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, 8 insertions, 0 deletions

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index faf38c522fa8..e4cf7fbc3a59 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -78,6 +78,14 @@ config CPU_THERMAL
           and not the ACPI interface.
           If you want this support, you should say Y here.
 
+config THERMAL_EMULATION
+        bool "Thermal emulation mode support"
+        help
+          Enable this option to make a emul_temp sysfs node in thermal zone
+          directory to support temperature emulation. With emulation sysfs node,
+          user can manually input temperature and test the different trip
+          threshold behaviour for simulation purpose.
+
 config SPEAR_THERMAL
         bool "SPEAr thermal sensor driver"
         depends on PLAT_SPEAR