drivers/acpi/fan.c

   1 /*
   2  *  acpi_fan.c - ACPI Fan Driver ($Revision: 29 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or (at
  12  *  your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/types.h>
  30 #include <linux/uaccess.h>
  31 #include <linux/thermal.h>
  32 #include <linux/acpi.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/sort.h>
  35
  36 MODULE_AUTHOR("Paul Diefenbaugh");
  37 MODULE_DESCRIPTION("ACPI Fan Driver");
  38 MODULE_LICENSE("GPL");
  39
  40 static int acpi_fan_probe(struct platform_device *pdev);
  41 static int acpi_fan_remove(struct platform_device *pdev);
  42
  43 static const struct acpi_device_id fan_device_ids[] = {
  44         {"PNP0C0B", 0},
  45         {"INT3404", 0},
  46         {"", 0},
  47 };
  48 MODULE_DEVICE_TABLE(acpi, fan_device_ids);
  49
  50 #ifdef CONFIG_PM_SLEEP
  51 static int acpi_fan_suspend(struct device *dev);
  52 static int acpi_fan_resume(struct device *dev);
  53 static struct dev_pm_ops acpi_fan_pm = {
  54         .resume = acpi_fan_resume,
  55         .freeze = acpi_fan_suspend,
  56         .thaw = acpi_fan_resume,
  57         .restore = acpi_fan_resume,
  58 };
  59 #define FAN_PM_OPS_PTR (&acpi_fan_pm)
  60 #else
  61 #define FAN_PM_OPS_PTR NULL
  62 #endif
  63
  64 struct acpi_fan_fps {
  65         u64 control;
  66         u64 trip_point;
  67         u64 speed;
  68         u64 noise_level;
  69         u64 power;
  70 };
  71
  72 struct acpi_fan_fif {
  73         u64 revision;
  74         u64 fine_grain_ctrl;
  75         u64 step_size;
  76         u64 low_speed_notification;
  77 };
  78
  79 struct acpi_fan {
  80         bool acpi4;
  81         struct acpi_fan_fif fif;
  82         struct acpi_fan_fps *fps;
  83         int fps_count;
  84         struct thermal_cooling_device *cdev;
  85 };
  86
  87 static struct platform_driver acpi_fan_driver = {
  88         .probe = acpi_fan_probe,
  89         .remove = acpi_fan_remove,
  90         .driver = {
  91                 .name = "acpi-fan",
  92                 .acpi_match_table = fan_device_ids,
  93                 .pm = FAN_PM_OPS_PTR,
  94         },
  95 };
  96
  97 /* thermal cooling device callbacks */
  98 static int fan_get_max_state(struct thermal_cooling_device *cdev, unsigned long
  99                              *state)
 100 {
 101         struct acpi_device *device = cdev->devdata;
 102         struct acpi_fan *fan = acpi_driver_data(device);
 103
 104         if (fan->acpi4)
 105                 *state = fan->fps_count - 1;
 106         else
 107                 *state = 1;
 108         return 0;
 109 }
 110
 111 static int fan_get_state_acpi4(struct acpi_device *device, unsigned long *state)
 112 {
 113         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 114         struct acpi_fan *fan = acpi_driver_data(device);
 115         union acpi_object *obj;
 116         acpi_status status;
 117         int control, i;
 118
 119         status = acpi_evaluate_object(device->handle, "_FST", NULL, &buffer);
 120         if (ACPI_FAILURE(status)) {
 121                 dev_err(&device->dev, "Get fan state failed\n");
 122                 return status;
 123         }
 124
 125         obj = buffer.pointer;
 126         if (!obj || obj->type != ACPI_TYPE_PACKAGE ||
 127             obj->package.count != 3 ||
 128             obj->package.elements[1].type != ACPI_TYPE_INTEGER) {
 129                 dev_err(&device->dev, "Invalid _FST data\n");
 130                 status = -EINVAL;
 131                 goto err;
 132         }
 133
 134         control = obj->package.elements[1].integer.value;
 135         for (i = 0; i < fan->fps_count; i++) {
 136                 if (control == fan->fps[i].control)
 137                         break;
 138         }
 139         if (i == fan->fps_count) {
 140                 dev_dbg(&device->dev, "Invalid control value returned\n");
 141                 status = -EINVAL;
 142                 goto err;
 143         }
 144
 145         *state = i;
 146
 147 err:
 148         kfree(obj);
 149         return status;
 150 }
 151
 152 static int fan_get_state(struct acpi_device *device, unsigned long *state)
 153 {
 154         int result;
 155         int acpi_state = ACPI_STATE_D0;
 156
 157         result = acpi_device_update_power(device, &acpi_state);
 158         if (result)
 159                 return result;
 160
 161         *state = acpi_state == ACPI_STATE_D3_COLD
 162                         || acpi_state == ACPI_STATE_D3_HOT ?
 163                 0 : (acpi_state == ACPI_STATE_D0 ? 1 : -1);
 164         return 0;
 165 }
 166
 167 static int fan_get_cur_state(struct thermal_cooling_device *cdev, unsigned long
 168                              *state)
 169 {
 170         struct acpi_device *device = cdev->devdata;
 171         struct acpi_fan *fan = acpi_driver_data(device);
 172
 173         if (fan->acpi4)
 174                 return fan_get_state_acpi4(device, state);
 175         else
 176                 return fan_get_state(device, state);
 177 }
 178
 179 static int fan_set_state(struct acpi_device *device, unsigned long state)
 180 {
 181         if (state != 0 && state != 1)
 182                 return -EINVAL;
 183
 184         return acpi_device_set_power(device,
 185                                      state ? ACPI_STATE_D0 : ACPI_STATE_D3_COLD);
 186 }
 187
 188 static int fan_set_state_acpi4(struct acpi_device *device, unsigned long state)
 189 {
 190         struct acpi_fan *fan = acpi_driver_data(device);
 191         acpi_status status;
 192
 193         if (state >= fan->fps_count)
 194                 return -EINVAL;
 195
 196         status = acpi_execute_simple_method(device->handle, "_FSL",
 197                                             fan->fps[state].control);
 198         if (ACPI_FAILURE(status)) {
 199                 dev_dbg(&device->dev, "Failed to set state by _FSL\n");
 200                 return status;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static int
 207 fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
 208 {
 209         struct acpi_device *device = cdev->devdata;
 210         struct acpi_fan *fan = acpi_driver_data(device);
 211
 212         if (fan->acpi4)
 213                 return fan_set_state_acpi4(device, state);
 214         else
 215                 return fan_set_state(device, state);
 216  }
 217
 218 static const struct thermal_cooling_device_ops fan_cooling_ops = {
 219         .get_max_state = fan_get_max_state,
 220         .get_cur_state = fan_get_cur_state,
 221         .set_cur_state = fan_set_cur_state,
 222 };
 223
 224 /* --------------------------------------------------------------------------
 225  *                               Driver Interface
 226  * --------------------------------------------------------------------------
 227 */
 228
 229 static bool acpi_fan_is_acpi4(struct acpi_device *device)
 230 {
 231         return acpi_has_method(device->handle, "_FIF") &&
 232                acpi_has_method(device->handle, "_FPS") &&
 233                acpi_has_method(device->handle, "_FSL") &&
 234                acpi_has_method(device->handle, "_FST");
 235 }
 236
 237 static int acpi_fan_get_fif(struct acpi_device *device)
 238 {
 239         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 240         struct acpi_fan *fan = acpi_driver_data(device);
 241         struct acpi_buffer format = { sizeof("NNNN"), "NNNN" };
 242         struct acpi_buffer fif = { sizeof(fan->fif), &fan->fif };
 243         union acpi_object *obj;
 244         acpi_status status;
 245
 246         status = acpi_evaluate_object(device->handle, "_FIF", NULL, &buffer);
 247         if (ACPI_FAILURE(status))
 248                 return status;
 249
 250         obj = buffer.pointer;
 251         if (!obj || obj->type != ACPI_TYPE_PACKAGE) {
 252                 dev_err(&device->dev, "Invalid _FIF data\n");
 253                 status = -EINVAL;
 254                 goto err;
 255         }
 256
 257         status = acpi_extract_package(obj, &format, &fif);
 258         if (ACPI_FAILURE(status)) {
 259                 dev_err(&device->dev, "Invalid _FIF element\n");
 260                 status = -EINVAL;
 261         }
 262
 263 err:
 264         kfree(obj);
 265         return status;
 266 }
 267
 268 static int acpi_fan_speed_cmp(const void *a, const void *b)
 269 {
 270         const struct acpi_fan_fps *fps1 = a;
 271         const struct acpi_fan_fps *fps2 = b;
 272         return fps1->speed - fps2->speed;
 273 }
 274
 275 static int acpi_fan_get_fps(struct acpi_device *device)
 276 {
 277         struct acpi_fan *fan = acpi_driver_data(device);
 278         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 279         union acpi_object *obj;
 280         acpi_status status;
 281         int i;
 282
 283         status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
 284         if (ACPI_FAILURE(status))
 285                 return status;
 286
 287         obj = buffer.pointer;
 288         if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
 289                 dev_err(&device->dev, "Invalid _FPS data\n");
 290                 status = -EINVAL;
 291                 goto err;
 292         }
 293
 294         fan->fps_count = obj->package.count - 1; /* minus revision field */
 295         fan->fps = devm_kzalloc(&device->dev,
 296                                 fan->fps_count * sizeof(struct acpi_fan_fps),
 297                                 GFP_KERNEL);
 298         if (!fan->fps) {
 299                 dev_err(&device->dev, "Not enough memory\n");
 300                 status = -ENOMEM;
 301                 goto err;
 302         }
 303         for (i = 0; i < fan->fps_count; i++) {
 304                 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
 305                 struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] };
 306                 status = acpi_extract_package(&obj->package.elements[i + 1],
 307                                               &format, &fps);
 308                 if (ACPI_FAILURE(status)) {
 309                         dev_err(&device->dev, "Invalid _FPS element\n");
 310                         break;
 311                 }
 312         }
 313
 314         /* sort the state array according to fan speed in increase order */
 315         sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
 316              acpi_fan_speed_cmp, NULL);
 317
 318 err:
 319         kfree(obj);
 320         return status;
 321 }
 322
 323 static int acpi_fan_probe(struct platform_device *pdev)
 324 {
 325         int result = 0;
 326         struct thermal_cooling_device *cdev;
 327         struct acpi_fan *fan;
 328         struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 329         char *name;
 330
 331         fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
 332         if (!fan) {
 333                 dev_err(&device->dev, "No memory for fan\n");
 334                 return -ENOMEM;
 335         }
 336         device->driver_data = fan;
 337         platform_set_drvdata(pdev, fan);
 338
 339         if (acpi_fan_is_acpi4(device)) {
 340                 if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device))
 341                         goto end;
 342                 fan->acpi4 = true;
 343         } else {
 344                 result = acpi_device_update_power(device, NULL);
 345                 if (result) {
 346                         dev_err(&device->dev, "Setting initial power state\n");
 347                         goto end;
 348                 }
 349         }
 350
 351         if (!strncmp(pdev->name, "PNP0C0B", strlen("PNP0C0B")))
 352                 name = "Fan";
 353         else
 354                 name = acpi_device_bid(device);
 355
 356         cdev = thermal_cooling_device_register(name, device,
 357                                                 &fan_cooling_ops);
 358         if (IS_ERR(cdev)) {
 359                 result = PTR_ERR(cdev);
 360                 goto end;
 361         }
 362
 363         dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
 364
 365         fan->cdev = cdev;
 366         result = sysfs_create_link(&pdev->dev.kobj,
 367                                    &cdev->device.kobj,
 368                                    "thermal_cooling");
 369         if (result)
 370                 dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
 371
 372         result = sysfs_create_link(&cdev->device.kobj,
 373                                    &pdev->dev.kobj,
 374                                    "device");
 375         if (result)
 376                 dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
 377
 378 end:
 379         return result;
 380 }
 381
 382 static int acpi_fan_remove(struct platform_device *pdev)
 383 {
 384         struct acpi_fan *fan = platform_get_drvdata(pdev);
 385
 386         sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
 387         sysfs_remove_link(&fan->cdev->device.kobj, "device");
 388         thermal_cooling_device_unregister(fan->cdev);
 389
 390         return 0;
 391 }
 392
 393 #ifdef CONFIG_PM_SLEEP
 394 static int acpi_fan_suspend(struct device *dev)
 395 {
 396         struct acpi_fan *fan = dev_get_drvdata(dev);
 397         if (fan->acpi4)
 398                 return 0;
 399
 400         acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
 401
 402         return AE_OK;
 403 }
 404
 405 static int acpi_fan_resume(struct device *dev)
 406 {
 407         int result;
 408         struct acpi_fan *fan = dev_get_drvdata(dev);
 409
 410         if (fan->acpi4)
 411                 return 0;
 412
 413         result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
 414         if (result)
 415                 dev_err(dev, "Error updating fan power state\n");
 416
 417         return result;
 418 }
 419 #endif
 420
 421 module_platform_driver(acpi_fan_driver);