thermal: sysfs: Add a new sysfs node emul_temp for thermal emulation

This patch adds support to set the emulated temperature method in
thermal zone (sensor). After setting this feature thermal zone may
report this temperature and not the actual temperature. The emulation
implementation may be based on sensor capability through platform
specific handler or pure software emulation if no platform handler defined.

This is useful in debugging different temperature threshold and its
associated cooling action. Critical threshold's cannot be emulated.
Writing 0 on this node should disable emulation.

Signed-off-by: Amit Daniel Kachhap <amit.daniel@samsung.com>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 9b78f8c6f773..f0bd7f90a90d 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -123,6 +123,7 @@ struct thermal_zone_device_ops {
         int (*set_trip_hyst) (struct thermal_zone_device *, int,
                               unsigned long);
         int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
+        int (*set_emul_temp) (struct thermal_zone_device *, unsigned long);
         int (*get_trend) (struct thermal_zone_device *, int,
                           enum thermal_trend *);
         int (*notify) (struct thermal_zone_device *, int,
@@ -165,6 +166,7 @@ struct thermal_zone_device {
         int polling_delay;
         int temperature;
         int last_temperature;
+        int emul_temperature;
         int passive;
         unsigned int forced_passive;
         const struct thermal_zone_device_ops *ops;