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