Pull context-bitmap into release branch
[linux-2.6] / 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 retreived,
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 static struct device *wf_smu_dev;
135
136 /* Controls & sensors */
137 static struct wf_sensor *sensor_cpu_power;
138 static struct wf_sensor *sensor_cpu_temp;
139 static struct wf_sensor *sensor_hd_temp;
140 static struct wf_control *fan_cpu_main;
141 static struct wf_control *fan_hd;
142 static struct wf_control *fan_system;
143 static struct wf_control *cpufreq_clamp;
144
145 /* Set to kick the control loop into life */
146 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
147
148 /* Failure handling.. could be nicer */
149 #define FAILURE_FAN             0x01
150 #define FAILURE_SENSOR          0x02
151 #define FAILURE_OVERTEMP        0x04
152
153 static unsigned int wf_smu_failure_state;
154 static int wf_smu_readjust, wf_smu_skipping;
155
156 /*
157  * ****** System Fans Control Loop ******
158  *
159  */
160
161 /* Parameters for the System Fans control loop. Parameters
162  * not in this table such as interval, history size, ...
163  * are common to all versions and thus hard coded for now.
164  */
165 struct wf_smu_sys_fans_param {
166         int     model_id;
167         s32     itarget;
168         s32     gd, gp, gr;
169
170         s16     offset0;
171         u16     scale0;
172         s16     offset1;
173         u16     scale1;
174 };
175
176 #define WF_SMU_SYS_FANS_INTERVAL        5
177 #define WF_SMU_SYS_FANS_HISTORY_SIZE    2
178
179 /* State data used by the system fans control loop
180  */
181 struct wf_smu_sys_fans_state {
182         int                     ticks;
183         s32                     sys_setpoint;
184         s32                     hd_setpoint;
185         s16                     offset0;
186         u16                     scale0;
187         s16                     offset1;
188         u16                     scale1;
189         struct wf_pid_state     pid;
190 };
191
192 /*
193  * Configs for SMU Sytem Fan control loop
194  */
195 static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
196         /* Model ID 2 */
197         {
198                 .model_id       = 2,
199                 .itarget        = 0x3a0000,
200                 .gd             = 0x15400000,
201                 .gp             = 0x00200000,
202                 .gr             = 0x000002fd,
203                 .offset0        = 0xff38,
204                 .scale0         = 0x0ccd,
205                 .offset1        = 0x0208,
206                 .scale1         = 0x07ae,
207         },
208         /* Model ID 3 */
209         {
210                 .model_id       = 2,
211                 .itarget        = 0x350000,
212                 .gd             = 0x08e00000,
213                 .gp             = 0x00566666,
214                 .gr             = 0x0000072b,
215                 .offset0        = 0xff38,
216                 .scale0         = 0x0ccd,
217                 .offset1        = 0x0000,
218                 .scale1         = 0x0000,
219         },
220         /* Model ID 5 */
221         {
222                 .model_id       = 2,
223                 .itarget        = 0x3a0000,
224                 .gd             = 0x15400000,
225                 .gp             = 0x00233333,
226                 .gr             = 0x000002fd,
227                 .offset0        = 0x0000,
228                 .scale0         = 0x1000,
229                 .offset1        = 0x0091,
230                 .scale1         = 0x0bae,
231         },
232 };
233 #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
234
235 static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
236
237 /*
238  * ****** CPU Fans Control Loop ******
239  *
240  */
241
242
243 #define WF_SMU_CPU_FANS_INTERVAL        1
244 #define WF_SMU_CPU_FANS_MAX_HISTORY     16
245 #define WF_SMU_CPU_FANS_SIBLING_SCALE   0x00001000
246 #define WF_SMU_CPU_FANS_SIBLING_OFFSET  0xfffffb50
247
248 /* State data used by the cpu fans control loop
249  */
250 struct wf_smu_cpu_fans_state {
251         int                     ticks;
252         s32                     cpu_setpoint;
253         s32                     scale;
254         s32                     offset;
255         struct wf_cpu_pid_state pid;
256 };
257
258 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
259
260
261
262 /*
263  * ***** Implementation *****
264  *
265  */
266
267 static void wf_smu_create_sys_fans(void)
268 {
269         struct wf_smu_sys_fans_param *param = NULL;
270         struct wf_pid_param pid_param;
271         int i;
272
273         /* First, locate the params for this model */
274         for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
275                 if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
276                         param = &wf_smu_sys_all_params[i];
277                         break;
278                 }
279
280         /* No params found, put fans to max */
281         if (param == NULL) {
282                 printk(KERN_WARNING "windfarm: System fan config not found "
283                        "for this machine model, max fan speed\n");
284                 goto fail;
285         }
286
287         /* Alloc & initialize state */
288         wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
289                                   GFP_KERNEL);
290         if (wf_smu_sys_fans == NULL) {
291                 printk(KERN_WARNING "windfarm: Memory allocation error"
292                        " max fan speed\n");
293                 goto fail;
294         }
295         wf_smu_sys_fans->ticks = 1;
296         wf_smu_sys_fans->scale0 = param->scale0;
297         wf_smu_sys_fans->offset0 = param->offset0;
298         wf_smu_sys_fans->scale1 = param->scale1;
299         wf_smu_sys_fans->offset1 = param->offset1;
300
301         /* Fill PID params */
302         pid_param.gd = param->gd;
303         pid_param.gp = param->gp;
304         pid_param.gr = param->gr;
305         pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
306         pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
307         pid_param.itarget = param->itarget;
308         pid_param.min = fan_system->ops->get_min(fan_system);
309         pid_param.max = fan_system->ops->get_max(fan_system);
310         if (fan_hd) {
311                 pid_param.min =
312                         max(pid_param.min,fan_hd->ops->get_min(fan_hd));
313                 pid_param.max =
314                         min(pid_param.max,fan_hd->ops->get_max(fan_hd));
315         }
316         wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
317
318         DBG("wf: System Fan control initialized.\n");
319         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
320             FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
321         return;
322
323  fail:
324
325         if (fan_system)
326                 wf_control_set_max(fan_system);
327         if (fan_hd)
328                 wf_control_set_max(fan_hd);
329 }
330
331 static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
332 {
333         s32 new_setpoint, temp, scaled, cputarget;
334         int rc;
335
336         if (--st->ticks != 0) {
337                 if (wf_smu_readjust)
338                         goto readjust;
339                 return;
340         }
341         st->ticks = WF_SMU_SYS_FANS_INTERVAL;
342
343         rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
344         if (rc) {
345                 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
346                        rc);
347                 wf_smu_failure_state |= FAILURE_SENSOR;
348                 return;
349         }
350
351         DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
352             FIX32TOPRINT(temp));
353
354         if (temp > (st->pid.param.itarget + 0x50000))
355                 wf_smu_failure_state |= FAILURE_OVERTEMP;
356
357         new_setpoint = wf_pid_run(&st->pid, temp);
358
359         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
360
361         scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
362
363         DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
364
365         cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
366         cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
367         scaled = max(scaled, cputarget);
368         scaled = max(scaled, st->pid.param.min);
369         scaled = min(scaled, st->pid.param.max);
370
371         DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
372
373         if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
374                 return;
375         st->sys_setpoint = scaled;
376         st->hd_setpoint = new_setpoint;
377  readjust:
378         if (fan_system && wf_smu_failure_state == 0) {
379                 rc = fan_system->ops->set_value(fan_system, st->sys_setpoint);
380                 if (rc) {
381                         printk(KERN_WARNING "windfarm: Sys fan error %d\n",
382                                rc);
383                         wf_smu_failure_state |= FAILURE_FAN;
384                 }
385         }
386         if (fan_hd && wf_smu_failure_state == 0) {
387                 rc = fan_hd->ops->set_value(fan_hd, st->hd_setpoint);
388                 if (rc) {
389                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
390                                rc);
391                         wf_smu_failure_state |= FAILURE_FAN;
392                 }
393         }
394 }
395
396 static void wf_smu_create_cpu_fans(void)
397 {
398         struct wf_cpu_pid_param pid_param;
399         struct smu_sdbp_header *hdr;
400         struct smu_sdbp_cpupiddata *piddata;
401         struct smu_sdbp_fvt *fvt;
402         s32 tmax, tdelta, maxpow, powadj;
403
404         /* First, locate the PID params in SMU SBD */
405         hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
406         if (hdr == 0) {
407                 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
408                        "max fan speed\n");
409                 goto fail;
410         }
411         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
412
413         /* Get the FVT params for operating point 0 (the only supported one
414          * for now) in order to get tmax
415          */
416         hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
417         if (hdr) {
418                 fvt = (struct smu_sdbp_fvt *)&hdr[1];
419                 tmax = ((s32)fvt->maxtemp) << 16;
420         } else
421                 tmax = 0x5e0000; /* 94 degree default */
422
423         /* Alloc & initialize state */
424         wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
425                                   GFP_KERNEL);
426         if (wf_smu_cpu_fans == NULL)
427                 goto fail;
428         wf_smu_cpu_fans->ticks = 1;
429
430         wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
431         wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
432
433         /* Fill PID params */
434         pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
435         pid_param.history_len = piddata->history_len;
436         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
437                 printk(KERN_WARNING "windfarm: History size overflow on "
438                        "CPU control loop (%d)\n", piddata->history_len);
439                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
440         }
441         pid_param.gd = piddata->gd;
442         pid_param.gp = piddata->gp;
443         pid_param.gr = piddata->gr / pid_param.history_len;
444
445         tdelta = ((s32)piddata->target_temp_delta) << 16;
446         maxpow = ((s32)piddata->max_power) << 16;
447         powadj = ((s32)piddata->power_adj) << 16;
448
449         pid_param.tmax = tmax;
450         pid_param.ttarget = tmax - tdelta;
451         pid_param.pmaxadj = maxpow - powadj;
452
453         pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
454         pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);
455
456         wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
457
458         DBG("wf: CPU Fan control initialized.\n");
459         DBG("    ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
460             FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
461             pid_param.min, pid_param.max);
462
463         return;
464
465  fail:
466         printk(KERN_WARNING "windfarm: CPU fan config not found\n"
467                "for this machine model, max fan speed\n");
468
469         if (cpufreq_clamp)
470                 wf_control_set_max(cpufreq_clamp);
471         if (fan_cpu_main)
472                 wf_control_set_max(fan_cpu_main);
473 }
474
475 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
476 {
477         s32 new_setpoint, temp, power, systarget;
478         int rc;
479
480         if (--st->ticks != 0) {
481                 if (wf_smu_readjust)
482                         goto readjust;
483                 return;
484         }
485         st->ticks = WF_SMU_CPU_FANS_INTERVAL;
486
487         rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
488         if (rc) {
489                 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
490                        rc);
491                 wf_smu_failure_state |= FAILURE_SENSOR;
492                 return;
493         }
494
495         rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
496         if (rc) {
497                 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
498                        rc);
499                 wf_smu_failure_state |= FAILURE_SENSOR;
500                 return;
501         }
502
503         DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
504             FIX32TOPRINT(temp), FIX32TOPRINT(power));
505
506 #ifdef HACKED_OVERTEMP
507         if (temp > 0x4a0000)
508                 wf_smu_failure_state |= FAILURE_OVERTEMP;
509 #else
510         if (temp > st->pid.param.tmax)
511                 wf_smu_failure_state |= FAILURE_OVERTEMP;
512 #endif
513         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
514
515         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
516
517         systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
518         systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
519                 + st->offset;
520         new_setpoint = max(new_setpoint, systarget);
521         new_setpoint = max(new_setpoint, st->pid.param.min);
522         new_setpoint = min(new_setpoint, st->pid.param.max);
523
524         DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
525
526         if (st->cpu_setpoint == new_setpoint)
527                 return;
528         st->cpu_setpoint = new_setpoint;
529  readjust:
530         if (fan_cpu_main && wf_smu_failure_state == 0) {
531                 rc = fan_cpu_main->ops->set_value(fan_cpu_main,
532                                                   st->cpu_setpoint);
533                 if (rc) {
534                         printk(KERN_WARNING "windfarm: CPU main fan"
535                                " error %d\n", rc);
536                         wf_smu_failure_state |= FAILURE_FAN;
537                 }
538         }
539 }
540
541
542 /*
543  * ****** Attributes ******
544  *
545  */
546
547 #define BUILD_SHOW_FUNC_FIX(name, data)                         \
548 static ssize_t show_##name(struct device *dev,                  \
549                            struct device_attribute *attr,       \
550                            char *buf)                           \
551 {                                                               \
552         ssize_t r;                                              \
553         s32 val = 0;                                            \
554         data->ops->get_value(data, &val);                       \
555         r = sprintf(buf, "%d.%03d", FIX32TOPRINT(val));         \
556         return r;                                               \
557 }                                                               \
558 static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL);
559
560
561 #define BUILD_SHOW_FUNC_INT(name, data)                         \
562 static ssize_t show_##name(struct device *dev,                  \
563                            struct device_attribute *attr,       \
564                            char *buf)                           \
565 {                                                               \
566         s32 val = 0;                                            \
567         data->ops->get_value(data, &val);                       \
568         return sprintf(buf, "%d", val);                         \
569 }                                                               \
570 static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL);
571
572 BUILD_SHOW_FUNC_INT(cpu_fan, fan_cpu_main);
573 BUILD_SHOW_FUNC_INT(sys_fan, fan_system);
574 BUILD_SHOW_FUNC_INT(hd_fan, fan_hd);
575
576 BUILD_SHOW_FUNC_FIX(cpu_temp, sensor_cpu_temp);
577 BUILD_SHOW_FUNC_FIX(cpu_power, sensor_cpu_power);
578 BUILD_SHOW_FUNC_FIX(hd_temp, sensor_hd_temp);
579
580 /*
581  * ****** Setup / Init / Misc ... ******
582  *
583  */
584
585 static void wf_smu_tick(void)
586 {
587         unsigned int last_failure = wf_smu_failure_state;
588         unsigned int new_failure;
589
590         if (!wf_smu_started) {
591                 DBG("wf: creating control loops !\n");
592                 wf_smu_create_sys_fans();
593                 wf_smu_create_cpu_fans();
594                 wf_smu_started = 1;
595         }
596
597         /* Skipping ticks */
598         if (wf_smu_skipping && --wf_smu_skipping)
599                 return;
600
601         wf_smu_failure_state = 0;
602         if (wf_smu_sys_fans)
603                 wf_smu_sys_fans_tick(wf_smu_sys_fans);
604         if (wf_smu_cpu_fans)
605                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
606
607         wf_smu_readjust = 0;
608         new_failure = wf_smu_failure_state & ~last_failure;
609
610         /* If entering failure mode, clamp cpufreq and ramp all
611          * fans to full speed.
612          */
613         if (wf_smu_failure_state && !last_failure) {
614                 if (cpufreq_clamp)
615                         wf_control_set_max(cpufreq_clamp);
616                 if (fan_system)
617                         wf_control_set_max(fan_system);
618                 if (fan_cpu_main)
619                         wf_control_set_max(fan_cpu_main);
620                 if (fan_hd)
621                         wf_control_set_max(fan_hd);
622         }
623
624         /* If leaving failure mode, unclamp cpufreq and readjust
625          * all fans on next iteration
626          */
627         if (!wf_smu_failure_state && last_failure) {
628                 if (cpufreq_clamp)
629                         wf_control_set_min(cpufreq_clamp);
630                 wf_smu_readjust = 1;
631         }
632
633         /* Overtemp condition detected, notify and start skipping a couple
634          * ticks to let the temperature go down
635          */
636         if (new_failure & FAILURE_OVERTEMP) {
637                 wf_set_overtemp();
638                 wf_smu_skipping = 2;
639         }
640
641         /* We only clear the overtemp condition if overtemp is cleared
642          * _and_ no other failure is present. Since a sensor error will
643          * clear the overtemp condition (can't measure temperature) at
644          * the control loop levels, but we don't want to keep it clear
645          * here in this case
646          */
647         if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
648                 wf_clear_overtemp();
649 }
650
651 static void wf_smu_new_control(struct wf_control *ct)
652 {
653         if (wf_smu_all_controls_ok)
654                 return;
655
656         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
657                 if (wf_get_control(ct) == 0) {
658                         fan_cpu_main = ct;
659                         device_create_file(wf_smu_dev, &dev_attr_cpu_fan);
660                 }
661         }
662
663         if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
664                 if (wf_get_control(ct) == 0) {
665                         fan_system = ct;
666                         device_create_file(wf_smu_dev, &dev_attr_sys_fan);
667                 }
668         }
669
670         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
671                 if (wf_get_control(ct) == 0)
672                         cpufreq_clamp = ct;
673         }
674
675         /* Darwin property list says the HD fan is only for model ID
676          * 0, 1, 2 and 3
677          */
678
679         if (wf_smu_mach_model > 3) {
680                 if (fan_system && fan_cpu_main && cpufreq_clamp)
681                         wf_smu_all_controls_ok = 1;
682                 return;
683         }
684
685         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
686                 if (wf_get_control(ct) == 0) {
687                         fan_hd = ct;
688                         device_create_file(wf_smu_dev, &dev_attr_hd_fan);
689                 }
690         }
691
692         if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
693                 wf_smu_all_controls_ok = 1;
694 }
695
696 static void wf_smu_new_sensor(struct wf_sensor *sr)
697 {
698         if (wf_smu_all_sensors_ok)
699                 return;
700
701         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
702                 if (wf_get_sensor(sr) == 0) {
703                         sensor_cpu_power = sr;
704                         device_create_file(wf_smu_dev, &dev_attr_cpu_power);
705                 }
706         }
707
708         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
709                 if (wf_get_sensor(sr) == 0) {
710                         sensor_cpu_temp = sr;
711                         device_create_file(wf_smu_dev, &dev_attr_cpu_temp);
712                 }
713         }
714
715         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
716                 if (wf_get_sensor(sr) == 0) {
717                         sensor_hd_temp = sr;
718                         device_create_file(wf_smu_dev, &dev_attr_hd_temp);
719                 }
720         }
721
722         if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
723                 wf_smu_all_sensors_ok = 1;
724 }
725
726
727 static int wf_smu_notify(struct notifier_block *self,
728                                unsigned long event, void *data)
729 {
730         switch(event) {
731         case WF_EVENT_NEW_CONTROL:
732                 DBG("wf: new control %s detected\n",
733                     ((struct wf_control *)data)->name);
734                 wf_smu_new_control(data);
735                 wf_smu_readjust = 1;
736                 break;
737         case WF_EVENT_NEW_SENSOR:
738                 DBG("wf: new sensor %s detected\n",
739                     ((struct wf_sensor *)data)->name);
740                 wf_smu_new_sensor(data);
741                 break;
742         case WF_EVENT_TICK:
743                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
744                         wf_smu_tick();
745         }
746
747         return 0;
748 }
749
750 static struct notifier_block wf_smu_events = {
751         .notifier_call  = wf_smu_notify,
752 };
753
754 static int wf_init_pm(void)
755 {
756         struct smu_sdbp_header *hdr;
757
758         hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
759         if (hdr != 0) {
760                 struct smu_sdbp_sensortree *st =
761                         (struct smu_sdbp_sensortree *)&hdr[1];
762                 wf_smu_mach_model = st->model_id;
763         }
764
765         printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
766                wf_smu_mach_model);
767
768         return 0;
769 }
770
771 static int wf_smu_probe(struct device *ddev)
772 {
773         wf_smu_dev = ddev;
774
775         wf_register_client(&wf_smu_events);
776
777         return 0;
778 }
779
780 static int wf_smu_remove(struct device *ddev)
781 {
782         wf_unregister_client(&wf_smu_events);
783
784         /* XXX We don't have yet a guarantee that our callback isn't
785          * in progress when returning from wf_unregister_client, so
786          * we add an arbitrary delay. I'll have to fix that in the core
787          */
788         msleep(1000);
789
790         /* Release all sensors */
791         /* One more crappy race: I don't think we have any guarantee here
792          * that the attribute callback won't race with the sensor beeing
793          * disposed of, and I'm not 100% certain what best way to deal
794          * with that except by adding locks all over... I'll do that
795          * eventually but heh, who ever rmmod this module anyway ?
796          */
797         if (sensor_cpu_power) {
798                 device_remove_file(wf_smu_dev, &dev_attr_cpu_power);
799                 wf_put_sensor(sensor_cpu_power);
800         }
801         if (sensor_cpu_temp) {
802                 device_remove_file(wf_smu_dev, &dev_attr_cpu_temp);
803                 wf_put_sensor(sensor_cpu_temp);
804         }
805         if (sensor_hd_temp) {
806                 device_remove_file(wf_smu_dev, &dev_attr_hd_temp);
807                 wf_put_sensor(sensor_hd_temp);
808         }
809
810         /* Release all controls */
811         if (fan_cpu_main) {
812                 device_remove_file(wf_smu_dev, &dev_attr_cpu_fan);
813                 wf_put_control(fan_cpu_main);
814         }
815         if (fan_hd) {
816                 device_remove_file(wf_smu_dev, &dev_attr_hd_fan);
817                 wf_put_control(fan_hd);
818         }
819         if (fan_system) {
820                 device_remove_file(wf_smu_dev, &dev_attr_sys_fan);
821                 wf_put_control(fan_system);
822         }
823         if (cpufreq_clamp)
824                 wf_put_control(cpufreq_clamp);
825
826         /* Destroy control loops state structures */
827         if (wf_smu_sys_fans)
828                 kfree(wf_smu_sys_fans);
829         if (wf_smu_cpu_fans)
830                 kfree(wf_smu_cpu_fans);
831
832         wf_smu_dev = NULL;
833
834         return 0;
835 }
836
837 static struct device_driver wf_smu_driver = {
838         .name = "windfarm",
839         .bus = &platform_bus_type,
840         .probe = wf_smu_probe,
841         .remove = wf_smu_remove,
842 };
843
844
845 static int __init wf_smu_init(void)
846 {
847         int rc = -ENODEV;
848
849         if (machine_is_compatible("PowerMac8,1") ||
850             machine_is_compatible("PowerMac8,2"))
851                 rc = wf_init_pm();
852
853         if (rc == 0) {
854 #ifdef MODULE
855                 request_module("windfarm_smu_controls");
856                 request_module("windfarm_smu_sensors");
857                 request_module("windfarm_lm75_sensor");
858
859 #endif /* MODULE */
860                 driver_register(&wf_smu_driver);
861         }
862
863         return rc;
864 }
865
866 static void __exit wf_smu_exit(void)
867 {
868
869         driver_unregister(&wf_smu_driver);
870 }
871
872
873 module_init(wf_smu_init);
874 module_exit(wf_smu_exit);
875
876 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
877 MODULE_DESCRIPTION("Thermal control logic for iMac G5");
878 MODULE_LICENSE("GPL");
879