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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 | */ | |
6503e5df MG |
60 | static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev, |
61 | unsigned long *max_state) | |
cc0573b3 TS |
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 | ||
cc0573b3 | 86 | static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev, |
6503e5df | 87 | unsigned long *value) |
cc0573b3 TS |
88 | { |
89 | struct acpi_device *device = cdev->devdata; | |
90 | acpi_handle handle = device->handle; | |
6503e5df | 91 | unsigned long long result; |
cc0573b3 TS |
92 | struct acpi_object_list arg_list; |
93 | union acpi_object arg; | |
94 | acpi_status status = AE_OK; | |
95 | ||
96 | arg_list.count = 1; | |
97 | arg_list.pointer = &arg; | |
98 | arg.type = ACPI_TYPE_INTEGER; | |
99 | arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH; | |
100 | status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH, | |
6503e5df | 101 | &arg_list, &result); |
cc0573b3 TS |
102 | if (ACPI_FAILURE(status)) |
103 | return -EFAULT; | |
104 | ||
6503e5df MG |
105 | *value = result; |
106 | return 0; | |
cc0573b3 TS |
107 | } |
108 | ||
109 | static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev, | |
6503e5df | 110 | unsigned long state) |
cc0573b3 TS |
111 | { |
112 | struct acpi_device *device = cdev->devdata; | |
113 | acpi_handle handle = device->handle; | |
114 | struct acpi_object_list arg_list; | |
115 | union acpi_object arg; | |
116 | acpi_status status; | |
27663c58 | 117 | unsigned long long temp; |
cc0573b3 TS |
118 | unsigned long max_state; |
119 | ||
6503e5df | 120 | if (memory_get_max_bandwidth(cdev, &max_state)) |
cc0573b3 TS |
121 | return -EFAULT; |
122 | ||
c2d06fe3 | 123 | if (state > max_state) |
cc0573b3 TS |
124 | return -EINVAL; |
125 | ||
126 | arg_list.count = 1; | |
127 | arg_list.pointer = &arg; | |
128 | arg.type = ACPI_TYPE_INTEGER; | |
129 | arg.integer.value = state; | |
130 | ||
131 | status = | |
132 | acpi_evaluate_integer(handle, MEMORY_SET_BANDWIDTH, &arg_list, | |
27663c58 | 133 | &temp); |
cc0573b3 TS |
134 | |
135 | printk(KERN_INFO | |
6503e5df | 136 | "Bandwidth value was %ld: status is %d\n", state, status); |
cc0573b3 TS |
137 | if (ACPI_FAILURE(status)) |
138 | return -EFAULT; | |
139 | ||
140 | return 0; | |
141 | } | |
142 | ||
143 | static struct thermal_cooling_device_ops memory_cooling_ops = { | |
144 | .get_max_state = memory_get_max_bandwidth, | |
145 | .get_cur_state = memory_get_cur_bandwidth, | |
146 | .set_cur_state = memory_set_cur_bandwidth, | |
147 | }; | |
148 | ||
149 | /* | |
150 | * Memory Device Management | |
151 | */ | |
152 | static int intel_menlow_memory_add(struct acpi_device *device) | |
153 | { | |
154 | int result = -ENODEV; | |
155 | acpi_status status = AE_OK; | |
156 | acpi_handle dummy; | |
157 | struct thermal_cooling_device *cdev; | |
158 | ||
159 | if (!device) | |
160 | return -EINVAL; | |
161 | ||
162 | status = acpi_get_handle(device->handle, MEMORY_GET_BANDWIDTH, &dummy); | |
163 | if (ACPI_FAILURE(status)) | |
164 | goto end; | |
165 | ||
166 | status = acpi_get_handle(device->handle, MEMORY_SET_BANDWIDTH, &dummy); | |
167 | if (ACPI_FAILURE(status)) | |
168 | goto end; | |
169 | ||
170 | cdev = thermal_cooling_device_register("Memory controller", device, | |
171 | &memory_cooling_ops); | |
69f6b8dd TS |
172 | if (IS_ERR(cdev)) { |
173 | result = PTR_ERR(cdev); | |
174 | goto end; | |
175 | } | |
176 | ||
db89b4f0 | 177 | device->driver_data = cdev; |
3a8ca95e JL |
178 | result = sysfs_create_link(&device->dev.kobj, |
179 | &cdev->device.kobj, "thermal_cooling"); | |
180 | if (result) | |
181 | goto unregister; | |
182 | ||
183 | result = sysfs_create_link(&cdev->device.kobj, | |
184 | &device->dev.kobj, "device"); | |
185 | if (result) { | |
186 | sysfs_remove_link(&device->dev.kobj, "thermal_cooling"); | |
187 | goto unregister; | |
cc0573b3 TS |
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 | ||
f7e8dd50 | 213 | static const struct acpi_device_id intel_menlow_memory_ids[] = { |
cc0573b3 TS |
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 | */ | |
27663c58 MW |
254 | static int sensor_get_auxtrip(acpi_handle handle, int index, |
255 | unsigned long long *value) | |
cc0573b3 TS |
256 | { |
257 | acpi_status status; | |
258 | ||
259 | if ((index != 0 && index != 1) || !value) | |
260 | return -EINVAL; | |
261 | ||
262 | status = acpi_evaluate_integer(handle, index ? GET_AUX1 : GET_AUX0, | |
27663c58 | 263 | NULL, value); |
cc0573b3 TS |
264 | if (ACPI_FAILURE(status)) |
265 | return -EIO; | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | /* | |
271 | * sensor_set_auxtrip - set the new auxtrip value to sensor | |
272 | * @name: Thermalzone name | |
273 | * @auxtype : AUX0/AUX1 | |
274 | * @buf: syfs buffer | |
275 | */ | |
276 | static int sensor_set_auxtrip(acpi_handle handle, int index, int value) | |
277 | { | |
278 | acpi_status status; | |
279 | union acpi_object arg = { | |
280 | ACPI_TYPE_INTEGER | |
281 | }; | |
282 | struct acpi_object_list args = { | |
283 | 1, &arg | |
284 | }; | |
27663c58 | 285 | unsigned long long temp; |
cc0573b3 TS |
286 | |
287 | if (index != 0 && index != 1) | |
288 | return -EINVAL; | |
289 | ||
290 | status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1, | |
27663c58 | 291 | NULL, &temp); |
cc0573b3 TS |
292 | if (ACPI_FAILURE(status)) |
293 | return -EIO; | |
294 | if ((index && value < temp) || (!index && value > temp)) | |
295 | return -EINVAL; | |
296 | ||
297 | arg.integer.value = value; | |
298 | status = acpi_evaluate_integer(handle, index ? SET_AUX1 : SET_AUX0, | |
27663c58 | 299 | &args, &temp); |
cc0573b3 TS |
300 | if (ACPI_FAILURE(status)) |
301 | return -EIO; | |
302 | ||
303 | /* do we need to check the return value of SAX0/SAX1 ? */ | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | #define to_intel_menlow_attr(_attr) \ | |
309 | container_of(_attr, struct intel_menlow_attribute, attr) | |
310 | ||
311 | static ssize_t aux0_show(struct device *dev, | |
312 | struct device_attribute *dev_attr, char *buf) | |
313 | { | |
314 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); | |
27663c58 | 315 | unsigned long long value; |
cc0573b3 TS |
316 | int result; |
317 | ||
318 | result = sensor_get_auxtrip(attr->handle, 0, &value); | |
319 | ||
320 | return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value)); | |
321 | } | |
322 | ||
323 | static ssize_t aux1_show(struct device *dev, | |
324 | struct device_attribute *dev_attr, char *buf) | |
325 | { | |
326 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); | |
27663c58 | 327 | unsigned long long value; |
cc0573b3 TS |
328 | int result; |
329 | ||
330 | result = sensor_get_auxtrip(attr->handle, 1, &value); | |
331 | ||
332 | return result ? result : sprintf(buf, "%lu", KELVIN_TO_CELSIUS(value)); | |
333 | } | |
334 | ||
335 | static ssize_t aux0_store(struct device *dev, | |
336 | struct device_attribute *dev_attr, | |
337 | const char *buf, size_t count) | |
338 | { | |
339 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); | |
340 | int value; | |
341 | int result; | |
342 | ||
343 | /*Sanity check; should be a positive integer */ | |
344 | if (!sscanf(buf, "%d", &value)) | |
345 | return -EINVAL; | |
346 | ||
347 | if (value < 0) | |
348 | return -EINVAL; | |
349 | ||
350 | result = sensor_set_auxtrip(attr->handle, 0, CELSIUS_TO_KELVIN(value)); | |
351 | return result ? result : count; | |
352 | } | |
353 | ||
354 | static ssize_t aux1_store(struct device *dev, | |
355 | struct device_attribute *dev_attr, | |
356 | const char *buf, size_t count) | |
357 | { | |
358 | struct intel_menlow_attribute *attr = to_intel_menlow_attr(dev_attr); | |
359 | int value; | |
360 | int result; | |
361 | ||
362 | /*Sanity check; should be a positive integer */ | |
363 | if (!sscanf(buf, "%d", &value)) | |
364 | return -EINVAL; | |
365 | ||
366 | if (value < 0) | |
367 | return -EINVAL; | |
368 | ||
369 | result = sensor_set_auxtrip(attr->handle, 1, CELSIUS_TO_KELVIN(value)); | |
370 | return result ? result : count; | |
371 | } | |
372 | ||
373 | /* BIOS can enable/disable the thermal user application in dabney platform */ | |
374 | #define BIOS_ENABLED "\\_TZ.GSTS" | |
375 | static ssize_t bios_enabled_show(struct device *dev, | |
376 | struct device_attribute *attr, char *buf) | |
377 | { | |
378 | acpi_status status; | |
27663c58 | 379 | unsigned long long bios_enabled; |
cc0573b3 TS |
380 | |
381 | status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &bios_enabled); | |
382 | if (ACPI_FAILURE(status)) | |
383 | return -ENODEV; | |
384 | ||
385 | return sprintf(buf, "%s\n", bios_enabled ? "enabled" : "disabled"); | |
386 | } | |
387 | ||
388 | static int intel_menlow_add_one_attribute(char *name, int mode, void *show, | |
389 | void *store, struct device *dev, | |
390 | acpi_handle handle) | |
391 | { | |
392 | struct intel_menlow_attribute *attr; | |
393 | int result; | |
394 | ||
395 | attr = kzalloc(sizeof(struct intel_menlow_attribute), GFP_KERNEL); | |
396 | if (!attr) | |
397 | return -ENOMEM; | |
398 | ||
399 | attr->attr.attr.name = name; | |
400 | attr->attr.attr.mode = mode; | |
401 | attr->attr.show = show; | |
402 | attr->attr.store = store; | |
403 | attr->device = dev; | |
404 | attr->handle = handle; | |
405 | ||
406 | result = device_create_file(dev, &attr->attr); | |
407 | if (result) | |
408 | return result; | |
409 | ||
410 | mutex_lock(&intel_menlow_attr_lock); | |
411 | list_add_tail(&attr->node, &intel_menlow_attr_list); | |
412 | mutex_unlock(&intel_menlow_attr_lock); | |
413 | ||
414 | return 0; | |
415 | } | |
416 | ||
417 | static acpi_status intel_menlow_register_sensor(acpi_handle handle, u32 lvl, | |
418 | void *context, void **rv) | |
419 | { | |
420 | acpi_status status; | |
421 | acpi_handle dummy; | |
422 | struct thermal_zone_device *thermal; | |
423 | int result; | |
424 | ||
425 | result = acpi_bus_get_private_data(handle, (void **)&thermal); | |
426 | if (result) | |
427 | return 0; | |
428 | ||
429 | /* _TZ must have the AUX0/1 methods */ | |
430 | status = acpi_get_handle(handle, GET_AUX0, &dummy); | |
431 | if (ACPI_FAILURE(status)) | |
432 | goto not_found; | |
433 | ||
434 | status = acpi_get_handle(handle, SET_AUX0, &dummy); | |
435 | if (ACPI_FAILURE(status)) | |
436 | goto not_found; | |
437 | ||
438 | result = intel_menlow_add_one_attribute("aux0", 0644, | |
439 | aux0_show, aux0_store, | |
440 | &thermal->device, handle); | |
441 | if (result) | |
442 | return AE_ERROR; | |
443 | ||
444 | status = acpi_get_handle(handle, GET_AUX1, &dummy); | |
445 | if (ACPI_FAILURE(status)) | |
446 | goto not_found; | |
447 | ||
448 | status = acpi_get_handle(handle, SET_AUX1, &dummy); | |
449 | if (ACPI_FAILURE(status)) | |
450 | goto not_found; | |
451 | ||
452 | result = intel_menlow_add_one_attribute("aux1", 0644, | |
453 | aux1_show, aux1_store, | |
454 | &thermal->device, handle); | |
455 | if (result) | |
456 | return AE_ERROR; | |
457 | ||
458 | /* | |
459 | * create the "dabney_enabled" attribute which means the user app | |
460 | * should be loaded or not | |
461 | */ | |
462 | ||
463 | result = intel_menlow_add_one_attribute("bios_enabled", 0444, | |
464 | bios_enabled_show, NULL, | |
465 | &thermal->device, handle); | |
466 | if (result) | |
467 | return AE_ERROR; | |
468 | ||
469 | not_found: | |
470 | if (status == AE_NOT_FOUND) | |
471 | return AE_OK; | |
472 | else | |
473 | return status; | |
474 | } | |
475 | ||
476 | static void intel_menlow_unregister_sensor(void) | |
477 | { | |
478 | struct intel_menlow_attribute *pos, *next; | |
479 | ||
480 | mutex_lock(&intel_menlow_attr_lock); | |
481 | list_for_each_entry_safe(pos, next, &intel_menlow_attr_list, node) { | |
482 | list_del(&pos->node); | |
483 | device_remove_file(pos->device, &pos->attr); | |
484 | kfree(pos); | |
485 | } | |
486 | mutex_unlock(&intel_menlow_attr_lock); | |
487 | ||
488 | return; | |
489 | } | |
490 | ||
491 | static int __init intel_menlow_module_init(void) | |
492 | { | |
493 | int result = -ENODEV; | |
494 | acpi_status status; | |
27663c58 | 495 | unsigned long long enable; |
cc0573b3 TS |
496 | |
497 | if (acpi_disabled) | |
498 | return result; | |
499 | ||
500 | /* Looking for the \_TZ.GSTS method */ | |
501 | status = acpi_evaluate_integer(NULL, BIOS_ENABLED, NULL, &enable); | |
502 | if (ACPI_FAILURE(status) || !enable) | |
503 | return -ENODEV; | |
504 | ||
505 | /* Looking for ACPI device MEM0 with hardware id INT0002 */ | |
506 | result = acpi_bus_register_driver(&intel_menlow_memory_driver); | |
507 | if (result) | |
508 | return result; | |
509 | ||
510 | /* Looking for sensors in each ACPI thermal zone */ | |
511 | status = acpi_walk_namespace(ACPI_TYPE_THERMAL, ACPI_ROOT_OBJECT, | |
512 | ACPI_UINT32_MAX, | |
513 | intel_menlow_register_sensor, NULL, NULL); | |
514 | if (ACPI_FAILURE(status)) | |
515 | return -ENODEV; | |
516 | ||
517 | return 0; | |
518 | } | |
519 | ||
520 | static void __exit intel_menlow_module_exit(void) | |
521 | { | |
522 | acpi_bus_unregister_driver(&intel_menlow_memory_driver); | |
523 | intel_menlow_unregister_sensor(); | |
524 | } | |
525 | ||
526 | module_init(intel_menlow_module_init); | |
527 | module_exit(intel_menlow_module_exit); |