4e5e4705bf
This patch introduces a device tree bindings for describing the hardware thermal behavior and limits. Also a parser to read and interpret the data and feed it in the thermal framework is presented. This patch introduces a thermal data parser for device tree. The parsed data is used to build thermal zones and thermal binding parameters. The output data can then be used to deploy thermal policies. This patch adds also documentation regarding this API and how to define tree nodes to use this infrastructure. Note that, in order to be able to have control on the sensor registration on the DT thermal zone, it was required to allow changing the thermal zone .get_temp callback. For this reason, this patch also removes the 'const' modifier from the .ops field of thermal zone devices. Cc: Zhang Rui <rui.zhang@intel.com> Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>
305 lines
9.6 KiB
C
305 lines
9.6 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/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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/* 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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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; /* protect thermal_instances list */
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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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/* Structure that holds thermal governor information */
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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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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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