?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / hwmon / asus_atk0110.c
blob975c43d446f8593d0e701efeaf8da133717cff74
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 if (err)
650 return err;
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);
966 return err;
967 }
968
969 static int atk_enumerate_old_hwmon(struct atk_data *data)
970 {
971 struct device *dev = &data->acpi_dev->dev;
972 struct acpi_buffer buf;
973 union acpi_object *pack;
974 acpi_status status;
975 int i, ret;
976 int count = 0;
977
978 /* Voltages */
979 buf.length = ACPI_ALLOCATE_BUFFER;
980 status = acpi_evaluate_object_typed(data->atk_handle,
981 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
982 if (status != AE_OK) {
983 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
984 acpi_format_exception(status));
985
986 return -ENODEV;
987 }
988
989 pack = buf.pointer;
990 for (i = 1; i < pack->package.count; i++) {
991 union acpi_object *obj = &pack->package.elements[i];
992
993 ret = atk_add_sensor(data, obj);
994 if (ret > 0)
995 count++;
996 }
997 ACPI_FREE(buf.pointer);
998
999 /* Temperatures */
1000 buf.length = ACPI_ALLOCATE_BUFFER;
1001 status = acpi_evaluate_object_typed(data->atk_handle,
1002 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
1003 if (status != AE_OK) {
1004 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
1005 acpi_format_exception(status));
1006
1007 ret = -ENODEV;
1008 goto cleanup;
1009 }
1010
1011 pack = buf.pointer;
1012 for (i = 1; i < pack->package.count; i++) {
1013 union acpi_object *obj = &pack->package.elements[i];
1014
1015 ret = atk_add_sensor(data, obj);
1016 if (ret > 0)
1017 count++;
1018 }
1019 ACPI_FREE(buf.pointer);
1020
1021 /* Fans */
1022 buf.length = ACPI_ALLOCATE_BUFFER;
1023 status = acpi_evaluate_object_typed(data->atk_handle,
1024 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
1025 if (status != AE_OK) {
1026 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
1027 acpi_format_exception(status));
1028
1029 ret = -ENODEV;
1030 goto cleanup;
1031 }
1032
1033 pack = buf.pointer;
1034 for (i = 1; i < pack->package.count; i++) {
1035 union acpi_object *obj = &pack->package.elements[i];
1036
1037 ret = atk_add_sensor(data, obj);
1038 if (ret > 0)
1039 count++;
1040 }
1041 ACPI_FREE(buf.pointer);
1042
1043 return count;
1044 cleanup:
1045 atk_free_sensors(data);
1046 return ret;
1047 }
1048
1049 static int atk_ec_present(struct atk_data *data)
1050 {
1051 struct device *dev = &data->acpi_dev->dev;
1052 union acpi_object *pack;
1053 union acpi_object *ec;
1054 int ret;
1055 int i;
1056
1057 pack = atk_ggrp(data, ATK_MUX_MGMT);
1058 if (IS_ERR(pack)) {
1059 if (PTR_ERR(pack) == -ENOENT) {
1060 /* The MGMT class does not exists - that's ok */
1061 dev_dbg(dev, "Class %#llx not found\n", ATK_MUX_MGMT);
1062 return 0;
1063 }
1064 return PTR_ERR(pack);
1065 }
1066
1067 /* Search the EC */
1068 ec = NULL;
1069 for (i = 0; i < pack->package.count; i++) {
1070 union acpi_object *obj = &pack->package.elements[i];
1071 union acpi_object *id;
1072
1073 if (obj->type != ACPI_TYPE_PACKAGE)
1074 continue;
1075
1076 id = &obj->package.elements[0];
1077 if (id->type != ACPI_TYPE_INTEGER)
1078 continue;
1079
1080 if (id->integer.value == ATK_EC_ID) {
1081 ec = obj;
1082 break;
1083 }
1084 }
1085
1086 ret = (ec != NULL);
1087 if (!ret)
1088 /* The system has no EC */
1089 dev_dbg(dev, "EC not found\n");
1090
1091 ACPI_FREE(pack);
1092 return ret;
1093 }
1094
1095 static int atk_ec_enabled(struct atk_data *data)
1096 {
1097 struct device *dev = &data->acpi_dev->dev;
1098 union acpi_object *obj;
1099 struct atk_acpi_ret_buffer *buf;
1100 int err;
1101
1102 obj = atk_gitm(data, ATK_EC_ID);
1103 if (IS_ERR(obj)) {
1104 dev_err(dev, "Unable to query EC status\n");
1105 return PTR_ERR(obj);
1106 }
1107 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1108
1109 if (buf->flags == 0) {
1110 dev_err(dev, "Unable to query EC status\n");
1111 err = -EIO;
1112 } else {
1113 err = (buf->value != 0);
1114 dev_dbg(dev, "EC is %sabled\n",
1115 err ? "en" : "dis");
1116 }
1117
1118 ACPI_FREE(obj);
1119 return err;
1120 }
1121
1122 static int atk_ec_ctl(struct atk_data *data, int enable)
1123 {
1124 struct device *dev = &data->acpi_dev->dev;
1125 union acpi_object *obj;
1126 struct atk_acpi_input_buf sitm;
1127 struct atk_acpi_ret_buffer *ec_ret;
1128 int err = 0;
1129
1130 sitm.id = ATK_EC_ID;
1131 sitm.param1 = enable;
1132 sitm.param2 = 0;
1133
1134 obj = atk_sitm(data, &sitm);
1135 if (IS_ERR(obj)) {
1136 dev_err(dev, "Failed to %sable the EC\n",
1137 enable ? "en" : "dis");
1138 return PTR_ERR(obj);
1139 }
1140 ec_ret = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1141 if (ec_ret->flags == 0) {
1142 dev_err(dev, "Failed to %sable the EC\n",
1143 enable ? "en" : "dis");
1144 err = -EIO;
1145 } else {
1146 dev_info(dev, "EC %sabled\n",
1147 enable ? "en" : "dis");
1148 }
1149
1150 ACPI_FREE(obj);
1151 return err;
1152 }
1153
1154 static int atk_enumerate_new_hwmon(struct atk_data *data)
1155 {
1156 struct device *dev = &data->acpi_dev->dev;
1157 union acpi_object *pack;
1158 int err;
1159 int i;
1160
1161 err = atk_ec_present(data);
1162 if (err < 0)
1163 return err;
1164 if (err) {
1165 err = atk_ec_enabled(data);
1166 if (err < 0)
1167 return err;
1168 /* If the EC was disabled we will disable it again on unload */
1169 data->disable_ec = err;
1170
1171 err = atk_ec_ctl(data, 1);
1172 if (err) {
1173 data->disable_ec = false;
1174 return err;
1175 }
1176 }
1177
1178 dev_dbg(dev, "Enumerating hwmon sensors\n");
1179
1180 pack = atk_ggrp(data, ATK_MUX_HWMON);
1181 if (IS_ERR(pack))
1182 return PTR_ERR(pack);
1183
1184 for (i = 0; i < pack->package.count; i++) {
1185 union acpi_object *obj = &pack->package.elements[i];
1186
1187 atk_add_sensor(data, obj);
1188 }
1189
1190 err = data->voltage_count + data->temperature_count + data->fan_count;
1191
1192 ACPI_FREE(pack);
1193 return err;
1194 }
1195
1196 static int atk_create_files(struct atk_data *data)
1197 {
1198 struct atk_sensor_data *s;
1199 int err;
1200
1201 list_for_each_entry(s, &data->sensor_list, list) {
1202 err = device_create_file(data->hwmon_dev, &s->input_attr);
1203 if (err)
1204 return err;
1205 err = device_create_file(data->hwmon_dev, &s->label_attr);
1206 if (err)
1207 return err;
1208 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
1209 if (err)
1210 return err;
1211 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
1212 if (err)
1213 return err;
1214 }
1215
1216 err = device_create_file(data->hwmon_dev, &atk_name_attr);
1217
1218 return err;
1219 }
1220
1221 static void atk_remove_files(struct atk_data *data)
1222 {
1223 struct atk_sensor_data *s;
1224
1225 list_for_each_entry(s, &data->sensor_list, list) {
1226 device_remove_file(data->hwmon_dev, &s->input_attr);
1227 device_remove_file(data->hwmon_dev, &s->label_attr);
1228 device_remove_file(data->hwmon_dev, &s->limit1_attr);
1229 device_remove_file(data->hwmon_dev, &s->limit2_attr);
1230 }
1231 device_remove_file(data->hwmon_dev, &atk_name_attr);
1232 }
1233
1234 static void atk_free_sensors(struct atk_data *data)
1235 {
1236 struct list_head *head = &data->sensor_list;
1237 struct atk_sensor_data *s, *tmp;
1238
1239 list_for_each_entry_safe(s, tmp, head, list) {
1240 kfree(s->acpi_name);
1241 kfree(s);
1242 }
1243 }
1244
1245 static int atk_register_hwmon(struct atk_data *data)
1246 {
1247 struct device *dev = &data->acpi_dev->dev;
1248 int err;
1249
1250 dev_dbg(dev, "registering hwmon device\n");
1251 data->hwmon_dev = hwmon_device_register(dev);
1252 if (IS_ERR(data->hwmon_dev))
1253 return PTR_ERR(data->hwmon_dev);
1254
1255 dev_dbg(dev, "populating sysfs directory\n");
1256 err = atk_create_files(data);
1257 if (err)
1258 goto remove;
1259
1260 return 0;
1261 remove:
1262 /* Cleanup the registered files */
1263 atk_remove_files(data);
1264 hwmon_device_unregister(data->hwmon_dev);
1265 return err;
1266 }
1267
1268 static int atk_probe_if(struct atk_data *data)
1269 {
1270 struct device *dev = &data->acpi_dev->dev;
1271 acpi_handle ret;
1272 acpi_status status;
1273 int err = 0;
1274
1275 /* RTMP: read temperature */
1276 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
1277 if (ACPI_SUCCESS(status))
1278 data->rtmp_handle = ret;
1279 else
1280 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
1281 acpi_format_exception(status));
1282
1283 /* RVLT: read voltage */
1284 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
1285 if (ACPI_SUCCESS(status))
1286 data->rvlt_handle = ret;
1287 else
1288 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
1289 acpi_format_exception(status));
1290
1291 /* RFAN: read fan status */
1292 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
1293 if (ACPI_SUCCESS(status))
1294 data->rfan_handle = ret;
1295 else
1296 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
1297 acpi_format_exception(status));
1298
1299 /* Enumeration */
1300 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
1301 if (ACPI_SUCCESS(status))
1302 data->enumerate_handle = ret;
1303 else
1304 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
1305 acpi_format_exception(status));
1306
1307 /* De-multiplexer (read) */
1308 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
1309 if (ACPI_SUCCESS(status))
1310 data->read_handle = ret;
1311 else
1312 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
1313 acpi_format_exception(status));
1314
1315 /* De-multiplexer (write) */
1316 status = acpi_get_handle(data->atk_handle, METHOD_WRITE, &ret);
1317 if (ACPI_SUCCESS(status))
1318 data->write_handle = ret;
1319 else
1320 dev_dbg(dev, "method " METHOD_WRITE " not found: %s\n",
1321 acpi_format_exception(status));
1322
1323 /*
1324 * Check for hwmon methods: first check "old" style methods; note that
1325 * both may be present: in this case we stick to the old interface;
1326 * analysis of multiple DSDTs indicates that when both interfaces
1327 * are present the new one (GGRP/GITM) is not functional.
1328 */
1329 if (new_if)
1330 dev_info(dev, "Overriding interface detection\n");
1331 if (data->rtmp_handle &&
1332 data->rvlt_handle && data->rfan_handle && !new_if)
1333 data->old_interface = true;
1334 else if (data->enumerate_handle && data->read_handle &&
1335 data->write_handle)
1336 data->old_interface = false;
1337 else
1338 err = -ENODEV;
1339
1340 return err;
1341 }
1342
1343 static int atk_add(struct acpi_device *device)
1344 {
1345 acpi_status ret;
1346 int err;
1347 struct acpi_buffer buf;
1348 union acpi_object *obj;
1349 struct atk_data *data;
1350
1351 dev_dbg(&device->dev, "adding...\n");
1352
1353 data = kzalloc(sizeof(*data), GFP_KERNEL);
1354 if (!data)
1355 return -ENOMEM;
1356
1357 data->acpi_dev = device;
1358 data->atk_handle = device->handle;
1359 INIT_LIST_HEAD(&data->sensor_list);
1360 data->disable_ec = false;
1361
1362 buf.length = ACPI_ALLOCATE_BUFFER;
1363 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
1364 &buf, ACPI_TYPE_PACKAGE);
1365 if (ret != AE_OK) {
1366 dev_dbg(&device->dev, "atk: method MBIF not found\n");
1367 } else {
1368 obj = buf.pointer;
1369 if (obj->package.count >= 2) {
1370 union acpi_object *id = &obj->package.elements[1];
1371 if (id->type == ACPI_TYPE_STRING)
1372 dev_dbg(&device->dev, "board ID = %s\n",
1373 id->string.pointer);
1374 }
1375 ACPI_FREE(buf.pointer);
1376 }
1377
1378 err = atk_probe_if(data);
1379 if (err) {
1380 dev_err(&device->dev, "No usable hwmon interface detected\n");
1381 goto out;
1382 }
1383
1384 if (data->old_interface) {
1385 dev_dbg(&device->dev, "Using old hwmon interface\n");
1386 err = atk_enumerate_old_hwmon(data);
1387 } else {
1388 dev_dbg(&device->dev, "Using new hwmon interface\n");
1389 err = atk_enumerate_new_hwmon(data);
1390 }
1391 if (err < 0)
1392 goto out;
1393 if (err == 0) {
1394 dev_info(&device->dev,
1395 "No usable sensor detected, bailing out\n");
1396 err = -ENODEV;
1397 goto out;
1398 }
1399
1400 err = atk_register_hwmon(data);
1401 if (err)
1402 goto cleanup;
1403
1404 atk_debugfs_init(data);
1405
1406 device->driver_data = data;
1407 return 0;
1408 cleanup:
1409 atk_free_sensors(data);
1410 out:
1411 if (data->disable_ec)
1412 atk_ec_ctl(data, 0);
1413 kfree(data);
1414 return err;
1415 }
1416
1417 static int atk_remove(struct acpi_device *device)
1418 {
1419 struct atk_data *data = device->driver_data;
1420 dev_dbg(&device->dev, "removing...\n");
1421
1422 device->driver_data = NULL;
1423
1424 atk_debugfs_cleanup(data);
1425
1426 atk_remove_files(data);
1427 atk_free_sensors(data);
1428 hwmon_device_unregister(data->hwmon_dev);
1429
1430 if (data->disable_ec) {
1431 if (atk_ec_ctl(data, 0))
1432 dev_err(&device->dev, "Failed to disable EC\n");
1433 }
1434
1435 kfree(data);
1436
1437 return 0;
1438 }
1439
1440 static int __init atk0110_init(void)
1441 {
1442 int ret;
1443
1444 /* Make sure it's safe to access the device through ACPI */
1445 if (!acpi_resources_are_enforced()) {
1446 pr_err("Resources not safely usable due to acpi_enforce_resources kernel parameter\n");
1447 return -EBUSY;
1448 }
1449
1450 if (dmi_check_system(atk_force_new_if))
1451 new_if = true;
1452
1453 ret = acpi_bus_register_driver(&atk_driver);
1454 if (ret)
1455 pr_info("acpi_bus_register_driver failed: %d\n", ret);
1456
1457 return ret;
1458 }
1459
1460 static void __exit atk0110_exit(void)
1461 {
1462 acpi_bus_unregister_driver(&atk_driver);
1463 }
1464
1465 module_init(atk0110_init);
1466 module_exit(atk0110_exit);
1467
1468 MODULE_LICENSE("GPL");
Linux with added FPC-III support