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Zhang Rui203d3d42008-01-17 15:51:08 +08001/*
2 * thermal.c - Generic Thermal Management Sysfs support.
3 *
4 * Copyright (C) 2008 Intel Corp
5 * Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
6 * Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
7 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2 of the License.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
22 *
23 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
24 */
25
Joe Perchesc5a01dd2012-03-21 12:55:02 -070026#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
27
Zhang Rui203d3d42008-01-17 15:51:08 +080028#include <linux/module.h>
29#include <linux/device.h>
30#include <linux/err.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090031#include <linux/slab.h>
Zhang Rui203d3d42008-01-17 15:51:08 +080032#include <linux/kdev_t.h>
33#include <linux/idr.h>
34#include <linux/thermal.h>
Matthew Garrettb1569e92008-12-03 17:55:32 +000035#include <linux/reboot.h>
Andy Shevchenko42a5bf52013-05-17 11:52:02 +000036#include <linux/string.h>
Eduardo Valentina116b5d2013-09-26 15:55:01 -040037#include <linux/of.h>
R.Durgadoss4cb18722010-10-27 03:33:29 +053038#include <net/netlink.h>
39#include <net/genetlink.h>
Zhang Rui203d3d42008-01-17 15:51:08 +080040
Punit Agrawal100a8fd2014-07-29 11:50:48 +010041#define CREATE_TRACE_POINTS
42#include <trace/events/thermal.h>
43
Durgadoss R71350db2012-09-18 11:04:53 +053044#include "thermal_core.h"
Eduardo Valentin0dd88792013-07-03 15:14:28 -040045#include "thermal_hwmon.h"
Durgadoss R71350db2012-09-18 11:04:53 +053046
Zhang Rui63c4ec92008-04-21 16:07:13 +080047MODULE_AUTHOR("Zhang Rui");
Zhang Rui203d3d42008-01-17 15:51:08 +080048MODULE_DESCRIPTION("Generic thermal management sysfs support");
Eduardo Valentin6d8d4972013-04-23 21:48:13 +000049MODULE_LICENSE("GPL v2");
Zhang Rui203d3d42008-01-17 15:51:08 +080050
Zhang Rui203d3d42008-01-17 15:51:08 +080051static DEFINE_IDR(thermal_tz_idr);
52static DEFINE_IDR(thermal_cdev_idr);
53static DEFINE_MUTEX(thermal_idr_lock);
54
55static LIST_HEAD(thermal_tz_list);
56static LIST_HEAD(thermal_cdev_list);
Durgadoss Ra4a15482012-09-18 11:04:57 +053057static LIST_HEAD(thermal_governor_list);
58
Zhang Rui203d3d42008-01-17 15:51:08 +080059static DEFINE_MUTEX(thermal_list_lock);
Durgadoss Ra4a15482012-09-18 11:04:57 +053060static DEFINE_MUTEX(thermal_governor_lock);
61
Zhang Ruif2234bc2014-01-24 10:23:19 +080062static struct thermal_governor *def_governor;
63
Durgadoss Ra4a15482012-09-18 11:04:57 +053064static struct thermal_governor *__find_governor(const char *name)
65{
66 struct thermal_governor *pos;
67
Zhang Ruif2234bc2014-01-24 10:23:19 +080068 if (!name || !name[0])
69 return def_governor;
70
Durgadoss Ra4a15482012-09-18 11:04:57 +053071 list_for_each_entry(pos, &thermal_governor_list, governor_list)
Rasmus Villemoes484ac2f2014-10-13 15:55:01 -070072 if (!strncasecmp(name, pos->name, THERMAL_NAME_LENGTH))
Durgadoss Ra4a15482012-09-18 11:04:57 +053073 return pos;
74
75 return NULL;
76}
77
Javi Merinoe33df1d2015-02-26 19:00:27 +000078/**
79 * bind_previous_governor() - bind the previous governor of the thermal zone
80 * @tz: a valid pointer to a struct thermal_zone_device
81 * @failed_gov_name: the name of the governor that failed to register
82 *
83 * Register the previous governor of the thermal zone after a new
84 * governor has failed to be bound.
85 */
86static void bind_previous_governor(struct thermal_zone_device *tz,
87 const char *failed_gov_name)
88{
89 if (tz->governor && tz->governor->bind_to_tz) {
90 if (tz->governor->bind_to_tz(tz)) {
91 dev_err(&tz->device,
92 "governor %s failed to bind and the previous one (%s) failed to bind again, thermal zone %s has no governor\n",
93 failed_gov_name, tz->governor->name, tz->type);
94 tz->governor = NULL;
95 }
96 }
97}
98
99/**
100 * thermal_set_governor() - Switch to another governor
101 * @tz: a valid pointer to a struct thermal_zone_device
102 * @new_gov: pointer to the new governor
103 *
104 * Change the governor of thermal zone @tz.
105 *
106 * Return: 0 on success, an error if the new governor's bind_to_tz() failed.
107 */
108static int thermal_set_governor(struct thermal_zone_device *tz,
109 struct thermal_governor *new_gov)
110{
111 int ret = 0;
112
113 if (tz->governor && tz->governor->unbind_from_tz)
114 tz->governor->unbind_from_tz(tz);
115
116 if (new_gov && new_gov->bind_to_tz) {
117 ret = new_gov->bind_to_tz(tz);
118 if (ret) {
119 bind_previous_governor(tz, new_gov->name);
120
121 return ret;
122 }
123 }
124
125 tz->governor = new_gov;
126
127 return ret;
128}
129
Durgadoss Ra4a15482012-09-18 11:04:57 +0530130int thermal_register_governor(struct thermal_governor *governor)
131{
132 int err;
133 const char *name;
134 struct thermal_zone_device *pos;
135
136 if (!governor)
137 return -EINVAL;
138
139 mutex_lock(&thermal_governor_lock);
140
141 err = -EBUSY;
142 if (__find_governor(governor->name) == NULL) {
143 err = 0;
144 list_add(&governor->governor_list, &thermal_governor_list);
Zhang Ruif2234bc2014-01-24 10:23:19 +0800145 if (!def_governor && !strncmp(governor->name,
146 DEFAULT_THERMAL_GOVERNOR, THERMAL_NAME_LENGTH))
147 def_governor = governor;
Durgadoss Ra4a15482012-09-18 11:04:57 +0530148 }
149
150 mutex_lock(&thermal_list_lock);
151
152 list_for_each_entry(pos, &thermal_tz_list, node) {
Zhang Ruif2234bc2014-01-24 10:23:19 +0800153 /*
154 * only thermal zones with specified tz->tzp->governor_name
155 * may run with tz->govenor unset
156 */
Durgadoss Ra4a15482012-09-18 11:04:57 +0530157 if (pos->governor)
158 continue;
Zhang Ruif2234bc2014-01-24 10:23:19 +0800159
160 name = pos->tzp->governor_name;
161
Javi Merinoe33df1d2015-02-26 19:00:27 +0000162 if (!strncasecmp(name, governor->name, THERMAL_NAME_LENGTH)) {
163 int ret;
164
165 ret = thermal_set_governor(pos, governor);
166 if (ret)
167 dev_err(&pos->device,
168 "Failed to set governor %s for thermal zone %s: %d\n",
169 governor->name, pos->type, ret);
170 }
Durgadoss Ra4a15482012-09-18 11:04:57 +0530171 }
172
173 mutex_unlock(&thermal_list_lock);
174 mutex_unlock(&thermal_governor_lock);
175
176 return err;
177}
Durgadoss Ra4a15482012-09-18 11:04:57 +0530178
179void thermal_unregister_governor(struct thermal_governor *governor)
180{
181 struct thermal_zone_device *pos;
182
183 if (!governor)
184 return;
185
186 mutex_lock(&thermal_governor_lock);
187
188 if (__find_governor(governor->name) == NULL)
189 goto exit;
190
191 mutex_lock(&thermal_list_lock);
192
193 list_for_each_entry(pos, &thermal_tz_list, node) {
Rasmus Villemoes484ac2f2014-10-13 15:55:01 -0700194 if (!strncasecmp(pos->governor->name, governor->name,
Durgadoss Ra4a15482012-09-18 11:04:57 +0530195 THERMAL_NAME_LENGTH))
Javi Merinoe33df1d2015-02-26 19:00:27 +0000196 thermal_set_governor(pos, NULL);
Durgadoss Ra4a15482012-09-18 11:04:57 +0530197 }
198
199 mutex_unlock(&thermal_list_lock);
200 list_del(&governor->governor_list);
201exit:
202 mutex_unlock(&thermal_governor_lock);
203 return;
204}
Zhang Rui203d3d42008-01-17 15:51:08 +0800205
206static int get_idr(struct idr *idr, struct mutex *lock, int *id)
207{
Tejun Heo6deb69f2013-02-27 17:04:46 -0800208 int ret;
Zhang Rui203d3d42008-01-17 15:51:08 +0800209
210 if (lock)
211 mutex_lock(lock);
Tejun Heo6deb69f2013-02-27 17:04:46 -0800212 ret = idr_alloc(idr, NULL, 0, 0, GFP_KERNEL);
Zhang Rui203d3d42008-01-17 15:51:08 +0800213 if (lock)
214 mutex_unlock(lock);
Tejun Heo6deb69f2013-02-27 17:04:46 -0800215 if (unlikely(ret < 0))
216 return ret;
217 *id = ret;
Zhang Rui203d3d42008-01-17 15:51:08 +0800218 return 0;
219}
220
221static void release_idr(struct idr *idr, struct mutex *lock, int id)
222{
223 if (lock)
224 mutex_lock(lock);
225 idr_remove(idr, id);
226 if (lock)
227 mutex_unlock(lock);
228}
229
Durgadoss R9b4298a2012-09-18 11:04:54 +0530230int get_tz_trend(struct thermal_zone_device *tz, int trip)
231{
232 enum thermal_trend trend;
233
Eduardo Valentin0c872502013-05-29 21:37:00 +0000234 if (tz->emul_temperature || !tz->ops->get_trend ||
235 tz->ops->get_trend(tz, trip, &trend)) {
Durgadoss R9b4298a2012-09-18 11:04:54 +0530236 if (tz->temperature > tz->last_temperature)
237 trend = THERMAL_TREND_RAISING;
238 else if (tz->temperature < tz->last_temperature)
239 trend = THERMAL_TREND_DROPPING;
240 else
241 trend = THERMAL_TREND_STABLE;
242 }
243
244 return trend;
245}
246EXPORT_SYMBOL(get_tz_trend);
247
248struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
249 struct thermal_cooling_device *cdev, int trip)
250{
251 struct thermal_instance *pos = NULL;
252 struct thermal_instance *target_instance = NULL;
253
254 mutex_lock(&tz->lock);
255 mutex_lock(&cdev->lock);
256
257 list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
258 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
259 target_instance = pos;
260 break;
261 }
262 }
263
264 mutex_unlock(&cdev->lock);
265 mutex_unlock(&tz->lock);
266
267 return target_instance;
268}
269EXPORT_SYMBOL(get_thermal_instance);
270
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530271static void print_bind_err_msg(struct thermal_zone_device *tz,
272 struct thermal_cooling_device *cdev, int ret)
273{
274 dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
275 tz->type, cdev->type, ret);
276}
277
278static void __bind(struct thermal_zone_device *tz, int mask,
Eduardo Valentina8892d832013-07-16 15:26:28 -0400279 struct thermal_cooling_device *cdev,
Kapileshwar Singh6cd9e9f2015-02-18 16:04:21 +0000280 unsigned long *limits,
281 unsigned int weight)
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530282{
283 int i, ret;
284
285 for (i = 0; i < tz->trips; i++) {
286 if (mask & (1 << i)) {
Eduardo Valentina8892d832013-07-16 15:26:28 -0400287 unsigned long upper, lower;
288
289 upper = THERMAL_NO_LIMIT;
290 lower = THERMAL_NO_LIMIT;
291 if (limits) {
292 lower = limits[i * 2];
293 upper = limits[i * 2 + 1];
294 }
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530295 ret = thermal_zone_bind_cooling_device(tz, i, cdev,
Kapileshwar Singh6cd9e9f2015-02-18 16:04:21 +0000296 upper, lower,
297 weight);
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530298 if (ret)
299 print_bind_err_msg(tz, cdev, ret);
300 }
301 }
302}
303
304static void __unbind(struct thermal_zone_device *tz, int mask,
305 struct thermal_cooling_device *cdev)
306{
307 int i;
308
309 for (i = 0; i < tz->trips; i++)
310 if (mask & (1 << i))
311 thermal_zone_unbind_cooling_device(tz, i, cdev);
312}
313
314static void bind_cdev(struct thermal_cooling_device *cdev)
315{
316 int i, ret;
317 const struct thermal_zone_params *tzp;
318 struct thermal_zone_device *pos = NULL;
319
320 mutex_lock(&thermal_list_lock);
321
322 list_for_each_entry(pos, &thermal_tz_list, node) {
323 if (!pos->tzp && !pos->ops->bind)
324 continue;
325
Ni Wadea9f2d192013-11-06 14:30:13 +0800326 if (pos->ops->bind) {
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530327 ret = pos->ops->bind(pos, cdev);
328 if (ret)
329 print_bind_err_msg(pos, cdev, ret);
Ni Wadea9f2d192013-11-06 14:30:13 +0800330 continue;
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530331 }
332
333 tzp = pos->tzp;
Hugh Dickins791700c2012-09-27 16:48:28 -0700334 if (!tzp || !tzp->tbp)
335 continue;
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530336
337 for (i = 0; i < tzp->num_tbps; i++) {
338 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
339 continue;
340 if (tzp->tbp[i].match(pos, cdev))
341 continue;
342 tzp->tbp[i].cdev = cdev;
Eduardo Valentina8892d832013-07-16 15:26:28 -0400343 __bind(pos, tzp->tbp[i].trip_mask, cdev,
Kapileshwar Singh6cd9e9f2015-02-18 16:04:21 +0000344 tzp->tbp[i].binding_limits,
345 tzp->tbp[i].weight);
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530346 }
347 }
348
349 mutex_unlock(&thermal_list_lock);
350}
351
352static void bind_tz(struct thermal_zone_device *tz)
353{
354 int i, ret;
355 struct thermal_cooling_device *pos = NULL;
356 const struct thermal_zone_params *tzp = tz->tzp;
357
358 if (!tzp && !tz->ops->bind)
359 return;
360
361 mutex_lock(&thermal_list_lock);
362
Ni Wadea9f2d192013-11-06 14:30:13 +0800363 /* If there is ops->bind, try to use ops->bind */
364 if (tz->ops->bind) {
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530365 list_for_each_entry(pos, &thermal_cdev_list, node) {
366 ret = tz->ops->bind(tz, pos);
367 if (ret)
368 print_bind_err_msg(tz, pos, ret);
369 }
370 goto exit;
371 }
372
Hugh Dickins791700c2012-09-27 16:48:28 -0700373 if (!tzp || !tzp->tbp)
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530374 goto exit;
375
376 list_for_each_entry(pos, &thermal_cdev_list, node) {
377 for (i = 0; i < tzp->num_tbps; i++) {
378 if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
379 continue;
380 if (tzp->tbp[i].match(tz, pos))
381 continue;
382 tzp->tbp[i].cdev = pos;
Eduardo Valentina8892d832013-07-16 15:26:28 -0400383 __bind(tz, tzp->tbp[i].trip_mask, pos,
Kapileshwar Singh6cd9e9f2015-02-18 16:04:21 +0000384 tzp->tbp[i].binding_limits,
385 tzp->tbp[i].weight);
Durgadoss R7e8ee1e2012-09-18 11:04:59 +0530386 }
387 }
388exit:
389 mutex_unlock(&thermal_list_lock);
390}
391
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530392static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
393 int delay)
394{
395 if (delay > 1000)
396 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
397 round_jiffies(msecs_to_jiffies(delay)));
398 else if (delay)
399 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
400 msecs_to_jiffies(delay));
401 else
402 cancel_delayed_work(&tz->poll_queue);
403}
404
405static void monitor_thermal_zone(struct thermal_zone_device *tz)
406{
407 mutex_lock(&tz->lock);
408
409 if (tz->passive)
410 thermal_zone_device_set_polling(tz, tz->passive_delay);
411 else if (tz->polling_delay)
412 thermal_zone_device_set_polling(tz, tz->polling_delay);
413 else
414 thermal_zone_device_set_polling(tz, 0);
415
416 mutex_unlock(&tz->lock);
417}
418
419static void handle_non_critical_trips(struct thermal_zone_device *tz,
420 int trip, enum thermal_trip_type trip_type)
421{
Zhang Ruif2234bc2014-01-24 10:23:19 +0800422 tz->governor ? tz->governor->throttle(tz, trip) :
423 def_governor->throttle(tz, trip);
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530424}
425
426static void handle_critical_trips(struct thermal_zone_device *tz,
427 int trip, enum thermal_trip_type trip_type)
428{
Sascha Hauer17e83512015-07-24 08:12:54 +0200429 int trip_temp;
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530430
431 tz->ops->get_trip_temp(tz, trip, &trip_temp);
432
433 /* If we have not crossed the trip_temp, we do not care. */
Srinivas Pandruvada84ffe3e2014-11-12 15:43:29 -0800434 if (trip_temp <= 0 || tz->temperature < trip_temp)
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530435 return;
436
Punit Agrawal208cd822014-07-29 11:50:50 +0100437 trace_thermal_zone_trip(tz, trip, trip_type);
438
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530439 if (tz->ops->notify)
440 tz->ops->notify(tz, trip, trip_type);
441
442 if (trip_type == THERMAL_TRIP_CRITICAL) {
Eduardo Valentin923e0b12013-01-02 15:29:41 +0000443 dev_emerg(&tz->device,
444 "critical temperature reached(%d C),shutting down\n",
445 tz->temperature / 1000);
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530446 orderly_poweroff(true);
447 }
448}
449
450static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
451{
452 enum thermal_trip_type type;
453
454 tz->ops->get_trip_type(tz, trip, &type);
455
456 if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
457 handle_critical_trips(tz, trip, type);
458 else
459 handle_non_critical_trips(tz, trip, type);
460 /*
461 * Alright, we handled this trip successfully.
462 * So, start monitoring again.
463 */
464 monitor_thermal_zone(tz);
465}
466
Eduardo Valentin837b26b2013-04-05 12:32:29 +0000467/**
Sascha Hauerf6be0582015-07-06 09:46:14 +0200468 * thermal_zone_get_temp() - returns the temperature of a thermal zone
Eduardo Valentin837b26b2013-04-05 12:32:29 +0000469 * @tz: a valid pointer to a struct thermal_zone_device
470 * @temp: a valid pointer to where to store the resulting temperature.
471 *
472 * When a valid thermal zone reference is passed, it will fetch its
473 * temperature and fill @temp.
474 *
475 * Return: On success returns 0, an error code otherwise
476 */
Sascha Hauer17e83512015-07-24 08:12:54 +0200477int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp)
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000478{
Eduardo Valentin837b26b2013-04-05 12:32:29 +0000479 int ret = -EINVAL;
Zhang Rui5e20b2e2013-02-06 14:02:12 +0800480 int count;
Sascha Hauer17e83512015-07-24 08:12:54 +0200481 int crit_temp = INT_MAX;
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000482 enum thermal_trip_type type;
483
Eduardo Valentin81bd4e12013-09-12 19:15:44 -0400484 if (!tz || IS_ERR(tz) || !tz->ops->get_temp)
Eduardo Valentin837b26b2013-04-05 12:32:29 +0000485 goto exit;
486
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000487 mutex_lock(&tz->lock);
488
489 ret = tz->ops->get_temp(tz, temp);
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000490
Sascha Hauer79e54212015-07-06 09:46:16 +0200491 if (IS_ENABLED(CONFIG_THERMAL_EMULATION) && tz->emul_temperature) {
492 for (count = 0; count < tz->trips; count++) {
493 ret = tz->ops->get_trip_type(tz, count, &type);
494 if (!ret && type == THERMAL_TRIP_CRITICAL) {
495 ret = tz->ops->get_trip_temp(tz, count,
496 &crit_temp);
497 break;
498 }
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000499 }
Sascha Hauer79e54212015-07-06 09:46:16 +0200500
Sascha Hauer934c93b2015-07-06 09:46:17 +0200501 /*
502 * Only allow emulating a temperature when the real temperature
503 * is below the critical temperature so that the emulation code
504 * cannot hide critical conditions.
505 */
Sascha Hauer79e54212015-07-06 09:46:16 +0200506 if (!ret && *temp < crit_temp)
507 *temp = tz->emul_temperature;
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000508 }
Sascha Hauer79e54212015-07-06 09:46:16 +0200509
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000510 mutex_unlock(&tz->lock);
Eduardo Valentin837b26b2013-04-05 12:32:29 +0000511exit:
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000512 return ret;
513}
Eduardo Valentin837b26b2013-04-05 12:32:29 +0000514EXPORT_SYMBOL_GPL(thermal_zone_get_temp);
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000515
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530516static void update_temperature(struct thermal_zone_device *tz)
517{
Sascha Hauer17e83512015-07-24 08:12:54 +0200518 int temp, ret;
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530519
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000520 ret = thermal_zone_get_temp(tz, &temp);
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530521 if (ret) {
Hans de Goede7e497a72015-03-21 15:02:55 +0100522 if (ret != -EAGAIN)
523 dev_warn(&tz->device,
524 "failed to read out thermal zone (%d)\n",
525 ret);
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000526 return;
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530527 }
528
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000529 mutex_lock(&tz->lock);
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530530 tz->last_temperature = tz->temperature;
531 tz->temperature = temp;
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530532 mutex_unlock(&tz->lock);
Aaron Lu06475b52013-12-02 13:54:26 +0800533
Punit Agrawal100a8fd2014-07-29 11:50:48 +0100534 trace_thermal_temperature(tz);
Aaron Lu06475b52013-12-02 13:54:26 +0800535 dev_dbg(&tz->device, "last_temperature=%d, current_temperature=%d\n",
536 tz->last_temperature, tz->temperature);
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530537}
538
539void thermal_zone_device_update(struct thermal_zone_device *tz)
540{
541 int count;
542
Eduardo Valentin81bd4e12013-09-12 19:15:44 -0400543 if (!tz->ops->get_temp)
544 return;
545
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530546 update_temperature(tz);
547
548 for (count = 0; count < tz->trips; count++)
549 handle_thermal_trip(tz, count);
550}
Eduardo Valentin910cb1e2013-04-23 21:48:15 +0000551EXPORT_SYMBOL_GPL(thermal_zone_device_update);
Durgadoss R0c01ebb2012-09-18 11:05:04 +0530552
553static void thermal_zone_device_check(struct work_struct *work)
554{
555 struct thermal_zone_device *tz = container_of(work, struct
556 thermal_zone_device,
557 poll_queue.work);
558 thermal_zone_device_update(tz);
559}
560
Zhang Rui203d3d42008-01-17 15:51:08 +0800561/* sys I/F for thermal zone */
562
563#define to_thermal_zone(_dev) \
564 container_of(_dev, struct thermal_zone_device, device)
565
566static ssize_t
567type_show(struct device *dev, struct device_attribute *attr, char *buf)
568{
569 struct thermal_zone_device *tz = to_thermal_zone(dev);
570
571 return sprintf(buf, "%s\n", tz->type);
572}
573
574static ssize_t
575temp_show(struct device *dev, struct device_attribute *attr, char *buf)
576{
577 struct thermal_zone_device *tz = to_thermal_zone(dev);
Sascha Hauer17e83512015-07-24 08:12:54 +0200578 int temperature, ret;
Zhang Rui203d3d42008-01-17 15:51:08 +0800579
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000580 ret = thermal_zone_get_temp(tz, &temperature);
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000581
582 if (ret)
583 return ret;
584
Sascha Hauer17e83512015-07-24 08:12:54 +0200585 return sprintf(buf, "%d\n", temperature);
Zhang Rui203d3d42008-01-17 15:51:08 +0800586}
587
588static ssize_t
589mode_show(struct device *dev, struct device_attribute *attr, char *buf)
590{
591 struct thermal_zone_device *tz = to_thermal_zone(dev);
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000592 enum thermal_device_mode mode;
593 int result;
Zhang Rui203d3d42008-01-17 15:51:08 +0800594
595 if (!tz->ops->get_mode)
596 return -EPERM;
597
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000598 result = tz->ops->get_mode(tz, &mode);
599 if (result)
600 return result;
601
602 return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
603 : "disabled");
Zhang Rui203d3d42008-01-17 15:51:08 +0800604}
605
606static ssize_t
607mode_store(struct device *dev, struct device_attribute *attr,
608 const char *buf, size_t count)
609{
610 struct thermal_zone_device *tz = to_thermal_zone(dev);
611 int result;
612
613 if (!tz->ops->set_mode)
614 return -EPERM;
615
Amit Daniel Kachhapf1f0e2a2012-03-21 16:40:01 +0530616 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000617 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
Amit Daniel Kachhapf1f0e2a2012-03-21 16:40:01 +0530618 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000619 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
620 else
621 result = -EINVAL;
622
Zhang Rui203d3d42008-01-17 15:51:08 +0800623 if (result)
624 return result;
625
626 return count;
627}
628
629static ssize_t
630trip_point_type_show(struct device *dev, struct device_attribute *attr,
631 char *buf)
632{
633 struct thermal_zone_device *tz = to_thermal_zone(dev);
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000634 enum thermal_trip_type type;
635 int trip, result;
Zhang Rui203d3d42008-01-17 15:51:08 +0800636
637 if (!tz->ops->get_trip_type)
638 return -EPERM;
639
640 if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
641 return -EINVAL;
642
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000643 result = tz->ops->get_trip_type(tz, trip, &type);
644 if (result)
645 return result;
646
647 switch (type) {
648 case THERMAL_TRIP_CRITICAL:
Amit Kucheria625120a42009-10-16 12:46:02 +0300649 return sprintf(buf, "critical\n");
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000650 case THERMAL_TRIP_HOT:
Amit Kucheria625120a42009-10-16 12:46:02 +0300651 return sprintf(buf, "hot\n");
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000652 case THERMAL_TRIP_PASSIVE:
Amit Kucheria625120a42009-10-16 12:46:02 +0300653 return sprintf(buf, "passive\n");
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000654 case THERMAL_TRIP_ACTIVE:
Amit Kucheria625120a42009-10-16 12:46:02 +0300655 return sprintf(buf, "active\n");
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000656 default:
Amit Kucheria625120a42009-10-16 12:46:02 +0300657 return sprintf(buf, "unknown\n");
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000658 }
Zhang Rui203d3d42008-01-17 15:51:08 +0800659}
660
661static ssize_t
Durgadoss Rc56f5c02012-07-25 10:10:58 +0800662trip_point_temp_store(struct device *dev, struct device_attribute *attr,
663 const char *buf, size_t count)
664{
665 struct thermal_zone_device *tz = to_thermal_zone(dev);
666 int trip, ret;
667 unsigned long temperature;
668
669 if (!tz->ops->set_trip_temp)
670 return -EPERM;
671
672 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
673 return -EINVAL;
674
675 if (kstrtoul(buf, 10, &temperature))
676 return -EINVAL;
677
678 ret = tz->ops->set_trip_temp(tz, trip, temperature);
679
680 return ret ? ret : count;
681}
682
683static ssize_t
Zhang Rui203d3d42008-01-17 15:51:08 +0800684trip_point_temp_show(struct device *dev, struct device_attribute *attr,
685 char *buf)
686{
687 struct thermal_zone_device *tz = to_thermal_zone(dev);
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000688 int trip, ret;
Sascha Hauer17e83512015-07-24 08:12:54 +0200689 int temperature;
Zhang Rui203d3d42008-01-17 15:51:08 +0800690
691 if (!tz->ops->get_trip_temp)
692 return -EPERM;
693
694 if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
695 return -EINVAL;
696
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000697 ret = tz->ops->get_trip_temp(tz, trip, &temperature);
698
699 if (ret)
700 return ret;
701
Sascha Hauer17e83512015-07-24 08:12:54 +0200702 return sprintf(buf, "%d\n", temperature);
Zhang Rui203d3d42008-01-17 15:51:08 +0800703}
704
Matthew Garrett03a971a2008-12-03 18:00:38 +0000705static ssize_t
Durgadoss R27365a62012-07-25 10:10:59 +0800706trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
707 const char *buf, size_t count)
708{
709 struct thermal_zone_device *tz = to_thermal_zone(dev);
710 int trip, ret;
Sascha Hauer17e83512015-07-24 08:12:54 +0200711 int temperature;
Durgadoss R27365a62012-07-25 10:10:59 +0800712
713 if (!tz->ops->set_trip_hyst)
714 return -EPERM;
715
716 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
717 return -EINVAL;
718
Sascha Hauer17e83512015-07-24 08:12:54 +0200719 if (kstrtoint(buf, 10, &temperature))
Durgadoss R27365a62012-07-25 10:10:59 +0800720 return -EINVAL;
721
722 /*
723 * We are not doing any check on the 'temperature' value
724 * here. The driver implementing 'set_trip_hyst' has to
725 * take care of this.
726 */
727 ret = tz->ops->set_trip_hyst(tz, trip, temperature);
728
729 return ret ? ret : count;
730}
731
732static ssize_t
733trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
734 char *buf)
735{
736 struct thermal_zone_device *tz = to_thermal_zone(dev);
737 int trip, ret;
Sascha Hauer17e83512015-07-24 08:12:54 +0200738 int temperature;
Durgadoss R27365a62012-07-25 10:10:59 +0800739
740 if (!tz->ops->get_trip_hyst)
741 return -EPERM;
742
743 if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
744 return -EINVAL;
745
746 ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
747
Sascha Hauer17e83512015-07-24 08:12:54 +0200748 return ret ? ret : sprintf(buf, "%d\n", temperature);
Durgadoss R27365a62012-07-25 10:10:59 +0800749}
750
751static ssize_t
Matthew Garrett03a971a2008-12-03 18:00:38 +0000752passive_store(struct device *dev, struct device_attribute *attr,
753 const char *buf, size_t count)
754{
755 struct thermal_zone_device *tz = to_thermal_zone(dev);
756 struct thermal_cooling_device *cdev = NULL;
757 int state;
758
759 if (!sscanf(buf, "%d\n", &state))
760 return -EINVAL;
761
Frans Pop3d8e3ad2009-10-26 08:39:02 +0100762 /* sanity check: values below 1000 millicelcius don't make sense
763 * and can cause the system to go into a thermal heart attack
764 */
765 if (state && state < 1000)
766 return -EINVAL;
767
Matthew Garrett03a971a2008-12-03 18:00:38 +0000768 if (state && !tz->forced_passive) {
769 mutex_lock(&thermal_list_lock);
770 list_for_each_entry(cdev, &thermal_cdev_list, node) {
771 if (!strncmp("Processor", cdev->type,
772 sizeof("Processor")))
773 thermal_zone_bind_cooling_device(tz,
Zhang Rui9d998422012-06-26 16:35:57 +0800774 THERMAL_TRIPS_NONE, cdev,
775 THERMAL_NO_LIMIT,
Kapileshwar Singh6cd9e9f2015-02-18 16:04:21 +0000776 THERMAL_NO_LIMIT,
777 THERMAL_WEIGHT_DEFAULT);
Matthew Garrett03a971a2008-12-03 18:00:38 +0000778 }
779 mutex_unlock(&thermal_list_lock);
Frans Pope4143b02009-10-26 08:39:03 +0100780 if (!tz->passive_delay)
781 tz->passive_delay = 1000;
Matthew Garrett03a971a2008-12-03 18:00:38 +0000782 } else if (!state && tz->forced_passive) {
783 mutex_lock(&thermal_list_lock);
784 list_for_each_entry(cdev, &thermal_cdev_list, node) {
785 if (!strncmp("Processor", cdev->type,
786 sizeof("Processor")))
787 thermal_zone_unbind_cooling_device(tz,
788 THERMAL_TRIPS_NONE,
789 cdev);
790 }
791 mutex_unlock(&thermal_list_lock);
Frans Pope4143b02009-10-26 08:39:03 +0100792 tz->passive_delay = 0;
Matthew Garrett03a971a2008-12-03 18:00:38 +0000793 }
794
Matthew Garrett03a971a2008-12-03 18:00:38 +0000795 tz->forced_passive = state;
796
797 thermal_zone_device_update(tz);
798
799 return count;
800}
801
802static ssize_t
803passive_show(struct device *dev, struct device_attribute *attr,
804 char *buf)
805{
806 struct thermal_zone_device *tz = to_thermal_zone(dev);
807
808 return sprintf(buf, "%d\n", tz->forced_passive);
809}
810
Durgadoss R5a2c0902012-09-18 11:04:58 +0530811static ssize_t
812policy_store(struct device *dev, struct device_attribute *attr,
813 const char *buf, size_t count)
814{
815 int ret = -EINVAL;
816 struct thermal_zone_device *tz = to_thermal_zone(dev);
817 struct thermal_governor *gov;
Andy Shevchenko42a5bf52013-05-17 11:52:02 +0000818 char name[THERMAL_NAME_LENGTH];
819
820 snprintf(name, sizeof(name), "%s", buf);
Durgadoss R5a2c0902012-09-18 11:04:58 +0530821
822 mutex_lock(&thermal_governor_lock);
Javi Merinob6cc7722014-11-25 16:00:33 +0000823 mutex_lock(&tz->lock);
Durgadoss R5a2c0902012-09-18 11:04:58 +0530824
Andy Shevchenko42a5bf52013-05-17 11:52:02 +0000825 gov = __find_governor(strim(name));
Durgadoss R5a2c0902012-09-18 11:04:58 +0530826 if (!gov)
827 goto exit;
828
Javi Merinoe33df1d2015-02-26 19:00:27 +0000829 ret = thermal_set_governor(tz, gov);
830 if (!ret)
831 ret = count;
Durgadoss R5a2c0902012-09-18 11:04:58 +0530832
833exit:
Javi Merinob6cc7722014-11-25 16:00:33 +0000834 mutex_unlock(&tz->lock);
Durgadoss R5a2c0902012-09-18 11:04:58 +0530835 mutex_unlock(&thermal_governor_lock);
836 return ret;
837}
838
839static ssize_t
840policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
841{
842 struct thermal_zone_device *tz = to_thermal_zone(dev);
843
844 return sprintf(buf, "%s\n", tz->governor->name);
845}
846
Ni Wade25a0a5c2015-07-14 15:40:56 +0800847static ssize_t
848available_policies_show(struct device *dev, struct device_attribute *devattr,
849 char *buf)
850{
851 struct thermal_governor *pos;
852 ssize_t count = 0;
853 ssize_t size = PAGE_SIZE;
854
855 mutex_lock(&thermal_governor_lock);
856
857 list_for_each_entry(pos, &thermal_governor_list, governor_list) {
858 size = PAGE_SIZE - count;
859 count += scnprintf(buf + count, size, "%s ", pos->name);
860 }
861 count += scnprintf(buf + count, size, "\n");
862
863 mutex_unlock(&thermal_governor_lock);
864
865 return count;
866}
867
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000868static ssize_t
869emul_temp_store(struct device *dev, struct device_attribute *attr,
870 const char *buf, size_t count)
871{
872 struct thermal_zone_device *tz = to_thermal_zone(dev);
873 int ret = 0;
874 unsigned long temperature;
875
876 if (kstrtoul(buf, 10, &temperature))
877 return -EINVAL;
878
879 if (!tz->ops->set_emul_temp) {
880 mutex_lock(&tz->lock);
881 tz->emul_temperature = temperature;
882 mutex_unlock(&tz->lock);
883 } else {
884 ret = tz->ops->set_emul_temp(tz, temperature);
885 }
886
lan,Tianyu800744b2014-01-02 15:47:54 +0800887 if (!ret)
888 thermal_zone_device_update(tz);
889
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000890 return ret ? ret : count;
891}
892static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
Amit Daniel Kachhape6e238c2013-02-04 00:30:15 +0000893
Javi Merino9f382712015-03-26 15:53:02 +0000894static ssize_t
895sustainable_power_show(struct device *dev, struct device_attribute *devattr,
896 char *buf)
897{
898 struct thermal_zone_device *tz = to_thermal_zone(dev);
899
900 if (tz->tzp)
901 return sprintf(buf, "%u\n", tz->tzp->sustainable_power);
902 else
903 return -EIO;
904}
905
906static ssize_t
907sustainable_power_store(struct device *dev, struct device_attribute *devattr,
908 const char *buf, size_t count)
909{
910 struct thermal_zone_device *tz = to_thermal_zone(dev);
911 u32 sustainable_power;
912
913 if (!tz->tzp)
914 return -EIO;
915
916 if (kstrtou32(buf, 10, &sustainable_power))
917 return -EINVAL;
918
919 tz->tzp->sustainable_power = sustainable_power;
920
921 return count;
922}
923static DEVICE_ATTR(sustainable_power, S_IWUSR | S_IRUGO, sustainable_power_show,
924 sustainable_power_store);
925
926#define create_s32_tzp_attr(name) \
927 static ssize_t \
928 name##_show(struct device *dev, struct device_attribute *devattr, \
929 char *buf) \
930 { \
931 struct thermal_zone_device *tz = to_thermal_zone(dev); \
932 \
933 if (tz->tzp) \
934 return sprintf(buf, "%u\n", tz->tzp->name); \
935 else \
936 return -EIO; \
937 } \
938 \
939 static ssize_t \
940 name##_store(struct device *dev, struct device_attribute *devattr, \
941 const char *buf, size_t count) \
942 { \
943 struct thermal_zone_device *tz = to_thermal_zone(dev); \
944 s32 value; \
945 \
946 if (!tz->tzp) \
947 return -EIO; \
948 \
949 if (kstrtos32(buf, 10, &value)) \
950 return -EINVAL; \
951 \
952 tz->tzp->name = value; \
953 \
954 return count; \
955 } \
956 static DEVICE_ATTR(name, S_IWUSR | S_IRUGO, name##_show, name##_store)
957
958create_s32_tzp_attr(k_po);
959create_s32_tzp_attr(k_pu);
960create_s32_tzp_attr(k_i);
961create_s32_tzp_attr(k_d);
962create_s32_tzp_attr(integral_cutoff);
Eduardo Valentin9d0be7f2015-05-11 19:34:23 -0700963create_s32_tzp_attr(slope);
964create_s32_tzp_attr(offset);
Javi Merino9f382712015-03-26 15:53:02 +0000965#undef create_s32_tzp_attr
966
967static struct device_attribute *dev_tzp_attrs[] = {
968 &dev_attr_sustainable_power,
969 &dev_attr_k_po,
970 &dev_attr_k_pu,
971 &dev_attr_k_i,
972 &dev_attr_k_d,
973 &dev_attr_integral_cutoff,
Eduardo Valentin9d0be7f2015-05-11 19:34:23 -0700974 &dev_attr_slope,
975 &dev_attr_offset,
Javi Merino9f382712015-03-26 15:53:02 +0000976};
977
978static int create_tzp_attrs(struct device *dev)
979{
980 int i;
981
982 for (i = 0; i < ARRAY_SIZE(dev_tzp_attrs); i++) {
983 int ret;
984 struct device_attribute *dev_attr = dev_tzp_attrs[i];
985
986 ret = device_create_file(dev, dev_attr);
987 if (ret)
988 return ret;
989 }
990
991 return 0;
992}
993
Javi Merino35b11d22015-02-26 19:00:28 +0000994/**
995 * power_actor_get_max_power() - get the maximum power that a cdev can consume
996 * @cdev: pointer to &thermal_cooling_device
997 * @tz: a valid thermal zone device pointer
998 * @max_power: pointer in which to store the maximum power
999 *
1000 * Calculate the maximum power consumption in milliwats that the
1001 * cooling device can currently consume and store it in @max_power.
1002 *
1003 * Return: 0 on success, -EINVAL if @cdev doesn't support the
1004 * power_actor API or -E* on other error.
1005 */
1006int power_actor_get_max_power(struct thermal_cooling_device *cdev,
1007 struct thermal_zone_device *tz, u32 *max_power)
1008{
1009 if (!cdev_is_power_actor(cdev))
1010 return -EINVAL;
1011
1012 return cdev->ops->state2power(cdev, tz, 0, max_power);
1013}
1014
1015/**
1016 * power_actor_set_power() - limit the maximum power that a cooling device can consume
1017 * @cdev: pointer to &thermal_cooling_device
1018 * @instance: thermal instance to update
1019 * @power: the power in milliwatts
1020 *
1021 * Set the cooling device to consume at most @power milliwatts.
1022 *
1023 * Return: 0 on success, -EINVAL if the cooling device does not
1024 * implement the power actor API or -E* for other failures.
1025 */
1026int power_actor_set_power(struct thermal_cooling_device *cdev,
1027 struct thermal_instance *instance, u32 power)
1028{
1029 unsigned long state;
1030 int ret;
1031
1032 if (!cdev_is_power_actor(cdev))
1033 return -EINVAL;
1034
1035 ret = cdev->ops->power2state(cdev, instance->tz, power, &state);
1036 if (ret)
1037 return ret;
1038
1039 instance->target = state;
1040 cdev->updated = false;
1041 thermal_cdev_update(cdev);
1042
1043 return 0;
1044}
1045
Zhang Rui203d3d42008-01-17 15:51:08 +08001046static DEVICE_ATTR(type, 0444, type_show, NULL);
1047static DEVICE_ATTR(temp, 0444, temp_show, NULL);
1048static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
Joe Perches886ee542012-03-21 12:55:01 -07001049static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
Durgadoss R5a2c0902012-09-18 11:04:58 +05301050static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
Ni Wade25a0a5c2015-07-14 15:40:56 +08001051static DEVICE_ATTR(available_policies, S_IRUGO, available_policies_show, NULL);
Zhang Rui203d3d42008-01-17 15:51:08 +08001052
Zhang Rui203d3d42008-01-17 15:51:08 +08001053/* sys I/F for cooling device */
1054#define to_cooling_device(_dev) \
1055 container_of(_dev, struct thermal_cooling_device, device)
1056
1057static ssize_t
1058thermal_cooling_device_type_show(struct device *dev,
1059 struct device_attribute *attr, char *buf)
1060{
1061 struct thermal_cooling_device *cdev = to_cooling_device(dev);
1062
1063 return sprintf(buf, "%s\n", cdev->type);
1064}
1065
1066static ssize_t
1067thermal_cooling_device_max_state_show(struct device *dev,
1068 struct device_attribute *attr, char *buf)
1069{
1070 struct thermal_cooling_device *cdev = to_cooling_device(dev);
Matthew Garrett6503e5d2008-11-27 17:48:13 +00001071 unsigned long state;
1072 int ret;
Zhang Rui203d3d42008-01-17 15:51:08 +08001073
Matthew Garrett6503e5d2008-11-27 17:48:13 +00001074 ret = cdev->ops->get_max_state(cdev, &state);
1075 if (ret)
1076 return ret;
1077 return sprintf(buf, "%ld\n", state);
Zhang Rui203d3d42008-01-17 15:51:08 +08001078}
1079
1080static ssize_t
1081thermal_cooling_device_cur_state_show(struct device *dev,
1082 struct device_attribute *attr, char *buf)
1083{
1084 struct thermal_cooling_device *cdev = to_cooling_device(dev);
Matthew Garrett6503e5d2008-11-27 17:48:13 +00001085 unsigned long state;
1086 int ret;
Zhang Rui203d3d42008-01-17 15:51:08 +08001087
Matthew Garrett6503e5d2008-11-27 17:48:13 +00001088 ret = cdev->ops->get_cur_state(cdev, &state);
1089 if (ret)
1090 return ret;
1091 return sprintf(buf, "%ld\n", state);
Zhang Rui203d3d42008-01-17 15:51:08 +08001092}
1093
1094static ssize_t
1095thermal_cooling_device_cur_state_store(struct device *dev,
1096 struct device_attribute *attr,
1097 const char *buf, size_t count)
1098{
1099 struct thermal_cooling_device *cdev = to_cooling_device(dev);
Matthew Garrett6503e5d2008-11-27 17:48:13 +00001100 unsigned long state;
Zhang Rui203d3d42008-01-17 15:51:08 +08001101 int result;
1102
Matthew Garrett6503e5d2008-11-27 17:48:13 +00001103 if (!sscanf(buf, "%ld\n", &state))
Zhang Rui203d3d42008-01-17 15:51:08 +08001104 return -EINVAL;
1105
Roel Kluinedb94912009-12-15 22:46:50 +01001106 if ((long)state < 0)
Zhang Rui203d3d42008-01-17 15:51:08 +08001107 return -EINVAL;
1108
1109 result = cdev->ops->set_cur_state(cdev, state);
1110 if (result)
1111 return result;
1112 return count;
1113}
1114
1115static struct device_attribute dev_attr_cdev_type =
Len Brown543a9562008-02-07 16:55:08 -05001116__ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
Zhang Rui203d3d42008-01-17 15:51:08 +08001117static DEVICE_ATTR(max_state, 0444,
1118 thermal_cooling_device_max_state_show, NULL);
1119static DEVICE_ATTR(cur_state, 0644,
1120 thermal_cooling_device_cur_state_show,
1121 thermal_cooling_device_cur_state_store);
1122
1123static ssize_t
1124thermal_cooling_device_trip_point_show(struct device *dev,
Len Brown543a9562008-02-07 16:55:08 -05001125 struct device_attribute *attr, char *buf)
Zhang Rui203d3d42008-01-17 15:51:08 +08001126{
Zhang Ruib81b6ba2012-06-27 10:08:19 +08001127 struct thermal_instance *instance;
Zhang Rui203d3d42008-01-17 15:51:08 +08001128
1129 instance =
Zhang Ruib81b6ba2012-06-27 10:08:19 +08001130 container_of(attr, struct thermal_instance, attr);
Zhang Rui203d3d42008-01-17 15:51:08 +08001131
1132 if (instance->trip == THERMAL_TRIPS_NONE)
1133 return sprintf(buf, "-1\n");
1134 else
1135 return sprintf(buf, "%d\n", instance->trip);
1136}
1137
Matthias Kaehlcke2dc10f82015-02-20 18:10:08 -08001138static struct attribute *cooling_device_attrs[] = {
1139 &dev_attr_cdev_type.attr,
1140 &dev_attr_max_state.attr,
1141 &dev_attr_cur_state.attr,
1142 NULL,
1143};
1144
1145static const struct attribute_group cooling_device_attr_group = {
1146 .attrs = cooling_device_attrs,
1147};
1148
1149static const struct attribute_group *cooling_device_attr_groups[] = {
1150 &cooling_device_attr_group,
1151 NULL,
1152};
1153
Javi Merinodb916512015-02-18 16:04:24 +00001154static ssize_t
1155thermal_cooling_device_weight_show(struct device *dev,
1156 struct device_attribute *attr, char *buf)
1157{
1158 struct thermal_instance *instance;
1159
1160 instance = container_of(attr, struct thermal_instance, weight_attr);
1161
1162 return sprintf(buf, "%d\n", instance->weight);
1163}
1164
1165static ssize_t
1166thermal_cooling_device_weight_store(struct device *dev,
1167 struct device_attribute *attr,
1168 const char *buf, size_t count)
1169{
1170 struct thermal_instance *instance;
1171 int ret, weight;
1172
1173 ret = kstrtoint(buf, 0, &weight);
1174 if (ret)
1175 return ret;
1176
1177 instance = container_of(attr, struct thermal_instance, weight_attr);
1178 instance->weight = weight;
1179
1180 return count;
1181}
Zhang Rui203d3d42008-01-17 15:51:08 +08001182/* Device management */
1183
1184/**
Eduardo Valentind2e4eb82013-04-23 21:48:16 +00001185 * thermal_zone_bind_cooling_device() - bind a cooling device to a thermal zone
1186 * @tz: pointer to struct thermal_zone_device
Zhang Rui203d3d42008-01-17 15:51:08 +08001187 * @trip: indicates which trip point the cooling devices is
1188 * associated with in this thermal zone.
Eduardo Valentind2e4eb82013-04-23 21:48:16 +00001189 * @cdev: pointer to struct thermal_cooling_device
1190 * @upper: the Maximum cooling state for this trip point.
1191 * THERMAL_NO_LIMIT means no upper limit,
1192 * and the cooling device can be in max_state.
1193 * @lower: the Minimum cooling state can be used for this trip point.
1194 * THERMAL_NO_LIMIT means no lower limit,
1195 * and the cooling device can be in cooling state 0.
Kapileshwar Singh6cd9e9f2015-02-18 16:04:21 +00001196 * @weight: The weight of the cooling device to be bound to the
1197 * thermal zone. Use THERMAL_WEIGHT_DEFAULT for the
1198 * default value
Len Brown543a9562008-02-07 16:55:08 -05001199 *
Eduardo Valentind2e4eb82013-04-23 21:48:16 +00001200 * This interface function bind a thermal cooling device to the certain trip
1201 * point of a thermal zone device.
Len Brown543a9562008-02-07 16:55:08 -05001202 * This function is usually called in the thermal zone device .bind callback.
Eduardo Valentind2e4eb82013-04-23 21:48:16 +00001203 *
1204 * Return: 0 on success, the proper error value otherwise.
Zhang Rui203d3d42008-01-17 15:51:08 +08001205 */
1206int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1207 int trip,
Zhang Rui9d998422012-06-26 16:35:57 +08001208 struct thermal_cooling_device *cdev,
Kapileshwar Singh6cd9e9f2015-02-18 16:04:21 +00001209 unsigned long upper, unsigned long lower,
1210 unsigned int weight)
Zhang Rui203d3d42008-01-17 15:51:08 +08001211{
Zhang Ruib81b6ba2012-06-27 10:08:19 +08001212 struct thermal_instance *dev;
1213 struct thermal_instance *pos;
Thomas Sujithc7516702008-02-15 00:58:50 -05001214 struct thermal_zone_device *pos1;
1215 struct thermal_cooling_device *pos2;
Zhang Rui74051ba2012-06-26 16:27:22 +08001216 unsigned long max_state;
Lukasz Majewski9a3031d2014-11-18 11:16:30 +01001217 int result, ret;
Zhang Rui203d3d42008-01-17 15:51:08 +08001218
Len Brown543a9562008-02-07 16:55:08 -05001219 if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
Zhang Rui203d3d42008-01-17 15:51:08 +08001220 return -EINVAL;
1221
Thomas Sujithc7516702008-02-15 00:58:50 -05001222 list_for_each_entry(pos1, &thermal_tz_list, node) {
1223 if (pos1 == tz)
1224 break;
1225 }
1226 list_for_each_entry(pos2, &thermal_cdev_list, node) {
1227 if (pos2 == cdev)
1228 break;
1229 }
1230
1231 if (tz != pos1 || cdev != pos2)
Zhang Rui203d3d42008-01-17 15:51:08 +08001232 return -EINVAL;
1233
Lukasz Majewski9a3031d2014-11-18 11:16:30 +01001234 ret = cdev->ops->get_max_state(cdev, &max_state);
1235 if (ret)
1236 return ret;
Zhang Rui9d998422012-06-26 16:35:57 +08001237
1238 /* lower default 0, upper default max_state */
1239 lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1240 upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1241
1242 if (lower > upper || upper > max_state)
1243 return -EINVAL;
1244
Zhang Rui203d3d42008-01-17 15:51:08 +08001245 dev =
Zhang Ruib81b6ba2012-06-27 10:08:19 +08001246 kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
Zhang Rui203d3d42008-01-17 15:51:08 +08001247 if (!dev)
1248 return -ENOMEM;
1249 dev->tz = tz;
1250 dev->cdev = cdev;
1251 dev->trip = trip;
Zhang Rui9d998422012-06-26 16:35:57 +08001252 dev->upper = upper;
1253 dev->lower = lower;
Zhang Ruice119f82012-06-27 14:13:04 +08001254 dev->target = THERMAL_NO_TARGET;
Kapileshwar Singh6cd9e9f2015-02-18 16:04:21 +00001255 dev->weight = weight;
Zhang Rui74051ba2012-06-26 16:27:22 +08001256
Zhang Rui203d3d42008-01-17 15:51:08 +08001257 result = get_idr(&tz->idr, &tz->lock, &dev->id);
1258 if (result)
1259 goto free_mem;
1260
1261 sprintf(dev->name, "cdev%d", dev->id);
1262 result =
1263 sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1264 if (result)
1265 goto release_idr;
1266
1267 sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
Sergey Senozhatsky975f8c52010-04-06 14:34:51 -07001268 sysfs_attr_init(&dev->attr.attr);
Zhang Rui203d3d42008-01-17 15:51:08 +08001269 dev->attr.attr.name = dev->attr_name;
1270 dev->attr.attr.mode = 0444;
1271 dev->attr.show = thermal_cooling_device_trip_point_show;
1272 result = device_create_file(&tz->device, &dev->attr);
1273 if (result)
1274 goto remove_symbol_link;
1275
Javi Merinodb916512015-02-18 16:04:24 +00001276 sprintf(dev->weight_attr_name, "cdev%d_weight", dev->id);
1277 sysfs_attr_init(&dev->weight_attr.attr);
1278 dev->weight_attr.attr.name = dev->weight_attr_name;
1279 dev->weight_attr.attr.mode = S_IWUSR | S_IRUGO;
1280 dev->weight_attr.show = thermal_cooling_device_weight_show;
1281 dev->weight_attr.store = thermal_cooling_device_weight_store;
1282 result = device_create_file(&tz->device, &dev->weight_attr);
1283 if (result)
1284 goto remove_trip_file;
1285
Zhang Rui203d3d42008-01-17 15:51:08 +08001286 mutex_lock(&tz->lock);
Zhang Ruif4a821c2012-07-24 16:56:21 +08001287 mutex_lock(&cdev->lock);
Zhang Ruicddf31b2012-06-27 10:09:36 +08001288 list_for_each_entry(pos, &tz->thermal_instances, tz_node)
Zhang Rui203d3d42008-01-17 15:51:08 +08001289 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1290 result = -EEXIST;
1291 break;
1292 }
Zhang Ruib5e4ae62012-06-27 14:11:52 +08001293 if (!result) {
Zhang Ruicddf31b2012-06-27 10:09:36 +08001294 list_add_tail(&dev->tz_node, &tz->thermal_instances);
Zhang Ruib5e4ae62012-06-27 14:11:52 +08001295 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1296 }
Zhang Ruif4a821c2012-07-24 16:56:21 +08001297 mutex_unlock(&cdev->lock);
Zhang Rui203d3d42008-01-17 15:51:08 +08001298 mutex_unlock(&tz->lock);
1299
1300 if (!result)
1301 return 0;
1302
Javi Merinodb916512015-02-18 16:04:24 +00001303 device_remove_file(&tz->device, &dev->weight_attr);
1304remove_trip_file:
Zhang Rui203d3d42008-01-17 15:51:08 +08001305 device_remove_file(&tz->device, &dev->attr);
Joe Perchescaca8b82012-03-21 12:55:02 -07001306remove_symbol_link:
Zhang Rui203d3d42008-01-17 15:51:08 +08001307 sysfs_remove_link(&tz->device.kobj, dev->name);
Joe Perchescaca8b82012-03-21 12:55:02 -07001308release_idr:
Zhang Rui203d3d42008-01-17 15:51:08 +08001309 release_idr(&tz->idr, &tz->lock, dev->id);
Joe Perchescaca8b82012-03-21 12:55:02 -07001310free_mem:
Zhang Rui203d3d42008-01-17 15:51:08 +08001311 kfree(dev);
1312 return result;
1313}
Eduardo Valentin910cb1e2013-04-23 21:48:15 +00001314EXPORT_SYMBOL_GPL(thermal_zone_bind_cooling_device);
Zhang Rui203d3d42008-01-17 15:51:08 +08001315
1316/**
Eduardo Valentin9892e5d2013-04-23 21:48:17 +00001317 * thermal_zone_unbind_cooling_device() - unbind a cooling device from a
1318 * thermal zone.
1319 * @tz: pointer to a struct thermal_zone_device.
Zhang Rui203d3d42008-01-17 15:51:08 +08001320 * @trip: indicates which trip point the cooling devices is
1321 * associated with in this thermal zone.
Eduardo Valentin9892e5d2013-04-23 21:48:17 +00001322 * @cdev: pointer to a struct thermal_cooling_device.
Len Brown543a9562008-02-07 16:55:08 -05001323 *
Eduardo Valentin9892e5d2013-04-23 21:48:17 +00001324 * This interface function unbind a thermal cooling device from the certain
1325 * trip point of a thermal zone device.
Len Brown543a9562008-02-07 16:55:08 -05001326 * This function is usually called in the thermal zone device .unbind callback.
Eduardo Valentin9892e5d2013-04-23 21:48:17 +00001327 *
1328 * Return: 0 on success, the proper error value otherwise.
Zhang Rui203d3d42008-01-17 15:51:08 +08001329 */
1330int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1331 int trip,
1332 struct thermal_cooling_device *cdev)
1333{
Zhang Ruib81b6ba2012-06-27 10:08:19 +08001334 struct thermal_instance *pos, *next;
Zhang Rui203d3d42008-01-17 15:51:08 +08001335
1336 mutex_lock(&tz->lock);
Zhang Ruif4a821c2012-07-24 16:56:21 +08001337 mutex_lock(&cdev->lock);
Zhang Ruicddf31b2012-06-27 10:09:36 +08001338 list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
Len Brown543a9562008-02-07 16:55:08 -05001339 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
Zhang Ruicddf31b2012-06-27 10:09:36 +08001340 list_del(&pos->tz_node);
Zhang Ruib5e4ae62012-06-27 14:11:52 +08001341 list_del(&pos->cdev_node);
Zhang Ruif4a821c2012-07-24 16:56:21 +08001342 mutex_unlock(&cdev->lock);
Zhang Rui203d3d42008-01-17 15:51:08 +08001343 mutex_unlock(&tz->lock);
1344 goto unbind;
1345 }
1346 }
Zhang Ruif4a821c2012-07-24 16:56:21 +08001347 mutex_unlock(&cdev->lock);
Zhang Rui203d3d42008-01-17 15:51:08 +08001348 mutex_unlock(&tz->lock);
1349
1350 return -ENODEV;
1351
Joe Perchescaca8b82012-03-21 12:55:02 -07001352unbind:
Viresh Kumar528464e2015-07-23 14:32:32 +05301353 device_remove_file(&tz->device, &pos->weight_attr);
Zhang Rui203d3d42008-01-17 15:51:08 +08001354 device_remove_file(&tz->device, &pos->attr);
1355 sysfs_remove_link(&tz->device.kobj, pos->name);
1356 release_idr(&tz->idr, &tz->lock, pos->id);
1357 kfree(pos);
1358 return 0;
1359}
Eduardo Valentin910cb1e2013-04-23 21:48:15 +00001360EXPORT_SYMBOL_GPL(thermal_zone_unbind_cooling_device);
Zhang Rui203d3d42008-01-17 15:51:08 +08001361
1362static void thermal_release(struct device *dev)
1363{
1364 struct thermal_zone_device *tz;
1365 struct thermal_cooling_device *cdev;
1366
Joe Perchescaca8b82012-03-21 12:55:02 -07001367 if (!strncmp(dev_name(dev), "thermal_zone",
1368 sizeof("thermal_zone") - 1)) {
Zhang Rui203d3d42008-01-17 15:51:08 +08001369 tz = to_thermal_zone(dev);
1370 kfree(tz);
durgadoss.r@intel.com732e4c82013-10-02 00:08:00 +05301371 } else if(!strncmp(dev_name(dev), "cooling_device",
1372 sizeof("cooling_device") - 1)){
Zhang Rui203d3d42008-01-17 15:51:08 +08001373 cdev = to_cooling_device(dev);
1374 kfree(cdev);
1375 }
1376}
1377
1378static struct class thermal_class = {
1379 .name = "thermal",
1380 .dev_release = thermal_release,
1381};
1382
1383/**
Eduardo Valentina116b5d2013-09-26 15:55:01 -04001384 * __thermal_cooling_device_register() - register a new thermal cooling device
1385 * @np: a pointer to a device tree node.
Zhang Rui203d3d42008-01-17 15:51:08 +08001386 * @type: the thermal cooling device type.
1387 * @devdata: device private data.
1388 * @ops: standard thermal cooling devices callbacks.
Eduardo Valentin3a6eccb2013-04-23 21:48:18 +00001389 *
1390 * This interface function adds a new thermal cooling device (fan/processor/...)
1391 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1392 * to all the thermal zone devices registered at the same time.
Eduardo Valentina116b5d2013-09-26 15:55:01 -04001393 * It also gives the opportunity to link the cooling device to a device tree
1394 * node, so that it can be bound to a thermal zone created out of device tree.
Eduardo Valentin3a6eccb2013-04-23 21:48:18 +00001395 *
1396 * Return: a pointer to the created struct thermal_cooling_device or an
1397 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
Zhang Rui203d3d42008-01-17 15:51:08 +08001398 */
Eduardo Valentina116b5d2013-09-26 15:55:01 -04001399static struct thermal_cooling_device *
1400__thermal_cooling_device_register(struct device_node *np,
1401 char *type, void *devdata,
1402 const struct thermal_cooling_device_ops *ops)
Zhang Rui203d3d42008-01-17 15:51:08 +08001403{
1404 struct thermal_cooling_device *cdev;
Zhang Rui203d3d42008-01-17 15:51:08 +08001405 int result;
1406
Guenter Roeck204dd1d2012-08-07 22:36:45 -07001407 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001408 return ERR_PTR(-EINVAL);
Zhang Rui203d3d42008-01-17 15:51:08 +08001409
1410 if (!ops || !ops->get_max_state || !ops->get_cur_state ||
Len Brown543a9562008-02-07 16:55:08 -05001411 !ops->set_cur_state)
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001412 return ERR_PTR(-EINVAL);
Zhang Rui203d3d42008-01-17 15:51:08 +08001413
1414 cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1415 if (!cdev)
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001416 return ERR_PTR(-ENOMEM);
Zhang Rui203d3d42008-01-17 15:51:08 +08001417
1418 result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1419 if (result) {
1420 kfree(cdev);
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001421 return ERR_PTR(result);
Zhang Rui203d3d42008-01-17 15:51:08 +08001422 }
1423
Eduardo Valentinc7a8b9d2013-04-23 21:48:12 +00001424 strlcpy(cdev->type, type ? : "", sizeof(cdev->type));
Zhang Ruif4a821c2012-07-24 16:56:21 +08001425 mutex_init(&cdev->lock);
Zhang Ruib5e4ae62012-06-27 14:11:52 +08001426 INIT_LIST_HEAD(&cdev->thermal_instances);
Eduardo Valentina116b5d2013-09-26 15:55:01 -04001427 cdev->np = np;
Zhang Rui203d3d42008-01-17 15:51:08 +08001428 cdev->ops = ops;
Ni Wade5ca0cce2014-02-17 11:02:55 +08001429 cdev->updated = false;
Zhang Rui203d3d42008-01-17 15:51:08 +08001430 cdev->device.class = &thermal_class;
Matthias Kaehlcke2dc10f82015-02-20 18:10:08 -08001431 cdev->device.groups = cooling_device_attr_groups;
Zhang Rui203d3d42008-01-17 15:51:08 +08001432 cdev->devdata = devdata;
Kay Sievers354655e2009-01-06 10:44:37 -08001433 dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
Zhang Rui203d3d42008-01-17 15:51:08 +08001434 result = device_register(&cdev->device);
1435 if (result) {
1436 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1437 kfree(cdev);
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001438 return ERR_PTR(result);
Zhang Rui203d3d42008-01-17 15:51:08 +08001439 }
1440
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301441 /* Add 'this' new cdev to the global cdev list */
Zhang Rui203d3d42008-01-17 15:51:08 +08001442 mutex_lock(&thermal_list_lock);
1443 list_add(&cdev->node, &thermal_cdev_list);
Zhang Rui203d3d42008-01-17 15:51:08 +08001444 mutex_unlock(&thermal_list_lock);
1445
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301446 /* Update binding information for 'this' new cdev */
1447 bind_cdev(cdev);
1448
1449 return cdev;
Zhang Rui203d3d42008-01-17 15:51:08 +08001450}
Eduardo Valentina116b5d2013-09-26 15:55:01 -04001451
1452/**
1453 * thermal_cooling_device_register() - register a new thermal cooling device
1454 * @type: the thermal cooling device type.
1455 * @devdata: device private data.
1456 * @ops: standard thermal cooling devices callbacks.
1457 *
1458 * This interface function adds a new thermal cooling device (fan/processor/...)
1459 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1460 * to all the thermal zone devices registered at the same time.
1461 *
1462 * Return: a pointer to the created struct thermal_cooling_device or an
1463 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1464 */
1465struct thermal_cooling_device *
1466thermal_cooling_device_register(char *type, void *devdata,
1467 const struct thermal_cooling_device_ops *ops)
1468{
1469 return __thermal_cooling_device_register(NULL, type, devdata, ops);
1470}
Eduardo Valentin910cb1e2013-04-23 21:48:15 +00001471EXPORT_SYMBOL_GPL(thermal_cooling_device_register);
Zhang Rui203d3d42008-01-17 15:51:08 +08001472
1473/**
Eduardo Valentina116b5d2013-09-26 15:55:01 -04001474 * thermal_of_cooling_device_register() - register an OF thermal cooling device
1475 * @np: a pointer to a device tree node.
1476 * @type: the thermal cooling device type.
1477 * @devdata: device private data.
1478 * @ops: standard thermal cooling devices callbacks.
1479 *
1480 * This function will register a cooling device with device tree node reference.
1481 * This interface function adds a new thermal cooling device (fan/processor/...)
1482 * to /sys/class/thermal/ folder as cooling_device[0-*]. It tries to bind itself
1483 * to all the thermal zone devices registered at the same time.
1484 *
1485 * Return: a pointer to the created struct thermal_cooling_device or an
1486 * ERR_PTR. Caller must check return value with IS_ERR*() helpers.
1487 */
1488struct thermal_cooling_device *
1489thermal_of_cooling_device_register(struct device_node *np,
1490 char *type, void *devdata,
1491 const struct thermal_cooling_device_ops *ops)
1492{
1493 return __thermal_cooling_device_register(np, type, devdata, ops);
1494}
1495EXPORT_SYMBOL_GPL(thermal_of_cooling_device_register);
1496
1497/**
Zhang Rui203d3d42008-01-17 15:51:08 +08001498 * thermal_cooling_device_unregister - removes the registered thermal cooling device
Zhang Rui203d3d42008-01-17 15:51:08 +08001499 * @cdev: the thermal cooling device to remove.
1500 *
1501 * thermal_cooling_device_unregister() must be called when the device is no
1502 * longer needed.
1503 */
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301504void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
Zhang Rui203d3d42008-01-17 15:51:08 +08001505{
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301506 int i;
1507 const struct thermal_zone_params *tzp;
Zhang Rui203d3d42008-01-17 15:51:08 +08001508 struct thermal_zone_device *tz;
1509 struct thermal_cooling_device *pos = NULL;
1510
1511 if (!cdev)
1512 return;
1513
1514 mutex_lock(&thermal_list_lock);
1515 list_for_each_entry(pos, &thermal_cdev_list, node)
1516 if (pos == cdev)
1517 break;
1518 if (pos != cdev) {
1519 /* thermal cooling device not found */
1520 mutex_unlock(&thermal_list_lock);
1521 return;
1522 }
1523 list_del(&cdev->node);
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301524
1525 /* Unbind all thermal zones associated with 'this' cdev */
Zhang Rui203d3d42008-01-17 15:51:08 +08001526 list_for_each_entry(tz, &thermal_tz_list, node) {
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301527 if (tz->ops->unbind) {
1528 tz->ops->unbind(tz, cdev);
Zhang Rui203d3d42008-01-17 15:51:08 +08001529 continue;
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301530 }
1531
1532 if (!tz->tzp || !tz->tzp->tbp)
1533 continue;
1534
1535 tzp = tz->tzp;
1536 for (i = 0; i < tzp->num_tbps; i++) {
1537 if (tzp->tbp[i].cdev == cdev) {
1538 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1539 tzp->tbp[i].cdev = NULL;
1540 }
1541 }
Zhang Rui203d3d42008-01-17 15:51:08 +08001542 }
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301543
Zhang Rui203d3d42008-01-17 15:51:08 +08001544 mutex_unlock(&thermal_list_lock);
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301545
Zhang Rui203d3d42008-01-17 15:51:08 +08001546 if (cdev->type[0])
Len Brown543a9562008-02-07 16:55:08 -05001547 device_remove_file(&cdev->device, &dev_attr_cdev_type);
Zhang Rui203d3d42008-01-17 15:51:08 +08001548 device_remove_file(&cdev->device, &dev_attr_max_state);
1549 device_remove_file(&cdev->device, &dev_attr_cur_state);
1550
1551 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1552 device_unregister(&cdev->device);
1553 return;
1554}
Eduardo Valentin910cb1e2013-04-23 21:48:15 +00001555EXPORT_SYMBOL_GPL(thermal_cooling_device_unregister);
Zhang Rui203d3d42008-01-17 15:51:08 +08001556
Durgadoss Rdc765482012-09-18 11:05:00 +05301557void thermal_cdev_update(struct thermal_cooling_device *cdev)
Zhang Ruice119f82012-06-27 14:13:04 +08001558{
1559 struct thermal_instance *instance;
1560 unsigned long target = 0;
1561
1562 /* cooling device is updated*/
1563 if (cdev->updated)
1564 return;
1565
Zhang Ruif4a821c2012-07-24 16:56:21 +08001566 mutex_lock(&cdev->lock);
Zhang Ruice119f82012-06-27 14:13:04 +08001567 /* Make sure cdev enters the deepest cooling state */
1568 list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
Aaron Lu06475b52013-12-02 13:54:26 +08001569 dev_dbg(&cdev->device, "zone%d->target=%lu\n",
1570 instance->tz->id, instance->target);
Zhang Ruice119f82012-06-27 14:13:04 +08001571 if (instance->target == THERMAL_NO_TARGET)
1572 continue;
1573 if (instance->target > target)
1574 target = instance->target;
1575 }
Zhang Ruif4a821c2012-07-24 16:56:21 +08001576 mutex_unlock(&cdev->lock);
Zhang Ruice119f82012-06-27 14:13:04 +08001577 cdev->ops->set_cur_state(cdev, target);
1578 cdev->updated = true;
Punit Agrawal39811562014-07-29 11:50:49 +01001579 trace_cdev_update(cdev, target);
Aaron Lu06475b52013-12-02 13:54:26 +08001580 dev_dbg(&cdev->device, "set to state %lu\n", target);
Zhang Ruice119f82012-06-27 14:13:04 +08001581}
Durgadoss Rdc765482012-09-18 11:05:00 +05301582EXPORT_SYMBOL(thermal_cdev_update);
Zhang Ruice119f82012-06-27 14:13:04 +08001583
Matthew Garrettb1569e92008-12-03 17:55:32 +00001584/**
Eduardo Valentin7b73c992013-04-23 21:48:14 +00001585 * thermal_notify_framework - Sensor drivers use this API to notify framework
Durgadoss Rf2b4caa2012-09-18 11:05:05 +05301586 * @tz: thermal zone device
1587 * @trip: indicates which trip point has been crossed
1588 *
1589 * This function handles the trip events from sensor drivers. It starts
1590 * throttling the cooling devices according to the policy configured.
1591 * For CRITICAL and HOT trip points, this notifies the respective drivers,
1592 * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1593 * The throttling policy is based on the configured platform data; if no
1594 * platform data is provided, this uses the step_wise throttling policy.
1595 */
Eduardo Valentin7b73c992013-04-23 21:48:14 +00001596void thermal_notify_framework(struct thermal_zone_device *tz, int trip)
Durgadoss Rf2b4caa2012-09-18 11:05:05 +05301597{
1598 handle_thermal_trip(tz, trip);
1599}
Eduardo Valentin910cb1e2013-04-23 21:48:15 +00001600EXPORT_SYMBOL_GPL(thermal_notify_framework);
Durgadoss Rf2b4caa2012-09-18 11:05:05 +05301601
1602/**
Eduardo Valentin269c1742013-04-23 21:48:19 +00001603 * create_trip_attrs() - create attributes for trip points
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001604 * @tz: the thermal zone device
1605 * @mask: Writeable trip point bitmap.
Eduardo Valentin269c1742013-04-23 21:48:19 +00001606 *
1607 * helper function to instantiate sysfs entries for every trip
1608 * point and its properties of a struct thermal_zone_device.
1609 *
1610 * Return: 0 on success, the proper error value otherwise.
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001611 */
1612static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1613{
1614 int indx;
Durgadoss R27365a62012-07-25 10:10:59 +08001615 int size = sizeof(struct thermal_attr) * tz->trips;
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001616
Durgadoss R27365a62012-07-25 10:10:59 +08001617 tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001618 if (!tz->trip_type_attrs)
1619 return -ENOMEM;
1620
Durgadoss R27365a62012-07-25 10:10:59 +08001621 tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001622 if (!tz->trip_temp_attrs) {
1623 kfree(tz->trip_type_attrs);
1624 return -ENOMEM;
1625 }
1626
Durgadoss R27365a62012-07-25 10:10:59 +08001627 if (tz->ops->get_trip_hyst) {
1628 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1629 if (!tz->trip_hyst_attrs) {
1630 kfree(tz->trip_type_attrs);
1631 kfree(tz->trip_temp_attrs);
1632 return -ENOMEM;
1633 }
1634 }
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001635
Durgadoss R27365a62012-07-25 10:10:59 +08001636
1637 for (indx = 0; indx < tz->trips; indx++) {
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001638 /* create trip type attribute */
1639 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1640 "trip_point_%d_type", indx);
1641
1642 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1643 tz->trip_type_attrs[indx].attr.attr.name =
1644 tz->trip_type_attrs[indx].name;
1645 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1646 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1647
1648 device_create_file(&tz->device,
1649 &tz->trip_type_attrs[indx].attr);
1650
1651 /* create trip temp attribute */
1652 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1653 "trip_point_%d_temp", indx);
1654
1655 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1656 tz->trip_temp_attrs[indx].attr.attr.name =
1657 tz->trip_temp_attrs[indx].name;
1658 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1659 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
Punit Agrawal35e94642015-03-03 10:43:03 +00001660 if (IS_ENABLED(CONFIG_THERMAL_WRITABLE_TRIPS) &&
1661 mask & (1 << indx)) {
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001662 tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1663 tz->trip_temp_attrs[indx].attr.store =
1664 trip_point_temp_store;
1665 }
1666
1667 device_create_file(&tz->device,
1668 &tz->trip_temp_attrs[indx].attr);
Durgadoss R27365a62012-07-25 10:10:59 +08001669
1670 /* create Optional trip hyst attribute */
1671 if (!tz->ops->get_trip_hyst)
1672 continue;
1673 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1674 "trip_point_%d_hyst", indx);
1675
1676 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1677 tz->trip_hyst_attrs[indx].attr.attr.name =
1678 tz->trip_hyst_attrs[indx].name;
1679 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1680 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1681 if (tz->ops->set_trip_hyst) {
1682 tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1683 tz->trip_hyst_attrs[indx].attr.store =
1684 trip_point_hyst_store;
1685 }
1686
1687 device_create_file(&tz->device,
1688 &tz->trip_hyst_attrs[indx].attr);
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001689 }
1690 return 0;
1691}
1692
1693static void remove_trip_attrs(struct thermal_zone_device *tz)
1694{
1695 int indx;
1696
1697 for (indx = 0; indx < tz->trips; indx++) {
1698 device_remove_file(&tz->device,
1699 &tz->trip_type_attrs[indx].attr);
1700 device_remove_file(&tz->device,
1701 &tz->trip_temp_attrs[indx].attr);
Durgadoss R27365a62012-07-25 10:10:59 +08001702 if (tz->ops->get_trip_hyst)
1703 device_remove_file(&tz->device,
1704 &tz->trip_hyst_attrs[indx].attr);
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001705 }
1706 kfree(tz->trip_type_attrs);
1707 kfree(tz->trip_temp_attrs);
Durgadoss R27365a62012-07-25 10:10:59 +08001708 kfree(tz->trip_hyst_attrs);
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001709}
1710
1711/**
Eduardo Valentina00e55f2013-04-23 21:48:20 +00001712 * thermal_zone_device_register() - register a new thermal zone device
Zhang Rui203d3d42008-01-17 15:51:08 +08001713 * @type: the thermal zone device type
1714 * @trips: the number of trip points the thermal zone support
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001715 * @mask: a bit string indicating the writeablility of trip points
Zhang Rui203d3d42008-01-17 15:51:08 +08001716 * @devdata: private device data
1717 * @ops: standard thermal zone device callbacks
Durgadoss R50125a92012-09-18 11:04:56 +05301718 * @tzp: thermal zone platform parameters
Matthew Garrettb1569e92008-12-03 17:55:32 +00001719 * @passive_delay: number of milliseconds to wait between polls when
1720 * performing passive cooling
1721 * @polling_delay: number of milliseconds to wait between polls when checking
1722 * whether trip points have been crossed (0 for interrupt
1723 * driven systems)
Zhang Rui203d3d42008-01-17 15:51:08 +08001724 *
Eduardo Valentina00e55f2013-04-23 21:48:20 +00001725 * This interface function adds a new thermal zone device (sensor) to
1726 * /sys/class/thermal folder as thermal_zone[0-*]. It tries to bind all the
1727 * thermal cooling devices registered at the same time.
Zhang Rui203d3d42008-01-17 15:51:08 +08001728 * thermal_zone_device_unregister() must be called when the device is no
Zhang Rui1b7ddb82012-06-27 09:51:12 +08001729 * longer needed. The passive cooling depends on the .get_trend() return value.
Eduardo Valentina00e55f2013-04-23 21:48:20 +00001730 *
1731 * Return: a pointer to the created struct thermal_zone_device or an
1732 * in case of error, an ERR_PTR. Caller must check return value with
1733 * IS_ERR*() helpers.
Zhang Rui203d3d42008-01-17 15:51:08 +08001734 */
Anton Vorontsov4b1bf582012-07-31 04:39:30 -07001735struct thermal_zone_device *thermal_zone_device_register(const char *type,
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001736 int trips, int mask, void *devdata,
Eduardo Valentin4e5e4702013-07-03 15:35:39 -04001737 struct thermal_zone_device_ops *ops,
Javi Merino6b775e82015-03-02 17:17:19 +00001738 struct thermal_zone_params *tzp,
Zhang Rui1b7ddb82012-06-27 09:51:12 +08001739 int passive_delay, int polling_delay)
Zhang Rui203d3d42008-01-17 15:51:08 +08001740{
1741 struct thermal_zone_device *tz;
Matthew Garrett03a971a2008-12-03 18:00:38 +00001742 enum thermal_trip_type trip_type;
Zhang Rui203d3d42008-01-17 15:51:08 +08001743 int result;
1744 int count;
Matthew Garrett03a971a2008-12-03 18:00:38 +00001745 int passive = 0;
Javi Merinoe33df1d2015-02-26 19:00:27 +00001746 struct thermal_governor *governor;
Zhang Rui203d3d42008-01-17 15:51:08 +08001747
Guenter Roeck204dd1d2012-08-07 22:36:45 -07001748 if (type && strlen(type) >= THERMAL_NAME_LENGTH)
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001749 return ERR_PTR(-EINVAL);
Zhang Rui203d3d42008-01-17 15:51:08 +08001750
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001751 if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001752 return ERR_PTR(-EINVAL);
Zhang Rui203d3d42008-01-17 15:51:08 +08001753
Eduardo Valentin81bd4e12013-09-12 19:15:44 -04001754 if (!ops)
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001755 return ERR_PTR(-EINVAL);
Zhang Rui203d3d42008-01-17 15:51:08 +08001756
Jonghwa Lee83720d02013-05-18 09:50:26 +00001757 if (trips > 0 && (!ops->get_trip_type || !ops->get_trip_temp))
Eduardo Valentin6b2aa512013-01-02 15:29:42 +00001758 return ERR_PTR(-EINVAL);
1759
Zhang Rui203d3d42008-01-17 15:51:08 +08001760 tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1761 if (!tz)
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001762 return ERR_PTR(-ENOMEM);
Zhang Rui203d3d42008-01-17 15:51:08 +08001763
Zhang Rui2d374132012-06-27 10:09:00 +08001764 INIT_LIST_HEAD(&tz->thermal_instances);
Zhang Rui203d3d42008-01-17 15:51:08 +08001765 idr_init(&tz->idr);
1766 mutex_init(&tz->lock);
1767 result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1768 if (result) {
1769 kfree(tz);
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001770 return ERR_PTR(result);
Zhang Rui203d3d42008-01-17 15:51:08 +08001771 }
1772
Eduardo Valentinc7a8b9d2013-04-23 21:48:12 +00001773 strlcpy(tz->type, type ? : "", sizeof(tz->type));
Zhang Rui203d3d42008-01-17 15:51:08 +08001774 tz->ops = ops;
Durgadoss R50125a92012-09-18 11:04:56 +05301775 tz->tzp = tzp;
Zhang Rui203d3d42008-01-17 15:51:08 +08001776 tz->device.class = &thermal_class;
1777 tz->devdata = devdata;
1778 tz->trips = trips;
Matthew Garrettb1569e92008-12-03 17:55:32 +00001779 tz->passive_delay = passive_delay;
1780 tz->polling_delay = polling_delay;
1781
Kay Sievers354655e2009-01-06 10:44:37 -08001782 dev_set_name(&tz->device, "thermal_zone%d", tz->id);
Zhang Rui203d3d42008-01-17 15:51:08 +08001783 result = device_register(&tz->device);
1784 if (result) {
1785 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1786 kfree(tz);
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001787 return ERR_PTR(result);
Zhang Rui203d3d42008-01-17 15:51:08 +08001788 }
1789
1790 /* sys I/F */
1791 if (type) {
1792 result = device_create_file(&tz->device, &dev_attr_type);
1793 if (result)
1794 goto unregister;
1795 }
1796
1797 result = device_create_file(&tz->device, &dev_attr_temp);
1798 if (result)
1799 goto unregister;
1800
1801 if (ops->get_mode) {
1802 result = device_create_file(&tz->device, &dev_attr_mode);
1803 if (result)
1804 goto unregister;
1805 }
1806
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001807 result = create_trip_attrs(tz, mask);
1808 if (result)
1809 goto unregister;
1810
Zhang Rui203d3d42008-01-17 15:51:08 +08001811 for (count = 0; count < trips; count++) {
Matthew Garrett03a971a2008-12-03 18:00:38 +00001812 tz->ops->get_trip_type(tz, count, &trip_type);
1813 if (trip_type == THERMAL_TRIP_PASSIVE)
1814 passive = 1;
Zhang Rui203d3d42008-01-17 15:51:08 +08001815 }
1816
Durgadoss R5a2c0902012-09-18 11:04:58 +05301817 if (!passive) {
1818 result = device_create_file(&tz->device, &dev_attr_passive);
1819 if (result)
1820 goto unregister;
1821 }
Matthew Garrett03a971a2008-12-03 18:00:38 +00001822
Sascha Hauer79e54212015-07-06 09:46:16 +02001823 if (IS_ENABLED(CONFIG_THERMAL_EMULATION)) {
1824 result = device_create_file(&tz->device, &dev_attr_emul_temp);
1825 if (result)
1826 goto unregister;
1827 }
1828
Durgadoss R5a2c0902012-09-18 11:04:58 +05301829 /* Create policy attribute */
1830 result = device_create_file(&tz->device, &dev_attr_policy);
Matthew Garrett03a971a2008-12-03 18:00:38 +00001831 if (result)
1832 goto unregister;
1833
Javi Merino9f382712015-03-26 15:53:02 +00001834 /* Add thermal zone params */
1835 result = create_tzp_attrs(&tz->device);
1836 if (result)
1837 goto unregister;
1838
Ni Wade25a0a5c2015-07-14 15:40:56 +08001839 /* Create available_policies attribute */
1840 result = device_create_file(&tz->device, &dev_attr_available_policies);
1841 if (result)
1842 goto unregister;
1843
Durgadoss Ra4a15482012-09-18 11:04:57 +05301844 /* Update 'this' zone's governor information */
1845 mutex_lock(&thermal_governor_lock);
1846
1847 if (tz->tzp)
Javi Merinoe33df1d2015-02-26 19:00:27 +00001848 governor = __find_governor(tz->tzp->governor_name);
Durgadoss Ra4a15482012-09-18 11:04:57 +05301849 else
Javi Merinoe33df1d2015-02-26 19:00:27 +00001850 governor = def_governor;
1851
1852 result = thermal_set_governor(tz, governor);
1853 if (result) {
1854 mutex_unlock(&thermal_governor_lock);
1855 goto unregister;
1856 }
Durgadoss Ra4a15482012-09-18 11:04:57 +05301857
1858 mutex_unlock(&thermal_governor_lock);
1859
Eduardo Valentinccba4ff2013-08-15 11:34:17 -04001860 if (!tz->tzp || !tz->tzp->no_hwmon) {
1861 result = thermal_add_hwmon_sysfs(tz);
1862 if (result)
1863 goto unregister;
1864 }
Zhang Ruie68b16a2008-04-21 16:07:52 +08001865
Zhang Rui203d3d42008-01-17 15:51:08 +08001866 mutex_lock(&thermal_list_lock);
1867 list_add_tail(&tz->node, &thermal_tz_list);
Zhang Rui203d3d42008-01-17 15:51:08 +08001868 mutex_unlock(&thermal_list_lock);
1869
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301870 /* Bind cooling devices for this zone */
1871 bind_tz(tz);
1872
Matthew Garrettb1569e92008-12-03 17:55:32 +00001873 INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1874
1875 thermal_zone_device_update(tz);
1876
Yao Dongdong14015862014-10-28 07:40:25 +00001877 return tz;
Zhang Rui203d3d42008-01-17 15:51:08 +08001878
Joe Perchescaca8b82012-03-21 12:55:02 -07001879unregister:
Zhang Rui203d3d42008-01-17 15:51:08 +08001880 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1881 device_unregister(&tz->device);
Thomas Sujith3e6fda52008-02-15 00:59:50 -05001882 return ERR_PTR(result);
Zhang Rui203d3d42008-01-17 15:51:08 +08001883}
Eduardo Valentin910cb1e2013-04-23 21:48:15 +00001884EXPORT_SYMBOL_GPL(thermal_zone_device_register);
Zhang Rui203d3d42008-01-17 15:51:08 +08001885
1886/**
1887 * thermal_device_unregister - removes the registered thermal zone device
Zhang Rui203d3d42008-01-17 15:51:08 +08001888 * @tz: the thermal zone device to remove
1889 */
1890void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1891{
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301892 int i;
1893 const struct thermal_zone_params *tzp;
Zhang Rui203d3d42008-01-17 15:51:08 +08001894 struct thermal_cooling_device *cdev;
1895 struct thermal_zone_device *pos = NULL;
Zhang Rui203d3d42008-01-17 15:51:08 +08001896
1897 if (!tz)
1898 return;
1899
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301900 tzp = tz->tzp;
1901
Zhang Rui203d3d42008-01-17 15:51:08 +08001902 mutex_lock(&thermal_list_lock);
1903 list_for_each_entry(pos, &thermal_tz_list, node)
1904 if (pos == tz)
1905 break;
1906 if (pos != tz) {
1907 /* thermal zone device not found */
1908 mutex_unlock(&thermal_list_lock);
1909 return;
1910 }
1911 list_del(&tz->node);
Durgadoss R7e8ee1e2012-09-18 11:04:59 +05301912
1913 /* Unbind all cdevs associated with 'this' thermal zone */
1914 list_for_each_entry(cdev, &thermal_cdev_list, node) {
1915 if (tz->ops->unbind) {
1916 tz->ops->unbind(tz, cdev);
1917 continue;
1918 }
1919
1920 if (!tzp || !tzp->tbp)
1921 break;
1922
1923 for (i = 0; i < tzp->num_tbps; i++) {
1924 if (tzp->tbp[i].cdev == cdev) {
1925 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1926 tzp->tbp[i].cdev = NULL;
1927 }
1928 }
1929 }
1930
Zhang Rui203d3d42008-01-17 15:51:08 +08001931 mutex_unlock(&thermal_list_lock);
1932
Matthew Garrettb1569e92008-12-03 17:55:32 +00001933 thermal_zone_device_set_polling(tz, 0);
1934
Zhang Rui203d3d42008-01-17 15:51:08 +08001935 if (tz->type[0])
1936 device_remove_file(&tz->device, &dev_attr_type);
1937 device_remove_file(&tz->device, &dev_attr_temp);
1938 if (tz->ops->get_mode)
1939 device_remove_file(&tz->device, &dev_attr_mode);
Durgadoss R5a2c0902012-09-18 11:04:58 +05301940 device_remove_file(&tz->device, &dev_attr_policy);
Ni Wade25a0a5c2015-07-14 15:40:56 +08001941 device_remove_file(&tz->device, &dev_attr_available_policies);
Durgadoss Rc56f5c02012-07-25 10:10:58 +08001942 remove_trip_attrs(tz);
Javi Merinoe33df1d2015-02-26 19:00:27 +00001943 thermal_set_governor(tz, NULL);
Zhang Rui203d3d42008-01-17 15:51:08 +08001944
Zhang Ruie68b16a2008-04-21 16:07:52 +08001945 thermal_remove_hwmon_sysfs(tz);
Zhang Rui203d3d42008-01-17 15:51:08 +08001946 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1947 idr_destroy(&tz->idr);
1948 mutex_destroy(&tz->lock);
1949 device_unregister(&tz->device);
1950 return;
1951}
Eduardo Valentin910cb1e2013-04-23 21:48:15 +00001952EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);
Zhang Rui203d3d42008-01-17 15:51:08 +08001953
Eduardo Valentin63c4d912013-04-05 12:32:28 +00001954/**
1955 * thermal_zone_get_zone_by_name() - search for a zone and returns its ref
1956 * @name: thermal zone name to fetch the temperature
1957 *
1958 * When only one zone is found with the passed name, returns a reference to it.
1959 *
1960 * Return: On success returns a reference to an unique thermal zone with
1961 * matching name equals to @name, an ERR_PTR otherwise (-EINVAL for invalid
1962 * paramenters, -ENODEV for not found and -EEXIST for multiple matches).
1963 */
1964struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name)
1965{
1966 struct thermal_zone_device *pos = NULL, *ref = ERR_PTR(-EINVAL);
1967 unsigned int found = 0;
1968
1969 if (!name)
1970 goto exit;
1971
1972 mutex_lock(&thermal_list_lock);
1973 list_for_each_entry(pos, &thermal_tz_list, node)
Rasmus Villemoes484ac2f2014-10-13 15:55:01 -07001974 if (!strncasecmp(name, pos->type, THERMAL_NAME_LENGTH)) {
Eduardo Valentin63c4d912013-04-05 12:32:28 +00001975 found++;
1976 ref = pos;
1977 }
1978 mutex_unlock(&thermal_list_lock);
1979
1980 /* nothing has been found, thus an error code for it */
1981 if (found == 0)
1982 ref = ERR_PTR(-ENODEV);
1983 else if (found > 1)
1984 /* Success only when an unique zone is found */
1985 ref = ERR_PTR(-EEXIST);
1986
1987exit:
1988 return ref;
1989}
1990EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
1991
Rafael J. Wysockiaf062162011-03-01 01:12:19 +01001992#ifdef CONFIG_NET
Johannes Berg2a94fe42013-11-19 15:19:39 +01001993static const struct genl_multicast_group thermal_event_mcgrps[] = {
1994 { .name = THERMAL_GENL_MCAST_GROUP_NAME, },
1995};
1996
Rafael J. Wysockiaf062162011-03-01 01:12:19 +01001997static struct genl_family thermal_event_genl_family = {
1998 .id = GENL_ID_GENERATE,
1999 .name = THERMAL_GENL_FAMILY_NAME,
2000 .version = THERMAL_GENL_VERSION,
2001 .maxattr = THERMAL_GENL_ATTR_MAX,
Johannes Berg2a94fe42013-11-19 15:19:39 +01002002 .mcgrps = thermal_event_mcgrps,
2003 .n_mcgrps = ARRAY_SIZE(thermal_event_mcgrps),
Rafael J. Wysockiaf062162011-03-01 01:12:19 +01002004};
2005
Eduardo Valentin8ab3e6a2013-01-02 15:29:39 +00002006int thermal_generate_netlink_event(struct thermal_zone_device *tz,
2007 enum events event)
R.Durgadoss4cb18722010-10-27 03:33:29 +05302008{
2009 struct sk_buff *skb;
2010 struct nlattr *attr;
2011 struct thermal_genl_event *thermal_event;
2012 void *msg_header;
2013 int size;
2014 int result;
Fabio Estevamb11de072012-03-21 12:55:00 -07002015 static unsigned int thermal_event_seqnum;
R.Durgadoss4cb18722010-10-27 03:33:29 +05302016
Eduardo Valentin8ab3e6a2013-01-02 15:29:39 +00002017 if (!tz)
2018 return -EINVAL;
2019
R.Durgadoss4cb18722010-10-27 03:33:29 +05302020 /* allocate memory */
Joe Perches886ee542012-03-21 12:55:01 -07002021 size = nla_total_size(sizeof(struct thermal_genl_event)) +
2022 nla_total_size(0);
R.Durgadoss4cb18722010-10-27 03:33:29 +05302023
2024 skb = genlmsg_new(size, GFP_ATOMIC);
2025 if (!skb)
2026 return -ENOMEM;
2027
2028 /* add the genetlink message header */
2029 msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
2030 &thermal_event_genl_family, 0,
2031 THERMAL_GENL_CMD_EVENT);
2032 if (!msg_header) {
2033 nlmsg_free(skb);
2034 return -ENOMEM;
2035 }
2036
2037 /* fill the data */
Joe Perches886ee542012-03-21 12:55:01 -07002038 attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
2039 sizeof(struct thermal_genl_event));
R.Durgadoss4cb18722010-10-27 03:33:29 +05302040
2041 if (!attr) {
2042 nlmsg_free(skb);
2043 return -EINVAL;
2044 }
2045
2046 thermal_event = nla_data(attr);
2047 if (!thermal_event) {
2048 nlmsg_free(skb);
2049 return -EINVAL;
2050 }
2051
2052 memset(thermal_event, 0, sizeof(struct thermal_genl_event));
2053
Eduardo Valentin8ab3e6a2013-01-02 15:29:39 +00002054 thermal_event->orig = tz->id;
R.Durgadoss4cb18722010-10-27 03:33:29 +05302055 thermal_event->event = event;
2056
2057 /* send multicast genetlink message */
Johannes Berg053c0952015-01-16 22:09:00 +01002058 genlmsg_end(skb, msg_header);
R.Durgadoss4cb18722010-10-27 03:33:29 +05302059
Johannes Berg68eb5502013-11-19 15:19:38 +01002060 result = genlmsg_multicast(&thermal_event_genl_family, skb, 0,
Johannes Berg2a94fe42013-11-19 15:19:39 +01002061 0, GFP_ATOMIC);
R.Durgadoss4cb18722010-10-27 03:33:29 +05302062 if (result)
Eduardo Valentin923e0b12013-01-02 15:29:41 +00002063 dev_err(&tz->device, "Failed to send netlink event:%d", result);
R.Durgadoss4cb18722010-10-27 03:33:29 +05302064
2065 return result;
2066}
Eduardo Valentin910cb1e2013-04-23 21:48:15 +00002067EXPORT_SYMBOL_GPL(thermal_generate_netlink_event);
R.Durgadoss4cb18722010-10-27 03:33:29 +05302068
2069static int genetlink_init(void)
2070{
Johannes Berg2a94fe42013-11-19 15:19:39 +01002071 return genl_register_family(&thermal_event_genl_family);
R.Durgadoss4cb18722010-10-27 03:33:29 +05302072}
2073
Rafael J. Wysockiaf062162011-03-01 01:12:19 +01002074static void genetlink_exit(void)
2075{
2076 genl_unregister_family(&thermal_event_genl_family);
2077}
2078#else /* !CONFIG_NET */
2079static inline int genetlink_init(void) { return 0; }
2080static inline void genetlink_exit(void) {}
2081#endif /* !CONFIG_NET */
2082
Zhang Rui80a26a52013-03-26 16:38:29 +08002083static int __init thermal_register_governors(void)
2084{
2085 int result;
2086
2087 result = thermal_gov_step_wise_register();
2088 if (result)
2089 return result;
2090
2091 result = thermal_gov_fair_share_register();
2092 if (result)
2093 return result;
2094
Peter Feuerere4dbf982014-07-22 17:37:13 +02002095 result = thermal_gov_bang_bang_register();
2096 if (result)
2097 return result;
2098
Javi Merino6b775e82015-03-02 17:17:19 +00002099 result = thermal_gov_user_space_register();
2100 if (result)
2101 return result;
2102
2103 return thermal_gov_power_allocator_register();
Zhang Rui80a26a52013-03-26 16:38:29 +08002104}
2105
2106static void thermal_unregister_governors(void)
2107{
2108 thermal_gov_step_wise_unregister();
2109 thermal_gov_fair_share_unregister();
Peter Feuerere4dbf982014-07-22 17:37:13 +02002110 thermal_gov_bang_bang_unregister();
Zhang Rui80a26a52013-03-26 16:38:29 +08002111 thermal_gov_user_space_unregister();
Javi Merino6b775e82015-03-02 17:17:19 +00002112 thermal_gov_power_allocator_unregister();
Zhang Rui80a26a52013-03-26 16:38:29 +08002113}
2114
Zhang Rui203d3d42008-01-17 15:51:08 +08002115static int __init thermal_init(void)
2116{
Zhang Rui80a26a52013-03-26 16:38:29 +08002117 int result;
2118
2119 result = thermal_register_governors();
2120 if (result)
2121 goto error;
Zhang Rui203d3d42008-01-17 15:51:08 +08002122
2123 result = class_register(&thermal_class);
Zhang Rui80a26a52013-03-26 16:38:29 +08002124 if (result)
2125 goto unregister_governors;
2126
R.Durgadoss4cb18722010-10-27 03:33:29 +05302127 result = genetlink_init();
Zhang Rui80a26a52013-03-26 16:38:29 +08002128 if (result)
2129 goto unregister_class;
2130
Eduardo Valentin4e5e4702013-07-03 15:35:39 -04002131 result = of_parse_thermal_zones();
2132 if (result)
2133 goto exit_netlink;
2134
Zhang Rui80a26a52013-03-26 16:38:29 +08002135 return 0;
2136
Eduardo Valentin4e5e4702013-07-03 15:35:39 -04002137exit_netlink:
2138 genetlink_exit();
Zhang Rui80a26a52013-03-26 16:38:29 +08002139unregister_class:
2140 class_unregister(&thermal_class);
Luis Henriques9d367e52014-12-03 21:20:21 +00002141unregister_governors:
2142 thermal_unregister_governors();
Zhang Rui80a26a52013-03-26 16:38:29 +08002143error:
2144 idr_destroy(&thermal_tz_idr);
2145 idr_destroy(&thermal_cdev_idr);
2146 mutex_destroy(&thermal_idr_lock);
2147 mutex_destroy(&thermal_list_lock);
2148 mutex_destroy(&thermal_governor_lock);
Zhang Rui203d3d42008-01-17 15:51:08 +08002149 return result;
2150}
2151
2152static void __exit thermal_exit(void)
2153{
Eduardo Valentin4e5e4702013-07-03 15:35:39 -04002154 of_thermal_destroy_zones();
Zhang Rui80a26a52013-03-26 16:38:29 +08002155 genetlink_exit();
Zhang Rui203d3d42008-01-17 15:51:08 +08002156 class_unregister(&thermal_class);
Zhang Rui80a26a52013-03-26 16:38:29 +08002157 thermal_unregister_governors();
Zhang Rui203d3d42008-01-17 15:51:08 +08002158 idr_destroy(&thermal_tz_idr);
2159 idr_destroy(&thermal_cdev_idr);
2160 mutex_destroy(&thermal_idr_lock);
2161 mutex_destroy(&thermal_list_lock);
Zhang Rui80a26a52013-03-26 16:38:29 +08002162 mutex_destroy(&thermal_governor_lock);
Zhang Rui203d3d42008-01-17 15:51:08 +08002163}
2164
R.Durgadoss4cb18722010-10-27 03:33:29 +05302165fs_initcall(thermal_init);
Zhang Rui203d3d42008-01-17 15:51:08 +08002166module_exit(thermal_exit);