Thomas Sujith | cc0573b | 2008-01-25 11:45:44 +0800 | [diff] [blame] | 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 | acpi_driver_data(device) = cdev; |
| 174 | if (!cdev) |
| 175 | result = -ENODEV; |
| 176 | else { |
| 177 | result = sysfs_create_link(&device->dev.kobj, |
| 178 | &cdev->device.kobj, "thermal_cooling"); |
| 179 | if (result) |
| 180 | goto unregister; |
| 181 | |
| 182 | result = sysfs_create_link(&cdev->device.kobj, |
| 183 | &device->dev.kobj, "device"); |
| 184 | if (result) { |
| 185 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
| 186 | goto unregister; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | end: |
| 191 | return result; |
| 192 | |
| 193 | unregister: |
| 194 | thermal_cooling_device_unregister(cdev); |
| 195 | return result; |
| 196 | |
| 197 | } |
| 198 | |
| 199 | static int intel_menlow_memory_remove(struct acpi_device *device, int type) |
| 200 | { |
| 201 | struct thermal_cooling_device *cdev = acpi_driver_data(device); |
| 202 | |
| 203 | if (!device || !cdev) |
| 204 | return -EINVAL; |
| 205 | |
| 206 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); |
| 207 | sysfs_remove_link(&cdev->device.kobj, "device"); |
| 208 | thermal_cooling_device_unregister(cdev); |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | const static struct acpi_device_id intel_menlow_memory_ids[] = { |
| 214 | {"INT0002", 0}, |
| 215 | {"", 0}, |
| 216 | }; |
| 217 | |
| 218 | static struct acpi_driver intel_menlow_memory_driver = { |
| 219 | .name = "intel_menlow_thermal_control", |
| 220 | .ids = intel_menlow_memory_ids, |
| 221 | .ops = { |
| 222 | .add = intel_menlow_memory_add, |
| 223 | .remove = intel_menlow_memory_remove, |
| 224 | }, |
| 225 | }; |
| 226 | |
| 227 | /* |
| 228 | * Sensor control on menlow platform |
| 229 | */ |
| 230 | |
| 231 | #define THERMAL_AUX0 0 |
| 232 | #define THERMAL_AUX1 1 |
| 233 | #define GET_AUX0 "GAX0" |
| 234 | #define GET_AUX1 "GAX1" |
| 235 | #define SET_AUX0 "SAX0" |
| 236 | #define SET_AUX1 "SAX1" |
| 237 | |
| 238 | struct intel_menlow_attribute { |
| 239 | struct device_attribute attr; |
| 240 | struct device *device; |
| 241 | acpi_handle handle; |
| 242 | struct list_head node; |
| 243 | }; |
| 244 | |
| 245 | static LIST_HEAD(intel_menlow_attr_list); |
| 246 | static DEFINE_MUTEX(intel_menlow_attr_lock); |
| 247 | |
| 248 | /* |
| 249 | * sensor_get_auxtrip - get the current auxtrip value from sensor |
| 250 | * @name: Thermalzone name |
| 251 | * @auxtype : AUX0/AUX1 |
| 252 | * @buf: syfs buffer |
| 253 | */ |
| 254 | static int sensor_get_auxtrip(acpi_handle handle, int index, int *value) |
| 255 | { |
| 256 | acpi_status status; |
| 257 | |
| 258 | if ((index != 0 && index != 1) || !value) |
| 259 | return -EINVAL; |
| 260 | |
| 261 | status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0, |
| 262 | NULL, (unsigned long *)value); |
| 263 | if (ACPI_FAILURE(status)) |
| 264 | return -EIO; |
| 265 | |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | /* |
| 270 | * sensor_set_auxtrip - set the new auxtrip value to sensor |
| 271 | * @name: Thermalzone name |
| 272 | * @auxtype : AUX0/AUX1 |
| 273 | * @buf: syfs buffer |
| 274 | */ |
| 275 | static int sensor_set_auxtrip(acpi_handle handle, int index, int value) |
| 276 | { |
| 277 | acpi_status status; |
| 278 | union acpi_object arg = { |
| 279 | ACPI_TYPE_INTEGER |
| 280 | }; |
| 281 | struct acpi_object_list args = { |
| 282 | 1, &arg |
| 283 | }; |
| 284 | int temp; |
| 285 | |
| 286 | if (index != 0 && index != 1) |
| 287 | return -EINVAL; |
| 288 | |
| 289 | status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1, |
| 290 | NULL, (unsigned long *)&temp); |
| 291 | if (ACPI_FAILURE(status)) |
| 292 | return -EIO; |
| 293 | if ((index && value < temp) || (!index && value > temp)) |
| 294 | return -EINVAL; |
| 295 | |
| 296 | arg.integer.value = value; |
| 297 | status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0, |
| 298 | &args, (unsigned long *)&temp); |
| 299 | if (ACPI_FAILURE(status)) |
| 300 | return -EIO; |
| 301 | |
| 302 | /* do we need to check the return value of SAX0/SAX1 ? */ |
| 303 | |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | #define to_intel_menlow_attr(_attr) \ |
| 308 | container_of(_attr, struct intel_menlow_attribute, attr) |
| 309 | |
| 310 | static ssize_t aux0_show(struct device *dev, |
| 311 | struct device_attribute *dev_attr, char *buf) |
| 312 | { |
| 313 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); |
| 314 | int value; |
| 315 | int result; |
| 316 | |
| 317 | result = sensor_get_auxtrip(attr->handle, 0, &value); |
| 318 | |
| 319 | return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value)); |
| 320 | } |
| 321 | |
| 322 | static ssize_t aux1_show(struct device *dev, |
| 323 | struct device_attribute *dev_attr, char *buf) |
| 324 | { |
| 325 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); |
| 326 | int value; |
| 327 | int result; |
| 328 | |
| 329 | result = sensor_get_auxtrip(attr->handle, 1, &value); |
| 330 | |
| 331 | return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value)); |
| 332 | } |
| 333 | |
| 334 | static ssize_t aux0_store(struct device *dev, |
| 335 | struct device_attribute *dev_attr, |
| 336 | const char *buf, size_t count) |
| 337 | { |
| 338 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); |
| 339 | int value; |
| 340 | int result; |
| 341 | |
| 342 | /*Sanity check; should be a positive integer */ |
| 343 | if (!sscanf(buf, "%d", &value)) |
| 344 | return -EINVAL; |
| 345 | |
| 346 | if (value < 0) |
| 347 | return -EINVAL; |
| 348 | |
| 349 | result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value)); |
| 350 | return result ? result : count; |
| 351 | } |
| 352 | |
| 353 | static ssize_t aux1_store(struct device *dev, |
| 354 | struct device_attribute *dev_attr, |
| 355 | const char *buf, size_t count) |
| 356 | { |
| 357 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); |
| 358 | int value; |
| 359 | int result; |
| 360 | |
| 361 | /*Sanity check; should be a positive integer */ |
| 362 | if (!sscanf(buf, "%d", &value)) |
| 363 | return -EINVAL; |
| 364 | |
| 365 | if (value < 0) |
| 366 | return -EINVAL; |
| 367 | |
| 368 | result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value)); |
| 369 | return result ? result : count; |
| 370 | } |
| 371 | |
| 372 | /* BIOS can enable/disable the thermal user application in dabney platform */ |
| 373 | #define BIOS_ENABLED "\\_TZ.GSTS" |
| 374 | static ssize_t bios_enabled_show(struct device *dev, |
| 375 | struct device_attribute *attr, char *buf) |
| 376 | { |
| 377 | acpi_status status; |
| 378 | unsigned long bios_enabled; |
| 379 | |
| 380 | status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled); |
| 381 | if (ACPI_FAILURE(status)) |
| 382 | return -ENODEV; |
| 383 | |
| 384 | return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled"); |
| 385 | } |
| 386 | |
| 387 | static int intel_menlow_add_one_attribute(char *name, int mode, void *show, |
| 388 | void *store, struct device *dev, |
| 389 | acpi_handle handle) |
| 390 | { |
| 391 | struct intel_menlow_attribute *attr; |
| 392 | int result; |
| 393 | |
| 394 | attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL); |
| 395 | if (!attr) |
| 396 | return -ENOMEM; |
| 397 | |
| 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 | return result; |
| 408 | |
| 409 | mutex_lock(&intel_menlow_attr_lock); |
| 410 | list_add_tail(&attr->node, &intel_menlow_attr_list); |
| 411 | mutex_unlock(&intel_menlow_attr_lock); |
| 412 | |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl, |
| 417 | void *context, void **rv) |
| 418 | { |
| 419 | acpi_status status; |
| 420 | acpi_handle dummy; |
| 421 | struct thermal_zone_device *thermal; |
| 422 | int result; |
| 423 | |
| 424 | result = acpi_bus_get_private_data(handle, (void **)&thermal); |
| 425 | if (result) |
| 426 | return 0; |
| 427 | |
| 428 | /* _TZ must have the AUX0/1 methods */ |
| 429 | status = acpi_get_handle(handle, GET_AUX0, &dummy); |
| 430 | if (ACPI_FAILURE(status)) |
| 431 | goto not_found; |
| 432 | |
| 433 | status = acpi_get_handle(handle, SET_AUX0, &dummy); |
| 434 | if (ACPI_FAILURE(status)) |
| 435 | goto not_found; |
| 436 | |
| 437 | result = intel_menlow_add_one_attribute("aux0", 0644, |
| 438 | aux0_show, aux0_store, |
| 439 | &thermal->device, handle); |
| 440 | if (result) |
| 441 | return AE_ERROR; |
| 442 | |
| 443 | status = acpi_get_handle(handle, GET_AUX1, &dummy); |
| 444 | if (ACPI_FAILURE(status)) |
| 445 | goto not_found; |
| 446 | |
| 447 | status = acpi_get_handle(handle, SET_AUX1, &dummy); |
| 448 | if (ACPI_FAILURE(status)) |
| 449 | goto not_found; |
| 450 | |
| 451 | result = intel_menlow_add_one_attribute("aux1", 0644, |
| 452 | aux1_show, aux1_store, |
| 453 | &thermal->device, handle); |
| 454 | if (result) |
| 455 | return AE_ERROR; |
| 456 | |
| 457 | /* |
| 458 | * create the "dabney_enabled" attribute which means the user app |
| 459 | * should be loaded or not |
| 460 | */ |
| 461 | |
| 462 | result = intel_menlow_add_one_attribute("bios_enabled", 0444, |
| 463 | bios_enabled_show, NULL, |
| 464 | &thermal->device, handle); |
| 465 | if (result) |
| 466 | return AE_ERROR; |
| 467 | |
| 468 | not_found: |
| 469 | if (status == AE_NOT_FOUND) |
| 470 | return AE_OK; |
| 471 | else |
| 472 | return status; |
| 473 | } |
| 474 | |
| 475 | static void intel_menlow_unregister_sensor(void) |
| 476 | { |
| 477 | struct intel_menlow_attribute *pos, *next; |
| 478 | |
| 479 | mutex_lock(&intel_menlow_attr_lock); |
| 480 | list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) { |
| 481 | list_del(&pos->node); |
| 482 | device_remove_file(pos->device, &pos->attr); |
| 483 | kfree(pos); |
| 484 | } |
| 485 | mutex_unlock(&intel_menlow_attr_lock); |
| 486 | |
| 487 | return; |
| 488 | } |
| 489 | |
| 490 | static int __init intel_menlow_module_init(void) |
| 491 | { |
| 492 | int result = -ENODEV; |
| 493 | acpi_status status; |
| 494 | unsigned long enable; |
| 495 | |
| 496 | if (acpi_disabled) |
| 497 | return result; |
| 498 | |
| 499 | /* Looking for the \_TZ.GSTS method */ |
| 500 | status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable); |
| 501 | if (ACPI_FAILURE(status) || !enable) |
| 502 | return -ENODEV; |
| 503 | |
| 504 | /* Looking for ACPI device MEM0 with hardware id INT0002 */ |
| 505 | result = acpi_bus_register_driver(&intel_menlow_memory_driver); |
| 506 | if (result) |
| 507 | return result; |
| 508 | |
| 509 | /* Looking for sensors in each ACPI thermal zone */ |
| 510 | status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT, |
| 511 | ACPI_UINT32_MAX, |
| 512 | intel_menlow_register_sensor, NULL, NULL); |
| 513 | if (ACPI_FAILURE(status)) |
| 514 | return -ENODEV; |
| 515 | |
| 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | static void __exit intel_menlow_module_exit(void) |
| 520 | { |
| 521 | acpi_bus_unregister_driver(&intel_menlow_memory_driver); |
| 522 | intel_menlow_unregister_sensor(); |
| 523 | } |
| 524 | |
| 525 | module_init(intel_menlow_module_init); |
| 526 | module_exit(intel_menlow_module_exit); |