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 = wf_control_get_min(fan_cpu_main);
 196         pid_param.max = wf_control_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 = wf_sensor_get(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 = wf_sensor_get(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 = wf_control_set(fan_cpu_main, st->cpu_setpoint);
 265                 if (rc) {
 266                         printk(KERN_WARNING "windfarm: CPU main fan"
 267                                " error %d\n", rc);
 268                         wf_smu_failure_state |= FAILURE_FAN;
 269                 }
 270         }
 271         if (fan_cpu_second && wf_smu_failure_state == 0) {
 272                 rc = wf_control_set(fan_cpu_second, st->cpu_setpoint);
 273                 if (rc) {
 274                         printk(KERN_WARNING "windfarm: CPU second fan"
 275                                " error %d\n", rc);
 276                         wf_smu_failure_state |= FAILURE_FAN;
 277                 }
 278         }
 279         if (fan_cpu_third && wf_smu_failure_state == 0) {
 280                 rc = wf_control_set(fan_cpu_third, st->cpu_setpoint);
 281                 if (rc) {
 282                         printk(KERN_WARNING "windfarm: CPU third fan"
 283                                " error %d\n", rc);
 284                         wf_smu_failure_state |= FAILURE_FAN;
 285                 }
 286         }
 287 }
 288
 289 static void wf_smu_create_drive_fans(void)
 290 {
 291         struct wf_pid_param param = {
 292                 .interval       = 5,
 293                 .history_len    = 2,
 294                 .gd             = 0x01e00000,
 295                 .gp             = 0x00500000,
 296                 .gr             = 0x00000000,
 297                 .itarget        = 0x00200000,
 298         };
 299
 300         /* Alloc & initialize state */
 301         wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
 302                                         GFP_KERNEL);
 303         if (wf_smu_drive_fans == NULL) {
 304                 printk(KERN_WARNING "windfarm: Memory allocation error"
 305                        " max fan speed\n");
 306                 goto fail;
 307         }
 308         wf_smu_drive_fans->ticks = 1;
 309
 310         /* Fill PID params */
 311         param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
 312         param.min = wf_control_get_min(fan_hd);
 313         param.max = wf_control_get_max(fan_hd);
 314         wf_pid_init(&wf_smu_drive_fans->pid, &param);
 315
 316         DBG("wf: Drive Fan control initialized.\n");
 317         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 318             FIX32TOPRINT(param.itarget), param.min, param.max);
 319         return;
 320
 321  fail:
 322         if (fan_hd)
 323                 wf_control_set_max(fan_hd);
 324 }
 325
 326 static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
 327 {
 328         s32 new_setpoint, temp;
 329         int rc;
 330
 331         if (--st->ticks != 0) {
 332                 if (wf_smu_readjust)
 333                         goto readjust;
 334                 return;
 335         }
 336         st->ticks = st->pid.param.interval;
 337
 338         rc = wf_sensor_get(sensor_hd_temp, &temp);
 339         if (rc) {
 340                 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
 341                        rc);
 342                 wf_smu_failure_state |= FAILURE_SENSOR;
 343                 return;
 344         }
 345
 346         DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
 347             FIX32TOPRINT(temp));
 348
 349         if (temp > (st->pid.param.itarget + 0x50000))
 350                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 351
 352         new_setpoint = wf_pid_run(&st->pid, temp);
 353
 354         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
 355
 356         if (st->setpoint == new_setpoint)
 357                 return;
 358         st->setpoint = new_setpoint;
 359  readjust:
 360         if (fan_hd && wf_smu_failure_state == 0) {
 361                 rc = wf_control_set(fan_hd, st->setpoint);
 362                 if (rc) {
 363                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
 364                                rc);
 365                         wf_smu_failure_state |= FAILURE_FAN;
 366                 }
 367         }
 368 }
 369
 370 static void wf_smu_create_slots_fans(void)
 371 {
 372         struct wf_pid_param param = {
 373                 .interval       = 1,
 374                 .history_len    = 8,
 375                 .gd             = 0x00000000,
 376                 .gp             = 0x00000000,
 377                 .gr             = 0x00020000,
 378                 .itarget        = 0x00000000
 379         };
 380
 381         /* Alloc & initialize state */
 382         wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
 383                                         GFP_KERNEL);
 384         if (wf_smu_slots_fans == NULL) {
 385                 printk(KERN_WARNING "windfarm: Memory allocation error"
 386                        " max fan speed\n");
 387                 goto fail;
 388         }
 389         wf_smu_slots_fans->ticks = 1;
 390
 391         /* Fill PID params */
 392         param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
 393         param.min = wf_control_get_min(fan_slots);
 394         param.max = wf_control_get_max(fan_slots);
 395         wf_pid_init(&wf_smu_slots_fans->pid, &param);
 396
 397         DBG("wf: Slots Fan control initialized.\n");
 398         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 399             FIX32TOPRINT(param.itarget), param.min, param.max);
 400         return;
 401
 402  fail:
 403         if (fan_slots)
 404                 wf_control_set_max(fan_slots);
 405 }
 406
 407 static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
 408 {
 409         s32 new_setpoint, power;
 410         int rc;
 411
 412         if (--st->ticks != 0) {
 413                 if (wf_smu_readjust)
 414                         goto readjust;
 415                 return;
 416         }
 417         st->ticks = st->pid.param.interval;
 418
 419         rc = wf_sensor_get(sensor_slots_power, &power);
 420         if (rc) {
 421                 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
 422                        rc);
 423                 wf_smu_failure_state |= FAILURE_SENSOR;
 424                 return;
 425         }
 426
 427         DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
 428             FIX32TOPRINT(power));
 429
 430 #if 0 /* Check what makes a good overtemp condition */
 431         if (power > (st->pid.param.itarget + 0x50000))
 432                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 433 #endif
 434
 435         new_setpoint = wf_pid_run(&st->pid, power);
 436
 437         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
 438
 439         if (st->setpoint == new_setpoint)
 440                 return;
 441         st->setpoint = new_setpoint;
 442  readjust:
 443         if (fan_slots && wf_smu_failure_state == 0) {
 444                 rc = wf_control_set(fan_slots, st->setpoint);
 445                 if (rc) {
 446                         printk(KERN_WARNING "windfarm: Slots fan error %d\n",
 447                                rc);
 448                         wf_smu_failure_state |= FAILURE_FAN;
 449                 }
 450         }
 451 }
 452
 453
 454 /*
 455  * ****** Setup / Init / Misc ... ******
 456  *
 457  */
 458
 459 static void wf_smu_tick(void)
 460 {
 461         unsigned int last_failure = wf_smu_failure_state;
 462         unsigned int new_failure;
 463
 464         if (!wf_smu_started) {
 465                 DBG("wf: creating control loops !\n");
 466                 wf_smu_create_drive_fans();
 467                 wf_smu_create_slots_fans();
 468                 wf_smu_create_cpu_fans();
 469                 wf_smu_started = 1;
 470         }
 471
 472         /* Skipping ticks */
 473         if (wf_smu_skipping && --wf_smu_skipping)
 474                 return;
 475
 476         wf_smu_failure_state = 0;
 477         if (wf_smu_drive_fans)
 478                 wf_smu_drive_fans_tick(wf_smu_drive_fans);
 479         if (wf_smu_slots_fans)
 480                 wf_smu_slots_fans_tick(wf_smu_slots_fans);
 481         if (wf_smu_cpu_fans)
 482                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
 483
 484         wf_smu_readjust = 0;
 485         new_failure = wf_smu_failure_state & ~last_failure;
 486
 487         /* If entering failure mode, clamp cpufreq and ramp all
 488          * fans to full speed.
 489          */
 490         if (wf_smu_failure_state && !last_failure) {
 491                 if (cpufreq_clamp)
 492                         wf_control_set_max(cpufreq_clamp);
 493                 if (fan_cpu_main)
 494                         wf_control_set_max(fan_cpu_main);
 495                 if (fan_cpu_second)
 496                         wf_control_set_max(fan_cpu_second);
 497                 if (fan_cpu_third)
 498                         wf_control_set_max(fan_cpu_third);
 499                 if (fan_hd)
 500                         wf_control_set_max(fan_hd);
 501                 if (fan_slots)
 502                         wf_control_set_max(fan_slots);
 503         }
 504
 505         /* If leaving failure mode, unclamp cpufreq and readjust
 506          * all fans on next iteration
 507          */
 508         if (!wf_smu_failure_state && last_failure) {
 509                 if (cpufreq_clamp)
 510                         wf_control_set_min(cpufreq_clamp);
 511                 wf_smu_readjust = 1;
 512         }
 513
 514         /* Overtemp condition detected, notify and start skipping a couple
 515          * ticks to let the temperature go down
 516          */
 517         if (new_failure & FAILURE_OVERTEMP) {
 518                 wf_set_overtemp();
 519                 wf_smu_skipping = 2;
 520         }
 521
 522         /* We only clear the overtemp condition if overtemp is cleared
 523          * _and_ no other failure is present. Since a sensor error will
 524          * clear the overtemp condition (can't measure temperature) at
 525          * the control loop levels, but we don't want to keep it clear
 526          * here in this case
 527          */
 528         if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
 529                 wf_clear_overtemp();
 530 }
 531
 532
 533 static void wf_smu_new_control(struct wf_control *ct)
 534 {
 535         if (wf_smu_all_controls_ok)
 536                 return;
 537
 538         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
 539                 if (wf_get_control(ct) == 0)
 540                         fan_cpu_main = ct;
 541         }
 542
 543         if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
 544                 if (wf_get_control(ct) == 0)
 545                         fan_cpu_second = ct;
 546         }
 547
 548         if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
 549                 if (wf_get_control(ct) == 0)
 550                         fan_cpu_third = ct;
 551         }
 552
 553         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
 554                 if (wf_get_control(ct) == 0)
 555                         cpufreq_clamp = ct;
 556         }
 557
 558         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
 559                 if (wf_get_control(ct) == 0)
 560                         fan_hd = ct;
 561         }
 562
 563         if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
 564                 if (wf_get_control(ct) == 0)
 565                         fan_slots = ct;
 566         }
 567
 568         if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
 569             fan_slots && cpufreq_clamp)
 570                 wf_smu_all_controls_ok = 1;
 571 }
 572
 573 static void wf_smu_new_sensor(struct wf_sensor *sr)
 574 {
 575         if (wf_smu_all_sensors_ok)
 576                 return;
 577
 578         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
 579                 if (wf_get_sensor(sr) == 0)
 580                         sensor_cpu_power = sr;
 581         }
 582
 583         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
 584                 if (wf_get_sensor(sr) == 0)
 585                         sensor_cpu_temp = sr;
 586         }
 587
 588         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
 589                 if (wf_get_sensor(sr) == 0)
 590                         sensor_hd_temp = sr;
 591         }
 592
 593         if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
 594                 if (wf_get_sensor(sr) == 0)
 595                         sensor_slots_power = sr;
 596         }
 597
 598         if (sensor_cpu_power && sensor_cpu_temp &&
 599             sensor_hd_temp && sensor_slots_power)
 600                 wf_smu_all_sensors_ok = 1;
 601 }
 602
 603
 604 static int wf_smu_notify(struct notifier_block *self,
 605                                unsigned long event, void *data)
 606 {
 607         switch(event) {
 608         case WF_EVENT_NEW_CONTROL:
 609                 DBG("wf: new control %s detected\n",
 610                     ((struct wf_control *)data)->name);
 611                 wf_smu_new_control(data);
 612                 wf_smu_readjust = 1;
 613                 break;
 614         case WF_EVENT_NEW_SENSOR:
 615                 DBG("wf: new sensor %s detected\n",
 616                     ((struct wf_sensor *)data)->name);
 617                 wf_smu_new_sensor(data);
 618                 break;
 619         case WF_EVENT_TICK:
 620                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
 621                         wf_smu_tick();
 622         }
 623
 624         return 0;
 625 }
 626
 627 static struct notifier_block wf_smu_events = {
 628         .notifier_call  = wf_smu_notify,
 629 };
 630
 631 static int wf_init_pm(void)
 632 {
 633         printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
 634
 635         return 0;
 636 }
 637
 638 static int wf_smu_probe(struct platform_device *ddev)
 639 {
 640         wf_register_client(&wf_smu_events);
 641
 642         return 0;
 643 }
 644
 645 static int __devexit wf_smu_remove(struct platform_device *ddev)
 646 {
 647         wf_unregister_client(&wf_smu_events);
 648
 649         /* XXX We don't have yet a guarantee that our callback isn't
 650          * in progress when returning from wf_unregister_client, so
 651          * we add an arbitrary delay. I'll have to fix that in the core
 652          */
 653         msleep(1000);
 654
 655         /* Release all sensors */
 656         /* One more crappy race: I don't think we have any guarantee here
 657          * that the attribute callback won't race with the sensor beeing
 658          * disposed of, and I'm not 100% certain what best way to deal
 659          * with that except by adding locks all over... I'll do that
 660          * eventually but heh, who ever rmmod this module anyway ?
 661          */
 662         if (sensor_cpu_power)
 663                 wf_put_sensor(sensor_cpu_power);
 664         if (sensor_cpu_temp)
 665                 wf_put_sensor(sensor_cpu_temp);
 666         if (sensor_hd_temp)
 667                 wf_put_sensor(sensor_hd_temp);
 668         if (sensor_slots_power)
 669                 wf_put_sensor(sensor_slots_power);
 670
 671         /* Release all controls */
 672         if (fan_cpu_main)
 673                 wf_put_control(fan_cpu_main);
 674         if (fan_cpu_second)
 675                 wf_put_control(fan_cpu_second);
 676         if (fan_cpu_third)
 677                 wf_put_control(fan_cpu_third);
 678         if (fan_hd)
 679                 wf_put_control(fan_hd);
 680         if (fan_slots)
 681                 wf_put_control(fan_slots);
 682         if (cpufreq_clamp)
 683                 wf_put_control(cpufreq_clamp);
 684
 685         /* Destroy control loops state structures */
 686         kfree(wf_smu_slots_fans);
 687         kfree(wf_smu_drive_fans);
 688         kfree(wf_smu_cpu_fans);
 689
 690         return 0;
 691 }
 692
 693 static struct platform_driver wf_smu_driver = {
 694         .probe = wf_smu_probe,
 695         .remove = __devexit_p(wf_smu_remove),
 696         .driver = {
 697                 .name = "windfarm",
 698                 .owner  = THIS_MODULE,
 699         },
 700 };
 701
 702
 703 static int __init wf_smu_init(void)
 704 {
 705         int rc = -ENODEV;
 706
 707         if (of_machine_is_compatible("PowerMac9,1"))
 708                 rc = wf_init_pm();
 709
 710         if (rc == 0) {
 711 #ifdef MODULE
 712                 request_module("windfarm_smu_controls");
 713                 request_module("windfarm_smu_sensors");
 714                 request_module("windfarm_lm75_sensor");
 715                 request_module("windfarm_cpufreq_clamp");
 716
 717 #endif /* MODULE */
 718                 platform_driver_register(&wf_smu_driver);
 719         }
 720
 721         return rc;
 722 }
 723
 724 static void __exit wf_smu_exit(void)
 725 {
 726
 727         platform_driver_unregister(&wf_smu_driver);
 728 }
 729
 730
 731 module_init(wf_smu_init);
 732 module_exit(wf_smu_exit);
 733
 734 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 735 MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
 736 MODULE_LICENSE("GPL");
 737
 738 MODULE_ALIAS("platform:windfarm");