2 * exynos_thermal_common.c - Samsung EXYNOS common thermal file
4 * Copyright (C) 2013 Samsung Electronics
5 * Amit Daniel Kachhap <amit.daniel@samsung.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/cpu_cooling.h>
24 #include <linux/err.h>
25 #include <linux/slab.h>
26 #include <linux/thermal.h>
28 #include "exynos_thermal_common.h"
30 struct exynos_thermal_zone {
31 enum thermal_device_mode mode;
32 struct thermal_zone_device *therm_dev;
33 struct thermal_cooling_device *cool_dev[MAX_COOLING_DEVICE];
34 unsigned int cool_dev_size;
35 struct platform_device *exynos4_dev;
36 struct thermal_sensor_conf *sensor_conf;
40 /* Get mode callback functions for thermal zone */
41 static int exynos_get_mode(struct thermal_zone_device *thermal,
42 enum thermal_device_mode *mode)
44 struct exynos_thermal_zone *th_zone = thermal->devdata;
46 *mode = th_zone->mode;
50 /* Set mode callback functions for thermal zone */
51 static int exynos_set_mode(struct thermal_zone_device *thermal,
52 enum thermal_device_mode mode)
54 struct exynos_thermal_zone *th_zone = thermal->devdata;
56 dev_err(&thermal->device,
57 "thermal zone not registered\n");
61 mutex_lock(&thermal->lock);
63 if (mode == THERMAL_DEVICE_ENABLED &&
64 !th_zone->sensor_conf->trip_data.trigger_falling)
65 thermal->polling_delay = IDLE_INTERVAL;
67 thermal->polling_delay = 0;
69 mutex_unlock(&thermal->lock);
72 thermal_zone_device_update(thermal);
73 dev_dbg(th_zone->sensor_conf->dev,
74 "thermal polling set for duration=%d msec\n",
75 thermal->polling_delay);
80 /* Get trip type callback functions for thermal zone */
81 static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
82 enum thermal_trip_type *type)
84 struct exynos_thermal_zone *th_zone = thermal->devdata;
85 int max_trip = th_zone->sensor_conf->trip_data.trip_count;
88 if (trip < 0 || trip >= max_trip)
91 trip_type = th_zone->sensor_conf->trip_data.trip_type[trip];
93 if (trip_type == SW_TRIP)
94 *type = THERMAL_TRIP_CRITICAL;
95 else if (trip_type == THROTTLE_ACTIVE)
96 *type = THERMAL_TRIP_ACTIVE;
97 else if (trip_type == THROTTLE_PASSIVE)
98 *type = THERMAL_TRIP_PASSIVE;
105 /* Get trip temperature callback functions for thermal zone */
106 static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
109 struct exynos_thermal_zone *th_zone = thermal->devdata;
110 int max_trip = th_zone->sensor_conf->trip_data.trip_count;
112 if (trip < 0 || trip >= max_trip)
115 *temp = th_zone->sensor_conf->trip_data.trip_val[trip];
116 /* convert the temperature into millicelsius */
117 *temp = *temp * MCELSIUS;
122 /* Get critical temperature callback functions for thermal zone */
123 static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
126 struct exynos_thermal_zone *th_zone = thermal->devdata;
127 int max_trip = th_zone->sensor_conf->trip_data.trip_count;
128 /* Get the temp of highest trip*/
129 return exynos_get_trip_temp(thermal, max_trip - 1, temp);
132 /* Bind callback functions for thermal zone */
133 static int exynos_bind(struct thermal_zone_device *thermal,
134 struct thermal_cooling_device *cdev)
136 int ret = 0, i, tab_size, level;
137 struct freq_clip_table *tab_ptr, *clip_data;
138 struct exynos_thermal_zone *th_zone = thermal->devdata;
139 struct thermal_sensor_conf *data = th_zone->sensor_conf;
141 tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
142 tab_size = data->cooling_data.freq_clip_count;
144 if (tab_ptr == NULL || tab_size == 0)
147 /* find the cooling device registered*/
148 for (i = 0; i < th_zone->cool_dev_size; i++)
149 if (cdev == th_zone->cool_dev[i])
152 /* No matching cooling device */
153 if (i == th_zone->cool_dev_size)
156 /* Bind the thermal zone to the cpufreq cooling device */
157 for (i = 0; i < tab_size; i++) {
158 clip_data = (struct freq_clip_table *)&(tab_ptr[i]);
159 level = cpufreq_cooling_get_level(0, clip_data->freq_clip_max);
160 if (level == THERMAL_CSTATE_INVALID)
162 switch (GET_ZONE(i)) {
165 if (thermal_zone_bind_cooling_device(thermal, i, cdev,
168 "error unbinding cdev inst=%d\n", i);
171 th_zone->bind = true;
181 /* Unbind callback functions for thermal zone */
182 static int exynos_unbind(struct thermal_zone_device *thermal,
183 struct thermal_cooling_device *cdev)
185 int ret = 0, i, tab_size;
186 struct exynos_thermal_zone *th_zone = thermal->devdata;
187 struct thermal_sensor_conf *data = th_zone->sensor_conf;
189 if (th_zone->bind == false)
192 tab_size = data->cooling_data.freq_clip_count;
197 /* find the cooling device registered*/
198 for (i = 0; i < th_zone->cool_dev_size; i++)
199 if (cdev == th_zone->cool_dev[i])
202 /* No matching cooling device */
203 if (i == th_zone->cool_dev_size)
206 /* Bind the thermal zone to the cpufreq cooling device */
207 for (i = 0; i < tab_size; i++) {
208 switch (GET_ZONE(i)) {
211 if (thermal_zone_unbind_cooling_device(thermal, i,
214 "error unbinding cdev inst=%d\n", i);
217 th_zone->bind = false;
226 /* Get temperature callback functions for thermal zone */
227 static int exynos_get_temp(struct thermal_zone_device *thermal,
230 struct exynos_thermal_zone *th_zone = thermal->devdata;
233 if (!th_zone->sensor_conf) {
234 dev_err(&thermal->device,
235 "Temperature sensor not initialised\n");
238 data = th_zone->sensor_conf->driver_data;
239 *temp = th_zone->sensor_conf->read_temperature(data);
240 /* convert the temperature into millicelsius */
241 *temp = *temp * MCELSIUS;
245 /* Get temperature callback functions for thermal zone */
246 static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
251 struct exynos_thermal_zone *th_zone = thermal->devdata;
253 if (!th_zone->sensor_conf) {
254 dev_err(&thermal->device,
255 "Temperature sensor not initialised\n");
258 data = th_zone->sensor_conf->driver_data;
259 if (th_zone->sensor_conf->write_emul_temp)
260 ret = th_zone->sensor_conf->write_emul_temp(data, temp);
264 /* Get the temperature trend */
265 static int exynos_get_trend(struct thermal_zone_device *thermal,
266 int trip, enum thermal_trend *trend)
269 unsigned long trip_temp;
271 ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
275 if (thermal->temperature >= trip_temp)
276 *trend = THERMAL_TREND_RAISE_FULL;
278 *trend = THERMAL_TREND_DROP_FULL;
282 /* Operation callback functions for thermal zone */
283 static struct thermal_zone_device_ops exynos_dev_ops = {
285 .unbind = exynos_unbind,
286 .get_temp = exynos_get_temp,
287 .set_emul_temp = exynos_set_emul_temp,
288 .get_trend = exynos_get_trend,
289 .get_mode = exynos_get_mode,
290 .set_mode = exynos_set_mode,
291 .get_trip_type = exynos_get_trip_type,
292 .get_trip_temp = exynos_get_trip_temp,
293 .get_crit_temp = exynos_get_crit_temp,
297 * This function may be called from interrupt based temperature sensor
298 * when threshold is changed.
300 void exynos_report_trigger(struct thermal_sensor_conf *conf)
304 char *envp[] = { data, NULL };
305 struct exynos_thermal_zone *th_zone;
307 if (!conf || !conf->pzone_data) {
308 pr_err("Invalid temperature sensor configuration data\n");
312 th_zone = conf->pzone_data;
314 if (th_zone->bind == false) {
315 for (i = 0; i < th_zone->cool_dev_size; i++) {
316 if (!th_zone->cool_dev[i])
318 exynos_bind(th_zone->therm_dev,
319 th_zone->cool_dev[i]);
323 thermal_zone_device_update(th_zone->therm_dev);
325 mutex_lock(&th_zone->therm_dev->lock);
326 /* Find the level for which trip happened */
327 for (i = 0; i < th_zone->sensor_conf->trip_data.trip_count; i++) {
328 if (th_zone->therm_dev->last_temperature <
329 th_zone->sensor_conf->trip_data.trip_val[i] * MCELSIUS)
333 if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
334 !th_zone->sensor_conf->trip_data.trigger_falling) {
336 th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
338 th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
341 snprintf(data, sizeof(data), "%u", i);
342 kobject_uevent_env(&th_zone->therm_dev->device.kobj, KOBJ_CHANGE, envp);
343 mutex_unlock(&th_zone->therm_dev->lock);
346 /* Register with the in-kernel thermal management */
347 int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
350 struct exynos_thermal_zone *th_zone;
352 if (!sensor_conf || !sensor_conf->read_temperature) {
353 pr_err("Temperature sensor not initialised\n");
357 th_zone = devm_kzalloc(sensor_conf->dev,
358 sizeof(struct exynos_thermal_zone), GFP_KERNEL);
362 th_zone->sensor_conf = sensor_conf;
364 * TODO: 1) Handle multiple cooling devices in a thermal zone
365 * 2) Add a flag/name in cooling info to map to specific
368 if (sensor_conf->cooling_data.freq_clip_count > 0) {
369 th_zone->cool_dev[th_zone->cool_dev_size] =
370 cpufreq_cooling_register(cpu_present_mask);
371 if (IS_ERR(th_zone->cool_dev[th_zone->cool_dev_size])) {
372 ret = PTR_ERR(th_zone->cool_dev[th_zone->cool_dev_size]);
373 if (ret != -EPROBE_DEFER)
374 dev_err(sensor_conf->dev,
375 "Failed to register cpufreq cooling device: %d\n",
379 th_zone->cool_dev_size++;
382 th_zone->therm_dev = thermal_zone_device_register(
383 sensor_conf->name, sensor_conf->trip_data.trip_count,
384 0, th_zone, &exynos_dev_ops, NULL, 0,
385 sensor_conf->trip_data.trigger_falling ? 0 :
388 if (IS_ERR(th_zone->therm_dev)) {
389 dev_err(sensor_conf->dev,
390 "Failed to register thermal zone device\n");
391 ret = PTR_ERR(th_zone->therm_dev);
394 th_zone->mode = THERMAL_DEVICE_ENABLED;
395 sensor_conf->pzone_data = th_zone;
397 dev_info(sensor_conf->dev,
398 "Exynos: Thermal zone(%s) registered\n", sensor_conf->name);
403 exynos_unregister_thermal(sensor_conf);
407 /* Un-Register with the in-kernel thermal management */
408 void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf)
411 struct exynos_thermal_zone *th_zone;
413 if (!sensor_conf || !sensor_conf->pzone_data) {
414 pr_err("Invalid temperature sensor configuration data\n");
418 th_zone = sensor_conf->pzone_data;
420 thermal_zone_device_unregister(th_zone->therm_dev);
422 for (i = 0; i < th_zone->cool_dev_size; ++i)
423 cpufreq_cooling_unregister(th_zone->cool_dev[i]);
425 dev_info(sensor_conf->dev,
426 "Exynos: Kernel Thermal management unregistered\n");