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1/*
2 *  acpi_thermal.c - ACPI Thermal Zone Driver ($Revision: 41 $)
3 *
4 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
5 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
6 *
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
8 *
9 *  This program is free software; you can redistribute it and/or modify
10 *  it under the terms of the GNU General Public License as published by
11 *  the Free Software Foundation; either version 2 of the License, or (at
12 *  your option) any later version.
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 *  This driver fully implements the ACPI thermal policy as described in the
26 *  ACPI 2.0 Specification.
27 *
28 *  TBD: 1. Implement passive cooling hysteresis.
29 *       2. Enhance passive cooling (CPU) states/limit interface to support
30 *          concepts of 'multiple limiters', upper/lower limits, etc.
31 *
32 */
33
34#include <linux/kernel.h>
35#include <linux/module.h>
36#include <linux/dmi.h>
37#include <linux/init.h>
38#include <linux/slab.h>
39#include <linux/types.h>
40#include <linux/jiffies.h>
41#include <linux/kmod.h>
42#include <linux/reboot.h>
43#include <linux/device.h>
44#include <linux/thermal.h>
45#include <linux/acpi.h>
46#include <linux/workqueue.h>
47#include <asm/uaccess.h>
48
49#define PREFIX "ACPI: "
50
51#define ACPI_THERMAL_CLASS		"thermal_zone"
52#define ACPI_THERMAL_DEVICE_NAME	"Thermal Zone"
53#define ACPI_THERMAL_NOTIFY_TEMPERATURE	0x80
54#define ACPI_THERMAL_NOTIFY_THRESHOLDS	0x81
55#define ACPI_THERMAL_NOTIFY_DEVICES	0x82
56#define ACPI_THERMAL_NOTIFY_CRITICAL	0xF0
57#define ACPI_THERMAL_NOTIFY_HOT		0xF1
58#define ACPI_THERMAL_MODE_ACTIVE	0x00
59
60#define ACPI_THERMAL_MAX_ACTIVE	10
61#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
62
63#define _COMPONENT		ACPI_THERMAL_COMPONENT
64ACPI_MODULE_NAME("thermal");
65
66MODULE_AUTHOR("Paul Diefenbaugh");
67MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
68MODULE_LICENSE("GPL");
69
70static int act;
71module_param(act, int, 0644);
72MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
73
74static int crt;
75module_param(crt, int, 0644);
76MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
77
78static int tzp;
79module_param(tzp, int, 0444);
80MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
81
82static int nocrt;
83module_param(nocrt, int, 0);
84MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
85
86static int off;
87module_param(off, int, 0);
88MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
89
90static int psv;
91module_param(psv, int, 0644);
92MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
93
94static struct workqueue_struct *acpi_thermal_pm_queue;
95
96static int acpi_thermal_add(struct acpi_device *device);
97static int acpi_thermal_remove(struct acpi_device *device);
98static void acpi_thermal_notify(struct acpi_device *device, u32 event);
99
100static const struct acpi_device_id  thermal_device_ids[] = {
101	{ACPI_THERMAL_HID, 0},
102	{"", 0},
103};
104MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
105
106#ifdef CONFIG_PM_SLEEP
107static int acpi_thermal_suspend(struct device *dev);
108static int acpi_thermal_resume(struct device *dev);
109#else
110#define acpi_thermal_suspend NULL
111#define acpi_thermal_resume NULL
112#endif
113static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, acpi_thermal_suspend, acpi_thermal_resume);
114
115static struct acpi_driver acpi_thermal_driver = {
116	.name = "thermal",
117	.class = ACPI_THERMAL_CLASS,
118	.ids = thermal_device_ids,
119	.ops = {
120		.add = acpi_thermal_add,
121		.remove = acpi_thermal_remove,
122		.notify = acpi_thermal_notify,
123		},
124	.drv.pm = &acpi_thermal_pm,
125};
126
127struct acpi_thermal_state {
128	u8 critical:1;
129	u8 hot:1;
130	u8 passive:1;
131	u8 active:1;
132	u8 reserved:4;
133	int active_index;
134};
135
136struct acpi_thermal_state_flags {
137	u8 valid:1;
138	u8 enabled:1;
139	u8 reserved:6;
140};
141
142struct acpi_thermal_critical {
143	struct acpi_thermal_state_flags flags;
144	unsigned long temperature;
145};
146
147struct acpi_thermal_hot {
148	struct acpi_thermal_state_flags flags;
149	unsigned long temperature;
150};
151
152struct acpi_thermal_passive {
153	struct acpi_thermal_state_flags flags;
154	unsigned long temperature;
155	unsigned long tc1;
156	unsigned long tc2;
157	unsigned long tsp;
158	struct acpi_handle_list devices;
159};
160
161struct acpi_thermal_active {
162	struct acpi_thermal_state_flags flags;
163	unsigned long temperature;
164	struct acpi_handle_list devices;
165};
166
167struct acpi_thermal_trips {
168	struct acpi_thermal_critical critical;
169	struct acpi_thermal_hot hot;
170	struct acpi_thermal_passive passive;
171	struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
172};
173
174struct acpi_thermal_flags {
175	u8 cooling_mode:1;	/* _SCP */
176	u8 devices:1;		/* _TZD */
177	u8 reserved:6;
178};
179
180struct acpi_thermal {
181	struct acpi_device * device;
182	acpi_bus_id name;
183	unsigned long temperature;
184	unsigned long last_temperature;
185	unsigned long polling_frequency;
186	volatile u8 zombie;
187	struct acpi_thermal_flags flags;
188	struct acpi_thermal_state state;
189	struct acpi_thermal_trips trips;
190	struct acpi_handle_list devices;
191	struct thermal_zone_device *thermal_zone;
192	int tz_enabled;
193	int kelvin_offset;
194	struct work_struct thermal_check_work;
195};
196
197/* --------------------------------------------------------------------------
198                             Thermal Zone Management
199   -------------------------------------------------------------------------- */
200
201static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
202{
203	acpi_status status = AE_OK;
204	unsigned long long tmp;
205
206	if (!tz)
207		return -EINVAL;
208
209	tz->last_temperature = tz->temperature;
210
211	status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
212	if (ACPI_FAILURE(status))
213		return -ENODEV;
214
215	tz->temperature = tmp;
216	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
217			  tz->temperature));
218
219	return 0;
220}
221
222static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
223{
224	acpi_status status = AE_OK;
225	unsigned long long tmp;
226
227	if (!tz)
228		return -EINVAL;
229
230	status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
231	if (ACPI_FAILURE(status))
232		return -ENODEV;
233
234	tz->polling_frequency = tmp;
235	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
236			  tz->polling_frequency));
237
238	return 0;
239}
240
241static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
242{
243	if (!tz)
244		return -EINVAL;
245
246	if (!acpi_has_method(tz->device->handle, "_SCP")) {
247		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
248		return -ENODEV;
249	} else if (ACPI_FAILURE(acpi_execute_simple_method(tz->device->handle,
250							   "_SCP", mode))) {
251		return -ENODEV;
252	}
253
254	return 0;
255}
256
257#define ACPI_TRIPS_CRITICAL	0x01
258#define ACPI_TRIPS_HOT		0x02
259#define ACPI_TRIPS_PASSIVE	0x04
260#define ACPI_TRIPS_ACTIVE	0x08
261#define ACPI_TRIPS_DEVICES	0x10
262
263#define ACPI_TRIPS_REFRESH_THRESHOLDS	(ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
264#define ACPI_TRIPS_REFRESH_DEVICES	ACPI_TRIPS_DEVICES
265
266#define ACPI_TRIPS_INIT      (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT |	\
267			      ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE |	\
268			      ACPI_TRIPS_DEVICES)
269
270/*
271 * This exception is thrown out in two cases:
272 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
273 *   when re-evaluating the AML code.
274 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
275 *   We need to re-bind the cooling devices of a thermal zone when this occurs.
276 */
277#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str)	\
278do {	\
279	if (flags != ACPI_TRIPS_INIT)	\
280		ACPI_EXCEPTION((AE_INFO, AE_ERROR,	\
281		"ACPI thermal trip point %s changed\n"	\
282		"Please send acpidump to linux-acpi@vger.kernel.org", str)); \
283} while (0)
284
285static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
286{
287	acpi_status status = AE_OK;
288	unsigned long long tmp;
289	struct acpi_handle_list devices;
290	int valid = 0;
291	int i;
292
293	/* Critical Shutdown */
294	if (flag & ACPI_TRIPS_CRITICAL) {
295		status = acpi_evaluate_integer(tz->device->handle,
296				"_CRT", NULL, &tmp);
297		tz->trips.critical.temperature = tmp;
298		/*
299		 * Treat freezing temperatures as invalid as well; some
300		 * BIOSes return really low values and cause reboots at startup.
301		 * Below zero (Celsius) values clearly aren't right for sure..
302		 * ... so lets discard those as invalid.
303		 */
304		if (ACPI_FAILURE(status)) {
305			tz->trips.critical.flags.valid = 0;
306			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
307					  "No critical threshold\n"));
308		} else if (tmp <= 2732) {
309			pr_warn(FW_BUG "Invalid critical threshold (%llu)\n",
310				tmp);
311			tz->trips.critical.flags.valid = 0;
312		} else {
313			tz->trips.critical.flags.valid = 1;
314			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
315					  "Found critical threshold [%lu]\n",
316					  tz->trips.critical.temperature));
317		}
318		if (tz->trips.critical.flags.valid == 1) {
319			if (crt == -1) {
320				tz->trips.critical.flags.valid = 0;
321			} else if (crt > 0) {
322				unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
323				/*
324				 * Allow override critical threshold
325				 */
326				if (crt_k > tz->trips.critical.temperature)
327					pr_warn(PREFIX "Critical threshold %d C\n",
328						crt);
329				tz->trips.critical.temperature = crt_k;
330			}
331		}
332	}
333
334	/* Critical Sleep (optional) */
335	if (flag & ACPI_TRIPS_HOT) {
336		status = acpi_evaluate_integer(tz->device->handle,
337				"_HOT", NULL, &tmp);
338		if (ACPI_FAILURE(status)) {
339			tz->trips.hot.flags.valid = 0;
340			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
341					"No hot threshold\n"));
342		} else {
343			tz->trips.hot.temperature = tmp;
344			tz->trips.hot.flags.valid = 1;
345			ACPI_DEBUG_PRINT((ACPI_DB_INFO,
346					"Found hot threshold [%lu]\n",
347					tz->trips.hot.temperature));
348		}
349	}
350
351	/* Passive (optional) */
352	if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
353		(flag == ACPI_TRIPS_INIT)) {
354		valid = tz->trips.passive.flags.valid;
355		if (psv == -1) {
356			status = AE_SUPPORT;
357		} else if (psv > 0) {
358			tmp = CELSIUS_TO_KELVIN(psv);
359			status = AE_OK;
360		} else {
361			status = acpi_evaluate_integer(tz->device->handle,
362				"_PSV", NULL, &tmp);
363		}
364
365		if (ACPI_FAILURE(status))
366			tz->trips.passive.flags.valid = 0;
367		else {
368			tz->trips.passive.temperature = tmp;
369			tz->trips.passive.flags.valid = 1;
370			if (flag == ACPI_TRIPS_INIT) {
371				status = acpi_evaluate_integer(
372						tz->device->handle, "_TC1",
373						NULL, &tmp);
374				if (ACPI_FAILURE(status))
375					tz->trips.passive.flags.valid = 0;
376				else
377					tz->trips.passive.tc1 = tmp;
378				status = acpi_evaluate_integer(
379						tz->device->handle, "_TC2",
380						NULL, &tmp);
381				if (ACPI_FAILURE(status))
382					tz->trips.passive.flags.valid = 0;
383				else
384					tz->trips.passive.tc2 = tmp;
385				status = acpi_evaluate_integer(
386						tz->device->handle, "_TSP",
387						NULL, &tmp);
388				if (ACPI_FAILURE(status))
389					tz->trips.passive.flags.valid = 0;
390				else
391					tz->trips.passive.tsp = tmp;
392			}
393		}
394	}
395	if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
396		memset(&devices, 0, sizeof(struct acpi_handle_list));
397		status = acpi_evaluate_reference(tz->device->handle, "_PSL",
398							NULL, &devices);
399		if (ACPI_FAILURE(status)) {
400			pr_warn(PREFIX "Invalid passive threshold\n");
401			tz->trips.passive.flags.valid = 0;
402		}
403		else
404			tz->trips.passive.flags.valid = 1;
405
406		if (memcmp(&tz->trips.passive.devices, &devices,
407				sizeof(struct acpi_handle_list))) {
408			memcpy(&tz->trips.passive.devices, &devices,
409				sizeof(struct acpi_handle_list));
410			ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
411		}
412	}
413	if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
414		if (valid != tz->trips.passive.flags.valid)
415				ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
416	}
417
418	/* Active (optional) */
419	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
420		char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
421		valid = tz->trips.active[i].flags.valid;
422
423		if (act == -1)
424			break; /* disable all active trip points */
425
426		if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
427			tz->trips.active[i].flags.valid)) {
428			status = acpi_evaluate_integer(tz->device->handle,
429							name, NULL, &tmp);
430			if (ACPI_FAILURE(status)) {
431				tz->trips.active[i].flags.valid = 0;
432				if (i == 0)
433					break;
434				if (act <= 0)
435					break;
436				if (i == 1)
437					tz->trips.active[0].temperature =
438						CELSIUS_TO_KELVIN(act);
439				else
440					/*
441					 * Don't allow override higher than
442					 * the next higher trip point
443					 */
444					tz->trips.active[i - 1].temperature =
445						(tz->trips.active[i - 2].temperature <
446						CELSIUS_TO_KELVIN(act) ?
447						tz->trips.active[i - 2].temperature :
448						CELSIUS_TO_KELVIN(act));
449				break;
450			} else {
451				tz->trips.active[i].temperature = tmp;
452				tz->trips.active[i].flags.valid = 1;
453			}
454		}
455
456		name[2] = 'L';
457		if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
458			memset(&devices, 0, sizeof(struct acpi_handle_list));
459			status = acpi_evaluate_reference(tz->device->handle,
460						name, NULL, &devices);
461			if (ACPI_FAILURE(status)) {
462				pr_warn(PREFIX "Invalid active%d threshold\n",
463					i);
464				tz->trips.active[i].flags.valid = 0;
465			}
466			else
467				tz->trips.active[i].flags.valid = 1;
468
469			if (memcmp(&tz->trips.active[i].devices, &devices,
470					sizeof(struct acpi_handle_list))) {
471				memcpy(&tz->trips.active[i].devices, &devices,
472					sizeof(struct acpi_handle_list));
473				ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
474			}
475		}
476		if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
477			if (valid != tz->trips.active[i].flags.valid)
478				ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
479
480		if (!tz->trips.active[i].flags.valid)
481			break;
482	}
483
484	if ((flag & ACPI_TRIPS_DEVICES)
485	    && acpi_has_method(tz->device->handle, "_TZD")) {
486		memset(&devices, 0, sizeof(devices));
487		status = acpi_evaluate_reference(tz->device->handle, "_TZD",
488						NULL, &devices);
489		if (ACPI_SUCCESS(status)
490		    && memcmp(&tz->devices, &devices, sizeof(devices))) {
491			tz->devices = devices;
492			ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
493		}
494	}
495
496	return 0;
497}
498
499static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
500{
501	int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
502
503	if (ret)
504		return ret;
505
506	valid = tz->trips.critical.flags.valid |
507		tz->trips.hot.flags.valid |
508		tz->trips.passive.flags.valid;
509
510	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
511		valid |= tz->trips.active[i].flags.valid;
512
513	if (!valid) {
514		pr_warn(FW_BUG "No valid trip found\n");
515		return -ENODEV;
516	}
517	return 0;
518}
519
520static void acpi_thermal_check(void *data)
521{
522	struct acpi_thermal *tz = data;
523
524	if (!tz->tz_enabled)
525		return;
526
527	thermal_zone_device_update(tz->thermal_zone);
528}
529
530/* sys I/F for generic thermal sysfs support */
531
532static int thermal_get_temp(struct thermal_zone_device *thermal,
533			    unsigned long *temp)
534{
535	struct acpi_thermal *tz = thermal->devdata;
536	int result;
537
538	if (!tz)
539		return -EINVAL;
540
541	result = acpi_thermal_get_temperature(tz);
542	if (result)
543		return result;
544
545	*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(tz->temperature,
546							tz->kelvin_offset);
547	return 0;
548}
549
550static int thermal_get_mode(struct thermal_zone_device *thermal,
551				enum thermal_device_mode *mode)
552{
553	struct acpi_thermal *tz = thermal->devdata;
554
555	if (!tz)
556		return -EINVAL;
557
558	*mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
559		THERMAL_DEVICE_DISABLED;
560
561	return 0;
562}
563
564static int thermal_set_mode(struct thermal_zone_device *thermal,
565				enum thermal_device_mode mode)
566{
567	struct acpi_thermal *tz = thermal->devdata;
568	int enable;
569
570	if (!tz)
571		return -EINVAL;
572
573	/*
574	 * enable/disable thermal management from ACPI thermal driver
575	 */
576	if (mode == THERMAL_DEVICE_ENABLED)
577		enable = 1;
578	else if (mode == THERMAL_DEVICE_DISABLED) {
579		enable = 0;
580		pr_warn("thermal zone will be disabled\n");
581	} else
582		return -EINVAL;
583
584	if (enable != tz->tz_enabled) {
585		tz->tz_enabled = enable;
586		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
587			"%s kernel ACPI thermal control\n",
588			tz->tz_enabled ? "Enable" : "Disable"));
589		acpi_thermal_check(tz);
590	}
591	return 0;
592}
593
594static int thermal_get_trip_type(struct thermal_zone_device *thermal,
595				 int trip, enum thermal_trip_type *type)
596{
597	struct acpi_thermal *tz = thermal->devdata;
598	int i;
599
600	if (!tz || trip < 0)
601		return -EINVAL;
602
603	if (tz->trips.critical.flags.valid) {
604		if (!trip) {
605			*type = THERMAL_TRIP_CRITICAL;
606			return 0;
607		}
608		trip--;
609	}
610
611	if (tz->trips.hot.flags.valid) {
612		if (!trip) {
613			*type = THERMAL_TRIP_HOT;
614			return 0;
615		}
616		trip--;
617	}
618
619	if (tz->trips.passive.flags.valid) {
620		if (!trip) {
621			*type = THERMAL_TRIP_PASSIVE;
622			return 0;
623		}
624		trip--;
625	}
626
627	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
628		tz->trips.active[i].flags.valid; i++) {
629		if (!trip) {
630			*type = THERMAL_TRIP_ACTIVE;
631			return 0;
632		}
633		trip--;
634	}
635
636	return -EINVAL;
637}
638
639static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
640				 int trip, unsigned long *temp)
641{
642	struct acpi_thermal *tz = thermal->devdata;
643	int i;
644
645	if (!tz || trip < 0)
646		return -EINVAL;
647
648	if (tz->trips.critical.flags.valid) {
649		if (!trip) {
650			*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
651				tz->trips.critical.temperature,
652				tz->kelvin_offset);
653			return 0;
654		}
655		trip--;
656	}
657
658	if (tz->trips.hot.flags.valid) {
659		if (!trip) {
660			*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
661				tz->trips.hot.temperature,
662				tz->kelvin_offset);
663			return 0;
664		}
665		trip--;
666	}
667
668	if (tz->trips.passive.flags.valid) {
669		if (!trip) {
670			*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
671				tz->trips.passive.temperature,
672				tz->kelvin_offset);
673			return 0;
674		}
675		trip--;
676	}
677
678	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
679		tz->trips.active[i].flags.valid; i++) {
680		if (!trip) {
681			*temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
682				tz->trips.active[i].temperature,
683				tz->kelvin_offset);
684			return 0;
685		}
686		trip--;
687	}
688
689	return -EINVAL;
690}
691
692static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
693				unsigned long *temperature) {
694	struct acpi_thermal *tz = thermal->devdata;
695
696	if (tz->trips.critical.flags.valid) {
697		*temperature = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
698				tz->trips.critical.temperature,
699				tz->kelvin_offset);
700		return 0;
701	} else
702		return -EINVAL;
703}
704
705static int thermal_get_trend(struct thermal_zone_device *thermal,
706				int trip, enum thermal_trend *trend)
707{
708	struct acpi_thermal *tz = thermal->devdata;
709	enum thermal_trip_type type;
710	int i;
711
712	if (thermal_get_trip_type(thermal, trip, &type))
713		return -EINVAL;
714
715	if (type == THERMAL_TRIP_ACTIVE) {
716		unsigned long trip_temp;
717		unsigned long temp = DECI_KELVIN_TO_MILLICELSIUS_WITH_OFFSET(
718					tz->temperature, tz->kelvin_offset);
719		if (thermal_get_trip_temp(thermal, trip, &trip_temp))
720			return -EINVAL;
721
722		if (temp > trip_temp) {
723			*trend = THERMAL_TREND_RAISING;
724			return 0;
725		} else {
726			/* Fall back on default trend */
727			return -EINVAL;
728		}
729	}
730
731	/*
732	 * tz->temperature has already been updated by generic thermal layer,
733	 * before this callback being invoked
734	 */
735	i = (tz->trips.passive.tc1 * (tz->temperature - tz->last_temperature))
736		+ (tz->trips.passive.tc2
737		* (tz->temperature - tz->trips.passive.temperature));
738
739	if (i > 0)
740		*trend = THERMAL_TREND_RAISING;
741	else if (i < 0)
742		*trend = THERMAL_TREND_DROPPING;
743	else
744		*trend = THERMAL_TREND_STABLE;
745	return 0;
746}
747
748
749static int thermal_notify(struct thermal_zone_device *thermal, int trip,
750			   enum thermal_trip_type trip_type)
751{
752	u8 type = 0;
753	struct acpi_thermal *tz = thermal->devdata;
754
755	if (trip_type == THERMAL_TRIP_CRITICAL)
756		type = ACPI_THERMAL_NOTIFY_CRITICAL;
757	else if (trip_type == THERMAL_TRIP_HOT)
758		type = ACPI_THERMAL_NOTIFY_HOT;
759	else
760		return 0;
761
762	acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
763					dev_name(&tz->device->dev), type, 1);
764
765	if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
766		return 1;
767
768	return 0;
769}
770
771static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
772					struct thermal_cooling_device *cdev,
773					bool bind)
774{
775	struct acpi_device *device = cdev->devdata;
776	struct acpi_thermal *tz = thermal->devdata;
777	struct acpi_device *dev;
778	acpi_status status;
779	acpi_handle handle;
780	int i;
781	int j;
782	int trip = -1;
783	int result = 0;
784
785	if (tz->trips.critical.flags.valid)
786		trip++;
787
788	if (tz->trips.hot.flags.valid)
789		trip++;
790
791	if (tz->trips.passive.flags.valid) {
792		trip++;
793		for (i = 0; i < tz->trips.passive.devices.count;
794		    i++) {
795			handle = tz->trips.passive.devices.handles[i];
796			status = acpi_bus_get_device(handle, &dev);
797			if (ACPI_FAILURE(status) || dev != device)
798				continue;
799			if (bind)
800				result =
801					thermal_zone_bind_cooling_device
802					(thermal, trip, cdev,
803					 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
804			else
805				result =
806					thermal_zone_unbind_cooling_device
807					(thermal, trip, cdev);
808			if (result)
809				goto failed;
810		}
811	}
812
813	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
814		if (!tz->trips.active[i].flags.valid)
815			break;
816		trip++;
817		for (j = 0;
818		    j < tz->trips.active[i].devices.count;
819		    j++) {
820			handle = tz->trips.active[i].devices.handles[j];
821			status = acpi_bus_get_device(handle, &dev);
822			if (ACPI_FAILURE(status) || dev != device)
823				continue;
824			if (bind)
825				result = thermal_zone_bind_cooling_device
826					(thermal, trip, cdev,
827					 THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
828			else
829				result = thermal_zone_unbind_cooling_device
830					(thermal, trip, cdev);
831			if (result)
832				goto failed;
833		}
834	}
835
836	for (i = 0; i < tz->devices.count; i++) {
837		handle = tz->devices.handles[i];
838		status = acpi_bus_get_device(handle, &dev);
839		if (ACPI_SUCCESS(status) && (dev == device)) {
840			if (bind)
841				result = thermal_zone_bind_cooling_device
842						(thermal, THERMAL_TRIPS_NONE,
843						 cdev, THERMAL_NO_LIMIT,
844						 THERMAL_NO_LIMIT);
845			else
846				result = thermal_zone_unbind_cooling_device
847						(thermal, THERMAL_TRIPS_NONE,
848						 cdev);
849			if (result)
850				goto failed;
851		}
852	}
853
854failed:
855	return result;
856}
857
858static int
859acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
860					struct thermal_cooling_device *cdev)
861{
862	return acpi_thermal_cooling_device_cb(thermal, cdev, true);
863}
864
865static int
866acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
867					struct thermal_cooling_device *cdev)
868{
869	return acpi_thermal_cooling_device_cb(thermal, cdev, false);
870}
871
872static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
873	.bind = acpi_thermal_bind_cooling_device,
874	.unbind	= acpi_thermal_unbind_cooling_device,
875	.get_temp = thermal_get_temp,
876	.get_mode = thermal_get_mode,
877	.set_mode = thermal_set_mode,
878	.get_trip_type = thermal_get_trip_type,
879	.get_trip_temp = thermal_get_trip_temp,
880	.get_crit_temp = thermal_get_crit_temp,
881	.get_trend = thermal_get_trend,
882	.notify = thermal_notify,
883};
884
885static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
886{
887	int trips = 0;
888	int result;
889	acpi_status status;
890	int i;
891
892	if (tz->trips.critical.flags.valid)
893		trips++;
894
895	if (tz->trips.hot.flags.valid)
896		trips++;
897
898	if (tz->trips.passive.flags.valid)
899		trips++;
900
901	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
902			tz->trips.active[i].flags.valid; i++, trips++);
903
904	if (tz->trips.passive.flags.valid)
905		tz->thermal_zone =
906			thermal_zone_device_register("acpitz", trips, 0, tz,
907						&acpi_thermal_zone_ops, NULL,
908						     tz->trips.passive.tsp*100,
909						     tz->polling_frequency*100);
910	else
911		tz->thermal_zone =
912			thermal_zone_device_register("acpitz", trips, 0, tz,
913						&acpi_thermal_zone_ops, NULL,
914						0, tz->polling_frequency*100);
915	if (IS_ERR(tz->thermal_zone))
916		return -ENODEV;
917
918	result = sysfs_create_link(&tz->device->dev.kobj,
919				   &tz->thermal_zone->device.kobj, "thermal_zone");
920	if (result)
921		return result;
922
923	result = sysfs_create_link(&tz->thermal_zone->device.kobj,
924				   &tz->device->dev.kobj, "device");
925	if (result)
926		return result;
927
928	status =  acpi_bus_attach_private_data(tz->device->handle,
929					       tz->thermal_zone);
930	if (ACPI_FAILURE(status))
931		return -ENODEV;
932
933	tz->tz_enabled = 1;
934
935	dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
936		 tz->thermal_zone->id);
937	return 0;
938}
939
940static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
941{
942	sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
943	sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
944	thermal_zone_device_unregister(tz->thermal_zone);
945	tz->thermal_zone = NULL;
946	acpi_bus_detach_private_data(tz->device->handle);
947}
948
949
950/* --------------------------------------------------------------------------
951                                 Driver Interface
952   -------------------------------------------------------------------------- */
953
954static void acpi_thermal_notify(struct acpi_device *device, u32 event)
955{
956	struct acpi_thermal *tz = acpi_driver_data(device);
957
958
959	if (!tz)
960		return;
961
962	switch (event) {
963	case ACPI_THERMAL_NOTIFY_TEMPERATURE:
964		acpi_thermal_check(tz);
965		break;
966	case ACPI_THERMAL_NOTIFY_THRESHOLDS:
967		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
968		acpi_thermal_check(tz);
969		acpi_bus_generate_netlink_event(device->pnp.device_class,
970						  dev_name(&device->dev), event, 0);
971		break;
972	case ACPI_THERMAL_NOTIFY_DEVICES:
973		acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
974		acpi_thermal_check(tz);
975		acpi_bus_generate_netlink_event(device->pnp.device_class,
976						  dev_name(&device->dev), event, 0);
977		break;
978	default:
979		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
980				  "Unsupported event [0x%x]\n", event));
981		break;
982	}
983}
984
985/*
986 * On some platforms, the AML code has dependency about
987 * the evaluating order of _TMP and _CRT/_HOT/_PSV/_ACx.
988 * 1. On HP Pavilion G4-1016tx, _TMP must be invoked after
989 *    /_CRT/_HOT/_PSV/_ACx, or else system will be power off.
990 * 2. On HP Compaq 6715b/6715s, the return value of _PSV is 0
991 *    if _TMP has never been evaluated.
992 *
993 * As this dependency is totally transparent to OS, evaluate
994 * all of them once, in the order of _CRT/_HOT/_PSV/_ACx,
995 * _TMP, before they are actually used.
996 */
997static void acpi_thermal_aml_dependency_fix(struct acpi_thermal *tz)
998{
999	acpi_handle handle = tz->device->handle;
1000	unsigned long long value;
1001	int i;
1002
1003	acpi_evaluate_integer(handle, "_CRT", NULL, &value);
1004	acpi_evaluate_integer(handle, "_HOT", NULL, &value);
1005	acpi_evaluate_integer(handle, "_PSV", NULL, &value);
1006	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1007		char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
1008		acpi_status status;
1009
1010		status = acpi_evaluate_integer(handle, name, NULL, &value);
1011		if (status == AE_NOT_FOUND)
1012			break;
1013	}
1014	acpi_evaluate_integer(handle, "_TMP", NULL, &value);
1015}
1016
1017static int acpi_thermal_get_info(struct acpi_thermal *tz)
1018{
1019	int result = 0;
1020
1021
1022	if (!tz)
1023		return -EINVAL;
1024
1025	acpi_thermal_aml_dependency_fix(tz);
1026
1027	/* Get trip points [_CRT, _PSV, etc.] (required) */
1028	result = acpi_thermal_get_trip_points(tz);
1029	if (result)
1030		return result;
1031
1032	/* Get temperature [_TMP] (required) */
1033	result = acpi_thermal_get_temperature(tz);
1034	if (result)
1035		return result;
1036
1037	/* Set the cooling mode [_SCP] to active cooling (default) */
1038	result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
1039	if (!result)
1040		tz->flags.cooling_mode = 1;
1041
1042	/* Get default polling frequency [_TZP] (optional) */
1043	if (tzp)
1044		tz->polling_frequency = tzp;
1045	else
1046		acpi_thermal_get_polling_frequency(tz);
1047
1048	return 0;
1049}
1050
1051/*
1052 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
1053 * handles temperature values with a single decimal place. As a consequence,
1054 * some implementations use an offset of 273.1 and others use an offset of
1055 * 273.2. Try to find out which one is being used, to present the most
1056 * accurate and visually appealing number.
1057 *
1058 * The heuristic below should work for all ACPI thermal zones which have a
1059 * critical trip point with a value being a multiple of 0.5 degree Celsius.
1060 */
1061static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
1062{
1063	if (tz->trips.critical.flags.valid &&
1064	    (tz->trips.critical.temperature % 5) == 1)
1065		tz->kelvin_offset = 2731;
1066	else
1067		tz->kelvin_offset = 2732;
1068}
1069
1070static void acpi_thermal_check_fn(struct work_struct *work)
1071{
1072	struct acpi_thermal *tz = container_of(work, struct acpi_thermal,
1073					       thermal_check_work);
1074	acpi_thermal_check(tz);
1075}
1076
1077static int acpi_thermal_add(struct acpi_device *device)
1078{
1079	int result = 0;
1080	struct acpi_thermal *tz = NULL;
1081
1082
1083	if (!device)
1084		return -EINVAL;
1085
1086	tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
1087	if (!tz)
1088		return -ENOMEM;
1089
1090	tz->device = device;
1091	strcpy(tz->name, device->pnp.bus_id);
1092	strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1093	strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1094	device->driver_data = tz;
1095
1096	result = acpi_thermal_get_info(tz);
1097	if (result)
1098		goto free_memory;
1099
1100	acpi_thermal_guess_offset(tz);
1101
1102	result = acpi_thermal_register_thermal_zone(tz);
1103	if (result)
1104		goto free_memory;
1105
1106	INIT_WORK(&tz->thermal_check_work, acpi_thermal_check_fn);
1107
1108	pr_info(PREFIX "%s [%s] (%ld C)\n", acpi_device_name(device),
1109		acpi_device_bid(device), KELVIN_TO_CELSIUS(tz->temperature));
1110	goto end;
1111
1112free_memory:
1113	kfree(tz);
1114end:
1115	return result;
1116}
1117
1118static int acpi_thermal_remove(struct acpi_device *device)
1119{
1120	struct acpi_thermal *tz = NULL;
1121
1122	if (!device || !acpi_driver_data(device))
1123		return -EINVAL;
1124
1125	flush_workqueue(acpi_thermal_pm_queue);
1126	tz = acpi_driver_data(device);
1127
1128	acpi_thermal_unregister_thermal_zone(tz);
1129	kfree(tz);
1130	return 0;
1131}
1132
1133#ifdef CONFIG_PM_SLEEP
1134static int acpi_thermal_suspend(struct device *dev)
1135{
1136	/* Make sure the previously queued thermal check work has been done */
1137	flush_workqueue(acpi_thermal_pm_queue);
1138	return 0;
1139}
1140
1141static int acpi_thermal_resume(struct device *dev)
1142{
1143	struct acpi_thermal *tz;
1144	int i, j, power_state, result;
1145
1146	if (!dev)
1147		return -EINVAL;
1148
1149	tz = acpi_driver_data(to_acpi_device(dev));
1150	if (!tz)
1151		return -EINVAL;
1152
1153	for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1154		if (!(&tz->trips.active[i]))
1155			break;
1156		if (!tz->trips.active[i].flags.valid)
1157			break;
1158		tz->trips.active[i].flags.enabled = 1;
1159		for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1160			result = acpi_bus_update_power(
1161					tz->trips.active[i].devices.handles[j],
1162					&power_state);
1163			if (result || (power_state != ACPI_STATE_D0)) {
1164				tz->trips.active[i].flags.enabled = 0;
1165				break;
1166			}
1167		}
1168		tz->state.active |= tz->trips.active[i].flags.enabled;
1169	}
1170
1171	queue_work(acpi_thermal_pm_queue, &tz->thermal_check_work);
1172
1173	return AE_OK;
1174}
1175#endif
1176
1177static int thermal_act(const struct dmi_system_id *d) {
1178
1179	if (act == 0) {
1180		pr_notice(PREFIX "%s detected: "
1181			  "disabling all active thermal trip points\n", d->ident);
1182		act = -1;
1183	}
1184	return 0;
1185}
1186static int thermal_nocrt(const struct dmi_system_id *d) {
1187
1188	pr_notice(PREFIX "%s detected: "
1189		  "disabling all critical thermal trip point actions.\n", d->ident);
1190	nocrt = 1;
1191	return 0;
1192}
1193static int thermal_tzp(const struct dmi_system_id *d) {
1194
1195	if (tzp == 0) {
1196		pr_notice(PREFIX "%s detected: "
1197			  "enabling thermal zone polling\n", d->ident);
1198		tzp = 300;	/* 300 dS = 30 Seconds */
1199	}
1200	return 0;
1201}
1202static int thermal_psv(const struct dmi_system_id *d) {
1203
1204	if (psv == 0) {
1205		pr_notice(PREFIX "%s detected: "
1206			  "disabling all passive thermal trip points\n", d->ident);
1207		psv = -1;
1208	}
1209	return 0;
1210}
1211
1212static struct dmi_system_id thermal_dmi_table[] __initdata = {
1213	/*
1214	 * Award BIOS on this AOpen makes thermal control almost worthless.
1215	 * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1216	 */
1217	{
1218	 .callback = thermal_act,
1219	 .ident = "AOpen i915GMm-HFS",
1220	 .matches = {
1221		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1222		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1223		},
1224	},
1225	{
1226	 .callback = thermal_psv,
1227	 .ident = "AOpen i915GMm-HFS",
1228	 .matches = {
1229		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1230		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1231		},
1232	},
1233	{
1234	 .callback = thermal_tzp,
1235	 .ident = "AOpen i915GMm-HFS",
1236	 .matches = {
1237		DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1238		DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1239		},
1240	},
1241	{
1242	 .callback = thermal_nocrt,
1243	 .ident = "Gigabyte GA-7ZX",
1244	 .matches = {
1245		DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1246		DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1247		},
1248	},
1249	{}
1250};
1251
1252static int __init acpi_thermal_init(void)
1253{
1254	int result = 0;
1255
1256	dmi_check_system(thermal_dmi_table);
1257
1258	if (off) {
1259		pr_notice(PREFIX "thermal control disabled\n");
1260		return -ENODEV;
1261	}
1262
1263	acpi_thermal_pm_queue = create_workqueue("acpi_thermal_pm");
1264	if (!acpi_thermal_pm_queue)
1265		return -ENODEV;
1266
1267	result = acpi_bus_register_driver(&acpi_thermal_driver);
1268	if (result < 0) {
1269		destroy_workqueue(acpi_thermal_pm_queue);
1270		return -ENODEV;
1271	}
1272
1273	return 0;
1274}
1275
1276static void __exit acpi_thermal_exit(void)
1277{
1278	acpi_bus_unregister_driver(&acpi_thermal_driver);
1279	destroy_workqueue(acpi_thermal_pm_queue);
1280
1281	return;
1282}
1283
1284module_init(acpi_thermal_init);
1285module_exit(acpi_thermal_exit);
1286