linux-kernel - [PATCH v3 7/7] drivers: thermal: tsens: add set

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Date:   Thu, 16 Jul 2020 00:45:02 +0200
From:   Ansuel Smith <ansuelsmth@...il.com>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Ansuel Smith <ansuelsmth@...il.com>,
        Amit Kucheria <amit.kucheria@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-pm@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Subject: [PATCH v3 7/7] drivers: thermal: tsens: add set_trip support for 8960

Add custom set_trip function for 8960 needed to set trip point to the
tsens driver for 8960 driver.

Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
---
 drivers/thermal/qcom/tsens-8960.c | 78 +++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)

diff --git a/drivers/thermal/qcom/tsens-8960.c b/drivers/thermal/qcom/tsens-8960.c
index b302bfb924a6..f6ed2450a7ba 100644
--- a/drivers/thermal/qcom/tsens-8960.c
+++ b/drivers/thermal/qcom/tsens-8960.c
@@ -93,6 +93,15 @@
 						TSENS_8064_SENSOR9_EN | \
 						TSENS_8064_SENSOR10_EN)
 
+/* Trips: from very hot to very cold */
+enum tsens_trip_type {
+	TSENS_TRIP_STAGE3 = 0,
+	TSENS_TRIP_STAGE2,
+	TSENS_TRIP_STAGE1,
+	TSENS_TRIP_STAGE0,
+	TSENS_TRIP_NUM,
+};
+
 u32 tsens_8960_slope[] = {
 			1176, 1176, 1154, 1176,
 			1111, 1132, 1132, 1199,
@@ -110,6 +119,16 @@ static inline int code_to_mdegC(u32 adc_code, const struct tsens_sensor *s)
 	return adc_code * slope + offset;
 }
 
+static int mdegC_to_code(int degC, const struct tsens_sensor *s)
+{
+	int slope, offset;
+
+	slope = thermal_zone_get_slope(s->tzd);
+	offset = CAL_MDEGC - slope * s->offset;
+
+	return degC / slope - offset;
+}
+
 static void notify_uspace_tsens_fn(struct work_struct *work)
 {
 	struct tsens_sensor *s = container_of(work, struct tsens_sensor,
@@ -447,6 +466,64 @@ static int get_temp_8960(const struct tsens_sensor *s, int *temp)
 	return -ETIMEDOUT;
 }
 
+static int set_trip_temp_ipq8064(void *data, int trip, int temp)
+{
+	unsigned int reg_th, reg_cntl;
+	int ret, code, code_chk, hi_code, lo_code;
+	const struct tsens_sensor *s = data;
+	struct tsens_priv *priv = s->priv;
+
+	code = mdegC_to_code(temp, s);
+	code_chk = code;
+
+	if (code < THRESHOLD_MIN_CODE || code > THRESHOLD_MAX_CODE)
+		return -EINVAL;
+
+	ret = regmap_read(priv->tm_map, STATUS_CNTL_ADDR_8064, &reg_cntl);
+	if (ret)
+		return ret;
+
+	ret = regmap_read(priv->tm_map, THRESHOLD_ADDR, &reg_th);
+	if (ret)
+		return ret;
+
+	hi_code = (reg_th & THRESHOLD_UPPER_LIMIT_MASK)
+			>> THRESHOLD_UPPER_LIMIT_SHIFT;
+	lo_code = (reg_th & THRESHOLD_LOWER_LIMIT_MASK)
+			>> THRESHOLD_LOWER_LIMIT_SHIFT;
+
+	switch (trip) {
+	case TSENS_TRIP_STAGE3:
+		code <<= THRESHOLD_MAX_LIMIT_SHIFT;
+		reg_th &= ~THRESHOLD_MAX_LIMIT_MASK;
+		break;
+	case TSENS_TRIP_STAGE2:
+		if (code_chk <= lo_code)
+			return -EINVAL;
+		code <<= THRESHOLD_UPPER_LIMIT_SHIFT;
+		reg_th &= ~THRESHOLD_UPPER_LIMIT_MASK;
+		break;
+	case TSENS_TRIP_STAGE1:
+		if (code_chk >= hi_code)
+			return -EINVAL;
+		code <<= THRESHOLD_LOWER_LIMIT_SHIFT;
+		reg_th &= ~THRESHOLD_LOWER_LIMIT_MASK;
+		break;
+	case TSENS_TRIP_STAGE0:
+		code <<= THRESHOLD_MIN_LIMIT_SHIFT;
+		reg_th &= ~THRESHOLD_MIN_LIMIT_MASK;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = regmap_write(priv->tm_map, THRESHOLD_ADDR, reg_th | code);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 static const struct tsens_ops ops_8960 = {
 	.init		= init_8960,
 	.calibrate	= calibrate_8960,
@@ -455,6 +532,7 @@ static const struct tsens_ops ops_8960 = {
 	.disable	= disable_8960,
 	.suspend	= suspend_8960,
 	.resume		= resume_8960,
+	.set_trip_temp	= set_trip_temp_ipq8064,
 };
 
 struct tsens_plat_data data_8960 = {
-- 
2.27.0