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