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/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, wf_smu_started; 79 80 /* Failure handling.. could be nicer */ 81 #define FAILURE_FAN 0x01 82 #define FAILURE_SENSOR 0x02 83 #define FAILURE_OVERTEMP 0x04 84 85 static unsigned int wf_smu_failure_state; 86 static int wf_smu_readjust, wf_smu_skipping; 87 88 /* 89 * ****** CPU Fans Control Loop ****** 90 * 91 */ 92 93 94 #define WF_SMU_CPU_FANS_INTERVAL 1 95 #define WF_SMU_CPU_FANS_MAX_HISTORY 16 96 97 /* State data used by the cpu fans control loop 98 */ 99 struct wf_smu_cpu_fans_state { 100 int ticks; 101 s32 cpu_setpoint; 102 struct wf_cpu_pid_state pid; 103 }; 104 105 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; 106 107 108 109 /* 110 * ****** Drive Fan Control Loop ****** 111 * 112 */ 113 114 struct wf_smu_drive_fans_state { 115 int ticks; 116 s32 setpoint; 117 struct wf_pid_state pid; 118 }; 119 120 static struct wf_smu_drive_fans_state *wf_smu_drive_fans; 121 122 /* 123 * ****** Slots Fan Control Loop ****** 124 * 125 */ 126 127 struct wf_smu_slots_fans_state { 128 int ticks; 129 s32 setpoint; 130 struct wf_pid_state pid; 131 }; 132 133 static struct wf_smu_slots_fans_state *wf_smu_slots_fans; 134 135 /* 136 * ***** Implementation ***** 137 * 138 */ 139 140 141 static void wf_smu_create_cpu_fans(void) 142 { 143 struct wf_cpu_pid_param pid_param; 144 const struct smu_sdbp_header *hdr; 145 struct smu_sdbp_cpupiddata *piddata; 146 struct smu_sdbp_fvt *fvt; 147 s32 tmax, tdelta, maxpow, powadj; 148 149 /* First, locate the PID params in SMU SBD */ 150 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); 151 if (hdr == 0) { 152 printk(KERN_WARNING "windfarm: CPU PID fan config not found " 153 "max fan speed\n"); 154 goto fail; 155 } 156 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; 157 158 /* Get the FVT params for operating point 0 (the only supported one 159 * for now) in order to get tmax 160 */ 161 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); 162 if (hdr) { 163 fvt = (struct smu_sdbp_fvt *)&hdr[1]; 164 tmax = ((s32)fvt->maxtemp) << 16; 165 } else 166 tmax = 0x5e0000; /* 94 degree default */ 167 168 /* Alloc & initialize state */ 169 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), 170 GFP_KERNEL); 171 if (wf_smu_cpu_fans == NULL) 172 goto fail; 173 wf_smu_cpu_fans->ticks = 1; 174 175 /* Fill PID params */ 176 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; 177 pid_param.history_len = piddata->history_len; 178 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { 179 printk(KERN_WARNING "windfarm: History size overflow on " 180 "CPU control loop (%d)\n", piddata->history_len); 181 pid_param.history_len = WF_CPU_PID_MAX_HISTORY; 182 } 183 pid_param.gd = piddata->gd; 184 pid_param.gp = piddata->gp; 185 pid_param.gr = piddata->gr / pid_param.history_len; 186 187 tdelta = ((s32)piddata->target_temp_delta) << 16; 188 maxpow = ((s32)piddata->max_power) << 16; 189 powadj = ((s32)piddata->power_adj) << 16; 190 191 pid_param.tmax = tmax; 192 pid_param.ttarget = tmax - tdelta; 193 pid_param.pmaxadj = maxpow - powadj; 194 195 pid_param.min = wf_control_get_min(fan_cpu_main); 196 pid_param.max = wf_control_get_max(fan_cpu_main); 197 198 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); 199 200 DBG("wf: CPU Fan control initialized.\n"); 201 DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", 202 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), 203 pid_param.min, pid_param.max); 204 205 return; 206 207 fail: 208 printk(KERN_WARNING "windfarm: CPU fan config not found\n" 209 "for this machine model, max fan speed\n"); 210 211 if (cpufreq_clamp) 212 wf_control_set_max(cpufreq_clamp); 213 if (fan_cpu_main) 214 wf_control_set_max(fan_cpu_main); 215 } 216 217 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) 218 { 219 s32 new_setpoint, temp, power; 220 int rc; 221 222 if (--st->ticks != 0) { 223 if (wf_smu_readjust) 224 goto readjust; 225 return; 226 } 227 st->ticks = WF_SMU_CPU_FANS_INTERVAL; 228 229 rc = wf_sensor_get(sensor_cpu_temp, &temp); 230 if (rc) { 231 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", 232 rc); 233 wf_smu_failure_state |= FAILURE_SENSOR; 234 return; 235 } 236 237 rc = wf_sensor_get(sensor_cpu_power, &power); 238 if (rc) { 239 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", 240 rc); 241 wf_smu_failure_state |= FAILURE_SENSOR; 242 return; 243 } 244 245 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", 246 FIX32TOPRINT(temp), FIX32TOPRINT(power)); 247 248 #ifdef HACKED_OVERTEMP 249 if (temp > 0x4a0000) 250 wf_smu_failure_state |= FAILURE_OVERTEMP; 251 #else 252 if (temp > st->pid.param.tmax) 253 wf_smu_failure_state |= FAILURE_OVERTEMP; 254 #endif 255 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); 256 257 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); 258 259 if (st->cpu_setpoint == new_setpoint) 260 return; 261 st->cpu_setpoint = new_setpoint; 262 readjust: 263 if (fan_cpu_main && wf_smu_failure_state == 0) { 264 rc = wf_control_set(fan_cpu_main, st->cpu_setpoint); 265 if (rc) { 266 printk(KERN_WARNING "windfarm: CPU main fan" 267 " error %d\n", rc); 268 wf_smu_failure_state |= FAILURE_FAN; 269 } 270 } 271 if (fan_cpu_second && wf_smu_failure_state == 0) { 272 rc = wf_control_set(fan_cpu_second, st->cpu_setpoint); 273 if (rc) { 274 printk(KERN_WARNING "windfarm: CPU second fan" 275 " error %d\n", rc); 276 wf_smu_failure_state |= FAILURE_FAN; 277 } 278 } 279 if (fan_cpu_third && wf_smu_failure_state == 0) { 280 rc = wf_control_set(fan_cpu_third, st->cpu_setpoint); 281 if (rc) { 282 printk(KERN_WARNING "windfarm: CPU third fan" 283 " error %d\n", rc); 284 wf_smu_failure_state |= FAILURE_FAN; 285 } 286 } 287 } 288 289 static void wf_smu_create_drive_fans(void) 290 { 291 struct wf_pid_param param = { 292 .interval = 5, 293 .history_len = 2, 294 .gd = 0x01e00000, 295 .gp = 0x00500000, 296 .gr = 0x00000000, 297 .itarget = 0x00200000, 298 }; 299 300 /* Alloc & initialize state */ 301 wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state), 302 GFP_KERNEL); 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(sizeof(struct wf_smu_slots_fans_state), 383 GFP_KERNEL); 384 if (wf_smu_slots_fans == NULL) { 385 printk(KERN_WARNING "windfarm: Memory allocation error" 386 " max fan speed\n"); 387 goto fail; 388 } 389 wf_smu_slots_fans->ticks = 1; 390 391 /* Fill PID params */ 392 param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN); 393 param.min = wf_control_get_min(fan_slots); 394 param.max = wf_control_get_max(fan_slots); 395 wf_pid_init(&wf_smu_slots_fans->pid, ¶m); 396 397 DBG("wf: Slots Fan control initialized.\n"); 398 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 399 FIX32TOPRINT(param.itarget), param.min, param.max); 400 return; 401 402 fail: 403 if (fan_slots) 404 wf_control_set_max(fan_slots); 405 } 406 407 static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st) 408 { 409 s32 new_setpoint, power; 410 int rc; 411 412 if (--st->ticks != 0) { 413 if (wf_smu_readjust) 414 goto readjust; 415 return; 416 } 417 st->ticks = st->pid.param.interval; 418 419 rc = wf_sensor_get(sensor_slots_power, &power); 420 if (rc) { 421 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n", 422 rc); 423 wf_smu_failure_state |= FAILURE_SENSOR; 424 return; 425 } 426 427 DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n", 428 FIX32TOPRINT(power)); 429 430 #if 0 /* Check what makes a good overtemp condition */ 431 if (power > (st->pid.param.itarget + 0x50000)) 432 wf_smu_failure_state |= FAILURE_OVERTEMP; 433 #endif 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 = wf_control_set(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 */ 458 459 static 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 } 531 532 533 static 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 } 572 573 static 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 } 602 603 604 static 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 } 626 627 static struct notifier_block wf_smu_events = { 628 .notifier_call = wf_smu_notify, 629 }; 630 631 static int wf_init_pm(void) 632 { 633 printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n"); 634 635 return 0; 636 } 637 638 static int wf_smu_probe(struct platform_device *ddev) 639 { 640 wf_register_client(&wf_smu_events); 641 642 return 0; 643 } 644 645 static int wf_smu_remove(struct platform_device *ddev) 646 { 647 wf_unregister_client(&wf_smu_events); 648 649 /* XXX We don't have yet a guarantee that our callback isn't 650 * in progress when returning from wf_unregister_client, so 651 * we add an arbitrary delay. I'll have to fix that in the core 652 */ 653 msleep(1000); 654 655 /* Release all sensors */ 656 /* One more crappy race: I don't think we have any guarantee here 657 * that the attribute callback won't race with the sensor beeing 658 * disposed of, and I'm not 100% certain what best way to deal 659 * with that except by adding locks all over... I'll do that 660 * eventually but heh, who ever rmmod this module anyway ? 661 */ 662 if (sensor_cpu_power) 663 wf_put_sensor(sensor_cpu_power); 664 if (sensor_cpu_temp) 665 wf_put_sensor(sensor_cpu_temp); 666 if (sensor_hd_temp) 667 wf_put_sensor(sensor_hd_temp); 668 if (sensor_slots_power) 669 wf_put_sensor(sensor_slots_power); 670 671 /* Release all controls */ 672 if (fan_cpu_main) 673 wf_put_control(fan_cpu_main); 674 if (fan_cpu_second) 675 wf_put_control(fan_cpu_second); 676 if (fan_cpu_third) 677 wf_put_control(fan_cpu_third); 678 if (fan_hd) 679 wf_put_control(fan_hd); 680 if (fan_slots) 681 wf_put_control(fan_slots); 682 if (cpufreq_clamp) 683 wf_put_control(cpufreq_clamp); 684 685 /* Destroy control loops state structures */ 686 kfree(wf_smu_slots_fans); 687 kfree(wf_smu_drive_fans); 688 kfree(wf_smu_cpu_fans); 689 690 return 0; 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 .owner = THIS_MODULE, 699 }, 700 }; 701 702 703 static int __init wf_smu_init(void) 704 { 705 int rc = -ENODEV; 706 707 if (of_machine_is_compatible("PowerMac9,1")) 708 rc = wf_init_pm(); 709 710 if (rc == 0) { 711 #ifdef MODULE 712 request_module("windfarm_smu_controls"); 713 request_module("windfarm_smu_sensors"); 714 request_module("windfarm_lm75_sensor"); 715 request_module("windfarm_cpufreq_clamp"); 716 717 #endif /* MODULE */ 718 platform_driver_register(&wf_smu_driver); 719 } 720 721 return rc; 722 } 723 724 static void __exit wf_smu_exit(void) 725 { 726 727 platform_driver_unregister(&wf_smu_driver); 728 } 729 730 731 module_init(wf_smu_init); 732 module_exit(wf_smu_exit); 733 734 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); 735 MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1"); 736 MODULE_LICENSE("GPL"); 737 738 MODULE_ALIAS("platform:windfarm"); 739