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75722d39 BH |
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 | ||
66 | static struct device *wf_smu_dev; | |
67 | ||
68 | /* Controls & sensors */ | |
69 | static struct wf_sensor *sensor_cpu_power; | |
70 | static struct wf_sensor *sensor_cpu_temp; | |
71 | static struct wf_sensor *sensor_hd_temp; | |
72 | static struct wf_sensor *sensor_slots_power; | |
73 | static struct wf_control *fan_cpu_main; | |
74 | static struct wf_control *fan_cpu_second; | |
75 | static struct wf_control *fan_cpu_third; | |
76 | static struct wf_control *fan_hd; | |
77 | static struct wf_control *fan_slots; | |
78 | static struct wf_control *cpufreq_clamp; | |
79 | ||
80 | /* Set to kick the control loop into life */ | |
81 | static 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 | ||
88 | static unsigned int wf_smu_failure_state; | |
89 | static 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 | */ | |
102 | struct wf_smu_cpu_fans_state { | |
103 | int ticks; | |
104 | s32 cpu_setpoint; | |
105 | struct wf_cpu_pid_state pid; | |
106 | }; | |
107 | ||
108 | static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; | |
109 | ||
110 | ||
111 | ||
112 | /* | |
113 | * ****** Drive Fan Control Loop ****** | |
114 | * | |
115 | */ | |
116 | ||
117 | struct wf_smu_drive_fans_state { | |
118 | int ticks; | |
119 | s32 setpoint; | |
120 | struct wf_pid_state pid; | |
121 | }; | |
122 | ||
123 | static struct wf_smu_drive_fans_state *wf_smu_drive_fans; | |
124 | ||
125 | /* | |
126 | * ****** Slots Fan Control Loop ****** | |
127 | * | |
128 | */ | |
129 | ||
130 | struct wf_smu_slots_fans_state { | |
131 | int ticks; | |
132 | s32 setpoint; | |
133 | struct wf_pid_state pid; | |
134 | }; | |
135 | ||
136 | static struct wf_smu_slots_fans_state *wf_smu_slots_fans; | |
137 | ||
138 | /* | |
139 | * ***** Implementation ***** | |
140 | * | |
141 | */ | |
142 | ||
143 | ||
144 | static 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 | ||
220 | static 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 | ||
295 | static 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, ¶m); | |
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 | ||
332 | static 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 | ||
376 | static 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, ¶m); | |
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 | ||
413 | static 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 | ||
75722d39 BH |
460 | /* |
461 | * ****** Setup / Init / Misc ... ****** | |
462 | * | |
463 | */ | |
464 | ||
465 | static void wf_smu_tick(void) | |
466 | { | |
467 | unsigned int last_failure = wf_smu_failure_state; | |
468 | unsigned int new_failure; | |
469 | ||
470 | if (!wf_smu_started) { | |
471 | DBG("wf: creating control loops !\n"); | |
472 | wf_smu_create_drive_fans(); | |
473 | wf_smu_create_slots_fans(); | |
474 | wf_smu_create_cpu_fans(); | |
475 | wf_smu_started = 1; | |
476 | } | |
477 | ||
478 | /* Skipping ticks */ | |
479 | if (wf_smu_skipping && --wf_smu_skipping) | |
480 | return; | |
481 | ||
482 | wf_smu_failure_state = 0; | |
483 | if (wf_smu_drive_fans) | |
484 | wf_smu_drive_fans_tick(wf_smu_drive_fans); | |
485 | if (wf_smu_slots_fans) | |
486 | wf_smu_slots_fans_tick(wf_smu_slots_fans); | |
487 | if (wf_smu_cpu_fans) | |
488 | wf_smu_cpu_fans_tick(wf_smu_cpu_fans); | |
489 | ||
490 | wf_smu_readjust = 0; | |
491 | new_failure = wf_smu_failure_state & ~last_failure; | |
492 | ||
493 | /* If entering failure mode, clamp cpufreq and ramp all | |
494 | * fans to full speed. | |
495 | */ | |
496 | if (wf_smu_failure_state && !last_failure) { | |
497 | if (cpufreq_clamp) | |
498 | wf_control_set_max(cpufreq_clamp); | |
499 | if (fan_cpu_main) | |
500 | wf_control_set_max(fan_cpu_main); | |
501 | if (fan_cpu_second) | |
502 | wf_control_set_max(fan_cpu_second); | |
503 | if (fan_cpu_third) | |
504 | wf_control_set_max(fan_cpu_third); | |
505 | if (fan_hd) | |
506 | wf_control_set_max(fan_hd); | |
507 | if (fan_slots) | |
508 | wf_control_set_max(fan_slots); | |
509 | } | |
510 | ||
511 | /* If leaving failure mode, unclamp cpufreq and readjust | |
512 | * all fans on next iteration | |
513 | */ | |
514 | if (!wf_smu_failure_state && last_failure) { | |
515 | if (cpufreq_clamp) | |
516 | wf_control_set_min(cpufreq_clamp); | |
517 | wf_smu_readjust = 1; | |
518 | } | |
519 | ||
520 | /* Overtemp condition detected, notify and start skipping a couple | |
521 | * ticks to let the temperature go down | |
522 | */ | |
523 | if (new_failure & FAILURE_OVERTEMP) { | |
524 | wf_set_overtemp(); | |
525 | wf_smu_skipping = 2; | |
526 | } | |
527 | ||
528 | /* We only clear the overtemp condition if overtemp is cleared | |
529 | * _and_ no other failure is present. Since a sensor error will | |
530 | * clear the overtemp condition (can't measure temperature) at | |
531 | * the control loop levels, but we don't want to keep it clear | |
532 | * here in this case | |
533 | */ | |
534 | if (new_failure == 0 && last_failure & FAILURE_OVERTEMP) | |
535 | wf_clear_overtemp(); | |
536 | } | |
537 | ||
538 | ||
539 | static void wf_smu_new_control(struct wf_control *ct) | |
540 | { | |
541 | if (wf_smu_all_controls_ok) | |
542 | return; | |
543 | ||
544 | if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) { | |
ac171c46 | 545 | if (wf_get_control(ct) == 0) |
75722d39 | 546 | fan_cpu_main = ct; |
75722d39 BH |
547 | } |
548 | ||
549 | if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) { | |
550 | if (wf_get_control(ct) == 0) | |
551 | fan_cpu_second = ct; | |
552 | } | |
553 | ||
554 | if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) { | |
555 | if (wf_get_control(ct) == 0) | |
556 | fan_cpu_third = ct; | |
557 | } | |
558 | ||
559 | if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { | |
560 | if (wf_get_control(ct) == 0) | |
561 | cpufreq_clamp = ct; | |
562 | } | |
563 | ||
564 | if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { | |
ac171c46 | 565 | if (wf_get_control(ct) == 0) |
75722d39 | 566 | fan_hd = ct; |
75722d39 BH |
567 | } |
568 | ||
569 | if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) { | |
ac171c46 | 570 | if (wf_get_control(ct) == 0) |
75722d39 | 571 | fan_slots = ct; |
75722d39 BH |
572 | } |
573 | ||
574 | if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd && | |
575 | fan_slots && cpufreq_clamp) | |
576 | wf_smu_all_controls_ok = 1; | |
577 | } | |
578 | ||
579 | static void wf_smu_new_sensor(struct wf_sensor *sr) | |
580 | { | |
581 | if (wf_smu_all_sensors_ok) | |
582 | return; | |
583 | ||
584 | if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { | |
ac171c46 | 585 | if (wf_get_sensor(sr) == 0) |
75722d39 | 586 | sensor_cpu_power = sr; |
75722d39 BH |
587 | } |
588 | ||
589 | if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { | |
ac171c46 | 590 | if (wf_get_sensor(sr) == 0) |
75722d39 | 591 | sensor_cpu_temp = sr; |
75722d39 BH |
592 | } |
593 | ||
594 | if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { | |
ac171c46 | 595 | if (wf_get_sensor(sr) == 0) |
75722d39 | 596 | sensor_hd_temp = sr; |
75722d39 BH |
597 | } |
598 | ||
599 | if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) { | |
ac171c46 | 600 | if (wf_get_sensor(sr) == 0) |
75722d39 | 601 | sensor_slots_power = sr; |
75722d39 BH |
602 | } |
603 | ||
604 | if (sensor_cpu_power && sensor_cpu_temp && | |
605 | sensor_hd_temp && sensor_slots_power) | |
606 | wf_smu_all_sensors_ok = 1; | |
607 | } | |
608 | ||
609 | ||
610 | static int wf_smu_notify(struct notifier_block *self, | |
611 | unsigned long event, void *data) | |
612 | { | |
613 | switch(event) { | |
614 | case WF_EVENT_NEW_CONTROL: | |
615 | DBG("wf: new control %s detected\n", | |
616 | ((struct wf_control *)data)->name); | |
617 | wf_smu_new_control(data); | |
618 | wf_smu_readjust = 1; | |
619 | break; | |
620 | case WF_EVENT_NEW_SENSOR: | |
621 | DBG("wf: new sensor %s detected\n", | |
622 | ((struct wf_sensor *)data)->name); | |
623 | wf_smu_new_sensor(data); | |
624 | break; | |
625 | case WF_EVENT_TICK: | |
626 | if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) | |
627 | wf_smu_tick(); | |
628 | } | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | static struct notifier_block wf_smu_events = { | |
634 | .notifier_call = wf_smu_notify, | |
635 | }; | |
636 | ||
637 | static int wf_init_pm(void) | |
638 | { | |
639 | printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | static int wf_smu_probe(struct device *ddev) | |
645 | { | |
646 | wf_smu_dev = ddev; | |
647 | ||
648 | wf_register_client(&wf_smu_events); | |
649 | ||
650 | return 0; | |
651 | } | |
652 | ||
653 | static int wf_smu_remove(struct device *ddev) | |
654 | { | |
655 | wf_unregister_client(&wf_smu_events); | |
656 | ||
657 | /* XXX We don't have yet a guarantee that our callback isn't | |
658 | * in progress when returning from wf_unregister_client, so | |
659 | * we add an arbitrary delay. I'll have to fix that in the core | |
660 | */ | |
661 | msleep(1000); | |
662 | ||
663 | /* Release all sensors */ | |
664 | /* One more crappy race: I don't think we have any guarantee here | |
665 | * that the attribute callback won't race with the sensor beeing | |
666 | * disposed of, and I'm not 100% certain what best way to deal | |
667 | * with that except by adding locks all over... I'll do that | |
668 | * eventually but heh, who ever rmmod this module anyway ? | |
669 | */ | |
ac171c46 | 670 | if (sensor_cpu_power) |
75722d39 | 671 | wf_put_sensor(sensor_cpu_power); |
ac171c46 | 672 | if (sensor_cpu_temp) |
75722d39 | 673 | wf_put_sensor(sensor_cpu_temp); |
ac171c46 | 674 | if (sensor_hd_temp) |
75722d39 | 675 | wf_put_sensor(sensor_hd_temp); |
ac171c46 | 676 | if (sensor_slots_power) |
75722d39 | 677 | wf_put_sensor(sensor_slots_power); |
75722d39 BH |
678 | |
679 | /* Release all controls */ | |
ac171c46 | 680 | if (fan_cpu_main) |
75722d39 | 681 | wf_put_control(fan_cpu_main); |
75722d39 BH |
682 | if (fan_cpu_second) |
683 | wf_put_control(fan_cpu_second); | |
684 | if (fan_cpu_third) | |
685 | wf_put_control(fan_cpu_third); | |
ac171c46 | 686 | if (fan_hd) |
75722d39 | 687 | wf_put_control(fan_hd); |
ac171c46 | 688 | if (fan_slots) |
75722d39 | 689 | wf_put_control(fan_slots); |
75722d39 BH |
690 | if (cpufreq_clamp) |
691 | wf_put_control(cpufreq_clamp); | |
692 | ||
693 | /* Destroy control loops state structures */ | |
694 | if (wf_smu_slots_fans) | |
695 | kfree(wf_smu_cpu_fans); | |
696 | if (wf_smu_drive_fans) | |
697 | kfree(wf_smu_cpu_fans); | |
698 | if (wf_smu_cpu_fans) | |
699 | kfree(wf_smu_cpu_fans); | |
700 | ||
701 | wf_smu_dev = NULL; | |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
706 | static struct device_driver wf_smu_driver = { | |
707 | .name = "windfarm", | |
708 | .bus = &platform_bus_type, | |
709 | .probe = wf_smu_probe, | |
710 | .remove = wf_smu_remove, | |
711 | }; | |
712 | ||
713 | ||
714 | static int __init wf_smu_init(void) | |
715 | { | |
716 | int rc = -ENODEV; | |
717 | ||
718 | if (machine_is_compatible("PowerMac9,1")) | |
719 | rc = wf_init_pm(); | |
720 | ||
721 | if (rc == 0) { | |
722 | #ifdef MODULE | |
723 | request_module("windfarm_smu_controls"); | |
724 | request_module("windfarm_smu_sensors"); | |
725 | request_module("windfarm_lm75_sensor"); | |
726 | ||
727 | #endif /* MODULE */ | |
728 | driver_register(&wf_smu_driver); | |
729 | } | |
730 | ||
731 | return rc; | |
732 | } | |
733 | ||
734 | static void __exit wf_smu_exit(void) | |
735 | { | |
736 | ||
737 | driver_unregister(&wf_smu_driver); | |
738 | } | |
739 | ||
740 | ||
741 | module_init(wf_smu_init); | |
742 | module_exit(wf_smu_exit); | |
743 | ||
744 | MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); | |
745 | MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); | |
746 | MODULE_LICENSE("GPL"); | |
747 |