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/* Controls & sensors */ 67static struct wf_sensor *sensor_cpu_power; 68static struct wf_sensor *sensor_cpu_temp; 69static struct wf_sensor *sensor_hd_temp; 70static struct wf_sensor *sensor_slots_power; 71static struct wf_control *fan_cpu_main; 72static struct wf_control *fan_cpu_second; 73static struct wf_control *fan_cpu_third; 74static struct wf_control *fan_hd; 75static struct wf_control *fan_slots; 76static struct wf_control *cpufreq_clamp; 77 78/* Set to kick the control loop into life */ 79static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started; 80 81/* Failure handling.. could be nicer */ 82#define FAILURE_FAN 0x01 83#define FAILURE_SENSOR 0x02 84#define FAILURE_OVERTEMP 0x04 85 86static unsigned int wf_smu_failure_state; 87static int wf_smu_readjust, wf_smu_skipping; 88 89/* 90 * ****** CPU Fans Control Loop ****** 91 * 92 */ 93 94 95#define WF_SMU_CPU_FANS_INTERVAL 1 96#define WF_SMU_CPU_FANS_MAX_HISTORY 16 97 98/* State data used by the cpu fans control loop 99 */ 100struct wf_smu_cpu_fans_state { 101 int ticks; 102 s32 cpu_setpoint; 103 struct wf_cpu_pid_state pid; 104}; 105 106static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; 107 108 109 110/* 111 * ****** Drive Fan Control Loop ****** 112 * 113 */ 114 115struct wf_smu_drive_fans_state { 116 int ticks; 117 s32 setpoint; 118 struct wf_pid_state pid; 119}; 120 121static struct wf_smu_drive_fans_state *wf_smu_drive_fans; 122 123/* 124 * ****** Slots Fan Control Loop ****** 125 * 126 */ 127 128struct wf_smu_slots_fans_state { 129 int ticks; 130 s32 setpoint; 131 struct wf_pid_state pid; 132}; 133 134static struct wf_smu_slots_fans_state *wf_smu_slots_fans; 135 136/* 137 * ***** Implementation ***** 138 * 139 */ 140 141 142static void wf_smu_create_cpu_fans(void) 143{ 144 struct wf_cpu_pid_param pid_param; 145 const struct smu_sdbp_header *hdr; 146 struct smu_sdbp_cpupiddata *piddata; 147 struct smu_sdbp_fvt *fvt; 148 s32 tmax, tdelta, maxpow, powadj; 149 150 /* First, locate the PID params in SMU SBD */ 151 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); 152 if (hdr == 0) { 153 printk(KERN_WARNING "windfarm: CPU PID fan config not found " 154 "max fan speed\n"); 155 goto fail; 156 } 157 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; 158 159 /* Get the FVT params for operating point 0 (the only supported one 160 * for now) in order to get tmax 161 */ 162 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); 163 if (hdr) { 164 fvt = (struct smu_sdbp_fvt *)&hdr[1]; 165 tmax = ((s32)fvt->maxtemp) << 16; 166 } else 167 tmax = 0x5e0000; /* 94 degree default */ 168 169 /* Alloc & initialize state */ 170 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), 171 GFP_KERNEL); 172 if (wf_smu_cpu_fans == NULL) 173 goto fail; 174 wf_smu_cpu_fans->ticks = 1; 175 176 /* Fill PID params */ 177 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; 178 pid_param.history_len = piddata->history_len; 179 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { 180 printk(KERN_WARNING "windfarm: History size overflow on " 181 "CPU control loop (%d)\n", piddata->history_len); 182 pid_param.history_len = WF_CPU_PID_MAX_HISTORY; 183 } 184 pid_param.gd = piddata->gd; 185 pid_param.gp = piddata->gp; 186 pid_param.gr = piddata->gr / pid_param.history_len; 187 188 tdelta = ((s32)piddata->target_temp_delta) << 16; 189 maxpow = ((s32)piddata->max_power) << 16; 190 powadj = ((s32)piddata->power_adj) << 16; 191 192 pid_param.tmax = tmax; 193 pid_param.ttarget = tmax - tdelta; 194 pid_param.pmaxadj = maxpow - powadj; 195 196 pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main); 197 pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main); 198 199 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); 200 201 DBG("wf: CPU Fan control initialized.\n"); 202 DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", 203 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), 204 pid_param.min, pid_param.max); 205 206 return; 207 208 fail: 209 printk(KERN_WARNING "windfarm: CPU fan config not found\n" 210 "for this machine model, max fan speed\n"); 211 212 if (cpufreq_clamp) 213 wf_control_set_max(cpufreq_clamp); 214 if (fan_cpu_main) 215 wf_control_set_max(fan_cpu_main); 216} 217 218static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) 219{ 220 s32 new_setpoint, temp, power; 221 int rc; 222 223 if (--st->ticks != 0) { 224 if (wf_smu_readjust) 225 goto readjust; 226 return; 227 } 228 st->ticks = WF_SMU_CPU_FANS_INTERVAL; 229 230 rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); 231 if (rc) { 232 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", 233 rc); 234 wf_smu_failure_state |= FAILURE_SENSOR; 235 return; 236 } 237 238 rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); 239 if (rc) { 240 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", 241 rc); 242 wf_smu_failure_state |= FAILURE_SENSOR; 243 return; 244 } 245 246 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", 247 FIX32TOPRINT(temp), FIX32TOPRINT(power)); 248 249#ifdef HACKED_OVERTEMP 250 if (temp > 0x4a0000) 251 wf_smu_failure_state |= FAILURE_OVERTEMP; 252#else 253 if (temp > st->pid.param.tmax) 254 wf_smu_failure_state |= FAILURE_OVERTEMP; 255#endif 256 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); 257 258 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); 259 260 if (st->cpu_setpoint == new_setpoint) 261 return; 262 st->cpu_setpoint = new_setpoint; 263 readjust: 264 if (fan_cpu_main && wf_smu_failure_state == 0) { 265 rc = fan_cpu_main->ops->set_value(fan_cpu_main, 266 st->cpu_setpoint); 267 if (rc) { 268 printk(KERN_WARNING "windfarm: CPU main fan" 269 " error %d\n", rc); 270 wf_smu_failure_state |= FAILURE_FAN; 271 } 272 } 273 if (fan_cpu_second && wf_smu_failure_state == 0) { 274 rc = fan_cpu_second->ops->set_value(fan_cpu_second, 275 st->cpu_setpoint); 276 if (rc) { 277 printk(KERN_WARNING "windfarm: CPU second fan" 278 " error %d\n", rc); 279 wf_smu_failure_state |= FAILURE_FAN; 280 } 281 } 282 if (fan_cpu_third && wf_smu_failure_state == 0) { 283 rc = fan_cpu_main->ops->set_value(fan_cpu_third, 284 st->cpu_setpoint); 285 if (rc) { 286 printk(KERN_WARNING "windfarm: CPU third fan" 287 " error %d\n", rc); 288 wf_smu_failure_state |= FAILURE_FAN; 289 } 290 } 291} 292 293static void wf_smu_create_drive_fans(void) 294{ 295 struct wf_pid_param param = { 296 .interval = 5, 297 .history_len = 2, 298 .gd = 0x01e00000, 299 .gp = 0x00500000, 300 .gr = 0x00000000, 301 .itarget = 0x00200000, 302 }; 303 304 /* Alloc & initialize state */ 305 wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state), 306 GFP_KERNEL); 307 if (wf_smu_drive_fans == NULL) { 308 printk(KERN_WARNING "windfarm: Memory allocation error" 309 " max fan speed\n"); 310 goto fail; 311 } 312 wf_smu_drive_fans->ticks = 1; 313 314 /* Fill PID params */ 315 param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN); 316 param.min = fan_hd->ops->get_min(fan_hd); 317 param.max = fan_hd->ops->get_max(fan_hd); 318 wf_pid_init(&wf_smu_drive_fans->pid, ¶m); 319 320 DBG("wf: Drive Fan control initialized.\n"); 321 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 322 FIX32TOPRINT(param.itarget), param.min, param.max); 323 return; 324 325 fail: 326 if (fan_hd) 327 wf_control_set_max(fan_hd); 328} 329 330static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st) 331{ 332 s32 new_setpoint, temp; 333 int rc; 334 335 if (--st->ticks != 0) { 336 if (wf_smu_readjust) 337 goto readjust; 338 return; 339 } 340 st->ticks = st->pid.param.interval; 341 342 rc = sensor_hd_temp->ops->get_value(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: Drive 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\n", (int)new_setpoint); 359 360 if (st->setpoint == new_setpoint) 361 return; 362 st->setpoint = new_setpoint; 363 readjust: 364 if (fan_hd && wf_smu_failure_state == 0) { 365 rc = fan_hd->ops->set_value(fan_hd, st->setpoint); 366 if (rc) { 367 printk(KERN_WARNING "windfarm: HD fan error %d\n", 368 rc); 369 wf_smu_failure_state |= FAILURE_FAN; 370 } 371 } 372} 373 374static void wf_smu_create_slots_fans(void) 375{ 376 struct wf_pid_param param = { 377 .interval = 1, 378 .history_len = 8, 379 .gd = 0x00000000, 380 .gp = 0x00000000, 381 .gr = 0x00020000, 382 .itarget = 0x00000000 383 }; 384 385 /* Alloc & initialize state */ 386 wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state), 387 GFP_KERNEL); 388 if (wf_smu_slots_fans == NULL) { 389 printk(KERN_WARNING "windfarm: Memory allocation error" 390 " max fan speed\n"); 391 goto fail; 392 } 393 wf_smu_slots_fans->ticks = 1; 394 395 /* Fill PID params */ 396 param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN); 397 param.min = fan_slots->ops->get_min(fan_slots); 398 param.max = fan_slots->ops->get_max(fan_slots); 399 wf_pid_init(&wf_smu_slots_fans->pid, ¶m); 400 401 DBG("wf: Slots Fan control initialized.\n"); 402 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 403 FIX32TOPRINT(param.itarget), param.min, param.max); 404 return; 405 406 fail: 407 if (fan_slots) 408 wf_control_set_max(fan_slots); 409} 410 411static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st) 412{ 413 s32 new_setpoint, power; 414 int rc; 415 416 if (--st->ticks != 0) { 417 if (wf_smu_readjust) 418 goto readjust; 419 return; 420 } 421 st->ticks = st->pid.param.interval; 422 423 rc = sensor_slots_power->ops->get_value(sensor_slots_power, &power); 424 if (rc) { 425 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n", 426 rc); 427 wf_smu_failure_state |= FAILURE_SENSOR; 428 return; 429 } 430 431 DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n", 432 FIX32TOPRINT(power)); 433 434 435 new_setpoint = wf_pid_run(&st->pid, power); 436 437 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); 438 439 if (st->setpoint == new_setpoint) 440 return; 441 st->setpoint = new_setpoint; 442 readjust: 443 if (fan_slots && wf_smu_failure_state == 0) { 444 rc = fan_slots->ops->set_value(fan_slots, st->setpoint); 445 if (rc) { 446 printk(KERN_WARNING "windfarm: Slots fan error %d\n", 447 rc); 448 wf_smu_failure_state |= FAILURE_FAN; 449 } 450 } 451} 452 453 454/* 455 * ****** Setup / Init / Misc ... ****** 456 * 457 */ 458 459static void wf_smu_tick(void) 460{ 461 unsigned int last_failure = wf_smu_failure_state; 462 unsigned int new_failure; 463 464 if (!wf_smu_started) { 465 DBG("wf: creating control loops !\n"); 466 wf_smu_create_drive_fans(); 467 wf_smu_create_slots_fans(); 468 wf_smu_create_cpu_fans(); 469 wf_smu_started = 1; 470 } 471 472 /* Skipping ticks */ 473 if (wf_smu_skipping && --wf_smu_skipping) 474 return; 475 476 wf_smu_failure_state = 0; 477 if (wf_smu_drive_fans) 478 wf_smu_drive_fans_tick(wf_smu_drive_fans); 479 if (wf_smu_slots_fans) 480 wf_smu_slots_fans_tick(wf_smu_slots_fans); 481 if (wf_smu_cpu_fans) 482 wf_smu_cpu_fans_tick(wf_smu_cpu_fans); 483 484 wf_smu_readjust = 0; 485 new_failure = wf_smu_failure_state & ~last_failure; 486 487 /* If entering failure mode, clamp cpufreq and ramp all 488 * fans to full speed. 489 */ 490 if (wf_smu_failure_state && !last_failure) { 491 if (cpufreq_clamp) 492 wf_control_set_max(cpufreq_clamp); 493 if (fan_cpu_main) 494 wf_control_set_max(fan_cpu_main); 495 if (fan_cpu_second) 496 wf_control_set_max(fan_cpu_second); 497 if (fan_cpu_third) 498 wf_control_set_max(fan_cpu_third); 499 if (fan_hd) 500 wf_control_set_max(fan_hd); 501 if (fan_slots) 502 wf_control_set_max(fan_slots); 503 } 504 505 /* If leaving failure mode, unclamp cpufreq and readjust 506 * all fans on next iteration 507 */ 508 if (!wf_smu_failure_state && last_failure) { 509 if (cpufreq_clamp) 510 wf_control_set_min(cpufreq_clamp); 511 wf_smu_readjust = 1; 512 } 513 514 /* Overtemp condition detected, notify and start skipping a couple 515 * ticks to let the temperature go down 516 */ 517 if (new_failure & FAILURE_OVERTEMP) { 518 wf_set_overtemp(); 519 wf_smu_skipping = 2; 520 } 521 522 /* We only clear the overtemp condition if overtemp is cleared 523 * _and_ no other failure is present. Since a sensor error will 524 * clear the overtemp condition (can't measure temperature) at 525 * the control loop levels, but we don't want to keep it clear 526 * here in this case 527 */ 528 if (new_failure == 0 && last_failure & FAILURE_OVERTEMP) 529 wf_clear_overtemp(); 530} 531 532 533static void wf_smu_new_control(struct wf_control *ct) 534{ 535 if (wf_smu_all_controls_ok) 536 return; 537 538 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) { 539 if (wf_get_control(ct) == 0) 540 fan_cpu_main = ct; 541 } 542 543 if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) { 544 if (wf_get_control(ct) == 0) 545 fan_cpu_second = ct; 546 } 547 548 if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) { 549 if (wf_get_control(ct) == 0) 550 fan_cpu_third = ct; 551 } 552 553 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { 554 if (wf_get_control(ct) == 0) 555 cpufreq_clamp = ct; 556 } 557 558 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { 559 if (wf_get_control(ct) == 0) 560 fan_hd = ct; 561 } 562 563 if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) { 564 if (wf_get_control(ct) == 0) 565 fan_slots = ct; 566 } 567 568 if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd && 569 fan_slots && cpufreq_clamp) 570 wf_smu_all_controls_ok = 1; 571} 572 573static void wf_smu_new_sensor(struct wf_sensor *sr) 574{ 575 if (wf_smu_all_sensors_ok) 576 return; 577 578 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { 579 if (wf_get_sensor(sr) == 0) 580 sensor_cpu_power = sr; 581 } 582 583 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { 584 if (wf_get_sensor(sr) == 0) 585 sensor_cpu_temp = sr; 586 } 587 588 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { 589 if (wf_get_sensor(sr) == 0) 590 sensor_hd_temp = sr; 591 } 592 593 if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) { 594 if (wf_get_sensor(sr) == 0) 595 sensor_slots_power = sr; 596 } 597 598 if (sensor_cpu_power && sensor_cpu_temp && 599 sensor_hd_temp && sensor_slots_power) 600 wf_smu_all_sensors_ok = 1; 601} 602 603 604static int wf_smu_notify(struct notifier_block *self, 605 unsigned long event, void *data) 606{ 607 switch(event) { 608 case WF_EVENT_NEW_CONTROL: 609 DBG("wf: new control %s detected\n", 610 ((struct wf_control *)data)->name); 611 wf_smu_new_control(data); 612 wf_smu_readjust = 1; 613 break; 614 case WF_EVENT_NEW_SENSOR: 615 DBG("wf: new sensor %s detected\n", 616 ((struct wf_sensor *)data)->name); 617 wf_smu_new_sensor(data); 618 break; 619 case WF_EVENT_TICK: 620 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) 621 wf_smu_tick(); 622 } 623 624 return 0; 625} 626 627static struct notifier_block wf_smu_events = { 628 .notifier_call = wf_smu_notify, 629}; 630 631static int wf_init_pm(void) 632{ 633 printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); 634 635 return 0; 636} 637 638static int wf_smu_probe(struct platform_device *ddev) 639{ 640 wf_register_client(&wf_smu_events); 641 642 return 0; 643} 644 645static int __devexit wf_smu_remove(struct platform_device *ddev) 646{ 647 wf_unregister_client(&wf_smu_events); 648 649 msleep(1000); 650 651 /* Release all sensors */ 652 /* One more crappy race: I don't think we have any guarantee here 653 * that the attribute callback won't race with the sensor beeing 654 * disposed of, and I'm not 100% certain what best way to deal 655 * with that except by adding locks all over... I'll do that 656 * eventually but heh, who ever rmmod this module anyway ? 657 */ 658 if (sensor_cpu_power) 659 wf_put_sensor(sensor_cpu_power); 660 if (sensor_cpu_temp) 661 wf_put_sensor(sensor_cpu_temp); 662 if (sensor_hd_temp) 663 wf_put_sensor(sensor_hd_temp); 664 if (sensor_slots_power) 665 wf_put_sensor(sensor_slots_power); 666 667 /* Release all controls */ 668 if (fan_cpu_main) 669 wf_put_control(fan_cpu_main); 670 if (fan_cpu_second) 671 wf_put_control(fan_cpu_second); 672 if (fan_cpu_third) 673 wf_put_control(fan_cpu_third); 674 if (fan_hd) 675 wf_put_control(fan_hd); 676 if (fan_slots) 677 wf_put_control(fan_slots); 678 if (cpufreq_clamp) 679 wf_put_control(cpufreq_clamp); 680 681 /* Destroy control loops state structures */ 682 kfree(wf_smu_slots_fans); 683 kfree(wf_smu_drive_fans); 684 kfree(wf_smu_cpu_fans); 685 686 return 0; 687} 688 689static struct platform_driver wf_smu_driver = { 690 .probe = wf_smu_probe, 691 .remove = __devexit_p(wf_smu_remove), 692 .driver = { 693 .name = "windfarm", 694 .owner = THIS_MODULE, 695 }, 696}; 697 698 699static int __init wf_smu_init(void) 700{ 701 int rc = -ENODEV; 702 703 if (of_machine_is_compatible("PowerMac9,1")) 704 rc = wf_init_pm(); 705 706 if (rc == 0) { 707#ifdef MODULE 708 request_module("windfarm_smu_controls"); 709 request_module("windfarm_smu_sensors"); 710 request_module("windfarm_lm75_sensor"); 711 request_module("windfarm_cpufreq_clamp"); 712 713#endif /* MODULE */ 714 platform_driver_register(&wf_smu_driver); 715 } 716 717 return rc; 718} 719 720static void __exit wf_smu_exit(void) 721{ 722 723 platform_driver_unregister(&wf_smu_driver); 724} 725 726 727module_init(wf_smu_init); 728module_exit(wf_smu_exit); 729 730MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); 731MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); 732MODULE_LICENSE("GPL"); 733 734MODULE_ALIAS("platform:windfarm"); 735