Merge back earlier thermal control updates for 5.19-rc1.

Documentation/devicetree/bindings/thermal/qcom-lmh.yaml

@@ -18,6 +18,7 @@ description:
 properties:
   compatible:
     enum:
+      - qcom,sc8180x-lmh
       - qcom,sdm845-lmh
       - qcom,sm8150-lmh
 

Documentation/devicetree/bindings/thermal/qcom-spmi-adc-tm5.yaml

@@ -10,7 +10,9 @@ maintainers:
 
 properties:
   compatible:
-    const: qcom,spmi-adc-tm5
+    enum:
+      - qcom,spmi-adc-tm5
+      - qcom,spmi-adc-tm5-gen2
 
   reg:
     maxItems: 1
@@ -33,6 +35,7 @@ properties:
   qcom,avg-samples:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: Number of samples to be used for measurement.
+            Not applicable for Gen2 ADC_TM peripheral.
     enum:
       - 1
       - 2
@@ -45,6 +48,7 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     description: This parameter is used to decrease ADC sampling rate.
             Quicker measurements can be made by reducing decimation ratio.
+            Not applicable for Gen2 ADC_TM peripheral.
     enum:
       - 250
       - 420
@@ -93,6 +97,29 @@ patternProperties:
           - const: 1
           - enum: [ 1, 3, 4, 6, 20, 8, 10 ]
 
+      qcom,avg-samples:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: Number of samples to be used for measurement.
+          This property in child node is applicable only for Gen2 ADC_TM peripheral.
+        enum:
+          - 1
+          - 2
+          - 4
+          - 8
+          - 16
+        default: 1
+
+      qcom,decimation:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: This parameter is used to decrease ADC sampling rate.
+          Quicker measurements can be made by reducing decimation ratio.
+          This property in child node is applicable only for Gen2 ADC_TM peripheral.
+        enum:
+          - 85
+          - 340
+          - 1360
+        default: 1360
+
     required:
       - reg
       - io-channels
@@ -100,6 +127,31 @@ patternProperties:
     additionalProperties:
       false
 
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: qcom,spmi-adc-tm5
+
+    then:
+      patternProperties:
+        "^([-a-z0-9]*)@[0-7]$":
+          properties:
+            qcom,decimation: false
+            qcom,avg-samples: false
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: qcom,spmi-adc-tm5-gen2
+
+    then:
+      properties:
+        qcom,avg-samples: false
+        qcom,decimation: false
+
 required:
   - compatible
   - reg
@@ -124,7 +176,7 @@ examples:
             #size-cells = <0>;
             #io-channel-cells = <1>;
 
-            /* Other propreties are omitted */
+            /* Other properties are omitted */
             conn-therm@4f {
                 reg = <ADC5_AMUX_THM3_100K_PU>;
                 qcom,ratiometric;
@@ -148,4 +200,58 @@ examples:
             };
         };
     };
+
+  - |
+    #include <dt-bindings/iio/qcom,spmi-adc7-pmk8350.h>
+    #include <dt-bindings/iio/qcom,spmi-adc7-pm8350.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spmi_bus {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        pmk8350_vadc: adc@3100 {
+            reg = <0x3100>;
+            compatible = "qcom,spmi-adc7";
+            #address-cells = <1>;
+            #size-cells = <0>;
+            #io-channel-cells = <1>;
+
+            /* Other properties are omitted */
+            xo-therm@44 {
+                reg = <PMK8350_ADC7_AMUX_THM1_100K_PU>;
+                qcom,ratiometric;
+                qcom,hw-settle-time = <200>;
+            };
+
+            conn-therm@47 {
+                reg = <PM8350_ADC7_AMUX_THM4_100K_PU>;
+                qcom,ratiometric;
+                qcom,hw-settle-time = <200>;
+            };
+        };
+
+        pmk8350_adc_tm: adc-tm@3400 {
+            compatible = "qcom,spmi-adc-tm5-gen2";
+            reg = <0x3400>;
+            interrupts = <0x0 0x34 0x0 IRQ_TYPE_EDGE_RISING>;
+            #thermal-sensor-cells = <1>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            pmk8350-xo-therm@0 {
+                reg = <0>;
+                io-channels = <&pmk8350_vadc PMK8350_ADC7_AMUX_THM1_100K_PU>;
+                qcom,decimation = <340>;
+                qcom,ratiometric;
+                qcom,hw-settle-time-us = <200>;
+            };
+
+            conn-therm@1 {
+                reg = <1>;
+                io-channels = <&pmk8350_vadc PM8350_ADC7_AMUX_THM4_100K_PU>;
+                qcom,avg-samples = <2>;
+                qcom,ratiometric;
+                qcom,hw-settle-time-us = <200>;
+            };
+        };
+    };
 ...

Documentation/devicetree/bindings/thermal/qcom-tsens.yaml

@@ -19,10 +19,11 @@ description: |
 properties:
   compatible:
     oneOf:
-      - description: msm9860 TSENS based
+      - description: msm8960 TSENS based
         items:
           - enum:
               - qcom,ipq8064-tsens
+              - qcom,msm8960-tsens
 
       - description: v0.1 of TSENS
         items:
@@ -49,6 +50,7 @@ properties:
               - qcom,sc7180-tsens
               - qcom,sc7280-tsens
               - qcom,sc8180x-tsens
+              - qcom,sc8280xp-tsens
               - qcom,sdm630-tsens
               - qcom,sdm845-tsens
               - qcom,sm8150-tsens
@@ -116,6 +118,7 @@ allOf:
               - qcom,ipq8064-tsens
               - qcom,mdm9607-tsens
               - qcom,msm8916-tsens
+              - qcom,msm8960-tsens
               - qcom,msm8974-tsens
               - qcom,msm8976-tsens
               - qcom,qcs404-tsens

Documentation/devicetree/bindings/thermal/rzg2l-thermal.yaml

@@ -17,7 +17,9 @@ properties:
   compatible:
     items:
       - enum:
+          - renesas,r9a07g043-tsu # RZ/G2UL
           - renesas,r9a07g044-tsu # RZ/G2{L,LC}
+          - renesas,r9a07g054-tsu # RZ/V2L
       - const: renesas,rzg2l-tsu
 
   reg:

Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/thermal/ti,j72xx-thermal.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments J72XX VTM (DTS) binding
+
+maintainers:
+  - Keerthy <j-keerthy@ti.com>
+
+properties:
+  compatible:
+    enum:
+      - ti,j721e-vtm
+      - ti,j7200-vtm
+
+  reg:
+    items:
+      - description: VTM cfg1 register space
+      - description: VTM cfg2 register space
+      - description: VTM efuse register space
+
+  power-domains:
+    maxItems: 1
+
+  "#thermal-sensor-cells":
+    const: 1
+
+required:
+  - compatible
+  - reg
+  - power-domains
+  - "#thermal-sensor-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/soc/ti,sci_pm_domain.h>
+    wkup_vtm0: thermal-sensor@42040000 {
+        compatible = "ti,j721e-vtm";
+        reg = <0x42040000 0x350>,
+              <0x42050000 0x350>,
+              <0x43000300 0x10>;
+        power-domains = <&k3_pds 154 TI_SCI_PD_EXCLUSIVE>;
+        #thermal-sensor-cells = <1>;
+    };
+
+    mpu_thermal: mpu-thermal {
+        polling-delay-passive = <250>; /* milliseconds */
+        polling-delay = <500>; /* milliseconds */
+        thermal-sensors = <&wkup_vtm0 0>;
+
+        trips {
+            mpu_crit: mpu-crit {
+                temperature = <125000>; /* milliCelsius */
+                hysteresis = <2000>; /* milliCelsius */
+                type = "critical";
+            };
+        };
+    };
+...

MAINTAINERS

@@ -19544,6 +19544,7 @@ F:	drivers/thermal/
 F:	include/linux/cpu_cooling.h
 F:	include/linux/thermal.h
 F:	include/uapi/linux/thermal.h
+F:	tools/lib/thermal/
 F:	tools/thermal/
 
 THERMAL DRIVER FOR AMLOGIC SOCS

drivers/iio/adc/qcom-vadc-common.c

@@ -677,6 +677,17 @@ u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
 }
 EXPORT_SYMBOL(qcom_adc_tm5_temp_volt_scale);
 
+u16 qcom_adc_tm5_gen2_temp_res_scale(int temp)
+{
+	int64_t resistance;
+
+	resistance = qcom_vadc_map_temp_voltage(adcmap7_100k,
+		ARRAY_SIZE(adcmap7_100k), temp);
+
+	return div64_s64(resistance * RATIO_MAX_ADC7, resistance + R_PU_100K);
+}
+EXPORT_SYMBOL(qcom_adc_tm5_gen2_temp_res_scale);
+
 int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
 		    unsigned int prescale_ratio,
 		    const struct adc5_data *data,

drivers/thermal/Makefile

@@ -28,7 +28,7 @@ thermal_sys-$(CONFIG_CPU_IDLE_THERMAL)	+= cpuidle_cooling.o
 # devfreq cooling
 thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
 
-obj-$(CONFIG_K3_THERMAL)	+= k3_bandgap.o
+obj-$(CONFIG_K3_THERMAL)	+= k3_bandgap.o k3_j72xx_bandgap.o
 # platform thermal drivers
 obj-y				+= broadcom/
 obj-$(CONFIG_THERMAL_MMIO)		+= thermal_mmio.o

drivers/thermal/broadcom/bcm2711_thermal.c

@@ -38,7 +38,6 @@ static int bcm2711_get_temp(void *data, int *temp)
 	int offset = thermal_zone_get_offset(priv->thermal);
 	u32 val;
 	int ret;
-	long t;
 
 	ret = regmap_read(priv->regmap, AVS_RO_TEMP_STATUS, &val);
 	if (ret)
@@ -50,9 +49,7 @@ static int bcm2711_get_temp(void *data, int *temp)
 	val &= AVS_RO_TEMP_STATUS_DATA_MSK;
 
 	/* Convert a HW code to a temperature reading (millidegree celsius) */
-	t = slope * val + offset;
-
-	*temp = t < 0 ? 0 : t;
+	*temp = slope * val + offset;
 
 	return 0;
 }

drivers/thermal/broadcom/sr-thermal.c

@@ -60,6 +60,9 @@ static int sr_thermal_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENOENT;
+
 	sr_thermal->regs = (void __iomem *)devm_memremap(&pdev->dev, res->start,
 							 resource_size(res),
 							 MEMREMAP_WB);

drivers/thermal/imx_sc_thermal.c

@@ -94,8 +94,8 @@ static int imx_sc_thermal_probe(struct platform_device *pdev)
 		sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL);
 		if (!sensor) {
 			of_node_put(child);
-			of_node_put(sensor_np);
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto put_node;
 		}
 
 		ret = thermal_zone_of_get_sensor_id(child,
@@ -124,7 +124,9 @@ static int imx_sc_thermal_probe(struct platform_device *pdev)
 			dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n");
 	}
 
+put_node:
 	of_node_put(sensor_np);
+	of_node_put(np);
 
 	return ret;
 }

drivers/thermal/intel/int340x_thermal/int3400_thermal.c

@@ -194,12 +194,31 @@ static int int3400_thermal_run_osc(acpi_handle handle, char *uuid_str, int *enab
 	return result;
 }
 
+static int set_os_uuid_mask(struct int3400_thermal_priv *priv, u32 mask)
+{
+	int cap = 0;
+
+	/*
+	 * Capability bits:
+	 * Bit 0: set to 1 to indicate DPTF is active
+	 * Bi1 1: set to 1 to active cooling is supported by user space daemon
+	 * Bit 2: set to 1 to passive cooling is supported by user space daemon
+	 * Bit 3: set to 1 to critical trip is handled by user space daemon
+	 */
+	if (mask)
+		cap = (priv->os_uuid_mask << 1) | 0x01;
+
+	return int3400_thermal_run_osc(priv->adev->handle,
+				       "b23ba85d-c8b7-3542-88de-8de2ffcfd698",
+				       &cap);
+}
+
 static ssize_t current_uuid_store(struct device *dev,
 				  struct device_attribute *attr,
 				  const char *buf, size_t count)
 {
 	struct int3400_thermal_priv *priv = dev_get_drvdata(dev);
-	int i;
+	int ret, i;
 
 	for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) {
 		if (!strncmp(buf, int3400_thermal_uuids[i],
@@ -231,19 +250,7 @@ static ssize_t current_uuid_store(struct device *dev,
 	}
 
 	if (priv->os_uuid_mask) {
-		int cap, ret;
-
-		/*
-		 * Capability bits:
-		 * Bit 0: set to 1 to indicate DPTF is active
-		 * Bi1 1: set to 1 to active cooling is supported by user space daemon
-		 * Bit 2: set to 1 to passive cooling is supported by user space daemon
-		 * Bit 3: set to 1 to critical trip is handled by user space daemon
-		 */
-		cap = ((priv->os_uuid_mask << 1) | 0x01);
-		ret = int3400_thermal_run_osc(priv->adev->handle,
-					      "b23ba85d-c8b7-3542-88de-8de2ffcfd698",
-					      &cap);
+		ret = set_os_uuid_mask(priv, priv->os_uuid_mask);
 		if (ret)
 			return ret;
 	}
@@ -469,17 +476,26 @@ static int int3400_thermal_change_mode(struct thermal_zone_device *thermal,
 	if (mode != thermal->mode) {
 		int enabled;
 
+		enabled = mode == THERMAL_DEVICE_ENABLED;
+
+		if (priv->os_uuid_mask) {
+			if (!enabled) {
+				priv->os_uuid_mask = 0;
+				result = set_os_uuid_mask(priv, priv->os_uuid_mask);
+			}
+			goto eval_odvp;
+		}
+
 		if (priv->current_uuid_index < 0 ||
 		    priv->current_uuid_index >= INT3400_THERMAL_MAXIMUM_UUID)
 			return -EINVAL;
 
-		enabled = (mode == THERMAL_DEVICE_ENABLED);
 		result = int3400_thermal_run_osc(priv->adev->handle,
 						 int3400_thermal_uuids[priv->current_uuid_index],
 						 &enabled);
 	}
 
-
+eval_odvp:
 	evaluate_odvp(priv);
 
 	return result;

drivers/thermal/k3_bandgap.c

@@ -16,6 +16,8 @@
 #include <linux/thermal.h>
 #include <linux/types.h>
 
+#include "thermal_hwmon.h"
+
 #define K3_VTM_DEVINFO_PWR0_OFFSET		0x4
 #define K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK	0xf0
 #define K3_VTM_TMPSENS0_CTRL_OFFSET	0x80
@@ -219,6 +221,9 @@ static int k3_bandgap_probe(struct platform_device *pdev)
 			ret = PTR_ERR(data[id].tzd);
 			goto err_alloc;
 		}
+
+		if (devm_thermal_add_hwmon_sysfs(data[id].tzd))
+			dev_warn(dev, "Failed to add hwmon sysfs attributes\n");
 	}
 
 	platform_set_drvdata(pdev, bgp);

drivers/thermal/qcom/lmh.c

@@ -220,6 +220,7 @@ static int lmh_probe(struct platform_device *pdev)
 }
 
 static const struct of_device_id lmh_table[] = {
+	{ .compatible = "qcom,sc8180x-lmh", },
 	{ .compatible = "qcom,sdm845-lmh", .data = (void *)LMH_ENABLE_ALGOS},
 	{ .compatible = "qcom,sm8150-lmh", },
 	{}

drivers/thermal/qcom/tsens.c

@@ -979,6 +979,9 @@ static const struct of_device_id tsens_table[] = {
 	}, {
 		.compatible = "qcom,msm8939-tsens",
 		.data = &data_8939,
+	}, {
+		.compatible = "qcom,msm8960-tsens",
+		.data = &data_8960,
 	}, {
 		.compatible = "qcom,msm8974-tsens",
 		.data = &data_8974,

drivers/thermal/rcar_thermal.c

@@ -445,7 +445,7 @@ static int rcar_thermal_probe(struct platform_device *pdev)
 	struct rcar_thermal_common *common;
 	struct rcar_thermal_priv *priv;
 	struct device *dev = &pdev->dev;
-	struct resource *res, *irq;
+	struct resource *res;
 	const struct rcar_thermal_chip *chip = of_device_get_match_data(dev);
 	int mres = 0;
 	int i;
@@ -467,9 +467,16 @@ static int rcar_thermal_probe(struct platform_device *pdev)
 	pm_runtime_get_sync(dev);
 
 	for (i = 0; i < chip->nirqs; i++) {
-		irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
-		if (!irq)
-			continue;
+		int irq;
+
+		ret = platform_get_irq_optional(pdev, i);
+		if (ret < 0 && ret != -ENXIO)
+			goto error_unregister;
+		if (ret > 0)
+			irq = ret;
+		else
+			break;
+
 		if (!common->base) {
 			/*
 			 * platform has IRQ support.
@@ -487,7 +494,7 @@ static int rcar_thermal_probe(struct platform_device *pdev)
 			idle = 0; /* polling delay is not needed */
 		}
 
-		ret = devm_request_irq(dev, irq->start, rcar_thermal_irq,
+		ret = devm_request_irq(dev, irq, rcar_thermal_irq,
 				       IRQF_SHARED, dev_name(dev), common);
 		if (ret) {
 			dev_err(dev, "irq request failed\n ");

drivers/thermal/rzg2l_thermal.c

@@ -32,6 +32,8 @@
 #define TSU_SS		0x10
 
 #define OTPTSUTRIM_REG(n)	(0x18 + ((n) * 0x4))
+#define OTPTSUTRIM_EN_MASK	BIT(31)
+#define OTPTSUTRIM_MASK		GENMASK(11, 0)
 
 /* Sensor Mode Register(TSU_SM) */
 #define TSU_SM_EN_TS		BIT(0)
@@ -183,11 +185,15 @@ static int rzg2l_thermal_probe(struct platform_device *pdev)
 	pm_runtime_get_sync(dev);
 
 	priv->calib0 = rzg2l_thermal_read(priv, OTPTSUTRIM_REG(0));
-	if (!priv->calib0)
+	if (priv->calib0 & OTPTSUTRIM_EN_MASK)
+		priv->calib0 &= OTPTSUTRIM_MASK;
+	else
 		priv->calib0 = SW_CALIB0_VAL;
 
 	priv->calib1 = rzg2l_thermal_read(priv, OTPTSUTRIM_REG(1));
-	if (!priv->calib1)
+	if (priv->calib1 & OTPTSUTRIM_EN_MASK)
+		priv->calib1 &= OTPTSUTRIM_MASK;
+	else
 		priv->calib1 = SW_CALIB1_VAL;
 
 	platform_set_drvdata(pdev, priv);

drivers/thermal/thermal_core.c

@@ -947,6 +947,7 @@ __thermal_cooling_device_register(struct device_node *np,
 	return cdev;
 
 out_kfree_type:
+	thermal_cooling_device_destroy_sysfs(cdev);
 	kfree(cdev->type);
 	put_device(&cdev->device);
 	cdev = NULL;

drivers/thermal/thermal_of.c

@@ -35,7 +35,7 @@ struct __thermal_cooling_bind_param {
 };
 
 /**
- * struct __thermal_bind_param - a match between trip and cooling device
+ * struct __thermal_bind_params - a match between trip and cooling device
  * @tcbp: a pointer to an array of cooling devices
  * @count: number of elements in array
  * @trip_id: the trip point index
@@ -203,6 +203,14 @@ static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip,
 	return data->ops->get_trend(data->sensor_data, trip, trend);
 }
 
+static int of_thermal_change_mode(struct thermal_zone_device *tz,
+				enum thermal_device_mode mode)
+{
+	struct __thermal_zone *data = tz->devdata;
+
+	return data->ops->change_mode(data->sensor_data, mode);
+}
+
 static int of_thermal_bind(struct thermal_zone_device *thermal,
 			   struct thermal_cooling_device *cdev)
 {
@@ -408,6 +416,9 @@ thermal_zone_of_add_sensor(struct device_node *zone,
 	if (ops->set_emul_temp)
 		tzd->ops->set_emul_temp = of_thermal_set_emul_temp;
 
+	if (ops->change_mode)
+		tzd->ops->change_mode = of_thermal_change_mode;
+
 	mutex_unlock(&tzd->lock);
 
 	return tzd;
@@ -569,6 +580,7 @@ void thermal_zone_of_sensor_unregister(struct device *dev,
 	tzd->ops->get_temp = NULL;
 	tzd->ops->get_trend = NULL;
 	tzd->ops->set_emul_temp = NULL;
+	tzd->ops->change_mode = NULL;
 
 	tz->ops = NULL;
 	tz->sensor_data = NULL;

include/linux/iio/adc/qcom-vadc-common.h

@@ -152,6 +152,8 @@ int qcom_adc5_hw_scale(enum vadc_scale_fn_type scaletype,
 u16 qcom_adc_tm5_temp_volt_scale(unsigned int prescale_ratio,
 				 u32 full_scale_code_volt, int temp);
 
+u16 qcom_adc_tm5_gen2_temp_res_scale(int temp);
+
 int qcom_adc5_prescaling_from_dt(u32 num, u32 den);
 
 int qcom_adc5_hw_settle_time_from_dt(u32 value, const unsigned int *hw_settle);

include/linux/thermal.h

@@ -299,6 +299,8 @@ struct thermal_zone_params {
  *		   temperature.
  * @set_trip_temp: a pointer to a function that sets the trip temperature on
  *		   hardware.
+ * @change_mode: a pointer to a function that notifies the thermal zone
+ *		   mode change.
  */
 struct thermal_zone_of_device_ops {
 	int (*get_temp)(void *, int *);
@@ -306,6 +308,7 @@ struct thermal_zone_of_device_ops {
 	int (*set_trips)(void *, int, int);
 	int (*set_emul_temp)(void *, int);
 	int (*set_trip_temp)(void *, int, int);
+	int (*change_mode) (void *, enum thermal_device_mode);
 };
 
 /* Function declarations */

tools/Makefile

@@ -31,6 +31,9 @@ help:
 	@echo '  bootconfig             - boot config tool'
 	@echo '  spi                    - spi tools'
 	@echo '  tmon                   - thermal monitoring and tuning tool'
+	@echo '  thermometer            - temperature capture tool'
+	@echo '  thermal-engine         - thermal monitoring tool'
+	@echo '  thermal                - thermal library'
 	@echo '  tracing                - misc tracing tools'
 	@echo '  turbostat              - Intel CPU idle stats and freq reporting tool'
 	@echo '  usb                    - USB testing tools'
@@ -85,12 +88,21 @@ perf: FORCE
 selftests: FORCE
 	$(call descend,testing/$@)
 
+thermal: FORCE
+	$(call descend,lib/$@)
+
 turbostat x86_energy_perf_policy intel-speed-select: FORCE
 	$(call descend,power/x86/$@)
 
 tmon: FORCE
 	$(call descend,thermal/$@)
 
+thermometer: FORCE
+	$(call descend,thermal/$@)
+
+thermal-engine: FORCE thermal
+	$(call descend,thermal/$@)
+
 freefall: FORCE
 	$(call descend,laptop/$@)
 
@@ -101,7 +113,7 @@ all: acpi cgroup counter cpupower gpio hv firewire \
 		perf selftests bootconfig spi turbostat usb \
 		virtio vm bpf x86_energy_perf_policy \
 		tmon freefall iio objtool kvm_stat wmi \
-		pci debugging tracing
+		pci debugging tracing thermal thermometer thermal-engine
 
 acpi_install:
 	$(call descend,power/$(@:_install=),install)
@@ -115,12 +127,21 @@ cgroup_install counter_install firewire_install gpio_install hv_install iio_inst
 selftests_install:
 	$(call descend,testing/$(@:_install=),install)
 
+thermal_install:
+	$(call descend,lib/$(@:_install=),install)
+
 turbostat_install x86_energy_perf_policy_install intel-speed-select_install:
 	$(call descend,power/x86/$(@:_install=),install)
 
 tmon_install:
 	$(call descend,thermal/$(@:_install=),install)
 
+thermometer_install:
+	$(call descend,thermal/$(@:_install=),install)
+
+thermal-engine_install:
+	$(call descend,thermal/$(@:_install=),install)
+
 freefall_install:
 	$(call descend,laptop/$(@:_install=),install)
 
@@ -133,7 +154,7 @@ install: acpi_install cgroup_install counter_install cpupower_install gpio_insta
 		virtio_install vm_install bpf_install x86_energy_perf_policy_install \
 		tmon_install freefall_install objtool_install kvm_stat_install \
 		wmi_install pci_install debugging_install intel-speed-select_install \
-		tracing_install
+		tracing_install thermometer_install thermal-engine_install
 
 acpi_clean:
 	$(call descend,power/acpi,clean)
@@ -160,9 +181,18 @@ perf_clean:
 selftests_clean:
 	$(call descend,testing/$(@:_clean=),clean)
 
+thermal_clean:
+	$(call descend,lib/thermal,clean)
+
 turbostat_clean x86_energy_perf_policy_clean intel-speed-select_clean:
 	$(call descend,power/x86/$(@:_clean=),clean)
 
+thermometer_clean:
+	$(call descend,thermal/thermometer,clean)
+
+thermal-engine_clean:
+	$(call descend,thermal/thermal-engine,clean)
+
 tmon_clean:
 	$(call descend,thermal/tmon,clean)
 
@@ -177,6 +207,6 @@ clean: acpi_clean cgroup_clean counter_clean cpupower_clean hv_clean firewire_cl
 		vm_clean bpf_clean iio_clean x86_energy_perf_policy_clean tmon_clean \
 		freefall_clean build_clean libbpf_clean libsubcmd_clean \
 		gpio_clean objtool_clean leds_clean wmi_clean pci_clean firmware_clean debugging_clean \
-		intel-speed-select_clean tracing_clean
+		intel-speed-select_clean tracing_clean thermal_clean thermometer_clean thermal-engine_clean
 
 .PHONY: FORCE

tools/lib/thermal/.gitignore

+libthermal.so*
+libthermal.pc

tools/lib/thermal/Build

+libthermal-y += commands.o
+libthermal-y += events.o
+libthermal-y += thermal_nl.o
+libthermal-y += sampling.o
+libthermal-y += thermal.o

tools/lib/thermal/Makefile

+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+# Most of this file is copied from tools/lib/perf/Makefile
+
+LIBTHERMAL_VERSION = 0
+LIBTHERMAL_PATCHLEVEL = 0
+LIBTHERMAL_EXTRAVERSION = 1
+
+MAKEFLAGS += --no-print-directory
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+# $(info Determined 'srctree' to be $(srctree))
+endif
+
+INSTALL = install
+
+# Use DESTDIR for installing into a different root directory.
+# This is useful for building a package. The program will be
+# installed in this directory as if it was the root directory.
+# Then the build tool can move it later.
+DESTDIR ?=
+DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
+
+include $(srctree)/tools/scripts/Makefile.include
+include $(srctree)/tools/scripts/Makefile.arch
+
+ifeq ($(LP64), 1)
+  libdir_relative = lib64
+else
+  libdir_relative = lib
+endif
+
+prefix ?=
+libdir = $(prefix)/$(libdir_relative)
+
+# Shell quotes
+libdir_SQ = $(subst ','\'',$(libdir))
+libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
+
+ifeq ("$(origin V)", "command line")
+  VERBOSE = $(V)
+endif
+ifndef VERBOSE
+  VERBOSE = 0
+endif
+
+ifeq ($(VERBOSE),1)
+  Q =
+else
+  Q = @
+endif
+
+# Set compile option CFLAGS
+ifdef EXTRA_CFLAGS
+  CFLAGS := $(EXTRA_CFLAGS)
+else
+  CFLAGS := -g -Wall
+endif
+
+INCLUDES = \
+-I/usr/include/libnl3 \
+-I$(srctree)/tools/lib/thermal/include \
+-I$(srctree)/tools/lib/ \
+-I$(srctree)/tools/include \
+-I$(srctree)/tools/arch/$(SRCARCH)/include/ \
+-I$(srctree)/tools/arch/$(SRCARCH)/include/uapi \
+-I$(srctree)/tools/include/uapi
+
+# Append required CFLAGS
+override CFLAGS += $(EXTRA_WARNINGS)
+override CFLAGS += -Werror -Wall
+override CFLAGS += -fPIC
+override CFLAGS += $(INCLUDES)
+override CFLAGS += -fvisibility=hidden
+override CFGLAS += -Wl,-L.
+override CFGLAS += -Wl,-lthermal
+
+all:
+
+export srctree OUTPUT CC LD CFLAGS V
+export DESTDIR DESTDIR_SQ
+
+include $(srctree)/tools/build/Makefile.include
+
+VERSION_SCRIPT := libthermal.map
+
+PATCHLEVEL    = $(LIBTHERMAL_PATCHLEVEL)
+EXTRAVERSION  = $(LIBTHERMAL_EXTRAVERSION)
+VERSION       = $(LIBTHERMAL_VERSION).$(LIBTHERMAL_PATCHLEVEL).$(LIBTHERMAL_EXTRAVERSION)
+
+LIBTHERMAL_SO := $(OUTPUT)libthermal.so.$(VERSION)
+LIBTHERMAL_A  := $(OUTPUT)libthermal.a
+LIBTHERMAL_IN := $(OUTPUT)libthermal-in.o
+LIBTHERMAL_PC := $(OUTPUT)libthermal.pc
+LIBTHERMAL_ALL := $(LIBTHERMAL_A) $(OUTPUT)libthermal.so*
+
+THERMAL_UAPI := include/uapi/linux/thermal.h
+
+$(THERMAL_UAPI): FORCE
+	ln -sf $(srctree)/$@ $(srctree)/tools/$@
+
+$(LIBTHERMAL_IN): FORCE
+	$(Q)$(MAKE) $(build)=libthermal
+
+$(LIBTHERMAL_A): $(LIBTHERMAL_IN)
+	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(LIBTHERMAL_IN)
+
+$(LIBTHERMAL_SO): $(LIBTHERMAL_IN)
+	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libthermal.so \
+                                    -Wl,--version-script=$(VERSION_SCRIPT) $^ -o $@
+	@ln -sf $(@F) $(OUTPUT)libthermal.so
+	@ln -sf $(@F) $(OUTPUT)libthermal.so.$(LIBTHERMAL_VERSION)
+
+
+libs: $(THERMAL_UAPI) $(LIBTHERMAL_A) $(LIBTHERMAL_SO) $(LIBTHERMAL_PC)
+
+all: fixdep
+	$(Q)$(MAKE) libs
+
+clean:
+	$(call QUIET_CLEAN, libthermal) $(RM) $(LIBTHERMAL_A) \
+                *.o *~ *.a *.so *.so.$(VERSION) *.so.$(LIBTHERMAL_VERSION) .*.d .*.cmd LIBTHERMAL-CFLAGS $(LIBTHERMAL_PC)
+
+$(LIBTHERMAL_PC):
+	$(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
+		-e "s|@LIBDIR@|$(libdir_SQ)|" \
+		-e "s|@VERSION@|$(VERSION)|" \
+		< libthermal.pc.template > $@
+
+define do_install_mkdir
+	if [ ! -d '$(DESTDIR_SQ)$1' ]; then             \
+		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
+	fi
+endef
+
+define do_install
+	if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
+		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
+	fi;                                             \
+	$(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
+endef
+
+install_lib: libs
+	$(call QUIET_INSTALL, $(LIBTHERMAL_ALL)) \
+		$(call do_install_mkdir,$(libdir_SQ)); \
+		cp -fpR $(LIBTHERMAL_ALL) $(DESTDIR)$(libdir_SQ)
+
+install_headers:
+	$(call QUIET_INSTALL, headers) \
+		$(call do_install,include/thermal.h,$(prefix)/include/thermal,644); \
+
+install_pkgconfig: $(LIBTHERMAL_PC)
+	$(call QUIET_INSTALL, $(LIBTHERMAL_PC)) \
+		$(call do_install,$(LIBTHERMAL_PC),$(libdir_SQ)/pkgconfig,644)
+
+install_doc:
+	$(Q)$(MAKE) -C Documentation install-man install-html install-examples
+
+install: install_lib install_headers install_pkgconfig
+
+FORCE:
+
+.PHONY: all install clean FORCE

tools/lib/thermal/commands.c

+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#define _GNU_SOURCE
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <thermal.h>
+#include "thermal_nl.h"
+
+static struct nla_policy thermal_genl_policy[THERMAL_GENL_ATTR_MAX + 1] = {
+	/* Thermal zone */
+	[THERMAL_GENL_ATTR_TZ]                  = { .type = NLA_NESTED },
+	[THERMAL_GENL_ATTR_TZ_ID]               = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_TZ_TEMP]             = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_TZ_TRIP]             = { .type = NLA_NESTED },
+	[THERMAL_GENL_ATTR_TZ_TRIP_ID]          = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_TZ_TRIP_TEMP]        = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_TZ_TRIP_TYPE]        = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_TZ_TRIP_HYST]        = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_TZ_MODE]             = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_TZ_CDEV_WEIGHT]      = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_TZ_NAME]             = { .type = NLA_STRING },
+
+	/* Governor(s) */
+	[THERMAL_GENL_ATTR_TZ_GOV]              = { .type = NLA_NESTED },
+	[THERMAL_GENL_ATTR_TZ_GOV_NAME]         = { .type = NLA_STRING },
+
+	/* Cooling devices */
+	[THERMAL_GENL_ATTR_CDEV]                = { .type = NLA_NESTED },
+	[THERMAL_GENL_ATTR_CDEV_ID]             = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_CDEV_CUR_STATE]      = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_CDEV_MAX_STATE]      = { .type = NLA_U32 },
+	[THERMAL_GENL_ATTR_CDEV_NAME]           = { .type = NLA_STRING },
+};
+
+static int parse_tz_get(struct genl_info *info, struct thermal_zone **tz)
+{
+	struct nlattr *attr;
+	struct thermal_zone *__tz = NULL;
+	size_t size = 0;
+	int rem;
+
+	nla_for_each_nested(attr, info->attrs[THERMAL_GENL_ATTR_TZ], rem) {
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_ID) {
+
+			size++;
+
+			__tz = realloc(__tz, sizeof(*__tz) * (size + 2));
+			if (!__tz)
+				return THERMAL_ERROR;
+
+			__tz[size - 1].id = nla_get_u32(attr);
+		}
+
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_NAME)
+			nla_strlcpy(__tz[size - 1].name, attr,
+				    THERMAL_NAME_LENGTH);
+	}
+
+	if (__tz)
+		__tz[size].id = -1;
+
+	*tz = __tz;
+
+	return THERMAL_SUCCESS;
+}
+
+static int parse_cdev_get(struct genl_info *info, struct thermal_cdev **cdev)
+{
+	struct nlattr *attr;
+	struct thermal_cdev *__cdev = NULL;
+	size_t size = 0;
+	int rem;
+
+	nla_for_each_nested(attr, info->attrs[THERMAL_GENL_ATTR_CDEV], rem) {
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_CDEV_ID) {
+
+			size++;
+
+			__cdev = realloc(__cdev, sizeof(*__cdev) * (size + 2));
+			if (!__cdev)
+				return THERMAL_ERROR;
+
+			__cdev[size - 1].id = nla_get_u32(attr);
+		}
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_CDEV_NAME) {
+			nla_strlcpy(__cdev[size - 1].name, attr,
+				    THERMAL_NAME_LENGTH);
+		}
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_CDEV_CUR_STATE)
+			__cdev[size - 1].cur_state = nla_get_u32(attr);
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_CDEV_MAX_STATE)
+			__cdev[size - 1].max_state = nla_get_u32(attr);
+	}
+
+	if (__cdev)
+		__cdev[size].id = -1;
+
+	*cdev = __cdev;
+
+	return THERMAL_SUCCESS;
+}
+
+static int parse_tz_get_trip(struct genl_info *info, struct thermal_zone *tz)
+{
+	struct nlattr *attr;
+	struct thermal_trip *__tt = NULL;
+	size_t size = 0;
+	int rem;
+
+	nla_for_each_nested(attr, info->attrs[THERMAL_GENL_ATTR_TZ_TRIP], rem) {
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_TRIP_ID) {
+
+			size++;
+
+			__tt = realloc(__tt, sizeof(*__tt) * (size + 2));
+			if (!__tt)
+				return THERMAL_ERROR;
+
+			__tt[size - 1].id = nla_get_u32(attr);
+		}
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_TRIP_TYPE)
+			__tt[size - 1].type = nla_get_u32(attr);
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_TRIP_TEMP)
+			__tt[size - 1].temp = nla_get_u32(attr);
+
+		if (nla_type(attr) == THERMAL_GENL_ATTR_TZ_TRIP_HYST)
+			__tt[size - 1].hyst = nla_get_u32(attr);
+	}
+
+	if (__tt)
+		__tt[size].id = -1;
+
+	tz->trip = __tt;
+
+	return THERMAL_SUCCESS;
+}
+
+static int parse_tz_get_temp(struct genl_info *info, struct thermal_zone *tz)
+{
+	int id = -1;
+
+	if (info->attrs[THERMAL_GENL_ATTR_TZ_ID])
+		id = nla_get_u32(info->attrs[THERMAL_GENL_ATTR_TZ_ID]);
+
+	if (tz->id != id)
+		return THERMAL_ERROR;
+
+	if (info->attrs[THERMAL_GENL_ATTR_TZ_TEMP])
+		tz->temp = nla_get_u32(info->attrs[THERMAL_GENL_ATTR_TZ_TEMP]);
+
+	return THERMAL_SUCCESS;
+}
+
+static int parse_tz_get_gov(struct genl_info *info, struct thermal_zone *tz)
+{
+	int id = -1;
+
+	if (info->attrs[THERMAL_GENL_ATTR_TZ_ID])
+		id = nla_get_u32(info->attrs[THERMAL_GENL_ATTR_TZ_ID]);
+
+	if (tz->id != id)
+		return THERMAL_ERROR;
+
+	if (info->attrs[THERMAL_GENL_ATTR_TZ_GOV_NAME]) {
+		nla_strlcpy(tz->governor,
+			    info->attrs[THERMAL_GENL_ATTR_TZ_GOV_NAME],
+			    THERMAL_NAME_LENGTH);
+	}
+
+	return THERMAL_SUCCESS;
+}
+
+static int handle_netlink(struct nl_cache_ops *unused,
+			  struct genl_cmd *cmd,
+			  struct genl_info *info, void *arg)
+{
+	int ret;
+
+	switch (cmd->c_id) {
+
+	case THERMAL_GENL_CMD_TZ_GET_ID:
+		ret = parse_tz_get(info, arg);
+		break;
+
+	case THERMAL_GENL_CMD_CDEV_GET:
+		ret = parse_cdev_get(info, arg);
+		break;
+
+	case THERMAL_GENL_CMD_TZ_GET_TEMP:
+		ret = parse_tz_get_temp(info, arg);
+		break;
+
+	case THERMAL_GENL_CMD_TZ_GET_TRIP:
+		ret = parse_tz_get_trip(info, arg);
+		break;
+
+	case THERMAL_GENL_CMD_TZ_GET_GOV:
+		ret = parse_tz_get_gov(info, arg);
+		break;
+
+	default:
+		return THERMAL_ERROR;
+	}
+
+	return ret;
+}
+
+static struct genl_cmd thermal_cmds[] = {
+	{
+		.c_id		= THERMAL_GENL_CMD_TZ_GET_ID,
+		.c_name		= (char *)"List thermal zones",
+		.c_msg_parser	= handle_netlink,
+		.c_maxattr	= THERMAL_GENL_ATTR_MAX,
+		.c_attr_policy	= thermal_genl_policy,
+	},
+	{
+		.c_id		= THERMAL_GENL_CMD_TZ_GET_GOV,
+		.c_name		= (char *)"Get governor",
+		.c_msg_parser	= handle_netlink,
+		.c_maxattr	= THERMAL_GENL_ATTR_MAX,
+		.c_attr_policy	= thermal_genl_policy,
+	},
+	{
+		.c_id		= THERMAL_GENL_CMD_TZ_GET_TEMP,
+		.c_name		= (char *)"Get thermal zone temperature",
+		.c_msg_parser	= handle_netlink,
+		.c_maxattr	= THERMAL_GENL_ATTR_MAX,
+		.c_attr_policy	= thermal_genl_policy,
+	},
+	{
+		.c_id		= THERMAL_GENL_CMD_TZ_GET_TRIP,
+		.c_name		= (char *)"Get thermal zone trip points",
+		.c_msg_parser	= handle_netlink,
+		.c_maxattr	= THERMAL_GENL_ATTR_MAX,
+		.c_attr_policy	= thermal_genl_policy,
+	},
+	{
+		.c_id		= THERMAL_GENL_CMD_CDEV_GET,
+		.c_name		= (char *)"Get cooling devices",
+		.c_msg_parser	= handle_netlink,
+		.c_maxattr	= THERMAL_GENL_ATTR_MAX,
+		.c_attr_policy	= thermal_genl_policy,
+	},
+};
+
+static struct genl_ops thermal_cmd_ops = {
+	.o_name		= (char *)"thermal",
+	.o_cmds		= thermal_cmds,
+	.o_ncmds	= ARRAY_SIZE(thermal_cmds),
+};
+
+static thermal_error_t thermal_genl_auto(struct thermal_handler *th, int id, int cmd,
+					 int flags, void *arg)
+{
+	struct nl_msg *msg;
+	void *hdr;
+
+	msg = nlmsg_alloc();
+	if (!msg)
+		return THERMAL_ERROR;
+
+	hdr = genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, thermal_cmd_ops.o_id,
+			  0, flags, cmd, THERMAL_GENL_VERSION);
+	if (!hdr)
+		return THERMAL_ERROR;
+
+	if (id >= 0 && nla_put_u32(msg, THERMAL_GENL_ATTR_TZ_ID, id))
+		return THERMAL_ERROR;
+
+	if (nl_send_msg(th->sk_cmd, th->cb_cmd, msg, genl_handle_msg, arg))
+		return THERMAL_ERROR;
+
+	nlmsg_free(msg);
+
+	return THERMAL_SUCCESS;
+}
+
+thermal_error_t thermal_cmd_get_tz(struct thermal_handler *th, struct thermal_zone **tz)
+{
+	return thermal_genl_auto(th, -1, THERMAL_GENL_CMD_TZ_GET_ID,
+				 NLM_F_DUMP | NLM_F_ACK, tz);
+}
+
+thermal_error_t thermal_cmd_get_cdev(struct thermal_handler *th, struct thermal_cdev **tc)
+{
+	return thermal_genl_auto(th, -1, THERMAL_GENL_CMD_CDEV_GET,
+				 NLM_F_DUMP | NLM_F_ACK, tc);
+}
+
+thermal_error_t thermal_cmd_get_trip(struct thermal_handler *th, struct thermal_zone *tz)
+{
+	return thermal_genl_auto(th, tz->id, THERMAL_GENL_CMD_TZ_GET_TRIP,
+				 0, tz);
+}
+
+thermal_error_t thermal_cmd_get_governor(struct thermal_handler *th, struct thermal_zone *tz)
+{
+	return thermal_genl_auto(th, tz->id, THERMAL_GENL_CMD_TZ_GET_GOV, 0, tz);
+}
+
+thermal_error_t thermal_cmd_get_temp(struct thermal_handler *th, struct thermal_zone *tz)
+{
+	return thermal_genl_auto(th, tz->id, THERMAL_GENL_CMD_TZ_GET_TEMP, 0, tz);
+}
+
+thermal_error_t thermal_cmd_exit(struct thermal_handler *th)
+{
+	if (genl_unregister_family(&thermal_cmd_ops))
+		return THERMAL_ERROR;
+
+	nl_thermal_disconnect(th->sk_cmd, th->cb_cmd);
+
+	return THERMAL_SUCCESS;
+}
+
+thermal_error_t thermal_cmd_init(struct thermal_handler *th)
+{
+	int ret;
+	int family;
+
+	if (nl_thermal_connect(&th->sk_cmd, &th->cb_cmd))
+		return THERMAL_ERROR;
+
+	ret = genl_register_family(&thermal_cmd_ops);
+	if (ret)
+		return THERMAL_ERROR;
+
+	ret = genl_ops_resolve(th->sk_cmd, &thermal_cmd_ops);
+	if (ret)
+		return THERMAL_ERROR;
+
+	family = genl_ctrl_resolve(th->sk_cmd, "nlctrl");
+	if (family != GENL_ID_CTRL)
+		return THERMAL_ERROR;
+
+	return THERMAL_SUCCESS;
+}

tools/lib/thermal/events.c

+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <linux/netlink.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+
+#include <thermal.h>
+#include "thermal_nl.h"
+
+/*
+ * Optimization: fill this array to tell which event we do want to pay
+ * attention to. That happens at init time with the ops
+ * structure. Each ops will enable the event and the general handler
+ * will be able to discard the event if there is not ops associated
+ * with it.
+ */
+static int enabled_ops[__THERMAL_GENL_EVENT_MAX];
+
+static int handle_thermal_event(struct nl_msg *n, void *arg)
+{
+	struct nlmsghdr *nlh = nlmsg_hdr(n);
+	struct genlmsghdr *genlhdr = genlmsg_hdr(nlh);
+	struct nlattr *attrs[THERMAL_GENL_ATTR_MAX + 1];
+	struct thermal_handler_param *thp = arg;
+	struct thermal_events_ops *ops = &thp->th->ops->events;
+
+	genlmsg_parse(nlh, 0, attrs, THERMAL_GENL_ATTR_MAX, NULL);
+
+	arg = thp->arg;
+
+	/*
+	 * This is an event we don't care of, bail out.
+	 */
+	if (!enabled_ops[genlhdr->cmd])
+		return THERMAL_SUCCESS;
+
+	switch (genlhdr->cmd) {
+
+	case THERMAL_GENL_EVENT_TZ_CREATE:
+		return ops->tz_create(nla_get_string(attrs[THERMAL_GENL_ATTR_TZ_NAME]),
+				      nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]), arg);
+
+	case THERMAL_GENL_EVENT_TZ_DELETE:
+		return ops->tz_delete(nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]), arg);
+
+	case THERMAL_GENL_EVENT_TZ_ENABLE:
+		return ops->tz_enable(nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]), arg);
+
+	case THERMAL_GENL_EVENT_TZ_DISABLE:
+		return ops->tz_disable(nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]), arg);
+
+	case THERMAL_GENL_EVENT_TZ_TRIP_CHANGE:
+		return ops->trip_change(nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]),
+					nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_ID]),
+					nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_TYPE]),
+					nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_TEMP]),
+					nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_HYST]), arg);
+
+	case THERMAL_GENL_EVENT_TZ_TRIP_ADD:
+		return ops->trip_add(nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]),
+				     nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_ID]),
+				     nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_TYPE]),
+				     nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_TEMP]),
+				     nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_HYST]), arg);
+
+	case THERMAL_GENL_EVENT_TZ_TRIP_DELETE:
+		return ops->trip_delete(nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]),
+					nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_ID]), arg);
+
+	case THERMAL_GENL_EVENT_TZ_TRIP_UP:
+		return ops->trip_high(nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]),
+				      nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_ID]),
+				      nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TEMP]), arg);
+
+	case THERMAL_GENL_EVENT_TZ_TRIP_DOWN:
+		return ops->trip_low(nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]),
+				     nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TRIP_ID]),
+				     nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TEMP]), arg);
+
+	case THERMAL_GENL_EVENT_CDEV_ADD:
+		return ops->cdev_add(nla_get_string(attrs[THERMAL_GENL_ATTR_CDEV_NAME]),
+				     nla_get_u32(attrs[THERMAL_GENL_ATTR_CDEV_ID]),
+				     nla_get_u32(attrs[THERMAL_GENL_ATTR_CDEV_MAX_STATE]), arg);
+
+	case THERMAL_GENL_EVENT_CDEV_DELETE:
+		return ops->cdev_delete(nla_get_u32(attrs[THERMAL_GENL_ATTR_CDEV_ID]), arg);
+
+	case THERMAL_GENL_EVENT_CDEV_STATE_UPDATE:
+		return ops->cdev_update(nla_get_u32(attrs[THERMAL_GENL_ATTR_CDEV_ID]),
+					nla_get_u32(attrs[THERMAL_GENL_ATTR_CDEV_CUR_STATE]), arg);
+
+	case THERMAL_GENL_EVENT_TZ_GOV_CHANGE:
+		return ops->gov_change(nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]),
+				       nla_get_string(attrs[THERMAL_GENL_ATTR_GOV_NAME]), arg);
+	default:
+		return -1;
+	}
+}
+
+static void thermal_events_ops_init(struct thermal_events_ops *ops)
+{
+	enabled_ops[THERMAL_GENL_EVENT_TZ_CREATE]	= !!ops->tz_create;
+	enabled_ops[THERMAL_GENL_EVENT_TZ_DELETE]	= !!ops->tz_delete;
+	enabled_ops[THERMAL_GENL_EVENT_TZ_DISABLE]	= !!ops->tz_disable;
+	enabled_ops[THERMAL_GENL_EVENT_TZ_ENABLE]	= !!ops->tz_enable;
+	enabled_ops[THERMAL_GENL_EVENT_TZ_TRIP_UP]	= !!ops->trip_high;
+	enabled_ops[THERMAL_GENL_EVENT_TZ_TRIP_DOWN]	= !!ops->trip_low;
+	enabled_ops[THERMAL_GENL_EVENT_TZ_TRIP_CHANGE]	= !!ops->trip_change;
+	enabled_ops[THERMAL_GENL_EVENT_TZ_TRIP_ADD]	= !!ops->trip_add;
+	enabled_ops[THERMAL_GENL_EVENT_TZ_TRIP_DELETE]	= !!ops->trip_delete;
+	enabled_ops[THERMAL_GENL_EVENT_CDEV_ADD]	= !!ops->cdev_add;
+	enabled_ops[THERMAL_GENL_EVENT_CDEV_DELETE]	= !!ops->cdev_delete;
+	enabled_ops[THERMAL_GENL_EVENT_CDEV_STATE_UPDATE] = !!ops->cdev_update;
+	enabled_ops[THERMAL_GENL_EVENT_TZ_GOV_CHANGE]	= !!ops->gov_change;
+}
+
+thermal_error_t thermal_events_handle(struct thermal_handler *th, void *arg)
+{
+	struct thermal_handler_param thp = { .th = th, .arg = arg };
+
+	if (!th)
+		return THERMAL_ERROR;
+
+	if (nl_cb_set(th->cb_event, NL_CB_VALID, NL_CB_CUSTOM,
+		      handle_thermal_event, &thp))
+		return THERMAL_ERROR;
+
+	return nl_recvmsgs(th->sk_event, th->cb_event);
+}
+
+int thermal_events_fd(struct thermal_handler *th)
+{
+	if (!th)
+		return -1;
+
+	return nl_socket_get_fd(th->sk_event);
+}
+
+thermal_error_t thermal_events_exit(struct thermal_handler *th)
+{
+	if (nl_unsubscribe_thermal(th->sk_event, th->cb_event,
+				   THERMAL_GENL_EVENT_GROUP_NAME))
+		return THERMAL_ERROR;
+
+	nl_thermal_disconnect(th->sk_event, th->cb_event);
+
+	return THERMAL_SUCCESS;
+}
+
+thermal_error_t thermal_events_init(struct thermal_handler *th)
+{
+	thermal_events_ops_init(&th->ops->events);
+
+	if (nl_thermal_connect(&th->sk_event, &th->cb_event))
+		return THERMAL_ERROR;
+
+	if (nl_subscribe_thermal(th->sk_event, th->cb_event,
+				 THERMAL_GENL_EVENT_GROUP_NAME))
+		return THERMAL_ERROR;
+
+	return THERMAL_SUCCESS;
+}

tools/lib/thermal/include/thermal.h

+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __LIBTHERMAL_H
+#define __LIBTHERMAL_H
+
+#include <linux/thermal.h>
+
+#ifndef LIBTHERMAL_API
+#define LIBTHERMAL_API __attribute__((visibility("default")))
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct thermal_sampling_ops {
+	int (*tz_temp)(int tz_id, int temp, void *arg);
+};
+
+struct thermal_events_ops {
+	int (*tz_create)(const char *name, int tz_id, void *arg);
+	int (*tz_delete)(int tz_id, void *arg);
+	int (*tz_enable)(int tz_id, void *arg);
+	int (*tz_disable)(int tz_id, void *arg);
+	int (*trip_high)(int tz_id, int trip_id, int temp, void *arg);
+	int (*trip_low)(int tz_id, int trip_id, int temp, void *arg);
+	int (*trip_add)(int tz_id, int trip_id, int type, int temp, int hyst, void *arg);
+	int (*trip_change)(int tz_id, int trip_id, int type, int temp, int hyst, void *arg);
+	int (*trip_delete)(int tz_id, int trip_id, void *arg);
+	int (*cdev_add)(const char *name, int cdev_id, int max_state, void *arg);
+	int (*cdev_delete)(int cdev_id, void *arg);
+	int (*cdev_update)(int cdev_id, int cur_state, void *arg);
+	int (*gov_change)(int tz_id, const char *gov_name, void *arg);
+};
+
+struct thermal_ops {
+	struct thermal_sampling_ops sampling;
+	struct thermal_events_ops events;
+};
+
+struct thermal_trip {
+	int id;
+	int type;
+	int temp;
+	int hyst;
+};
+
+struct thermal_zone {
+	int id;
+	int temp;
+	char name[THERMAL_NAME_LENGTH];
+	char governor[THERMAL_NAME_LENGTH];
+	struct thermal_trip *trip;
+};
+
+struct thermal_cdev {
+	int id;
+	char name[THERMAL_NAME_LENGTH];
+	int max_state;
+	int min_state;
+	int cur_state;
+};
+
+typedef enum {
+	THERMAL_ERROR = -1,
+	THERMAL_SUCCESS = 0,
+} thermal_error_t;
+
+struct thermal_handler;
+
+typedef int (*cb_tz_t)(struct thermal_zone *, void *);
+
+typedef int (*cb_tt_t)(struct thermal_trip *, void *);
+
+typedef int (*cb_tc_t)(struct thermal_cdev *, void *);
+
+LIBTHERMAL_API int for_each_thermal_zone(struct thermal_zone *tz, cb_tz_t cb, void *arg);
+
+LIBTHERMAL_API int for_each_thermal_trip(struct thermal_trip *tt, cb_tt_t cb, void *arg);
+
+LIBTHERMAL_API int for_each_thermal_cdev(struct thermal_cdev *cdev, cb_tc_t cb, void *arg);
+
+LIBTHERMAL_API struct thermal_zone *thermal_zone_find_by_name(struct thermal_zone *tz,
+							      const char *name);
+
+LIBTHERMAL_API struct thermal_zone *thermal_zone_find_by_id(struct thermal_zone *tz, int id);
+
+LIBTHERMAL_API struct thermal_zone *thermal_zone_discover(struct thermal_handler *th);
+
+LIBTHERMAL_API struct thermal_handler *thermal_init(struct thermal_ops *ops);
+
+LIBTHERMAL_API void thermal_exit(struct thermal_handler *th);
+
+/*
+ * Netlink thermal events
+ */
+LIBTHERMAL_API thermal_error_t thermal_events_exit(struct thermal_handler *th);
+
+LIBTHERMAL_API thermal_error_t thermal_events_init(struct thermal_handler *th);
+
+LIBTHERMAL_API thermal_error_t thermal_events_handle(struct thermal_handler *th, void *arg);
+
+LIBTHERMAL_API int thermal_events_fd(struct thermal_handler *th);
+
+/*
+ * Netlink thermal commands
+ */
+LIBTHERMAL_API thermal_error_t thermal_cmd_exit(struct thermal_handler *th);
+
+LIBTHERMAL_API thermal_error_t thermal_cmd_init(struct thermal_handler *th);
+
+LIBTHERMAL_API thermal_error_t thermal_cmd_get_tz(struct thermal_handler *th,
+						  struct thermal_zone **tz);
+
+LIBTHERMAL_API thermal_error_t thermal_cmd_get_cdev(struct thermal_handler *th,
+						    struct thermal_cdev **tc);
+
+LIBTHERMAL_API thermal_error_t thermal_cmd_get_trip(struct thermal_handler *th,
+						    struct thermal_zone *tz);
+
+LIBTHERMAL_API thermal_error_t thermal_cmd_get_governor(struct thermal_handler *th,
+							struct thermal_zone *tz);
+
+LIBTHERMAL_API thermal_error_t thermal_cmd_get_temp(struct thermal_handler *th,
+						    struct thermal_zone *tz);
+
+/*
+ * Netlink thermal samples
+ */
+LIBTHERMAL_API thermal_error_t thermal_sampling_exit(struct thermal_handler *th);
+
+LIBTHERMAL_API thermal_error_t thermal_sampling_init(struct thermal_handler *th);
+
+LIBTHERMAL_API thermal_error_t thermal_sampling_handle(struct thermal_handler *th, void *arg);
+
+LIBTHERMAL_API int thermal_sampling_fd(struct thermal_handler *th);
+
+#endif /* __LIBTHERMAL_H */
+
+#ifdef __cplusplus
+}
+#endif

tools/lib/thermal/libthermal.map

+LIBTHERMAL_0.0.1 {
+	global:
+		thermal_init;
+		for_each_thermal_zone;
+		for_each_thermal_trip;
+		for_each_thermal_cdev;
+		thermal_zone_find_by_name;
+		thermal_zone_find_by_id;
+		thermal_zone_discover;
+		thermal_init;
+		thermal_events_init;
+		thermal_events_handle;
+		thermal_events_fd;
+		thermal_cmd_init;
+		thermal_cmd_get_tz;
+		thermal_cmd_get_cdev;
+		thermal_cmd_get_trip;
+		thermal_cmd_get_governor;
+		thermal_cmd_get_temp;
+		thermal_sampling_init;
+		thermal_sampling_handle;
+		thermal_sampling_fd;
+local:
+		*;
+};

tools/lib/thermal/libthermal.pc.template

+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+
+prefix=@PREFIX@
+libdir=@LIBDIR@
+includedir=${prefix}/include
+
+Name: libthermal
+Description: thermal library
+Requires: libnl-3.0 libnl-genl-3.0
+Version: @VERSION@
+Libs: -L${libdir} -lnl-genl-3 -lnl-3
+Cflags: -I${includedir} -I{include}/libnl3

tools/lib/thermal/sampling.c

+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <thermal.h>
+#include "thermal_nl.h"
+
+static int handle_thermal_sample(struct nl_msg *n, void *arg)
+{
+	struct nlmsghdr *nlh = nlmsg_hdr(n);
+	struct genlmsghdr *genlhdr = genlmsg_hdr(nlh);
+	struct nlattr *attrs[THERMAL_GENL_ATTR_MAX + 1];
+	struct thermal_handler_param *thp = arg;
+	struct thermal_handler *th = thp->th;
+
+	genlmsg_parse(nlh, 0, attrs, THERMAL_GENL_ATTR_MAX, NULL);
+
+	switch (genlhdr->cmd) {
+
+	case THERMAL_GENL_SAMPLING_TEMP:
+		return th->ops->sampling.tz_temp(
+			nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_ID]),
+			nla_get_u32(attrs[THERMAL_GENL_ATTR_TZ_TEMP]), arg);
+	default:
+		return THERMAL_ERROR;
+	}
+}
+
+thermal_error_t thermal_sampling_handle(struct thermal_handler *th, void *arg)
+{
+	struct thermal_handler_param thp = { .th = th, .arg = arg };
+
+	if (!th)
+		return THERMAL_ERROR;
+
+	if (nl_cb_set(th->cb_sampling, NL_CB_VALID, NL_CB_CUSTOM,
+		      handle_thermal_sample, &thp))
+		return THERMAL_ERROR;
+
+	return nl_recvmsgs(th->sk_sampling, th->cb_sampling);
+}
+
+int thermal_sampling_fd(struct thermal_handler *th)
+{
+	if (!th)
+		return -1;
+
+	return nl_socket_get_fd(th->sk_sampling);
+}
+
+thermal_error_t thermal_sampling_exit(struct thermal_handler *th)
+{
+	if (nl_unsubscribe_thermal(th->sk_sampling, th->cb_sampling,
+				   THERMAL_GENL_EVENT_GROUP_NAME))
+		return THERMAL_ERROR;
+
+	nl_thermal_disconnect(th->sk_sampling, th->cb_sampling);
+
+	return THERMAL_SUCCESS;
+}
+
+thermal_error_t thermal_sampling_init(struct thermal_handler *th)
+{
+	if (nl_thermal_connect(&th->sk_sampling, &th->cb_sampling))
+		return THERMAL_ERROR;
+
+	if (nl_subscribe_thermal(th->sk_sampling, th->cb_sampling,
+				 THERMAL_GENL_SAMPLING_GROUP_NAME))
+		return THERMAL_ERROR;
+
+	return THERMAL_SUCCESS;
+}

tools/lib/thermal/thermal.c

+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <stdio.h>
+#include <thermal.h>
+
+#include "thermal_nl.h"
+
+int for_each_thermal_cdev(struct thermal_cdev *cdev, cb_tc_t cb, void *arg)
+{
+	int i, ret = 0;
+
+	if (!cdev)
+		return 0;
+
+	for (i = 0; cdev[i].id != -1; i++)
+		ret |= cb(&cdev[i], arg);
+
+	return ret;
+}
+
+int for_each_thermal_trip(struct thermal_trip *tt, cb_tt_t cb, void *arg)
+{
+	int i, ret = 0;
+
+	if (!tt)
+		return 0;
+
+	for (i = 0; tt[i].id != -1; i++)
+		ret |= cb(&tt[i], arg);
+
+	return ret;
+}
+
+int for_each_thermal_zone(struct thermal_zone *tz, cb_tz_t cb, void *arg)
+{
+	int i, ret = 0;
+
+	if (!tz)
+		return 0;
+
+	for (i = 0; tz[i].id != -1; i++)
+		ret |= cb(&tz[i], arg);
+
+	return ret;
+}
+
+struct thermal_zone *thermal_zone_find_by_name(struct thermal_zone *tz,
+					       const char *name)
+{
+	int i;
+
+	if (!tz || !name)
+		return NULL;
+
+	for (i = 0; tz[i].id != -1; i++) {
+		if (!strcmp(tz[i].name, name))
+			return &tz[i];
+	}
+
+	return NULL;
+}
+
+struct thermal_zone *thermal_zone_find_by_id(struct thermal_zone *tz, int id)
+{
+	int i;
+
+	if (!tz || id < 0)
+		return NULL;
+
+	for (i = 0; tz[i].id != -1; i++) {
+		if (tz[i].id == id)
+			return &tz[i];
+	}
+
+	return NULL;
+}
+
+static int __thermal_zone_discover(struct thermal_zone *tz, void *th)
+{
+	if (thermal_cmd_get_trip(th, tz) < 0)
+		return -1;
+
+	if (thermal_cmd_get_governor(th, tz))
+		return -1;
+
+	return 0;
+}
+
+struct thermal_zone *thermal_zone_discover(struct thermal_handler *th)
+{
+	struct thermal_zone *tz;
+
+	if (thermal_cmd_get_tz(th, &tz) < 0)
+		return NULL;
+
+	if (for_each_thermal_zone(tz, __thermal_zone_discover, th))
+		return NULL;
+
+	return tz;
+}
+
+void thermal_exit(struct thermal_handler *th)
+{
+	thermal_cmd_exit(th);
+	thermal_events_exit(th);
+	thermal_sampling_exit(th);
+
+	free(th);
+}
+
+struct thermal_handler *thermal_init(struct thermal_ops *ops)
+{
+	struct thermal_handler *th;
+
+	th = malloc(sizeof(*th));
+	if (!th)
+		return NULL;
+	th->ops = ops;
+
+	if (thermal_events_init(th))
+		goto out_free;
+
+	if (thermal_sampling_init(th))
+		goto out_free;
+
+	if (thermal_cmd_init(th))
+		goto out_free;
+
+	return th;
+
+out_free:
+	free(th);
+
+	return NULL;
+}

tools/lib/thermal/thermal_nl.c

+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <thermal.h>
+#include "thermal_nl.h"
+
+struct handler_args {
+	const char *group;
+	int id;
+};
+
+static __thread int err;
+static __thread int done;
+
+static int nl_seq_check_handler(struct nl_msg *msg, void *arg)
+{
+	return NL_OK;
+}
+
+static int nl_error_handler(struct sockaddr_nl *nla, struct nlmsgerr *nl_err,
+			    void *arg)
+{
+	int *ret = arg;
+
+	if (ret)
+		*ret = nl_err->error;
+
+	return NL_STOP;
+}
+
+static int nl_finish_handler(struct nl_msg *msg, void *arg)
+{
+	int *ret = arg;
+
+	if (ret)
+		*ret = 1;
+
+	return NL_OK;
+}
+
+static int nl_ack_handler(struct nl_msg *msg, void *arg)
+{
+	int *ret = arg;
+
+	if (ret)
+		*ret = 1;
+
+	return NL_OK;
+}
+
+int nl_send_msg(struct nl_sock *sock, struct nl_cb *cb, struct nl_msg *msg,
+		int (*rx_handler)(struct nl_msg *, void *), void *data)
+{
+	if (!rx_handler)
+		return THERMAL_ERROR;
+
+	err = nl_send_auto_complete(sock, msg);
+	if (err < 0)
+		return err;
+
+	nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, rx_handler, data);
+
+	err = done = 0;
+
+	while (err == 0 && done == 0)
+		nl_recvmsgs(sock, cb);
+
+	return err;
+}
+
+static int nl_family_handler(struct nl_msg *msg, void *arg)
+{
+	struct handler_args *grp = arg;
+	struct nlattr *tb[CTRL_ATTR_MAX + 1];
+	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+	struct nlattr *mcgrp;
+	int rem_mcgrp;
+
+	nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
+		  genlmsg_attrlen(gnlh, 0), NULL);
+
+	if (!tb[CTRL_ATTR_MCAST_GROUPS])
+		return THERMAL_ERROR;
+
+	nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], rem_mcgrp) {
+
+		struct nlattr *tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1];
+
+		nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX,
+			  nla_data(mcgrp), nla_len(mcgrp), NULL);
+
+		if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME] ||
+		    !tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID])
+			continue;
+
+		if (strncmp(nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]),
+			    grp->group,
+			    nla_len(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME])))
+			continue;
+
+		grp->id = nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]);
+
+		break;
+	}
+
+	return THERMAL_SUCCESS;
+}
+
+static int nl_get_multicast_id(struct nl_sock *sock, struct nl_cb *cb,
+			       const char *family, const char *group)
+{
+	struct nl_msg *msg;
+	int ret = 0, ctrlid;
+	struct handler_args grp = {
+		.group = group,
+		.id = -ENOENT,
+	};
+
+	msg = nlmsg_alloc();
+	if (!msg)
+		return THERMAL_ERROR;
+
+	ctrlid = genl_ctrl_resolve(sock, "nlctrl");
+
+	genlmsg_put(msg, 0, 0, ctrlid, 0, 0, CTRL_CMD_GETFAMILY, 0);
+
+	nla_put_string(msg, CTRL_ATTR_FAMILY_NAME, family);
+
+	ret = nl_send_msg(sock, cb, msg, nl_family_handler, &grp);
+	if (ret)
+		goto nla_put_failure;
+
+	ret = grp.id;
+
+nla_put_failure:
+	nlmsg_free(msg);
+	return ret;
+}
+
+int nl_thermal_connect(struct nl_sock **nl_sock, struct nl_cb **nl_cb)
+{
+	struct nl_cb *cb;
+	struct nl_sock *sock;
+
+	cb = nl_cb_alloc(NL_CB_DEFAULT);
+	if (!cb)
+		return THERMAL_ERROR;
+
+	sock = nl_socket_alloc();
+	if (!sock)
+		goto out_cb_free;
+
+	if (genl_connect(sock))
+		goto out_socket_free;
+
+	if (nl_cb_err(cb, NL_CB_CUSTOM, nl_error_handler, &err) ||
+	    nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, nl_finish_handler, &done) ||
+	    nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, nl_ack_handler, &done) ||
+	    nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl_seq_check_handler, &done))
+		return THERMAL_ERROR;
+
+	*nl_sock = sock;
+	*nl_cb = cb;
+
+	return THERMAL_SUCCESS;
+
+out_socket_free:
+	nl_socket_free(sock);
+out_cb_free:
+	nl_cb_put(cb);
+	return THERMAL_ERROR;
+}
+
+void nl_thermal_disconnect(struct nl_sock *nl_sock, struct nl_cb *nl_cb)
+{
+	nl_close(nl_sock);
+	nl_socket_free(nl_sock);
+	nl_cb_put(nl_cb);
+}
+
+int nl_unsubscribe_thermal(struct nl_sock *nl_sock, struct nl_cb *nl_cb,
+			   const char *group)
+{
+	int mcid;
+
+	mcid = nl_get_multicast_id(nl_sock, nl_cb, THERMAL_GENL_FAMILY_NAME,
+				   group);
+	if (mcid < 0)
+		return THERMAL_ERROR;
+
+	if (nl_socket_drop_membership(nl_sock, mcid))
+		return THERMAL_ERROR;
+
+	return THERMAL_SUCCESS;
+}
+
+int nl_subscribe_thermal(struct nl_sock *nl_sock, struct nl_cb *nl_cb,
+			 const char *group)
+{
+	int mcid;
+
+	mcid = nl_get_multicast_id(nl_sock, nl_cb, THERMAL_GENL_FAMILY_NAME,
+				   group);
+	if (mcid < 0)
+		return THERMAL_ERROR;
+
+	if (nl_socket_add_membership(nl_sock, mcid))
+		return THERMAL_ERROR;
+
+	return THERMAL_SUCCESS;
+}

tools/lib/thermal/thermal_nl.h

+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __THERMAL_H
+#define __THERMAL_H
+
+#include <netlink/netlink.h>
+#include <netlink/genl/genl.h>
+#include <netlink/genl/mngt.h>
+#include <netlink/genl/ctrl.h>
+
+struct thermal_handler {
+	int done;
+	int error;
+	struct thermal_ops *ops;
+	struct nl_msg *msg;
+	struct nl_sock *sk_event;
+	struct nl_sock *sk_sampling;
+	struct nl_sock *sk_cmd;
+	struct nl_cb *cb_cmd;
+	struct nl_cb *cb_event;
+	struct nl_cb *cb_sampling;
+};
+
+struct thermal_handler_param {
+	struct thermal_handler *th;
+	void *arg;
+};
+
+/*
+ * Low level netlink
+ */
+extern int nl_subscribe_thermal(struct nl_sock *nl_sock, struct nl_cb *nl_cb,
+				const char *group);
+
+extern int nl_unsubscribe_thermal(struct nl_sock *nl_sock, struct nl_cb *nl_cb,
+				  const char *group);
+
+extern int nl_thermal_connect(struct nl_sock **nl_sock, struct nl_cb **nl_cb);
+
+extern void nl_thermal_disconnect(struct nl_sock *nl_sock, struct nl_cb *nl_cb);
+
+extern int nl_send_msg(struct nl_sock *sock, struct nl_cb *nl_cb, struct nl_msg *msg,
+		       int (*rx_handler)(struct nl_msg *, void *),
+		       void *data);
+
+#endif /* __THERMAL_H */

tools/thermal/lib/Build

+libthermal_tools-y += mainloop.o
+libthermal_tools-y += log.o
+libthermal_tools-y += uptimeofday.o

tools/thermal/lib/Makefile

+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+# Most of this file is copied from tools/lib/perf/Makefile
+
+LIBTHERMAL_TOOLS_VERSION = 0
+LIBTHERMAL_TOOLS_PATCHLEVEL = 0
+LIBTHERMAL_TOOLS_EXTRAVERSION = 1
+
+MAKEFLAGS += --no-print-directory
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+# $(info Determined 'srctree' to be $(srctree))
+endif
+
+INSTALL = install
+
+# Use DESTDIR for installing into a different root directory.
+# This is useful for building a package. The program will be
+# installed in this directory as if it was the root directory.
+# Then the build tool can move it later.
+DESTDIR ?=
+DESTDIR_SQ = '$(subst ','\'',$(DESTDIR))'
+
+include $(srctree)/tools/scripts/Makefile.include
+include $(srctree)/tools/scripts/Makefile.arch
+
+ifeq ($(LP64), 1)
+  libdir_relative = lib64
+else
+  libdir_relative = lib
+endif
+
+prefix ?=
+libdir = $(prefix)/$(libdir_relative)
+
+# Shell quotes
+libdir_SQ = $(subst ','\'',$(libdir))
+libdir_relative_SQ = $(subst ','\'',$(libdir_relative))
+
+ifeq ("$(origin V)", "command line")
+  VERBOSE = $(V)
+endif
+ifndef VERBOSE
+  VERBOSE = 0
+endif
+
+ifeq ($(VERBOSE),1)
+  Q =
+else
+  Q = @
+endif
+
+# Set compile option CFLAGS
+ifdef EXTRA_CFLAGS
+  CFLAGS := $(EXTRA_CFLAGS)
+else
+  CFLAGS := -g -Wall
+endif
+
+INCLUDES = \
+-I/usr/include/libnl3 \
+-I$(srctree)/tools/lib/thermal/include \
+-I$(srctree)/tools/lib/ \
+-I$(srctree)/tools/include \
+-I$(srctree)/tools/arch/$(SRCARCH)/include/ \
+-I$(srctree)/tools/arch/$(SRCARCH)/include/uapi \
+-I$(srctree)/tools/include/uapi
+
+# Append required CFLAGS
+override CFLAGS += $(EXTRA_WARNINGS)
+override CFLAGS += -Werror -Wall
+override CFLAGS += -fPIC
+override CFLAGS += $(INCLUDES)
+override CFGLAS += -Wl,-L.
+override CFGLAS += -Wl,-lthermal
+
+all:
+
+export srctree OUTPUT CC LD CFLAGS V
+export DESTDIR DESTDIR_SQ
+
+include $(srctree)/tools/build/Makefile.include
+
+PATCHLEVEL    = $(LIBTHERMAL_TOOLS_PATCHLEVEL)
+EXTRAVERSION  = $(LIBTHERMAL_TOOLS_EXTRAVERSION)
+VERSION       = $(LIBTHERMAL_TOOLS_VERSION).$(LIBTHERMAL_TOOLS_PATCHLEVEL).$(LIBTHERMAL_TOOLS_EXTRAVERSION)
+
+LIBTHERMAL_TOOLS_SO := $(OUTPUT)libthermal_tools.so.$(VERSION)
+LIBTHERMAL_TOOLS_A  := $(OUTPUT)libthermal_tools.a
+LIBTHERMAL_TOOLS_IN := $(OUTPUT)libthermal_tools-in.o
+LIBTHERMAL_TOOLS_PC := $(OUTPUT)libthermal_tools.pc
+
+LIBTHERMAL_TOOLS_ALL := $(LIBTHERMAL_TOOLS_A) $(OUTPUT)libthermal_tools.so*
+
+$(LIBTHERMAL_TOOLS_IN): FORCE
+	$(Q)$(MAKE) $(build)=libthermal_tools
+
+$(LIBTHERMAL_TOOLS_A): $(LIBTHERMAL_TOOLS_IN)
+	$(QUIET_AR)$(RM) $@ && $(AR) rcs $@ $(LIBTHERMAL_TOOLS_IN)
+
+$(LIBTHERMAL_TOOLS_SO): $(LIBTHERMAL_TOOLS_IN)
+	$(QUIET_LINK)$(CC) --shared -Wl,-soname,libthermal_tools.so $^ -o $@
+	@ln -sf $(@F) $(OUTPUT)libthermal_tools.so
+	@ln -sf $(@F) $(OUTPUT)libthermal_tools.so.$(LIBTHERMAL_TOOLS_VERSION)
+
+
+libs: $(LIBTHERMAL_TOOLS_A) $(LIBTHERMAL_TOOLS_SO) $(LIBTHERMAL_TOOLS_PC)
+
+all: fixdep
+	$(Q)$(MAKE) libs
+
+clean:
+	$(call QUIET_CLEAN, libthermal_tools) $(RM) $(LIBTHERMAL_TOOLS_A) \
+                *.o *~ *.a *.so *.so.$(VERSION) *.so.$(LIBTHERMAL_TOOLS_VERSION) .*.d .*.cmd LIBTHERMAL_TOOLS-CFLAGS $(LIBTHERMAL_TOOLS_PC)
+
+$(LIBTHERMAL_TOOLS_PC):
+	$(QUIET_GEN)sed -e "s|@PREFIX@|$(prefix)|" \
+		-e "s|@LIBDIR@|$(libdir_SQ)|" \
+		-e "s|@VERSION@|$(VERSION)|" \
+		< libthermal_tools.pc.template > $@
+
+define do_install_mkdir
+	if [ ! -d '$(DESTDIR_SQ)$1' ]; then             \
+		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$1'; \
+	fi
+endef
+
+define do_install
+	if [ ! -d '$(DESTDIR_SQ)$2' ]; then             \
+		$(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \
+	fi;                                             \
+	$(INSTALL) $1 $(if $3,-m $3,) '$(DESTDIR_SQ)$2'
+endef
+
+install_lib: libs
+	$(call QUIET_INSTALL, $(LIBTHERMAL_TOOLS_ALL)) \
+		$(call do_install_mkdir,$(libdir_SQ)); \
+		cp -fpR $(LIBTHERMAL_TOOLS_ALL) $(DESTDIR)$(libdir_SQ)
+
+install_headers:
+	$(call QUIET_INSTALL, headers) \
+		$(call do_install,include/thermal.h,$(prefix)/include/thermal,644); \
+
+install_pkgconfig: $(LIBTHERMAL_TOOLS_PC)
+	$(call QUIET_INSTALL, $(LIBTHERMAL_TOOLS_PC)) \
+		$(call do_install,$(LIBTHERMAL_TOOLS_PC),$(libdir_SQ)/pkgconfig,644)
+
+install_doc:
+	$(Q)$(MAKE) -C Documentation install-man install-html install-examples
+
+#install: install_lib install_headers install_pkgconfig install_doc
+install: install_lib install_headers install_pkgconfig
+
+FORCE:
+
+.PHONY: all install clean FORCE

tools/thermal/lib/libthermal_tools.pc.template

+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+
+prefix=@PREFIX@
+libdir=@LIBDIR@
+includedir=${prefix}/include
+
+Name: libthermal
+Description: thermal library
+Requires: libnl-3.0 libnl-genl-3.0
+Version: @VERSION@
+Libs: -L${libdir} -lnl-genl-3 -lnl-3
+Cflags: -I${includedir} -I{include}/libnl3

tools/thermal/lib/log.c

+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+#include "log.h"
+
+static const char *__ident = "unknown";
+static int __options;
+
+static const char * const loglvl[] = {
+	[LOG_DEBUG]	= "DEBUG",
+	[LOG_INFO]	= "INFO",
+	[LOG_NOTICE]	= "NOTICE",
+	[LOG_WARNING]	= "WARN",
+	[LOG_ERR]	= "ERROR",
+	[LOG_CRIT]	= "CRITICAL",
+	[LOG_ALERT]	= "ALERT",
+	[LOG_EMERG]	= "EMERG",
+};
+
+int log_str2level(const char *lvl)
+{
+	int i;
+
+	for (i = 0; i < sizeof(loglvl) / sizeof(loglvl[LOG_DEBUG]); i++)
+		if (!strcmp(lvl, loglvl[i]))
+			return i;
+
+	return LOG_DEBUG;
+}
+
+extern void logit(int level, const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+
+	if (__options & TO_SYSLOG)
+		vsyslog(level, format, args);
+
+	if (__options & TO_STDERR)
+		vfprintf(stderr, format, args);
+
+	if (__options & TO_STDOUT)
+		vfprintf(stdout, format, args);
+
+	va_end(args);
+}
+
+int log_init(int level, const char *ident, int options)
+{
+	if (!options)
+		return -1;
+
+	if (level > LOG_DEBUG)
+		return -1;
+
+	if (!ident)
+		return -1;
+
+	__ident = ident;
+	__options = options;
+
+	if (options & TO_SYSLOG) {
+		openlog(__ident, options | LOG_NDELAY, LOG_USER);
+		setlogmask(LOG_UPTO(level));
+	}
+
+	return 0;
+}
+
+void log_exit(void)
+{
+	closelog();
+}

tools/thermal/lib/log.h

+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __THERMAL_TOOLS_LOG_H
+#define __THERMAL_TOOLS_LOG_H
+
+#include <syslog.h>
+
+#ifndef __maybe_unused
+#define __maybe_unused		__attribute__((__unused__))
+#endif
+
+#define TO_SYSLOG 0x1
+#define TO_STDOUT 0x2
+#define TO_STDERR 0x4
+
+extern void logit(int level, const char *format, ...);
+
+#define DEBUG(fmt, ...)		logit(LOG_DEBUG, "%s:%d: " fmt, __func__, __LINE__, ##__VA_ARGS__)
+#define INFO(fmt, ...)		logit(LOG_INFO, fmt, ##__VA_ARGS__)
+#define NOTICE(fmt, ...)	logit(LOG_NOTICE, fmt, ##__VA_ARGS__)
+#define WARN(fmt, ...)		logit(LOG_WARNING, fmt, ##__VA_ARGS__)
+#define ERROR(fmt, ...)		logit(LOG_ERR, fmt, ##__VA_ARGS__)
+#define CRITICAL(fmt, ...)	logit(LOG_CRIT, fmt, ##__VA_ARGS__)
+#define ALERT(fmt, ...)		logit(LOG_ALERT, fmt, ##__VA_ARGS__)
+#define EMERG(fmt, ...)		logit(LOG_EMERG, fmt, ##__VA_ARGS__)
+
+int log_init(int level, const char *ident, int options);
+int log_str2level(const char *lvl);
+void log_exit(void);
+
+#endif

tools/thermal/lib/mainloop.c

+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <sys/epoll.h>
+#include "mainloop.h"
+#include "log.h"
+
+static int epfd = -1;
+static unsigned short nrhandler;
+static sig_atomic_t exit_mainloop;
+
+struct mainloop_data {
+	mainloop_callback_t cb;
+	void *data;
+	int fd;
+};
+
+static struct mainloop_data **mds;
+
+#define MAX_EVENTS 10
+
+int mainloop(unsigned int timeout)
+{
+	int i, nfds;
+	struct epoll_event events[MAX_EVENTS];
+	struct mainloop_data *md;
+
+	if (epfd < 0)
+		return -1;
+
+	for (;;) {
+
+		nfds = epoll_wait(epfd, events, MAX_EVENTS, timeout);
+
+		if (exit_mainloop || !nfds)
+			return 0;
+
+		if (nfds < 0) {
+			if (errno == EINTR)
+				continue;
+			return -1;
+		}
+
+		for (i = 0; i < nfds; i++) {
+			md = events[i].data.ptr;
+
+			if (md->cb(md->fd, md->data) > 0)
+				return 0;
+		}
+	}
+}
+
+int mainloop_add(int fd, mainloop_callback_t cb, void *data)
+{
+	struct epoll_event ev = {
+		.events = EPOLLIN,
+	};
+
+	struct mainloop_data *md;
+
+	if (fd >= nrhandler) {
+		mds = realloc(mds, sizeof(*mds) * (fd + 1));
+		if (!mds)
+			return -1;
+		nrhandler = fd + 1;
+	}
+
+	md = malloc(sizeof(*md));
+	if (!md)
+		return -1;
+
+	md->data = data;
+	md->cb = cb;
+	md->fd = fd;
+
+	mds[fd] = md;
+	ev.data.ptr = md;
+
+	if (epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev) < 0) {
+		free(md);
+		return -1;
+	}
+
+	return 0;
+}
+
+int mainloop_del(int fd)
+{
+	if (fd >= nrhandler)
+		return -1;
+
+	if (epoll_ctl(epfd, EPOLL_CTL_DEL, fd, NULL) < 0)
+		return -1;
+
+	free(mds[fd]);
+
+	return 0;
+}
+
+int mainloop_init(void)
+{
+	epfd = epoll_create(2);
+	if (epfd < 0)
+		return -1;
+
+	return 0;
+}
+
+void mainloop_exit(void)
+{
+	exit_mainloop = 1;
+}
+
+void mainloop_fini(void)
+{
+	close(epfd);
+}

tools/thermal/lib/mainloop.h

+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __THERMAL_TOOLS_MAINLOOP_H
+#define __THERMAL_TOOLS_MAINLOOP_H
+
+typedef int (*mainloop_callback_t)(int fd, void *data);
+
+extern int mainloop(unsigned int timeout);
+extern int mainloop_add(int fd, mainloop_callback_t cb, void *data);
+extern int mainloop_del(int fd);
+extern void mainloop_exit(void);
+extern int mainloop_init(void);
+extern void mainloop_fini(void);
+
+#endif

tools/thermal/lib/thermal-tools.h

+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __THERMAL_TOOLS
+#define __THERMAL_TOOLS
+
+#include "log.h"
+#include "mainloop.h"
+#include "uptimeofday.h"
+
+#endif

tools/thermal/lib/uptimeofday.c

+// SPDX-License-Identifier: LGPL-2.1+
+// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
+#include <stdio.h>
+#include <sys/time.h>
+#include <linux/sysinfo.h>
+#include "thermal-tools.h"
+
+static unsigned long __offset;
+static struct timeval __tv;
+
+int uptimeofday_init(void)
+{
+	struct sysinfo info;
+
+	if (sysinfo(&info))
+		return -1;
+
+	gettimeofday(&__tv, NULL);
+
+	__offset = __tv.tv_sec - info.uptime;
+
+	return 0;
+}
+
+unsigned long getuptimeofday_ms(void)
+{
+	gettimeofday(&__tv, NULL);
+
+	return ((__tv.tv_sec - __offset) * 1000) + (__tv.tv_usec / 1000);
+}
+
+struct timespec msec_to_timespec(int msec)
+{
+	struct timespec tv = {
+		.tv_sec = (msec / 1000),
+		.tv_nsec = (msec % 1000) * 1000000,
+	};
+
+	return tv;
+}

tools/thermal/lib/uptimeofday.h

+/* SPDX-License-Identifier: LGPL-2.1+ */
+/* Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> */
+#ifndef __THERMAL_TOOLS_UPTIMEOFDAY_H
+#define __THERMAL_TOOLS_UPTIMEOFDAY_H
+#include <sys/sysinfo.h>
+#include <sys/time.h>
+
+int uptimeofday_init(void);
+unsigned long getuptimeofday_ms(void);
+struct timespec msec_to_timespec(int msec);
+
+#endif

tools/thermal/thermal-engine/Build

+thermal-engine-y += thermal-engine.o

tools/thermal/thermal-engine/Makefile

+# SPDX-License-Identifier: GPL-2.0
+# Makefile for thermal tools
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+# $(info Determined 'srctree' to be $(srctree))
+endif
+
+CFLAGS = -Wall -Wextra
+CFLAGS += -I$(srctree)/tools/thermal/lib
+CFLAGS += -I$(srctree)/tools/lib/thermal/include
+
+LDFLAGS = -L$(srctree)/tools/thermal/lib
+LDFLAGS += -L$(srctree)/tools/lib/thermal
+LDFLAGS += -lthermal_tools
+LDFLAGS += -lthermal
+LDFLAGS += -lconfig
+LDFLAGS += -lnl-genl-3 -lnl-3
+
+VERSION = 0.0.1
+
+all: thermal-engine
+%: %.c
+	$(CC) $(CFLAGS) -D VERSION=\"$(VERSION)\" -o $@ $^ $(LDFLAGS)
+clean:
+	$(RM) thermal-engine

tools/thermal/thermal-engine/thermal-engine.c

+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Thermal monitoring tool based on the thermal netlink events.
+ *
+ * Copyright (C) 2022 Linaro Ltd.
+ *
+ * Author: Daniel Lezcano <daniel.lezcano@kernel.org>
+ */
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <libgen.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <unistd.h>
+
+#include <syslog.h>
+
+#include <sys/epoll.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <thermal.h>
+#include "thermal-tools.h"
+
+struct options {
+	int loglevel;
+	int logopt;
+	int interactive;
+	int daemonize;
+};
+
+struct thermal_data {
+	struct thermal_zone *tz;
+	struct thermal_handler *th;
+};
+
+static int show_trip(struct thermal_trip *tt, __maybe_unused void *arg)
+{
+	INFO("trip id=%d, type=%d, temp=%d, hyst=%d\n",
+	     tt->id, tt->type, tt->temp, tt->hyst);
+
+	return 0;
+}
+
+static int show_temp(struct thermal_zone *tz, __maybe_unused void *arg)
+{
+	thermal_cmd_get_temp(arg, tz);
+
+	INFO("temperature: %d\n", tz->temp);
+
+	return 0;
+}
+
+static int show_governor(struct thermal_zone *tz, __maybe_unused void *arg)
+{
+	thermal_cmd_get_governor(arg, tz);
+
+	INFO("governor: '%s'\n", tz->governor);
+
+	return 0;
+}
+
+static int show_tz(struct thermal_zone *tz, __maybe_unused void *arg)
+{
+	INFO("thermal zone '%s', id=%d\n", tz->name, tz->id);
+
+	for_each_thermal_trip(tz->trip, show_trip, NULL);
+
+	show_temp(tz, arg);
+
+	show_governor(tz, arg);
+
+	return 0;
+}
+
+static int tz_create(const char *name, int tz_id, __maybe_unused void *arg)
+{
+	INFO("Thermal zone '%s'/%d created\n", name, tz_id);
+
+	return 0;
+}
+
+static int tz_delete(int tz_id, __maybe_unused void *arg)
+{
+	INFO("Thermal zone %d deleted\n", tz_id);
+
+	return 0;
+}
+
+static int tz_disable(int tz_id, void *arg)
+{
+	struct thermal_data *td = arg;
+	struct thermal_zone *tz = thermal_zone_find_by_id(td->tz, tz_id);
+
+	INFO("Thermal zone %d ('%s') disabled\n", tz_id, tz->name);
+
+	return 0;
+}
+
+static int tz_enable(int tz_id, void *arg)
+{
+	struct thermal_data *td = arg;
+	struct thermal_zone *tz = thermal_zone_find_by_id(td->tz, tz_id);
+
+	INFO("Thermal zone %d ('%s') enabled\n", tz_id, tz->name);
+
+	return 0;
+}
+
+static int trip_high(int tz_id, int trip_id, int temp, void *arg)
+{
+	struct thermal_data *td = arg;
+	struct thermal_zone *tz = thermal_zone_find_by_id(td->tz, tz_id);
+
+	INFO("Thermal zone %d ('%s'): trip point %d crossed way up with %d °C\n",
+	     tz_id, tz->name, trip_id, temp);
+
+	return 0;
+}
+
+static int trip_low(int tz_id, int trip_id, int temp, void *arg)
+{
+	struct thermal_data *td = arg;
+	struct thermal_zone *tz = thermal_zone_find_by_id(td->tz, tz_id);
+
+	INFO("Thermal zone %d ('%s'): trip point %d crossed way down with %d °C\n",
+	     tz_id, tz->name, trip_id, temp);
+
+	return 0;
+}
+
+static int trip_add(int tz_id, int trip_id, int type, int temp, int hyst, __maybe_unused void *arg)
+{
+	INFO("Trip point added %d: id=%d, type=%d, temp=%d, hyst=%d\n",
+	     tz_id, trip_id, type, temp, hyst);
+
+	return 0;
+}
+
+static int trip_delete(int tz_id, int trip_id, __maybe_unused void *arg)
+{
+	INFO("Trip point deleted %d: id=%d\n", tz_id, trip_id);
+
+	return 0;
+}
+
+static int trip_change(int tz_id, int trip_id, int type, int temp,
+		       int hyst, __maybe_unused void *arg)
+{
+	struct thermal_data *td = arg;
+	struct thermal_zone *tz = thermal_zone_find_by_id(td->tz, tz_id);
+
+	INFO("Trip point changed %d: id=%d, type=%d, temp=%d, hyst=%d\n",
+	     tz_id, trip_id, type, temp, hyst);
+
+	tz->trip[trip_id].type = type;
+	tz->trip[trip_id].temp = temp;
+	tz->trip[trip_id].hyst = hyst;
+
+	return 0;
+}
+
+static int cdev_add(const char *name, int cdev_id, int max_state, __maybe_unused void *arg)
+{
+	INFO("Cooling device '%s'/%d (max state=%d) added\n", name, cdev_id, max_state);
+
+	return 0;
+}
+
+static int cdev_delete(int cdev_id, __maybe_unused void *arg)
+{
+	INFO("Cooling device %d deleted", cdev_id);
+
+	return 0;
+}
+
+static int cdev_update(int cdev_id, int cur_state, __maybe_unused void *arg)
+{
+	INFO("cdev:%d state:%d\n", cdev_id, cur_state);
+
+	return 0;
+}
+
+static int gov_change(int tz_id, const char *name, __maybe_unused void *arg)
+{
+	struct thermal_data *td = arg;
+	struct thermal_zone *tz = thermal_zone_find_by_id(td->tz, tz_id);
+
+	INFO("%s: governor changed %s -> %s\n", tz->name, tz->governor, name);
+
+	strcpy(tz->governor, name);
+
+	return 0;
+}
+
+static struct thermal_ops ops = {
+	.events.tz_create	= tz_create,
+	.events.tz_delete	= tz_delete,
+	.events.tz_disable	= tz_disable,
+	.events.tz_enable	= tz_enable,
+	.events.trip_high	= trip_high,
+	.events.trip_low	= trip_low,
+	.events.trip_add	= trip_add,
+	.events.trip_delete	= trip_delete,
+	.events.trip_change	= trip_change,
+	.events.cdev_add	= cdev_add,
+	.events.cdev_delete	= cdev_delete,
+	.events.cdev_update	= cdev_update,
+	.events.gov_change	= gov_change
+};
+
+static int thermal_event(__maybe_unused int fd, __maybe_unused void *arg)
+{
+	struct thermal_data *td = arg;
+
+	return thermal_events_handle(td->th, td);
+}
+
+static void usage(const char *cmd)
+{
+	printf("%s : A thermal monitoring engine based on notifications\n", cmd);
+	printf("Usage: %s [options]\n", cmd);
+	printf("\t-h, --help\t\tthis help\n");
+	printf("\t-d, --daemonize\n");
+	printf("\t-l <level>, --loglevel <level>\tlog level: ");
+	printf("DEBUG, INFO, NOTICE, WARN, ERROR\n");
+	printf("\t-s, --syslog\t\toutput to syslog\n");
+	printf("\n");
+	exit(0);
+}
+
+static int options_init(int argc, char *argv[], struct options *options)
+{
+	int opt;
+
+	struct option long_options[] = {
+		{ "help",	no_argument, NULL, 'h' },
+		{ "daemonize",	no_argument, NULL, 'd' },
+		{ "syslog",	no_argument, NULL, 's' },
+		{ "loglevel",	required_argument, NULL, 'l' },
+		{ 0, 0, 0, 0 }
+	};
+
+	while (1) {
+
+		int optindex = 0;
+
+		opt = getopt_long(argc, argv, "l:dhs", long_options, &optindex);
+		if (opt == -1)
+			break;
+
+		switch (opt) {
+		case 'l':
+			options->loglevel = log_str2level(optarg);
+			break;
+		case 'd':
+			options->daemonize = 1;
+			break;
+		case 's':
+			options->logopt = TO_SYSLOG;
+			break;
+		case 'h':
+			usage(basename(argv[0]));
+			break;
+		default: /* '?' */
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+enum {
+	THERMAL_ENGINE_SUCCESS = 0,
+	THERMAL_ENGINE_OPTION_ERROR,
+	THERMAL_ENGINE_DAEMON_ERROR,
+	THERMAL_ENGINE_LOG_ERROR,
+	THERMAL_ENGINE_THERMAL_ERROR,
+	THERMAL_ENGINE_MAINLOOP_ERROR,
+};
+
+int main(int argc, char *argv[])
+{
+	struct thermal_data td;
+	struct options options = {
+		.loglevel = LOG_INFO,
+		.logopt = TO_STDOUT,
+	};
+
+	if (options_init(argc, argv, &options)) {
+		ERROR("Usage: %s --help\n", argv[0]);
+		return THERMAL_ENGINE_OPTION_ERROR;
+	}
+
+	if (options.daemonize && daemon(0, 0)) {
+		ERROR("Failed to daemonize: %p\n");
+		return THERMAL_ENGINE_DAEMON_ERROR;
+	}
+
+	if (log_init(options.loglevel, basename(argv[0]), options.logopt)) {
+		ERROR("Failed to initialize logging facility\n");
+		return THERMAL_ENGINE_LOG_ERROR;
+	}
+
+	td.th = thermal_init(&ops);
+	if (!td.th) {
+		ERROR("Failed to initialize the thermal library\n");
+		return THERMAL_ENGINE_THERMAL_ERROR;
+	}
+
+	td.tz = thermal_zone_discover(td.th);
+	if (!td.tz) {
+		ERROR("No thermal zone available\n");
+		return THERMAL_ENGINE_THERMAL_ERROR;
+	}
+
+	for_each_thermal_zone(td.tz, show_tz, td.th);
+
+	if (mainloop_init()) {
+		ERROR("Failed to initialize the mainloop\n");
+		return THERMAL_ENGINE_MAINLOOP_ERROR;
+	}
+
+	if (mainloop_add(thermal_events_fd(td.th), thermal_event, &td)) {
+		ERROR("Failed to setup the mainloop\n");
+		return THERMAL_ENGINE_MAINLOOP_ERROR;
+	}
+
+	INFO("Waiting for thermal events ...\n");
+
+	if (mainloop(-1)) {
+		ERROR("Mainloop failed\n");
+		return THERMAL_ENGINE_MAINLOOP_ERROR;
+	}
+
+	return THERMAL_ENGINE_SUCCESS;
+}

tools/thermal/thermometer/Build

+thermometer-y += thermometer.o

tools/thermal/thermometer/Makefile

+# SPDX-License-Identifier: GPL-2.0
+# Makefile for cgroup tools
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+# $(info Determined 'srctree' to be $(srctree))
+endif
+
+CFLAGS = -Wall -Wextra
+CFLAGS += -I$(srctree)/tools/thermal/lib
+
+LDFLAGS = -L$(srctree)/tools/thermal/lib
+LDFLAGS += -lthermal_tools
+LDFLAGS += -lconfig
+
+VERSION = 0.0.1
+TARGET=thermometer
+
+all: $(TARGET)
+%: %.c
+	$(CC) $(CFLAGS) -D VERSION=\"$(VERSION)\" -o $@ $^ $(LDFLAGS)
+
+clean:
+	$(RM) $(TARGET)

tools/thermal/thermometer/thermometer.8

+.TH THERMOMETER 8
+# SPDX-License-Identifier: GPL-2.0
+.SH NAME
+\fBthermometer\fP - A thermal profiling tool
+
+.SH SYNOPSIS
+.ft B
+.B thermometer
+.RB [ options ]
+.RB [ command ]
+.br
+.SH DESCRIPTION
+\fBthermometer \fP captures the thermal zones temperature at a
+specified sampling period. It is optimized to reduce as much as
+possible the overhead while doing the temperature acquisition in order
+to prevent disrupting the running application we may want to profile.
+
+This low overhead also allows a high rate sampling for the temperature
+which could be necessary to spot overshots and undershots.
+
+If no configuration file is specified, then all the thermal zones will
+be monitored at 4Hz, so every 250ms. A configuration file specifies
+the thermal zone names and the desired sampling period. A thermal zone
+name can be a regular expression to specify a group of thermal zone.
+
+The sampling of the different thermal zones will be written into
+separate files with the thermal zone name. It is possible to specify a
+postfix to identify them for example for a specific scenario. The
+output directory can be specified in addition.
+
+Without any parameters, \fBthermometer \fP captures all the thermal
+zone temperatures every 250ms and write to the current directory the
+captured files postfixed with the current date.
+
+If a running \fBduration\fP is specified or a \fBcommand\fP, the
+capture ends at the end of the duration if the command did not
+finished before. The \fBduration\fP can be specified alone as well as
+the \fBcommand\fP. If none is specified, the capture will continue
+indefinitively until interrupted by \fBSIGINT\fP or \fBSIGQUIT\fP.
+.PP
+
+.SS Options
+.PP
+The \fB-h, --help\fP option shows a short usage help
+.PP
+The \fB-o <dir>, --output <dir>\fP option defines the output directory to put the
+sampling files
+.PP
+The \fB-c <config>, --config <config>\fP option specifies the configuration file to use
+.PP
+The \fB-d <seconds>, --duration <seconds>\fP option specifies the duration of the capture
+.PP
+The \fB-l <loglevel>, --loglevel <loglevel>\fP option sets the loglevel [DEBUG,INFO,NOTICE,WARN,ERROR]
+.PP
+The \fB-p <string>, --postfix <string>\fP option appends \fBstring\fP at the end of the capture filenames
+.PP
+The \fB-s, --syslog\fP option sets the output to syslog, default is \fBstdout\fP
+.PP
+The \fB-w, --overwrite\fP overwrites the output files if they exist
+.PP
+
+.PP
+
+.SS "Exit status:"
+.TP
+0
+if OK,
+.TP
+1
+Error with the options specified as parameters
+.TP
+2
+Error when configuring the logging facility
+.TP
+3
+Error when configuring the time
+.TP
+4
+Error in the initialization routine
+.TP
+5
+Error during the runtime
+
+.SH Capture file format
+
+Every file contains two columns. The first one is the uptime timestamp
+in order to find a point in time since the system started up if there
+is any thermal event. The second one is the temperature in milli
+degree. The first line contains the label of each column.
+
+.SH AUTHOR
+Daniel Lezcano <daniel.lezcano@kernel.org>

tools/thermal/thermometer/thermometer.conf

+
+thermal-zones = (
+	      {	name = "cpu[0-9]-thermal";
+		polling = 100; }
+      )