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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 | ||
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 | ||
d65dcdcf TS |
55 | /* |
56 | * GTHS returning 'n' would mean that [0,n-1] states are supported | |
57 | * In that case max_cstate would be n-1 | |
58 | * GTHS returning '0' would mean that no bandwidth control states are supported | |
59 | */ | |
cc0573b3 TS |
60 | static int memory_get_int_max_bandwidth(struct thermal_cooling_device *cdev, |
61 | unsigned long *max_state) | |
62 | { | |
63 | struct acpi_device *device = cdev->devdata; | |
64 | acpi_handle handle = device->handle; | |
27663c58 | 65 | unsigned long long value; |
cc0573b3 TS |
66 | struct acpi_object_list arg_list; |
67 | union acpi_object arg; | |
68 | acpi_status status = AE_OK; | |
69 | ||
70 | arg_list.count = 1; | |
71 | arg_list.pointer = &arg; | |
72 | arg.type = ACPI_TYPE_INTEGER; | |
73 | arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH; | |
74 | status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH, | |
75 | &arg_list, &value); | |
76 | if (ACPI_FAILURE(status)) | |
77 | return -EFAULT; | |
78 | ||
c2d06fe3 ZR |
79 | if (!value) |
80 | return -EINVAL; | |
81 | ||
cc0573b3 TS |
82 | *max_state = value - 1; |
83 | return 0; | |
84 | } | |
85 | ||
86 | static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev, | |
87 | char *buf) | |
88 | { | |
89 | unsigned long value; | |
90 | if (memory_get_int_max_bandwidth(cdev, &value)) | |
91 | return -EINVAL; | |
92 | ||
93 | return sprintf(buf, "%ld\n", value); | |
94 | } | |
95 | ||
96 | static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev, | |
97 | char *buf) | |
98 | { | |
99 | struct acpi_device *device = cdev->devdata; | |
100 | acpi_handle handle = device->handle; | |
27663c58 | 101 | unsigned long long value; |
cc0573b3 TS |
102 | struct acpi_object_list arg_list; |
103 | union acpi_object arg; | |
104 | acpi_status status = AE_OK; | |
105 | ||
106 | arg_list.count = 1; | |
107 | arg_list.pointer = &arg; | |
108 | arg.type = ACPI_TYPE_INTEGER; | |
109 | arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH; | |
110 | status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH, | |
111 | &arg_list, &value); | |
112 | if (ACPI_FAILURE(status)) | |
113 | return -EFAULT; | |
114 | ||
eb83f493 | 115 | return sprintf(buf, "%llu\n", value); |
cc0573b3 TS |
116 | } |
117 | ||
118 | static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev, | |
119 | unsigned int state) | |
120 | { | |
121 | struct acpi_device *device = cdev->devdata; | |
122 | acpi_handle handle = device->handle; | |
123 | struct acpi_object_list arg_list; | |
124 | union acpi_object arg; | |
125 | acpi_status status; | |
27663c58 | 126 | unsigned long long temp; |
cc0573b3 TS |
127 | unsigned long max_state; |
128 | ||
129 | if (memory_get_int_max_bandwidth(cdev, &max_state)) | |
130 | return -EFAULT; | |
131 | ||
c2d06fe3 | 132 | if (state > max_state) |
cc0573b3 TS |
133 | return -EINVAL; |
134 | ||
135 | arg_list.count = 1; | |
136 | arg_list.pointer = &arg; | |
137 | arg.type = ACPI_TYPE_INTEGER; | |
138 | arg.integer.value = state; | |
139 | ||
140 | status = | |
141 | acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list, | |
27663c58 | 142 | &temp); |
cc0573b3 TS |
143 | |
144 | printk(KERN_INFO | |
145 | "Bandwidth value was %d: status is %d\n", state, status); | |
146 | if (ACPI_FAILURE(status)) | |
147 | return -EFAULT; | |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | static struct thermal_cooling_device_ops memory_cooling_ops = { | |
153 | .get_max_state = memory_get_max_bandwidth, | |
154 | .get_cur_state = memory_get_cur_bandwidth, | |
155 | .set_cur_state = memory_set_cur_bandwidth, | |
156 | }; | |
157 | ||
158 | /* | |
159 | * Memory Device Management | |
160 | */ | |
161 | static int intel_menlow_memory_add(struct acpi_device *device) | |
162 | { | |
163 | int result = -ENODEV; | |
164 | acpi_status status = AE_OK; | |
165 | acpi_handle dummy; | |
166 | struct thermal_cooling_device *cdev; | |
167 | ||
168 | if (!device) | |
169 | return -EINVAL; | |
170 | ||
171 | status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy); | |
172 | if (ACPI_FAILURE(status)) | |
173 | goto end; | |
174 | ||
175 | status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy); | |
176 | if (ACPI_FAILURE(status)) | |
177 | goto end; | |
178 | ||
179 | cdev = thermal_cooling_device_register("Memory controller", device, | |
180 | &memory_cooling_ops); | |
69f6b8dd TS |
181 | if (IS_ERR(cdev)) { |
182 | result = PTR_ERR(cdev); | |
183 | goto end; | |
184 | } | |
185 | ||
db89b4f0 | 186 | device->driver_data = cdev; |
3a8ca95e JL |
187 | result = sysfs_create_link(&device->dev.kobj, |
188 | &cdev->device.kobj, "thermal_cooling"); | |
189 | if (result) | |
190 | goto unregister; | |
191 | ||
192 | result = sysfs_create_link(&cdev->device.kobj, | |
193 | &device->dev.kobj, "device"); | |
194 | if (result) { | |
195 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); | |
196 | goto unregister; | |
cc0573b3 TS |
197 | } |
198 | ||
199 | end: | |
200 | return result; | |
201 | ||
202 | unregister: | |
203 | thermal_cooling_device_unregister(cdev); | |
204 | return result; | |
205 | ||
206 | } | |
207 | ||
208 | static int intel_menlow_memory_remove(struct acpi_device *device, int type) | |
209 | { | |
210 | struct thermal_cooling_device *cdev = acpi_driver_data(device); | |
211 | ||
212 | if (!device || !cdev) | |
213 | return -EINVAL; | |
214 | ||
215 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); | |
216 | sysfs_remove_link(&cdev->device.kobj, "device"); | |
217 | thermal_cooling_device_unregister(cdev); | |
218 | ||
219 | return 0; | |
220 | } | |
221 | ||
f7e8dd50 | 222 | static const struct acpi_device_id intel_menlow_memory_ids[] = { |
cc0573b3 TS |
223 | {"INT0002", 0}, |
224 | {"", 0}, | |
225 | }; | |
226 | ||
227 | static struct acpi_driver intel_menlow_memory_driver = { | |
228 | .name = "intel_menlow_thermal_control", | |
229 | .ids = intel_menlow_memory_ids, | |
230 | .ops = { | |
231 | .add = intel_menlow_memory_add, | |
232 | .remove = intel_menlow_memory_remove, | |
233 | }, | |
234 | }; | |
235 | ||
236 | /* | |
237 | * Sensor control on menlow platform | |
238 | */ | |
239 | ||
240 | #define THERMAL_AUX0 0 | |
241 | #define THERMAL_AUX1 1 | |
242 | #define GET_AUX0 "GAX0" | |
243 | #define GET_AUX1 "GAX1" | |
244 | #define SET_AUX0 "SAX0" | |
245 | #define SET_AUX1 "SAX1" | |
246 | ||
247 | struct intel_menlow_attribute { | |
248 | struct device_attribute attr; | |
249 | struct device *device; | |
250 | acpi_handle handle; | |
251 | struct list_head node; | |
252 | }; | |
253 | ||
254 | static LIST_HEAD(intel_menlow_attr_list); | |
255 | static DEFINE_MUTEX(intel_menlow_attr_lock); | |
256 | ||
257 | /* | |
258 | * sensor_get_auxtrip - get the current auxtrip value from sensor | |
259 | * @name: Thermalzone name | |
260 | * @auxtype : AUX0/AUX1 | |
261 | * @buf: syfs buffer | |
262 | */ | |
27663c58 MW |
263 | static int sensor_get_auxtrip(acpi_handle handle, int index, |
264 | unsigned long long *value) | |
cc0573b3 TS |
265 | { |
266 | acpi_status status; | |
267 | ||
268 | if ((index != 0 && index != 1) || !value) | |
269 | return -EINVAL; | |
270 | ||
271 | status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0, | |
27663c58 | 272 | NULL, value); |
cc0573b3 TS |
273 | if (ACPI_FAILURE(status)) |
274 | return -EIO; | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | /* | |
280 | * sensor_set_auxtrip - set the new auxtrip value to sensor | |
281 | * @name: Thermalzone name | |
282 | * @auxtype : AUX0/AUX1 | |
283 | * @buf: syfs buffer | |
284 | */ | |
285 | static int sensor_set_auxtrip(acpi_handle handle, int index, int value) | |
286 | { | |
287 | acpi_status status; | |
288 | union acpi_object arg = { | |
289 | ACPI_TYPE_INTEGER | |
290 | }; | |
291 | struct acpi_object_list args = { | |
292 | 1, &arg | |
293 | }; | |
27663c58 | 294 | unsigned long long temp; |
cc0573b3 TS |
295 | |
296 | if (index != 0 && index != 1) | |
297 | return -EINVAL; | |
298 | ||
299 | status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1, | |
27663c58 | 300 | NULL, &temp); |
cc0573b3 TS |
301 | if (ACPI_FAILURE(status)) |
302 | return -EIO; | |
303 | if ((index && value < temp) || (!index && value > temp)) | |
304 | return -EINVAL; | |
305 | ||
306 | arg.integer.value = value; | |
307 | status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0, | |
27663c58 | 308 | &args, &temp); |
cc0573b3 TS |
309 | if (ACPI_FAILURE(status)) |
310 | return -EIO; | |
311 | ||
312 | /* do we need to check the return value of SAX0/SAX1 ? */ | |
313 | ||
314 | return 0; | |
315 | } | |
316 | ||
317 | #define to_intel_menlow_attr(_attr) \ | |
318 | container_of(_attr, struct intel_menlow_attribute, attr) | |
319 | ||
320 | static ssize_t aux0_show(struct device *dev, | |
321 | struct device_attribute *dev_attr, char *buf) | |
322 | { | |
323 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); | |
27663c58 | 324 | unsigned long long value; |
cc0573b3 TS |
325 | int result; |
326 | ||
327 | result = sensor_get_auxtrip(attr->handle, 0, &value); | |
328 | ||
329 | return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value)); | |
330 | } | |
331 | ||
332 | static ssize_t aux1_show(struct device *dev, | |
333 | struct device_attribute *dev_attr, char *buf) | |
334 | { | |
335 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); | |
27663c58 | 336 | unsigned long long value; |
cc0573b3 TS |
337 | int result; |
338 | ||
339 | result = sensor_get_auxtrip(attr->handle, 1, &value); | |
340 | ||
341 | return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value)); | |
342 | } | |
343 | ||
344 | static ssize_t aux0_store(struct device *dev, | |
345 | struct device_attribute *dev_attr, | |
346 | const char *buf, size_t count) | |
347 | { | |
348 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); | |
349 | int value; | |
350 | int result; | |
351 | ||
352 | /*Sanity check; should be a positive integer */ | |
353 | if (!sscanf(buf, "%d", &value)) | |
354 | return -EINVAL; | |
355 | ||
356 | if (value < 0) | |
357 | return -EINVAL; | |
358 | ||
359 | result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value)); | |
360 | return result ? result : count; | |
361 | } | |
362 | ||
363 | static ssize_t aux1_store(struct device *dev, | |
364 | struct device_attribute *dev_attr, | |
365 | const char *buf, size_t count) | |
366 | { | |
367 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); | |
368 | int value; | |
369 | int result; | |
370 | ||
371 | /*Sanity check; should be a positive integer */ | |
372 | if (!sscanf(buf, "%d", &value)) | |
373 | return -EINVAL; | |
374 | ||
375 | if (value < 0) | |
376 | return -EINVAL; | |
377 | ||
378 | result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value)); | |
379 | return result ? result : count; | |
380 | } | |
381 | ||
382 | /* BIOS can enable/disable the thermal user application in dabney platform */ | |
383 | #define BIOS_ENABLED "\\_TZ.GSTS" | |
384 | static ssize_t bios_enabled_show(struct device *dev, | |
385 | struct device_attribute *attr, char *buf) | |
386 | { | |
387 | acpi_status status; | |
27663c58 | 388 | unsigned long long bios_enabled; |
cc0573b3 TS |
389 | |
390 | status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled); | |
391 | if (ACPI_FAILURE(status)) | |
392 | return -ENODEV; | |
393 | ||
394 | return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled"); | |
395 | } | |
396 | ||
397 | static int intel_menlow_add_one_attribute(char *name, int mode, void *show, | |
398 | void *store, struct device *dev, | |
399 | acpi_handle handle) | |
400 | { | |
401 | struct intel_menlow_attribute *attr; | |
402 | int result; | |
403 | ||
404 | attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL); | |
405 | if (!attr) | |
406 | return -ENOMEM; | |
407 | ||
408 | attr->attr.attr.name = name; | |
409 | attr->attr.attr.mode = mode; | |
410 | attr->attr.show = show; | |
411 | attr->attr.store = store; | |
412 | attr->device = dev; | |
413 | attr->handle = handle; | |
414 | ||
415 | result = device_create_file(dev, &attr->attr); | |
416 | if (result) | |
417 | return result; | |
418 | ||
419 | mutex_lock(&intel_menlow_attr_lock); | |
420 | list_add_tail(&attr->node, &intel_menlow_attr_list); | |
421 | mutex_unlock(&intel_menlow_attr_lock); | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl, | |
427 | void *context, void **rv) | |
428 | { | |
429 | acpi_status status; | |
430 | acpi_handle dummy; | |
431 | struct thermal_zone_device *thermal; | |
432 | int result; | |
433 | ||
434 | result = acpi_bus_get_private_data(handle, (void **)&thermal); | |
435 | if (result) | |
436 | return 0; | |
437 | ||
438 | /* _TZ must have the AUX0/1 methods */ | |
439 | status = acpi_get_handle(handle, GET_AUX0, &dummy); | |
440 | if (ACPI_FAILURE(status)) | |
441 | goto not_found; | |
442 | ||
443 | status = acpi_get_handle(handle, SET_AUX0, &dummy); | |
444 | if (ACPI_FAILURE(status)) | |
445 | goto not_found; | |
446 | ||
447 | result = intel_menlow_add_one_attribute("aux0", 0644, | |
448 | aux0_show, aux0_store, | |
449 | &thermal->device, handle); | |
450 | if (result) | |
451 | return AE_ERROR; | |
452 | ||
453 | status = acpi_get_handle(handle, GET_AUX1, &dummy); | |
454 | if (ACPI_FAILURE(status)) | |
455 | goto not_found; | |
456 | ||
457 | status = acpi_get_handle(handle, SET_AUX1, &dummy); | |
458 | if (ACPI_FAILURE(status)) | |
459 | goto not_found; | |
460 | ||
461 | result = intel_menlow_add_one_attribute("aux1", 0644, | |
462 | aux1_show, aux1_store, | |
463 | &thermal->device, handle); | |
464 | if (result) | |
465 | return AE_ERROR; | |
466 | ||
467 | /* | |
468 | * create the "dabney_enabled" attribute which means the user app | |
469 | * should be loaded or not | |
470 | */ | |
471 | ||
472 | result = intel_menlow_add_one_attribute("bios_enabled", 0444, | |
473 | bios_enabled_show, NULL, | |
474 | &thermal->device, handle); | |
475 | if (result) | |
476 | return AE_ERROR; | |
477 | ||
478 | not_found: | |
479 | if (status == AE_NOT_FOUND) | |
480 | return AE_OK; | |
481 | else | |
482 | return status; | |
483 | } | |
484 | ||
485 | static void intel_menlow_unregister_sensor(void) | |
486 | { | |
487 | struct intel_menlow_attribute *pos, *next; | |
488 | ||
489 | mutex_lock(&intel_menlow_attr_lock); | |
490 | list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) { | |
491 | list_del(&pos->node); | |
492 | device_remove_file(pos->device, &pos->attr); | |
493 | kfree(pos); | |
494 | } | |
495 | mutex_unlock(&intel_menlow_attr_lock); | |
496 | ||
497 | return; | |
498 | } | |
499 | ||
500 | static int __init intel_menlow_module_init(void) | |
501 | { | |
502 | int result = -ENODEV; | |
503 | acpi_status status; | |
27663c58 | 504 | unsigned long long enable; |
cc0573b3 TS |
505 | |
506 | if (acpi_disabled) | |
507 | return result; | |
508 | ||
509 | /* Looking for the \_TZ.GSTS method */ | |
510 | status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable); | |
511 | if (ACPI_FAILURE(status) || !enable) | |
512 | return -ENODEV; | |
513 | ||
514 | /* Looking for ACPI device MEM0 with hardware id INT0002 */ | |
515 | result = acpi_bus_register_driver(&intel_menlow_memory_driver); | |
516 | if (result) | |
517 | return result; | |
518 | ||
519 | /* Looking for sensors in each ACPI thermal zone */ | |
520 | status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT, | |
521 | ACPI_UINT32_MAX, | |
522 | intel_menlow_register_sensor, NULL, NULL); | |
523 | if (ACPI_FAILURE(status)) | |
524 | return -ENODEV; | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | static void __exit intel_menlow_module_exit(void) | |
530 | { | |
531 | acpi_bus_unregister_driver(&intel_menlow_memory_driver); | |
532 | intel_menlow_unregister_sensor(); | |
533 | } | |
534 | ||
535 | module_init(intel_menlow_module_init); | |
536 | module_exit(intel_menlow_module_exit); |