339 lines
8.6 KiB
C
339 lines
8.6 KiB
C
/*
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* OMAP thermal driver interface
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/
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* Contact:
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* Eduardo Valentin <eduardo.valentin@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/workqueue.h>
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#include <linux/thermal.h>
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#include <linux/cpufreq.h>
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#include <linux/cpumask.h>
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#include <linux/cpu_cooling.h>
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#include "omap-thermal.h"
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#include "omap-bandgap.h"
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/* common data structures */
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struct omap_thermal_data {
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struct thermal_zone_device *omap_thermal;
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struct thermal_cooling_device *cool_dev;
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struct omap_bandgap *bg_ptr;
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enum thermal_device_mode mode;
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struct work_struct thermal_wq;
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int sensor_id;
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};
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static void omap_thermal_work(struct work_struct *work)
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{
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struct omap_thermal_data *data = container_of(work,
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struct omap_thermal_data, thermal_wq);
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thermal_zone_device_update(data->omap_thermal);
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dev_dbg(&data->omap_thermal->device, "updated thermal zone %s\n",
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data->omap_thermal->type);
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}
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/**
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* omap_thermal_hotspot_temperature - returns sensor extrapolated temperature
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* @t: omap sensor temperature
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* @s: omap sensor slope value
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* @c: omap sensor const value
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*/
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static inline int omap_thermal_hotspot_temperature(int t, int s, int c)
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{
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int delta = t * s / 1000 + c;
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if (delta < 0)
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delta = 0;
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return t + delta;
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}
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/* thermal zone ops */
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/* Get temperature callback function for thermal zone*/
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static inline int omap_thermal_get_temp(struct thermal_zone_device *thermal,
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unsigned long *temp)
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{
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struct omap_thermal_data *data = thermal->devdata;
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struct omap_bandgap *bg_ptr;
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struct omap_temp_sensor *s;
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int ret, tmp, pcb_temp, slope, constant;
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if (!data)
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return 0;
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bg_ptr = data->bg_ptr;
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s = &bg_ptr->conf->sensors[data->sensor_id];
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ret = omap_bandgap_read_temperature(bg_ptr, data->sensor_id, &tmp);
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if (ret)
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return ret;
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pcb_temp = 0;
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/* TODO: Introduce pcb temperature lookup */
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/* In case pcb zone is available, use the extrapolation rule with it */
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if (pcb_temp) {
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tmp -= pcb_temp;
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slope = s->slope_pcb;
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constant = s->constant_pcb;
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} else {
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slope = s->slope;
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constant = s->constant;
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}
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*temp = omap_thermal_hotspot_temperature(tmp, slope, constant);
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return ret;
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}
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/* Bind callback functions for thermal zone */
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static int omap_thermal_bind(struct thermal_zone_device *thermal,
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struct thermal_cooling_device *cdev)
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{
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struct omap_thermal_data *data = thermal->devdata;
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int id;
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if (IS_ERR_OR_NULL(data))
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return -ENODEV;
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/* check if this is the cooling device we registered */
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if (data->cool_dev != cdev)
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return 0;
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id = data->sensor_id;
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/* TODO: bind with min and max states */
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/* Simple thing, two trips, one passive another critical */
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return thermal_zone_bind_cooling_device(thermal, 0, cdev,
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THERMAL_NO_LIMIT,
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THERMAL_NO_LIMIT);
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}
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/* Unbind callback functions for thermal zone */
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static int omap_thermal_unbind(struct thermal_zone_device *thermal,
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struct thermal_cooling_device *cdev)
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{
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struct omap_thermal_data *data = thermal->devdata;
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if (IS_ERR_OR_NULL(data))
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return -ENODEV;
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/* check if this is the cooling device we registered */
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if (data->cool_dev != cdev)
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return 0;
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/* Simple thing, two trips, one passive another critical */
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return thermal_zone_unbind_cooling_device(thermal, 0, cdev);
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}
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/* Get mode callback functions for thermal zone */
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static int omap_thermal_get_mode(struct thermal_zone_device *thermal,
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enum thermal_device_mode *mode)
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{
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struct omap_thermal_data *data = thermal->devdata;
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if (data)
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*mode = data->mode;
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return 0;
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}
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/* Set mode callback functions for thermal zone */
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static int omap_thermal_set_mode(struct thermal_zone_device *thermal,
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enum thermal_device_mode mode)
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{
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struct omap_thermal_data *data = thermal->devdata;
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if (!data->omap_thermal) {
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dev_notice(&thermal->device, "thermal zone not registered\n");
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return 0;
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}
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mutex_lock(&data->omap_thermal->lock);
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if (mode == THERMAL_DEVICE_ENABLED)
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data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
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else
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data->omap_thermal->polling_delay = 0;
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mutex_unlock(&data->omap_thermal->lock);
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data->mode = mode;
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thermal_zone_device_update(data->omap_thermal);
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dev_dbg(&thermal->device, "thermal polling set for duration=%d msec\n",
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data->omap_thermal->polling_delay);
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return 0;
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}
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/* Get trip type callback functions for thermal zone */
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static int omap_thermal_get_trip_type(struct thermal_zone_device *thermal,
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int trip, enum thermal_trip_type *type)
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{
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if (!omap_thermal_is_valid_trip(trip))
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return -EINVAL;
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if (trip + 1 == OMAP_TRIP_NUMBER)
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*type = THERMAL_TRIP_CRITICAL;
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else
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*type = THERMAL_TRIP_PASSIVE;
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return 0;
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}
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/* Get trip temperature callback functions for thermal zone */
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static int omap_thermal_get_trip_temp(struct thermal_zone_device *thermal,
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int trip, unsigned long *temp)
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{
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if (!omap_thermal_is_valid_trip(trip))
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return -EINVAL;
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*temp = omap_thermal_get_trip_value(trip);
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return 0;
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}
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/* Get critical temperature callback functions for thermal zone */
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static int omap_thermal_get_crit_temp(struct thermal_zone_device *thermal,
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unsigned long *temp)
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{
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/* shutdown zone */
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return omap_thermal_get_trip_temp(thermal, OMAP_TRIP_NUMBER - 1, temp);
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}
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static struct thermal_zone_device_ops omap_thermal_ops = {
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.get_temp = omap_thermal_get_temp,
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/* TODO: add .get_trend */
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.bind = omap_thermal_bind,
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.unbind = omap_thermal_unbind,
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.get_mode = omap_thermal_get_mode,
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.set_mode = omap_thermal_set_mode,
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.get_trip_type = omap_thermal_get_trip_type,
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.get_trip_temp = omap_thermal_get_trip_temp,
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.get_crit_temp = omap_thermal_get_crit_temp,
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};
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static struct omap_thermal_data
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*omap_thermal_build_data(struct omap_bandgap *bg_ptr, int id)
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{
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struct omap_thermal_data *data;
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data = devm_kzalloc(bg_ptr->dev, sizeof(*data), GFP_KERNEL);
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if (!data) {
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dev_err(bg_ptr->dev, "kzalloc fail\n");
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return NULL;
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}
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data->sensor_id = id;
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data->bg_ptr = bg_ptr;
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data->mode = THERMAL_DEVICE_ENABLED;
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INIT_WORK(&data->thermal_wq, omap_thermal_work);
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return data;
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}
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int omap_thermal_expose_sensor(struct omap_bandgap *bg_ptr, int id,
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char *domain)
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{
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struct omap_thermal_data *data;
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data = omap_bandgap_get_sensor_data(bg_ptr, id);
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if (IS_ERR(data))
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data = omap_thermal_build_data(bg_ptr, id);
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if (!data)
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return -EINVAL;
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/* TODO: remove TC1 TC2 */
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/* Create thermal zone */
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data->omap_thermal = thermal_zone_device_register(domain,
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OMAP_TRIP_NUMBER, 0, data, &omap_thermal_ops,
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NULL, FAST_TEMP_MONITORING_RATE,
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FAST_TEMP_MONITORING_RATE);
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if (IS_ERR_OR_NULL(data->omap_thermal)) {
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dev_err(bg_ptr->dev, "thermal zone device is NULL\n");
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return PTR_ERR(data->omap_thermal);
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}
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data->omap_thermal->polling_delay = FAST_TEMP_MONITORING_RATE;
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omap_bandgap_set_sensor_data(bg_ptr, id, data);
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return 0;
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}
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int omap_thermal_remove_sensor(struct omap_bandgap *bg_ptr, int id)
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{
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struct omap_thermal_data *data;
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data = omap_bandgap_get_sensor_data(bg_ptr, id);
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thermal_zone_device_unregister(data->omap_thermal);
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return 0;
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}
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int omap_thermal_report_sensor_temperature(struct omap_bandgap *bg_ptr, int id)
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{
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struct omap_thermal_data *data;
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data = omap_bandgap_get_sensor_data(bg_ptr, id);
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schedule_work(&data->thermal_wq);
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return 0;
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}
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int omap_thermal_register_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
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{
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struct omap_thermal_data *data;
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data = omap_bandgap_get_sensor_data(bg_ptr, id);
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if (IS_ERR(data))
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data = omap_thermal_build_data(bg_ptr, id);
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if (!data)
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return -EINVAL;
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/* Register cooling device */
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data->cool_dev = cpufreq_cooling_register(cpu_present_mask);
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if (IS_ERR_OR_NULL(data->cool_dev)) {
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dev_err(bg_ptr->dev,
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"Failed to register cpufreq cooling device\n");
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return PTR_ERR(data->cool_dev);
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}
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omap_bandgap_set_sensor_data(bg_ptr, id, data);
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return 0;
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}
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int omap_thermal_unregister_cpu_cooling(struct omap_bandgap *bg_ptr, int id)
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{
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struct omap_thermal_data *data;
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data = omap_bandgap_get_sensor_data(bg_ptr, id);
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cpufreq_cooling_unregister(data->cool_dev);
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return 0;
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}
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