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ALSA: hda - Add support for 92HD65 / 92HD66 family of codecs
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / asus_atk0110.c
blob00e98517f94c6d5bbb26e384cb08bb687b00cc16
1 /*
2 * Copyright (C) 2007-2009 Luca Tettamanti <kronos.it@gmail.com>
3 *
4 * This file is released under the GPLv2
5 * See COPYING in the top level directory of the kernel tree.
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/debugfs.h>
11 #include <linux/kernel.h>
12 #include <linux/hwmon.h>
13 #include <linux/list.h>
14 #include <linux/module.h>
15 #include <linux/slab.h>
16 #include <linux/dmi.h>
17
18 #include <acpi/acpi.h>
19 #include <acpi/acpixf.h>
20 #include <acpi/acpi_drivers.h>
21 #include <acpi/acpi_bus.h>
22
23
24 #define ATK_HID "ATK0110"
25
26 static bool new_if;
27 module_param(new_if, bool, 0);
28 MODULE_PARM_DESC(new_if, "Override detection heuristic and force the use of the new ATK0110 interface");
29
30 static const struct dmi_system_id __initconst atk_force_new_if[] = {
31 {
32 /* Old interface has broken MCH temp monitoring */
33 .ident = "Asus Sabertooth X58",
34 .matches = {
35 DMI_MATCH(DMI_BOARD_NAME, "SABERTOOTH X58")
36 }
37 },
38 { }
39 };
40
41 /* Minimum time between readings, enforced in order to avoid
42 * hogging the CPU.
43 */
44 #define CACHE_TIME HZ
45
46 #define BOARD_ID "MBIF"
47 #define METHOD_ENUMERATE "GGRP"
48 #define METHOD_READ "GITM"
49 #define METHOD_WRITE "SITM"
50 #define METHOD_OLD_READ_TMP "RTMP"
51 #define METHOD_OLD_READ_VLT "RVLT"
52 #define METHOD_OLD_READ_FAN "RFAN"
53 #define METHOD_OLD_ENUM_TMP "TSIF"
54 #define METHOD_OLD_ENUM_VLT "VSIF"
55 #define METHOD_OLD_ENUM_FAN "FSIF"
56
57 #define ATK_MUX_HWMON 0x00000006ULL
58 #define ATK_MUX_MGMT 0x00000011ULL
59
60 #define ATK_CLASS_MASK 0xff000000ULL
61 #define ATK_CLASS_FREQ_CTL 0x03000000ULL
62 #define ATK_CLASS_FAN_CTL 0x04000000ULL
63 #define ATK_CLASS_HWMON 0x06000000ULL
64 #define ATK_CLASS_MGMT 0x11000000ULL
65
66 #define ATK_TYPE_MASK 0x00ff0000ULL
67 #define HWMON_TYPE_VOLT 0x00020000ULL
68 #define HWMON_TYPE_TEMP 0x00030000ULL
69 #define HWMON_TYPE_FAN 0x00040000ULL
70
71 #define ATK_ELEMENT_ID_MASK 0x0000ffffULL
72
73 #define ATK_EC_ID 0x11060004ULL
74
75 enum atk_pack_member {
76 HWMON_PACK_FLAGS,
77 HWMON_PACK_NAME,
78 HWMON_PACK_LIMIT1,
79 HWMON_PACK_LIMIT2,
80 HWMON_PACK_ENABLE
81 };
82
83 /* New package format */
84 #define _HWMON_NEW_PACK_SIZE 7
85 #define _HWMON_NEW_PACK_FLAGS 0
86 #define _HWMON_NEW_PACK_NAME 1
87 #define _HWMON_NEW_PACK_UNK1 2
88 #define _HWMON_NEW_PACK_UNK2 3
89 #define _HWMON_NEW_PACK_LIMIT1 4
90 #define _HWMON_NEW_PACK_LIMIT2 5
91 #define _HWMON_NEW_PACK_ENABLE 6
92
93 /* Old package format */
94 #define _HWMON_OLD_PACK_SIZE 5
95 #define _HWMON_OLD_PACK_FLAGS 0
96 #define _HWMON_OLD_PACK_NAME 1
97 #define _HWMON_OLD_PACK_LIMIT1 2
98 #define _HWMON_OLD_PACK_LIMIT2 3
99 #define _HWMON_OLD_PACK_ENABLE 4
100
101
102 struct atk_data {
103 struct device *hwmon_dev;
104 acpi_handle atk_handle;
105 struct acpi_device *acpi_dev;
106
107 bool old_interface;
108
109 /* old interface */
110 acpi_handle rtmp_handle;
111 acpi_handle rvlt_handle;
112 acpi_handle rfan_handle;
113 /* new inteface */
114 acpi_handle enumerate_handle;
115 acpi_handle read_handle;
116 acpi_handle write_handle;
117
118 bool disable_ec;
119
120 int voltage_count;
121 int temperature_count;
122 int fan_count;
123 struct list_head sensor_list;
124
125 struct {
126 struct dentry *root;
127 u32 id;
128 } debugfs;
129 };
130
131
132 typedef ssize_t (*sysfs_show_func)(struct device *dev,
133 struct device_attribute *attr, char *buf);
134
135 static const struct acpi_device_id atk_ids[] = {
136 {ATK_HID, 0},
137 {"", 0},
138 };
139 MODULE_DEVICE_TABLE(acpi, atk_ids);
140
141 #define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */
142
143 struct atk_sensor_data {
144 struct list_head list;
145 struct atk_data *data;
146 struct device_attribute label_attr;
147 struct device_attribute input_attr;
148 struct device_attribute limit1_attr;
149 struct device_attribute limit2_attr;
150 char label_attr_name[ATTR_NAME_SIZE];
151 char input_attr_name[ATTR_NAME_SIZE];
152 char limit1_attr_name[ATTR_NAME_SIZE];
153 char limit2_attr_name[ATTR_NAME_SIZE];
154 u64 id;
155 u64 type;
156 u64 limit1;
157 u64 limit2;
158 u64 cached_value;
159 unsigned long last_updated; /* in jiffies */
160 bool is_valid;
161 char const *acpi_name;
162 };
163
164 /* Return buffer format:
165 * [0-3] "value" is valid flag
166 * [4-7] value
167 * [8- ] unknown stuff on newer mobos
168 */
169 struct atk_acpi_ret_buffer {
170 u32 flags;
171 u32 value;
172 u8 data[];
173 };
174
175 /* Input buffer used for GITM and SITM methods */
176 struct atk_acpi_input_buf {
177 u32 id;
178 u32 param1;
179 u32 param2;
180 };
181
182 static int atk_add(struct acpi_device *device);
183 static int atk_remove(struct acpi_device *device, int type);
184 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
185 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
186 static void atk_free_sensors(struct atk_data *data);
187
188 static struct acpi_driver atk_driver = {
189 .name = ATK_HID,
190 .class = "hwmon",
191 .ids = atk_ids,
192 .ops = {
193 .add = atk_add,
194 .remove = atk_remove,
195 },
196 };
197
198 #define input_to_atk_sensor(attr) \
199 container_of(attr, struct atk_sensor_data, input_attr)
200
201 #define label_to_atk_sensor(attr) \
202 container_of(attr, struct atk_sensor_data, label_attr)
203
204 #define limit1_to_atk_sensor(attr) \
205 container_of(attr, struct atk_sensor_data, limit1_attr)
206
207 #define limit2_to_atk_sensor(attr) \
208 container_of(attr, struct atk_sensor_data, limit2_attr)
209
210 static ssize_t atk_input_show(struct device *dev,
211 struct device_attribute *attr, char *buf)
212 {
213 struct atk_sensor_data *s = input_to_atk_sensor(attr);
214 u64 value;
215 int err;
216
217 err = atk_read_value(s, &value);
218 if (err)
219 return err;
220
221 if (s->type == HWMON_TYPE_TEMP)
222 /* ACPI returns decidegree */
223 value *= 100;
224
225 return sprintf(buf, "%llu\n", value);
226 }
227
228 static ssize_t atk_label_show(struct device *dev,
229 struct device_attribute *attr, char *buf)
230 {
231 struct atk_sensor_data *s = label_to_atk_sensor(attr);
232
233 return sprintf(buf, "%s\n", s->acpi_name);
234 }
235
236 static ssize_t atk_limit1_show(struct device *dev,
237 struct device_attribute *attr, char *buf)
238 {
239 struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
240 u64 value = s->limit1;
241
242 if (s->type == HWMON_TYPE_TEMP)
243 value *= 100;
244
245 return sprintf(buf, "%lld\n", value);
246 }
247
248 static ssize_t atk_limit2_show(struct device *dev,
249 struct device_attribute *attr, char *buf)
250 {
251 struct atk_sensor_data *s = limit2_to_atk_sensor(attr);
252 u64 value = s->limit2;
253
254 if (s->type == HWMON_TYPE_TEMP)
255 value *= 100;
256
257 return sprintf(buf, "%lld\n", value);
258 }
259
260 static ssize_t atk_name_show(struct device *dev,
261 struct device_attribute *attr, char *buf)
262 {
263 return sprintf(buf, "atk0110\n");
264 }
265 static struct device_attribute atk_name_attr =
266 __ATTR(name, 0444, atk_name_show, NULL);
267
268 static void atk_init_attribute(struct device_attribute *attr, char *name,
269 sysfs_show_func show)
270 {
271 sysfs_attr_init(&attr->attr);
272 attr->attr.name = name;
273 attr->attr.mode = 0444;
274 attr->show = show;
275 attr->store = NULL;
276 }
277
278
279 static union acpi_object *atk_get_pack_member(struct atk_data *data,
280 union acpi_object *pack,
281 enum atk_pack_member m)
282 {
283 bool old_if = data->old_interface;
284 int offset;
285
286 switch (m) {
287 case HWMON_PACK_FLAGS:
288 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS;
289 break;
290 case HWMON_PACK_NAME:
291 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME;
292 break;
293 case HWMON_PACK_LIMIT1:
294 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 :
295 _HWMON_NEW_PACK_LIMIT1;
296 break;
297 case HWMON_PACK_LIMIT2:
298 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 :
299 _HWMON_NEW_PACK_LIMIT2;
300 break;
301 case HWMON_PACK_ENABLE:
302 offset = old_if ? _HWMON_OLD_PACK_ENABLE :
303 _HWMON_NEW_PACK_ENABLE;
304 break;
305 default:
306 return NULL;
307 }
308
309 return &pack->package.elements[offset];
310 }
311
312
313 /* New package format is:
314 * - flag (int)
315 * class - used for de-muxing the request to the correct GITn
316 * type (volt, temp, fan)
317 * sensor id |
318 * sensor id - used for de-muxing the request _inside_ the GITn
319 * - name (str)
320 * - unknown (int)
321 * - unknown (int)
322 * - limit1 (int)
323 * - limit2 (int)
324 * - enable (int)
325 *
326 * The old package has the same format but it's missing the two unknown fields.
327 */
328 static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj)
329 {
330 struct device *dev = &data->acpi_dev->dev;
331 union acpi_object *tmp;
332 bool old_if = data->old_interface;
333 int const expected_size = old_if ? _HWMON_OLD_PACK_SIZE :
334 _HWMON_NEW_PACK_SIZE;
335
336 if (obj->type != ACPI_TYPE_PACKAGE) {
337 dev_warn(dev, "Invalid type: %d\n", obj->type);
338 return -EINVAL;
339 }
340
341 if (obj->package.count != expected_size) {
342 dev_warn(dev, "Invalid package size: %d, expected: %d\n",
343 obj->package.count, expected_size);
344 return -EINVAL;
345 }
346
347 tmp = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
348 if (tmp->type != ACPI_TYPE_INTEGER) {
349 dev_warn(dev, "Invalid type (flag): %d\n", tmp->type);
350 return -EINVAL;
351 }
352
353 tmp = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
354 if (tmp->type != ACPI_TYPE_STRING) {
355 dev_warn(dev, "Invalid type (name): %d\n", tmp->type);
356 return -EINVAL;
357 }
358
359 /* Don't check... we don't know what they're useful for anyway */
360 #if 0
361 tmp = &obj->package.elements[HWMON_PACK_UNK1];
362 if (tmp->type != ACPI_TYPE_INTEGER) {
363 dev_warn(dev, "Invalid type (unk1): %d\n", tmp->type);
364 return -EINVAL;
365 }
366
367 tmp = &obj->package.elements[HWMON_PACK_UNK2];
368 if (tmp->type != ACPI_TYPE_INTEGER) {
369 dev_warn(dev, "Invalid type (unk2): %d\n", tmp->type);
370 return -EINVAL;
371 }
372 #endif
373
374 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
375 if (tmp->type != ACPI_TYPE_INTEGER) {
376 dev_warn(dev, "Invalid type (limit1): %d\n", tmp->type);
377 return -EINVAL;
378 }
379
380 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
381 if (tmp->type != ACPI_TYPE_INTEGER) {
382 dev_warn(dev, "Invalid type (limit2): %d\n", tmp->type);
383 return -EINVAL;
384 }
385
386 tmp = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
387 if (tmp->type != ACPI_TYPE_INTEGER) {
388 dev_warn(dev, "Invalid type (enable): %d\n", tmp->type);
389 return -EINVAL;
390 }
391
392 atk_print_sensor(data, obj);
393
394 return 0;
395 }
396
397 #ifdef DEBUG
398 static char const *atk_sensor_type(union acpi_object *flags)
399 {
400 u64 type = flags->integer.value & ATK_TYPE_MASK;
401 char const *what;
402
403 switch (type) {
404 case HWMON_TYPE_VOLT:
405 what = "voltage";
406 break;
407 case HWMON_TYPE_TEMP:
408 what = "temperature";
409 break;
410 case HWMON_TYPE_FAN:
411 what = "fan";
412 break;
413 default:
414 what = "unknown";
415 break;
416 }
417
418 return what;
419 }
420 #endif
421
422 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
423 {
424 #ifdef DEBUG
425 struct device *dev = &data->acpi_dev->dev;
426 union acpi_object *flags;
427 union acpi_object *name;
428 union acpi_object *limit1;
429 union acpi_object *limit2;
430 union acpi_object *enable;
431 char const *what;
432
433 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
434 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
435 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
436 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
437 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
438
439 what = atk_sensor_type(flags);
440
441 dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what,
442 flags->integer.value,
443 name->string.pointer,
444 limit1->integer.value, limit2->integer.value,
445 enable->integer.value ? "enabled" : "disabled");
446 #endif
447 }
448
449 static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
450 {
451 struct atk_data *data = sensor->data;
452 struct device *dev = &data->acpi_dev->dev;
453 struct acpi_object_list params;
454 union acpi_object id;
455 acpi_status status;
456 acpi_handle method;
457
458 switch (sensor->type) {
459 case HWMON_TYPE_VOLT:
460 method = data->rvlt_handle;
461 break;
462 case HWMON_TYPE_TEMP:
463 method = data->rtmp_handle;
464 break;
465 case HWMON_TYPE_FAN:
466 method = data->rfan_handle;
467 break;
468 default:
469 return -EINVAL;
470 }
471
472 id.type = ACPI_TYPE_INTEGER;
473 id.integer.value = sensor->id;
474
475 params.count = 1;
476 params.pointer = &id;
477
478 status = acpi_evaluate_integer(method, NULL, &params, value);
479 if (status != AE_OK) {
480 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
481 acpi_format_exception(status));
482 return -EIO;
483 }
484
485 return 0;
486 }
487
488 static union acpi_object *atk_ggrp(struct atk_data *data, u16 mux)
489 {
490 struct device *dev = &data->acpi_dev->dev;
491 struct acpi_buffer buf;
492 acpi_status ret;
493 struct acpi_object_list params;
494 union acpi_object id;
495 union acpi_object *pack;
496
497 id.type = ACPI_TYPE_INTEGER;
498 id.integer.value = mux;
499 params.count = 1;
500 params.pointer = &id;
501
502 buf.length = ACPI_ALLOCATE_BUFFER;
503 ret = acpi_evaluate_object(data->enumerate_handle, NULL, &params, &buf);
504 if (ret != AE_OK) {
505 dev_err(dev, "GGRP[%#x] ACPI exception: %s\n", mux,
506 acpi_format_exception(ret));
507 return ERR_PTR(-EIO);
508 }
509 pack = buf.pointer;
510 if (pack->type != ACPI_TYPE_PACKAGE) {
511 /* Execution was successful, but the id was not found */
512 ACPI_FREE(pack);
513 return ERR_PTR(-ENOENT);
514 }
515
516 if (pack->package.count < 1) {
517 dev_err(dev, "GGRP[%#x] package is too small\n", mux);
518 ACPI_FREE(pack);
519 return ERR_PTR(-EIO);
520 }
521 return pack;
522 }
523
524 static union acpi_object *atk_gitm(struct atk_data *data, u64 id)
525 {
526 struct device *dev = &data->acpi_dev->dev;
527 struct atk_acpi_input_buf buf;
528 union acpi_object tmp;
529 struct acpi_object_list params;
530 struct acpi_buffer ret;
531 union acpi_object *obj;
532 acpi_status status;
533
534 buf.id = id;
535 buf.param1 = 0;
536 buf.param2 = 0;
537
538 tmp.type = ACPI_TYPE_BUFFER;
539 tmp.buffer.pointer = (u8 *)&buf;
540 tmp.buffer.length = sizeof(buf);
541
542 params.count = 1;
543 params.pointer = (void *)&tmp;
544
545 ret.length = ACPI_ALLOCATE_BUFFER;
546 status = acpi_evaluate_object_typed(data->read_handle, NULL, &params,
547 &ret, ACPI_TYPE_BUFFER);
548 if (status != AE_OK) {
549 dev_warn(dev, "GITM[%#llx] ACPI exception: %s\n", id,
550 acpi_format_exception(status));
551 return ERR_PTR(-EIO);
552 }
553 obj = ret.pointer;
554
555 /* Sanity check */
556 if (obj->buffer.length < 8) {
557 dev_warn(dev, "Unexpected ASBF length: %u\n",
558 obj->buffer.length);
559 ACPI_FREE(obj);
560 return ERR_PTR(-EIO);
561 }
562 return obj;
563 }
564
565 static union acpi_object *atk_sitm(struct atk_data *data,
566 struct atk_acpi_input_buf *buf)
567 {
568 struct device *dev = &data->acpi_dev->dev;
569 struct acpi_object_list params;
570 union acpi_object tmp;
571 struct acpi_buffer ret;
572 union acpi_object *obj;
573 acpi_status status;
574
575 tmp.type = ACPI_TYPE_BUFFER;
576 tmp.buffer.pointer = (u8 *)buf;
577 tmp.buffer.length = sizeof(*buf);
578
579 params.count = 1;
580 params.pointer = &tmp;
581
582 ret.length = ACPI_ALLOCATE_BUFFER;
583 status = acpi_evaluate_object_typed(data->write_handle, NULL, &params,
584 &ret, ACPI_TYPE_BUFFER);
585 if (status != AE_OK) {
586 dev_warn(dev, "SITM[%#x] ACPI exception: %s\n", buf->id,
587 acpi_format_exception(status));
588 return ERR_PTR(-EIO);
589 }
590 obj = ret.pointer;
591
592 /* Sanity check */
593 if (obj->buffer.length < 8) {
594 dev_warn(dev, "Unexpected ASBF length: %u\n",
595 obj->buffer.length);
596 ACPI_FREE(obj);
597 return ERR_PTR(-EIO);
598 }
599 return obj;
600 }
601
602 static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
603 {
604 struct atk_data *data = sensor->data;
605 struct device *dev = &data->acpi_dev->dev;
606 union acpi_object *obj;
607 struct atk_acpi_ret_buffer *buf;
608 int err = 0;
609
610 obj = atk_gitm(data, sensor->id);
611 if (IS_ERR(obj))
612 return PTR_ERR(obj);
613
614 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
615 if (buf->flags == 0) {
616 /* The reading is not valid, possible causes:
617 * - sensor failure
618 * - enumeration was FUBAR (and we didn't notice)
619 */
620 dev_warn(dev, "Read failed, sensor = %#llx\n", sensor->id);
621 err = -EIO;
622 goto out;
623 }
624
625 *value = buf->value;
626 out:
627 ACPI_FREE(obj);
628 return err;
629 }
630
631 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
632 {
633 int err;
634
635 if (!sensor->is_valid ||
636 time_after(jiffies, sensor->last_updated + CACHE_TIME)) {
637 if (sensor->data->old_interface)
638 err = atk_read_value_old(sensor, value);
639 else
640 err = atk_read_value_new(sensor, value);
641
642 sensor->is_valid = true;
643 sensor->last_updated = jiffies;
644 sensor->cached_value = *value;
645 } else {
646 *value = sensor->cached_value;
647 err = 0;
648 }
649
650 return err;
651 }
652
653 #ifdef CONFIG_DEBUG_FS
654 static int atk_debugfs_gitm_get(void *p, u64 *val)
655 {
656 struct atk_data *data = p;
657 union acpi_object *ret;
658 struct atk_acpi_ret_buffer *buf;
659 int err = 0;
660
661 if (!data->read_handle)
662 return -ENODEV;
663
664 if (!data->debugfs.id)
665 return -EINVAL;
666
667 ret = atk_gitm(data, data->debugfs.id);
668 if (IS_ERR(ret))
669 return PTR_ERR(ret);
670
671 buf = (struct atk_acpi_ret_buffer *)ret->buffer.pointer;
672 if (buf->flags)
673 *val = buf->value;
674 else
675 err = -EIO;
676
677 ACPI_FREE(ret);
678 return err;
679 }
680
681 DEFINE_SIMPLE_ATTRIBUTE(atk_debugfs_gitm,
682 atk_debugfs_gitm_get,
683 NULL,
684 "0x%08llx\n")
685
686 static int atk_acpi_print(char *buf, size_t sz, union acpi_object *obj)
687 {
688 int ret = 0;
689
690 switch (obj->type) {
691 case ACPI_TYPE_INTEGER:
692 ret = snprintf(buf, sz, "0x%08llx\n", obj->integer.value);
693 break;
694 case ACPI_TYPE_STRING:
695 ret = snprintf(buf, sz, "%s\n", obj->string.pointer);
696 break;
697 }
698
699 return ret;
700 }
701
702 static void atk_pack_print(char *buf, size_t sz, union acpi_object *pack)
703 {
704 int ret;
705 int i;
706
707 for (i = 0; i < pack->package.count; i++) {
708 union acpi_object *obj = &pack->package.elements[i];
709
710 ret = atk_acpi_print(buf, sz, obj);
711 if (ret >= sz)
712 break;
713 buf += ret;
714 sz -= ret;
715 }
716 }
717
718 static int atk_debugfs_ggrp_open(struct inode *inode, struct file *file)
719 {
720 struct atk_data *data = inode->i_private;
721 char *buf = NULL;
722 union acpi_object *ret;
723 u8 cls;
724 int i;
725
726 if (!data->enumerate_handle)
727 return -ENODEV;
728 if (!data->debugfs.id)
729 return -EINVAL;
730
731 cls = (data->debugfs.id & 0xff000000) >> 24;
732 ret = atk_ggrp(data, cls);
733 if (IS_ERR(ret))
734 return PTR_ERR(ret);
735
736 for (i = 0; i < ret->package.count; i++) {
737 union acpi_object *pack = &ret->package.elements[i];
738 union acpi_object *id;
739
740 if (pack->type != ACPI_TYPE_PACKAGE)
741 continue;
742 if (!pack->package.count)
743 continue;
744 id = &pack->package.elements[0];
745 if (id->integer.value == data->debugfs.id) {
746 /* Print the package */
747 buf = kzalloc(512, GFP_KERNEL);
748 if (!buf) {
749 ACPI_FREE(ret);
750 return -ENOMEM;
751 }
752 atk_pack_print(buf, 512, pack);
753 break;
754 }
755 }
756 ACPI_FREE(ret);
757
758 if (!buf)
759 return -EINVAL;
760
761 file->private_data = buf;
762
763 return nonseekable_open(inode, file);
764 }
765
766 static ssize_t atk_debugfs_ggrp_read(struct file *file, char __user *buf,
767 size_t count, loff_t *pos)
768 {
769 char *str = file->private_data;
770 size_t len = strlen(str);
771
772 return simple_read_from_buffer(buf, count, pos, str, len);
773 }
774
775 static int atk_debugfs_ggrp_release(struct inode *inode, struct file *file)
776 {
777 kfree(file->private_data);
778 return 0;
779 }
780
781 static const struct file_operations atk_debugfs_ggrp_fops = {
782 .read = atk_debugfs_ggrp_read,
783 .open = atk_debugfs_ggrp_open,
784 .release = atk_debugfs_ggrp_release,
785 .llseek = no_llseek,
786 };
787
788 static void atk_debugfs_init(struct atk_data *data)
789 {
790 struct dentry *d;
791 struct dentry *f;
792
793 data->debugfs.id = 0;
794
795 d = debugfs_create_dir("asus_atk0110", NULL);
796 if (!d || IS_ERR(d))
797 return;
798
799 f = debugfs_create_x32("id", S_IRUSR | S_IWUSR, d, &data->debugfs.id);
800 if (!f || IS_ERR(f))
801 goto cleanup;
802
803 f = debugfs_create_file("gitm", S_IRUSR, d, data,
804 &atk_debugfs_gitm);
805 if (!f || IS_ERR(f))
806 goto cleanup;
807
808 f = debugfs_create_file("ggrp", S_IRUSR, d, data,
809 &atk_debugfs_ggrp_fops);
810 if (!f || IS_ERR(f))
811 goto cleanup;
812
813 data->debugfs.root = d;
814
815 return;
816 cleanup:
817 debugfs_remove_recursive(d);
818 }
819
820 static void atk_debugfs_cleanup(struct atk_data *data)
821 {
822 debugfs_remove_recursive(data->debugfs.root);
823 }
824
825 #else /* CONFIG_DEBUG_FS */
826
827 static void atk_debugfs_init(struct atk_data *data)
828 {
829 }
830
831 static void atk_debugfs_cleanup(struct atk_data *data)
832 {
833 }
834 #endif
835
836 static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
837 {
838 struct device *dev = &data->acpi_dev->dev;
839 union acpi_object *flags;
840 union acpi_object *name;
841 union acpi_object *limit1;
842 union acpi_object *limit2;
843 union acpi_object *enable;
844 struct atk_sensor_data *sensor;
845 char const *base_name;
846 char const *limit1_name;
847 char const *limit2_name;
848 u64 type;
849 int err;
850 int *num;
851 int start;
852
853 if (obj->type != ACPI_TYPE_PACKAGE) {
854 /* wft is this? */
855 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
856 obj->type);
857 return -EINVAL;
858 }
859
860 err = validate_hwmon_pack(data, obj);
861 if (err)
862 return err;
863
864 /* Ok, we have a valid hwmon package */
865 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
866 & ATK_TYPE_MASK;
867
868 switch (type) {
869 case HWMON_TYPE_VOLT:
870 base_name = "in";
871 limit1_name = "min";
872 limit2_name = "max";
873 num = &data->voltage_count;
874 start = 0;
875 break;
876 case HWMON_TYPE_TEMP:
877 base_name = "temp";
878 limit1_name = "max";
879 limit2_name = "crit";
880 num = &data->temperature_count;
881 start = 1;
882 break;
883 case HWMON_TYPE_FAN:
884 base_name = "fan";
885 limit1_name = "min";
886 limit2_name = "max";
887 num = &data->fan_count;
888 start = 1;
889 break;
890 default:
891 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
892 return -EINVAL;
893 }
894
895 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
896 if (!enable->integer.value)
897 /* sensor is disabled */
898 return 0;
899
900 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
901 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
902 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
903 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
904
905 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
906 if (!sensor)
907 return -ENOMEM;
908
909 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
910 if (!sensor->acpi_name) {
911 err = -ENOMEM;
912 goto out;
913 }
914
915 INIT_LIST_HEAD(&sensor->list);
916 sensor->type = type;
917 sensor->data = data;
918 sensor->id = flags->integer.value;
919 sensor->limit1 = limit1->integer.value;
920 if (data->old_interface)
921 sensor->limit2 = limit2->integer.value;
922 else
923 /* The upper limit is expressed as delta from lower limit */
924 sensor->limit2 = sensor->limit1 + limit2->integer.value;
925
926 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
927 "%s%d_input", base_name, start + *num);
928 atk_init_attribute(&sensor->input_attr,
929 sensor->input_attr_name,
930 atk_input_show);
931
932 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
933 "%s%d_label", base_name, start + *num);
934 atk_init_attribute(&sensor->label_attr,
935 sensor->label_attr_name,
936 atk_label_show);
937
938 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
939 "%s%d_%s", base_name, start + *num, limit1_name);
940 atk_init_attribute(&sensor->limit1_attr,
941 sensor->limit1_attr_name,
942 atk_limit1_show);
943
944 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
945 "%s%d_%s", base_name, start + *num, limit2_name);
946 atk_init_attribute(&sensor->limit2_attr,
947 sensor->limit2_attr_name,
948 atk_limit2_show);
949
950 list_add(&sensor->list, &data->sensor_list);
951 (*num)++;
952
953 return 1;
954 out:
955 kfree(sensor->acpi_name);
956 kfree(sensor);
957 return err;
958 }
959
960 static int atk_enumerate_old_hwmon(struct atk_data *data)
961 {
962 struct device *dev = &data->acpi_dev->dev;
963 struct acpi_buffer buf;
964 union acpi_object *pack;
965 acpi_status status;
966 int i, ret;
967 int count = 0;
968
969 /* Voltages */
970 buf.length = ACPI_ALLOCATE_BUFFER;
971 status = acpi_evaluate_object_typed(data->atk_handle,
972 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
973 if (status != AE_OK) {
974 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
975 acpi_format_exception(status));
976
977 return -ENODEV;
978 }
979
980 pack = buf.pointer;
981 for (i = 1; i < pack->package.count; i++) {
982 union acpi_object *obj = &pack->package.elements[i];
983
984 ret = atk_add_sensor(data, obj);
985 if (ret > 0)
986 count++;
987 }
988 ACPI_FREE(buf.pointer);
989
990 /* Temperatures */
991 buf.length = ACPI_ALLOCATE_BUFFER;
992 status = acpi_evaluate_object_typed(data->atk_handle,
993 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
994 if (status != AE_OK) {
995 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
996 acpi_format_exception(status));
997
998 ret = -ENODEV;
999 goto cleanup;
1000 }
1001
1002 pack = buf.pointer;
1003 for (i = 1; i < pack->package.count; i++) {
1004 union acpi_object *obj = &pack->package.elements[i];
1005
1006 ret = atk_add_sensor(data, obj);
1007 if (ret > 0)
1008 count++;
1009 }
1010 ACPI_FREE(buf.pointer);
1011
1012 /* Fans */
1013 buf.length = ACPI_ALLOCATE_BUFFER;
1014 status = acpi_evaluate_object_typed(data->atk_handle,
1015 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
1016 if (status != AE_OK) {
1017 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
1018 acpi_format_exception(status));
1019
1020 ret = -ENODEV;
1021 goto cleanup;
1022 }
1023
1024 pack = buf.pointer;
1025 for (i = 1; i < pack->package.count; i++) {
1026 union acpi_object *obj = &pack->package.elements[i];
1027
1028 ret = atk_add_sensor(data, obj);
1029 if (ret > 0)
1030 count++;
1031 }
1032 ACPI_FREE(buf.pointer);
1033
1034 return count;
1035 cleanup:
1036 atk_free_sensors(data);
1037 return ret;
1038 }
1039
1040 static int atk_ec_present(struct atk_data *data)
1041 {
1042 struct device *dev = &data->acpi_dev->dev;
1043 union acpi_object *pack;
1044 union acpi_object *ec;
1045 int ret;
1046 int i;
1047
1048 pack = atk_ggrp(data, ATK_MUX_MGMT);
1049 if (IS_ERR(pack)) {
1050 if (PTR_ERR(pack) == -ENOENT) {
1051 /* The MGMT class does not exists - that's ok */
1052 dev_dbg(dev, "Class %#llx not found\n", ATK_MUX_MGMT);
1053 return 0;
1054 }
1055 return PTR_ERR(pack);
1056 }
1057
1058 /* Search the EC */
1059 ec = NULL;
1060 for (i = 0; i < pack->package.count; i++) {
1061 union acpi_object *obj = &pack->package.elements[i];
1062 union acpi_object *id;
1063
1064 if (obj->type != ACPI_TYPE_PACKAGE)
1065 continue;
1066
1067 id = &obj->package.elements[0];
1068 if (id->type != ACPI_TYPE_INTEGER)
1069 continue;
1070
1071 if (id->integer.value == ATK_EC_ID) {
1072 ec = obj;
1073 break;
1074 }
1075 }
1076
1077 ret = (ec != NULL);
1078 if (!ret)
1079 /* The system has no EC */
1080 dev_dbg(dev, "EC not found\n");
1081
1082 ACPI_FREE(pack);
1083 return ret;
1084 }
1085
1086 static int atk_ec_enabled(struct atk_data *data)
1087 {
1088 struct device *dev = &data->acpi_dev->dev;
1089 union acpi_object *obj;
1090 struct atk_acpi_ret_buffer *buf;
1091 int err;
1092
1093 obj = atk_gitm(data, ATK_EC_ID);
1094 if (IS_ERR(obj)) {
1095 dev_err(dev, "Unable to query EC status\n");
1096 return PTR_ERR(obj);
1097 }
1098 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1099
1100 if (buf->flags == 0) {
1101 dev_err(dev, "Unable to query EC status\n");
1102 err = -EIO;
1103 } else {
1104 err = (buf->value != 0);
1105 dev_dbg(dev, "EC is %sabled\n",
1106 err ? "en" : "dis");
1107 }
1108
1109 ACPI_FREE(obj);
1110 return err;
1111 }
1112
1113 static int atk_ec_ctl(struct atk_data *data, int enable)
1114 {
1115 struct device *dev = &data->acpi_dev->dev;
1116 union acpi_object *obj;
1117 struct atk_acpi_input_buf sitm;
1118 struct atk_acpi_ret_buffer *ec_ret;
1119 int err = 0;
1120
1121 sitm.id = ATK_EC_ID;
1122 sitm.param1 = enable;
1123 sitm.param2 = 0;
1124
1125 obj = atk_sitm(data, &sitm);
1126 if (IS_ERR(obj)) {
1127 dev_err(dev, "Failed to %sable the EC\n",
1128 enable ? "en" : "dis");
1129 return PTR_ERR(obj);
1130 }
1131 ec_ret = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1132 if (ec_ret->flags == 0) {
1133 dev_err(dev, "Failed to %sable the EC\n",
1134 enable ? "en" : "dis");
1135 err = -EIO;
1136 } else {
1137 dev_info(dev, "EC %sabled\n",
1138 enable ? "en" : "dis");
1139 }
1140
1141 ACPI_FREE(obj);
1142 return err;
1143 }
1144
1145 static int atk_enumerate_new_hwmon(struct atk_data *data)
1146 {
1147 struct device *dev = &data->acpi_dev->dev;
1148 union acpi_object *pack;
1149 int err;
1150 int i;
1151
1152 err = atk_ec_present(data);
1153 if (err < 0)
1154 return err;
1155 if (err) {
1156 err = atk_ec_enabled(data);
1157 if (err < 0)
1158 return err;
1159 /* If the EC was disabled we will disable it again on unload */
1160 data->disable_ec = err;
1161
1162 err = atk_ec_ctl(data, 1);
1163 if (err) {
1164 data->disable_ec = false;
1165 return err;
1166 }
1167 }
1168
1169 dev_dbg(dev, "Enumerating hwmon sensors\n");
1170
1171 pack = atk_ggrp(data, ATK_MUX_HWMON);
1172 if (IS_ERR(pack))
1173 return PTR_ERR(pack);
1174
1175 for (i = 0; i < pack->package.count; i++) {
1176 union acpi_object *obj = &pack->package.elements[i];
1177
1178 atk_add_sensor(data, obj);
1179 }
1180
1181 err = data->voltage_count + data->temperature_count + data->fan_count;
1182
1183 ACPI_FREE(pack);
1184 return err;
1185 }
1186
1187 static int atk_create_files(struct atk_data *data)
1188 {
1189 struct atk_sensor_data *s;
1190 int err;
1191
1192 list_for_each_entry(s, &data->sensor_list, list) {
1193 err = device_create_file(data->hwmon_dev, &s->input_attr);
1194 if (err)
1195 return err;
1196 err = device_create_file(data->hwmon_dev, &s->label_attr);
1197 if (err)
1198 return err;
1199 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
1200 if (err)
1201 return err;
1202 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
1203 if (err)
1204 return err;
1205 }
1206
1207 err = device_create_file(data->hwmon_dev, &atk_name_attr);
1208
1209 return err;
1210 }
1211
1212 static void atk_remove_files(struct atk_data *data)
1213 {
1214 struct atk_sensor_data *s;
1215
1216 list_for_each_entry(s, &data->sensor_list, list) {
1217 device_remove_file(data->hwmon_dev, &s->input_attr);
1218 device_remove_file(data->hwmon_dev, &s->label_attr);
1219 device_remove_file(data->hwmon_dev, &s->limit1_attr);
1220 device_remove_file(data->hwmon_dev, &s->limit2_attr);
1221 }
1222 device_remove_file(data->hwmon_dev, &atk_name_attr);
1223 }
1224
1225 static void atk_free_sensors(struct atk_data *data)
1226 {
1227 struct list_head *head = &data->sensor_list;
1228 struct atk_sensor_data *s, *tmp;
1229
1230 list_for_each_entry_safe(s, tmp, head, list) {
1231 kfree(s->acpi_name);
1232 kfree(s);
1233 }
1234 }
1235
1236 static int atk_register_hwmon(struct atk_data *data)
1237 {
1238 struct device *dev = &data->acpi_dev->dev;
1239 int err;
1240
1241 dev_dbg(dev, "registering hwmon device\n");
1242 data->hwmon_dev = hwmon_device_register(dev);
1243 if (IS_ERR(data->hwmon_dev))
1244 return PTR_ERR(data->hwmon_dev);
1245
1246 dev_dbg(dev, "populating sysfs directory\n");
1247 err = atk_create_files(data);
1248 if (err)
1249 goto remove;
1250
1251 return 0;
1252 remove:
1253 /* Cleanup the registered files */
1254 atk_remove_files(data);
1255 hwmon_device_unregister(data->hwmon_dev);
1256 return err;
1257 }
1258
1259 static int atk_probe_if(struct atk_data *data)
1260 {
1261 struct device *dev = &data->acpi_dev->dev;
1262 acpi_handle ret;
1263 acpi_status status;
1264 int err = 0;
1265
1266 /* RTMP: read temperature */
1267 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
1268 if (ACPI_SUCCESS(status))
1269 data->rtmp_handle = ret;
1270 else
1271 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
1272 acpi_format_exception(status));
1273
1274 /* RVLT: read voltage */
1275 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
1276 if (ACPI_SUCCESS(status))
1277 data->rvlt_handle = ret;
1278 else
1279 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
1280 acpi_format_exception(status));
1281
1282 /* RFAN: read fan status */
1283 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
1284 if (ACPI_SUCCESS(status))
1285 data->rfan_handle = ret;
1286 else
1287 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
1288 acpi_format_exception(status));
1289
1290 /* Enumeration */
1291 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
1292 if (ACPI_SUCCESS(status))
1293 data->enumerate_handle = ret;
1294 else
1295 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
1296 acpi_format_exception(status));
1297
1298 /* De-multiplexer (read) */
1299 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
1300 if (ACPI_SUCCESS(status))
1301 data->read_handle = ret;
1302 else
1303 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
1304 acpi_format_exception(status));
1305
1306 /* De-multiplexer (write) */
1307 status = acpi_get_handle(data->atk_handle, METHOD_WRITE, &ret);
1308 if (ACPI_SUCCESS(status))
1309 data->write_handle = ret;
1310 else
1311 dev_dbg(dev, "method " METHOD_WRITE " not found: %s\n",
1312 acpi_format_exception(status));
1313
1314 /* Check for hwmon methods: first check "old" style methods; note that
1315 * both may be present: in this case we stick to the old interface;
1316 * analysis of multiple DSDTs indicates that when both interfaces
1317 * are present the new one (GGRP/GITM) is not functional.
1318 */
1319 if (new_if)
1320 dev_info(dev, "Overriding interface detection\n");
1321 if (data->rtmp_handle && data->rvlt_handle && data->rfan_handle && !new_if)
1322 data->old_interface = true;
1323 else if (data->enumerate_handle && data->read_handle &&
1324 data->write_handle)
1325 data->old_interface = false;
1326 else
1327 err = -ENODEV;
1328
1329 return err;
1330 }
1331
1332 static int atk_add(struct acpi_device *device)
1333 {
1334 acpi_status ret;
1335 int err;
1336 struct acpi_buffer buf;
1337 union acpi_object *obj;
1338 struct atk_data *data;
1339
1340 dev_dbg(&device->dev, "adding...\n");
1341
1342 data = kzalloc(sizeof(*data), GFP_KERNEL);
1343 if (!data)
1344 return -ENOMEM;
1345
1346 data->acpi_dev = device;
1347 data->atk_handle = device->handle;
1348 INIT_LIST_HEAD(&data->sensor_list);
1349 data->disable_ec = false;
1350
1351 buf.length = ACPI_ALLOCATE_BUFFER;
1352 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
1353 &buf, ACPI_TYPE_PACKAGE);
1354 if (ret != AE_OK) {
1355 dev_dbg(&device->dev, "atk: method MBIF not found\n");
1356 } else {
1357 obj = buf.pointer;
1358 if (obj->package.count >= 2) {
1359 union acpi_object *id = &obj->package.elements[1];
1360 if (id->type == ACPI_TYPE_STRING)
1361 dev_dbg(&device->dev, "board ID = %s\n",
1362 id->string.pointer);
1363 }
1364 ACPI_FREE(buf.pointer);
1365 }
1366
1367 err = atk_probe_if(data);
1368 if (err) {
1369 dev_err(&device->dev, "No usable hwmon interface detected\n");
1370 goto out;
1371 }
1372
1373 if (data->old_interface) {
1374 dev_dbg(&device->dev, "Using old hwmon interface\n");
1375 err = atk_enumerate_old_hwmon(data);
1376 } else {
1377 dev_dbg(&device->dev, "Using new hwmon interface\n");
1378 err = atk_enumerate_new_hwmon(data);
1379 }
1380 if (err < 0)
1381 goto out;
1382 if (err == 0) {
1383 dev_info(&device->dev,
1384 "No usable sensor detected, bailing out\n");
1385 err = -ENODEV;
1386 goto out;
1387 }
1388
1389 err = atk_register_hwmon(data);
1390 if (err)
1391 goto cleanup;
1392
1393 atk_debugfs_init(data);
1394
1395 device->driver_data = data;
1396 return 0;
1397 cleanup:
1398 atk_free_sensors(data);
1399 out:
1400 if (data->disable_ec)
1401 atk_ec_ctl(data, 0);
1402 kfree(data);
1403 return err;
1404 }
1405
1406 static int atk_remove(struct acpi_device *device, int type)
1407 {
1408 struct atk_data *data = device->driver_data;
1409 dev_dbg(&device->dev, "removing...\n");
1410
1411 device->driver_data = NULL;
1412
1413 atk_debugfs_cleanup(data);
1414
1415 atk_remove_files(data);
1416 atk_free_sensors(data);
1417 hwmon_device_unregister(data->hwmon_dev);
1418
1419 if (data->disable_ec) {
1420 if (atk_ec_ctl(data, 0))
1421 dev_err(&device->dev, "Failed to disable EC\n");
1422 }
1423
1424 kfree(data);
1425
1426 return 0;
1427 }
1428
1429 static int __init atk0110_init(void)
1430 {
1431 int ret;
1432
1433 /* Make sure it's safe to access the device through ACPI */
1434 if (!acpi_resources_are_enforced()) {
1435 pr_err("Resources not safely usable due to acpi_enforce_resources kernel parameter\n");
1436 return -EBUSY;
1437 }
1438
1439 if (dmi_check_system(atk_force_new_if))
1440 new_if = true;
1441
1442 ret = acpi_bus_register_driver(&atk_driver);
1443 if (ret)
1444 pr_info("acpi_bus_register_driver failed: %d\n", ret);
1445
1446 return ret;
1447 }
1448
1449 static void __exit atk0110_exit(void)
1450 {
1451 acpi_bus_unregister_driver(&atk_driver);
1452 }
1453
1454 module_init(atk0110_init);
1455 module_exit(atk0110_exit);
1456
1457 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree