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 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 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, "%lld\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         unsigned long long 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                                   &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,
 256                                                         unsigned long long *value)
 257 {
 258         acpi_status status;
 259
 260         if ((index != 0 && index != 1) || !value)
 261                 return -EINVAL;
 262
 263         status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0,
 264                                        NULL, value);
 265         if (ACPI_FAILURE(status))
 266                 return -EIO;
 267
 268         return 0;
 269 }
 270
 271 /*
 272  * sensor_set_auxtrip - set the new auxtrip value to sensor
 273  * @name: Thermalzone name
 274  * @auxtype : AUX0/AUX1
 275  * @buf: syfs buffer
 276  */
 277 static int sensor_set_auxtrip(acpi_handle handle, int index, int value)
 278 {
 279         acpi_status status;
 280         union acpi_object arg = {
 281                 ACPI_TYPE_INTEGER
 282         };
 283         struct acpi_object_list args = {
 284                 1, &arg
 285         };
 286         unsigned long long temp;
 287
 288         if (index != 0 && index != 1)
 289                 return -EINVAL;
 290
 291         status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1,
 292                                        NULL, &temp);
 293         if (ACPI_FAILURE(status))
 294                 return -EIO;
 295         if ((index && value < temp) || (!index && value > temp))
 296                 return -EINVAL;
 297
 298         arg.integer.value = value;
 299         status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0,
 300                                        &args, &temp);
 301         if (ACPI_FAILURE(status))
 302                 return -EIO;
 303
 304         /* do we need to check the return value of SAX0/SAX1 ? */
 305
 306         return 0;
 307 }
 308
 309 #define to_intel_menlow_attr(_attr)     \
 310         container_of(_attr, struct intel_menlow_attribute, attr)
 311
 312 static ssize_t aux0_show(struct device *dev,
 313                          struct device_attribute *dev_attr, char *buf)
 314 {
 315         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 316         unsigned long long value;
 317         int result;
 318
 319         result = sensor_get_auxtrip(attr->handle, 0, &value);
 320
 321         return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
 322 }
 323
 324 static ssize_t aux1_show(struct device *dev,
 325                          struct device_attribute *dev_attr, char *buf)
 326 {
 327         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 328         unsigned long long value;
 329         int result;
 330
 331         result = sensor_get_auxtrip(attr->handle, 1, &value);
 332
 333         return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value));
 334 }
 335
 336 static ssize_t aux0_store(struct device *dev,
 337                           struct device_attribute *dev_attr,
 338                           const char *buf, size_t count)
 339 {
 340         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 341         int value;
 342         int result;
 343
 344         /*Sanity check; should be a positive integer */
 345         if (!sscanf(buf, "%d", &value))
 346                 return -EINVAL;
 347
 348         if (value < 0)
 349                 return -EINVAL;
 350
 351         result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value));
 352         return result ? result : count;
 353 }
 354
 355 static ssize_t aux1_store(struct device *dev,
 356                           struct device_attribute *dev_attr,
 357                           const char *buf, size_t count)
 358 {
 359         struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr);
 360         int value;
 361         int result;
 362
 363         /*Sanity check; should be a positive integer */
 364         if (!sscanf(buf, "%d", &value))
 365                 return -EINVAL;
 366
 367         if (value < 0)
 368                 return -EINVAL;
 369
 370         result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value));
 371         return result ? result : count;
 372 }
 373
 374 /* BIOS can enable/disable the thermal user application in dabney platform */
 375 #define BIOS_ENABLED "\\_TZ.GSTS"
 376 static ssize_t bios_enabled_show(struct device *dev,
 377                                  struct device_attribute *attr, char *buf)
 378 {
 379         acpi_status status;
 380         unsigned long long bios_enabled;
 381
 382         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled);
 383         if (ACPI_FAILURE(status))
 384                 return -ENODEV;
 385
 386         return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled");
 387 }
 388
 389 static int intel_menlow_add_one_attribute(char *name, int mode, void *show,
 390                                           void *store, struct device *dev,
 391                                           acpi_handle handle)
 392 {
 393         struct intel_menlow_attribute *attr;
 394         int result;
 395
 396         attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL);
 397         if (!attr)
 398                 return -ENOMEM;
 399
 400         attr->attr.attr.name = name;
 401         attr->attr.attr.mode = mode;
 402         attr->attr.show = show;
 403         attr->attr.store = store;
 404         attr->device = dev;
 405         attr->handle = handle;
 406
 407         result = device_create_file(dev, &attr->attr);
 408         if (result)
 409                 return result;
 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                 goto not_found;
 434
 435         status = acpi_get_handle(handle, SET_AUX0, &dummy);
 436         if (ACPI_FAILURE(status))
 437                 goto not_found;
 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 not_found;
 448
 449         status = acpi_get_handle(handle, SET_AUX1, &dummy);
 450         if (ACPI_FAILURE(status))
 451                 goto 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                 return AE_ERROR;
 458
 459         /*
 460          * create the "dabney_enabled" attribute which means the user app
 461          * should be loaded or not
 462          */
 463
 464         result = intel_menlow_add_one_attribute("bios_enabled", 0444,
 465                                                 bios_enabled_show, NULL,
 466                                                 &thermal->device, handle);
 467         if (result)
 468                 return AE_ERROR;
 469
 470  not_found:
 471         if (status == AE_NOT_FOUND)
 472                 return AE_OK;
 473         else
 474                 return status;
 475 }
 476
 477 static void intel_menlow_unregister_sensor(void)
 478 {
 479         struct intel_menlow_attribute *pos, *next;
 480
 481         mutex_lock(&intel_menlow_attr_lock);
 482         list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) {
 483                 list_del(&pos->node);
 484                 device_remove_file(pos->device, &pos->attr);
 485                 kfree(pos);
 486         }
 487         mutex_unlock(&intel_menlow_attr_lock);
 488
 489         return;
 490 }
 491
 492 static int __init intel_menlow_module_init(void)
 493 {
 494         int result = -ENODEV;
 495         acpi_status status;
 496         unsigned long long enable;
 497
 498         if (acpi_disabled)
 499                 return result;
 500
 501         /* Looking for the \_TZ.GSTS method */
 502         status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable);
 503         if (ACPI_FAILURE(status) || !enable)
 504                 return -ENODEV;
 505
 506         /* Looking for ACPI device MEM0 with hardware id INT0002 */
 507         result = acpi_bus_register_driver(&intel_menlow_memory_driver);
 508         if (result)
 509                 return result;
 510
 511         /* Looking for sensors in each ACPI thermal zone */
 512         status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT,
 513                                      ACPI_UINT32_MAX,
 514                                      intel_menlow_register_sensor, NULL, NULL);
 515         if (ACPI_FAILURE(status))
 516                 return -ENODEV;
 517
 518         return 0;
 519 }
 520
 521 static void __exit intel_menlow_module_exit(void)
 522 {
 523         acpi_bus_unregister_driver(&intel_menlow_memory_driver);
 524         intel_menlow_unregister_sensor();
 525 }
 526
 527 module_init(intel_menlow_module_init);
 528 module_exit(intel_menlow_module_exit);