[PATCH v6 0/3] Thermal ACPI APIs for generic trip points

[PATCH v6 0/3] Thermal ACPI APIs for generic trip points

[Daniel Lezcano]

Recently sent as a RFC, the thermal ACPI for generic trip points is a set of
functions to fill the generic trip points structure which will become the
standard structure for the thermal framework and its users.

Different Intel drivers and the ACPI thermal driver are using the ACPI tables to
get the thermal zone information. As those are getting the same information,
providing this set of ACPI function with the generic trip points will
consolidate the code.

Also, the Intel PCH and the Intel 34xx drivers are converted to use the generic
trip points relying on the ACPI generic trip point parsing functions.

These changes have been tested on a Thinkpad Lenovo x280 with the PCH and
INT34xx drivers. No regression have been observed, the trip points remain the
same for what is described on this system.

Changelog:
 - V6:
   - Changed thermal ACPI function names according the changes done in the first patch
   - Put back the GTSH function here as it is specific to int340x
   - Propagate the function name change from thermal ACPI
   - Changed the functions name and prototype to return the temperature
     instead of passing a pointer
   - Removed the GTSH function as it does not belong to the ACPI standard
   - Changed hysteresis -> hyst, temperature -> temp
   - Changed message level info -> debug
   - Changed error messages
   - Return -ENODATA error only
   - Fixed description functions
 
 - V5:
   - Fixed GTSH unit conversion, deciK -> milli C

 - V4:
   - Fixed Kconfig option dependency, select THERMAL_ACPI if ACPI is set
     only for the PCH driver

 - V3:
   - Took into account Rafael's comments
   - Used a silence option THERMAL_ACPI in order to stay consistent
     with THERMAL_OF. It is up to the API user to select the option.

 - V2:
   - Fix the thermal ACPI patch where the thermal_acpi.c was not included in
     the series
   - Provide a couple of users of this API which could have been tested on a
     real system

Daniel Lezcano (3):
  thermal/acpi: Add ACPI trip point routines
  thermal/drivers/intel: Use generic trip points for intel_pch
  thermal/drivers/intel: Use generic trip points int340x

 drivers/thermal/Kconfig                       |   4 +
 drivers/thermal/Makefile                      |   1 +
 drivers/thermal/intel/Kconfig                 |   1 +
 drivers/thermal/intel/int340x_thermal/Kconfig |   1 +
 .../int340x_thermal/int340x_thermal_zone.c    | 168 ++++------------
 .../int340x_thermal/int340x_thermal_zone.h    |  10 +-
 drivers/thermal/intel/intel_pch_thermal.c     |  88 ++-------
 drivers/thermal/thermal_acpi.c                | 185 ++++++++++++++++++
 include/linux/thermal.h                       |   7 +
 9 files changed, 263 insertions(+), 202 deletions(-)
 create mode 100644 drivers/thermal/thermal_acpi.c

-- 
2.34.1

[PATCH v6 1/3] thermal/acpi: Add ACPI trip point routines

[Daniel Lezcano]

The ACPI specification describes the trip points, the device tree
bindings as well.

The OF code uses the generic trip point structures.

The ACPI has their own trip points structure and uses the get_trip_*
ops to retrieve them.

We can do the same as the OF code and create a set of ACPI functions
to retrieve a trip point description. Having a common code for ACPI
will help to cleanup the remaining Intel drivers and get rid of the
get_trip_* functions.

These changes add the ACPI thermal calls to retrieve the basic
information we need to be reused in the thermal ACPI and Intel
drivers.

The different ACPI functions have the generic trip point structure
passed as parameter where it is filled.

This structure aims to be the one used by all the thermal drivers and
the thermal framework.

After this series, a couple of Intel drivers and the ACPI thermal
driver will still have their own trip points definition but a new
series on top of this one will finish the conversion to the generic
trip point handling.

This series depends on the generic trip point added to the thermal
framework and available in the thermal/linux-next branch.

 https://lkml.org/lkml/2022/10/3/456

It has been tested on a Intel i7-8650U - x280 with the INT3400, the
PCH, ACPITZ, and x86_pkg_temp. No regression observed so far.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: srinivas pandruvada <srinivas.pandruvada@linux.intel.com>
---
 V6:
   - Changed the functions name and prototype to return the temperature
     instead of passing a pointer
   - Removed the GTSH function as it does not belong to the ACPI standard
   - Changed hysteresis -> hyst, temperature -> temp
   - Changed message level info -> debug
   - Changed error messages
   - Return -ENODATA error only
   - Fixed description functions

 V5:
   - Fixed GTSH unit conversion, deciK -> milli C

 V3:
   - Removed too simple wrappers
   - Changed the API to return an error and check the validity of the value
   - Removed the comments describing the objects
   - Added kerneldoc
   - Made the Kconfig option silent
   - Set the hysteresis value to zero by default

 V2:
   - Fixed the missing thermal_acpi.c in the patch

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/thermal/Kconfig        |   4 +
 drivers/thermal/Makefile       |   1 +
 drivers/thermal/thermal_acpi.c | 185 +++++++++++++++++++++++++++++++++
 include/linux/thermal.h        |   7 ++
 4 files changed, 197 insertions(+)
 create mode 100644 drivers/thermal/thermal_acpi.c

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
index e052dae614eb..eaeb2b2ee6e9 100644
--- a/drivers/thermal/Kconfig
+++ b/drivers/thermal/Kconfig
@@ -76,6 +76,10 @@ config THERMAL_OF
 	  Say 'Y' here if you need to build thermal infrastructure
 	  based on device tree.
 
+config THERMAL_ACPI
+       depends on ACPI
+       bool
+
 config THERMAL_WRITABLE_TRIPS
 	bool "Enable writable trip points"
 	help
diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
index 2506c6c8ca83..60f0dfa9aae2 100644
--- a/drivers/thermal/Makefile
+++ b/drivers/thermal/Makefile
@@ -13,6 +13,7 @@ thermal_sys-$(CONFIG_THERMAL_NETLINK)		+= thermal_netlink.o
 # interface to/from other layers providing sensors
 thermal_sys-$(CONFIG_THERMAL_HWMON)		+= thermal_hwmon.o
 thermal_sys-$(CONFIG_THERMAL_OF)		+= thermal_of.o
+thermal_sys-$(CONFIG_THERMAL_ACPI)		+= thermal_acpi.o
 
 # governors
 thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE)	+= gov_fair_share.o
diff --git a/drivers/thermal/thermal_acpi.c b/drivers/thermal/thermal_acpi.c
new file mode 100644
index 000000000000..c72fca44bc86
--- /dev/null
+++ b/drivers/thermal/thermal_acpi.c
@@ -0,0 +1,185 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2022 Linaro Limited
+ *
+ * Author: Daniel Lezcano <daniel.lezcano@linaro.org>
+ *
+ * ACPI thermal configuration
+ */
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/units.h>
+#include <uapi/linux/thermal.h>
+
+#include "thermal_core.h"
+
+/*
+ * An hysteresis value below zero is invalid and we can consider a
+ * value greater than 20°K/°C is invalid too.
+ */
+#define HYST_MIN_DECIK	0
+#define HYST_MAX_DECIK	200
+
+/*
+ * 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	2180
+#define TEMP_MAX_DECIK	4480
+
+static int thermal_acpi_get_temp(struct acpi_device *adev, char *object_name)
+{
+	unsigned long long temp;
+	acpi_status status;
+
+	status = acpi_evaluate_integer(adev->handle, object_name, NULL, &temp);
+	if (ACPI_FAILURE(status)) {
+		acpi_handle_debug(adev->handle, "Failed to get temperature object '%s'\n", object_name);
+		return -ENODATA;
+	}
+
+	if (temp < TEMP_MIN_DECIK || temp >= TEMP_MAX_DECIK) {
+		acpi_handle_debug(adev->handle, "Invalid value '%llu' returned by '%s'\n", temp, object_name);
+		return -ENODATA;
+	}
+
+	return (int)temp;
+}
+
+/**
+ * thermal_acpi_active_trip_temp() - Get the specified active trip point
+ * @adev: Thermal zone ACPI device object to get the description from
+ * @trip: Trip point structure to be populated on success
+ * @id: Active cooling level (0 - 9)
+ *
+ * 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 and
+ * initialize @trip as an active trip point using that temperature
+ * value.
+ *
+ * Return: 
+ * * 0 - Success
+ * * -ENODATA - Failed to get the ACPI object, or the value appears to be inconsistent
+ */
+int thermal_acpi_active_trip_temp(struct acpi_device *adev,
+				  struct thermal_trip *trip, int id)
+{
+	char name[] = "_AC0";
+	int temp;
+
+	if (id < 0 || id > 9)
+		return -EINVAL;
+
+	name[3] += id;
+	
+	temp = thermal_acpi_get_temp(adev, name);
+	if (temp < 0)
+		return temp;
+
+	trip->temperature = deci_kelvin_to_millicelsius(temp);
+	trip->hysteresis = 0;
+	trip->type = THERMAL_TRIP_ACTIVE;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_active_trip_temp);
+
+/**
+ * thermal_acpi_passive_trip_temp() - Get the passive trip point
+ * @adev: Thermal zone ACPI device object to get the description from
+ * @trip: Trip point structure to be populated on success
+ *
+ * Evaluate the _PSV object for the thermal zone represented by @adev
+ * to obtain the temperature of the passive cooling trip point and
+ * initialize @trip as a passive trip point using that temperature
+ * value.
+ *
+ * Return:
+ * * 0 - Success
+ * * -ENODATA - Failed to get the ACPI object, or the value appears to be inconsistent
+ */
+int thermal_acpi_passive_trip_temp(struct acpi_device *adev, struct thermal_trip *trip)
+{
+	int temp;
+
+	temp = thermal_acpi_get_temp(adev, "_PSV");
+	if (temp < 0)
+		return temp;
+
+	trip->temperature = deci_kelvin_to_millicelsius(temp);
+	trip->hysteresis = 0;
+	trip->type = THERMAL_TRIP_PASSIVE;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_passive_trip_temp);
+
+/**
+ * thermal_acpi_hot_trip_temp() - Get the near critical trip point
+ * @adev: the ACPI device to get the description from
+ * @trip: a &struct thermal_trip to be filled if the function succeed
+ *
+ * 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 and initialize @trip as
+ * a hot trip point using that temperature value.
+ *
+ * Return:
+ * * 0 - Success
+ * * -ENODATA - Failed to get the ACPI object, or the value appears to be inconsistent
+ */
+int thermal_acpi_hot_trip_temp(struct acpi_device *adev, struct thermal_trip *trip)
+{
+	int temp;
+
+	temp = thermal_acpi_get_temp(adev, "_HOT");
+	if (temp < 0)
+		return temp;
+
+	trip->temperature = deci_kelvin_to_millicelsius(temp);
+	trip->hysteresis = 0;
+	trip->type = THERMAL_TRIP_HOT;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_hot_trip_temp);
+
+/**
+ * thermal_acpi_critical_trip_temp() - Get the critical trip point
+ * @adev: the ACPI device to get the description from
+ * @trip: a &struct thermal_trip to be filled if the function succeed
+ *
+ * Evaluate the _CRT object for the thermal zone represented by @adev
+ * to obtain the temperature of the critical cooling trip point and
+ * initialize @trip as a critical trip point using that temperature
+ * value.
+ *
+ * Return:
+ * * 0 - Success
+ * * -ENODATA - Failed to get the ACPI object, or the value appears to be inconsistent
+ */
+int thermal_acpi_critical_trip_temp(struct acpi_device *adev, struct thermal_trip *trip)
+{
+	int temp;
+
+	temp = thermal_acpi_get_temp(adev, "_CRT");
+	if (temp < 0)
+		return temp;
+
+	/*
+	 * The hysteresis value has no sense here because critical
+	 * trip point has no u-turn
+	 */
+	trip->temperature = deci_kelvin_to_millicelsius(temp);
+	trip->hysteresis = 0;
+	trip->type = THERMAL_TRIP_CRITICAL;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_critical_trip_temp);
+
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 30353e4b1424..2aee1f0d5fac 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -334,6 +334,13 @@ static inline void devm_thermal_of_zone_unregister(struct device *dev,
 }
 #endif
 
+#ifdef CONFIG_THERMAL_ACPI
+int thermal_acpi_critical_trip_temp(struct acpi_device *adev, struct thermal_trip *trip);
+int thermal_acpi_hot_trip_temp(struct acpi_device *adev, struct thermal_trip *trip);
+int thermal_acpi_passive_trip_temp(struct acpi_device *adev, struct thermal_trip *trip);
+int thermal_acpi_active_trip_temp(struct acpi_device *adev, struct thermal_trip *trip, int id);
+#endif
+
 int __thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
 			    struct thermal_trip *trip);
 int thermal_zone_get_trip(struct thermal_zone_device *tz, int trip_id,
-- 
2.34.1

[PATCH v6 2/3] thermal/drivers/intel: Use generic trip points for intel_pch

[Daniel Lezcano]

The thermal framework gives the possibility to register the trip
points with the thermal zone. When that is done, no get_trip_* ops are
needed and they can be removed.

Convert the ops content logic into generic trip points and register
them with the thermal zone.

In order to consolidate the code, use the ACPI thermal framework API
to fill the generic trip point from the ACPI tables.

It has been tested on a Intel i7-8650U - x280 with the INT3400, the
PCH, ACPITZ, and x86_pkg_temp. No regression observed so far.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: srinivas pandruvada <srinivas.pandruvada@linux.intel.com>
---
   V6:
     - Propagate the function name change from thermal ACPI

   V4:
     - Changed select THERMAL_ACPI if ACPI in order to prevent
      dependency inconsistency

   V3:
     - The driver Kconfig option selects CONFIG_THERMAL_ACPI

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/thermal/intel/Kconfig             |  1 +
 drivers/thermal/intel/intel_pch_thermal.c | 88 +++++------------------
 2 files changed, 20 insertions(+), 69 deletions(-)

diff --git a/drivers/thermal/intel/Kconfig b/drivers/thermal/intel/Kconfig
index f0c845679250..7d68c076c23d 100644
--- a/drivers/thermal/intel/Kconfig
+++ b/drivers/thermal/intel/Kconfig
@@ -75,6 +75,7 @@ config INTEL_BXT_PMIC_THERMAL
 config INTEL_PCH_THERMAL
 	tristate "Intel PCH Thermal Reporting Driver"
 	depends on X86 && PCI
+	select THERMAL_ACPI if ACPI
 	help
 	  Enable this to support thermal reporting on certain intel PCHs.
 	  Thermal reporting device will provide temperature reading,
diff --git a/drivers/thermal/intel/intel_pch_thermal.c b/drivers/thermal/intel/intel_pch_thermal.c
index dabf11a687a1..5f1568270fc7 100644
--- a/drivers/thermal/intel/intel_pch_thermal.c
+++ b/drivers/thermal/intel/intel_pch_thermal.c
@@ -65,6 +65,8 @@
 #define WPT_TEMP_OFFSET	(PCH_TEMP_OFFSET * MILLIDEGREE_PER_DEGREE)
 #define GET_PCH_TEMP(x)	(((x) / 2) + PCH_TEMP_OFFSET)
 
+#define PCH_MAX_TRIPS 3 /* critical, hot, passive */
+
 /* Amount of time for each cooling delay, 100ms by default for now */
 static unsigned int delay_timeout = 100;
 module_param(delay_timeout, int, 0644);
@@ -82,12 +84,7 @@ struct pch_thermal_device {
 	const struct pch_dev_ops *ops;
 	struct pci_dev *pdev;
 	struct thermal_zone_device *tzd;
-	int crt_trip_id;
-	unsigned long crt_temp;
-	int hot_trip_id;
-	unsigned long hot_temp;
-	int psv_trip_id;
-	unsigned long psv_temp;
+	struct thermal_trip trips[PCH_MAX_TRIPS];
 	bool bios_enabled;
 };
 
@@ -102,33 +99,22 @@ static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
 				      int *nr_trips)
 {
 	struct acpi_device *adev;
-
-	ptd->psv_trip_id = -1;
+	int ret;
 
 	adev = ACPI_COMPANION(&ptd->pdev->dev);
-	if (adev) {
-		unsigned long long r;
-		acpi_status status;
-
-		status = acpi_evaluate_integer(adev->handle, "_PSV", NULL,
-					       &r);
-		if (ACPI_SUCCESS(status)) {
-			unsigned long trip_temp;
-
-			trip_temp = deci_kelvin_to_millicelsius(r);
-			if (trip_temp) {
-				ptd->psv_temp = trip_temp;
-				ptd->psv_trip_id = *nr_trips;
-				++(*nr_trips);
-			}
-		}
-	}
+	if (!adev)
+		return;
+
+	ret = thermal_acpi_passive_trip_temp(adev, &ptd->trips[*nr_trips]);
+	if (ret)
+		return;
+
+	++(*nr_trips);
 }
 #else
 static void pch_wpt_add_acpi_psv_trip(struct pch_thermal_device *ptd,
 				      int *nr_trips)
 {
-	ptd->psv_trip_id = -1;
 
 }
 #endif
@@ -163,21 +149,19 @@ static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
 	}
 
 read_trips:
-	ptd->crt_trip_id = -1;
 	trip_temp = readw(ptd->hw_base + WPT_CTT);
 	trip_temp &= 0x1FF;
 	if (trip_temp) {
-		ptd->crt_temp = GET_WPT_TEMP(trip_temp);
-		ptd->crt_trip_id = 0;
+		ptd->trips[*nr_trips].temperature = GET_WPT_TEMP(trip_temp);
+		ptd->trips[*nr_trips].type = THERMAL_TRIP_CRITICAL;
 		++(*nr_trips);
 	}
 
-	ptd->hot_trip_id = -1;
 	trip_temp = readw(ptd->hw_base + WPT_PHL);
 	trip_temp &= 0x1FF;
 	if (trip_temp) {
-		ptd->hot_temp = GET_WPT_TEMP(trip_temp);
-		ptd->hot_trip_id = *nr_trips;
+		ptd->trips[*nr_trips].temperature = GET_WPT_TEMP(trip_temp);
+		ptd->trips[*nr_trips].type = THERMAL_TRIP_HOT;
 		++(*nr_trips);
 	}
 
@@ -298,39 +282,6 @@ static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
 	return	ptd->ops->get_temp(ptd, temp);
 }
 
-static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
-			     enum thermal_trip_type *type)
-{
-	struct pch_thermal_device *ptd = tzd->devdata;
-
-	if (ptd->crt_trip_id == trip)
-		*type = THERMAL_TRIP_CRITICAL;
-	else if (ptd->hot_trip_id == trip)
-		*type = THERMAL_TRIP_HOT;
-	else if (ptd->psv_trip_id == trip)
-		*type = THERMAL_TRIP_PASSIVE;
-	else
-		return -EINVAL;
-
-	return 0;
-}
-
-static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp)
-{
-	struct pch_thermal_device *ptd = tzd->devdata;
-
-	if (ptd->crt_trip_id == trip)
-		*temp = ptd->crt_temp;
-	else if (ptd->hot_trip_id == trip)
-		*temp = ptd->hot_temp;
-	else if (ptd->psv_trip_id == trip)
-		*temp = ptd->psv_temp;
-	else
-		return -EINVAL;
-
-	return 0;
-}
-
 static void pch_critical(struct thermal_zone_device *tzd)
 {
 	dev_dbg(&tzd->device, "%s: critical temperature reached\n", tzd->type);
@@ -338,8 +289,6 @@ static void pch_critical(struct thermal_zone_device *tzd)
 
 static struct thermal_zone_device_ops tzd_ops = {
 	.get_temp = pch_thermal_get_temp,
-	.get_trip_type = pch_get_trip_type,
-	.get_trip_temp = pch_get_trip_temp,
 	.critical = pch_critical,
 };
 
@@ -423,8 +372,9 @@ static int intel_pch_thermal_probe(struct pci_dev *pdev,
 	if (err)
 		goto error_cleanup;
 
-	ptd->tzd = thermal_zone_device_register(bi->name, nr_trips, 0, ptd,
-						&tzd_ops, NULL, 0, 0);
+	ptd->tzd = thermal_zone_device_register_with_trips(bi->name, ptd->trips,
+							   nr_trips, 0, ptd,
+							   &tzd_ops, NULL, 0, 0);
 	if (IS_ERR(ptd->tzd)) {
 		dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
 			bi->name);
-- 
2.34.1

[PATCH v6 3/3] thermal/drivers/intel: Use generic trip points int340x

[Daniel Lezcano]

The thermal framework gives the possibility to register the trip
points with the thermal zone. When that is done, no get_trip_* ops are
needed and they can be removed.

Convert the ops content logic into generic trip points and register
them with the thermal zone.

In order to consolidate the code, use the ACPI thermal framework API
to fill the generic trip point from the ACPI tables.

It has been tested on a Intel i7-8650U - x280 with the INT3400, the
PCH, ACPITZ, and x86_pkg_temp. No regression observed so far.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Zhang Rui <rui.zhang@intel.com>
Tested-by: srinivas pandruvada <srinivas.pandruvada@linux.intel.com>
---
   V6:
      - Changed thermal ACPI function names according the changes done in the first patch
      - Put back the GTSH function here as it is specific to int340x

   V3:
      - The driver Kconfig option selects CONFIG_THERMAL_ACPI
      - Change the initialization to use GTSH for the hysteresis on
        all the trip points

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/thermal/intel/int340x_thermal/Kconfig |   1 +
 .../int340x_thermal/int340x_thermal_zone.c    | 168 +++++-------------
 .../int340x_thermal/int340x_thermal_zone.h    |  10 +-
 3 files changed, 46 insertions(+), 133 deletions(-)

diff --git a/drivers/thermal/intel/int340x_thermal/Kconfig b/drivers/thermal/intel/int340x_thermal/Kconfig
index 5d046de96a5d..b7072d37101d 100644
--- a/drivers/thermal/intel/int340x_thermal/Kconfig
+++ b/drivers/thermal/intel/int340x_thermal/Kconfig
@@ -9,6 +9,7 @@ config INT340X_THERMAL
 	select THERMAL_GOV_USER_SPACE
 	select ACPI_THERMAL_REL
 	select ACPI_FAN
+	select THERMAL_ACPI
 	select INTEL_SOC_DTS_IOSF_CORE
 	select PROC_THERMAL_MMIO_RAPL if POWERCAP
 	help
diff --git a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
index 228f44260b27..c0cd1d4283d6 100644
--- a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
+++ b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.c
@@ -37,65 +37,6 @@ static int int340x_thermal_get_zone_temp(struct thermal_zone_device *zone,
 	return 0;
 }
 
-static int int340x_thermal_get_trip_temp(struct thermal_zone_device *zone,
-					 int trip, int *temp)
-{
-	struct int34x_thermal_zone *d = zone->devdata;
-	int i;
-
-	if (trip < d->aux_trip_nr)
-		*temp = d->aux_trips[trip];
-	else if (trip == d->crt_trip_id)
-		*temp = d->crt_temp;
-	else if (trip == d->psv_trip_id)
-		*temp = d->psv_temp;
-	else if (trip == d->hot_trip_id)
-		*temp = d->hot_temp;
-	else {
-		for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) {
-			if (d->act_trips[i].valid &&
-			    d->act_trips[i].id == trip) {
-				*temp = d->act_trips[i].temp;
-				break;
-			}
-		}
-		if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
-			return -EINVAL;
-	}
-
-	return 0;
-}
-
-static int int340x_thermal_get_trip_type(struct thermal_zone_device *zone,
-					 int trip,
-					 enum thermal_trip_type *type)
-{
-	struct int34x_thermal_zone *d = zone->devdata;
-	int i;
-
-	if (trip < d->aux_trip_nr)
-		*type = THERMAL_TRIP_PASSIVE;
-	else if (trip == d->crt_trip_id)
-		*type = THERMAL_TRIP_CRITICAL;
-	else if (trip == d->hot_trip_id)
-		*type = THERMAL_TRIP_HOT;
-	else if (trip == d->psv_trip_id)
-		*type = THERMAL_TRIP_PASSIVE;
-	else {
-		for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) {
-			if (d->act_trips[i].valid &&
-			    d->act_trips[i].id == trip) {
-				*type = THERMAL_TRIP_ACTIVE;
-				break;
-			}
-		}
-		if (i == INT340X_THERMAL_MAX_ACT_TRIP_COUNT)
-			return -EINVAL;
-	}
-
-	return 0;
-}
-
 static int int340x_thermal_set_trip_temp(struct thermal_zone_device *zone,
 				      int trip, int temp)
 {
@@ -109,20 +50,15 @@ static int int340x_thermal_set_trip_temp(struct thermal_zone_device *zone,
 	if (ACPI_FAILURE(status))
 		return -EIO;
 
-	d->aux_trips[trip] = temp;
-
 	return 0;
 }
 
-
-static int int340x_thermal_get_trip_hyst(struct thermal_zone_device *zone,
-		int trip, int *temp)
+static int int340x_thermal_get_global_hyst(struct acpi_device *adev, int *temp)
 {
-	struct int34x_thermal_zone *d = zone->devdata;
 	acpi_status status;
 	unsigned long long hyst;
 
-	status = acpi_evaluate_integer(d->adev->handle, "GTSH", NULL, &hyst);
+	status = acpi_evaluate_integer(adev->handle, "GTSH", NULL, &hyst);
 	if (ACPI_FAILURE(status))
 		*temp = 0;
 	else
@@ -131,6 +67,7 @@ static int int340x_thermal_get_trip_hyst(struct thermal_zone_device *zone,
 	return 0;
 }
 
+
 static void int340x_thermal_critical(struct thermal_zone_device *zone)
 {
 	dev_dbg(&zone->device, "%s: critical temperature reached\n", zone->type);
@@ -138,58 +75,36 @@ static void int340x_thermal_critical(struct thermal_zone_device *zone)
 
 static struct thermal_zone_device_ops int340x_thermal_zone_ops = {
 	.get_temp       = int340x_thermal_get_zone_temp,
-	.get_trip_temp	= int340x_thermal_get_trip_temp,
-	.get_trip_type	= int340x_thermal_get_trip_type,
 	.set_trip_temp	= int340x_thermal_set_trip_temp,
-	.get_trip_hyst =  int340x_thermal_get_trip_hyst,
 	.critical	= int340x_thermal_critical,
 };
 
-static int int340x_thermal_get_trip_config(acpi_handle handle, char *name,
-				      int *temp)
-{
-	unsigned long long r;
-	acpi_status status;
-
-	status = acpi_evaluate_integer(handle, name, NULL, &r);
-	if (ACPI_FAILURE(status))
-		return -EIO;
-
-	*temp = deci_kelvin_to_millicelsius(r);
-
-	return 0;
-}
-
 int int340x_thermal_read_trips(struct int34x_thermal_zone *int34x_zone)
 {
-	int trip_cnt = int34x_zone->aux_trip_nr;
-	int i;
+	int trip_cnt;
+	int i, ret;
 
-	int34x_zone->crt_trip_id = -1;
-	if (!int340x_thermal_get_trip_config(int34x_zone->adev->handle, "_CRT",
-					     &int34x_zone->crt_temp))
-		int34x_zone->crt_trip_id = trip_cnt++;
+	trip_cnt = int34x_zone->aux_trip_nr;
 
-	int34x_zone->hot_trip_id = -1;
-	if (!int340x_thermal_get_trip_config(int34x_zone->adev->handle, "_HOT",
-					     &int34x_zone->hot_temp))
-		int34x_zone->hot_trip_id = trip_cnt++;
+	ret = thermal_acpi_critical_trip_temp(int34x_zone->adev, &int34x_zone->trips[trip_cnt]);
+	if (!ret)
+		trip_cnt++;
 
-	int34x_zone->psv_trip_id = -1;
-	if (!int340x_thermal_get_trip_config(int34x_zone->adev->handle, "_PSV",
-					     &int34x_zone->psv_temp))
-		int34x_zone->psv_trip_id = trip_cnt++;
+	ret = thermal_acpi_hot_trip_temp(int34x_zone->adev, &int34x_zone->trips[trip_cnt]);
+	if (!ret)
+		trip_cnt++;
+
+	ret = thermal_acpi_passive_trip_temp(int34x_zone->adev, &int34x_zone->trips[trip_cnt]);
+	if (!ret)
+		trip_cnt++;
 
 	for (i = 0; i < INT340X_THERMAL_MAX_ACT_TRIP_COUNT; i++) {
-		char name[5] = { '_', 'A', 'C', '0' + i, '\0' };
 
-		if (int340x_thermal_get_trip_config(int34x_zone->adev->handle,
-					name,
-					&int34x_zone->act_trips[i].temp))
+		ret = thermal_acpi_active_trip_temp(int34x_zone->adev, &int34x_zone->trips[trip_cnt], i);
+		if (ret)
 			break;
 
-		int34x_zone->act_trips[i].id = trip_cnt++;
-		int34x_zone->act_trips[i].valid = true;
+		trip_cnt++;
 	}
 
 	return trip_cnt;
@@ -208,7 +123,7 @@ struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
 	acpi_status status;
 	unsigned long long trip_cnt;
 	int trip_mask = 0;
-	int ret;
+	int i, ret;
 
 	int34x_thermal_zone = kzalloc(sizeof(*int34x_thermal_zone),
 				      GFP_KERNEL);
@@ -228,32 +143,35 @@ struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
 		int34x_thermal_zone->ops->get_temp = get_temp;
 
 	status = acpi_evaluate_integer(adev->handle, "PATC", NULL, &trip_cnt);
-	if (ACPI_FAILURE(status))
-		trip_cnt = 0;
-	else {
-		int i;
-
-		int34x_thermal_zone->aux_trips =
-			kcalloc(trip_cnt,
-				sizeof(*int34x_thermal_zone->aux_trips),
-				GFP_KERNEL);
-		if (!int34x_thermal_zone->aux_trips) {
-			ret = -ENOMEM;
-			goto err_trip_alloc;
-		}
-		trip_mask = BIT(trip_cnt) - 1;
+	if (!ACPI_FAILURE(status)) {
 		int34x_thermal_zone->aux_trip_nr = trip_cnt;
-		for (i = 0; i < trip_cnt; ++i)
-			int34x_thermal_zone->aux_trips[i] = THERMAL_TEMP_INVALID;
+		trip_mask = BIT(trip_cnt) - 1;
+	}
+
+	int34x_thermal_zone->trips = kzalloc(sizeof(*int34x_thermal_zone->trips) *
+					     (INT340X_THERMAL_MAX_TRIP_COUNT + trip_cnt),
+					      GFP_KERNEL);
+	if (!int34x_thermal_zone->trips) {
+		ret = -ENOMEM;
+		goto err_trips_alloc;
 	}
 
 	trip_cnt = int340x_thermal_read_trips(int34x_thermal_zone);
 
+	for (i = 0; i < trip_cnt; ++i)
+		int340x_thermal_get_global_hyst(adev, &int34x_thermal_zone->trips[i].hysteresis);
+
+	for (i = 0; i < int34x_thermal_zone->aux_trip_nr; i++) {
+		int34x_thermal_zone->trips[i].type = THERMAL_TRIP_PASSIVE;
+		int34x_thermal_zone->trips[i].temperature = THERMAL_TEMP_INVALID;
+	}
+	
 	int34x_thermal_zone->lpat_table = acpi_lpat_get_conversion_table(
 								adev->handle);
 
-	int34x_thermal_zone->zone = thermal_zone_device_register(
+	int34x_thermal_zone->zone = thermal_zone_device_register_with_trips(
 						acpi_device_bid(adev),
+						int34x_thermal_zone->trips,
 						trip_cnt,
 						trip_mask, int34x_thermal_zone,
 						int34x_thermal_zone->ops,
@@ -272,9 +190,9 @@ struct int34x_thermal_zone *int340x_thermal_zone_add(struct acpi_device *adev,
 err_enable:
 	thermal_zone_device_unregister(int34x_thermal_zone->zone);
 err_thermal_zone:
+	kfree(int34x_thermal_zone->trips);
 	acpi_lpat_free_conversion_table(int34x_thermal_zone->lpat_table);
-	kfree(int34x_thermal_zone->aux_trips);
-err_trip_alloc:
+err_trips_alloc:
 	kfree(int34x_thermal_zone->ops);
 err_ops_alloc:
 	kfree(int34x_thermal_zone);
@@ -287,7 +205,7 @@ void int340x_thermal_zone_remove(struct int34x_thermal_zone
 {
 	thermal_zone_device_unregister(int34x_thermal_zone->zone);
 	acpi_lpat_free_conversion_table(int34x_thermal_zone->lpat_table);
-	kfree(int34x_thermal_zone->aux_trips);
+	kfree(int34x_thermal_zone->trips);
 	kfree(int34x_thermal_zone->ops);
 	kfree(int34x_thermal_zone);
 }
diff --git a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
index e28ab1ba5e06..0c2c8de92014 100644
--- a/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
+++ b/drivers/thermal/intel/int340x_thermal/int340x_thermal_zone.h
@@ -10,6 +10,7 @@
 #include <acpi/acpi_lpat.h>
 
 #define INT340X_THERMAL_MAX_ACT_TRIP_COUNT	10
+#define INT340X_THERMAL_MAX_TRIP_COUNT INT340X_THERMAL_MAX_ACT_TRIP_COUNT + 3
 
 struct active_trip {
 	int temp;
@@ -19,15 +20,8 @@ struct active_trip {
 
 struct int34x_thermal_zone {
 	struct acpi_device *adev;
-	struct active_trip act_trips[INT340X_THERMAL_MAX_ACT_TRIP_COUNT];
-	unsigned long *aux_trips;
+	struct thermal_trip *trips;
 	int aux_trip_nr;
-	int psv_temp;
-	int psv_trip_id;
-	int crt_temp;
-	int crt_trip_id;
-	int hot_temp;
-	int hot_trip_id;
 	struct thermal_zone_device *zone;
 	struct thermal_zone_device_ops *ops;
 	void *priv_data;
-- 
2.34.1

Re: [PATCH v6 0/3] Thermal ACPI APIs for generic trip points

[Daniel Lezcano]

On 21/01/2023 00:15, Daniel Lezcano wrote:
> Recently sent as a RFC, the thermal ACPI for generic trip points is a set of
> functions to fill the generic trip points structure which will become the
> standard structure for the thermal framework and its users.
> 
> Different Intel drivers and the ACPI thermal driver are using the ACPI tables to
> get the thermal zone information. As those are getting the same information,
> providing this set of ACPI function with the generic trip points will
> consolidate the code.
> 
> Also, the Intel PCH and the Intel 34xx drivers are converted to use the generic
> trip points relying on the ACPI generic trip point parsing functions.
> 
> These changes have been tested on a Thinkpad Lenovo x280 with the PCH and
> INT34xx drivers. No regression have been observed, the trip points remain the
> same for what is described on this system.

I forgot to mention this series apply on

git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git 
linux-pm/thermal

Thanks

> Changelog:
>   - V6:
>     - Changed thermal ACPI function names according the changes done in the first patch
>     - Put back the GTSH function here as it is specific to int340x
>     - Propagate the function name change from thermal ACPI
>     - Changed the functions name and prototype to return the temperature
>       instead of passing a pointer
>     - Removed the GTSH function as it does not belong to the ACPI standard
>     - Changed hysteresis -> hyst, temperature -> temp
>     - Changed message level info -> debug
>     - Changed error messages
>     - Return -ENODATA error only
>     - Fixed description functions
>   
>   - V5:
>     - Fixed GTSH unit conversion, deciK -> milli C
> 
>   - V4:
>     - Fixed Kconfig option dependency, select THERMAL_ACPI if ACPI is set
>       only for the PCH driver
> 
>   - V3:
>     - Took into account Rafael's comments
>     - Used a silence option THERMAL_ACPI in order to stay consistent
>       with THERMAL_OF. It is up to the API user to select the option.
> 
>   - V2:
>     - Fix the thermal ACPI patch where the thermal_acpi.c was not included in
>       the series
>     - Provide a couple of users of this API which could have been tested on a
>       real system
> 
> Daniel Lezcano (3):
>    thermal/acpi: Add ACPI trip point routines
>    thermal/drivers/intel: Use generic trip points for intel_pch
>    thermal/drivers/intel: Use generic trip points int340x
> 
>   drivers/thermal/Kconfig                       |   4 +
>   drivers/thermal/Makefile                      |   1 +
>   drivers/thermal/intel/Kconfig                 |   1 +
>   drivers/thermal/intel/int340x_thermal/Kconfig |   1 +
>   .../int340x_thermal/int340x_thermal_zone.c    | 168 ++++------------
>   .../int340x_thermal/int340x_thermal_zone.h    |  10 +-
>   drivers/thermal/intel/intel_pch_thermal.c     |  88 ++-------
>   drivers/thermal/thermal_acpi.c                | 185 ++++++++++++++++++
>   include/linux/thermal.h                       |   7 +
>   9 files changed, 263 insertions(+), 202 deletions(-)
>   create mode 100644 drivers/thermal/thermal_acpi.c
> 

-- 
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Re: [PATCH v6 1/3] thermal/acpi: Add ACPI trip point routines

[Rafael J. Wysocki]

On Saturday, January 21, 2023 12:15:28 AM CET Daniel Lezcano wrote:
> The ACPI specification describes the trip points, the device tree
> bindings as well.
> 
> The OF code uses the generic trip point structures.
> 
> The ACPI has their own trip points structure and uses the get_trip_*
> ops to retrieve them.
> 
> We can do the same as the OF code and create a set of ACPI functions
> to retrieve a trip point description. Having a common code for ACPI
> will help to cleanup the remaining Intel drivers and get rid of the
> get_trip_* functions.
> 
> These changes add the ACPI thermal calls to retrieve the basic
> information we need to be reused in the thermal ACPI and Intel
> drivers.
> 
> The different ACPI functions have the generic trip point structure
> passed as parameter where it is filled.
> 
> This structure aims to be the one used by all the thermal drivers and
> the thermal framework.
> 
> After this series, a couple of Intel drivers and the ACPI thermal
> driver will still have their own trip points definition but a new
> series on top of this one will finish the conversion to the generic
> trip point handling.
> 
> This series depends on the generic trip point added to the thermal
> framework and available in the thermal/linux-next branch.
> 
>  https://lkml.org/lkml/2022/10/3/456
> 
> It has been tested on a Intel i7-8650U - x280 with the INT3400, the
> PCH, ACPITZ, and x86_pkg_temp. No regression observed so far.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
> Reviewed-by: Zhang Rui <rui.zhang@intel.com>
> Tested-by: srinivas pandruvada <srinivas.pandruvada@linux.intel.com>

Co-developed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Also I'm not sure if this version has been tested and reviewed.

There are still a few things to improve in it, but overall I think that
something like the patch below would be better - it is fewer lines of code
and less duplication.

I haven't compiled it, but it should be easy enough to fix if it fails to
build.  I am also not sure about the included header files (kernel.h and
uapi/linux/thermal.h in particular).

---
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Subject: [PATCH] thermal: ACPI: Add ACPI trip point routines

Add library routines to populate a generic thermal trip point
structure with data obtained by evaluating a specific object in the
ACPI Namespace.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Co-developed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
 drivers/thermal/Kconfig        |    4 +
 drivers/thermal/Makefile       |    1 
 drivers/thermal/thermal_acpi.c |  153 +++++++++++++++++++++++++++++++++++++++++
 include/linux/thermal.h        |    8 ++
 4 files changed, 166 insertions(+)
 create mode 100644 drivers/thermal/thermal_acpi.c

Index: linux-pm/drivers/thermal/Kconfig
===================================================================
--- linux-pm.orig/drivers/thermal/Kconfig
+++ linux-pm/drivers/thermal/Kconfig
@@ -76,6 +76,10 @@ config THERMAL_OF
 	  Say 'Y' here if you need to build thermal infrastructure
 	  based on device tree.
 
+config THERMAL_ACPI
+       depends on ACPI
+       bool
+
 config THERMAL_WRITABLE_TRIPS
 	bool "Enable writable trip points"
 	help
Index: linux-pm/drivers/thermal/Makefile
===================================================================
--- linux-pm.orig/drivers/thermal/Makefile
+++ linux-pm/drivers/thermal/Makefile
@@ -13,6 +13,7 @@ thermal_sys-$(CONFIG_THERMAL_NETLINK)		+
 # interface to/from other layers providing sensors
 thermal_sys-$(CONFIG_THERMAL_HWMON)		+= thermal_hwmon.o
 thermal_sys-$(CONFIG_THERMAL_OF)		+= thermal_of.o
+thermal_sys-$(CONFIG_THERMAL_ACPI)		+= thermal_acpi.o
 
 # governors
 thermal_sys-$(CONFIG_THERMAL_GOV_FAIR_SHARE)	+= gov_fair_share.o
Index: linux-pm/drivers/thermal/thermal_acpi.c
===================================================================
--- /dev/null
+++ linux-pm/drivers/thermal/thermal_acpi.c
@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2023 Linaro Limited
+ * Copyright 2023 Intel Corporation
+ *
+ * Library routines for populating a generic thermal trip point structure
+ * with data obtained by evaluating a specific object in the ACPI Namespace.
+ */
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/units.h>
+#include <uapi/linux/thermal.h>
+
+#include "thermal_core.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	2180
+#define TEMP_MAX_DECIK	4480
+
+static int thermal_acpi_trip_init(struct acpi_device *adev,
+				  enum thermal_trip_type type, int id,
+				  struct thermal_trip *trip)
+{
+	unsigned long long temp;
+	acpi_status status;
+	char obj_name[5];
+
+	switch (type) {
+	case THERMAL_TRIP_ACTIVE:
+		if (id < 0 || id > 9)
+			return -EINVAL;
+
+		obj_name[1] = 'A';
+		obj_name[2] = 'C';
+		obj_name[3] = '0' + id;
+		break;
+	case THERMAL_TRIP_PASSIVE:
+		obj_name[1] = 'P';
+		obj_name[2] = 'S';
+		obj_name[3] = 'V';
+		break;
+	case THERMAL_TRIP_HOT:
+		obj_name[1] = 'H';
+		obj_name[2] = 'O';
+		obj_name[3] = 'T';
+		break;
+	case THERMAL_TRIP_CRITICAL:
+		obj_name[1] = 'C';
+		obj_name[2] = 'R';
+		obj_name[3] = 'T';
+		break;
+	}
+
+	obj_name[0] = '_';
+	obj_name[4] = '\0';
+
+	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) {
+		acpi_handle_debug(adev->handle, "%s result %llu out of range\n",
+				  temp, obj_name);
+		return -ENODATA;
+	}
+
+	trip->temperature = deci_kelvin_to_millicelsius(temp);
+	trip->hysteresis = 0;
+	trip->type = type;
+
+	return 0;
+}
+
+/**
+ * thermal_acpi_trip_active - Get the specified active trip point
+ * @adev: Thermal zone ACPI device object to get the description from.
+ * @id: Active cooling level (0 - 9).
+ * @trip: Trip point structure to be populated 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 and initialize @trip as an active trip point using
+ * that temperature value.
+ *
+ * Return 0 on success or a negative error value on failure.
+ */
+int thermal_acpi_trip_active(struct acpi_device *adev, int id,
+			     struct thermal_trip *trip)
+{
+	return thermal_acpi_trip_init(adev, THERMAL_TRIP_ACTIVE, id, trip);
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_trip_active);
+
+/**
+ * thermal_acpi_trip_passive - Get the passive trip point
+ * @adev: Thermal zone ACPI device object to get the description from.
+ * @trip: Trip point structure to be populated on success.
+ *
+ * Evaluate the _PSV object for the thermal zone represented by @adev to obtain
+ * the temperature of the passive cooling trip point and initialize @trip as a
+ * passive trip point using that temperature value.
+ *
+ * Return 0 on success or -ENODATA on failure.
+ */
+int thermal_acpi_trip_passive(struct acpi_device *adev, struct thermal_trip *trip)
+{
+	return thermal_acpi_trip_init(adev, THERMAL_TRIP_PASSIVE, INT_MAX, trip);
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_trip_passive);
+
+/**
+ * thermal_acpi_trip_hot - Get the near critical trip point
+ * @adev: the ACPI device to get the description from.
+ * @trip: a &struct thermal_trip to be filled if the function succeed.
+ *
+ * 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 and initialize @trip as a hot trip point using that
+ * temperature value.
+ *
+ * Return 0 on success or -ENODATA on failure.
+ */
+int thermal_acpi_trip_hot(struct acpi_device *adev, struct thermal_trip *trip)
+{
+	return thermal_acpi_trip_init(adev, THERMAL_TRIP_HOT, INT_MAX, trip);
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_trip_hot);
+
+/**
+ * thermal_acpi_trip_critical - Get the critical trip point
+ * @adev: the ACPI device to get the description from.
+ * @trip: a &struct thermal_trip to be filled if the function succeed.
+ *
+ * Evaluate the _CRT object for the thermal zone represented by @adev to obtain
+ * the temperature of the critical cooling trip point and initialize @trip as a
+ * critical trip point using that temperature value.
+ *
+ * Return 0 on success or -ENODATA on failure.
+ */
+int thermal_acpi_trip_critical(struct acpi_device *adev, struct thermal_trip *trip)
+{
+	return thermal_acpi_trip_init(adev, THERMAL_TRIP_CRITICAL, INT_MAX, trip);
+}
+EXPORT_SYMBOL_GPL(thermal_acpi_trip_critical);
Index: linux-pm/include/linux/thermal.h
===================================================================
--- linux-pm.orig/include/linux/thermal.h
+++ linux-pm/include/linux/thermal.h
@@ -334,6 +334,14 @@ static inline void devm_thermal_of_zone_
 }
 #endif
 
+#ifdef CONFIG_THERMAL_ACPI
+int thermal_acpi_trip_active(struct acpi_device *adev, int id,
+			     struct thermal_trip *trip);
+int thermal_acpi_trip_passive(struct acpi_device *adev, struct thermal_trip *trip);
+int thermal_acpi_trip_hot(struct acpi_device *adev, struct thermal_trip *trip);
+int thermal_acpi_trip_critical(struct acpi_device *adev, struct thermal_trip *trip);
+#endif
+
 #ifdef CONFIG_THERMAL
 struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
 		void *, struct thermal_zone_device_ops *,

Re: [PATCH v6 1/3] thermal/acpi: Add ACPI trip point routines

[Daniel Lezcano]

On 22/01/2023 23:08, Rafael J. Wysocki wrote:
> On Saturday, January 21, 2023 12:15:28 AM CET Daniel Lezcano wrote:
>> The ACPI specification describes the trip points, the device tree
>> bindings as well.
>>
>> The OF code uses the generic trip point structures.
>>
>> The ACPI has their own trip points structure and uses the get_trip_*
>> ops to retrieve them.
>>
>> We can do the same as the OF code and create a set of ACPI functions
>> to retrieve a trip point description. Having a common code for ACPI
>> will help to cleanup the remaining Intel drivers and get rid of the
>> get_trip_* functions.
>>
>> These changes add the ACPI thermal calls to retrieve the basic
>> information we need to be reused in the thermal ACPI and Intel
>> drivers.
>>
>> The different ACPI functions have the generic trip point structure
>> passed as parameter where it is filled.
>>
>> This structure aims to be the one used by all the thermal drivers and
>> the thermal framework.
>>
>> After this series, a couple of Intel drivers and the ACPI thermal
>> driver will still have their own trip points definition but a new
>> series on top of this one will finish the conversion to the generic
>> trip point handling.
>>
>> This series depends on the generic trip point added to the thermal
>> framework and available in the thermal/linux-next branch.
>>
>>   https://lkml.org/lkml/2022/10/3/456
>>
>> It has been tested on a Intel i7-8650U - x280 with the INT3400, the
>> PCH, ACPITZ, and x86_pkg_temp. No regression observed so far.
>>
>> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
>> Reviewed-by: Zhang Rui <rui.zhang@intel.com>
>> Tested-by: srinivas pandruvada <srinivas.pandruvada@linux.intel.com>
> 
> Co-developed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Also I'm not sure if this version has been tested and reviewed.
> 
> There are still a few things to improve in it, but overall I think that
> something like the patch below would be better - it is fewer lines of code
> and less duplication.

I'm always in favor of the simplest code, in terms of line of code and 
readability. I'm perfectly fine with your proposal.


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