1 /*
2 * exynos_thermal_common.c - Samsung EXYNOS common thermal file
3 *
4 * Copyright (C) 2013 Samsung Electronics
5 * Amit Daniel Kachhap <amit.daniel@samsung.com>
6 *
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.
11 *
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.
16 *
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
20 *
21 */
22
23 #include <linux/cpu_cooling.h>
24 #include <linux/err.h>
25 #include <linux/slab.h>
26 #include <linux/thermal.h>
27
28 #include "exynos_thermal_common.h"
29
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;
37 bool bind;
38 };
39
40 /* Get mode callback functions for thermal zone */
exynos_get_mode(struct thermal_zone_device * thermal,enum thermal_device_mode * mode)41 static int exynos_get_mode(struct thermal_zone_device *thermal,
42 enum thermal_device_mode *mode)
43 {
44 struct exynos_thermal_zone *th_zone = thermal->devdata;
45 if (th_zone)
46 *mode = th_zone->mode;
47 return 0;
48 }
49
50 /* Set mode callback functions for thermal zone */
exynos_set_mode(struct thermal_zone_device * thermal,enum thermal_device_mode mode)51 static int exynos_set_mode(struct thermal_zone_device *thermal,
52 enum thermal_device_mode mode)
53 {
54 struct exynos_thermal_zone *th_zone = thermal->devdata;
55 if (!th_zone) {
56 dev_err(&thermal->device,
57 "thermal zone not registered\n");
58 return 0;
59 }
60
61 mutex_lock(&thermal->lock);
62
63 if (mode == THERMAL_DEVICE_ENABLED &&
64 !th_zone->sensor_conf->trip_data.trigger_falling)
65 thermal->polling_delay = IDLE_INTERVAL;
66 else
67 thermal->polling_delay = 0;
68
69 mutex_unlock(&thermal->lock);
70
71 th_zone->mode = mode;
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);
76 return 0;
77 }
78
79
80 /* Get trip type callback functions for thermal zone */
exynos_get_trip_type(struct thermal_zone_device * thermal,int trip,enum thermal_trip_type * type)81 static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
82 enum thermal_trip_type *type)
83 {
84 struct exynos_thermal_zone *th_zone = thermal->devdata;
85 int max_trip = th_zone->sensor_conf->trip_data.trip_count;
86 int trip_type;
87
88 if (trip < 0 || trip >= max_trip)
89 return -EINVAL;
90
91 trip_type = th_zone->sensor_conf->trip_data.trip_type[trip];
92
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;
99 else
100 return -EINVAL;
101
102 return 0;
103 }
104
105 /* Get trip temperature callback functions for thermal zone */
exynos_get_trip_temp(struct thermal_zone_device * thermal,int trip,unsigned long * temp)106 static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
107 unsigned long *temp)
108 {
109 struct exynos_thermal_zone *th_zone = thermal->devdata;
110 int max_trip = th_zone->sensor_conf->trip_data.trip_count;
111
112 if (trip < 0 || trip >= max_trip)
113 return -EINVAL;
114
115 *temp = th_zone->sensor_conf->trip_data.trip_val[trip];
116 /* convert the temperature into millicelsius */
117 *temp = *temp * MCELSIUS;
118
119 return 0;
120 }
121
122 /* Get critical temperature callback functions for thermal zone */
exynos_get_crit_temp(struct thermal_zone_device * thermal,unsigned long * temp)123 static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
124 unsigned long *temp)
125 {
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);
130 }
131
132 /* Bind callback functions for thermal zone */
exynos_bind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)133 static int exynos_bind(struct thermal_zone_device *thermal,
134 struct thermal_cooling_device *cdev)
135 {
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;
140
141 tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
142 tab_size = data->cooling_data.freq_clip_count;
143
144 if (tab_ptr == NULL || tab_size == 0)
145 return 0;
146
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])
150 break;
151
152 /* No matching cooling device */
153 if (i == th_zone->cool_dev_size)
154 return 0;
155
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)
161 return 0;
162 switch (GET_ZONE(i)) {
163 case MONITOR_ZONE:
164 case WARN_ZONE:
165 if (thermal_zone_bind_cooling_device(thermal, i, cdev,
166 level, 0)) {
167 dev_err(data->dev,
168 "error unbinding cdev inst=%d\n", i);
169 ret = -EINVAL;
170 }
171 th_zone->bind = true;
172 break;
173 default:
174 ret = -EINVAL;
175 }
176 }
177
178 return ret;
179 }
180
181 /* Unbind callback functions for thermal zone */
exynos_unbind(struct thermal_zone_device * thermal,struct thermal_cooling_device * cdev)182 static int exynos_unbind(struct thermal_zone_device *thermal,
183 struct thermal_cooling_device *cdev)
184 {
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;
188
189 if (th_zone->bind == false)
190 return 0;
191
192 tab_size = data->cooling_data.freq_clip_count;
193
194 if (tab_size == 0)
195 return 0;
196
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])
200 break;
201
202 /* No matching cooling device */
203 if (i == th_zone->cool_dev_size)
204 return 0;
205
206 /* Bind the thermal zone to the cpufreq cooling device */
207 for (i = 0; i < tab_size; i++) {
208 switch (GET_ZONE(i)) {
209 case MONITOR_ZONE:
210 case WARN_ZONE:
211 if (thermal_zone_unbind_cooling_device(thermal, i,
212 cdev)) {
213 dev_err(data->dev,
214 "error unbinding cdev inst=%d\n", i);
215 ret = -EINVAL;
216 }
217 th_zone->bind = false;
218 break;
219 default:
220 ret = -EINVAL;
221 }
222 }
223 return ret;
224 }
225
226 /* Get temperature callback functions for thermal zone */
exynos_get_temp(struct thermal_zone_device * thermal,unsigned long * temp)227 static int exynos_get_temp(struct thermal_zone_device *thermal,
228 unsigned long *temp)
229 {
230 struct exynos_thermal_zone *th_zone = thermal->devdata;
231 void *data;
232
233 if (!th_zone->sensor_conf) {
234 dev_err(&thermal->device,
235 "Temperature sensor not initialised\n");
236 return -EINVAL;
237 }
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;
242 return 0;
243 }
244
245 /* Get temperature callback functions for thermal zone */
exynos_set_emul_temp(struct thermal_zone_device * thermal,unsigned long temp)246 static int exynos_set_emul_temp(struct thermal_zone_device *thermal,
247 unsigned long temp)
248 {
249 void *data;
250 int ret = -EINVAL;
251 struct exynos_thermal_zone *th_zone = thermal->devdata;
252
253 if (!th_zone->sensor_conf) {
254 dev_err(&thermal->device,
255 "Temperature sensor not initialised\n");
256 return -EINVAL;
257 }
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);
261 return ret;
262 }
263
264 /* Get the temperature trend */
exynos_get_trend(struct thermal_zone_device * thermal,int trip,enum thermal_trend * trend)265 static int exynos_get_trend(struct thermal_zone_device *thermal,
266 int trip, enum thermal_trend *trend)
267 {
268 int ret;
269 unsigned long trip_temp;
270
271 ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
272 if (ret < 0)
273 return ret;
274
275 if (thermal->temperature >= trip_temp)
276 *trend = THERMAL_TREND_RAISE_FULL;
277 else
278 *trend = THERMAL_TREND_DROP_FULL;
279
280 return 0;
281 }
282 /* Operation callback functions for thermal zone */
283 static struct thermal_zone_device_ops exynos_dev_ops = {
284 .bind = exynos_bind,
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,
294 };
295
296 /*
297 * This function may be called from interrupt based temperature sensor
298 * when threshold is changed.
299 */
exynos_report_trigger(struct thermal_sensor_conf * conf)300 void exynos_report_trigger(struct thermal_sensor_conf *conf)
301 {
302 unsigned int i;
303 char data[10];
304 char *envp[] = { data, NULL };
305 struct exynos_thermal_zone *th_zone;
306
307 if (!conf || !conf->pzone_data) {
308 pr_err("Invalid temperature sensor configuration data\n");
309 return;
310 }
311
312 th_zone = conf->pzone_data;
313
314 if (th_zone->bind == false) {
315 for (i = 0; i < th_zone->cool_dev_size; i++) {
316 if (!th_zone->cool_dev[i])
317 continue;
318 exynos_bind(th_zone->therm_dev,
319 th_zone->cool_dev[i]);
320 }
321 }
322
323 thermal_zone_device_update(th_zone->therm_dev);
324
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)
330 break;
331 }
332
333 if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
334 !th_zone->sensor_conf->trip_data.trigger_falling) {
335 if (i > 0)
336 th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
337 else
338 th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
339 }
340
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);
344 }
345
346 /* Register with the in-kernel thermal management */
exynos_register_thermal(struct thermal_sensor_conf * sensor_conf)347 int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
348 {
349 int ret;
350 struct cpumask mask_val;
351 struct exynos_thermal_zone *th_zone;
352
353 if (!sensor_conf || !sensor_conf->read_temperature) {
354 pr_err("Temperature sensor not initialised\n");
355 return -EINVAL;
356 }
357
358 th_zone = devm_kzalloc(sensor_conf->dev,
359 sizeof(struct exynos_thermal_zone), GFP_KERNEL);
360 if (!th_zone)
361 return -ENOMEM;
362
363 th_zone->sensor_conf = sensor_conf;
364 /*
365 * TODO: 1) Handle multiple cooling devices in a thermal zone
366 * 2) Add a flag/name in cooling info to map to specific
367 * sensor
368 */
369 if (sensor_conf->cooling_data.freq_clip_count > 0) {
370 cpumask_set_cpu(0, &mask_val);
371 th_zone->cool_dev[th_zone->cool_dev_size] =
372 cpufreq_cooling_register(&mask_val);
373 if (IS_ERR(th_zone->cool_dev[th_zone->cool_dev_size])) {
374 dev_err(sensor_conf->dev,
375 "Failed to register cpufreq cooling device\n");
376 ret = -EINVAL;
377 goto err_unregister;
378 }
379 th_zone->cool_dev_size++;
380 }
381
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 :
386 IDLE_INTERVAL);
387
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);
392 goto err_unregister;
393 }
394 th_zone->mode = THERMAL_DEVICE_ENABLED;
395 sensor_conf->pzone_data = th_zone;
396
397 dev_info(sensor_conf->dev,
398 "Exynos: Thermal zone(%s) registered\n", sensor_conf->name);
399
400 return 0;
401
402 err_unregister:
403 exynos_unregister_thermal(sensor_conf);
404 return ret;
405 }
406
407 /* Un-Register with the in-kernel thermal management */
exynos_unregister_thermal(struct thermal_sensor_conf * sensor_conf)408 void exynos_unregister_thermal(struct thermal_sensor_conf *sensor_conf)
409 {
410 int i;
411 struct exynos_thermal_zone *th_zone;
412
413 if (!sensor_conf || !sensor_conf->pzone_data) {
414 pr_err("Invalid temperature sensor configuration data\n");
415 return;
416 }
417
418 th_zone = sensor_conf->pzone_data;
419
420 thermal_zone_device_unregister(th_zone->therm_dev);
421
422 for (i = 0; i < th_zone->cool_dev_size; ++i)
423 cpufreq_cooling_unregister(th_zone->cool_dev[i]);
424
425 dev_info(sensor_conf->dev,
426 "Exynos: Kernel Thermal management unregistered\n");
427 }
428