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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> |
63d9c273 | 34 | #include <linux/mm.h> |
4e5e4705 EV |
35 | |
36 | #include "thermal_core.h" | |
37 | ||
38 | /*** Private data structures to represent thermal device tree data ***/ | |
39 | ||
4e5e4705 EV |
40 | /** |
41 | * struct __thermal_bind_param - a match between trip and cooling device | |
42 | * @cooling_device: a pointer to identify the referred cooling device | |
43 | * @trip_id: the trip point index | |
44 | * @usage: the percentage (from 0 to 100) of cooling contribution | |
45 | * @min: minimum cooling state used at this trip point | |
46 | * @max: maximum cooling state used at this trip point | |
47 | */ | |
48 | ||
49 | struct __thermal_bind_params { | |
50 | struct device_node *cooling_device; | |
51 | unsigned int trip_id; | |
52 | unsigned int usage; | |
53 | unsigned long min; | |
54 | unsigned long max; | |
55 | }; | |
56 | ||
57 | /** | |
58 | * struct __thermal_zone - internal representation of a thermal zone | |
59 | * @mode: current thermal zone device mode (enabled/disabled) | |
60 | * @passive_delay: polling interval while passive cooling is activated | |
61 | * @polling_delay: zone polling interval | |
62 | * @ntrips: number of trip points | |
63 | * @trips: an array of trip points (0..ntrips - 1) | |
64 | * @num_tbps: number of thermal bind params | |
65 | * @tbps: an array of thermal bind params (0..num_tbps - 1) | |
66 | * @sensor_data: sensor private data used while reading temperature and trend | |
2251aef6 | 67 | * @ops: set of callbacks to handle the thermal zone based on DT |
4e5e4705 EV |
68 | */ |
69 | ||
70 | struct __thermal_zone { | |
71 | enum thermal_device_mode mode; | |
72 | int passive_delay; | |
73 | int polling_delay; | |
74 | ||
75 | /* trip data */ | |
76 | int ntrips; | |
ad9914ac | 77 | struct thermal_trip *trips; |
4e5e4705 EV |
78 | |
79 | /* cooling binding data */ | |
80 | int num_tbps; | |
81 | struct __thermal_bind_params *tbps; | |
82 | ||
83 | /* sensor interface */ | |
84 | void *sensor_data; | |
2251aef6 | 85 | const struct thermal_zone_of_device_ops *ops; |
4e5e4705 EV |
86 | }; |
87 | ||
88 | /*** DT thermal zone device callbacks ***/ | |
89 | ||
90 | static int of_thermal_get_temp(struct thermal_zone_device *tz, | |
91 | unsigned long *temp) | |
92 | { | |
93 | struct __thermal_zone *data = tz->devdata; | |
94 | ||
2251aef6 | 95 | if (!data->ops->get_temp) |
4e5e4705 EV |
96 | return -EINVAL; |
97 | ||
2251aef6 | 98 | return data->ops->get_temp(data->sensor_data, temp); |
4e5e4705 EV |
99 | } |
100 | ||
08dab66e LM |
101 | /** |
102 | * of_thermal_get_ntrips - function to export number of available trip | |
103 | * points. | |
104 | * @tz: pointer to a thermal zone | |
105 | * | |
106 | * This function is a globally visible wrapper to get number of trip points | |
107 | * stored in the local struct __thermal_zone | |
108 | * | |
109 | * Return: number of available trip points, -ENODEV when data not available | |
110 | */ | |
111 | int of_thermal_get_ntrips(struct thermal_zone_device *tz) | |
112 | { | |
113 | struct __thermal_zone *data = tz->devdata; | |
114 | ||
115 | if (!data || IS_ERR(data)) | |
116 | return -ENODEV; | |
117 | ||
118 | return data->ntrips; | |
119 | } | |
120 | EXPORT_SYMBOL_GPL(of_thermal_get_ntrips); | |
121 | ||
a9bf2cc4 LM |
122 | /** |
123 | * of_thermal_is_trip_valid - function to check if trip point is valid | |
124 | * | |
125 | * @tz: pointer to a thermal zone | |
126 | * @trip: trip point to evaluate | |
127 | * | |
128 | * This function is responsible for checking if passed trip point is valid | |
129 | * | |
130 | * Return: true if trip point is valid, false otherwise | |
131 | */ | |
132 | bool of_thermal_is_trip_valid(struct thermal_zone_device *tz, int trip) | |
133 | { | |
134 | struct __thermal_zone *data = tz->devdata; | |
135 | ||
136 | if (!data || trip >= data->ntrips || trip < 0) | |
137 | return false; | |
138 | ||
139 | return true; | |
140 | } | |
141 | EXPORT_SYMBOL_GPL(of_thermal_is_trip_valid); | |
142 | ||
ce8be778 LM |
143 | /** |
144 | * of_thermal_get_trip_points - function to get access to a globally exported | |
145 | * trip points | |
146 | * | |
147 | * @tz: pointer to a thermal zone | |
148 | * | |
149 | * This function provides a pointer to trip points table | |
150 | * | |
151 | * Return: pointer to trip points table, NULL otherwise | |
152 | */ | |
ebc3193a | 153 | const struct thermal_trip * |
ce8be778 LM |
154 | of_thermal_get_trip_points(struct thermal_zone_device *tz) |
155 | { | |
156 | struct __thermal_zone *data = tz->devdata; | |
157 | ||
158 | if (!data) | |
159 | return NULL; | |
160 | ||
161 | return data->trips; | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(of_thermal_get_trip_points); | |
164 | ||
184a4bf6 LM |
165 | /** |
166 | * of_thermal_set_emul_temp - function to set emulated temperature | |
167 | * | |
168 | * @tz: pointer to a thermal zone | |
169 | * @temp: temperature to set | |
170 | * | |
171 | * This function gives the ability to set emulated value of temperature, | |
172 | * which is handy for debugging | |
173 | * | |
174 | * Return: zero on success, error code otherwise | |
175 | */ | |
176 | static int of_thermal_set_emul_temp(struct thermal_zone_device *tz, | |
177 | unsigned long temp) | |
178 | { | |
179 | struct __thermal_zone *data = tz->devdata; | |
180 | ||
181 | if (!data->ops || !data->ops->set_emul_temp) | |
182 | return -EINVAL; | |
183 | ||
184 | return data->ops->set_emul_temp(data->sensor_data, temp); | |
185 | } | |
186 | ||
4e5e4705 EV |
187 | static int of_thermal_get_trend(struct thermal_zone_device *tz, int trip, |
188 | enum thermal_trend *trend) | |
189 | { | |
190 | struct __thermal_zone *data = tz->devdata; | |
191 | long dev_trend; | |
192 | int r; | |
193 | ||
2251aef6 | 194 | if (!data->ops->get_trend) |
4e5e4705 EV |
195 | return -EINVAL; |
196 | ||
2251aef6 | 197 | r = data->ops->get_trend(data->sensor_data, &dev_trend); |
4e5e4705 EV |
198 | if (r) |
199 | return r; | |
200 | ||
201 | /* TODO: These intervals might have some thresholds, but in core code */ | |
202 | if (dev_trend > 0) | |
203 | *trend = THERMAL_TREND_RAISING; | |
204 | else if (dev_trend < 0) | |
205 | *trend = THERMAL_TREND_DROPPING; | |
206 | else | |
207 | *trend = THERMAL_TREND_STABLE; | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static int of_thermal_bind(struct thermal_zone_device *thermal, | |
213 | struct thermal_cooling_device *cdev) | |
214 | { | |
215 | struct __thermal_zone *data = thermal->devdata; | |
216 | int i; | |
217 | ||
218 | if (!data || IS_ERR(data)) | |
219 | return -ENODEV; | |
220 | ||
221 | /* find where to bind */ | |
222 | for (i = 0; i < data->num_tbps; i++) { | |
223 | struct __thermal_bind_params *tbp = data->tbps + i; | |
224 | ||
225 | if (tbp->cooling_device == cdev->np) { | |
226 | int ret; | |
227 | ||
228 | ret = thermal_zone_bind_cooling_device(thermal, | |
229 | tbp->trip_id, cdev, | |
dd354b84 PA |
230 | tbp->max, |
231 | tbp->min); | |
4e5e4705 EV |
232 | if (ret) |
233 | return ret; | |
234 | } | |
235 | } | |
236 | ||
237 | return 0; | |
238 | } | |
239 | ||
240 | static int of_thermal_unbind(struct thermal_zone_device *thermal, | |
241 | struct thermal_cooling_device *cdev) | |
242 | { | |
243 | struct __thermal_zone *data = thermal->devdata; | |
244 | int i; | |
245 | ||
246 | if (!data || IS_ERR(data)) | |
247 | return -ENODEV; | |
248 | ||
249 | /* find where to unbind */ | |
250 | for (i = 0; i < data->num_tbps; i++) { | |
251 | struct __thermal_bind_params *tbp = data->tbps + i; | |
252 | ||
253 | if (tbp->cooling_device == cdev->np) { | |
254 | int ret; | |
255 | ||
256 | ret = thermal_zone_unbind_cooling_device(thermal, | |
257 | tbp->trip_id, cdev); | |
258 | if (ret) | |
259 | return ret; | |
260 | } | |
261 | } | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | static int of_thermal_get_mode(struct thermal_zone_device *tz, | |
267 | enum thermal_device_mode *mode) | |
268 | { | |
269 | struct __thermal_zone *data = tz->devdata; | |
270 | ||
271 | *mode = data->mode; | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int of_thermal_set_mode(struct thermal_zone_device *tz, | |
277 | enum thermal_device_mode mode) | |
278 | { | |
279 | struct __thermal_zone *data = tz->devdata; | |
280 | ||
281 | mutex_lock(&tz->lock); | |
282 | ||
283 | if (mode == THERMAL_DEVICE_ENABLED) | |
284 | tz->polling_delay = data->polling_delay; | |
285 | else | |
286 | tz->polling_delay = 0; | |
287 | ||
288 | mutex_unlock(&tz->lock); | |
289 | ||
290 | data->mode = mode; | |
291 | thermal_zone_device_update(tz); | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static int of_thermal_get_trip_type(struct thermal_zone_device *tz, int trip, | |
297 | enum thermal_trip_type *type) | |
298 | { | |
299 | struct __thermal_zone *data = tz->devdata; | |
300 | ||
301 | if (trip >= data->ntrips || trip < 0) | |
302 | return -EDOM; | |
303 | ||
304 | *type = data->trips[trip].type; | |
305 | ||
306 | return 0; | |
307 | } | |
308 | ||
309 | static int of_thermal_get_trip_temp(struct thermal_zone_device *tz, int trip, | |
310 | unsigned long *temp) | |
311 | { | |
312 | struct __thermal_zone *data = tz->devdata; | |
313 | ||
314 | if (trip >= data->ntrips || trip < 0) | |
315 | return -EDOM; | |
316 | ||
317 | *temp = data->trips[trip].temperature; | |
318 | ||
319 | return 0; | |
320 | } | |
321 | ||
322 | static int of_thermal_set_trip_temp(struct thermal_zone_device *tz, int trip, | |
323 | unsigned long temp) | |
324 | { | |
325 | struct __thermal_zone *data = tz->devdata; | |
326 | ||
327 | if (trip >= data->ntrips || trip < 0) | |
328 | return -EDOM; | |
329 | ||
330 | /* thermal framework should take care of data->mask & (1 << trip) */ | |
331 | data->trips[trip].temperature = temp; | |
332 | ||
333 | return 0; | |
334 | } | |
335 | ||
336 | static int of_thermal_get_trip_hyst(struct thermal_zone_device *tz, int trip, | |
337 | unsigned long *hyst) | |
338 | { | |
339 | struct __thermal_zone *data = tz->devdata; | |
340 | ||
341 | if (trip >= data->ntrips || trip < 0) | |
342 | return -EDOM; | |
343 | ||
344 | *hyst = data->trips[trip].hysteresis; | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | static int of_thermal_set_trip_hyst(struct thermal_zone_device *tz, int trip, | |
350 | unsigned long hyst) | |
351 | { | |
352 | struct __thermal_zone *data = tz->devdata; | |
353 | ||
354 | if (trip >= data->ntrips || trip < 0) | |
355 | return -EDOM; | |
356 | ||
357 | /* thermal framework should take care of data->mask & (1 << trip) */ | |
358 | data->trips[trip].hysteresis = hyst; | |
359 | ||
360 | return 0; | |
361 | } | |
362 | ||
363 | static int of_thermal_get_crit_temp(struct thermal_zone_device *tz, | |
364 | unsigned long *temp) | |
365 | { | |
366 | struct __thermal_zone *data = tz->devdata; | |
367 | int i; | |
368 | ||
369 | for (i = 0; i < data->ntrips; i++) | |
370 | if (data->trips[i].type == THERMAL_TRIP_CRITICAL) { | |
371 | *temp = data->trips[i].temperature; | |
372 | return 0; | |
373 | } | |
374 | ||
375 | return -EINVAL; | |
376 | } | |
377 | ||
378 | static struct thermal_zone_device_ops of_thermal_ops = { | |
379 | .get_mode = of_thermal_get_mode, | |
380 | .set_mode = of_thermal_set_mode, | |
381 | ||
382 | .get_trip_type = of_thermal_get_trip_type, | |
383 | .get_trip_temp = of_thermal_get_trip_temp, | |
384 | .set_trip_temp = of_thermal_set_trip_temp, | |
385 | .get_trip_hyst = of_thermal_get_trip_hyst, | |
386 | .set_trip_hyst = of_thermal_set_trip_hyst, | |
387 | .get_crit_temp = of_thermal_get_crit_temp, | |
388 | ||
389 | .bind = of_thermal_bind, | |
390 | .unbind = of_thermal_unbind, | |
391 | }; | |
392 | ||
393 | /*** sensor API ***/ | |
394 | ||
395 | static struct thermal_zone_device * | |
396 | thermal_zone_of_add_sensor(struct device_node *zone, | |
397 | struct device_node *sensor, void *data, | |
2251aef6 | 398 | const struct thermal_zone_of_device_ops *ops) |
4e5e4705 EV |
399 | { |
400 | struct thermal_zone_device *tzd; | |
401 | struct __thermal_zone *tz; | |
402 | ||
403 | tzd = thermal_zone_get_zone_by_name(zone->name); | |
404 | if (IS_ERR(tzd)) | |
405 | return ERR_PTR(-EPROBE_DEFER); | |
406 | ||
407 | tz = tzd->devdata; | |
408 | ||
2251aef6 EV |
409 | if (!ops) |
410 | return ERR_PTR(-EINVAL); | |
411 | ||
4e5e4705 | 412 | mutex_lock(&tzd->lock); |
2251aef6 | 413 | tz->ops = ops; |
4e5e4705 EV |
414 | tz->sensor_data = data; |
415 | ||
63d9c273 MT |
416 | pax_open_kernel(); |
417 | *(void **)&tzd->ops->get_temp = of_thermal_get_temp; | |
418 | *(void **)&tzd->ops->get_trend = of_thermal_get_trend; | |
419 | *(void **)&tzd->ops->set_emul_temp = of_thermal_set_emul_temp; | |
420 | pax_close_kernel(); | |
4e5e4705 EV |
421 | mutex_unlock(&tzd->lock); |
422 | ||
423 | return tzd; | |
424 | } | |
425 | ||
426 | /** | |
427 | * thermal_zone_of_sensor_register - registers a sensor to a DT thermal zone | |
428 | * @dev: a valid struct device pointer of a sensor device. Must contain | |
429 | * a valid .of_node, for the sensor node. | |
430 | * @sensor_id: a sensor identifier, in case the sensor IP has more | |
431 | * than one sensors | |
432 | * @data: a private pointer (owned by the caller) that will be passed | |
433 | * back, when a temperature reading is needed. | |
2251aef6 | 434 | * @ops: struct thermal_zone_of_device_ops *. Must contain at least .get_temp. |
4e5e4705 EV |
435 | * |
436 | * This function will search the list of thermal zones described in device | |
437 | * tree and look for the zone that refer to the sensor device pointed by | |
438 | * @dev->of_node as temperature providers. For the zone pointing to the | |
439 | * sensor node, the sensor will be added to the DT thermal zone device. | |
440 | * | |
441 | * The thermal zone temperature is provided by the @get_temp function | |
442 | * pointer. When called, it will have the private pointer @data back. | |
443 | * | |
444 | * The thermal zone temperature trend is provided by the @get_trend function | |
445 | * pointer. When called, it will have the private pointer @data back. | |
446 | * | |
447 | * TODO: | |
448 | * 01 - This function must enqueue the new sensor instead of using | |
449 | * it as the only source of temperature values. | |
450 | * | |
451 | * 02 - There must be a way to match the sensor with all thermal zones | |
452 | * that refer to it. | |
453 | * | |
454 | * Return: On success returns a valid struct thermal_zone_device, | |
455 | * otherwise, it returns a corresponding ERR_PTR(). Caller must | |
456 | * check the return value with help of IS_ERR() helper. | |
457 | */ | |
458 | struct thermal_zone_device * | |
2251aef6 EV |
459 | thermal_zone_of_sensor_register(struct device *dev, int sensor_id, void *data, |
460 | const struct thermal_zone_of_device_ops *ops) | |
4e5e4705 EV |
461 | { |
462 | struct device_node *np, *child, *sensor_np; | |
c2aad93c | 463 | struct thermal_zone_device *tzd = ERR_PTR(-ENODEV); |
4e5e4705 EV |
464 | |
465 | np = of_find_node_by_name(NULL, "thermal-zones"); | |
466 | if (!np) | |
467 | return ERR_PTR(-ENODEV); | |
468 | ||
c2aad93c VZ |
469 | if (!dev || !dev->of_node) { |
470 | of_node_put(np); | |
4e5e4705 | 471 | return ERR_PTR(-EINVAL); |
c2aad93c | 472 | } |
4e5e4705 | 473 | |
c2aad93c | 474 | sensor_np = of_node_get(dev->of_node); |
4e5e4705 EV |
475 | |
476 | for_each_child_of_node(np, child) { | |
477 | struct of_phandle_args sensor_specs; | |
478 | int ret, id; | |
479 | ||
a020279e LD |
480 | /* Check whether child is enabled or not */ |
481 | if (!of_device_is_available(child)) | |
482 | continue; | |
483 | ||
4e5e4705 EV |
484 | /* For now, thermal framework supports only 1 sensor per zone */ |
485 | ret = of_parse_phandle_with_args(child, "thermal-sensors", | |
486 | "#thermal-sensor-cells", | |
487 | 0, &sensor_specs); | |
488 | if (ret) | |
489 | continue; | |
490 | ||
491 | if (sensor_specs.args_count >= 1) { | |
492 | id = sensor_specs.args[0]; | |
493 | WARN(sensor_specs.args_count > 1, | |
494 | "%s: too many cells in sensor specifier %d\n", | |
495 | sensor_specs.np->name, sensor_specs.args_count); | |
496 | } else { | |
497 | id = 0; | |
498 | } | |
499 | ||
500 | if (sensor_specs.np == sensor_np && id == sensor_id) { | |
c2aad93c | 501 | tzd = thermal_zone_of_add_sensor(child, sensor_np, |
2251aef6 | 502 | data, ops); |
c2aad93c VZ |
503 | of_node_put(sensor_specs.np); |
504 | of_node_put(child); | |
505 | goto exit; | |
4e5e4705 | 506 | } |
c2aad93c | 507 | of_node_put(sensor_specs.np); |
4e5e4705 | 508 | } |
c2aad93c VZ |
509 | exit: |
510 | of_node_put(sensor_np); | |
4e5e4705 EV |
511 | of_node_put(np); |
512 | ||
c2aad93c | 513 | return tzd; |
4e5e4705 EV |
514 | } |
515 | EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_register); | |
516 | ||
517 | /** | |
518 | * thermal_zone_of_sensor_unregister - unregisters a sensor from a DT thermal zone | |
519 | * @dev: a valid struct device pointer of a sensor device. Must contain | |
520 | * a valid .of_node, for the sensor node. | |
521 | * @tzd: a pointer to struct thermal_zone_device where the sensor is registered. | |
522 | * | |
523 | * This function removes the sensor callbacks and private data from the | |
524 | * thermal zone device registered with thermal_zone_of_sensor_register() | |
525 | * API. It will also silent the zone by remove the .get_temp() and .get_trend() | |
526 | * thermal zone device callbacks. | |
527 | * | |
528 | * TODO: When the support to several sensors per zone is added, this | |
529 | * function must search the sensor list based on @dev parameter. | |
530 | * | |
531 | */ | |
532 | void thermal_zone_of_sensor_unregister(struct device *dev, | |
533 | struct thermal_zone_device *tzd) | |
534 | { | |
535 | struct __thermal_zone *tz; | |
536 | ||
537 | if (!dev || !tzd || !tzd->devdata) | |
538 | return; | |
539 | ||
540 | tz = tzd->devdata; | |
541 | ||
542 | /* no __thermal_zone, nothing to be done */ | |
543 | if (!tz) | |
544 | return; | |
545 | ||
546 | mutex_lock(&tzd->lock); | |
63d9c273 MT |
547 | pax_open_kernel(); |
548 | *(void **)&tzd->ops->get_temp = NULL; | |
549 | *(void **)&tzd->ops->get_trend = NULL; | |
550 | *(void **)&tzd->ops->set_emul_temp = NULL; | |
551 | pax_close_kernel(); | |
4e5e4705 | 552 | |
2251aef6 | 553 | tz->ops = NULL; |
4e5e4705 EV |
554 | tz->sensor_data = NULL; |
555 | mutex_unlock(&tzd->lock); | |
556 | } | |
557 | EXPORT_SYMBOL_GPL(thermal_zone_of_sensor_unregister); | |
558 | ||
559 | /*** functions parsing device tree nodes ***/ | |
560 | ||
561 | /** | |
562 | * thermal_of_populate_bind_params - parse and fill cooling map data | |
563 | * @np: DT node containing a cooling-map node | |
564 | * @__tbp: data structure to be filled with cooling map info | |
565 | * @trips: array of thermal zone trip points | |
566 | * @ntrips: number of trip points inside trips. | |
567 | * | |
568 | * This function parses a cooling-map type of node represented by | |
569 | * @np parameter and fills the read data into @__tbp data structure. | |
570 | * It needs the already parsed array of trip points of the thermal zone | |
571 | * in consideration. | |
572 | * | |
573 | * Return: 0 on success, proper error code otherwise | |
574 | */ | |
575 | static int thermal_of_populate_bind_params(struct device_node *np, | |
576 | struct __thermal_bind_params *__tbp, | |
ad9914ac | 577 | struct thermal_trip *trips, |
4e5e4705 EV |
578 | int ntrips) |
579 | { | |
580 | struct of_phandle_args cooling_spec; | |
581 | struct device_node *trip; | |
582 | int ret, i; | |
583 | u32 prop; | |
584 | ||
585 | /* Default weight. Usage is optional */ | |
586 | __tbp->usage = 0; | |
587 | ret = of_property_read_u32(np, "contribution", &prop); | |
588 | if (ret == 0) | |
589 | __tbp->usage = prop; | |
590 | ||
591 | trip = of_parse_phandle(np, "trip", 0); | |
592 | if (!trip) { | |
593 | pr_err("missing trip property\n"); | |
594 | return -ENODEV; | |
595 | } | |
596 | ||
597 | /* match using device_node */ | |
598 | for (i = 0; i < ntrips; i++) | |
599 | if (trip == trips[i].np) { | |
600 | __tbp->trip_id = i; | |
601 | break; | |
602 | } | |
603 | ||
604 | if (i == ntrips) { | |
605 | ret = -ENODEV; | |
606 | goto end; | |
607 | } | |
608 | ||
609 | ret = of_parse_phandle_with_args(np, "cooling-device", "#cooling-cells", | |
610 | 0, &cooling_spec); | |
611 | if (ret < 0) { | |
612 | pr_err("missing cooling_device property\n"); | |
613 | goto end; | |
614 | } | |
615 | __tbp->cooling_device = cooling_spec.np; | |
616 | if (cooling_spec.args_count >= 2) { /* at least min and max */ | |
617 | __tbp->min = cooling_spec.args[0]; | |
618 | __tbp->max = cooling_spec.args[1]; | |
619 | } else { | |
620 | pr_err("wrong reference to cooling device, missing limits\n"); | |
621 | } | |
622 | ||
623 | end: | |
624 | of_node_put(trip); | |
625 | ||
626 | return ret; | |
627 | } | |
628 | ||
629 | /** | |
630 | * It maps 'enum thermal_trip_type' found in include/linux/thermal.h | |
631 | * into the device tree binding of 'trip', property type. | |
632 | */ | |
633 | static const char * const trip_types[] = { | |
634 | [THERMAL_TRIP_ACTIVE] = "active", | |
635 | [THERMAL_TRIP_PASSIVE] = "passive", | |
636 | [THERMAL_TRIP_HOT] = "hot", | |
637 | [THERMAL_TRIP_CRITICAL] = "critical", | |
638 | }; | |
639 | ||
640 | /** | |
641 | * thermal_of_get_trip_type - Get phy mode for given device_node | |
642 | * @np: Pointer to the given device_node | |
643 | * @type: Pointer to resulting trip type | |
644 | * | |
645 | * The function gets trip type string from property 'type', | |
646 | * and store its index in trip_types table in @type, | |
647 | * | |
648 | * Return: 0 on success, or errno in error case. | |
649 | */ | |
650 | static int thermal_of_get_trip_type(struct device_node *np, | |
651 | enum thermal_trip_type *type) | |
652 | { | |
653 | const char *t; | |
654 | int err, i; | |
655 | ||
656 | err = of_property_read_string(np, "type", &t); | |
657 | if (err < 0) | |
658 | return err; | |
659 | ||
660 | for (i = 0; i < ARRAY_SIZE(trip_types); i++) | |
661 | if (!strcasecmp(t, trip_types[i])) { | |
662 | *type = i; | |
663 | return 0; | |
664 | } | |
665 | ||
666 | return -ENODEV; | |
667 | } | |
668 | ||
669 | /** | |
670 | * thermal_of_populate_trip - parse and fill one trip point data | |
671 | * @np: DT node containing a trip point node | |
672 | * @trip: trip point data structure to be filled up | |
673 | * | |
674 | * This function parses a trip point type of node represented by | |
675 | * @np parameter and fills the read data into @trip data structure. | |
676 | * | |
677 | * Return: 0 on success, proper error code otherwise | |
678 | */ | |
679 | static int thermal_of_populate_trip(struct device_node *np, | |
ad9914ac | 680 | struct thermal_trip *trip) |
4e5e4705 EV |
681 | { |
682 | int prop; | |
683 | int ret; | |
684 | ||
685 | ret = of_property_read_u32(np, "temperature", &prop); | |
686 | if (ret < 0) { | |
687 | pr_err("missing temperature property\n"); | |
688 | return ret; | |
689 | } | |
690 | trip->temperature = prop; | |
691 | ||
692 | ret = of_property_read_u32(np, "hysteresis", &prop); | |
693 | if (ret < 0) { | |
694 | pr_err("missing hysteresis property\n"); | |
695 | return ret; | |
696 | } | |
697 | trip->hysteresis = prop; | |
698 | ||
699 | ret = thermal_of_get_trip_type(np, &trip->type); | |
700 | if (ret < 0) { | |
701 | pr_err("wrong trip type property\n"); | |
702 | return ret; | |
703 | } | |
704 | ||
705 | /* Required for cooling map matching */ | |
706 | trip->np = np; | |
c2aad93c | 707 | of_node_get(np); |
4e5e4705 EV |
708 | |
709 | return 0; | |
710 | } | |
711 | ||
712 | /** | |
713 | * thermal_of_build_thermal_zone - parse and fill one thermal zone data | |
714 | * @np: DT node containing a thermal zone node | |
715 | * | |
716 | * This function parses a thermal zone type of node represented by | |
717 | * @np parameter and fills the read data into a __thermal_zone data structure | |
718 | * and return this pointer. | |
719 | * | |
720 | * TODO: Missing properties to parse: thermal-sensor-names and coefficients | |
721 | * | |
722 | * Return: On success returns a valid struct __thermal_zone, | |
723 | * otherwise, it returns a corresponding ERR_PTR(). Caller must | |
724 | * check the return value with help of IS_ERR() helper. | |
725 | */ | |
726 | static struct __thermal_zone * | |
727 | thermal_of_build_thermal_zone(struct device_node *np) | |
728 | { | |
729 | struct device_node *child = NULL, *gchild; | |
730 | struct __thermal_zone *tz; | |
731 | int ret, i; | |
732 | u32 prop; | |
733 | ||
734 | if (!np) { | |
735 | pr_err("no thermal zone np\n"); | |
736 | return ERR_PTR(-EINVAL); | |
737 | } | |
738 | ||
739 | tz = kzalloc(sizeof(*tz), GFP_KERNEL); | |
740 | if (!tz) | |
741 | return ERR_PTR(-ENOMEM); | |
742 | ||
743 | ret = of_property_read_u32(np, "polling-delay-passive", &prop); | |
744 | if (ret < 0) { | |
745 | pr_err("missing polling-delay-passive property\n"); | |
746 | goto free_tz; | |
747 | } | |
748 | tz->passive_delay = prop; | |
749 | ||
750 | ret = of_property_read_u32(np, "polling-delay", &prop); | |
751 | if (ret < 0) { | |
752 | pr_err("missing polling-delay property\n"); | |
753 | goto free_tz; | |
754 | } | |
755 | tz->polling_delay = prop; | |
756 | ||
757 | /* trips */ | |
758 | child = of_get_child_by_name(np, "trips"); | |
759 | ||
760 | /* No trips provided */ | |
761 | if (!child) | |
762 | goto finish; | |
763 | ||
764 | tz->ntrips = of_get_child_count(child); | |
765 | if (tz->ntrips == 0) /* must have at least one child */ | |
766 | goto finish; | |
767 | ||
768 | tz->trips = kzalloc(tz->ntrips * sizeof(*tz->trips), GFP_KERNEL); | |
769 | if (!tz->trips) { | |
770 | ret = -ENOMEM; | |
771 | goto free_tz; | |
772 | } | |
773 | ||
774 | i = 0; | |
775 | for_each_child_of_node(child, gchild) { | |
776 | ret = thermal_of_populate_trip(gchild, &tz->trips[i++]); | |
777 | if (ret) | |
778 | goto free_trips; | |
779 | } | |
780 | ||
781 | of_node_put(child); | |
782 | ||
783 | /* cooling-maps */ | |
784 | child = of_get_child_by_name(np, "cooling-maps"); | |
785 | ||
786 | /* cooling-maps not provided */ | |
787 | if (!child) | |
788 | goto finish; | |
789 | ||
790 | tz->num_tbps = of_get_child_count(child); | |
791 | if (tz->num_tbps == 0) | |
792 | goto finish; | |
793 | ||
794 | tz->tbps = kzalloc(tz->num_tbps * sizeof(*tz->tbps), GFP_KERNEL); | |
795 | if (!tz->tbps) { | |
796 | ret = -ENOMEM; | |
797 | goto free_trips; | |
798 | } | |
799 | ||
800 | i = 0; | |
ca9521b7 | 801 | for_each_child_of_node(child, gchild) { |
4e5e4705 EV |
802 | ret = thermal_of_populate_bind_params(gchild, &tz->tbps[i++], |
803 | tz->trips, tz->ntrips); | |
804 | if (ret) | |
805 | goto free_tbps; | |
ca9521b7 | 806 | } |
4e5e4705 EV |
807 | |
808 | finish: | |
809 | of_node_put(child); | |
810 | tz->mode = THERMAL_DEVICE_DISABLED; | |
811 | ||
812 | return tz; | |
813 | ||
814 | free_tbps: | |
c2aad93c VZ |
815 | for (i = 0; i < tz->num_tbps; i++) |
816 | of_node_put(tz->tbps[i].cooling_device); | |
4e5e4705 EV |
817 | kfree(tz->tbps); |
818 | free_trips: | |
c2aad93c VZ |
819 | for (i = 0; i < tz->ntrips; i++) |
820 | of_node_put(tz->trips[i].np); | |
4e5e4705 | 821 | kfree(tz->trips); |
c2aad93c | 822 | of_node_put(gchild); |
4e5e4705 EV |
823 | free_tz: |
824 | kfree(tz); | |
825 | of_node_put(child); | |
826 | ||
827 | return ERR_PTR(ret); | |
828 | } | |
829 | ||
830 | static inline void of_thermal_free_zone(struct __thermal_zone *tz) | |
831 | { | |
c2aad93c VZ |
832 | int i; |
833 | ||
834 | for (i = 0; i < tz->num_tbps; i++) | |
835 | of_node_put(tz->tbps[i].cooling_device); | |
4e5e4705 | 836 | kfree(tz->tbps); |
c2aad93c VZ |
837 | for (i = 0; i < tz->ntrips; i++) |
838 | of_node_put(tz->trips[i].np); | |
4e5e4705 EV |
839 | kfree(tz->trips); |
840 | kfree(tz); | |
841 | } | |
842 | ||
843 | /** | |
844 | * of_parse_thermal_zones - parse device tree thermal data | |
845 | * | |
846 | * Initialization function that can be called by machine initialization | |
847 | * code to parse thermal data and populate the thermal framework | |
848 | * with hardware thermal zones info. This function only parses thermal zones. | |
849 | * Cooling devices and sensor devices nodes are supposed to be parsed | |
850 | * by their respective drivers. | |
851 | * | |
852 | * Return: 0 on success, proper error code otherwise | |
853 | * | |
854 | */ | |
855 | int __init of_parse_thermal_zones(void) | |
856 | { | |
857 | struct device_node *np, *child; | |
858 | struct __thermal_zone *tz; | |
859 | struct thermal_zone_device_ops *ops; | |
860 | ||
861 | np = of_find_node_by_name(NULL, "thermal-zones"); | |
862 | if (!np) { | |
863 | pr_debug("unable to find thermal zones\n"); | |
864 | return 0; /* Run successfully on systems without thermal DT */ | |
865 | } | |
866 | ||
867 | for_each_child_of_node(np, child) { | |
868 | struct thermal_zone_device *zone; | |
869 | struct thermal_zone_params *tzp; | |
870 | ||
a020279e LD |
871 | /* Check whether child is enabled or not */ |
872 | if (!of_device_is_available(child)) | |
873 | continue; | |
874 | ||
4e5e4705 EV |
875 | tz = thermal_of_build_thermal_zone(child); |
876 | if (IS_ERR(tz)) { | |
877 | pr_err("failed to build thermal zone %s: %ld\n", | |
878 | child->name, | |
879 | PTR_ERR(tz)); | |
880 | continue; | |
881 | } | |
882 | ||
883 | ops = kmemdup(&of_thermal_ops, sizeof(*ops), GFP_KERNEL); | |
884 | if (!ops) | |
885 | goto exit_free; | |
886 | ||
887 | tzp = kzalloc(sizeof(*tzp), GFP_KERNEL); | |
888 | if (!tzp) { | |
889 | kfree(ops); | |
890 | goto exit_free; | |
891 | } | |
892 | ||
893 | /* No hwmon because there might be hwmon drivers registering */ | |
894 | tzp->no_hwmon = true; | |
895 | ||
896 | zone = thermal_zone_device_register(child->name, tz->ntrips, | |
897 | 0, tz, | |
898 | ops, tzp, | |
899 | tz->passive_delay, | |
900 | tz->polling_delay); | |
901 | if (IS_ERR(zone)) { | |
902 | pr_err("Failed to build %s zone %ld\n", child->name, | |
903 | PTR_ERR(zone)); | |
904 | kfree(tzp); | |
905 | kfree(ops); | |
906 | of_thermal_free_zone(tz); | |
907 | /* attempting to build remaining zones still */ | |
908 | } | |
909 | } | |
c2aad93c | 910 | of_node_put(np); |
4e5e4705 EV |
911 | |
912 | return 0; | |
913 | ||
914 | exit_free: | |
c2aad93c VZ |
915 | of_node_put(child); |
916 | of_node_put(np); | |
4e5e4705 EV |
917 | of_thermal_free_zone(tz); |
918 | ||
919 | /* no memory available, so free what we have built */ | |
920 | of_thermal_destroy_zones(); | |
921 | ||
922 | return -ENOMEM; | |
923 | } | |
924 | ||
925 | /** | |
926 | * of_thermal_destroy_zones - remove all zones parsed and allocated resources | |
927 | * | |
928 | * Finds all zones parsed and added to the thermal framework and remove them | |
929 | * from the system, together with their resources. | |
930 | * | |
931 | */ | |
932 | void of_thermal_destroy_zones(void) | |
933 | { | |
934 | struct device_node *np, *child; | |
935 | ||
936 | np = of_find_node_by_name(NULL, "thermal-zones"); | |
937 | if (!np) { | |
938 | pr_err("unable to find thermal zones\n"); | |
939 | return; | |
940 | } | |
941 | ||
942 | for_each_child_of_node(np, child) { | |
943 | struct thermal_zone_device *zone; | |
944 | ||
a020279e LD |
945 | /* Check whether child is enabled or not */ |
946 | if (!of_device_is_available(child)) | |
947 | continue; | |
948 | ||
4e5e4705 EV |
949 | zone = thermal_zone_get_zone_by_name(child->name); |
950 | if (IS_ERR(zone)) | |
951 | continue; | |
952 | ||
953 | thermal_zone_device_unregister(zone); | |
954 | kfree(zone->tzp); | |
955 | kfree(zone->ops); | |
956 | of_thermal_free_zone(zone->devdata); | |
957 | } | |
c2aad93c | 958 | of_node_put(np); |
4e5e4705 | 959 | } |