Merge branch 'core/rcu' into core/rcu-for-linus
[linux-2.6.git] / drivers / macintosh / windfarm_pm81.c
1 /*
2  * Windfarm PowerMac thermal control. iMac G5
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  * PowerMac8,1 and PowerMac8,2
17  * ===========================
18  *
19  * System Fans control loop. Different based on models. In addition to the
20  * usual PID algorithm, the control loop gets 2 additional pairs of linear
21  * scaling factors (scale/offsets) expressed as 4.12 fixed point values
22  * signed offset, unsigned scale)
23  *
24  * The targets are modified such as:
25  *  - the linked control (second control) gets the target value as-is
26  *    (typically the drive fan)
27  *  - the main control (first control) gets the target value scaled with
28  *    the first pair of factors, and is then modified as below
29  *  - the value of the target of the CPU Fan control loop is retrieved,
30  *    scaled with the second pair of factors, and the max of that and
31  *    the scaled target is applied to the main control.
32  *
33  * # model_id: 2
34  *   controls       : system-fan, drive-bay-fan
35  *   sensors        : hd-temp
36  *   PID params     : G_d = 0x15400000
37  *                    G_p = 0x00200000
38  *                    G_r = 0x000002fd
39  *                    History = 2 entries
40  *                    Input target = 0x3a0000
41  *                    Interval = 5s
42  *   linear-factors : offset = 0xff38 scale  = 0x0ccd
43  *                    offset = 0x0208 scale  = 0x07ae
44  *
45  * # model_id: 3
46  *   controls       : system-fan, drive-bay-fan
47  *   sensors        : hd-temp
48  *   PID params     : G_d = 0x08e00000
49  *                    G_p = 0x00566666
50  *                    G_r = 0x0000072b
51  *                    History = 2 entries
52  *                    Input target = 0x350000
53  *                    Interval = 5s
54  *   linear-factors : offset = 0xff38 scale  = 0x0ccd
55  *                    offset = 0x0000 scale  = 0x0000
56  *
57  * # model_id: 5
58  *   controls       : system-fan
59  *   sensors        : hd-temp
60  *   PID params     : G_d = 0x15400000
61  *                    G_p = 0x00233333
62  *                    G_r = 0x000002fd
63  *                    History = 2 entries
64  *                    Input target = 0x3a0000
65  *                    Interval = 5s
66  *   linear-factors : offset = 0x0000 scale  = 0x1000
67  *                    offset = 0x0091 scale  = 0x0bae
68  *
69  * CPU Fan control loop. The loop is identical for all models. it
70  * has an additional pair of scaling factor. This is used to scale the
71  * systems fan control loop target result (the one before it gets scaled
72  * by the System Fans control loop itself). Then, the max value of the
73  * calculated target value and system fan value is sent to the fans
74  *
75  *   controls       : cpu-fan
76  *   sensors        : cpu-temp cpu-power
77  *   PID params     : From SMU sdb partition
78  *   linear-factors : offset = 0xfb50 scale  = 0x1000
79  *
80  * CPU Slew control loop. Not implemented. The cpufreq driver in linux is
81  * completely separate for now, though we could find a way to link it, either
82  * as a client reacting to overtemp notifications, or directling monitoring
83  * the CPU temperature
84  *
85  * WARNING ! The CPU control loop requires the CPU tmax for the current
86  * operating point. However, we currently are completely separated from
87  * the cpufreq driver and thus do not know what the current operating
88  * point is. Fortunately, we also do not have any hardware supporting anything
89  * but operating point 0 at the moment, thus we just peek that value directly
90  * from the SDB partition. If we ever end up with actually slewing the system
91  * clock and thus changing operating points, we'll have to find a way to
92  * communicate with the CPU freq driver;
93  *
94  */
95
96 #include <linux/types.h>
97 #include <linux/errno.h>
98 #include <linux/kernel.h>
99 #include <linux/delay.h>
100 #include <linux/slab.h>
101 #include <linux/init.h>
102 #include <linux/spinlock.h>
103 #include <linux/wait.h>
104 #include <linux/kmod.h>
105 #include <linux/device.h>
106 #include <linux/platform_device.h>
107 #include <asm/prom.h>
108 #include <asm/machdep.h>
109 #include <asm/io.h>
110 #include <asm/system.h>
111 #include <asm/sections.h>
112 #include <asm/smu.h>
113
114 #include "windfarm.h"
115 #include "windfarm_pid.h"
116
117 #define VERSION "0.4"
118
119 #undef DEBUG
120
121 #ifdef DEBUG
122 #define DBG(args...)    printk(args)
123 #else
124 #define DBG(args...)    do { } while(0)
125 #endif
126
127 /* define this to force CPU overtemp to 74 degree, useful for testing
128  * the overtemp code
129  */
130 #undef HACKED_OVERTEMP
131
132 static int wf_smu_mach_model;   /* machine model id */
133
134 /* Controls & sensors */
135 static struct wf_sensor *sensor_cpu_power;
136 static struct wf_sensor *sensor_cpu_temp;
137 static struct wf_sensor *sensor_hd_temp;
138 static struct wf_control *fan_cpu_main;
139 static struct wf_control *fan_hd;
140 static struct wf_control *fan_system;
141 static struct wf_control *cpufreq_clamp;
142
143 /* Set to kick the control loop into life */
144 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
145
146 /* Failure handling.. could be nicer */
147 #define FAILURE_FAN             0x01
148 #define FAILURE_SENSOR          0x02
149 #define FAILURE_OVERTEMP        0x04
150
151 static unsigned int wf_smu_failure_state;
152 static int wf_smu_readjust, wf_smu_skipping;
153
154 /*
155  * ****** System Fans Control Loop ******
156  *
157  */
158
159 /* Parameters for the System Fans control loop. Parameters
160  * not in this table such as interval, history size, ...
161  * are common to all versions and thus hard coded for now.
162  */
163 struct wf_smu_sys_fans_param {
164         int     model_id;
165         s32     itarget;
166         s32     gd, gp, gr;
167
168         s16     offset0;
169         u16     scale0;
170         s16     offset1;
171         u16     scale1;
172 };
173
174 #define WF_SMU_SYS_FANS_INTERVAL        5
175 #define WF_SMU_SYS_FANS_HISTORY_SIZE    2
176
177 /* State data used by the system fans control loop
178  */
179 struct wf_smu_sys_fans_state {
180         int                     ticks;
181         s32                     sys_setpoint;
182         s32                     hd_setpoint;
183         s16                     offset0;
184         u16                     scale0;
185         s16                     offset1;
186         u16                     scale1;
187         struct wf_pid_state     pid;
188 };
189
190 /*
191  * Configs for SMU Sytem Fan control loop
192  */
193 static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
194         /* Model ID 2 */
195         {
196                 .model_id       = 2,
197                 .itarget        = 0x3a0000,
198                 .gd             = 0x15400000,
199                 .gp             = 0x00200000,
200                 .gr             = 0x000002fd,
201                 .offset0        = 0xff38,
202                 .scale0         = 0x0ccd,
203                 .offset1        = 0x0208,
204                 .scale1         = 0x07ae,
205         },
206         /* Model ID 3 */
207         {
208                 .model_id       = 3,
209                 .itarget        = 0x350000,
210                 .gd             = 0x08e00000,
211                 .gp             = 0x00566666,
212                 .gr             = 0x0000072b,
213                 .offset0        = 0xff38,
214                 .scale0         = 0x0ccd,
215                 .offset1        = 0x0000,
216                 .scale1         = 0x0000,
217         },
218         /* Model ID 5 */
219         {
220                 .model_id       = 5,
221                 .itarget        = 0x3a0000,
222                 .gd             = 0x15400000,
223                 .gp             = 0x00233333,
224                 .gr             = 0x000002fd,
225                 .offset0        = 0x0000,
226                 .scale0         = 0x1000,
227                 .offset1        = 0x0091,
228                 .scale1         = 0x0bae,
229         },
230 };
231 #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
232
233 static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
234
235 /*
236  * ****** CPU Fans Control Loop ******
237  *
238  */
239
240
241 #define WF_SMU_CPU_FANS_INTERVAL        1
242 #define WF_SMU_CPU_FANS_MAX_HISTORY     16
243 #define WF_SMU_CPU_FANS_SIBLING_SCALE   0x00001000
244 #define WF_SMU_CPU_FANS_SIBLING_OFFSET  0xfffffb50
245
246 /* State data used by the cpu fans control loop
247  */
248 struct wf_smu_cpu_fans_state {
249         int                     ticks;
250         s32                     cpu_setpoint;
251         s32                     scale;
252         s32                     offset;
253         struct wf_cpu_pid_state pid;
254 };
255
256 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
257
258
259
260 /*
261  * ***** Implementation *****
262  *
263  */
264
265 static void wf_smu_create_sys_fans(void)
266 {
267         struct wf_smu_sys_fans_param *param = NULL;
268         struct wf_pid_param pid_param;
269         int i;
270
271         /* First, locate the params for this model */
272         for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
273                 if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
274                         param = &wf_smu_sys_all_params[i];
275                         break;
276                 }
277
278         /* No params found, put fans to max */
279         if (param == NULL) {
280                 printk(KERN_WARNING "windfarm: System fan config not found "
281                        "for this machine model, max fan speed\n");
282                 goto fail;
283         }
284
285         /* Alloc & initialize state */
286         wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
287                                   GFP_KERNEL);
288         if (wf_smu_sys_fans == NULL) {
289                 printk(KERN_WARNING "windfarm: Memory allocation error"
290                        " max fan speed\n");
291                 goto fail;
292         }
293         wf_smu_sys_fans->ticks = 1;
294         wf_smu_sys_fans->scale0 = param->scale0;
295         wf_smu_sys_fans->offset0 = param->offset0;
296         wf_smu_sys_fans->scale1 = param->scale1;
297         wf_smu_sys_fans->offset1 = param->offset1;
298
299         /* Fill PID params */
300         pid_param.gd = param->gd;
301         pid_param.gp = param->gp;
302         pid_param.gr = param->gr;
303         pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
304         pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
305         pid_param.itarget = param->itarget;
306         pid_param.min = fan_system->ops->get_min(fan_system);
307         pid_param.max = fan_system->ops->get_max(fan_system);
308         if (fan_hd) {
309                 pid_param.min =
310                         max(pid_param.min,fan_hd->ops->get_min(fan_hd));
311                 pid_param.max =
312                         min(pid_param.max,fan_hd->ops->get_max(fan_hd));
313         }
314         wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
315
316         DBG("wf: System Fan control initialized.\n");
317         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
318             FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
319         return;
320
321  fail:
322
323         if (fan_system)
324                 wf_control_set_max(fan_system);
325         if (fan_hd)
326                 wf_control_set_max(fan_hd);
327 }
328
329 static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
330 {
331         s32 new_setpoint, temp, scaled, cputarget;
332         int rc;
333
334         if (--st->ticks != 0) {
335                 if (wf_smu_readjust)
336                         goto readjust;
337                 return;
338         }
339         st->ticks = WF_SMU_SYS_FANS_INTERVAL;
340
341         rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
342         if (rc) {
343                 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
344                        rc);
345                 wf_smu_failure_state |= FAILURE_SENSOR;
346                 return;
347         }
348
349         DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
350             FIX32TOPRINT(temp));
351
352         if (temp > (st->pid.param.itarget + 0x50000))
353                 wf_smu_failure_state |= FAILURE_OVERTEMP;
354
355         new_setpoint = wf_pid_run(&st->pid, temp);
356
357         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
358
359         scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
360
361         DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
362
363         cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
364         cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
365         scaled = max(scaled, cputarget);
366         scaled = max(scaled, st->pid.param.min);
367         scaled = min(scaled, st->pid.param.max);
368
369         DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
370
371         if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
372                 return;
373         st->sys_setpoint = scaled;
374         st->hd_setpoint = new_setpoint;
375  readjust:
376         if (fan_system && wf_smu_failure_state == 0) {
377                 rc = fan_system->ops->set_value(fan_system, st->sys_setpoint);
378                 if (rc) {
379                         printk(KERN_WARNING "windfarm: Sys fan error %d\n",
380                                rc);
381                         wf_smu_failure_state |= FAILURE_FAN;
382                 }
383         }
384         if (fan_hd && wf_smu_failure_state == 0) {
385                 rc = fan_hd->ops->set_value(fan_hd, st->hd_setpoint);
386                 if (rc) {
387                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
388                                rc);
389                         wf_smu_failure_state |= FAILURE_FAN;
390                 }
391         }
392 }
393
394 static void wf_smu_create_cpu_fans(void)
395 {
396         struct wf_cpu_pid_param pid_param;
397         const struct smu_sdbp_header *hdr;
398         struct smu_sdbp_cpupiddata *piddata;
399         struct smu_sdbp_fvt *fvt;
400         s32 tmax, tdelta, maxpow, powadj;
401
402         /* First, locate the PID params in SMU SBD */
403         hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
404         if (hdr == 0) {
405                 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
406                        "max fan speed\n");
407                 goto fail;
408         }
409         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
410
411         /* Get the FVT params for operating point 0 (the only supported one
412          * for now) in order to get tmax
413          */
414         hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
415         if (hdr) {
416                 fvt = (struct smu_sdbp_fvt *)&hdr[1];
417                 tmax = ((s32)fvt->maxtemp) << 16;
418         } else
419                 tmax = 0x5e0000; /* 94 degree default */
420
421         /* Alloc & initialize state */
422         wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
423                                   GFP_KERNEL);
424         if (wf_smu_cpu_fans == NULL)
425                 goto fail;
426         wf_smu_cpu_fans->ticks = 1;
427
428         wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
429         wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
430
431         /* Fill PID params */
432         pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
433         pid_param.history_len = piddata->history_len;
434         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
435                 printk(KERN_WARNING "windfarm: History size overflow on "
436                        "CPU control loop (%d)\n", piddata->history_len);
437                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
438         }
439         pid_param.gd = piddata->gd;
440         pid_param.gp = piddata->gp;
441         pid_param.gr = piddata->gr / pid_param.history_len;
442
443         tdelta = ((s32)piddata->target_temp_delta) << 16;
444         maxpow = ((s32)piddata->max_power) << 16;
445         powadj = ((s32)piddata->power_adj) << 16;
446
447         pid_param.tmax = tmax;
448         pid_param.ttarget = tmax - tdelta;
449         pid_param.pmaxadj = maxpow - powadj;
450
451         pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
452         pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);
453
454         wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
455
456         DBG("wf: CPU Fan control initialized.\n");
457         DBG("    ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
458             FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
459             pid_param.min, pid_param.max);
460
461         return;
462
463  fail:
464         printk(KERN_WARNING "windfarm: CPU fan config not found\n"
465                "for this machine model, max fan speed\n");
466
467         if (cpufreq_clamp)
468                 wf_control_set_max(cpufreq_clamp);
469         if (fan_cpu_main)
470                 wf_control_set_max(fan_cpu_main);
471 }
472
473 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
474 {
475         s32 new_setpoint, temp, power, systarget;
476         int rc;
477
478         if (--st->ticks != 0) {
479                 if (wf_smu_readjust)
480                         goto readjust;
481                 return;
482         }
483         st->ticks = WF_SMU_CPU_FANS_INTERVAL;
484
485         rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
486         if (rc) {
487                 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
488                        rc);
489                 wf_smu_failure_state |= FAILURE_SENSOR;
490                 return;
491         }
492
493         rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
494         if (rc) {
495                 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
496                        rc);
497                 wf_smu_failure_state |= FAILURE_SENSOR;
498                 return;
499         }
500
501         DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
502             FIX32TOPRINT(temp), FIX32TOPRINT(power));
503
504 #ifdef HACKED_OVERTEMP
505         if (temp > 0x4a0000)
506                 wf_smu_failure_state |= FAILURE_OVERTEMP;
507 #else
508         if (temp > st->pid.param.tmax)
509                 wf_smu_failure_state |= FAILURE_OVERTEMP;
510 #endif
511         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
512
513         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
514
515         systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
516         systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
517                 + st->offset;
518         new_setpoint = max(new_setpoint, systarget);
519         new_setpoint = max(new_setpoint, st->pid.param.min);
520         new_setpoint = min(new_setpoint, st->pid.param.max);
521
522         DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
523
524         if (st->cpu_setpoint == new_setpoint)
525                 return;
526         st->cpu_setpoint = new_setpoint;
527  readjust:
528         if (fan_cpu_main && wf_smu_failure_state == 0) {
529                 rc = fan_cpu_main->ops->set_value(fan_cpu_main,
530                                                   st->cpu_setpoint);
531                 if (rc) {
532                         printk(KERN_WARNING "windfarm: CPU main fan"
533                                " error %d\n", rc);
534                         wf_smu_failure_state |= FAILURE_FAN;
535                 }
536         }
537 }
538
539 /*
540  * ****** Setup / Init / Misc ... ******
541  *
542  */
543
544 static void wf_smu_tick(void)
545 {
546         unsigned int last_failure = wf_smu_failure_state;
547         unsigned int new_failure;
548
549         if (!wf_smu_started) {
550                 DBG("wf: creating control loops !\n");
551                 wf_smu_create_sys_fans();
552                 wf_smu_create_cpu_fans();
553                 wf_smu_started = 1;
554         }
555
556         /* Skipping ticks */
557         if (wf_smu_skipping && --wf_smu_skipping)
558                 return;
559
560         wf_smu_failure_state = 0;
561         if (wf_smu_sys_fans)
562                 wf_smu_sys_fans_tick(wf_smu_sys_fans);
563         if (wf_smu_cpu_fans)
564                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
565
566         wf_smu_readjust = 0;
567         new_failure = wf_smu_failure_state & ~last_failure;
568
569         /* If entering failure mode, clamp cpufreq and ramp all
570          * fans to full speed.
571          */
572         if (wf_smu_failure_state && !last_failure) {
573                 if (cpufreq_clamp)
574                         wf_control_set_max(cpufreq_clamp);
575                 if (fan_system)
576                         wf_control_set_max(fan_system);
577                 if (fan_cpu_main)
578                         wf_control_set_max(fan_cpu_main);
579                 if (fan_hd)
580                         wf_control_set_max(fan_hd);
581         }
582
583         /* If leaving failure mode, unclamp cpufreq and readjust
584          * all fans on next iteration
585          */
586         if (!wf_smu_failure_state && last_failure) {
587                 if (cpufreq_clamp)
588                         wf_control_set_min(cpufreq_clamp);
589                 wf_smu_readjust = 1;
590         }
591
592         /* Overtemp condition detected, notify and start skipping a couple
593          * ticks to let the temperature go down
594          */
595         if (new_failure & FAILURE_OVERTEMP) {
596                 wf_set_overtemp();
597                 wf_smu_skipping = 2;
598         }
599
600         /* We only clear the overtemp condition if overtemp is cleared
601          * _and_ no other failure is present. Since a sensor error will
602          * clear the overtemp condition (can't measure temperature) at
603          * the control loop levels, but we don't want to keep it clear
604          * here in this case
605          */
606         if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
607                 wf_clear_overtemp();
608 }
609
610 static void wf_smu_new_control(struct wf_control *ct)
611 {
612         if (wf_smu_all_controls_ok)
613                 return;
614
615         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
616                 if (wf_get_control(ct) == 0)
617                         fan_cpu_main = ct;
618         }
619
620         if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
621                 if (wf_get_control(ct) == 0)
622                         fan_system = ct;
623         }
624
625         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
626                 if (wf_get_control(ct) == 0)
627                         cpufreq_clamp = ct;
628         }
629
630         /* Darwin property list says the HD fan is only for model ID
631          * 0, 1, 2 and 3
632          */
633
634         if (wf_smu_mach_model > 3) {
635                 if (fan_system && fan_cpu_main && cpufreq_clamp)
636                         wf_smu_all_controls_ok = 1;
637                 return;
638         }
639
640         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
641                 if (wf_get_control(ct) == 0)
642                         fan_hd = ct;
643         }
644
645         if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
646                 wf_smu_all_controls_ok = 1;
647 }
648
649 static void wf_smu_new_sensor(struct wf_sensor *sr)
650 {
651         if (wf_smu_all_sensors_ok)
652                 return;
653
654         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
655                 if (wf_get_sensor(sr) == 0)
656                         sensor_cpu_power = sr;
657         }
658
659         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
660                 if (wf_get_sensor(sr) == 0)
661                         sensor_cpu_temp = sr;
662         }
663
664         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
665                 if (wf_get_sensor(sr) == 0)
666                         sensor_hd_temp = sr;
667         }
668
669         if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
670                 wf_smu_all_sensors_ok = 1;
671 }
672
673
674 static int wf_smu_notify(struct notifier_block *self,
675                                unsigned long event, void *data)
676 {
677         switch(event) {
678         case WF_EVENT_NEW_CONTROL:
679                 DBG("wf: new control %s detected\n",
680                     ((struct wf_control *)data)->name);
681                 wf_smu_new_control(data);
682                 wf_smu_readjust = 1;
683                 break;
684         case WF_EVENT_NEW_SENSOR:
685                 DBG("wf: new sensor %s detected\n",
686                     ((struct wf_sensor *)data)->name);
687                 wf_smu_new_sensor(data);
688                 break;
689         case WF_EVENT_TICK:
690                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
691                         wf_smu_tick();
692         }
693
694         return 0;
695 }
696
697 static struct notifier_block wf_smu_events = {
698         .notifier_call  = wf_smu_notify,
699 };
700
701 static int wf_init_pm(void)
702 {
703         const struct smu_sdbp_header *hdr;
704
705         hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
706         if (hdr != 0) {
707                 struct smu_sdbp_sensortree *st =
708                         (struct smu_sdbp_sensortree *)&hdr[1];
709                 wf_smu_mach_model = st->model_id;
710         }
711
712         printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
713                wf_smu_mach_model);
714
715         return 0;
716 }
717
718 static int wf_smu_probe(struct platform_device *ddev)
719 {
720         wf_register_client(&wf_smu_events);
721
722         return 0;
723 }
724
725 static int __devexit wf_smu_remove(struct platform_device *ddev)
726 {
727         wf_unregister_client(&wf_smu_events);
728
729         /* XXX We don't have yet a guarantee that our callback isn't
730          * in progress when returning from wf_unregister_client, so
731          * we add an arbitrary delay. I'll have to fix that in the core
732          */
733         msleep(1000);
734
735         /* Release all sensors */
736         /* One more crappy race: I don't think we have any guarantee here
737          * that the attribute callback won't race with the sensor beeing
738          * disposed of, and I'm not 100% certain what best way to deal
739          * with that except by adding locks all over... I'll do that
740          * eventually but heh, who ever rmmod this module anyway ?
741          */
742         if (sensor_cpu_power)
743                 wf_put_sensor(sensor_cpu_power);
744         if (sensor_cpu_temp)
745                 wf_put_sensor(sensor_cpu_temp);
746         if (sensor_hd_temp)
747                 wf_put_sensor(sensor_hd_temp);
748
749         /* Release all controls */
750         if (fan_cpu_main)
751                 wf_put_control(fan_cpu_main);
752         if (fan_hd)
753                 wf_put_control(fan_hd);
754         if (fan_system)
755                 wf_put_control(fan_system);
756         if (cpufreq_clamp)
757                 wf_put_control(cpufreq_clamp);
758
759         /* Destroy control loops state structures */
760         if (wf_smu_sys_fans)
761                 kfree(wf_smu_sys_fans);
762         if (wf_smu_cpu_fans)
763                 kfree(wf_smu_cpu_fans);
764
765         return 0;
766 }
767
768 static struct platform_driver wf_smu_driver = {
769         .probe = wf_smu_probe,
770         .remove = __devexit_p(wf_smu_remove),
771         .driver = {
772                 .name = "windfarm",
773                 .owner  = THIS_MODULE,
774         },
775 };
776
777
778 static int __init wf_smu_init(void)
779 {
780         int rc = -ENODEV;
781
782         if (machine_is_compatible("PowerMac8,1") ||
783             machine_is_compatible("PowerMac8,2"))
784                 rc = wf_init_pm();
785
786         if (rc == 0) {
787 #ifdef MODULE
788                 request_module("windfarm_smu_controls");
789                 request_module("windfarm_smu_sensors");
790                 request_module("windfarm_lm75_sensor");
791                 request_module("windfarm_cpufreq_clamp");
792
793 #endif /* MODULE */
794                 platform_driver_register(&wf_smu_driver);
795         }
796
797         return rc;
798 }
799
800 static void __exit wf_smu_exit(void)
801 {
802
803         platform_driver_unregister(&wf_smu_driver);
804 }
805
806
807 module_init(wf_smu_init);
808 module_exit(wf_smu_exit);
809
810 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
811 MODULE_DESCRIPTION("Thermal control logic for iMac G5");
812 MODULE_LICENSE("GPL");
813 MODULE_ALIAS("platform:windfarm");