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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
131static int wf_smu_mach_model; /* machine model id */
132
133/* Controls & sensors */
134static struct wf_sensor *sensor_cpu_power;
135static struct wf_sensor *sensor_cpu_temp;
136static struct wf_sensor *sensor_hd_temp;
137static struct wf_control *fan_cpu_main;
138static struct wf_control *fan_hd;
139static struct wf_control *fan_system;
140static struct wf_control *cpufreq_clamp;
141
142/* Set to kick the control loop into life */
143static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok;
144static bool 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
151static unsigned int wf_smu_failure_state;
152static int wf_smu_readjust, wf_smu_skipping;
153static bool wf_smu_overtemp;
154
155/*
156 * ****** System Fans Control Loop ******
157 *
158 */
159
160/* Parameters for the System Fans control loop. Parameters
161 * not in this table such as interval, history size, ...
162 * are common to all versions and thus hard coded for now.
163 */
164struct wf_smu_sys_fans_param {
165 int model_id;
166 s32 itarget;
167 s32 gd, gp, gr;
168
169 s16 offset0;
170 u16 scale0;
171 s16 offset1;
172 u16 scale1;
173};
174
175#define WF_SMU_SYS_FANS_INTERVAL 5
176#define WF_SMU_SYS_FANS_HISTORY_SIZE 2
177
178/* State data used by the system fans control loop
179 */
180struct wf_smu_sys_fans_state {
181 int ticks;
182 s32 sys_setpoint;
183 s32 hd_setpoint;
184 s16 offset0;
185 u16 scale0;
186 s16 offset1;
187 u16 scale1;
188 struct wf_pid_state pid;
189};
190
191/*
192 * Configs for SMU System Fan control loop
193 */
194static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
195 /* Model ID 2 */
196 {
197 .model_id = 2,
198 .itarget = 0x3a0000,
199 .gd = 0x15400000,
200 .gp = 0x00200000,
201 .gr = 0x000002fd,
202 .offset0 = 0xff38,
203 .scale0 = 0x0ccd,
204 .offset1 = 0x0208,
205 .scale1 = 0x07ae,
206 },
207 /* Model ID 3 */
208 {
209 .model_id = 3,
210 .itarget = 0x350000,
211 .gd = 0x08e00000,
212 .gp = 0x00566666,
213 .gr = 0x0000072b,
214 .offset0 = 0xff38,
215 .scale0 = 0x0ccd,
216 .offset1 = 0x0000,
217 .scale1 = 0x0000,
218 },
219 /* Model ID 5 */
220 {
221 .model_id = 5,
222 .itarget = 0x3a0000,
223 .gd = 0x15400000,
224 .gp = 0x00233333,
225 .gr = 0x000002fd,
226 .offset0 = 0x0000,
227 .scale0 = 0x1000,
228 .offset1 = 0x0091,
229 .scale1 = 0x0bae,
230 },
231};
232#define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
233
234static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
235
236/*
237 * ****** CPU Fans Control Loop ******
238 *
239 */
240
241
242#define WF_SMU_CPU_FANS_INTERVAL 1
243#define WF_SMU_CPU_FANS_MAX_HISTORY 16
244#define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000
245#define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50
246
247/* State data used by the cpu fans control loop
248 */
249struct wf_smu_cpu_fans_state {
250 int ticks;
251 s32 cpu_setpoint;
252 s32 scale;
253 s32 offset;
254 struct wf_cpu_pid_state pid;
255};
256
257static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
258
259
260
261/*
262 * ***** Implementation *****
263 *
264 */
265
266static void wf_smu_create_sys_fans(void)
267{
268 struct wf_smu_sys_fans_param *param = NULL;
269 struct wf_pid_param pid_param;
270 int i;
271
272 /* First, locate the params for this model */
273 for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
274 if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
275 param = &wf_smu_sys_all_params[i];
276 break;
277 }
278
279 /* No params found, put fans to max */
280 if (param == NULL) {
281 printk(KERN_WARNING "windfarm: System fan config not found "
282 "for this machine model, max fan speed\n");
283 goto fail;
284 }
285
286 /* Alloc & initialize state */
287 wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
288 GFP_KERNEL);
289 if (wf_smu_sys_fans == NULL) {
290 printk(KERN_WARNING "windfarm: Memory allocation error"
291 " max fan speed\n");
292 goto fail;
293 }
294 wf_smu_sys_fans->ticks = 1;
295 wf_smu_sys_fans->scale0 = param->scale0;
296 wf_smu_sys_fans->offset0 = param->offset0;
297 wf_smu_sys_fans->scale1 = param->scale1;
298 wf_smu_sys_fans->offset1 = param->offset1;
299
300 /* Fill PID params */
301 pid_param.gd = param->gd;
302 pid_param.gp = param->gp;
303 pid_param.gr = param->gr;
304 pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
305 pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
306 pid_param.itarget = param->itarget;
307 pid_param.min = wf_control_get_min(fan_system);
308 pid_param.max = wf_control_get_max(fan_system);
309 if (fan_hd) {
310 pid_param.min =
311 max(pid_param.min, wf_control_get_min(fan_hd));
312 pid_param.max =
313 min(pid_param.max, wf_control_get_max(fan_hd));
314 }
315 wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
316
317 DBG("wf: System Fan control initialized.\n");
318 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
319 FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
320 return;
321
322 fail:
323
324 if (fan_system)
325 wf_control_set_max(fan_system);
326 if (fan_hd)
327 wf_control_set_max(fan_hd);
328}
329
330static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
331{
332 s32 new_setpoint, temp, scaled, cputarget;
333 int rc;
334
335 if (--st->ticks != 0) {
336 if (wf_smu_readjust)
337 goto readjust;
338 return;
339 }
340 st->ticks = WF_SMU_SYS_FANS_INTERVAL;
341
342 rc = wf_sensor_get(sensor_hd_temp, &temp);
343 if (rc) {
344 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
345 rc);
346 wf_smu_failure_state |= FAILURE_SENSOR;
347 return;
348 }
349
350 DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n",
351 FIX32TOPRINT(temp));
352
353 if (temp > (st->pid.param.itarget + 0x50000))
354 wf_smu_failure_state |= FAILURE_OVERTEMP;
355
356 new_setpoint = wf_pid_run(&st->pid, temp);
357
358 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
359
360 scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
361
362 DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
363
364 cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
365 cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
366 scaled = max(scaled, cputarget);
367 scaled = max(scaled, st->pid.param.min);
368 scaled = min(scaled, st->pid.param.max);
369
370 DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
371
372 if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
373 return;
374 st->sys_setpoint = scaled;
375 st->hd_setpoint = new_setpoint;
376 readjust:
377 if (fan_system && wf_smu_failure_state == 0) {
378 rc = wf_control_set(fan_system, st->sys_setpoint);
379 if (rc) {
380 printk(KERN_WARNING "windfarm: Sys fan error %d\n",
381 rc);
382 wf_smu_failure_state |= FAILURE_FAN;
383 }
384 }
385 if (fan_hd && wf_smu_failure_state == 0) {
386 rc = wf_control_set(fan_hd, st->hd_setpoint);
387 if (rc) {
388 printk(KERN_WARNING "windfarm: HD fan error %d\n",
389 rc);
390 wf_smu_failure_state |= FAILURE_FAN;
391 }
392 }
393}
394
395static void wf_smu_create_cpu_fans(void)
396{
397 struct wf_cpu_pid_param pid_param;
398 const struct smu_sdbp_header *hdr;
399 struct smu_sdbp_cpupiddata *piddata;
400 struct smu_sdbp_fvt *fvt;
401 s32 tmax, tdelta, maxpow, powadj;
402
403 /* First, locate the PID params in SMU SBD */
404 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
405 if (hdr == 0) {
406 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
407 "max fan speed\n");
408 goto fail;
409 }
410 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
411
412 /* Get the FVT params for operating point 0 (the only supported one
413 * for now) in order to get tmax
414 */
415 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
416 if (hdr) {
417 fvt = (struct smu_sdbp_fvt *)&hdr[1];
418 tmax = ((s32)fvt->maxtemp) << 16;
419 } else
420 tmax = 0x5e0000; /* 94 degree default */
421
422 /* Alloc & initialize state */
423 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
424 GFP_KERNEL);
425 if (wf_smu_cpu_fans == NULL)
426 goto fail;
427 wf_smu_cpu_fans->ticks = 1;
428
429 wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
430 wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
431
432 /* Fill PID params */
433 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
434 pid_param.history_len = piddata->history_len;
435 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
436 printk(KERN_WARNING "windfarm: History size overflow on "
437 "CPU control loop (%d)\n", piddata->history_len);
438 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
439 }
440 pid_param.gd = piddata->gd;
441 pid_param.gp = piddata->gp;
442 pid_param.gr = piddata->gr / pid_param.history_len;
443
444 tdelta = ((s32)piddata->target_temp_delta) << 16;
445 maxpow = ((s32)piddata->max_power) << 16;
446 powadj = ((s32)piddata->power_adj) << 16;
447
448 pid_param.tmax = tmax;
449 pid_param.ttarget = tmax - tdelta;
450 pid_param.pmaxadj = maxpow - powadj;
451
452 pid_param.min = wf_control_get_min(fan_cpu_main);
453 pid_param.max = wf_control_get_max(fan_cpu_main);
454
455 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
456
457 DBG("wf: CPU Fan control initialized.\n");
458 DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
459 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
460 pid_param.min, pid_param.max);
461
462 return;
463
464 fail:
465 printk(KERN_WARNING "windfarm: CPU fan config not found\n"
466 "for this machine model, max fan speed\n");
467
468 if (cpufreq_clamp)
469 wf_control_set_max(cpufreq_clamp);
470 if (fan_cpu_main)
471 wf_control_set_max(fan_cpu_main);
472}
473
474static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
475{
476 s32 new_setpoint, temp, power, systarget;
477 int rc;
478
479 if (--st->ticks != 0) {
480 if (wf_smu_readjust)
481 goto readjust;
482 return;
483 }
484 st->ticks = WF_SMU_CPU_FANS_INTERVAL;
485
486 rc = wf_sensor_get(sensor_cpu_temp, &temp);
487 if (rc) {
488 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
489 rc);
490 wf_smu_failure_state |= FAILURE_SENSOR;
491 return;
492 }
493
494 rc = wf_sensor_get(sensor_cpu_power, &power);
495 if (rc) {
496 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
497 rc);
498 wf_smu_failure_state |= FAILURE_SENSOR;
499 return;
500 }
501
502 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
503 FIX32TOPRINT(temp), FIX32TOPRINT(power));
504
505#ifdef HACKED_OVERTEMP
506 if (temp > 0x4a0000)
507 wf_smu_failure_state |= FAILURE_OVERTEMP;
508#else
509 if (temp > st->pid.param.tmax)
510 wf_smu_failure_state |= FAILURE_OVERTEMP;
511#endif
512 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
513
514 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
515
516 systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
517 systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
518 + st->offset;
519 new_setpoint = max(new_setpoint, systarget);
520 new_setpoint = max(new_setpoint, st->pid.param.min);
521 new_setpoint = min(new_setpoint, st->pid.param.max);
522
523 DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
524
525 if (st->cpu_setpoint == new_setpoint)
526 return;
527 st->cpu_setpoint = new_setpoint;
528 readjust:
529 if (fan_cpu_main && wf_smu_failure_state == 0) {
530 rc = wf_control_set(fan_cpu_main, 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
544static 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 = true;
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 wf_smu_overtemp = true;
599 }
600
601 /* We only clear the overtemp condition if overtemp is cleared
602 * _and_ no other failure is present. Since a sensor error will
603 * clear the overtemp condition (can't measure temperature) at
604 * the control loop levels, but we don't want to keep it clear
605 * here in this case
606 */
607 if (!wf_smu_failure_state && wf_smu_overtemp) {
608 wf_clear_overtemp();
609 wf_smu_overtemp = false;
610 }
611}
612
613static void wf_smu_new_control(struct wf_control *ct)
614{
615 if (wf_smu_all_controls_ok)
616 return;
617
618 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
619 if (wf_get_control(ct) == 0)
620 fan_cpu_main = ct;
621 }
622
623 if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
624 if (wf_get_control(ct) == 0)
625 fan_system = ct;
626 }
627
628 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
629 if (wf_get_control(ct) == 0)
630 cpufreq_clamp = ct;
631 }
632
633 /* Darwin property list says the HD fan is only for model ID
634 * 0, 1, 2 and 3
635 */
636
637 if (wf_smu_mach_model > 3) {
638 if (fan_system && fan_cpu_main && cpufreq_clamp)
639 wf_smu_all_controls_ok = 1;
640 return;
641 }
642
643 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
644 if (wf_get_control(ct) == 0)
645 fan_hd = ct;
646 }
647
648 if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
649 wf_smu_all_controls_ok = 1;
650}
651
652static void wf_smu_new_sensor(struct wf_sensor *sr)
653{
654 if (wf_smu_all_sensors_ok)
655 return;
656
657 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
658 if (wf_get_sensor(sr) == 0)
659 sensor_cpu_power = sr;
660 }
661
662 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
663 if (wf_get_sensor(sr) == 0)
664 sensor_cpu_temp = sr;
665 }
666
667 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
668 if (wf_get_sensor(sr) == 0)
669 sensor_hd_temp = sr;
670 }
671
672 if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
673 wf_smu_all_sensors_ok = 1;
674}
675
676
677static int wf_smu_notify(struct notifier_block *self,
678 unsigned long event, void *data)
679{
680 switch(event) {
681 case WF_EVENT_NEW_CONTROL:
682 DBG("wf: new control %s detected\n",
683 ((struct wf_control *)data)->name);
684 wf_smu_new_control(data);
685 wf_smu_readjust = 1;
686 break;
687 case WF_EVENT_NEW_SENSOR:
688 DBG("wf: new sensor %s detected\n",
689 ((struct wf_sensor *)data)->name);
690 wf_smu_new_sensor(data);
691 break;
692 case WF_EVENT_TICK:
693 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
694 wf_smu_tick();
695 }
696
697 return 0;
698}
699
700static struct notifier_block wf_smu_events = {
701 .notifier_call = wf_smu_notify,
702};
703
704static int wf_init_pm(void)
705{
706 const struct smu_sdbp_header *hdr;
707
708 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
709 if (hdr != 0) {
710 struct smu_sdbp_sensortree *st =
711 (struct smu_sdbp_sensortree *)&hdr[1];
712 wf_smu_mach_model = st->model_id;
713 }
714
715 printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
716 wf_smu_mach_model);
717
718 return 0;
719}
720
721static int wf_smu_probe(struct platform_device *ddev)
722{
723 wf_register_client(&wf_smu_events);
724
725 return 0;
726}
727
728static int wf_smu_remove(struct platform_device *ddev)
729{
730 wf_unregister_client(&wf_smu_events);
731
732 /* XXX We don't have yet a guarantee that our callback isn't
733 * in progress when returning from wf_unregister_client, so
734 * we add an arbitrary delay. I'll have to fix that in the core
735 */
736 msleep(1000);
737
738 /* Release all sensors */
739 /* One more crappy race: I don't think we have any guarantee here
740 * that the attribute callback won't race with the sensor beeing
741 * disposed of, and I'm not 100% certain what best way to deal
742 * with that except by adding locks all over... I'll do that
743 * eventually but heh, who ever rmmod this module anyway ?
744 */
745 if (sensor_cpu_power)
746 wf_put_sensor(sensor_cpu_power);
747 if (sensor_cpu_temp)
748 wf_put_sensor(sensor_cpu_temp);
749 if (sensor_hd_temp)
750 wf_put_sensor(sensor_hd_temp);
751
752 /* Release all controls */
753 if (fan_cpu_main)
754 wf_put_control(fan_cpu_main);
755 if (fan_hd)
756 wf_put_control(fan_hd);
757 if (fan_system)
758 wf_put_control(fan_system);
759 if (cpufreq_clamp)
760 wf_put_control(cpufreq_clamp);
761
762 /* Destroy control loops state structures */
763 kfree(wf_smu_sys_fans);
764 kfree(wf_smu_cpu_fans);
765
766 return 0;
767}
768
769static struct platform_driver wf_smu_driver = {
770 .probe = wf_smu_probe,
771 .remove = wf_smu_remove,
772 .driver = {
773 .name = "windfarm",
774 },
775};
776
777
778static 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
800static void __exit wf_smu_exit(void)
801{
802
803 platform_driver_unregister(&wf_smu_driver);
804}
805
806
807module_init(wf_smu_init);
808module_exit(wf_smu_exit);
809
810MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
811MODULE_DESCRIPTION("Thermal control logic for iMac G5");
812MODULE_LICENSE("GPL");
813MODULE_ALIAS("platform:windfarm");
814

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