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Linux 3.4.102
[linux/fpc-iii.git] / drivers / hwmon / asus_atk0110.c
blob4ee5789487233dbe6bf03920fa29fb820d366b8d
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 /* Old interface reads the same sensor for fan0 and fan1 */
39 .ident = "Asus M5A78L",
40 .matches = {
41 DMI_MATCH(DMI_BOARD_NAME, "M5A78L")
42 }
43 },
44 { }
45 };
46
47 /*
48 * Minimum time between readings, enforced in order to avoid
49 * hogging the CPU.
50 */
51 #define CACHE_TIME HZ
52
53 #define BOARD_ID "MBIF"
54 #define METHOD_ENUMERATE "GGRP"
55 #define METHOD_READ "GITM"
56 #define METHOD_WRITE "SITM"
57 #define METHOD_OLD_READ_TMP "RTMP"
58 #define METHOD_OLD_READ_VLT "RVLT"
59 #define METHOD_OLD_READ_FAN "RFAN"
60 #define METHOD_OLD_ENUM_TMP "TSIF"
61 #define METHOD_OLD_ENUM_VLT "VSIF"
62 #define METHOD_OLD_ENUM_FAN "FSIF"
63
64 #define ATK_MUX_HWMON 0x00000006ULL
65 #define ATK_MUX_MGMT 0x00000011ULL
66
67 #define ATK_CLASS_MASK 0xff000000ULL
68 #define ATK_CLASS_FREQ_CTL 0x03000000ULL
69 #define ATK_CLASS_FAN_CTL 0x04000000ULL
70 #define ATK_CLASS_HWMON 0x06000000ULL
71 #define ATK_CLASS_MGMT 0x11000000ULL
72
73 #define ATK_TYPE_MASK 0x00ff0000ULL
74 #define HWMON_TYPE_VOLT 0x00020000ULL
75 #define HWMON_TYPE_TEMP 0x00030000ULL
76 #define HWMON_TYPE_FAN 0x00040000ULL
77
78 #define ATK_ELEMENT_ID_MASK 0x0000ffffULL
79
80 #define ATK_EC_ID 0x11060004ULL
81
82 enum atk_pack_member {
83 HWMON_PACK_FLAGS,
84 HWMON_PACK_NAME,
85 HWMON_PACK_LIMIT1,
86 HWMON_PACK_LIMIT2,
87 HWMON_PACK_ENABLE
88 };
89
90 /* New package format */
91 #define _HWMON_NEW_PACK_SIZE 7
92 #define _HWMON_NEW_PACK_FLAGS 0
93 #define _HWMON_NEW_PACK_NAME 1
94 #define _HWMON_NEW_PACK_UNK1 2
95 #define _HWMON_NEW_PACK_UNK2 3
96 #define _HWMON_NEW_PACK_LIMIT1 4
97 #define _HWMON_NEW_PACK_LIMIT2 5
98 #define _HWMON_NEW_PACK_ENABLE 6
99
100 /* Old package format */
101 #define _HWMON_OLD_PACK_SIZE 5
102 #define _HWMON_OLD_PACK_FLAGS 0
103 #define _HWMON_OLD_PACK_NAME 1
104 #define _HWMON_OLD_PACK_LIMIT1 2
105 #define _HWMON_OLD_PACK_LIMIT2 3
106 #define _HWMON_OLD_PACK_ENABLE 4
107
108
109 struct atk_data {
110 struct device *hwmon_dev;
111 acpi_handle atk_handle;
112 struct acpi_device *acpi_dev;
113
114 bool old_interface;
115
116 /* old interface */
117 acpi_handle rtmp_handle;
118 acpi_handle rvlt_handle;
119 acpi_handle rfan_handle;
120 /* new inteface */
121 acpi_handle enumerate_handle;
122 acpi_handle read_handle;
123 acpi_handle write_handle;
124
125 bool disable_ec;
126
127 int voltage_count;
128 int temperature_count;
129 int fan_count;
130 struct list_head sensor_list;
131
132 struct {
133 struct dentry *root;
134 u32 id;
135 } debugfs;
136 };
137
138
139 typedef ssize_t (*sysfs_show_func)(struct device *dev,
140 struct device_attribute *attr, char *buf);
141
142 static const struct acpi_device_id atk_ids[] = {
143 {ATK_HID, 0},
144 {"", 0},
145 };
146 MODULE_DEVICE_TABLE(acpi, atk_ids);
147
148 #define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */
149
150 struct atk_sensor_data {
151 struct list_head list;
152 struct atk_data *data;
153 struct device_attribute label_attr;
154 struct device_attribute input_attr;
155 struct device_attribute limit1_attr;
156 struct device_attribute limit2_attr;
157 char label_attr_name[ATTR_NAME_SIZE];
158 char input_attr_name[ATTR_NAME_SIZE];
159 char limit1_attr_name[ATTR_NAME_SIZE];
160 char limit2_attr_name[ATTR_NAME_SIZE];
161 u64 id;
162 u64 type;
163 u64 limit1;
164 u64 limit2;
165 u64 cached_value;
166 unsigned long last_updated; /* in jiffies */
167 bool is_valid;
168 char const *acpi_name;
169 };
170
171 /*
172 * Return buffer format:
173 * [0-3] "value" is valid flag
174 * [4-7] value
175 * [8- ] unknown stuff on newer mobos
176 */
177 struct atk_acpi_ret_buffer {
178 u32 flags;
179 u32 value;
180 u8 data[];
181 };
182
183 /* Input buffer used for GITM and SITM methods */
184 struct atk_acpi_input_buf {
185 u32 id;
186 u32 param1;
187 u32 param2;
188 };
189
190 static int atk_add(struct acpi_device *device);
191 static int atk_remove(struct acpi_device *device, int type);
192 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
193 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
194 static void atk_free_sensors(struct atk_data *data);
195
196 static struct acpi_driver atk_driver = {
197 .name = ATK_HID,
198 .class = "hwmon",
199 .ids = atk_ids,
200 .ops = {
201 .add = atk_add,
202 .remove = atk_remove,
203 },
204 };
205
206 #define input_to_atk_sensor(attr) \
207 container_of(attr, struct atk_sensor_data, input_attr)
208
209 #define label_to_atk_sensor(attr) \
210 container_of(attr, struct atk_sensor_data, label_attr)
211
212 #define limit1_to_atk_sensor(attr) \
213 container_of(attr, struct atk_sensor_data, limit1_attr)
214
215 #define limit2_to_atk_sensor(attr) \
216 container_of(attr, struct atk_sensor_data, limit2_attr)
217
218 static ssize_t atk_input_show(struct device *dev,
219 struct device_attribute *attr, char *buf)
220 {
221 struct atk_sensor_data *s = input_to_atk_sensor(attr);
222 u64 value;
223 int err;
224
225 err = atk_read_value(s, &value);
226 if (err)
227 return err;
228
229 if (s->type == HWMON_TYPE_TEMP)
230 /* ACPI returns decidegree */
231 value *= 100;
232
233 return sprintf(buf, "%llu\n", value);
234 }
235
236 static ssize_t atk_label_show(struct device *dev,
237 struct device_attribute *attr, char *buf)
238 {
239 struct atk_sensor_data *s = label_to_atk_sensor(attr);
240
241 return sprintf(buf, "%s\n", s->acpi_name);
242 }
243
244 static ssize_t atk_limit1_show(struct device *dev,
245 struct device_attribute *attr, char *buf)
246 {
247 struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
248 u64 value = s->limit1;
249
250 if (s->type == HWMON_TYPE_TEMP)
251 value *= 100;
252
253 return sprintf(buf, "%lld\n", value);
254 }
255
256 static ssize_t atk_limit2_show(struct device *dev,
257 struct device_attribute *attr, char *buf)
258 {
259 struct atk_sensor_data *s = limit2_to_atk_sensor(attr);
260 u64 value = s->limit2;
261
262 if (s->type == HWMON_TYPE_TEMP)
263 value *= 100;
264
265 return sprintf(buf, "%lld\n", value);
266 }
267
268 static ssize_t atk_name_show(struct device *dev,
269 struct device_attribute *attr, char *buf)
270 {
271 return sprintf(buf, "atk0110\n");
272 }
273 static struct device_attribute atk_name_attr =
274 __ATTR(name, 0444, atk_name_show, NULL);
275
276 static void atk_init_attribute(struct device_attribute *attr, char *name,
277 sysfs_show_func show)
278 {
279 sysfs_attr_init(&attr->attr);
280 attr->attr.name = name;
281 attr->attr.mode = 0444;
282 attr->show = show;
283 attr->store = NULL;
284 }
285
286
287 static union acpi_object *atk_get_pack_member(struct atk_data *data,
288 union acpi_object *pack,
289 enum atk_pack_member m)
290 {
291 bool old_if = data->old_interface;
292 int offset;
293
294 switch (m) {
295 case HWMON_PACK_FLAGS:
296 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS;
297 break;
298 case HWMON_PACK_NAME:
299 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME;
300 break;
301 case HWMON_PACK_LIMIT1:
302 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 :
303 _HWMON_NEW_PACK_LIMIT1;
304 break;
305 case HWMON_PACK_LIMIT2:
306 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 :
307 _HWMON_NEW_PACK_LIMIT2;
308 break;
309 case HWMON_PACK_ENABLE:
310 offset = old_if ? _HWMON_OLD_PACK_ENABLE :
311 _HWMON_NEW_PACK_ENABLE;
312 break;
313 default:
314 return NULL;
315 }
316
317 return &pack->package.elements[offset];
318 }
319
320
321 /*
322 * New package format is:
323 * - flag (int)
324 * class - used for de-muxing the request to the correct GITn
325 * type (volt, temp, fan)
326 * sensor id |
327 * sensor id - used for de-muxing the request _inside_ the GITn
328 * - name (str)
329 * - unknown (int)
330 * - unknown (int)
331 * - limit1 (int)
332 * - limit2 (int)
333 * - enable (int)
334 *
335 * The old package has the same format but it's missing the two unknown fields.
336 */
337 static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj)
338 {
339 struct device *dev = &data->acpi_dev->dev;
340 union acpi_object *tmp;
341 bool old_if = data->old_interface;
342 int const expected_size = old_if ? _HWMON_OLD_PACK_SIZE :
343 _HWMON_NEW_PACK_SIZE;
344
345 if (obj->type != ACPI_TYPE_PACKAGE) {
346 dev_warn(dev, "Invalid type: %d\n", obj->type);
347 return -EINVAL;
348 }
349
350 if (obj->package.count != expected_size) {
351 dev_warn(dev, "Invalid package size: %d, expected: %d\n",
352 obj->package.count, expected_size);
353 return -EINVAL;
354 }
355
356 tmp = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
357 if (tmp->type != ACPI_TYPE_INTEGER) {
358 dev_warn(dev, "Invalid type (flag): %d\n", tmp->type);
359 return -EINVAL;
360 }
361
362 tmp = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
363 if (tmp->type != ACPI_TYPE_STRING) {
364 dev_warn(dev, "Invalid type (name): %d\n", tmp->type);
365 return -EINVAL;
366 }
367
368 /* Don't check... we don't know what they're useful for anyway */
369 #if 0
370 tmp = &obj->package.elements[HWMON_PACK_UNK1];
371 if (tmp->type != ACPI_TYPE_INTEGER) {
372 dev_warn(dev, "Invalid type (unk1): %d\n", tmp->type);
373 return -EINVAL;
374 }
375
376 tmp = &obj->package.elements[HWMON_PACK_UNK2];
377 if (tmp->type != ACPI_TYPE_INTEGER) {
378 dev_warn(dev, "Invalid type (unk2): %d\n", tmp->type);
379 return -EINVAL;
380 }
381 #endif
382
383 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
384 if (tmp->type != ACPI_TYPE_INTEGER) {
385 dev_warn(dev, "Invalid type (limit1): %d\n", tmp->type);
386 return -EINVAL;
387 }
388
389 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
390 if (tmp->type != ACPI_TYPE_INTEGER) {
391 dev_warn(dev, "Invalid type (limit2): %d\n", tmp->type);
392 return -EINVAL;
393 }
394
395 tmp = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
396 if (tmp->type != ACPI_TYPE_INTEGER) {
397 dev_warn(dev, "Invalid type (enable): %d\n", tmp->type);
398 return -EINVAL;
399 }
400
401 atk_print_sensor(data, obj);
402
403 return 0;
404 }
405
406 #ifdef DEBUG
407 static char const *atk_sensor_type(union acpi_object *flags)
408 {
409 u64 type = flags->integer.value & ATK_TYPE_MASK;
410 char const *what;
411
412 switch (type) {
413 case HWMON_TYPE_VOLT:
414 what = "voltage";
415 break;
416 case HWMON_TYPE_TEMP:
417 what = "temperature";
418 break;
419 case HWMON_TYPE_FAN:
420 what = "fan";
421 break;
422 default:
423 what = "unknown";
424 break;
425 }
426
427 return what;
428 }
429 #endif
430
431 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
432 {
433 #ifdef DEBUG
434 struct device *dev = &data->acpi_dev->dev;
435 union acpi_object *flags;
436 union acpi_object *name;
437 union acpi_object *limit1;
438 union acpi_object *limit2;
439 union acpi_object *enable;
440 char const *what;
441
442 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
443 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
444 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
445 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
446 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
447
448 what = atk_sensor_type(flags);
449
450 dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what,
451 flags->integer.value,
452 name->string.pointer,
453 limit1->integer.value, limit2->integer.value,
454 enable->integer.value ? "enabled" : "disabled");
455 #endif
456 }
457
458 static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
459 {
460 struct atk_data *data = sensor->data;
461 struct device *dev = &data->acpi_dev->dev;
462 struct acpi_object_list params;
463 union acpi_object id;
464 acpi_status status;
465 acpi_handle method;
466
467 switch (sensor->type) {
468 case HWMON_TYPE_VOLT:
469 method = data->rvlt_handle;
470 break;
471 case HWMON_TYPE_TEMP:
472 method = data->rtmp_handle;
473 break;
474 case HWMON_TYPE_FAN:
475 method = data->rfan_handle;
476 break;
477 default:
478 return -EINVAL;
479 }
480
481 id.type = ACPI_TYPE_INTEGER;
482 id.integer.value = sensor->id;
483
484 params.count = 1;
485 params.pointer = &id;
486
487 status = acpi_evaluate_integer(method, NULL, &params, value);
488 if (status != AE_OK) {
489 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
490 acpi_format_exception(status));
491 return -EIO;
492 }
493
494 return 0;
495 }
496
497 static union acpi_object *atk_ggrp(struct atk_data *data, u16 mux)
498 {
499 struct device *dev = &data->acpi_dev->dev;
500 struct acpi_buffer buf;
501 acpi_status ret;
502 struct acpi_object_list params;
503 union acpi_object id;
504 union acpi_object *pack;
505
506 id.type = ACPI_TYPE_INTEGER;
507 id.integer.value = mux;
508 params.count = 1;
509 params.pointer = &id;
510
511 buf.length = ACPI_ALLOCATE_BUFFER;
512 ret = acpi_evaluate_object(data->enumerate_handle, NULL, &params, &buf);
513 if (ret != AE_OK) {
514 dev_err(dev, "GGRP[%#x] ACPI exception: %s\n", mux,
515 acpi_format_exception(ret));
516 return ERR_PTR(-EIO);
517 }
518 pack = buf.pointer;
519 if (pack->type != ACPI_TYPE_PACKAGE) {
520 /* Execution was successful, but the id was not found */
521 ACPI_FREE(pack);
522 return ERR_PTR(-ENOENT);
523 }
524
525 if (pack->package.count < 1) {
526 dev_err(dev, "GGRP[%#x] package is too small\n", mux);
527 ACPI_FREE(pack);
528 return ERR_PTR(-EIO);
529 }
530 return pack;
531 }
532
533 static union acpi_object *atk_gitm(struct atk_data *data, u64 id)
534 {
535 struct device *dev = &data->acpi_dev->dev;
536 struct atk_acpi_input_buf buf;
537 union acpi_object tmp;
538 struct acpi_object_list params;
539 struct acpi_buffer ret;
540 union acpi_object *obj;
541 acpi_status status;
542
543 buf.id = id;
544 buf.param1 = 0;
545 buf.param2 = 0;
546
547 tmp.type = ACPI_TYPE_BUFFER;
548 tmp.buffer.pointer = (u8 *)&buf;
549 tmp.buffer.length = sizeof(buf);
550
551 params.count = 1;
552 params.pointer = (void *)&tmp;
553
554 ret.length = ACPI_ALLOCATE_BUFFER;
555 status = acpi_evaluate_object_typed(data->read_handle, NULL, &params,
556 &ret, ACPI_TYPE_BUFFER);
557 if (status != AE_OK) {
558 dev_warn(dev, "GITM[%#llx] ACPI exception: %s\n", id,
559 acpi_format_exception(status));
560 return ERR_PTR(-EIO);
561 }
562 obj = ret.pointer;
563
564 /* Sanity check */
565 if (obj->buffer.length < 8) {
566 dev_warn(dev, "Unexpected ASBF length: %u\n",
567 obj->buffer.length);
568 ACPI_FREE(obj);
569 return ERR_PTR(-EIO);
570 }
571 return obj;
572 }
573
574 static union acpi_object *atk_sitm(struct atk_data *data,
575 struct atk_acpi_input_buf *buf)
576 {
577 struct device *dev = &data->acpi_dev->dev;
578 struct acpi_object_list params;
579 union acpi_object tmp;
580 struct acpi_buffer ret;
581 union acpi_object *obj;
582 acpi_status status;
583
584 tmp.type = ACPI_TYPE_BUFFER;
585 tmp.buffer.pointer = (u8 *)buf;
586 tmp.buffer.length = sizeof(*buf);
587
588 params.count = 1;
589 params.pointer = &tmp;
590
591 ret.length = ACPI_ALLOCATE_BUFFER;
592 status = acpi_evaluate_object_typed(data->write_handle, NULL, &params,
593 &ret, ACPI_TYPE_BUFFER);
594 if (status != AE_OK) {
595 dev_warn(dev, "SITM[%#x] ACPI exception: %s\n", buf->id,
596 acpi_format_exception(status));
597 return ERR_PTR(-EIO);
598 }
599 obj = ret.pointer;
600
601 /* Sanity check */
602 if (obj->buffer.length < 8) {
603 dev_warn(dev, "Unexpected ASBF length: %u\n",
604 obj->buffer.length);
605 ACPI_FREE(obj);
606 return ERR_PTR(-EIO);
607 }
608 return obj;
609 }
610
611 static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
612 {
613 struct atk_data *data = sensor->data;
614 struct device *dev = &data->acpi_dev->dev;
615 union acpi_object *obj;
616 struct atk_acpi_ret_buffer *buf;
617 int err = 0;
618
619 obj = atk_gitm(data, sensor->id);
620 if (IS_ERR(obj))
621 return PTR_ERR(obj);
622
623 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
624 if (buf->flags == 0) {
625 /*
626 * The reading is not valid, possible causes:
627 * - sensor failure
628 * - enumeration was FUBAR (and we didn't notice)
629 */
630 dev_warn(dev, "Read failed, sensor = %#llx\n", sensor->id);
631 err = -EIO;
632 goto out;
633 }
634
635 *value = buf->value;
636 out:
637 ACPI_FREE(obj);
638 return err;
639 }
640
641 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
642 {
643 int err;
644
645 if (!sensor->is_valid ||
646 time_after(jiffies, sensor->last_updated + CACHE_TIME)) {
647 if (sensor->data->old_interface)
648 err = atk_read_value_old(sensor, value);
649 else
650 err = atk_read_value_new(sensor, value);
651
652 sensor->is_valid = true;
653 sensor->last_updated = jiffies;
654 sensor->cached_value = *value;
655 } else {
656 *value = sensor->cached_value;
657 err = 0;
658 }
659
660 return err;
661 }
662
663 #ifdef CONFIG_DEBUG_FS
664 static int atk_debugfs_gitm_get(void *p, u64 *val)
665 {
666 struct atk_data *data = p;
667 union acpi_object *ret;
668 struct atk_acpi_ret_buffer *buf;
669 int err = 0;
670
671 if (!data->read_handle)
672 return -ENODEV;
673
674 if (!data->debugfs.id)
675 return -EINVAL;
676
677 ret = atk_gitm(data, data->debugfs.id);
678 if (IS_ERR(ret))
679 return PTR_ERR(ret);
680
681 buf = (struct atk_acpi_ret_buffer *)ret->buffer.pointer;
682 if (buf->flags)
683 *val = buf->value;
684 else
685 err = -EIO;
686
687 ACPI_FREE(ret);
688 return err;
689 }
690
691 DEFINE_SIMPLE_ATTRIBUTE(atk_debugfs_gitm,
692 atk_debugfs_gitm_get,
693 NULL,
694 "0x%08llx\n")
695
696 static int atk_acpi_print(char *buf, size_t sz, union acpi_object *obj)
697 {
698 int ret = 0;
699
700 switch (obj->type) {
701 case ACPI_TYPE_INTEGER:
702 ret = snprintf(buf, sz, "0x%08llx\n", obj->integer.value);
703 break;
704 case ACPI_TYPE_STRING:
705 ret = snprintf(buf, sz, "%s\n", obj->string.pointer);
706 break;
707 }
708
709 return ret;
710 }
711
712 static void atk_pack_print(char *buf, size_t sz, union acpi_object *pack)
713 {
714 int ret;
715 int i;
716
717 for (i = 0; i < pack->package.count; i++) {
718 union acpi_object *obj = &pack->package.elements[i];
719
720 ret = atk_acpi_print(buf, sz, obj);
721 if (ret >= sz)
722 break;
723 buf += ret;
724 sz -= ret;
725 }
726 }
727
728 static int atk_debugfs_ggrp_open(struct inode *inode, struct file *file)
729 {
730 struct atk_data *data = inode->i_private;
731 char *buf = NULL;
732 union acpi_object *ret;
733 u8 cls;
734 int i;
735
736 if (!data->enumerate_handle)
737 return -ENODEV;
738 if (!data->debugfs.id)
739 return -EINVAL;
740
741 cls = (data->debugfs.id & 0xff000000) >> 24;
742 ret = atk_ggrp(data, cls);
743 if (IS_ERR(ret))
744 return PTR_ERR(ret);
745
746 for (i = 0; i < ret->package.count; i++) {
747 union acpi_object *pack = &ret->package.elements[i];
748 union acpi_object *id;
749
750 if (pack->type != ACPI_TYPE_PACKAGE)
751 continue;
752 if (!pack->package.count)
753 continue;
754 id = &pack->package.elements[0];
755 if (id->integer.value == data->debugfs.id) {
756 /* Print the package */
757 buf = kzalloc(512, GFP_KERNEL);
758 if (!buf) {
759 ACPI_FREE(ret);
760 return -ENOMEM;
761 }
762 atk_pack_print(buf, 512, pack);
763 break;
764 }
765 }
766 ACPI_FREE(ret);
767
768 if (!buf)
769 return -EINVAL;
770
771 file->private_data = buf;
772
773 return nonseekable_open(inode, file);
774 }
775
776 static ssize_t atk_debugfs_ggrp_read(struct file *file, char __user *buf,
777 size_t count, loff_t *pos)
778 {
779 char *str = file->private_data;
780 size_t len = strlen(str);
781
782 return simple_read_from_buffer(buf, count, pos, str, len);
783 }
784
785 static int atk_debugfs_ggrp_release(struct inode *inode, struct file *file)
786 {
787 kfree(file->private_data);
788 return 0;
789 }
790
791 static const struct file_operations atk_debugfs_ggrp_fops = {
792 .read = atk_debugfs_ggrp_read,
793 .open = atk_debugfs_ggrp_open,
794 .release = atk_debugfs_ggrp_release,
795 .llseek = no_llseek,
796 };
797
798 static void atk_debugfs_init(struct atk_data *data)
799 {
800 struct dentry *d;
801 struct dentry *f;
802
803 data->debugfs.id = 0;
804
805 d = debugfs_create_dir("asus_atk0110", NULL);
806 if (!d || IS_ERR(d))
807 return;
808
809 f = debugfs_create_x32("id", S_IRUSR | S_IWUSR, d, &data->debugfs.id);
810 if (!f || IS_ERR(f))
811 goto cleanup;
812
813 f = debugfs_create_file("gitm", S_IRUSR, d, data,
814 &atk_debugfs_gitm);
815 if (!f || IS_ERR(f))
816 goto cleanup;
817
818 f = debugfs_create_file("ggrp", S_IRUSR, d, data,
819 &atk_debugfs_ggrp_fops);
820 if (!f || IS_ERR(f))
821 goto cleanup;
822
823 data->debugfs.root = d;
824
825 return;
826 cleanup:
827 debugfs_remove_recursive(d);
828 }
829
830 static void atk_debugfs_cleanup(struct atk_data *data)
831 {
832 debugfs_remove_recursive(data->debugfs.root);
833 }
834
835 #else /* CONFIG_DEBUG_FS */
836
837 static void atk_debugfs_init(struct atk_data *data)
838 {
839 }
840
841 static void atk_debugfs_cleanup(struct atk_data *data)
842 {
843 }
844 #endif
845
846 static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
847 {
848 struct device *dev = &data->acpi_dev->dev;
849 union acpi_object *flags;
850 union acpi_object *name;
851 union acpi_object *limit1;
852 union acpi_object *limit2;
853 union acpi_object *enable;
854 struct atk_sensor_data *sensor;
855 char const *base_name;
856 char const *limit1_name;
857 char const *limit2_name;
858 u64 type;
859 int err;
860 int *num;
861 int start;
862
863 if (obj->type != ACPI_TYPE_PACKAGE) {
864 /* wft is this? */
865 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
866 obj->type);
867 return -EINVAL;
868 }
869
870 err = validate_hwmon_pack(data, obj);
871 if (err)
872 return err;
873
874 /* Ok, we have a valid hwmon package */
875 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
876 & ATK_TYPE_MASK;
877
878 switch (type) {
879 case HWMON_TYPE_VOLT:
880 base_name = "in";
881 limit1_name = "min";
882 limit2_name = "max";
883 num = &data->voltage_count;
884 start = 0;
885 break;
886 case HWMON_TYPE_TEMP:
887 base_name = "temp";
888 limit1_name = "max";
889 limit2_name = "crit";
890 num = &data->temperature_count;
891 start = 1;
892 break;
893 case HWMON_TYPE_FAN:
894 base_name = "fan";
895 limit1_name = "min";
896 limit2_name = "max";
897 num = &data->fan_count;
898 start = 1;
899 break;
900 default:
901 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
902 return -EINVAL;
903 }
904
905 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
906 if (!enable->integer.value)
907 /* sensor is disabled */
908 return 0;
909
910 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
911 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
912 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
913 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
914
915 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
916 if (!sensor)
917 return -ENOMEM;
918
919 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
920 if (!sensor->acpi_name) {
921 err = -ENOMEM;
922 goto out;
923 }
924
925 INIT_LIST_HEAD(&sensor->list);
926 sensor->type = type;
927 sensor->data = data;
928 sensor->id = flags->integer.value;
929 sensor->limit1 = limit1->integer.value;
930 if (data->old_interface)
931 sensor->limit2 = limit2->integer.value;
932 else
933 /* The upper limit is expressed as delta from lower limit */
934 sensor->limit2 = sensor->limit1 + limit2->integer.value;
935
936 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
937 "%s%d_input", base_name, start + *num);
938 atk_init_attribute(&sensor->input_attr,
939 sensor->input_attr_name,
940 atk_input_show);
941
942 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
943 "%s%d_label", base_name, start + *num);
944 atk_init_attribute(&sensor->label_attr,
945 sensor->label_attr_name,
946 atk_label_show);
947
948 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
949 "%s%d_%s", base_name, start + *num, limit1_name);
950 atk_init_attribute(&sensor->limit1_attr,
951 sensor->limit1_attr_name,
952 atk_limit1_show);
953
954 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
955 "%s%d_%s", base_name, start + *num, limit2_name);
956 atk_init_attribute(&sensor->limit2_attr,
957 sensor->limit2_attr_name,
958 atk_limit2_show);
959
960 list_add(&sensor->list, &data->sensor_list);
961 (*num)++;
962
963 return 1;
964 out:
965 kfree(sensor->acpi_name);
966 kfree(sensor);
967 return err;
968 }
969
970 static int atk_enumerate_old_hwmon(struct atk_data *data)
971 {
972 struct device *dev = &data->acpi_dev->dev;
973 struct acpi_buffer buf;
974 union acpi_object *pack;
975 acpi_status status;
976 int i, ret;
977 int count = 0;
978
979 /* Voltages */
980 buf.length = ACPI_ALLOCATE_BUFFER;
981 status = acpi_evaluate_object_typed(data->atk_handle,
982 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
983 if (status != AE_OK) {
984 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
985 acpi_format_exception(status));
986
987 return -ENODEV;
988 }
989
990 pack = buf.pointer;
991 for (i = 1; i < pack->package.count; i++) {
992 union acpi_object *obj = &pack->package.elements[i];
993
994 ret = atk_add_sensor(data, obj);
995 if (ret > 0)
996 count++;
997 }
998 ACPI_FREE(buf.pointer);
999
1000 /* Temperatures */
1001 buf.length = ACPI_ALLOCATE_BUFFER;
1002 status = acpi_evaluate_object_typed(data->atk_handle,
1003 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
1004 if (status != AE_OK) {
1005 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
1006 acpi_format_exception(status));
1007
1008 ret = -ENODEV;
1009 goto cleanup;
1010 }
1011
1012 pack = buf.pointer;
1013 for (i = 1; i < pack->package.count; i++) {
1014 union acpi_object *obj = &pack->package.elements[i];
1015
1016 ret = atk_add_sensor(data, obj);
1017 if (ret > 0)
1018 count++;
1019 }
1020 ACPI_FREE(buf.pointer);
1021
1022 /* Fans */
1023 buf.length = ACPI_ALLOCATE_BUFFER;
1024 status = acpi_evaluate_object_typed(data->atk_handle,
1025 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
1026 if (status != AE_OK) {
1027 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
1028 acpi_format_exception(status));
1029
1030 ret = -ENODEV;
1031 goto cleanup;
1032 }
1033
1034 pack = buf.pointer;
1035 for (i = 1; i < pack->package.count; i++) {
1036 union acpi_object *obj = &pack->package.elements[i];
1037
1038 ret = atk_add_sensor(data, obj);
1039 if (ret > 0)
1040 count++;
1041 }
1042 ACPI_FREE(buf.pointer);
1043
1044 return count;
1045 cleanup:
1046 atk_free_sensors(data);
1047 return ret;
1048 }
1049
1050 static int atk_ec_present(struct atk_data *data)
1051 {
1052 struct device *dev = &data->acpi_dev->dev;
1053 union acpi_object *pack;
1054 union acpi_object *ec;
1055 int ret;
1056 int i;
1057
1058 pack = atk_ggrp(data, ATK_MUX_MGMT);
1059 if (IS_ERR(pack)) {
1060 if (PTR_ERR(pack) == -ENOENT) {
1061 /* The MGMT class does not exists - that's ok */
1062 dev_dbg(dev, "Class %#llx not found\n", ATK_MUX_MGMT);
1063 return 0;
1064 }
1065 return PTR_ERR(pack);
1066 }
1067
1068 /* Search the EC */
1069 ec = NULL;
1070 for (i = 0; i < pack->package.count; i++) {
1071 union acpi_object *obj = &pack->package.elements[i];
1072 union acpi_object *id;
1073
1074 if (obj->type != ACPI_TYPE_PACKAGE)
1075 continue;
1076
1077 id = &obj->package.elements[0];
1078 if (id->type != ACPI_TYPE_INTEGER)
1079 continue;
1080
1081 if (id->integer.value == ATK_EC_ID) {
1082 ec = obj;
1083 break;
1084 }
1085 }
1086
1087 ret = (ec != NULL);
1088 if (!ret)
1089 /* The system has no EC */
1090 dev_dbg(dev, "EC not found\n");
1091
1092 ACPI_FREE(pack);
1093 return ret;
1094 }
1095
1096 static int atk_ec_enabled(struct atk_data *data)
1097 {
1098 struct device *dev = &data->acpi_dev->dev;
1099 union acpi_object *obj;
1100 struct atk_acpi_ret_buffer *buf;
1101 int err;
1102
1103 obj = atk_gitm(data, ATK_EC_ID);
1104 if (IS_ERR(obj)) {
1105 dev_err(dev, "Unable to query EC status\n");
1106 return PTR_ERR(obj);
1107 }
1108 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1109
1110 if (buf->flags == 0) {
1111 dev_err(dev, "Unable to query EC status\n");
1112 err = -EIO;
1113 } else {
1114 err = (buf->value != 0);
1115 dev_dbg(dev, "EC is %sabled\n",
1116 err ? "en" : "dis");
1117 }
1118
1119 ACPI_FREE(obj);
1120 return err;
1121 }
1122
1123 static int atk_ec_ctl(struct atk_data *data, int enable)
1124 {
1125 struct device *dev = &data->acpi_dev->dev;
1126 union acpi_object *obj;
1127 struct atk_acpi_input_buf sitm;
1128 struct atk_acpi_ret_buffer *ec_ret;
1129 int err = 0;
1130
1131 sitm.id = ATK_EC_ID;
1132 sitm.param1 = enable;
1133 sitm.param2 = 0;
1134
1135 obj = atk_sitm(data, &sitm);
1136 if (IS_ERR(obj)) {
1137 dev_err(dev, "Failed to %sable the EC\n",
1138 enable ? "en" : "dis");
1139 return PTR_ERR(obj);
1140 }
1141 ec_ret = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1142 if (ec_ret->flags == 0) {
1143 dev_err(dev, "Failed to %sable the EC\n",
1144 enable ? "en" : "dis");
1145 err = -EIO;
1146 } else {
1147 dev_info(dev, "EC %sabled\n",
1148 enable ? "en" : "dis");
1149 }
1150
1151 ACPI_FREE(obj);
1152 return err;
1153 }
1154
1155 static int atk_enumerate_new_hwmon(struct atk_data *data)
1156 {
1157 struct device *dev = &data->acpi_dev->dev;
1158 union acpi_object *pack;
1159 int err;
1160 int i;
1161
1162 err = atk_ec_present(data);
1163 if (err < 0)
1164 return err;
1165 if (err) {
1166 err = atk_ec_enabled(data);
1167 if (err < 0)
1168 return err;
1169 /* If the EC was disabled we will disable it again on unload */
1170 data->disable_ec = err;
1171
1172 err = atk_ec_ctl(data, 1);
1173 if (err) {
1174 data->disable_ec = false;
1175 return err;
1176 }
1177 }
1178
1179 dev_dbg(dev, "Enumerating hwmon sensors\n");
1180
1181 pack = atk_ggrp(data, ATK_MUX_HWMON);
1182 if (IS_ERR(pack))
1183 return PTR_ERR(pack);
1184
1185 for (i = 0; i < pack->package.count; i++) {
1186 union acpi_object *obj = &pack->package.elements[i];
1187
1188 atk_add_sensor(data, obj);
1189 }
1190
1191 err = data->voltage_count + data->temperature_count + data->fan_count;
1192
1193 ACPI_FREE(pack);
1194 return err;
1195 }
1196
1197 static int atk_create_files(struct atk_data *data)
1198 {
1199 struct atk_sensor_data *s;
1200 int err;
1201
1202 list_for_each_entry(s, &data->sensor_list, list) {
1203 err = device_create_file(data->hwmon_dev, &s->input_attr);
1204 if (err)
1205 return err;
1206 err = device_create_file(data->hwmon_dev, &s->label_attr);
1207 if (err)
1208 return err;
1209 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
1210 if (err)
1211 return err;
1212 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
1213 if (err)
1214 return err;
1215 }
1216
1217 err = device_create_file(data->hwmon_dev, &atk_name_attr);
1218
1219 return err;
1220 }
1221
1222 static void atk_remove_files(struct atk_data *data)
1223 {
1224 struct atk_sensor_data *s;
1225
1226 list_for_each_entry(s, &data->sensor_list, list) {
1227 device_remove_file(data->hwmon_dev, &s->input_attr);
1228 device_remove_file(data->hwmon_dev, &s->label_attr);
1229 device_remove_file(data->hwmon_dev, &s->limit1_attr);
1230 device_remove_file(data->hwmon_dev, &s->limit2_attr);
1231 }
1232 device_remove_file(data->hwmon_dev, &atk_name_attr);
1233 }
1234
1235 static void atk_free_sensors(struct atk_data *data)
1236 {
1237 struct list_head *head = &data->sensor_list;
1238 struct atk_sensor_data *s, *tmp;
1239
1240 list_for_each_entry_safe(s, tmp, head, list) {
1241 kfree(s->acpi_name);
1242 kfree(s);
1243 }
1244 }
1245
1246 static int atk_register_hwmon(struct atk_data *data)
1247 {
1248 struct device *dev = &data->acpi_dev->dev;
1249 int err;
1250
1251 dev_dbg(dev, "registering hwmon device\n");
1252 data->hwmon_dev = hwmon_device_register(dev);
1253 if (IS_ERR(data->hwmon_dev))
1254 return PTR_ERR(data->hwmon_dev);
1255
1256 dev_dbg(dev, "populating sysfs directory\n");
1257 err = atk_create_files(data);
1258 if (err)
1259 goto remove;
1260
1261 return 0;
1262 remove:
1263 /* Cleanup the registered files */
1264 atk_remove_files(data);
1265 hwmon_device_unregister(data->hwmon_dev);
1266 return err;
1267 }
1268
1269 static int atk_probe_if(struct atk_data *data)
1270 {
1271 struct device *dev = &data->acpi_dev->dev;
1272 acpi_handle ret;
1273 acpi_status status;
1274 int err = 0;
1275
1276 /* RTMP: read temperature */
1277 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
1278 if (ACPI_SUCCESS(status))
1279 data->rtmp_handle = ret;
1280 else
1281 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
1282 acpi_format_exception(status));
1283
1284 /* RVLT: read voltage */
1285 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
1286 if (ACPI_SUCCESS(status))
1287 data->rvlt_handle = ret;
1288 else
1289 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
1290 acpi_format_exception(status));
1291
1292 /* RFAN: read fan status */
1293 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
1294 if (ACPI_SUCCESS(status))
1295 data->rfan_handle = ret;
1296 else
1297 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
1298 acpi_format_exception(status));
1299
1300 /* Enumeration */
1301 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
1302 if (ACPI_SUCCESS(status))
1303 data->enumerate_handle = ret;
1304 else
1305 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
1306 acpi_format_exception(status));
1307
1308 /* De-multiplexer (read) */
1309 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
1310 if (ACPI_SUCCESS(status))
1311 data->read_handle = ret;
1312 else
1313 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
1314 acpi_format_exception(status));
1315
1316 /* De-multiplexer (write) */
1317 status = acpi_get_handle(data->atk_handle, METHOD_WRITE, &ret);
1318 if (ACPI_SUCCESS(status))
1319 data->write_handle = ret;
1320 else
1321 dev_dbg(dev, "method " METHOD_WRITE " not found: %s\n",
1322 acpi_format_exception(status));
1323
1324 /*
1325 * Check for hwmon methods: first check "old" style methods; note that
1326 * both may be present: in this case we stick to the old interface;
1327 * analysis of multiple DSDTs indicates that when both interfaces
1328 * are present the new one (GGRP/GITM) is not functional.
1329 */
1330 if (new_if)
1331 dev_info(dev, "Overriding interface detection\n");
1332 if (data->rtmp_handle &&
1333 data->rvlt_handle && data->rfan_handle && !new_if)
1334 data->old_interface = true;
1335 else if (data->enumerate_handle && data->read_handle &&
1336 data->write_handle)
1337 data->old_interface = false;
1338 else
1339 err = -ENODEV;
1340
1341 return err;
1342 }
1343
1344 static int atk_add(struct acpi_device *device)
1345 {
1346 acpi_status ret;
1347 int err;
1348 struct acpi_buffer buf;
1349 union acpi_object *obj;
1350 struct atk_data *data;
1351
1352 dev_dbg(&device->dev, "adding...\n");
1353
1354 data = kzalloc(sizeof(*data), GFP_KERNEL);
1355 if (!data)
1356 return -ENOMEM;
1357
1358 data->acpi_dev = device;
1359 data->atk_handle = device->handle;
1360 INIT_LIST_HEAD(&data->sensor_list);
1361 data->disable_ec = false;
1362
1363 buf.length = ACPI_ALLOCATE_BUFFER;
1364 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
1365 &buf, ACPI_TYPE_PACKAGE);
1366 if (ret != AE_OK) {
1367 dev_dbg(&device->dev, "atk: method MBIF not found\n");
1368 } else {
1369 obj = buf.pointer;
1370 if (obj->package.count >= 2) {
1371 union acpi_object *id = &obj->package.elements[1];
1372 if (id->type == ACPI_TYPE_STRING)
1373 dev_dbg(&device->dev, "board ID = %s\n",
1374 id->string.pointer);
1375 }
1376 ACPI_FREE(buf.pointer);
1377 }
1378
1379 err = atk_probe_if(data);
1380 if (err) {
1381 dev_err(&device->dev, "No usable hwmon interface detected\n");
1382 goto out;
1383 }
1384
1385 if (data->old_interface) {
1386 dev_dbg(&device->dev, "Using old hwmon interface\n");
1387 err = atk_enumerate_old_hwmon(data);
1388 } else {
1389 dev_dbg(&device->dev, "Using new hwmon interface\n");
1390 err = atk_enumerate_new_hwmon(data);
1391 }
1392 if (err < 0)
1393 goto out;
1394 if (err == 0) {
1395 dev_info(&device->dev,
1396 "No usable sensor detected, bailing out\n");
1397 err = -ENODEV;
1398 goto out;
1399 }
1400
1401 err = atk_register_hwmon(data);
1402 if (err)
1403 goto cleanup;
1404
1405 atk_debugfs_init(data);
1406
1407 device->driver_data = data;
1408 return 0;
1409 cleanup:
1410 atk_free_sensors(data);
1411 out:
1412 if (data->disable_ec)
1413 atk_ec_ctl(data, 0);
1414 kfree(data);
1415 return err;
1416 }
1417
1418 static int atk_remove(struct acpi_device *device, int type)
1419 {
1420 struct atk_data *data = device->driver_data;
1421 dev_dbg(&device->dev, "removing...\n");
1422
1423 device->driver_data = NULL;
1424
1425 atk_debugfs_cleanup(data);
1426
1427 atk_remove_files(data);
1428 atk_free_sensors(data);
1429 hwmon_device_unregister(data->hwmon_dev);
1430
1431 if (data->disable_ec) {
1432 if (atk_ec_ctl(data, 0))
1433 dev_err(&device->dev, "Failed to disable EC\n");
1434 }
1435
1436 kfree(data);
1437
1438 return 0;
1439 }
1440
1441 static int __init atk0110_init(void)
1442 {
1443 int ret;
1444
1445 /* Make sure it's safe to access the device through ACPI */
1446 if (!acpi_resources_are_enforced()) {
1447 pr_err("Resources not safely usable due to acpi_enforce_resources kernel parameter\n");
1448 return -EBUSY;
1449 }
1450
1451 if (dmi_check_system(atk_force_new_if))
1452 new_if = true;
1453
1454 ret = acpi_bus_register_driver(&atk_driver);
1455 if (ret)
1456 pr_info("acpi_bus_register_driver failed: %d\n", ret);
1457
1458 return ret;
1459 }
1460
1461 static void __exit atk0110_exit(void)
1462 {
1463 acpi_bus_unregister_driver(&atk_driver);
1464 }
1465
1466 module_init(atk0110_init);
1467 module_exit(atk0110_exit);
1468
1469 MODULE_LICENSE("GPL");
Linux with added FPC-III support