release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/platform/x86/intel_menlow.c

   1 /*
   2  *  intel_menlow.c - Intel menlow Driver for thermal management extension
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   6  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   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; version 2 of the License.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  *  This driver creates the sys I/F for programming the sensors.
  25  *  It also implements the driver for intel menlow memory controller (hardware
  26  *  id is INT0002) which makes use of the platform specific ACPI methods
  27  *  to get/set bandwidth.
  28  */
  29
  30 #include <linux/kernel.h>
  31 #include <linux/module.h>
  32 #include <linux/init.h>
  33 #include <linux/slab.h>
  34 #include <linux/types.h>
  35 #include <linux/pci.h>
  36 #include <linux/pm.h>
  37
  38 #include <linux/thermal.h>
  39 #include <acpi/acpi_bus.h>
  40 #include <acpi/acpi_drivers.h>
  41
  42 MODULE_AUTHOR("Thomas Sujith");
  43 MODULE_AUTHOR("Zhang Rui");
  44 MODULE_DESCRIPTION("Intel Menlow platform specific driver");
  45 MODULE_LICENSE("GPL");
  46
  47 /*
  48  * Memory controller device control
  49  */
  50
  51 #define MEMORY_GET_BANDWIDTH "GTHS"
  52 #define MEMORY_SET_BANDWIDTH "STHS"
  53 #define MEMORY_ARG_CUR_BANDWIDTH 1
  54 #define MEMORY_ARG_MAX_BANDWIDTH 0
  55
  56 static void intel_menlow_unregister_sensor(void);
  57
  58 /*
  59  * GTHS returning 'n' would mean that [0,n-1] states are supported
  60  * In that case max_cstate would be n-1
  61  * GTHS returning '0' would mean that no bandwidth control states are supported
  62  */
  63 static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev,
  64                                     unsigned long *max_state)
  65 {
  66         struct acpi_device *device = cdev->devdata;
  67         acpi_handle handle = device->handle;
  68         unsigned long long value;
  69         struct acpi_object_list arg_list;
  70         union acpi_object arg;
  71         acpi_status status = AE_OK;
  72
  73         arg_list.count = 1;
  74         arg_list.pointer = &arg;
  75         arg.type = ACPI_TYPE_INTEGER;
  76         arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH;
  77         status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
  78                                        &arg_list, &value);
  79         if (ACPI_FAILURE(status))
  80                 return -EFAULT;
  81
  82         if (!value)
  83                 return -EINVAL;
  84
  85         *max_state = value - 1;
  86         return 0;
  87 }
  88
  89 static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev,
  90                                     unsigned long *value)
  91 {
  92         struct acpi_device *device = cdev->devdata;
  93         acpi_handle handle = device->handle;
  94         unsigned long long result;
  95         struct acpi_object_list arg_list;
  96         union acpi_object arg;
  97         acpi_status status = AE_OK;
  98
  99         arg_list.count = 1;
 100         arg_list.pointer = &arg;
 101         arg.type = ACPI_TYPE_INTEGER;
 102         arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH;
 103         status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH,
 104                                        &arg_list, &result);
 105         if (ACPI_FAILURE(status))
 106                 return -EFAULT;
 107
 108         *value = result;
 109         return 0;
 110 }
 111
 112 static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev,
 113                                     unsigned long state)
 114 {
 115         struct acpi_device *device = cdev->devdata;
 116         acpi_handle handle = device->handle;
 117         struct acpi_object_list arg_list;
 118         union acpi_object arg;
 119         acpi_status status;
 120         unsigned long long temp;
 121         unsigned long max_state;
 122
 123         if (memory_get_max_bandwidth(cdev, &max_state))
 124                 return -EFAULT;
 125
 126         if (state > max_state)
 127                 return -EINVAL;
 128
 129         arg_list.count = 1;
 130         arg_list.pointer = &arg;
 131         arg.type = ACPI_TYPE_INTEGER;
 132         arg.integer.value = state;
 133
 134         status =
 135             acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list,
 136                                   &temp);
 137
 138         printk(KERN_INFO
 139                "Bandwidth value was %ld: status is %d\n", state, status);
 140         if (ACPI_FAILURE(status))
 141                 return -EFAULT;
 142
 143         return 0;
 144 }
 145
 146 static struct thermal_cooling_device_ops memory_cooling_ops = {
 147         .get_max_state = memory_get_max_bandwidth,
 148         .get_cur_state = memory_get_cur_bandwidth,
 149         .set_cur_state = memory_set_cur_bandwidth,
 150 };
 151
 152 /*
 153  * Memory Device Management
 154  */
 155 static int intel_menlow_memory_add(struct acpi_device *device)
 156 {
 157         int result = -ENODEV;
 158         acpi_status status = AE_OK;
 159         acpi_handle dummy;
 160         struct thermal_cooling_device *cdev;
 161
 162         if (!device)
 163                 return -EINVAL;
 164
 165         status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy);
 166         if (ACPI_FAILURE(status))
 167                 goto end;
 168
 169         status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy);
 170         if (ACPI_FAILURE(status))
 171                 goto end;
 172
 173         cdev = thermal_cooling_device_register("Memory controller", device,
 174                                                &memory_cooling_ops);
 175         if (IS_ERR(cdev)) {
 176                 result = PTR_ERR(cdev);
 177                 goto end;
 178         }
 179
 180         device->driver_data = cdev;
 181         result = sysfs_create_link(&device->dev.kobj,
 182                                 &cdev->device.kobj, "thermal_cooling");
 183         if (result)
 184                 goto unregister;
 185
 186         result = sysfs_create_link(&cdev->device.kobj,
 187                                 &device->dev.kobj, "device");
 188         if (result) {
 189                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 190                 goto unregister;
 191         }
 192
 193  end:
 194         return result;
 195
 196  unregister:
 197         thermal_cooling_device_unregister(cdev);
 198         return result;
 199
 200 }
 201
 202 static int intel_menlow_memory_remove(struct acpi_device *device, int type)
 203 {
 204         struct thermal_cooling_device *cdev = acpi_driver_data(device);
 205
 206         if (!device || !cdev)
 207                 return -EINVAL;
 208
 209         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 210         sysfs_remove_link(&cdev->device.kobj, "device");
 211         thermal_cooling_device_unregister(cdev);
 212
 213         return 0;
 214 }
 215
 216 static const struct acpi_device_id intel_menlow_memory_ids[] = {
 217         {"INT0002", 0},
 218         {"", 0},
 219 };
 220
 221 static struct acpi_driver intel_menlow_memory_driver = {
 222         .name = "intel_menlow_thermal_control",
 223         .ids = intel_menlow_memory_ids,
 224         .ops = {
 225                 .add = intel_menlow_memory_add,
 226                 .remove = intel_menlow_memory_remove,
 227                 },
 228 };
 229
 230 /*
 231  * Sensor control on menlow platform
 232  */
 233
 234 #define THERMAL_AUX0 0
 235 #define THERMAL_AUX1 1
 236 #define GET_AUX0 "GAX0"
 237 #define GET_AUX1 "GAX1"
 238 #define SET_AUX0 "SAX0"
 239 #define SET_AUX1 "SAX1"
 240
 241 struct intel_menlow_attribute {
 242         struct device_attribute attr;
 243         struct device *device;
 244         acpi_handle handle;
 245         struct list_head node;
 246 };
 247
 248 static LIST_HEAD(intel_menlow_attr_list);
 249 static DEFINE_MUTEX(intel_menlow_attr_lock);
 250
 251 /*
 252  * sensor_get_auxtrip - get the current auxtrip value from sensor
 253  * @name: Thermalzone name
 254  * @auxtype : AUX0/AUX1
 255  * @buf: syfs buffer
 256  */
 257 static int sensor_get_auxtrip(acpi_handle handle, int index,
 258                                                         unsigned long long *value)
 259 {
 260         acpi_status status;
 261
 262         if ((index != 0 && index != 1) || !value)
 263                 return -EINVAL;
 264
 265         status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
 266                                        NULL, value);
 267         if (ACPI_FAILURE(status))
 268                 return -EIO;
 269
 270         return 0;
 271 }
 272
 273 /*
 274  * sensor_set_auxtrip - set the new auxtrip value to sensor
 275  * @name: Thermalzone name
 276  * @auxtype : AUX0/AUX1
 277  * @buf: syfs buffer
 278  */
 279 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
 280 {
 281         acpi_status status;
 282         union acpi_object arg = {
 283                 ACPI_TYPE_INTEGER
 284         };
 285         struct acpi_object_list args = {
 286                 1, &arg
 287         };
 288         unsigned long long temp;
 289
 290         if (index != 0 && index != 1)
 291                 return -EINVAL;
 292
 293         status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
 294                                        NULL, &temp);
 295         if (ACPI_FAILURE(status))
 296                 return -EIO;
 297         if ((index && value < temp) || (!index && value > temp))
 298                 return -EINVAL;
 299
 300         arg.integer.value = value;
 301         status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
 302                                        &args, &temp);
 303         if (ACPI_FAILURE(status))
 304                 return -EIO;
 305
 306         /* do we need to check the return value of SAX0/SAX1 ? */
 307
 308         return 0;
 309 }
 310
 311 #define to_intel_menlow_attr(_attr)     \
 312         container_of(_attr, struct intel_menlow_attribute, attr)
 313
 314 static ssize_t aux0_show(struct device *dev,
 315                          struct device_attribute *dev_attr, char *buf)
 316 {
 317         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 318         unsigned long long value;
 319         int result;
 320
 321         result = sensor_get_auxtrip(attr->handle, 0, &value);
 322
 323         return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
 324 }
 325
 326 static ssize_t aux1_show(struct device *dev,
 327                          struct device_attribute *dev_attr, char *buf)
 328 {
 329         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 330         unsigned long long value;
 331         int result;
 332
 333         result = sensor_get_auxtrip(attr->handle, 1, &value);
 334
 335         return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
 336 }
 337
 338 static ssize_t aux0_store(struct device *dev,
 339                           struct device_attribute *dev_attr,
 340                           const char *buf, size_t count)
 341 {
 342         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 343         int value;
 344         int result;
 345
 346         /*Sanity check; should be a positive integer */
 347         if (!sscanf(buf, "%d", &value))
 348                 return -EINVAL;
 349
 350         if (value < 0)
 351                 return -EINVAL;
 352
 353         result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
 354         return result ? result : count;
 355 }
 356
 357 static ssize_t aux1_store(struct device *dev,
 358                           struct device_attribute *dev_attr,
 359                           const char *buf, size_t count)
 360 {
 361         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 362         int value;
 363         int result;
 364
 365         /*Sanity check; should be a positive integer */
 366         if (!sscanf(buf, "%d", &value))
 367                 return -EINVAL;
 368
 369         if (value < 0)
 370                 return -EINVAL;
 371
 372         result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
 373         return result ? result : count;
 374 }
 375
 376 /* BIOS can enable/disable the thermal user application in dabney platform */
 377 #define BIOS_ENABLED "\\_TZ.GSTS"
 378 static ssize_t bios_enabled_show(struct device *dev,
 379                                  struct device_attribute *attr, char *buf)
 380 {
 381         acpi_status status;
 382         unsigned long long bios_enabled;
 383
 384         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
 385         if (ACPI_FAILURE(status))
 386                 return -ENODEV;
 387
 388         return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
 389 }
 390
 391 static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
 392                                           void *store, struct device *dev,
 393                                           acpi_handle handle)
 394 {
 395         struct intel_menlow_attribute *attr;
 396         int result;
 397
 398         attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
 399         if (!attr)
 400                 return -ENOMEM;
 401
 402         sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
 403         attr->attr.attr.name = name;
 404         attr->attr.attr.mode = mode;
 405         attr->attr.show = show;
 406         attr->attr.store = store;
 407         attr->device = dev;
 408         attr->handle = handle;
 409
 410         result = device_create_file(dev, &attr->attr);
 411         if (result) {
 412                 kfree(attr);
 413                 return result;
 414         }
 415
 416         mutex_lock(&intel_menlow_attr_lock);
 417         list_add_tail(&attr->node, &intel_menlow_attr_list);
 418         mutex_unlock(&intel_menlow_attr_lock);
 419
 420         return 0;
 421 }
 422
 423 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
 424                                                 void *context, void **rv)
 425 {
 426         acpi_status status;
 427         acpi_handle dummy;
 428         struct thermal_zone_device *thermal;
 429         int result;
 430
 431         result = acpi_bus_get_private_data(handle, (void **)&thermal);
 432         if (result)
 433                 return 0;
 434
 435         /* _TZ must have the AUX0/1 methods */
 436         status = acpi_get_handle(handle, GET_AUX0, &dummy);
 437         if (ACPI_FAILURE(status))
 438                 return (status == AE_NOT_FOUND) ? AE_OK : status;
 439
 440         status = acpi_get_handle(handle, SET_AUX0, &dummy);
 441         if (ACPI_FAILURE(status))
 442                 return (status == AE_NOT_FOUND) ? AE_OK : status;
 443
 444         result = intel_menlow_add_one_attribute("aux0", 0644,
 445                                                 aux0_show, aux0_store,
 446                                                 &thermal->device, handle);
 447         if (result)
 448                 return AE_ERROR;
 449
 450         status = acpi_get_handle(handle, GET_AUX1, &dummy);
 451         if (ACPI_FAILURE(status))
 452                 goto aux1_not_found;
 453
 454         status = acpi_get_handle(handle, SET_AUX1, &dummy);
 455         if (ACPI_FAILURE(status))
 456                 goto aux1_not_found;
 457
 458         result = intel_menlow_add_one_attribute("aux1", 0644,
 459                                                 aux1_show, aux1_store,
 460                                                 &thermal->device, handle);
 461         if (result) {
 462                 intel_menlow_unregister_sensor();
 463                 return AE_ERROR;
 464         }
 465
 466         /*
 467          * create the "dabney_enabled" attribute which means the user app
 468          * should be loaded or not
 469          */
 470
 471         result = intel_menlow_add_one_attribute("bios_enabled", 0444,
 472                                                 bios_enabled_show, NULL,
 473                                                 &thermal->device, handle);
 474         if (result) {
 475                 intel_menlow_unregister_sensor();
 476                 return AE_ERROR;
 477         }
 478
 479  aux1_not_found:
 480         if (status == AE_NOT_FOUND)
 481                 return AE_OK;
 482
 483         intel_menlow_unregister_sensor();
 484         return status;
 485 }
 486
 487 static void intel_menlow_unregister_sensor(void)
 488 {
 489         struct intel_menlow_attribute *pos, *next;
 490
 491         mutex_lock(&intel_menlow_attr_lock);
 492         list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
 493                 list_del(&pos->node);
 494                 device_remove_file(pos->device, &pos->attr);
 495                 kfree(pos);
 496         }
 497         mutex_unlock(&intel_menlow_attr_lock);
 498
 499         return;
 500 }
 501
 502 static int __init intel_menlow_module_init(void)
 503 {
 504         int result = -ENODEV;
 505         acpi_status status;
 506         unsigned long long enable;
 507
 508         if (acpi_disabled)
 509                 return result;
 510
 511         /* Looking for the \_TZ.GSTS method */
 512         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
 513         if (ACPI_FAILURE(status) || !enable)
 514                 return -ENODEV;
 515
 516         /* Looking for ACPI device MEM0 with hardware id INT0002 */
 517         result = acpi_bus_register_driver(&intel_menlow_memory_driver);
 518         if (result)
 519                 return result;
 520
 521         /* Looking for sensors in each ACPI thermal zone */
 522         status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
 523                                      ACPI_UINT32_MAX,
 524                                      intel_menlow_register_sensor, NULL, NULL, NULL);
 525         if (ACPI_FAILURE(status)) {
 526                 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
 527                 return -ENODEV;
 528         }
 529
 530         return 0;
 531 }
 532
 533 static void __exit intel_menlow_module_exit(void)
 534 {
 535         acpi_bus_unregister_driver(&intel_menlow_memory_driver);
 536         intel_menlow_unregister_sensor();
 537 }
 538
 539 module_init(intel_menlow_module_init);
 540 module_exit(intel_menlow_module_exit);