Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 235 insertions, 0 deletions

diff --git a/drivers/iio/adc/qcom-vadc-common.c b/drivers/iio/adc/qcom-vadc-common.c
new file mode 100644
index 000000000..fe3d78267
--- /dev/null
+++ b/drivers/iio/adc/qcom-vadc-common.c
@@ -0,0 +1,235 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/bug.h>
+#include <linux/kernel.h>
+#include <linux/bitops.h>
+#include <linux/math64.h>
+#include <linux/log2.h>
+#include <linux/err.h>
+#include <linux/module.h>
+
+#include "qcom-vadc-common.h"
+
+/* Voltage to temperature */
+static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = {
+	{1758,	-40},
+	{1742,	-35},
+	{1719,	-30},
+	{1691,	-25},
+	{1654,	-20},
+	{1608,	-15},
+	{1551,	-10},
+	{1483,	-5},
+	{1404,	0},
+	{1315,	5},
+	{1218,	10},
+	{1114,	15},
+	{1007,	20},
+	{900,	25},
+	{795,	30},
+	{696,	35},
+	{605,	40},
+	{522,	45},
+	{448,	50},
+	{383,	55},
+	{327,	60},
+	{278,	65},
+	{237,	70},
+	{202,	75},
+	{172,	80},
+	{146,	85},
+	{125,	90},
+	{107,	95},
+	{92,	100},
+	{79,	105},
+	{68,	110},
+	{59,	115},
+	{51,	120},
+	{44,	125}
+};
+
+static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts,
+				      u32 tablesize, s32 input, s64 *output)
+{
+	bool descending = 1;
+	u32 i = 0;
+
+	if (!pts)
+		return -EINVAL;
+
+	/* Check if table is descending or ascending */
+	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++;
+	}
+
+	if (i == 0) {
+		*output = pts[0].y;
+	} else if (i == tablesize) {
+		*output = pts[tablesize - 1].y;
+	} else {
+		/* result is between search_index and search_index-1 */
+		/* interpolate linearly */
+		*output = (((s32)((pts[i].y - pts[i - 1].y) *
+			(input - pts[i - 1].x)) /
+			(pts[i].x - pts[i - 1].x)) +
+			pts[i - 1].y);
+	}
+
+	return 0;
+}
+
+static void qcom_vadc_scale_calib(const struct vadc_linear_graph *calib_graph,
+				  u16 adc_code,
+				  bool absolute,
+				  s64 *scale_voltage)
+{
+	*scale_voltage = (adc_code - calib_graph->gnd);
+	*scale_voltage *= calib_graph->dx;
+	*scale_voltage = div64_s64(*scale_voltage, calib_graph->dy);
+	if (absolute)
+		*scale_voltage += calib_graph->dx;
+
+	if (*scale_voltage < 0)
+		*scale_voltage = 0;
+}
+
+static int qcom_vadc_scale_volt(const struct vadc_linear_graph *calib_graph,
+				const struct vadc_prescale_ratio *prescale,
+				bool absolute, u16 adc_code,
+				int *result_uv)
+{
+	s64 voltage = 0, result = 0;
+
+	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
+
+	voltage = voltage * prescale->den;
+	result = div64_s64(voltage, prescale->num);
+	*result_uv = result;
+
+	return 0;
+}
+
+static int qcom_vadc_scale_therm(const struct vadc_linear_graph *calib_graph,
+				 const struct vadc_prescale_ratio *prescale,
+				 bool absolute, u16 adc_code,
+				 int *result_mdec)
+{
+	s64 voltage = 0, result = 0;
+	int ret;
+
+	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
+
+	if (absolute)
+		voltage = div64_s64(voltage, 1000);
+
+	ret = qcom_vadc_map_voltage_temp(adcmap_100k_104ef_104fb,
+					 ARRAY_SIZE(adcmap_100k_104ef_104fb),
+					 voltage, &result);
+	if (ret)
+		return ret;
+
+	result *= 1000;
+	*result_mdec = result;
+
+	return 0;
+}
+
+static int qcom_vadc_scale_die_temp(const struct vadc_linear_graph *calib_graph,
+				    const struct vadc_prescale_ratio *prescale,
+				    bool absolute,
+				    u16 adc_code, int *result_mdec)
+{
+	s64 voltage = 0;
+	u64 temp; /* Temporary variable for do_div */
+
+	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
+
+	if (voltage > 0) {
+		temp = voltage * prescale->den;
+		do_div(temp, prescale->num * 2);
+		voltage = temp;
+	} else {
+		voltage = 0;
+	}
+
+	voltage -= KELVINMIL_CELSIUSMIL;
+	*result_mdec = voltage;
+
+	return 0;
+}
+
+static int qcom_vadc_scale_chg_temp(const struct vadc_linear_graph *calib_graph,
+				    const struct vadc_prescale_ratio *prescale,
+				    bool absolute,
+				    u16 adc_code, int *result_mdec)
+{
+	s64 voltage = 0, result = 0;
+
+	qcom_vadc_scale_calib(calib_graph, adc_code, absolute, &voltage);
+
+	voltage = voltage * prescale->den;
+	voltage = div64_s64(voltage, prescale->num);
+	voltage = ((PMI_CHG_SCALE_1) * (voltage * 2));
+	voltage = (voltage + PMI_CHG_SCALE_2);
+	result =  div64_s64(voltage, 1000000);
+	*result_mdec = result;
+
+	return 0;
+}
+
+int qcom_vadc_scale(enum vadc_scale_fn_type scaletype,
+		    const struct vadc_linear_graph *calib_graph,
+		    const struct vadc_prescale_ratio *prescale,
+		    bool absolute,
+		    u16 adc_code, int *result)
+{
+	switch (scaletype) {
+	case SCALE_DEFAULT:
+		return qcom_vadc_scale_volt(calib_graph, prescale,
+					    absolute, adc_code,
+					    result);
+	case SCALE_THERM_100K_PULLUP:
+	case SCALE_XOTHERM:
+		return qcom_vadc_scale_therm(calib_graph, prescale,
+					     absolute, adc_code,
+					     result);
+	case SCALE_PMIC_THERM:
+		return qcom_vadc_scale_die_temp(calib_graph, prescale,
+						absolute, adc_code,
+						result);
+	case SCALE_PMI_CHG_TEMP:
+		return qcom_vadc_scale_chg_temp(calib_graph, prescale,
+						absolute, adc_code,
+						result);
+	default:
+		return -EINVAL;
+	}
+}
+EXPORT_SYMBOL(qcom_vadc_scale);
+
+int qcom_vadc_decimation_from_dt(u32 value)
+{
+	if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN ||
+	    value > VADC_DECIMATION_MAX)
+		return -EINVAL;
+
+	return __ffs64(value / VADC_DECIMATION_MIN);
+}
+EXPORT_SYMBOL(qcom_vadc_decimation_from_dt);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Qualcomm ADC common functionality");