drivers: thermal: tsens: Pass around struct tsens_sensor as a constant

All the sensor data is initialised at init time. Lock it down by passing
it to functions as a constant.
Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/740f9254484c08d65869df578628eb523c0049ff.1584015867.git.amit.kucheria@linaro.org

drivers/thermal/qcom/tsens-8960.c

@@ -245,7 +245,7 @@ static inline int code_to_mdegC(u32 adc_code, const struct tsens_sensor *s)
 	return adc_code * slope + offset;
 }
 
-static int get_temp_8960(struct tsens_sensor *s, int *temp)
+static int get_temp_8960(const struct tsens_sensor *s, int *temp)
 {
 	int ret;
 	u32 code, trdy;

drivers/thermal/qcom/tsens-common.c

@@ -128,7 +128,7 @@ static inline int code_to_degc(u32 adc_code, const struct tsens_sensor *s)
  * Return: Temperature in milliCelsius on success, a negative errno will
  * be returned in error cases
  */
-static int tsens_hw_to_mC(struct tsens_sensor *s, int field)
+static int tsens_hw_to_mC(const struct tsens_sensor *s, int field)
 {
 	struct tsens_priv *priv = s->priv;
 	u32 resolution;
@@ -160,7 +160,7 @@ static int tsens_hw_to_mC(struct tsens_sensor *s, int field)
  *
  * Return: ADC code or temperature in deciCelsius.
  */
-static int tsens_mC_to_hw(struct tsens_sensor *s, int temp)
+static int tsens_mC_to_hw(const struct tsens_sensor *s, int temp)
 {
 	struct tsens_priv *priv = s->priv;
 
@@ -275,7 +275,8 @@ static int tsens_threshold_violated(struct tsens_priv *priv, u32 hw_id,
 }
 
 static int tsens_read_irq_state(struct tsens_priv *priv, u32 hw_id,
-				struct tsens_sensor *s, struct tsens_irq_data *d)
+				const struct tsens_sensor *s,
+				struct tsens_irq_data *d)
 {
 	int ret;
 
@@ -346,10 +347,10 @@ irqreturn_t tsens_irq_thread(int irq, void *data)
 
 	for (i = 0; i < priv->num_sensors; i++) {
 		bool trigger = false;
-		struct tsens_sensor *s = &priv->sensor[i];
+		const struct tsens_sensor *s = &priv->sensor[i];
 		u32 hw_id = s->hw_id;
 
-		if (IS_ERR(priv->sensor[i].tzd))
+		if (IS_ERR(s->tzd))
 			continue;
 		if (!tsens_threshold_violated(priv, hw_id, &d))
 			continue;
@@ -457,7 +458,7 @@ void tsens_disable_irq(struct tsens_priv *priv)
 	regmap_field_write(priv->rf[INT_EN], 0);
 }
 
-int get_temp_tsens_valid(struct tsens_sensor *s, int *temp)
+int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp)
 {
 	struct tsens_priv *priv = s->priv;
 	int hw_id = s->hw_id;
@@ -486,7 +487,7 @@ int get_temp_tsens_valid(struct tsens_sensor *s, int *temp)
 	return 0;
 }
 
-int get_temp_common(struct tsens_sensor *s, int *temp)
+int get_temp_common(const struct tsens_sensor *s, int *temp)
 {
 	struct tsens_priv *priv = s->priv;
 	int hw_id = s->hw_id;

drivers/thermal/qcom/tsens.h

@@ -67,7 +67,7 @@ struct tsens_ops {
 	/* mandatory callbacks */
 	int (*init)(struct tsens_priv *priv);
 	int (*calibrate)(struct tsens_priv *priv);
-	int (*get_temp)(struct tsens_sensor *s, int *temp);
+	int (*get_temp)(const struct tsens_sensor *s, int *temp);
 	/* optional callbacks */
 	int (*enable)(struct tsens_priv *priv, int i);
 	void (*disable)(struct tsens_priv *priv);
@@ -494,8 +494,8 @@ struct tsens_priv {
 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_tsens_valid(struct tsens_sensor *s, int *temp);
-int get_temp_common(struct tsens_sensor *s, int *temp);
+int get_temp_tsens_valid(const struct tsens_sensor *s, int *temp);
+int get_temp_common(const struct tsens_sensor *s, int *temp);
 int tsens_enable_irq(struct tsens_priv *priv);
 void tsens_disable_irq(struct tsens_priv *priv);
 int tsens_set_trips(void *_sensor, int low, int high);