634 lines
16 KiB
C
634 lines
16 KiB
C
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/*
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* thermal.c - sysfs interface of thermal devices
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*
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* Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
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*
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* Highly based on original thermal_core.c
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* Copyright (C) 2008 Intel Corp
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* Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
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* Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/sysfs.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include "thermal_core.h"
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/* sys I/F for thermal zone */
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static ssize_t
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type_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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return sprintf(buf, "%s\n", tz->type);
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}
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static ssize_t
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temp_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int temperature, ret;
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ret = thermal_zone_get_temp(tz, &temperature);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n", temperature);
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}
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static ssize_t
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mode_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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enum thermal_device_mode mode;
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int result;
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if (!tz->ops->get_mode)
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return -EPERM;
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result = tz->ops->get_mode(tz, &mode);
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if (result)
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return result;
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return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
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: "disabled");
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}
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static ssize_t
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mode_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int result;
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if (!tz->ops->set_mode)
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return -EPERM;
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if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
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result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
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else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
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result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
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else
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result = -EINVAL;
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if (result)
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return result;
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return count;
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}
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static ssize_t
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trip_point_type_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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enum thermal_trip_type type;
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int trip, result;
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if (!tz->ops->get_trip_type)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_type", &trip) != 1)
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return -EINVAL;
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result = tz->ops->get_trip_type(tz, trip, &type);
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if (result)
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return result;
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switch (type) {
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case THERMAL_TRIP_CRITICAL:
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return sprintf(buf, "critical\n");
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case THERMAL_TRIP_HOT:
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return sprintf(buf, "hot\n");
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case THERMAL_TRIP_PASSIVE:
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return sprintf(buf, "passive\n");
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case THERMAL_TRIP_ACTIVE:
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return sprintf(buf, "active\n");
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default:
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return sprintf(buf, "unknown\n");
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}
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}
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static ssize_t
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trip_point_temp_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip, ret;
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int temperature;
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if (!tz->ops->set_trip_temp)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
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return -EINVAL;
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if (kstrtoint(buf, 10, &temperature))
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return -EINVAL;
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ret = tz->ops->set_trip_temp(tz, trip, temperature);
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if (ret)
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return ret;
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thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
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return count;
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}
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static ssize_t
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trip_point_temp_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip, ret;
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int temperature;
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if (!tz->ops->get_trip_temp)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip) != 1)
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return -EINVAL;
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ret = tz->ops->get_trip_temp(tz, trip, &temperature);
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if (ret)
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return ret;
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return sprintf(buf, "%d\n", temperature);
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}
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static ssize_t
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trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip, ret;
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int temperature;
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if (!tz->ops->set_trip_hyst)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
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return -EINVAL;
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if (kstrtoint(buf, 10, &temperature))
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return -EINVAL;
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/*
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* We are not doing any check on the 'temperature' value
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* here. The driver implementing 'set_trip_hyst' has to
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* take care of this.
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*/
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ret = tz->ops->set_trip_hyst(tz, trip, temperature);
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if (!ret)
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thermal_zone_set_trips(tz);
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return ret ? ret : count;
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}
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static ssize_t
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trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int trip, ret;
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int temperature;
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if (!tz->ops->get_trip_hyst)
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return -EPERM;
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if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip) != 1)
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return -EINVAL;
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ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
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return ret ? ret : sprintf(buf, "%d\n", temperature);
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}
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static ssize_t
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passive_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int state;
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if (sscanf(buf, "%d\n", &state) != 1)
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return -EINVAL;
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/* sanity check: values below 1000 millicelcius don't make sense
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* and can cause the system to go into a thermal heart attack
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*/
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if (state && state < 1000)
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return -EINVAL;
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if (state && !tz->forced_passive) {
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if (!tz->passive_delay)
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tz->passive_delay = 1000;
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thermal_zone_device_rebind_exception(tz, "Processor",
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sizeof("Processor"));
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} else if (!state && tz->forced_passive) {
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tz->passive_delay = 0;
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thermal_zone_device_unbind_exception(tz, "Processor",
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sizeof("Processor"));
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}
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tz->forced_passive = state;
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thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
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return count;
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}
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static ssize_t
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passive_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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return sprintf(buf, "%d\n", tz->forced_passive);
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}
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static ssize_t
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policy_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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char name[THERMAL_NAME_LENGTH];
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int ret;
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snprintf(name, sizeof(name), "%s", buf);
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ret = thermal_zone_device_set_policy(tz, name);
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if (!ret)
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ret = count;
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return ret;
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}
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static ssize_t
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policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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return sprintf(buf, "%s\n", tz->governor->name);
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}
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static ssize_t
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available_policies_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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return thermal_build_list_of_policies(buf);
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}
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static ssize_t
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emul_temp_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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int ret = 0;
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int temperature;
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if (kstrtoint(buf, 10, &temperature))
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return -EINVAL;
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if (!tz->ops->set_emul_temp) {
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mutex_lock(&tz->lock);
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tz->emul_temperature = temperature;
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mutex_unlock(&tz->lock);
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} else {
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ret = tz->ops->set_emul_temp(tz, temperature);
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}
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if (!ret)
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thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
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return ret ? ret : count;
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}
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static ssize_t
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sustainable_power_show(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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if (tz->tzp)
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return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
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else
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return -EIO;
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}
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static ssize_t
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sustainable_power_store(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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u32 sustainable_power;
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if (!tz->tzp)
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return -EIO;
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if (kstrtou32(buf, 10, &sustainable_power))
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return -EINVAL;
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tz->tzp->sustainable_power = sustainable_power;
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return count;
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}
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#define create_s32_tzp_attr(name) \
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static ssize_t \
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name##_show(struct device *dev, struct device_attribute *devattr, \
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char *buf) \
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{ \
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struct thermal_zone_device *tz = to_thermal_zone(dev); \
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\
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if (tz->tzp) \
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return sprintf(buf, "%d\n", tz->tzp->name); \
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else \
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return -EIO; \
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} \
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\
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static ssize_t \
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name##_store(struct device *dev, struct device_attribute *devattr, \
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const char *buf, size_t count) \
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{ \
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struct thermal_zone_device *tz = to_thermal_zone(dev); \
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s32 value; \
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\
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if (!tz->tzp) \
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return -EIO; \
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\
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if (kstrtos32(buf, 10, &value)) \
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return -EINVAL; \
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\
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tz->tzp->name = value; \
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\
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return count; \
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} \
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static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
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create_s32_tzp_attr(k_po);
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create_s32_tzp_attr(k_pu);
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create_s32_tzp_attr(k_i);
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create_s32_tzp_attr(k_d);
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create_s32_tzp_attr(integral_cutoff);
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create_s32_tzp_attr(slope);
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create_s32_tzp_attr(offset);
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#undef create_s32_tzp_attr
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/*
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* These are thermal zone device attributes that will always be present.
|
||
|
|
* All the attributes created for tzp (create_s32_tzp_attr) also are always
|
||
|
|
* present on the sysfs interface.
|
||
|
|
*/
|
||
|
|
static DEVICE_ATTR(type, 0444, type_show, NULL);
|
||
|
|
static DEVICE_ATTR(temp, 0444, temp_show, NULL);
|
||
|
|
static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
|
||
|
|
static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
|
||
|
|
static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
|
||
|
|
static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
|
||
|
|
sustainable_power_store);
|
||
|
|
|
||
|
|
/* These thermal zone device attributes are created based on conditions */
|
||
|
|
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
|
||
|
|
static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
|
||
|
|
|
||
|
|
/* These attributes are unconditionally added to a thermal zone */
|
||
|
|
static struct attribute *thermal_zone_dev_attrs[] = {
|
||
|
|
&dev_attr_type.attr,
|
||
|
|
&dev_attr_temp.attr,
|
||
|
|
#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
|
||
|
|
&dev_attr_emul_temp.attr,
|
||
|
|
#endif
|
||
|
|
&dev_attr_policy.attr,
|
||
|
|
&dev_attr_available_policies.attr,
|
||
|
|
&dev_attr_sustainable_power.attr,
|
||
|
|
&dev_attr_k_po.attr,
|
||
|
|
&dev_attr_k_pu.attr,
|
||
|
|
&dev_attr_k_i.attr,
|
||
|
|
&dev_attr_k_d.attr,
|
||
|
|
&dev_attr_integral_cutoff.attr,
|
||
|
|
&dev_attr_slope.attr,
|
||
|
|
&dev_attr_offset.attr,
|
||
|
|
NULL,
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct attribute_group thermal_zone_attribute_group = {
|
||
|
|
.attrs = thermal_zone_dev_attrs,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* We expose mode only if .get_mode is present */
|
||
|
|
static struct attribute *thermal_zone_mode_attrs[] = {
|
||
|
|
&dev_attr_mode.attr,
|
||
|
|
NULL,
|
||
|
|
};
|
||
|
|
|
||
|
|
static umode_t thermal_zone_mode_is_visible(struct kobject *kobj,
|
||
|
|
struct attribute *attr,
|
||
|
|
int attrno)
|
||
|
|
{
|
||
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
||
|
|
struct thermal_zone_device *tz;
|
||
|
|
|
||
|
|
tz = container_of(dev, struct thermal_zone_device, device);
|
||
|
|
|
||
|
|
if (tz->ops->get_mode)
|
||
|
|
return attr->mode;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct attribute_group thermal_zone_mode_attribute_group = {
|
||
|
|
.attrs = thermal_zone_mode_attrs,
|
||
|
|
.is_visible = thermal_zone_mode_is_visible,
|
||
|
|
};
|
||
|
|
|
||
|
|
/* We expose passive only if passive trips are present */
|
||
|
|
static struct attribute *thermal_zone_passive_attrs[] = {
|
||
|
|
&dev_attr_passive.attr,
|
||
|
|
NULL,
|
||
|
|
};
|
||
|
|
|
||
|
|
static umode_t thermal_zone_passive_is_visible(struct kobject *kobj,
|
||
|
|
struct attribute *attr,
|
||
|
|
int attrno)
|
||
|
|
{
|
||
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
||
|
|
struct thermal_zone_device *tz;
|
||
|
|
enum thermal_trip_type trip_type;
|
||
|
|
int count, passive = 0;
|
||
|
|
|
||
|
|
tz = container_of(dev, struct thermal_zone_device, device);
|
||
|
|
|
||
|
|
for (count = 0; count < tz->trips && !passive; count++) {
|
||
|
|
tz->ops->get_trip_type(tz, count, &trip_type);
|
||
|
|
|
||
|
|
if (trip_type == THERMAL_TRIP_PASSIVE)
|
||
|
|
passive = 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!passive)
|
||
|
|
return attr->mode;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct attribute_group thermal_zone_passive_attribute_group = {
|
||
|
|
.attrs = thermal_zone_passive_attrs,
|
||
|
|
.is_visible = thermal_zone_passive_is_visible,
|
||
|
|
};
|
||
|
|
|
||
|
|
static const struct attribute_group *thermal_zone_attribute_groups[] = {
|
||
|
|
&thermal_zone_attribute_group,
|
||
|
|
&thermal_zone_mode_attribute_group,
|
||
|
|
&thermal_zone_passive_attribute_group,
|
||
|
|
/* This is not NULL terminated as we create the group dynamically */
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* create_trip_attrs() - create attributes for trip points
|
||
|
|
* @tz: the thermal zone device
|
||
|
|
* @mask: Writeable trip point bitmap.
|
||
|
|
*
|
||
|
|
* helper function to instantiate sysfs entries for every trip
|
||
|
|
* point and its properties of a struct thermal_zone_device.
|
||
|
|
*
|
||
|
|
* Return: 0 on success, the proper error value otherwise.
|
||
|
|
*/
|
||
|
|
static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
|
||
|
|
{
|
||
|
|
int size = sizeof(struct thermal_attr) * tz->trips;
|
||
|
|
struct attribute **attrs;
|
||
|
|
int indx;
|
||
|
|
|
||
|
|
/* This function works only for zones with at least one trip */
|
||
|
|
if (tz->trips <= 0)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
|
||
|
|
if (!tz->trip_type_attrs)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
|
||
|
|
if (!tz->trip_temp_attrs) {
|
||
|
|
kfree(tz->trip_type_attrs);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (tz->ops->get_trip_hyst) {
|
||
|
|
tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
|
||
|
|
if (!tz->trip_hyst_attrs) {
|
||
|
|
kfree(tz->trip_type_attrs);
|
||
|
|
kfree(tz->trip_temp_attrs);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
attrs = kzalloc(sizeof(*attrs) * tz->trips * 3 + 1, GFP_KERNEL);
|
||
|
|
if (!attrs) {
|
||
|
|
kfree(tz->trip_type_attrs);
|
||
|
|
kfree(tz->trip_temp_attrs);
|
||
|
|
if (tz->ops->get_trip_hyst)
|
||
|
|
kfree(tz->trip_hyst_attrs);
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
for (indx = 0; indx < tz->trips; indx++) {
|
||
|
|
/* create trip type attribute */
|
||
|
|
snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
|
||
|
|
"trip_point_%d_type", indx);
|
||
|
|
|
||
|
|
sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
|
||
|
|
tz->trip_type_attrs[indx].attr.attr.name =
|
||
|
|
tz->trip_type_attrs[indx].name;
|
||
|
|
tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
|
||
|
|
tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
|
||
|
|
attrs[indx] = &tz->trip_type_attrs[indx].attr.attr;
|
||
|
|
|
||
|
|
/* create trip temp attribute */
|
||
|
|
snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
|
||
|
|
"trip_point_%d_temp", indx);
|
||
|
|
|
||
|
|
sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
|
||
|
|
tz->trip_temp_attrs[indx].attr.attr.name =
|
||
|
|
tz->trip_temp_attrs[indx].name;
|
||
|
|
tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
|
||
|
|
tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
|
||
|
|
if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
|
||
|
|
mask & (1 << indx)) {
|
||
|
|
tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
|
||
|
|
tz->trip_temp_attrs[indx].attr.store =
|
||
|
|
trip_point_temp_store;
|
||
|
|
}
|
||
|
|
attrs[indx + tz->trips] = &tz->trip_temp_attrs[indx].attr.attr;
|
||
|
|
|
||
|
|
/* create Optional trip hyst attribute */
|
||
|
|
if (!tz->ops->get_trip_hyst)
|
||
|
|
continue;
|
||
|
|
snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
|
||
|
|
"trip_point_%d_hyst", indx);
|
||
|
|
|
||
|
|
sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
|
||
|
|
tz->trip_hyst_attrs[indx].attr.attr.name =
|
||
|
|
tz->trip_hyst_attrs[indx].name;
|
||
|
|
tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
|
||
|
|
tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
|
||
|
|
if (tz->ops->set_trip_hyst) {
|
||
|
|
tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
|
||
|
|
tz->trip_hyst_attrs[indx].attr.store =
|
||
|
|
trip_point_hyst_store;
|
||
|
|
}
|
||
|
|
attrs[indx + tz->trips * 2] =
|
||
|
|
&tz->trip_hyst_attrs[indx].attr.attr;
|
||
|
|
}
|
||
|
|
attrs[tz->trips * 3] = NULL;
|
||
|
|
|
||
|
|
tz->trips_attribute_group.attrs = attrs;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int thermal_zone_create_device_groups(struct thermal_zone_device *tz,
|
||
|
|
int mask)
|
||
|
|
{
|
||
|
|
const struct attribute_group **groups;
|
||
|
|
int i, size, result;
|
||
|
|
|
||
|
|
/* we need one extra for trips and the NULL to terminate the array */
|
||
|
|
size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
|
||
|
|
/* This also takes care of API requirement to be NULL terminated */
|
||
|
|
groups = kcalloc(size, sizeof(*groups), GFP_KERNEL);
|
||
|
|
if (!groups)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
for (i = 0; i < size - 2; i++)
|
||
|
|
groups[i] = thermal_zone_attribute_groups[i];
|
||
|
|
|
||
|
|
if (tz->trips) {
|
||
|
|
result = create_trip_attrs(tz, mask);
|
||
|
|
if (result) {
|
||
|
|
kfree(groups);
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
groups[size - 2] = &tz->trips_attribute_group;
|
||
|
|
}
|
||
|
|
|
||
|
|
tz->device.groups = groups;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|