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