[PATCH] thermal: rcar: add .set_trip_temp support

[Kuninori Morimoto]

From: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>

You can set trip temp if your kernel has CONFIG_THERMAL_WRITABLE_TRIPS

echo $temp > /sys/class/thermal/thermal_zone0/trip_point_0_temp

-45000 < $temp < 125000 is supported
Default is 90000

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@xxxxxxxxxxx>
---
  This patch is v2 of "[PATCH] thermal: rcar: enable to set tripN-temp via DT"
  I think it will be full-DT feature if it uses of-thermal, but this driver is used
  from non-DT SoC too. We would like to keep non-DT support.
  And we would like to do is only exchange trip temp.
  .set_trip_temp is very enouth for it at this point.
  But, it can use of-thermal feature in the future.

 drivers/thermal/rcar_thermal.c | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
index 5d4ae7d..1eaa1be 100644
--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -63,6 +63,7 @@ struct rcar_thermal_priv {
 	struct mutex lock;
 	struct list_head list;
 	int id;
+	int trip_temp;
 	u32 ctemp;
 };
 
@@ -222,7 +223,7 @@ static int rcar_thermal_get_trip_type(struct thermal_zone_device *zone,
 
 	/* see rcar_thermal_get_temp() */
 	switch (trip) {
-	case 0: /* +90 <= temp */
+	case 0:
 		*type = THERMAL_TRIP_CRITICAL;
 		break;
 	default:
@@ -241,8 +242,8 @@ static int rcar_thermal_get_trip_temp(struct thermal_zone_device *zone,
 
 	/* see rcar_thermal_get_temp() */
 	switch (trip) {
-	case 0: /* +90 <= temp */
-		*temp = MCELSIUS(90);
+	case 0:
+		*temp = priv->trip_temp;
 		break;
 	default:
 		dev_err(dev, "rcar driver trip error\n");
@@ -270,10 +271,27 @@ static int rcar_thermal_notify(struct thermal_zone_device *zone,
 	return 0;
 }
 
+static int rcar_thermal_set_trip_temp(struct thermal_zone_device *zone,
+				    int trip, int temp)
+{
+	struct rcar_thermal_priv *priv = rcar_zone_to_priv(zone);
+
+	if (trip != 0)
+		return -EINVAL;
+
+	if (temp < -45000 || temp > 125000)
+		return -EINVAL;
+
+	priv->trip_temp = temp;
+
+	return 0;
+}
+
 static struct thermal_zone_device_ops rcar_thermal_zone_ops = {
 	.get_temp	= rcar_thermal_get_temp,
 	.get_trip_type	= rcar_thermal_get_trip_type,
 	.get_trip_temp	= rcar_thermal_get_trip_temp,
+	.set_trip_temp	= rcar_thermal_set_trip_temp,
 	.notify		= rcar_thermal_notify,
 };
 
@@ -418,13 +436,14 @@ static int rcar_thermal_probe(struct platform_device *pdev)
 
 		priv->common = common;
 		priv->id = i;
+		priv->trip_temp = MCELSIUS(90); /* default*/
 		mutex_init(&priv->lock);
 		INIT_LIST_HEAD(&priv->list);
 		INIT_DELAYED_WORK(&priv->work, rcar_thermal_work);
 		rcar_thermal_update_temp(priv);
 
 		priv->zone = thermal_zone_device_register("rcar_thermal",
-						1, 0, priv,
+						1, 1, priv,
 						&rcar_thermal_zone_ops, NULL, 0,
 						idle);
 		if (IS_ERR(priv->zone)) {
-- 
1.9.1

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