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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 static struct device *wf_smu_dev;
  67
  68 /* Controls & sensors */
  69 static struct wf_sensor *sensor_cpu_power;
  70 static struct wf_sensor *sensor_cpu_temp;
  71 static struct wf_sensor *sensor_hd_temp;
  72 static struct wf_sensor *sensor_slots_power;
  73 static struct wf_control *fan_cpu_main;
  74 static struct wf_control *fan_cpu_second;
  75 static struct wf_control *fan_cpu_third;
  76 static struct wf_control *fan_hd;
  77 static struct wf_control *fan_slots;
  78 static struct wf_control *cpufreq_clamp;
  79
  80 /* Set to kick the control loop into life */
  81 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
  82
  83 /* Failure handling.. could be nicer */
  84 #define FAILURE_FAN             0x01
  85 #define FAILURE_SENSOR          0x02
  86 #define FAILURE_OVERTEMP        0x04
  87
  88 static unsigned int wf_smu_failure_state;
  89 static int wf_smu_readjust, wf_smu_skipping;
  90
  91 /*
  92  * ****** CPU Fans Control Loop ******
  93  *
  94  */
  95
  96
  97 #define WF_SMU_CPU_FANS_INTERVAL        1
  98 #define WF_SMU_CPU_FANS_MAX_HISTORY     16
  99
 100 /* State data used by the cpu fans control loop
 101  */
 102 struct wf_smu_cpu_fans_state {
 103         int                     ticks;
 104         s32                     cpu_setpoint;
 105         struct wf_cpu_pid_state pid;
 106 };
 107
 108 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
 109
 110
 111
 112 /*
 113  * ****** Drive Fan Control Loop ******
 114  *
 115  */
 116
 117 struct wf_smu_drive_fans_state {
 118         int                     ticks;
 119         s32                     setpoint;
 120         struct wf_pid_state     pid;
 121 };
 122
 123 static struct wf_smu_drive_fans_state *wf_smu_drive_fans;
 124
 125 /*
 126  * ****** Slots Fan Control Loop ******
 127  *
 128  */
 129
 130 struct wf_smu_slots_fans_state {
 131         int                     ticks;
 132         s32                     setpoint;
 133         struct wf_pid_state     pid;
 134 };
 135
 136 static struct wf_smu_slots_fans_state *wf_smu_slots_fans;
 137
 138 /*
 139  * ***** Implementation *****
 140  *
 141  */
 142
 143
 144 static void wf_smu_create_cpu_fans(void)
 145 {
 146         struct wf_cpu_pid_param pid_param;
 147         const struct smu_sdbp_header *hdr;
 148         struct smu_sdbp_cpupiddata *piddata;
 149         struct smu_sdbp_fvt *fvt;
 150         s32 tmax, tdelta, maxpow, powadj;
 151
 152         /* First, locate the PID params in SMU SBD */
 153         hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
 154         if (hdr == 0) {
 155                 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
 156                        "max fan speed\n");
 157                 goto fail;
 158         }
 159         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 160
 161         /* Get the FVT params for operating point 0 (the only supported one
 162          * for now) in order to get tmax
 163          */
 164         hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
 165         if (hdr) {
 166                 fvt = (struct smu_sdbp_fvt *)&hdr[1];
 167                 tmax = ((s32)fvt->maxtemp) << 16;
 168         } else
 169                 tmax = 0x5e0000; /* 94 degree default */
 170
 171         /* Alloc & initialize state */
 172         wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
 173                                   GFP_KERNEL);
 174         if (wf_smu_cpu_fans == NULL)
 175                 goto fail;
 176         wf_smu_cpu_fans->ticks = 1;
 177
 178         /* Fill PID params */
 179         pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
 180         pid_param.history_len = piddata->history_len;
 181         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 182                 printk(KERN_WARNING "windfarm: History size overflow on "
 183                        "CPU control loop (%d)\n", piddata->history_len);
 184                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 185         }
 186         pid_param.gd = piddata->gd;
 187         pid_param.gp = piddata->gp;
 188         pid_param.gr = piddata->gr / pid_param.history_len;
 189
 190         tdelta = ((s32)piddata->target_temp_delta) << 16;
 191         maxpow = ((s32)piddata->max_power) << 16;
 192         powadj = ((s32)piddata->power_adj) << 16;
 193
 194         pid_param.tmax = tmax;
 195         pid_param.ttarget = tmax - tdelta;
 196         pid_param.pmaxadj = maxpow - powadj;
 197
 198         pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
 199         pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);
 200
 201         wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
 202
 203         DBG("wf: CPU Fan control initialized.\n");
 204         DBG("    ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
 205             FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 206             pid_param.min, pid_param.max);
 207
 208         return;
 209
 210  fail:
 211         printk(KERN_WARNING "windfarm: CPU fan config not found\n"
 212                "for this machine model, max fan speed\n");
 213
 214         if (cpufreq_clamp)
 215                 wf_control_set_max(cpufreq_clamp);
 216         if (fan_cpu_main)
 217                 wf_control_set_max(fan_cpu_main);
 218 }
 219
 220 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
 221 {
 222         s32 new_setpoint, temp, power;
 223         int rc;
 224
 225         if (--st->ticks != 0) {
 226                 if (wf_smu_readjust)
 227                         goto readjust;
 228                 return;
 229         }
 230         st->ticks = WF_SMU_CPU_FANS_INTERVAL;
 231
 232         rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
 233         if (rc) {
 234                 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
 235                        rc);
 236                 wf_smu_failure_state |= FAILURE_SENSOR;
 237                 return;
 238         }
 239
 240         rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
 241         if (rc) {
 242                 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
 243                        rc);
 244                 wf_smu_failure_state |= FAILURE_SENSOR;
 245                 return;
 246         }
 247
 248         DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
 249             FIX32TOPRINT(temp), FIX32TOPRINT(power));
 250
 251 #ifdef HACKED_OVERTEMP
 252         if (temp > 0x4a0000)
 253                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 254 #else
 255         if (temp > st->pid.param.tmax)
 256                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 257 #endif
 258         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 259
 260         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
 261
 262         if (st->cpu_setpoint == new_setpoint)
 263                 return;
 264         st->cpu_setpoint = new_setpoint;
 265  readjust:
 266         if (fan_cpu_main && wf_smu_failure_state == 0) {
 267                 rc = fan_cpu_main->ops->set_value(fan_cpu_main,
 268                                                   st->cpu_setpoint);
 269                 if (rc) {
 270                         printk(KERN_WARNING "windfarm: CPU main fan"
 271                                " error %d\n", rc);
 272                         wf_smu_failure_state |= FAILURE_FAN;
 273                 }
 274         }
 275         if (fan_cpu_second && wf_smu_failure_state == 0) {
 276                 rc = fan_cpu_second->ops->set_value(fan_cpu_second,
 277                                                     st->cpu_setpoint);
 278                 if (rc) {
 279                         printk(KERN_WARNING "windfarm: CPU second fan"
 280                                " error %d\n", rc);
 281                         wf_smu_failure_state |= FAILURE_FAN;
 282                 }
 283         }
 284         if (fan_cpu_third && wf_smu_failure_state == 0) {
 285                 rc = fan_cpu_main->ops->set_value(fan_cpu_third,
 286                                                   st->cpu_setpoint);
 287                 if (rc) {
 288                         printk(KERN_WARNING "windfarm: CPU third fan"
 289                                " error %d\n", rc);
 290                         wf_smu_failure_state |= FAILURE_FAN;
 291                 }
 292         }
 293 }
 294
 295 static void wf_smu_create_drive_fans(void)
 296 {
 297         struct wf_pid_param param = {
 298                 .interval       = 5,
 299                 .history_len    = 2,
 300                 .gd             = 0x01e00000,
 301                 .gp             = 0x00500000,
 302                 .gr             = 0x00000000,
 303                 .itarget        = 0x00200000,
 304         };
 305
 306         /* Alloc & initialize state */
 307         wf_smu_drive_fans = kmalloc(sizeof(struct wf_smu_drive_fans_state),
 308                                         GFP_KERNEL);
 309         if (wf_smu_drive_fans == NULL) {
 310                 printk(KERN_WARNING "windfarm: Memory allocation error"
 311                        " max fan speed\n");
 312                 goto fail;
 313         }
 314         wf_smu_drive_fans->ticks = 1;
 315
 316         /* Fill PID params */
 317         param.additive = (fan_hd->type == WF_CONTROL_RPM_FAN);
 318         param.min = fan_hd->ops->get_min(fan_hd);
 319         param.max = fan_hd->ops->get_max(fan_hd);
 320         wf_pid_init(&wf_smu_drive_fans->pid, &param);
 321
 322         DBG("wf: Drive Fan control initialized.\n");
 323         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 324             FIX32TOPRINT(param.itarget), param.min, param.max);
 325         return;
 326
 327  fail:
 328         if (fan_hd)
 329                 wf_control_set_max(fan_hd);
 330 }
 331
 332 static void wf_smu_drive_fans_tick(struct wf_smu_drive_fans_state *st)
 333 {
 334         s32 new_setpoint, temp;
 335         int rc;
 336
 337         if (--st->ticks != 0) {
 338                 if (wf_smu_readjust)
 339                         goto readjust;
 340                 return;
 341         }
 342         st->ticks = st->pid.param.interval;
 343
 344         rc = sensor_hd_temp->ops->get_value(sensor_hd_temp, &temp);
 345         if (rc) {
 346                 printk(KERN_WARNING "windfarm: HD temp sensor error %d\n",
 347                        rc);
 348                 wf_smu_failure_state |= FAILURE_SENSOR;
 349                 return;
 350         }
 351
 352         DBG("wf_smu: Drive Fans tick ! HD temp: %d.%03d\n",
 353             FIX32TOPRINT(temp));
 354
 355         if (temp > (st->pid.param.itarget + 0x50000))
 356                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 357
 358         new_setpoint = wf_pid_run(&st->pid, temp);
 359
 360         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
 361
 362         if (st->setpoint == new_setpoint)
 363                 return;
 364         st->setpoint = new_setpoint;
 365  readjust:
 366         if (fan_hd && wf_smu_failure_state == 0) {
 367                 rc = fan_hd->ops->set_value(fan_hd, st->setpoint);
 368                 if (rc) {
 369                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
 370                                rc);
 371                         wf_smu_failure_state |= FAILURE_FAN;
 372                 }
 373         }
 374 }
 375
 376 static void wf_smu_create_slots_fans(void)
 377 {
 378         struct wf_pid_param param = {
 379                 .interval       = 1,
 380                 .history_len    = 8,
 381                 .gd             = 0x00000000,
 382                 .gp             = 0x00000000,
 383                 .gr             = 0x00020000,
 384                 .itarget        = 0x00000000
 385         };
 386
 387         /* Alloc & initialize state */
 388         wf_smu_slots_fans = kmalloc(sizeof(struct wf_smu_slots_fans_state),
 389                                         GFP_KERNEL);
 390         if (wf_smu_slots_fans == NULL) {
 391                 printk(KERN_WARNING "windfarm: Memory allocation error"
 392                        " max fan speed\n");
 393                 goto fail;
 394         }
 395         wf_smu_slots_fans->ticks = 1;
 396
 397         /* Fill PID params */
 398         param.additive = (fan_slots->type == WF_CONTROL_RPM_FAN);
 399         param.min = fan_slots->ops->get_min(fan_slots);
 400         param.max = fan_slots->ops->get_max(fan_slots);
 401         wf_pid_init(&wf_smu_slots_fans->pid, &param);
 402
 403         DBG("wf: Slots Fan control initialized.\n");
 404         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 405             FIX32TOPRINT(param.itarget), param.min, param.max);
 406         return;
 407
 408  fail:
 409         if (fan_slots)
 410                 wf_control_set_max(fan_slots);
 411 }
 412
 413 static void wf_smu_slots_fans_tick(struct wf_smu_slots_fans_state *st)
 414 {
 415         s32 new_setpoint, power;
 416         int rc;
 417
 418         if (--st->ticks != 0) {
 419                 if (wf_smu_readjust)
 420                         goto readjust;
 421                 return;
 422         }
 423         st->ticks = st->pid.param.interval;
 424
 425         rc = sensor_slots_power->ops->get_value(sensor_slots_power, &power);
 426         if (rc) {
 427                 printk(KERN_WARNING "windfarm: Slots power sensor error %d\n",
 428                        rc);
 429                 wf_smu_failure_state |= FAILURE_SENSOR;
 430                 return;
 431         }
 432
 433         DBG("wf_smu: Slots Fans tick ! Slots power: %d.%03d\n",
 434             FIX32TOPRINT(power));
 435
 436 #if 0 /* Check what makes a good overtemp condition */
 437         if (power > (st->pid.param.itarget + 0x50000))
 438                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 439 #endif
 440
 441         new_setpoint = wf_pid_run(&st->pid, power);
 442
 443         DBG("wf_smu: new_setpoint: %d\n", (int)new_setpoint);
 444
 445         if (st->setpoint == new_setpoint)
 446                 return;
 447         st->setpoint = new_setpoint;
 448  readjust:
 449         if (fan_slots && wf_smu_failure_state == 0) {
 450                 rc = fan_slots->ops->set_value(fan_slots, st->setpoint);
 451                 if (rc) {
 452                         printk(KERN_WARNING "windfarm: Slots fan error %d\n",
 453                                rc);
 454                         wf_smu_failure_state |= FAILURE_FAN;
 455                 }
 456         }
 457 }
 458
 459
 460 /*
 461  * ****** Setup / Init / Misc ... ******
 462  *
 463  */
 464
 465 static void wf_smu_tick(void)
 466 {
 467         unsigned int last_failure = wf_smu_failure_state;
 468         unsigned int new_failure;
 469
 470         if (!wf_smu_started) {
 471                 DBG("wf: creating control loops !\n");
 472                 wf_smu_create_drive_fans();
 473                 wf_smu_create_slots_fans();
 474                 wf_smu_create_cpu_fans();
 475                 wf_smu_started = 1;
 476         }
 477
 478         /* Skipping ticks */
 479         if (wf_smu_skipping && --wf_smu_skipping)
 480                 return;
 481
 482         wf_smu_failure_state = 0;
 483         if (wf_smu_drive_fans)
 484                 wf_smu_drive_fans_tick(wf_smu_drive_fans);
 485         if (wf_smu_slots_fans)
 486                 wf_smu_slots_fans_tick(wf_smu_slots_fans);
 487         if (wf_smu_cpu_fans)
 488                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
 489
 490         wf_smu_readjust = 0;
 491         new_failure = wf_smu_failure_state & ~last_failure;
 492
 493         /* If entering failure mode, clamp cpufreq and ramp all
 494          * fans to full speed.
 495          */
 496         if (wf_smu_failure_state && !last_failure) {
 497                 if (cpufreq_clamp)
 498                         wf_control_set_max(cpufreq_clamp);
 499                 if (fan_cpu_main)
 500                         wf_control_set_max(fan_cpu_main);
 501                 if (fan_cpu_second)
 502                         wf_control_set_max(fan_cpu_second);
 503                 if (fan_cpu_third)
 504                         wf_control_set_max(fan_cpu_third);
 505                 if (fan_hd)
 506                         wf_control_set_max(fan_hd);
 507                 if (fan_slots)
 508                         wf_control_set_max(fan_slots);
 509         }
 510
 511         /* If leaving failure mode, unclamp cpufreq and readjust
 512          * all fans on next iteration
 513          */
 514         if (!wf_smu_failure_state && last_failure) {
 515                 if (cpufreq_clamp)
 516                         wf_control_set_min(cpufreq_clamp);
 517                 wf_smu_readjust = 1;
 518         }
 519
 520         /* Overtemp condition detected, notify and start skipping a couple
 521          * ticks to let the temperature go down
 522          */
 523         if (new_failure & FAILURE_OVERTEMP) {
 524                 wf_set_overtemp();
 525                 wf_smu_skipping = 2;
 526         }
 527
 528         /* We only clear the overtemp condition if overtemp is cleared
 529          * _and_ no other failure is present. Since a sensor error will
 530          * clear the overtemp condition (can't measure temperature) at
 531          * the control loop levels, but we don't want to keep it clear
 532          * here in this case
 533          */
 534         if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
 535                 wf_clear_overtemp();
 536 }
 537
 538
 539 static void wf_smu_new_control(struct wf_control *ct)
 540 {
 541         if (wf_smu_all_controls_ok)
 542                 return;
 543
 544         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-rear-fan-0")) {
 545                 if (wf_get_control(ct) == 0)
 546                         fan_cpu_main = ct;
 547         }
 548
 549         if (fan_cpu_second == NULL && !strcmp(ct->name, "cpu-rear-fan-1")) {
 550                 if (wf_get_control(ct) == 0)
 551                         fan_cpu_second = ct;
 552         }
 553
 554         if (fan_cpu_third == NULL && !strcmp(ct->name, "cpu-front-fan-0")) {
 555                 if (wf_get_control(ct) == 0)
 556                         fan_cpu_third = ct;
 557         }
 558
 559         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
 560                 if (wf_get_control(ct) == 0)
 561                         cpufreq_clamp = ct;
 562         }
 563
 564         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
 565                 if (wf_get_control(ct) == 0)
 566                         fan_hd = ct;
 567         }
 568
 569         if (fan_slots == NULL && !strcmp(ct->name, "slots-fan")) {
 570                 if (wf_get_control(ct) == 0)
 571                         fan_slots = ct;
 572         }
 573
 574         if (fan_cpu_main && (fan_cpu_second || fan_cpu_third) && fan_hd &&
 575             fan_slots && cpufreq_clamp)
 576                 wf_smu_all_controls_ok = 1;
 577 }
 578
 579 static void wf_smu_new_sensor(struct wf_sensor *sr)
 580 {
 581         if (wf_smu_all_sensors_ok)
 582                 return;
 583
 584         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
 585                 if (wf_get_sensor(sr) == 0)
 586                         sensor_cpu_power = sr;
 587         }
 588
 589         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
 590                 if (wf_get_sensor(sr) == 0)
 591                         sensor_cpu_temp = sr;
 592         }
 593
 594         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
 595                 if (wf_get_sensor(sr) == 0)
 596                         sensor_hd_temp = sr;
 597         }
 598
 599         if (sensor_slots_power == NULL && !strcmp(sr->name, "slots-power")) {
 600                 if (wf_get_sensor(sr) == 0)
 601                         sensor_slots_power = sr;
 602         }
 603
 604         if (sensor_cpu_power && sensor_cpu_temp &&
 605             sensor_hd_temp && sensor_slots_power)
 606                 wf_smu_all_sensors_ok = 1;
 607 }
 608
 609
 610 static int wf_smu_notify(struct notifier_block *self,
 611                                unsigned long event, void *data)
 612 {
 613         switch(event) {
 614         case WF_EVENT_NEW_CONTROL:
 615                 DBG("wf: new control %s detected\n",
 616                     ((struct wf_control *)data)->name);
 617                 wf_smu_new_control(data);
 618                 wf_smu_readjust = 1;
 619                 break;
 620         case WF_EVENT_NEW_SENSOR:
 621                 DBG("wf: new sensor %s detected\n",
 622                     ((struct wf_sensor *)data)->name);
 623                 wf_smu_new_sensor(data);
 624                 break;
 625         case WF_EVENT_TICK:
 626                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
 627                         wf_smu_tick();
 628         }
 629
 630         return 0;
 631 }
 632
 633 static struct notifier_block wf_smu_events = {
 634         .notifier_call  = wf_smu_notify,
 635 };
 636
 637 static int wf_init_pm(void)
 638 {
 639         printk(KERN_INFO "windfarm: Initializing for Desktop G5 model\n");
 640
 641         return 0;
 642 }
 643
 644 static int wf_smu_probe(struct device *ddev)
 645 {
 646         wf_smu_dev = ddev;
 647
 648         wf_register_client(&wf_smu_events);
 649
 650         return 0;
 651 }
 652
 653 static int wf_smu_remove(struct device *ddev)
 654 {
 655         wf_unregister_client(&wf_smu_events);
 656
 657         /* XXX We don't have yet a guarantee that our callback isn't
 658          * in progress when returning from wf_unregister_client, so
 659          * we add an arbitrary delay. I'll have to fix that in the core
 660          */
 661         msleep(1000);
 662
 663         /* Release all sensors */
 664         /* One more crappy race: I don't think we have any guarantee here
 665          * that the attribute callback won't race with the sensor beeing
 666          * disposed of, and I'm not 100% certain what best way to deal
 667          * with that except by adding locks all over... I'll do that
 668          * eventually but heh, who ever rmmod this module anyway ?
 669          */
 670         if (sensor_cpu_power)
 671                 wf_put_sensor(sensor_cpu_power);
 672         if (sensor_cpu_temp)
 673                 wf_put_sensor(sensor_cpu_temp);
 674         if (sensor_hd_temp)
 675                 wf_put_sensor(sensor_hd_temp);
 676         if (sensor_slots_power)
 677                 wf_put_sensor(sensor_slots_power);
 678
 679         /* Release all controls */
 680         if (fan_cpu_main)
 681                 wf_put_control(fan_cpu_main);
 682         if (fan_cpu_second)
 683                 wf_put_control(fan_cpu_second);
 684         if (fan_cpu_third)
 685                 wf_put_control(fan_cpu_third);
 686         if (fan_hd)
 687                 wf_put_control(fan_hd);
 688         if (fan_slots)
 689                 wf_put_control(fan_slots);
 690         if (cpufreq_clamp)
 691                 wf_put_control(cpufreq_clamp);
 692
 693         /* Destroy control loops state structures */
 694         if (wf_smu_slots_fans)
 695                 kfree(wf_smu_cpu_fans);
 696         if (wf_smu_drive_fans)
 697                 kfree(wf_smu_cpu_fans);
 698         if (wf_smu_cpu_fans)
 699                 kfree(wf_smu_cpu_fans);
 700
 701         wf_smu_dev = NULL;
 702
 703         return 0;
 704 }
 705
 706 static struct device_driver wf_smu_driver = {
 707         .name = "windfarm",
 708         .bus = &platform_bus_type,
 709         .probe = wf_smu_probe,
 710         .remove = wf_smu_remove,
 711 };
 712
 713
 714 static int __init wf_smu_init(void)
 715 {
 716         int rc = -ENODEV;
 717
 718         if (machine_is_compatible("PowerMac9,1"))
 719                 rc = wf_init_pm();
 720
 721         if (rc == 0) {
 722 #ifdef MODULE
 723                 request_module("windfarm_smu_controls");
 724                 request_module("windfarm_smu_sensors");
 725                 request_module("windfarm_lm75_sensor");
 726
 727 #endif /* MODULE */
 728                 driver_register(&wf_smu_driver);
 729         }
 730
 731         return rc;
 732 }
 733
 734 static void __exit wf_smu_exit(void)
 735 {
 736
 737         driver_unregister(&wf_smu_driver);
 738 }
 739
 740
 741 module_init(wf_smu_init);
 742 module_exit(wf_smu_exit);
 743
 744 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 745 MODULE_DESCRIPTION("Thermal control logic for PowerMac9,1");
 746 MODULE_LICENSE("GPL");
 747