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![Zhang Rui](/assets/img/avatar_default.png)
This patch does a cleanup about the thermal zone govenor, setting and make the following rule. 1. For thermal zone devices that are registered w/o tz->tzp, they can use the default thermal governor only. 2. For thermal zone devices w/ governor name specified in tz->tzp->governor_name, we will use the default govenor if the governor specified is not available at the moment, and update tz->governor when the matched governor is registered. This also fixes a problem that OF registered thermal zones are running with no governor. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Acked-by: Javi Merino <javi.merino@arm.com>
1854 lines
47 KiB
C
1854 lines
47 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/slab.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/reboot.h>
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#include <linux/string.h>
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#include <linux/of.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include "thermal_core.h"
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#include "thermal_hwmon.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 v2");
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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 LIST_HEAD(thermal_governor_list);
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static DEFINE_MUTEX(thermal_list_lock);
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static DEFINE_MUTEX(thermal_governor_lock);
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static struct thermal_governor *def_governor;
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static struct thermal_governor *__find_governor(const char *name)
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{
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struct thermal_governor *pos;
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if (!name || !name[0])
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return def_governor;
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list_for_each_entry(pos, &thermal_governor_list, governor_list)
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if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
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return pos;
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return NULL;
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}
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int thermal_register_governor(struct thermal_governor *governor)
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{
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int err;
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const char *name;
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struct thermal_zone_device *pos;
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if (!governor)
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return -EINVAL;
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mutex_lock(&thermal_governor_lock);
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err = -EBUSY;
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if (__find_governor(governor->name) == NULL) {
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err = 0;
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list_add(&governor->governor_list, &thermal_governor_list);
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if (!def_governor && !strncmp(governor->name,
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DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
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def_governor = governor;
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}
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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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/*
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* only thermal zones with specified tz->tzp->governor_name
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* may run with tz->govenor unset
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*/
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if (pos->governor)
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continue;
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name = pos->tzp->governor_name;
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if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
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pos->governor = governor;
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}
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mutex_unlock(&thermal_list_lock);
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mutex_unlock(&thermal_governor_lock);
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return err;
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}
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void thermal_unregister_governor(struct thermal_governor *governor)
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{
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struct thermal_zone_device *pos;
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if (!governor)
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return;
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mutex_lock(&thermal_governor_lock);
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if (__find_governor(governor->name) == NULL)
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goto exit;
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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 (!strnicmp(pos->governor->name, governor->name,
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THERMAL_NAME_LENGTH))
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pos->governor = NULL;
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}
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mutex_unlock(&thermal_list_lock);
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list_del(&governor->governor_list);
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exit:
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mutex_unlock(&thermal_governor_lock);
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return;
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}
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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 ret;
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if (lock)
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mutex_lock(lock);
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ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
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if (lock)
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mutex_unlock(lock);
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if (unlikely(ret < 0))
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return ret;
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*id = ret;
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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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int get_tz_trend(struct thermal_zone_device *tz, int trip)
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{
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enum thermal_trend trend;
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if (tz->emul_temperature || !tz->ops->get_trend ||
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tz->ops->get_trend(tz, trip, &trend)) {
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if (tz->temperature > tz->last_temperature)
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trend = THERMAL_TREND_RAISING;
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else if (tz->temperature < tz->last_temperature)
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trend = THERMAL_TREND_DROPPING;
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else
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trend = THERMAL_TREND_STABLE;
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}
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return trend;
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}
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EXPORT_SYMBOL(get_tz_trend);
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struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev, int trip)
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{
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struct thermal_instance *pos = NULL;
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struct thermal_instance *target_instance = NULL;
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mutex_lock(&tz->lock);
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mutex_lock(&cdev->lock);
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list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
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if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
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target_instance = pos;
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break;
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}
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}
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mutex_unlock(&cdev->lock);
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mutex_unlock(&tz->lock);
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return target_instance;
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}
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EXPORT_SYMBOL(get_thermal_instance);
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static void print_bind_err_msg(struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev, int ret)
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{
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dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
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tz->type, cdev->type, ret);
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}
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static void __bind(struct thermal_zone_device *tz, int mask,
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struct thermal_cooling_device *cdev,
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unsigned long *limits)
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{
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int i, ret;
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for (i = 0; i < tz->trips; i++) {
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if (mask & (1 << i)) {
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unsigned long upper, lower;
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upper = THERMAL_NO_LIMIT;
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lower = THERMAL_NO_LIMIT;
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if (limits) {
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lower = limits[i * 2];
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upper = limits[i * 2 + 1];
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}
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ret = thermal_zone_bind_cooling_device(tz, i, cdev,
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upper, lower);
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if (ret)
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print_bind_err_msg(tz, cdev, ret);
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}
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}
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}
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static void __unbind(struct thermal_zone_device *tz, int mask,
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struct thermal_cooling_device *cdev)
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{
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int i;
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for (i = 0; i < tz->trips; i++)
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if (mask & (1 << i))
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thermal_zone_unbind_cooling_device(tz, i, cdev);
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}
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static void bind_cdev(struct thermal_cooling_device *cdev)
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{
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int i, ret;
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const struct thermal_zone_params *tzp;
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struct thermal_zone_device *pos = NULL;
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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->tzp && !pos->ops->bind)
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continue;
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if (pos->ops->bind) {
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ret = pos->ops->bind(pos, cdev);
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if (ret)
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print_bind_err_msg(pos, cdev, ret);
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continue;
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}
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tzp = pos->tzp;
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if (!tzp || !tzp->tbp)
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continue;
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for (i = 0; i < tzp->num_tbps; i++) {
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if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
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continue;
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if (tzp->tbp[i].match(pos, cdev))
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continue;
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tzp->tbp[i].cdev = cdev;
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__bind(pos, tzp->tbp[i].trip_mask, cdev,
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tzp->tbp[i].binding_limits);
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}
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}
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mutex_unlock(&thermal_list_lock);
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}
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static void bind_tz(struct thermal_zone_device *tz)
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{
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int i, ret;
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struct thermal_cooling_device *pos = NULL;
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const struct thermal_zone_params *tzp = tz->tzp;
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if (!tzp && !tz->ops->bind)
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return;
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mutex_lock(&thermal_list_lock);
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/* If there is ops->bind, try to use ops->bind */
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if (tz->ops->bind) {
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list_for_each_entry(pos, &thermal_cdev_list, node) {
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ret = tz->ops->bind(tz, pos);
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if (ret)
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print_bind_err_msg(tz, pos, ret);
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}
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goto exit;
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}
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if (!tzp || !tzp->tbp)
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goto exit;
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list_for_each_entry(pos, &thermal_cdev_list, node) {
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for (i = 0; i < tzp->num_tbps; i++) {
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if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
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continue;
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if (tzp->tbp[i].match(tz, pos))
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continue;
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tzp->tbp[i].cdev = pos;
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__bind(tz, tzp->tbp[i].trip_mask, pos,
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tzp->tbp[i].binding_limits);
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}
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}
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exit:
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mutex_unlock(&thermal_list_lock);
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}
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static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
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int delay)
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{
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if (delay > 1000)
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mod_delayed_work(system_freezable_wq, &tz->poll_queue,
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round_jiffies(msecs_to_jiffies(delay)));
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else if (delay)
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mod_delayed_work(system_freezable_wq, &tz->poll_queue,
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msecs_to_jiffies(delay));
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else
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cancel_delayed_work(&tz->poll_queue);
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}
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static void monitor_thermal_zone(struct thermal_zone_device *tz)
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{
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mutex_lock(&tz->lock);
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if (tz->passive)
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thermal_zone_device_set_polling(tz, tz->passive_delay);
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else if (tz->polling_delay)
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thermal_zone_device_set_polling(tz, tz->polling_delay);
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else
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thermal_zone_device_set_polling(tz, 0);
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mutex_unlock(&tz->lock);
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}
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static void handle_non_critical_trips(struct thermal_zone_device *tz,
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int trip, enum thermal_trip_type trip_type)
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{
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tz->governor ? tz->governor->throttle(tz, trip) :
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def_governor->throttle(tz, trip);
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}
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static void handle_critical_trips(struct thermal_zone_device *tz,
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int trip, enum thermal_trip_type trip_type)
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{
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long trip_temp;
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tz->ops->get_trip_temp(tz, trip, &trip_temp);
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/* If we have not crossed the trip_temp, we do not care. */
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if (tz->temperature < trip_temp)
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return;
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if (tz->ops->notify)
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tz->ops->notify(tz, trip, trip_type);
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if (trip_type == THERMAL_TRIP_CRITICAL) {
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dev_emerg(&tz->device,
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"critical temperature reached(%d C),shutting down\n",
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tz->temperature / 1000);
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orderly_poweroff(true);
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}
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}
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static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
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{
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enum thermal_trip_type type;
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tz->ops->get_trip_type(tz, trip, &type);
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if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
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handle_critical_trips(tz, trip, type);
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else
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handle_non_critical_trips(tz, trip, type);
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/*
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* Alright, we handled this trip successfully.
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* So, start monitoring again.
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*/
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monitor_thermal_zone(tz);
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}
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/**
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* thermal_zone_get_temp() - returns its the temperature of thermal zone
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* @tz: a valid pointer to a struct thermal_zone_device
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* @temp: a valid pointer to where to store the resulting temperature.
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*
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* When a valid thermal zone reference is passed, it will fetch its
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* temperature and fill @temp.
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*
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* Return: On success returns 0, an error code otherwise
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*/
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int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
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{
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int ret = -EINVAL;
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#ifdef CONFIG_THERMAL_EMULATION
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int count;
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unsigned long crit_temp = -1UL;
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enum thermal_trip_type type;
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#endif
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if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
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goto exit;
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mutex_lock(&tz->lock);
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ret = tz->ops->get_temp(tz, temp);
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#ifdef CONFIG_THERMAL_EMULATION
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if (!tz->emul_temperature)
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goto skip_emul;
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for (count = 0; count < tz->trips; count++) {
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ret = tz->ops->get_trip_type(tz, count, &type);
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if (!ret && type == THERMAL_TRIP_CRITICAL) {
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ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
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break;
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}
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}
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if (ret)
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goto skip_emul;
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|
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if (*temp < crit_temp)
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*temp = tz->emul_temperature;
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skip_emul:
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#endif
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mutex_unlock(&tz->lock);
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exit:
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return ret;
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}
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EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
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|
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static void update_temperature(struct thermal_zone_device *tz)
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{
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long temp;
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int ret;
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ret = thermal_zone_get_temp(tz, &temp);
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if (ret) {
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dev_warn(&tz->device, "failed to read out thermal zone %d\n",
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tz->id);
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return;
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}
|
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|
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mutex_lock(&tz->lock);
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tz->last_temperature = tz->temperature;
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tz->temperature = temp;
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mutex_unlock(&tz->lock);
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|
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dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
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tz->last_temperature, tz->temperature);
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}
|
|
|
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void thermal_zone_device_update(struct thermal_zone_device *tz)
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{
|
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int count;
|
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|
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if (!tz->ops->get_temp)
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return;
|
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|
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update_temperature(tz);
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|
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for (count = 0; count < tz->trips; count++)
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handle_thermal_trip(tz, count);
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}
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EXPORT_SYMBOL_GPL(thermal_zone_device_update);
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|
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static void thermal_zone_device_check(struct work_struct *work)
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{
|
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struct thermal_zone_device *tz = container_of(work, struct
|
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thermal_zone_device,
|
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poll_queue.work);
|
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thermal_zone_device_update(tz);
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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)
|
|
|
|
static ssize_t
|
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type_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
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struct thermal_zone_device *tz = to_thermal_zone(dev);
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|
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return sprintf(buf, "%s\n", tz->type);
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}
|
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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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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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|
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ret = thermal_zone_get_temp(tz, &temperature);
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|
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if (ret)
|
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return ret;
|
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|
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return sprintf(buf, "%ld\n", temperature);
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}
|
|
|
|
static ssize_t
|
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mode_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
enum thermal_device_mode mode;
|
|
int result;
|
|
|
|
if (!tz->ops->get_mode)
|
|
return -EPERM;
|
|
|
|
result = tz->ops->get_mode(tz, &mode);
|
|
if (result)
|
|
return result;
|
|
|
|
return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
|
|
: "disabled");
|
|
}
|
|
|
|
static ssize_t
|
|
mode_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
int result;
|
|
|
|
if (!tz->ops->set_mode)
|
|
return -EPERM;
|
|
|
|
if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
|
|
result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
|
|
else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
|
|
result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
|
|
else
|
|
result = -EINVAL;
|
|
|
|
if (result)
|
|
return result;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t
|
|
trip_point_type_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
enum thermal_trip_type type;
|
|
int trip, result;
|
|
|
|
if (!tz->ops->get_trip_type)
|
|
return -EPERM;
|
|
|
|
if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
|
|
return -EINVAL;
|
|
|
|
result = tz->ops->get_trip_type(tz, trip, &type);
|
|
if (result)
|
|
return result;
|
|
|
|
switch (type) {
|
|
case THERMAL_TRIP_CRITICAL:
|
|
return sprintf(buf, "critical\n");
|
|
case THERMAL_TRIP_HOT:
|
|
return sprintf(buf, "hot\n");
|
|
case THERMAL_TRIP_PASSIVE:
|
|
return sprintf(buf, "passive\n");
|
|
case THERMAL_TRIP_ACTIVE:
|
|
return sprintf(buf, "active\n");
|
|
default:
|
|
return sprintf(buf, "unknown\n");
|
|
}
|
|
}
|
|
|
|
static ssize_t
|
|
trip_point_temp_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
int trip, ret;
|
|
unsigned long temperature;
|
|
|
|
if (!tz->ops->set_trip_temp)
|
|
return -EPERM;
|
|
|
|
if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
|
|
return -EINVAL;
|
|
|
|
if (kstrtoul(buf, 10, &temperature))
|
|
return -EINVAL;
|
|
|
|
ret = tz->ops->set_trip_temp(tz, trip, temperature);
|
|
|
|
return ret ? ret : count;
|
|
}
|
|
|
|
static ssize_t
|
|
trip_point_temp_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
int trip, ret;
|
|
long temperature;
|
|
|
|
if (!tz->ops->get_trip_temp)
|
|
return -EPERM;
|
|
|
|
if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
|
|
return -EINVAL;
|
|
|
|
ret = tz->ops->get_trip_temp(tz, trip, &temperature);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
return sprintf(buf, "%ld\n", temperature);
|
|
}
|
|
|
|
static ssize_t
|
|
trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
int trip, ret;
|
|
unsigned long temperature;
|
|
|
|
if (!tz->ops->set_trip_hyst)
|
|
return -EPERM;
|
|
|
|
if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
|
|
return -EINVAL;
|
|
|
|
if (kstrtoul(buf, 10, &temperature))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* We are not doing any check on the 'temperature' value
|
|
* here. The driver implementing 'set_trip_hyst' has to
|
|
* take care of this.
|
|
*/
|
|
ret = tz->ops->set_trip_hyst(tz, trip, temperature);
|
|
|
|
return ret ? ret : count;
|
|
}
|
|
|
|
static ssize_t
|
|
trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
int trip, ret;
|
|
unsigned long temperature;
|
|
|
|
if (!tz->ops->get_trip_hyst)
|
|
return -EPERM;
|
|
|
|
if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
|
|
return -EINVAL;
|
|
|
|
ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
|
|
|
|
return ret ? ret : sprintf(buf, "%ld\n", temperature);
|
|
}
|
|
|
|
static ssize_t
|
|
passive_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
struct thermal_cooling_device *cdev = NULL;
|
|
int state;
|
|
|
|
if (!sscanf(buf, "%d\n", &state))
|
|
return -EINVAL;
|
|
|
|
/* sanity check: values below 1000 millicelcius don't make sense
|
|
* and can cause the system to go into a thermal heart attack
|
|
*/
|
|
if (state && state < 1000)
|
|
return -EINVAL;
|
|
|
|
if (state && !tz->forced_passive) {
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(cdev, &thermal_cdev_list, node) {
|
|
if (!strncmp("Processor", cdev->type,
|
|
sizeof("Processor")))
|
|
thermal_zone_bind_cooling_device(tz,
|
|
THERMAL_TRIPS_NONE, cdev,
|
|
THERMAL_NO_LIMIT,
|
|
THERMAL_NO_LIMIT);
|
|
}
|
|
mutex_unlock(&thermal_list_lock);
|
|
if (!tz->passive_delay)
|
|
tz->passive_delay = 1000;
|
|
} else if (!state && tz->forced_passive) {
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(cdev, &thermal_cdev_list, node) {
|
|
if (!strncmp("Processor", cdev->type,
|
|
sizeof("Processor")))
|
|
thermal_zone_unbind_cooling_device(tz,
|
|
THERMAL_TRIPS_NONE,
|
|
cdev);
|
|
}
|
|
mutex_unlock(&thermal_list_lock);
|
|
tz->passive_delay = 0;
|
|
}
|
|
|
|
tz->forced_passive = state;
|
|
|
|
thermal_zone_device_update(tz);
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t
|
|
passive_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
|
|
return sprintf(buf, "%d\n", tz->forced_passive);
|
|
}
|
|
|
|
static ssize_t
|
|
policy_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
int ret = -EINVAL;
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
struct thermal_governor *gov;
|
|
char name[THERMAL_NAME_LENGTH];
|
|
|
|
snprintf(name, sizeof(name), "%s", buf);
|
|
|
|
mutex_lock(&thermal_governor_lock);
|
|
|
|
gov = __find_governor(strim(name));
|
|
if (!gov)
|
|
goto exit;
|
|
|
|
tz->governor = gov;
|
|
ret = count;
|
|
|
|
exit:
|
|
mutex_unlock(&thermal_governor_lock);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t
|
|
policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
|
|
return sprintf(buf, "%s\n", tz->governor->name);
|
|
}
|
|
|
|
#ifdef CONFIG_THERMAL_EMULATION
|
|
static ssize_t
|
|
emul_temp_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
int ret = 0;
|
|
unsigned long temperature;
|
|
|
|
if (kstrtoul(buf, 10, &temperature))
|
|
return -EINVAL;
|
|
|
|
if (!tz->ops->set_emul_temp) {
|
|
mutex_lock(&tz->lock);
|
|
tz->emul_temperature = temperature;
|
|
mutex_unlock(&tz->lock);
|
|
} else {
|
|
ret = tz->ops->set_emul_temp(tz, temperature);
|
|
}
|
|
|
|
if (!ret)
|
|
thermal_zone_device_update(tz);
|
|
|
|
return ret ? ret : count;
|
|
}
|
|
static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
|
|
#endif/*CONFIG_THERMAL_EMULATION*/
|
|
|
|
static DEVICE_ATTR(type, 0444, type_show, NULL);
|
|
static DEVICE_ATTR(temp, 0444, temp_show, NULL);
|
|
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
|
|
static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
|
|
static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
|
|
|
|
/* sys I/F for cooling device */
|
|
#define to_cooling_device(_dev) \
|
|
container_of(_dev, struct thermal_cooling_device, device)
|
|
|
|
static ssize_t
|
|
thermal_cooling_device_type_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
|
|
return sprintf(buf, "%s\n", cdev->type);
|
|
}
|
|
|
|
static ssize_t
|
|
thermal_cooling_device_max_state_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
unsigned long state;
|
|
int ret;
|
|
|
|
ret = cdev->ops->get_max_state(cdev, &state);
|
|
if (ret)
|
|
return ret;
|
|
return sprintf(buf, "%ld\n", state);
|
|
}
|
|
|
|
static ssize_t
|
|
thermal_cooling_device_cur_state_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
unsigned long state;
|
|
int ret;
|
|
|
|
ret = cdev->ops->get_cur_state(cdev, &state);
|
|
if (ret)
|
|
return ret;
|
|
return sprintf(buf, "%ld\n", state);
|
|
}
|
|
|
|
static ssize_t
|
|
thermal_cooling_device_cur_state_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct thermal_cooling_device *cdev = to_cooling_device(dev);
|
|
unsigned long state;
|
|
int result;
|
|
|
|
if (!sscanf(buf, "%ld\n", &state))
|
|
return -EINVAL;
|
|
|
|
if ((long)state < 0)
|
|
return -EINVAL;
|
|
|
|
result = cdev->ops->set_cur_state(cdev, state);
|
|
if (result)
|
|
return result;
|
|
return count;
|
|
}
|
|
|
|
static struct device_attribute dev_attr_cdev_type =
|
|
__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
|
|
static DEVICE_ATTR(max_state, 0444,
|
|
thermal_cooling_device_max_state_show, NULL);
|
|
static DEVICE_ATTR(cur_state, 0644,
|
|
thermal_cooling_device_cur_state_show,
|
|
thermal_cooling_device_cur_state_store);
|
|
|
|
static ssize_t
|
|
thermal_cooling_device_trip_point_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_instance *instance;
|
|
|
|
instance =
|
|
container_of(attr, struct thermal_instance, attr);
|
|
|
|
if (instance->trip == THERMAL_TRIPS_NONE)
|
|
return sprintf(buf, "-1\n");
|
|
else
|
|
return sprintf(buf, "%d\n", instance->trip);
|
|
}
|
|
|
|
/* Device management */
|
|
|
|
/**
|
|
* thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
|
|
* @tz: pointer to struct thermal_zone_device
|
|
* @trip: indicates which trip point the cooling devices is
|
|
* associated with in this thermal zone.
|
|
* @cdev: pointer to struct thermal_cooling_device
|
|
* @upper: the Maximum cooling state for this trip point.
|
|
* THERMAL_NO_LIMIT means no upper limit,
|
|
* and the cooling device can be in max_state.
|
|
* @lower: the Minimum cooling state can be used for this trip point.
|
|
* THERMAL_NO_LIMIT means no lower limit,
|
|
* and the cooling device can be in cooling state 0.
|
|
*
|
|
* This interface function bind a thermal cooling device to the certain trip
|
|
* point of a thermal zone device.
|
|
* This function is usually called in the thermal zone device .bind callback.
|
|
*
|
|
* Return: 0 on success, the proper error value otherwise.
|
|
*/
|
|
int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
|
|
int trip,
|
|
struct thermal_cooling_device *cdev,
|
|
unsigned long upper, unsigned long lower)
|
|
{
|
|
struct thermal_instance *dev;
|
|
struct thermal_instance *pos;
|
|
struct thermal_zone_device *pos1;
|
|
struct thermal_cooling_device *pos2;
|
|
unsigned long max_state;
|
|
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;
|
|
|
|
cdev->ops->get_max_state(cdev, &max_state);
|
|
|
|
/* lower default 0, upper default max_state */
|
|
lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
|
|
upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
|
|
|
|
if (lower > upper || upper > max_state)
|
|
return -EINVAL;
|
|
|
|
dev =
|
|
kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
dev->tz = tz;
|
|
dev->cdev = cdev;
|
|
dev->trip = trip;
|
|
dev->upper = upper;
|
|
dev->lower = lower;
|
|
dev->target = THERMAL_NO_TARGET;
|
|
|
|
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);
|
|
sysfs_attr_init(&dev->attr.attr);
|
|
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);
|
|
mutex_lock(&cdev->lock);
|
|
list_for_each_entry(pos, &tz->thermal_instances, tz_node)
|
|
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
|
|
result = -EEXIST;
|
|
break;
|
|
}
|
|
if (!result) {
|
|
list_add_tail(&dev->tz_node, &tz->thermal_instances);
|
|
list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
|
|
}
|
|
mutex_unlock(&cdev->lock);
|
|
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_GPL(thermal_zone_bind_cooling_device);
|
|
|
|
/**
|
|
* thermal_zone_unbind_cooling_device() - unbind a cooling device from a
|
|
* thermal zone.
|
|
* @tz: pointer to a struct thermal_zone_device.
|
|
* @trip: indicates which trip point the cooling devices is
|
|
* associated with in this thermal zone.
|
|
* @cdev: pointer to a struct thermal_cooling_device.
|
|
*
|
|
* This interface function unbind a thermal cooling device from the certain
|
|
* trip point of a thermal zone device.
|
|
* This function is usually called in the thermal zone device .unbind callback.
|
|
*
|
|
* Return: 0 on success, the proper error value otherwise.
|
|
*/
|
|
int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
|
|
int trip,
|
|
struct thermal_cooling_device *cdev)
|
|
{
|
|
struct thermal_instance *pos, *next;
|
|
|
|
mutex_lock(&tz->lock);
|
|
mutex_lock(&cdev->lock);
|
|
list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
|
|
if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
|
|
list_del(&pos->tz_node);
|
|
list_del(&pos->cdev_node);
|
|
mutex_unlock(&cdev->lock);
|
|
mutex_unlock(&tz->lock);
|
|
goto unbind;
|
|
}
|
|
}
|
|
mutex_unlock(&cdev->lock);
|
|
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_GPL(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 if(!strncmp(dev_name(dev), "cooling_device",
|
|
sizeof("cooling_device") - 1)){
|
|
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
|
|
* @np: a pointer to a device tree node.
|
|
* @type: the thermal cooling device type.
|
|
* @devdata: device private data.
|
|
* @ops: standard thermal cooling devices callbacks.
|
|
*
|
|
* This interface function adds a new thermal cooling device (fan/processor/...)
|
|
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
|
|
* to all the thermal zone devices registered at the same time.
|
|
* It also gives the opportunity to link the cooling device to a device tree
|
|
* node, so that it can be bound to a thermal zone created out of device tree.
|
|
*
|
|
* Return: a pointer to the created struct thermal_cooling_device or an
|
|
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
|
|
*/
|
|
static struct thermal_cooling_device *
|
|
__thermal_cooling_device_register(struct device_node *np,
|
|
char *type, void *devdata,
|
|
const struct thermal_cooling_device_ops *ops)
|
|
{
|
|
struct thermal_cooling_device *cdev;
|
|
int result;
|
|
|
|
if (type && 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);
|
|
}
|
|
|
|
strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
|
|
mutex_init(&cdev->lock);
|
|
INIT_LIST_HEAD(&cdev->thermal_instances);
|
|
cdev->np = np;
|
|
cdev->ops = ops;
|
|
cdev->updated = false;
|
|
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;
|
|
|
|
/* Add 'this' new cdev to the global cdev list */
|
|
mutex_lock(&thermal_list_lock);
|
|
list_add(&cdev->node, &thermal_cdev_list);
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
/* Update binding information for 'this' new cdev */
|
|
bind_cdev(cdev);
|
|
|
|
return cdev;
|
|
|
|
unregister:
|
|
release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
|
|
device_unregister(&cdev->device);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* This interface function adds a new thermal cooling device (fan/processor/...)
|
|
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
|
|
* to all the thermal zone devices registered at the same time.
|
|
*
|
|
* Return: a pointer to the created struct thermal_cooling_device or an
|
|
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
|
|
*/
|
|
struct thermal_cooling_device *
|
|
thermal_cooling_device_register(char *type, void *devdata,
|
|
const struct thermal_cooling_device_ops *ops)
|
|
{
|
|
return __thermal_cooling_device_register(NULL, type, devdata, ops);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
|
|
|
|
/**
|
|
* thermal_of_cooling_device_register() - register an OF thermal cooling device
|
|
* @np: a pointer to a device tree node.
|
|
* @type: the thermal cooling device type.
|
|
* @devdata: device private data.
|
|
* @ops: standard thermal cooling devices callbacks.
|
|
*
|
|
* This function will register a cooling device with device tree node reference.
|
|
* This interface function adds a new thermal cooling device (fan/processor/...)
|
|
* to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
|
|
* to all the thermal zone devices registered at the same time.
|
|
*
|
|
* Return: a pointer to the created struct thermal_cooling_device or an
|
|
* ERR_PTR. Caller must check return value with IS_ERR*() helpers.
|
|
*/
|
|
struct thermal_cooling_device *
|
|
thermal_of_cooling_device_register(struct device_node *np,
|
|
char *type, void *devdata,
|
|
const struct thermal_cooling_device_ops *ops)
|
|
{
|
|
return __thermal_cooling_device_register(np, type, devdata, ops);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_of_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)
|
|
{
|
|
int i;
|
|
const struct thermal_zone_params *tzp;
|
|
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);
|
|
|
|
/* Unbind all thermal zones associated with 'this' cdev */
|
|
list_for_each_entry(tz, &thermal_tz_list, node) {
|
|
if (tz->ops->unbind) {
|
|
tz->ops->unbind(tz, cdev);
|
|
continue;
|
|
}
|
|
|
|
if (!tz->tzp || !tz->tzp->tbp)
|
|
continue;
|
|
|
|
tzp = tz->tzp;
|
|
for (i = 0; i < tzp->num_tbps; i++) {
|
|
if (tzp->tbp[i].cdev == cdev) {
|
|
__unbind(tz, tzp->tbp[i].trip_mask, cdev);
|
|
tzp->tbp[i].cdev = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
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_GPL(thermal_cooling_device_unregister);
|
|
|
|
void thermal_cdev_update(struct thermal_cooling_device *cdev)
|
|
{
|
|
struct thermal_instance *instance;
|
|
unsigned long target = 0;
|
|
|
|
/* cooling device is updated*/
|
|
if (cdev->updated)
|
|
return;
|
|
|
|
mutex_lock(&cdev->lock);
|
|
/* Make sure cdev enters the deepest cooling state */
|
|
list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
|
|
dev_dbg(&cdev->device, "zone%d->target=%lu\n",
|
|
instance->tz->id, instance->target);
|
|
if (instance->target == THERMAL_NO_TARGET)
|
|
continue;
|
|
if (instance->target > target)
|
|
target = instance->target;
|
|
}
|
|
mutex_unlock(&cdev->lock);
|
|
cdev->ops->set_cur_state(cdev, target);
|
|
cdev->updated = true;
|
|
dev_dbg(&cdev->device, "set to state %lu\n", target);
|
|
}
|
|
EXPORT_SYMBOL(thermal_cdev_update);
|
|
|
|
/**
|
|
* thermal_notify_framework - Sensor drivers use this API to notify framework
|
|
* @tz: thermal zone device
|
|
* @trip: indicates which trip point has been crossed
|
|
*
|
|
* This function handles the trip events from sensor drivers. It starts
|
|
* throttling the cooling devices according to the policy configured.
|
|
* For CRITICAL and HOT trip points, this notifies the respective drivers,
|
|
* and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
|
|
* The throttling policy is based on the configured platform data; if no
|
|
* platform data is provided, this uses the step_wise throttling policy.
|
|
*/
|
|
void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
|
|
{
|
|
handle_thermal_trip(tz, trip);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_notify_framework);
|
|
|
|
/**
|
|
* 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 indx;
|
|
int size = sizeof(struct thermal_attr) * tz->trips;
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
|
|
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;
|
|
|
|
device_create_file(&tz->device,
|
|
&tz->trip_type_attrs[indx].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 (mask & (1 << indx)) {
|
|
tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
|
|
tz->trip_temp_attrs[indx].attr.store =
|
|
trip_point_temp_store;
|
|
}
|
|
|
|
device_create_file(&tz->device,
|
|
&tz->trip_temp_attrs[indx].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;
|
|
}
|
|
|
|
device_create_file(&tz->device,
|
|
&tz->trip_hyst_attrs[indx].attr);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void remove_trip_attrs(struct thermal_zone_device *tz)
|
|
{
|
|
int indx;
|
|
|
|
for (indx = 0; indx < tz->trips; indx++) {
|
|
device_remove_file(&tz->device,
|
|
&tz->trip_type_attrs[indx].attr);
|
|
device_remove_file(&tz->device,
|
|
&tz->trip_temp_attrs[indx].attr);
|
|
if (tz->ops->get_trip_hyst)
|
|
device_remove_file(&tz->device,
|
|
&tz->trip_hyst_attrs[indx].attr);
|
|
}
|
|
kfree(tz->trip_type_attrs);
|
|
kfree(tz->trip_temp_attrs);
|
|
kfree(tz->trip_hyst_attrs);
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* @mask: a bit string indicating the writeablility of trip points
|
|
* @devdata: private device data
|
|
* @ops: standard thermal zone device callbacks
|
|
* @tzp: thermal zone platform parameters
|
|
* @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)
|
|
*
|
|
* This interface function adds a new thermal zone device (sensor) to
|
|
* /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
|
|
* thermal cooling devices registered at the same time.
|
|
* thermal_zone_device_unregister() must be called when the device is no
|
|
* longer needed. The passive cooling depends on the .get_trend() return value.
|
|
*
|
|
* Return: a pointer to the created struct thermal_zone_device or an
|
|
* in case of error, an ERR_PTR. Caller must check return value with
|
|
* IS_ERR*() helpers.
|
|
*/
|
|
struct thermal_zone_device *thermal_zone_device_register(const char *type,
|
|
int trips, int mask, void *devdata,
|
|
struct thermal_zone_device_ops *ops,
|
|
const struct thermal_zone_params *tzp,
|
|
int passive_delay, int polling_delay)
|
|
{
|
|
struct thermal_zone_device *tz;
|
|
enum thermal_trip_type trip_type;
|
|
int result;
|
|
int count;
|
|
int passive = 0;
|
|
|
|
if (type && strlen(type) >= THERMAL_NAME_LENGTH)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!ops)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
|
|
if (!tz)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
INIT_LIST_HEAD(&tz->thermal_instances);
|
|
idr_init(&tz->idr);
|
|
mutex_init(&tz->lock);
|
|
result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
|
|
if (result) {
|
|
kfree(tz);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
strlcpy(tz->type, type ? : "", sizeof(tz->type));
|
|
tz->ops = ops;
|
|
tz->tzp = tzp;
|
|
tz->device.class = &thermal_class;
|
|
tz->devdata = devdata;
|
|
tz->trips = trips;
|
|
tz->passive_delay = passive_delay;
|
|
tz->polling_delay = polling_delay;
|
|
|
|
dev_set_name(&tz->device, "thermal_zone%d", tz->id);
|
|
result = device_register(&tz->device);
|
|
if (result) {
|
|
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
|
|
kfree(tz);
|
|
return ERR_PTR(result);
|
|
}
|
|
|
|
/* sys I/F */
|
|
if (type) {
|
|
result = device_create_file(&tz->device, &dev_attr_type);
|
|
if (result)
|
|
goto unregister;
|
|
}
|
|
|
|
result = device_create_file(&tz->device, &dev_attr_temp);
|
|
if (result)
|
|
goto unregister;
|
|
|
|
if (ops->get_mode) {
|
|
result = device_create_file(&tz->device, &dev_attr_mode);
|
|
if (result)
|
|
goto unregister;
|
|
}
|
|
|
|
result = create_trip_attrs(tz, mask);
|
|
if (result)
|
|
goto unregister;
|
|
|
|
for (count = 0; count < trips; count++) {
|
|
tz->ops->get_trip_type(tz, count, &trip_type);
|
|
if (trip_type == THERMAL_TRIP_PASSIVE)
|
|
passive = 1;
|
|
}
|
|
|
|
if (!passive) {
|
|
result = device_create_file(&tz->device, &dev_attr_passive);
|
|
if (result)
|
|
goto unregister;
|
|
}
|
|
|
|
#ifdef CONFIG_THERMAL_EMULATION
|
|
result = device_create_file(&tz->device, &dev_attr_emul_temp);
|
|
if (result)
|
|
goto unregister;
|
|
#endif
|
|
/* Create policy attribute */
|
|
result = device_create_file(&tz->device, &dev_attr_policy);
|
|
if (result)
|
|
goto unregister;
|
|
|
|
/* Update 'this' zone's governor information */
|
|
mutex_lock(&thermal_governor_lock);
|
|
|
|
if (tz->tzp)
|
|
tz->governor = __find_governor(tz->tzp->governor_name);
|
|
else
|
|
tz->governor = def_governor;
|
|
|
|
mutex_unlock(&thermal_governor_lock);
|
|
|
|
if (!tz->tzp || !tz->tzp->no_hwmon) {
|
|
result = thermal_add_hwmon_sysfs(tz);
|
|
if (result)
|
|
goto unregister;
|
|
}
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_add_tail(&tz->node, &thermal_tz_list);
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
/* Bind cooling devices for this zone */
|
|
bind_tz(tz);
|
|
|
|
INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
|
|
|
|
if (!tz->ops->get_temp)
|
|
thermal_zone_device_set_polling(tz, 0);
|
|
|
|
thermal_zone_device_update(tz);
|
|
|
|
if (!result)
|
|
return tz;
|
|
|
|
unregister:
|
|
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
|
|
device_unregister(&tz->device);
|
|
return ERR_PTR(result);
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_device_register);
|
|
|
|
/**
|
|
* thermal_device_unregister - removes the registered thermal zone device
|
|
* @tz: the thermal zone device to remove
|
|
*/
|
|
void thermal_zone_device_unregister(struct thermal_zone_device *tz)
|
|
{
|
|
int i;
|
|
const struct thermal_zone_params *tzp;
|
|
struct thermal_cooling_device *cdev;
|
|
struct thermal_zone_device *pos = NULL;
|
|
|
|
if (!tz)
|
|
return;
|
|
|
|
tzp = tz->tzp;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(pos, &thermal_tz_list, node)
|
|
if (pos == tz)
|
|
break;
|
|
if (pos != tz) {
|
|
/* thermal zone device not found */
|
|
mutex_unlock(&thermal_list_lock);
|
|
return;
|
|
}
|
|
list_del(&tz->node);
|
|
|
|
/* Unbind all cdevs associated with 'this' thermal zone */
|
|
list_for_each_entry(cdev, &thermal_cdev_list, node) {
|
|
if (tz->ops->unbind) {
|
|
tz->ops->unbind(tz, cdev);
|
|
continue;
|
|
}
|
|
|
|
if (!tzp || !tzp->tbp)
|
|
break;
|
|
|
|
for (i = 0; i < tzp->num_tbps; i++) {
|
|
if (tzp->tbp[i].cdev == cdev) {
|
|
__unbind(tz, tzp->tbp[i].trip_mask, cdev);
|
|
tzp->tbp[i].cdev = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
thermal_zone_device_set_polling(tz, 0);
|
|
|
|
if (tz->type[0])
|
|
device_remove_file(&tz->device, &dev_attr_type);
|
|
device_remove_file(&tz->device, &dev_attr_temp);
|
|
if (tz->ops->get_mode)
|
|
device_remove_file(&tz->device, &dev_attr_mode);
|
|
device_remove_file(&tz->device, &dev_attr_policy);
|
|
remove_trip_attrs(tz);
|
|
tz->governor = NULL;
|
|
|
|
thermal_remove_hwmon_sysfs(tz);
|
|
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
|
|
idr_destroy(&tz->idr);
|
|
mutex_destroy(&tz->lock);
|
|
device_unregister(&tz->device);
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
|
|
|
|
/**
|
|
* thermal_zone_get_zone_by_name() - search for a zone and returns its ref
|
|
* @name: thermal zone name to fetch the temperature
|
|
*
|
|
* When only one zone is found with the passed name, returns a reference to it.
|
|
*
|
|
* Return: On success returns a reference to an unique thermal zone with
|
|
* matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
|
|
* paramenters, -ENODEV for not found and -EEXIST for multiple matches).
|
|
*/
|
|
struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
|
|
{
|
|
struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
|
|
unsigned int found = 0;
|
|
|
|
if (!name)
|
|
goto exit;
|
|
|
|
mutex_lock(&thermal_list_lock);
|
|
list_for_each_entry(pos, &thermal_tz_list, node)
|
|
if (!strnicmp(name, pos->type, THERMAL_NAME_LENGTH)) {
|
|
found++;
|
|
ref = pos;
|
|
}
|
|
mutex_unlock(&thermal_list_lock);
|
|
|
|
/* nothing has been found, thus an error code for it */
|
|
if (found == 0)
|
|
ref = ERR_PTR(-ENODEV);
|
|
else if (found > 1)
|
|
/* Success only when an unique zone is found */
|
|
ref = ERR_PTR(-EEXIST);
|
|
|
|
exit:
|
|
return ref;
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
|
|
|
|
#ifdef CONFIG_NET
|
|
static const struct genl_multicast_group thermal_event_mcgrps[] = {
|
|
{ .name = THERMAL_GENL_MCAST_GROUP_NAME, },
|
|
};
|
|
|
|
static struct genl_family thermal_event_genl_family = {
|
|
.id = GENL_ID_GENERATE,
|
|
.name = THERMAL_GENL_FAMILY_NAME,
|
|
.version = THERMAL_GENL_VERSION,
|
|
.maxattr = THERMAL_GENL_ATTR_MAX,
|
|
.mcgrps = thermal_event_mcgrps,
|
|
.n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
|
|
};
|
|
|
|
int thermal_generate_netlink_event(struct thermal_zone_device *tz,
|
|
enum events event)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct nlattr *attr;
|
|
struct thermal_genl_event *thermal_event;
|
|
void *msg_header;
|
|
int size;
|
|
int result;
|
|
static unsigned int thermal_event_seqnum;
|
|
|
|
if (!tz)
|
|
return -EINVAL;
|
|
|
|
/* allocate memory */
|
|
size = nla_total_size(sizeof(struct thermal_genl_event)) +
|
|
nla_total_size(0);
|
|
|
|
skb = genlmsg_new(size, GFP_ATOMIC);
|
|
if (!skb)
|
|
return -ENOMEM;
|
|
|
|
/* add the genetlink message header */
|
|
msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
|
|
&thermal_event_genl_family, 0,
|
|
THERMAL_GENL_CMD_EVENT);
|
|
if (!msg_header) {
|
|
nlmsg_free(skb);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* fill the data */
|
|
attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
|
|
sizeof(struct thermal_genl_event));
|
|
|
|
if (!attr) {
|
|
nlmsg_free(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
thermal_event = nla_data(attr);
|
|
if (!thermal_event) {
|
|
nlmsg_free(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
memset(thermal_event, 0, sizeof(struct thermal_genl_event));
|
|
|
|
thermal_event->orig = tz->id;
|
|
thermal_event->event = event;
|
|
|
|
/* send multicast genetlink message */
|
|
result = genlmsg_end(skb, msg_header);
|
|
if (result < 0) {
|
|
nlmsg_free(skb);
|
|
return result;
|
|
}
|
|
|
|
result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
|
|
0, GFP_ATOMIC);
|
|
if (result)
|
|
dev_err(&tz->device, "Failed to send netlink event:%d", result);
|
|
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
|
|
|
|
static int genetlink_init(void)
|
|
{
|
|
return genl_register_family(&thermal_event_genl_family);
|
|
}
|
|
|
|
static void genetlink_exit(void)
|
|
{
|
|
genl_unregister_family(&thermal_event_genl_family);
|
|
}
|
|
#else /* !CONFIG_NET */
|
|
static inline int genetlink_init(void) { return 0; }
|
|
static inline void genetlink_exit(void) {}
|
|
#endif /* !CONFIG_NET */
|
|
|
|
static int __init thermal_register_governors(void)
|
|
{
|
|
int result;
|
|
|
|
result = thermal_gov_step_wise_register();
|
|
if (result)
|
|
return result;
|
|
|
|
result = thermal_gov_fair_share_register();
|
|
if (result)
|
|
return result;
|
|
|
|
return thermal_gov_user_space_register();
|
|
}
|
|
|
|
static void thermal_unregister_governors(void)
|
|
{
|
|
thermal_gov_step_wise_unregister();
|
|
thermal_gov_fair_share_unregister();
|
|
thermal_gov_user_space_unregister();
|
|
}
|
|
|
|
static int __init thermal_init(void)
|
|
{
|
|
int result;
|
|
|
|
result = thermal_register_governors();
|
|
if (result)
|
|
goto error;
|
|
|
|
result = class_register(&thermal_class);
|
|
if (result)
|
|
goto unregister_governors;
|
|
|
|
result = genetlink_init();
|
|
if (result)
|
|
goto unregister_class;
|
|
|
|
result = of_parse_thermal_zones();
|
|
if (result)
|
|
goto exit_netlink;
|
|
|
|
return 0;
|
|
|
|
exit_netlink:
|
|
genetlink_exit();
|
|
unregister_governors:
|
|
thermal_unregister_governors();
|
|
unregister_class:
|
|
class_unregister(&thermal_class);
|
|
error:
|
|
idr_destroy(&thermal_tz_idr);
|
|
idr_destroy(&thermal_cdev_idr);
|
|
mutex_destroy(&thermal_idr_lock);
|
|
mutex_destroy(&thermal_list_lock);
|
|
mutex_destroy(&thermal_governor_lock);
|
|
return result;
|
|
}
|
|
|
|
static void __exit thermal_exit(void)
|
|
{
|
|
of_thermal_destroy_zones();
|
|
genetlink_exit();
|
|
class_unregister(&thermal_class);
|
|
thermal_unregister_governors();
|
|
idr_destroy(&thermal_tz_idr);
|
|
idr_destroy(&thermal_cdev_idr);
|
|
mutex_destroy(&thermal_idr_lock);
|
|
mutex_destroy(&thermal_list_lock);
|
|
mutex_destroy(&thermal_governor_lock);
|
|
}
|
|
|
|
fs_initcall(thermal_init);
|
|
module_exit(thermal_exit);
|