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-rw-r--r--drivers/macintosh/windfarm_pm91.c814
1 files changed, 814 insertions, 0 deletions
diff --git a/drivers/macintosh/windfarm_pm91.c b/drivers/macintosh/windfarm_pm91.c
new file mode 100644
index 000000000000..43243cf7410b
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+++ b/drivers/macintosh/windfarm_pm91.c
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1/*
2 * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops
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 * PowerMac9,1
17 * ===========
18 *
19 * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't
20 * try to play with other control loops fans). Drive bay is rather basic PID
21 * with one sensor and one fan. Slots area is a bit different as the Darwin
22 * driver is supposed to be capable of working in a special "AGP" mode which
23 * involves the presence of an AGP sensor and an AGP fan (possibly on the
24 * AGP card itself). I can't deal with that special mode as I don't have
25 * access to those additional sensor/fans for now (though ultimately, it would
26 * be possible to add sensor objects for them) so I'm only implementing the
27 * basic PCI slot control loop
28 */
29
30#include <linux/types.h>
31#include <linux/errno.h>
32#include <linux/kernel.h>
33#include <linux/delay.h>
34#include <linux/slab.h>
35#include <linux/init.h>
36#include <linux/spinlock.h>
37#include <linux/wait.h>
38#include <linux/kmod.h>
39#include <linux/device.h>
40#include <linux/platform_device.h>
41#include <asm/prom.h>
42#include <asm/machdep.h>
43#include <asm/io.h>
44#include <asm/system.h>
45#include <asm/sections.h>
46#include <asm/smu.h>
47
48#include "windfarm.h"
49#include "windfarm_pid.h"
50
51#define VERSION "0.4"
52
53#undef DEBUG
54
55#ifdef DEBUG
56#define DBG(args...) printk(args)
57#else
58#define DBG(args...) do { } while(0)
59#endif
60
61/* define this to force CPU overtemp to 74 degree, useful for testing
62 * the overtemp code
63 */
64#undef HACKED_OVERTEMP
65
66static struct device *wf_smu_dev;
67
68/* Controls & sensors */
69static struct wf_sensor *sensor_cpu_power;
70static struct wf_sensor *sensor_cpu_temp;
71static struct wf_sensor *sensor_hd_temp;
72static struct wf_sensor *sensor_slots_power;
73static struct wf_control *fan_cpu_main;
74static struct wf_control *fan_cpu_second;
75static struct wf_control *fan_cpu_third;
76static struct wf_control *fan_hd;
77static struct wf_control *fan_slots;
78static struct wf_control *cpufreq_clamp;
79
80/* Set to kick the control loop into life */
81static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
82
83/* Failure handling.. could be nicer */
84#define FAILURE_FAN 0x01
85#define FAILURE_SENSOR 0x02
86#define FAILURE_OVERTEMP 0x04
87
88static unsigned int wf_smu_failure_state;
89static int wf_smu_readjust, wf_smu_skipping;
90
91/*
92 * ****** CPU Fans Control Loop ******
93 *
94 */
95
96
97#define WF_SMU_CPU_FANS_INTERVAL 1
98#define WF_SMU_CPU_FANS_MAX_HISTORY 16
99
100/* State data used by the cpu fans control loop
101 */
102struct wf_smu_cpu_fans_state {
103 int ticks;
104 s32 cpu_setpoint;
105 struct wf_cpu_pid_state pid;
106};
107
108static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
109
110
111
112/*
113 * ****** Drive Fan Control Loop ******
114 *
115 */
116
117struct wf_smu_drive_fans_state {
118 int ticks;
119 s32 setpoint;
120 struct wf_pid_state pid;
121};
122
123static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
124
125/*
126 * ****** Slots Fan Control Loop ******
127 *
128 */
129
130struct wf_smu_slots_fans_state {
131 int ticks;
132 s32 setpoint;
133 struct wf_pid_state pid;
134};
135
136static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
137
138/*
139 * ***** Implementation *****
140 *
141 */
142
143
144static void wf_smu_create_cpu_fans(void)
145{
146 struct wf_cpu_pid_param pid_param;
147 struct smu_sdbp_header *hdr;
148 struct smu_sdbp_cpupiddata *piddata;
149 struct smu_sdbp_fvt *fvt;
150 s32 tmax, tdelta, maxpow, powadj;
151
152 /* First, locate the PID params in SMU SBD */
153 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
154 if (hdr == 0) {
155 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
156 "max fan speed\n");
157 goto fail;
158 }
159 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
160
161 /* Get the FVT params for operating point 0 (the only supported one
162 * for now) in order to get tmax
163 */
164 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
165 if (hdr) {
166 fvt = (struct smu_sdbp_fvt *)&hdr[1];
167 tmax = ((s32)fvt->maxtemp) << 16;
168 } else
169 tmax = 0x5e0000; /* 94 degree default */
170
171 /* Alloc & initialize state */
172 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
173 GFP_KERNEL);
174 if (wf_smu_cpu_fans == NULL)
175 goto fail;
176 wf_smu_cpu_fans->ticks = 1;
177
178 /* Fill PID params */
179 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
180 pid_param.history_len = piddata->history_len;
181 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
182 printk(KERN_WARNING "windfarm: History size overflow on "
183 "CPU control loop (%d)\n", piddata->history_len);
184 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
185 }
186 pid_param.gd = piddata->gd;
187 pid_param.gp = piddata->gp;
188 pid_param.gr = piddata->gr / pid_param.history_len;
189
190 tdelta = ((s32)piddata->target_temp_delta) << 16;
191 maxpow = ((s32)piddata->max_power) << 16;
192 powadj = ((s32)piddata->power_adj) << 16;
193
194 pid_param.tmax = tmax;
195 pid_param.ttarget = tmax - tdelta;
196 pid_param.pmaxadj = maxpow - powadj;
197
198 pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
199 pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);
200
201 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
202
203 DBG("wf: CPU Fan control initialized.\n");
204 DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
205 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
206 pid_param.min, pid_param.max);
207
208 return;
209
210 fail:
211 printk(KERN_WARNING "windfarm: CPU fan config not found\n"
212 "for this machine model, max fan speed\n");
213
214 if (cpufreq_clamp)
215 wf_control_set_max(cpufreq_clamp);
216 if (fan_cpu_main)
217 wf_control_set_max(fan_cpu_main);
218}
219
220static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
221{
222 s32 new_setpoint, temp, power;
223 int rc;
224
225 if (--st->ticks != 0) {
226 if (wf_smu_readjust)
227 goto readjust;
228 return;
229 }
230 st->ticks = WF_SMU_CPU_FANS_INTERVAL;
231
232 rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
233 if (rc) {
234 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
235 rc);
236 wf_smu_failure_state |= FAILURE_SENSOR;
237 return;
238 }
239
240 rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
241 if (rc) {
242 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
243 rc);
244 wf_smu_failure_state |= FAILURE_SENSOR;
245 return;
246 }
247
248 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
249 FIX32TOPRINT(temp), FIX32TOPRINT(power));
250
251#ifdef HACKED_OVERTEMP
252 if (temp > 0x4a0000)
253 wf_smu_failure_state |= FAILURE_OVERTEMP;
254#else
255 if (temp > st->pid.param.tmax)
256 wf_smu_failure_state |= FAILURE_OVERTEMP;
257#endif
258 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
259
260 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
261
262 if (st->cpu_setpoint == new_setpoint)
263 return;
264 st->cpu_setpoint = new_setpoint;
265 readjust:
266 if (fan_cpu_main && wf_smu_failure_state == 0) {
267 rc = fan_cpu_main->ops->set_value(fan_cpu_main,
268 st->cpu_setpoint);
269 if (rc) {
270 printk(KERN_WARNING "windfarm: CPU main fan"
271 " error %d\n", rc);
272 wf_smu_failure_state |= FAILURE_FAN;
273 }
274 }
275 if (fan_cpu_second && wf_smu_failure_state == 0) {
276 rc = fan_cpu_second->ops->set_value(fan_cpu_second,
277 st->cpu_setpoint);
278 if (rc) {
279 printk(KERN_WARNING "windfarm: CPU second fan"
280 " error %d\n", rc);
281 wf_smu_failure_state |= FAILURE_FAN;
282 }
283 }
284 if (fan_cpu_third && wf_smu_failure_state == 0) {
285 rc = fan_cpu_main->ops->set_value(fan_cpu_third,
286 st->cpu_setpoint);
287 if (rc) {
288 printk(KERN_WARNING "windfarm: CPU third fan"
289 " error %d\n", rc);
290 wf_smu_failure_state |= FAILURE_FAN;
291 }
292 }
293}
294
295static void wf_smu_create_drive_fans(void)
296{
297 struct wf_pid_param param = {
298 .interval = 5,
299 .history_len = 2,
300 .gd = 0x01e00000,
301 .gp = 0x00500000,
302 .gr = 0x00000000,
303 .itarget = 0x00200000,
304 };
305
306 /* Alloc & initialize state */
307 wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
308 GFP_KERNEL);
309 if (wf_smu_drive_fans == NULL) {
310 printk(KERN_WARNING "windfarm: Memory allocation error"
311 " max fan speed\n");
312 goto fail;
313 }
314 wf_smu_drive_fans->ticks = 1;
315
316 /* Fill PID params */
317 param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
318 param.min = fan_hd->ops->get_min(fan_hd);
319 param.max = fan_hd->ops->get_max(fan_hd);
320 wf_pid_init(&wf_smu_drive_fans->pid, &param);
321
322 DBG("wf: Drive Fan control initialized.\n");
323 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
324 FIX32TOPRINT(param.itarget), param.min, param.max);
325 return;
326
327 fail:
328 if (fan_hd)
329 wf_control_set_max(fan_hd);
330}
331
332static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
333{
334 s32 new_setpoint, temp;
335 int rc;
336
337 if (--st->ticks != 0) {
338 if (wf_smu_readjust)
339 goto readjust;
340 return;
341 }
342 st->ticks = st->pid.param.interval;
343
344 rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
345 if (rc) {
346 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
347 rc);
348 wf_smu_failure_state |= FAILURE_SENSOR;
349 return;
350 }
351
352 DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
353 FIX32TOPRINT(temp));
354
355 if (temp > (st->pid.param.itarget + 0x50000))
356 wf_smu_failure_state |= FAILURE_OVERTEMP;
357
358 new_setpoint = wf_pid_run(&st->pid, temp);
359
360 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
361
362 if (st->setpoint == new_setpoint)
363 return;
364 st->setpoint = new_setpoint;
365 readjust:
366 if (fan_hd && wf_smu_failure_state == 0) {
367 rc = fan_hd->ops->set_value(fan_hd, st->setpoint);
368 if (rc) {
369 printk(KERN_WARNING "windfarm: HD fan error %d\n",
370 rc);
371 wf_smu_failure_state |= FAILURE_FAN;
372 }
373 }
374}
375
376static void wf_smu_create_slots_fans(void)
377{
378 struct wf_pid_param param = {
379 .interval = 1,
380 .history_len = 8,
381 .gd = 0x00000000,
382 .gp = 0x00000000,
383 .gr = 0x00020000,
384 .itarget = 0x00000000
385 };
386
387 /* Alloc & initialize state */
388 wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
389 GFP_KERNEL);
390 if (wf_smu_slots_fans == NULL) {
391 printk(KERN_WARNING "windfarm: Memory allocation error"
392 " max fan speed\n");
393 goto fail;
394 }
395 wf_smu_slots_fans->ticks = 1;
396
397 /* Fill PID params */
398 param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
399 param.min = fan_slots->ops->get_min(fan_slots);
400 param.max = fan_slots->ops->get_max(fan_slots);
401 wf_pid_init(&wf_smu_slots_fans->pid, &param);
402
403 DBG("wf: Slots Fan control initialized.\n");
404 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
405 FIX32TOPRINT(param.itarget), param.min, param.max);
406 return;
407
408 fail:
409 if (fan_slots)
410 wf_control_set_max(fan_slots);
411}
412
413static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
414{
415 s32 new_setpoint, power;
416 int rc;
417
418 if (--st->ticks != 0) {
419 if (wf_smu_readjust)
420 goto readjust;
421 return;
422 }
423 st->ticks = st->pid.param.interval;
424
425 rc = sensor_slots_power->ops->get_value(sensor_slots_power, &power);
426 if (rc) {
427 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
428 rc);
429 wf_smu_failure_state |= FAILURE_SENSOR;
430 return;
431 }
432
433 DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
434 FIX32TOPRINT(power));
435
436#if 0 /* Check what makes a good overtemp condition */
437 if (power > (st->pid.param.itarget + 0x50000))
438 wf_smu_failure_state |= FAILURE_OVERTEMP;
439#endif
440
441 new_setpoint = wf_pid_run(&st->pid, power);
442
443 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
444
445 if (st->setpoint == new_setpoint)
446 return;
447 st->setpoint = new_setpoint;
448 readjust:
449 if (fan_slots && wf_smu_failure_state == 0) {
450 rc = fan_slots->ops->set_value(fan_slots, st->setpoint);
451 if (rc) {
452 printk(KERN_WARNING "windfarm: Slots fan error %d\n",
453 rc);
454 wf_smu_failure_state |= FAILURE_FAN;
455 }
456 }
457}
458
459
460/*
461 * ****** Attributes ******
462 *
463 */
464
465#define BUILD_SHOW_FUNC_FIX(name, data) \
466static ssize_t show_##name(struct device *dev, \
467 struct device_attribute *attr, \
468 char *buf) \
469{ \
470 ssize_t r; \
471 s32 val = 0; \
472 data->ops->get_value(data, &val); \
473 r = sprintf(buf, "%d.%03d", FIX32TOPRINT(val)); \
474 return r; \
475} \
476static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL);
477
478
479#define BUILD_SHOW_FUNC_INT(name, data) \
480static ssize_t show_##name(struct device *dev, \
481 struct device_attribute *attr, \
482 char *buf) \
483{ \
484 s32 val = 0; \
485 data->ops->get_value(data, &val); \
486 return sprintf(buf, "%d", val); \
487} \
488static DEVICE_ATTR(name,S_IRUGO,show_##name, NULL);
489
490BUILD_SHOW_FUNC_INT(cpu_fan, fan_cpu_main);
491BUILD_SHOW_FUNC_INT(hd_fan, fan_hd);
492BUILD_SHOW_FUNC_INT(slots_fan, fan_slots);
493
494BUILD_SHOW_FUNC_FIX(cpu_temp, sensor_cpu_temp);
495BUILD_SHOW_FUNC_FIX(cpu_power, sensor_cpu_power);
496BUILD_SHOW_FUNC_FIX(hd_temp, sensor_hd_temp);
497BUILD_SHOW_FUNC_FIX(slots_power, sensor_slots_power);
498
499/*
500 * ****** Setup / Init / Misc ... ******
501 *
502 */
503
504static void wf_smu_tick(void)
505{
506 unsigned int last_failure = wf_smu_failure_state;
507 unsigned int new_failure;
508
509 if (!wf_smu_started) {
510 DBG("wf: creating control loops !\n");
511 wf_smu_create_drive_fans();
512 wf_smu_create_slots_fans();
513 wf_smu_create_cpu_fans();
514 wf_smu_started = 1;
515 }
516
517 /* Skipping ticks */
518 if (wf_smu_skipping && --wf_smu_skipping)
519 return;
520
521 wf_smu_failure_state = 0;
522 if (wf_smu_drive_fans)
523 wf_smu_drive_fans_tick(wf_smu_drive_fans);
524 if (wf_smu_slots_fans)
525 wf_smu_slots_fans_tick(wf_smu_slots_fans);
526 if (wf_smu_cpu_fans)
527 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
528
529 wf_smu_readjust = 0;
530 new_failure = wf_smu_failure_state & ~last_failure;
531
532 /* If entering failure mode, clamp cpufreq and ramp all
533 * fans to full speed.
534 */
535 if (wf_smu_failure_state && !last_failure) {
536 if (cpufreq_clamp)
537 wf_control_set_max(cpufreq_clamp);
538 if (fan_cpu_main)
539 wf_control_set_max(fan_cpu_main);
540 if (fan_cpu_second)
541 wf_control_set_max(fan_cpu_second);
542 if (fan_cpu_third)
543 wf_control_set_max(fan_cpu_third);
544 if (fan_hd)
545 wf_control_set_max(fan_hd);
546 if (fan_slots)
547 wf_control_set_max(fan_slots);
548 }
549
550 /* If leaving failure mode, unclamp cpufreq and readjust
551 * all fans on next iteration
552 */
553 if (!wf_smu_failure_state && last_failure) {
554 if (cpufreq_clamp)
555 wf_control_set_min(cpufreq_clamp);
556 wf_smu_readjust = 1;
557 }
558
559 /* Overtemp condition detected, notify and start skipping a couple
560 * ticks to let the temperature go down
561 */
562 if (new_failure & FAILURE_OVERTEMP) {
563 wf_set_overtemp();
564 wf_smu_skipping = 2;
565 }
566
567 /* We only clear the overtemp condition if overtemp is cleared
568 * _and_ no other failure is present. Since a sensor error will
569 * clear the overtemp condition (can't measure temperature) at
570 * the control loop levels, but we don't want to keep it clear
571 * here in this case
572 */
573 if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
574 wf_clear_overtemp();
575}
576
577
578static void wf_smu_new_control(struct wf_control *ct)
579{
580 if (wf_smu_all_controls_ok)
581 return;
582
583 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
584 if (wf_get_control(ct) == 0) {
585 fan_cpu_main = ct;
586 device_create_file(wf_smu_dev, &dev_attr_cpu_fan);
587 }
588 }
589
590 if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
591 if (wf_get_control(ct) == 0)
592 fan_cpu_second = ct;
593 }
594
595 if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
596 if (wf_get_control(ct) == 0)
597 fan_cpu_third = ct;
598 }
599
600 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
601 if (wf_get_control(ct) == 0)
602 cpufreq_clamp = ct;
603 }
604
605 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
606 if (wf_get_control(ct) == 0) {
607 fan_hd = ct;
608 device_create_file(wf_smu_dev, &dev_attr_hd_fan);
609 }
610 }
611
612 if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
613 if (wf_get_control(ct) == 0) {
614 fan_slots = ct;
615 device_create_file(wf_smu_dev, &dev_attr_slots_fan);
616 }
617 }
618
619 if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
620 fan_slots && cpufreq_clamp)
621 wf_smu_all_controls_ok = 1;
622}
623
624static void wf_smu_new_sensor(struct wf_sensor *sr)
625{
626 if (wf_smu_all_sensors_ok)
627 return;
628
629 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
630 if (wf_get_sensor(sr) == 0) {
631 sensor_cpu_power = sr;
632 device_create_file(wf_smu_dev, &dev_attr_cpu_power);
633 }
634 }
635
636 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
637 if (wf_get_sensor(sr) == 0) {
638 sensor_cpu_temp = sr;
639 device_create_file(wf_smu_dev, &dev_attr_cpu_temp);
640 }
641 }
642
643 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
644 if (wf_get_sensor(sr) == 0) {
645 sensor_hd_temp = sr;
646 device_create_file(wf_smu_dev, &dev_attr_hd_temp);
647 }
648 }
649
650 if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
651 if (wf_get_sensor(sr) == 0) {
652 sensor_slots_power = sr;
653 device_create_file(wf_smu_dev, &dev_attr_slots_power);
654 }
655 }
656
657 if (sensor_cpu_power && sensor_cpu_temp &&
658 sensor_hd_temp && sensor_slots_power)
659 wf_smu_all_sensors_ok = 1;
660}
661
662
663static int wf_smu_notify(struct notifier_block *self,
664 unsigned long event, void *data)
665{
666 switch(event) {
667 case WF_EVENT_NEW_CONTROL:
668 DBG("wf: new control %s detected\n",
669 ((struct wf_control *)data)->name);
670 wf_smu_new_control(data);
671 wf_smu_readjust = 1;
672 break;
673 case WF_EVENT_NEW_SENSOR:
674 DBG("wf: new sensor %s detected\n",
675 ((struct wf_sensor *)data)->name);
676 wf_smu_new_sensor(data);
677 break;
678 case WF_EVENT_TICK:
679 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
680 wf_smu_tick();
681 }
682
683 return 0;
684}
685
686static struct notifier_block wf_smu_events = {
687 .notifier_call = wf_smu_notify,
688};
689
690static int wf_init_pm(void)
691{
692 printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
693
694 return 0;
695}
696
697static int wf_smu_probe(struct device *ddev)
698{
699 wf_smu_dev = ddev;
700
701 wf_register_client(&wf_smu_events);
702
703 return 0;
704}
705
706static int wf_smu_remove(struct device *ddev)
707{
708 wf_unregister_client(&wf_smu_events);
709
710 /* XXX We don't have yet a guarantee that our callback isn't
711 * in progress when returning from wf_unregister_client, so
712 * we add an arbitrary delay. I'll have to fix that in the core
713 */
714 msleep(1000);
715
716 /* Release all sensors */
717 /* One more crappy race: I don't think we have any guarantee here
718 * that the attribute callback won't race with the sensor beeing
719 * disposed of, and I'm not 100% certain what best way to deal
720 * with that except by adding locks all over... I'll do that
721 * eventually but heh, who ever rmmod this module anyway ?
722 */
723 if (sensor_cpu_power) {
724 device_remove_file(wf_smu_dev, &dev_attr_cpu_power);
725 wf_put_sensor(sensor_cpu_power);
726 }
727 if (sensor_cpu_temp) {
728 device_remove_file(wf_smu_dev, &dev_attr_cpu_temp);
729 wf_put_sensor(sensor_cpu_temp);
730 }
731 if (sensor_hd_temp) {
732 device_remove_file(wf_smu_dev, &dev_attr_hd_temp);
733 wf_put_sensor(sensor_hd_temp);
734 }
735 if (sensor_slots_power) {
736 device_remove_file(wf_smu_dev, &dev_attr_slots_power);
737 wf_put_sensor(sensor_slots_power);
738 }
739
740 /* Release all controls */
741 if (fan_cpu_main) {
742 device_remove_file(wf_smu_dev, &dev_attr_cpu_fan);
743 wf_put_control(fan_cpu_main);
744 }
745 if (fan_cpu_second)
746 wf_put_control(fan_cpu_second);
747 if (fan_cpu_third)
748 wf_put_control(fan_cpu_third);
749 if (fan_hd) {
750 device_remove_file(wf_smu_dev, &dev_attr_hd_fan);
751 wf_put_control(fan_hd);
752 }
753 if (fan_slots) {
754 device_remove_file(wf_smu_dev, &dev_attr_slots_fan);
755 wf_put_control(fan_slots);
756 }
757 if (cpufreq_clamp)
758 wf_put_control(cpufreq_clamp);
759
760 /* Destroy control loops state structures */
761 if (wf_smu_slots_fans)
762 kfree(wf_smu_cpu_fans);
763 if (wf_smu_drive_fans)
764 kfree(wf_smu_cpu_fans);
765 if (wf_smu_cpu_fans)
766 kfree(wf_smu_cpu_fans);
767
768 wf_smu_dev = NULL;
769
770 return 0;
771}
772
773static struct device_driver wf_smu_driver = {
774 .name = "windfarm",
775 .bus = &platform_bus_type,
776 .probe = wf_smu_probe,
777 .remove = wf_smu_remove,
778};
779
780
781static int __init wf_smu_init(void)
782{
783 int rc = -ENODEV;
784
785 if (machine_is_compatible("PowerMac9,1"))
786 rc = wf_init_pm();
787
788 if (rc == 0) {
789#ifdef MODULE
790 request_module("windfarm_smu_controls");
791 request_module("windfarm_smu_sensors");
792 request_module("windfarm_lm75_sensor");
793
794#endif /* MODULE */
795 driver_register(&wf_smu_driver);
796 }
797
798 return rc;
799}
800
801static void __exit wf_smu_exit(void)
802{
803
804 driver_unregister(&wf_smu_driver);
805}
806
807
808module_init(wf_smu_init);
809module_exit(wf_smu_exit);
810
811MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
812MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
813MODULE_LICENSE("GPL");
814
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 02:40:29 -0500