drivers/macintosh/windfarm_pm91.c

   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;
  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 == 0) {
 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(sizeof(struct wf_smu_cpu_fans_state),
 172                                   GFP_KERNEL);
 173         if (wf_smu_cpu_fans == NULL)
 174                 goto fail;
 175         wf_smu_cpu_fans->ticks = 1;
 176
 177         /* Fill PID params */
 178         pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
 179         pid_param.history_len = piddata->history_len;
 180         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 181                 printk(KERN_WARNING "windfarm: History size overflow on "
 182                        "CPU control loop (%d)\n", piddata->history_len);
 183                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 184         }
 185         pid_param.gd = piddata->gd;
 186         pid_param.gp = piddata->gp;
 187         pid_param.gr = piddata->gr / pid_param.history_len;
 188
 189         tdelta = ((s32)piddata->target_temp_delta) << 16;
 190         maxpow = ((s32)piddata->max_power) << 16;
 191         powadj = ((s32)piddata->power_adj) << 16;
 192
 193         pid_param.tmax = tmax;
 194         pid_param.ttarget = tmax - tdelta;
 195         pid_param.pmaxadj = maxpow - powadj;
 196
 197         pid_param.min = wf_control_get_min(fan_cpu_main);
 198         pid_param.max = wf_control_get_max(fan_cpu_main);
 199
 200         wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
 201
 202         DBG("wf: CPU Fan control initialized.\n");
 203         DBG("    ttarget=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
 204             FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 205             pid_param.min, pid_param.max);
 206
 207         return;
 208
 209  fail:
 210         printk(KERN_WARNING "windfarm: CPU fan config not found\n"
 211                "for this machine model, max fan speed\n");
 212
 213         if (cpufreq_clamp)
 214                 wf_control_set_max(cpufreq_clamp);
 215         if (fan_cpu_main)
 216                 wf_control_set_max(fan_cpu_main);
 217 }
 218
 219 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
 220 {
 221         s32 new_setpoint, temp, power;
 222         int rc;
 223
 224         if (--st->ticks != 0) {
 225                 if (wf_smu_readjust)
 226                         goto readjust;
 227                 return;
 228         }
 229         st->ticks = WF_SMU_CPU_FANS_INTERVAL;
 230
 231         rc = wf_sensor_get(sensor_cpu_temp, &temp);
 232         if (rc) {
 233                 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
 234                        rc);
 235                 wf_smu_failure_state |= FAILURE_SENSOR;
 236                 return;
 237         }
 238
 239         rc = wf_sensor_get(sensor_cpu_power, &power);
 240         if (rc) {
 241                 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
 242                        rc);
 243                 wf_smu_failure_state |= FAILURE_SENSOR;
 244                 return;
 245         }
 246
 247         DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
 248             FIX32TOPRINT(temp), FIX32TOPRINT(power));
 249
 250 #ifdef HACKED_OVERTEMP
 251         if (temp > 0x4a0000)
 252                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 253 #else
 254         if (temp > st->pid.param.tmax)
 255                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 256 #endif
 257         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 258
 259         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
 260
 261         if (st->cpu_setpoint == new_setpoint)
 262                 return;
 263         st->cpu_setpoint = new_setpoint;
 264  readjust:
 265         if (fan_cpu_main && wf_smu_failure_state == 0) {
 266                 rc = wf_control_set(fan_cpu_main, st->cpu_setpoint);
 267                 if (rc) {
 268                         printk(KERN_WARNING "windfarm: CPU main fan"
 269                                " error %d\n", rc);
 270                         wf_smu_failure_state |= FAILURE_FAN;
 271                 }
 272         }
 273         if (fan_cpu_second && wf_smu_failure_state == 0) {
 274                 rc = wf_control_set(fan_cpu_second, st->cpu_setpoint);
 275                 if (rc) {
 276                         printk(KERN_WARNING "windfarm: CPU second fan"
 277                                " error %d\n", rc);
 278                         wf_smu_failure_state |= FAILURE_FAN;
 279                 }
 280         }
 281         if (fan_cpu_third && wf_smu_failure_state == 0) {
 282                 rc = wf_control_set(fan_cpu_third, st->cpu_setpoint);
 283                 if (rc) {
 284                         printk(KERN_WARNING "windfarm: CPU third fan"
 285                                " error %d\n", rc);
 286                         wf_smu_failure_state |= FAILURE_FAN;
 287                 }
 288         }
 289 }
 290
 291 static void wf_smu_create_drive_fans(void)
 292 {
 293         struct wf_pid_param param = {
 294                 .interval       = 5,
 295                 .history_len    = 2,
 296                 .gd             = 0x01e00000,
 297                 .gp             = 0x00500000,
 298                 .gr             = 0x00000000,
 299                 .itarget        = 0x00200000,
 300         };
 301
 302         /* Alloc & initialize state */
 303         wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
 304                                         GFP_KERNEL);
 305         if (wf_smu_drive_fans == NULL) {
 306                 printk(KERN_WARNING "windfarm: Memory allocation error"
 307                        " max fan speed\n");
 308                 goto fail;
 309         }
 310         wf_smu_drive_fans->ticks = 1;
 311
 312         /* Fill PID params */
 313         param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
 314         param.min = wf_control_get_min(fan_hd);
 315         param.max = wf_control_get_max(fan_hd);
 316         wf_pid_init(&wf_smu_drive_fans->pid, &param);
 317
 318         DBG("wf: Drive Fan control initialized.\n");
 319         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 320             FIX32TOPRINT(param.itarget), param.min, param.max);
 321         return;
 322
 323  fail:
 324         if (fan_hd)
 325                 wf_control_set_max(fan_hd);
 326 }
 327
 328 static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
 329 {
 330         s32 new_setpoint, temp;
 331         int rc;
 332
 333         if (--st->ticks != 0) {
 334                 if (wf_smu_readjust)
 335                         goto readjust;
 336                 return;
 337         }
 338         st->ticks = st->pid.param.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: Drive 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\n", (int)new_setpoint);
 357
 358         if (st->setpoint == new_setpoint)
 359                 return;
 360         st->setpoint = new_setpoint;
 361  readjust:
 362         if (fan_hd && wf_smu_failure_state == 0) {
 363                 rc = wf_control_set(fan_hd, st->setpoint);
 364                 if (rc) {
 365                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
 366                                rc);
 367                         wf_smu_failure_state |= FAILURE_FAN;
 368                 }
 369         }
 370 }
 371
 372 static void wf_smu_create_slots_fans(void)
 373 {
 374         struct wf_pid_param param = {
 375                 .interval       = 1,
 376                 .history_len    = 8,
 377                 .gd             = 0x00000000,
 378                 .gp             = 0x00000000,
 379                 .gr             = 0x00020000,
 380                 .itarget        = 0x00000000
 381         };
 382
 383         /* Alloc & initialize state */
 384         wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
 385                                         GFP_KERNEL);
 386         if (wf_smu_slots_fans == NULL) {
 387                 printk(KERN_WARNING "windfarm: Memory allocation error"
 388                        " max fan speed\n");
 389                 goto fail;
 390         }
 391         wf_smu_slots_fans->ticks = 1;
 392
 393         /* Fill PID params */
 394         param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
 395         param.min = wf_control_get_min(fan_slots);
 396         param.max = wf_control_get_max(fan_slots);
 397         wf_pid_init(&wf_smu_slots_fans->pid, &param);
 398
 399         DBG("wf: Slots Fan control initialized.\n");
 400         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 401             FIX32TOPRINT(param.itarget), param.min, param.max);
 402         return;
 403
 404  fail:
 405         if (fan_slots)
 406                 wf_control_set_max(fan_slots);
 407 }
 408
 409 static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
 410 {
 411         s32 new_setpoint, power;
 412         int rc;
 413
 414         if (--st->ticks != 0) {
 415                 if (wf_smu_readjust)
 416                         goto readjust;
 417                 return;
 418         }
 419         st->ticks = st->pid.param.interval;
 420
 421         rc = wf_sensor_get(sensor_slots_power, &power);
 422         if (rc) {
 423                 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
 424                        rc);
 425                 wf_smu_failure_state |= FAILURE_SENSOR;
 426                 return;
 427         }
 428
 429         DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
 430             FIX32TOPRINT(power));
 431
 432 #if 0 /* Check what makes a good overtemp condition */
 433         if (power > (st->pid.param.itarget + 0x50000))
 434                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 435 #endif
 436
 437         new_setpoint = wf_pid_run(&st->pid, power);
 438
 439         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
 440
 441         if (st->setpoint == new_setpoint)
 442                 return;
 443         st->setpoint = new_setpoint;
 444  readjust:
 445         if (fan_slots && wf_smu_failure_state == 0) {
 446                 rc = wf_control_set(fan_slots, st->setpoint);
 447                 if (rc) {
 448                         printk(KERN_WARNING "windfarm: Slots fan error %d\n",
 449                                rc);
 450                         wf_smu_failure_state |= FAILURE_FAN;
 451                 }
 452         }
 453 }
 454
 455
 456 /*
 457  * ****** Setup / Init / Misc ... ******
 458  *
 459  */
 460
 461 static void wf_smu_tick(void)
 462 {
 463         unsigned int last_failure = wf_smu_failure_state;
 464         unsigned int new_failure;
 465
 466         if (!wf_smu_started) {
 467                 DBG("wf: creating control loops !\n");
 468                 wf_smu_create_drive_fans();
 469                 wf_smu_create_slots_fans();
 470                 wf_smu_create_cpu_fans();
 471                 wf_smu_started = true;
 472         }
 473
 474         /* Skipping ticks */
 475         if (wf_smu_skipping && --wf_smu_skipping)
 476                 return;
 477
 478         wf_smu_failure_state = 0;
 479         if (wf_smu_drive_fans)
 480                 wf_smu_drive_fans_tick(wf_smu_drive_fans);
 481         if (wf_smu_slots_fans)
 482                 wf_smu_slots_fans_tick(wf_smu_slots_fans);
 483         if (wf_smu_cpu_fans)
 484                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
 485
 486         wf_smu_readjust = 0;
 487         new_failure = wf_smu_failure_state & ~last_failure;
 488
 489         /* If entering failure mode, clamp cpufreq and ramp all
 490          * fans to full speed.
 491          */
 492         if (wf_smu_failure_state && !last_failure) {
 493                 if (cpufreq_clamp)
 494                         wf_control_set_max(cpufreq_clamp);
 495                 if (fan_cpu_main)
 496                         wf_control_set_max(fan_cpu_main);
 497                 if (fan_cpu_second)
 498                         wf_control_set_max(fan_cpu_second);
 499                 if (fan_cpu_third)
 500                         wf_control_set_max(fan_cpu_third);
 501                 if (fan_hd)
 502                         wf_control_set_max(fan_hd);
 503                 if (fan_slots)
 504                         wf_control_set_max(fan_slots);
 505         }
 506
 507         /* If leaving failure mode, unclamp cpufreq and readjust
 508          * all fans on next iteration
 509          */
 510         if (!wf_smu_failure_state && last_failure) {
 511                 if (cpufreq_clamp)
 512                         wf_control_set_min(cpufreq_clamp);
 513                 wf_smu_readjust = 1;
 514         }
 515
 516         /* Overtemp condition detected, notify and start skipping a couple
 517          * ticks to let the temperature go down
 518          */
 519         if (new_failure & FAILURE_OVERTEMP) {
 520                 wf_set_overtemp();
 521                 wf_smu_skipping = 2;
 522                 wf_smu_overtemp = true;
 523         }
 524
 525         /* We only clear the overtemp condition if overtemp is cleared
 526          * _and_ no other failure is present. Since a sensor error will
 527          * clear the overtemp condition (can't measure temperature) at
 528          * the control loop levels, but we don't want to keep it clear
 529          * here in this case
 530          */
 531         if (!wf_smu_failure_state && wf_smu_overtemp) {
 532                 wf_clear_overtemp();
 533                 wf_smu_overtemp = false;
 534         }
 535 }
 536
 537
 538 static void wf_smu_new_control(struct wf_control *ct)
 539 {
 540         if (wf_smu_all_controls_ok)
 541                 return;
 542
 543         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
 544                 if (wf_get_control(ct) == 0)
 545                         fan_cpu_main = ct;
 546         }
 547
 548         if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
 549                 if (wf_get_control(ct) == 0)
 550                         fan_cpu_second = ct;
 551         }
 552
 553         if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
 554                 if (wf_get_control(ct) == 0)
 555                         fan_cpu_third = ct;
 556         }
 557
 558         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
 559                 if (wf_get_control(ct) == 0)
 560                         cpufreq_clamp = ct;
 561         }
 562
 563         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
 564                 if (wf_get_control(ct) == 0)
 565                         fan_hd = ct;
 566         }
 567
 568         if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
 569                 if (wf_get_control(ct) == 0)
 570                         fan_slots = ct;
 571         }
 572
 573         if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
 574             fan_slots && cpufreq_clamp)
 575                 wf_smu_all_controls_ok = 1;
 576 }
 577
 578 static void wf_smu_new_sensor(struct wf_sensor *sr)
 579 {
 580         if (wf_smu_all_sensors_ok)
 581                 return;
 582
 583         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
 584                 if (wf_get_sensor(sr) == 0)
 585                         sensor_cpu_power = sr;
 586         }
 587
 588         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
 589                 if (wf_get_sensor(sr) == 0)
 590                         sensor_cpu_temp = sr;
 591         }
 592
 593         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
 594                 if (wf_get_sensor(sr) == 0)
 595                         sensor_hd_temp = sr;
 596         }
 597
 598         if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
 599                 if (wf_get_sensor(sr) == 0)
 600                         sensor_slots_power = sr;
 601         }
 602
 603         if (sensor_cpu_power && sensor_cpu_temp &&
 604             sensor_hd_temp && sensor_slots_power)
 605                 wf_smu_all_sensors_ok = 1;
 606 }
 607
 608
 609 static int wf_smu_notify(struct notifier_block *self,
 610                                unsigned long event, void *data)
 611 {
 612         switch(event) {
 613         case WF_EVENT_NEW_CONTROL:
 614                 DBG("wf: new control %s detected\n",
 615                     ((struct wf_control *)data)->name);
 616                 wf_smu_new_control(data);
 617                 wf_smu_readjust = 1;
 618                 break;
 619         case WF_EVENT_NEW_SENSOR:
 620                 DBG("wf: new sensor %s detected\n",
 621                     ((struct wf_sensor *)data)->name);
 622                 wf_smu_new_sensor(data);
 623                 break;
 624         case WF_EVENT_TICK:
 625                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
 626                         wf_smu_tick();
 627         }
 628
 629         return 0;
 630 }
 631
 632 static struct notifier_block wf_smu_events = {
 633         .notifier_call  = wf_smu_notify,
 634 };
 635
 636 static int wf_init_pm(void)
 637 {
 638         printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
 639
 640         return 0;
 641 }
 642
 643 static int wf_smu_probe(struct platform_device *ddev)
 644 {
 645         wf_register_client(&wf_smu_events);
 646
 647         return 0;
 648 }
 649
 650 static int wf_smu_remove(struct platform_device *ddev)
 651 {
 652         wf_unregister_client(&wf_smu_events);
 653
 654         /* XXX We don't have yet a guarantee that our callback isn't
 655          * in progress when returning from wf_unregister_client, so
 656          * we add an arbitrary delay. I'll have to fix that in the core
 657          */
 658         msleep(1000);
 659
 660         /* Release all sensors */
 661         /* One more crappy race: I don't think we have any guarantee here
 662          * that the attribute callback won't race with the sensor beeing
 663          * disposed of, and I'm not 100% certain what best way to deal
 664          * with that except by adding locks all over... I'll do that
 665          * eventually but heh, who ever rmmod this module anyway ?
 666          */
 667         if (sensor_cpu_power)
 668                 wf_put_sensor(sensor_cpu_power);
 669         if (sensor_cpu_temp)
 670                 wf_put_sensor(sensor_cpu_temp);
 671         if (sensor_hd_temp)
 672                 wf_put_sensor(sensor_hd_temp);
 673         if (sensor_slots_power)
 674                 wf_put_sensor(sensor_slots_power);
 675
 676         /* Release all controls */
 677         if (fan_cpu_main)
 678                 wf_put_control(fan_cpu_main);
 679         if (fan_cpu_second)
 680                 wf_put_control(fan_cpu_second);
 681         if (fan_cpu_third)
 682                 wf_put_control(fan_cpu_third);
 683         if (fan_hd)
 684                 wf_put_control(fan_hd);
 685         if (fan_slots)
 686                 wf_put_control(fan_slots);
 687         if (cpufreq_clamp)
 688                 wf_put_control(cpufreq_clamp);
 689
 690         /* Destroy control loops state structures */
 691         kfree(wf_smu_slots_fans);
 692         kfree(wf_smu_drive_fans);
 693         kfree(wf_smu_cpu_fans);
 694
 695         return 0;
 696 }
 697
 698 static struct platform_driver wf_smu_driver = {
 699         .probe = wf_smu_probe,
 700         .remove = wf_smu_remove,
 701         .driver = {
 702                 .name = "windfarm",
 703         },
 704 };
 705
 706
 707 static int __init wf_smu_init(void)
 708 {
 709         int rc = -ENODEV;
 710
 711         if (of_machine_is_compatible("PowerMac9,1"))
 712                 rc = wf_init_pm();
 713
 714         if (rc == 0) {
 715 #ifdef MODULE
 716                 request_module("windfarm_smu_controls");
 717                 request_module("windfarm_smu_sensors");
 718                 request_module("windfarm_lm75_sensor");
 719                 request_module("windfarm_cpufreq_clamp");
 720
 721 #endif /* MODULE */
 722                 platform_driver_register(&wf_smu_driver);
 723         }
 724
 725         return rc;
 726 }
 727
 728 static void __exit wf_smu_exit(void)
 729 {
 730
 731         platform_driver_unregister(&wf_smu_driver);
 732 }
 733
 734
 735 module_init(wf_smu_init);
 736 module_exit(wf_smu_exit);
 737
 738 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 739 MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
 740 MODULE_LICENSE("GPL");
 741
 742 MODULE_ALIAS("platform:windfarm");