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Linux/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/sections.h>
111 #include <asm/smu.h>
112 
113 #include "windfarm.h"
114 #include "windfarm_pid.h"
115 
116 #define VERSION "0.4"
117 
118 #undef DEBUG
119 
120 #ifdef DEBUG
121 #define DBG(args...)    printk(args)
122 #else
123 #define DBG(args...)    do { } while(0)
124 #endif
125 
126 /* define this to force CPU overtemp to 74 degree, useful for testing
127  * the overtemp code
128  */
129 #undef HACKED_OVERTEMP
130 
131 static int wf_smu_mach_model;   /* machine model id */
132 
133 /* Controls & sensors */
134 static struct wf_sensor *sensor_cpu_power;
135 static struct wf_sensor *sensor_cpu_temp;
136 static struct wf_sensor *sensor_hd_temp;
137 static struct wf_control *fan_cpu_main;
138 static struct wf_control *fan_hd;
139 static struct wf_control *fan_system;
140 static struct wf_control *cpufreq_clamp;
141 
142 /* Set to kick the control loop into life */
143 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
144 
145 /* Failure handling.. could be nicer */
146 #define FAILURE_FAN             0x01
147 #define FAILURE_SENSOR          0x02
148 #define FAILURE_OVERTEMP        0x04
149 
150 static unsigned int wf_smu_failure_state;
151 static int wf_smu_readjust, wf_smu_skipping;
152 static bool wf_smu_overtemp;
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 System 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 = wf_control_get_min(fan_system);
307         pid_param.max = wf_control_get_max(fan_system);
308         if (fan_hd) {
309                 pid_param.min =
310                         max(pid_param.min, wf_control_get_min(fan_hd));
311                 pid_param.max =
312                         min(pid_param.max, wf_control_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 = wf_sensor_get(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 = wf_control_set(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 = wf_control_set(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 = wf_control_get_min(fan_cpu_main);
452         pid_param.max = wf_control_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 = wf_sensor_get(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 = wf_sensor_get(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 = wf_control_set(fan_cpu_main, st->cpu_setpoint);
530                 if (rc) {
531                         printk(KERN_WARNING "windfarm: CPU main fan"
532                                " error %d\n", rc);
533                         wf_smu_failure_state |= FAILURE_FAN;
534                 }
535         }
536 }
537 
538 /*
539  * ****** Setup / Init / Misc ... ******
540  *
541  */
542 
543 static void wf_smu_tick(void)
544 {
545         unsigned int last_failure = wf_smu_failure_state;
546         unsigned int new_failure;
547 
548         if (!wf_smu_started) {
549                 DBG("wf: creating control loops !\n");
550                 wf_smu_create_sys_fans();
551                 wf_smu_create_cpu_fans();
552                 wf_smu_started = 1;
553         }
554 
555         /* Skipping ticks */
556         if (wf_smu_skipping && --wf_smu_skipping)
557                 return;
558 
559         wf_smu_failure_state = 0;
560         if (wf_smu_sys_fans)
561                 wf_smu_sys_fans_tick(wf_smu_sys_fans);
562         if (wf_smu_cpu_fans)
563                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
564 
565         wf_smu_readjust = 0;
566         new_failure = wf_smu_failure_state & ~last_failure;
567 
568         /* If entering failure mode, clamp cpufreq and ramp all
569          * fans to full speed.
570          */
571         if (wf_smu_failure_state && !last_failure) {
572                 if (cpufreq_clamp)
573                         wf_control_set_max(cpufreq_clamp);
574                 if (fan_system)
575                         wf_control_set_max(fan_system);
576                 if (fan_cpu_main)
577                         wf_control_set_max(fan_cpu_main);
578                 if (fan_hd)
579                         wf_control_set_max(fan_hd);
580         }
581 
582         /* If leaving failure mode, unclamp cpufreq and readjust
583          * all fans on next iteration
584          */
585         if (!wf_smu_failure_state && last_failure) {
586                 if (cpufreq_clamp)
587                         wf_control_set_min(cpufreq_clamp);
588                 wf_smu_readjust = 1;
589         }
590 
591         /* Overtemp condition detected, notify and start skipping a couple
592          * ticks to let the temperature go down
593          */
594         if (new_failure & FAILURE_OVERTEMP) {
595                 wf_set_overtemp();
596                 wf_smu_skipping = 2;
597                 wf_smu_overtemp = true;
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 (!wf_smu_failure_state && wf_smu_overtemp) {
607                 wf_clear_overtemp();
608                 wf_smu_overtemp = false;
609         }
610 }
611 
612 static void wf_smu_new_control(struct wf_control *ct)
613 {
614         if (wf_smu_all_controls_ok)
615                 return;
616 
617         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
618                 if (wf_get_control(ct) == 0)
619                         fan_cpu_main = ct;
620         }
621 
622         if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
623                 if (wf_get_control(ct) == 0)
624                         fan_system = ct;
625         }
626 
627         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
628                 if (wf_get_control(ct) == 0)
629                         cpufreq_clamp = ct;
630         }
631 
632         /* Darwin property list says the HD fan is only for model ID
633          * 0, 1, 2 and 3
634          */
635 
636         if (wf_smu_mach_model > 3) {
637                 if (fan_system && fan_cpu_main && cpufreq_clamp)
638                         wf_smu_all_controls_ok = 1;
639                 return;
640         }
641 
642         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
643                 if (wf_get_control(ct) == 0)
644                         fan_hd = ct;
645         }
646 
647         if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
648                 wf_smu_all_controls_ok = 1;
649 }
650 
651 static void wf_smu_new_sensor(struct wf_sensor *sr)
652 {
653         if (wf_smu_all_sensors_ok)
654                 return;
655 
656         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
657                 if (wf_get_sensor(sr) == 0)
658                         sensor_cpu_power = sr;
659         }
660 
661         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
662                 if (wf_get_sensor(sr) == 0)
663                         sensor_cpu_temp = sr;
664         }
665 
666         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
667                 if (wf_get_sensor(sr) == 0)
668                         sensor_hd_temp = sr;
669         }
670 
671         if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
672                 wf_smu_all_sensors_ok = 1;
673 }
674 
675 
676 static int wf_smu_notify(struct notifier_block *self,
677                                unsigned long event, void *data)
678 {
679         switch(event) {
680         case WF_EVENT_NEW_CONTROL:
681                 DBG("wf: new control %s detected\n",
682                     ((struct wf_control *)data)->name);
683                 wf_smu_new_control(data);
684                 wf_smu_readjust = 1;
685                 break;
686         case WF_EVENT_NEW_SENSOR:
687                 DBG("wf: new sensor %s detected\n",
688                     ((struct wf_sensor *)data)->name);
689                 wf_smu_new_sensor(data);
690                 break;
691         case WF_EVENT_TICK:
692                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
693                         wf_smu_tick();
694         }
695 
696         return 0;
697 }
698 
699 static struct notifier_block wf_smu_events = {
700         .notifier_call  = wf_smu_notify,
701 };
702 
703 static int wf_init_pm(void)
704 {
705         const struct smu_sdbp_header *hdr;
706 
707         hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
708         if (hdr != 0) {
709                 struct smu_sdbp_sensortree *st =
710                         (struct smu_sdbp_sensortree *)&hdr[1];
711                 wf_smu_mach_model = st->model_id;
712         }
713 
714         printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
715                wf_smu_mach_model);
716 
717         return 0;
718 }
719 
720 static int wf_smu_probe(struct platform_device *ddev)
721 {
722         wf_register_client(&wf_smu_events);
723 
724         return 0;
725 }
726 
727 static int wf_smu_remove(struct platform_device *ddev)
728 {
729         wf_unregister_client(&wf_smu_events);
730 
731         /* XXX We don't have yet a guarantee that our callback isn't
732          * in progress when returning from wf_unregister_client, so
733          * we add an arbitrary delay. I'll have to fix that in the core
734          */
735         msleep(1000);
736 
737         /* Release all sensors */
738         /* One more crappy race: I don't think we have any guarantee here
739          * that the attribute callback won't race with the sensor beeing
740          * disposed of, and I'm not 100% certain what best way to deal
741          * with that except by adding locks all over... I'll do that
742          * eventually but heh, who ever rmmod this module anyway ?
743          */
744         if (sensor_cpu_power)
745                 wf_put_sensor(sensor_cpu_power);
746         if (sensor_cpu_temp)
747                 wf_put_sensor(sensor_cpu_temp);
748         if (sensor_hd_temp)
749                 wf_put_sensor(sensor_hd_temp);
750 
751         /* Release all controls */
752         if (fan_cpu_main)
753                 wf_put_control(fan_cpu_main);
754         if (fan_hd)
755                 wf_put_control(fan_hd);
756         if (fan_system)
757                 wf_put_control(fan_system);
758         if (cpufreq_clamp)
759                 wf_put_control(cpufreq_clamp);
760 
761         /* Destroy control loops state structures */
762         kfree(wf_smu_sys_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 = 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 (of_machine_is_compatible("PowerMac8,1") ||
783             of_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");
814 

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