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From:   Amit Kucheria <amit.kucheria@linaro.org>
To:     linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        bjorn.andersson@linaro.org, edubezval@gmail.com,
        andy.gross@linaro.org, Daniel Lezcano <daniel.lezcano@linaro.org>,
        David Brown <david.brown@linaro.org>,
        Zhang Rui <rui.zhang@intel.com>
Cc:     linux-pm@vger.kernel.org
Subject: [PATCH v1 14/24] drivers: thermal: tsens: Add new operation to check if a sensor is enabled
Date:   Thu,  7 Feb 2019 16:19:32 +0530
Message-Id: <f8dd502d2981590526f9c2e44fbb4c0d36a3aa0c.1549525708.git.amit.kucheria@linaro.org>
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is_sensor_enabled() checks if the sensors are enabled on this platform.
It is possible that the SoC might choose not to enable all the sensors
that the IP block is capable of supporting.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
---
 drivers/thermal/qcom/tsens-common.c | 14 ++++++++++++++
 drivers/thermal/qcom/tsens-v0_1.c   |  1 +
 drivers/thermal/qcom/tsens-v2.c     |  1 +
 drivers/thermal/qcom/tsens.c        |  5 +++++
 drivers/thermal/qcom/tsens.h        |  1 +
 5 files changed, 22 insertions(+)

diff --git a/drivers/thermal/qcom/tsens-common.c b/drivers/thermal/qcom/tsens-common.c
index 39cd5733fd44..020409d8daf0 100644
--- a/drivers/thermal/qcom/tsens-common.c
+++ b/drivers/thermal/qcom/tsens-common.c
@@ -69,6 +69,20 @@ void compute_intercept_slope(struct tsens_priv *priv, u32 *p1,
 	}
 }
 
+bool is_sensor_enabled(struct tsens_priv *priv, u32 hw_id)
+{
+	u32 val;
+	int ret;
+
+	if ((hw_id > (priv->num_sensors - 1)) || (hw_id < 0))
+		return -EINVAL;
+	ret = regmap_field_read(priv->rf[SENSOR_EN], &val);
+	if (ret)
+		return ret;
+
+	return val & (1 << hw_id);
+}
+
 static inline int code_to_degc(u32 adc_code, const struct tsens_sensor *s)
 {
 	int degc, num, den;
diff --git a/drivers/thermal/qcom/tsens-v0_1.c b/drivers/thermal/qcom/tsens-v0_1.c
index 02907751c201..ad1052e05e45 100644
--- a/drivers/thermal/qcom/tsens-v0_1.c
+++ b/drivers/thermal/qcom/tsens-v0_1.c
@@ -332,6 +332,7 @@ const struct reg_field tsens_v0_1_regfields[MAX_REGFIELDS] = {
 	/* CTRL_OFFSET */
 	[TSENS_EN]     = REG_FIELD(SROT_CTRL_OFF, 0,  0),
 	[TSENS_SW_RST] = REG_FIELD(SROT_CTRL_OFF, 1,  1),
+	[SENSOR_EN]    = REG_FIELD(SROT_CTRL_OFF, 3, 13),
 
 	/* ----- TM ------ */
 	/* UPPER_LOWER_INTERRUPT_CTRL */
diff --git a/drivers/thermal/qcom/tsens-v2.c b/drivers/thermal/qcom/tsens-v2.c
index 962e47c54dca..e0aac59d72ec 100644
--- a/drivers/thermal/qcom/tsens-v2.c
+++ b/drivers/thermal/qcom/tsens-v2.c
@@ -99,6 +99,7 @@ const struct reg_field tsens_v2_regfields[MAX_REGFIELDS] = {
 	/* CTRL_OFF */
 	[TSENS_EN]     = REG_FIELD(SROT_CTRL_OFF,    0,  0),
 	[TSENS_SW_RST] = REG_FIELD(SROT_CTRL_OFF,    1,  1),
+	[SENSOR_EN]    = REG_FIELD(SROT_CTRL_OFF,    3, 18),
 
 	/* ----- TM ------ */
 	/* INTERRUPT ENABLE */
diff --git a/drivers/thermal/qcom/tsens.c b/drivers/thermal/qcom/tsens.c
index 057b33353ba3..fc44cac31fa5 100644
--- a/drivers/thermal/qcom/tsens.c
+++ b/drivers/thermal/qcom/tsens.c
@@ -82,6 +82,11 @@ static int tsens_register(struct tsens_priv *priv)
 	struct thermal_zone_device *tzd;
 
 	for (i = 0;  i < priv->num_sensors; i++) {
+		if (!is_sensor_enabled(priv, priv->sensor[i].hw_id)) {
+			dev_err(priv->dev, "sensor %d: disabled\n",
+				priv->sensor[i].hw_id);
+			continue;
+		}
 		priv->sensor[i].priv = priv;
 		priv->sensor[i].id = i;
 		tzd = devm_thermal_zone_of_sensor_register(priv->dev, i,
diff --git a/drivers/thermal/qcom/tsens.h b/drivers/thermal/qcom/tsens.h
index 20d89f8a6c3e..da4cfb23dfe9 100644
--- a/drivers/thermal/qcom/tsens.h
+++ b/drivers/thermal/qcom/tsens.h
@@ -254,6 +254,7 @@ char *qfprom_read(struct device *dev, const char *cname);
 void compute_intercept_slope(struct tsens_priv *priv, u32 *pt1, u32 *pt2, u32 mode);
 int init_common(struct tsens_priv *priv);
 int get_temp_common(struct tsens_priv *priv, int i, int *temp);
+bool is_sensor_enabled(struct tsens_priv *priv, u32 hw_id);
 
 /* TSENS target */
 extern const struct tsens_plat_data data_8960;
-- 
2.17.1