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