Root/drivers/macintosh/windfarm_pm91.c

1/*
2 * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops
3 *
4 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
5 * <benh@kernel.crashing.org>
6 *
7 * Released under the term of the GNU GPL v2.
8 *
9 * The algorithm used is the PID control algorithm, used the same
10 * way the published Darwin code does, using the same values that
11 * are present in the Darwin 8.2 snapshot property lists (note however
12 * that none of the code has been re-used, it's a complete re-implementation
13 *
14 * The various control loops found in Darwin config file are:
15 *
16 * PowerMac9,1
17 * ===========
18 *
19 * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't
20 * try to play with other control loops fans). Drive bay is rather basic PID
21 * with one sensor and one fan. Slots area is a bit different as the Darwin
22 * driver is supposed to be capable of working in a special "AGP" mode which
23 * involves the presence of an AGP sensor and an AGP fan (possibly on the
24 * AGP card itself). I can't deal with that special mode as I don't have
25 * access to those additional sensor/fans for now (though ultimately, it would
26 * be possible to add sensor objects for them) so I'm only implementing the
27 * basic PCI slot control loop
28 */
29
30#include <linux/types.h>
31#include <linux/errno.h>
32#include <linux/kernel.h>
33#include <linux/delay.h>
34#include <linux/slab.h>
35#include <linux/init.h>
36#include <linux/spinlock.h>
37#include <linux/wait.h>
38#include <linux/kmod.h>
39#include <linux/device.h>
40#include <linux/platform_device.h>
41#include <asm/prom.h>
42#include <asm/machdep.h>
43#include <asm/io.h>
44#include <asm/sections.h>
45#include <asm/smu.h>
46
47#include "windfarm.h"
48#include "windfarm_pid.h"
49
50#define VERSION "0.4"
51
52#undef DEBUG
53
54#ifdef DEBUG
55#define DBG(args...) printk(args)
56#else
57#define DBG(args...) do { } while(0)
58#endif
59
60/* define this to force CPU overtemp to 74 degree, useful for testing
61 * the overtemp code
62 */
63#undef HACKED_OVERTEMP
64
65/* Controls & sensors */
66static struct wf_sensor *sensor_cpu_power;
67static struct wf_sensor *sensor_cpu_temp;
68static struct wf_sensor *sensor_hd_temp;
69static struct wf_sensor *sensor_slots_power;
70static struct wf_control *fan_cpu_main;
71static struct wf_control *fan_cpu_second;
72static struct wf_control *fan_cpu_third;
73static struct wf_control *fan_hd;
74static struct wf_control *fan_slots;
75static struct wf_control *cpufreq_clamp;
76
77/* Set to kick the control loop into life */
78static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
79
80/* Failure handling.. could be nicer */
81#define FAILURE_FAN 0x01
82#define FAILURE_SENSOR 0x02
83#define FAILURE_OVERTEMP 0x04
84
85static unsigned int wf_smu_failure_state;
86static int wf_smu_readjust, wf_smu_skipping;
87
88/*
89 * ****** CPU Fans Control Loop ******
90 *
91 */
92
93
94#define WF_SMU_CPU_FANS_INTERVAL 1
95#define WF_SMU_CPU_FANS_MAX_HISTORY 16
96
97/* State data used by the cpu fans control loop
98 */
99struct wf_smu_cpu_fans_state {
100    int ticks;
101    s32 cpu_setpoint;
102    struct wf_cpu_pid_state pid;
103};
104
105static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
106
107
108
109/*
110 * ****** Drive Fan Control Loop ******
111 *
112 */
113
114struct wf_smu_drive_fans_state {
115    int ticks;
116    s32 setpoint;
117    struct wf_pid_state pid;
118};
119
120static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
121
122/*
123 * ****** Slots Fan Control Loop ******
124 *
125 */
126
127struct wf_smu_slots_fans_state {
128    int ticks;
129    s32 setpoint;
130    struct wf_pid_state pid;
131};
132
133static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
134
135/*
136 * ***** Implementation *****
137 *
138 */
139
140
141static void wf_smu_create_cpu_fans(void)
142{
143    struct wf_cpu_pid_param pid_param;
144    const struct smu_sdbp_header *hdr;
145    struct smu_sdbp_cpupiddata *piddata;
146    struct smu_sdbp_fvt *fvt;
147    s32 tmax, tdelta, maxpow, powadj;
148
149    /* First, locate the PID params in SMU SBD */
150    hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
151    if (hdr == 0) {
152        printk(KERN_WARNING "windfarm: CPU PID fan config not found "
153               "max fan speed\n");
154        goto fail;
155    }
156    piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
157
158    /* Get the FVT params for operating point 0 (the only supported one
159     * for now) in order to get tmax
160     */
161    hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
162    if (hdr) {
163        fvt = (struct smu_sdbp_fvt *)&hdr[1];
164        tmax = ((s32)fvt->maxtemp) << 16;
165    } else
166        tmax = 0x5e0000; /* 94 degree default */
167
168    /* Alloc & initialize state */
169    wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
170                  GFP_KERNEL);
171    if (wf_smu_cpu_fans == NULL)
172        goto fail;
173           wf_smu_cpu_fans->ticks = 1;
174
175    /* Fill PID params */
176    pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
177    pid_param.history_len = piddata->history_len;
178    if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
179        printk(KERN_WARNING "windfarm: History size overflow on "
180               "CPU control loop (%d)\n", piddata->history_len);
181        pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
182    }
183    pid_param.gd = piddata->gd;
184    pid_param.gp = piddata->gp;
185    pid_param.gr = piddata->gr / pid_param.history_len;
186
187    tdelta = ((s32)piddata->target_temp_delta) << 16;
188    maxpow = ((s32)piddata->max_power) << 16;
189    powadj = ((s32)piddata->power_adj) << 16;
190
191    pid_param.tmax = tmax;
192    pid_param.ttarget = tmax - tdelta;
193    pid_param.pmaxadj = maxpow - powadj;
194
195    pid_param.min = wf_control_get_min(fan_cpu_main);
196    pid_param.max = wf_control_get_max(fan_cpu_main);
197
198    wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
199
200    DBG("wf: CPU Fan control initialized.\n");
201    DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
202        FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
203        pid_param.min, pid_param.max);
204
205    return;
206
207 fail:
208    printk(KERN_WARNING "windfarm: CPU fan config not found\n"
209           "for this machine model, max fan speed\n");
210
211    if (cpufreq_clamp)
212        wf_control_set_max(cpufreq_clamp);
213    if (fan_cpu_main)
214        wf_control_set_max(fan_cpu_main);
215}
216
217static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
218{
219    s32 new_setpoint, temp, power;
220    int rc;
221
222    if (--st->ticks != 0) {
223        if (wf_smu_readjust)
224            goto readjust;
225        return;
226    }
227    st->ticks = WF_SMU_CPU_FANS_INTERVAL;
228
229    rc = wf_sensor_get(sensor_cpu_temp, &temp);
230    if (rc) {
231        printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
232               rc);
233        wf_smu_failure_state |= FAILURE_SENSOR;
234        return;
235    }
236
237    rc = wf_sensor_get(sensor_cpu_power, &power);
238    if (rc) {
239        printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
240               rc);
241        wf_smu_failure_state |= FAILURE_SENSOR;
242        return;
243    }
244
245    DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
246        FIX32TOPRINT(temp), FIX32TOPRINT(power));
247
248#ifdef HACKED_OVERTEMP
249    if (temp > 0x4a0000)
250        wf_smu_failure_state |= FAILURE_OVERTEMP;
251#else
252    if (temp > st->pid.param.tmax)
253        wf_smu_failure_state |= FAILURE_OVERTEMP;
254#endif
255    new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
256
257    DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
258
259    if (st->cpu_setpoint == new_setpoint)
260        return;
261    st->cpu_setpoint = new_setpoint;
262 readjust:
263    if (fan_cpu_main && wf_smu_failure_state == 0) {
264        rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
265        if (rc) {
266            printk(KERN_WARNING "windfarm: CPU main fan"
267                   " error %d\n", rc);
268            wf_smu_failure_state |= FAILURE_FAN;
269        }
270    }
271    if (fan_cpu_second && wf_smu_failure_state == 0) {
272        rc = wf_control_set(fan_cpu_second, st->cpu_setpoint);
273        if (rc) {
274            printk(KERN_WARNING "windfarm: CPU second fan"
275                   " error %d\n", rc);
276            wf_smu_failure_state |= FAILURE_FAN;
277        }
278    }
279    if (fan_cpu_third && wf_smu_failure_state == 0) {
280        rc = wf_control_set(fan_cpu_third, st->cpu_setpoint);
281        if (rc) {
282            printk(KERN_WARNING "windfarm: CPU third fan"
283                   " error %d\n", rc);
284            wf_smu_failure_state |= FAILURE_FAN;
285        }
286    }
287}
288
289static void wf_smu_create_drive_fans(void)
290{
291    struct wf_pid_param param = {
292        .interval = 5,
293        .history_len = 2,
294        .gd = 0x01e00000,
295        .gp = 0x00500000,
296        .gr = 0x00000000,
297        .itarget = 0x00200000,
298    };
299
300    /* Alloc & initialize state */
301    wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
302                    GFP_KERNEL);
303    if (wf_smu_drive_fans == NULL) {
304        printk(KERN_WARNING "windfarm: Memory allocation error"
305               " max fan speed\n");
306        goto fail;
307    }
308           wf_smu_drive_fans->ticks = 1;
309
310    /* Fill PID params */
311    param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
312    param.min = wf_control_get_min(fan_hd);
313    param.max = wf_control_get_max(fan_hd);
314    wf_pid_init(&wf_smu_drive_fans->pid, &param);
315
316    DBG("wf: Drive Fan control initialized.\n");
317    DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
318        FIX32TOPRINT(param.itarget), param.min, param.max);
319    return;
320
321 fail:
322    if (fan_hd)
323        wf_control_set_max(fan_hd);
324}
325
326static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
327{
328    s32 new_setpoint, temp;
329    int rc;
330
331    if (--st->ticks != 0) {
332        if (wf_smu_readjust)
333            goto readjust;
334        return;
335    }
336    st->ticks = st->pid.param.interval;
337
338    rc = wf_sensor_get(sensor_hd_temp, &temp);
339    if (rc) {
340        printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
341               rc);
342        wf_smu_failure_state |= FAILURE_SENSOR;
343        return;
344    }
345
346    DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
347        FIX32TOPRINT(temp));
348
349    if (temp > (st->pid.param.itarget + 0x50000))
350        wf_smu_failure_state |= FAILURE_OVERTEMP;
351
352    new_setpoint = wf_pid_run(&st->pid, temp);
353
354    DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
355
356    if (st->setpoint == new_setpoint)
357        return;
358    st->setpoint = new_setpoint;
359 readjust:
360    if (fan_hd && wf_smu_failure_state == 0) {
361        rc = wf_control_set(fan_hd, st->setpoint);
362        if (rc) {
363            printk(KERN_WARNING "windfarm: HD fan error %d\n",
364                   rc);
365            wf_smu_failure_state |= FAILURE_FAN;
366        }
367    }
368}
369
370static void wf_smu_create_slots_fans(void)
371{
372    struct wf_pid_param param = {
373        .interval = 1,
374        .history_len = 8,
375        .gd = 0x00000000,
376        .gp = 0x00000000,
377        .gr = 0x00020000,
378        .itarget = 0x00000000
379    };
380
381    /* Alloc & initialize state */
382    wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
383                    GFP_KERNEL);
384    if (wf_smu_slots_fans == NULL) {
385        printk(KERN_WARNING "windfarm: Memory allocation error"
386               " max fan speed\n");
387        goto fail;
388    }
389           wf_smu_slots_fans->ticks = 1;
390
391    /* Fill PID params */
392    param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
393    param.min = wf_control_get_min(fan_slots);
394    param.max = wf_control_get_max(fan_slots);
395    wf_pid_init(&wf_smu_slots_fans->pid, &param);
396
397    DBG("wf: Slots Fan control initialized.\n");
398    DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
399        FIX32TOPRINT(param.itarget), param.min, param.max);
400    return;
401
402 fail:
403    if (fan_slots)
404        wf_control_set_max(fan_slots);
405}
406
407static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
408{
409    s32 new_setpoint, power;
410    int rc;
411
412    if (--st->ticks != 0) {
413        if (wf_smu_readjust)
414            goto readjust;
415        return;
416    }
417    st->ticks = st->pid.param.interval;
418
419    rc = wf_sensor_get(sensor_slots_power, &power);
420    if (rc) {
421        printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
422               rc);
423        wf_smu_failure_state |= FAILURE_SENSOR;
424        return;
425    }
426
427    DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
428        FIX32TOPRINT(power));
429
430#if 0 /* Check what makes a good overtemp condition */
431    if (power > (st->pid.param.itarget + 0x50000))
432        wf_smu_failure_state |= FAILURE_OVERTEMP;
433#endif
434
435    new_setpoint = wf_pid_run(&st->pid, power);
436
437    DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
438
439    if (st->setpoint == new_setpoint)
440        return;
441    st->setpoint = new_setpoint;
442 readjust:
443    if (fan_slots && wf_smu_failure_state == 0) {
444        rc = wf_control_set(fan_slots, st->setpoint);
445        if (rc) {
446            printk(KERN_WARNING "windfarm: Slots fan error %d\n",
447                   rc);
448            wf_smu_failure_state |= FAILURE_FAN;
449        }
450    }
451}
452
453
454/*
455 * ****** Setup / Init / Misc ... ******
456 *
457 */
458
459static void wf_smu_tick(void)
460{
461    unsigned int last_failure = wf_smu_failure_state;
462    unsigned int new_failure;
463
464    if (!wf_smu_started) {
465        DBG("wf: creating control loops !\n");
466        wf_smu_create_drive_fans();
467        wf_smu_create_slots_fans();
468        wf_smu_create_cpu_fans();
469        wf_smu_started = 1;
470    }
471
472    /* Skipping ticks */
473    if (wf_smu_skipping && --wf_smu_skipping)
474        return;
475
476    wf_smu_failure_state = 0;
477    if (wf_smu_drive_fans)
478        wf_smu_drive_fans_tick(wf_smu_drive_fans);
479    if (wf_smu_slots_fans)
480        wf_smu_slots_fans_tick(wf_smu_slots_fans);
481    if (wf_smu_cpu_fans)
482        wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
483
484    wf_smu_readjust = 0;
485    new_failure = wf_smu_failure_state & ~last_failure;
486
487    /* If entering failure mode, clamp cpufreq and ramp all
488     * fans to full speed.
489     */
490    if (wf_smu_failure_state && !last_failure) {
491        if (cpufreq_clamp)
492            wf_control_set_max(cpufreq_clamp);
493        if (fan_cpu_main)
494            wf_control_set_max(fan_cpu_main);
495        if (fan_cpu_second)
496            wf_control_set_max(fan_cpu_second);
497        if (fan_cpu_third)
498            wf_control_set_max(fan_cpu_third);
499        if (fan_hd)
500            wf_control_set_max(fan_hd);
501        if (fan_slots)
502            wf_control_set_max(fan_slots);
503    }
504
505    /* If leaving failure mode, unclamp cpufreq and readjust
506     * all fans on next iteration
507     */
508    if (!wf_smu_failure_state && last_failure) {
509        if (cpufreq_clamp)
510            wf_control_set_min(cpufreq_clamp);
511        wf_smu_readjust = 1;
512    }
513
514    /* Overtemp condition detected, notify and start skipping a couple
515     * ticks to let the temperature go down
516     */
517    if (new_failure & FAILURE_OVERTEMP) {
518        wf_set_overtemp();
519        wf_smu_skipping = 2;
520    }
521
522    /* We only clear the overtemp condition if overtemp is cleared
523     * _and_ no other failure is present. Since a sensor error will
524     * clear the overtemp condition (can't measure temperature) at
525     * the control loop levels, but we don't want to keep it clear
526     * here in this case
527     */
528    if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
529        wf_clear_overtemp();
530}
531
532
533static void wf_smu_new_control(struct wf_control *ct)
534{
535    if (wf_smu_all_controls_ok)
536        return;
537
538    if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
539        if (wf_get_control(ct) == 0)
540            fan_cpu_main = ct;
541    }
542
543    if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
544        if (wf_get_control(ct) == 0)
545            fan_cpu_second = ct;
546    }
547
548    if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
549        if (wf_get_control(ct) == 0)
550            fan_cpu_third = ct;
551    }
552
553    if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
554        if (wf_get_control(ct) == 0)
555            cpufreq_clamp = ct;
556    }
557
558    if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
559        if (wf_get_control(ct) == 0)
560            fan_hd = ct;
561    }
562
563    if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
564        if (wf_get_control(ct) == 0)
565            fan_slots = ct;
566    }
567
568    if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
569        fan_slots && cpufreq_clamp)
570        wf_smu_all_controls_ok = 1;
571}
572
573static void wf_smu_new_sensor(struct wf_sensor *sr)
574{
575    if (wf_smu_all_sensors_ok)
576        return;
577
578    if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
579        if (wf_get_sensor(sr) == 0)
580            sensor_cpu_power = sr;
581    }
582
583    if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
584        if (wf_get_sensor(sr) == 0)
585            sensor_cpu_temp = sr;
586    }
587
588    if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
589        if (wf_get_sensor(sr) == 0)
590            sensor_hd_temp = sr;
591    }
592
593    if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
594        if (wf_get_sensor(sr) == 0)
595            sensor_slots_power = sr;
596    }
597
598    if (sensor_cpu_power && sensor_cpu_temp &&
599        sensor_hd_temp && sensor_slots_power)
600        wf_smu_all_sensors_ok = 1;
601}
602
603
604static int wf_smu_notify(struct notifier_block *self,
605                   unsigned long event, void *data)
606{
607    switch(event) {
608    case WF_EVENT_NEW_CONTROL:
609        DBG("wf: new control %s detected\n",
610            ((struct wf_control *)data)->name);
611        wf_smu_new_control(data);
612        wf_smu_readjust = 1;
613        break;
614    case WF_EVENT_NEW_SENSOR:
615        DBG("wf: new sensor %s detected\n",
616            ((struct wf_sensor *)data)->name);
617        wf_smu_new_sensor(data);
618        break;
619    case WF_EVENT_TICK:
620        if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
621            wf_smu_tick();
622    }
623
624    return 0;
625}
626
627static struct notifier_block wf_smu_events = {
628    .notifier_call = wf_smu_notify,
629};
630
631static int wf_init_pm(void)
632{
633    printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
634
635    return 0;
636}
637
638static int wf_smu_probe(struct platform_device *ddev)
639{
640    wf_register_client(&wf_smu_events);
641
642    return 0;
643}
644
645static int __devexit wf_smu_remove(struct platform_device *ddev)
646{
647    wf_unregister_client(&wf_smu_events);
648
649    /* XXX We don't have yet a guarantee that our callback isn't
650     * in progress when returning from wf_unregister_client, so
651     * we add an arbitrary delay. I'll have to fix that in the core
652     */
653    msleep(1000);
654
655    /* Release all sensors */
656    /* One more crappy race: I don't think we have any guarantee here
657     * that the attribute callback won't race with the sensor beeing
658     * disposed of, and I'm not 100% certain what best way to deal
659     * with that except by adding locks all over... I'll do that
660     * eventually but heh, who ever rmmod this module anyway ?
661     */
662    if (sensor_cpu_power)
663        wf_put_sensor(sensor_cpu_power);
664    if (sensor_cpu_temp)
665        wf_put_sensor(sensor_cpu_temp);
666    if (sensor_hd_temp)
667        wf_put_sensor(sensor_hd_temp);
668    if (sensor_slots_power)
669        wf_put_sensor(sensor_slots_power);
670
671    /* Release all controls */
672    if (fan_cpu_main)
673        wf_put_control(fan_cpu_main);
674    if (fan_cpu_second)
675        wf_put_control(fan_cpu_second);
676    if (fan_cpu_third)
677        wf_put_control(fan_cpu_third);
678    if (fan_hd)
679        wf_put_control(fan_hd);
680    if (fan_slots)
681        wf_put_control(fan_slots);
682    if (cpufreq_clamp)
683        wf_put_control(cpufreq_clamp);
684
685    /* Destroy control loops state structures */
686    kfree(wf_smu_slots_fans);
687    kfree(wf_smu_drive_fans);
688    kfree(wf_smu_cpu_fans);
689
690    return 0;
691}
692
693static struct platform_driver wf_smu_driver = {
694        .probe = wf_smu_probe,
695        .remove = __devexit_p(wf_smu_remove),
696    .driver = {
697        .name = "windfarm",
698        .owner = THIS_MODULE,
699    },
700};
701
702
703static int __init wf_smu_init(void)
704{
705    int rc = -ENODEV;
706
707    if (of_machine_is_compatible("PowerMac9,1"))
708        rc = wf_init_pm();
709
710    if (rc == 0) {
711#ifdef MODULE
712        request_module("windfarm_smu_controls");
713        request_module("windfarm_smu_sensors");
714        request_module("windfarm_lm75_sensor");
715        request_module("windfarm_cpufreq_clamp");
716
717#endif /* MODULE */
718        platform_driver_register(&wf_smu_driver);
719    }
720
721    return rc;
722}
723
724static void __exit wf_smu_exit(void)
725{
726
727    platform_driver_unregister(&wf_smu_driver);
728}
729
730
731module_init(wf_smu_init);
732module_exit(wf_smu_exit);
733
734MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
735MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
736MODULE_LICENSE("GPL");
737
738MODULE_ALIAS("platform:windfarm");
739

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