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77e337c6e2
ACPI INT3402 device object could report temperature for the memory module. To expose such information to user space, a thermal zone device is registered for it so that the thermal sysfs interface can expose such information for userspace to use. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com>
355 lines
12 KiB
C
355 lines
12 KiB
C
/*
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* thermal.h ($Revision: 0 $)
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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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* 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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#ifndef __THERMAL_H__
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#define __THERMAL_H__
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#include <linux/of.h>
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#include <linux/idr.h>
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#include <linux/device.h>
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#include <linux/workqueue.h>
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#define THERMAL_TRIPS_NONE -1
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#define THERMAL_MAX_TRIPS 12
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#define THERMAL_NAME_LENGTH 20
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/* invalid cooling state */
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#define THERMAL_CSTATE_INVALID -1UL
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/* No upper/lower limit requirement */
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#define THERMAL_NO_LIMIT THERMAL_CSTATE_INVALID
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/* Unit conversion macros */
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#define KELVIN_TO_CELSIUS(t) (long)(((long)t-2732 >= 0) ? \
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((long)t-2732+5)/10 : ((long)t-2732-5)/10)
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#define CELSIUS_TO_KELVIN(t) ((t)*10+2732)
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#define DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, off) (((t) - (off)) * 100)
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#define DECI_KELVIN_TO_MILLICELSIUS(t) DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(t, 2732)
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#define MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, off) (((t) / 100) + (off))
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#define MILLICELSIUS_TO_DECI_KELVIN(t) MILLICELSIUS_TO_DECI_KELVIN_WITH_OFFSET(t, 2732)
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/* Adding event notification support elements */
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#define THERMAL_GENL_FAMILY_NAME "thermal_event"
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#define THERMAL_GENL_VERSION 0x01
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#define THERMAL_GENL_MCAST_GROUP_NAME "thermal_mc_grp"
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/* Default Thermal Governor */
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#if defined(CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE)
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#define DEFAULT_THERMAL_GOVERNOR "step_wise"
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#elif defined(CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE)
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#define DEFAULT_THERMAL_GOVERNOR "fair_share"
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#elif defined(CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE)
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#define DEFAULT_THERMAL_GOVERNOR "user_space"
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#endif
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struct thermal_zone_device;
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struct thermal_cooling_device;
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enum thermal_device_mode {
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THERMAL_DEVICE_DISABLED = 0,
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THERMAL_DEVICE_ENABLED,
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};
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enum thermal_trip_type {
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THERMAL_TRIP_ACTIVE = 0,
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THERMAL_TRIP_PASSIVE,
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THERMAL_TRIP_HOT,
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THERMAL_TRIP_CRITICAL,
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};
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enum thermal_trend {
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THERMAL_TREND_STABLE, /* temperature is stable */
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THERMAL_TREND_RAISING, /* temperature is raising */
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THERMAL_TREND_DROPPING, /* temperature is dropping */
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THERMAL_TREND_RAISE_FULL, /* apply highest cooling action */
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THERMAL_TREND_DROP_FULL, /* apply lowest cooling action */
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};
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/* Events supported by Thermal Netlink */
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enum events {
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THERMAL_AUX0,
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THERMAL_AUX1,
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THERMAL_CRITICAL,
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THERMAL_DEV_FAULT,
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};
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/* attributes of thermal_genl_family */
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enum {
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THERMAL_GENL_ATTR_UNSPEC,
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THERMAL_GENL_ATTR_EVENT,
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__THERMAL_GENL_ATTR_MAX,
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};
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#define THERMAL_GENL_ATTR_MAX (__THERMAL_GENL_ATTR_MAX - 1)
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/* commands supported by the thermal_genl_family */
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enum {
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THERMAL_GENL_CMD_UNSPEC,
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THERMAL_GENL_CMD_EVENT,
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__THERMAL_GENL_CMD_MAX,
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};
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#define THERMAL_GENL_CMD_MAX (__THERMAL_GENL_CMD_MAX - 1)
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struct thermal_zone_device_ops {
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int (*bind) (struct thermal_zone_device *,
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struct thermal_cooling_device *);
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int (*unbind) (struct thermal_zone_device *,
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struct thermal_cooling_device *);
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int (*get_temp) (struct thermal_zone_device *, unsigned long *);
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int (*get_mode) (struct thermal_zone_device *,
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enum thermal_device_mode *);
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int (*set_mode) (struct thermal_zone_device *,
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enum thermal_device_mode);
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int (*get_trip_type) (struct thermal_zone_device *, int,
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enum thermal_trip_type *);
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int (*get_trip_temp) (struct thermal_zone_device *, int,
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unsigned long *);
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int (*set_trip_temp) (struct thermal_zone_device *, int,
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unsigned long);
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int (*get_trip_hyst) (struct thermal_zone_device *, int,
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unsigned long *);
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int (*set_trip_hyst) (struct thermal_zone_device *, int,
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unsigned long);
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int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
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int (*set_emul_temp) (struct thermal_zone_device *, unsigned long);
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int (*get_trend) (struct thermal_zone_device *, int,
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enum thermal_trend *);
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int (*notify) (struct thermal_zone_device *, int,
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enum thermal_trip_type);
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};
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struct thermal_cooling_device_ops {
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int (*get_max_state) (struct thermal_cooling_device *, unsigned long *);
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int (*get_cur_state) (struct thermal_cooling_device *, unsigned long *);
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int (*set_cur_state) (struct thermal_cooling_device *, unsigned long);
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};
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struct thermal_cooling_device {
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int id;
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char type[THERMAL_NAME_LENGTH];
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struct device device;
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struct device_node *np;
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void *devdata;
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const struct thermal_cooling_device_ops *ops;
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bool updated; /* true if the cooling device does not need update */
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struct mutex lock; /* protect thermal_instances list */
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struct list_head thermal_instances;
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struct list_head node;
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};
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struct thermal_attr {
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struct device_attribute attr;
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char name[THERMAL_NAME_LENGTH];
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};
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/**
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* struct thermal_zone_device - structure for a thermal zone
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* @id: unique id number for each thermal zone
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* @type: the thermal zone device type
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* @device: &struct device for this thermal zone
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* @trip_temp_attrs: attributes for trip points for sysfs: trip temperature
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* @trip_type_attrs: attributes for trip points for sysfs: trip type
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* @trip_hyst_attrs: attributes for trip points for sysfs: trip hysteresis
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* @devdata: private pointer for device private data
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* @trips: number of trip points the thermal zone supports
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* @passive_delay: number of milliseconds to wait between polls when
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* performing passive cooling. Currenty only used by the
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* step-wise governor
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* @polling_delay: number of milliseconds to wait between polls when
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* checking whether trip points have been crossed (0 for
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* interrupt driven systems)
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* @temperature: current temperature. This is only for core code,
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* drivers should use thermal_zone_get_temp() to get the
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* current temperature
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* @last_temperature: previous temperature read
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* @emul_temperature: emulated temperature when using CONFIG_THERMAL_EMULATION
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* @passive: 1 if you've crossed a passive trip point, 0 otherwise.
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* Currenty only used by the step-wise governor.
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* @forced_passive: If > 0, temperature at which to switch on all ACPI
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* processor cooling devices. Currently only used by the
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* step-wise governor.
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* @ops: operations this &thermal_zone_device supports
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* @tzp: thermal zone parameters
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* @governor: pointer to the governor for this thermal zone
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* @thermal_instances: list of &struct thermal_instance of this thermal zone
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* @idr: &struct idr to generate unique id for this zone's cooling
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* devices
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* @lock: lock to protect thermal_instances list
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* @node: node in thermal_tz_list (in thermal_core.c)
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* @poll_queue: delayed work for polling
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*/
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struct thermal_zone_device {
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int id;
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char type[THERMAL_NAME_LENGTH];
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struct device device;
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struct thermal_attr *trip_temp_attrs;
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struct thermal_attr *trip_type_attrs;
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struct thermal_attr *trip_hyst_attrs;
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void *devdata;
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int trips;
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int passive_delay;
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int polling_delay;
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int temperature;
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int last_temperature;
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int emul_temperature;
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int passive;
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unsigned int forced_passive;
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struct thermal_zone_device_ops *ops;
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const struct thermal_zone_params *tzp;
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struct thermal_governor *governor;
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struct list_head thermal_instances;
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struct idr idr;
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struct mutex lock;
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struct list_head node;
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struct delayed_work poll_queue;
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};
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/**
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* struct thermal_governor - structure that holds thermal governor information
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* @name: name of the governor
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* @throttle: callback called for every trip point even if temperature is
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* below the trip point temperature
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* @governor_list: node in thermal_governor_list (in thermal_core.c)
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*/
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struct thermal_governor {
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char name[THERMAL_NAME_LENGTH];
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int (*throttle)(struct thermal_zone_device *tz, int trip);
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struct list_head governor_list;
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};
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/* Structure that holds binding parameters for a zone */
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struct thermal_bind_params {
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struct thermal_cooling_device *cdev;
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/*
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* This is a measure of 'how effectively these devices can
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* cool 'this' thermal zone. The shall be determined by platform
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* characterization. This is on a 'percentage' scale.
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* See Documentation/thermal/sysfs-api.txt for more information.
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*/
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int weight;
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/*
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* This is a bit mask that gives the binding relation between this
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* thermal zone and cdev, for a particular trip point.
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* See Documentation/thermal/sysfs-api.txt for more information.
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*/
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int trip_mask;
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/*
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* This is an array of cooling state limits. Must have exactly
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* 2 * thermal_zone.number_of_trip_points. It is an array consisting
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* of tuples <lower-state upper-state> of state limits. Each trip
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* will be associated with one state limit tuple when binding.
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* A NULL pointer means <THERMAL_NO_LIMITS THERMAL_NO_LIMITS>
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* on all trips.
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*/
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unsigned long *binding_limits;
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int (*match) (struct thermal_zone_device *tz,
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struct thermal_cooling_device *cdev);
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};
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/* Structure to define Thermal Zone parameters */
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struct thermal_zone_params {
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char governor_name[THERMAL_NAME_LENGTH];
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/*
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* a boolean to indicate if the thermal to hwmon sysfs interface
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* is required. when no_hwmon == false, a hwmon sysfs interface
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* will be created. when no_hwmon == true, nothing will be done
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*/
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bool no_hwmon;
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int num_tbps; /* Number of tbp entries */
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struct thermal_bind_params *tbp;
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};
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struct thermal_genl_event {
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u32 orig;
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enum events event;
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};
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/* Function declarations */
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#ifdef CONFIG_THERMAL_OF
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struct thermal_zone_device *
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thermal_zone_of_sensor_register(struct device *dev, int id,
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void *data, int (*get_temp)(void *, long *),
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int (*get_trend)(void *, long *));
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void thermal_zone_of_sensor_unregister(struct device *dev,
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struct thermal_zone_device *tz);
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#else
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static inline struct thermal_zone_device *
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thermal_zone_of_sensor_register(struct device *dev, int id,
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void *data, int (*get_temp)(void *, long *),
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int (*get_trend)(void *, long *))
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{
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return NULL;
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}
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static inline
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void thermal_zone_of_sensor_unregister(struct device *dev,
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struct thermal_zone_device *tz)
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{
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}
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#endif
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struct thermal_zone_device *thermal_zone_device_register(const char *, int, int,
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void *, struct thermal_zone_device_ops *,
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const struct thermal_zone_params *, int, int);
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void thermal_zone_device_unregister(struct thermal_zone_device *);
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int thermal_zone_bind_cooling_device(struct thermal_zone_device *, int,
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struct thermal_cooling_device *,
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unsigned long, unsigned long);
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int thermal_zone_unbind_cooling_device(struct thermal_zone_device *, int,
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struct thermal_cooling_device *);
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void thermal_zone_device_update(struct thermal_zone_device *);
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struct thermal_cooling_device *thermal_cooling_device_register(char *, void *,
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const struct thermal_cooling_device_ops *);
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struct thermal_cooling_device *
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thermal_of_cooling_device_register(struct device_node *np, char *, void *,
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const struct thermal_cooling_device_ops *);
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void thermal_cooling_device_unregister(struct thermal_cooling_device *);
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struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
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int thermal_zone_get_temp(struct thermal_zone_device *tz, unsigned long *temp);
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int get_tz_trend(struct thermal_zone_device *, int);
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struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
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struct thermal_cooling_device *, int);
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void thermal_cdev_update(struct thermal_cooling_device *);
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void thermal_notify_framework(struct thermal_zone_device *, int);
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#ifdef CONFIG_NET
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extern int thermal_generate_netlink_event(struct thermal_zone_device *tz,
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enum events event);
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#else
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static inline int thermal_generate_netlink_event(struct thermal_zone_device *tz,
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enum events event)
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{
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return 0;
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}
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#endif
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#endif /* __THERMAL_H__ */
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