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windfarm_pm81.c
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1 /*
2  * Windfarm PowerMac thermal control. iMac G5
3  *
4  * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
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 
153 /*
154  * ****** System Fans Control Loop ******
155  *
156  */
157 
158 /* Parameters for the System Fans control loop. Parameters
159  * not in this table such as interval, history size, ...
160  * are common to all versions and thus hard coded for now.
161  */
163  int model_id;
165  s32 gd, gp, gr;
166 
171 };
172 
173 #define WF_SMU_SYS_FANS_INTERVAL 5
174 #define WF_SMU_SYS_FANS_HISTORY_SIZE 2
175 
176 /* State data used by the system fans control loop
177  */
179  int ticks;
187 };
188 
189 /*
190  * Configs for SMU System Fan control loop
191  */
192 static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
193  /* Model ID 2 */
194  {
195  .model_id = 2,
196  .itarget = 0x3a0000,
197  .gd = 0x15400000,
198  .gp = 0x00200000,
199  .gr = 0x000002fd,
200  .offset0 = 0xff38,
201  .scale0 = 0x0ccd,
202  .offset1 = 0x0208,
203  .scale1 = 0x07ae,
204  },
205  /* Model ID 3 */
206  {
207  .model_id = 3,
208  .itarget = 0x350000,
209  .gd = 0x08e00000,
210  .gp = 0x00566666,
211  .gr = 0x0000072b,
212  .offset0 = 0xff38,
213  .scale0 = 0x0ccd,
214  .offset1 = 0x0000,
215  .scale1 = 0x0000,
216  },
217  /* Model ID 5 */
218  {
219  .model_id = 5,
220  .itarget = 0x3a0000,
221  .gd = 0x15400000,
222  .gp = 0x00233333,
223  .gr = 0x000002fd,
224  .offset0 = 0x0000,
225  .scale0 = 0x1000,
226  .offset1 = 0x0091,
227  .scale1 = 0x0bae,
228  },
229 };
230 #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
231 
232 static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
233 
234 /*
235  * ****** CPU Fans Control Loop ******
236  *
237  */
238 
239 
240 #define WF_SMU_CPU_FANS_INTERVAL 1
241 #define WF_SMU_CPU_FANS_MAX_HISTORY 16
242 #define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000
243 #define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50
244 
245 /* State data used by the cpu fans control loop
246  */
248  int ticks;
253 };
254 
255 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
256 
257 
258 
259 /*
260  * ***** Implementation *****
261  *
262  */
263 
264 static void wf_smu_create_sys_fans(void)
265 {
266  struct wf_smu_sys_fans_param *param = NULL;
267  struct wf_pid_param pid_param;
268  int i;
269 
270  /* First, locate the params for this model */
271  for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
272  if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
273  param = &wf_smu_sys_all_params[i];
274  break;
275  }
276 
277  /* No params found, put fans to max */
278  if (param == NULL) {
279  printk(KERN_WARNING "windfarm: System fan config not found "
280  "for this machine model, max fan speed\n");
281  goto fail;
282  }
283 
284  /* Alloc & initialize state */
285  wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
286  GFP_KERNEL);
287  if (wf_smu_sys_fans == NULL) {
288  printk(KERN_WARNING "windfarm: Memory allocation error"
289  " max fan speed\n");
290  goto fail;
291  }
292  wf_smu_sys_fans->ticks = 1;
293  wf_smu_sys_fans->scale0 = param->scale0;
294  wf_smu_sys_fans->offset0 = param->offset0;
295  wf_smu_sys_fans->scale1 = param->scale1;
296  wf_smu_sys_fans->offset1 = param->offset1;
297 
298  /* Fill PID params */
299  pid_param.gd = param->gd;
300  pid_param.gp = param->gp;
301  pid_param.gr = param->gr;
302  pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
303  pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
304  pid_param.itarget = param->itarget;
305  pid_param.min = wf_control_get_min(fan_system);
306  pid_param.max = wf_control_get_max(fan_system);
307  if (fan_hd) {
308  pid_param.min =
309  max(pid_param.min, wf_control_get_min(fan_hd));
310  pid_param.max =
311  min(pid_param.max, wf_control_get_max(fan_hd));
312  }
313  wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
314 
315  DBG("wf: System Fan control initialized.\n");
316  DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
317  FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
318  return;
319 
320  fail:
321 
322  if (fan_system)
323  wf_control_set_max(fan_system);
324  if (fan_hd)
325  wf_control_set_max(fan_hd);
326 }
327 
328 static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
329 {
330  s32 new_setpoint, temp, scaled, cputarget;
331  int rc;
332 
333  if (--st->ticks != 0) {
334  if (wf_smu_readjust)
335  goto readjust;
336  return;
337  }
339 
340  rc = wf_sensor_get(sensor_hd_temp, &temp);
341  if (rc) {
342  printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
343  rc);
344  wf_smu_failure_state |= FAILURE_SENSOR;
345  return;
346  }
347 
348  DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
349  FIX32TOPRINT(temp));
350 
351  if (temp > (st->pid.param.itarget + 0x50000))
352  wf_smu_failure_state |= FAILURE_OVERTEMP;
353 
354  new_setpoint = wf_pid_run(&st->pid, temp);
355 
356  DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
357 
358  scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
359 
360  DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
361 
362  cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
363  cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
364  scaled = max(scaled, cputarget);
365  scaled = max(scaled, st->pid.param.min);
366  scaled = min(scaled, st->pid.param.max);
367 
368  DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
369 
370  if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
371  return;
372  st->sys_setpoint = scaled;
373  st->hd_setpoint = new_setpoint;
374  readjust:
375  if (fan_system && wf_smu_failure_state == 0) {
376  rc = wf_control_set(fan_system, st->sys_setpoint);
377  if (rc) {
378  printk(KERN_WARNING "windfarm: Sys fan error %d\n",
379  rc);
380  wf_smu_failure_state |= FAILURE_FAN;
381  }
382  }
383  if (fan_hd && wf_smu_failure_state == 0) {
384  rc = wf_control_set(fan_hd, st->hd_setpoint);
385  if (rc) {
386  printk(KERN_WARNING "windfarm: HD fan error %d\n",
387  rc);
388  wf_smu_failure_state |= FAILURE_FAN;
389  }
390  }
391 }
392 
393 static void wf_smu_create_cpu_fans(void)
394 {
395  struct wf_cpu_pid_param pid_param;
396  const struct smu_sdbp_header *hdr;
397  struct smu_sdbp_cpupiddata *piddata;
398  struct smu_sdbp_fvt *fvt;
399  s32 tmax, tdelta, maxpow, powadj;
400 
401  /* First, locate the PID params in SMU SBD */
403  if (hdr == 0) {
404  printk(KERN_WARNING "windfarm: CPU PID fan config not found "
405  "max fan speed\n");
406  goto fail;
407  }
408  piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
409 
410  /* Get the FVT params for operating point 0 (the only supported one
411  * for now) in order to get tmax
412  */
414  if (hdr) {
415  fvt = (struct smu_sdbp_fvt *)&hdr[1];
416  tmax = ((s32)fvt->maxtemp) << 16;
417  } else
418  tmax = 0x5e0000; /* 94 degree default */
419 
420  /* Alloc & initialize state */
421  wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
422  GFP_KERNEL);
423  if (wf_smu_cpu_fans == NULL)
424  goto fail;
425  wf_smu_cpu_fans->ticks = 1;
426 
427  wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
428  wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
429 
430  /* Fill PID params */
431  pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
432  pid_param.history_len = piddata->history_len;
433  if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
434  printk(KERN_WARNING "windfarm: History size overflow on "
435  "CPU control loop (%d)\n", piddata->history_len);
436  pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
437  }
438  pid_param.gd = piddata->gd;
439  pid_param.gp = piddata->gp;
440  pid_param.gr = piddata->gr / pid_param.history_len;
441 
442  tdelta = ((s32)piddata->target_temp_delta) << 16;
443  maxpow = ((s32)piddata->max_power) << 16;
444  powadj = ((s32)piddata->power_adj) << 16;
445 
446  pid_param.tmax = tmax;
447  pid_param.ttarget = tmax - tdelta;
448  pid_param.pmaxadj = maxpow - powadj;
449 
450  pid_param.min = wf_control_get_min(fan_cpu_main);
451  pid_param.max = wf_control_get_max(fan_cpu_main);
452 
453  wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
454 
455  DBG("wf: CPU Fan control initialized.\n");
456  DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
457  FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
458  pid_param.min, pid_param.max);
459 
460  return;
461 
462  fail:
463  printk(KERN_WARNING "windfarm: CPU fan config not found\n"
464  "for this machine model, max fan speed\n");
465 
466  if (cpufreq_clamp)
467  wf_control_set_max(cpufreq_clamp);
468  if (fan_cpu_main)
469  wf_control_set_max(fan_cpu_main);
470 }
471 
472 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
473 {
474  s32 new_setpoint, temp, power, systarget;
475  int rc;
476 
477  if (--st->ticks != 0) {
478  if (wf_smu_readjust)
479  goto readjust;
480  return;
481  }
483 
484  rc = wf_sensor_get(sensor_cpu_temp, &temp);
485  if (rc) {
486  printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
487  rc);
488  wf_smu_failure_state |= FAILURE_SENSOR;
489  return;
490  }
491 
492  rc = wf_sensor_get(sensor_cpu_power, &power);
493  if (rc) {
494  printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
495  rc);
496  wf_smu_failure_state |= FAILURE_SENSOR;
497  return;
498  }
499 
500  DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
501  FIX32TOPRINT(temp), FIX32TOPRINT(power));
502 
503 #ifdef HACKED_OVERTEMP
504  if (temp > 0x4a0000)
505  wf_smu_failure_state |= FAILURE_OVERTEMP;
506 #else
507  if (temp > st->pid.param.tmax)
508  wf_smu_failure_state |= FAILURE_OVERTEMP;
509 #endif
510  new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
511 
512  DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
513 
514  systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
515  systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
516  + st->offset;
517  new_setpoint = max(new_setpoint, systarget);
518  new_setpoint = max(new_setpoint, st->pid.param.min);
519  new_setpoint = min(new_setpoint, st->pid.param.max);
520 
521  DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
522 
523  if (st->cpu_setpoint == new_setpoint)
524  return;
525  st->cpu_setpoint = new_setpoint;
526  readjust:
527  if (fan_cpu_main && wf_smu_failure_state == 0) {
528  rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
529  if (rc) {
530  printk(KERN_WARNING "windfarm: CPU main fan"
531  " error %d\n", rc);
532  wf_smu_failure_state |= FAILURE_FAN;
533  }
534  }
535 }
536 
537 /*
538  * ****** Setup / Init / Misc ... ******
539  *
540  */
541 
542 static void wf_smu_tick(void)
543 {
544  unsigned int last_failure = wf_smu_failure_state;
545  unsigned int new_failure;
546 
547  if (!wf_smu_started) {
548  DBG("wf: creating control loops !\n");
549  wf_smu_create_sys_fans();
550  wf_smu_create_cpu_fans();
551  wf_smu_started = 1;
552  }
553 
554  /* Skipping ticks */
555  if (wf_smu_skipping && --wf_smu_skipping)
556  return;
557 
558  wf_smu_failure_state = 0;
559  if (wf_smu_sys_fans)
560  wf_smu_sys_fans_tick(wf_smu_sys_fans);
561  if (wf_smu_cpu_fans)
562  wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
563 
564  wf_smu_readjust = 0;
565  new_failure = wf_smu_failure_state & ~last_failure;
566 
567  /* If entering failure mode, clamp cpufreq and ramp all
568  * fans to full speed.
569  */
570  if (wf_smu_failure_state && !last_failure) {
571  if (cpufreq_clamp)
572  wf_control_set_max(cpufreq_clamp);
573  if (fan_system)
574  wf_control_set_max(fan_system);
575  if (fan_cpu_main)
576  wf_control_set_max(fan_cpu_main);
577  if (fan_hd)
578  wf_control_set_max(fan_hd);
579  }
580 
581  /* If leaving failure mode, unclamp cpufreq and readjust
582  * all fans on next iteration
583  */
584  if (!wf_smu_failure_state && last_failure) {
585  if (cpufreq_clamp)
586  wf_control_set_min(cpufreq_clamp);
587  wf_smu_readjust = 1;
588  }
589 
590  /* Overtemp condition detected, notify and start skipping a couple
591  * ticks to let the temperature go down
592  */
593  if (new_failure & FAILURE_OVERTEMP) {
594  wf_set_overtemp();
595  wf_smu_skipping = 2;
596  }
597 
598  /* We only clear the overtemp condition if overtemp is cleared
599  * _and_ no other failure is present. Since a sensor error will
600  * clear the overtemp condition (can't measure temperature) at
601  * the control loop levels, but we don't want to keep it clear
602  * here in this case
603  */
604  if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
606 }
607 
608 static void wf_smu_new_control(struct wf_control *ct)
609 {
610  if (wf_smu_all_controls_ok)
611  return;
612 
613  if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
614  if (wf_get_control(ct) == 0)
615  fan_cpu_main = ct;
616  }
617 
618  if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
619  if (wf_get_control(ct) == 0)
620  fan_system = ct;
621  }
622 
623  if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
624  if (wf_get_control(ct) == 0)
625  cpufreq_clamp = ct;
626  }
627 
628  /* Darwin property list says the HD fan is only for model ID
629  * 0, 1, 2 and 3
630  */
631 
632  if (wf_smu_mach_model > 3) {
633  if (fan_system && fan_cpu_main && cpufreq_clamp)
634  wf_smu_all_controls_ok = 1;
635  return;
636  }
637 
638  if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
639  if (wf_get_control(ct) == 0)
640  fan_hd = ct;
641  }
642 
643  if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
644  wf_smu_all_controls_ok = 1;
645 }
646 
647 static void wf_smu_new_sensor(struct wf_sensor *sr)
648 {
649  if (wf_smu_all_sensors_ok)
650  return;
651 
652  if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
653  if (wf_get_sensor(sr) == 0)
654  sensor_cpu_power = sr;
655  }
656 
657  if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
658  if (wf_get_sensor(sr) == 0)
659  sensor_cpu_temp = sr;
660  }
661 
662  if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
663  if (wf_get_sensor(sr) == 0)
664  sensor_hd_temp = sr;
665  }
666 
667  if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
668  wf_smu_all_sensors_ok = 1;
669 }
670 
671 
672 static int wf_smu_notify(struct notifier_block *self,
673  unsigned long event, void *data)
674 {
675  switch(event) {
677  DBG("wf: new control %s detected\n",
678  ((struct wf_control *)data)->name);
679  wf_smu_new_control(data);
680  wf_smu_readjust = 1;
681  break;
682  case WF_EVENT_NEW_SENSOR:
683  DBG("wf: new sensor %s detected\n",
684  ((struct wf_sensor *)data)->name);
685  wf_smu_new_sensor(data);
686  break;
687  case WF_EVENT_TICK:
688  if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
689  wf_smu_tick();
690  }
691 
692  return 0;
693 }
694 
695 static struct notifier_block wf_smu_events = {
696  .notifier_call = wf_smu_notify,
697 };
698 
699 static int wf_init_pm(void)
700 {
701  const struct smu_sdbp_header *hdr;
702 
704  if (hdr != 0) {
705  struct smu_sdbp_sensortree *st =
706  (struct smu_sdbp_sensortree *)&hdr[1];
707  wf_smu_mach_model = st->model_id;
708  }
709 
710  printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
711  wf_smu_mach_model);
712 
713  return 0;
714 }
715 
716 static int wf_smu_probe(struct platform_device *ddev)
717 {
718  wf_register_client(&wf_smu_events);
719 
720  return 0;
721 }
722 
723 static int __devexit wf_smu_remove(struct platform_device *ddev)
724 {
725  wf_unregister_client(&wf_smu_events);
726 
727  /* XXX We don't have yet a guarantee that our callback isn't
728  * in progress when returning from wf_unregister_client, so
729  * we add an arbitrary delay. I'll have to fix that in the core
730  */
731  msleep(1000);
732 
733  /* Release all sensors */
734  /* One more crappy race: I don't think we have any guarantee here
735  * that the attribute callback won't race with the sensor beeing
736  * disposed of, and I'm not 100% certain what best way to deal
737  * with that except by adding locks all over... I'll do that
738  * eventually but heh, who ever rmmod this module anyway ?
739  */
740  if (sensor_cpu_power)
741  wf_put_sensor(sensor_cpu_power);
742  if (sensor_cpu_temp)
743  wf_put_sensor(sensor_cpu_temp);
744  if (sensor_hd_temp)
745  wf_put_sensor(sensor_hd_temp);
746 
747  /* Release all controls */
748  if (fan_cpu_main)
749  wf_put_control(fan_cpu_main);
750  if (fan_hd)
751  wf_put_control(fan_hd);
752  if (fan_system)
753  wf_put_control(fan_system);
754  if (cpufreq_clamp)
755  wf_put_control(cpufreq_clamp);
756 
757  /* Destroy control loops state structures */
758  kfree(wf_smu_sys_fans);
759  kfree(wf_smu_cpu_fans);
760 
761  return 0;
762 }
763 
764 static struct platform_driver wf_smu_driver = {
765  .probe = wf_smu_probe,
766  .remove = __devexit_p(wf_smu_remove),
767  .driver = {
768  .name = "windfarm",
769  .owner = THIS_MODULE,
770  },
771 };
772 
773 
774 static int __init wf_smu_init(void)
775 {
776  int rc = -ENODEV;
777 
778  if (of_machine_is_compatible("PowerMac8,1") ||
779  of_machine_is_compatible("PowerMac8,2"))
780  rc = wf_init_pm();
781 
782  if (rc == 0) {
783 #ifdef MODULE
784  request_module("windfarm_smu_controls");
785  request_module("windfarm_smu_sensors");
786  request_module("windfarm_lm75_sensor");
787  request_module("windfarm_cpufreq_clamp");
788 
789 #endif /* MODULE */
790  platform_driver_register(&wf_smu_driver);
791  }
792 
793  return rc;
794 }
795 
796 static void __exit wf_smu_exit(void)
797 {
798 
799  platform_driver_unregister(&wf_smu_driver);
800 }
801 
802 
803 module_init(wf_smu_init);
804 module_exit(wf_smu_exit);
805 
806 MODULE_AUTHOR("Benjamin Herrenschmidt <[email protected]>");
807 MODULE_DESCRIPTION("Thermal control logic for iMac G5");
808 MODULE_LICENSE("GPL");
809 MODULE_ALIAS("platform:windfarm");