thermal: Add some error messages

When registering a thermal zone device, we currently return -EINVAL in
four cases. This makes it a little hard to debug the real cause of the
failure.

Print some error messages to make it easier for developer to figure out
what happened.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 892f354..d4481cc 100644 (file)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1245,17 +1245,26 @@ thermal_zone_device_register(const char *type, int trips, int mask,
        int count;
        struct thermal_governor *governor;
 
-       if (!type || strlen(type) == 0)
+       if (!type || strlen(type) == 0) {
+               pr_err("Error: No thermal zone type defined\n");
                return ERR_PTR(-EINVAL);
+       }
 
-       if (type && strlen(type) >= THERMAL_NAME_LENGTH)
+       if (type && strlen(type) >= THERMAL_NAME_LENGTH) {
+               pr_err("Error: Thermal zone name (%s) too long, should be under %d chars\n",
+                      type, THERMAL_NAME_LENGTH);
                return ERR_PTR(-EINVAL);
+       }
 
-       if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
+       if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips) {
+               pr_err("Error: Incorrect number of thermal trips\n");
                return ERR_PTR(-EINVAL);
+       }
 
-       if (!ops)
+       if (!ops) {
+               pr_err("Error: Thermal zone device ops not defined\n");
                return ERR_PTR(-EINVAL);
+       }
 
        if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
                return ERR_PTR(-EINVAL);