1 /* 2 * Windfarm PowerMac thermal control. iMac G5 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 * PowerMac8,1 and PowerMac8,2 17 * =========================== 18 * 19 * System Fans control loop. Different based on models. In addition to the 20 * usual PID algorithm, the control loop gets 2 additional pairs of linear 21 * scaling factors (scale/offsets) expressed as 4.12 fixed point values 22 * signed offset, unsigned scale) 23 * 24 * The targets are modified such as: 25 * - the linked control (second control) gets the target value as-is 26 * (typically the drive fan) 27 * - the main control (first control) gets the target value scaled with 28 * the first pair of factors, and is then modified as below 29 * - the value of the target of the CPU Fan control loop is retrieved, 30 * scaled with the second pair of factors, and the max of that and 31 * the scaled target is applied to the main control. 32 * 33 * # model_id: 2 34 * controls : system-fan, drive-bay-fan 35 * sensors : hd-temp 36 * PID params : G_d = 0x15400000 37 * G_p = 0x00200000 38 * G_r = 0x000002fd 39 * History = 2 entries 40 * Input target = 0x3a0000 41 * Interval = 5s 42 * linear-factors : offset = 0xff38 scale = 0x0ccd 43 * offset = 0x0208 scale = 0x07ae 44 * 45 * # model_id: 3 46 * controls : system-fan, drive-bay-fan 47 * sensors : hd-temp 48 * PID params : G_d = 0x08e00000 49 * G_p = 0x00566666 50 * G_r = 0x0000072b 51 * History = 2 entries 52 * Input target = 0x350000 53 * Interval = 5s 54 * linear-factors : offset = 0xff38 scale = 0x0ccd 55 * offset = 0x0000 scale = 0x0000 56 * 57 * # model_id: 5 58 * controls : system-fan 59 * sensors : hd-temp 60 * PID params : G_d = 0x15400000 61 * G_p = 0x00233333 62 * G_r = 0x000002fd 63 * History = 2 entries 64 * Input target = 0x3a0000 65 * Interval = 5s 66 * linear-factors : offset = 0x0000 scale = 0x1000 67 * offset = 0x0091 scale = 0x0bae 68 * 69 * CPU Fan control loop. The loop is identical for all models. it 70 * has an additional pair of scaling factor. This is used to scale the 71 * systems fan control loop target result (the one before it gets scaled 72 * by the System Fans control loop itself). Then, the max value of the 73 * calculated target value and system fan value is sent to the fans 74 * 75 * controls : cpu-fan 76 * sensors : cpu-temp cpu-power 77 * PID params : From SMU sdb partition 78 * linear-factors : offset = 0xfb50 scale = 0x1000 79 * 80 * CPU Slew control loop. Not implemented. The cpufreq driver in linux is 81 * completely separate for now, though we could find a way to link it, either 82 * as a client reacting to overtemp notifications, or directling monitoring 83 * the CPU temperature 84 * 85 * WARNING ! The CPU control loop requires the CPU tmax for the current 86 * operating point. However, we currently are completely separated from 87 * the cpufreq driver and thus do not know what the current operating 88 * point is. Fortunately, we also do not have any hardware supporting anything 89 * but operating point 0 at the moment, thus we just peek that value directly 90 * from the SDB partition. If we ever end up with actually slewing the system 91 * clock and thus changing operating points, we'll have to find a way to 92 * communicate with the CPU freq driver; 93 * 94 */ 95 96 #include <linux/types.h> 97 #include <linux/errno.h> 98 #include <linux/kernel.h> 99 #include <linux/delay.h> 100 #include <linux/slab.h> 101 #include <linux/init.h> 102 #include <linux/spinlock.h> 103 #include <linux/wait.h> 104 #include <linux/kmod.h> 105 #include <linux/device.h> 106 #include <linux/platform_device.h> 107 #include <asm/prom.h> 108 #include <asm/machdep.h> 109 #include <asm/io.h> 110 #include <asm/system.h> 111 #include <asm/sections.h> 112 #include <asm/smu.h> 113 114 #include "windfarm.h" 115 #include "windfarm_pid.h" 116 117 #define VERSION "0.4" 118 119 #undef DEBUG 120 121 #ifdef DEBUG 122 #define DBG(args...) printk(args) 123 #else 124 #define DBG(args...) do { } while(0) 125 #endif 126 127 /* define this to force CPU overtemp to 74 degree, useful for testing 128 * the overtemp code 129 */ 130 #undef HACKED_OVERTEMP 131 132 static int wf_smu_mach_model; /* machine model id */ 133 134 /* Controls & sensors */ 135 static struct wf_sensor *sensor_cpu_power; 136 static struct wf_sensor *sensor_cpu_temp; 137 static struct wf_sensor *sensor_hd_temp; 138 static struct wf_control *fan_cpu_main; 139 static struct wf_control *fan_hd; 140 static struct wf_control *fan_system; 141 static struct wf_control *cpufreq_clamp; 142 143 /* Set to kick the control loop into life */ 144 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started; 145 146 /* Failure handling.. could be nicer */ 147 #define FAILURE_FAN 0x01 148 #define FAILURE_SENSOR 0x02 149 #define FAILURE_OVERTEMP 0x04 150 151 static unsigned int wf_smu_failure_state; 152 static int wf_smu_readjust, wf_smu_skipping; 153 154 /* 155 * ****** System Fans Control Loop ****** 156 * 157 */ 158 159 /* Parameters for the System Fans control loop. Parameters 160 * not in this table such as interval, history size, ... 161 * are common to all versions and thus hard coded for now. 162 */ 163 struct wf_smu_sys_fans_param { 164 int model_id; 165 s32 itarget; 166 s32 gd, gp, gr; 167 168 s16 offset0; 169 u16 scale0; 170 s16 offset1; 171 u16 scale1; 172 }; 173 174 #define WF_SMU_SYS_FANS_INTERVAL 5 175 #define WF_SMU_SYS_FANS_HISTORY_SIZE 2 176 177 /* State data used by the system fans control loop 178 */ 179 struct wf_smu_sys_fans_state { 180 int ticks; 181 s32 sys_setpoint; 182 s32 hd_setpoint; 183 s16 offset0; 184 u16 scale0; 185 s16 offset1; 186 u16 scale1; 187 struct wf_pid_state pid; 188 }; 189 190 /* 191 * Configs for SMU System Fan control loop 192 */ 193 static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = { 194 /* Model ID 2 */ 195 { 196 .model_id = 2, 197 .itarget = 0x3a0000, 198 .gd = 0x15400000, 199 .gp = 0x00200000, 200 .gr = 0x000002fd, 201 .offset0 = 0xff38, 202 .scale0 = 0x0ccd, 203 .offset1 = 0x0208, 204 .scale1 = 0x07ae, 205 }, 206 /* Model ID 3 */ 207 { 208 .model_id = 3, 209 .itarget = 0x350000, 210 .gd = 0x08e00000, 211 .gp = 0x00566666, 212 .gr = 0x0000072b, 213 .offset0 = 0xff38, 214 .scale0 = 0x0ccd, 215 .offset1 = 0x0000, 216 .scale1 = 0x0000, 217 }, 218 /* Model ID 5 */ 219 { 220 .model_id = 5, 221 .itarget = 0x3a0000, 222 .gd = 0x15400000, 223 .gp = 0x00233333, 224 .gr = 0x000002fd, 225 .offset0 = 0x0000, 226 .scale0 = 0x1000, 227 .offset1 = 0x0091, 228 .scale1 = 0x0bae, 229 }, 230 }; 231 #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params) 232 233 static struct wf_smu_sys_fans_state *wf_smu_sys_fans; 234 235 /* 236 * ****** CPU Fans Control Loop ****** 237 * 238 */ 239 240 241 #define WF_SMU_CPU_FANS_INTERVAL 1 242 #define WF_SMU_CPU_FANS_MAX_HISTORY 16 243 #define WF_SMU_CPU_FANS_SIBLING_SCALE 0x00001000 244 #define WF_SMU_CPU_FANS_SIBLING_OFFSET 0xfffffb50 245 246 /* State data used by the cpu fans control loop 247 */ 248 struct wf_smu_cpu_fans_state { 249 int ticks; 250 s32 cpu_setpoint; 251 s32 scale; 252 s32 offset; 253 struct wf_cpu_pid_state pid; 254 }; 255 256 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans; 257 258 259 260 /* 261 * ***** Implementation ***** 262 * 263 */ 264 265 static void wf_smu_create_sys_fans(void) 266 { 267 struct wf_smu_sys_fans_param *param = NULL; 268 struct wf_pid_param pid_param; 269 int i; 270 271 /* First, locate the params for this model */ 272 for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++) 273 if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) { 274 param = &wf_smu_sys_all_params[i]; 275 break; 276 } 277 278 /* No params found, put fans to max */ 279 if (param == NULL) { 280 printk(KERN_WARNING "windfarm: System fan config not found " 281 "for this machine model, max fan speed\n"); 282 goto fail; 283 } 284 285 /* Alloc & initialize state */ 286 wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state), 287 GFP_KERNEL); 288 if (wf_smu_sys_fans == NULL) { 289 printk(KERN_WARNING "windfarm: Memory allocation error" 290 " max fan speed\n"); 291 goto fail; 292 } 293 wf_smu_sys_fans->ticks = 1; 294 wf_smu_sys_fans->scale0 = param->scale0; 295 wf_smu_sys_fans->offset0 = param->offset0; 296 wf_smu_sys_fans->scale1 = param->scale1; 297 wf_smu_sys_fans->offset1 = param->offset1; 298 299 /* Fill PID params */ 300 pid_param.gd = param->gd; 301 pid_param.gp = param->gp; 302 pid_param.gr = param->gr; 303 pid_param.interval = WF_SMU_SYS_FANS_INTERVAL; 304 pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE; 305 pid_param.itarget = param->itarget; 306 pid_param.min = fan_system->ops->get_min(fan_system); 307 pid_param.max = fan_system->ops->get_max(fan_system); 308 if (fan_hd) { 309 pid_param.min = 310 max(pid_param.min,fan_hd->ops->get_min(fan_hd)); 311 pid_param.max = 312 min(pid_param.max,fan_hd->ops->get_max(fan_hd)); 313 } 314 wf_pid_init(&wf_smu_sys_fans->pid, &pid_param); 315 316 DBG("wf: System Fan control initialized.\n"); 317 DBG(" itarged=%d.%03d, min=%d RPM, max=%d RPM\n", 318 FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max); 319 return; 320 321 fail: 322 323 if (fan_system) 324 wf_control_set_max(fan_system); 325 if (fan_hd) 326 wf_control_set_max(fan_hd); 327 } 328 329 static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st) 330 { 331 s32 new_setpoint, temp, scaled, cputarget; 332 int rc; 333 334 if (--st->ticks != 0) { 335 if (wf_smu_readjust) 336 goto readjust; 337 return; 338 } 339 st->ticks = WF_SMU_SYS_FANS_INTERVAL; 340 341 rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp); 342 if (rc) { 343 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n", 344 rc); 345 wf_smu_failure_state |= FAILURE_SENSOR; 346 return; 347 } 348 349 DBG("wf_smu: System Fans tick ! HD temp: %d.%03d\n", 350 FIX32TOPRINT(temp)); 351 352 if (temp > (st->pid.param.itarget + 0x50000)) 353 wf_smu_failure_state |= FAILURE_OVERTEMP; 354 355 new_setpoint = wf_pid_run(&st->pid, temp); 356 357 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); 358 359 scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0; 360 361 DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled); 362 363 cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0; 364 cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1; 365 scaled = max(scaled, cputarget); 366 scaled = max(scaled, st->pid.param.min); 367 scaled = min(scaled, st->pid.param.max); 368 369 DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled); 370 371 if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint) 372 return; 373 st->sys_setpoint = scaled; 374 st->hd_setpoint = new_setpoint; 375 readjust: 376 if (fan_system && wf_smu_failure_state == 0) { 377 rc = fan_system->ops->set_value(fan_system, st->sys_setpoint); 378 if (rc) { 379 printk(KERN_WARNING "windfarm: Sys fan error %d\n", 380 rc); 381 wf_smu_failure_state |= FAILURE_FAN; 382 } 383 } 384 if (fan_hd && wf_smu_failure_state == 0) { 385 rc = fan_hd->ops->set_value(fan_hd, st->hd_setpoint); 386 if (rc) { 387 printk(KERN_WARNING "windfarm: HD fan error %d\n", 388 rc); 389 wf_smu_failure_state |= FAILURE_FAN; 390 } 391 } 392 } 393 394 static void wf_smu_create_cpu_fans(void) 395 { 396 struct wf_cpu_pid_param pid_param; 397 const struct smu_sdbp_header *hdr; 398 struct smu_sdbp_cpupiddata *piddata; 399 struct smu_sdbp_fvt *fvt; 400 s32 tmax, tdelta, maxpow, powadj; 401 402 /* First, locate the PID params in SMU SBD */ 403 hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL); 404 if (hdr == 0) { 405 printk(KERN_WARNING "windfarm: CPU PID fan config not found " 406 "max fan speed\n"); 407 goto fail; 408 } 409 piddata = (struct smu_sdbp_cpupiddata *)&hdr[1]; 410 411 /* Get the FVT params for operating point 0 (the only supported one 412 * for now) in order to get tmax 413 */ 414 hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); 415 if (hdr) { 416 fvt = (struct smu_sdbp_fvt *)&hdr[1]; 417 tmax = ((s32)fvt->maxtemp) << 16; 418 } else 419 tmax = 0x5e0000; /* 94 degree default */ 420 421 /* Alloc & initialize state */ 422 wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state), 423 GFP_KERNEL); 424 if (wf_smu_cpu_fans == NULL) 425 goto fail; 426 wf_smu_cpu_fans->ticks = 1; 427 428 wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE; 429 wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET; 430 431 /* Fill PID params */ 432 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; 433 pid_param.history_len = piddata->history_len; 434 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { 435 printk(KERN_WARNING "windfarm: History size overflow on " 436 "CPU control loop (%d)\n", piddata->history_len); 437 pid_param.history_len = WF_CPU_PID_MAX_HISTORY; 438 } 439 pid_param.gd = piddata->gd; 440 pid_param.gp = piddata->gp; 441 pid_param.gr = piddata->gr / pid_param.history_len; 442 443 tdelta = ((s32)piddata->target_temp_delta) << 16; 444 maxpow = ((s32)piddata->max_power) << 16; 445 powadj = ((s32)piddata->power_adj) << 16; 446 447 pid_param.tmax = tmax; 448 pid_param.ttarget = tmax - tdelta; 449 pid_param.pmaxadj = maxpow - powadj; 450 451 pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main); 452 pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main); 453 454 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); 455 456 DBG("wf: CPU Fan control initialized.\n"); 457 DBG(" ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", 458 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), 459 pid_param.min, pid_param.max); 460 461 return; 462 463 fail: 464 printk(KERN_WARNING "windfarm: CPU fan config not found\n" 465 "for this machine model, max fan speed\n"); 466 467 if (cpufreq_clamp) 468 wf_control_set_max(cpufreq_clamp); 469 if (fan_cpu_main) 470 wf_control_set_max(fan_cpu_main); 471 } 472 473 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) 474 { 475 s32 new_setpoint, temp, power, systarget; 476 int rc; 477 478 if (--st->ticks != 0) { 479 if (wf_smu_readjust) 480 goto readjust; 481 return; 482 } 483 st->ticks = WF_SMU_CPU_FANS_INTERVAL; 484 485 rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp); 486 if (rc) { 487 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", 488 rc); 489 wf_smu_failure_state |= FAILURE_SENSOR; 490 return; 491 } 492 493 rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power); 494 if (rc) { 495 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", 496 rc); 497 wf_smu_failure_state |= FAILURE_SENSOR; 498 return; 499 } 500 501 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", 502 FIX32TOPRINT(temp), FIX32TOPRINT(power)); 503 504 #ifdef HACKED_OVERTEMP 505 if (temp > 0x4a0000) 506 wf_smu_failure_state |= FAILURE_OVERTEMP; 507 #else 508 if (temp > st->pid.param.tmax) 509 wf_smu_failure_state |= FAILURE_OVERTEMP; 510 #endif 511 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); 512 513 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); 514 515 systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0; 516 systarget = ((((s64)systarget) * (s64)st->scale) >> 12) 517 + st->offset; 518 new_setpoint = max(new_setpoint, systarget); 519 new_setpoint = max(new_setpoint, st->pid.param.min); 520 new_setpoint = min(new_setpoint, st->pid.param.max); 521 522 DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint); 523 524 if (st->cpu_setpoint == new_setpoint) 525 return; 526 st->cpu_setpoint = new_setpoint; 527 readjust: 528 if (fan_cpu_main && wf_smu_failure_state == 0) { 529 rc = fan_cpu_main->ops->set_value(fan_cpu_main, 530 st->cpu_setpoint); 531 if (rc) { 532 printk(KERN_WARNING "windfarm: CPU main fan" 533 " error %d\n", rc); 534 wf_smu_failure_state |= FAILURE_FAN; 535 } 536 } 537 } 538 539 /* 540 * ****** Setup / Init / Misc ... ****** 541 * 542 */ 543 544 static void wf_smu_tick(void) 545 { 546 unsigned int last_failure = wf_smu_failure_state; 547 unsigned int new_failure; 548 549 if (!wf_smu_started) { 550 DBG("wf: creating control loops !\n"); 551 wf_smu_create_sys_fans(); 552 wf_smu_create_cpu_fans(); 553 wf_smu_started = 1; 554 } 555 556 /* Skipping ticks */ 557 if (wf_smu_skipping && --wf_smu_skipping) 558 return; 559 560 wf_smu_failure_state = 0; 561 if (wf_smu_sys_fans) 562 wf_smu_sys_fans_tick(wf_smu_sys_fans); 563 if (wf_smu_cpu_fans) 564 wf_smu_cpu_fans_tick(wf_smu_cpu_fans); 565 566 wf_smu_readjust = 0; 567 new_failure = wf_smu_failure_state & ~last_failure; 568 569 /* If entering failure mode, clamp cpufreq and ramp all 570 * fans to full speed. 571 */ 572 if (wf_smu_failure_state && !last_failure) { 573 if (cpufreq_clamp) 574 wf_control_set_max(cpufreq_clamp); 575 if (fan_system) 576 wf_control_set_max(fan_system); 577 if (fan_cpu_main) 578 wf_control_set_max(fan_cpu_main); 579 if (fan_hd) 580 wf_control_set_max(fan_hd); 581 } 582 583 /* If leaving failure mode, unclamp cpufreq and readjust 584 * all fans on next iteration 585 */ 586 if (!wf_smu_failure_state && last_failure) { 587 if (cpufreq_clamp) 588 wf_control_set_min(cpufreq_clamp); 589 wf_smu_readjust = 1; 590 } 591 592 /* Overtemp condition detected, notify and start skipping a couple 593 * ticks to let the temperature go down 594 */ 595 if (new_failure & FAILURE_OVERTEMP) { 596 wf_set_overtemp(); 597 wf_smu_skipping = 2; 598 } 599 600 /* We only clear the overtemp condition if overtemp is cleared 601 * _and_ no other failure is present. Since a sensor error will 602 * clear the overtemp condition (can't measure temperature) at 603 * the control loop levels, but we don't want to keep it clear 604 * here in this case 605 */ 606 if (new_failure == 0 && last_failure & FAILURE_OVERTEMP) 607 wf_clear_overtemp(); 608 } 609 610 static void wf_smu_new_control(struct wf_control *ct) 611 { 612 if (wf_smu_all_controls_ok) 613 return; 614 615 if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) { 616 if (wf_get_control(ct) == 0) 617 fan_cpu_main = ct; 618 } 619 620 if (fan_system == NULL && !strcmp(ct->name, "system-fan")) { 621 if (wf_get_control(ct) == 0) 622 fan_system = ct; 623 } 624 625 if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) { 626 if (wf_get_control(ct) == 0) 627 cpufreq_clamp = ct; 628 } 629 630 /* Darwin property list says the HD fan is only for model ID 631 * 0, 1, 2 and 3 632 */ 633 634 if (wf_smu_mach_model > 3) { 635 if (fan_system && fan_cpu_main && cpufreq_clamp) 636 wf_smu_all_controls_ok = 1; 637 return; 638 } 639 640 if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) { 641 if (wf_get_control(ct) == 0) 642 fan_hd = ct; 643 } 644 645 if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp) 646 wf_smu_all_controls_ok = 1; 647 } 648 649 static void wf_smu_new_sensor(struct wf_sensor *sr) 650 { 651 if (wf_smu_all_sensors_ok) 652 return; 653 654 if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) { 655 if (wf_get_sensor(sr) == 0) 656 sensor_cpu_power = sr; 657 } 658 659 if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) { 660 if (wf_get_sensor(sr) == 0) 661 sensor_cpu_temp = sr; 662 } 663 664 if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) { 665 if (wf_get_sensor(sr) == 0) 666 sensor_hd_temp = sr; 667 } 668 669 if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp) 670 wf_smu_all_sensors_ok = 1; 671 } 672 673 674 static int wf_smu_notify(struct notifier_block *self, 675 unsigned long event, void *data) 676 { 677 switch(event) { 678 case WF_EVENT_NEW_CONTROL: 679 DBG("wf: new control %s detected\n", 680 ((struct wf_control *)data)->name); 681 wf_smu_new_control(data); 682 wf_smu_readjust = 1; 683 break; 684 case WF_EVENT_NEW_SENSOR: 685 DBG("wf: new sensor %s detected\n", 686 ((struct wf_sensor *)data)->name); 687 wf_smu_new_sensor(data); 688 break; 689 case WF_EVENT_TICK: 690 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok) 691 wf_smu_tick(); 692 } 693 694 return 0; 695 } 696 697 static struct notifier_block wf_smu_events = { 698 .notifier_call = wf_smu_notify, 699 }; 700 701 static int wf_init_pm(void) 702 { 703 const struct smu_sdbp_header *hdr; 704 705 hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL); 706 if (hdr != 0) { 707 struct smu_sdbp_sensortree *st = 708 (struct smu_sdbp_sensortree *)&hdr[1]; 709 wf_smu_mach_model = st->model_id; 710 } 711 712 printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n", 713 wf_smu_mach_model); 714 715 return 0; 716 } 717 718 static int wf_smu_probe(struct platform_device *ddev) 719 { 720 wf_register_client(&wf_smu_events); 721 722 return 0; 723 } 724 725 static int __devexit wf_smu_remove(struct platform_device *ddev) 726 { 727 wf_unregister_client(&wf_smu_events); 728 729 /* XXX We don't have yet a guarantee that our callback isn't 730 * in progress when returning from wf_unregister_client, so 731 * we add an arbitrary delay. I'll have to fix that in the core 732 */ 733 msleep(1000); 734 735 /* Release all sensors */ 736 /* One more crappy race: I don't think we have any guarantee here 737 * that the attribute callback won't race with the sensor beeing 738 * disposed of, and I'm not 100% certain what best way to deal 739 * with that except by adding locks all over... I'll do that 740 * eventually but heh, who ever rmmod this module anyway ? 741 */ 742 if (sensor_cpu_power) 743 wf_put_sensor(sensor_cpu_power); 744 if (sensor_cpu_temp) 745 wf_put_sensor(sensor_cpu_temp); 746 if (sensor_hd_temp) 747 wf_put_sensor(sensor_hd_temp); 748 749 /* Release all controls */ 750 if (fan_cpu_main) 751 wf_put_control(fan_cpu_main); 752 if (fan_hd) 753 wf_put_control(fan_hd); 754 if (fan_system) 755 wf_put_control(fan_system); 756 if (cpufreq_clamp) 757 wf_put_control(cpufreq_clamp); 758 759 /* Destroy control loops state structures */ 760 kfree(wf_smu_sys_fans); 761 kfree(wf_smu_cpu_fans); 762 763 return 0; 764 } 765 766 static struct platform_driver wf_smu_driver = { 767 .probe = wf_smu_probe, 768 .remove = __devexit_p(wf_smu_remove), 769 .driver = { 770 .name = "windfarm", 771 .owner = THIS_MODULE, 772 }, 773 }; 774 775 776 static int __init wf_smu_init(void) 777 { 778 int rc = -ENODEV; 779 780 if (of_machine_is_compatible("PowerMac8,1") || 781 of_machine_is_compatible("PowerMac8,2")) 782 rc = wf_init_pm(); 783 784 if (rc == 0) { 785 #ifdef MODULE 786 request_module("windfarm_smu_controls"); 787 request_module("windfarm_smu_sensors"); 788 request_module("windfarm_lm75_sensor"); 789 request_module("windfarm_cpufreq_clamp"); 790 791 #endif /* MODULE */ 792 platform_driver_register(&wf_smu_driver); 793 } 794 795 return rc; 796 } 797 798 static void __exit wf_smu_exit(void) 799 { 800 801 platform_driver_unregister(&wf_smu_driver); 802 } 803 804 805 module_init(wf_smu_init); 806 module_exit(wf_smu_exit); 807 808 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); 809 MODULE_DESCRIPTION("Thermal control logic for iMac G5"); 810 MODULE_LICENSE("GPL"); 811 MODULE_ALIAS("platform:windfarm"); 812