428 lines
11 KiB
C
428 lines
11 KiB
C
/*
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* exynos_thermal_common.c - Samsung EXYNOS common thermal file
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*
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* Copyright (C) 2013 Samsung Electronics
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* Amit Daniel Kachhap <amit.daniel@samsung.com>
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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; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/cpu_cooling.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/thermal.h>
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#include "exynos_thermal_common.h"
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struct exynos_thermal_zone {
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enum thermal_device_mode mode;
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struct thermal_zone_device *therm_dev;
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struct thermal_cooling_device *cool_dev[MAX_COOLING_DEVICE];
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unsigned int cool_dev_size;
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struct platform_device *exynos4_dev;
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struct thermal_sensor_conf *sensor_conf;
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bool bind;
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};
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/* Get mode callback functions for thermal zone */
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static int exynos_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 exynos_thermal_zone *th_zone = thermal->devdata;
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if (th_zone)
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*mode = th_zone->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 exynos_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 exynos_thermal_zone *th_zone = thermal->devdata;
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if (!th_zone) {
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dev_err(&thermal->device,
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"thermal zone not registered\n");
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return 0;
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}
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mutex_lock(&thermal->lock);
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if (mode == THERMAL_DEVICE_ENABLED &&
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!th_zone->sensor_conf->trip_data.trigger_falling)
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thermal->polling_delay = IDLE_INTERVAL;
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else
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thermal->polling_delay = 0;
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mutex_unlock(&thermal->lock);
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th_zone->mode = mode;
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thermal_zone_device_update(thermal);
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dev_dbg(th_zone->sensor_conf->dev,
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"thermal polling set for duration=%d msec\n",
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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 exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
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enum thermal_trip_type *type)
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{
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struct exynos_thermal_zone *th_zone = thermal->devdata;
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int max_trip = th_zone->sensor_conf->trip_data.trip_count;
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int trip_type;
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if (trip < 0 || trip >= max_trip)
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return -EINVAL;
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trip_type = th_zone->sensor_conf->trip_data.trip_type[trip];
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if (trip_type == SW_TRIP)
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*type = THERMAL_TRIP_CRITICAL;
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else if (trip_type == THROTTLE_ACTIVE)
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*type = THERMAL_TRIP_ACTIVE;
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else if (trip_type == THROTTLE_PASSIVE)
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*type = THERMAL_TRIP_PASSIVE;
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else
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return -EINVAL;
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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 exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
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unsigned long *temp)
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{
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struct exynos_thermal_zone *th_zone = thermal->devdata;
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int max_trip = th_zone->sensor_conf->trip_data.trip_count;
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if (trip < 0 || trip >= max_trip)
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return -EINVAL;
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*temp = th_zone->sensor_conf->trip_data.trip_val[trip];
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/* convert the temperature into millicelsius */
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*temp = *temp * MCELSIUS;
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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 exynos_get_crit_temp(struct thermal_zone_device *thermal,
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unsigned long *temp)
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{
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struct exynos_thermal_zone *th_zone = thermal->devdata;
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int max_trip = th_zone->sensor_conf->trip_data.trip_count;
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/* Get the temp of highest trip*/
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return exynos_get_trip_temp(thermal, max_trip - 1, temp);
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}
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/* Bind callback functions for thermal zone */
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static int exynos_bind(struct thermal_zone_device *thermal,
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struct thermal_cooling_device *cdev)
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{
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int ret = 0, i, tab_size, level;
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struct freq_clip_table *tab_ptr, *clip_data;
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struct exynos_thermal_zone *th_zone = thermal->devdata;
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struct thermal_sensor_conf *data = th_zone->sensor_conf;
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tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
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tab_size = data->cooling_data.freq_clip_count;
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if (tab_ptr == NULL || tab_size == 0)
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return 0;
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/* find the cooling device registered*/
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for (i = 0; i < th_zone->cool_dev_size; i++)
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if (cdev == th_zone->cool_dev[i])
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break;
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/* No matching cooling device */
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if (i == th_zone->cool_dev_size)
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return 0;
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/* Bind the thermal zone to the cpufreq cooling device */
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for (i = 0; i < tab_size; i++) {
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clip_data = (struct freq_clip_table *)&(tab_ptr[i]);
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level = cpufreq_cooling_get_level(0, clip_data->freq_clip_max);
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if (level == THERMAL_CSTATE_INVALID)
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return 0;
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switch (GET_ZONE(i)) {
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case MONITOR_ZONE:
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case WARN_ZONE:
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if (thermal_zone_bind_cooling_device(thermal, i, cdev,
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level, 0)) {
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dev_err(data->dev,
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"error unbinding cdev inst=%d\n", i);
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ret = -EINVAL;
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}
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th_zone->bind = true;
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break;
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default:
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ret = -EINVAL;
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}
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}
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return ret;
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}
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/* Unbind callback functions for thermal zone */
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static int exynos_unbind(struct thermal_zone_device *thermal,
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struct thermal_cooling_device *cdev)
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{
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int ret = 0, i, tab_size;
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struct exynos_thermal_zone *th_zone = thermal->devdata;
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struct thermal_sensor_conf *data = th_zone->sensor_conf;
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if (th_zone->bind == false)
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return 0;
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tab_size = data->cooling_data.freq_clip_count;
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if (tab_size == 0)
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return 0;
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/* find the cooling device registered*/
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for (i = 0; i < th_zone->cool_dev_size; i++)
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if (cdev == th_zone->cool_dev[i])
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break;
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/* No matching cooling device */
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if (i == th_zone->cool_dev_size)
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return 0;
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/* Bind the thermal zone to the cpufreq cooling device */
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for (i = 0; i < tab_size; i++) {
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switch (GET_ZONE(i)) {
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case MONITOR_ZONE:
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case WARN_ZONE:
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if (thermal_zone_unbind_cooling_device(thermal, i,
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cdev)) {
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dev_err(data->dev,
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"error unbinding cdev inst=%d\n", i);
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ret = -EINVAL;
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}
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th_zone->bind = false;
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break;
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default:
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ret = -EINVAL;
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}
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}
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return ret;
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}
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/* Get temperature callback functions for thermal zone */
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static int exynos_get_temp(struct thermal_zone_device *thermal,
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unsigned long *temp)
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{
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struct exynos_thermal_zone *th_zone = thermal->devdata;
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void *data;
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if (!th_zone->sensor_conf) {
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dev_err(&thermal->device,
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"Temperature sensor not initialised\n");
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return -EINVAL;
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}
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data = th_zone->sensor_conf->driver_data;
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*temp = th_zone->sensor_conf->read_temperature(data);
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/* convert the temperature into millicelsius */
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*temp = *temp * MCELSIUS;
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return 0;
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}
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/* Get temperature callback functions for thermal zone */
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static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
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unsigned long temp)
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{
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void *data;
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int ret = -EINVAL;
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struct exynos_thermal_zone *th_zone = thermal->devdata;
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if (!th_zone->sensor_conf) {
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dev_err(&thermal->device,
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"Temperature sensor not initialised\n");
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return -EINVAL;
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}
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data = th_zone->sensor_conf->driver_data;
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if (th_zone->sensor_conf->write_emul_temp)
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ret = th_zone->sensor_conf->write_emul_temp(data, temp);
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return ret;
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}
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/* Get the temperature trend */
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static int exynos_get_trend(struct thermal_zone_device *thermal,
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int trip, enum thermal_trend *trend)
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{
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int ret;
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unsigned long trip_temp;
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ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
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if (ret < 0)
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return ret;
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if (thermal->temperature >= trip_temp)
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*trend = THERMAL_TREND_RAISE_FULL;
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else
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*trend = THERMAL_TREND_DROP_FULL;
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return 0;
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}
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/* Operation callback functions for thermal zone */
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static struct thermal_zone_device_ops exynos_dev_ops = {
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.bind = exynos_bind,
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.unbind = exynos_unbind,
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.get_temp = exynos_get_temp,
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.set_emul_temp = exynos_set_emul_temp,
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.get_trend = exynos_get_trend,
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.get_mode = exynos_get_mode,
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.set_mode = exynos_set_mode,
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.get_trip_type = exynos_get_trip_type,
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.get_trip_temp = exynos_get_trip_temp,
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.get_crit_temp = exynos_get_crit_temp,
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};
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/*
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* This function may be called from interrupt based temperature sensor
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* when threshold is changed.
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*/
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void exynos_report_trigger(struct thermal_sensor_conf *conf)
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{
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unsigned int i;
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char data[10];
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char *envp[] = { data, NULL };
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struct exynos_thermal_zone *th_zone;
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if (!conf || !conf->pzone_data) {
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pr_err("Invalid temperature sensor configuration data\n");
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return;
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}
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th_zone = conf->pzone_data;
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if (th_zone->bind == false) {
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for (i = 0; i < th_zone->cool_dev_size; i++) {
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if (!th_zone->cool_dev[i])
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continue;
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exynos_bind(th_zone->therm_dev,
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th_zone->cool_dev[i]);
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}
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}
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thermal_zone_device_update(th_zone->therm_dev);
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mutex_lock(&th_zone->therm_dev->lock);
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/* Find the level for which trip happened */
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for (i = 0; i < th_zone->sensor_conf->trip_data.trip_count; i++) {
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if (th_zone->therm_dev->last_temperature <
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th_zone->sensor_conf->trip_data.trip_val[i] * MCELSIUS)
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break;
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}
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if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
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!th_zone->sensor_conf->trip_data.trigger_falling) {
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if (i > 0)
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th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
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else
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th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
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}
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snprintf(data, sizeof(data), "%u", i);
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kobject_uevent_env(&th_zone->therm_dev->device.kobj, KOBJ_CHANGE, envp);
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mutex_unlock(&th_zone->therm_dev->lock);
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}
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/* Register with the in-kernel thermal management */
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int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
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{
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int ret;
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struct cpumask mask_val;
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struct exynos_thermal_zone *th_zone;
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if (!sensor_conf || !sensor_conf->read_temperature) {
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pr_err("Temperature sensor not initialised\n");
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return -EINVAL;
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}
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th_zone = devm_kzalloc(sensor_conf->dev,
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sizeof(struct exynos_thermal_zone), GFP_KERNEL);
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if (!th_zone)
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return -ENOMEM;
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th_zone->sensor_conf = sensor_conf;
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/*
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* TODO: 1) Handle multiple cooling devices in a thermal zone
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* 2) Add a flag/name in cooling info to map to specific
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* sensor
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*/
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if (sensor_conf->cooling_data.freq_clip_count > 0) {
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cpumask_set_cpu(0, &mask_val);
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th_zone->cool_dev[th_zone->cool_dev_size] =
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cpufreq_cooling_register(&mask_val);
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if (IS_ERR(th_zone->cool_dev[th_zone->cool_dev_size])) {
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dev_err(sensor_conf->dev,
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"Failed to register cpufreq cooling device\n");
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ret = -EINVAL;
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goto err_unregister;
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}
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th_zone->cool_dev_size++;
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}
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th_zone->therm_dev = thermal_zone_device_register(
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sensor_conf->name, sensor_conf->trip_data.trip_count,
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0, th_zone, &exynos_dev_ops, NULL, 0,
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sensor_conf->trip_data.trigger_falling ? 0 :
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IDLE_INTERVAL);
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if (IS_ERR(th_zone->therm_dev)) {
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dev_err(sensor_conf->dev,
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"Failed to register thermal zone device\n");
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ret = PTR_ERR(th_zone->therm_dev);
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goto err_unregister;
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}
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th_zone->mode = THERMAL_DEVICE_ENABLED;
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sensor_conf->pzone_data = th_zone;
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dev_info(sensor_conf->dev,
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"Exynos: Thermal zone(%s) registered\n", sensor_conf->name);
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return 0;
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err_unregister:
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exynos_unregister_thermal(sensor_conf);
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return ret;
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}
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/* Un-Register with the in-kernel thermal management */
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void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf)
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{
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int i;
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struct exynos_thermal_zone *th_zone;
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if (!sensor_conf || !sensor_conf->pzone_data) {
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pr_err("Invalid temperature sensor configuration data\n");
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return;
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}
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th_zone = sensor_conf->pzone_data;
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thermal_zone_device_unregister(th_zone->therm_dev);
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for (i = 0; i < th_zone->cool_dev_size; ++i)
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cpufreq_cooling_unregister(th_zone->cool_dev[i]);
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dev_info(sensor_conf->dev,
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"Exynos: Kernel Thermal management unregistered\n");
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}
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