Thermal: int340x_thermal: expose acpi thermal relationship tables

ACPI 4.0 introduced two thermal relationship tables via _ART
(active cooling) and  _TRT (passive cooling) objects. These
tables contain many to many relationships among thermal sensors
and cooling devices.

This patch parses _ART and _TRT and makes the result available to
the userspace via an misc device interface. At the same time,
kernel drivers can also request parsing results from internal
kernel APIs.

The results include source and target devices, influence, and
sampling rate in case of _TRT. For _ART, the result shows source
device, target device, and weight percentage.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/Kconfig

@@ -223,6 +223,7 @@ config INT340X_THERMAL
 	tristate "ACPI INT340X thermal drivers"
 	depends on X86 && ACPI
 	select THERMAL_GOV_USER_SPACE
+	select ACPI_THERMAL_REL
 	help
 	  Newer laptops and tablets that use ACPI may have thermal sensors and
 	  other devices with thermal control capabilities outside the core
@@ -237,6 +238,10 @@ config INT340X_THERMAL
 	  information to allow the user to select his laptop to run without
 	  turning on the fans.
 
+config ACPI_THERMAL_REL
+	tristate
+	depends on ACPI
+
 menu "Texas Instruments thermal drivers"
 source "drivers/thermal/ti-soc-thermal/Kconfig"
 endmenu

drivers/thermal/int340x_thermal/Makefile

 obj-$(CONFIG_INT340X_THERMAL)	+= int3400_thermal.o
 obj-$(CONFIG_INT340X_THERMAL)	+= int3402_thermal.o
 obj-$(CONFIG_INT340X_THERMAL)	+= int3403_thermal.o
+obj-$(CONFIG_ACPI_THERMAL_REL)	+= acpi_thermal_rel.o

drivers/thermal/int340x_thermal/acpi_thermal_rel.h

+#ifndef __ACPI_ACPI_THERMAL_H
+#define __ACPI_ACPI_THERMAL_H
+
+#include <asm/ioctl.h>
+
+#define ACPI_THERMAL_MAGIC 's'
+
+#define ACPI_THERMAL_GET_TRT_LEN _IOR(ACPI_THERMAL_MAGIC, 1, unsigned long)
+#define ACPI_THERMAL_GET_ART_LEN _IOR(ACPI_THERMAL_MAGIC, 2, unsigned long)
+#define ACPI_THERMAL_GET_TRT_COUNT _IOR(ACPI_THERMAL_MAGIC, 3, unsigned long)
+#define ACPI_THERMAL_GET_ART_COUNT _IOR(ACPI_THERMAL_MAGIC, 4, unsigned long)
+
+#define ACPI_THERMAL_GET_TRT	_IOR(ACPI_THERMAL_MAGIC, 5, unsigned long)
+#define ACPI_THERMAL_GET_ART	_IOR(ACPI_THERMAL_MAGIC, 6, unsigned long)
+
+struct art {
+	acpi_handle source;
+	acpi_handle target;
+	u64 weight;
+	u64 ac0_max;
+	u64 ac1_max;
+	u64 ac2_max;
+	u64 ac3_max;
+	u64 ac4_max;
+	u64 ac5_max;
+	u64 ac6_max;
+	u64 ac7_max;
+	u64 ac8_max;
+	u64 ac9_max;
+} __packed;
+
+struct trt {
+	acpi_handle source;
+	acpi_handle target;
+	u64 influence;
+	u64 sample_period;
+	u64 reverved1;
+	u64 reverved2;
+	u64 reverved3;
+	u64 reverved4;
+} __packed;
+
+#define ACPI_NR_ART_ELEMENTS 13
+/* for usrspace */
+union art_object {
+	struct {
+		char source_device[8]; /* ACPI single name */
+		char target_device[8]; /* ACPI single name */
+		u64 weight;
+		u64 ac0_max_level;
+		u64 ac1_max_level;
+		u64 ac2_max_level;
+		u64 ac3_max_level;
+		u64 ac4_max_level;
+		u64 ac5_max_level;
+		u64 ac6_max_level;
+		u64 ac7_max_level;
+		u64 ac8_max_level;
+		u64 ac9_max_level;
+	};
+	u64 __data[ACPI_NR_ART_ELEMENTS];
+};
+
+union trt_object {
+	struct {
+		char source_device[8]; /* ACPI single name */
+		char target_device[8]; /* ACPI single name */
+		u64 influence;
+		u64 sample_period;
+		u64 reserved[4];
+	};
+	u64 __data[8];
+};
+
+#ifdef __KERNEL__
+int acpi_thermal_rel_misc_device_add(acpi_handle handle);
+int acpi_thermal_rel_misc_device_remove(acpi_handle handle);
+int acpi_parse_art(acpi_handle handle, int *art_count, struct art **arts,
+		bool create_dev);
+int acpi_parse_trt(acpi_handle handle, int *trt_count, struct trt **trts,
+		bool create_dev);
+#endif
+
+#endif /* __ACPI_ACPI_THERMAL_H */