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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> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
cc0573b3 TS |
34 | #include <linux/types.h> |
35 | #include <linux/pci.h> | |
36 | #include <linux/pm.h> | |
37 | ||
38 | #include <linux/thermal.h> | |
39 | #include <acpi/acpi_bus.h> | |
40 | #include <acpi/acpi_drivers.h> | |
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 | ||
d65dcdcf TS |
56 | /* |
57 | * GTHS returning 'n' would mean that [0,n-1] states are supported | |
58 | * In that case max_cstate would be n-1 | |
59 | * GTHS returning '0' would mean that no bandwidth control states are supported | |
60 | */ | |
6503e5df MG |
61 | static int memory_get_max_bandwidth(struct thermal_cooling_device *cdev, |
62 | unsigned long *max_state) | |
cc0573b3 TS |
63 | { |
64 | struct acpi_device *device = cdev->devdata; | |
65 | acpi_handle handle = device->handle; | |
27663c58 | 66 | unsigned long long value; |
cc0573b3 TS |
67 | struct acpi_object_list arg_list; |
68 | union acpi_object arg; | |
69 | acpi_status status = AE_OK; | |
70 | ||
71 | arg_list.count = 1; | |
72 | arg_list.pointer = &arg; | |
73 | arg.type = ACPI_TYPE_INTEGER; | |
74 | arg.integer.value = MEMORY_ARG_MAX_BANDWIDTH; | |
75 | status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH, | |
76 | &arg_list, &value); | |
77 | if (ACPI_FAILURE(status)) | |
78 | return -EFAULT; | |
79 | ||
c2d06fe3 ZR |
80 | if (!value) |
81 | return -EINVAL; | |
82 | ||
cc0573b3 TS |
83 | *max_state = value - 1; |
84 | return 0; | |
85 | } | |
86 | ||
cc0573b3 | 87 | static int memory_get_cur_bandwidth(struct thermal_cooling_device *cdev, |
6503e5df | 88 | unsigned long *value) |
cc0573b3 TS |
89 | { |
90 | struct acpi_device *device = cdev->devdata; | |
91 | acpi_handle handle = device->handle; | |
6503e5df | 92 | unsigned long long result; |
cc0573b3 TS |
93 | struct acpi_object_list arg_list; |
94 | union acpi_object arg; | |
95 | acpi_status status = AE_OK; | |
96 | ||
97 | arg_list.count = 1; | |
98 | arg_list.pointer = &arg; | |
99 | arg.type = ACPI_TYPE_INTEGER; | |
100 | arg.integer.value = MEMORY_ARG_CUR_BANDWIDTH; | |
101 | status = acpi_evaluate_integer(handle, MEMORY_GET_BANDWIDTH, | |
6503e5df | 102 | &arg_list, &result); |
cc0573b3 TS |
103 | if (ACPI_FAILURE(status)) |
104 | return -EFAULT; | |
105 | ||
6503e5df MG |
106 | *value = result; |
107 | return 0; | |
cc0573b3 TS |
108 | } |
109 | ||
110 | static int memory_set_cur_bandwidth(struct thermal_cooling_device *cdev, | |
6503e5df | 111 | unsigned long state) |
cc0573b3 TS |
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; | |
27663c58 | 118 | unsigned long long temp; |
cc0573b3 TS |
119 | unsigned long max_state; |
120 | ||
6503e5df | 121 | if (memory_get_max_bandwidth(cdev, &max_state)) |
cc0573b3 TS |
122 | return -EFAULT; |
123 | ||
c2d06fe3 | 124 | if (state > max_state) |
cc0573b3 TS |
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, | |
27663c58 | 134 | &temp); |
cc0573b3 TS |
135 | |
136 | printk(KERN_INFO | |
6503e5df | 137 | "Bandwidth value was %ld: status is %d\n", state, status); |
cc0573b3 TS |
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); | |
69f6b8dd TS |
173 | if (IS_ERR(cdev)) { |
174 | result = PTR_ERR(cdev); | |
175 | goto end; | |
176 | } | |
177 | ||
db89b4f0 | 178 | device->driver_data = cdev; |
3a8ca95e JL |
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; | |
cc0573b3 TS |
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 | ||
f7e8dd50 | 214 | static const struct acpi_device_id intel_menlow_memory_ids[] = { |
cc0573b3 TS |
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 | */ | |
27663c58 MW |
255 | static int sensor_get_auxtrip(acpi_handle handle, int index, |
256 | unsigned long long *value) | |
cc0573b3 TS |
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, | |
27663c58 | 264 | NULL, value); |
cc0573b3 TS |
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 | }; | |
27663c58 | 286 | unsigned long long temp; |
cc0573b3 TS |
287 | |
288 | if (index != 0 && index != 1) | |
289 | return -EINVAL; | |
290 | ||
291 | status = acpi_evaluate_integer(handle, index ? GET_AUX0 : GET_AUX1, | |
27663c58 | 292 | NULL, &temp); |
cc0573b3 TS |
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, | |
27663c58 | 300 | &args, &temp); |
cc0573b3 TS |
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); | |
27663c58 | 316 | unsigned long long value; |
cc0573b3 TS |
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); | |
27663c58 | 328 | unsigned long long value; |
cc0573b3 TS |
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; | |
27663c58 | 380 | unsigned long long bios_enabled; |
cc0573b3 TS |
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; | |
27663c58 | 496 | unsigned long long enable; |
cc0573b3 TS |
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, | |
2263576c | 514 | intel_menlow_register_sensor, NULL, NULL, NULL); |
cc0573b3 TS |
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); |