1226 lines
31 KiB
C
1226 lines
31 KiB
C
/*
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* thermal.c - Generic Thermal Management Sysfs support.
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*
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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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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/kdev_t.h>
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#include <linux/idr.h>
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#include <linux/thermal.h>
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#include <linux/spinlock.h>
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#include <linux/reboot.h>
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MODULE_AUTHOR("Zhang Rui");
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MODULE_DESCRIPTION("Generic thermal management sysfs support");
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MODULE_LICENSE("GPL");
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#define PREFIX "Thermal: "
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struct thermal_cooling_device_instance {
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int id;
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char name[THERMAL_NAME_LENGTH];
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struct thermal_zone_device *tz;
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struct thermal_cooling_device *cdev;
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int trip;
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char attr_name[THERMAL_NAME_LENGTH];
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struct device_attribute attr;
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struct list_head node;
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};
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static DEFINE_IDR(thermal_tz_idr);
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static DEFINE_IDR(thermal_cdev_idr);
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static DEFINE_MUTEX(thermal_idr_lock);
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static LIST_HEAD(thermal_tz_list);
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static LIST_HEAD(thermal_cdev_list);
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static DEFINE_MUTEX(thermal_list_lock);
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static int get_idr(struct idr *idr, struct mutex *lock, int *id)
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{
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int err;
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again:
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if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
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return -ENOMEM;
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if (lock)
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mutex_lock(lock);
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err = idr_get_new(idr, NULL, id);
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if (lock)
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mutex_unlock(lock);
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if (unlikely(err == -EAGAIN))
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goto again;
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else if (unlikely(err))
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return err;
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*id = *id & MAX_ID_MASK;
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return 0;
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}
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static void release_idr(struct idr *idr, struct mutex *lock, int id)
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{
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if (lock)
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mutex_lock(lock);
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idr_remove(idr, id);
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if (lock)
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mutex_unlock(lock);
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}
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/* sys I/F for thermal zone */
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#define to_thermal_zone(_dev) \
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container_of(_dev, struct thermal_zone_device, device)
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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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long temperature;
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int ret;
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if (!tz->ops->get_temp)
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return -EPERM;
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ret = tz->ops->get_temp(tz, &temperature);
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if (ret)
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return ret;
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return sprintf(buf, "%ld\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")))
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result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
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else if (!strncmp(buf, "disabled", sizeof("disabled")))
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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))
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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");
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case THERMAL_TRIP_HOT:
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return sprintf(buf, "hot");
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case THERMAL_TRIP_PASSIVE:
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return sprintf(buf, "passive");
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case THERMAL_TRIP_ACTIVE:
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return sprintf(buf, "active");
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default:
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return sprintf(buf, "unknown");
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}
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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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long 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))
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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, "%ld\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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struct thermal_cooling_device *cdev = NULL;
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int state;
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if (!sscanf(buf, "%d\n", &state))
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return -EINVAL;
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if (state && !tz->forced_passive) {
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mutex_lock(&thermal_list_lock);
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list_for_each_entry(cdev, &thermal_cdev_list, node) {
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if (!strncmp("Processor", cdev->type,
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sizeof("Processor")))
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thermal_zone_bind_cooling_device(tz,
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THERMAL_TRIPS_NONE,
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cdev);
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}
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mutex_unlock(&thermal_list_lock);
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} else if (!state && tz->forced_passive) {
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mutex_lock(&thermal_list_lock);
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list_for_each_entry(cdev, &thermal_cdev_list, node) {
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if (!strncmp("Processor", cdev->type,
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sizeof("Processor")))
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thermal_zone_unbind_cooling_device(tz,
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THERMAL_TRIPS_NONE,
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cdev);
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}
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mutex_unlock(&thermal_list_lock);
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}
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tz->tc1 = 1;
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tz->tc2 = 1;
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if (!tz->passive_delay)
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tz->passive_delay = 1000;
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if (!tz->polling_delay)
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tz->polling_delay = 10000;
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tz->forced_passive = state;
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thermal_zone_device_update(tz);
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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 DEVICE_ATTR(type, 0444, type_show, NULL);
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static DEVICE_ATTR(temp, 0444, temp_show, NULL);
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static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
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static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, \
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passive_store);
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static struct device_attribute trip_point_attrs[] = {
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__ATTR(trip_point_0_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_0_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_1_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_1_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_2_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_2_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_3_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_3_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_4_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_4_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_5_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_5_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_6_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_6_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_7_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_7_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_8_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_8_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_9_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_9_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_10_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_10_temp, 0444, trip_point_temp_show, NULL),
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__ATTR(trip_point_11_type, 0444, trip_point_type_show, NULL),
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__ATTR(trip_point_11_temp, 0444, trip_point_temp_show, NULL),
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};
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#define TRIP_POINT_ATTR_ADD(_dev, _index, result) \
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do { \
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result = device_create_file(_dev, \
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&trip_point_attrs[_index * 2]); \
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if (result) \
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break; \
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result = device_create_file(_dev, \
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&trip_point_attrs[_index * 2 + 1]); \
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} while (0)
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#define TRIP_POINT_ATTR_REMOVE(_dev, _index) \
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do { \
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device_remove_file(_dev, &trip_point_attrs[_index * 2]); \
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device_remove_file(_dev, &trip_point_attrs[_index * 2 + 1]); \
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} while (0)
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/* sys I/F for cooling device */
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#define to_cooling_device(_dev) \
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container_of(_dev, struct thermal_cooling_device, device)
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static ssize_t
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thermal_cooling_device_type_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct thermal_cooling_device *cdev = to_cooling_device(dev);
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return sprintf(buf, "%s\n", cdev->type);
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}
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static ssize_t
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thermal_cooling_device_max_state_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct thermal_cooling_device *cdev = to_cooling_device(dev);
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unsigned long state;
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int ret;
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ret = cdev->ops->get_max_state(cdev, &state);
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if (ret)
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return ret;
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return sprintf(buf, "%ld\n", state);
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}
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|
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static ssize_t
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thermal_cooling_device_cur_state_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
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unsigned long state;
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int ret;
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|
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ret = cdev->ops->get_cur_state(cdev, &state);
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if (ret)
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return ret;
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return sprintf(buf, "%ld\n", state);
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}
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|
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static ssize_t
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thermal_cooling_device_cur_state_store(struct device *dev,
|
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
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unsigned long state;
|
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int result;
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|
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if (!sscanf(buf, "%ld\n", &state))
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return -EINVAL;
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|
|
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if (state < 0)
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return -EINVAL;
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|
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result = cdev->ops->set_cur_state(cdev, state);
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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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|
|
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static struct device_attribute dev_attr_cdev_type =
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__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
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static DEVICE_ATTR(max_state, 0444,
|
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thermal_cooling_device_max_state_show, NULL);
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static DEVICE_ATTR(cur_state, 0644,
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thermal_cooling_device_cur_state_show,
|
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thermal_cooling_device_cur_state_store);
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|
|
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static ssize_t
|
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thermal_cooling_device_trip_point_show(struct device *dev,
|
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struct device_attribute *attr, char *buf)
|
|
{
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struct thermal_cooling_device_instance *instance;
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|
|
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instance =
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container_of(attr, struct thermal_cooling_device_instance, attr);
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|
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if (instance->trip == THERMAL_TRIPS_NONE)
|
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return sprintf(buf, "-1\n");
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else
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return sprintf(buf, "%d\n", instance->trip);
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}
|
|
|
|
/* Device management */
|
|
|
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#if defined(CONFIG_THERMAL_HWMON)
|
|
|
|
/* hwmon sys I/F */
|
|
#include <linux/hwmon.h>
|
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static LIST_HEAD(thermal_hwmon_list);
|
|
|
|
static ssize_t
|
|
name_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_hwmon_device *hwmon = dev->driver_data;
|
|
return sprintf(buf, "%s\n", hwmon->type);
|
|
}
|
|
static DEVICE_ATTR(name, 0444, name_show, NULL);
|
|
|
|
static ssize_t
|
|
temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
long temperature;
|
|
int ret;
|
|
struct thermal_hwmon_attr *hwmon_attr
|
|
= container_of(attr, struct thermal_hwmon_attr, attr);
|
|
struct thermal_zone_device *tz
|
|
= container_of(hwmon_attr, struct thermal_zone_device,
|
|
temp_input);
|
|
|
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ret = tz->ops->get_temp(tz, &temperature);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
return sprintf(buf, "%ld\n", temperature);
|
|
}
|
|
|
|
static ssize_t
|
|
temp_crit_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct thermal_hwmon_attr *hwmon_attr
|
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= container_of(attr, struct thermal_hwmon_attr, attr);
|
|
struct thermal_zone_device *tz
|
|
= container_of(hwmon_attr, struct thermal_zone_device,
|
|
temp_crit);
|
|
long temperature;
|
|
int ret;
|
|
|
|
ret = tz->ops->get_trip_temp(tz, 0, &temperature);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return sprintf(buf, "%ld\n", temperature);
|
|
}
|
|
|
|
|
|
static int
|
|
thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
|
|
{
|
|
struct thermal_hwmon_device *hwmon;
|
|
int new_hwmon_device = 1;
|
|
int result;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(hwmon, &thermal_hwmon_list, node)
|
|
if (!strcmp(hwmon->type, tz->type)) {
|
|
new_hwmon_device = 0;
|
|
mutex_unlock(&thermal_list_lock);
|
|
goto register_sys_interface;
|
|
}
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
|
|
if (!hwmon)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&hwmon->tz_list);
|
|
strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
|
|
hwmon->device = hwmon_device_register(NULL);
|
|
if (IS_ERR(hwmon->device)) {
|
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result = PTR_ERR(hwmon->device);
|
|
goto free_mem;
|
|
}
|
|
hwmon->device->driver_data = hwmon;
|
|
result = device_create_file(hwmon->device, &dev_attr_name);
|
|
if (result)
|
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goto unregister_hwmon_device;
|
|
|
|
register_sys_interface:
|
|
tz->hwmon = hwmon;
|
|
hwmon->count++;
|
|
|
|
snprintf(tz->temp_input.name, THERMAL_NAME_LENGTH,
|
|
"temp%d_input", hwmon->count);
|
|
tz->temp_input.attr.attr.name = tz->temp_input.name;
|
|
tz->temp_input.attr.attr.mode = 0444;
|
|
tz->temp_input.attr.show = temp_input_show;
|
|
result = device_create_file(hwmon->device, &tz->temp_input.attr);
|
|
if (result)
|
|
goto unregister_hwmon_device;
|
|
|
|
if (tz->ops->get_crit_temp) {
|
|
unsigned long temperature;
|
|
if (!tz->ops->get_crit_temp(tz, &temperature)) {
|
|
snprintf(tz->temp_crit.name, THERMAL_NAME_LENGTH,
|
|
"temp%d_crit", hwmon->count);
|
|
tz->temp_crit.attr.attr.name = tz->temp_crit.name;
|
|
tz->temp_crit.attr.attr.mode = 0444;
|
|
tz->temp_crit.attr.show = temp_crit_show;
|
|
result = device_create_file(hwmon->device,
|
|
&tz->temp_crit.attr);
|
|
if (result)
|
|
goto unregister_hwmon_device;
|
|
}
|
|
}
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
if (new_hwmon_device)
|
|
list_add_tail(&hwmon->node, &thermal_hwmon_list);
|
|
list_add_tail(&tz->hwmon_node, &hwmon->tz_list);
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
return 0;
|
|
|
|
unregister_hwmon_device:
|
|
device_remove_file(hwmon->device, &tz->temp_crit.attr);
|
|
device_remove_file(hwmon->device, &tz->temp_input.attr);
|
|
if (new_hwmon_device) {
|
|
device_remove_file(hwmon->device, &dev_attr_name);
|
|
hwmon_device_unregister(hwmon->device);
|
|
}
|
|
free_mem:
|
|
if (new_hwmon_device)
|
|
kfree(hwmon);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void
|
|
thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
|
|
{
|
|
struct thermal_hwmon_device *hwmon = tz->hwmon;
|
|
|
|
tz->hwmon = NULL;
|
|
device_remove_file(hwmon->device, &tz->temp_input.attr);
|
|
device_remove_file(hwmon->device, &tz->temp_crit.attr);
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_del(&tz->hwmon_node);
|
|
if (!list_empty(&hwmon->tz_list)) {
|
|
mutex_unlock(&thermal_list_lock);
|
|
return;
|
|
}
|
|
list_del(&hwmon->node);
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
device_remove_file(hwmon->device, &dev_attr_name);
|
|
hwmon_device_unregister(hwmon->device);
|
|
kfree(hwmon);
|
|
}
|
|
#else
|
|
static int
|
|
thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
|
|
int delay)
|
|
{
|
|
cancel_delayed_work(&(tz->poll_queue));
|
|
|
|
if (!delay)
|
|
return;
|
|
|
|
if (delay > 1000)
|
|
schedule_delayed_work(&(tz->poll_queue),
|
|
round_jiffies(msecs_to_jiffies(delay)));
|
|
else
|
|
schedule_delayed_work(&(tz->poll_queue),
|
|
msecs_to_jiffies(delay));
|
|
}
|
|
|
|
static void thermal_zone_device_passive(struct thermal_zone_device *tz,
|
|
int temp, int trip_temp, int trip)
|
|
{
|
|
int trend = 0;
|
|
struct thermal_cooling_device_instance *instance;
|
|
struct thermal_cooling_device *cdev;
|
|
long state, max_state;
|
|
|
|
/*
|
|
* Above Trip?
|
|
* -----------
|
|
* Calculate the thermal trend (using the passive cooling equation)
|
|
* and modify the performance limit for all passive cooling devices
|
|
* accordingly. Note that we assume symmetry.
|
|
*/
|
|
if (temp >= trip_temp) {
|
|
tz->passive = true;
|
|
|
|
trend = (tz->tc1 * (temp - tz->last_temperature)) +
|
|
(tz->tc2 * (temp - trip_temp));
|
|
|
|
/* Heating up? */
|
|
if (trend > 0) {
|
|
list_for_each_entry(instance, &tz->cooling_devices,
|
|
node) {
|
|
if (instance->trip != trip)
|
|
continue;
|
|
cdev = instance->cdev;
|
|
cdev->ops->get_cur_state(cdev, &state);
|
|
cdev->ops->get_max_state(cdev, &max_state);
|
|
if (state++ < max_state)
|
|
cdev->ops->set_cur_state(cdev, state);
|
|
}
|
|
} else if (trend < 0) { /* Cooling off? */
|
|
list_for_each_entry(instance, &tz->cooling_devices,
|
|
node) {
|
|
if (instance->trip != trip)
|
|
continue;
|
|
cdev = instance->cdev;
|
|
cdev->ops->get_cur_state(cdev, &state);
|
|
cdev->ops->get_max_state(cdev, &max_state);
|
|
if (state > 0)
|
|
cdev->ops->set_cur_state(cdev, --state);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Below Trip?
|
|
* -----------
|
|
* Implement passive cooling hysteresis to slowly increase performance
|
|
* and avoid thrashing around the passive trip point. Note that we
|
|
* assume symmetry.
|
|
*/
|
|
list_for_each_entry(instance, &tz->cooling_devices, node) {
|
|
if (instance->trip != trip)
|
|
continue;
|
|
cdev = instance->cdev;
|
|
cdev->ops->get_cur_state(cdev, &state);
|
|
cdev->ops->get_max_state(cdev, &max_state);
|
|
if (state > 0)
|
|
cdev->ops->set_cur_state(cdev, --state);
|
|
if (state == 0)
|
|
tz->passive = false;
|
|
}
|
|
}
|
|
|
|
static void thermal_zone_device_check(struct work_struct *work)
|
|
{
|
|
struct thermal_zone_device *tz = container_of(work, struct
|
|
thermal_zone_device,
|
|
poll_queue.work);
|
|
thermal_zone_device_update(tz);
|
|
}
|
|
|
|
/**
|
|
* thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
|
|
* @tz: thermal zone device
|
|
* @trip: indicates which trip point the cooling devices is
|
|
* associated with in this thermal zone.
|
|
* @cdev: thermal cooling device
|
|
*
|
|
* This function is usually called in the thermal zone device .bind callback.
|
|
*/
|
|
int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
|
|
int trip,
|
|
struct thermal_cooling_device *cdev)
|
|
{
|
|
struct thermal_cooling_device_instance *dev;
|
|
struct thermal_cooling_device_instance *pos;
|
|
struct thermal_zone_device *pos1;
|
|
struct thermal_cooling_device *pos2;
|
|
int result;
|
|
|
|
if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
|
|
return -EINVAL;
|
|
|
|
list_for_each_entry(pos1, &thermal_tz_list, node) {
|
|
if (pos1 == tz)
|
|
break;
|
|
}
|
|
list_for_each_entry(pos2, &thermal_cdev_list, node) {
|
|
if (pos2 == cdev)
|
|
break;
|
|
}
|
|
|
|
if (tz != pos1 || cdev != pos2)
|
|
return -EINVAL;
|
|
|
|
dev =
|
|
kzalloc(sizeof(struct thermal_cooling_device_instance), GFP_KERNEL);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
dev->tz = tz;
|
|
dev->cdev = cdev;
|
|
dev->trip = trip;
|
|
result = get_idr(&tz->idr, &tz->lock, &dev->id);
|
|
if (result)
|
|
goto free_mem;
|
|
|
|
sprintf(dev->name, "cdev%d", dev->id);
|
|
result =
|
|
sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
|
|
if (result)
|
|
goto release_idr;
|
|
|
|
sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
|
|
dev->attr.attr.name = dev->attr_name;
|
|
dev->attr.attr.mode = 0444;
|
|
dev->attr.show = thermal_cooling_device_trip_point_show;
|
|
result = device_create_file(&tz->device, &dev->attr);
|
|
if (result)
|
|
goto remove_symbol_link;
|
|
|
|
mutex_lock(&tz->lock);
|
|
list_for_each_entry(pos, &tz->cooling_devices, node)
|
|
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
|
|
result = -EEXIST;
|
|
break;
|
|
}
|
|
if (!result)
|
|
list_add_tail(&dev->node, &tz->cooling_devices);
|
|
mutex_unlock(&tz->lock);
|
|
|
|
if (!result)
|
|
return 0;
|
|
|
|
device_remove_file(&tz->device, &dev->attr);
|
|
remove_symbol_link:
|
|
sysfs_remove_link(&tz->device.kobj, dev->name);
|
|
release_idr:
|
|
release_idr(&tz->idr, &tz->lock, dev->id);
|
|
free_mem:
|
|
kfree(dev);
|
|
return result;
|
|
}
|
|
|
|
EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
|
|
|
|
/**
|
|
* thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
|
|
* @tz: thermal zone device
|
|
* @trip: indicates which trip point the cooling devices is
|
|
* associated with in this thermal zone.
|
|
* @cdev: thermal cooling device
|
|
*
|
|
* This function is usually called in the thermal zone device .unbind callback.
|
|
*/
|
|
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
|
|
int trip,
|
|
struct thermal_cooling_device *cdev)
|
|
{
|
|
struct thermal_cooling_device_instance *pos, *next;
|
|
|
|
mutex_lock(&tz->lock);
|
|
list_for_each_entry_safe(pos, next, &tz->cooling_devices, node) {
|
|
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
|
|
list_del(&pos->node);
|
|
mutex_unlock(&tz->lock);
|
|
goto unbind;
|
|
}
|
|
}
|
|
mutex_unlock(&tz->lock);
|
|
|
|
return -ENODEV;
|
|
|
|
unbind:
|
|
device_remove_file(&tz->device, &pos->attr);
|
|
sysfs_remove_link(&tz->device.kobj, pos->name);
|
|
release_idr(&tz->idr, &tz->lock, pos->id);
|
|
kfree(pos);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
|
|
|
|
static void thermal_release(struct device *dev)
|
|
{
|
|
struct thermal_zone_device *tz;
|
|
struct thermal_cooling_device *cdev;
|
|
|
|
if (!strncmp(dev_name(dev), "thermal_zone", sizeof "thermal_zone" - 1)) {
|
|
tz = to_thermal_zone(dev);
|
|
kfree(tz);
|
|
} else {
|
|
cdev = to_cooling_device(dev);
|
|
kfree(cdev);
|
|
}
|
|
}
|
|
|
|
static struct class thermal_class = {
|
|
.name = "thermal",
|
|
.dev_release = thermal_release,
|
|
};
|
|
|
|
/**
|
|
* thermal_cooling_device_register - register a new thermal cooling device
|
|
* @type: the thermal cooling device type.
|
|
* @devdata: device private data.
|
|
* @ops: standard thermal cooling devices callbacks.
|
|
*/
|
|
struct thermal_cooling_device *thermal_cooling_device_register(char *type,
|
|
void *devdata,
|
|
struct
|
|
thermal_cooling_device_ops
|
|
*ops)
|
|
{
|
|
struct thermal_cooling_device *cdev;
|
|
struct thermal_zone_device *pos;
|
|
int result;
|
|
|
|
if (strlen(type) >= THERMAL_NAME_LENGTH)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!ops || !ops->get_max_state || !ops->get_cur_state ||
|
|
!ops->set_cur_state)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
|
|
if (!cdev)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
|
|
if (result) {
|
|
kfree(cdev);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
strcpy(cdev->type, type);
|
|
cdev->ops = ops;
|
|
cdev->device.class = &thermal_class;
|
|
cdev->devdata = devdata;
|
|
dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
|
|
result = device_register(&cdev->device);
|
|
if (result) {
|
|
release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
|
|
kfree(cdev);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
/* sys I/F */
|
|
if (type) {
|
|
result = device_create_file(&cdev->device, &dev_attr_cdev_type);
|
|
if (result)
|
|
goto unregister;
|
|
}
|
|
|
|
result = device_create_file(&cdev->device, &dev_attr_max_state);
|
|
if (result)
|
|
goto unregister;
|
|
|
|
result = device_create_file(&cdev->device, &dev_attr_cur_state);
|
|
if (result)
|
|
goto unregister;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_add(&cdev->node, &thermal_cdev_list);
|
|
list_for_each_entry(pos, &thermal_tz_list, node) {
|
|
if (!pos->ops->bind)
|
|
continue;
|
|
result = pos->ops->bind(pos, cdev);
|
|
if (result)
|
|
break;
|
|
|
|
}
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
if (!result)
|
|
return cdev;
|
|
|
|
unregister:
|
|
release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
|
|
device_unregister(&cdev->device);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
EXPORT_SYMBOL(thermal_cooling_device_register);
|
|
|
|
/**
|
|
* thermal_cooling_device_unregister - removes the registered thermal cooling device
|
|
* @cdev: the thermal cooling device to remove.
|
|
*
|
|
* thermal_cooling_device_unregister() must be called when the device is no
|
|
* longer needed.
|
|
*/
|
|
void thermal_cooling_device_unregister(struct
|
|
thermal_cooling_device
|
|
*cdev)
|
|
{
|
|
struct thermal_zone_device *tz;
|
|
struct thermal_cooling_device *pos = NULL;
|
|
|
|
if (!cdev)
|
|
return;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(pos, &thermal_cdev_list, node)
|
|
if (pos == cdev)
|
|
break;
|
|
if (pos != cdev) {
|
|
/* thermal cooling device not found */
|
|
mutex_unlock(&thermal_list_lock);
|
|
return;
|
|
}
|
|
list_del(&cdev->node);
|
|
list_for_each_entry(tz, &thermal_tz_list, node) {
|
|
if (!tz->ops->unbind)
|
|
continue;
|
|
tz->ops->unbind(tz, cdev);
|
|
}
|
|
mutex_unlock(&thermal_list_lock);
|
|
if (cdev->type[0])
|
|
device_remove_file(&cdev->device, &dev_attr_cdev_type);
|
|
device_remove_file(&cdev->device, &dev_attr_max_state);
|
|
device_remove_file(&cdev->device, &dev_attr_cur_state);
|
|
|
|
release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
|
|
device_unregister(&cdev->device);
|
|
return;
|
|
}
|
|
|
|
EXPORT_SYMBOL(thermal_cooling_device_unregister);
|
|
|
|
/**
|
|
* thermal_zone_device_update - force an update of a thermal zone's state
|
|
* @ttz: the thermal zone to update
|
|
*/
|
|
|
|
void thermal_zone_device_update(struct thermal_zone_device *tz)
|
|
{
|
|
int count, ret = 0;
|
|
long temp, trip_temp;
|
|
enum thermal_trip_type trip_type;
|
|
struct thermal_cooling_device_instance *instance;
|
|
struct thermal_cooling_device *cdev;
|
|
|
|
mutex_lock(&tz->lock);
|
|
|
|
tz->ops->get_temp(tz, &temp);
|
|
|
|
for (count = 0; count < tz->trips; count++) {
|
|
tz->ops->get_trip_type(tz, count, &trip_type);
|
|
tz->ops->get_trip_temp(tz, count, &trip_temp);
|
|
|
|
switch (trip_type) {
|
|
case THERMAL_TRIP_CRITICAL:
|
|
if (temp >= trip_temp) {
|
|
if (tz->ops->notify)
|
|
ret = tz->ops->notify(tz, count,
|
|
trip_type);
|
|
if (!ret) {
|
|
printk(KERN_EMERG
|
|
"Critical temperature reached (%ld C), shutting down.\n",
|
|
temp/1000);
|
|
orderly_poweroff(true);
|
|
}
|
|
}
|
|
break;
|
|
case THERMAL_TRIP_HOT:
|
|
if (temp >= trip_temp)
|
|
if (tz->ops->notify)
|
|
tz->ops->notify(tz, count, trip_type);
|
|
break;
|
|
case THERMAL_TRIP_ACTIVE:
|
|
list_for_each_entry(instance, &tz->cooling_devices,
|
|
node) {
|
|
if (instance->trip != count)
|
|
continue;
|
|
|
|
cdev = instance->cdev;
|
|
|
|
if (temp >= trip_temp)
|
|
cdev->ops->set_cur_state(cdev, 1);
|
|
else
|
|
cdev->ops->set_cur_state(cdev, 0);
|
|
}
|
|
break;
|
|
case THERMAL_TRIP_PASSIVE:
|
|
if (temp >= trip_temp || tz->passive)
|
|
thermal_zone_device_passive(tz, temp,
|
|
trip_temp, count);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (tz->forced_passive)
|
|
thermal_zone_device_passive(tz, temp, tz->forced_passive,
|
|
THERMAL_TRIPS_NONE);
|
|
|
|
tz->last_temperature = temp;
|
|
if (tz->passive)
|
|
thermal_zone_device_set_polling(tz, tz->passive_delay);
|
|
else if (tz->polling_delay)
|
|
thermal_zone_device_set_polling(tz, tz->polling_delay);
|
|
mutex_unlock(&tz->lock);
|
|
}
|
|
EXPORT_SYMBOL(thermal_zone_device_update);
|
|
|
|
/**
|
|
* thermal_zone_device_register - register a new thermal zone device
|
|
* @type: the thermal zone device type
|
|
* @trips: the number of trip points the thermal zone support
|
|
* @devdata: private device data
|
|
* @ops: standard thermal zone device callbacks
|
|
* @tc1: thermal coefficient 1 for passive calculations
|
|
* @tc2: thermal coefficient 2 for passive calculations
|
|
* @passive_delay: number of milliseconds to wait between polls when
|
|
* performing passive cooling
|
|
* @polling_delay: number of milliseconds to wait between polls when checking
|
|
* whether trip points have been crossed (0 for interrupt
|
|
* driven systems)
|
|
*
|
|
* thermal_zone_device_unregister() must be called when the device is no
|
|
* longer needed. The passive cooling formula uses tc1 and tc2 as described in
|
|
* section 11.1.5.1 of the ACPI specification 3.0.
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*/
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struct thermal_zone_device *thermal_zone_device_register(char *type,
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int trips,
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void *devdata, struct
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thermal_zone_device_ops
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*ops, int tc1, int
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tc2,
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int passive_delay,
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int polling_delay)
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{
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struct thermal_zone_device *tz;
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struct thermal_cooling_device *pos;
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enum thermal_trip_type trip_type;
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int result;
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int count;
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int passive = 0;
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if (strlen(type) >= THERMAL_NAME_LENGTH)
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return ERR_PTR(-EINVAL);
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if (trips > THERMAL_MAX_TRIPS || trips < 0)
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return ERR_PTR(-EINVAL);
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if (!ops || !ops->get_temp)
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return ERR_PTR(-EINVAL);
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tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
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if (!tz)
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return ERR_PTR(-ENOMEM);
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INIT_LIST_HEAD(&tz->cooling_devices);
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idr_init(&tz->idr);
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mutex_init(&tz->lock);
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result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
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if (result) {
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kfree(tz);
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return ERR_PTR(result);
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}
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strcpy(tz->type, type);
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tz->ops = ops;
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tz->device.class = &thermal_class;
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tz->devdata = devdata;
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tz->trips = trips;
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tz->tc1 = tc1;
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tz->tc2 = tc2;
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tz->passive_delay = passive_delay;
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tz->polling_delay = polling_delay;
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dev_set_name(&tz->device, "thermal_zone%d", tz->id);
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result = device_register(&tz->device);
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if (result) {
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release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
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kfree(tz);
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return ERR_PTR(result);
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}
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/* sys I/F */
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if (type) {
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result = device_create_file(&tz->device, &dev_attr_type);
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if (result)
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goto unregister;
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}
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result = device_create_file(&tz->device, &dev_attr_temp);
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if (result)
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goto unregister;
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if (ops->get_mode) {
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result = device_create_file(&tz->device, &dev_attr_mode);
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if (result)
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goto unregister;
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}
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for (count = 0; count < trips; count++) {
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TRIP_POINT_ATTR_ADD(&tz->device, count, result);
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if (result)
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goto unregister;
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tz->ops->get_trip_type(tz, count, &trip_type);
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if (trip_type == THERMAL_TRIP_PASSIVE)
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passive = 1;
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}
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if (!passive)
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result = device_create_file(&tz->device,
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&dev_attr_passive);
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if (result)
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goto unregister;
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result = thermal_add_hwmon_sysfs(tz);
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if (result)
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goto unregister;
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mutex_lock(&thermal_list_lock);
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list_add_tail(&tz->node, &thermal_tz_list);
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if (ops->bind)
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list_for_each_entry(pos, &thermal_cdev_list, node) {
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result = ops->bind(tz, pos);
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if (result)
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break;
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}
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mutex_unlock(&thermal_list_lock);
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INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
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thermal_zone_device_update(tz);
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if (!result)
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return tz;
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unregister:
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release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
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device_unregister(&tz->device);
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return ERR_PTR(result);
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}
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EXPORT_SYMBOL(thermal_zone_device_register);
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/**
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* thermal_device_unregister - removes the registered thermal zone device
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* @tz: the thermal zone device to remove
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*/
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void thermal_zone_device_unregister(struct thermal_zone_device *tz)
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{
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struct thermal_cooling_device *cdev;
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struct thermal_zone_device *pos = NULL;
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int count;
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if (!tz)
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return;
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mutex_lock(&thermal_list_lock);
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list_for_each_entry(pos, &thermal_tz_list, node)
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if (pos == tz)
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break;
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if (pos != tz) {
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/* thermal zone device not found */
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mutex_unlock(&thermal_list_lock);
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return;
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}
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list_del(&tz->node);
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if (tz->ops->unbind)
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list_for_each_entry(cdev, &thermal_cdev_list, node)
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tz->ops->unbind(tz, cdev);
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mutex_unlock(&thermal_list_lock);
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thermal_zone_device_set_polling(tz, 0);
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if (tz->type[0])
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device_remove_file(&tz->device, &dev_attr_type);
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device_remove_file(&tz->device, &dev_attr_temp);
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if (tz->ops->get_mode)
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device_remove_file(&tz->device, &dev_attr_mode);
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for (count = 0; count < tz->trips; count++)
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TRIP_POINT_ATTR_REMOVE(&tz->device, count);
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thermal_remove_hwmon_sysfs(tz);
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release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
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idr_destroy(&tz->idr);
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mutex_destroy(&tz->lock);
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device_unregister(&tz->device);
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return;
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}
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EXPORT_SYMBOL(thermal_zone_device_unregister);
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static int __init thermal_init(void)
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{
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int result = 0;
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result = class_register(&thermal_class);
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if (result) {
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idr_destroy(&thermal_tz_idr);
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idr_destroy(&thermal_cdev_idr);
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mutex_destroy(&thermal_idr_lock);
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mutex_destroy(&thermal_list_lock);
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}
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return result;
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}
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static void __exit thermal_exit(void)
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{
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class_unregister(&thermal_class);
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idr_destroy(&thermal_tz_idr);
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idr_destroy(&thermal_cdev_idr);
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mutex_destroy(&thermal_idr_lock);
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mutex_destroy(&thermal_list_lock);
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}
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subsys_initcall(thermal_init);
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module_exit(thermal_exit);
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