1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Windfarm PowerMac thermal control. iMac G5 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 * PowerMac8,1 and PowerMac8,2 16 * =========================== 17 * 18 * System Fans control loop. Different based on models. In addition to the 19 * usual PID algorithm, the control loop gets 2 additional pairs of linear 20 * scaling factors (scale/offsets) expressed as 4.12 fixed point values 21 * signed offset, unsigned scale) 22 * 23 * The targets are modified such as: 24 * - the linked control (second control) gets the target value as-is 25 * (typically the drive fan) 26 * - the main control (first control) gets the target value scaled with 27 * the first pair of factors, and is then modified as below 28 * - the value of the target of the CPU Fan control loop is retrieved, 29 * scaled with the second pair of factors, and the max of that and 30 * the scaled target is applied to the main control. 31 * 32 * # model_id: 2 33 * controls : system-fan, drive-bay-fan 34 * sensors : hd-temp 35 * PID params : G_d = 0x15400000 36 * G_p = 0x00200000 37 * G_r = 0x000002fd 38 * History = 2 entries 39 * Input target = 0x3a0000 40 * Interval = 5s 41 * linear-factors : offset = 0xff38 scale = 0x0ccd 42 * offset = 0x0208 scale = 0x07ae 43 * 44 * # model_id: 3 45 * controls : system-fan, drive-bay-fan 46 * sensors : hd-temp 47 * PID params : G_d = 0x08e00000 48 * G_p = 0x00566666 49 * G_r = 0x0000072b 50 * History = 2 entries 51 * Input target = 0x350000 52 * Interval = 5s 53 * linear-factors : offset = 0xff38 scale = 0x0ccd 54 * offset = 0x0000 scale = 0x0000 55 * 56 * # model_id: 5 57 * controls : system-fan 58 * sensors : hd-temp 59 * PID params : G_d = 0x15400000 60 * G_p = 0x00233333 61 * G_r = 0x000002fd 62 * History = 2 entries 63 * Input target = 0x3a0000 64 * Interval = 5s 65 * linear-factors : offset = 0x0000 scale = 0x1000 66 * offset = 0x0091 scale = 0x0bae 67 * 68 * CPU Fan control loop. The loop is identical for all models. it 69 * has an additional pair of scaling factor. This is used to scale the 70 * systems fan control loop target result (the one before it gets scaled 71 * by the System Fans control loop itself). Then, the max value of the 72 * calculated target value and system fan value is sent to the fans 73 * 74 * controls : cpu-fan 75 * sensors : cpu-temp cpu-power 76 * PID params : From SMU sdb partition 77 * linear-factors : offset = 0xfb50 scale = 0x1000 78 * 79 * CPU Slew control loop. Not implemented. The cpufreq driver in linux is 80 * completely separate for now, though we could find a way to link it, either 81 * as a client reacting to overtemp notifications, or directling monitoring 82 * the CPU temperature 83 * 84 * WARNING ! The CPU control loop requires the CPU tmax for the current 85 * operating point. However, we currently are completely separated from 86 * the cpufreq driver and thus do not know what the current operating 87 * point is. Fortunately, we also do not have any hardware supporting anything 88 * but operating point 0 at the moment, thus we just peek that value directly 89 * from the SDB partition. If we ever end up with actually slewing the system 90 * clock and thus changing operating points, we'll have to find a way to 91 * communicate with the CPU freq driver; 92 */ 93 94 #include <linux/types.h> 95 #include <linux/errno.h> 96 #include <linux/kernel.h> 97 #include <linux/delay.h> 98 #include <linux/slab.h> 99 #include <linux/init.h> 100 #include <linux/spinlock.h> 101 #include <linux/wait.h> 102 #include <linux/kmod.h> 103 #include <linux/device.h> 104 #include <linux/platform_device.h> 105 #include <linux/of.h> 106 107 #include <asm/machdep.h> 108 #include <asm/io.h> 109 #include <asm/sections.h> 110 #include <asm/smu.h> 111 112 #include "windfarm.h" 113 #include "windfarm_pid.h" 114 115 #define VERSION "0.4" 116 117 #undef DEBUG 118 119 #ifdef DEBUG 120 #define DBG(args...) printk(args) 121 #else 122 #define DBG(args...) do { } while(0) 123 #endif 124 125 /* define this to force CPU overtemp to 74 degree, useful for testing 126 * the overtemp code 127 */ 128 #undef HACKED_OVERTEMP 129 130 static int wf_smu_mach_model; /* machine model id */ 131 132 /* Controls & sensors */ 133 static struct wf_sensor *sensor_cpu_power; 134 static struct wf_sensor *sensor_cpu_temp; 135 static struct wf_sensor *sensor_hd_temp; 136 static struct wf_control *fan_cpu_main; 137 static struct wf_control *fan_hd; 138 static struct wf_control *fan_system; 139 static struct wf_control *cpufreq_clamp; 140 141 /* Set to kick the control loop into life */ 142 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok; 143 static bool 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 static bool wf_smu_overtemp; 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_obj(struct wf_smu_sys_fans_state); 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) { 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_obj(struct wf_smu_cpu_fans_state); 422 if (wf_smu_cpu_fans == NULL) 423 goto fail; 424 wf_smu_cpu_fans->ticks = 1; 425 426 wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE; 427 wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET; 428 429 /* Fill PID params */ 430 pid_param.interval = WF_SMU_CPU_FANS_INTERVAL; 431 pid_param.history_len = piddata->history_len; 432 if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) { 433 printk(KERN_WARNING "windfarm: History size overflow on " 434 "CPU control loop (%d)\n", piddata->history_len); 435 pid_param.history_len = WF_CPU_PID_MAX_HISTORY; 436 } 437 pid_param.gd = piddata->gd; 438 pid_param.gp = piddata->gp; 439 pid_param.gr = piddata->gr / pid_param.history_len; 440 441 tdelta = ((s32)piddata->target_temp_delta) << 16; 442 maxpow = ((s32)piddata->max_power) << 16; 443 powadj = ((s32)piddata->power_adj) << 16; 444 445 pid_param.tmax = tmax; 446 pid_param.ttarget = tmax - tdelta; 447 pid_param.pmaxadj = maxpow - powadj; 448 449 pid_param.min = wf_control_get_min(fan_cpu_main); 450 pid_param.max = wf_control_get_max(fan_cpu_main); 451 452 wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param); 453 454 DBG("wf: CPU Fan control initialized.\n"); 455 DBG(" ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n", 456 FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax), 457 pid_param.min, pid_param.max); 458 459 return; 460 461 fail: 462 printk(KERN_WARNING "windfarm: CPU fan config not found\n" 463 "for this machine model, max fan speed\n"); 464 465 if (cpufreq_clamp) 466 wf_control_set_max(cpufreq_clamp); 467 if (fan_cpu_main) 468 wf_control_set_max(fan_cpu_main); 469 } 470 471 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st) 472 { 473 s32 new_setpoint, temp, power, systarget; 474 int rc; 475 476 if (--st->ticks != 0) { 477 if (wf_smu_readjust) 478 goto readjust; 479 return; 480 } 481 st->ticks = WF_SMU_CPU_FANS_INTERVAL; 482 483 rc = wf_sensor_get(sensor_cpu_temp, &temp); 484 if (rc) { 485 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n", 486 rc); 487 wf_smu_failure_state |= FAILURE_SENSOR; 488 return; 489 } 490 491 rc = wf_sensor_get(sensor_cpu_power, &power); 492 if (rc) { 493 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n", 494 rc); 495 wf_smu_failure_state |= FAILURE_SENSOR; 496 return; 497 } 498 499 DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n", 500 FIX32TOPRINT(temp), FIX32TOPRINT(power)); 501 502 #ifdef HACKED_OVERTEMP 503 if (temp > 0x4a0000) 504 wf_smu_failure_state |= FAILURE_OVERTEMP; 505 #else 506 if (temp > st->pid.param.tmax) 507 wf_smu_failure_state |= FAILURE_OVERTEMP; 508 #endif 509 new_setpoint = wf_cpu_pid_run(&st->pid, power, temp); 510 511 DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint); 512 513 systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0; 514 systarget = ((((s64)systarget) * (s64)st->scale) >> 12) 515 + st->offset; 516 new_setpoint = max(new_setpoint, systarget); 517 new_setpoint = max(new_setpoint, st->pid.param.min); 518 new_setpoint = min(new_setpoint, st->pid.param.max); 519 520 DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint); 521 522 if (st->cpu_setpoint == new_setpoint) 523 return; 524 st->cpu_setpoint = new_setpoint; 525 readjust: 526 if (fan_cpu_main && wf_smu_failure_state == 0) { 527 rc = wf_control_set(fan_cpu_main, st->cpu_setpoint); 528 if (rc) { 529 printk(KERN_WARNING "windfarm: CPU main fan" 530 " error %d\n", rc); 531 wf_smu_failure_state |= FAILURE_FAN; 532 } 533 } 534 } 535 536 /* 537 * ****** Setup / Init / Misc ... ****** 538 * 539 */ 540 541 static void wf_smu_tick(void) 542 { 543 unsigned int last_failure = wf_smu_failure_state; 544 unsigned int new_failure; 545 546 if (!wf_smu_started) { 547 DBG("wf: creating control loops !\n"); 548 wf_smu_create_sys_fans(); 549 wf_smu_create_cpu_fans(); 550 wf_smu_started = true; 551 } 552 553 /* Skipping ticks */ 554 if (wf_smu_skipping && --wf_smu_skipping) 555 return; 556 557 wf_smu_failure_state = 0; 558 if (wf_smu_sys_fans) 559 wf_smu_sys_fans_tick(wf_smu_sys_fans); 560 if (wf_smu_cpu_fans) 561 wf_smu_cpu_fans_tick(wf_smu_cpu_fans); 562 563 wf_smu_readjust = 0; 564 new_failure = wf_smu_failure_state & ~last_failure; 565 566 /* If entering failure mode, clamp cpufreq and ramp all 567 * fans to full speed. 568 */ 569 if (wf_smu_failure_state && !last_failure) { 570 if (cpufreq_clamp) 571 wf_control_set_max(cpufreq_clamp); 572 if (fan_system) 573 wf_control_set_max(fan_system); 574 if (fan_cpu_main) 575 wf_control_set_max(fan_cpu_main); 576 if (fan_hd) 577 wf_control_set_max(fan_hd); 578 } 579 580 /* If leaving failure mode, unclamp cpufreq and readjust 581 * all fans on next iteration 582 */ 583 if (!wf_smu_failure_state && last_failure) { 584 if (cpufreq_clamp) 585 wf_control_set_min(cpufreq_clamp); 586 wf_smu_readjust = 1; 587 } 588 589 /* Overtemp condition detected, notify and start skipping a couple 590 * ticks to let the temperature go down 591 */ 592 if (new_failure & FAILURE_OVERTEMP) { 593 wf_set_overtemp(); 594 wf_smu_skipping = 2; 595 wf_smu_overtemp = true; 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 (!wf_smu_failure_state && wf_smu_overtemp) { 605 wf_clear_overtemp(); 606 wf_smu_overtemp = false; 607 } 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) { 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 void 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 } 763 764 static struct platform_driver wf_smu_driver = { 765 .probe = wf_smu_probe, 766 .remove = wf_smu_remove, 767 .driver = { 768 .name = "windfarm", 769 }, 770 }; 771 772 773 static int __init wf_smu_init(void) 774 { 775 int rc = -ENODEV; 776 777 if (of_machine_is_compatible("PowerMac8,1") || 778 of_machine_is_compatible("PowerMac8,2")) 779 rc = wf_init_pm(); 780 781 if (rc == 0) { 782 #ifdef MODULE 783 request_module("windfarm_smu_controls"); 784 request_module("windfarm_smu_sensors"); 785 request_module("windfarm_lm75_sensor"); 786 request_module("windfarm_cpufreq_clamp"); 787 788 #endif /* MODULE */ 789 platform_driver_register(&wf_smu_driver); 790 } 791 792 return rc; 793 } 794 795 static void __exit wf_smu_exit(void) 796 { 797 798 platform_driver_unregister(&wf_smu_driver); 799 } 800 801 802 module_init(wf_smu_init); 803 module_exit(wf_smu_exit); 804 805 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>"); 806 MODULE_DESCRIPTION("Thermal control logic for iMac G5"); 807 MODULE_LICENSE("GPL"); 808 MODULE_ALIAS("platform:windfarm"); 809