1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Windfarm PowerMac thermal control. SMU based 1 CPU desktop control loops 4 * 5 * (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp. 6 * <benh@kernel.crashing.org> 7 * 8 * The algorithm used is the PID control algorithm, used the same 9 * way the published Darwin code does, using the same values that 10 * are present in the Darwin 8.2 snapshot property lists (note however 11 * that none of the code has been re-used, it's a complete re-implementation 12 * 13 * The various control loops found in Darwin config file are: 14 * 15 * PowerMac9,1 16 * =========== 17 * 18 * Has 3 control loops: CPU fans is similar to PowerMac8,1 (though it doesn't 19 * try to play with other control loops fans). Drive bay is rather basic PID 20 * with one sensor and one fan. Slots area is a bit different as the Darwin 21 * driver is supposed to be capable of working in a special "AGP" mode which 22 * involves the presence of an AGP sensor and an AGP fan (possibly on the 23 * AGP card itself). I can't deal with that special mode as I don't have 24 * access to those additional sensor/fans for now (though ultimately, it would 25 * be possible to add sensor objects for them) so I'm only implementing the 26 * basic PCI slot control loop 27 */ 28 29 #include <linux/types.h> 30 #include <linux/errno.h> 31 #include <linux/kernel.h> 32 #include <linux/delay.h> 33 #include <linux/slab.h> 34 #include <linux/init.h> 35 #include <linux/spinlock.h> 36 #include <linux/wait.h> 37 #include <linux/kmod.h> 38 #include <linux/device.h> 39 #include <linux/platform_device.h> 40 #include <linux/of.h> 41 42 #include <asm/machdep.h> 43 #include <asm/io.h> 44 #include <asm/sections.h> 45 #include <asm/smu.h> 46 47 #include "windfarm.h" 48 #include "windfarm_pid.h" 49 50 #define VERSION "0.4" 51 52 #undef DEBUG 53 54 #ifdef DEBUG 55 #define DBG(args...) printk(args) 56 #else 57 #define DBG(args...) do { } while(0) 58 #endif 59 60 /* define this to force CPU overtemp to 74 degree, useful for testing 61 * the overtemp code 62 */ 63 #undef HACKED_OVERTEMP 64 65 /* Controls & sensors */ 66 static struct wf_sensor *sensor_cpu_power; 67 static struct wf_sensor *sensor_cpu_temp; 68 static struct wf_sensor *sensor_hd_temp; 69 static struct wf_sensor *sensor_slots_power; 70 static struct wf_control *fan_cpu_main; 71 static struct wf_control *fan_cpu_second; 72 static struct wf_control *fan_cpu_third; 73 static struct wf_control *fan_hd; 74 static struct wf_control *fan_slots; 75 static struct wf_control *cpufreq_clamp; 76 77 /* Set to kick the control loop into life */ 78 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok; 79 static bool wf_smu_started; 80 static bool wf_smu_overtemp; 81 82 /* Failure handling.. could be nicer */ 83 #define FAILURE_FAN 0x01 84 #define FAILURE_SENSOR 0x02 85 #define FAILURE_OVERTEMP 0x04 86 87 static unsigned int wf_smu_failure_state; 88 static int wf_smu_readjust, wf_smu_skipping; 89 90 /* 91 * ****** CPU Fans Control Loop ****** 92 * 93 */ 94 95 96 #define WF_SMU_CPU_FANS_INTERVAL 1 97 #define WF_SMU_CPU_FANS_MAX_HISTORY 16 98 99 /* State data used by the cpu fans control loop 100 */ 101 struct wf_smu_cpu_fans_state { 102 int ticks; 103 s32 cpu_setpoint; 104 struct wf_cpu_pid_state pid; 105 }; 106 107 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; 108 109 110 111 /* 112 * ****** Drive Fan Control Loop ****** 113 * 114 */ 115 116 struct wf_smu_drive_fans_state { 117 int ticks; 118 s32 setpoint; 119 struct wf_pid_state pid; 120 }; 121 122 static struct wf_smu_drive_fans_state *wf_smu_drive_fans; 123 124 /* 125 * ****** Slots Fan Control Loop ****** 126 * 127 */ 128 129 struct wf_smu_slots_fans_state { 130 int ticks; 131 s32 setpoint; 132 struct wf_pid_state pid; 133 }; 134 135 static struct wf_smu_slots_fans_state *wf_smu_slots_fans; 136 137 /* 138 * ***** Implementation ***** 139 * 140 */ 141 142 143 static void wf_smu_create_cpu_fans(void) 144 { 145 struct wf_cpu_pid_param pid_param; 146 const struct smu_sdbp_header *hdr; 147 struct smu_sdbp_cpupiddata *piddata; 148 struct smu_sdbp_fvt *fvt; 149 s32 tmax, tdelta, maxpow, powadj; 150 151 /* First, locate the PID params in SMU SBD */ 152 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); 153 if (!hdr) { 154 printk(KERN_WARNING "windfarm: CPU PID fan config not found " 155 "max fan speed\n"); 156 goto fail; 157 } 158 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; 159 160 /* Get the FVT params for operating point 0 (the only supported one 161 * for now) in order to get tmax 162 */ 163 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); 164 if (hdr) { 165 fvt = (struct smu_sdbp_fvt *)&hdr[1]; 166 tmax = ((s32)fvt->maxtemp) << 16; 167 } else 168 tmax = 0x5e0000; /* 94 degree default */ 169 170 /* Alloc & initialize state */ 171 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), 172 GFP_KERNEL); 173 if (wf_smu_cpu_fans == NULL) 174 goto fail; 175 wf_smu_cpu_fans->ticks = 1; 176 177 /* Fill PID params */ 178 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; 179 pid_param.history_len = piddata->history_len; 180 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { 181 printk(KERN_WARNING "windfarm: History size overflow on " 182 "CPU control loop (%d)\n", piddata->history_len); 183 pid_param.history_len = WF_CPU_PID_MAX_HISTORY; 184 } 185 pid_param.gd = piddata->gd; 186 pid_param.gp = piddata->gp; 187 pid_param.gr = piddata->gr / pid_param.history_len; 188 189 tdelta = ((s32)piddata->target_temp_delta) << 16; 190 maxpow = ((s32)piddata->max_power) << 16; 191 powadj = ((s32)piddata->power_adj) << 16; 192 193 pid_param.tmax = tmax; 194 pid_param.ttarget = tmax - tdelta; 195 pid_param.pmaxadj = maxpow - powadj; 196 197 pid_param.min = wf_control_get_min(fan_cpu_main); 198 pid_param.max = wf_control_get_max(fan_cpu_main); 199 200 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); 201 202 DBG("wf: CPU Fan control initialized.\n"); 203 DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", 204 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), 205 pid_param.min, pid_param.max); 206 207 return; 208 209 fail: 210 printk(KERN_WARNING "windfarm: CPU fan config not found\n" 211 "for this machine model, max fan speed\n"); 212 213 if (cpufreq_clamp) 214 wf_control_set_max(cpufreq_clamp); 215 if (fan_cpu_main) 216 wf_control_set_max(fan_cpu_main); 217 } 218 219 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) 220 { 221 s32 new_setpoint, temp, power; 222 int rc; 223 224 if (--st->ticks != 0) { 225 if (wf_smu_readjust) 226 goto readjust; 227 return; 228 } 229 st->ticks = WF_SMU_CPU_FANS_INTERVAL; 230 231 rc = wf_sensor_get(sensor_cpu_temp, &temp); 232 if (rc) { 233 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", 234 rc); 235 wf_smu_failure_state |= FAILURE_SENSOR; 236 return; 237 } 238 239 rc = wf_sensor_get(sensor_cpu_power, &power); 240 if (rc) { 241 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", 242 rc); 243 wf_smu_failure_state |= FAILURE_SENSOR; 244 return; 245 } 246 247 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", 248 FIX32TOPRINT(temp), FIX32TOPRINT(power)); 249 250 #ifdef HACKED_OVERTEMP 251 if (temp > 0x4a0000) 252 wf_smu_failure_state |= FAILURE_OVERTEMP; 253 #else 254 if (temp > st->pid.param.tmax) 255 wf_smu_failure_state |= FAILURE_OVERTEMP; 256 #endif 257 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); 258 259 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); 260 261 if (st->cpu_setpoint == new_setpoint) 262 return; 263 st->cpu_setpoint = new_setpoint; 264 readjust: 265 if (fan_cpu_main && wf_smu_failure_state == 0) { 266 rc = wf_control_set(fan_cpu_main, 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 = wf_control_set(fan_cpu_second, st->cpu_setpoint); 275 if (rc) { 276 printk(KERN_WARNING "windfarm: CPU second fan" 277 " error %d\n", rc); 278 wf_smu_failure_state |= FAILURE_FAN; 279 } 280 } 281 if (fan_cpu_third && wf_smu_failure_state == 0) { 282 rc = wf_control_set(fan_cpu_third, st->cpu_setpoint); 283 if (rc) { 284 printk(KERN_WARNING "windfarm: CPU third fan" 285 " error %d\n", rc); 286 wf_smu_failure_state |= FAILURE_FAN; 287 } 288 } 289 } 290 291 static void wf_smu_create_drive_fans(void) 292 { 293 struct wf_pid_param param = { 294 .interval = 5, 295 .history_len = 2, 296 .gd = 0x01e00000, 297 .gp = 0x00500000, 298 .gr = 0x00000000, 299 .itarget = 0x00200000, 300 }; 301 302 /* Alloc & initialize state */ 303 wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state), 304 GFP_KERNEL); 305 if (wf_smu_drive_fans == NULL) { 306 printk(KERN_WARNING "windfarm: Memory allocation error" 307 " max fan speed\n"); 308 goto fail; 309 } 310 wf_smu_drive_fans->ticks = 1; 311 312 /* Fill PID params */ 313 param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN); 314 param.min = wf_control_get_min(fan_hd); 315 param.max = wf_control_get_max(fan_hd); 316 wf_pid_init(&wf_smu_drive_fans->pid, ¶m); 317 318 DBG("wf: Drive Fan control initialized.\n"); 319 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 320 FIX32TOPRINT(param.itarget), param.min, param.max); 321 return; 322 323 fail: 324 if (fan_hd) 325 wf_control_set_max(fan_hd); 326 } 327 328 static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st) 329 { 330 s32 new_setpoint, temp; 331 int rc; 332 333 if (--st->ticks != 0) { 334 if (wf_smu_readjust) 335 goto readjust; 336 return; 337 } 338 st->ticks = st->pid.param.interval; 339 340 rc = wf_sensor_get(sensor_hd_temp, &temp); 341 if (rc) { 342 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", 343 rc); 344 wf_smu_failure_state |= FAILURE_SENSOR; 345 return; 346 } 347 348 DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n", 349 FIX32TOPRINT(temp)); 350 351 if (temp > (st->pid.param.itarget + 0x50000)) 352 wf_smu_failure_state |= FAILURE_OVERTEMP; 353 354 new_setpoint = wf_pid_run(&st->pid, temp); 355 356 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); 357 358 if (st->setpoint == new_setpoint) 359 return; 360 st->setpoint = new_setpoint; 361 readjust: 362 if (fan_hd && wf_smu_failure_state == 0) { 363 rc = wf_control_set(fan_hd, st->setpoint); 364 if (rc) { 365 printk(KERN_WARNING "windfarm: HD fan error %d\n", 366 rc); 367 wf_smu_failure_state |= FAILURE_FAN; 368 } 369 } 370 } 371 372 static void wf_smu_create_slots_fans(void) 373 { 374 struct wf_pid_param param = { 375 .interval = 1, 376 .history_len = 8, 377 .gd = 0x00000000, 378 .gp = 0x00000000, 379 .gr = 0x00020000, 380 .itarget = 0x00000000 381 }; 382 383 /* Alloc & initialize state */ 384 wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state), 385 GFP_KERNEL); 386 if (wf_smu_slots_fans == NULL) { 387 printk(KERN_WARNING "windfarm: Memory allocation error" 388 " max fan speed\n"); 389 goto fail; 390 } 391 wf_smu_slots_fans->ticks = 1; 392 393 /* Fill PID params */ 394 param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN); 395 param.min = wf_control_get_min(fan_slots); 396 param.max = wf_control_get_max(fan_slots); 397 wf_pid_init(&wf_smu_slots_fans->pid, ¶m); 398 399 DBG("wf: Slots Fan control initialized.\n"); 400 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 401 FIX32TOPRINT(param.itarget), param.min, param.max); 402 return; 403 404 fail: 405 if (fan_slots) 406 wf_control_set_max(fan_slots); 407 } 408 409 static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st) 410 { 411 s32 new_setpoint, power; 412 int rc; 413 414 if (--st->ticks != 0) { 415 if (wf_smu_readjust) 416 goto readjust; 417 return; 418 } 419 st->ticks = st->pid.param.interval; 420 421 rc = wf_sensor_get(sensor_slots_power, &power); 422 if (rc) { 423 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n", 424 rc); 425 wf_smu_failure_state |= FAILURE_SENSOR; 426 return; 427 } 428 429 DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n", 430 FIX32TOPRINT(power)); 431 432 #if 0 /* Check what makes a good overtemp condition */ 433 if (power > (st->pid.param.itarget + 0x50000)) 434 wf_smu_failure_state |= FAILURE_OVERTEMP; 435 #endif 436 437 new_setpoint = wf_pid_run(&st->pid, power); 438 439 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); 440 441 if (st->setpoint == new_setpoint) 442 return; 443 st->setpoint = new_setpoint; 444 readjust: 445 if (fan_slots && wf_smu_failure_state == 0) { 446 rc = wf_control_set(fan_slots, st->setpoint); 447 if (rc) { 448 printk(KERN_WARNING "windfarm: Slots fan error %d\n", 449 rc); 450 wf_smu_failure_state |= FAILURE_FAN; 451 } 452 } 453 } 454 455 456 /* 457 * ****** Setup / Init / Misc ... ****** 458 * 459 */ 460 461 static void wf_smu_tick(void) 462 { 463 unsigned int last_failure = wf_smu_failure_state; 464 unsigned int new_failure; 465 466 if (!wf_smu_started) { 467 DBG("wf: creating control loops !\n"); 468 wf_smu_create_drive_fans(); 469 wf_smu_create_slots_fans(); 470 wf_smu_create_cpu_fans(); 471 wf_smu_started = true; 472 } 473 474 /* Skipping ticks */ 475 if (wf_smu_skipping && --wf_smu_skipping) 476 return; 477 478 wf_smu_failure_state = 0; 479 if (wf_smu_drive_fans) 480 wf_smu_drive_fans_tick(wf_smu_drive_fans); 481 if (wf_smu_slots_fans) 482 wf_smu_slots_fans_tick(wf_smu_slots_fans); 483 if (wf_smu_cpu_fans) 484 wf_smu_cpu_fans_tick(wf_smu_cpu_fans); 485 486 wf_smu_readjust = 0; 487 new_failure = wf_smu_failure_state & ~last_failure; 488 489 /* If entering failure mode, clamp cpufreq and ramp all 490 * fans to full speed. 491 */ 492 if (wf_smu_failure_state && !last_failure) { 493 if (cpufreq_clamp) 494 wf_control_set_max(cpufreq_clamp); 495 if (fan_cpu_main) 496 wf_control_set_max(fan_cpu_main); 497 if (fan_cpu_second) 498 wf_control_set_max(fan_cpu_second); 499 if (fan_cpu_third) 500 wf_control_set_max(fan_cpu_third); 501 if (fan_hd) 502 wf_control_set_max(fan_hd); 503 if (fan_slots) 504 wf_control_set_max(fan_slots); 505 } 506 507 /* If leaving failure mode, unclamp cpufreq and readjust 508 * all fans on next iteration 509 */ 510 if (!wf_smu_failure_state && last_failure) { 511 if (cpufreq_clamp) 512 wf_control_set_min(cpufreq_clamp); 513 wf_smu_readjust = 1; 514 } 515 516 /* Overtemp condition detected, notify and start skipping a couple 517 * ticks to let the temperature go down 518 */ 519 if (new_failure & FAILURE_OVERTEMP) { 520 wf_set_overtemp(); 521 wf_smu_skipping = 2; 522 wf_smu_overtemp = true; 523 } 524 525 /* We only clear the overtemp condition if overtemp is cleared 526 * _and_ no other failure is present. Since a sensor error will 527 * clear the overtemp condition (can't measure temperature) at 528 * the control loop levels, but we don't want to keep it clear 529 * here in this case 530 */ 531 if (!wf_smu_failure_state && wf_smu_overtemp) { 532 wf_clear_overtemp(); 533 wf_smu_overtemp = false; 534 } 535 } 536 537 538 static void wf_smu_new_control(struct wf_control *ct) 539 { 540 if (wf_smu_all_controls_ok) 541 return; 542 543 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) { 544 if (wf_get_control(ct) == 0) 545 fan_cpu_main = ct; 546 } 547 548 if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) { 549 if (wf_get_control(ct) == 0) 550 fan_cpu_second = ct; 551 } 552 553 if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) { 554 if (wf_get_control(ct) == 0) 555 fan_cpu_third = ct; 556 } 557 558 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { 559 if (wf_get_control(ct) == 0) 560 cpufreq_clamp = ct; 561 } 562 563 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { 564 if (wf_get_control(ct) == 0) 565 fan_hd = ct; 566 } 567 568 if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) { 569 if (wf_get_control(ct) == 0) 570 fan_slots = ct; 571 } 572 573 if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd && 574 fan_slots && cpufreq_clamp) 575 wf_smu_all_controls_ok = 1; 576 } 577 578 static void wf_smu_new_sensor(struct wf_sensor *sr) 579 { 580 if (wf_smu_all_sensors_ok) 581 return; 582 583 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { 584 if (wf_get_sensor(sr) == 0) 585 sensor_cpu_power = sr; 586 } 587 588 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { 589 if (wf_get_sensor(sr) == 0) 590 sensor_cpu_temp = sr; 591 } 592 593 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { 594 if (wf_get_sensor(sr) == 0) 595 sensor_hd_temp = sr; 596 } 597 598 if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) { 599 if (wf_get_sensor(sr) == 0) 600 sensor_slots_power = sr; 601 } 602 603 if (sensor_cpu_power && sensor_cpu_temp && 604 sensor_hd_temp && sensor_slots_power) 605 wf_smu_all_sensors_ok = 1; 606 } 607 608 609 static int wf_smu_notify(struct notifier_block *self, 610 unsigned long event, void *data) 611 { 612 switch(event) { 613 case WF_EVENT_NEW_CONTROL: 614 DBG("wf: new control %s detected\n", 615 ((struct wf_control *)data)->name); 616 wf_smu_new_control(data); 617 wf_smu_readjust = 1; 618 break; 619 case WF_EVENT_NEW_SENSOR: 620 DBG("wf: new sensor %s detected\n", 621 ((struct wf_sensor *)data)->name); 622 wf_smu_new_sensor(data); 623 break; 624 case WF_EVENT_TICK: 625 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) 626 wf_smu_tick(); 627 } 628 629 return 0; 630 } 631 632 static struct notifier_block wf_smu_events = { 633 .notifier_call = wf_smu_notify, 634 }; 635 636 static int wf_init_pm(void) 637 { 638 printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); 639 640 return 0; 641 } 642 643 static int wf_smu_probe(struct platform_device *ddev) 644 { 645 wf_register_client(&wf_smu_events); 646 647 return 0; 648 } 649 650 static int wf_smu_remove(struct platform_device *ddev) 651 { 652 wf_unregister_client(&wf_smu_events); 653 654 /* XXX We don't have yet a guarantee that our callback isn't 655 * in progress when returning from wf_unregister_client, so 656 * we add an arbitrary delay. I'll have to fix that in the core 657 */ 658 msleep(1000); 659 660 /* Release all sensors */ 661 /* One more crappy race: I don't think we have any guarantee here 662 * that the attribute callback won't race with the sensor beeing 663 * disposed of, and I'm not 100% certain what best way to deal 664 * with that except by adding locks all over... I'll do that 665 * eventually but heh, who ever rmmod this module anyway ? 666 */ 667 if (sensor_cpu_power) 668 wf_put_sensor(sensor_cpu_power); 669 if (sensor_cpu_temp) 670 wf_put_sensor(sensor_cpu_temp); 671 if (sensor_hd_temp) 672 wf_put_sensor(sensor_hd_temp); 673 if (sensor_slots_power) 674 wf_put_sensor(sensor_slots_power); 675 676 /* Release all controls */ 677 if (fan_cpu_main) 678 wf_put_control(fan_cpu_main); 679 if (fan_cpu_second) 680 wf_put_control(fan_cpu_second); 681 if (fan_cpu_third) 682 wf_put_control(fan_cpu_third); 683 if (fan_hd) 684 wf_put_control(fan_hd); 685 if (fan_slots) 686 wf_put_control(fan_slots); 687 if (cpufreq_clamp) 688 wf_put_control(cpufreq_clamp); 689 690 /* Destroy control loops state structures */ 691 kfree(wf_smu_slots_fans); 692 kfree(wf_smu_drive_fans); 693 kfree(wf_smu_cpu_fans); 694 695 return 0; 696 } 697 698 static struct platform_driver wf_smu_driver = { 699 .probe = wf_smu_probe, 700 .remove = wf_smu_remove, 701 .driver = { 702 .name = "windfarm", 703 }, 704 }; 705 706 707 static int __init wf_smu_init(void) 708 { 709 int rc = -ENODEV; 710 711 if (of_machine_is_compatible("PowerMac9,1")) 712 rc = wf_init_pm(); 713 714 if (rc == 0) { 715 #ifdef MODULE 716 request_module("windfarm_smu_controls"); 717 request_module("windfarm_smu_sensors"); 718 request_module("windfarm_lm75_sensor"); 719 request_module("windfarm_cpufreq_clamp"); 720 721 #endif /* MODULE */ 722 platform_driver_register(&wf_smu_driver); 723 } 724 725 return rc; 726 } 727 728 static void __exit wf_smu_exit(void) 729 { 730 731 platform_driver_unregister(&wf_smu_driver); 732 } 733 734 735 module_init(wf_smu_init); 736 module_exit(wf_smu_exit); 737 738 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); 739 MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); 740 MODULE_LICENSE("GPL"); 741 742 MODULE_ALIAS("platform:windfarm"); 743