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, wf_smu_started;
  79
  80 /* Failure handling.. could be nicer */
  81 #define FAILURE_FAN             0x01
  82 #define FAILURE_SENSOR          0x02
  83 #define FAILURE_OVERTEMP        0x04
  84
  85 static unsigned int wf_smu_failure_state;
  86 static int wf_smu_readjust, wf_smu_skipping;
  87
  88 /*
  89  * ****** CPU Fans Control Loop ******
  90  *
  91  */
  92
  93
  94 #define WF_SMU_CPU_FANS_INTERVAL        1
  95 #define WF_SMU_CPU_FANS_MAX_HISTORY     16
  96
  97 /* State data used by the cpu fans control loop
  98  */
  99 struct wf_smu_cpu_fans_state {
 100         int                     ticks;
 101         s32                     cpu_setpoint;
 102         struct wf_cpu_pid_state pid;
 103 };
 104
 105 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
 106
 107
 108
 109 /*
 110  * ****** Drive Fan Control Loop ******
 111  *
 112  */
 113
 114 struct wf_smu_drive_fans_state {
 115         int                     ticks;
 116         s32                     setpoint;
 117         struct wf_pid_state     pid;
 118 };
 119
 120 static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
 121
 122 /*
 123  * ****** Slots Fan Control Loop ******
 124  *
 125  */
 126
 127 struct wf_smu_slots_fans_state {
 128         int                     ticks;
 129         s32                     setpoint;
 130         struct wf_pid_state     pid;
 131 };
 132
 133 static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
 134
 135 /*
 136  * ***** Implementation *****
 137  *
 138  */
 139
 140
 141 static void wf_smu_create_cpu_fans(void)
 142 {
 143         struct wf_cpu_pid_param pid_param;
 144         const struct smu_sdbp_header *hdr;
 145         struct smu_sdbp_cpupiddata *piddata;
 146         struct smu_sdbp_fvt *fvt;
 147         s32 tmax, tdelta, maxpow, powadj;
 148
 149         /* First, locate the PID params in SMU SBD */
 150         hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
 151         if (hdr == 0) {
 152                 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
 153                        "max fan speed\n");
 154                 goto fail;
 155         }
 156         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 157
 158         /* Get the FVT params for operating point 0 (the only supported one
 159          * for now) in order to get tmax
 160          */
 161         hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
 162         if (hdr) {
 163                 fvt = (struct smu_sdbp_fvt *)&hdr[1];
 164                 tmax = ((s32)fvt->maxtemp) << 16;
 165         } else
 166                 tmax = 0x5e0000; /* 94 degree default */
 167
 168         /* Alloc & initialize state */
 169         wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
 170                                   GFP_KERNEL);
 171         if (wf_smu_cpu_fans == NULL)
 172                 goto fail;
 173         wf_smu_cpu_fans->ticks = 1;
 174
 175         /* Fill PID params */
 176         pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
 177         pid_param.history_len = piddata->history_len;
 178         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 179                 printk(KERN_WARNING "windfarm: History size overflow on "
 180                        "CPU control loop (%d)\n", piddata->history_len);
 181                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 182         }
 183         pid_param.gd = piddata->gd;
 184         pid_param.gp = piddata->gp;
 185         pid_param.gr = piddata->gr / pid_param.history_len;
 186
 187         tdelta = ((s32)piddata->target_temp_delta) << 16;
 188         maxpow = ((s32)piddata->max_power) << 16;
 189         powadj = ((s32)piddata->power_adj) << 16;
 190
 191         pid_param.tmax = tmax;
 192         pid_param.ttarget = tmax - tdelta;
 193         pid_param.pmaxadj = maxpow - powadj;
 194
 195         pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
 196         pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);
 197
 198         wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
 199
 200         DBG("wf: CPU Fan control initialized.\n");
 201         DBG("    ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
 202             FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 203             pid_param.min, pid_param.max);
 204
 205         return;
 206
 207  fail:
 208         printk(KERN_WARNING "windfarm: CPU fan config not found\n"
 209                "for this machine model, max fan speed\n");
 210
 211         if (cpufreq_clamp)
 212                 wf_control_set_max(cpufreq_clamp);
 213         if (fan_cpu_main)
 214                 wf_control_set_max(fan_cpu_main);
 215 }
 216
 217 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
 218 {
 219         s32 new_setpoint, temp, power;
 220         int rc;
 221
 222         if (--st->ticks != 0) {
 223                 if (wf_smu_readjust)
 224                         goto readjust;
 225                 return;
 226         }
 227         st->ticks = WF_SMU_CPU_FANS_INTERVAL;
 228
 229         rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
 230         if (rc) {
 231                 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
 232                        rc);
 233                 wf_smu_failure_state |= FAILURE_SENSOR;
 234                 return;
 235         }
 236
 237         rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
 238         if (rc) {
 239                 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
 240                        rc);
 241                 wf_smu_failure_state |= FAILURE_SENSOR;
 242                 return;
 243         }
 244
 245         DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
 246             FIX32TOPRINT(temp), FIX32TOPRINT(power));
 247
 248 #ifdef HACKED_OVERTEMP
 249         if (temp > 0x4a0000)
 250                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 251 #else
 252         if (temp > st->pid.param.tmax)
 253                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 254 #endif
 255         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 256
 257         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
 258
 259         if (st->cpu_setpoint == new_setpoint)
 260                 return;
 261         st->cpu_setpoint = new_setpoint;
 262  readjust:
 263         if (fan_cpu_main && wf_smu_failure_state == 0) {
 264                 rc = fan_cpu_main->ops->set_value(fan_cpu_main,
 265                                                   st->cpu_setpoint);
 266                 if (rc) {
 267                         printk(KERN_WARNING "windfarm: CPU main fan"
 268                                " error %d\n", rc);
 269                         wf_smu_failure_state |= FAILURE_FAN;
 270                 }
 271         }
 272         if (fan_cpu_second && wf_smu_failure_state == 0) {
 273                 rc = fan_cpu_second->ops->set_value(fan_cpu_second,
 274                                                     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 = fan_cpu_main->ops->set_value(fan_cpu_third,
 283                                                   st->cpu_setpoint);
 284                 if (rc) {
 285                         printk(KERN_WARNING "windfarm: CPU third fan"
 286                                " error %d\n", rc);
 287                         wf_smu_failure_state |= FAILURE_FAN;
 288                 }
 289         }
 290 }
 291
 292 static void wf_smu_create_drive_fans(void)
 293 {
 294         struct wf_pid_param param = {
 295                 .interval       = 5,
 296                 .history_len    = 2,
 297                 .gd             = 0x01e00000,
 298                 .gp             = 0x00500000,
 299                 .gr             = 0x00000000,
 300                 .itarget        = 0x00200000,
 301         };
 302
 303         /* Alloc & initialize state */
 304         wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
 305                                         GFP_KERNEL);
 306         if (wf_smu_drive_fans == NULL) {
 307                 printk(KERN_WARNING "windfarm: Memory allocation error"
 308                        " max fan speed\n");
 309                 goto fail;
 310         }
 311         wf_smu_drive_fans->ticks = 1;
 312
 313         /* Fill PID params */
 314         param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
 315         param.min = fan_hd->ops->get_min(fan_hd);
 316         param.max = fan_hd->ops->get_max(fan_hd);
 317         wf_pid_init(&wf_smu_drive_fans->pid, &param);
 318
 319         DBG("wf: Drive Fan control initialized.\n");
 320         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 321             FIX32TOPRINT(param.itarget), param.min, param.max);
 322         return;
 323
 324  fail:
 325         if (fan_hd)
 326                 wf_control_set_max(fan_hd);
 327 }
 328
 329 static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
 330 {
 331         s32 new_setpoint, temp;
 332         int rc;
 333
 334         if (--st->ticks != 0) {
 335                 if (wf_smu_readjust)
 336                         goto readjust;
 337                 return;
 338         }
 339         st->ticks = st->pid.param.interval;
 340
 341         rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
 342         if (rc) {
 343                 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
 344                        rc);
 345                 wf_smu_failure_state |= FAILURE_SENSOR;
 346                 return;
 347         }
 348
 349         DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
 350             FIX32TOPRINT(temp));
 351
 352         if (temp > (st->pid.param.itarget + 0x50000))
 353                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 354
 355         new_setpoint = wf_pid_run(&st->pid, temp);
 356
 357         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
 358
 359         if (st->setpoint == new_setpoint)
 360                 return;
 361         st->setpoint = new_setpoint;
 362  readjust:
 363         if (fan_hd && wf_smu_failure_state == 0) {
 364                 rc = fan_hd->ops->set_value(fan_hd, st->setpoint);
 365                 if (rc) {
 366                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
 367                                rc);
 368                         wf_smu_failure_state |= FAILURE_FAN;
 369                 }
 370         }
 371 }
 372
 373 static void wf_smu_create_slots_fans(void)
 374 {
 375         struct wf_pid_param param = {
 376                 .interval       = 1,
 377                 .history_len    = 8,
 378                 .gd             = 0x00000000,
 379                 .gp             = 0x00000000,
 380                 .gr             = 0x00020000,
 381                 .itarget        = 0x00000000
 382         };
 383
 384         /* Alloc & initialize state */
 385         wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
 386                                         GFP_KERNEL);
 387         if (wf_smu_slots_fans == NULL) {
 388                 printk(KERN_WARNING "windfarm: Memory allocation error"
 389                        " max fan speed\n");
 390                 goto fail;
 391         }
 392         wf_smu_slots_fans->ticks = 1;
 393
 394         /* Fill PID params */
 395         param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
 396         param.min = fan_slots->ops->get_min(fan_slots);
 397         param.max = fan_slots->ops->get_max(fan_slots);
 398         wf_pid_init(&wf_smu_slots_fans->pid, &param);
 399
 400         DBG("wf: Slots Fan control initialized.\n");
 401         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 402             FIX32TOPRINT(param.itarget), param.min, param.max);
 403         return;
 404
 405  fail:
 406         if (fan_slots)
 407                 wf_control_set_max(fan_slots);
 408 }
 409
 410 static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
 411 {
 412         s32 new_setpoint, power;
 413         int rc;
 414
 415         if (--st->ticks != 0) {
 416                 if (wf_smu_readjust)
 417                         goto readjust;
 418                 return;
 419         }
 420         st->ticks = st->pid.param.interval;
 421
 422         rc = sensor_slots_power->ops->get_value(sensor_slots_power, &power);
 423         if (rc) {
 424                 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
 425                        rc);
 426                 wf_smu_failure_state |= FAILURE_SENSOR;
 427                 return;
 428         }
 429
 430         DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
 431             FIX32TOPRINT(power));
 432
 433 #if 0 /* Check what makes a good overtemp condition */
 434         if (power > (st->pid.param.itarget + 0x50000))
 435                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 436 #endif
 437
 438         new_setpoint = wf_pid_run(&st->pid, power);
 439
 440         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
 441
 442         if (st->setpoint == new_setpoint)
 443                 return;
 444         st->setpoint = new_setpoint;
 445  readjust:
 446         if (fan_slots && wf_smu_failure_state == 0) {
 447                 rc = fan_slots->ops->set_value(fan_slots, st->setpoint);
 448                 if (rc) {
 449                         printk(KERN_WARNING "windfarm: Slots fan error %d\n",
 450                                rc);
 451                         wf_smu_failure_state |= FAILURE_FAN;
 452                 }
 453         }
 454 }
 455
 456
 457 /*
 458  * ****** Setup / Init / Misc ... ******
 459  *
 460  */
 461
 462 static void wf_smu_tick(void)
 463 {
 464         unsigned int last_failure = wf_smu_failure_state;
 465         unsigned int new_failure;
 466
 467         if (!wf_smu_started) {
 468                 DBG("wf: creating control loops !\n");
 469                 wf_smu_create_drive_fans();
 470                 wf_smu_create_slots_fans();
 471                 wf_smu_create_cpu_fans();
 472                 wf_smu_started = 1;
 473         }
 474
 475         /* Skipping ticks */
 476         if (wf_smu_skipping && --wf_smu_skipping)
 477                 return;
 478
 479         wf_smu_failure_state = 0;
 480         if (wf_smu_drive_fans)
 481                 wf_smu_drive_fans_tick(wf_smu_drive_fans);
 482         if (wf_smu_slots_fans)
 483                 wf_smu_slots_fans_tick(wf_smu_slots_fans);
 484         if (wf_smu_cpu_fans)
 485                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
 486
 487         wf_smu_readjust = 0;
 488         new_failure = wf_smu_failure_state & ~last_failure;
 489
 490         /* If entering failure mode, clamp cpufreq and ramp all
 491          * fans to full speed.
 492          */
 493         if (wf_smu_failure_state && !last_failure) {
 494                 if (cpufreq_clamp)
 495                         wf_control_set_max(cpufreq_clamp);
 496                 if (fan_cpu_main)
 497                         wf_control_set_max(fan_cpu_main);
 498                 if (fan_cpu_second)
 499                         wf_control_set_max(fan_cpu_second);
 500                 if (fan_cpu_third)
 501                         wf_control_set_max(fan_cpu_third);
 502                 if (fan_hd)
 503                         wf_control_set_max(fan_hd);
 504                 if (fan_slots)
 505                         wf_control_set_max(fan_slots);
 506         }
 507
 508         /* If leaving failure mode, unclamp cpufreq and readjust
 509          * all fans on next iteration
 510          */
 511         if (!wf_smu_failure_state && last_failure) {
 512                 if (cpufreq_clamp)
 513                         wf_control_set_min(cpufreq_clamp);
 514                 wf_smu_readjust = 1;
 515         }
 516
 517         /* Overtemp condition detected, notify and start skipping a couple
 518          * ticks to let the temperature go down
 519          */
 520         if (new_failure & FAILURE_OVERTEMP) {
 521                 wf_set_overtemp();
 522                 wf_smu_skipping = 2;
 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 (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
 532                 wf_clear_overtemp();
 533 }
 534
 535
 536 static void wf_smu_new_control(struct wf_control *ct)
 537 {
 538         if (wf_smu_all_controls_ok)
 539                 return;
 540
 541         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
 542                 if (wf_get_control(ct) == 0)
 543                         fan_cpu_main = ct;
 544         }
 545
 546         if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
 547                 if (wf_get_control(ct) == 0)
 548                         fan_cpu_second = ct;
 549         }
 550
 551         if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
 552                 if (wf_get_control(ct) == 0)
 553                         fan_cpu_third = ct;
 554         }
 555
 556         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
 557                 if (wf_get_control(ct) == 0)
 558                         cpufreq_clamp = ct;
 559         }
 560
 561         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
 562                 if (wf_get_control(ct) == 0)
 563                         fan_hd = ct;
 564         }
 565
 566         if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
 567                 if (wf_get_control(ct) == 0)
 568                         fan_slots = ct;
 569         }
 570
 571         if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
 572             fan_slots && cpufreq_clamp)
 573                 wf_smu_all_controls_ok = 1;
 574 }
 575
 576 static void wf_smu_new_sensor(struct wf_sensor *sr)
 577 {
 578         if (wf_smu_all_sensors_ok)
 579                 return;
 580
 581         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
 582                 if (wf_get_sensor(sr) == 0)
 583                         sensor_cpu_power = sr;
 584         }
 585
 586         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
 587                 if (wf_get_sensor(sr) == 0)
 588                         sensor_cpu_temp = sr;
 589         }
 590
 591         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
 592                 if (wf_get_sensor(sr) == 0)
 593                         sensor_hd_temp = sr;
 594         }
 595
 596         if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
 597                 if (wf_get_sensor(sr) == 0)
 598                         sensor_slots_power = sr;
 599         }
 600
 601         if (sensor_cpu_power && sensor_cpu_temp &&
 602             sensor_hd_temp && sensor_slots_power)
 603                 wf_smu_all_sensors_ok = 1;
 604 }
 605
 606
 607 static int wf_smu_notify(struct notifier_block *self,
 608                                unsigned long event, void *data)
 609 {
 610         switch(event) {
 611         case WF_EVENT_NEW_CONTROL:
 612                 DBG("wf: new control %s detected\n",
 613                     ((struct wf_control *)data)->name);
 614                 wf_smu_new_control(data);
 615                 wf_smu_readjust = 1;
 616                 break;
 617         case WF_EVENT_NEW_SENSOR:
 618                 DBG("wf: new sensor %s detected\n",
 619                     ((struct wf_sensor *)data)->name);
 620                 wf_smu_new_sensor(data);
 621                 break;
 622         case WF_EVENT_TICK:
 623                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
 624                         wf_smu_tick();
 625         }
 626
 627         return 0;
 628 }
 629
 630 static struct notifier_block wf_smu_events = {
 631         .notifier_call  = wf_smu_notify,
 632 };
 633
 634 static int wf_init_pm(void)
 635 {
 636         printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
 637
 638         return 0;
 639 }
 640
 641 static int wf_smu_probe(struct platform_device *ddev)
 642 {
 643         wf_register_client(&wf_smu_events);
 644
 645         return 0;
 646 }
 647
 648 static int __devexit wf_smu_remove(struct platform_device *ddev)
 649 {
 650         wf_unregister_client(&wf_smu_events);
 651
 652         /* XXX We don't have yet a guarantee that our callback isn't
 653          * in progress when returning from wf_unregister_client, so
 654          * we add an arbitrary delay. I'll have to fix that in the core
 655          */
 656         msleep(1000);
 657
 658         /* Release all sensors */
 659         /* One more crappy race: I don't think we have any guarantee here
 660          * that the attribute callback won't race with the sensor beeing
 661          * disposed of, and I'm not 100% certain what best way to deal
 662          * with that except by adding locks all over... I'll do that
 663          * eventually but heh, who ever rmmod this module anyway ?
 664          */
 665         if (sensor_cpu_power)
 666                 wf_put_sensor(sensor_cpu_power);
 667         if (sensor_cpu_temp)
 668                 wf_put_sensor(sensor_cpu_temp);
 669         if (sensor_hd_temp)
 670                 wf_put_sensor(sensor_hd_temp);
 671         if (sensor_slots_power)
 672                 wf_put_sensor(sensor_slots_power);
 673
 674         /* Release all controls */
 675         if (fan_cpu_main)
 676                 wf_put_control(fan_cpu_main);
 677         if (fan_cpu_second)
 678                 wf_put_control(fan_cpu_second);
 679         if (fan_cpu_third)
 680                 wf_put_control(fan_cpu_third);
 681         if (fan_hd)
 682                 wf_put_control(fan_hd);
 683         if (fan_slots)
 684                 wf_put_control(fan_slots);
 685         if (cpufreq_clamp)
 686                 wf_put_control(cpufreq_clamp);
 687
 688         /* Destroy control loops state structures */
 689         kfree(wf_smu_slots_fans);
 690         kfree(wf_smu_drive_fans);
 691         kfree(wf_smu_cpu_fans);
 692
 693         return 0;
 694 }
 695
 696 static struct platform_driver wf_smu_driver = {
 697         .probe = wf_smu_probe,
 698         .remove = __devexit_p(wf_smu_remove),
 699         .driver = {
 700                 .name = "windfarm",
 701                 .owner  = THIS_MODULE,
 702         },
 703 };
 704
 705
 706 static int __init wf_smu_init(void)
 707 {
 708         int rc = -ENODEV;
 709
 710         if (of_machine_is_compatible("PowerMac9,1"))
 711                 rc = wf_init_pm();
 712
 713         if (rc == 0) {
 714 #ifdef MODULE
 715                 request_module("windfarm_smu_controls");
 716                 request_module("windfarm_smu_sensors");
 717                 request_module("windfarm_lm75_sensor");
 718                 request_module("windfarm_cpufreq_clamp");
 719
 720 #endif /* MODULE */
 721                 platform_driver_register(&wf_smu_driver);
 722         }
 723
 724         return rc;
 725 }
 726
 727 static void __exit wf_smu_exit(void)
 728 {
 729
 730         platform_driver_unregister(&wf_smu_driver);
 731 }
 732
 733
 734 module_init(wf_smu_init);
 735 module_exit(wf_smu_exit);
 736
 737 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 738 MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
 739 MODULE_LICENSE("GPL");
 740
 741 MODULE_ALIAS("platform:windfarm");