X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=drivers%2Facpi%2Fthermal.c;h=84c795fb9b1ebef3a787907ba372cc368923a6c2;hb=a39a2d7c72b358c6253a2ec28e17b023b7f6f41c;hp=0815ac3ae3d6c49a1a46282b0cfaea2418ddca6b;hpb=7cece14acd063dd1c4e8933461d44ec6a5a5517b;p=linux-2.6-omap-h63xx.git

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 0815ac3ae3d..84c795fb9b1 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -364,10 +364,17 @@ static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
 	if (flag & ACPI_TRIPS_CRITICAL) {
 		status = acpi_evaluate_integer(tz->device->handle,
 				"_CRT", NULL, &tz->trips.critical.temperature);
-		if (ACPI_FAILURE(status)) {
+		/*
+		 * Treat freezing temperatures as invalid as well; some
+		 * BIOSes return really low values and cause reboots at startup.
+		 * Below zero (Celcius) values clearly aren't right for sure..
+		 * ... so lets discard those as invalid.
+		 */
+		if (ACPI_FAILURE(status) ||
+				tz->trips.critical.temperature <= 2732) {
 			tz->trips.critical.flags.valid = 0;
 			ACPI_EXCEPTION((AE_INFO, status,
-					"No critical threshold"));
+					"No or invalid critical threshold"));
 			return -ENODEV;
 		} else {
 			tz->trips.critical.flags.valid = 1;
@@ -889,10 +896,15 @@ static void acpi_thermal_check(void *data)
 static int thermal_get_temp(struct thermal_zone_device *thermal, char *buf)
 {
 	struct acpi_thermal *tz = thermal->devdata;
+	int result;
 
 	if (!tz)
 		return -EINVAL;
 
+	result = acpi_thermal_get_temperature(tz);
+	if (result)
+		return result;
+
 	return sprintf(buf, "%ld\n", KELVIN_TO_MILLICELSIUS(tz->temperature));
 }
 
@@ -1017,6 +1029,18 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
 	return -EINVAL;
 }
 
+static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
+				unsigned long *temperature) {
+	struct acpi_thermal *tz = thermal->devdata;
+
+	if (tz->trips.critical.flags.valid) {
+		*temperature = KELVIN_TO_MILLICELSIUS(
+				tz->trips.critical.temperature);
+		return 0;
+	} else
+		return -EINVAL;
+}
+
 typedef int (*cb)(struct thermal_zone_device *, int,
 		  struct thermal_cooling_device *);
 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
@@ -1108,6 +1132,7 @@ static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
 	.set_mode = thermal_set_mode,
 	.get_trip_type = thermal_get_trip_type,
 	.get_trip_temp = thermal_get_trip_temp,
+	.get_crit_temp = thermal_get_crit_temp,
 };
 
 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
@@ -1128,7 +1153,7 @@ static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
 
 	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
 			tz->trips.active[i].flags.valid; i++, trips++);
-	tz->thermal_zone = thermal_zone_device_register("ACPI thermal zone",
+	tz->thermal_zone = thermal_zone_device_register("acpitz",
 					trips, tz, &acpi_thermal_zone_ops);
 	if (IS_ERR(tz->thermal_zone))
 		return -ENODEV;