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![Linus Torvalds](/assets/img/avatar_default.png)
Pull thermal management updates from Zhang Rui: "Sorry that I missed the merge window as there is a bug found in the last minute, and I have to fix it and wait for the code to be tested in linux-next tree for a few days. Now the buggy patch has been dropped entirely from my next branch. Thus I hope those changes can still be merged in 3.18-rc2 as most of them are platform thermal driver changes. Specifics: - introduce ACPI INT340X thermal drivers. Newer laptops and tablets may have thermal sensors and other devices with thermal control capabilities that are exposed for the OS to use via the ACPI INT340x device objects. Several drivers are introduced to expose the temperature information and cooling ability from these objects to user-space via the normal thermal framework. From: Lu Aaron, Lan Tianyu, Jacob Pan and Zhang Rui. - introduce a new thermal governor, which just uses a hysteresis to switch abruptly on/off a cooling device. This governor can be used to control certain fan devices that can not be throttled but just switched on or off. From: Peter Feuerer. - introduce support for some new thermal interrupt functions on i.MX6SX, in IMX thermal driver. From: Anson, Huang. - introduce tracing support on thermal framework. From: Punit Agrawal. - small fixes in OF thermal and thermal step_wise governor" * 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux: (25 commits) Thermal: int340x thermal: select ACPI fan driver Thermal: int3400_thermal: use acpi_thermal_rel parsing APIs Thermal: int340x_thermal: expose acpi thermal relationship tables Thermal: introduce int3403 thermal driver Thermal: introduce INT3402 thermal driver Thermal: move the KELVIN_TO_MILLICELSIUS macro to thermal.h ACPI / Fan: support INT3404 thermal device ACPI / Fan: add ACPI 4.0 style fan support ACPI / fan: convert to platform driver ACPI / fan: use acpi_device_xxx_power instead of acpi_bus equivelant ACPI / fan: remove no need check for device pointer ACPI / fan: remove unused macro Thermal: int3400 thermal: register to thermal framework Thermal: int3400 thermal: add capability to detect supporting UUIDs Thermal: introduce int3400 thermal driver ACPI: add ACPI_TYPE_LOCAL_REFERENCE support to acpi_extract_package() ACPI: make acpi_create_platform_device() an external API thermal: step_wise: fix: Prevent from binary overflow when trend is dropping ACPI: introduce ACPI int340x thermal scan handler thermal: Added Bang-bang thermal governor ...
1866 lines
47 KiB
C
1866 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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#define CREATE_TRACE_POINTS
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#include <trace/events/thermal.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 (!strncasecmp(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 (!strncasecmp(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 (!strncasecmp(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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trace_thermal_zone_trip(tz, trip, trip_type);
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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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|
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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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|
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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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}
|
|
|
|
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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trace_thermal_temperature(tz);
|
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dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
|
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tz->last_temperature, tz->temperature);
|
|
}
|
|
|
|
void thermal_zone_device_update(struct thermal_zone_device *tz)
|
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{
|
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int count;
|
|
|
|
if (!tz->ops->get_temp)
|
|
return;
|
|
|
|
update_temperature(tz);
|
|
|
|
for (count = 0; count < tz->trips; count++)
|
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handle_thermal_trip(tz, count);
|
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}
|
|
EXPORT_SYMBOL_GPL(thermal_zone_device_update);
|
|
|
|
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);
|
|
}
|
|
|
|
/* sys I/F for thermal zone */
|
|
|
|
#define to_thermal_zone(_dev) \
|
|
container_of(_dev, struct thermal_zone_device, device)
|
|
|
|
static ssize_t
|
|
type_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
|
|
return sprintf(buf, "%s\n", tz->type);
|
|
}
|
|
|
|
static ssize_t
|
|
temp_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct thermal_zone_device *tz = to_thermal_zone(dev);
|
|
long temperature;
|
|
int ret;
|
|
|
|
ret = thermal_zone_get_temp(tz, &temperature);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
return sprintf(buf, "%ld\n", temperature);
|
|
}
|
|
|
|
static ssize_t
|
|
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;
|
|
trace_cdev_update(cdev, target);
|
|
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 (!strncasecmp(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;
|
|
|
|
result = thermal_gov_bang_bang_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_bang_bang_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);
|