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 ? 0 :
 162                  (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 int acpi_fan_get_fps(struct acpi_device *device)
 275 {
 276         struct acpi_fan *fan = acpi_driver_data(device);
 277         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 278         union acpi_object *obj;
 279         acpi_status status;
 280         int i;
 281
 282         status = acpi_evaluate_object(device->handle, "_FPS", NULL, &buffer);
 283         if (ACPI_FAILURE(status))
 284                 return status;
 285
 286         obj = buffer.pointer;
 287         if (!obj || obj->type != ACPI_TYPE_PACKAGE || obj->package.count < 2) {
 288                 dev_err(&device->dev, "Invalid _FPS data\n");
 289                 status = -EINVAL;
 290                 goto err;
 291         }
 292
 293         fan->fps_count = obj->package.count - 1; /* minus revision field */
 294         fan->fps = devm_kzalloc(&device->dev,
 295                                 fan->fps_count * sizeof(struct acpi_fan_fps),
 296                                 GFP_KERNEL);
 297         if (!fan->fps) {
 298                 dev_err(&device->dev, "Not enough memory\n");
 299                 status = -ENOMEM;
 300                 goto err;
 301         }
 302         for (i = 0; i < fan->fps_count; i++) {
 303                 struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
 304                 struct acpi_buffer fps = { sizeof(fan->fps[i]), &fan->fps[i] };
 305                 status = acpi_extract_package(&obj->package.elements[i + 1],
 306                                               &format, &fps);
 307                 if (ACPI_FAILURE(status)) {
 308                         dev_err(&device->dev, "Invalid _FPS element\n");
 309                         break;
 310                 }
 311         }
 312
 313         /* sort the state array according to fan speed in increase order */
 314         sort(fan->fps, fan->fps_count, sizeof(*fan->fps),
 315              acpi_fan_speed_cmp, NULL);
 316
 317 err:
 318         kfree(obj);
 319         return status;
 320 }
 321
 322 static int acpi_fan_probe(struct platform_device *pdev)
 323 {
 324         int result = 0;
 325         struct thermal_cooling_device *cdev;
 326         struct acpi_fan *fan;
 327         struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 328
 329         fan = devm_kzalloc(&pdev->dev, sizeof(*fan), GFP_KERNEL);
 330         if (!fan) {
 331                 dev_err(&device->dev, "No memory for fan\n");
 332                 return -ENOMEM;
 333         }
 334         device->driver_data = fan;
 335         platform_set_drvdata(pdev, fan);
 336
 337         if (acpi_fan_is_acpi4(device)) {
 338                 if (acpi_fan_get_fif(device) || acpi_fan_get_fps(device))
 339                         goto end;
 340                 fan->acpi4 = true;
 341         } else {
 342                 result = acpi_device_update_power(device, NULL);
 343                 if (result) {
 344                         dev_err(&device->dev, "Setting initial power state\n");
 345                         goto end;
 346                 }
 347         }
 348
 349         cdev = thermal_cooling_device_register("Fan", device,
 350                                                 &fan_cooling_ops);
 351         if (IS_ERR(cdev)) {
 352                 result = PTR_ERR(cdev);
 353                 goto end;
 354         }
 355
 356         dev_dbg(&pdev->dev, "registered as cooling_device%d\n", cdev->id);
 357
 358         fan->cdev = cdev;
 359         result = sysfs_create_link(&pdev->dev.kobj,
 360                                    &cdev->device.kobj,
 361                                    "thermal_cooling");
 362         if (result)
 363                 dev_err(&pdev->dev, "Failed to create sysfs link 'thermal_cooling'\n");
 364
 365         result = sysfs_create_link(&cdev->device.kobj,
 366                                    &pdev->dev.kobj,
 367                                    "device");
 368         if (result)
 369                 dev_err(&pdev->dev, "Failed to create sysfs link 'device'\n");
 370
 371 end:
 372         return result;
 373 }
 374
 375 static int acpi_fan_remove(struct platform_device *pdev)
 376 {
 377         struct acpi_fan *fan = platform_get_drvdata(pdev);
 378
 379         sysfs_remove_link(&pdev->dev.kobj, "thermal_cooling");
 380         sysfs_remove_link(&fan->cdev->device.kobj, "device");
 381         thermal_cooling_device_unregister(fan->cdev);
 382
 383         return 0;
 384 }
 385
 386 #ifdef CONFIG_PM_SLEEP
 387 static int acpi_fan_suspend(struct device *dev)
 388 {
 389         struct acpi_fan *fan = dev_get_drvdata(dev);
 390         if (fan->acpi4)
 391                 return 0;
 392
 393         acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D0);
 394
 395         return AE_OK;
 396 }
 397
 398 static int acpi_fan_resume(struct device *dev)
 399 {
 400         int result;
 401         struct acpi_fan *fan = dev_get_drvdata(dev);
 402
 403         if (fan->acpi4)
 404                 return 0;
 405
 406         result = acpi_device_update_power(ACPI_COMPANION(dev), NULL);
 407         if (result)
 408                 dev_err(dev, "Error updating fan power state\n");
 409
 410         return result;
 411 }
 412 #endif
 413
 414 module_platform_driver(acpi_fan_driver);