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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / hwmon / asus_atk0110.c
blobff64a39d56def96582571aa4551189cdab3fd062
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2007-2009 Luca Tettamanti <kronos.it@gmail.com>
4 *
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
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
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
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
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
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
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 */
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
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
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
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, &params, 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
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, &params, &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
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, &params,
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
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, &params,
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
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
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
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_DEBUGFS_ATTRIBUTE(atk_debugfs_gitm, atk_debugfs_gitm_get, NULL,
685 "0x%08llx\n");
686
687 static int atk_acpi_print(char *buf, size_t sz, union acpi_object *obj)
688 {
689 int ret = 0;
690
691 switch (obj->type) {
692 case ACPI_TYPE_INTEGER:
693 ret = snprintf(buf, sz, "0x%08llx\n", obj->integer.value);
694 break;
695 case ACPI_TYPE_STRING:
696 ret = snprintf(buf, sz, "%s\n", obj->string.pointer);
697 break;
698 }
699
700 return ret;
701 }
702
703 static void atk_pack_print(char *buf, size_t sz, union acpi_object *pack)
704 {
705 int ret;
706 int i;
707
708 for (i = 0; i < pack->package.count; i++) {
709 union acpi_object *obj = &pack->package.elements[i];
710
711 ret = atk_acpi_print(buf, sz, obj);
712 if (ret >= sz)
713 break;
714 buf += ret;
715 sz -= ret;
716 }
717 }
718
719 static int atk_debugfs_ggrp_open(struct inode *inode, struct file *file)
720 {
721 struct atk_data *data = inode->i_private;
722 char *buf = NULL;
723 union acpi_object *ret;
724 u8 cls;
725 int i;
726
727 if (!data->enumerate_handle)
728 return -ENODEV;
729 if (!data->debugfs.id)
730 return -EINVAL;
731
732 cls = (data->debugfs.id & 0xff000000) >> 24;
733 ret = atk_ggrp(data, cls);
734 if (IS_ERR(ret))
735 return PTR_ERR(ret);
736
737 for (i = 0; i < ret->package.count; i++) {
738 union acpi_object *pack = &ret->package.elements[i];
739 union acpi_object *id;
740
741 if (pack->type != ACPI_TYPE_PACKAGE)
742 continue;
743 if (!pack->package.count)
744 continue;
745 id = &pack->package.elements[0];
746 if (id->integer.value == data->debugfs.id) {
747 /* Print the package */
748 buf = kzalloc(512, GFP_KERNEL);
749 if (!buf) {
750 ACPI_FREE(ret);
751 return -ENOMEM;
752 }
753 atk_pack_print(buf, 512, pack);
754 break;
755 }
756 }
757 ACPI_FREE(ret);
758
759 if (!buf)
760 return -EINVAL;
761
762 file->private_data = buf;
763
764 return nonseekable_open(inode, file);
765 }
766
767 static ssize_t atk_debugfs_ggrp_read(struct file *file, char __user *buf,
768 size_t count, loff_t *pos)
769 {
770 char *str = file->private_data;
771 size_t len = strlen(str);
772
773 return simple_read_from_buffer(buf, count, pos, str, len);
774 }
775
776 static int atk_debugfs_ggrp_release(struct inode *inode, struct file *file)
777 {
778 kfree(file->private_data);
779 return 0;
780 }
781
782 static const struct file_operations atk_debugfs_ggrp_fops = {
783 .read = atk_debugfs_ggrp_read,
784 .open = atk_debugfs_ggrp_open,
785 .release = atk_debugfs_ggrp_release,
786 .llseek = no_llseek,
787 };
788
789 static void atk_debugfs_init(struct atk_data *data)
790 {
791 struct dentry *d;
792
793 data->debugfs.id = 0;
794
795 d = debugfs_create_dir("asus_atk0110", NULL);
796
797 debugfs_create_x32("id", 0600, d, &data->debugfs.id);
798 debugfs_create_file_unsafe("gitm", 0400, d, data, &atk_debugfs_gitm);
799 debugfs_create_file("ggrp", 0400, d, data, &atk_debugfs_ggrp_fops);
800
801 data->debugfs.root = d;
802 }
803
804 static void atk_debugfs_cleanup(struct atk_data *data)
805 {
806 debugfs_remove_recursive(data->debugfs.root);
807 }
808
809 #else /* CONFIG_DEBUG_FS */
810
811 static void atk_debugfs_init(struct atk_data *data)
812 {
813 }
814
815 static void atk_debugfs_cleanup(struct atk_data *data)
816 {
817 }
818 #endif
819
820 static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
821 {
822 struct device *dev = &data->acpi_dev->dev;
823 union acpi_object *flags;
824 union acpi_object *name;
825 union acpi_object *limit1;
826 union acpi_object *limit2;
827 union acpi_object *enable;
828 struct atk_sensor_data *sensor;
829 char const *base_name;
830 char const *limit1_name;
831 char const *limit2_name;
832 u64 type;
833 int err;
834 int *num;
835 int start;
836
837 if (obj->type != ACPI_TYPE_PACKAGE) {
838 /* wft is this? */
839 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
840 obj->type);
841 return -EINVAL;
842 }
843
844 err = validate_hwmon_pack(data, obj);
845 if (err)
846 return err;
847
848 /* Ok, we have a valid hwmon package */
849 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
850 & ATK_TYPE_MASK;
851
852 switch (type) {
853 case HWMON_TYPE_VOLT:
854 base_name = "in";
855 limit1_name = "min";
856 limit2_name = "max";
857 num = &data->voltage_count;
858 start = 0;
859 break;
860 case HWMON_TYPE_TEMP:
861 base_name = "temp";
862 limit1_name = "max";
863 limit2_name = "crit";
864 num = &data->temperature_count;
865 start = 1;
866 break;
867 case HWMON_TYPE_FAN:
868 base_name = "fan";
869 limit1_name = "min";
870 limit2_name = "max";
871 num = &data->fan_count;
872 start = 1;
873 break;
874 default:
875 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
876 return -EINVAL;
877 }
878
879 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
880 if (!enable->integer.value)
881 /* sensor is disabled */
882 return 0;
883
884 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
885 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
886 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
887 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
888
889 sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
890 if (!sensor)
891 return -ENOMEM;
892
893 sensor->acpi_name = devm_kstrdup(dev, name->string.pointer, GFP_KERNEL);
894 if (!sensor->acpi_name)
895 return -ENOMEM;
896
897 INIT_LIST_HEAD(&sensor->list);
898 sensor->type = type;
899 sensor->data = data;
900 sensor->id = flags->integer.value;
901 sensor->limit1 = limit1->integer.value;
902 if (data->old_interface)
903 sensor->limit2 = limit2->integer.value;
904 else
905 /* The upper limit is expressed as delta from lower limit */
906 sensor->limit2 = sensor->limit1 + limit2->integer.value;
907
908 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
909 "%s%d_input", base_name, start + *num);
910 atk_init_attribute(&sensor->input_attr,
911 sensor->input_attr_name,
912 atk_input_show);
913
914 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
915 "%s%d_label", base_name, start + *num);
916 atk_init_attribute(&sensor->label_attr,
917 sensor->label_attr_name,
918 atk_label_show);
919
920 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
921 "%s%d_%s", base_name, start + *num, limit1_name);
922 atk_init_attribute(&sensor->limit1_attr,
923 sensor->limit1_attr_name,
924 atk_limit1_show);
925
926 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
927 "%s%d_%s", base_name, start + *num, limit2_name);
928 atk_init_attribute(&sensor->limit2_attr,
929 sensor->limit2_attr_name,
930 atk_limit2_show);
931
932 list_add(&sensor->list, &data->sensor_list);
933 (*num)++;
934
935 return 1;
936 }
937
938 static int atk_enumerate_old_hwmon(struct atk_data *data)
939 {
940 struct device *dev = &data->acpi_dev->dev;
941 struct acpi_buffer buf;
942 union acpi_object *pack;
943 acpi_status status;
944 int i, ret;
945 int count = 0;
946
947 /* Voltages */
948 buf.length = ACPI_ALLOCATE_BUFFER;
949 status = acpi_evaluate_object_typed(data->atk_handle,
950 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
951 if (status != AE_OK) {
952 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
953 acpi_format_exception(status));
954
955 return -ENODEV;
956 }
957
958 pack = buf.pointer;
959 for (i = 1; i < pack->package.count; i++) {
960 union acpi_object *obj = &pack->package.elements[i];
961
962 ret = atk_add_sensor(data, obj);
963 if (ret > 0)
964 count++;
965 }
966 ACPI_FREE(buf.pointer);
967
968 /* Temperatures */
969 buf.length = ACPI_ALLOCATE_BUFFER;
970 status = acpi_evaluate_object_typed(data->atk_handle,
971 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
972 if (status != AE_OK) {
973 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
974 acpi_format_exception(status));
975
976 return -ENODEV;
977 }
978
979 pack = buf.pointer;
980 for (i = 1; i < pack->package.count; i++) {
981 union acpi_object *obj = &pack->package.elements[i];
982
983 ret = atk_add_sensor(data, obj);
984 if (ret > 0)
985 count++;
986 }
987 ACPI_FREE(buf.pointer);
988
989 /* Fans */
990 buf.length = ACPI_ALLOCATE_BUFFER;
991 status = acpi_evaluate_object_typed(data->atk_handle,
992 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
993 if (status != AE_OK) {
994 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
995 acpi_format_exception(status));
996
997 return -ENODEV;
998 }
999
1000 pack = buf.pointer;
1001 for (i = 1; i < pack->package.count; i++) {
1002 union acpi_object *obj = &pack->package.elements[i];
1003
1004 ret = atk_add_sensor(data, obj);
1005 if (ret > 0)
1006 count++;
1007 }
1008 ACPI_FREE(buf.pointer);
1009
1010 return count;
1011 }
1012
1013 static int atk_ec_present(struct atk_data *data)
1014 {
1015 struct device *dev = &data->acpi_dev->dev;
1016 union acpi_object *pack;
1017 union acpi_object *ec;
1018 int ret;
1019 int i;
1020
1021 pack = atk_ggrp(data, ATK_MUX_MGMT);
1022 if (IS_ERR(pack)) {
1023 if (PTR_ERR(pack) == -ENOENT) {
1024 /* The MGMT class does not exists - that's ok */
1025 dev_dbg(dev, "Class %#llx not found\n", ATK_MUX_MGMT);
1026 return 0;
1027 }
1028 return PTR_ERR(pack);
1029 }
1030
1031 /* Search the EC */
1032 ec = NULL;
1033 for (i = 0; i < pack->package.count; i++) {
1034 union acpi_object *obj = &pack->package.elements[i];
1035 union acpi_object *id;
1036
1037 if (obj->type != ACPI_TYPE_PACKAGE)
1038 continue;
1039
1040 id = &obj->package.elements[0];
1041 if (id->type != ACPI_TYPE_INTEGER)
1042 continue;
1043
1044 if (id->integer.value == ATK_EC_ID) {
1045 ec = obj;
1046 break;
1047 }
1048 }
1049
1050 ret = (ec != NULL);
1051 if (!ret)
1052 /* The system has no EC */
1053 dev_dbg(dev, "EC not found\n");
1054
1055 ACPI_FREE(pack);
1056 return ret;
1057 }
1058
1059 static int atk_ec_enabled(struct atk_data *data)
1060 {
1061 struct device *dev = &data->acpi_dev->dev;
1062 union acpi_object *obj;
1063 struct atk_acpi_ret_buffer *buf;
1064 int err;
1065
1066 obj = atk_gitm(data, ATK_EC_ID);
1067 if (IS_ERR(obj)) {
1068 dev_err(dev, "Unable to query EC status\n");
1069 return PTR_ERR(obj);
1070 }
1071 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1072
1073 if (buf->flags == 0) {
1074 dev_err(dev, "Unable to query EC status\n");
1075 err = -EIO;
1076 } else {
1077 err = (buf->value != 0);
1078 dev_dbg(dev, "EC is %sabled\n",
1079 err ? "en" : "dis");
1080 }
1081
1082 ACPI_FREE(obj);
1083 return err;
1084 }
1085
1086 static int atk_ec_ctl(struct atk_data *data, int enable)
1087 {
1088 struct device *dev = &data->acpi_dev->dev;
1089 union acpi_object *obj;
1090 struct atk_acpi_input_buf sitm;
1091 struct atk_acpi_ret_buffer *ec_ret;
1092 int err = 0;
1093
1094 sitm.id = ATK_EC_ID;
1095 sitm.param1 = enable;
1096 sitm.param2 = 0;
1097
1098 obj = atk_sitm(data, &sitm);
1099 if (IS_ERR(obj)) {
1100 dev_err(dev, "Failed to %sable the EC\n",
1101 enable ? "en" : "dis");
1102 return PTR_ERR(obj);
1103 }
1104 ec_ret = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1105 if (ec_ret->flags == 0) {
1106 dev_err(dev, "Failed to %sable the EC\n",
1107 enable ? "en" : "dis");
1108 err = -EIO;
1109 } else {
1110 dev_info(dev, "EC %sabled\n",
1111 enable ? "en" : "dis");
1112 }
1113
1114 ACPI_FREE(obj);
1115 return err;
1116 }
1117
1118 static int atk_enumerate_new_hwmon(struct atk_data *data)
1119 {
1120 struct device *dev = &data->acpi_dev->dev;
1121 union acpi_object *pack;
1122 int err;
1123 int i;
1124
1125 err = atk_ec_present(data);
1126 if (err < 0)
1127 return err;
1128 if (err) {
1129 err = atk_ec_enabled(data);
1130 if (err < 0)
1131 return err;
1132 /* If the EC was disabled we will disable it again on unload */
1133 data->disable_ec = err;
1134
1135 err = atk_ec_ctl(data, 1);
1136 if (err) {
1137 data->disable_ec = false;
1138 return err;
1139 }
1140 }
1141
1142 dev_dbg(dev, "Enumerating hwmon sensors\n");
1143
1144 pack = atk_ggrp(data, ATK_MUX_HWMON);
1145 if (IS_ERR(pack))
1146 return PTR_ERR(pack);
1147
1148 for (i = 0; i < pack->package.count; i++) {
1149 union acpi_object *obj = &pack->package.elements[i];
1150
1151 atk_add_sensor(data, obj);
1152 }
1153
1154 err = data->voltage_count + data->temperature_count + data->fan_count;
1155
1156 ACPI_FREE(pack);
1157 return err;
1158 }
1159
1160 static int atk_init_attribute_groups(struct atk_data *data)
1161 {
1162 struct device *dev = &data->acpi_dev->dev;
1163 struct atk_sensor_data *s;
1164 struct attribute **attrs;
1165 int i = 0;
1166 int len = (data->voltage_count + data->temperature_count
1167 + data->fan_count) * 4 + 1;
1168
1169 attrs = devm_kcalloc(dev, len, sizeof(struct attribute *), GFP_KERNEL);
1170 if (!attrs)
1171 return -ENOMEM;
1172
1173 list_for_each_entry(s, &data->sensor_list, list) {
1174 attrs[i++] = &s->input_attr.attr;
1175 attrs[i++] = &s->label_attr.attr;
1176 attrs[i++] = &s->limit1_attr.attr;
1177 attrs[i++] = &s->limit2_attr.attr;
1178 }
1179
1180 data->attr_group.attrs = attrs;
1181 data->attr_groups[0] = &data->attr_group;
1182
1183 return 0;
1184 }
1185
1186 static int atk_register_hwmon(struct atk_data *data)
1187 {
1188 struct device *dev = &data->acpi_dev->dev;
1189
1190 dev_dbg(dev, "registering hwmon device\n");
1191 data->hwmon_dev = hwmon_device_register_with_groups(dev, "atk0110",
1192 data,
1193 data->attr_groups);
1194
1195 return PTR_ERR_OR_ZERO(data->hwmon_dev);
1196 }
1197
1198 static int atk_probe_if(struct atk_data *data)
1199 {
1200 struct device *dev = &data->acpi_dev->dev;
1201 acpi_handle ret;
1202 acpi_status status;
1203 int err = 0;
1204
1205 /* RTMP: read temperature */
1206 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
1207 if (ACPI_SUCCESS(status))
1208 data->rtmp_handle = ret;
1209 else
1210 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
1211 acpi_format_exception(status));
1212
1213 /* RVLT: read voltage */
1214 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
1215 if (ACPI_SUCCESS(status))
1216 data->rvlt_handle = ret;
1217 else
1218 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
1219 acpi_format_exception(status));
1220
1221 /* RFAN: read fan status */
1222 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
1223 if (ACPI_SUCCESS(status))
1224 data->rfan_handle = ret;
1225 else
1226 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
1227 acpi_format_exception(status));
1228
1229 /* Enumeration */
1230 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
1231 if (ACPI_SUCCESS(status))
1232 data->enumerate_handle = ret;
1233 else
1234 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
1235 acpi_format_exception(status));
1236
1237 /* De-multiplexer (read) */
1238 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
1239 if (ACPI_SUCCESS(status))
1240 data->read_handle = ret;
1241 else
1242 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
1243 acpi_format_exception(status));
1244
1245 /* De-multiplexer (write) */
1246 status = acpi_get_handle(data->atk_handle, METHOD_WRITE, &ret);
1247 if (ACPI_SUCCESS(status))
1248 data->write_handle = ret;
1249 else
1250 dev_dbg(dev, "method " METHOD_WRITE " not found: %s\n",
1251 acpi_format_exception(status));
1252
1253 /*
1254 * Check for hwmon methods: first check "old" style methods; note that
1255 * both may be present: in this case we stick to the old interface;
1256 * analysis of multiple DSDTs indicates that when both interfaces
1257 * are present the new one (GGRP/GITM) is not functional.
1258 */
1259 if (new_if)
1260 dev_info(dev, "Overriding interface detection\n");
1261 if (data->rtmp_handle &&
1262 data->rvlt_handle && data->rfan_handle && !new_if)
1263 data->old_interface = true;
1264 else if (data->enumerate_handle && data->read_handle &&
1265 data->write_handle)
1266 data->old_interface = false;
1267 else
1268 err = -ENODEV;
1269
1270 return err;
1271 }
1272
1273 static int atk_add(struct acpi_device *device)
1274 {
1275 acpi_status ret;
1276 int err;
1277 struct acpi_buffer buf;
1278 union acpi_object *obj;
1279 struct atk_data *data;
1280
1281 dev_dbg(&device->dev, "adding...\n");
1282
1283 data = devm_kzalloc(&device->dev, sizeof(*data), GFP_KERNEL);
1284 if (!data)
1285 return -ENOMEM;
1286
1287 data->acpi_dev = device;
1288 data->atk_handle = device->handle;
1289 INIT_LIST_HEAD(&data->sensor_list);
1290 data->disable_ec = false;
1291
1292 buf.length = ACPI_ALLOCATE_BUFFER;
1293 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
1294 &buf, ACPI_TYPE_PACKAGE);
1295 if (ret != AE_OK) {
1296 dev_dbg(&device->dev, "atk: method MBIF not found\n");
1297 } else {
1298 obj = buf.pointer;
1299 if (obj->package.count >= 2) {
1300 union acpi_object *id = &obj->package.elements[1];
1301 if (id->type == ACPI_TYPE_STRING)
1302 dev_dbg(&device->dev, "board ID = %s\n",
1303 id->string.pointer);
1304 }
1305 ACPI_FREE(buf.pointer);
1306 }
1307
1308 err = atk_probe_if(data);
1309 if (err) {
1310 dev_err(&device->dev, "No usable hwmon interface detected\n");
1311 goto out;
1312 }
1313
1314 if (data->old_interface) {
1315 dev_dbg(&device->dev, "Using old hwmon interface\n");
1316 err = atk_enumerate_old_hwmon(data);
1317 } else {
1318 dev_dbg(&device->dev, "Using new hwmon interface\n");
1319 err = atk_enumerate_new_hwmon(data);
1320 }
1321 if (err < 0)
1322 goto out;
1323 if (err == 0) {
1324 dev_info(&device->dev,
1325 "No usable sensor detected, bailing out\n");
1326 err = -ENODEV;
1327 goto out;
1328 }
1329
1330 err = atk_init_attribute_groups(data);
1331 if (err)
1332 goto out;
1333 err = atk_register_hwmon(data);
1334 if (err)
1335 goto out;
1336
1337 atk_debugfs_init(data);
1338
1339 device->driver_data = data;
1340 return 0;
1341 out:
1342 if (data->disable_ec)
1343 atk_ec_ctl(data, 0);
1344 return err;
1345 }
1346
1347 static int atk_remove(struct acpi_device *device)
1348 {
1349 struct atk_data *data = device->driver_data;
1350 dev_dbg(&device->dev, "removing...\n");
1351
1352 device->driver_data = NULL;
1353
1354 atk_debugfs_cleanup(data);
1355
1356 hwmon_device_unregister(data->hwmon_dev);
1357
1358 if (data->disable_ec) {
1359 if (atk_ec_ctl(data, 0))
1360 dev_err(&device->dev, "Failed to disable EC\n");
1361 }
1362
1363 return 0;
1364 }
1365
1366 static int __init atk0110_init(void)
1367 {
1368 int ret;
1369
1370 /* Make sure it's safe to access the device through ACPI */
1371 if (!acpi_resources_are_enforced()) {
1372 pr_err("Resources not safely usable due to acpi_enforce_resources kernel parameter\n");
1373 return -EBUSY;
1374 }
1375
1376 if (dmi_check_system(atk_force_new_if))
1377 new_if = true;
1378
1379 ret = acpi_bus_register_driver(&atk_driver);
1380 if (ret)
1381 pr_info("acpi_bus_register_driver failed: %d\n", ret);
1382
1383 return ret;
1384 }
1385
1386 static void __exit atk0110_exit(void)
1387 {
1388 acpi_bus_unregister_driver(&atk_driver);
1389 }
1390
1391 module_init(atk0110_init);
1392 module_exit(atk0110_exit);
1393
1394 MODULE_LICENSE("GPL");
Linux with added FPC-III support