drivers/gpu/drm/nouveau/nouveau_pm.c

   1 /*
   2  * Copyright 2010 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24
  25 #include "drmP.h"
  26
  27 #include "nouveau_drv.h"
  28 #include "nouveau_pm.h"
  29 #include "nouveau_gpio.h"
  30
  31 #ifdef CONFIG_ACPI
  32 #include <linux/acpi.h>
  33 #endif
  34 #include <linux/power_supply.h>
  35 #include <linux/hwmon.h>
  36 #include <linux/hwmon-sysfs.h>
  37
  38 static int
  39 nouveau_pwmfan_get(struct drm_device *dev)
  40 {
  41         struct drm_nouveau_private *dev_priv = dev->dev_private;
  42         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
  43         struct gpio_func gpio;
  44         u32 divs, duty;
  45         int ret;
  46
  47         if (!pm->pwm_get)
  48                 return -ENODEV;
  49
  50         ret = nouveau_gpio_find(dev, 0, DCB_GPIO_PWM_FAN, 0xff, &gpio);
  51         if (ret == 0) {
  52                 ret = pm->pwm_get(dev, gpio.line, &divs, &duty);
  53                 if (ret == 0) {
  54                         divs = max(divs, duty);
  55                         if (dev_priv->card_type <= NV_40 || (gpio.log[0] & 1))
  56                                 duty = divs - duty;
  57                         return (duty * 100) / divs;
  58                 }
  59
  60                 return nouveau_gpio_func_get(dev, gpio.func) * 100;
  61         }
  62
  63         return -ENODEV;
  64 }
  65
  66 static int
  67 nouveau_pwmfan_set(struct drm_device *dev, int percent)
  68 {
  69         struct drm_nouveau_private *dev_priv = dev->dev_private;
  70         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
  71         struct gpio_func gpio;
  72         u32 divs, duty;
  73         int ret;
  74
  75         if (!pm->pwm_set)
  76                 return -ENODEV;
  77
  78         ret = nouveau_gpio_find(dev, 0, DCB_GPIO_PWM_FAN, 0xff, &gpio);
  79         if (ret == 0) {
  80                 divs = pm->pwm_divisor;
  81                 if (pm->fan.pwm_freq) {
  82                         /*XXX: PNVIO clock more than likely... */
  83                         divs = 135000 / pm->fan.pwm_freq;
  84                         if (dev_priv->chipset < 0xa3)
  85                                 divs /= 4;
  86                 }
  87
  88                 duty = ((divs * percent) + 99) / 100;
  89                 if (dev_priv->card_type <= NV_40 || (gpio.log[0] & 1))
  90                         duty = divs - duty;
  91
  92                 return pm->pwm_set(dev, gpio.line, divs, duty);
  93         }
  94
  95         return -ENODEV;
  96 }
  97
  98 static int
  99 nouveau_pm_perflvl_aux(struct drm_device *dev, struct nouveau_pm_level *perflvl,
 100                        struct nouveau_pm_level *a, struct nouveau_pm_level *b)
 101 {
 102         struct drm_nouveau_private *dev_priv = dev->dev_private;
 103         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 104         int ret;
 105
 106         /*XXX: not on all boards, we should control based on temperature
 107          *     on recent boards..  or maybe on some other factor we don't
 108          *     know about?
 109          */
 110         if (a->fanspeed && b->fanspeed && b->fanspeed > a->fanspeed) {
 111                 ret = nouveau_pwmfan_set(dev, perflvl->fanspeed);
 112                 if (ret && ret != -ENODEV) {
 113                         NV_ERROR(dev, "fanspeed set failed: %d\n", ret);
 114                         return ret;
 115                 }
 116         }
 117
 118         if (pm->voltage.supported && pm->voltage_set) {
 119                 if (perflvl->volt_min && b->volt_min > a->volt_min) {
 120                         ret = pm->voltage_set(dev, perflvl->volt_min);
 121                         if (ret) {
 122                                 NV_ERROR(dev, "voltage set failed: %d\n", ret);
 123                                 return ret;
 124                         }
 125                 }
 126         }
 127
 128         return 0;
 129 }
 130
 131 static int
 132 nouveau_pm_perflvl_set(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 133 {
 134         struct drm_nouveau_private *dev_priv = dev->dev_private;
 135         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 136         void *state;
 137         int ret;
 138
 139         if (perflvl == pm->cur)
 140                 return 0;
 141
 142         ret = nouveau_pm_perflvl_aux(dev, perflvl, pm->cur, perflvl);
 143         if (ret)
 144                 return ret;
 145
 146         state = pm->clocks_pre(dev, perflvl);
 147         if (IS_ERR(state))
 148                 return PTR_ERR(state);
 149         pm->clocks_set(dev, state);
 150
 151         ret = nouveau_pm_perflvl_aux(dev, perflvl, perflvl, pm->cur);
 152         if (ret)
 153                 return ret;
 154
 155         pm->cur = perflvl;
 156         return 0;
 157 }
 158
 159 static int
 160 nouveau_pm_profile_set(struct drm_device *dev, const char *profile)
 161 {
 162         struct drm_nouveau_private *dev_priv = dev->dev_private;
 163         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 164         struct nouveau_pm_level *perflvl = NULL;
 165         long pl;
 166
 167         /* safety precaution, for now */
 168         if (nouveau_perflvl_wr != 7777)
 169                 return -EPERM;
 170
 171         if (!strncmp(profile, "boot", 4))
 172                 perflvl = &pm->boot;
 173         else {
 174                 int i;
 175                 if (kstrtol(profile, 10, &pl) == -EINVAL)
 176                         return -EINVAL;
 177
 178                 for (i = 0; i < pm->nr_perflvl; i++) {
 179                         if (pm->perflvl[i].id == pl) {
 180                                 perflvl = &pm->perflvl[i];
 181                                 break;
 182                         }
 183                 }
 184
 185                 if (!perflvl)
 186                         return -EINVAL;
 187         }
 188
 189         NV_INFO(dev, "setting performance level: %s\n", profile);
 190         return nouveau_pm_perflvl_set(dev, perflvl);
 191 }
 192
 193 static int
 194 nouveau_pm_perflvl_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
 195 {
 196         struct drm_nouveau_private *dev_priv = dev->dev_private;
 197         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 198         int ret;
 199
 200         memset(perflvl, 0, sizeof(*perflvl));
 201
 202         ret = pm->clocks_get(dev, perflvl);
 203         if (ret)
 204                 return ret;
 205
 206         if (pm->voltage.supported && pm->voltage_get) {
 207                 ret = pm->voltage_get(dev);
 208                 if (ret > 0) {
 209                         perflvl->volt_min = ret;
 210                         perflvl->volt_max = ret;
 211                 }
 212         }
 213
 214         ret = nouveau_pwmfan_get(dev);
 215         if (ret > 0)
 216                 perflvl->fanspeed = ret;
 217
 218         return 0;
 219 }
 220
 221 static void
 222 nouveau_pm_perflvl_info(struct nouveau_pm_level *perflvl, char *ptr, int len)
 223 {
 224         char c[16], s[16], v[32], f[16], t[16], m[16];
 225
 226         c[0] = '\0';
 227         if (perflvl->core)
 228                 snprintf(c, sizeof(c), " core %dMHz", perflvl->core / 1000);
 229
 230         s[0] = '\0';
 231         if (perflvl->shader)
 232                 snprintf(s, sizeof(s), " shader %dMHz", perflvl->shader / 1000);
 233
 234         m[0] = '\0';
 235         if (perflvl->memory)
 236                 snprintf(m, sizeof(m), " memory %dMHz", perflvl->memory / 1000);
 237
 238         v[0] = '\0';
 239         if (perflvl->volt_min && perflvl->volt_min != perflvl->volt_max) {
 240                 snprintf(v, sizeof(v), " voltage %dmV-%dmV",
 241                          perflvl->volt_min / 1000, perflvl->volt_max / 1000);
 242         } else
 243         if (perflvl->volt_min) {
 244                 snprintf(v, sizeof(v), " voltage %dmV",
 245                          perflvl->volt_min / 1000);
 246         }
 247
 248         f[0] = '\0';
 249         if (perflvl->fanspeed)
 250                 snprintf(f, sizeof(f), " fanspeed %d%%", perflvl->fanspeed);
 251
 252         t[0] = '\0';
 253         if (perflvl->timing)
 254                 snprintf(t, sizeof(t), " timing %d", perflvl->timing->id);
 255
 256         snprintf(ptr, len, "%s%s%s%s%s%s\n", c, s, m, t, v, f);
 257 }
 258
 259 static ssize_t
 260 nouveau_pm_get_perflvl_info(struct device *d,
 261                             struct device_attribute *a, char *buf)
 262 {
 263         struct nouveau_pm_level *perflvl = (struct nouveau_pm_level *)a;
 264         char *ptr = buf;
 265         int len = PAGE_SIZE;
 266
 267         snprintf(ptr, len, "%d:", perflvl->id);
 268         ptr += strlen(buf);
 269         len -= strlen(buf);
 270
 271         nouveau_pm_perflvl_info(perflvl, ptr, len);
 272         return strlen(buf);
 273 }
 274
 275 static ssize_t
 276 nouveau_pm_get_perflvl(struct device *d, struct device_attribute *a, char *buf)
 277 {
 278         struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
 279         struct drm_nouveau_private *dev_priv = dev->dev_private;
 280         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 281         struct nouveau_pm_level cur;
 282         int len = PAGE_SIZE, ret;
 283         char *ptr = buf;
 284
 285         if (!pm->cur)
 286                 snprintf(ptr, len, "setting: boot\n");
 287         else if (pm->cur == &pm->boot)
 288                 snprintf(ptr, len, "setting: boot\nc:");
 289         else
 290                 snprintf(ptr, len, "setting: static %d\nc:", pm->cur->id);
 291         ptr += strlen(buf);
 292         len -= strlen(buf);
 293
 294         ret = nouveau_pm_perflvl_get(dev, &cur);
 295         if (ret == 0)
 296                 nouveau_pm_perflvl_info(&cur, ptr, len);
 297         return strlen(buf);
 298 }
 299
 300 static ssize_t
 301 nouveau_pm_set_perflvl(struct device *d, struct device_attribute *a,
 302                        const char *buf, size_t count)
 303 {
 304         struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
 305         int ret;
 306
 307         ret = nouveau_pm_profile_set(dev, buf);
 308         if (ret)
 309                 return ret;
 310         return strlen(buf);
 311 }
 312
 313 static DEVICE_ATTR(performance_level, S_IRUGO | S_IWUSR,
 314                    nouveau_pm_get_perflvl, nouveau_pm_set_perflvl);
 315
 316 static int
 317 nouveau_sysfs_init(struct drm_device *dev)
 318 {
 319         struct drm_nouveau_private *dev_priv = dev->dev_private;
 320         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 321         struct device *d = &dev->pdev->dev;
 322         int ret, i;
 323
 324         ret = device_create_file(d, &dev_attr_performance_level);
 325         if (ret)
 326                 return ret;
 327
 328         for (i = 0; i < pm->nr_perflvl; i++) {
 329                 struct nouveau_pm_level *perflvl = &pm->perflvl[i];
 330
 331                 perflvl->dev_attr.attr.name = perflvl->name;
 332                 perflvl->dev_attr.attr.mode = S_IRUGO;
 333                 perflvl->dev_attr.show = nouveau_pm_get_perflvl_info;
 334                 perflvl->dev_attr.store = NULL;
 335                 sysfs_attr_init(&perflvl->dev_attr.attr);
 336
 337                 ret = device_create_file(d, &perflvl->dev_attr);
 338                 if (ret) {
 339                         NV_ERROR(dev, "failed pervlvl %d sysfs: %d\n",
 340                                  perflvl->id, i);
 341                         perflvl->dev_attr.attr.name = NULL;
 342                         nouveau_pm_fini(dev);
 343                         return ret;
 344                 }
 345         }
 346
 347         return 0;
 348 }
 349
 350 static void
 351 nouveau_sysfs_fini(struct drm_device *dev)
 352 {
 353         struct drm_nouveau_private *dev_priv = dev->dev_private;
 354         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 355         struct device *d = &dev->pdev->dev;
 356         int i;
 357
 358         device_remove_file(d, &dev_attr_performance_level);
 359         for (i = 0; i < pm->nr_perflvl; i++) {
 360                 struct nouveau_pm_level *pl = &pm->perflvl[i];
 361
 362                 if (!pl->dev_attr.attr.name)
 363                         break;
 364
 365                 device_remove_file(d, &pl->dev_attr);
 366         }
 367 }
 368
 369 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
 370 static ssize_t
 371 nouveau_hwmon_show_temp(struct device *d, struct device_attribute *a, char *buf)
 372 {
 373         struct drm_device *dev = dev_get_drvdata(d);
 374         struct drm_nouveau_private *dev_priv = dev->dev_private;
 375         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 376
 377         return snprintf(buf, PAGE_SIZE, "%d\n", pm->temp_get(dev)*1000);
 378 }
 379 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, nouveau_hwmon_show_temp,
 380                                                   NULL, 0);
 381
 382 static ssize_t
 383 nouveau_hwmon_max_temp(struct device *d, struct device_attribute *a, char *buf)
 384 {
 385         struct drm_device *dev = dev_get_drvdata(d);
 386         struct drm_nouveau_private *dev_priv = dev->dev_private;
 387         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 388         struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
 389
 390         return snprintf(buf, PAGE_SIZE, "%d\n", temp->down_clock*1000);
 391 }
 392 static ssize_t
 393 nouveau_hwmon_set_max_temp(struct device *d, struct device_attribute *a,
 394                                                 const char *buf, size_t count)
 395 {
 396         struct drm_device *dev = dev_get_drvdata(d);
 397         struct drm_nouveau_private *dev_priv = dev->dev_private;
 398         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 399         struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
 400         long value;
 401
 402         if (kstrtol(buf, 10, &value) == -EINVAL)
 403                 return count;
 404
 405         temp->down_clock = value/1000;
 406
 407         nouveau_temp_safety_checks(dev);
 408
 409         return count;
 410 }
 411 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, nouveau_hwmon_max_temp,
 412                                                   nouveau_hwmon_set_max_temp,
 413                                                   0);
 414
 415 static ssize_t
 416 nouveau_hwmon_critical_temp(struct device *d, struct device_attribute *a,
 417                                                         char *buf)
 418 {
 419         struct drm_device *dev = dev_get_drvdata(d);
 420         struct drm_nouveau_private *dev_priv = dev->dev_private;
 421         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 422         struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
 423
 424         return snprintf(buf, PAGE_SIZE, "%d\n", temp->critical*1000);
 425 }
 426 static ssize_t
 427 nouveau_hwmon_set_critical_temp(struct device *d, struct device_attribute *a,
 428                                                             const char *buf,
 429                                                                 size_t count)
 430 {
 431         struct drm_device *dev = dev_get_drvdata(d);
 432         struct drm_nouveau_private *dev_priv = dev->dev_private;
 433         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 434         struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
 435         long value;
 436
 437         if (kstrtol(buf, 10, &value) == -EINVAL)
 438                 return count;
 439
 440         temp->critical = value/1000;
 441
 442         nouveau_temp_safety_checks(dev);
 443
 444         return count;
 445 }
 446 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
 447                                                 nouveau_hwmon_critical_temp,
 448                                                 nouveau_hwmon_set_critical_temp,
 449                                                 0);
 450
 451 static ssize_t nouveau_hwmon_show_name(struct device *dev,
 452                                       struct device_attribute *attr,
 453                                       char *buf)
 454 {
 455         return sprintf(buf, "nouveau\n");
 456 }
 457 static SENSOR_DEVICE_ATTR(name, S_IRUGO, nouveau_hwmon_show_name, NULL, 0);
 458
 459 static ssize_t nouveau_hwmon_show_update_rate(struct device *dev,
 460                                       struct device_attribute *attr,
 461                                       char *buf)
 462 {
 463         return sprintf(buf, "1000\n");
 464 }
 465 static SENSOR_DEVICE_ATTR(update_rate, S_IRUGO,
 466                                                 nouveau_hwmon_show_update_rate,
 467                                                 NULL, 0);
 468
 469 static ssize_t
 470 nouveau_hwmon_show_fan0_input(struct device *d, struct device_attribute *attr,
 471                               char *buf)
 472 {
 473         struct drm_device *dev = dev_get_drvdata(d);
 474         struct drm_nouveau_private *dev_priv = dev->dev_private;
 475         struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
 476         struct gpio_func gpio;
 477         u32 cycles, cur, prev;
 478         u64 start;
 479         int ret;
 480
 481         ret = nouveau_gpio_find(dev, 0, DCB_GPIO_FAN_SENSE, 0xff, &gpio);
 482         if (ret)
 483                 return ret;
 484
 485         /* Monitor the GPIO input 0x3b for 250ms.
 486          * When the fan spins, it changes the value of GPIO FAN_SENSE.
 487          * We get 4 changes (0 -> 1 -> 0 -> 1 -> [...]) per complete rotation.
 488          */
 489         start = ptimer->read(dev);
 490         prev = nouveau_gpio_sense(dev, 0, gpio.line);
 491         cycles = 0;
 492         do {
 493                 cur = nouveau_gpio_sense(dev, 0, gpio.line);
 494                 if (prev != cur) {
 495                         cycles++;
 496                         prev = cur;
 497                 }
 498
 499                 usleep_range(500, 1000); /* supports 0 < rpm < 7500 */
 500         } while (ptimer->read(dev) - start < 250000000);
 501
 502         /* interpolate to get rpm */
 503         return sprintf(buf, "%i\n", cycles / 4 * 4 * 60);
 504 }
 505 static SENSOR_DEVICE_ATTR(fan0_input, S_IRUGO, nouveau_hwmon_show_fan0_input,
 506                           NULL, 0);
 507
 508 static ssize_t
 509 nouveau_hwmon_get_pwm0(struct device *d, struct device_attribute *a, char *buf)
 510 {
 511         struct drm_device *dev = dev_get_drvdata(d);
 512         int ret;
 513
 514         ret = nouveau_pwmfan_get(dev);
 515         if (ret < 0)
 516                 return ret;
 517
 518         return sprintf(buf, "%i\n", ret);
 519 }
 520
 521 static ssize_t
 522 nouveau_hwmon_set_pwm0(struct device *d, struct device_attribute *a,
 523                        const char *buf, size_t count)
 524 {
 525         struct drm_device *dev = dev_get_drvdata(d);
 526         struct drm_nouveau_private *dev_priv = dev->dev_private;
 527         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 528         int ret = -ENODEV;
 529         long value;
 530
 531         if (nouveau_perflvl_wr != 7777)
 532                 return -EPERM;
 533
 534         if (kstrtol(buf, 10, &value) == -EINVAL)
 535                 return -EINVAL;
 536
 537         if (value < pm->fan.min_duty)
 538                 value = pm->fan.min_duty;
 539         if (value > pm->fan.max_duty)
 540                 value = pm->fan.max_duty;
 541
 542         ret = nouveau_pwmfan_set(dev, value);
 543         if (ret)
 544                 return ret;
 545
 546         return count;
 547 }
 548
 549 static SENSOR_DEVICE_ATTR(pwm0, S_IRUGO | S_IWUSR,
 550                           nouveau_hwmon_get_pwm0,
 551                           nouveau_hwmon_set_pwm0, 0);
 552
 553 static ssize_t
 554 nouveau_hwmon_get_pwm0_min(struct device *d,
 555                            struct device_attribute *a, char *buf)
 556 {
 557         struct drm_device *dev = dev_get_drvdata(d);
 558         struct drm_nouveau_private *dev_priv = dev->dev_private;
 559         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 560
 561         return sprintf(buf, "%i\n", pm->fan.min_duty);
 562 }
 563
 564 static ssize_t
 565 nouveau_hwmon_set_pwm0_min(struct device *d, struct device_attribute *a,
 566                            const char *buf, size_t count)
 567 {
 568         struct drm_device *dev = dev_get_drvdata(d);
 569         struct drm_nouveau_private *dev_priv = dev->dev_private;
 570         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 571         long value;
 572
 573         if (kstrtol(buf, 10, &value) == -EINVAL)
 574                 return -EINVAL;
 575
 576         if (value < 0)
 577                 value = 0;
 578
 579         if (pm->fan.max_duty - value < 10)
 580                 value = pm->fan.max_duty - 10;
 581
 582         if (value < 10)
 583                 pm->fan.min_duty = 10;
 584         else
 585                 pm->fan.min_duty = value;
 586
 587         return count;
 588 }
 589
 590 static SENSOR_DEVICE_ATTR(pwm0_min, S_IRUGO | S_IWUSR,
 591                           nouveau_hwmon_get_pwm0_min,
 592                           nouveau_hwmon_set_pwm0_min, 0);
 593
 594 static ssize_t
 595 nouveau_hwmon_get_pwm0_max(struct device *d,
 596                            struct device_attribute *a, char *buf)
 597 {
 598         struct drm_device *dev = dev_get_drvdata(d);
 599         struct drm_nouveau_private *dev_priv = dev->dev_private;
 600         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 601
 602         return sprintf(buf, "%i\n", pm->fan.max_duty);
 603 }
 604
 605 static ssize_t
 606 nouveau_hwmon_set_pwm0_max(struct device *d, struct device_attribute *a,
 607                            const char *buf, size_t count)
 608 {
 609         struct drm_device *dev = dev_get_drvdata(d);
 610         struct drm_nouveau_private *dev_priv = dev->dev_private;
 611         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 612         long value;
 613
 614         if (kstrtol(buf, 10, &value) == -EINVAL)
 615                 return -EINVAL;
 616
 617         if (value < 0)
 618                 value = 0;
 619
 620         if (value - pm->fan.min_duty < 10)
 621                 value = pm->fan.min_duty + 10;
 622
 623         if (value > 100)
 624                 pm->fan.max_duty = 100;
 625         else
 626                 pm->fan.max_duty = value;
 627
 628         return count;
 629 }
 630
 631 static SENSOR_DEVICE_ATTR(pwm0_max, S_IRUGO | S_IWUSR,
 632                           nouveau_hwmon_get_pwm0_max,
 633                           nouveau_hwmon_set_pwm0_max, 0);
 634
 635 static struct attribute *hwmon_attributes[] = {
 636         &sensor_dev_attr_temp1_input.dev_attr.attr,
 637         &sensor_dev_attr_temp1_max.dev_attr.attr,
 638         &sensor_dev_attr_temp1_crit.dev_attr.attr,
 639         &sensor_dev_attr_name.dev_attr.attr,
 640         &sensor_dev_attr_update_rate.dev_attr.attr,
 641         NULL
 642 };
 643 static struct attribute *hwmon_fan_rpm_attributes[] = {
 644         &sensor_dev_attr_fan0_input.dev_attr.attr,
 645         NULL
 646 };
 647 static struct attribute *hwmon_pwm_fan_attributes[] = {
 648         &sensor_dev_attr_pwm0.dev_attr.attr,
 649         &sensor_dev_attr_pwm0_min.dev_attr.attr,
 650         &sensor_dev_attr_pwm0_max.dev_attr.attr,
 651         NULL
 652 };
 653
 654 static const struct attribute_group hwmon_attrgroup = {
 655         .attrs = hwmon_attributes,
 656 };
 657 static const struct attribute_group hwmon_fan_rpm_attrgroup = {
 658         .attrs = hwmon_fan_rpm_attributes,
 659 };
 660 static const struct attribute_group hwmon_pwm_fan_attrgroup = {
 661         .attrs = hwmon_pwm_fan_attributes,
 662 };
 663 #endif
 664
 665 static int
 666 nouveau_hwmon_init(struct drm_device *dev)
 667 {
 668         struct drm_nouveau_private *dev_priv = dev->dev_private;
 669         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 670 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
 671         struct device *hwmon_dev;
 672         int ret = 0;
 673
 674         if (!pm->temp_get)
 675                 return -ENODEV;
 676
 677         hwmon_dev = hwmon_device_register(&dev->pdev->dev);
 678         if (IS_ERR(hwmon_dev)) {
 679                 ret = PTR_ERR(hwmon_dev);
 680                 NV_ERROR(dev,
 681                         "Unable to register hwmon device: %d\n", ret);
 682                 return ret;
 683         }
 684         dev_set_drvdata(hwmon_dev, dev);
 685
 686         /* default sysfs entries */
 687         ret = sysfs_create_group(&dev->pdev->dev.kobj, &hwmon_attrgroup);
 688         if (ret) {
 689                 if (ret)
 690                         goto error;
 691         }
 692
 693         /* if the card has a pwm fan */
 694         /*XXX: incorrect, need better detection for this, some boards have
 695          *     the gpio entries for pwm fan control even when there's no
 696          *     actual fan connected to it... therm table? */
 697         if (nouveau_pwmfan_get(dev) >= 0) {
 698                 ret = sysfs_create_group(&dev->pdev->dev.kobj,
 699                                          &hwmon_pwm_fan_attrgroup);
 700                 if (ret)
 701                         goto error;
 702         }
 703
 704         /* if the card can read the fan rpm */
 705         if (nouveau_gpio_func_valid(dev, DCB_GPIO_FAN_SENSE)) {
 706                 ret = sysfs_create_group(&dev->pdev->dev.kobj,
 707                                          &hwmon_fan_rpm_attrgroup);
 708                 if (ret)
 709                         goto error;
 710         }
 711
 712         pm->hwmon = hwmon_dev;
 713
 714         return 0;
 715
 716 error:
 717         NV_ERROR(dev, "Unable to create some hwmon sysfs files: %d\n", ret);
 718         hwmon_device_unregister(hwmon_dev);
 719         pm->hwmon = NULL;
 720         return ret;
 721 #else
 722         pm->hwmon = NULL;
 723         return 0;
 724 #endif
 725 }
 726
 727 static void
 728 nouveau_hwmon_fini(struct drm_device *dev)
 729 {
 730 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
 731         struct drm_nouveau_private *dev_priv = dev->dev_private;
 732         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 733
 734         if (pm->hwmon) {
 735                 sysfs_remove_group(&dev->pdev->dev.kobj, &hwmon_attrgroup);
 736                 sysfs_remove_group(&dev->pdev->dev.kobj,
 737                                    &hwmon_pwm_fan_attrgroup);
 738                 sysfs_remove_group(&dev->pdev->dev.kobj,
 739                                    &hwmon_fan_rpm_attrgroup);
 740
 741                 hwmon_device_unregister(pm->hwmon);
 742         }
 743 #endif
 744 }
 745
 746 #if defined(CONFIG_ACPI) && defined(CONFIG_POWER_SUPPLY)
 747 static int
 748 nouveau_pm_acpi_event(struct notifier_block *nb, unsigned long val, void *data)
 749 {
 750         struct drm_nouveau_private *dev_priv =
 751                 container_of(nb, struct drm_nouveau_private, engine.pm.acpi_nb);
 752         struct drm_device *dev = dev_priv->dev;
 753         struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
 754
 755         if (strcmp(entry->device_class, "ac_adapter") == 0) {
 756                 bool ac = power_supply_is_system_supplied();
 757
 758                 NV_DEBUG(dev, "power supply changed: %s\n", ac ? "AC" : "DC");
 759         }
 760
 761         return NOTIFY_OK;
 762 }
 763 #endif
 764
 765 int
 766 nouveau_pm_init(struct drm_device *dev)
 767 {
 768         struct drm_nouveau_private *dev_priv = dev->dev_private;
 769         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 770         char info[256];
 771         int ret, i;
 772
 773         nouveau_mem_timing_init(dev);
 774         nouveau_volt_init(dev);
 775         nouveau_perf_init(dev);
 776         nouveau_temp_init(dev);
 777
 778         NV_INFO(dev, "%d available performance level(s)\n", pm->nr_perflvl);
 779         for (i = 0; i < pm->nr_perflvl; i++) {
 780                 nouveau_pm_perflvl_info(&pm->perflvl[i], info, sizeof(info));
 781                 NV_INFO(dev, "%d:%s", pm->perflvl[i].id, info);
 782         }
 783
 784         /* determine current ("boot") performance level */
 785         ret = nouveau_pm_perflvl_get(dev, &pm->boot);
 786         if (ret == 0) {
 787                 strncpy(pm->boot.name, "boot", 4);
 788                 pm->cur = &pm->boot;
 789
 790                 nouveau_pm_perflvl_info(&pm->boot, info, sizeof(info));
 791                 NV_INFO(dev, "c:%s", info);
 792         }
 793
 794         /* switch performance levels now if requested */
 795         if (nouveau_perflvl != NULL) {
 796                 ret = nouveau_pm_profile_set(dev, nouveau_perflvl);
 797                 if (ret) {
 798                         NV_ERROR(dev, "error setting perflvl \"%s\": %d\n",
 799                                  nouveau_perflvl, ret);
 800                 }
 801         }
 802
 803         nouveau_sysfs_init(dev);
 804         nouveau_hwmon_init(dev);
 805 #if defined(CONFIG_ACPI) && defined(CONFIG_POWER_SUPPLY)
 806         pm->acpi_nb.notifier_call = nouveau_pm_acpi_event;
 807         register_acpi_notifier(&pm->acpi_nb);
 808 #endif
 809
 810         return 0;
 811 }
 812
 813 void
 814 nouveau_pm_fini(struct drm_device *dev)
 815 {
 816         struct drm_nouveau_private *dev_priv = dev->dev_private;
 817         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 818
 819         if (pm->cur != &pm->boot)
 820                 nouveau_pm_perflvl_set(dev, &pm->boot);
 821
 822         nouveau_temp_fini(dev);
 823         nouveau_perf_fini(dev);
 824         nouveau_volt_fini(dev);
 825         nouveau_mem_timing_fini(dev);
 826
 827 #if defined(CONFIG_ACPI) && defined(CONFIG_POWER_SUPPLY)
 828         unregister_acpi_notifier(&pm->acpi_nb);
 829 #endif
 830         nouveau_hwmon_fini(dev);
 831         nouveau_sysfs_fini(dev);
 832 }
 833
 834 void
 835 nouveau_pm_resume(struct drm_device *dev)
 836 {
 837         struct drm_nouveau_private *dev_priv = dev->dev_private;
 838         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 839         struct nouveau_pm_level *perflvl;
 840
 841         if (!pm->cur || pm->cur == &pm->boot)
 842                 return;
 843
 844         perflvl = pm->cur;
 845         pm->cur = &pm->boot;
 846         nouveau_pm_perflvl_set(dev, perflvl);
 847 }