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_obj(struct wf_smu_cpu_fans_state); 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 = wf_control_get_min(fan_cpu_main); 197 pid_param.max = wf_control_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(" ttarget=%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 } 217 218 static 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 = wf_sensor_get(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 = wf_sensor_get(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 = wf_control_set(fan_cpu_main, st->cpu_setpoint); 266 if (rc) { 267 printk(KERN_WARNING "windfarm: CPU main fan" 268 " error %d\n", rc); 269 wf_smu_failure_state |= FAILURE_FAN; 270 } 271 } 272 if (fan_cpu_second && wf_smu_failure_state == 0) { 273 rc = wf_control_set(fan_cpu_second, st->cpu_setpoint); 274 if (rc) { 275 printk(KERN_WARNING "windfarm: CPU second fan" 276 " error %d\n", rc); 277 wf_smu_failure_state |= FAILURE_FAN; 278 } 279 } 280 if (fan_cpu_third && wf_smu_failure_state == 0) { 281 rc = wf_control_set(fan_cpu_third, st->cpu_setpoint); 282 if (rc) { 283 printk(KERN_WARNING "windfarm: CPU third fan" 284 " error %d\n", rc); 285 wf_smu_failure_state |= FAILURE_FAN; 286 } 287 } 288 } 289 290 static void wf_smu_create_drive_fans(void) 291 { 292 struct wf_pid_param param = { 293 .interval = 5, 294 .history_len = 2, 295 .gd = 0x01e00000, 296 .gp = 0x00500000, 297 .gr = 0x00000000, 298 .itarget = 0x00200000, 299 }; 300 301 /* Alloc & initialize state */ 302 wf_smu_drive_fans = kmalloc_obj(struct wf_smu_drive_fans_state); 303 if (wf_smu_drive_fans == NULL) { 304 printk(KERN_WARNING "windfarm: Memory allocation error" 305 " max fan speed\n"); 306 goto fail; 307 } 308 wf_smu_drive_fans->ticks = 1; 309 310 /* Fill PID params */ 311 param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN); 312 param.min = wf_control_get_min(fan_hd); 313 param.max = wf_control_get_max(fan_hd); 314 wf_pid_init(&wf_smu_drive_fans->pid, ¶m); 315 316 DBG("wf: Drive Fan control initialized.\n"); 317 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 318 FIX32TOPRINT(param.itarget), param.min, param.max); 319 return; 320 321 fail: 322 if (fan_hd) 323 wf_control_set_max(fan_hd); 324 } 325 326 static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st) 327 { 328 s32 new_setpoint, temp; 329 int rc; 330 331 if (--st->ticks != 0) { 332 if (wf_smu_readjust) 333 goto readjust; 334 return; 335 } 336 st->ticks = st->pid.param.interval; 337 338 rc = wf_sensor_get(sensor_hd_temp, &temp); 339 if (rc) { 340 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", 341 rc); 342 wf_smu_failure_state |= FAILURE_SENSOR; 343 return; 344 } 345 346 DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n", 347 FIX32TOPRINT(temp)); 348 349 if (temp > (st->pid.param.itarget + 0x50000)) 350 wf_smu_failure_state |= FAILURE_OVERTEMP; 351 352 new_setpoint = wf_pid_run(&st->pid, temp); 353 354 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); 355 356 if (st->setpoint == new_setpoint) 357 return; 358 st->setpoint = new_setpoint; 359 readjust: 360 if (fan_hd && wf_smu_failure_state == 0) { 361 rc = wf_control_set(fan_hd, st->setpoint); 362 if (rc) { 363 printk(KERN_WARNING "windfarm: HD fan error %d\n", 364 rc); 365 wf_smu_failure_state |= FAILURE_FAN; 366 } 367 } 368 } 369 370 static void wf_smu_create_slots_fans(void) 371 { 372 struct wf_pid_param param = { 373 .interval = 1, 374 .history_len = 8, 375 .gd = 0x00000000, 376 .gp = 0x00000000, 377 .gr = 0x00020000, 378 .itarget = 0x00000000 379 }; 380 381 /* Alloc & initialize state */ 382 wf_smu_slots_fans = kmalloc_obj(struct wf_smu_slots_fans_state); 383 if (wf_smu_slots_fans == NULL) { 384 printk(KERN_WARNING "windfarm: Memory allocation error" 385 " max fan speed\n"); 386 goto fail; 387 } 388 wf_smu_slots_fans->ticks = 1; 389 390 /* Fill PID params */ 391 param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN); 392 param.min = wf_control_get_min(fan_slots); 393 param.max = wf_control_get_max(fan_slots); 394 wf_pid_init(&wf_smu_slots_fans->pid, ¶m); 395 396 DBG("wf: Slots Fan control initialized.\n"); 397 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 398 FIX32TOPRINT(param.itarget), param.min, param.max); 399 return; 400 401 fail: 402 if (fan_slots) 403 wf_control_set_max(fan_slots); 404 } 405 406 static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st) 407 { 408 s32 new_setpoint, power; 409 int rc; 410 411 if (--st->ticks != 0) { 412 if (wf_smu_readjust) 413 goto readjust; 414 return; 415 } 416 st->ticks = st->pid.param.interval; 417 418 rc = wf_sensor_get(sensor_slots_power, &power); 419 if (rc) { 420 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n", 421 rc); 422 wf_smu_failure_state |= FAILURE_SENSOR; 423 return; 424 } 425 426 DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n", 427 FIX32TOPRINT(power)); 428 429 #if 0 /* Check what makes a good overtemp condition */ 430 if (power > (st->pid.param.itarget + 0x50000)) 431 wf_smu_failure_state |= FAILURE_OVERTEMP; 432 #endif 433 434 new_setpoint = wf_pid_run(&st->pid, power); 435 436 DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint); 437 438 if (st->setpoint == new_setpoint) 439 return; 440 st->setpoint = new_setpoint; 441 readjust: 442 if (fan_slots && wf_smu_failure_state == 0) { 443 rc = wf_control_set(fan_slots, st->setpoint); 444 if (rc) { 445 printk(KERN_WARNING "windfarm: Slots fan error %d\n", 446 rc); 447 wf_smu_failure_state |= FAILURE_FAN; 448 } 449 } 450 } 451 452 453 /* 454 * ****** Setup / Init / Misc ... ****** 455 * 456 */ 457 458 static void wf_smu_tick(void) 459 { 460 unsigned int last_failure = wf_smu_failure_state; 461 unsigned int new_failure; 462 463 if (!wf_smu_started) { 464 DBG("wf: creating control loops !\n"); 465 wf_smu_create_drive_fans(); 466 wf_smu_create_slots_fans(); 467 wf_smu_create_cpu_fans(); 468 wf_smu_started = true; 469 } 470 471 /* Skipping ticks */ 472 if (wf_smu_skipping && --wf_smu_skipping) 473 return; 474 475 wf_smu_failure_state = 0; 476 if (wf_smu_drive_fans) 477 wf_smu_drive_fans_tick(wf_smu_drive_fans); 478 if (wf_smu_slots_fans) 479 wf_smu_slots_fans_tick(wf_smu_slots_fans); 480 if (wf_smu_cpu_fans) 481 wf_smu_cpu_fans_tick(wf_smu_cpu_fans); 482 483 wf_smu_readjust = 0; 484 new_failure = wf_smu_failure_state & ~last_failure; 485 486 /* If entering failure mode, clamp cpufreq and ramp all 487 * fans to full speed. 488 */ 489 if (wf_smu_failure_state && !last_failure) { 490 if (cpufreq_clamp) 491 wf_control_set_max(cpufreq_clamp); 492 if (fan_cpu_main) 493 wf_control_set_max(fan_cpu_main); 494 if (fan_cpu_second) 495 wf_control_set_max(fan_cpu_second); 496 if (fan_cpu_third) 497 wf_control_set_max(fan_cpu_third); 498 if (fan_hd) 499 wf_control_set_max(fan_hd); 500 if (fan_slots) 501 wf_control_set_max(fan_slots); 502 } 503 504 /* If leaving failure mode, unclamp cpufreq and readjust 505 * all fans on next iteration 506 */ 507 if (!wf_smu_failure_state && last_failure) { 508 if (cpufreq_clamp) 509 wf_control_set_min(cpufreq_clamp); 510 wf_smu_readjust = 1; 511 } 512 513 /* Overtemp condition detected, notify and start skipping a couple 514 * ticks to let the temperature go down 515 */ 516 if (new_failure & FAILURE_OVERTEMP) { 517 wf_set_overtemp(); 518 wf_smu_skipping = 2; 519 wf_smu_overtemp = true; 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 (!wf_smu_failure_state && wf_smu_overtemp) { 529 wf_clear_overtemp(); 530 wf_smu_overtemp = false; 531 } 532 } 533 534 535 static void wf_smu_new_control(struct wf_control *ct) 536 { 537 if (wf_smu_all_controls_ok) 538 return; 539 540 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) { 541 if (wf_get_control(ct) == 0) 542 fan_cpu_main = ct; 543 } 544 545 if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) { 546 if (wf_get_control(ct) == 0) 547 fan_cpu_second = ct; 548 } 549 550 if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) { 551 if (wf_get_control(ct) == 0) 552 fan_cpu_third = ct; 553 } 554 555 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { 556 if (wf_get_control(ct) == 0) 557 cpufreq_clamp = ct; 558 } 559 560 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { 561 if (wf_get_control(ct) == 0) 562 fan_hd = ct; 563 } 564 565 if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) { 566 if (wf_get_control(ct) == 0) 567 fan_slots = ct; 568 } 569 570 if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd && 571 fan_slots && cpufreq_clamp) 572 wf_smu_all_controls_ok = 1; 573 } 574 575 static void wf_smu_new_sensor(struct wf_sensor *sr) 576 { 577 if (wf_smu_all_sensors_ok) 578 return; 579 580 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { 581 if (wf_get_sensor(sr) == 0) 582 sensor_cpu_power = sr; 583 } 584 585 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { 586 if (wf_get_sensor(sr) == 0) 587 sensor_cpu_temp = sr; 588 } 589 590 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { 591 if (wf_get_sensor(sr) == 0) 592 sensor_hd_temp = sr; 593 } 594 595 if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) { 596 if (wf_get_sensor(sr) == 0) 597 sensor_slots_power = sr; 598 } 599 600 if (sensor_cpu_power && sensor_cpu_temp && 601 sensor_hd_temp && sensor_slots_power) 602 wf_smu_all_sensors_ok = 1; 603 } 604 605 606 static int wf_smu_notify(struct notifier_block *self, 607 unsigned long event, void *data) 608 { 609 switch(event) { 610 case WF_EVENT_NEW_CONTROL: 611 DBG("wf: new control %s detected\n", 612 ((struct wf_control *)data)->name); 613 wf_smu_new_control(data); 614 wf_smu_readjust = 1; 615 break; 616 case WF_EVENT_NEW_SENSOR: 617 DBG("wf: new sensor %s detected\n", 618 ((struct wf_sensor *)data)->name); 619 wf_smu_new_sensor(data); 620 break; 621 case WF_EVENT_TICK: 622 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) 623 wf_smu_tick(); 624 } 625 626 return 0; 627 } 628 629 static struct notifier_block wf_smu_events = { 630 .notifier_call = wf_smu_notify, 631 }; 632 633 static int wf_init_pm(void) 634 { 635 printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); 636 637 return 0; 638 } 639 640 static int wf_smu_probe(struct platform_device *ddev) 641 { 642 wf_register_client(&wf_smu_events); 643 644 return 0; 645 } 646 647 static void wf_smu_remove(struct platform_device *ddev) 648 { 649 wf_unregister_client(&wf_smu_events); 650 651 /* XXX We don't have yet a guarantee that our callback isn't 652 * in progress when returning from wf_unregister_client, so 653 * we add an arbitrary delay. I'll have to fix that in the core 654 */ 655 msleep(1000); 656 657 /* Release all sensors */ 658 /* One more crappy race: I don't think we have any guarantee here 659 * that the attribute callback won't race with the sensor beeing 660 * disposed of, and I'm not 100% certain what best way to deal 661 * with that except by adding locks all over... I'll do that 662 * eventually but heh, who ever rmmod this module anyway ? 663 */ 664 if (sensor_cpu_power) 665 wf_put_sensor(sensor_cpu_power); 666 if (sensor_cpu_temp) 667 wf_put_sensor(sensor_cpu_temp); 668 if (sensor_hd_temp) 669 wf_put_sensor(sensor_hd_temp); 670 if (sensor_slots_power) 671 wf_put_sensor(sensor_slots_power); 672 673 /* Release all controls */ 674 if (fan_cpu_main) 675 wf_put_control(fan_cpu_main); 676 if (fan_cpu_second) 677 wf_put_control(fan_cpu_second); 678 if (fan_cpu_third) 679 wf_put_control(fan_cpu_third); 680 if (fan_hd) 681 wf_put_control(fan_hd); 682 if (fan_slots) 683 wf_put_control(fan_slots); 684 if (cpufreq_clamp) 685 wf_put_control(cpufreq_clamp); 686 687 /* Destroy control loops state structures */ 688 kfree(wf_smu_slots_fans); 689 kfree(wf_smu_drive_fans); 690 kfree(wf_smu_cpu_fans); 691 } 692 693 static struct platform_driver wf_smu_driver = { 694 .probe = wf_smu_probe, 695 .remove = wf_smu_remove, 696 .driver = { 697 .name = "windfarm", 698 }, 699 }; 700 701 702 static int __init wf_smu_init(void) 703 { 704 int rc = -ENODEV; 705 706 if (of_machine_is_compatible("PowerMac9,1")) 707 rc = wf_init_pm(); 708 709 if (rc == 0) { 710 #ifdef MODULE 711 request_module("windfarm_smu_controls"); 712 request_module("windfarm_smu_sensors"); 713 request_module("windfarm_lm75_sensor"); 714 request_module("windfarm_cpufreq_clamp"); 715 716 #endif /* MODULE */ 717 platform_driver_register(&wf_smu_driver); 718 } 719 720 return rc; 721 } 722 723 static void __exit wf_smu_exit(void) 724 { 725 726 platform_driver_unregister(&wf_smu_driver); 727 } 728 729 730 module_init(wf_smu_init); 731 module_exit(wf_smu_exit); 732 733 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); 734 MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); 735 MODULE_LICENSE("GPL"); 736 737 MODULE_ALIAS("platform:windfarm"); 738