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cc0573b3 TS |
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 | ||
4686f6df JP |
30 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
31 | ||
cc0573b3 TS |
32 | #include <linux/kernel.h> |
33 | #include <linux/module.h> | |
34 | #include <linux/init.h> | |
5a0e3ad6 | 35 | #include <linux/slab.h> |
cc0573b3 TS |
36 | #include <linux/types.h> |
37 | #include <linux/pci.h> | |
38 | #include <linux/pm.h> | |
cc0573b3 | 39 | #include <linux/thermal.h> |
8b48463f | 40 | #include <linux/acpi.h> |
cc0573b3 TS |
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 | ||
4b30fbca AL |
56 | static void intel_menlow_unregister_sensor(void); |
57 | ||
d65dcdcf TS |
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 | */ | |
6503e5df MG |
63 | static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev, |
64 | unsigned long *max_state) | |
cc0573b3 TS |
65 | { |
66 | struct acpi_device *device = cdev->devdata; | |
67 | acpi_handle handle = device->handle; | |
27663c58 | 68 | unsigned long long value; |
cc0573b3 TS |
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 | ||
c2d06fe3 ZR |
82 | if (!value) |
83 | return -EINVAL; | |
84 | ||
cc0573b3 TS |
85 | *max_state = value - 1; |
86 | return 0; | |
87 | } | |
88 | ||
cc0573b3 | 89 | static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev, |
6503e5df | 90 | unsigned long *value) |
cc0573b3 TS |
91 | { |
92 | struct acpi_device *device = cdev->devdata; | |
93 | acpi_handle handle = device->handle; | |
6503e5df | 94 | unsigned long long result; |
cc0573b3 TS |
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, | |
6503e5df | 104 | &arg_list, &result); |
cc0573b3 TS |
105 | if (ACPI_FAILURE(status)) |
106 | return -EFAULT; | |
107 | ||
6503e5df MG |
108 | *value = result; |
109 | return 0; | |
cc0573b3 TS |
110 | } |
111 | ||
112 | static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev, | |
6503e5df | 113 | unsigned long state) |
cc0573b3 TS |
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; | |
27663c58 | 120 | unsigned long long temp; |
cc0573b3 TS |
121 | unsigned long max_state; |
122 | ||
6503e5df | 123 | if (memory_get_max_bandwidth(cdev, &max_state)) |
cc0573b3 TS |
124 | return -EFAULT; |
125 | ||
c2d06fe3 | 126 | if (state > max_state) |
cc0573b3 TS |
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, | |
27663c58 | 136 | &temp); |
cc0573b3 | 137 | |
4686f6df | 138 | pr_info("Bandwidth value was %ld: status is %d\n", state, status); |
cc0573b3 TS |
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; | |
cc0573b3 TS |
157 | struct thermal_cooling_device *cdev; |
158 | ||
159 | if (!device) | |
160 | return -EINVAL; | |
161 | ||
70122e3d | 162 | if (!acpi_has_method(device->handle, MEMORY_GET_BANDWIDTH)) |
cc0573b3 TS |
163 | goto end; |
164 | ||
70122e3d | 165 | if (!acpi_has_method(device->handle, MEMORY_SET_BANDWIDTH)) |
cc0573b3 TS |
166 | goto end; |
167 | ||
168 | cdev = thermal_cooling_device_register("Memory controller", device, | |
169 | &memory_cooling_ops); | |
69f6b8dd TS |
170 | if (IS_ERR(cdev)) { |
171 | result = PTR_ERR(cdev); | |
172 | goto end; | |
173 | } | |
174 | ||
db89b4f0 | 175 | device->driver_data = cdev; |
3a8ca95e JL |
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; | |
cc0573b3 TS |
186 | } |
187 | ||
188 | end: | |
189 | return result; | |
190 | ||
191 | unregister: | |
192 | thermal_cooling_device_unregister(cdev); | |
193 | return result; | |
194 | ||
195 | } | |
196 | ||
51fac838 | 197 | static int intel_menlow_memory_remove(struct acpi_device *device) |
cc0573b3 TS |
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 | ||
f7e8dd50 | 211 | static const struct acpi_device_id intel_menlow_memory_ids[] = { |
cc0573b3 TS |
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 | */ | |
27663c58 MW |
252 | static int sensor_get_auxtrip(acpi_handle handle, int index, |
253 | unsigned long long *value) | |
cc0573b3 TS |
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, | |
27663c58 | 261 | NULL, value); |
cc0573b3 TS |
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 | }; | |
27663c58 | 283 | unsigned long long temp; |
cc0573b3 TS |
284 | |
285 | if (index != 0 && index != 1) | |
286 | return -EINVAL; | |
287 | ||
288 | status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1, | |
27663c58 | 289 | NULL, &temp); |
cc0573b3 TS |
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, | |
27663c58 | 297 | &args, &temp); |
cc0573b3 TS |
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); | |
27663c58 | 313 | unsigned long long value; |
cc0573b3 TS |
314 | int result; |
315 | ||
316 | result = sensor_get_auxtrip(attr->handle, 0, &value); | |
317 | ||
e866a2e3 | 318 | return result ? result : sprintf(buf, "%lu", DECI_KELVIN_TO_CELSIUS(value)); |
cc0573b3 TS |
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); | |
27663c58 | 325 | unsigned long long value; |
cc0573b3 TS |
326 | int result; |
327 | ||
328 | result = sensor_get_auxtrip(attr->handle, 1, &value); | |
329 | ||
e866a2e3 | 330 | return result ? result : sprintf(buf, "%lu", DECI_KELVIN_TO_CELSIUS(value)); |
cc0573b3 TS |
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 | ||
e866a2e3 | 348 | result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_DECI_KELVIN(value)); |
cc0573b3 TS |
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 | ||
e866a2e3 | 367 | result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_DECI_KELVIN(value)); |
cc0573b3 TS |
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; | |
27663c58 | 377 | unsigned long long bios_enabled; |
cc0573b3 TS |
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 | ||
9104e427 | 386 | static int intel_menlow_add_one_attribute(char *name, umode_t mode, void *show, |
cc0573b3 TS |
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 | ||
12765517 | 397 | sysfs_attr_init(&attr->attr.attr); /* That is consistent naming :D */ |
cc0573b3 TS |
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); | |
4b30fbca AL |
406 | if (result) { |
407 | kfree(attr); | |
cc0573b3 | 408 | return result; |
4b30fbca | 409 | } |
cc0573b3 TS |
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)) | |
4b30fbca | 433 | return (status == AE_NOT_FOUND) ? AE_OK : status; |
cc0573b3 TS |
434 | |
435 | status = acpi_get_handle(handle, SET_AUX0, &dummy); | |
436 | if (ACPI_FAILURE(status)) | |
4b30fbca | 437 | return (status == AE_NOT_FOUND) ? AE_OK : status; |
cc0573b3 TS |
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)) | |
4b30fbca | 447 | goto aux1_not_found; |
cc0573b3 TS |
448 | |
449 | status = acpi_get_handle(handle, SET_AUX1, &dummy); | |
450 | if (ACPI_FAILURE(status)) | |
4b30fbca | 451 | goto aux1_not_found; |
cc0573b3 TS |
452 | |
453 | result = intel_menlow_add_one_attribute("aux1", 0644, | |
454 | aux1_show, aux1_store, | |
455 | &thermal->device, handle); | |
4b30fbca AL |
456 | if (result) { |
457 | intel_menlow_unregister_sensor(); | |
cc0573b3 | 458 | return AE_ERROR; |
4b30fbca | 459 | } |
cc0573b3 TS |
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); | |
4b30fbca AL |
469 | if (result) { |
470 | intel_menlow_unregister_sensor(); | |
cc0573b3 | 471 | return AE_ERROR; |
4b30fbca | 472 | } |
cc0573b3 | 473 | |
c8bb2ebd AL |
474 | return AE_OK; |
475 | ||
4b30fbca | 476 | aux1_not_found: |
cc0573b3 TS |
477 | if (status == AE_NOT_FOUND) |
478 | return AE_OK; | |
4b30fbca AL |
479 | |
480 | intel_menlow_unregister_sensor(); | |
481 | return status; | |
cc0573b3 TS |
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; | |
27663c58 | 503 | unsigned long long enable; |
cc0573b3 TS |
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, | |
2263576c | 521 | intel_menlow_register_sensor, NULL, NULL, NULL); |
4b30fbca AL |
522 | if (ACPI_FAILURE(status)) { |
523 | acpi_bus_unregister_driver(&intel_menlow_memory_driver); | |
cc0573b3 | 524 | return -ENODEV; |
4b30fbca | 525 | } |
cc0573b3 TS |
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); |