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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/init.h>
  35 #include <linux/slab.h>
  36 #include <linux/types.h>
  37 #include <linux/pci.h>
  38 #include <linux/pm.h>
  39 #include <linux/thermal.h>
  40 #include <linux/acpi.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         pr_info("Bandwidth value was %ld: status is %d\n", state, status);
 139         if (ACPI_FAILURE(status))
 140                 return -EFAULT;
 141
 142         return 0;
 143 }
 144
 145 static struct thermal_cooling_device_ops memory_cooling_ops = {
 146         .get_max_state = memory_get_max_bandwidth,
 147         .get_cur_state = memory_get_cur_bandwidth,
 148         .set_cur_state = memory_set_cur_bandwidth,
 149 };
 150
 151 /*
 152  * Memory Device Management
 153  */
 154 static int intel_menlow_memory_add(struct acpi_device *device)
 155 {
 156         int result = -ENODEV;
 157         struct thermal_cooling_device *cdev;
 158
 159         if (!device)
 160                 return -EINVAL;
 161
 162         if (!acpi_has_method(device->handle, MEMORY_GET_BANDWIDTH))
 163                 goto end;
 164
 165         if (!acpi_has_method(device->handle, MEMORY_SET_BANDWIDTH))
 166                 goto end;
 167
 168         cdev = thermal_cooling_device_register("Memory controller", device,
 169                                                &memory_cooling_ops);
 170         if (IS_ERR(cdev)) {
 171                 result = PTR_ERR(cdev);
 172                 goto end;
 173         }
 174
 175         device->driver_data = cdev;
 176         result = sysfs_create_link(&device->dev.kobj,
 177                                 &cdev->device.kobj, "thermal_cooling");
 178         if (result)
 179                 goto unregister;
 180
 181         result = sysfs_create_link(&cdev->device.kobj,
 182                                 &device->dev.kobj, "device");
 183         if (result) {
 184                 sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 185                 goto unregister;
 186         }
 187
 188  end:
 189         return result;
 190
 191  unregister:
 192         thermal_cooling_device_unregister(cdev);
 193         return result;
 194
 195 }
 196
 197 static int intel_menlow_memory_remove(struct acpi_device *device)
 198 {
 199         struct thermal_cooling_device *cdev = acpi_driver_data(device);
 200
 201         if (!device || !cdev)
 202                 return -EINVAL;
 203
 204         sysfs_remove_link(&device->dev.kobj, "thermal_cooling");
 205         sysfs_remove_link(&cdev->device.kobj, "device");
 206         thermal_cooling_device_unregister(cdev);
 207
 208         return 0;
 209 }
 210
 211 static const struct acpi_device_id intel_menlow_memory_ids[] = {
 212         {"INT0002", 0},
 213         {"", 0},
 214 };
 215
 216 static struct acpi_driver intel_menlow_memory_driver = {
 217         .name = "intel_menlow_thermal_control",
 218         .ids = intel_menlow_memory_ids,
 219         .ops = {
 220                 .add = intel_menlow_memory_add,
 221                 .remove = intel_menlow_memory_remove,
 222                 },
 223 };
 224
 225 /*
 226  * Sensor control on menlow platform
 227  */
 228
 229 #define THERMAL_AUX0 0
 230 #define THERMAL_AUX1 1
 231 #define GET_AUX0 "GAX0"
 232 #define GET_AUX1 "GAX1"
 233 #define SET_AUX0 "SAX0"
 234 #define SET_AUX1 "SAX1"
 235
 236 struct intel_menlow_attribute {
 237         struct device_attribute attr;
 238         struct device *device;
 239         acpi_handle handle;
 240         struct list_head node;
 241 };
 242
 243 static LIST_HEAD(intel_menlow_attr_list);
 244 static DEFINE_MUTEX(intel_menlow_attr_lock);
 245
 246 /*
 247  * sensor_get_auxtrip - get the current auxtrip value from sensor
 248  * @name: Thermalzone name
 249  * @auxtype : AUX0/AUX1
 250  * @buf: syfs buffer
 251  */
 252 static int sensor_get_auxtrip(acpi_handle handle, int index,
 253                                                         unsigned long long *value)
 254 {
 255         acpi_status status;
 256
 257         if ((index != 0 && index != 1) || !value)
 258                 return -EINVAL;
 259
 260         status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
 261                                        NULL, value);
 262         if (ACPI_FAILURE(status))
 263                 return -EIO;
 264
 265         return 0;
 266 }
 267
 268 /*
 269  * sensor_set_auxtrip - set the new auxtrip value to sensor
 270  * @name: Thermalzone name
 271  * @auxtype : AUX0/AUX1
 272  * @buf: syfs buffer
 273  */
 274 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
 275 {
 276         acpi_status status;
 277         union acpi_object arg = {
 278                 ACPI_TYPE_INTEGER
 279         };
 280         struct acpi_object_list args = {
 281                 1, &arg
 282         };
 283         unsigned long long temp;
 284
 285         if (index != 0 && index != 1)
 286                 return -EINVAL;
 287
 288         status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
 289                                        NULL, &temp);
 290         if (ACPI_FAILURE(status))
 291                 return -EIO;
 292         if ((index && value < temp) || (!index && value > temp))
 293                 return -EINVAL;
 294
 295         arg.integer.value = value;
 296         status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
 297                                        &args, &temp);
 298         if (ACPI_FAILURE(status))
 299                 return -EIO;
 300
 301         /* do we need to check the return value of SAX0/SAX1 ? */
 302
 303         return 0;
 304 }
 305
 306 #define to_intel_menlow_attr(_attr)     \
 307         container_of(_attr, struct intel_menlow_attribute, attr)
 308
 309 static ssize_t aux0_show(struct device *dev,
 310                          struct device_attribute *dev_attr, char *buf)
 311 {
 312         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 313         unsigned long long value;
 314         int result;
 315
 316         result = sensor_get_auxtrip(attr->handle, 0, &value);
 317
 318         return result ? result : sprintf(buf, "%lu", DECI_KELVIN_TO_CELSIUS(value));
 319 }
 320
 321 static ssize_t aux1_show(struct device *dev,
 322                          struct device_attribute *dev_attr, char *buf)
 323 {
 324         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 325         unsigned long long value;
 326         int result;
 327
 328         result = sensor_get_auxtrip(attr->handle, 1, &value);
 329
 330         return result ? result : sprintf(buf, "%lu", DECI_KELVIN_TO_CELSIUS(value));
 331 }
 332
 333 static ssize_t aux0_store(struct device *dev,
 334                           struct device_attribute *dev_attr,
 335                           const char *buf, size_t count)
 336 {
 337         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 338         int value;
 339         int result;
 340
 341         /*Sanity check; should be a positive integer */
 342         if (!sscanf(buf, "%d", &value))
 343                 return -EINVAL;
 344
 345         if (value < 0)
 346                 return -EINVAL;
 347
 348         result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_DECI_KELVIN(value));
 349         return result ? result : count;
 350 }
 351
 352 static ssize_t aux1_store(struct device *dev,
 353                           struct device_attribute *dev_attr,
 354                           const char *buf, size_t count)
 355 {
 356         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 357         int value;
 358         int result;
 359
 360         /*Sanity check; should be a positive integer */
 361         if (!sscanf(buf, "%d", &value))
 362                 return -EINVAL;
 363
 364         if (value < 0)
 365                 return -EINVAL;
 366
 367         result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_DECI_KELVIN(value));
 368         return result ? result : count;
 369 }
 370
 371 /* BIOS can enable/disable the thermal user application in dabney platform */
 372 #define BIOS_ENABLED "\\_TZ.GSTS"
 373 static ssize_t bios_enabled_show(struct device *dev,
 374                                  struct device_attribute *attr, char *buf)
 375 {
 376         acpi_status status;
 377         unsigned long long bios_enabled;
 378
 379         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
 380         if (ACPI_FAILURE(status))
 381                 return -ENODEV;
 382
 383         return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
 384 }
 385
 386 static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show,
 387                                           void *store, struct device *dev,
 388                                           acpi_handle handle)
 389 {
 390         struct intel_menlow_attribute *attr;
 391         int result;
 392
 393         attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
 394         if (!attr)
 395                 return -ENOMEM;
 396
 397         sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */
 398         attr->attr.attr.name = name;
 399         attr->attr.attr.mode = mode;
 400         attr->attr.show = show;
 401         attr->attr.store = store;
 402         attr->device = dev;
 403         attr->handle = handle;
 404
 405         result = device_create_file(dev, &attr->attr);
 406         if (result) {
 407                 kfree(attr);
 408                 return result;
 409         }
 410
 411         mutex_lock(&intel_menlow_attr_lock);
 412         list_add_tail(&attr->node, &intel_menlow_attr_list);
 413         mutex_unlock(&intel_menlow_attr_lock);
 414
 415         return 0;
 416 }
 417
 418 static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl,
 419                                                 void *context, void **rv)
 420 {
 421         acpi_status status;
 422         acpi_handle dummy;
 423         struct thermal_zone_device *thermal;
 424         int result;
 425
 426         result = acpi_bus_get_private_data(handle, (void **)&thermal);
 427         if (result)
 428                 return 0;
 429
 430         /* _TZ must have the AUX0/1 methods */
 431         status = acpi_get_handle(handle, GET_AUX0, &dummy);
 432         if (ACPI_FAILURE(status))
 433                 return (status == AE_NOT_FOUND) ? AE_OK : status;
 434
 435         status = acpi_get_handle(handle, SET_AUX0, &dummy);
 436         if (ACPI_FAILURE(status))
 437                 return (status == AE_NOT_FOUND) ? AE_OK : status;
 438
 439         result = intel_menlow_add_one_attribute("aux0", 0644,
 440                                                 aux0_show, aux0_store,
 441                                                 &thermal->device, handle);
 442         if (result)
 443                 return AE_ERROR;
 444
 445         status = acpi_get_handle(handle, GET_AUX1, &dummy);
 446         if (ACPI_FAILURE(status))
 447                 goto aux1_not_found;
 448
 449         status = acpi_get_handle(handle, SET_AUX1, &dummy);
 450         if (ACPI_FAILURE(status))
 451                 goto aux1_not_found;
 452
 453         result = intel_menlow_add_one_attribute("aux1", 0644,
 454                                                 aux1_show, aux1_store,
 455                                                 &thermal->device, handle);
 456         if (result) {
 457                 intel_menlow_unregister_sensor();
 458                 return AE_ERROR;
 459         }
 460
 461         /*
 462          * create the "dabney_enabled" attribute which means the user app
 463          * should be loaded or not
 464          */
 465
 466         result = intel_menlow_add_one_attribute("bios_enabled", 0444,
 467                                                 bios_enabled_show, NULL,
 468                                                 &thermal->device, handle);
 469         if (result) {
 470                 intel_menlow_unregister_sensor();
 471                 return AE_ERROR;
 472         }
 473
 474         return AE_OK;
 475
 476  aux1_not_found:
 477         if (status == AE_NOT_FOUND)
 478                 return AE_OK;
 479
 480         intel_menlow_unregister_sensor();
 481         return status;
 482 }
 483
 484 static void intel_menlow_unregister_sensor(void)
 485 {
 486         struct intel_menlow_attribute *pos, *next;
 487
 488         mutex_lock(&intel_menlow_attr_lock);
 489         list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
 490                 list_del(&pos->node);
 491                 device_remove_file(pos->device, &pos->attr);
 492                 kfree(pos);
 493         }
 494         mutex_unlock(&intel_menlow_attr_lock);
 495
 496         return;
 497 }
 498
 499 static int __init intel_menlow_module_init(void)
 500 {
 501         int result = -ENODEV;
 502         acpi_status status;
 503         unsigned long long enable;
 504
 505         if (acpi_disabled)
 506                 return result;
 507
 508         /* Looking for the \_TZ.GSTS method */
 509         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
 510         if (ACPI_FAILURE(status) || !enable)
 511                 return -ENODEV;
 512
 513         /* Looking for ACPI device MEM0 with hardware id INT0002 */
 514         result = acpi_bus_register_driver(&intel_menlow_memory_driver);
 515         if (result)
 516                 return result;
 517
 518         /* Looking for sensors in each ACPI thermal zone */
 519         status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
 520                                      ACPI_UINT32_MAX,
 521                                      intel_menlow_register_sensor, NULL, NULL, NULL);
 522         if (ACPI_FAILURE(status)) {
 523                 acpi_bus_unregister_driver(&intel_menlow_memory_driver);
 524                 return -ENODEV;
 525         }
 526
 527         return 0;
 528 }
 529
 530 static void __exit intel_menlow_module_exit(void)
 531 {
 532         acpi_bus_unregister_driver(&intel_menlow_memory_driver);
 533         intel_menlow_unregister_sensor();
 534 }
 535
 536 module_init(intel_menlow_module_init);
 537 module_exit(intel_menlow_module_exit);