drivers/gpu/drm/nouveau/nouveau_hwmon.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 #ifdef CONFIG_ACPI
  26 #include <linux/acpi.h>
  27 #endif
  28 #include <linux/power_supply.h>
  29 #include <linux/hwmon.h>
  30 #include <linux/hwmon-sysfs.h>
  31
  32 #include <drm/drmP.h>
  33
  34 #include "nouveau_drv.h"
  35 #include "nouveau_hwmon.h"
  36
  37 #include <nvkm/subdev/iccsense.h>
  38 #include <nvkm/subdev/volt.h>
  39
  40 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
  41
  42 static ssize_t
  43 nouveau_hwmon_show_temp1_auto_point1_pwm(struct device *d,
  44                                          struct device_attribute *a, char *buf)
  45 {
  46         return snprintf(buf, PAGE_SIZE, "%d\n", 100);
  47 }
  48 static SENSOR_DEVICE_ATTR(temp1_auto_point1_pwm, 0444,
  49                           nouveau_hwmon_show_temp1_auto_point1_pwm, NULL, 0);
  50
  51 static ssize_t
  52 nouveau_hwmon_temp1_auto_point1_temp(struct device *d,
  53                                      struct device_attribute *a, char *buf)
  54 {
  55         struct drm_device *dev = dev_get_drvdata(d);
  56         struct nouveau_drm *drm = nouveau_drm(dev);
  57         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
  58
  59         return snprintf(buf, PAGE_SIZE, "%d\n",
  60               therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST) * 1000);
  61 }
  62 static ssize_t
  63 nouveau_hwmon_set_temp1_auto_point1_temp(struct device *d,
  64                                          struct device_attribute *a,
  65                                          const char *buf, size_t count)
  66 {
  67         struct drm_device *dev = dev_get_drvdata(d);
  68         struct nouveau_drm *drm = nouveau_drm(dev);
  69         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
  70         long value;
  71
  72         if (kstrtol(buf, 10, &value))
  73                 return -EINVAL;
  74
  75         therm->attr_set(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST,
  76                         value / 1000);
  77
  78         return count;
  79 }
  80 static SENSOR_DEVICE_ATTR(temp1_auto_point1_temp, 0644,
  81                           nouveau_hwmon_temp1_auto_point1_temp,
  82                           nouveau_hwmon_set_temp1_auto_point1_temp, 0);
  83
  84 static ssize_t
  85 nouveau_hwmon_temp1_auto_point1_temp_hyst(struct device *d,
  86                                           struct device_attribute *a, char *buf)
  87 {
  88         struct drm_device *dev = dev_get_drvdata(d);
  89         struct nouveau_drm *drm = nouveau_drm(dev);
  90         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
  91
  92         return snprintf(buf, PAGE_SIZE, "%d\n",
  93          therm->attr_get(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST_HYST) * 1000);
  94 }
  95 static ssize_t
  96 nouveau_hwmon_set_temp1_auto_point1_temp_hyst(struct device *d,
  97                                               struct device_attribute *a,
  98                                               const char *buf, size_t count)
  99 {
 100         struct drm_device *dev = dev_get_drvdata(d);
 101         struct nouveau_drm *drm = nouveau_drm(dev);
 102         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 103         long value;
 104
 105         if (kstrtol(buf, 10, &value))
 106                 return -EINVAL;
 107
 108         therm->attr_set(therm, NVKM_THERM_ATTR_THRS_FAN_BOOST_HYST,
 109                         value / 1000);
 110
 111         return count;
 112 }
 113 static SENSOR_DEVICE_ATTR(temp1_auto_point1_temp_hyst, 0644,
 114                           nouveau_hwmon_temp1_auto_point1_temp_hyst,
 115                           nouveau_hwmon_set_temp1_auto_point1_temp_hyst, 0);
 116
 117 static ssize_t
 118 nouveau_hwmon_get_pwm1_max(struct device *d,
 119                            struct device_attribute *a, char *buf)
 120 {
 121         struct drm_device *dev = dev_get_drvdata(d);
 122         struct nouveau_drm *drm = nouveau_drm(dev);
 123         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 124         int ret;
 125
 126         ret = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MAX_DUTY);
 127         if (ret < 0)
 128                 return ret;
 129
 130         return sprintf(buf, "%i\n", ret);
 131 }
 132
 133 static ssize_t
 134 nouveau_hwmon_get_pwm1_min(struct device *d,
 135                            struct device_attribute *a, char *buf)
 136 {
 137         struct drm_device *dev = dev_get_drvdata(d);
 138         struct nouveau_drm *drm = nouveau_drm(dev);
 139         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 140         int ret;
 141
 142         ret = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MIN_DUTY);
 143         if (ret < 0)
 144                 return ret;
 145
 146         return sprintf(buf, "%i\n", ret);
 147 }
 148
 149 static ssize_t
 150 nouveau_hwmon_set_pwm1_min(struct device *d, struct device_attribute *a,
 151                            const char *buf, size_t count)
 152 {
 153         struct drm_device *dev = dev_get_drvdata(d);
 154         struct nouveau_drm *drm = nouveau_drm(dev);
 155         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 156         long value;
 157         int ret;
 158
 159         if (kstrtol(buf, 10, &value))
 160                 return -EINVAL;
 161
 162         ret = therm->attr_set(therm, NVKM_THERM_ATTR_FAN_MIN_DUTY, value);
 163         if (ret < 0)
 164                 return ret;
 165
 166         return count;
 167 }
 168 static SENSOR_DEVICE_ATTR(pwm1_min, 0644,
 169                           nouveau_hwmon_get_pwm1_min,
 170                           nouveau_hwmon_set_pwm1_min, 0);
 171
 172 static ssize_t
 173 nouveau_hwmon_set_pwm1_max(struct device *d, struct device_attribute *a,
 174                            const char *buf, size_t count)
 175 {
 176         struct drm_device *dev = dev_get_drvdata(d);
 177         struct nouveau_drm *drm = nouveau_drm(dev);
 178         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 179         long value;
 180         int ret;
 181
 182         if (kstrtol(buf, 10, &value))
 183                 return -EINVAL;
 184
 185         ret = therm->attr_set(therm, NVKM_THERM_ATTR_FAN_MAX_DUTY, value);
 186         if (ret < 0)
 187                 return ret;
 188
 189         return count;
 190 }
 191 static SENSOR_DEVICE_ATTR(pwm1_max, 0644,
 192                           nouveau_hwmon_get_pwm1_max,
 193                           nouveau_hwmon_set_pwm1_max, 0);
 194
 195 static struct attribute *pwm_fan_sensor_attrs[] = {
 196         &sensor_dev_attr_pwm1_min.dev_attr.attr,
 197         &sensor_dev_attr_pwm1_max.dev_attr.attr,
 198         NULL
 199 };
 200 static const struct attribute_group pwm_fan_sensor_group = {
 201         .attrs = pwm_fan_sensor_attrs,
 202 };
 203
 204 static struct attribute *temp1_auto_point_sensor_attrs[] = {
 205         &sensor_dev_attr_temp1_auto_point1_pwm.dev_attr.attr,
 206         &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr,
 207         &sensor_dev_attr_temp1_auto_point1_temp_hyst.dev_attr.attr,
 208         NULL
 209 };
 210 static const struct attribute_group temp1_auto_point_sensor_group = {
 211         .attrs = temp1_auto_point_sensor_attrs,
 212 };
 213
 214 #define N_ATTR_GROUPS   3
 215
 216 static const u32 nouveau_config_chip[] = {
 217         HWMON_C_UPDATE_INTERVAL,
 218         0
 219 };
 220
 221 static const u32 nouveau_config_in[] = {
 222         HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_LABEL,
 223         0
 224 };
 225
 226 static const u32 nouveau_config_temp[] = {
 227         HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |
 228         HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_EMERGENCY |
 229         HWMON_T_EMERGENCY_HYST,
 230         0
 231 };
 232
 233 static const u32 nouveau_config_fan[] = {
 234         HWMON_F_INPUT,
 235         0
 236 };
 237
 238 static const u32 nouveau_config_pwm[] = {
 239         HWMON_PWM_INPUT | HWMON_PWM_ENABLE,
 240         0
 241 };
 242
 243 static const u32 nouveau_config_power[] = {
 244         HWMON_P_INPUT | HWMON_P_CAP_MAX | HWMON_P_CRIT,
 245         0
 246 };
 247
 248 static const struct hwmon_channel_info nouveau_chip = {
 249         .type = hwmon_chip,
 250         .config = nouveau_config_chip,
 251 };
 252
 253 static const struct hwmon_channel_info nouveau_temp = {
 254         .type = hwmon_temp,
 255         .config = nouveau_config_temp,
 256 };
 257
 258 static const struct hwmon_channel_info nouveau_fan = {
 259         .type = hwmon_fan,
 260         .config = nouveau_config_fan,
 261 };
 262
 263 static const struct hwmon_channel_info nouveau_in = {
 264         .type = hwmon_in,
 265         .config = nouveau_config_in,
 266 };
 267
 268 static const struct hwmon_channel_info nouveau_pwm = {
 269         .type = hwmon_pwm,
 270         .config = nouveau_config_pwm,
 271 };
 272
 273 static const struct hwmon_channel_info nouveau_power = {
 274         .type = hwmon_power,
 275         .config = nouveau_config_power,
 276 };
 277
 278 static const struct hwmon_channel_info *nouveau_info[] = {
 279         &nouveau_chip,
 280         &nouveau_temp,
 281         &nouveau_fan,
 282         &nouveau_in,
 283         &nouveau_pwm,
 284         &nouveau_power,
 285         NULL
 286 };
 287
 288 static umode_t
 289 nouveau_chip_is_visible(const void *data, u32 attr, int channel)
 290 {
 291         switch (attr) {
 292         case hwmon_chip_update_interval:
 293                 return 0444;
 294         default:
 295                 return 0;
 296         }
 297 }
 298
 299 static umode_t
 300 nouveau_power_is_visible(const void *data, u32 attr, int channel)
 301 {
 302         struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
 303         struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);
 304
 305         if (!iccsense || !iccsense->data_valid || list_empty(&iccsense->rails))
 306                 return 0;
 307
 308         switch (attr) {
 309         case hwmon_power_input:
 310                 return 0444;
 311         case hwmon_power_max:
 312                 if (iccsense->power_w_max)
 313                         return 0444;
 314                 return 0;
 315         case hwmon_power_crit:
 316                 if (iccsense->power_w_crit)
 317                         return 0444;
 318                 return 0;
 319         default:
 320                 return 0;
 321         }
 322 }
 323
 324 static umode_t
 325 nouveau_temp_is_visible(const void *data, u32 attr, int channel)
 326 {
 327         struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
 328         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 329
 330         if (!therm || !therm->attr_get || nvkm_therm_temp_get(therm) < 0)
 331                 return 0;
 332
 333         switch (attr) {
 334         case hwmon_temp_input:
 335                 return 0444;
 336         case hwmon_temp_max:
 337         case hwmon_temp_max_hyst:
 338         case hwmon_temp_crit:
 339         case hwmon_temp_crit_hyst:
 340         case hwmon_temp_emergency:
 341         case hwmon_temp_emergency_hyst:
 342                 return 0644;
 343         default:
 344                 return 0;
 345         }
 346 }
 347
 348 static umode_t
 349 nouveau_pwm_is_visible(const void *data, u32 attr, int channel)
 350 {
 351         struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
 352         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 353
 354         if (!therm || !therm->attr_get || !therm->fan_get ||
 355             therm->fan_get(therm) < 0)
 356                 return 0;
 357
 358         switch (attr) {
 359         case hwmon_pwm_enable:
 360         case hwmon_pwm_input:
 361                 return 0644;
 362         default:
 363                 return 0;
 364         }
 365 }
 366
 367 static umode_t
 368 nouveau_input_is_visible(const void *data, u32 attr, int channel)
 369 {
 370         struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
 371         struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
 372
 373         if (!volt || nvkm_volt_get(volt) < 0)
 374                 return 0;
 375
 376         switch (attr) {
 377         case hwmon_in_input:
 378         case hwmon_in_label:
 379         case hwmon_in_min:
 380         case hwmon_in_max:
 381                 return 0444;
 382         default:
 383                 return 0;
 384         }
 385 }
 386
 387 static umode_t
 388 nouveau_fan_is_visible(const void *data, u32 attr, int channel)
 389 {
 390         struct nouveau_drm *drm = nouveau_drm((struct drm_device *)data);
 391         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 392
 393         if (!therm || !therm->attr_get || nvkm_therm_fan_sense(therm) < 0)
 394                 return 0;
 395
 396         switch (attr) {
 397         case hwmon_fan_input:
 398                 return 0444;
 399         default:
 400                 return 0;
 401         }
 402 }
 403
 404 static int
 405 nouveau_chip_read(struct device *dev, u32 attr, int channel, long *val)
 406 {
 407         switch (attr) {
 408         case hwmon_chip_update_interval:
 409                 *val = 1000;
 410                 break;
 411         default:
 412                 return -EOPNOTSUPP;
 413         }
 414
 415         return 0;
 416 }
 417
 418 static int
 419 nouveau_temp_read(struct device *dev, u32 attr, int channel, long *val)
 420 {
 421         struct drm_device *drm_dev = dev_get_drvdata(dev);
 422         struct nouveau_drm *drm = nouveau_drm(drm_dev);
 423         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 424         int ret;
 425
 426         if (!therm || !therm->attr_get)
 427                 return -EOPNOTSUPP;
 428
 429         switch (attr) {
 430         case hwmon_temp_input:
 431                 ret = nvkm_therm_temp_get(therm);
 432                 *val = ret < 0 ? ret : (ret * 1000);
 433                 break;
 434         case hwmon_temp_max:
 435                 *val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK)
 436                                         * 1000;
 437                 break;
 438         case hwmon_temp_max_hyst:
 439                 *val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK_HYST)
 440                                         * 1000;
 441                 break;
 442         case hwmon_temp_crit:
 443                 *val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_CRITICAL)
 444                                         * 1000;
 445                 break;
 446         case hwmon_temp_crit_hyst:
 447                 *val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_CRITICAL_HYST)
 448                                         * 1000;
 449                 break;
 450         case hwmon_temp_emergency:
 451                 *val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN)
 452                                         * 1000;
 453                 break;
 454         case hwmon_temp_emergency_hyst:
 455                 *val = therm->attr_get(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN_HYST)
 456                                         * 1000;
 457                 break;
 458         default:
 459                 return -EOPNOTSUPP;
 460         }
 461
 462         return 0;
 463 }
 464
 465 static int
 466 nouveau_fan_read(struct device *dev, u32 attr, int channel, long *val)
 467 {
 468         struct drm_device *drm_dev = dev_get_drvdata(dev);
 469         struct nouveau_drm *drm = nouveau_drm(drm_dev);
 470         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 471
 472         if (!therm)
 473                 return -EOPNOTSUPP;
 474
 475         switch (attr) {
 476         case hwmon_fan_input:
 477                 *val = nvkm_therm_fan_sense(therm);
 478                 break;
 479         default:
 480                 return -EOPNOTSUPP;
 481         }
 482
 483         return 0;
 484 }
 485
 486 static int
 487 nouveau_in_read(struct device *dev, u32 attr, int channel, long *val)
 488 {
 489         struct drm_device *drm_dev = dev_get_drvdata(dev);
 490         struct nouveau_drm *drm = nouveau_drm(drm_dev);
 491         struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
 492         int ret;
 493
 494         if (!volt)
 495                 return -EOPNOTSUPP;
 496
 497         switch (attr) {
 498         case hwmon_in_input:
 499                 ret = nvkm_volt_get(volt);
 500                 *val = ret < 0 ? ret : (ret / 1000);
 501                 break;
 502         case hwmon_in_min:
 503                 *val = volt->min_uv > 0 ? (volt->min_uv / 1000) : -ENODEV;
 504                 break;
 505         case hwmon_in_max:
 506                 *val = volt->max_uv > 0 ? (volt->max_uv / 1000) : -ENODEV;
 507                 break;
 508         default:
 509                 return -EOPNOTSUPP;
 510         }
 511
 512         return 0;
 513 }
 514
 515 static int
 516 nouveau_pwm_read(struct device *dev, u32 attr, int channel, long *val)
 517 {
 518         struct drm_device *drm_dev = dev_get_drvdata(dev);
 519         struct nouveau_drm *drm = nouveau_drm(drm_dev);
 520         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 521
 522         if (!therm || !therm->attr_get || !therm->fan_get)
 523                 return -EOPNOTSUPP;
 524
 525         switch (attr) {
 526         case hwmon_pwm_enable:
 527                 *val = therm->attr_get(therm, NVKM_THERM_ATTR_FAN_MODE);
 528                 break;
 529         case hwmon_pwm_input:
 530                 *val = therm->fan_get(therm);
 531                 break;
 532         default:
 533                 return -EOPNOTSUPP;
 534         }
 535
 536         return 0;
 537 }
 538
 539 static int
 540 nouveau_power_read(struct device *dev, u32 attr, int channel, long *val)
 541 {
 542         struct drm_device *drm_dev = dev_get_drvdata(dev);
 543         struct nouveau_drm *drm = nouveau_drm(drm_dev);
 544         struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);
 545
 546         if (!iccsense)
 547                 return -EOPNOTSUPP;
 548
 549         switch (attr) {
 550         case hwmon_power_input:
 551                 *val = nvkm_iccsense_read_all(iccsense);
 552                 break;
 553         case hwmon_power_max:
 554                 *val = iccsense->power_w_max;
 555                 break;
 556         case hwmon_power_crit:
 557                 *val = iccsense->power_w_crit;
 558                 break;
 559         default:
 560                 return -EOPNOTSUPP;
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int
 567 nouveau_temp_write(struct device *dev, u32 attr, int channel, long val)
 568 {
 569         struct drm_device *drm_dev = dev_get_drvdata(dev);
 570         struct nouveau_drm *drm = nouveau_drm(drm_dev);
 571         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 572
 573         if (!therm || !therm->attr_set)
 574                 return -EOPNOTSUPP;
 575
 576         switch (attr) {
 577         case hwmon_temp_max:
 578                 return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK,
 579                                         val / 1000);
 580         case hwmon_temp_max_hyst:
 581                 return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_DOWN_CLK_HYST,
 582                                         val / 1000);
 583         case hwmon_temp_crit:
 584                 return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_CRITICAL,
 585                                         val / 1000);
 586         case hwmon_temp_crit_hyst:
 587                 return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_CRITICAL_HYST,
 588                                         val / 1000);
 589         case hwmon_temp_emergency:
 590                 return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN,
 591                                         val / 1000);
 592         case hwmon_temp_emergency_hyst:
 593                 return therm->attr_set(therm, NVKM_THERM_ATTR_THRS_SHUTDOWN_HYST,
 594                                         val / 1000);
 595         default:
 596                 return -EOPNOTSUPP;
 597         }
 598 }
 599
 600 static int
 601 nouveau_pwm_write(struct device *dev, u32 attr, int channel, long val)
 602 {
 603         struct drm_device *drm_dev = dev_get_drvdata(dev);
 604         struct nouveau_drm *drm = nouveau_drm(drm_dev);
 605         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 606
 607         if (!therm || !therm->attr_set)
 608                 return -EOPNOTSUPP;
 609
 610         switch (attr) {
 611         case hwmon_pwm_input:
 612                 return therm->fan_set(therm, val);
 613         case hwmon_pwm_enable:
 614                 return therm->attr_set(therm, NVKM_THERM_ATTR_FAN_MODE, val);
 615         default:
 616                 return -EOPNOTSUPP;
 617         }
 618 }
 619
 620 static umode_t
 621 nouveau_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr,
 622                         int channel)
 623 {
 624         switch (type) {
 625         case hwmon_chip:
 626                 return nouveau_chip_is_visible(data, attr, channel);
 627         case hwmon_temp:
 628                 return nouveau_temp_is_visible(data, attr, channel);
 629         case hwmon_fan:
 630                 return nouveau_fan_is_visible(data, attr, channel);
 631         case hwmon_in:
 632                 return nouveau_input_is_visible(data, attr, channel);
 633         case hwmon_pwm:
 634                 return nouveau_pwm_is_visible(data, attr, channel);
 635         case hwmon_power:
 636                 return nouveau_power_is_visible(data, attr, channel);
 637         default:
 638                 return 0;
 639         }
 640 }
 641
 642 static const char input_label[] = "GPU core";
 643
 644 static int
 645 nouveau_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 646                     int channel, const char **buf)
 647 {
 648         if (type == hwmon_in && attr == hwmon_in_label) {
 649                 *buf = input_label;
 650                 return 0;
 651         }
 652
 653         return -EOPNOTSUPP;
 654 }
 655
 656 static int
 657 nouveau_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 658                                                         int channel, long *val)
 659 {
 660         switch (type) {
 661         case hwmon_chip:
 662                 return nouveau_chip_read(dev, attr, channel, val);
 663         case hwmon_temp:
 664                 return nouveau_temp_read(dev, attr, channel, val);
 665         case hwmon_fan:
 666                 return nouveau_fan_read(dev, attr, channel, val);
 667         case hwmon_in:
 668                 return nouveau_in_read(dev, attr, channel, val);
 669         case hwmon_pwm:
 670                 return nouveau_pwm_read(dev, attr, channel, val);
 671         case hwmon_power:
 672                 return nouveau_power_read(dev, attr, channel, val);
 673         default:
 674                 return -EOPNOTSUPP;
 675         }
 676 }
 677
 678 static int
 679 nouveau_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
 680                                                         int channel, long val)
 681 {
 682         switch (type) {
 683         case hwmon_temp:
 684                 return nouveau_temp_write(dev, attr, channel, val);
 685         case hwmon_pwm:
 686                 return nouveau_pwm_write(dev, attr, channel, val);
 687         default:
 688                 return -EOPNOTSUPP;
 689         }
 690 }
 691
 692 static const struct hwmon_ops nouveau_hwmon_ops = {
 693         .is_visible = nouveau_is_visible,
 694         .read = nouveau_read,
 695         .read_string = nouveau_read_string,
 696         .write = nouveau_write,
 697 };
 698
 699 static const struct hwmon_chip_info nouveau_chip_info = {
 700         .ops = &nouveau_hwmon_ops,
 701         .info = nouveau_info,
 702 };
 703 #endif
 704
 705 int
 706 nouveau_hwmon_init(struct drm_device *dev)
 707 {
 708 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
 709         struct nouveau_drm *drm = nouveau_drm(dev);
 710         struct nvkm_iccsense *iccsense = nvxx_iccsense(&drm->client.device);
 711         struct nvkm_therm *therm = nvxx_therm(&drm->client.device);
 712         struct nvkm_volt *volt = nvxx_volt(&drm->client.device);
 713         const struct attribute_group *special_groups[N_ATTR_GROUPS];
 714         struct nouveau_hwmon *hwmon;
 715         struct device *hwmon_dev;
 716         int ret = 0;
 717         int i = 0;
 718
 719         if (!iccsense && !therm && !volt) {
 720                 NV_DEBUG(drm, "Skipping hwmon registration\n");
 721                 return 0;
 722         }
 723
 724         hwmon = drm->hwmon = kzalloc(sizeof(*hwmon), GFP_KERNEL);
 725         if (!hwmon)
 726                 return -ENOMEM;
 727         hwmon->dev = dev;
 728
 729         if (therm && therm->attr_get && therm->attr_set) {
 730                 if (nvkm_therm_temp_get(therm) >= 0)
 731                         special_groups[i++] = &temp1_auto_point_sensor_group;
 732                 if (therm->fan_get && therm->fan_get(therm) >= 0)
 733                         special_groups[i++] = &pwm_fan_sensor_group;
 734         }
 735
 736         special_groups[i] = 0;
 737         hwmon_dev = hwmon_device_register_with_info(dev->dev, "nouveau", dev,
 738                                                         &nouveau_chip_info,
 739                                                         special_groups);
 740         if (IS_ERR(hwmon_dev)) {
 741                 ret = PTR_ERR(hwmon_dev);
 742                 NV_ERROR(drm, "Unable to register hwmon device: %d\n", ret);
 743                 return ret;
 744         }
 745
 746         hwmon->hwmon = hwmon_dev;
 747         return 0;
 748 #else
 749         return 0;
 750 #endif
 751 }
 752
 753 void
 754 nouveau_hwmon_fini(struct drm_device *dev)
 755 {
 756 #if defined(CONFIG_HWMON) || (defined(MODULE) && defined(CONFIG_HWMON_MODULE))
 757         struct nouveau_hwmon *hwmon = nouveau_hwmon(dev);
 758
 759         if (!hwmon)
 760                 return;
 761
 762         if (hwmon->hwmon)
 763                 hwmon_device_unregister(hwmon->hwmon);
 764
 765         nouveau_drm(dev)->hwmon = NULL;
 766         kfree(hwmon);
 767 #endif
 768 }