![Linus Walleij](/assets/img/avatar_default.png)
The module license checker complains about these two so just fix it up. They are both GPLv2, both written by me or using code I extracted while refactoring from the GPLv2 drivers. Cc: Randy Dunlap <rdunlap@infradead.org> Reported-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
236 lines
5.2 KiB
C
236 lines
5.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/bug.h>
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#include <linux/kernel.h>
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#include <linux/bitops.h>
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#include <linux/math64.h>
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#include <linux/log2.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include "qcom-vadc-common.h"
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/* Voltage to temperature */
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static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {
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{1758, -40},
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{1742, -35},
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{1719, -30},
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{1691, -25},
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{1654, -20},
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{1608, -15},
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{1551, -10},
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{1483, -5},
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{1404, 0},
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{1315, 5},
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{1218, 10},
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{1114, 15},
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{1007, 20},
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{900, 25},
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{795, 30},
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{696, 35},
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{605, 40},
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{522, 45},
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{448, 50},
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{383, 55},
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{327, 60},
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{278, 65},
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{237, 70},
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{202, 75},
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{172, 80},
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{146, 85},
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{125, 90},
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{107, 95},
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{92, 100},
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{79, 105},
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{68, 110},
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{59, 115},
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{51, 120},
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{44, 125}
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};
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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, s64 *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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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 = (((s32)((pts[i].y - pts[i - 1].y) *
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(input - pts[i - 1].x)) /
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(pts[i].x - pts[i - 1].x)) +
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pts[i - 1].y);
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}
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return 0;
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}
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static void qcom_vadc_scale_calib(const struct vadc_linear_graph *calib_graph,
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u16 adc_code,
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bool absolute,
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s64 *scale_voltage)
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{
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*scale_voltage = (adc_code - calib_graph->gnd);
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*scale_voltage *= calib_graph->dx;
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*scale_voltage = div64_s64(*scale_voltage, calib_graph->dy);
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if (absolute)
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*scale_voltage += calib_graph->dx;
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if (*scale_voltage < 0)
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*scale_voltage = 0;
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}
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static int qcom_vadc_scale_volt(const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute, u16 adc_code,
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int *result_uv)
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{
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s64 voltage = 0, result = 0;
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qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
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voltage = voltage * prescale->den;
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result = div64_s64(voltage, prescale->num);
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*result_uv = result;
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return 0;
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}
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static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute, u16 adc_code,
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int *result_mdec)
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{
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s64 voltage = 0, result = 0;
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int ret;
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qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
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if (absolute)
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voltage = div64_s64(voltage, 1000);
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ret = qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb,
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ARRAY_SIZE(adcmap_100k_104ef_104fb),
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voltage, &result);
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if (ret)
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return ret;
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result *= 1000;
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*result_mdec = result;
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return 0;
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}
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static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute,
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u16 adc_code, int *result_mdec)
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{
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s64 voltage = 0;
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u64 temp; /* Temporary variable for do_div */
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qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
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if (voltage > 0) {
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temp = voltage * prescale->den;
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do_div(temp, prescale->num * 2);
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voltage = temp;
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} else {
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voltage = 0;
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}
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voltage -= KELVINMIL_CELSIUSMIL;
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*result_mdec = voltage;
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return 0;
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}
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static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute,
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u16 adc_code, int *result_mdec)
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{
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s64 voltage = 0, result = 0;
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qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
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voltage = voltage * prescale->den;
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voltage = div64_s64(voltage, prescale->num);
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voltage = ((PMI_CHG_SCALE_1) * (voltage * 2));
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voltage = (voltage + PMI_CHG_SCALE_2);
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result = div64_s64(voltage, 1000000);
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*result_mdec = result;
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return 0;
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}
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int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
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const struct vadc_linear_graph *calib_graph,
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const struct vadc_prescale_ratio *prescale,
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bool absolute,
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u16 adc_code, int *result)
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{
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switch (scaletype) {
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case SCALE_DEFAULT:
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return qcom_vadc_scale_volt(calib_graph, prescale,
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absolute, adc_code,
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result);
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case SCALE_THERM_100K_PULLUP:
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case SCALE_XOTHERM:
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return qcom_vadc_scale_therm(calib_graph, prescale,
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absolute, adc_code,
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result);
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case SCALE_PMIC_THERM:
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return qcom_vadc_scale_die_temp(calib_graph, prescale,
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absolute, adc_code,
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result);
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case SCALE_PMI_CHG_TEMP:
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return qcom_vadc_scale_chg_temp(calib_graph, prescale,
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absolute, adc_code,
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result);
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default:
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return -EINVAL;
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}
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}
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EXPORT_SYMBOL(qcom_vadc_scale);
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int qcom_vadc_decimation_from_dt(u32 value)
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{
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if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||
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value > VADC_DECIMATION_MAX)
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return -EINVAL;
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return __ffs64(value / VADC_DECIMATION_MIN);
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}
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EXPORT_SYMBOL(qcom_vadc_decimation_from_dt);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Qualcomm ADC common functionality");
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