1].y;
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} else {
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/* result is between search_index and search_index-1 */
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/* interpolate linearly */
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*output = fixp_linear_interpolate(pts[i - 1].x, pts[i - 1].y,
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pts[i].x, pts[i].y,
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