drivers/acpi/fan.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
   4  *
   5  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   6  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/types.h>
  13 #include <linux/uaccess.h>
  14 #include <linux/thermal.h>
  15 #include <linux/acpi.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/sort.h>
  18
  19 MODULE_AUTHOR("Paul Diefenbaugh");
  20 MODULE_DESCRIPTION("ACPI Fan Driver");
  21 MODULE_LICENSE("GPL");
  22
  23 static int acpi_fan_probe(struct platform_device *pdev);
  24 static int acpi_fan_remove(struct platform_device *pdev);
  25
  26 static const struct acpi_device_id fan_device_ids[] = {
  27         {"PNP0C0B", 0},
  28         {"INT3404", 0},
  29         {"INTC1044", 0},
  30         {"INTC1048", 0},
  31         {"", 0},
  32 };
  33 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
  34
  35 #ifdef CONFIG_PM_SLEEP
  36 static int acpi_fan_suspend(struct device *dev);
  37 static int acpi_fan_resume(struct device *dev);
  38 static const struct dev_pm_ops acpi_fan_pm = {
  39         .resume = acpi_fan_resume,
  40         .freeze = acpi_fan_suspend,
  41         .thaw = acpi_fan_resume,
  42         .restore = acpi_fan_resume,
  43 };
  44 #define FAN_PM_OPS_PTR (&acpi_fan_pm)
  45 #else
  46 #define FAN_PM_OPS_PTR NULL
  47 #endif
  48
  49 #define ACPI_FPS_NAME_LEN       20
  50
  51 struct acpi_fan_fps {
  52         u64 control;
  53         u64 trip_point;
  54         u64 speed;
  55         u64 noise_level;
  56         u64 power;
  57         char name[ACPI_FPS_NAME_LEN];
  58         struct device_attribute dev_attr;
  59 };
  60
  61 struct acpi_fan_fif {
  62         u64 revision;
  63         u64 fine_grain_ctrl;
  64         u64 step_size;
  65         u64 low_speed_notification;
  66 };
  67
  68 struct acpi_fan {
  69         bool acpi4;
  70         struct acpi_fan_fif fif;
  71         struct acpi_fan_fps *fps;
  72         int fps_count;
  73         struct thermal_cooling_device *cdev;
  74 };
  75
  76 static struct platform_driver acpi_fan_driver = {
  77         .probe = acpi_fan_probe,
  78         .remove = acpi_fan_remove,
  79         .driver = {
  80                 .name = "acpi-fan",
  81                 .acpi_match_table = fan_device_ids,
  82                 .pm = FAN_PM_OPS_PTR,
  83         },
  84 };
  85
  86 /* thermal cooling device callbacks */
  87 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
  88                              *state)
  89 {
  90         struct acpi_device *device = cdev->devdata;
  91         struct acpi_fan *fan = acpi_driver_data(device);
  92
  93         if (fan->acpi4)
  94                 *state = fan->fps_count - 1;
  95         else
  96                 *state = 1;
  97         return 0;
  98 }
  99
 100 static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state)
 101 {
 102         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 103         struct acpi_fan *fan = acpi_driver_data(device);
 104         union acpi_object *obj;
 105         acpi_status status;
 106         int control, i;
 107
 108         status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer);
 109         if (ACPI_FAILURE(status)) {
 110                 dev_err(&device->dev, "Get fan state failed\n");
 111                 return status;
 112         }
 113
 114         obj = buffer.pointer;
 115         if (!obj || obj->type != ACPI_TYPE_PACKAGE ||
 116             obj->package.count != 3 ||
 117             obj->package.elements[1].type != ACPI_TYPE_INTEGER) {
 118                 dev_err(&device->dev, "Invalid _FST data\n");
 119                 status = -EINVAL;
 120                 goto err;
 121         }
 122
 123         control = obj->package.elements[1].integer.value;
 124         for (i = 0; i < fan->fps_count; i++) {
 125                 /*
 126                  * When Fine Grain Control is set, return the state
 127                  * corresponding to maximum fan->fps[i].control
 128                  * value compared to the current speed. Here the
 129                  * fan->fps[] is sorted array with increasing speed.
 130                  */
 131                 if (fan->fif.fine_grain_ctrl && control < fan->fps[i].control) {
 132                         i = (i > 0) ? i - 1 : 0;
 133                         break;
 134                 } else if (control == fan->fps[i].control) {
 135                         break;
 136                 }
 137         }
 138         if (i == fan->fps_count) {
 139                 dev_dbg(&device->dev, "Invalid control value returned\n");
 140                 status = -EINVAL;
 141                 goto err;
 142         }
 143
 144         *state = i;
 145
 146 err:
 147         kfree(obj);
 148         return status;
 149 }
 150
 151 static int fan_get_state(struct acpi_device *device, unsigned long *state)
 152 {
 153         int result;
 154         int acpi_state = ACPI_STATE_D0;
 155
 156         result = acpi_device_update_power(device, &acpi_state);
 157         if (result)
 158                 return result;
 159
 160         *state = acpi_state == ACPI_STATE_D3_COLD
 161                         || acpi_state == ACPI_STATE_D3_HOT ?
 162                 0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1);
 163         return 0;
 164 }
 165
 166 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
 167                              *state)
 168 {
 169         struct acpi_device *device = cdev->devdata;
 170         struct acpi_fan *fan = acpi_driver_data(device);
 171
 172         if (fan->acpi4)
 173                 return fan_get_state_acpi4(device, state);
 174         else
 175                 return fan_get_state(device, state);
 176 }
 177
 178 static int fan_set_state(struct acpi_device *device, unsigned long state)
 179 {
 180         if (state != 0 && state != 1)
 181                 return -EINVAL;
 182
 183         return acpi_device_set_power(device,
 184                                      state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
 185 }
 186
 187 static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state)
 188 {
 189         struct acpi_fan *fan = acpi_driver_data(device);
 190         acpi_status status;
 191
 192         if (state >= fan->fps_count)
 193                 return -EINVAL;
 194
 195         status = acpi_execute_simple_method(device->handle, "_FSL",
 196                                             fan->fps[state].control);
 197         if (ACPI_FAILURE(status)) {
 198                 dev_dbg(&device->dev, "Failed to set state by _FSL\n");
 199                 return status;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static int
 206 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 207 {
 208         struct acpi_device *device = cdev->devdata;
 209         struct acpi_fan *fan = acpi_driver_data(device);
 210
 211         if (fan->acpi4)
 212                 return fan_set_state_acpi4(device, state);
 213         else
 214                 return fan_set_state(device, state);
 215 }
 216
 217 static const struct thermal_cooling_device_ops fan_cooling_ops = {
 218         .get_max_state = fan_get_max_state,
 219         .get_cur_state = fan_get_cur_state,
 220         .set_cur_state = fan_set_cur_state,
 221 };
 222
 223 /* --------------------------------------------------------------------------
 224  *                               Driver Interface
 225  * --------------------------------------------------------------------------
 226 */
 227
 228 static bool acpi_fan_is_acpi4(struct acpi_device *device)
 229 {
 230         return acpi_has_method(device->handle, "_FIF") &&
 231                acpi_has_method(device->handle, "_FPS") &&
 232                acpi_has_method(device->handle, "_FSL") &&
 233                acpi_has_method(device->handle, "_FST");
 234 }
 235
 236 static int acpi_fan_get_fif(struct acpi_device *device)
 237 {
 238         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 239         struct acpi_fan *fan = acpi_driver_data(device);
 240         struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
 241         struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
 242         union acpi_object *obj;
 243         acpi_status status;
 244
 245         status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer);
 246         if (ACPI_FAILURE(status))
 247                 return status;
 248
 249         obj = buffer.pointer;
 250         if (!obj || obj->type != ACPI_TYPE_PACKAGE) {
 251                 dev_err(&device->dev, "Invalid _FIF data\n");
 252                 status = -EINVAL;
 253                 goto err;
 254         }
 255
 256         status = acpi_extract_package(obj, &format, &fif);
 257         if (ACPI_FAILURE(status)) {
 258                 dev_err(&device->dev, "Invalid _FIF element\n");
 259                 status = -EINVAL;
 260         }
 261
 262 err:
 263         kfree(obj);
 264         return status;
 265 }
 266
 267 static int acpi_fan_speed_cmp(const void *a, const void *b)
 268 {
 269         const struct acpi_fan_fps *fps1 = a;
 270         const struct acpi_fan_fps *fps2 = b;
 271         return fps1->speed - fps2->speed;
 272 }
 273
 274 static ssize_t show_state(struct device *dev, struct device_attribute *attr, char *buf)
 275 {
 276         struct acpi_fan_fps *fps = container_of(attr, struct acpi_fan_fps, dev_attr);
 277         int count;
 278
 279         if (fps->control == 0xFFFFFFFF || fps->control > 100)
 280                 count = scnprintf(buf, PAGE_SIZE, "not-defined:");
 281         else
 282                 count = scnprintf(buf, PAGE_SIZE, "%lld:", fps->control);
 283
 284         if (fps->trip_point == 0xFFFFFFFF || fps->trip_point > 9)
 285                 count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
 286         else
 287                 count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->trip_point);
 288
 289         if (fps->speed == 0xFFFFFFFF)
 290                 count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
 291         else
 292                 count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->speed);
 293
 294         if (fps->noise_level == 0xFFFFFFFF)
 295                 count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined:");
 296         else
 297                 count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld:", fps->noise_level * 100);
 298
 299         if (fps->power == 0xFFFFFFFF)
 300                 count += scnprintf(&buf[count], PAGE_SIZE - count, "not-defined\n");
 301         else
 302                 count += scnprintf(&buf[count], PAGE_SIZE - count, "%lld\n", fps->power);
 303
 304         return count;
 305 }
 306
 307 static int acpi_fan_get_fps(struct acpi_device *device)
 308 {
 309         struct acpi_fan *fan = acpi_driver_data(device);
 310         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 311         union acpi_object *obj;
 312         acpi_status status;
 313         int i;
 314
 315         status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
 316         if (ACPI_FAILURE(status))
 317                 return status;
 318
 319         obj = buffer.pointer;
 320         if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
 321                 dev_err(&device->dev, "Invalid _FPS data\n");
 322                 status = -EINVAL;
 323                 goto err;
 324         }
 325
 326         fan->fps_count = obj->package.count - 1; /* minus revision field */
 327         fan->fps = devm_kcalloc(&device->dev,
 328                                 fan->fps_count, sizeof(struct acpi_fan_fps),
 329                                 GFP_KERNEL);
 330         if (!fan->fps) {
 331                 dev_err(&device->dev, "Not enough memory\n");
 332                 status = -ENOMEM;
 333                 goto err;
 334         }
 335         for (i = 0; i < fan->fps_count; i++) {
 336                 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
 337                 struct acpi_buffer fps = { offsetof(struct acpi_fan_fps, name),
 338                                                 &fan->fps[i] };
 339                 status = acpi_extract_package(&obj->package.elements[i + 1],
 340                                               &format, &fps);
 341                 if (ACPI_FAILURE(status)) {
 342                         dev_err(&device->dev, "Invalid _FPS element\n");
 343                         goto err;
 344                 }
 345         }
 346
 347         /* sort the state array according to fan speed in increase order */
 348         sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
 349              acpi_fan_speed_cmp, NULL);
 350
 351         for (i = 0; i < fan->fps_count; ++i) {
 352                 struct acpi_fan_fps *fps = &fan->fps[i];
 353
 354                 snprintf(fps->name, ACPI_FPS_NAME_LEN, "state%d", i);
 355                 sysfs_attr_init(&fps->dev_attr.attr);
 356                 fps->dev_attr.show = show_state;
 357                 fps->dev_attr.store = NULL;
 358                 fps->dev_attr.attr.name = fps->name;
 359                 fps->dev_attr.attr.mode = 0444;
 360                 status = sysfs_create_file(&device->dev.kobj, &fps->dev_attr.attr);
 361                 if (status) {
 362                         int j;
 363
 364                         for (j = 0; j < i; ++j)
 365                                 sysfs_remove_file(&device->dev.kobj, &fan->fps[j].dev_attr.attr);
 366                         break;
 367                 }
 368         }
 369
 370 err:
 371         kfree(obj);
 372         return status;
 373 }
 374
 375 static int acpi_fan_probe(struct platform_device *pdev)
 376 {
 377         int result = 0;
 378         struct thermal_cooling_device *cdev;
 379         struct acpi_fan *fan;
 380         struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 381         char *name;
 382
 383         fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
 384         if (!fan) {
 385                 dev_err(&device->dev, "No memory for fan\n");
 386                 return -ENOMEM;
 387         }
 388         device->driver_data = fan;
 389         platform_set_drvdata(pdev, fan);
 390
 391         if (acpi_fan_is_acpi4(device)) {
 392                 result = acpi_fan_get_fif(device);
 393                 if (result)
 394                         return result;
 395
 396                 result = acpi_fan_get_fps(device);
 397                 if (result)
 398                         return result;
 399
 400                 fan->acpi4 = true;
 401         } else {
 402                 result = acpi_device_update_power(device, NULL);
 403                 if (result) {
 404                         dev_err(&device->dev, "Failed to set initial power state\n");
 405                         goto err_end;
 406                 }
 407         }
 408
 409         if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B")))
 410                 name = "Fan";
 411         else
 412                 name = acpi_device_bid(device);
 413
 414         cdev = thermal_cooling_device_register(name, device,
 415                                                 &fan_cooling_ops);
 416         if (IS_ERR(cdev)) {
 417                 result = PTR_ERR(cdev);
 418                 goto err_end;
 419         }
 420
 421         dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
 422
 423         fan->cdev = cdev;
 424         result = sysfs_create_link(&pdev->dev.kobj,
 425                                    &cdev->device.kobj,
 426                                    "thermal_cooling");
 427         if (result)
 428                 dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
 429
 430         result = sysfs_create_link(&cdev->device.kobj,
 431                                    &pdev->dev.kobj,
 432                                    "device");
 433         if (result) {
 434                 dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
 435                 goto err_end;
 436         }
 437
 438         return 0;
 439
 440 err_end:
 441         if (fan->acpi4) {
 442                 int i;
 443
 444                 for (i = 0; i < fan->fps_count; ++i)
 445                         sysfs_remove_file(&device->dev.kobj, &fan->fps[i].dev_attr.attr);
 446         }
 447
 448         return result;
 449 }
 450
 451 static int acpi_fan_remove(struct platform_device *pdev)
 452 {
 453         struct acpi_fan *fan = platform_get_drvdata(pdev);
 454
 455         if (fan->acpi4) {
 456                 struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 457                 int i;
 458
 459                 for (i = 0; i < fan->fps_count; ++i)
 460                         sysfs_remove_file(&device->dev.kobj, &fan->fps[i].dev_attr.attr);
 461         }
 462         sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
 463         sysfs_remove_link(&fan->cdev->device.kobj, "device");
 464         thermal_cooling_device_unregister(fan->cdev);
 465
 466         return 0;
 467 }
 468
 469 #ifdef CONFIG_PM_SLEEP
 470 static int acpi_fan_suspend(struct device *dev)
 471 {
 472         struct acpi_fan *fan = dev_get_drvdata(dev);
 473         if (fan->acpi4)
 474                 return 0;
 475
 476         acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
 477
 478         return AE_OK;
 479 }
 480
 481 static int acpi_fan_resume(struct device *dev)
 482 {
 483         int result;
 484         struct acpi_fan *fan = dev_get_drvdata(dev);
 485
 486         if (fan->acpi4)
 487                 return 0;
 488
 489         result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
 490         if (result)
 491                 dev_err(dev, "Error updating fan power state\n");
 492
 493         return result;
 494 }
 495 #endif
 496
 497 module_platform_driver(acpi_fan_driver);