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   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/system.h>
  45 #include <asm/sections.h>
  46 #include <asm/smu.h>
  47
  48 #include "windfarm.h"
  49 #include "windfarm_pid.h"
  50
  51 #define VERSION "0.4"
  52
  53 #undef DEBUG
  54
  55 #ifdef DEBUG
  56 #define DBG(args...)    printk(args)
  57 #else
  58 #define DBG(args...)    do { } while(0)
  59 #endif
  60
  61 /* define this to force CPU overtemp to 74 degree, useful for testing
  62  * the overtemp code
  63  */
  64 #undef HACKED_OVERTEMP
  65
  66 /* Controls & sensors */
  67 static struct wf_sensor *sensor_cpu_power;
  68 static struct wf_sensor *sensor_cpu_temp;
  69 static struct wf_sensor *sensor_hd_temp;
  70 static struct wf_sensor *sensor_slots_power;
  71 static struct wf_control *fan_cpu_main;
  72 static struct wf_control *fan_cpu_second;
  73 static struct wf_control *fan_cpu_third;
  74 static struct wf_control *fan_hd;
  75 static struct wf_control *fan_slots;
  76 static struct wf_control *cpufreq_clamp;
  77
  78 /* Set to kick the control loop into life */
  79 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
  80
  81 /* Failure handling.. could be nicer */
  82 #define FAILURE_FAN             0x01
  83 #define FAILURE_SENSOR          0x02
  84 #define FAILURE_OVERTEMP        0x04
  85
  86 static unsigned int wf_smu_failure_state;
  87 static int wf_smu_readjust, wf_smu_skipping;
  88
  89 /*
  90  * ****** CPU Fans Control Loop ******
  91  *
  92  */
  93
  94
  95 #define WF_SMU_CPU_FANS_INTERVAL        1
  96 #define WF_SMU_CPU_FANS_MAX_HISTORY     16
  97
  98 /* State data used by the cpu fans control loop
  99  */
 100 struct wf_smu_cpu_fans_state {
 101         int                     ticks;
 102         s32                     cpu_setpoint;
 103         struct wf_cpu_pid_state pid;
 104 };
 105
 106 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
 107
 108
 109
 110 /*
 111  * ****** Drive Fan Control Loop ******
 112  *
 113  */
 114
 115 struct wf_smu_drive_fans_state {
 116         int                     ticks;
 117         s32                     setpoint;
 118         struct wf_pid_state     pid;
 119 };
 120
 121 static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
 122
 123 /*
 124  * ****** Slots Fan Control Loop ******
 125  *
 126  */
 127
 128 struct wf_smu_slots_fans_state {
 129         int                     ticks;
 130         s32                     setpoint;
 131         struct wf_pid_state     pid;
 132 };
 133
 134 static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
 135
 136 /*
 137  * ***** Implementation *****
 138  *
 139  */
 140
 141
 142 static void wf_smu_create_cpu_fans(void)
 143 {
 144         struct wf_cpu_pid_param pid_param;
 145         const struct smu_sdbp_header *hdr;
 146         struct smu_sdbp_cpupiddata *piddata;
 147         struct smu_sdbp_fvt *fvt;
 148         s32 tmax, tdelta, maxpow, powadj;
 149
 150         /* First, locate the PID params in SMU SBD */
 151         hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
 152         if (hdr == 0) {
 153                 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
 154                        "max fan speed\n");
 155                 goto fail;
 156         }
 157         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 158
 159         /* Get the FVT params for operating point 0 (the only supported one
 160          * for now) in order to get tmax
 161          */
 162         hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
 163         if (hdr) {
 164                 fvt = (struct smu_sdbp_fvt *)&hdr[1];
 165                 tmax = ((s32)fvt->maxtemp) << 16;
 166         } else
 167                 tmax = 0x5e0000; /* 94 degree default */
 168
 169         /* Alloc & initialize state */
 170         wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
 171                                   GFP_KERNEL);
 172         if (wf_smu_cpu_fans == NULL)
 173                 goto fail;
 174         wf_smu_cpu_fans->ticks = 1;
 175
 176         /* Fill PID params */
 177         pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
 178         pid_param.history_len = piddata->history_len;
 179         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 180                 printk(KERN_WARNING "windfarm: History size overflow on "
 181                        "CPU control loop (%d)\n", piddata->history_len);
 182                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 183         }
 184         pid_param.gd = piddata->gd;
 185         pid_param.gp = piddata->gp;
 186         pid_param.gr = piddata->gr / pid_param.history_len;
 187
 188         tdelta = ((s32)piddata->target_temp_delta) << 16;
 189         maxpow = ((s32)piddata->max_power) << 16;
 190         powadj = ((s32)piddata->power_adj) << 16;
 191
 192         pid_param.tmax = tmax;
 193         pid_param.ttarget = tmax - tdelta;
 194         pid_param.pmaxadj = maxpow - powadj;
 195
 196         pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
 197         pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);
 198
 199         wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
 200
 201         DBG("wf: CPU Fan control initialized.\n");
 202         DBG("    ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
 203             FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 204             pid_param.min, pid_param.max);
 205
 206         return;
 207
 208  fail:
 209         printk(KERN_WARNING "windfarm: CPU fan config not found\n"
 210                "for this machine model, max fan speed\n");
 211
 212         if (cpufreq_clamp)
 213                 wf_control_set_max(cpufreq_clamp);
 214         if (fan_cpu_main)
 215                 wf_control_set_max(fan_cpu_main);
 216 }
 217
 218 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
 219 {
 220         s32 new_setpoint, temp, power;
 221         int rc;
 222
 223         if (--st->ticks != 0) {
 224                 if (wf_smu_readjust)
 225                         goto readjust;
 226                 return;
 227         }
 228         st->ticks = WF_SMU_CPU_FANS_INTERVAL;
 229
 230         rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
 231         if (rc) {
 232                 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
 233                        rc);
 234                 wf_smu_failure_state |= FAILURE_SENSOR;
 235                 return;
 236         }
 237
 238         rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
 239         if (rc) {
 240                 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
 241                        rc);
 242                 wf_smu_failure_state |= FAILURE_SENSOR;
 243                 return;
 244         }
 245
 246         DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
 247             FIX32TOPRINT(temp), FIX32TOPRINT(power));
 248
 249 #ifdef HACKED_OVERTEMP
 250         if (temp > 0x4a0000)
 251                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 252 #else
 253         if (temp > st->pid.param.tmax)
 254                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 255 #endif
 256         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 257
 258         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
 259
 260         if (st->cpu_setpoint == new_setpoint)
 261                 return;
 262         st->cpu_setpoint = new_setpoint;
 263  readjust:
 264         if (fan_cpu_main && wf_smu_failure_state == 0) {
 265                 rc = fan_cpu_main->ops->set_value(fan_cpu_main,
 266                                                   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 = fan_cpu_second->ops->set_value(fan_cpu_second,
 275                                                     st->cpu_setpoint);
 276                 if (rc) {
 277                         printk(KERN_WARNING "windfarm: CPU second fan"
 278                                " error %d\n", rc);
 279                         wf_smu_failure_state |= FAILURE_FAN;
 280                 }
 281         }
 282         if (fan_cpu_third && wf_smu_failure_state == 0) {
 283                 rc = fan_cpu_main->ops->set_value(fan_cpu_third,
 284                                                   st->cpu_setpoint);
 285                 if (rc) {
 286                         printk(KERN_WARNING "windfarm: CPU third fan"
 287                                " error %d\n", rc);
 288                         wf_smu_failure_state |= FAILURE_FAN;
 289                 }
 290         }
 291 }
 292
 293 static void wf_smu_create_drive_fans(void)
 294 {
 295         struct wf_pid_param param = {
 296                 .interval       = 5,
 297                 .history_len    = 2,
 298                 .gd             = 0x01e00000,
 299                 .gp             = 0x00500000,
 300                 .gr             = 0x00000000,
 301                 .itarget        = 0x00200000,
 302         };
 303
 304         /* Alloc & initialize state */
 305         wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
 306                                         GFP_KERNEL);
 307         if (wf_smu_drive_fans == NULL) {
 308                 printk(KERN_WARNING "windfarm: Memory allocation error"
 309                        " max fan speed\n");
 310                 goto fail;
 311         }
 312         wf_smu_drive_fans->ticks = 1;
 313
 314         /* Fill PID params */
 315         param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
 316         param.min = fan_hd->ops->get_min(fan_hd);
 317         param.max = fan_hd->ops->get_max(fan_hd);
 318         wf_pid_init(&wf_smu_drive_fans->pid, &param);
 319
 320         DBG("wf: Drive Fan control initialized.\n");
 321         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 322             FIX32TOPRINT(param.itarget), param.min, param.max);
 323         return;
 324
 325  fail:
 326         if (fan_hd)
 327                 wf_control_set_max(fan_hd);
 328 }
 329
 330 static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
 331 {
 332         s32 new_setpoint, temp;
 333         int rc;
 334
 335         if (--st->ticks != 0) {
 336                 if (wf_smu_readjust)
 337                         goto readjust;
 338                 return;
 339         }
 340         st->ticks = st->pid.param.interval;
 341
 342         rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
 343         if (rc) {
 344                 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
 345                        rc);
 346                 wf_smu_failure_state |= FAILURE_SENSOR;
 347                 return;
 348         }
 349
 350         DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
 351             FIX32TOPRINT(temp));
 352
 353         if (temp > (st->pid.param.itarget + 0x50000))
 354                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 355
 356         new_setpoint = wf_pid_run(&st->pid, temp);
 357
 358         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
 359
 360         if (st->setpoint == new_setpoint)
 361                 return;
 362         st->setpoint = new_setpoint;
 363  readjust:
 364         if (fan_hd && wf_smu_failure_state == 0) {
 365                 rc = fan_hd->ops->set_value(fan_hd, st->setpoint);
 366                 if (rc) {
 367                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
 368                                rc);
 369                         wf_smu_failure_state |= FAILURE_FAN;
 370                 }
 371         }
 372 }
 373
 374 static void wf_smu_create_slots_fans(void)
 375 {
 376         struct wf_pid_param param = {
 377                 .interval       = 1,
 378                 .history_len    = 8,
 379                 .gd             = 0x00000000,
 380                 .gp             = 0x00000000,
 381                 .gr             = 0x00020000,
 382                 .itarget        = 0x00000000
 383         };
 384
 385         /* Alloc & initialize state */
 386         wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
 387                                         GFP_KERNEL);
 388         if (wf_smu_slots_fans == NULL) {
 389                 printk(KERN_WARNING "windfarm: Memory allocation error"
 390                        " max fan speed\n");
 391                 goto fail;
 392         }
 393         wf_smu_slots_fans->ticks = 1;
 394
 395         /* Fill PID params */
 396         param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
 397         param.min = fan_slots->ops->get_min(fan_slots);
 398         param.max = fan_slots->ops->get_max(fan_slots);
 399         wf_pid_init(&wf_smu_slots_fans->pid, &param);
 400
 401         DBG("wf: Slots Fan control initialized.\n");
 402         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 403             FIX32TOPRINT(param.itarget), param.min, param.max);
 404         return;
 405
 406  fail:
 407         if (fan_slots)
 408                 wf_control_set_max(fan_slots);
 409 }
 410
 411 static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
 412 {
 413         s32 new_setpoint, power;
 414         int rc;
 415
 416         if (--st->ticks != 0) {
 417                 if (wf_smu_readjust)
 418                         goto readjust;
 419                 return;
 420         }
 421         st->ticks = st->pid.param.interval;
 422
 423         rc = sensor_slots_power->ops->get_value(sensor_slots_power, &power);
 424         if (rc) {
 425                 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
 426                        rc);
 427                 wf_smu_failure_state |= FAILURE_SENSOR;
 428                 return;
 429         }
 430
 431         DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
 432             FIX32TOPRINT(power));
 433
 434 #if 0 /* Check what makes a good overtemp condition */
 435         if (power > (st->pid.param.itarget + 0x50000))
 436                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 437 #endif
 438
 439         new_setpoint = wf_pid_run(&st->pid, power);
 440
 441         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
 442
 443         if (st->setpoint == new_setpoint)
 444                 return;
 445         st->setpoint = new_setpoint;
 446  readjust:
 447         if (fan_slots && wf_smu_failure_state == 0) {
 448                 rc = fan_slots->ops->set_value(fan_slots, st->setpoint);
 449                 if (rc) {
 450                         printk(KERN_WARNING "windfarm: Slots fan error %d\n",
 451                                rc);
 452                         wf_smu_failure_state |= FAILURE_FAN;
 453                 }
 454         }
 455 }
 456
 457
 458 /*
 459  * ****** Setup / Init / Misc ... ******
 460  *
 461  */
 462
 463 static void wf_smu_tick(void)
 464 {
 465         unsigned int last_failure = wf_smu_failure_state;
 466         unsigned int new_failure;
 467
 468         if (!wf_smu_started) {
 469                 DBG("wf: creating control loops !\n");
 470                 wf_smu_create_drive_fans();
 471                 wf_smu_create_slots_fans();
 472                 wf_smu_create_cpu_fans();
 473                 wf_smu_started = 1;
 474         }
 475
 476         /* Skipping ticks */
 477         if (wf_smu_skipping && --wf_smu_skipping)
 478                 return;
 479
 480         wf_smu_failure_state = 0;
 481         if (wf_smu_drive_fans)
 482                 wf_smu_drive_fans_tick(wf_smu_drive_fans);
 483         if (wf_smu_slots_fans)
 484                 wf_smu_slots_fans_tick(wf_smu_slots_fans);
 485         if (wf_smu_cpu_fans)
 486                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
 487
 488         wf_smu_readjust = 0;
 489         new_failure = wf_smu_failure_state & ~last_failure;
 490
 491         /* If entering failure mode, clamp cpufreq and ramp all
 492          * fans to full speed.
 493          */
 494         if (wf_smu_failure_state && !last_failure) {
 495                 if (cpufreq_clamp)
 496                         wf_control_set_max(cpufreq_clamp);
 497                 if (fan_cpu_main)
 498                         wf_control_set_max(fan_cpu_main);
 499                 if (fan_cpu_second)
 500                         wf_control_set_max(fan_cpu_second);
 501                 if (fan_cpu_third)
 502                         wf_control_set_max(fan_cpu_third);
 503                 if (fan_hd)
 504                         wf_control_set_max(fan_hd);
 505                 if (fan_slots)
 506                         wf_control_set_max(fan_slots);
 507         }
 508
 509         /* If leaving failure mode, unclamp cpufreq and readjust
 510          * all fans on next iteration
 511          */
 512         if (!wf_smu_failure_state && last_failure) {
 513                 if (cpufreq_clamp)
 514                         wf_control_set_min(cpufreq_clamp);
 515                 wf_smu_readjust = 1;
 516         }
 517
 518         /* Overtemp condition detected, notify and start skipping a couple
 519          * ticks to let the temperature go down
 520          */
 521         if (new_failure & FAILURE_OVERTEMP) {
 522                 wf_set_overtemp();
 523                 wf_smu_skipping = 2;
 524         }
 525
 526         /* We only clear the overtemp condition if overtemp is cleared
 527          * _and_ no other failure is present. Since a sensor error will
 528          * clear the overtemp condition (can't measure temperature) at
 529          * the control loop levels, but we don't want to keep it clear
 530          * here in this case
 531          */
 532         if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
 533                 wf_clear_overtemp();
 534 }
 535
 536
 537 static void wf_smu_new_control(struct wf_control *ct)
 538 {
 539         if (wf_smu_all_controls_ok)
 540                 return;
 541
 542         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
 543                 if (wf_get_control(ct) == 0)
 544                         fan_cpu_main = ct;
 545         }
 546
 547         if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
 548                 if (wf_get_control(ct) == 0)
 549                         fan_cpu_second = ct;
 550         }
 551
 552         if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
 553                 if (wf_get_control(ct) == 0)
 554                         fan_cpu_third = ct;
 555         }
 556
 557         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
 558                 if (wf_get_control(ct) == 0)
 559                         cpufreq_clamp = ct;
 560         }
 561
 562         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
 563                 if (wf_get_control(ct) == 0)
 564                         fan_hd = ct;
 565         }
 566
 567         if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
 568                 if (wf_get_control(ct) == 0)
 569                         fan_slots = ct;
 570         }
 571
 572         if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
 573             fan_slots && cpufreq_clamp)
 574                 wf_smu_all_controls_ok = 1;
 575 }
 576
 577 static void wf_smu_new_sensor(struct wf_sensor *sr)
 578 {
 579         if (wf_smu_all_sensors_ok)
 580                 return;
 581
 582         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
 583                 if (wf_get_sensor(sr) == 0)
 584                         sensor_cpu_power = sr;
 585         }
 586
 587         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
 588                 if (wf_get_sensor(sr) == 0)
 589                         sensor_cpu_temp = sr;
 590         }
 591
 592         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
 593                 if (wf_get_sensor(sr) == 0)
 594                         sensor_hd_temp = sr;
 595         }
 596
 597         if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
 598                 if (wf_get_sensor(sr) == 0)
 599                         sensor_slots_power = sr;
 600         }
 601
 602         if (sensor_cpu_power && sensor_cpu_temp &&
 603             sensor_hd_temp && sensor_slots_power)
 604                 wf_smu_all_sensors_ok = 1;
 605 }
 606
 607
 608 static int wf_smu_notify(struct notifier_block *self,
 609                                unsigned long event, void *data)
 610 {
 611         switch(event) {
 612         case WF_EVENT_NEW_CONTROL:
 613                 DBG("wf: new control %s detected\n",
 614                     ((struct wf_control *)data)->name);
 615                 wf_smu_new_control(data);
 616                 wf_smu_readjust = 1;
 617                 break;
 618         case WF_EVENT_NEW_SENSOR:
 619                 DBG("wf: new sensor %s detected\n",
 620                     ((struct wf_sensor *)data)->name);
 621                 wf_smu_new_sensor(data);
 622                 break;
 623         case WF_EVENT_TICK:
 624                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
 625                         wf_smu_tick();
 626         }
 627
 628         return 0;
 629 }
 630
 631 static struct notifier_block wf_smu_events = {
 632         .notifier_call  = wf_smu_notify,
 633 };
 634
 635 static int wf_init_pm(void)
 636 {
 637         printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
 638
 639         return 0;
 640 }
 641
 642 static int wf_smu_probe(struct platform_device *ddev)
 643 {
 644         wf_register_client(&wf_smu_events);
 645
 646         return 0;
 647 }
 648
 649 static int __devexit wf_smu_remove(struct platform_device *ddev)
 650 {
 651         wf_unregister_client(&wf_smu_events);
 652
 653         /* XXX We don't have yet a guarantee that our callback isn't
 654          * in progress when returning from wf_unregister_client, so
 655          * we add an arbitrary delay. I'll have to fix that in the core
 656          */
 657         msleep(1000);
 658
 659         /* Release all sensors */
 660         /* One more crappy race: I don't think we have any guarantee here
 661          * that the attribute callback won't race with the sensor beeing
 662          * disposed of, and I'm not 100% certain what best way to deal
 663          * with that except by adding locks all over... I'll do that
 664          * eventually but heh, who ever rmmod this module anyway ?
 665          */
 666         if (sensor_cpu_power)
 667                 wf_put_sensor(sensor_cpu_power);
 668         if (sensor_cpu_temp)
 669                 wf_put_sensor(sensor_cpu_temp);
 670         if (sensor_hd_temp)
 671                 wf_put_sensor(sensor_hd_temp);
 672         if (sensor_slots_power)
 673                 wf_put_sensor(sensor_slots_power);
 674
 675         /* Release all controls */
 676         if (fan_cpu_main)
 677                 wf_put_control(fan_cpu_main);
 678         if (fan_cpu_second)
 679                 wf_put_control(fan_cpu_second);
 680         if (fan_cpu_third)
 681                 wf_put_control(fan_cpu_third);
 682         if (fan_hd)
 683                 wf_put_control(fan_hd);
 684         if (fan_slots)
 685                 wf_put_control(fan_slots);
 686         if (cpufreq_clamp)
 687                 wf_put_control(cpufreq_clamp);
 688
 689         /* Destroy control loops state structures */
 690         if (wf_smu_slots_fans)
 691                 kfree(wf_smu_cpu_fans);
 692         if (wf_smu_drive_fans)
 693                 kfree(wf_smu_cpu_fans);
 694         if (wf_smu_cpu_fans)
 695                 kfree(wf_smu_cpu_fans);
 696
 697         return 0;
 698 }
 699
 700 static struct platform_driver wf_smu_driver = {
 701         .probe = wf_smu_probe,
 702         .remove = __devexit_p(wf_smu_remove),
 703         .driver = {
 704                 .name = "windfarm",
 705                 .bus = &platform_bus_type,
 706         },
 707 };
 708
 709
 710 static int __init wf_smu_init(void)
 711 {
 712         int rc = -ENODEV;
 713
 714         if (machine_is_compatible("PowerMac9,1"))
 715                 rc = wf_init_pm();
 716
 717         if (rc == 0) {
 718 #ifdef MODULE
 719                 request_module("windfarm_smu_controls");
 720                 request_module("windfarm_smu_sensors");
 721                 request_module("windfarm_lm75_sensor");
 722                 request_module("windfarm_cpufreq_clamp");
 723
 724 #endif /* MODULE */
 725                 platform_driver_register(&wf_smu_driver);
 726         }
 727
 728         return rc;
 729 }
 730
 731 static void __exit wf_smu_exit(void)
 732 {
 733
 734         platform_driver_unregister(&wf_smu_driver);
 735 }
 736
 737
 738 module_init(wf_smu_init);
 739 module_exit(wf_smu_exit);
 740
 741 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 742 MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
 743 MODULE_LICENSE("GPL");
 744