Root/drivers/acpi/thermal.c

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 <asm/uaccess.h>
45#include <linux/thermal.h>
46#include <acpi/acpi_bus.h>
47#include <acpi/acpi_drivers.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_FILE_STATE "state"
54#define ACPI_THERMAL_FILE_TEMPERATURE "temperature"
55#define ACPI_THERMAL_FILE_TRIP_POINTS "trip_points"
56#define ACPI_THERMAL_FILE_COOLING_MODE "cooling_mode"
57#define ACPI_THERMAL_FILE_POLLING_FREQ "polling_frequency"
58#define ACPI_THERMAL_NOTIFY_TEMPERATURE 0x80
59#define ACPI_THERMAL_NOTIFY_THRESHOLDS 0x81
60#define ACPI_THERMAL_NOTIFY_DEVICES 0x82
61#define ACPI_THERMAL_NOTIFY_CRITICAL 0xF0
62#define ACPI_THERMAL_NOTIFY_HOT 0xF1
63#define ACPI_THERMAL_MODE_ACTIVE 0x00
64
65#define ACPI_THERMAL_MAX_ACTIVE 10
66#define ACPI_THERMAL_MAX_LIMIT_STR_LEN 65
67
68#define _COMPONENT ACPI_THERMAL_COMPONENT
69ACPI_MODULE_NAME("thermal");
70
71MODULE_AUTHOR("Paul Diefenbaugh");
72MODULE_DESCRIPTION("ACPI Thermal Zone Driver");
73MODULE_LICENSE("GPL");
74
75static int act;
76module_param(act, int, 0644);
77MODULE_PARM_DESC(act, "Disable or override all lowest active trip points.");
78
79static int crt;
80module_param(crt, int, 0644);
81MODULE_PARM_DESC(crt, "Disable or lower all critical trip points.");
82
83static int tzp;
84module_param(tzp, int, 0444);
85MODULE_PARM_DESC(tzp, "Thermal zone polling frequency, in 1/10 seconds.");
86
87static int nocrt;
88module_param(nocrt, int, 0);
89MODULE_PARM_DESC(nocrt, "Set to take no action upon ACPI thermal zone critical trips points.");
90
91static int off;
92module_param(off, int, 0);
93MODULE_PARM_DESC(off, "Set to disable ACPI thermal support.");
94
95static int psv;
96module_param(psv, int, 0644);
97MODULE_PARM_DESC(psv, "Disable or override all passive trip points.");
98
99static int acpi_thermal_add(struct acpi_device *device);
100static int acpi_thermal_remove(struct acpi_device *device, int type);
101static void acpi_thermal_notify(struct acpi_device *device, u32 event);
102
103static const struct acpi_device_id thermal_device_ids[] = {
104    {ACPI_THERMAL_HID, 0},
105    {"", 0},
106};
107MODULE_DEVICE_TABLE(acpi, thermal_device_ids);
108
109#ifdef CONFIG_PM_SLEEP
110static int acpi_thermal_resume(struct device *dev);
111#endif
112static SIMPLE_DEV_PM_OPS(acpi_thermal_pm, NULL, acpi_thermal_resume);
113
114static struct acpi_driver acpi_thermal_driver = {
115    .name = "thermal",
116    .class = ACPI_THERMAL_CLASS,
117    .ids = thermal_device_ids,
118    .ops = {
119        .add = acpi_thermal_add,
120        .remove = acpi_thermal_remove,
121        .notify = acpi_thermal_notify,
122        },
123    .drv.pm = &acpi_thermal_pm,
124};
125
126struct acpi_thermal_state {
127    u8 critical:1;
128    u8 hot:1;
129    u8 passive:1;
130    u8 active:1;
131    u8 reserved:4;
132    int active_index;
133};
134
135struct acpi_thermal_state_flags {
136    u8 valid:1;
137    u8 enabled:1;
138    u8 reserved:6;
139};
140
141struct acpi_thermal_critical {
142    struct acpi_thermal_state_flags flags;
143    unsigned long temperature;
144};
145
146struct acpi_thermal_hot {
147    struct acpi_thermal_state_flags flags;
148    unsigned long temperature;
149};
150
151struct acpi_thermal_passive {
152    struct acpi_thermal_state_flags flags;
153    unsigned long temperature;
154    unsigned long tc1;
155    unsigned long tc2;
156    unsigned long tsp;
157    struct acpi_handle_list devices;
158};
159
160struct acpi_thermal_active {
161    struct acpi_thermal_state_flags flags;
162    unsigned long temperature;
163    struct acpi_handle_list devices;
164};
165
166struct acpi_thermal_trips {
167    struct acpi_thermal_critical critical;
168    struct acpi_thermal_hot hot;
169    struct acpi_thermal_passive passive;
170    struct acpi_thermal_active active[ACPI_THERMAL_MAX_ACTIVE];
171};
172
173struct acpi_thermal_flags {
174    u8 cooling_mode:1; /* _SCP */
175    u8 devices:1; /* _TZD */
176    u8 reserved:6;
177};
178
179struct acpi_thermal {
180    struct acpi_device * device;
181    acpi_bus_id name;
182    unsigned long temperature;
183    unsigned long last_temperature;
184    unsigned long polling_frequency;
185    volatile u8 zombie;
186    struct acpi_thermal_flags flags;
187    struct acpi_thermal_state state;
188    struct acpi_thermal_trips trips;
189    struct acpi_handle_list devices;
190    struct thermal_zone_device *thermal_zone;
191    int tz_enabled;
192    int kelvin_offset;
193    struct mutex lock;
194};
195
196/* --------------------------------------------------------------------------
197                             Thermal Zone Management
198   -------------------------------------------------------------------------- */
199
200static int acpi_thermal_get_temperature(struct acpi_thermal *tz)
201{
202    acpi_status status = AE_OK;
203    unsigned long long tmp;
204
205    if (!tz)
206        return -EINVAL;
207
208    tz->last_temperature = tz->temperature;
209
210    status = acpi_evaluate_integer(tz->device->handle, "_TMP", NULL, &tmp);
211    if (ACPI_FAILURE(status))
212        return -ENODEV;
213
214    tz->temperature = tmp;
215    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Temperature is %lu dK\n",
216              tz->temperature));
217
218    return 0;
219}
220
221static int acpi_thermal_get_polling_frequency(struct acpi_thermal *tz)
222{
223    acpi_status status = AE_OK;
224    unsigned long long tmp;
225
226    if (!tz)
227        return -EINVAL;
228
229    status = acpi_evaluate_integer(tz->device->handle, "_TZP", NULL, &tmp);
230    if (ACPI_FAILURE(status))
231        return -ENODEV;
232
233    tz->polling_frequency = tmp;
234    ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Polling frequency is %lu dS\n",
235              tz->polling_frequency));
236
237    return 0;
238}
239
240static int acpi_thermal_set_cooling_mode(struct acpi_thermal *tz, int mode)
241{
242    acpi_status status = AE_OK;
243    union acpi_object arg0 = { ACPI_TYPE_INTEGER };
244    struct acpi_object_list arg_list = { 1, &arg0 };
245    acpi_handle handle = NULL;
246
247
248    if (!tz)
249        return -EINVAL;
250
251    status = acpi_get_handle(tz->device->handle, "_SCP", &handle);
252    if (ACPI_FAILURE(status)) {
253        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "_SCP not present\n"));
254        return -ENODEV;
255    }
256
257    arg0.integer.value = mode;
258
259    status = acpi_evaluate_object(handle, NULL, &arg_list, NULL);
260    if (ACPI_FAILURE(status))
261        return -ENODEV;
262
263    return 0;
264}
265
266#define ACPI_TRIPS_CRITICAL 0x01
267#define ACPI_TRIPS_HOT 0x02
268#define ACPI_TRIPS_PASSIVE 0x04
269#define ACPI_TRIPS_ACTIVE 0x08
270#define ACPI_TRIPS_DEVICES 0x10
271
272#define ACPI_TRIPS_REFRESH_THRESHOLDS (ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE)
273#define ACPI_TRIPS_REFRESH_DEVICES ACPI_TRIPS_DEVICES
274
275#define ACPI_TRIPS_INIT (ACPI_TRIPS_CRITICAL | ACPI_TRIPS_HOT | \
276                  ACPI_TRIPS_PASSIVE | ACPI_TRIPS_ACTIVE | \
277                  ACPI_TRIPS_DEVICES)
278
279/*
280 * This exception is thrown out in two cases:
281 * 1.An invalid trip point becomes invalid or a valid trip point becomes invalid
282 * when re-evaluating the AML code.
283 * 2.TODO: Devices listed in _PSL, _ALx, _TZD may change.
284 * We need to re-bind the cooling devices of a thermal zone when this occurs.
285 */
286#define ACPI_THERMAL_TRIPS_EXCEPTION(flags, str) \
287do { \
288    if (flags != ACPI_TRIPS_INIT) \
289        ACPI_EXCEPTION((AE_INFO, AE_ERROR, \
290        "ACPI thermal trip point %s changed\n" \
291        "Please send acpidump to linux-acpi@vger.kernel.org\n", str)); \
292} while (0)
293
294static int acpi_thermal_trips_update(struct acpi_thermal *tz, int flag)
295{
296    acpi_status status = AE_OK;
297    unsigned long long tmp;
298    struct acpi_handle_list devices;
299    int valid = 0;
300    int i;
301
302    /* Critical Shutdown */
303    if (flag & ACPI_TRIPS_CRITICAL) {
304        status = acpi_evaluate_integer(tz->device->handle,
305                "_CRT", NULL, &tmp);
306        tz->trips.critical.temperature = tmp;
307        /*
308         * Treat freezing temperatures as invalid as well; some
309         * BIOSes return really low values and cause reboots at startup.
310         * Below zero (Celsius) values clearly aren't right for sure..
311         * ... so lets discard those as invalid.
312         */
313        if (ACPI_FAILURE(status)) {
314            tz->trips.critical.flags.valid = 0;
315            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
316                      "No critical threshold\n"));
317        } else if (tmp <= 2732) {
318            printk(KERN_WARNING FW_BUG "Invalid critical threshold "
319                   "(%llu)\n", tmp);
320            tz->trips.critical.flags.valid = 0;
321        } else {
322            tz->trips.critical.flags.valid = 1;
323            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
324                      "Found critical threshold [%lu]\n",
325                      tz->trips.critical.temperature));
326        }
327        if (tz->trips.critical.flags.valid == 1) {
328            if (crt == -1) {
329                tz->trips.critical.flags.valid = 0;
330            } else if (crt > 0) {
331                unsigned long crt_k = CELSIUS_TO_KELVIN(crt);
332                /*
333                 * Allow override critical threshold
334                 */
335                if (crt_k > tz->trips.critical.temperature)
336                    printk(KERN_WARNING PREFIX
337                        "Critical threshold %d C\n", crt);
338                tz->trips.critical.temperature = crt_k;
339            }
340        }
341    }
342
343    /* Critical Sleep (optional) */
344    if (flag & ACPI_TRIPS_HOT) {
345        status = acpi_evaluate_integer(tz->device->handle,
346                "_HOT", NULL, &tmp);
347        if (ACPI_FAILURE(status)) {
348            tz->trips.hot.flags.valid = 0;
349            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
350                    "No hot threshold\n"));
351        } else {
352            tz->trips.hot.temperature = tmp;
353            tz->trips.hot.flags.valid = 1;
354            ACPI_DEBUG_PRINT((ACPI_DB_INFO,
355                    "Found hot threshold [%lu]\n",
356                    tz->trips.critical.temperature));
357        }
358    }
359
360    /* Passive (optional) */
361    if (((flag & ACPI_TRIPS_PASSIVE) && tz->trips.passive.flags.valid) ||
362        (flag == ACPI_TRIPS_INIT)) {
363        valid = tz->trips.passive.flags.valid;
364        if (psv == -1) {
365            status = AE_SUPPORT;
366        } else if (psv > 0) {
367            tmp = CELSIUS_TO_KELVIN(psv);
368            status = AE_OK;
369        } else {
370            status = acpi_evaluate_integer(tz->device->handle,
371                "_PSV", NULL, &tmp);
372        }
373
374        if (ACPI_FAILURE(status))
375            tz->trips.passive.flags.valid = 0;
376        else {
377            tz->trips.passive.temperature = tmp;
378            tz->trips.passive.flags.valid = 1;
379            if (flag == ACPI_TRIPS_INIT) {
380                status = acpi_evaluate_integer(
381                        tz->device->handle, "_TC1",
382                        NULL, &tmp);
383                if (ACPI_FAILURE(status))
384                    tz->trips.passive.flags.valid = 0;
385                else
386                    tz->trips.passive.tc1 = tmp;
387                status = acpi_evaluate_integer(
388                        tz->device->handle, "_TC2",
389                        NULL, &tmp);
390                if (ACPI_FAILURE(status))
391                    tz->trips.passive.flags.valid = 0;
392                else
393                    tz->trips.passive.tc2 = tmp;
394                status = acpi_evaluate_integer(
395                        tz->device->handle, "_TSP",
396                        NULL, &tmp);
397                if (ACPI_FAILURE(status))
398                    tz->trips.passive.flags.valid = 0;
399                else
400                    tz->trips.passive.tsp = tmp;
401            }
402        }
403    }
404    if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.passive.flags.valid) {
405        memset(&devices, 0, sizeof(struct acpi_handle_list));
406        status = acpi_evaluate_reference(tz->device->handle, "_PSL",
407                            NULL, &devices);
408        if (ACPI_FAILURE(status)) {
409            printk(KERN_WARNING PREFIX
410                "Invalid passive threshold\n");
411            tz->trips.passive.flags.valid = 0;
412        }
413        else
414            tz->trips.passive.flags.valid = 1;
415
416        if (memcmp(&tz->trips.passive.devices, &devices,
417                sizeof(struct acpi_handle_list))) {
418            memcpy(&tz->trips.passive.devices, &devices,
419                sizeof(struct acpi_handle_list));
420            ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
421        }
422    }
423    if ((flag & ACPI_TRIPS_PASSIVE) || (flag & ACPI_TRIPS_DEVICES)) {
424        if (valid != tz->trips.passive.flags.valid)
425                ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
426    }
427
428    /* Active (optional) */
429    for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
430        char name[5] = { '_', 'A', 'C', ('0' + i), '\0' };
431        valid = tz->trips.active[i].flags.valid;
432
433        if (act == -1)
434            break; /* disable all active trip points */
435
436        if ((flag == ACPI_TRIPS_INIT) || ((flag & ACPI_TRIPS_ACTIVE) &&
437            tz->trips.active[i].flags.valid)) {
438            status = acpi_evaluate_integer(tz->device->handle,
439                            name, NULL, &tmp);
440            if (ACPI_FAILURE(status)) {
441                tz->trips.active[i].flags.valid = 0;
442                if (i == 0)
443                    break;
444                if (act <= 0)
445                    break;
446                if (i == 1)
447                    tz->trips.active[0].temperature =
448                        CELSIUS_TO_KELVIN(act);
449                else
450                    /*
451                     * Don't allow override higher than
452                     * the next higher trip point
453                     */
454                    tz->trips.active[i - 1].temperature =
455                        (tz->trips.active[i - 2].temperature <
456                        CELSIUS_TO_KELVIN(act) ?
457                        tz->trips.active[i - 2].temperature :
458                        CELSIUS_TO_KELVIN(act));
459                break;
460            } else {
461                tz->trips.active[i].temperature = tmp;
462                tz->trips.active[i].flags.valid = 1;
463            }
464        }
465
466        name[2] = 'L';
467        if ((flag & ACPI_TRIPS_DEVICES) && tz->trips.active[i].flags.valid ) {
468            memset(&devices, 0, sizeof(struct acpi_handle_list));
469            status = acpi_evaluate_reference(tz->device->handle,
470                        name, NULL, &devices);
471            if (ACPI_FAILURE(status)) {
472                printk(KERN_WARNING PREFIX
473                    "Invalid active%d threshold\n", i);
474                tz->trips.active[i].flags.valid = 0;
475            }
476            else
477                tz->trips.active[i].flags.valid = 1;
478
479            if (memcmp(&tz->trips.active[i].devices, &devices,
480                    sizeof(struct acpi_handle_list))) {
481                memcpy(&tz->trips.active[i].devices, &devices,
482                    sizeof(struct acpi_handle_list));
483                ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
484            }
485        }
486        if ((flag & ACPI_TRIPS_ACTIVE) || (flag & ACPI_TRIPS_DEVICES))
487            if (valid != tz->trips.active[i].flags.valid)
488                ACPI_THERMAL_TRIPS_EXCEPTION(flag, "state");
489
490        if (!tz->trips.active[i].flags.valid)
491            break;
492    }
493
494    if (flag & ACPI_TRIPS_DEVICES) {
495        memset(&devices, 0, sizeof(struct acpi_handle_list));
496        status = acpi_evaluate_reference(tz->device->handle, "_TZD",
497                        NULL, &devices);
498        if (memcmp(&tz->devices, &devices,
499                sizeof(struct acpi_handle_list))) {
500            memcpy(&tz->devices, &devices,
501                sizeof(struct acpi_handle_list));
502            ACPI_THERMAL_TRIPS_EXCEPTION(flag, "device");
503        }
504    }
505
506    return 0;
507}
508
509static int acpi_thermal_get_trip_points(struct acpi_thermal *tz)
510{
511    int i, valid, ret = acpi_thermal_trips_update(tz, ACPI_TRIPS_INIT);
512
513    if (ret)
514        return ret;
515
516    valid = tz->trips.critical.flags.valid |
517        tz->trips.hot.flags.valid |
518        tz->trips.passive.flags.valid;
519
520    for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++)
521        valid |= tz->trips.active[i].flags.valid;
522
523    if (!valid) {
524        printk(KERN_WARNING FW_BUG "No valid trip found\n");
525        return -ENODEV;
526    }
527    return 0;
528}
529
530static void acpi_thermal_check(void *data)
531{
532    struct acpi_thermal *tz = data;
533
534    thermal_zone_device_update(tz->thermal_zone);
535}
536
537/* sys I/F for generic thermal sysfs support */
538#define KELVIN_TO_MILLICELSIUS(t, off) (((t) - (off)) * 100)
539
540static int thermal_get_temp(struct thermal_zone_device *thermal,
541                unsigned long *temp)
542{
543    struct acpi_thermal *tz = thermal->devdata;
544    int result;
545
546    if (!tz)
547        return -EINVAL;
548
549    result = acpi_thermal_get_temperature(tz);
550    if (result)
551        return result;
552
553    *temp = KELVIN_TO_MILLICELSIUS(tz->temperature, tz->kelvin_offset);
554    return 0;
555}
556
557static int thermal_get_mode(struct thermal_zone_device *thermal,
558                enum thermal_device_mode *mode)
559{
560    struct acpi_thermal *tz = thermal->devdata;
561
562    if (!tz)
563        return -EINVAL;
564
565    *mode = tz->tz_enabled ? THERMAL_DEVICE_ENABLED :
566        THERMAL_DEVICE_DISABLED;
567
568    return 0;
569}
570
571static int thermal_set_mode(struct thermal_zone_device *thermal,
572                enum thermal_device_mode mode)
573{
574    struct acpi_thermal *tz = thermal->devdata;
575    int enable;
576
577    if (!tz)
578        return -EINVAL;
579
580    /*
581     * enable/disable thermal management from ACPI thermal driver
582     */
583    if (mode == THERMAL_DEVICE_ENABLED)
584        enable = 1;
585    else if (mode == THERMAL_DEVICE_DISABLED)
586        enable = 0;
587    else
588        return -EINVAL;
589
590    if (enable != tz->tz_enabled) {
591        tz->tz_enabled = enable;
592        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
593            "%s kernel ACPI thermal control\n",
594            tz->tz_enabled ? "Enable" : "Disable"));
595        acpi_thermal_check(tz);
596    }
597    return 0;
598}
599
600static int thermal_get_trip_type(struct thermal_zone_device *thermal,
601                 int trip, enum thermal_trip_type *type)
602{
603    struct acpi_thermal *tz = thermal->devdata;
604    int i;
605
606    if (!tz || trip < 0)
607        return -EINVAL;
608
609    if (tz->trips.critical.flags.valid) {
610        if (!trip) {
611            *type = THERMAL_TRIP_CRITICAL;
612            return 0;
613        }
614        trip--;
615    }
616
617    if (tz->trips.hot.flags.valid) {
618        if (!trip) {
619            *type = THERMAL_TRIP_HOT;
620            return 0;
621        }
622        trip--;
623    }
624
625    if (tz->trips.passive.flags.valid) {
626        if (!trip) {
627            *type = THERMAL_TRIP_PASSIVE;
628            return 0;
629        }
630        trip--;
631    }
632
633    for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
634        tz->trips.active[i].flags.valid; i++) {
635        if (!trip) {
636            *type = THERMAL_TRIP_ACTIVE;
637            return 0;
638        }
639        trip--;
640    }
641
642    return -EINVAL;
643}
644
645static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
646                 int trip, unsigned long *temp)
647{
648    struct acpi_thermal *tz = thermal->devdata;
649    int i;
650
651    if (!tz || trip < 0)
652        return -EINVAL;
653
654    if (tz->trips.critical.flags.valid) {
655        if (!trip) {
656            *temp = KELVIN_TO_MILLICELSIUS(
657                tz->trips.critical.temperature,
658                tz->kelvin_offset);
659            return 0;
660        }
661        trip--;
662    }
663
664    if (tz->trips.hot.flags.valid) {
665        if (!trip) {
666            *temp = KELVIN_TO_MILLICELSIUS(
667                tz->trips.hot.temperature,
668                tz->kelvin_offset);
669            return 0;
670        }
671        trip--;
672    }
673
674    if (tz->trips.passive.flags.valid) {
675        if (!trip) {
676            *temp = KELVIN_TO_MILLICELSIUS(
677                tz->trips.passive.temperature,
678                tz->kelvin_offset);
679            return 0;
680        }
681        trip--;
682    }
683
684    for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
685        tz->trips.active[i].flags.valid; i++) {
686        if (!trip) {
687            *temp = KELVIN_TO_MILLICELSIUS(
688                tz->trips.active[i].temperature,
689                tz->kelvin_offset);
690            return 0;
691        }
692        trip--;
693    }
694
695    return -EINVAL;
696}
697
698static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
699                unsigned long *temperature) {
700    struct acpi_thermal *tz = thermal->devdata;
701
702    if (tz->trips.critical.flags.valid) {
703        *temperature = KELVIN_TO_MILLICELSIUS(
704                tz->trips.critical.temperature,
705                tz->kelvin_offset);
706        return 0;
707    } else
708        return -EINVAL;
709}
710
711static int thermal_notify(struct thermal_zone_device *thermal, int trip,
712               enum thermal_trip_type trip_type)
713{
714    u8 type = 0;
715    struct acpi_thermal *tz = thermal->devdata;
716
717    if (trip_type == THERMAL_TRIP_CRITICAL)
718        type = ACPI_THERMAL_NOTIFY_CRITICAL;
719    else if (trip_type == THERMAL_TRIP_HOT)
720        type = ACPI_THERMAL_NOTIFY_HOT;
721    else
722        return 0;
723
724    acpi_bus_generate_proc_event(tz->device, type, 1);
725    acpi_bus_generate_netlink_event(tz->device->pnp.device_class,
726                    dev_name(&tz->device->dev), type, 1);
727
728    if (trip_type == THERMAL_TRIP_CRITICAL && nocrt)
729        return 1;
730
731    return 0;
732}
733
734typedef int (*cb)(struct thermal_zone_device *, int,
735          struct thermal_cooling_device *);
736static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
737                    struct thermal_cooling_device *cdev,
738                    cb action)
739{
740    struct acpi_device *device = cdev->devdata;
741    struct acpi_thermal *tz = thermal->devdata;
742    struct acpi_device *dev;
743    acpi_status status;
744    acpi_handle handle;
745    int i;
746    int j;
747    int trip = -1;
748    int result = 0;
749
750    if (tz->trips.critical.flags.valid)
751        trip++;
752
753    if (tz->trips.hot.flags.valid)
754        trip++;
755
756    if (tz->trips.passive.flags.valid) {
757        trip++;
758        for (i = 0; i < tz->trips.passive.devices.count;
759            i++) {
760            handle = tz->trips.passive.devices.handles[i];
761            status = acpi_bus_get_device(handle, &dev);
762            if (ACPI_SUCCESS(status) && (dev == device)) {
763                result = action(thermal, trip, cdev);
764                if (result)
765                    goto failed;
766            }
767        }
768    }
769
770    for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
771        if (!tz->trips.active[i].flags.valid)
772            break;
773        trip++;
774        for (j = 0;
775            j < tz->trips.active[i].devices.count;
776            j++) {
777            handle = tz->trips.active[i].devices.handles[j];
778            status = acpi_bus_get_device(handle, &dev);
779            if (ACPI_SUCCESS(status) && (dev == device)) {
780                result = action(thermal, trip, cdev);
781                if (result)
782                    goto failed;
783            }
784        }
785    }
786
787    for (i = 0; i < tz->devices.count; i++) {
788        handle = tz->devices.handles[i];
789        status = acpi_bus_get_device(handle, &dev);
790        if (ACPI_SUCCESS(status) && (dev == device)) {
791            result = action(thermal, -1, cdev);
792            if (result)
793                goto failed;
794        }
795    }
796
797failed:
798    return result;
799}
800
801static int
802acpi_thermal_bind_cooling_device(struct thermal_zone_device *thermal,
803                    struct thermal_cooling_device *cdev)
804{
805    return acpi_thermal_cooling_device_cb(thermal, cdev,
806                thermal_zone_bind_cooling_device);
807}
808
809static int
810acpi_thermal_unbind_cooling_device(struct thermal_zone_device *thermal,
811                    struct thermal_cooling_device *cdev)
812{
813    return acpi_thermal_cooling_device_cb(thermal, cdev,
814                thermal_zone_unbind_cooling_device);
815}
816
817static const struct thermal_zone_device_ops acpi_thermal_zone_ops = {
818    .bind = acpi_thermal_bind_cooling_device,
819    .unbind = acpi_thermal_unbind_cooling_device,
820    .get_temp = thermal_get_temp,
821    .get_mode = thermal_get_mode,
822    .set_mode = thermal_set_mode,
823    .get_trip_type = thermal_get_trip_type,
824    .get_trip_temp = thermal_get_trip_temp,
825    .get_crit_temp = thermal_get_crit_temp,
826    .notify = thermal_notify,
827};
828
829static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
830{
831    int trips = 0;
832    int result;
833    acpi_status status;
834    int i;
835
836    if (tz->trips.critical.flags.valid)
837        trips++;
838
839    if (tz->trips.hot.flags.valid)
840        trips++;
841
842    if (tz->trips.passive.flags.valid)
843        trips++;
844
845    for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE &&
846            tz->trips.active[i].flags.valid; i++, trips++);
847
848    if (tz->trips.passive.flags.valid)
849        tz->thermal_zone =
850            thermal_zone_device_register("acpitz", trips, 0, tz,
851                             &acpi_thermal_zone_ops,
852                             tz->trips.passive.tc1,
853                             tz->trips.passive.tc2,
854                             tz->trips.passive.tsp*100,
855                             tz->polling_frequency*100);
856    else
857        tz->thermal_zone =
858            thermal_zone_device_register("acpitz", trips, 0, tz,
859                             &acpi_thermal_zone_ops,
860                             0, 0, 0,
861                             tz->polling_frequency*100);
862    if (IS_ERR(tz->thermal_zone))
863        return -ENODEV;
864
865    result = sysfs_create_link(&tz->device->dev.kobj,
866                   &tz->thermal_zone->device.kobj, "thermal_zone");
867    if (result)
868        return result;
869
870    result = sysfs_create_link(&tz->thermal_zone->device.kobj,
871                   &tz->device->dev.kobj, "device");
872    if (result)
873        return result;
874
875    status = acpi_attach_data(tz->device->handle,
876                  acpi_bus_private_data_handler,
877                  tz->thermal_zone);
878    if (ACPI_FAILURE(status)) {
879        printk(KERN_ERR PREFIX
880                "Error attaching device data\n");
881        return -ENODEV;
882    }
883
884    tz->tz_enabled = 1;
885
886    dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
887         tz->thermal_zone->id);
888    return 0;
889}
890
891static void acpi_thermal_unregister_thermal_zone(struct acpi_thermal *tz)
892{
893    sysfs_remove_link(&tz->device->dev.kobj, "thermal_zone");
894    sysfs_remove_link(&tz->thermal_zone->device.kobj, "device");
895    thermal_zone_device_unregister(tz->thermal_zone);
896    tz->thermal_zone = NULL;
897    acpi_detach_data(tz->device->handle, acpi_bus_private_data_handler);
898}
899
900
901/* --------------------------------------------------------------------------
902                                 Driver Interface
903   -------------------------------------------------------------------------- */
904
905static void acpi_thermal_notify(struct acpi_device *device, u32 event)
906{
907    struct acpi_thermal *tz = acpi_driver_data(device);
908
909
910    if (!tz)
911        return;
912
913    switch (event) {
914    case ACPI_THERMAL_NOTIFY_TEMPERATURE:
915        acpi_thermal_check(tz);
916        break;
917    case ACPI_THERMAL_NOTIFY_THRESHOLDS:
918        acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_THRESHOLDS);
919        acpi_thermal_check(tz);
920        acpi_bus_generate_proc_event(device, event, 0);
921        acpi_bus_generate_netlink_event(device->pnp.device_class,
922                          dev_name(&device->dev), event, 0);
923        break;
924    case ACPI_THERMAL_NOTIFY_DEVICES:
925        acpi_thermal_trips_update(tz, ACPI_TRIPS_REFRESH_DEVICES);
926        acpi_thermal_check(tz);
927        acpi_bus_generate_proc_event(device, event, 0);
928        acpi_bus_generate_netlink_event(device->pnp.device_class,
929                          dev_name(&device->dev), event, 0);
930        break;
931    default:
932        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
933                  "Unsupported event [0x%x]\n", event));
934        break;
935    }
936}
937
938static int acpi_thermal_get_info(struct acpi_thermal *tz)
939{
940    int result = 0;
941
942
943    if (!tz)
944        return -EINVAL;
945
946    /* Get trip points [_CRT, _PSV, etc.] (required) */
947    result = acpi_thermal_get_trip_points(tz);
948    if (result)
949        return result;
950
951    /* Get temperature [_TMP] (required) */
952    result = acpi_thermal_get_temperature(tz);
953    if (result)
954        return result;
955
956    /* Set the cooling mode [_SCP] to active cooling (default) */
957    result = acpi_thermal_set_cooling_mode(tz, ACPI_THERMAL_MODE_ACTIVE);
958    if (!result)
959        tz->flags.cooling_mode = 1;
960
961    /* Get default polling frequency [_TZP] (optional) */
962    if (tzp)
963        tz->polling_frequency = tzp;
964    else
965        acpi_thermal_get_polling_frequency(tz);
966
967    return 0;
968}
969
970/*
971 * The exact offset between Kelvin and degree Celsius is 273.15. However ACPI
972 * handles temperature values with a single decimal place. As a consequence,
973 * some implementations use an offset of 273.1 and others use an offset of
974 * 273.2. Try to find out which one is being used, to present the most
975 * accurate and visually appealing number.
976 *
977 * The heuristic below should work for all ACPI thermal zones which have a
978 * critical trip point with a value being a multiple of 0.5 degree Celsius.
979 */
980static void acpi_thermal_guess_offset(struct acpi_thermal *tz)
981{
982    if (tz->trips.critical.flags.valid &&
983        (tz->trips.critical.temperature % 5) == 1)
984        tz->kelvin_offset = 2731;
985    else
986        tz->kelvin_offset = 2732;
987}
988
989static int acpi_thermal_add(struct acpi_device *device)
990{
991    int result = 0;
992    struct acpi_thermal *tz = NULL;
993
994
995    if (!device)
996        return -EINVAL;
997
998    tz = kzalloc(sizeof(struct acpi_thermal), GFP_KERNEL);
999    if (!tz)
1000        return -ENOMEM;
1001
1002    tz->device = device;
1003    strcpy(tz->name, device->pnp.bus_id);
1004    strcpy(acpi_device_name(device), ACPI_THERMAL_DEVICE_NAME);
1005    strcpy(acpi_device_class(device), ACPI_THERMAL_CLASS);
1006    device->driver_data = tz;
1007    mutex_init(&tz->lock);
1008
1009
1010    result = acpi_thermal_get_info(tz);
1011    if (result)
1012        goto free_memory;
1013
1014    acpi_thermal_guess_offset(tz);
1015
1016    result = acpi_thermal_register_thermal_zone(tz);
1017    if (result)
1018        goto free_memory;
1019
1020    printk(KERN_INFO PREFIX "%s [%s] (%ld C)\n",
1021           acpi_device_name(device), acpi_device_bid(device),
1022           KELVIN_TO_CELSIUS(tz->temperature));
1023    goto end;
1024
1025free_memory:
1026    kfree(tz);
1027end:
1028    return result;
1029}
1030
1031static int acpi_thermal_remove(struct acpi_device *device, int type)
1032{
1033    struct acpi_thermal *tz = NULL;
1034
1035    if (!device || !acpi_driver_data(device))
1036        return -EINVAL;
1037
1038    tz = acpi_driver_data(device);
1039
1040    acpi_thermal_unregister_thermal_zone(tz);
1041    mutex_destroy(&tz->lock);
1042    kfree(tz);
1043    return 0;
1044}
1045
1046#ifdef CONFIG_PM_SLEEP
1047static int acpi_thermal_resume(struct device *dev)
1048{
1049    struct acpi_thermal *tz;
1050    int i, j, power_state, result;
1051
1052    if (!dev)
1053        return -EINVAL;
1054
1055    tz = acpi_driver_data(to_acpi_device(dev));
1056    if (!tz)
1057        return -EINVAL;
1058
1059    for (i = 0; i < ACPI_THERMAL_MAX_ACTIVE; i++) {
1060        if (!(&tz->trips.active[i]))
1061            break;
1062        if (!tz->trips.active[i].flags.valid)
1063            break;
1064        tz->trips.active[i].flags.enabled = 1;
1065        for (j = 0; j < tz->trips.active[i].devices.count; j++) {
1066            result = acpi_bus_update_power(
1067                    tz->trips.active[i].devices.handles[j],
1068                    &power_state);
1069            if (result || (power_state != ACPI_STATE_D0)) {
1070                tz->trips.active[i].flags.enabled = 0;
1071                break;
1072            }
1073        }
1074        tz->state.active |= tz->trips.active[i].flags.enabled;
1075    }
1076
1077    acpi_thermal_check(tz);
1078
1079    return AE_OK;
1080}
1081#endif
1082
1083static int thermal_act(const struct dmi_system_id *d) {
1084
1085    if (act == 0) {
1086        printk(KERN_NOTICE "ACPI: %s detected: "
1087            "disabling all active thermal trip points\n", d->ident);
1088        act = -1;
1089    }
1090    return 0;
1091}
1092static int thermal_nocrt(const struct dmi_system_id *d) {
1093
1094    printk(KERN_NOTICE "ACPI: %s detected: "
1095        "disabling all critical thermal trip point actions.\n", d->ident);
1096    nocrt = 1;
1097    return 0;
1098}
1099static int thermal_tzp(const struct dmi_system_id *d) {
1100
1101    if (tzp == 0) {
1102        printk(KERN_NOTICE "ACPI: %s detected: "
1103            "enabling thermal zone polling\n", d->ident);
1104        tzp = 300; /* 300 dS = 30 Seconds */
1105    }
1106    return 0;
1107}
1108static int thermal_psv(const struct dmi_system_id *d) {
1109
1110    if (psv == 0) {
1111        printk(KERN_NOTICE "ACPI: %s detected: "
1112            "disabling all passive thermal trip points\n", d->ident);
1113        psv = -1;
1114    }
1115    return 0;
1116}
1117
1118static struct dmi_system_id thermal_dmi_table[] __initdata = {
1119    /*
1120     * Award BIOS on this AOpen makes thermal control almost worthless.
1121     * http://bugzilla.kernel.org/show_bug.cgi?id=8842
1122     */
1123    {
1124     .callback = thermal_act,
1125     .ident = "AOpen i915GMm-HFS",
1126     .matches = {
1127        DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1128        DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1129        },
1130    },
1131    {
1132     .callback = thermal_psv,
1133     .ident = "AOpen i915GMm-HFS",
1134     .matches = {
1135        DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1136        DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1137        },
1138    },
1139    {
1140     .callback = thermal_tzp,
1141     .ident = "AOpen i915GMm-HFS",
1142     .matches = {
1143        DMI_MATCH(DMI_BOARD_VENDOR, "AOpen"),
1144        DMI_MATCH(DMI_BOARD_NAME, "i915GMm-HFS"),
1145        },
1146    },
1147    {
1148     .callback = thermal_nocrt,
1149     .ident = "Gigabyte GA-7ZX",
1150     .matches = {
1151        DMI_MATCH(DMI_BOARD_VENDOR, "Gigabyte Technology Co., Ltd."),
1152        DMI_MATCH(DMI_BOARD_NAME, "7ZX"),
1153        },
1154    },
1155    {}
1156};
1157
1158static int __init acpi_thermal_init(void)
1159{
1160    int result = 0;
1161
1162    dmi_check_system(thermal_dmi_table);
1163
1164    if (off) {
1165        printk(KERN_NOTICE "ACPI: thermal control disabled\n");
1166        return -ENODEV;
1167    }
1168
1169    result = acpi_bus_register_driver(&acpi_thermal_driver);
1170    if (result < 0)
1171        return -ENODEV;
1172
1173    return 0;
1174}
1175
1176static void __exit acpi_thermal_exit(void)
1177{
1178
1179    acpi_bus_unregister_driver(&acpi_thermal_driver);
1180
1181    return;
1182}
1183
1184module_init(acpi_thermal_init);
1185module_exit(acpi_thermal_exit);
1186

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