Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
/*
 * sysfs.c sysfs ABI access functions for TMON program
 *
 * Copyright (C) 2013 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 or later as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Author: Jacob Pan <jacob.jun.pan@linux.intel.com>
 *
 */
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <dirent.h>
#include <libintl.h>
#include <ctype.h>
#include <time.h>
#include <syslog.h>
#include <sys/time.h>
#include <errno.h>

#include "tmon.h"

struct tmon_platform_data ptdata;
const char *trip_type_name[] = {
	"critical",
	"hot",
	"passive",
	"active",
};

int sysfs_set_ulong(char *path, char *filename, unsigned long val)
{
	FILE *fd;
	int ret = -1;
	char filepath[256];

	snprintf(filepath, 256, "%s/%s", path, filename);

	fd = fopen(filepath, "w");
	if (!fd) {
		syslog(LOG_ERR, "Err: open %s: %s\n", __func__, filepath);
		return ret;
	}
	ret = fprintf(fd, "%lu", val);
	fclose(fd);

	return 0;
}

/* history of thermal data, used for control algo */
#define NR_THERMAL_RECORDS 3
struct thermal_data_record trec[NR_THERMAL_RECORDS];
int cur_thermal_record; /* index to the trec array */

static int sysfs_get_ulong(char *path, char *filename, unsigned long *p_ulong)
{
	FILE *fd;
	int ret = -1;
	char filepath[256];

	snprintf(filepath, 256, "%s/%s", path, filename);

	fd = fopen(filepath, "r");
	if (!fd) {
		syslog(LOG_ERR, "Err: open %s: %s\n", __func__, filepath);
		return ret;
	}
	ret = fscanf(fd, "%lu", p_ulong);
	fclose(fd);

	return 0;
}

static int sysfs_get_string(char *path, char *filename, char *str)
{
	FILE *fd;
	int ret = -1;
	char filepath[256];

	snprintf(filepath, 256, "%s/%s", path, filename);

	fd = fopen(filepath, "r");
	if (!fd) {
		syslog(LOG_ERR, "Err: open %s: %s\n", __func__, filepath);
		return ret;
	}
	ret = fscanf(fd, "%256s", str);
	fclose(fd);

	return ret;
}

/* get states of the cooling device instance */
static int probe_cdev(struct cdev_info *cdi, char *path)
{
	sysfs_get_string(path, "type", cdi->type);
	sysfs_get_ulong(path, "max_state",  &cdi->max_state);
	sysfs_get_ulong(path, "cur_state", &cdi->cur_state);

	syslog(LOG_INFO, "%s: %s: type %s, max %lu, curr %lu inst %d\n",
		__func__, path,
		cdi->type, cdi->max_state, cdi->cur_state, cdi->instance);

	return 0;
}

static int str_to_trip_type(char *name)
{
	int i;

	for (i = 0; i < NR_THERMAL_TRIP_TYPE; i++) {
		if (!strcmp(name, trip_type_name[i]))
			return i;
	}

	return -ENOENT;
}

/* scan and fill in trip point info for a thermal zone and trip point id */
static int get_trip_point_data(char *tz_path, int tzid, int tpid)
{
	char filename[256];
	char temp_str[256];
	int trip_type;

	if (tpid >= MAX_NR_TRIP)
		return -EINVAL;
	/* check trip point type */
	snprintf(filename, sizeof(filename), "trip_point_%d_type", tpid);
	sysfs_get_string(tz_path, filename, temp_str);
	trip_type = str_to_trip_type(temp_str);
	if (trip_type < 0) {
		syslog(LOG_ERR, "%s:%s no matching type\n", __func__, temp_str);
		return -ENOENT;
	}
	ptdata.tzi[tzid].tp[tpid].type = trip_type;
	syslog(LOG_INFO, "%s:tz:%d tp:%d:type:%s type id %d\n", __func__, tzid,
		tpid, temp_str, trip_type);

	/* TODO: check attribute */

	return 0;
}

/* return instance id for file format such as trip_point_4_temp */
static int get_instance_id(char *name, int pos, int skip)
{
	char *ch;
	int i = 0;

	ch = strtok(name, "_");
	while (ch != NULL) {
		++i;
		syslog(LOG_INFO, "%s:%s:%s:%d", __func__, name, ch, i);
		ch = strtok(NULL, "_");
		if (pos == i)
			return atol(ch + skip);
	}

	return -1;
}

/* Find trip point info of a thermal zone */
static int find_tzone_tp(char *tz_name, char *d_name, struct tz_info *tzi,
			int tz_id)
{
	int tp_id;
	unsigned long temp_ulong;

	if (strstr(d_name, "trip_point") &&
		strstr(d_name, "temp")) {
		/* check if trip point temp is non-zero
		 * ignore 0/invalid trip points
		 */
		sysfs_get_ulong(tz_name, d_name, &temp_ulong);
		if (temp_ulong < MAX_TEMP_KC) {
			tzi->nr_trip_pts++;
			/* found a valid trip point */
			tp_id = get_instance_id(d_name, 2, 0);
			syslog(LOG_DEBUG, "tzone %s trip %d temp %lu tpnode %s",
				tz_name, tp_id, temp_ulong, d_name);
			if (tp_id < 0 || tp_id >= MAX_NR_TRIP) {
				syslog(LOG_ERR, "Failed to find TP inst %s\n",
					d_name);
				return -1;
			}
			get_trip_point_data(tz_name, tz_id, tp_id);
			tzi->tp[tp_id].temp = temp_ulong;
		}
	}

	return 0;
}

/* check cooling devices for binding info. */
static int find_tzone_cdev(struct dirent *nl, char *tz_name,
			struct tz_info *tzi, int tz_id, int cid)
{
	unsigned long trip_instance = 0;
	char cdev_name_linked[256];
	char cdev_name[256];
	char cdev_trip_name[256];
	int cdev_id;

	if (nl->d_type == DT_LNK) {
		syslog(LOG_DEBUG, "TZ%d: cdev: %s cid %d\n", tz_id, nl->d_name,
			cid);
		tzi->nr_cdev++;
		if (tzi->nr_cdev > ptdata.nr_cooling_dev) {
			syslog(LOG_ERR, "Err: Too many cdev? %d\n",
				tzi->nr_cdev);
			return -EINVAL;
		}
		/* find the link to real cooling device record binding */
		snprintf(cdev_name, 256, "%s/%s", tz_name, nl->d_name);
		memset(cdev_name_linked, 0, sizeof(cdev_name_linked));
		if (readlink(cdev_name, cdev_name_linked,
				sizeof(cdev_name_linked) - 1) != -1) {
			cdev_id = get_instance_id(cdev_name_linked, 1,
						sizeof("device") - 1);
			syslog(LOG_DEBUG, "cdev %s linked to %s : %d\n",
				cdev_name, cdev_name_linked, cdev_id);
			tzi->cdev_binding |= (1 << cdev_id);

			/* find the trip point in which the cdev is binded to
			 * in this tzone
			 */
			snprintf(cdev_trip_name, 256, "%s%s", nl->d_name,
				"_trip_point");
			sysfs_get_ulong(tz_name, cdev_trip_name,
					&trip_instance);
			/* validate trip point range, e.g. trip could return -1
			 * when passive is enabled
			 */
			if (trip_instance > MAX_NR_TRIP)
				trip_instance = 0;
			tzi->trip_binding[cdev_id] |= 1 << trip_instance;
			syslog(LOG_DEBUG, "cdev %s -> trip:%lu: 0x%lx %d\n",
				cdev_name, trip_instance,
				tzi->trip_binding[cdev_id],
				cdev_id);


		}
		return 0;
	}

	return -ENODEV;
}



/*****************************************************************************
 * Before calling scan_tzones, thermal sysfs must be probed to determine
 * the number of thermal zones and cooling devices.
 * We loop through each thermal zone and fill in tz_info struct, i.e.
 * ptdata.tzi[]
root@jacob-chiefriver:~# tree -d /sys/class/thermal/thermal_zone0
/sys/class/thermal/thermal_zone0
|-- cdev0 -> ../cooling_device4
|-- cdev1 -> ../cooling_device3
|-- cdev10 -> ../cooling_device7
|-- cdev11 -> ../cooling_device6
|-- cdev12 -> ../cooling_device5
|-- cdev2 -> ../cooling_device2
|-- cdev3 -> ../cooling_device1
|-- cdev4 -> ../cooling_device0
|-- cdev5 -> ../cooling_device12
|-- cdev6 -> ../cooling_device11
|-- cdev7 -> ../cooling_device10
|-- cdev8 -> ../cooling_device9
|-- cdev9 -> ../cooling_device8
|-- device -> ../../../LNXSYSTM:00/device:62/LNXTHERM:00
|-- power
`-- subsystem -> ../../../../class/thermal
*****************************************************************************/
static int scan_tzones(void)
{
	DIR *dir;
	struct dirent **namelist;
	char tz_name[256];
	int i, j, n, k = 0;

	if (!ptdata.nr_tz_sensor)
		return -1;

	for (i = 0; i <= ptdata.max_tz_instance; i++) {
		memset(tz_name, 0, sizeof(tz_name));
		snprintf(tz_name, 256, "%s/%s%d", THERMAL_SYSFS, TZONE, i);

		dir = opendir(tz_name);
		if (!dir) {
			syslog(LOG_INFO, "Thermal zone %s skipped\n", tz_name);
			continue;
		}
		/* keep track of valid tzones */
		n = scandir(tz_name, &namelist, 0, alphasort);
		if (n < 0)
			syslog(LOG_ERR, "scandir failed in %s",  tz_name);
		else {
			sysfs_get_string(tz_name, "type", ptdata.tzi[k].type);
			ptdata.tzi[k].instance = i;
			/* detect trip points and cdev attached to this tzone */
			j = 0; /* index for cdev */
			ptdata.tzi[k].nr_cdev = 0;
			ptdata.tzi[k].nr_trip_pts = 0;
			while (n--) {
				char *temp_str;

				if (find_tzone_tp(tz_name, namelist[n]->d_name,
							&ptdata.tzi[k], k))
					break;
				temp_str = strstr(namelist[n]->d_name, "cdev");
				if (!temp_str) {
					free(namelist[n]);
					continue;
				}
				if (!find_tzone_cdev(namelist[n], tz_name,
							&ptdata.tzi[k], i, j))
					j++; /* increment cdev index */
				free(namelist[n]);
			}
			free(namelist);
		}
		/*TODO: reverse trip points */
		closedir(dir);
		syslog(LOG_INFO, "TZ %d has %d cdev\n",	i,
			ptdata.tzi[k].nr_cdev);
		k++;
	}

	return 0;
}

static int scan_cdevs(void)
{
	DIR *dir;
	struct dirent **namelist;
	char cdev_name[256];
	int i, n, k = 0;

	if (!ptdata.nr_cooling_dev) {
		fprintf(stderr, "No cooling devices found\n");
		return 0;
	}
	for (i = 0; i <= ptdata.max_cdev_instance; i++) {
		memset(cdev_name, 0, sizeof(cdev_name));
		snprintf(cdev_name, 256, "%s/%s%d", THERMAL_SYSFS, CDEV, i);

		dir = opendir(cdev_name);
		if (!dir) {
			syslog(LOG_INFO, "Cooling dev %s skipped\n", cdev_name);
			/* there is a gap in cooling device id, check again
			 * for the same index.
			 */
			continue;
		}

		n = scandir(cdev_name, &namelist, 0, alphasort);
		if (n < 0)
			syslog(LOG_ERR, "scandir failed in %s",  cdev_name);
		else {
			sysfs_get_string(cdev_name, "type", ptdata.cdi[k].type);
			ptdata.cdi[k].instance = i;
			if (strstr(ptdata.cdi[k].type, ctrl_cdev)) {
				ptdata.cdi[k].flag |= CDEV_FLAG_IN_CONTROL;
				syslog(LOG_DEBUG, "control cdev id %d\n", i);
			}
			while (n--)
				free(namelist[n]);
			free(namelist);
		}
		closedir(dir);
		k++;
	}
	return 0;
}


int probe_thermal_sysfs(void)
{
	DIR *dir;
	struct dirent **namelist;
	int n;

	dir = opendir(THERMAL_SYSFS);
	if (!dir) {
		fprintf(stderr, "\nNo thermal sysfs, exit\n");
		return -1;
	}
	n = scandir(THERMAL_SYSFS, &namelist, 0, alphasort);
	if (n < 0)
		syslog(LOG_ERR, "scandir failed in thermal sysfs");
	else {
		/* detect number of thermal zones and cooling devices */
		while (n--) {
			int inst;

			if (strstr(namelist[n]->d_name, CDEV)) {
				inst = get_instance_id(namelist[n]->d_name, 1,
						sizeof("device") - 1);
				/* keep track of the max cooling device since
				 * there may be gaps.
				 */
				if (inst > ptdata.max_cdev_instance)
					ptdata.max_cdev_instance = inst;

				syslog(LOG_DEBUG, "found cdev: %s %d %d\n",
					namelist[n]->d_name,
					ptdata.nr_cooling_dev,
					ptdata.max_cdev_instance);
				ptdata.nr_cooling_dev++;
			} else if (strstr(namelist[n]->d_name, TZONE)) {
				inst = get_instance_id(namelist[n]->d_name, 1,
						sizeof("zone") - 1);
				if (inst > ptdata.max_tz_instance)
					ptdata.max_tz_instance = inst;

				syslog(LOG_DEBUG, "found tzone: %s %d %d\n",
					namelist[n]->d_name,
					ptdata.nr_tz_sensor,
					ptdata.max_tz_instance);
				ptdata.nr_tz_sensor++;
			}
			free(namelist[n]);
		}
		free(namelist);
	}
	syslog(LOG_INFO, "found %d tzone(s), %d cdev(s), target zone %d\n",
		ptdata.nr_tz_sensor, ptdata.nr_cooling_dev,
		target_thermal_zone);
	closedir(dir);

	if (!ptdata.nr_tz_sensor) {
		fprintf(stderr, "\nNo thermal zones found, exit\n\n");
		return -1;
	}

	ptdata.tzi = calloc(sizeof(struct tz_info), ptdata.max_tz_instance+1);
	if (!ptdata.tzi) {
		fprintf(stderr, "Err: allocate tz_info\n");
		return -1;
	}

	/* we still show thermal zone information if there is no cdev */
	if (ptdata.nr_cooling_dev) {
		ptdata.cdi = calloc(sizeof(struct cdev_info),
				ptdata.max_cdev_instance + 1);
		if (!ptdata.cdi) {
			free(ptdata.tzi);
			fprintf(stderr, "Err: allocate cdev_info\n");
			return -1;
		}
	}

	/* now probe tzones */
	if (scan_tzones())
		return -1;
	if (scan_cdevs())
		return -1;
	return 0;
}

/* convert sysfs zone instance to zone array index */
int zone_instance_to_index(int zone_inst)
{
	int i;

	for (i = 0; i < ptdata.nr_tz_sensor; i++)
		if (ptdata.tzi[i].instance == zone_inst)
			return i;
	return -ENOENT;
}

/* read temperature of all thermal zones */
int update_thermal_data()
{
	int i;
	char tz_name[256];
	static unsigned long samples;

	if (!ptdata.nr_tz_sensor) {
		syslog(LOG_ERR, "No thermal zones found!\n");
		return -1;
	}

	/* circular buffer for keeping historic data */
	if (cur_thermal_record >= NR_THERMAL_RECORDS)
		cur_thermal_record = 0;
	gettimeofday(&trec[cur_thermal_record].tv, NULL);
	if (tmon_log) {
		fprintf(tmon_log, "%lu ", ++samples);
		fprintf(tmon_log, "%3.1f ", p_param.t_target);
	}
	for (i = 0; i < ptdata.nr_tz_sensor; i++) {
		memset(tz_name, 0, sizeof(tz_name));
		snprintf(tz_name, 256, "%s/%s%d", THERMAL_SYSFS, TZONE,
			ptdata.tzi[i].instance);
		sysfs_get_ulong(tz_name, "temp",
				&trec[cur_thermal_record].temp[i]);
		if (tmon_log)
			fprintf(tmon_log, "%lu ",
				trec[cur_thermal_record].temp[i]/1000);
	}
	for (i = 0; i < ptdata.nr_cooling_dev; i++) {
		char cdev_name[256];
		unsigned long val;

		snprintf(cdev_name, 256, "%s/%s%d", THERMAL_SYSFS, CDEV,
			ptdata.cdi[i].instance);
		probe_cdev(&ptdata.cdi[i], cdev_name);
		val = ptdata.cdi[i].cur_state;
		if (val > 1000000)
			val = 0;
		if (tmon_log)
			fprintf(tmon_log, "%lu ", val);
	}

	if (tmon_log) {
		fprintf(tmon_log, "\n");
		fflush(tmon_log);
	}

	return 0;
}

void set_ctrl_state(unsigned long state)
{
	char ctrl_cdev_path[256];
	int i;
	unsigned long cdev_state;

	if (no_control)
		return;
	/* set all ctrl cdev to the same state */
	for (i = 0; i < ptdata.nr_cooling_dev; i++) {
		if (ptdata.cdi[i].flag & CDEV_FLAG_IN_CONTROL) {
			if (ptdata.cdi[i].max_state < 10) {
				strcpy(ctrl_cdev, "None.");
				return;
			}
			/* scale to percentage of max_state */
			cdev_state = state * ptdata.cdi[i].max_state/100;
			syslog(LOG_DEBUG,
				"ctrl cdev %d set state %lu scaled to %lu\n",
				ptdata.cdi[i].instance, state, cdev_state);
			snprintf(ctrl_cdev_path, 256, "%s/%s%d", THERMAL_SYSFS,
				CDEV, ptdata.cdi[i].instance);
			syslog(LOG_DEBUG, "ctrl cdev path %s", ctrl_cdev_path);
			sysfs_set_ulong(ctrl_cdev_path, "cur_state",
					cdev_state);
		}
	}
}

void get_ctrl_state(unsigned long *state)
{
	char ctrl_cdev_path[256];
	int ctrl_cdev_id = -1;
	int i;

	/* TODO: take average of all ctrl types. also consider change based on
	 * uevent. Take the first reading for now.
	 */
	for (i = 0; i < ptdata.nr_cooling_dev; i++) {
		if (ptdata.cdi[i].flag & CDEV_FLAG_IN_CONTROL) {
			ctrl_cdev_id = ptdata.cdi[i].instance;
			syslog(LOG_INFO, "ctrl cdev %d get state\n",
				ptdata.cdi[i].instance);
			break;
		}
	}
	if (ctrl_cdev_id == -1) {
		*state = 0;
		return;
	}
	snprintf(ctrl_cdev_path, 256, "%s/%s%d", THERMAL_SYSFS,
		CDEV, ctrl_cdev_id);
	sysfs_get_ulong(ctrl_cdev_path, "cur_state", state);
}

void free_thermal_data(void)
{
	free(ptdata.tzi);
	free(ptdata.cdi);
}