287 строки
6.8 KiB
C
287 строки
6.8 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 <linux/of.h>
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#include "ti-thermal.h"
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#include "ti-bandgap.h"
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/* common data structures */
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struct ti_thermal_data {
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struct cpufreq_policy *policy;
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struct thermal_zone_device *ti_thermal;
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struct thermal_zone_device *pcb_tz;
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struct thermal_cooling_device *cool_dev;
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struct ti_bandgap *bgp;
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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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bool our_zone;
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};
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static void ti_thermal_work(struct work_struct *work)
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{
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struct ti_thermal_data *data = container_of(work,
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struct ti_thermal_data, thermal_wq);
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thermal_zone_device_update(data->ti_thermal, THERMAL_EVENT_UNSPECIFIED);
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dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
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data->ti_thermal->type);
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}
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/**
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* ti_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 ti_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 __ti_thermal_get_temp(void *devdata, int *temp)
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{
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struct thermal_zone_device *pcb_tz = NULL;
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struct ti_thermal_data *data = devdata;
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struct ti_bandgap *bgp;
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const struct ti_temp_sensor *s;
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int ret, tmp, slope, constant;
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int pcb_temp;
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if (!data)
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return 0;
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bgp = data->bgp;
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s = &bgp->conf->sensors[data->sensor_id];
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ret = ti_bandgap_read_temperature(bgp, data->sensor_id, &tmp);
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if (ret)
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return ret;
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/* Default constants */
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slope = thermal_zone_get_slope(data->ti_thermal);
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constant = thermal_zone_get_offset(data->ti_thermal);
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pcb_tz = data->pcb_tz;
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/* In case pcb zone is available, use the extrapolation rule with it */
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if (!IS_ERR(pcb_tz)) {
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ret = thermal_zone_get_temp(pcb_tz, &pcb_temp);
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if (!ret) {
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tmp -= pcb_temp; /* got a valid 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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dev_err(bgp->dev,
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"Failed to read PCB state. Using defaults\n");
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ret = 0;
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}
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}
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*temp = ti_thermal_hotspot_temperature(tmp, slope, constant);
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return ret;
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}
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static inline int ti_thermal_get_temp(struct thermal_zone_device *thermal,
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int *temp)
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{
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struct ti_thermal_data *data = thermal->devdata;
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return __ti_thermal_get_temp(data, temp);
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}
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static int __ti_thermal_get_trend(void *p, int trip, enum thermal_trend *trend)
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{
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struct ti_thermal_data *data = p;
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struct ti_bandgap *bgp;
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int id, tr, ret = 0;
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bgp = data->bgp;
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id = data->sensor_id;
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ret = ti_bandgap_get_trend(bgp, id, &tr);
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if (ret)
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return ret;
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if (tr > 0)
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*trend = THERMAL_TREND_RAISING;
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else if (tr < 0)
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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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return 0;
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}
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static const struct thermal_zone_of_device_ops ti_of_thermal_ops = {
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.get_temp = __ti_thermal_get_temp,
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.get_trend = __ti_thermal_get_trend,
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};
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static struct ti_thermal_data
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*ti_thermal_build_data(struct ti_bandgap *bgp, int id)
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{
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struct ti_thermal_data *data;
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data = devm_kzalloc(bgp->dev, sizeof(*data), GFP_KERNEL);
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if (!data) {
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dev_err(bgp->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->bgp = bgp;
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data->mode = THERMAL_DEVICE_ENABLED;
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/* pcb_tz will be either valid or PTR_ERR() */
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data->pcb_tz = thermal_zone_get_zone_by_name("pcb");
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INIT_WORK(&data->thermal_wq, ti_thermal_work);
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return data;
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}
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int ti_thermal_expose_sensor(struct ti_bandgap *bgp, int id,
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char *domain)
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{
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struct ti_thermal_data *data;
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data = ti_bandgap_get_sensor_data(bgp, id);
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if (!data || IS_ERR(data))
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data = ti_thermal_build_data(bgp, id);
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if (!data)
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return -EINVAL;
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/* in case this is specified by DT */
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data->ti_thermal = devm_thermal_zone_of_sensor_register(bgp->dev, id,
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data, &ti_of_thermal_ops);
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if (IS_ERR(data->ti_thermal)) {
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dev_err(bgp->dev, "thermal zone device is NULL\n");
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return PTR_ERR(data->ti_thermal);
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}
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ti_bandgap_set_sensor_data(bgp, id, data);
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ti_bandgap_write_update_interval(bgp, data->sensor_id,
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data->ti_thermal->polling_delay);
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return 0;
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}
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int ti_thermal_remove_sensor(struct ti_bandgap *bgp, int id)
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{
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struct ti_thermal_data *data;
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data = ti_bandgap_get_sensor_data(bgp, id);
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if (data && data->ti_thermal) {
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if (data->our_zone)
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thermal_zone_device_unregister(data->ti_thermal);
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}
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return 0;
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}
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int ti_thermal_report_sensor_temperature(struct ti_bandgap *bgp, int id)
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{
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struct ti_thermal_data *data;
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data = ti_bandgap_get_sensor_data(bgp, 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 ti_thermal_register_cpu_cooling(struct ti_bandgap *bgp, int id)
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{
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struct ti_thermal_data *data;
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struct device_node *np = bgp->dev->of_node;
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/*
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* We are assuming here that if one deploys the zone
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* using DT, then it must be aware that the cooling device
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* loading has to happen via cpufreq driver.
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*/
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if (of_find_property(np, "#thermal-sensor-cells", NULL))
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return 0;
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data = ti_bandgap_get_sensor_data(bgp, id);
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if (!data || IS_ERR(data))
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data = ti_thermal_build_data(bgp, id);
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if (!data)
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return -EINVAL;
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data->policy = cpufreq_cpu_get(0);
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if (!data->policy) {
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pr_debug("%s: CPUFreq policy not found\n", __func__);
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return -EPROBE_DEFER;
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}
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/* Register cooling device */
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data->cool_dev = cpufreq_cooling_register(data->policy);
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if (IS_ERR(data->cool_dev)) {
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int ret = PTR_ERR(data->cool_dev);
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dev_err(bgp->dev, "Failed to register cpu cooling device %d\n",
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ret);
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cpufreq_cpu_put(data->policy);
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return ret;
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}
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ti_bandgap_set_sensor_data(bgp, id, data);
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return 0;
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}
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int ti_thermal_unregister_cpu_cooling(struct ti_bandgap *bgp, int id)
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{
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struct ti_thermal_data *data;
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data = ti_bandgap_get_sensor_data(bgp, id);
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if (data) {
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cpufreq_cooling_unregister(data->cool_dev);
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if (data->policy)
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cpufreq_cpu_put(data->policy);
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}
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return 0;
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}
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