Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/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 */
 66 static struct wf_sensor *sensor_cpu_power;
 67 static struct wf_sensor *sensor_cpu_temp;
 68 static struct wf_sensor *sensor_hd_temp;
 69 static struct wf_sensor *sensor_slots_power;
 70 static struct wf_control *fan_cpu_main;
 71 static struct wf_control *fan_cpu_second;
 72 static struct wf_control *fan_cpu_third;
 73 static struct wf_control *fan_hd;
 74 static struct wf_control *fan_slots;
 75 static struct wf_control *cpufreq_clamp;
 76 
 77 /* Set to kick the control loop into life */
 78 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
 79 static bool wf_smu_overtemp;
 80 
 81 /* Failure handling.. could be nicer */
 82 #define FAILURE_FAN             0x01
 83 #define FAILURE_SENSOR          0x02
 84 #define FAILURE_OVERTEMP        0x04
 85 
 86 static unsigned int wf_smu_failure_state;
 87 static int wf_smu_readjust, wf_smu_skipping;
 88 
 89 /*
 90  * ****** CPU Fans Control Loop ******
 91  *
 92  */
 93 
 94 
 95 #define WF_SMU_CPU_FANS_INTERVAL        1
 96 #define WF_SMU_CPU_FANS_MAX_HISTORY     16
 97 
 98 /* State data used by the cpu fans control loop
 99  */
100 struct wf_smu_cpu_fans_state {
101         int                     ticks;
102         s32                     cpu_setpoint;
103         struct wf_cpu_pid_state pid;
104 };
105 
106 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
107 
108 
109 
110 /*
111  * ****** Drive Fan Control Loop ******
112  *
113  */
114 
115 struct wf_smu_drive_fans_state {
116         int                     ticks;
117         s32                     setpoint;
118         struct wf_pid_state     pid;
119 };
120 
121 static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
122 
123 /*
124  * ****** Slots Fan Control Loop ******
125  *
126  */
127 
128 struct wf_smu_slots_fans_state {
129         int                     ticks;
130         s32                     setpoint;
131         struct wf_pid_state     pid;
132 };
133 
134 static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
135 
136 /*
137  * ***** Implementation *****
138  *
139  */
140 
141 
142 static void wf_smu_create_cpu_fans(void)
143 {
144         struct wf_cpu_pid_param pid_param;
145         const struct smu_sdbp_header *hdr;
146         struct smu_sdbp_cpupiddata *piddata;
147         struct smu_sdbp_fvt *fvt;
148         s32 tmax, tdelta, maxpow, powadj;
149 
150         /* First, locate the PID params in SMU SBD */
151         hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
152         if (hdr == 0) {
153                 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
154                        "max fan speed\n");
155                 goto fail;
156         }
157         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
158 
159         /* Get the FVT params for operating point 0 (the only supported one
160          * for now) in order to get tmax
161          */
162         hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
163         if (hdr) {
164                 fvt = (struct smu_sdbp_fvt *)&hdr[1];
165                 tmax = ((s32)fvt->maxtemp) << 16;
166         } else
167                 tmax = 0x5e0000; /* 94 degree default */
168 
169         /* Alloc & initialize state */
170         wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
171                                   GFP_KERNEL);
172         if (wf_smu_cpu_fans == NULL)
173                 goto fail;
174         wf_smu_cpu_fans->ticks = 1;
175 
176         /* Fill PID params */
177         pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
178         pid_param.history_len = piddata->history_len;
179         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
180                 printk(KERN_WARNING "windfarm: History size overflow on "
181                        "CPU control loop (%d)\n", piddata->history_len);
182                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
183         }
184         pid_param.gd = piddata->gd;
185         pid_param.gp = piddata->gp;
186         pid_param.gr = piddata->gr / pid_param.history_len;
187 
188         tdelta = ((s32)piddata->target_temp_delta) << 16;
189         maxpow = ((s32)piddata->max_power) << 16;
190         powadj = ((s32)piddata->power_adj) << 16;
191 
192         pid_param.tmax = tmax;
193         pid_param.ttarget = tmax - tdelta;
194         pid_param.pmaxadj = maxpow - powadj;
195 
196         pid_param.min = wf_control_get_min(fan_cpu_main);
197         pid_param.max = wf_control_get_max(fan_cpu_main);
198 
199         wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
200 
201         DBG("wf: CPU Fan control initialized.\n");
202         DBG("    ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
203             FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
204             pid_param.min, pid_param.max);
205 
206         return;
207 
208  fail:
209         printk(KERN_WARNING "windfarm: CPU fan config not found\n"
210                "for this machine model, max fan speed\n");
211 
212         if (cpufreq_clamp)
213                 wf_control_set_max(cpufreq_clamp);
214         if (fan_cpu_main)
215                 wf_control_set_max(fan_cpu_main);
216 }
217 
218 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
219 {
220         s32 new_setpoint, temp, power;
221         int rc;
222 
223         if (--st->ticks != 0) {
224                 if (wf_smu_readjust)
225                         goto readjust;
226                 return;
227         }
228         st->ticks = WF_SMU_CPU_FANS_INTERVAL;
229 
230         rc = wf_sensor_get(sensor_cpu_temp, &temp);
231         if (rc) {
232                 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
233                        rc);
234                 wf_smu_failure_state |= FAILURE_SENSOR;
235                 return;
236         }
237 
238         rc = wf_sensor_get(sensor_cpu_power, &power);
239         if (rc) {
240                 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
241                        rc);
242                 wf_smu_failure_state |= FAILURE_SENSOR;
243                 return;
244         }
245 
246         DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
247             FIX32TOPRINT(temp), FIX32TOPRINT(power));
248 
249 #ifdef HACKED_OVERTEMP
250         if (temp > 0x4a0000)
251                 wf_smu_failure_state |= FAILURE_OVERTEMP;
252 #else
253         if (temp > st->pid.param.tmax)
254                 wf_smu_failure_state |= FAILURE_OVERTEMP;
255 #endif
256         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
257 
258         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
259 
260         if (st->cpu_setpoint == new_setpoint)
261                 return;
262         st->cpu_setpoint = new_setpoint;
263  readjust:
264         if (fan_cpu_main && wf_smu_failure_state == 0) {
265                 rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
266                 if (rc) {
267                         printk(KERN_WARNING "windfarm: CPU main fan"
268                                " error %d\n", rc);
269                         wf_smu_failure_state |= FAILURE_FAN;
270                 }
271         }
272         if (fan_cpu_second && wf_smu_failure_state == 0) {
273                 rc = wf_control_set(fan_cpu_second, st->cpu_setpoint);
274                 if (rc) {
275                         printk(KERN_WARNING "windfarm: CPU second fan"
276                                " error %d\n", rc);
277                         wf_smu_failure_state |= FAILURE_FAN;
278                 }
279         }
280         if (fan_cpu_third && wf_smu_failure_state == 0) {
281                 rc = wf_control_set(fan_cpu_third, st->cpu_setpoint);
282                 if (rc) {
283                         printk(KERN_WARNING "windfarm: CPU third fan"
284                                " error %d\n", rc);
285                         wf_smu_failure_state |= FAILURE_FAN;
286                 }
287         }
288 }
289 
290 static void wf_smu_create_drive_fans(void)
291 {
292         struct wf_pid_param param = {
293                 .interval       = 5,
294                 .history_len    = 2,
295                 .gd             = 0x01e00000,
296                 .gp             = 0x00500000,
297                 .gr             = 0x00000000,
298                 .itarget        = 0x00200000,
299         };
300 
301         /* Alloc & initialize state */
302         wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
303                                         GFP_KERNEL);
304         if (wf_smu_drive_fans == NULL) {
305                 printk(KERN_WARNING "windfarm: Memory allocation error"
306                        " max fan speed\n");
307                 goto fail;
308         }
309         wf_smu_drive_fans->ticks = 1;
310 
311         /* Fill PID params */
312         param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
313         param.min = wf_control_get_min(fan_hd);
314         param.max = wf_control_get_max(fan_hd);
315         wf_pid_init(&wf_smu_drive_fans->pid, &param);
316 
317         DBG("wf: Drive Fan control initialized.\n");
318         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
319             FIX32TOPRINT(param.itarget), param.min, param.max);
320         return;
321 
322  fail:
323         if (fan_hd)
324                 wf_control_set_max(fan_hd);
325 }
326 
327 static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
328 {
329         s32 new_setpoint, temp;
330         int rc;
331 
332         if (--st->ticks != 0) {
333                 if (wf_smu_readjust)
334                         goto readjust;
335                 return;
336         }
337         st->ticks = st->pid.param.interval;
338 
339         rc = wf_sensor_get(sensor_hd_temp, &temp);
340         if (rc) {
341                 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
342                        rc);
343                 wf_smu_failure_state |= FAILURE_SENSOR;
344                 return;
345         }
346 
347         DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
348             FIX32TOPRINT(temp));
349 
350         if (temp > (st->pid.param.itarget + 0x50000))
351                 wf_smu_failure_state |= FAILURE_OVERTEMP;
352 
353         new_setpoint = wf_pid_run(&st->pid, temp);
354 
355         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
356 
357         if (st->setpoint == new_setpoint)
358                 return;
359         st->setpoint = new_setpoint;
360  readjust:
361         if (fan_hd && wf_smu_failure_state == 0) {
362                 rc = wf_control_set(fan_hd, st->setpoint);
363                 if (rc) {
364                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
365                                rc);
366                         wf_smu_failure_state |= FAILURE_FAN;
367                 }
368         }
369 }
370 
371 static void wf_smu_create_slots_fans(void)
372 {
373         struct wf_pid_param param = {
374                 .interval       = 1,
375                 .history_len    = 8,
376                 .gd             = 0x00000000,
377                 .gp             = 0x00000000,
378                 .gr             = 0x00020000,
379                 .itarget        = 0x00000000
380         };
381 
382         /* Alloc & initialize state */
383         wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
384                                         GFP_KERNEL);
385         if (wf_smu_slots_fans == NULL) {
386                 printk(KERN_WARNING "windfarm: Memory allocation error"
387                        " max fan speed\n");
388                 goto fail;
389         }
390         wf_smu_slots_fans->ticks = 1;
391 
392         /* Fill PID params */
393         param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
394         param.min = wf_control_get_min(fan_slots);
395         param.max = wf_control_get_max(fan_slots);
396         wf_pid_init(&wf_smu_slots_fans->pid, &param);
397 
398         DBG("wf: Slots Fan control initialized.\n");
399         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
400             FIX32TOPRINT(param.itarget), param.min, param.max);
401         return;
402 
403  fail:
404         if (fan_slots)
405                 wf_control_set_max(fan_slots);
406 }
407 
408 static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
409 {
410         s32 new_setpoint, power;
411         int rc;
412 
413         if (--st->ticks != 0) {
414                 if (wf_smu_readjust)
415                         goto readjust;
416                 return;
417         }
418         st->ticks = st->pid.param.interval;
419 
420         rc = wf_sensor_get(sensor_slots_power, &power);
421         if (rc) {
422                 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
423                        rc);
424                 wf_smu_failure_state |= FAILURE_SENSOR;
425                 return;
426         }
427 
428         DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
429             FIX32TOPRINT(power));
430 
431 #if 0 /* Check what makes a good overtemp condition */
432         if (power > (st->pid.param.itarget + 0x50000))
433                 wf_smu_failure_state |= FAILURE_OVERTEMP;
434 #endif
435 
436         new_setpoint = wf_pid_run(&st->pid, power);
437 
438         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
439 
440         if (st->setpoint == new_setpoint)
441                 return;
442         st->setpoint = new_setpoint;
443  readjust:
444         if (fan_slots && wf_smu_failure_state == 0) {
445                 rc = wf_control_set(fan_slots, st->setpoint);
446                 if (rc) {
447                         printk(KERN_WARNING "windfarm: Slots fan error %d\n",
448                                rc);
449                         wf_smu_failure_state |= FAILURE_FAN;
450                 }
451         }
452 }
453 
454 
455 /*
456  * ****** Setup / Init / Misc ... ******
457  *
458  */
459 
460 static void wf_smu_tick(void)
461 {
462         unsigned int last_failure = wf_smu_failure_state;
463         unsigned int new_failure;
464 
465         if (!wf_smu_started) {
466                 DBG("wf: creating control loops !\n");
467                 wf_smu_create_drive_fans();
468                 wf_smu_create_slots_fans();
469                 wf_smu_create_cpu_fans();
470                 wf_smu_started = 1;
471         }
472 
473         /* Skipping ticks */
474         if (wf_smu_skipping && --wf_smu_skipping)
475                 return;
476 
477         wf_smu_failure_state = 0;
478         if (wf_smu_drive_fans)
479                 wf_smu_drive_fans_tick(wf_smu_drive_fans);
480         if (wf_smu_slots_fans)
481                 wf_smu_slots_fans_tick(wf_smu_slots_fans);
482         if (wf_smu_cpu_fans)
483                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
484 
485         wf_smu_readjust = 0;
486         new_failure = wf_smu_failure_state & ~last_failure;
487 
488         /* If entering failure mode, clamp cpufreq and ramp all
489          * fans to full speed.
490          */
491         if (wf_smu_failure_state && !last_failure) {
492                 if (cpufreq_clamp)
493                         wf_control_set_max(cpufreq_clamp);
494                 if (fan_cpu_main)
495                         wf_control_set_max(fan_cpu_main);
496                 if (fan_cpu_second)
497                         wf_control_set_max(fan_cpu_second);
498                 if (fan_cpu_third)
499                         wf_control_set_max(fan_cpu_third);
500                 if (fan_hd)
501                         wf_control_set_max(fan_hd);
502                 if (fan_slots)
503                         wf_control_set_max(fan_slots);
504         }
505 
506         /* If leaving failure mode, unclamp cpufreq and readjust
507          * all fans on next iteration
508          */
509         if (!wf_smu_failure_state && last_failure) {
510                 if (cpufreq_clamp)
511                         wf_control_set_min(cpufreq_clamp);
512                 wf_smu_readjust = 1;
513         }
514 
515         /* Overtemp condition detected, notify and start skipping a couple
516          * ticks to let the temperature go down
517          */
518         if (new_failure & FAILURE_OVERTEMP) {
519                 wf_set_overtemp();
520                 wf_smu_skipping = 2;
521                 wf_smu_overtemp = true;
522         }
523 
524         /* We only clear the overtemp condition if overtemp is cleared
525          * _and_ no other failure is present. Since a sensor error will
526          * clear the overtemp condition (can't measure temperature) at
527          * the control loop levels, but we don't want to keep it clear
528          * here in this case
529          */
530         if (!wf_smu_failure_state && wf_smu_overtemp) {
531                 wf_clear_overtemp();
532                 wf_smu_overtemp = false;
533         }
534 }
535 
536 
537 static void wf_smu_new_control(struct wf_control *ct)
538 {
539         if (wf_smu_all_controls_ok)
540                 return;
541 
542         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
543                 if (wf_get_control(ct) == 0)
544                         fan_cpu_main = ct;
545         }
546 
547         if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
548                 if (wf_get_control(ct) == 0)
549                         fan_cpu_second = ct;
550         }
551 
552         if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
553                 if (wf_get_control(ct) == 0)
554                         fan_cpu_third = ct;
555         }
556 
557         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
558                 if (wf_get_control(ct) == 0)
559                         cpufreq_clamp = ct;
560         }
561 
562         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
563                 if (wf_get_control(ct) == 0)
564                         fan_hd = ct;
565         }
566 
567         if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
568                 if (wf_get_control(ct) == 0)
569                         fan_slots = ct;
570         }
571 
572         if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
573             fan_slots && cpufreq_clamp)
574                 wf_smu_all_controls_ok = 1;
575 }
576 
577 static void wf_smu_new_sensor(struct wf_sensor *sr)
578 {
579         if (wf_smu_all_sensors_ok)
580                 return;
581 
582         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
583                 if (wf_get_sensor(sr) == 0)
584                         sensor_cpu_power = sr;
585         }
586 
587         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
588                 if (wf_get_sensor(sr) == 0)
589                         sensor_cpu_temp = sr;
590         }
591 
592         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
593                 if (wf_get_sensor(sr) == 0)
594                         sensor_hd_temp = sr;
595         }
596 
597         if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
598                 if (wf_get_sensor(sr) == 0)
599                         sensor_slots_power = sr;
600         }
601 
602         if (sensor_cpu_power && sensor_cpu_temp &&
603             sensor_hd_temp && sensor_slots_power)
604                 wf_smu_all_sensors_ok = 1;
605 }
606 
607 
608 static int wf_smu_notify(struct notifier_block *self,
609                                unsigned long event, void *data)
610 {
611         switch(event) {
612         case WF_EVENT_NEW_CONTROL:
613                 DBG("wf: new control %s detected\n",
614                     ((struct wf_control *)data)->name);
615                 wf_smu_new_control(data);
616                 wf_smu_readjust = 1;
617                 break;
618         case WF_EVENT_NEW_SENSOR:
619                 DBG("wf: new sensor %s detected\n",
620                     ((struct wf_sensor *)data)->name);
621                 wf_smu_new_sensor(data);
622                 break;
623         case WF_EVENT_TICK:
624                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
625                         wf_smu_tick();
626         }
627 
628         return 0;
629 }
630 
631 static struct notifier_block wf_smu_events = {
632         .notifier_call  = wf_smu_notify,
633 };
634 
635 static int wf_init_pm(void)
636 {
637         printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
638 
639         return 0;
640 }
641 
642 static int wf_smu_probe(struct platform_device *ddev)
643 {
644         wf_register_client(&wf_smu_events);
645 
646         return 0;
647 }
648 
649 static int wf_smu_remove(struct platform_device *ddev)
650 {
651         wf_unregister_client(&wf_smu_events);
652 
653         /* XXX We don't have yet a guarantee that our callback isn't
654          * in progress when returning from wf_unregister_client, so
655          * we add an arbitrary delay. I'll have to fix that in the core
656          */
657         msleep(1000);
658 
659         /* Release all sensors */
660         /* One more crappy race: I don't think we have any guarantee here
661          * that the attribute callback won't race with the sensor beeing
662          * disposed of, and I'm not 100% certain what best way to deal
663          * with that except by adding locks all over... I'll do that
664          * eventually but heh, who ever rmmod this module anyway ?
665          */
666         if (sensor_cpu_power)
667                 wf_put_sensor(sensor_cpu_power);
668         if (sensor_cpu_temp)
669                 wf_put_sensor(sensor_cpu_temp);
670         if (sensor_hd_temp)
671                 wf_put_sensor(sensor_hd_temp);
672         if (sensor_slots_power)
673                 wf_put_sensor(sensor_slots_power);
674 
675         /* Release all controls */
676         if (fan_cpu_main)
677                 wf_put_control(fan_cpu_main);
678         if (fan_cpu_second)
679                 wf_put_control(fan_cpu_second);
680         if (fan_cpu_third)
681                 wf_put_control(fan_cpu_third);
682         if (fan_hd)
683                 wf_put_control(fan_hd);
684         if (fan_slots)
685                 wf_put_control(fan_slots);
686         if (cpufreq_clamp)
687                 wf_put_control(cpufreq_clamp);
688 
689         /* Destroy control loops state structures */
690         kfree(wf_smu_slots_fans);
691         kfree(wf_smu_drive_fans);
692         kfree(wf_smu_cpu_fans);
693 
694         return 0;
695 }
696 
697 static struct platform_driver wf_smu_driver = {
698         .probe = wf_smu_probe,
699         .remove = wf_smu_remove,
700         .driver = {
701                 .name = "windfarm",
702                 .owner  = THIS_MODULE,
703         },
704 };
705 
706 
707 static int __init wf_smu_init(void)
708 {
709         int rc = -ENODEV;
710 
711         if (of_machine_is_compatible("PowerMac9,1"))
712                 rc = wf_init_pm();
713 
714         if (rc == 0) {
715 #ifdef MODULE
716                 request_module("windfarm_smu_controls");
717                 request_module("windfarm_smu_sensors");
718                 request_module("windfarm_lm75_sensor");
719                 request_module("windfarm_cpufreq_clamp");
720 
721 #endif /* MODULE */
722                 platform_driver_register(&wf_smu_driver);
723         }
724 
725         return rc;
726 }
727 
728 static void __exit wf_smu_exit(void)
729 {
730 
731         platform_driver_unregister(&wf_smu_driver);
732 }
733 
734 
735 module_init(wf_smu_init);
736 module_exit(wf_smu_exit);
737 
738 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
739 MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
740 MODULE_LICENSE("GPL");
741 
742 MODULE_ALIAS("platform:windfarm");
743 

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