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   1 /*
   2  * Windfarm PowerMac thermal control. iMac G5
   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  * PowerMac8,1 and PowerMac8,2
  17  * ===========================
  18  *
  19  * System Fans control loop. Different based on models. In addition to the
  20  * usual PID algorithm, the control loop gets 2 additional pairs of linear
  21  * scaling factors (scale/offsets) expressed as 4.12 fixed point values
  22  * signed offset, unsigned scale)
  23  *
  24  * The targets are modified such as:
  25  *  - the linked control (second control) gets the target value as-is
  26  *    (typically the drive fan)
  27  *  - the main control (first control) gets the target value scaled with
  28  *    the first pair of factors, and is then modified as below
  29  *  - the value of the target of the CPU Fan control loop is retrieved,
  30  *    scaled with the second pair of factors, and the max of that and
  31  *    the scaled target is applied to the main control.
  32  *
  33  * # model_id: 2
  34  *   controls       : system-fan, drive-bay-fan
  35  *   sensors        : hd-temp
  36  *   PID params     : G_d = 0x15400000
  37  *                    G_p = 0x00200000
  38  *                    G_r = 0x000002fd
  39  *                    History = 2 entries
  40  *                    Input target = 0x3a0000
  41  *                    Interval = 5s
  42  *   linear-factors : offset = 0xff38 scale  = 0x0ccd
  43  *                    offset = 0x0208 scale  = 0x07ae
  44  *
  45  * # model_id: 3
  46  *   controls       : system-fan, drive-bay-fan
  47  *   sensors        : hd-temp
  48  *   PID params     : G_d = 0x08e00000
  49  *                    G_p = 0x00566666
  50  *                    G_r = 0x0000072b
  51  *                    History = 2 entries
  52  *                    Input target = 0x350000
  53  *                    Interval = 5s
  54  *   linear-factors : offset = 0xff38 scale  = 0x0ccd
  55  *                    offset = 0x0000 scale  = 0x0000
  56  *
  57  * # model_id: 5
  58  *   controls       : system-fan
  59  *   sensors        : hd-temp
  60  *   PID params     : G_d = 0x15400000
  61  *                    G_p = 0x00233333
  62  *                    G_r = 0x000002fd
  63  *                    History = 2 entries
  64  *                    Input target = 0x3a0000
  65  *                    Interval = 5s
  66  *   linear-factors : offset = 0x0000 scale  = 0x1000
  67  *                    offset = 0x0091 scale  = 0x0bae
  68  *
  69  * CPU Fan control loop. The loop is identical for all models. it
  70  * has an additional pair of scaling factor. This is used to scale the
  71  * systems fan control loop target result (the one before it gets scaled
  72  * by the System Fans control loop itself). Then, the max value of the
  73  * calculated target value and system fan value is sent to the fans
  74  *
  75  *   controls       : cpu-fan
  76  *   sensors        : cpu-temp cpu-power
  77  *   PID params     : From SMU sdb partition
  78  *   linear-factors : offset = 0xfb50 scale  = 0x1000
  79  *
  80  * CPU Slew control loop. Not implemented. The cpufreq driver in linux is
  81  * completely separate for now, though we could find a way to link it, either
  82  * as a client reacting to overtemp notifications, or directling monitoring
  83  * the CPU temperature
  84  *
  85  * WARNING ! The CPU control loop requires the CPU tmax for the current
  86  * operating point. However, we currently are completely separated from
  87  * the cpufreq driver and thus do not know what the current operating
  88  * point is. Fortunately, we also do not have any hardware supporting anything
  89  * but operating point 0 at the moment, thus we just peek that value directly
  90  * from the SDB partition. If we ever end up with actually slewing the system
  91  * clock and thus changing operating points, we'll have to find a way to
  92  * communicate with the CPU freq driver;
  93  *
  94  */
  95
  96 #include <linux/types.h>
  97 #include <linux/errno.h>
  98 #include <linux/kernel.h>
  99 #include <linux/delay.h>
 100 #include <linux/slab.h>
 101 #include <linux/init.h>
 102 #include <linux/spinlock.h>
 103 #include <linux/wait.h>
 104 #include <linux/kmod.h>
 105 #include <linux/device.h>
 106 #include <linux/platform_device.h>
 107 #include <asm/prom.h>
 108 #include <asm/machdep.h>
 109 #include <asm/io.h>
 110 #include <asm/system.h>
 111 #include <asm/sections.h>
 112 #include <asm/smu.h>
 113
 114 #include "windfarm.h"
 115 #include "windfarm_pid.h"
 116
 117 #define VERSION "0.4"
 118
 119 #undef DEBUG
 120
 121 #ifdef DEBUG
 122 #define DBG(args...)    printk(args)
 123 #else
 124 #define DBG(args...)    do { } while(0)
 125 #endif
 126
 127 /* define this to force CPU overtemp to 74 degree, useful for testing
 128  * the overtemp code
 129  */
 130 #undef HACKED_OVERTEMP
 131
 132 static int wf_smu_mach_model;   /* machine model id */
 133
 134 /* Controls & sensors */
 135 static struct wf_sensor *sensor_cpu_power;
 136 static struct wf_sensor *sensor_cpu_temp;
 137 static struct wf_sensor *sensor_hd_temp;
 138 static struct wf_control *fan_cpu_main;
 139 static struct wf_control *fan_hd;
 140 static struct wf_control *fan_system;
 141 static struct wf_control *cpufreq_clamp;
 142
 143 /* Set to kick the control loop into life */
 144 static int wf_smu_all_controls_ok, wf_smu_all_sensors_ok, wf_smu_started;
 145
 146 /* Failure handling.. could be nicer */
 147 #define FAILURE_FAN             0x01
 148 #define FAILURE_SENSOR          0x02
 149 #define FAILURE_OVERTEMP        0x04
 150
 151 static unsigned int wf_smu_failure_state;
 152 static int wf_smu_readjust, wf_smu_skipping;
 153
 154 /*
 155  * ****** System Fans Control Loop ******
 156  *
 157  */
 158
 159 /* Parameters for the System Fans control loop. Parameters
 160  * not in this table such as interval, history size, ...
 161  * are common to all versions and thus hard coded for now.
 162  */
 163 struct wf_smu_sys_fans_param {
 164         int     model_id;
 165         s32     itarget;
 166         s32     gd, gp, gr;
 167
 168         s16     offset0;
 169         u16     scale0;
 170         s16     offset1;
 171         u16     scale1;
 172 };
 173
 174 #define WF_SMU_SYS_FANS_INTERVAL        5
 175 #define WF_SMU_SYS_FANS_HISTORY_SIZE    2
 176
 177 /* State data used by the system fans control loop
 178  */
 179 struct wf_smu_sys_fans_state {
 180         int                     ticks;
 181         s32                     sys_setpoint;
 182         s32                     hd_setpoint;
 183         s16                     offset0;
 184         u16                     scale0;
 185         s16                     offset1;
 186         u16                     scale1;
 187         struct wf_pid_state     pid;
 188 };
 189
 190 /*
 191  * Configs for SMU Sytem Fan control loop
 192  */
 193 static struct wf_smu_sys_fans_param wf_smu_sys_all_params[] = {
 194         /* Model ID 2 */
 195         {
 196                 .model_id       = 2,
 197                 .itarget        = 0x3a0000,
 198                 .gd             = 0x15400000,
 199                 .gp             = 0x00200000,
 200                 .gr             = 0x000002fd,
 201                 .offset0        = 0xff38,
 202                 .scale0         = 0x0ccd,
 203                 .offset1        = 0x0208,
 204                 .scale1         = 0x07ae,
 205         },
 206         /* Model ID 3 */
 207         {
 208                 .model_id       = 3,
 209                 .itarget        = 0x350000,
 210                 .gd             = 0x08e00000,
 211                 .gp             = 0x00566666,
 212                 .gr             = 0x0000072b,
 213                 .offset0        = 0xff38,
 214                 .scale0         = 0x0ccd,
 215                 .offset1        = 0x0000,
 216                 .scale1         = 0x0000,
 217         },
 218         /* Model ID 5 */
 219         {
 220                 .model_id       = 5,
 221                 .itarget        = 0x3a0000,
 222                 .gd             = 0x15400000,
 223                 .gp             = 0x00233333,
 224                 .gr             = 0x000002fd,
 225                 .offset0        = 0x0000,
 226                 .scale0         = 0x1000,
 227                 .offset1        = 0x0091,
 228                 .scale1         = 0x0bae,
 229         },
 230 };
 231 #define WF_SMU_SYS_FANS_NUM_CONFIGS ARRAY_SIZE(wf_smu_sys_all_params)
 232
 233 static struct wf_smu_sys_fans_state *wf_smu_sys_fans;
 234
 235 /*
 236  * ****** CPU Fans Control Loop ******
 237  *
 238  */
 239
 240
 241 #define WF_SMU_CPU_FANS_INTERVAL        1
 242 #define WF_SMU_CPU_FANS_MAX_HISTORY     16
 243 #define WF_SMU_CPU_FANS_SIBLING_SCALE   0x00001000
 244 #define WF_SMU_CPU_FANS_SIBLING_OFFSET  0xfffffb50
 245
 246 /* State data used by the cpu fans control loop
 247  */
 248 struct wf_smu_cpu_fans_state {
 249         int                     ticks;
 250         s32                     cpu_setpoint;
 251         s32                     scale;
 252         s32                     offset;
 253         struct wf_cpu_pid_state pid;
 254 };
 255
 256 static struct wf_smu_cpu_fans_state *wf_smu_cpu_fans;
 257
 258
 259
 260 /*
 261  * ***** Implementation *****
 262  *
 263  */
 264
 265 static void wf_smu_create_sys_fans(void)
 266 {
 267         struct wf_smu_sys_fans_param *param = NULL;
 268         struct wf_pid_param pid_param;
 269         int i;
 270
 271         /* First, locate the params for this model */
 272         for (i = 0; i < WF_SMU_SYS_FANS_NUM_CONFIGS; i++)
 273                 if (wf_smu_sys_all_params[i].model_id == wf_smu_mach_model) {
 274                         param = &wf_smu_sys_all_params[i];
 275                         break;
 276                 }
 277
 278         /* No params found, put fans to max */
 279         if (param == NULL) {
 280                 printk(KERN_WARNING "windfarm: System fan config not found "
 281                        "for this machine model, max fan speed\n");
 282                 goto fail;
 283         }
 284
 285         /* Alloc & initialize state */
 286         wf_smu_sys_fans = kmalloc(sizeof(struct wf_smu_sys_fans_state),
 287                                   GFP_KERNEL);
 288         if (wf_smu_sys_fans == NULL) {
 289                 printk(KERN_WARNING "windfarm: Memory allocation error"
 290                        " max fan speed\n");
 291                 goto fail;
 292         }
 293         wf_smu_sys_fans->ticks = 1;
 294         wf_smu_sys_fans->scale0 = param->scale0;
 295         wf_smu_sys_fans->offset0 = param->offset0;
 296         wf_smu_sys_fans->scale1 = param->scale1;
 297         wf_smu_sys_fans->offset1 = param->offset1;
 298
 299         /* Fill PID params */
 300         pid_param.gd = param->gd;
 301         pid_param.gp = param->gp;
 302         pid_param.gr = param->gr;
 303         pid_param.interval = WF_SMU_SYS_FANS_INTERVAL;
 304         pid_param.history_len = WF_SMU_SYS_FANS_HISTORY_SIZE;
 305         pid_param.itarget = param->itarget;
 306         pid_param.min = fan_system->ops->get_min(fan_system);
 307         pid_param.max = fan_system->ops->get_max(fan_system);
 308         if (fan_hd) {
 309                 pid_param.min =
 310                         max(pid_param.min,fan_hd->ops->get_min(fan_hd));
 311                 pid_param.max =
 312                         min(pid_param.max,fan_hd->ops->get_max(fan_hd));
 313         }
 314         wf_pid_init(&wf_smu_sys_fans->pid, &pid_param);
 315
 316         DBG("wf: System Fan control initialized.\n");
 317         DBG("    itarged=%d.%03d, min=%d RPM, max=%d RPM\n",
 318             FIX32TOPRINT(pid_param.itarget), pid_param.min, pid_param.max);
 319         return;
 320
 321  fail:
 322
 323         if (fan_system)
 324                 wf_control_set_max(fan_system);
 325         if (fan_hd)
 326                 wf_control_set_max(fan_hd);
 327 }
 328
 329 static void wf_smu_sys_fans_tick(struct wf_smu_sys_fans_state *st)
 330 {
 331         s32 new_setpoint, temp, scaled, cputarget;
 332         int rc;
 333
 334         if (--st->ticks != 0) {
 335                 if (wf_smu_readjust)
 336                         goto readjust;
 337                 return;
 338         }
 339         st->ticks = WF_SMU_SYS_FANS_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: System 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 RPM\n", (int)new_setpoint);
 358
 359         scaled = ((((s64)new_setpoint) * (s64)st->scale0) >> 12) + st->offset0;
 360
 361         DBG("wf_smu: scaled setpoint: %d RPM\n", (int)scaled);
 362
 363         cputarget = wf_smu_cpu_fans ? wf_smu_cpu_fans->pid.target : 0;
 364         cputarget = ((((s64)cputarget) * (s64)st->scale1) >> 12) + st->offset1;
 365         scaled = max(scaled, cputarget);
 366         scaled = max(scaled, st->pid.param.min);
 367         scaled = min(scaled, st->pid.param.max);
 368
 369         DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)scaled);
 370
 371         if (st->sys_setpoint == scaled && new_setpoint == st->hd_setpoint)
 372                 return;
 373         st->sys_setpoint = scaled;
 374         st->hd_setpoint = new_setpoint;
 375  readjust:
 376         if (fan_system && wf_smu_failure_state == 0) {
 377                 rc = fan_system->ops->set_value(fan_system, st->sys_setpoint);
 378                 if (rc) {
 379                         printk(KERN_WARNING "windfarm: Sys fan error %d\n",
 380                                rc);
 381                         wf_smu_failure_state |= FAILURE_FAN;
 382                 }
 383         }
 384         if (fan_hd && wf_smu_failure_state == 0) {
 385                 rc = fan_hd->ops->set_value(fan_hd, st->hd_setpoint);
 386                 if (rc) {
 387                         printk(KERN_WARNING "windfarm: HD fan error %d\n",
 388                                rc);
 389                         wf_smu_failure_state |= FAILURE_FAN;
 390                 }
 391         }
 392 }
 393
 394 static void wf_smu_create_cpu_fans(void)
 395 {
 396         struct wf_cpu_pid_param pid_param;
 397         const struct smu_sdbp_header *hdr;
 398         struct smu_sdbp_cpupiddata *piddata;
 399         struct smu_sdbp_fvt *fvt;
 400         s32 tmax, tdelta, maxpow, powadj;
 401
 402         /* First, locate the PID params in SMU SBD */
 403         hdr = smu_get_sdb_partition(SMU_SDB_CPUPIDDATA_ID, NULL);
 404         if (hdr == 0) {
 405                 printk(KERN_WARNING "windfarm: CPU PID fan config not found "
 406                        "max fan speed\n");
 407                 goto fail;
 408         }
 409         piddata = (struct smu_sdbp_cpupiddata *)&hdr[1];
 410
 411         /* Get the FVT params for operating point 0 (the only supported one
 412          * for now) in order to get tmax
 413          */
 414         hdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL);
 415         if (hdr) {
 416                 fvt = (struct smu_sdbp_fvt *)&hdr[1];
 417                 tmax = ((s32)fvt->maxtemp) << 16;
 418         } else
 419                 tmax = 0x5e0000; /* 94 degree default */
 420
 421         /* Alloc & initialize state */
 422         wf_smu_cpu_fans = kmalloc(sizeof(struct wf_smu_cpu_fans_state),
 423                                   GFP_KERNEL);
 424         if (wf_smu_cpu_fans == NULL)
 425                 goto fail;
 426         wf_smu_cpu_fans->ticks = 1;
 427
 428         wf_smu_cpu_fans->scale = WF_SMU_CPU_FANS_SIBLING_SCALE;
 429         wf_smu_cpu_fans->offset = WF_SMU_CPU_FANS_SIBLING_OFFSET;
 430
 431         /* Fill PID params */
 432         pid_param.interval = WF_SMU_CPU_FANS_INTERVAL;
 433         pid_param.history_len = piddata->history_len;
 434         if (pid_param.history_len > WF_CPU_PID_MAX_HISTORY) {
 435                 printk(KERN_WARNING "windfarm: History size overflow on "
 436                        "CPU control loop (%d)\n", piddata->history_len);
 437                 pid_param.history_len = WF_CPU_PID_MAX_HISTORY;
 438         }
 439         pid_param.gd = piddata->gd;
 440         pid_param.gp = piddata->gp;
 441         pid_param.gr = piddata->gr / pid_param.history_len;
 442
 443         tdelta = ((s32)piddata->target_temp_delta) << 16;
 444         maxpow = ((s32)piddata->max_power) << 16;
 445         powadj = ((s32)piddata->power_adj) << 16;
 446
 447         pid_param.tmax = tmax;
 448         pid_param.ttarget = tmax - tdelta;
 449         pid_param.pmaxadj = maxpow - powadj;
 450
 451         pid_param.min = fan_cpu_main->ops->get_min(fan_cpu_main);
 452         pid_param.max = fan_cpu_main->ops->get_max(fan_cpu_main);
 453
 454         wf_cpu_pid_init(&wf_smu_cpu_fans->pid, &pid_param);
 455
 456         DBG("wf: CPU Fan control initialized.\n");
 457         DBG("    ttarged=%d.%03d, tmax=%d.%03d, min=%d RPM, max=%d RPM\n",
 458             FIX32TOPRINT(pid_param.ttarget), FIX32TOPRINT(pid_param.tmax),
 459             pid_param.min, pid_param.max);
 460
 461         return;
 462
 463  fail:
 464         printk(KERN_WARNING "windfarm: CPU fan config not found\n"
 465                "for this machine model, max fan speed\n");
 466
 467         if (cpufreq_clamp)
 468                 wf_control_set_max(cpufreq_clamp);
 469         if (fan_cpu_main)
 470                 wf_control_set_max(fan_cpu_main);
 471 }
 472
 473 static void wf_smu_cpu_fans_tick(struct wf_smu_cpu_fans_state *st)
 474 {
 475         s32 new_setpoint, temp, power, systarget;
 476         int rc;
 477
 478         if (--st->ticks != 0) {
 479                 if (wf_smu_readjust)
 480                         goto readjust;
 481                 return;
 482         }
 483         st->ticks = WF_SMU_CPU_FANS_INTERVAL;
 484
 485         rc = sensor_cpu_temp->ops->get_value(sensor_cpu_temp, &temp);
 486         if (rc) {
 487                 printk(KERN_WARNING "windfarm: CPU temp sensor error %d\n",
 488                        rc);
 489                 wf_smu_failure_state |= FAILURE_SENSOR;
 490                 return;
 491         }
 492
 493         rc = sensor_cpu_power->ops->get_value(sensor_cpu_power, &power);
 494         if (rc) {
 495                 printk(KERN_WARNING "windfarm: CPU power sensor error %d\n",
 496                        rc);
 497                 wf_smu_failure_state |= FAILURE_SENSOR;
 498                 return;
 499         }
 500
 501         DBG("wf_smu: CPU Fans tick ! CPU temp: %d.%03d, power: %d.%03d\n",
 502             FIX32TOPRINT(temp), FIX32TOPRINT(power));
 503
 504 #ifdef HACKED_OVERTEMP
 505         if (temp > 0x4a0000)
 506                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 507 #else
 508         if (temp > st->pid.param.tmax)
 509                 wf_smu_failure_state |= FAILURE_OVERTEMP;
 510 #endif
 511         new_setpoint = wf_cpu_pid_run(&st->pid, power, temp);
 512
 513         DBG("wf_smu: new_setpoint: %d RPM\n", (int)new_setpoint);
 514
 515         systarget = wf_smu_sys_fans ? wf_smu_sys_fans->pid.target : 0;
 516         systarget = ((((s64)systarget) * (s64)st->scale) >> 12)
 517                 + st->offset;
 518         new_setpoint = max(new_setpoint, systarget);
 519         new_setpoint = max(new_setpoint, st->pid.param.min);
 520         new_setpoint = min(new_setpoint, st->pid.param.max);
 521
 522         DBG("wf_smu: adjusted setpoint: %d RPM\n", (int)new_setpoint);
 523
 524         if (st->cpu_setpoint == new_setpoint)
 525                 return;
 526         st->cpu_setpoint = new_setpoint;
 527  readjust:
 528         if (fan_cpu_main && wf_smu_failure_state == 0) {
 529                 rc = fan_cpu_main->ops->set_value(fan_cpu_main,
 530                                                   st->cpu_setpoint);
 531                 if (rc) {
 532                         printk(KERN_WARNING "windfarm: CPU main fan"
 533                                " error %d\n", rc);
 534                         wf_smu_failure_state |= FAILURE_FAN;
 535                 }
 536         }
 537 }
 538
 539 /*
 540  * ****** Setup / Init / Misc ... ******
 541  *
 542  */
 543
 544 static void wf_smu_tick(void)
 545 {
 546         unsigned int last_failure = wf_smu_failure_state;
 547         unsigned int new_failure;
 548
 549         if (!wf_smu_started) {
 550                 DBG("wf: creating control loops !\n");
 551                 wf_smu_create_sys_fans();
 552                 wf_smu_create_cpu_fans();
 553                 wf_smu_started = 1;
 554         }
 555
 556         /* Skipping ticks */
 557         if (wf_smu_skipping && --wf_smu_skipping)
 558                 return;
 559
 560         wf_smu_failure_state = 0;
 561         if (wf_smu_sys_fans)
 562                 wf_smu_sys_fans_tick(wf_smu_sys_fans);
 563         if (wf_smu_cpu_fans)
 564                 wf_smu_cpu_fans_tick(wf_smu_cpu_fans);
 565
 566         wf_smu_readjust = 0;
 567         new_failure = wf_smu_failure_state & ~last_failure;
 568
 569         /* If entering failure mode, clamp cpufreq and ramp all
 570          * fans to full speed.
 571          */
 572         if (wf_smu_failure_state && !last_failure) {
 573                 if (cpufreq_clamp)
 574                         wf_control_set_max(cpufreq_clamp);
 575                 if (fan_system)
 576                         wf_control_set_max(fan_system);
 577                 if (fan_cpu_main)
 578                         wf_control_set_max(fan_cpu_main);
 579                 if (fan_hd)
 580                         wf_control_set_max(fan_hd);
 581         }
 582
 583         /* If leaving failure mode, unclamp cpufreq and readjust
 584          * all fans on next iteration
 585          */
 586         if (!wf_smu_failure_state && last_failure) {
 587                 if (cpufreq_clamp)
 588                         wf_control_set_min(cpufreq_clamp);
 589                 wf_smu_readjust = 1;
 590         }
 591
 592         /* Overtemp condition detected, notify and start skipping a couple
 593          * ticks to let the temperature go down
 594          */
 595         if (new_failure & FAILURE_OVERTEMP) {
 596                 wf_set_overtemp();
 597                 wf_smu_skipping = 2;
 598         }
 599
 600         /* We only clear the overtemp condition if overtemp is cleared
 601          * _and_ no other failure is present. Since a sensor error will
 602          * clear the overtemp condition (can't measure temperature) at
 603          * the control loop levels, but we don't want to keep it clear
 604          * here in this case
 605          */
 606         if (new_failure == 0 && last_failure & FAILURE_OVERTEMP)
 607                 wf_clear_overtemp();
 608 }
 609
 610 static void wf_smu_new_control(struct wf_control *ct)
 611 {
 612         if (wf_smu_all_controls_ok)
 613                 return;
 614
 615         if (fan_cpu_main == NULL && !strcmp(ct->name, "cpu-fan")) {
 616                 if (wf_get_control(ct) == 0)
 617                         fan_cpu_main = ct;
 618         }
 619
 620         if (fan_system == NULL && !strcmp(ct->name, "system-fan")) {
 621                 if (wf_get_control(ct) == 0)
 622                         fan_system = ct;
 623         }
 624
 625         if (cpufreq_clamp == NULL && !strcmp(ct->name, "cpufreq-clamp")) {
 626                 if (wf_get_control(ct) == 0)
 627                         cpufreq_clamp = ct;
 628         }
 629
 630         /* Darwin property list says the HD fan is only for model ID
 631          * 0, 1, 2 and 3
 632          */
 633
 634         if (wf_smu_mach_model > 3) {
 635                 if (fan_system && fan_cpu_main && cpufreq_clamp)
 636                         wf_smu_all_controls_ok = 1;
 637                 return;
 638         }
 639
 640         if (fan_hd == NULL && !strcmp(ct->name, "drive-bay-fan")) {
 641                 if (wf_get_control(ct) == 0)
 642                         fan_hd = ct;
 643         }
 644
 645         if (fan_system && fan_hd && fan_cpu_main && cpufreq_clamp)
 646                 wf_smu_all_controls_ok = 1;
 647 }
 648
 649 static void wf_smu_new_sensor(struct wf_sensor *sr)
 650 {
 651         if (wf_smu_all_sensors_ok)
 652                 return;
 653
 654         if (sensor_cpu_power == NULL && !strcmp(sr->name, "cpu-power")) {
 655                 if (wf_get_sensor(sr) == 0)
 656                         sensor_cpu_power = sr;
 657         }
 658
 659         if (sensor_cpu_temp == NULL && !strcmp(sr->name, "cpu-temp")) {
 660                 if (wf_get_sensor(sr) == 0)
 661                         sensor_cpu_temp = sr;
 662         }
 663
 664         if (sensor_hd_temp == NULL && !strcmp(sr->name, "hd-temp")) {
 665                 if (wf_get_sensor(sr) == 0)
 666                         sensor_hd_temp = sr;
 667         }
 668
 669         if (sensor_cpu_power && sensor_cpu_temp && sensor_hd_temp)
 670                 wf_smu_all_sensors_ok = 1;
 671 }
 672
 673
 674 static int wf_smu_notify(struct notifier_block *self,
 675                                unsigned long event, void *data)
 676 {
 677         switch(event) {
 678         case WF_EVENT_NEW_CONTROL:
 679                 DBG("wf: new control %s detected\n",
 680                     ((struct wf_control *)data)->name);
 681                 wf_smu_new_control(data);
 682                 wf_smu_readjust = 1;
 683                 break;
 684         case WF_EVENT_NEW_SENSOR:
 685                 DBG("wf: new sensor %s detected\n",
 686                     ((struct wf_sensor *)data)->name);
 687                 wf_smu_new_sensor(data);
 688                 break;
 689         case WF_EVENT_TICK:
 690                 if (wf_smu_all_controls_ok && wf_smu_all_sensors_ok)
 691                         wf_smu_tick();
 692         }
 693
 694         return 0;
 695 }
 696
 697 static struct notifier_block wf_smu_events = {
 698         .notifier_call  = wf_smu_notify,
 699 };
 700
 701 static int wf_init_pm(void)
 702 {
 703         const struct smu_sdbp_header *hdr;
 704
 705         hdr = smu_get_sdb_partition(SMU_SDB_SENSORTREE_ID, NULL);
 706         if (hdr != 0) {
 707                 struct smu_sdbp_sensortree *st =
 708                         (struct smu_sdbp_sensortree *)&hdr[1];
 709                 wf_smu_mach_model = st->model_id;
 710         }
 711
 712         printk(KERN_INFO "windfarm: Initializing for iMacG5 model ID %d\n",
 713                wf_smu_mach_model);
 714
 715         return 0;
 716 }
 717
 718 static int wf_smu_probe(struct platform_device *ddev)
 719 {
 720         wf_register_client(&wf_smu_events);
 721
 722         return 0;
 723 }
 724
 725 static int __devexit wf_smu_remove(struct platform_device *ddev)
 726 {
 727         wf_unregister_client(&wf_smu_events);
 728
 729         /* XXX We don't have yet a guarantee that our callback isn't
 730          * in progress when returning from wf_unregister_client, so
 731          * we add an arbitrary delay. I'll have to fix that in the core
 732          */
 733         msleep(1000);
 734
 735         /* Release all sensors */
 736         /* One more crappy race: I don't think we have any guarantee here
 737          * that the attribute callback won't race with the sensor beeing
 738          * disposed of, and I'm not 100% certain what best way to deal
 739          * with that except by adding locks all over... I'll do that
 740          * eventually but heh, who ever rmmod this module anyway ?
 741          */
 742         if (sensor_cpu_power)
 743                 wf_put_sensor(sensor_cpu_power);
 744         if (sensor_cpu_temp)
 745                 wf_put_sensor(sensor_cpu_temp);
 746         if (sensor_hd_temp)
 747                 wf_put_sensor(sensor_hd_temp);
 748
 749         /* Release all controls */
 750         if (fan_cpu_main)
 751                 wf_put_control(fan_cpu_main);
 752         if (fan_hd)
 753                 wf_put_control(fan_hd);
 754         if (fan_system)
 755                 wf_put_control(fan_system);
 756         if (cpufreq_clamp)
 757                 wf_put_control(cpufreq_clamp);
 758
 759         /* Destroy control loops state structures */
 760         if (wf_smu_sys_fans)
 761                 kfree(wf_smu_sys_fans);
 762         if (wf_smu_cpu_fans)
 763                 kfree(wf_smu_cpu_fans);
 764
 765         return 0;
 766 }
 767
 768 static struct platform_driver wf_smu_driver = {
 769         .probe = wf_smu_probe,
 770         .remove = __devexit_p(wf_smu_remove),
 771         .driver = {
 772                 .name = "windfarm",
 773                 .bus = &platform_bus_type,
 774         },
 775 };
 776
 777
 778 static int __init wf_smu_init(void)
 779 {
 780         int rc = -ENODEV;
 781
 782         if (machine_is_compatible("PowerMac8,1") ||
 783             machine_is_compatible("PowerMac8,2"))
 784                 rc = wf_init_pm();
 785
 786         if (rc == 0) {
 787 #ifdef MODULE
 788                 request_module("windfarm_smu_controls");
 789                 request_module("windfarm_smu_sensors");
 790                 request_module("windfarm_lm75_sensor");
 791                 request_module("windfarm_cpufreq_clamp");
 792
 793 #endif /* MODULE */
 794                 platform_driver_register(&wf_smu_driver);
 795         }
 796
 797         return rc;
 798 }
 799
 800 static void __exit wf_smu_exit(void)
 801 {
 802
 803         platform_driver_unregister(&wf_smu_driver);
 804 }
 805
 806
 807 module_init(wf_smu_init);
 808 module_exit(wf_smu_exit);
 809
 810 MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
 811 MODULE_DESCRIPTION("Thermal control logic for iMac G5");
 812 MODULE_LICENSE("GPL");
 813