Commit | Line | Data |
---|---|---|
4e5e4705 EV |
1 | /* |
2 | * of-thermal.c - Generic Thermal Management device tree support. | |
3 | * | |
4 | * Copyright (C) 2013 Texas Instruments | |
5 | * Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.com> | |
6 | * | |
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 | #include <linux/thermal.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/of_device.h> | |
29 | #include <linux/of_platform.h> | |
30 | #include <linux/err.h> | |
31 | #include <linux/export.h> | |
32 | #include <linux/string.h> | |
2251aef6 | 33 | #include <linux/thermal.h> |
4e5e4705 EV |
34 | |
35 | #include "thermal_core.h" | |
36 | ||
37 | /*** Private data structures to represent thermal device tree data ***/ | |
38 | ||
4e5e4705 EV |
39 | /** |
40 | * struct __thermal_bind_param - a match between trip and cooling device | |
41 | * @cooling_device: a pointer to identify the referred cooling device | |
42 | * @trip_id: the trip point index | |
43 | * @usage: the percentage (from 0 to 100) of cooling contribution | |
44 | * @min: minimum cooling state used at this trip point | |
45 | * @max: maximum cooling state used at this trip point | |
46 | */ | |
47 | ||
48 | struct __thermal_bind_params { | |
49 | struct device_node *cooling_device; | |
50 | unsigned int trip_id; | |
51 | unsigned int usage; | |
52 | unsigned long min; | |
53 | unsigned long max; | |
54 | }; | |
55 | ||
56 | /** | |
57 | * struct __thermal_zone - internal representation of a thermal zone | |
58 | * @mode: current thermal zone device mode (enabled/disabled) | |
59 | * @passive_delay: polling interval while passive cooling is activated | |
60 | * @polling_delay: zone polling interval | |
a46dbae8 EV |
61 | * @slope: slope of the temperature adjustment curve |
62 | * @offset: offset of the temperature adjustment curve | |
4e5e4705 EV |
63 | * @ntrips: number of trip points |
64 | * @trips: an array of trip points (0..ntrips - 1) | |
65 | * @num_tbps: number of thermal bind params | |
66 | * @tbps: an array of thermal bind params (0..num_tbps - 1) | |
67 | * @sensor_data: sensor private data used while reading temperature and trend | |
2251aef6 | 68 | * @ops: set of callbacks to handle the thermal zone based on DT |
4e5e4705 EV |
69 | */ |
70 | ||
71 | struct __thermal_zone { | |
72 | enum thermal_device_mode mode; | |
73 | int passive_delay; | |
74 | int polling_delay; | |
a46dbae8 EV |
75 | int slope; |
76 | int offset; | |
4e5e4705 EV |
77 | |
78 | /* trip data */ | |
79 | int ntrips; | |
ad9914ac | 80 | struct thermal_trip *trips; |
4e5e4705 EV |
81 | |
82 | /* cooling binding data */ | |
83 | int num_tbps; | |
84 | struct __thermal_bind_params *tbps; | |
85 | ||
86 | /* sensor interface */ | |
87 | void *sensor_data; | |
2251aef6 | 88 | const struct thermal_zone_of_device_ops *ops; |
4e5e4705 EV |
89 | }; |
90 | ||
91 | /*** DT thermal zone device callbacks ***/ | |
92 | ||
93 | static int of_thermal_get_temp(struct thermal_zone_device *tz, | |
17e8351a | 94 | int *temp) |
4e5e4705 EV |
95 | { |
96 | struct __thermal_zone *data = tz->devdata; | |
97 | ||
2251aef6 | 98 | if (!data->ops->get_temp) |
4e5e4705 EV |
99 | return -EINVAL; |
100 | ||
2251aef6 | 101 | return data->ops->get_temp(data->sensor_data, temp); |
4e5e4705 EV |
102 | } |
103 | ||
08dab66e LM |
104 | /** |
105 | * of_thermal_get_ntrips - function to export number of available trip | |
106 | * points. | |
107 | * @tz: pointer to a thermal zone | |
108 | * | |
109 | * This function is a globally visible wrapper to get number of trip points | |
110 | * stored in the local struct __thermal_zone | |
111 | * | |
112 | * Return: number of available trip points, -ENODEV when data not available | |
113 | */ | |
114 | int of_thermal_get_ntrips(struct thermal_zone_device *tz) | |
115 | { | |
116 | struct __thermal_zone *data = tz->devdata; | |
117 | ||
118 | if (!data || IS_ERR(data)) | |
119 | return -ENODEV; | |
120 | ||
121 | return data->ntrips; | |
122 | } | |
123 | EXPORT_SYMBOL_GPL(of_thermal_get_ntrips); | |
124 | ||
a9bf2cc4 LM |
125 | /** |
126 | * of_thermal_is_trip_valid - function to check if trip point is valid | |
127 | * | |
128 | * @tz: pointer to a thermal zone | |
129 | * @trip: trip point to evaluate | |
130 | * | |
131 | * This function is responsible for checking if passed trip point is valid | |
132 | * | |
133 | * Return: true if trip point is valid, false otherwise | |
134 | */ | |
135 | bool of_thermal_is_trip_valid(struct thermal_zone_device *tz, int trip) | |
136 | { | |
137 | struct __thermal_zone *data = tz->devdata; | |
138 | ||
139 | if (!data || trip >= data->ntrips || trip < 0) | |
140 | return false; | |
141 | ||
142 | return true; | |
143 | } | |
144 | EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid); | |
145 | ||
ce8be778 LM |
146 | /** |
147 | * of_thermal_get_trip_points - function to get access to a globally exported | |
148 | * trip points | |
149 | * | |
150 | * @tz: pointer to a thermal zone | |
151 | * | |
152 | * This function provides a pointer to trip points table | |
153 | * | |
154 | * Return: pointer to trip points table, NULL otherwise | |
155 | */ | |
ebc3193a | 156 | const struct thermal_trip * |
ce8be778 LM |
157 | of_thermal_get_trip_points(struct thermal_zone_device *tz) |
158 | { | |
159 | struct __thermal_zone *data = tz->devdata; | |
160 | ||
161 | if (!data) | |
162 | return NULL; | |
163 | ||
164 | return data->trips; | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(of_thermal_get_trip_points); | |
167 | ||
184a4bf6 LM |
168 | /** |
169 | * of_thermal_set_emul_temp - function to set emulated temperature | |
170 | * | |
171 | * @tz: pointer to a thermal zone | |
172 | * @temp: temperature to set | |
173 | * | |
174 | * This function gives the ability to set emulated value of temperature, | |
175 | * which is handy for debugging | |
176 | * | |
177 | * Return: zero on success, error code otherwise | |
178 | */ | |
179 | static int of_thermal_set_emul_temp(struct thermal_zone_device *tz, | |
17e8351a | 180 | int temp) |
184a4bf6 LM |
181 | { |
182 | struct __thermal_zone *data = tz->devdata; | |
183 | ||
184 | if (!data->ops || !data->ops->set_emul_temp) | |
185 | return -EINVAL; | |
186 | ||
187 | return data->ops->set_emul_temp(data->sensor_data, temp); | |
188 | } | |
189 | ||
4e5e4705 EV |
190 | static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip, |
191 | enum thermal_trend *trend) | |
192 | { | |
193 | struct __thermal_zone *data = tz->devdata; | |
194 | long dev_trend; | |
195 | int r; | |
196 | ||
2251aef6 | 197 | if (!data->ops->get_trend) |
4e5e4705 EV |
198 | return -EINVAL; |
199 | ||
2251aef6 | 200 | r = data->ops->get_trend(data->sensor_data, &dev_trend); |
4e5e4705 EV |
201 | if (r) |
202 | return r; | |
203 | ||
204 | /* TODO: These intervals might have some thresholds, but in core code */ | |
205 | if (dev_trend > 0) | |
206 | *trend = THERMAL_TREND_RAISING; | |
207 | else if (dev_trend < 0) | |
208 | *trend = THERMAL_TREND_DROPPING; | |
209 | else | |
210 | *trend = THERMAL_TREND_STABLE; | |
211 | ||
212 | return 0; | |
213 | } | |
214 | ||
215 | static int of_thermal_bind(struct thermal_zone_device *thermal, | |
216 | struct thermal_cooling_device *cdev) | |
217 | { | |
218 | struct __thermal_zone *data = thermal->devdata; | |
219 | int i; | |
220 | ||
221 | if (!data || IS_ERR(data)) | |
222 | return -ENODEV; | |
223 | ||
224 | /* find where to bind */ | |
225 | for (i = 0; i < data->num_tbps; i++) { | |
226 | struct __thermal_bind_params *tbp = data->tbps + i; | |
227 | ||
228 | if (tbp->cooling_device == cdev->np) { | |
229 | int ret; | |
230 | ||
231 | ret = thermal_zone_bind_cooling_device(thermal, | |
232 | tbp->trip_id, cdev, | |
dd354b84 | 233 | tbp->max, |
6cd9e9f6 KS |
234 | tbp->min, |
235 | tbp->usage); | |
4e5e4705 EV |
236 | if (ret) |
237 | return ret; | |
238 | } | |
239 | } | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static int of_thermal_unbind(struct thermal_zone_device *thermal, | |
245 | struct thermal_cooling_device *cdev) | |
246 | { | |
247 | struct __thermal_zone *data = thermal->devdata; | |
248 | int i; | |
249 | ||
250 | if (!data || IS_ERR(data)) | |
251 | return -ENODEV; | |
252 | ||
253 | /* find where to unbind */ | |
254 | for (i = 0; i < data->num_tbps; i++) { | |
255 | struct __thermal_bind_params *tbp = data->tbps + i; | |
256 | ||
257 | if (tbp->cooling_device == cdev->np) { | |
258 | int ret; | |
259 | ||
260 | ret = thermal_zone_unbind_cooling_device(thermal, | |
261 | tbp->trip_id, cdev); | |
262 | if (ret) | |
263 | return ret; | |
264 | } | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | static int of_thermal_get_mode(struct thermal_zone_device *tz, | |
271 | enum thermal_device_mode *mode) | |
272 | { | |
273 | struct __thermal_zone *data = tz->devdata; | |
274 | ||
275 | *mode = data->mode; | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int of_thermal_set_mode(struct thermal_zone_device *tz, | |
281 | enum thermal_device_mode mode) | |
282 | { | |
283 | struct __thermal_zone *data = tz->devdata; | |
284 | ||
285 | mutex_lock(&tz->lock); | |
286 | ||
287 | if (mode == THERMAL_DEVICE_ENABLED) | |
288 | tz->polling_delay = data->polling_delay; | |
289 | else | |
290 | tz->polling_delay = 0; | |
291 | ||
292 | mutex_unlock(&tz->lock); | |
293 | ||
294 | data->mode = mode; | |
295 | thermal_zone_device_update(tz); | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | static int of_thermal_get_trip_type(struct thermal_zone_device *tz, int trip, | |
301 | enum thermal_trip_type *type) | |
302 | { | |
303 | struct __thermal_zone *data = tz->devdata; | |
304 | ||
305 | if (trip >= data->ntrips || trip < 0) | |
306 | return -EDOM; | |
307 | ||
308 | *type = data->trips[trip].type; | |
309 | ||
310 | return 0; | |
311 | } | |
312 | ||
313 | static int of_thermal_get_trip_temp(struct thermal_zone_device *tz, int trip, | |
17e8351a | 314 | int *temp) |
4e5e4705 EV |
315 | { |
316 | struct __thermal_zone *data = tz->devdata; | |
317 | ||
318 | if (trip >= data->ntrips || trip < 0) | |
319 | return -EDOM; | |
320 | ||
321 | *temp = data->trips[trip].temperature; | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip, | |
17e8351a | 327 | int temp) |
4e5e4705 EV |
328 | { |
329 | struct __thermal_zone *data = tz->devdata; | |
330 | ||
331 | if (trip >= data->ntrips || trip < 0) | |
332 | return -EDOM; | |
333 | ||
334 | /* thermal framework should take care of data->mask & (1 << trip) */ | |
335 | data->trips[trip].temperature = temp; | |
336 | ||
337 | return 0; | |
338 | } | |
339 | ||
340 | static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip, | |
17e8351a | 341 | int *hyst) |
4e5e4705 EV |
342 | { |
343 | struct __thermal_zone *data = tz->devdata; | |
344 | ||
345 | if (trip >= data->ntrips || trip < 0) | |
346 | return -EDOM; | |
347 | ||
348 | *hyst = data->trips[trip].hysteresis; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip, | |
17e8351a | 354 | int hyst) |
4e5e4705 EV |
355 | { |
356 | struct __thermal_zone *data = tz->devdata; | |
357 | ||
358 | if (trip >= data->ntrips || trip < 0) | |
359 | return -EDOM; | |
360 | ||
361 | /* thermal framework should take care of data->mask & (1 << trip) */ | |
362 | data->trips[trip].hysteresis = hyst; | |
363 | ||
364 | return 0; | |
365 | } | |
366 | ||
367 | static int of_thermal_get_crit_temp(struct thermal_zone_device *tz, | |
17e8351a | 368 | int *temp) |
4e5e4705 EV |
369 | { |
370 | struct __thermal_zone *data = tz->devdata; | |
371 | int i; | |
372 | ||
373 | for (i = 0; i < data->ntrips; i++) | |
374 | if (data->trips[i].type == THERMAL_TRIP_CRITICAL) { | |
375 | *temp = data->trips[i].temperature; | |
376 | return 0; | |
377 | } | |
378 | ||
379 | return -EINVAL; | |
380 | } | |
381 | ||
382 | static struct thermal_zone_device_ops of_thermal_ops = { | |
383 | .get_mode = of_thermal_get_mode, | |
384 | .set_mode = of_thermal_set_mode, | |
385 | ||
386 | .get_trip_type = of_thermal_get_trip_type, | |
387 | .get_trip_temp = of_thermal_get_trip_temp, | |
388 | .set_trip_temp = of_thermal_set_trip_temp, | |
389 | .get_trip_hyst = of_thermal_get_trip_hyst, | |
390 | .set_trip_hyst = of_thermal_set_trip_hyst, | |
391 | .get_crit_temp = of_thermal_get_crit_temp, | |
392 | ||
393 | .bind = of_thermal_bind, | |
394 | .unbind = of_thermal_unbind, | |
395 | }; | |
396 | ||
397 | /*** sensor API ***/ | |
398 | ||
399 | static struct thermal_zone_device * | |
400 | thermal_zone_of_add_sensor(struct device_node *zone, | |
401 | struct device_node *sensor, void *data, | |
2251aef6 | 402 | const struct thermal_zone_of_device_ops *ops) |
4e5e4705 EV |
403 | { |
404 | struct thermal_zone_device *tzd; | |
405 | struct __thermal_zone *tz; | |
406 | ||
407 | tzd = thermal_zone_get_zone_by_name(zone->name); | |
408 | if (IS_ERR(tzd)) | |
409 | return ERR_PTR(-EPROBE_DEFER); | |
410 | ||
411 | tz = tzd->devdata; | |
412 | ||
2251aef6 EV |
413 | if (!ops) |
414 | return ERR_PTR(-EINVAL); | |
415 | ||
4e5e4705 | 416 | mutex_lock(&tzd->lock); |
2251aef6 | 417 | tz->ops = ops; |
4e5e4705 EV |
418 | tz->sensor_data = data; |
419 | ||
420 | tzd->ops->get_temp = of_thermal_get_temp; | |
421 | tzd->ops->get_trend = of_thermal_get_trend; | |
184a4bf6 | 422 | tzd->ops->set_emul_temp = of_thermal_set_emul_temp; |
4e5e4705 EV |
423 | mutex_unlock(&tzd->lock); |
424 | ||
425 | return tzd; | |
426 | } | |
427 | ||
428 | /** | |
429 | * thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone | |
430 | * @dev: a valid struct device pointer of a sensor device. Must contain | |
431 | * a valid .of_node, for the sensor node. | |
432 | * @sensor_id: a sensor identifier, in case the sensor IP has more | |
433 | * than one sensors | |
434 | * @data: a private pointer (owned by the caller) that will be passed | |
435 | * back, when a temperature reading is needed. | |
2251aef6 | 436 | * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp. |
4e5e4705 EV |
437 | * |
438 | * This function will search the list of thermal zones described in device | |
439 | * tree and look for the zone that refer to the sensor device pointed by | |
440 | * @dev->of_node as temperature providers. For the zone pointing to the | |
441 | * sensor node, the sensor will be added to the DT thermal zone device. | |
442 | * | |
443 | * The thermal zone temperature is provided by the @get_temp function | |
444 | * pointer. When called, it will have the private pointer @data back. | |
445 | * | |
446 | * The thermal zone temperature trend is provided by the @get_trend function | |
447 | * pointer. When called, it will have the private pointer @data back. | |
448 | * | |
449 | * TODO: | |
450 | * 01 - This function must enqueue the new sensor instead of using | |
451 | * it as the only source of temperature values. | |
452 | * | |
453 | * 02 - There must be a way to match the sensor with all thermal zones | |
454 | * that refer to it. | |
455 | * | |
456 | * Return: On success returns a valid struct thermal_zone_device, | |
457 | * otherwise, it returns a corresponding ERR_PTR(). Caller must | |
458 | * check the return value with help of IS_ERR() helper. | |
459 | */ | |
460 | struct thermal_zone_device * | |
2251aef6 EV |
461 | thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data, |
462 | const struct thermal_zone_of_device_ops *ops) | |
4e5e4705 EV |
463 | { |
464 | struct device_node *np, *child, *sensor_np; | |
c2aad93c | 465 | struct thermal_zone_device *tzd = ERR_PTR(-ENODEV); |
4e5e4705 EV |
466 | |
467 | np = of_find_node_by_name(NULL, "thermal-zones"); | |
468 | if (!np) | |
469 | return ERR_PTR(-ENODEV); | |
470 | ||
c2aad93c VZ |
471 | if (!dev || !dev->of_node) { |
472 | of_node_put(np); | |
4e5e4705 | 473 | return ERR_PTR(-EINVAL); |
c2aad93c | 474 | } |
4e5e4705 | 475 | |
c2aad93c | 476 | sensor_np = of_node_get(dev->of_node); |
4e5e4705 | 477 | |
42bbe400 | 478 | for_each_available_child_of_node(np, child) { |
4e5e4705 EV |
479 | struct of_phandle_args sensor_specs; |
480 | int ret, id; | |
481 | ||
482 | /* For now, thermal framework supports only 1 sensor per zone */ | |
483 | ret = of_parse_phandle_with_args(child, "thermal-sensors", | |
484 | "#thermal-sensor-cells", | |
485 | 0, &sensor_specs); | |
486 | if (ret) | |
487 | continue; | |
488 | ||
489 | if (sensor_specs.args_count >= 1) { | |
490 | id = sensor_specs.args[0]; | |
491 | WARN(sensor_specs.args_count > 1, | |
492 | "%s: too many cells in sensor specifier %d\n", | |
493 | sensor_specs.np->name, sensor_specs.args_count); | |
494 | } else { | |
495 | id = 0; | |
496 | } | |
497 | ||
498 | if (sensor_specs.np == sensor_np && id == sensor_id) { | |
c2aad93c | 499 | tzd = thermal_zone_of_add_sensor(child, sensor_np, |
2251aef6 | 500 | data, ops); |
528012c1 LM |
501 | if (!IS_ERR(tzd)) |
502 | tzd->ops->set_mode(tzd, THERMAL_DEVICE_ENABLED); | |
503 | ||
c2aad93c VZ |
504 | of_node_put(sensor_specs.np); |
505 | of_node_put(child); | |
506 | goto exit; | |
4e5e4705 | 507 | } |
c2aad93c | 508 | of_node_put(sensor_specs.np); |
4e5e4705 | 509 | } |
c2aad93c VZ |
510 | exit: |
511 | of_node_put(sensor_np); | |
4e5e4705 EV |
512 | of_node_put(np); |
513 | ||
c2aad93c | 514 | return tzd; |
4e5e4705 EV |
515 | } |
516 | EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_register); | |
517 | ||
518 | /** | |
519 | * thermal_zone_of_sensor_unregister - unregisters a sensor from a DT thermal zone | |
520 | * @dev: a valid struct device pointer of a sensor device. Must contain | |
521 | * a valid .of_node, for the sensor node. | |
522 | * @tzd: a pointer to struct thermal_zone_device where the sensor is registered. | |
523 | * | |
524 | * This function removes the sensor callbacks and private data from the | |
525 | * thermal zone device registered with thermal_zone_of_sensor_register() | |
526 | * API. It will also silent the zone by remove the .get_temp() and .get_trend() | |
527 | * thermal zone device callbacks. | |
528 | * | |
529 | * TODO: When the support to several sensors per zone is added, this | |
530 | * function must search the sensor list based on @dev parameter. | |
531 | * | |
532 | */ | |
533 | void thermal_zone_of_sensor_unregister(struct device *dev, | |
534 | struct thermal_zone_device *tzd) | |
535 | { | |
536 | struct __thermal_zone *tz; | |
537 | ||
538 | if (!dev || !tzd || !tzd->devdata) | |
539 | return; | |
540 | ||
541 | tz = tzd->devdata; | |
542 | ||
543 | /* no __thermal_zone, nothing to be done */ | |
544 | if (!tz) | |
545 | return; | |
546 | ||
547 | mutex_lock(&tzd->lock); | |
548 | tzd->ops->get_temp = NULL; | |
549 | tzd->ops->get_trend = NULL; | |
184a4bf6 | 550 | tzd->ops->set_emul_temp = NULL; |
4e5e4705 | 551 | |
2251aef6 | 552 | tz->ops = NULL; |
4e5e4705 EV |
553 | tz->sensor_data = NULL; |
554 | mutex_unlock(&tzd->lock); | |
555 | } | |
556 | EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_unregister); | |
557 | ||
558 | /*** functions parsing device tree nodes ***/ | |
559 | ||
560 | /** | |
561 | * thermal_of_populate_bind_params - parse and fill cooling map data | |
562 | * @np: DT node containing a cooling-map node | |
563 | * @__tbp: data structure to be filled with cooling map info | |
564 | * @trips: array of thermal zone trip points | |
565 | * @ntrips: number of trip points inside trips. | |
566 | * | |
567 | * This function parses a cooling-map type of node represented by | |
568 | * @np parameter and fills the read data into @__tbp data structure. | |
569 | * It needs the already parsed array of trip points of the thermal zone | |
570 | * in consideration. | |
571 | * | |
572 | * Return: 0 on success, proper error code otherwise | |
573 | */ | |
574 | static int thermal_of_populate_bind_params(struct device_node *np, | |
575 | struct __thermal_bind_params *__tbp, | |
ad9914ac | 576 | struct thermal_trip *trips, |
4e5e4705 EV |
577 | int ntrips) |
578 | { | |
579 | struct of_phandle_args cooling_spec; | |
580 | struct device_node *trip; | |
581 | int ret, i; | |
582 | u32 prop; | |
583 | ||
584 | /* Default weight. Usage is optional */ | |
6cd9e9f6 | 585 | __tbp->usage = THERMAL_WEIGHT_DEFAULT; |
4e5e4705 EV |
586 | ret = of_property_read_u32(np, "contribution", &prop); |
587 | if (ret == 0) | |
588 | __tbp->usage = prop; | |
589 | ||
590 | trip = of_parse_phandle(np, "trip", 0); | |
591 | if (!trip) { | |
592 | pr_err("missing trip property\n"); | |
593 | return -ENODEV; | |
594 | } | |
595 | ||
596 | /* match using device_node */ | |
597 | for (i = 0; i < ntrips; i++) | |
598 | if (trip == trips[i].np) { | |
599 | __tbp->trip_id = i; | |
600 | break; | |
601 | } | |
602 | ||
603 | if (i == ntrips) { | |
604 | ret = -ENODEV; | |
605 | goto end; | |
606 | } | |
607 | ||
608 | ret = of_parse_phandle_with_args(np, "cooling-device", "#cooling-cells", | |
609 | 0, &cooling_spec); | |
610 | if (ret < 0) { | |
611 | pr_err("missing cooling_device property\n"); | |
612 | goto end; | |
613 | } | |
614 | __tbp->cooling_device = cooling_spec.np; | |
615 | if (cooling_spec.args_count >= 2) { /* at least min and max */ | |
616 | __tbp->min = cooling_spec.args[0]; | |
617 | __tbp->max = cooling_spec.args[1]; | |
618 | } else { | |
619 | pr_err("wrong reference to cooling device, missing limits\n"); | |
620 | } | |
621 | ||
622 | end: | |
623 | of_node_put(trip); | |
624 | ||
625 | return ret; | |
626 | } | |
627 | ||
628 | /** | |
629 | * It maps 'enum thermal_trip_type' found in include/linux/thermal.h | |
630 | * into the device tree binding of 'trip', property type. | |
631 | */ | |
632 | static const char * const trip_types[] = { | |
633 | [THERMAL_TRIP_ACTIVE] = "active", | |
634 | [THERMAL_TRIP_PASSIVE] = "passive", | |
635 | [THERMAL_TRIP_HOT] = "hot", | |
636 | [THERMAL_TRIP_CRITICAL] = "critical", | |
637 | }; | |
638 | ||
639 | /** | |
640 | * thermal_of_get_trip_type - Get phy mode for given device_node | |
641 | * @np: Pointer to the given device_node | |
642 | * @type: Pointer to resulting trip type | |
643 | * | |
644 | * The function gets trip type string from property 'type', | |
645 | * and store its index in trip_types table in @type, | |
646 | * | |
647 | * Return: 0 on success, or errno in error case. | |
648 | */ | |
649 | static int thermal_of_get_trip_type(struct device_node *np, | |
650 | enum thermal_trip_type *type) | |
651 | { | |
652 | const char *t; | |
653 | int err, i; | |
654 | ||
655 | err = of_property_read_string(np, "type", &t); | |
656 | if (err < 0) | |
657 | return err; | |
658 | ||
659 | for (i = 0; i < ARRAY_SIZE(trip_types); i++) | |
660 | if (!strcasecmp(t, trip_types[i])) { | |
661 | *type = i; | |
662 | return 0; | |
663 | } | |
664 | ||
665 | return -ENODEV; | |
666 | } | |
667 | ||
668 | /** | |
669 | * thermal_of_populate_trip - parse and fill one trip point data | |
670 | * @np: DT node containing a trip point node | |
671 | * @trip: trip point data structure to be filled up | |
672 | * | |
673 | * This function parses a trip point type of node represented by | |
674 | * @np parameter and fills the read data into @trip data structure. | |
675 | * | |
676 | * Return: 0 on success, proper error code otherwise | |
677 | */ | |
678 | static int thermal_of_populate_trip(struct device_node *np, | |
ad9914ac | 679 | struct thermal_trip *trip) |
4e5e4705 EV |
680 | { |
681 | int prop; | |
682 | int ret; | |
683 | ||
684 | ret = of_property_read_u32(np, "temperature", &prop); | |
685 | if (ret < 0) { | |
686 | pr_err("missing temperature property\n"); | |
687 | return ret; | |
688 | } | |
689 | trip->temperature = prop; | |
690 | ||
691 | ret = of_property_read_u32(np, "hysteresis", &prop); | |
692 | if (ret < 0) { | |
693 | pr_err("missing hysteresis property\n"); | |
694 | return ret; | |
695 | } | |
696 | trip->hysteresis = prop; | |
697 | ||
698 | ret = thermal_of_get_trip_type(np, &trip->type); | |
699 | if (ret < 0) { | |
700 | pr_err("wrong trip type property\n"); | |
701 | return ret; | |
702 | } | |
703 | ||
704 | /* Required for cooling map matching */ | |
705 | trip->np = np; | |
c2aad93c | 706 | of_node_get(np); |
4e5e4705 EV |
707 | |
708 | return 0; | |
709 | } | |
710 | ||
711 | /** | |
712 | * thermal_of_build_thermal_zone - parse and fill one thermal zone data | |
713 | * @np: DT node containing a thermal zone node | |
714 | * | |
715 | * This function parses a thermal zone type of node represented by | |
716 | * @np parameter and fills the read data into a __thermal_zone data structure | |
717 | * and return this pointer. | |
718 | * | |
a46dbae8 | 719 | * TODO: Missing properties to parse: thermal-sensor-names |
4e5e4705 EV |
720 | * |
721 | * Return: On success returns a valid struct __thermal_zone, | |
722 | * otherwise, it returns a corresponding ERR_PTR(). Caller must | |
723 | * check the return value with help of IS_ERR() helper. | |
724 | */ | |
725 | static struct __thermal_zone * | |
726 | thermal_of_build_thermal_zone(struct device_node *np) | |
727 | { | |
728 | struct device_node *child = NULL, *gchild; | |
729 | struct __thermal_zone *tz; | |
730 | int ret, i; | |
a46dbae8 | 731 | u32 prop, coef[2]; |
4e5e4705 EV |
732 | |
733 | if (!np) { | |
734 | pr_err("no thermal zone np\n"); | |
735 | return ERR_PTR(-EINVAL); | |
736 | } | |
737 | ||
738 | tz = kzalloc(sizeof(*tz), GFP_KERNEL); | |
739 | if (!tz) | |
740 | return ERR_PTR(-ENOMEM); | |
741 | ||
742 | ret = of_property_read_u32(np, "polling-delay-passive", &prop); | |
743 | if (ret < 0) { | |
744 | pr_err("missing polling-delay-passive property\n"); | |
745 | goto free_tz; | |
746 | } | |
747 | tz->passive_delay = prop; | |
748 | ||
749 | ret = of_property_read_u32(np, "polling-delay", &prop); | |
750 | if (ret < 0) { | |
751 | pr_err("missing polling-delay property\n"); | |
752 | goto free_tz; | |
753 | } | |
754 | tz->polling_delay = prop; | |
755 | ||
a46dbae8 EV |
756 | /* |
757 | * REVIST: for now, the thermal framework supports only | |
758 | * one sensor per thermal zone. Thus, we are considering | |
759 | * only the first two values as slope and offset. | |
760 | */ | |
761 | ret = of_property_read_u32_array(np, "coefficients", coef, 2); | |
762 | if (ret == 0) { | |
763 | tz->slope = coef[0]; | |
764 | tz->offset = coef[1]; | |
765 | } else { | |
766 | tz->slope = 1; | |
767 | tz->offset = 0; | |
768 | } | |
769 | ||
4e5e4705 EV |
770 | /* trips */ |
771 | child = of_get_child_by_name(np, "trips"); | |
772 | ||
773 | /* No trips provided */ | |
774 | if (!child) | |
775 | goto finish; | |
776 | ||
777 | tz->ntrips = of_get_child_count(child); | |
778 | if (tz->ntrips == 0) /* must have at least one child */ | |
779 | goto finish; | |
780 | ||
781 | tz->trips = kzalloc(tz->ntrips * sizeof(*tz->trips), GFP_KERNEL); | |
782 | if (!tz->trips) { | |
783 | ret = -ENOMEM; | |
784 | goto free_tz; | |
785 | } | |
786 | ||
787 | i = 0; | |
788 | for_each_child_of_node(child, gchild) { | |
789 | ret = thermal_of_populate_trip(gchild, &tz->trips[i++]); | |
790 | if (ret) | |
791 | goto free_trips; | |
792 | } | |
793 | ||
794 | of_node_put(child); | |
795 | ||
796 | /* cooling-maps */ | |
797 | child = of_get_child_by_name(np, "cooling-maps"); | |
798 | ||
799 | /* cooling-maps not provided */ | |
800 | if (!child) | |
801 | goto finish; | |
802 | ||
803 | tz->num_tbps = of_get_child_count(child); | |
804 | if (tz->num_tbps == 0) | |
805 | goto finish; | |
806 | ||
807 | tz->tbps = kzalloc(tz->num_tbps * sizeof(*tz->tbps), GFP_KERNEL); | |
808 | if (!tz->tbps) { | |
809 | ret = -ENOMEM; | |
810 | goto free_trips; | |
811 | } | |
812 | ||
813 | i = 0; | |
ca9521b7 | 814 | for_each_child_of_node(child, gchild) { |
4e5e4705 EV |
815 | ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++], |
816 | tz->trips, tz->ntrips); | |
817 | if (ret) | |
818 | goto free_tbps; | |
ca9521b7 | 819 | } |
4e5e4705 EV |
820 | |
821 | finish: | |
822 | of_node_put(child); | |
823 | tz->mode = THERMAL_DEVICE_DISABLED; | |
824 | ||
825 | return tz; | |
826 | ||
827 | free_tbps: | |
c2aad93c VZ |
828 | for (i = 0; i < tz->num_tbps; i++) |
829 | of_node_put(tz->tbps[i].cooling_device); | |
4e5e4705 EV |
830 | kfree(tz->tbps); |
831 | free_trips: | |
c2aad93c VZ |
832 | for (i = 0; i < tz->ntrips; i++) |
833 | of_node_put(tz->trips[i].np); | |
4e5e4705 | 834 | kfree(tz->trips); |
c2aad93c | 835 | of_node_put(gchild); |
4e5e4705 EV |
836 | free_tz: |
837 | kfree(tz); | |
838 | of_node_put(child); | |
839 | ||
840 | return ERR_PTR(ret); | |
841 | } | |
842 | ||
843 | static inline void of_thermal_free_zone(struct __thermal_zone *tz) | |
844 | { | |
c2aad93c VZ |
845 | int i; |
846 | ||
847 | for (i = 0; i < tz->num_tbps; i++) | |
848 | of_node_put(tz->tbps[i].cooling_device); | |
4e5e4705 | 849 | kfree(tz->tbps); |
c2aad93c VZ |
850 | for (i = 0; i < tz->ntrips; i++) |
851 | of_node_put(tz->trips[i].np); | |
4e5e4705 EV |
852 | kfree(tz->trips); |
853 | kfree(tz); | |
854 | } | |
855 | ||
856 | /** | |
857 | * of_parse_thermal_zones - parse device tree thermal data | |
858 | * | |
859 | * Initialization function that can be called by machine initialization | |
860 | * code to parse thermal data and populate the thermal framework | |
861 | * with hardware thermal zones info. This function only parses thermal zones. | |
862 | * Cooling devices and sensor devices nodes are supposed to be parsed | |
863 | * by their respective drivers. | |
864 | * | |
865 | * Return: 0 on success, proper error code otherwise | |
866 | * | |
867 | */ | |
868 | int __init of_parse_thermal_zones(void) | |
869 | { | |
870 | struct device_node *np, *child; | |
871 | struct __thermal_zone *tz; | |
872 | struct thermal_zone_device_ops *ops; | |
873 | ||
874 | np = of_find_node_by_name(NULL, "thermal-zones"); | |
875 | if (!np) { | |
876 | pr_debug("unable to find thermal zones\n"); | |
877 | return 0; /* Run successfully on systems without thermal DT */ | |
878 | } | |
879 | ||
42bbe400 | 880 | for_each_available_child_of_node(np, child) { |
4e5e4705 EV |
881 | struct thermal_zone_device *zone; |
882 | struct thermal_zone_params *tzp; | |
76af5495 | 883 | int i, mask = 0; |
647f9925 | 884 | u32 prop; |
4e5e4705 EV |
885 | |
886 | tz = thermal_of_build_thermal_zone(child); | |
887 | if (IS_ERR(tz)) { | |
888 | pr_err("failed to build thermal zone %s: %ld\n", | |
889 | child->name, | |
890 | PTR_ERR(tz)); | |
891 | continue; | |
892 | } | |
893 | ||
894 | ops = kmemdup(&of_thermal_ops, sizeof(*ops), GFP_KERNEL); | |
895 | if (!ops) | |
896 | goto exit_free; | |
897 | ||
898 | tzp = kzalloc(sizeof(*tzp), GFP_KERNEL); | |
899 | if (!tzp) { | |
900 | kfree(ops); | |
901 | goto exit_free; | |
902 | } | |
903 | ||
904 | /* No hwmon because there might be hwmon drivers registering */ | |
905 | tzp->no_hwmon = true; | |
906 | ||
647f9925 PA |
907 | if (!of_property_read_u32(child, "sustainable-power", &prop)) |
908 | tzp->sustainable_power = prop; | |
909 | ||
76af5495 PA |
910 | for (i = 0; i < tz->ntrips; i++) |
911 | mask |= 1 << i; | |
912 | ||
a46dbae8 EV |
913 | /* these two are left for temperature drivers to use */ |
914 | tzp->slope = tz->slope; | |
915 | tzp->offset = tz->offset; | |
916 | ||
4e5e4705 | 917 | zone = thermal_zone_device_register(child->name, tz->ntrips, |
76af5495 | 918 | mask, tz, |
4e5e4705 EV |
919 | ops, tzp, |
920 | tz->passive_delay, | |
921 | tz->polling_delay); | |
922 | if (IS_ERR(zone)) { | |
923 | pr_err("Failed to build %s zone %ld\n", child->name, | |
924 | PTR_ERR(zone)); | |
925 | kfree(tzp); | |
926 | kfree(ops); | |
927 | of_thermal_free_zone(tz); | |
928 | /* attempting to build remaining zones still */ | |
929 | } | |
930 | } | |
c2aad93c | 931 | of_node_put(np); |
4e5e4705 EV |
932 | |
933 | return 0; | |
934 | ||
935 | exit_free: | |
c2aad93c VZ |
936 | of_node_put(child); |
937 | of_node_put(np); | |
4e5e4705 EV |
938 | of_thermal_free_zone(tz); |
939 | ||
940 | /* no memory available, so free what we have built */ | |
941 | of_thermal_destroy_zones(); | |
942 | ||
943 | return -ENOMEM; | |
944 | } | |
945 | ||
946 | /** | |
947 | * of_thermal_destroy_zones - remove all zones parsed and allocated resources | |
948 | * | |
949 | * Finds all zones parsed and added to the thermal framework and remove them | |
950 | * from the system, together with their resources. | |
951 | * | |
952 | */ | |
953 | void of_thermal_destroy_zones(void) | |
954 | { | |
955 | struct device_node *np, *child; | |
956 | ||
957 | np = of_find_node_by_name(NULL, "thermal-zones"); | |
958 | if (!np) { | |
28524988 | 959 | pr_debug("unable to find thermal zones\n"); |
4e5e4705 EV |
960 | return; |
961 | } | |
962 | ||
42bbe400 | 963 | for_each_available_child_of_node(np, child) { |
4e5e4705 EV |
964 | struct thermal_zone_device *zone; |
965 | ||
966 | zone = thermal_zone_get_zone_by_name(child->name); | |
967 | if (IS_ERR(zone)) | |
968 | continue; | |
969 | ||
970 | thermal_zone_device_unregister(zone); | |
971 | kfree(zone->tzp); | |
972 | kfree(zone->ops); | |
973 | of_thermal_free_zone(zone->devdata); | |
974 | } | |
c2aad93c | 975 | of_node_put(np); |
4e5e4705 | 976 | } |