[RFC PATCH 01/26] thermal: Introduce thermal_zone_device_register() and params structure

[AngeloGioacchino Del Regno]

In preparation for extending the thermal zone devices to actually have
a name and disambiguation of thermal zone types/names, introduce a new
thermal_zone_device_params structure which holds all of the parameters
that are necessary to register a thermal zone device, then add a new
function thermal_zone_device_register().

The latter takes as parameter the newly introduced structure and is
made to eventually replace all usages of the now deprecated function
thermal_zone_device_register_with_trips() and of
thermal_tripless_zone_device_register().

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
---
 drivers/thermal/thermal_core.c | 27 +++++++++++++++++++++++++++
 include/linux/thermal.h        | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index e5434cdbf23b..6be508eb2d72 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1235,6 +1235,8 @@ EXPORT_SYMBOL_GPL(thermal_zone_get_crit_temp);
  *		   whether trip points have been crossed (0 for interrupt
  *		   driven systems)
  *
+ * This function is deprecated. See thermal_zone_device_register().
+ *
  * This interface function adds a new thermal zone device (sensor) to
  * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
  * thermal cooling devices registered at the same time.
@@ -1409,6 +1411,7 @@ thermal_zone_device_register_with_trips(const char *type, struct thermal_trip *t
 }
 EXPORT_SYMBOL_GPL(thermal_zone_device_register_with_trips);
 
+/* This function is deprecated. See thermal_zone_device_register(). */
 struct thermal_zone_device *thermal_tripless_zone_device_register(
 					const char *type,
 					void *devdata,
@@ -1420,6 +1423,30 @@ struct thermal_zone_device *thermal_tripless_zone_device_register(
 }
 EXPORT_SYMBOL_GPL(thermal_tripless_zone_device_register);
 
+/**
+ * thermal_zone_device_register() - register a new thermal zone device
+ * @tzdp:	Parameters of the new thermal zone device
+ *		See struct thermal_zone_device_register.
+ *
+ * This interface function adds a new thermal zone device (sensor) to
+ * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
+ * thermal cooling devices registered at the same time.
+ * thermal_zone_device_unregister() must be called when the device is no
+ * longer needed. The passive cooling depends on the .get_trend() return value.
+ *
+ * Return: a pointer to the created struct thermal_zone_device or an
+ * in case of error, an ERR_PTR. Caller must check return value with
+ * IS_ERR*() helpers.
+ */
+struct thermal_zone_device *thermal_zone_device_register(struct thermal_zone_device_params *tzdp)
+{
+	return thermal_zone_device_register_with_trips(tzdp->type, tzdp->trips, tzdp->num_trips,
+						       tzdp->mask, tzdp->devdata, tzdp->ops,
+						       &tzdp->tzp, tzdp->passive_delay,
+						       tzdp->polling_delay);
+}
+EXPORT_SYMBOL_GPL(thermal_zone_device_register);
+
 void *thermal_zone_device_priv(struct thermal_zone_device *tzd)
 {
 	return tzd->devdata;
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 98957bae08ff..c6ed33a7e468 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -258,6 +258,33 @@ struct thermal_zone_params {
 	int offset;
 };
 
+/**
+ * struct thermal_zone_device_params - parameters for a thermal zone device
+ * @type:		the thermal zone device type
+ * @tzp:		thermal zone platform parameters
+ * @ops:		standard thermal zone device callbacks
+ * @devdata:		private device data
+ * @trips:		a pointer to an array of thermal trips, if any
+ * @num_trips:		the number of trip points the thermal zone support
+ * @mask:		a bit string indicating the writeablility of trip points
+ * @passive_delay:	number of milliseconds to wait between polls when
+ *			performing passive cooling
+ * @polling_delay:	number of milliseconds to wait between polls when checking
+ *			whether trip points have been crossed (0 for interrupt
+ *			driven systems)
+ */
+struct thermal_zone_device_params {
+	const char *type;
+	struct thermal_zone_params tzp;
+	struct thermal_zone_device_ops *ops;
+	void *devdata;
+	struct thermal_trip *trips;
+	int num_trips;
+	int mask;
+	int passive_delay;
+	int polling_delay;
+};
+
 /* Function declarations */
 #ifdef CONFIG_THERMAL_OF
 struct thermal_zone_device *devm_thermal_of_zone_register(struct device *dev, int id, void *data,
@@ -310,6 +337,8 @@ struct thermal_zone_device *thermal_tripless_zone_device_register(
 					struct thermal_zone_device_ops *ops,
 					const struct thermal_zone_params *tzp);
 
+struct thermal_zone_device *thermal_zone_device_register(struct thermal_zone_device_params *tzdp);
+
 void thermal_zone_device_unregister(struct thermal_zone_device *tz);
 
 void *thermal_zone_device_priv(struct thermal_zone_device *tzd);
@@ -372,6 +401,10 @@ static inline struct thermal_zone_device *thermal_tripless_zone_device_register(
 					const struct thermal_zone_params *tzp)
 { return ERR_PTR(-ENODEV); }
 
+static inline struct thermal_zone_device *thermal_zone_device_register(
+					struct thermal_zone_device_params *tzdp)
+{ return ERR_PTR(-ENODEV); }
+
 static inline void thermal_zone_device_unregister(struct thermal_zone_device *tz)
 { }
 
-- 
2.43.0