Merge "drivers: qti-virtual-sensor: Add virtual sensors for QTI chipsets"
diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
index 984241f9..0afc448 100644
--- a/drivers/thermal/of-thermal.c
+++ b/drivers/thermal/of-thermal.c
@@ -107,11 +107,78 @@
struct __sensor_param *senps;
};
+/**
+ * struct virtual_sensor - internal representation of a virtual thermal zone
+ * @num_sensors - number of sensors this virtual sensor will reference to
+ * estimate temperature
+ * @tz - Array of thermal zones of the sensors this virtual sensor will use
+ * to estimate temperature
+ * @logic - aggregation logic to be used to estimate the temperature
+ * @last_reading - last estimated temperature
+ * @coefficients - array of coefficients to be used for weighted aggregation
+ * logic
+ * @avg_offset - offset value to be used for the weighted aggregation logic
+ * @avg_denominator - denominator value to be used for the weighted aggregation
+ * logic
+ */
+struct virtual_sensor {
+ int num_sensors;
+ struct thermal_zone_device *tz[THERMAL_MAX_VIRT_SENSORS];
+ enum aggregation_logic logic;
+ int last_reading;
+ int coefficients[THERMAL_MAX_VIRT_SENSORS];
+ int avg_offset;
+ int avg_denominator;
+};
+
static int of_thermal_aggregate_trip_types(struct thermal_zone_device *tz,
unsigned int trip_type_mask, int *low, int *high);
/*** DT thermal zone device callbacks ***/
+static int virt_sensor_read_temp(void *data, int *val)
+{
+ struct virtual_sensor *sens = data;
+ int idx, temp = 0, ret = 0;
+
+ for (idx = 0; idx < sens->num_sensors; idx++) {
+ int sens_temp = 0;
+
+ ret = thermal_zone_get_temp(sens->tz[idx], &sens_temp);
+ if (ret) {
+ pr_err("virt zone: sensor[%s] read error:%d\n",
+ sens->tz[idx]->type, ret);
+ return ret;
+ }
+ switch (sens->logic) {
+ case VIRT_WEIGHTED_AVG:
+ temp += sens_temp * sens->coefficients[idx];
+ if (idx == (sens->num_sensors - 1))
+ temp = (temp + sens->avg_offset)
+ / sens->avg_denominator;
+ break;
+ case VIRT_MAXIMUM:
+ if (idx == 0)
+ temp = INT_MIN;
+ if (sens_temp > temp)
+ temp = sens_temp;
+ break;
+ case VIRT_MINIMUM:
+ if (idx == 0)
+ temp = INT_MAX;
+ if (sens_temp < temp)
+ temp = sens_temp;
+ break;
+ default:
+ break;
+ }
+ }
+
+ sens->last_reading = *val = temp;
+
+ return 0;
+}
+
static int of_thermal_get_temp(struct thermal_zone_device *tz,
int *temp)
{
@@ -516,6 +583,10 @@
.unbind = of_thermal_unbind,
};
+static struct thermal_zone_of_device_ops of_virt_ops = {
+ .get_temp = virt_sensor_read_temp,
+};
+
/*** sensor API ***/
static struct thermal_zone_device *
@@ -727,6 +798,134 @@
}
/**
+ * devm_thermal_of_virtual_sensor_register - Register a virtual sensor.
+ * Three types of virtual sensors are supported.
+ * 1. Weighted aggregation type:
+ * Virtual sensor of this type calculates the weighted aggregation
+ * of sensor temperatures using the below formula,
+ * temp = (sensor_1_temp * coeff_1 + ... + sensor_n_temp * coeff_n)
+ * + avg_offset / avg_denominator
+ * So the sensor drivers has to specify n+2 coefficients.
+ * 2. Maximum type:
+ * Virtual sensors of this type will report the maximum of all
+ * sensor temperatures.
+ * 3. Minimum type:
+ * Virtual sensors of this type will report the minimum of all
+ * sensor temperatures.
+ *
+ * @input arguments:
+ * @dev: Virtual sensor driver device pointer.
+ * @sensor_data: Virtual sensor data supported for the device.
+ *
+ * @return: Returns a virtual thermal zone pointer. Returns error if thermal
+ * zone is not created. Returns -EAGAIN, if the sensor that is required for
+ * this virtual sensor temperature estimation is not registered yet. The
+ * sensor driver can try again later.
+ */
+struct thermal_zone_device *devm_thermal_of_virtual_sensor_register(
+ struct device *dev,
+ const struct virtual_sensor_data *sensor_data)
+{
+ int sens_idx = 0;
+ struct virtual_sensor *sens;
+ struct __thermal_zone *tz;
+ struct thermal_zone_device **ptr;
+ struct thermal_zone_device *tzd;
+ struct __sensor_param *sens_param = NULL;
+ enum thermal_device_mode mode;
+
+ if (!dev || !sensor_data)
+ return ERR_PTR(-EINVAL);
+
+ tzd = thermal_zone_get_zone_by_name(
+ sensor_data->virt_zone_name);
+ if (IS_ERR(tzd)) {
+ dev_err(dev, "sens:%s not available err: %ld\n",
+ sensor_data->virt_zone_name,
+ PTR_ERR(tzd));
+ return tzd;
+ }
+
+ mutex_lock(&tzd->lock);
+ /*
+ * Check if the virtual zone is registered and enabled.
+ * If so return the registered thermal zone.
+ */
+ tzd->ops->get_mode(tzd, &mode);
+ mutex_unlock(&tzd->lock);
+ if (mode == THERMAL_DEVICE_ENABLED)
+ return tzd;
+
+ sens = devm_kzalloc(dev, sizeof(*sens), GFP_KERNEL);
+ if (!sens)
+ return ERR_PTR(-ENOMEM);
+
+ sens->logic = sensor_data->logic;
+ sens->num_sensors = sensor_data->num_sensors;
+ if (sens->logic == VIRT_WEIGHTED_AVG) {
+ int coeff_ct = sensor_data->coefficient_ct;
+
+ /*
+ * For weighted aggregation, sensor drivers has to specify
+ * n+2 coefficients.
+ */
+ if (coeff_ct != sens->num_sensors) {
+ dev_err(dev, "sens:%s Invalid coefficient\n",
+ sensor_data->virt_zone_name);
+ return ERR_PTR(-EINVAL);
+ }
+ memcpy(sens->coefficients, sensor_data->coefficients,
+ coeff_ct * sizeof(*sens->coefficients));
+ sens->avg_offset = sensor_data->avg_offset;
+ sens->avg_denominator = sensor_data->avg_denominator;
+ }
+
+ for (sens_idx = 0; sens_idx < sens->num_sensors; sens_idx++) {
+ sens->tz[sens_idx] = thermal_zone_get_zone_by_name(
+ sensor_data->sensor_names[sens_idx]);
+ if (IS_ERR(sens->tz[sens_idx])) {
+ dev_err(dev, "sens:%s sensor[%s] fetch err:%ld\n",
+ sensor_data->virt_zone_name,
+ sensor_data->sensor_names[sens_idx],
+ PTR_ERR(sens->tz[sens_idx]));
+ break;
+ }
+ }
+ if (sens->num_sensors != sens_idx)
+ return ERR_PTR(-EAGAIN);
+
+ sens_param = kzalloc(sizeof(*sens_param), GFP_KERNEL);
+ if (!sens_param)
+ return ERR_PTR(-ENOMEM);
+ sens_param->sensor_data = sens;
+ sens_param->ops = &of_virt_ops;
+ INIT_LIST_HEAD(&sens_param->first_tz);
+ sens_param->trip_high = INT_MAX;
+ sens_param->trip_low = INT_MIN;
+ mutex_init(&sens_param->lock);
+
+ mutex_lock(&tzd->lock);
+ tz = tzd->devdata;
+ tz->senps = sens_param;
+ tzd->ops->get_temp = of_thermal_get_temp;
+ list_add_tail(&tz->list, &sens_param->first_tz);
+ mutex_unlock(&tzd->lock);
+
+ ptr = devres_alloc(devm_thermal_zone_of_sensor_release, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return ERR_PTR(-ENOMEM);
+
+ *ptr = tzd;
+ devres_add(dev, ptr);
+
+ tzd->ops->set_mode(tzd, THERMAL_DEVICE_ENABLED);
+
+ return tzd;
+}
+EXPORT_SYMBOL(devm_thermal_of_virtual_sensor_register);
+
+/**
* devm_thermal_zone_of_sensor_register - Resource managed version of
* thermal_zone_of_sensor_register()
* @dev: a valid struct device pointer of a sensor device. Must contain
diff --git a/drivers/thermal/qcom/Kconfig b/drivers/thermal/qcom/Kconfig
index 473d15a..f6e1b86 100644
--- a/drivers/thermal/qcom/Kconfig
+++ b/drivers/thermal/qcom/Kconfig
@@ -30,3 +30,13 @@
each cluster can be used to perform quick thermal mitigations by
tracking temperatures of the CPUs and taking thermal action in the
hardware without s/w intervention.
+
+config QTI_VIRTUAL_SENSOR
+ bool "QTI Virtual Sensor driver"
+ depends on THERMAL_OF
+ help
+ This driver has the information about the virtual sensors used by
+ QTI chipset's and registers the virtual sensors to a thermal zone.
+ The virtual sensor information includes the underlying thermal
+ sensors to query for temperature and the aggregation logic to
+ determine the virtual sensor temperature.
diff --git a/drivers/thermal/qcom/Makefile b/drivers/thermal/qcom/Makefile
index d1a53b0..8859380 100644
--- a/drivers/thermal/qcom/Makefile
+++ b/drivers/thermal/qcom/Makefile
@@ -2,3 +2,4 @@
qcom_tsens-y += tsens.o tsens-common.o tsens-8916.o tsens-8974.o tsens-8960.o tsens-8996.o
obj-$(CONFIG_MSM_BCL_PERIPHERAL_CTL) += bcl_peripheral.o
obj-$(CONFIG_QTI_THERMAL_LIMITS_DCVS) += msm_lmh_dcvs.o
+obj-$(CONFIG_QTI_VIRTUAL_SENSOR) += qti_virtual_sensor.o
diff --git a/drivers/thermal/qcom/qti_virtual_sensor.c b/drivers/thermal/qcom/qti_virtual_sensor.c
new file mode 100644
index 0000000..3064c74
--- /dev/null
+++ b/drivers/thermal/qcom/qti_virtual_sensor.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2017, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+
+#include <linux/thermal.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+
+#include "qti_virtual_sensor.h"
+
+static const struct virtual_sensor_data qti_virtual_sensors[] = {
+ {
+ .virt_zone_name = "gpu-virt-max-step",
+ .num_sensors = 2,
+ .sensor_names = {"gpu0-usr",
+ "gpu1-usr"},
+ .logic = VIRT_MAXIMUM,
+ },
+ {
+ .virt_zone_name = "silver-virt-max-usr",
+ .num_sensors = 4,
+ .sensor_names = {"cpu0-silver-usr",
+ "cpu1-silver-usr",
+ "cpu2-silver-usr",
+ "cpu3-silver-usr"},
+ .logic = VIRT_MAXIMUM,
+ },
+ {
+ .virt_zone_name = "gold-virt-max-usr",
+ .num_sensors = 4,
+ .sensor_names = {"cpu0-gold-usr",
+ "cpu1-gold-usr",
+ "cpu2-gold-usr",
+ "cpu3-gold-usr"},
+ .logic = VIRT_MAXIMUM,
+ },
+};
+
+int qti_virtual_sensor_register(struct device *dev)
+{
+ int sens_ct = 0;
+ static int idx;
+ struct thermal_zone_device *tz;
+
+ sens_ct = ARRAY_SIZE(qti_virtual_sensors);
+ for (; idx < sens_ct; idx++) {
+ tz = devm_thermal_of_virtual_sensor_register(dev,
+ &qti_virtual_sensors[idx]);
+ if (IS_ERR(tz))
+ dev_dbg(dev, "sensor:%d register error:%ld\n",
+ idx, PTR_ERR(tz));
+ else
+ dev_dbg(dev, "sensor:%d registered\n", idx);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(qti_virtual_sensor_register);
diff --git a/drivers/thermal/qcom/qti_virtual_sensor.h b/drivers/thermal/qcom/qti_virtual_sensor.h
new file mode 100644
index 0000000..371b794
--- /dev/null
+++ b/drivers/thermal/qcom/qti_virtual_sensor.h
@@ -0,0 +1,29 @@
+/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __QTI_VIRT_SENS_H__
+#define __QTI_VIRT_SENS_H__
+
+#ifdef CONFIG_QTI_VIRTUAL_SENSOR
+
+int qti_virtual_sensor_register(struct device *dev);
+
+#else
+
+static inline int qti_virtual_sensor_register(struct device *dev)
+{
+ return -ENODEV;
+}
+
+#endif /* CONFIG_QTI_VIRTUAL_SENSOR */
+
+#endif /* __QTI_VIRT_SENS_H__ */
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 8491bdc..9b0d5cb 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -43,6 +43,9 @@
/* Default weight of a bound cooling device */
#define THERMAL_WEIGHT_DEFAULT 0
+/* Max sensors that can be used for a single virtual thermalzone */
+#define THERMAL_MAX_VIRT_SENSORS 5
+
/* use value, which < 0K, to indicate an invalid/uninitialized temperature */
#define THERMAL_TEMP_INVALID -274000
@@ -405,6 +408,39 @@
enum thermal_trip_type type;
};
+/* Different aggregation logic supported for virtual sensors */
+enum aggregation_logic {
+ VIRT_WEIGHTED_AVG,
+ VIRT_MAXIMUM,
+ VIRT_MINIMUM,
+ VIRT_AGGREGATION_NR,
+};
+
+/*
+ * struct virtual_sensor_data - Data structure used to provide
+ * information about the virtual zone.
+ * @virt_zone_name - Virtual thermal zone name
+ * @num_sensors - Number of sensors this virtual zone uses to compute
+ * temperature
+ * @sensor_names - Array of sensor names
+ * @logic - Temperature aggregation logic to be used
+ * @coefficients - Coefficients to be used for weighted average logic
+ * @coefficient_ct - number of coefficients provided as input
+ * @avg_offset - offset value to be used for the weighted aggregation logic
+ * @avg_denominator - denominator value to be used for the weighted aggregation
+ * logic
+ */
+struct virtual_sensor_data {
+ int num_sensors;
+ char virt_zone_name[THERMAL_NAME_LENGTH];
+ char *sensor_names[THERMAL_MAX_VIRT_SENSORS];
+ enum aggregation_logic logic;
+ int coefficients[THERMAL_MAX_VIRT_SENSORS];
+ int coefficient_ct;
+ int avg_offset;
+ int avg_denominator;
+};
+
/* Function declarations */
#ifdef CONFIG_THERMAL_OF
struct thermal_zone_device *
@@ -417,6 +453,9 @@
const struct thermal_zone_of_device_ops *ops);
void devm_thermal_zone_of_sensor_unregister(struct device *dev,
struct thermal_zone_device *tz);
+struct thermal_zone_device *devm_thermal_of_virtual_sensor_register(
+ struct device *dev,
+ const struct virtual_sensor_data *sensor_data);
#else
static inline struct thermal_zone_device *
thermal_zone_of_sensor_register(struct device *dev, int id, void *data,
@@ -444,6 +483,14 @@
{
}
+static inline
+struct thermal_zone_device *devm_thermal_of_virtual_sensor_register(
+ struct device *dev,
+ const struct virtual_sensor_data *sensor_data)
+{
+ return ERR_PTR(-ENODEV);
+}
+
#endif
#if IS_ENABLED(CONFIG_THERMAL)