Merge branch 'acpi-thermal'

Merge ACPI thermal zone driver updates for 6.8-rc1:

 - Use generic ACPI helpers for evaluating trip point temperature
   objects in the ACPI thermal zone driver (Rafael J. Wysockii, Arnd
   Bergmann).

 - Add Thermal fast Sampling Period (_TFP) support to the ACPI thermal
   zone driver (Jeff Brasen).

* acpi-thermal:
  ACPI: thermal_lib: include "internal.h" for function prototypes
  ACPI: thermal: Add Thermal fast Sampling Period (_TFP) support
  ACPI: thermal: Use library functions to obtain trip point temperature values
  ACPI: thermal_lib: Add functions returning temperature in deci-Kelvin
  thermal: ACPI: Move the ACPI thermal library to drivers/acpi/

5 files changed, 211 insertions, 35 deletions

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index f819e760ff19..6f2bfcf7645c 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -61,6 +61,10 @@ config ACPI_CCA_REQUIRED
 config ACPI_TABLE_LIB
 	bool
 
+config ACPI_THERMAL_LIB
+       depends on THERMAL
+       bool
+
 config ACPI_DEBUGGER
 	bool "AML debugger interface"
 	select ACPI_DEBUG
@@ -327,6 +331,7 @@ config ACPI_THERMAL
 	tristate "Thermal Zone"
 	depends on ACPI_PROCESSOR
 	select THERMAL
+	select ACPI_THERMAL_LIB
 	default y
 	help
 	  This driver supports ACPI thermal zones.  Most mobile and
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index d367e649714f..12ef8180d272 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -89,6 +89,7 @@ obj-$(CONFIG_ACPI_TAD)		+= acpi_tad.o
 obj-$(CONFIG_ACPI_PCI_SLOT)	+= pci_slot.o
 obj-$(CONFIG_ACPI_PROCESSOR)	+= processor.o
 obj-$(CONFIG_ACPI)		+= container.o
+obj-$(CONFIG_ACPI_THERMAL_LIB)	+= thermal_lib.o
 obj-$(CONFIG_ACPI_THERMAL)	+= thermal.o
 obj-$(CONFIG_ACPI_PLATFORM_PROFILE) 	+= platform_profile.o
 obj-$(CONFIG_ACPI_NFIT)		+= nfit/
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 266aad006fe4..6588525c45ef 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -85,6 +85,11 @@ bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent);
 acpi_status acpi_sysfs_table_handler(u32 event, void *table, void *context);
 void acpi_scan_table_notify(void);
 
+int acpi_active_trip_temp(struct acpi_device *adev, int id, int *ret_temp);
+int acpi_passive_trip_temp(struct acpi_device *adev, int *ret_temp);
+int acpi_hot_trip_temp(struct acpi_device *adev, int *ret_temp);
+int acpi_critical_trip_temp(struct acpi_device *adev, int *ret_temp);
+
 #ifdef CONFIG_ARM64
 int acpi_arch_thermal_cpufreq_pctg(void);
 #else
diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 15f09c71a5ec..1208ab0ed45f 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -31,6 +31,8 @@
 #include <linux/uaccess.h>
 #include <linux/units.h>
 
+#include "internal.h"
+
 #define ACPI_THERMAL_CLASS		"thermal_zone"
 #define ACPI_THERMAL_DEVICE_NAME	"Thermal Zone"
 #define ACPI_THERMAL_NOTIFY_TEMPERATURE	0x80
@@ -90,7 +92,7 @@ struct acpi_thermal_passive {
 	struct acpi_thermal_trip trip;
 	unsigned long tc1;
 	unsigned long tc2;
-	unsigned long tsp;
+	unsigned long delay;
 };
 
 struct acpi_thermal_active {
@@ -188,24 +190,19 @@ static int active_trip_index(struct acpi_thermal *tz,
 
 static long get_passive_temp(struct acpi_thermal *tz)
 {
-	unsigned long long tmp;
-	acpi_status status;
+	int temp;
 
-	status = acpi_evaluate_integer(tz->device->handle, "_PSV", NULL, &tmp);
-	if (ACPI_FAILURE(status))
+	if (acpi_passive_trip_temp(tz->device, &temp))
 		return THERMAL_TEMP_INVALID;
 
-	return tmp;
+	return temp;
 }
 
 static long get_active_temp(struct acpi_thermal *tz, int index)
 {
-	char method[] = { '_', 'A', 'C', '0' + index, '\0' };
-	unsigned long long tmp;
-	acpi_status status;
+	int temp;
 
-	status = acpi_evaluate_integer(tz->device->handle, method, NULL, &tmp);
-	if (ACPI_FAILURE(status))
+	if (acpi_active_trip_temp(tz->device, index, &temp))
 		return THERMAL_TEMP_INVALID;
 
 	/*
@@ -215,10 +212,10 @@ static long get_active_temp(struct acpi_thermal *tz, int index)
 	if (act > 0) {
 		unsigned long long override = celsius_to_deci_kelvin(act);
 
-		if (tmp > override)
-			tmp = override;
+		if (temp > override)
+			return override;
 	}
-	return tmp;
+	return temp;
 }
 
 static void acpi_thermal_update_trip(struct acpi_thermal *tz,
@@ -337,13 +334,12 @@ static void acpi_thermal_trips_update(struct acpi_thermal *tz, u32 event)
 					dev_name(&adev->dev), event, 0);
 }
 
-static long acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
+static int acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
 {
-	unsigned long long tmp;
-	acpi_status status;
+	int temp;
 
 	if (crt > 0) {
-		tmp = celsius_to_deci_kelvin(crt);
+		temp = celsius_to_deci_kelvin(crt);
 		goto set;
 	}
 	if (crt == -1) {
@@ -351,38 +347,34 @@ static long acpi_thermal_get_critical_trip(struct acpi_thermal *tz)
 		return THERMAL_TEMP_INVALID;
 	}
 
-	status = acpi_evaluate_integer(tz->device->handle, "_CRT", NULL, &tmp);
-	if (ACPI_FAILURE(status)) {
-		acpi_handle_debug(tz->device->handle, "No critical threshold\n");
+	if (acpi_critical_trip_temp(tz->device, &temp))
 		return THERMAL_TEMP_INVALID;
-	}
-	if (tmp <= 2732) {
+
+	if (temp <= 2732) {
 		/*
 		 * Below zero (Celsius) values clearly aren't right for sure,
 		 * so discard them as invalid.
 		 */
-		pr_info(FW_BUG "Invalid critical threshold (%llu)\n", tmp);
+		pr_info(FW_BUG "Invalid critical threshold (%d)\n", temp);
 		return THERMAL_TEMP_INVALID;
 	}
 
 set:
-	acpi_handle_debug(tz->device->handle, "Critical threshold [%llu]\n", tmp);
-	return tmp;
+	acpi_handle_debug(tz->device->handle, "Critical threshold [%d]\n", temp);
+	return temp;
 }
 
-static long acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
+static int acpi_thermal_get_hot_trip(struct acpi_thermal *tz)
 {
-	unsigned long long tmp;
-	acpi_status status;
+	int temp;
 
-	status = acpi_evaluate_integer(tz->device->handle, "_HOT", NULL, &tmp);
-	if (ACPI_FAILURE(status)) {
+	if (acpi_hot_trip_temp(tz->device, &temp) || temp == THERMAL_TEMP_INVALID) {
 		acpi_handle_debug(tz->device->handle, "No hot threshold\n");
 		return THERMAL_TEMP_INVALID;
 	}
 
-	acpi_handle_debug(tz->device->handle, "Hot threshold [%llu]\n", tmp);
-	return tmp;
+	acpi_handle_debug(tz->device->handle, "Hot threshold [%d]\n", temp);
+	return temp;
 }
 
 static bool passive_trip_params_init(struct acpi_thermal *tz)
@@ -402,11 +394,17 @@ static bool passive_trip_params_init(struct acpi_thermal *tz)
 
 	tz->trips.passive.tc2 = tmp;
 
+	status = acpi_evaluate_integer(tz->device->handle, "_TFP", NULL, &tmp);
+	if (ACPI_SUCCESS(status)) {
+		tz->trips.passive.delay = tmp;
+		return true;
+	}
+
 	status = acpi_evaluate_integer(tz->device->handle, "_TSP", NULL, &tmp);
 	if (ACPI_FAILURE(status))
 		return false;
 
-	tz->trips.passive.tsp = tmp;
+	tz->trips.passive.delay = tmp * 100;
 
 	return true;
 }
@@ -902,7 +900,7 @@ static int acpi_thermal_add(struct acpi_device *device)
 
 	acpi_trip = &tz->trips.passive.trip;
 	if (acpi_thermal_trip_valid(acpi_trip)) {
-		passive_delay = tz->trips.passive.tsp * 100;
+		passive_delay = tz->trips.passive.delay;
 
 		trip->type = THERMAL_TRIP_PASSIVE;
 		trip->temperature = acpi_thermal_temp(tz, acpi_trip->temp_dk);
@@ -1140,6 +1138,7 @@ static void __exit acpi_thermal_exit(void)
 module_init(acpi_thermal_init);
 module_exit(acpi_thermal_exit);
 
+MODULE_IMPORT_NS(ACPI_THERMAL);
 MODULE_AUTHOR("Paul Diefenbaugh");
 MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
 MODULE_LICENSE("GPL");
diff --git a/drivers/acpi/thermal_lib.c b/drivers/acpi/thermal_lib.c
new file mode 100644
index 000000000000..4e0519ca9739
--- /dev/null
+++ b/drivers/acpi/thermal_lib.c
@@ -0,0 +1,166 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2023 Linaro Limited
+ * Copyright 2023 Intel Corporation
+ *
+ * Library routines for retrieving trip point temperature values from the
+ * platform firmware via ACPI.
+ */
+#include <linux/acpi.h>
+#include <linux/units.h>
+#include <linux/thermal.h>
+#include "internal.h"
+
+/*
+ * Minimum temperature for full military grade is 218°K (-55°C) and
+ * max temperature is 448°K (175°C). We can consider those values as
+ * the boundaries for the [trips] temperature returned by the
+ * firmware. Any values out of these boundaries may be considered
+ * bogus and we can assume the firmware has no data to provide.
+ */
+#define TEMP_MIN_DECIK	2180ULL
+#define TEMP_MAX_DECIK	4480ULL
+
+static int acpi_trip_temp(struct acpi_device *adev, char *obj_name,
+			  int *ret_temp)
+{
+	unsigned long long temp;
+	acpi_status status;
+
+	status = acpi_evaluate_integer(adev->handle, obj_name, NULL, &temp);
+	if (ACPI_FAILURE(status)) {
+		acpi_handle_debug(adev->handle, "%s evaluation failed\n", obj_name);
+		return -ENODATA;
+	}
+
+	if (temp >= TEMP_MIN_DECIK && temp <= TEMP_MAX_DECIK) {
+		*ret_temp = temp;
+	} else {
+		acpi_handle_debug(adev->handle, "%s result %llu out of range\n",
+				  obj_name, temp);
+		*ret_temp = THERMAL_TEMP_INVALID;
+	}
+
+	return 0;
+}
+
+int acpi_active_trip_temp(struct acpi_device *adev, int id, int *ret_temp)
+{
+	char obj_name[] = {'_', 'A', 'C', '0' + id, '\0'};
+
+	if (id < 0 || id > 9)
+		return -EINVAL;
+
+	return acpi_trip_temp(adev, obj_name, ret_temp);
+}
+EXPORT_SYMBOL_NS_GPL(acpi_active_trip_temp, ACPI_THERMAL);
+
+int acpi_passive_trip_temp(struct acpi_device *adev, int *ret_temp)
+{
+	return acpi_trip_temp(adev, "_PSV", ret_temp);
+}
+EXPORT_SYMBOL_NS_GPL(acpi_passive_trip_temp, ACPI_THERMAL);
+
+int acpi_hot_trip_temp(struct acpi_device *adev, int *ret_temp)
+{
+	return acpi_trip_temp(adev, "_HOT", ret_temp);
+}
+EXPORT_SYMBOL_NS_GPL(acpi_hot_trip_temp, ACPI_THERMAL);
+
+int acpi_critical_trip_temp(struct acpi_device *adev, int *ret_temp)
+{
+	return acpi_trip_temp(adev, "_CRT", ret_temp);
+}
+EXPORT_SYMBOL_NS_GPL(acpi_critical_trip_temp, ACPI_THERMAL);
+
+static int thermal_temp(int error, int temp_decik, int *ret_temp)
+{
+	if (error)
+		return error;
+
+	if (temp_decik == THERMAL_TEMP_INVALID)
+		*ret_temp = THERMAL_TEMP_INVALID;
+	else
+		*ret_temp = deci_kelvin_to_millicelsius(temp_decik);
+
+	return 0;
+}
+
+/**
+ * thermal_acpi_active_trip_temp - Retrieve active trip point temperature
+ * @adev: Target thermal zone ACPI device object.
+ * @id: Active cooling level (0 - 9).
+ * @ret_temp: Address to store the retrieved temperature value on success.
+ *
+ * Evaluate the _ACx object for the thermal zone represented by @adev to obtain
+ * the temperature of the active cooling trip point corresponding to the active
+ * cooling level given by @id.
+ *
+ * Return 0 on success or a negative error value on failure.
+ */
+int thermal_acpi_active_trip_temp(struct acpi_device *adev, int id, int *ret_temp)
+{
+	int temp_decik;
+	int ret = acpi_active_trip_temp(adev, id, &temp_decik);
+
+	return thermal_temp(ret, temp_decik, ret_temp);
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_active_trip_temp);
+
+/**
+ * thermal_acpi_passive_trip_temp - Retrieve passive trip point temperature
+ * @adev: Target thermal zone ACPI device object.
+ * @ret_temp: Address to store the retrieved temperature value on success.
+ *
+ * Evaluate the _PSV object for the thermal zone represented by @adev to obtain
+ * the temperature of the passive cooling trip point.
+ *
+ * Return 0 on success or -ENODATA on failure.
+ */
+int thermal_acpi_passive_trip_temp(struct acpi_device *adev, int *ret_temp)
+{
+	int temp_decik;
+	int ret = acpi_passive_trip_temp(adev, &temp_decik);
+
+	return thermal_temp(ret, temp_decik, ret_temp);
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_passive_trip_temp);
+
+/**
+ * thermal_acpi_hot_trip_temp - Retrieve hot trip point temperature
+ * @adev: Target thermal zone ACPI device object.
+ * @ret_temp: Address to store the retrieved temperature value on success.
+ *
+ * Evaluate the _HOT object for the thermal zone represented by @adev to obtain
+ * the temperature of the trip point at which the system is expected to be put
+ * into the S4 sleep state.
+ *
+ * Return 0 on success or -ENODATA on failure.
+ */
+int thermal_acpi_hot_trip_temp(struct acpi_device *adev, int *ret_temp)
+{
+	int temp_decik;
+	int ret = acpi_hot_trip_temp(adev, &temp_decik);
+
+	return thermal_temp(ret, temp_decik, ret_temp);
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_hot_trip_temp);
+
+/**
+ * thermal_acpi_critical_trip_temp - Retrieve critical trip point temperature
+ * @adev: Target thermal zone ACPI device object.
+ * @ret_temp: Address to store the retrieved temperature value on success.
+ *
+ * Evaluate the _CRT object for the thermal zone represented by @adev to obtain
+ * the temperature of the critical cooling trip point.
+ *
+ * Return 0 on success or -ENODATA on failure.
+ */
+int thermal_acpi_critical_trip_temp(struct acpi_device *adev, int *ret_temp)
+{
+	int temp_decik;
+	int ret = acpi_critical_trip_temp(adev, &temp_decik);
+
+	return thermal_temp(ret, temp_decik, ret_temp);
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_critical_trip_temp);