?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
of: MSI: Simplify irqdomain lookup
[linux/fpc-iii.git] / drivers / hwmon / asus_atk0110.c
blobcccef87963e050afb99181d63d3ed5dcf401d5a1
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 #include <linux/jiffies.h>
18 #include <linux/err.h>
19 #include <linux/acpi.h>
20
21 #define ATK_HID "ATK0110"
22
23 static bool new_if;
24 module_param(new_if, bool, 0);
25 MODULE_PARM_DESC(new_if, "Override detection heuristic and force the use of the new ATK0110 interface");
26
27 static const struct dmi_system_id __initconst atk_force_new_if[] = {
28 {
29 /* Old interface has broken MCH temp monitoring */
30 .ident = "Asus Sabertooth X58",
31 .matches = {
32 DMI_MATCH(DMI_BOARD_NAME, "SABERTOOTH X58")
33 }
34 }, {
35 /* Old interface reads the same sensor for fan0 and fan1 */
36 .ident = "Asus M5A78L",
37 .matches = {
38 DMI_MATCH(DMI_BOARD_NAME, "M5A78L")
39 }
40 },
41 { }
42 };
43
44 /*
45 * Minimum time between readings, enforced in order to avoid
46 * hogging the CPU.
47 */
48 #define CACHE_TIME HZ
49
50 #define BOARD_ID "MBIF"
51 #define METHOD_ENUMERATE "GGRP"
52 #define METHOD_READ "GITM"
53 #define METHOD_WRITE "SITM"
54 #define METHOD_OLD_READ_TMP "RTMP"
55 #define METHOD_OLD_READ_VLT "RVLT"
56 #define METHOD_OLD_READ_FAN "RFAN"
57 #define METHOD_OLD_ENUM_TMP "TSIF"
58 #define METHOD_OLD_ENUM_VLT "VSIF"
59 #define METHOD_OLD_ENUM_FAN "FSIF"
60
61 #define ATK_MUX_HWMON 0x00000006ULL
62 #define ATK_MUX_MGMT 0x00000011ULL
63
64 #define ATK_CLASS_MASK 0xff000000ULL
65 #define ATK_CLASS_FREQ_CTL 0x03000000ULL
66 #define ATK_CLASS_FAN_CTL 0x04000000ULL
67 #define ATK_CLASS_HWMON 0x06000000ULL
68 #define ATK_CLASS_MGMT 0x11000000ULL
69
70 #define ATK_TYPE_MASK 0x00ff0000ULL
71 #define HWMON_TYPE_VOLT 0x00020000ULL
72 #define HWMON_TYPE_TEMP 0x00030000ULL
73 #define HWMON_TYPE_FAN 0x00040000ULL
74
75 #define ATK_ELEMENT_ID_MASK 0x0000ffffULL
76
77 #define ATK_EC_ID 0x11060004ULL
78
79 enum atk_pack_member {
80 HWMON_PACK_FLAGS,
81 HWMON_PACK_NAME,
82 HWMON_PACK_LIMIT1,
83 HWMON_PACK_LIMIT2,
84 HWMON_PACK_ENABLE
85 };
86
87 /* New package format */
88 #define _HWMON_NEW_PACK_SIZE 7
89 #define _HWMON_NEW_PACK_FLAGS 0
90 #define _HWMON_NEW_PACK_NAME 1
91 #define _HWMON_NEW_PACK_UNK1 2
92 #define _HWMON_NEW_PACK_UNK2 3
93 #define _HWMON_NEW_PACK_LIMIT1 4
94 #define _HWMON_NEW_PACK_LIMIT2 5
95 #define _HWMON_NEW_PACK_ENABLE 6
96
97 /* Old package format */
98 #define _HWMON_OLD_PACK_SIZE 5
99 #define _HWMON_OLD_PACK_FLAGS 0
100 #define _HWMON_OLD_PACK_NAME 1
101 #define _HWMON_OLD_PACK_LIMIT1 2
102 #define _HWMON_OLD_PACK_LIMIT2 3
103 #define _HWMON_OLD_PACK_ENABLE 4
104
105
106 struct atk_data {
107 struct device *hwmon_dev;
108 acpi_handle atk_handle;
109 struct acpi_device *acpi_dev;
110
111 bool old_interface;
112
113 /* old interface */
114 acpi_handle rtmp_handle;
115 acpi_handle rvlt_handle;
116 acpi_handle rfan_handle;
117 /* new interface */
118 acpi_handle enumerate_handle;
119 acpi_handle read_handle;
120 acpi_handle write_handle;
121
122 bool disable_ec;
123
124 int voltage_count;
125 int temperature_count;
126 int fan_count;
127 struct list_head sensor_list;
128
129 struct {
130 struct dentry *root;
131 u32 id;
132 } debugfs;
133 };
134
135
136 typedef ssize_t (*sysfs_show_func)(struct device *dev,
137 struct device_attribute *attr, char *buf);
138
139 static const struct acpi_device_id atk_ids[] = {
140 {ATK_HID, 0},
141 {"", 0},
142 };
143 MODULE_DEVICE_TABLE(acpi, atk_ids);
144
145 #define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */
146
147 struct atk_sensor_data {
148 struct list_head list;
149 struct atk_data *data;
150 struct device_attribute label_attr;
151 struct device_attribute input_attr;
152 struct device_attribute limit1_attr;
153 struct device_attribute limit2_attr;
154 char label_attr_name[ATTR_NAME_SIZE];
155 char input_attr_name[ATTR_NAME_SIZE];
156 char limit1_attr_name[ATTR_NAME_SIZE];
157 char limit2_attr_name[ATTR_NAME_SIZE];
158 u64 id;
159 u64 type;
160 u64 limit1;
161 u64 limit2;
162 u64 cached_value;
163 unsigned long last_updated; /* in jiffies */
164 bool is_valid;
165 char const *acpi_name;
166 };
167
168 /*
169 * Return buffer format:
170 * [0-3] "value" is valid flag
171 * [4-7] value
172 * [8- ] unknown stuff on newer mobos
173 */
174 struct atk_acpi_ret_buffer {
175 u32 flags;
176 u32 value;
177 u8 data[];
178 };
179
180 /* Input buffer used for GITM and SITM methods */
181 struct atk_acpi_input_buf {
182 u32 id;
183 u32 param1;
184 u32 param2;
185 };
186
187 static int atk_add(struct acpi_device *device);
188 static int atk_remove(struct acpi_device *device);
189 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
190 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
191 static void atk_free_sensors(struct atk_data *data);
192
193 static struct acpi_driver atk_driver = {
194 .name = ATK_HID,
195 .class = "hwmon",
196 .ids = atk_ids,
197 .ops = {
198 .add = atk_add,
199 .remove = atk_remove,
200 },
201 };
202
203 #define input_to_atk_sensor(attr) \
204 container_of(attr, struct atk_sensor_data, input_attr)
205
206 #define label_to_atk_sensor(attr) \
207 container_of(attr, struct atk_sensor_data, label_attr)
208
209 #define limit1_to_atk_sensor(attr) \
210 container_of(attr, struct atk_sensor_data, limit1_attr)
211
212 #define limit2_to_atk_sensor(attr) \
213 container_of(attr, struct atk_sensor_data, limit2_attr)
214
215 static ssize_t atk_input_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
217 {
218 struct atk_sensor_data *s = input_to_atk_sensor(attr);
219 u64 value;
220 int err;
221
222 err = atk_read_value(s, &value);
223 if (err)
224 return err;
225
226 if (s->type == HWMON_TYPE_TEMP)
227 /* ACPI returns decidegree */
228 value *= 100;
229
230 return sprintf(buf, "%llu\n", value);
231 }
232
233 static ssize_t atk_label_show(struct device *dev,
234 struct device_attribute *attr, char *buf)
235 {
236 struct atk_sensor_data *s = label_to_atk_sensor(attr);
237
238 return sprintf(buf, "%s\n", s->acpi_name);
239 }
240
241 static ssize_t atk_limit1_show(struct device *dev,
242 struct device_attribute *attr, char *buf)
243 {
244 struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
245 u64 value = s->limit1;
246
247 if (s->type == HWMON_TYPE_TEMP)
248 value *= 100;
249
250 return sprintf(buf, "%lld\n", value);
251 }
252
253 static ssize_t atk_limit2_show(struct device *dev,
254 struct device_attribute *attr, char *buf)
255 {
256 struct atk_sensor_data *s = limit2_to_atk_sensor(attr);
257 u64 value = s->limit2;
258
259 if (s->type == HWMON_TYPE_TEMP)
260 value *= 100;
261
262 return sprintf(buf, "%lld\n", value);
263 }
264
265 static ssize_t atk_name_show(struct device *dev,
266 struct device_attribute *attr, char *buf)
267 {
268 return sprintf(buf, "atk0110\n");
269 }
270 static struct device_attribute atk_name_attr =
271 __ATTR(name, 0444, atk_name_show, NULL);
272
273 static void atk_init_attribute(struct device_attribute *attr, char *name,
274 sysfs_show_func show)
275 {
276 sysfs_attr_init(&attr->attr);
277 attr->attr.name = name;
278 attr->attr.mode = 0444;
279 attr->show = show;
280 attr->store = NULL;
281 }
282
283
284 static union acpi_object *atk_get_pack_member(struct atk_data *data,
285 union acpi_object *pack,
286 enum atk_pack_member m)
287 {
288 bool old_if = data->old_interface;
289 int offset;
290
291 switch (m) {
292 case HWMON_PACK_FLAGS:
293 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS;
294 break;
295 case HWMON_PACK_NAME:
296 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME;
297 break;
298 case HWMON_PACK_LIMIT1:
299 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 :
300 _HWMON_NEW_PACK_LIMIT1;
301 break;
302 case HWMON_PACK_LIMIT2:
303 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 :
304 _HWMON_NEW_PACK_LIMIT2;
305 break;
306 case HWMON_PACK_ENABLE:
307 offset = old_if ? _HWMON_OLD_PACK_ENABLE :
308 _HWMON_NEW_PACK_ENABLE;
309 break;
310 default:
311 return NULL;
312 }
313
314 return &pack->package.elements[offset];
315 }
316
317
318 /*
319 * New package format is:
320 * - flag (int)
321 * class - used for de-muxing the request to the correct GITn
322 * type (volt, temp, fan)
323 * sensor id |
324 * sensor id - used for de-muxing the request _inside_ the GITn
325 * - name (str)
326 * - unknown (int)
327 * - unknown (int)
328 * - limit1 (int)
329 * - limit2 (int)
330 * - enable (int)
331 *
332 * The old package has the same format but it's missing the two unknown fields.
333 */
334 static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj)
335 {
336 struct device *dev = &data->acpi_dev->dev;
337 union acpi_object *tmp;
338 bool old_if = data->old_interface;
339 int const expected_size = old_if ? _HWMON_OLD_PACK_SIZE :
340 _HWMON_NEW_PACK_SIZE;
341
342 if (obj->type != ACPI_TYPE_PACKAGE) {
343 dev_warn(dev, "Invalid type: %d\n", obj->type);
344 return -EINVAL;
345 }
346
347 if (obj->package.count != expected_size) {
348 dev_warn(dev, "Invalid package size: %d, expected: %d\n",
349 obj->package.count, expected_size);
350 return -EINVAL;
351 }
352
353 tmp = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
354 if (tmp->type != ACPI_TYPE_INTEGER) {
355 dev_warn(dev, "Invalid type (flag): %d\n", tmp->type);
356 return -EINVAL;
357 }
358
359 tmp = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
360 if (tmp->type != ACPI_TYPE_STRING) {
361 dev_warn(dev, "Invalid type (name): %d\n", tmp->type);
362 return -EINVAL;
363 }
364
365 /* Don't check... we don't know what they're useful for anyway */
366 #if 0
367 tmp = &obj->package.elements[HWMON_PACK_UNK1];
368 if (tmp->type != ACPI_TYPE_INTEGER) {
369 dev_warn(dev, "Invalid type (unk1): %d\n", tmp->type);
370 return -EINVAL;
371 }
372
373 tmp = &obj->package.elements[HWMON_PACK_UNK2];
374 if (tmp->type != ACPI_TYPE_INTEGER) {
375 dev_warn(dev, "Invalid type (unk2): %d\n", tmp->type);
376 return -EINVAL;
377 }
378 #endif
379
380 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
381 if (tmp->type != ACPI_TYPE_INTEGER) {
382 dev_warn(dev, "Invalid type (limit1): %d\n", tmp->type);
383 return -EINVAL;
384 }
385
386 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
387 if (tmp->type != ACPI_TYPE_INTEGER) {
388 dev_warn(dev, "Invalid type (limit2): %d\n", tmp->type);
389 return -EINVAL;
390 }
391
392 tmp = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
393 if (tmp->type != ACPI_TYPE_INTEGER) {
394 dev_warn(dev, "Invalid type (enable): %d\n", tmp->type);
395 return -EINVAL;
396 }
397
398 atk_print_sensor(data, obj);
399
400 return 0;
401 }
402
403 #ifdef DEBUG
404 static char const *atk_sensor_type(union acpi_object *flags)
405 {
406 u64 type = flags->integer.value & ATK_TYPE_MASK;
407 char const *what;
408
409 switch (type) {
410 case HWMON_TYPE_VOLT:
411 what = "voltage";
412 break;
413 case HWMON_TYPE_TEMP:
414 what = "temperature";
415 break;
416 case HWMON_TYPE_FAN:
417 what = "fan";
418 break;
419 default:
420 what = "unknown";
421 break;
422 }
423
424 return what;
425 }
426 #endif
427
428 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
429 {
430 #ifdef DEBUG
431 struct device *dev = &data->acpi_dev->dev;
432 union acpi_object *flags;
433 union acpi_object *name;
434 union acpi_object *limit1;
435 union acpi_object *limit2;
436 union acpi_object *enable;
437 char const *what;
438
439 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
440 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
441 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
442 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
443 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
444
445 what = atk_sensor_type(flags);
446
447 dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what,
448 flags->integer.value,
449 name->string.pointer,
450 limit1->integer.value, limit2->integer.value,
451 enable->integer.value ? "enabled" : "disabled");
452 #endif
453 }
454
455 static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
456 {
457 struct atk_data *data = sensor->data;
458 struct device *dev = &data->acpi_dev->dev;
459 struct acpi_object_list params;
460 union acpi_object id;
461 acpi_status status;
462 acpi_handle method;
463
464 switch (sensor->type) {
465 case HWMON_TYPE_VOLT:
466 method = data->rvlt_handle;
467 break;
468 case HWMON_TYPE_TEMP:
469 method = data->rtmp_handle;
470 break;
471 case HWMON_TYPE_FAN:
472 method = data->rfan_handle;
473 break;
474 default:
475 return -EINVAL;
476 }
477
478 id.type = ACPI_TYPE_INTEGER;
479 id.integer.value = sensor->id;
480
481 params.count = 1;
482 params.pointer = &id;
483
484 status = acpi_evaluate_integer(method, NULL, &params, value);
485 if (status != AE_OK) {
486 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
487 acpi_format_exception(status));
488 return -EIO;
489 }
490
491 return 0;
492 }
493
494 static union acpi_object *atk_ggrp(struct atk_data *data, u16 mux)
495 {
496 struct device *dev = &data->acpi_dev->dev;
497 struct acpi_buffer buf;
498 acpi_status ret;
499 struct acpi_object_list params;
500 union acpi_object id;
501 union acpi_object *pack;
502
503 id.type = ACPI_TYPE_INTEGER;
504 id.integer.value = mux;
505 params.count = 1;
506 params.pointer = &id;
507
508 buf.length = ACPI_ALLOCATE_BUFFER;
509 ret = acpi_evaluate_object(data->enumerate_handle, NULL, &params, &buf);
510 if (ret != AE_OK) {
511 dev_err(dev, "GGRP[%#x] ACPI exception: %s\n", mux,
512 acpi_format_exception(ret));
513 return ERR_PTR(-EIO);
514 }
515 pack = buf.pointer;
516 if (pack->type != ACPI_TYPE_PACKAGE) {
517 /* Execution was successful, but the id was not found */
518 ACPI_FREE(pack);
519 return ERR_PTR(-ENOENT);
520 }
521
522 if (pack->package.count < 1) {
523 dev_err(dev, "GGRP[%#x] package is too small\n", mux);
524 ACPI_FREE(pack);
525 return ERR_PTR(-EIO);
526 }
527 return pack;
528 }
529
530 static union acpi_object *atk_gitm(struct atk_data *data, u64 id)
531 {
532 struct device *dev = &data->acpi_dev->dev;
533 struct atk_acpi_input_buf buf;
534 union acpi_object tmp;
535 struct acpi_object_list params;
536 struct acpi_buffer ret;
537 union acpi_object *obj;
538 acpi_status status;
539
540 buf.id = id;
541 buf.param1 = 0;
542 buf.param2 = 0;
543
544 tmp.type = ACPI_TYPE_BUFFER;
545 tmp.buffer.pointer = (u8 *)&buf;
546 tmp.buffer.length = sizeof(buf);
547
548 params.count = 1;
549 params.pointer = (void *)&tmp;
550
551 ret.length = ACPI_ALLOCATE_BUFFER;
552 status = acpi_evaluate_object_typed(data->read_handle, NULL, &params,
553 &ret, ACPI_TYPE_BUFFER);
554 if (status != AE_OK) {
555 dev_warn(dev, "GITM[%#llx] ACPI exception: %s\n", id,
556 acpi_format_exception(status));
557 return ERR_PTR(-EIO);
558 }
559 obj = ret.pointer;
560
561 /* Sanity check */
562 if (obj->buffer.length < 8) {
563 dev_warn(dev, "Unexpected ASBF length: %u\n",
564 obj->buffer.length);
565 ACPI_FREE(obj);
566 return ERR_PTR(-EIO);
567 }
568 return obj;
569 }
570
571 static union acpi_object *atk_sitm(struct atk_data *data,
572 struct atk_acpi_input_buf *buf)
573 {
574 struct device *dev = &data->acpi_dev->dev;
575 struct acpi_object_list params;
576 union acpi_object tmp;
577 struct acpi_buffer ret;
578 union acpi_object *obj;
579 acpi_status status;
580
581 tmp.type = ACPI_TYPE_BUFFER;
582 tmp.buffer.pointer = (u8 *)buf;
583 tmp.buffer.length = sizeof(*buf);
584
585 params.count = 1;
586 params.pointer = &tmp;
587
588 ret.length = ACPI_ALLOCATE_BUFFER;
589 status = acpi_evaluate_object_typed(data->write_handle, NULL, &params,
590 &ret, ACPI_TYPE_BUFFER);
591 if (status != AE_OK) {
592 dev_warn(dev, "SITM[%#x] ACPI exception: %s\n", buf->id,
593 acpi_format_exception(status));
594 return ERR_PTR(-EIO);
595 }
596 obj = ret.pointer;
597
598 /* Sanity check */
599 if (obj->buffer.length < 8) {
600 dev_warn(dev, "Unexpected ASBF length: %u\n",
601 obj->buffer.length);
602 ACPI_FREE(obj);
603 return ERR_PTR(-EIO);
604 }
605 return obj;
606 }
607
608 static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
609 {
610 struct atk_data *data = sensor->data;
611 struct device *dev = &data->acpi_dev->dev;
612 union acpi_object *obj;
613 struct atk_acpi_ret_buffer *buf;
614 int err = 0;
615
616 obj = atk_gitm(data, sensor->id);
617 if (IS_ERR(obj))
618 return PTR_ERR(obj);
619
620 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
621 if (buf->flags == 0) {
622 /*
623 * The reading is not valid, possible causes:
624 * - sensor failure
625 * - enumeration was FUBAR (and we didn't notice)
626 */
627 dev_warn(dev, "Read failed, sensor = %#llx\n", sensor->id);
628 err = -EIO;
629 goto out;
630 }
631
632 *value = buf->value;
633 out:
634 ACPI_FREE(obj);
635 return err;
636 }
637
638 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
639 {
640 int err;
641
642 if (!sensor->is_valid ||
643 time_after(jiffies, sensor->last_updated + CACHE_TIME)) {
644 if (sensor->data->old_interface)
645 err = atk_read_value_old(sensor, value);
646 else
647 err = atk_read_value_new(sensor, value);
648
649 sensor->is_valid = true;
650 sensor->last_updated = jiffies;
651 sensor->cached_value = *value;
652 } else {
653 *value = sensor->cached_value;
654 err = 0;
655 }
656
657 return err;
658 }
659
660 #ifdef CONFIG_DEBUG_FS
661 static int atk_debugfs_gitm_get(void *p, u64 *val)
662 {
663 struct atk_data *data = p;
664 union acpi_object *ret;
665 struct atk_acpi_ret_buffer *buf;
666 int err = 0;
667
668 if (!data->read_handle)
669 return -ENODEV;
670
671 if (!data->debugfs.id)
672 return -EINVAL;
673
674 ret = atk_gitm(data, data->debugfs.id);
675 if (IS_ERR(ret))
676 return PTR_ERR(ret);
677
678 buf = (struct atk_acpi_ret_buffer *)ret->buffer.pointer;
679 if (buf->flags)
680 *val = buf->value;
681 else
682 err = -EIO;
683
684 ACPI_FREE(ret);
685 return err;
686 }
687
688 DEFINE_SIMPLE_ATTRIBUTE(atk_debugfs_gitm,
689 atk_debugfs_gitm_get,
690 NULL,
691 "0x%08llx\n");
692
693 static int atk_acpi_print(char *buf, size_t sz, union acpi_object *obj)
694 {
695 int ret = 0;
696
697 switch (obj->type) {
698 case ACPI_TYPE_INTEGER:
699 ret = snprintf(buf, sz, "0x%08llx\n", obj->integer.value);
700 break;
701 case ACPI_TYPE_STRING:
702 ret = snprintf(buf, sz, "%s\n", obj->string.pointer);
703 break;
704 }
705
706 return ret;
707 }
708
709 static void atk_pack_print(char *buf, size_t sz, union acpi_object *pack)
710 {
711 int ret;
712 int i;
713
714 for (i = 0; i < pack->package.count; i++) {
715 union acpi_object *obj = &pack->package.elements[i];
716
717 ret = atk_acpi_print(buf, sz, obj);
718 if (ret >= sz)
719 break;
720 buf += ret;
721 sz -= ret;
722 }
723 }
724
725 static int atk_debugfs_ggrp_open(struct inode *inode, struct file *file)
726 {
727 struct atk_data *data = inode->i_private;
728 char *buf = NULL;
729 union acpi_object *ret;
730 u8 cls;
731 int i;
732
733 if (!data->enumerate_handle)
734 return -ENODEV;
735 if (!data->debugfs.id)
736 return -EINVAL;
737
738 cls = (data->debugfs.id & 0xff000000) >> 24;
739 ret = atk_ggrp(data, cls);
740 if (IS_ERR(ret))
741 return PTR_ERR(ret);
742
743 for (i = 0; i < ret->package.count; i++) {
744 union acpi_object *pack = &ret->package.elements[i];
745 union acpi_object *id;
746
747 if (pack->type != ACPI_TYPE_PACKAGE)
748 continue;
749 if (!pack->package.count)
750 continue;
751 id = &pack->package.elements[0];
752 if (id->integer.value == data->debugfs.id) {
753 /* Print the package */
754 buf = kzalloc(512, GFP_KERNEL);
755 if (!buf) {
756 ACPI_FREE(ret);
757 return -ENOMEM;
758 }
759 atk_pack_print(buf, 512, pack);
760 break;
761 }
762 }
763 ACPI_FREE(ret);
764
765 if (!buf)
766 return -EINVAL;
767
768 file->private_data = buf;
769
770 return nonseekable_open(inode, file);
771 }
772
773 static ssize_t atk_debugfs_ggrp_read(struct file *file, char __user *buf,
774 size_t count, loff_t *pos)
775 {
776 char *str = file->private_data;
777 size_t len = strlen(str);
778
779 return simple_read_from_buffer(buf, count, pos, str, len);
780 }
781
782 static int atk_debugfs_ggrp_release(struct inode *inode, struct file *file)
783 {
784 kfree(file->private_data);
785 return 0;
786 }
787
788 static const struct file_operations atk_debugfs_ggrp_fops = {
789 .read = atk_debugfs_ggrp_read,
790 .open = atk_debugfs_ggrp_open,
791 .release = atk_debugfs_ggrp_release,
792 .llseek = no_llseek,
793 };
794
795 static void atk_debugfs_init(struct atk_data *data)
796 {
797 struct dentry *d;
798 struct dentry *f;
799
800 data->debugfs.id = 0;
801
802 d = debugfs_create_dir("asus_atk0110", NULL);
803 if (!d || IS_ERR(d))
804 return;
805
806 f = debugfs_create_x32("id", S_IRUSR | S_IWUSR, d, &data->debugfs.id);
807 if (!f || IS_ERR(f))
808 goto cleanup;
809
810 f = debugfs_create_file("gitm", S_IRUSR, d, data,
811 &atk_debugfs_gitm);
812 if (!f || IS_ERR(f))
813 goto cleanup;
814
815 f = debugfs_create_file("ggrp", S_IRUSR, d, data,
816 &atk_debugfs_ggrp_fops);
817 if (!f || IS_ERR(f))
818 goto cleanup;
819
820 data->debugfs.root = d;
821
822 return;
823 cleanup:
824 debugfs_remove_recursive(d);
825 }
826
827 static void atk_debugfs_cleanup(struct atk_data *data)
828 {
829 debugfs_remove_recursive(data->debugfs.root);
830 }
831
832 #else /* CONFIG_DEBUG_FS */
833
834 static void atk_debugfs_init(struct atk_data *data)
835 {
836 }
837
838 static void atk_debugfs_cleanup(struct atk_data *data)
839 {
840 }
841 #endif
842
843 static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
844 {
845 struct device *dev = &data->acpi_dev->dev;
846 union acpi_object *flags;
847 union acpi_object *name;
848 union acpi_object *limit1;
849 union acpi_object *limit2;
850 union acpi_object *enable;
851 struct atk_sensor_data *sensor;
852 char const *base_name;
853 char const *limit1_name;
854 char const *limit2_name;
855 u64 type;
856 int err;
857 int *num;
858 int start;
859
860 if (obj->type != ACPI_TYPE_PACKAGE) {
861 /* wft is this? */
862 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
863 obj->type);
864 return -EINVAL;
865 }
866
867 err = validate_hwmon_pack(data, obj);
868 if (err)
869 return err;
870
871 /* Ok, we have a valid hwmon package */
872 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
873 & ATK_TYPE_MASK;
874
875 switch (type) {
876 case HWMON_TYPE_VOLT:
877 base_name = "in";
878 limit1_name = "min";
879 limit2_name = "max";
880 num = &data->voltage_count;
881 start = 0;
882 break;
883 case HWMON_TYPE_TEMP:
884 base_name = "temp";
885 limit1_name = "max";
886 limit2_name = "crit";
887 num = &data->temperature_count;
888 start = 1;
889 break;
890 case HWMON_TYPE_FAN:
891 base_name = "fan";
892 limit1_name = "min";
893 limit2_name = "max";
894 num = &data->fan_count;
895 start = 1;
896 break;
897 default:
898 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
899 return -EINVAL;
900 }
901
902 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
903 if (!enable->integer.value)
904 /* sensor is disabled */
905 return 0;
906
907 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
908 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
909 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
910 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
911
912 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
913 if (!sensor)
914 return -ENOMEM;
915
916 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
917 if (!sensor->acpi_name) {
918 err = -ENOMEM;
919 goto out;
920 }
921
922 INIT_LIST_HEAD(&sensor->list);
923 sensor->type = type;
924 sensor->data = data;
925 sensor->id = flags->integer.value;
926 sensor->limit1 = limit1->integer.value;
927 if (data->old_interface)
928 sensor->limit2 = limit2->integer.value;
929 else
930 /* The upper limit is expressed as delta from lower limit */
931 sensor->limit2 = sensor->limit1 + limit2->integer.value;
932
933 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
934 "%s%d_input", base_name, start + *num);
935 atk_init_attribute(&sensor->input_attr,
936 sensor->input_attr_name,
937 atk_input_show);
938
939 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
940 "%s%d_label", base_name, start + *num);
941 atk_init_attribute(&sensor->label_attr,
942 sensor->label_attr_name,
943 atk_label_show);
944
945 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
946 "%s%d_%s", base_name, start + *num, limit1_name);
947 atk_init_attribute(&sensor->limit1_attr,
948 sensor->limit1_attr_name,
949 atk_limit1_show);
950
951 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
952 "%s%d_%s", base_name, start + *num, limit2_name);
953 atk_init_attribute(&sensor->limit2_attr,
954 sensor->limit2_attr_name,
955 atk_limit2_show);
956
957 list_add(&sensor->list, &data->sensor_list);
958 (*num)++;
959
960 return 1;
961 out:
962 kfree(sensor);
963 return err;
964 }
965
966 static int atk_enumerate_old_hwmon(struct atk_data *data)
967 {
968 struct device *dev = &data->acpi_dev->dev;
969 struct acpi_buffer buf;
970 union acpi_object *pack;
971 acpi_status status;
972 int i, ret;
973 int count = 0;
974
975 /* Voltages */
976 buf.length = ACPI_ALLOCATE_BUFFER;
977 status = acpi_evaluate_object_typed(data->atk_handle,
978 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
979 if (status != AE_OK) {
980 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
981 acpi_format_exception(status));
982
983 return -ENODEV;
984 }
985
986 pack = buf.pointer;
987 for (i = 1; i < pack->package.count; i++) {
988 union acpi_object *obj = &pack->package.elements[i];
989
990 ret = atk_add_sensor(data, obj);
991 if (ret > 0)
992 count++;
993 }
994 ACPI_FREE(buf.pointer);
995
996 /* Temperatures */
997 buf.length = ACPI_ALLOCATE_BUFFER;
998 status = acpi_evaluate_object_typed(data->atk_handle,
999 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
1000 if (status != AE_OK) {
1001 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
1002 acpi_format_exception(status));
1003
1004 ret = -ENODEV;
1005 goto cleanup;
1006 }
1007
1008 pack = buf.pointer;
1009 for (i = 1; i < pack->package.count; i++) {
1010 union acpi_object *obj = &pack->package.elements[i];
1011
1012 ret = atk_add_sensor(data, obj);
1013 if (ret > 0)
1014 count++;
1015 }
1016 ACPI_FREE(buf.pointer);
1017
1018 /* Fans */
1019 buf.length = ACPI_ALLOCATE_BUFFER;
1020 status = acpi_evaluate_object_typed(data->atk_handle,
1021 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
1022 if (status != AE_OK) {
1023 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
1024 acpi_format_exception(status));
1025
1026 ret = -ENODEV;
1027 goto cleanup;
1028 }
1029
1030 pack = buf.pointer;
1031 for (i = 1; i < pack->package.count; i++) {
1032 union acpi_object *obj = &pack->package.elements[i];
1033
1034 ret = atk_add_sensor(data, obj);
1035 if (ret > 0)
1036 count++;
1037 }
1038 ACPI_FREE(buf.pointer);
1039
1040 return count;
1041 cleanup:
1042 atk_free_sensors(data);
1043 return ret;
1044 }
1045
1046 static int atk_ec_present(struct atk_data *data)
1047 {
1048 struct device *dev = &data->acpi_dev->dev;
1049 union acpi_object *pack;
1050 union acpi_object *ec;
1051 int ret;
1052 int i;
1053
1054 pack = atk_ggrp(data, ATK_MUX_MGMT);
1055 if (IS_ERR(pack)) {
1056 if (PTR_ERR(pack) == -ENOENT) {
1057 /* The MGMT class does not exists - that's ok */
1058 dev_dbg(dev, "Class %#llx not found\n", ATK_MUX_MGMT);
1059 return 0;
1060 }
1061 return PTR_ERR(pack);
1062 }
1063
1064 /* Search the EC */
1065 ec = NULL;
1066 for (i = 0; i < pack->package.count; i++) {
1067 union acpi_object *obj = &pack->package.elements[i];
1068 union acpi_object *id;
1069
1070 if (obj->type != ACPI_TYPE_PACKAGE)
1071 continue;
1072
1073 id = &obj->package.elements[0];
1074 if (id->type != ACPI_TYPE_INTEGER)
1075 continue;
1076
1077 if (id->integer.value == ATK_EC_ID) {
1078 ec = obj;
1079 break;
1080 }
1081 }
1082
1083 ret = (ec != NULL);
1084 if (!ret)
1085 /* The system has no EC */
1086 dev_dbg(dev, "EC not found\n");
1087
1088 ACPI_FREE(pack);
1089 return ret;
1090 }
1091
1092 static int atk_ec_enabled(struct atk_data *data)
1093 {
1094 struct device *dev = &data->acpi_dev->dev;
1095 union acpi_object *obj;
1096 struct atk_acpi_ret_buffer *buf;
1097 int err;
1098
1099 obj = atk_gitm(data, ATK_EC_ID);
1100 if (IS_ERR(obj)) {
1101 dev_err(dev, "Unable to query EC status\n");
1102 return PTR_ERR(obj);
1103 }
1104 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1105
1106 if (buf->flags == 0) {
1107 dev_err(dev, "Unable to query EC status\n");
1108 err = -EIO;
1109 } else {
1110 err = (buf->value != 0);
1111 dev_dbg(dev, "EC is %sabled\n",
1112 err ? "en" : "dis");
1113 }
1114
1115 ACPI_FREE(obj);
1116 return err;
1117 }
1118
1119 static int atk_ec_ctl(struct atk_data *data, int enable)
1120 {
1121 struct device *dev = &data->acpi_dev->dev;
1122 union acpi_object *obj;
1123 struct atk_acpi_input_buf sitm;
1124 struct atk_acpi_ret_buffer *ec_ret;
1125 int err = 0;
1126
1127 sitm.id = ATK_EC_ID;
1128 sitm.param1 = enable;
1129 sitm.param2 = 0;
1130
1131 obj = atk_sitm(data, &sitm);
1132 if (IS_ERR(obj)) {
1133 dev_err(dev, "Failed to %sable the EC\n",
1134 enable ? "en" : "dis");
1135 return PTR_ERR(obj);
1136 }
1137 ec_ret = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1138 if (ec_ret->flags == 0) {
1139 dev_err(dev, "Failed to %sable the EC\n",
1140 enable ? "en" : "dis");
1141 err = -EIO;
1142 } else {
1143 dev_info(dev, "EC %sabled\n",
1144 enable ? "en" : "dis");
1145 }
1146
1147 ACPI_FREE(obj);
1148 return err;
1149 }
1150
1151 static int atk_enumerate_new_hwmon(struct atk_data *data)
1152 {
1153 struct device *dev = &data->acpi_dev->dev;
1154 union acpi_object *pack;
1155 int err;
1156 int i;
1157
1158 err = atk_ec_present(data);
1159 if (err < 0)
1160 return err;
1161 if (err) {
1162 err = atk_ec_enabled(data);
1163 if (err < 0)
1164 return err;
1165 /* If the EC was disabled we will disable it again on unload */
1166 data->disable_ec = err;
1167
1168 err = atk_ec_ctl(data, 1);
1169 if (err) {
1170 data->disable_ec = false;
1171 return err;
1172 }
1173 }
1174
1175 dev_dbg(dev, "Enumerating hwmon sensors\n");
1176
1177 pack = atk_ggrp(data, ATK_MUX_HWMON);
1178 if (IS_ERR(pack))
1179 return PTR_ERR(pack);
1180
1181 for (i = 0; i < pack->package.count; i++) {
1182 union acpi_object *obj = &pack->package.elements[i];
1183
1184 atk_add_sensor(data, obj);
1185 }
1186
1187 err = data->voltage_count + data->temperature_count + data->fan_count;
1188
1189 ACPI_FREE(pack);
1190 return err;
1191 }
1192
1193 static int atk_create_files(struct atk_data *data)
1194 {
1195 struct atk_sensor_data *s;
1196 int err;
1197
1198 list_for_each_entry(s, &data->sensor_list, list) {
1199 err = device_create_file(data->hwmon_dev, &s->input_attr);
1200 if (err)
1201 return err;
1202 err = device_create_file(data->hwmon_dev, &s->label_attr);
1203 if (err)
1204 return err;
1205 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
1206 if (err)
1207 return err;
1208 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
1209 if (err)
1210 return err;
1211 }
1212
1213 err = device_create_file(data->hwmon_dev, &atk_name_attr);
1214
1215 return err;
1216 }
1217
1218 static void atk_remove_files(struct atk_data *data)
1219 {
1220 struct atk_sensor_data *s;
1221
1222 list_for_each_entry(s, &data->sensor_list, list) {
1223 device_remove_file(data->hwmon_dev, &s->input_attr);
1224 device_remove_file(data->hwmon_dev, &s->label_attr);
1225 device_remove_file(data->hwmon_dev, &s->limit1_attr);
1226 device_remove_file(data->hwmon_dev, &s->limit2_attr);
1227 }
1228 device_remove_file(data->hwmon_dev, &atk_name_attr);
1229 }
1230
1231 static void atk_free_sensors(struct atk_data *data)
1232 {
1233 struct list_head *head = &data->sensor_list;
1234 struct atk_sensor_data *s, *tmp;
1235
1236 list_for_each_entry_safe(s, tmp, head, list) {
1237 kfree(s->acpi_name);
1238 kfree(s);
1239 }
1240 }
1241
1242 static int atk_register_hwmon(struct atk_data *data)
1243 {
1244 struct device *dev = &data->acpi_dev->dev;
1245 int err;
1246
1247 dev_dbg(dev, "registering hwmon device\n");
1248 data->hwmon_dev = hwmon_device_register(dev);
1249 if (IS_ERR(data->hwmon_dev))
1250 return PTR_ERR(data->hwmon_dev);
1251
1252 dev_dbg(dev, "populating sysfs directory\n");
1253 err = atk_create_files(data);
1254 if (err)
1255 goto remove;
1256
1257 return 0;
1258 remove:
1259 /* Cleanup the registered files */
1260 atk_remove_files(data);
1261 hwmon_device_unregister(data->hwmon_dev);
1262 return err;
1263 }
1264
1265 static int atk_probe_if(struct atk_data *data)
1266 {
1267 struct device *dev = &data->acpi_dev->dev;
1268 acpi_handle ret;
1269 acpi_status status;
1270 int err = 0;
1271
1272 /* RTMP: read temperature */
1273 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
1274 if (ACPI_SUCCESS(status))
1275 data->rtmp_handle = ret;
1276 else
1277 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
1278 acpi_format_exception(status));
1279
1280 /* RVLT: read voltage */
1281 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
1282 if (ACPI_SUCCESS(status))
1283 data->rvlt_handle = ret;
1284 else
1285 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
1286 acpi_format_exception(status));
1287
1288 /* RFAN: read fan status */
1289 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
1290 if (ACPI_SUCCESS(status))
1291 data->rfan_handle = ret;
1292 else
1293 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
1294 acpi_format_exception(status));
1295
1296 /* Enumeration */
1297 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
1298 if (ACPI_SUCCESS(status))
1299 data->enumerate_handle = ret;
1300 else
1301 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
1302 acpi_format_exception(status));
1303
1304 /* De-multiplexer (read) */
1305 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
1306 if (ACPI_SUCCESS(status))
1307 data->read_handle = ret;
1308 else
1309 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
1310 acpi_format_exception(status));
1311
1312 /* De-multiplexer (write) */
1313 status = acpi_get_handle(data->atk_handle, METHOD_WRITE, &ret);
1314 if (ACPI_SUCCESS(status))
1315 data->write_handle = ret;
1316 else
1317 dev_dbg(dev, "method " METHOD_WRITE " not found: %s\n",
1318 acpi_format_exception(status));
1319
1320 /*
1321 * Check for hwmon methods: first check "old" style methods; note that
1322 * both may be present: in this case we stick to the old interface;
1323 * analysis of multiple DSDTs indicates that when both interfaces
1324 * are present the new one (GGRP/GITM) is not functional.
1325 */
1326 if (new_if)
1327 dev_info(dev, "Overriding interface detection\n");
1328 if (data->rtmp_handle &&
1329 data->rvlt_handle && data->rfan_handle && !new_if)
1330 data->old_interface = true;
1331 else if (data->enumerate_handle && data->read_handle &&
1332 data->write_handle)
1333 data->old_interface = false;
1334 else
1335 err = -ENODEV;
1336
1337 return err;
1338 }
1339
1340 static int atk_add(struct acpi_device *device)
1341 {
1342 acpi_status ret;
1343 int err;
1344 struct acpi_buffer buf;
1345 union acpi_object *obj;
1346 struct atk_data *data;
1347
1348 dev_dbg(&device->dev, "adding...\n");
1349
1350 data = kzalloc(sizeof(*data), GFP_KERNEL);
1351 if (!data)
1352 return -ENOMEM;
1353
1354 data->acpi_dev = device;
1355 data->atk_handle = device->handle;
1356 INIT_LIST_HEAD(&data->sensor_list);
1357 data->disable_ec = false;
1358
1359 buf.length = ACPI_ALLOCATE_BUFFER;
1360 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
1361 &buf, ACPI_TYPE_PACKAGE);
1362 if (ret != AE_OK) {
1363 dev_dbg(&device->dev, "atk: method MBIF not found\n");
1364 } else {
1365 obj = buf.pointer;
1366 if (obj->package.count >= 2) {
1367 union acpi_object *id = &obj->package.elements[1];
1368 if (id->type == ACPI_TYPE_STRING)
1369 dev_dbg(&device->dev, "board ID = %s\n",
1370 id->string.pointer);
1371 }
1372 ACPI_FREE(buf.pointer);
1373 }
1374
1375 err = atk_probe_if(data);
1376 if (err) {
1377 dev_err(&device->dev, "No usable hwmon interface detected\n");
1378 goto out;
1379 }
1380
1381 if (data->old_interface) {
1382 dev_dbg(&device->dev, "Using old hwmon interface\n");
1383 err = atk_enumerate_old_hwmon(data);
1384 } else {
1385 dev_dbg(&device->dev, "Using new hwmon interface\n");
1386 err = atk_enumerate_new_hwmon(data);
1387 }
1388 if (err < 0)
1389 goto out;
1390 if (err == 0) {
1391 dev_info(&device->dev,
1392 "No usable sensor detected, bailing out\n");
1393 err = -ENODEV;
1394 goto out;
1395 }
1396
1397 err = atk_register_hwmon(data);
1398 if (err)
1399 goto cleanup;
1400
1401 atk_debugfs_init(data);
1402
1403 device->driver_data = data;
1404 return 0;
1405 cleanup:
1406 atk_free_sensors(data);
1407 out:
1408 if (data->disable_ec)
1409 atk_ec_ctl(data, 0);
1410 kfree(data);
1411 return err;
1412 }
1413
1414 static int atk_remove(struct acpi_device *device)
1415 {
1416 struct atk_data *data = device->driver_data;
1417 dev_dbg(&device->dev, "removing...\n");
1418
1419 device->driver_data = NULL;
1420
1421 atk_debugfs_cleanup(data);
1422
1423 atk_remove_files(data);
1424 atk_free_sensors(data);
1425 hwmon_device_unregister(data->hwmon_dev);
1426
1427 if (data->disable_ec) {
1428 if (atk_ec_ctl(data, 0))
1429 dev_err(&device->dev, "Failed to disable EC\n");
1430 }
1431
1432 kfree(data);
1433
1434 return 0;
1435 }
1436
1437 static int __init atk0110_init(void)
1438 {
1439 int ret;
1440
1441 /* Make sure it's safe to access the device through ACPI */
1442 if (!acpi_resources_are_enforced()) {
1443 pr_err("Resources not safely usable due to acpi_enforce_resources kernel parameter\n");
1444 return -EBUSY;
1445 }
1446
1447 if (dmi_check_system(atk_force_new_if))
1448 new_if = true;
1449
1450 ret = acpi_bus_register_driver(&atk_driver);
1451 if (ret)
1452 pr_info("acpi_bus_register_driver failed: %d\n", ret);
1453
1454 return ret;
1455 }
1456
1457 static void __exit atk0110_exit(void)
1458 {
1459 acpi_bus_unregister_driver(&atk_driver);
1460 }
1461
1462 module_init(atk0110_init);
1463 module_exit(atk0110_exit);
1464
1465 MODULE_LICENSE("GPL");
Linux with added FPC-III support