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