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hwmon: (smsc47m1) Differentiate between LPC47M233 and LPC47M292
[mirror_ubuntu-bionic-kernel.git] / drivers / hwmon / asus_atk0110.c
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2c03d07a
LT		 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#include <linux/kernel.h>
9#include <linux/hwmon.h>
10#include <linux/list.h>
11#include <linux/module.h>
12
13#include <acpi/acpi.h>
14#include <acpi/acpixf.h>
15#include <acpi/acpi_drivers.h>
16#include <acpi/acpi_bus.h>
17
18
19#define ATK_HID "ATK0110"
20
21/* Minimum time between readings, enforced in order to avoid
22 * hogging the CPU.
23 */
24#define CACHE_TIME HZ
25
26#define BOARD_ID "MBIF"
27#define METHOD_ENUMERATE "GGRP"
28#define METHOD_READ "GITM"
29#define METHOD_WRITE "SITM"
30#define METHOD_OLD_READ_TMP "RTMP"
31#define METHOD_OLD_READ_VLT "RVLT"
32#define METHOD_OLD_READ_FAN "RFAN"
33#define METHOD_OLD_ENUM_TMP "TSIF"
34#define METHOD_OLD_ENUM_VLT "VSIF"
35#define METHOD_OLD_ENUM_FAN "FSIF"
36
37#define ATK_MUX_HWMON 0x00000006ULL
38
39#define ATK_CLASS_MASK 0xff000000ULL
40#define ATK_CLASS_FREQ_CTL 0x03000000ULL
41#define ATK_CLASS_FAN_CTL 0x04000000ULL
42#define ATK_CLASS_HWMON 0x06000000ULL
43
44#define ATK_TYPE_MASK 0x00ff0000ULL
45#define HWMON_TYPE_VOLT 0x00020000ULL
46#define HWMON_TYPE_TEMP 0x00030000ULL
47#define HWMON_TYPE_FAN 0x00040000ULL
48
49#define HWMON_SENSOR_ID_MASK 0x0000ffffULL
50
51enum atk_pack_member {
52 HWMON_PACK_FLAGS,
53 HWMON_PACK_NAME,
54 HWMON_PACK_LIMIT1,
55 HWMON_PACK_LIMIT2,
56 HWMON_PACK_ENABLE
57};
58
59/* New package format */
60#define _HWMON_NEW_PACK_SIZE 7
61#define _HWMON_NEW_PACK_FLAGS 0
62#define _HWMON_NEW_PACK_NAME 1
63#define _HWMON_NEW_PACK_UNK1 2
64#define _HWMON_NEW_PACK_UNK2 3
65#define _HWMON_NEW_PACK_LIMIT1 4
66#define _HWMON_NEW_PACK_LIMIT2 5
67#define _HWMON_NEW_PACK_ENABLE 6
68
69/* Old package format */
70#define _HWMON_OLD_PACK_SIZE 5
71#define _HWMON_OLD_PACK_FLAGS 0
72#define _HWMON_OLD_PACK_NAME 1
73#define _HWMON_OLD_PACK_LIMIT1 2
74#define _HWMON_OLD_PACK_LIMIT2 3
75#define _HWMON_OLD_PACK_ENABLE 4
76
77
78struct atk_data {
79 struct device *hwmon_dev;
80 acpi_handle atk_handle;
81 struct acpi_device *acpi_dev;
82
83 bool old_interface;
84
85 /* old interface */
86 acpi_handle rtmp_handle;
87 acpi_handle rvlt_handle;
88 acpi_handle rfan_handle;
89 /* new inteface */
90 acpi_handle enumerate_handle;
91 acpi_handle read_handle;
92
93 int voltage_count;
94 int temperature_count;
95 int fan_count;
96 struct list_head sensor_list;
97};
98
99
100typedef ssize_t (*sysfs_show_func)(struct device *dev,
101 struct device_attribute *attr, char *buf);
102
103static const struct acpi_device_id atk_ids[] = {
104 {ATK_HID, 0},
105 {"", 0},
106};
107MODULE_DEVICE_TABLE(acpi, atk_ids);
108
109#define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */
110
111struct atk_sensor_data {
112 struct list_head list;
113 struct atk_data *data;
114 struct device_attribute label_attr;
115 struct device_attribute input_attr;
116 struct device_attribute limit1_attr;
117 struct device_attribute limit2_attr;
118 char label_attr_name[ATTR_NAME_SIZE];
119 char input_attr_name[ATTR_NAME_SIZE];
120 char limit1_attr_name[ATTR_NAME_SIZE];
121 char limit2_attr_name[ATTR_NAME_SIZE];
122 u64 id;
123 u64 type;
124 u64 limit1;
125 u64 limit2;
126 u64 cached_value;
127 unsigned long last_updated; /* in jiffies */
128 bool is_valid;
129 char const *acpi_name;
130};
131
132struct atk_acpi_buffer_u64 {
133 union acpi_object buf;
134 u64 value;
135};
136
137static int atk_add(struct acpi_device *device);
138static int atk_remove(struct acpi_device *device, int type);
139static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
140static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
141static void atk_free_sensors(struct atk_data *data);
142
143static struct acpi_driver atk_driver = {
144 .name = ATK_HID,
145 .class = "hwmon",
146 .ids = atk_ids,
147 .ops = {
148 .add = atk_add,
149 .remove = atk_remove,
150 },
151};
152
153#define input_to_atk_sensor(attr) \
154 container_of(attr, struct atk_sensor_data, input_attr)
155
156#define label_to_atk_sensor(attr) \
157 container_of(attr, struct atk_sensor_data, label_attr)
158
159#define limit1_to_atk_sensor(attr) \
160 container_of(attr, struct atk_sensor_data, limit1_attr)
161
162#define limit2_to_atk_sensor(attr) \
163 container_of(attr, struct atk_sensor_data, limit2_attr)
164
165static ssize_t atk_input_show(struct device *dev,
166 struct device_attribute *attr, char *buf)
167{
168 struct atk_sensor_data *s = input_to_atk_sensor(attr);
169 u64 value;
170 int err;
171
172 err = atk_read_value(s, &value);
173 if (err)
174 return err;
175
176 if (s->type == HWMON_TYPE_TEMP)
177 /* ACPI returns decidegree */
178 value *= 100;
179
180 return sprintf(buf, "%llu\n", value);
181}
182
183static ssize_t atk_label_show(struct device *dev,
184 struct device_attribute *attr, char *buf)
185{
186 struct atk_sensor_data *s = label_to_atk_sensor(attr);
187
188 return sprintf(buf, "%s\n", s->acpi_name);
189}
190
191static ssize_t atk_limit1_show(struct device *dev,
192 struct device_attribute *attr, char *buf)
193{
194 struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
195 u64 value = s->limit1;
196
197 if (s->type == HWMON_TYPE_TEMP)
198 value *= 100;
199
200 return sprintf(buf, "%lld\n", value);
201}
202
203static ssize_t atk_limit2_show(struct device *dev,
204 struct device_attribute *attr, char *buf)
205{
206 struct atk_sensor_data *s = limit2_to_atk_sensor(attr);
207 u64 value = s->limit2;
208
209 if (s->type == HWMON_TYPE_TEMP)
210 value *= 100;
211
212 return sprintf(buf, "%lld\n", value);
213}
214
215static ssize_t atk_name_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
217{
218 return sprintf(buf, "atk0110\n");
219}
220static struct device_attribute atk_name_attr =
221 __ATTR(name, 0444, atk_name_show, NULL);
222
223static void atk_init_attribute(struct device_attribute *attr, char *name,
224 sysfs_show_func show)
225{
226 attr->attr.name = name;
227 attr->attr.mode = 0444;
228 attr->show = show;
229 attr->store = NULL;
230}
231
232
233static union acpi_object *atk_get_pack_member(struct atk_data *data,
234 union acpi_object *pack,
235 enum atk_pack_member m)
236{
237 bool old_if = data->old_interface;
238 int offset;
239
240 switch (m) {
241 case HWMON_PACK_FLAGS:
242 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS;
243 break;
244 case HWMON_PACK_NAME:
245 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME;
246 break;
247 case HWMON_PACK_LIMIT1:
248 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 :
249 _HWMON_NEW_PACK_LIMIT1;
250 break;
251 case HWMON_PACK_LIMIT2:
252 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 :
253 _HWMON_NEW_PACK_LIMIT2;
254 break;
255 case HWMON_PACK_ENABLE:
256 offset = old_if ? _HWMON_OLD_PACK_ENABLE :
257 _HWMON_NEW_PACK_ENABLE;
258 break;
259 default:
260 return NULL;
261 }
262
263 return &pack->package.elements[offset];
264}
265
266
267/* New package format is:
268 * - flag (int)
269 * class - used for de-muxing the request to the correct GITn
270 * type (volt, temp, fan)
271 * sensor id |
272 * sensor id - used for de-muxing the request _inside_ the GITn
273 * - name (str)
274 * - unknown (int)
275 * - unknown (int)
276 * - limit1 (int)
277 * - limit2 (int)
278 * - enable (int)
279 *
280 * The old package has the same format but it's missing the two unknown fields.
281 */
282static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj)
283{
284 struct device *dev = &data->acpi_dev->dev;
285 union acpi_object *tmp;
286 bool old_if = data->old_interface;
287 int const expected_size = old_if ? _HWMON_OLD_PACK_SIZE :
288 _HWMON_NEW_PACK_SIZE;
289
290 if (obj->type != ACPI_TYPE_PACKAGE) {
291 dev_warn(dev, "Invalid type: %d\n", obj->type);
292 return -EINVAL;
293 }
294
295 if (obj->package.count != expected_size) {
296 dev_warn(dev, "Invalid package size: %d, expected: %d\n",
297 obj->package.count, expected_size);
298 return -EINVAL;
299 }
300
301 tmp = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
302 if (tmp->type != ACPI_TYPE_INTEGER) {
303 dev_warn(dev, "Invalid type (flag): %d\n", tmp->type);
304 return -EINVAL;
305 }
306
307 tmp = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
308 if (tmp->type != ACPI_TYPE_STRING) {
309 dev_warn(dev, "Invalid type (name): %d\n", tmp->type);
310 return -EINVAL;
311 }
312
313 /* Don't check... we don't know what they're useful for anyway */
314#if 0
315 tmp = &obj->package.elements[HWMON_PACK_UNK1];
316 if (tmp->type != ACPI_TYPE_INTEGER) {
317 dev_warn(dev, "Invalid type (unk1): %d\n", tmp->type);
318 return -EINVAL;
319 }
320
321 tmp = &obj->package.elements[HWMON_PACK_UNK2];
322 if (tmp->type != ACPI_TYPE_INTEGER) {
323 dev_warn(dev, "Invalid type (unk2): %d\n", tmp->type);
324 return -EINVAL;
325 }
326#endif
327
328 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
329 if (tmp->type != ACPI_TYPE_INTEGER) {
330 dev_warn(dev, "Invalid type (limit1): %d\n", tmp->type);
331 return -EINVAL;
332 }
333
334 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
335 if (tmp->type != ACPI_TYPE_INTEGER) {
336 dev_warn(dev, "Invalid type (limit2): %d\n", tmp->type);
337 return -EINVAL;
338 }
339
340 tmp = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
341 if (tmp->type != ACPI_TYPE_INTEGER) {
342 dev_warn(dev, "Invalid type (enable): %d\n", tmp->type);
343 return -EINVAL;
344 }
345
346 atk_print_sensor(data, obj);
347
348 return 0;
349}
350
b9008708 351#ifdef DEBUG
2c03d07a
LT		 352static char const *atk_sensor_type(union acpi_object *flags)
353{
354 u64 type = flags->integer.value & ATK_TYPE_MASK;
355 char const *what;
356
357 switch (type) {
358 case HWMON_TYPE_VOLT:
359 what = "voltage";
360 break;
361 case HWMON_TYPE_TEMP:
362 what = "temperature";
363 break;
364 case HWMON_TYPE_FAN:
365 what = "fan";
366 break;
367 default:
368 what = "unknown";
369 break;
370 }
371
372 return what;
373}
b9008708 374#endif
2c03d07a
LT		 375
376static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
377{
378#ifdef DEBUG
379 struct device *dev = &data->acpi_dev->dev;
380 union acpi_object *flags;
381 union acpi_object *name;
382 union acpi_object *limit1;
383 union acpi_object *limit2;
384 union acpi_object *enable;
385 char const *what;
386
387 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
388 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
389 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
390 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
391 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
392
393 what = atk_sensor_type(flags);
394
395 dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what,
396 flags->integer.value,
397 name->string.pointer,
398 limit1->integer.value, limit2->integer.value,
399 enable->integer.value ? "enabled" : "disabled");
400#endif
401}
402
403static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
404{
405 struct atk_data *data = sensor->data;
406 struct device *dev = &data->acpi_dev->dev;
407 struct acpi_object_list params;
408 union acpi_object id;
409 acpi_status status;
410 acpi_handle method;
411
412 switch (sensor->type) {
413 case HWMON_TYPE_VOLT:
414 method = data->rvlt_handle;
415 break;
416 case HWMON_TYPE_TEMP:
417 method = data->rtmp_handle;
418 break;
419 case HWMON_TYPE_FAN:
420 method = data->rfan_handle;
421 break;
422 default:
423 return -EINVAL;
424 }
425
426 id.type = ACPI_TYPE_INTEGER;
427 id.integer.value = sensor->id;
428
429 params.count = 1;
430 params.pointer = &id;
431
432 status = acpi_evaluate_integer(method, NULL, &params, value);
433 if (status != AE_OK) {
434 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
435 acpi_format_exception(status));
436 return -EIO;
437 }
438
439 return 0;
440}
441
442static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
443{
444 struct atk_data *data = sensor->data;
445 struct device *dev = &data->acpi_dev->dev;
446 struct acpi_object_list params;
447 struct acpi_buffer ret;
448 union acpi_object id;
449 struct atk_acpi_buffer_u64 tmp;
450 acpi_status status;
451
452 id.type = ACPI_TYPE_INTEGER;
453 id.integer.value = sensor->id;
454
455 params.count = 1;
456 params.pointer = &id;
457
458 tmp.buf.type = ACPI_TYPE_BUFFER;
459 tmp.buf.buffer.pointer = (u8 *)&tmp.value;
460 tmp.buf.buffer.length = sizeof(u64);
461 ret.length = sizeof(tmp);
462 ret.pointer = &tmp;
463
464 status = acpi_evaluate_object_typed(data->read_handle, NULL, &params,
465 &ret, ACPI_TYPE_BUFFER);
466 if (status != AE_OK) {
467 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
468 acpi_format_exception(status));
469 return -EIO;
470 }
471
472 /* Return buffer format:
473 * [0-3] "value" is valid flag
474 * [4-7] value
475 */
476 if (!(tmp.value & 0xffffffff)) {
477 /* The reading is not valid, possible causes:
478 * - sensor failure
479 * - enumeration was FUBAR (and we didn't notice)
480 */
481 dev_info(dev, "Failure: %#llx\n", tmp.value);
482 return -EIO;
483 }
484
485 *value = (tmp.value & 0xffffffff00000000ULL) >> 32;
486
487 return 0;
488}
489
490static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
491{
492 int err;
493
494 if (!sensor->is_valid ||
495 time_after(jiffies, sensor->last_updated + CACHE_TIME)) {
496 if (sensor->data->old_interface)
497 err = atk_read_value_old(sensor, value);
498 else
499 err = atk_read_value_new(sensor, value);
500
501 sensor->is_valid = true;
502 sensor->last_updated = jiffies;
503 sensor->cached_value = *value;
504 } else {
505 *value = sensor->cached_value;
506 err = 0;
507 }
508
509 return err;
510}
511
512static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
513{
514 struct device *dev = &data->acpi_dev->dev;
515 union acpi_object *flags;
516 union acpi_object *name;
517 union acpi_object *limit1;
518 union acpi_object *limit2;
519 union acpi_object *enable;
520 struct atk_sensor_data *sensor;
521 char const *base_name;
522 char const *limit1_name;
523 char const *limit2_name;
524 u64 type;
525 int err;
526 int *num;
527 int start;
528
529 if (obj->type != ACPI_TYPE_PACKAGE) {
530 /* wft is this? */
531 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
532 obj->type);
533 return -EINVAL;
534 }
535
536 err = validate_hwmon_pack(data, obj);
537 if (err)
538 return err;
539
540 /* Ok, we have a valid hwmon package */
541 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
542 & ATK_TYPE_MASK;
543
544 switch (type) {
545 case HWMON_TYPE_VOLT:
546 base_name = "in";
547 limit1_name = "min";
548 limit2_name = "max";
549 num = &data->voltage_count;
550 start = 0;
551 break;
552 case HWMON_TYPE_TEMP:
553 base_name = "temp";
554 limit1_name = "max";
555 limit2_name = "crit";
556 num = &data->temperature_count;
557 start = 1;
558 break;
559 case HWMON_TYPE_FAN:
560 base_name = "fan";
561 limit1_name = "min";
562 limit2_name = "max";
563 num = &data->fan_count;
564 start = 1;
565 break;
566 default:
567 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
568 return -EINVAL;
569 }
570
571 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
572 if (!enable->integer.value)
573 /* sensor is disabled */
574 return 0;
575
576 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
577 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
578 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
579 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
580
581 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
582 if (!sensor)
583 return -ENOMEM;
584
585 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
586 if (!sensor->acpi_name) {
587 err = -ENOMEM;
588 goto out;
589 }
590
591 INIT_LIST_HEAD(&sensor->list);
592 sensor->type = type;
593 sensor->data = data;
594 sensor->id = flags->integer.value;
595 sensor->limit1 = limit1->integer.value;
596 sensor->limit2 = limit2->integer.value;
597
598 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
599 "%s%d_input", base_name, start + *num);
600 atk_init_attribute(&sensor->input_attr,
601 sensor->input_attr_name,
602 atk_input_show);
603
604 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
605 "%s%d_label", base_name, start + *num);
606 atk_init_attribute(&sensor->label_attr,
607 sensor->label_attr_name,
608 atk_label_show);
609
610 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
611 "%s%d_%s", base_name, start + *num, limit1_name);
612 atk_init_attribute(&sensor->limit1_attr,
613 sensor->limit1_attr_name,
614 atk_limit1_show);
615
616 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
617 "%s%d_%s", base_name, start + *num, limit2_name);
618 atk_init_attribute(&sensor->limit2_attr,
619 sensor->limit2_attr_name,
620 atk_limit2_show);
621
622 list_add(&sensor->list, &data->sensor_list);
623 (*num)++;
624
625 return 1;
626out:
627 kfree(sensor->acpi_name);
628 kfree(sensor);
629 return err;
630}
631
632static int atk_enumerate_old_hwmon(struct atk_data *data)
633{
634 struct device *dev = &data->acpi_dev->dev;
635 struct acpi_buffer buf;
636 union acpi_object *pack;
637 acpi_status status;
638 int i, ret;
639 int count = 0;
640
641 /* Voltages */
642 buf.length = ACPI_ALLOCATE_BUFFER;
643 status = acpi_evaluate_object_typed(data->atk_handle,
644 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
645 if (status != AE_OK) {
646 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
647 acpi_format_exception(status));
648
649 return -ENODEV;
650 }
651
652 pack = buf.pointer;
653 for (i = 1; i < pack->package.count; i++) {
654 union acpi_object *obj = &pack->package.elements[i];
655
656 ret = atk_add_sensor(data, obj);
657 if (ret > 0)
658 count++;
659 }
660 ACPI_FREE(buf.pointer);
661
662 /* Temperatures */
663 buf.length = ACPI_ALLOCATE_BUFFER;
664 status = acpi_evaluate_object_typed(data->atk_handle,
665 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
666 if (status != AE_OK) {
667 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
668 acpi_format_exception(status));
669
670 ret = -ENODEV;
671 goto cleanup;
672 }
673
674 pack = buf.pointer;
675 for (i = 1; i < pack->package.count; i++) {
676 union acpi_object *obj = &pack->package.elements[i];
677
678 ret = atk_add_sensor(data, obj);
679 if (ret > 0)
680 count++;
681 }
682 ACPI_FREE(buf.pointer);
683
684 /* Fans */
685 buf.length = ACPI_ALLOCATE_BUFFER;
686 status = acpi_evaluate_object_typed(data->atk_handle,
687 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
688 if (status != AE_OK) {
689 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
690 acpi_format_exception(status));
691
692 ret = -ENODEV;
693 goto cleanup;
694 }
695
696 pack = buf.pointer;
697 for (i = 1; i < pack->package.count; i++) {
698 union acpi_object *obj = &pack->package.elements[i];
699
700 ret = atk_add_sensor(data, obj);
701 if (ret > 0)
702 count++;
703 }
704 ACPI_FREE(buf.pointer);
705
706 return count;
707cleanup:
708 atk_free_sensors(data);
709 return ret;
710}
711
712static int atk_enumerate_new_hwmon(struct atk_data *data)
713{
714 struct device *dev = &data->acpi_dev->dev;
715 struct acpi_buffer buf;
716 acpi_status ret;
717 struct acpi_object_list params;
718 union acpi_object id;
719 union acpi_object *pack;
720 int err;
721 int i;
722
723 dev_dbg(dev, "Enumerating hwmon sensors\n");
724
725 id.type = ACPI_TYPE_INTEGER;
726 id.integer.value = ATK_MUX_HWMON;
727 params.count = 1;
728 params.pointer = &id;
729
730 buf.length = ACPI_ALLOCATE_BUFFER;
731 ret = acpi_evaluate_object_typed(data->enumerate_handle, NULL, &params,
732 &buf, ACPI_TYPE_PACKAGE);
733 if (ret != AE_OK) {
734 dev_warn(dev, METHOD_ENUMERATE ": ACPI exception: %s\n",
735 acpi_format_exception(ret));
736 return -ENODEV;
737 }
738
739 /* Result must be a package */
740 pack = buf.pointer;
741
742 if (pack->package.count < 1) {
743 dev_dbg(dev, "%s: hwmon package is too small: %d\n", __func__,
744 pack->package.count);
745 err = -EINVAL;
746 goto out;
747 }
748
749 for (i = 0; i < pack->package.count; i++) {
750 union acpi_object *obj = &pack->package.elements[i];
751
752 atk_add_sensor(data, obj);
753 }
754
755 err = data->voltage_count + data->temperature_count + data->fan_count;
756
757out:
758 ACPI_FREE(buf.pointer);
759 return err;
760}
761
762static int atk_create_files(struct atk_data *data)
763{
764 struct atk_sensor_data *s;
765 int err;
766
767 list_for_each_entry(s, &data->sensor_list, list) {
768 err = device_create_file(data->hwmon_dev, &s->input_attr);
769 if (err)
770 return err;
771 err = device_create_file(data->hwmon_dev, &s->label_attr);
772 if (err)
773 return err;
774 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
775 if (err)
776 return err;
777 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
778 if (err)
779 return err;
780 }
781
782 err = device_create_file(data->hwmon_dev, &atk_name_attr);
783
784 return err;
785}
786
787static void atk_remove_files(struct atk_data *data)
788{
789 struct atk_sensor_data *s;
790
791 list_for_each_entry(s, &data->sensor_list, list) {
792 device_remove_file(data->hwmon_dev, &s->input_attr);
793 device_remove_file(data->hwmon_dev, &s->label_attr);
794 device_remove_file(data->hwmon_dev, &s->limit1_attr);
795 device_remove_file(data->hwmon_dev, &s->limit2_attr);
796 }
797 device_remove_file(data->hwmon_dev, &atk_name_attr);
798}
799
800static void atk_free_sensors(struct atk_data *data)
801{
802 struct list_head *head = &data->sensor_list;
803 struct atk_sensor_data *s, *tmp;
804
805 list_for_each_entry_safe(s, tmp, head, list) {
806 kfree(s->acpi_name);
807 kfree(s);
808 }
809}
810
811static int atk_register_hwmon(struct atk_data *data)
812{
813 struct device *dev = &data->acpi_dev->dev;
814 int err;
815
816 dev_dbg(dev, "registering hwmon device\n");
817 data->hwmon_dev = hwmon_device_register(dev);
818 if (IS_ERR(data->hwmon_dev))
819 return PTR_ERR(data->hwmon_dev);
820
821 dev_dbg(dev, "populating sysfs directory\n");
822 err = atk_create_files(data);
823 if (err)
824 goto remove;
825
826 return 0;
827remove:
828 /* Cleanup the registered files */
829 atk_remove_files(data);
830 hwmon_device_unregister(data->hwmon_dev);
831 return err;
832}
833
834static int atk_check_old_if(struct atk_data *data)
835{
836 struct device *dev = &data->acpi_dev->dev;
837 acpi_handle ret;
838 acpi_status status;
839
840 /* RTMP: read temperature */
841 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
842 if (status != AE_OK) {
843 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
844 acpi_format_exception(status));
845 return -ENODEV;
846 }
847 data->rtmp_handle = ret;
848
849 /* RVLT: read voltage */
850 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
851 if (status != AE_OK) {
852 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
853 acpi_format_exception(status));
854 return -ENODEV;
855 }
856 data->rvlt_handle = ret;
857
858 /* RFAN: read fan status */
859 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
860 if (status != AE_OK) {
861 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
862 acpi_format_exception(status));
863 return -ENODEV;
864 }
865 data->rfan_handle = ret;
866
867 return 0;
868}
869
870static int atk_check_new_if(struct atk_data *data)
871{
872 struct device *dev = &data->acpi_dev->dev;
873 acpi_handle ret;
874 acpi_status status;
875
876 /* Enumeration */
877 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
878 if (status != AE_OK) {
879 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
880 acpi_format_exception(status));
881 return -ENODEV;
882 }
883 data->enumerate_handle = ret;
884
885 /* De-multiplexer (read) */
886 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
887 if (status != AE_OK) {
888 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
889 acpi_format_exception(status));
890 return -ENODEV;
891 }
892 data->read_handle = ret;
893
894 return 0;
895}
896
897static int atk_add(struct acpi_device *device)
898{
899 acpi_status ret;
900 int err;
901 struct acpi_buffer buf;
902 union acpi_object *obj;
903 struct atk_data *data;
904
905 dev_dbg(&device->dev, "adding...\n");
906
907 data = kzalloc(sizeof(*data), GFP_KERNEL);
908 if (!data)
909 return -ENOMEM;
910
911 data->acpi_dev = device;
912 data->atk_handle = device->handle;
913 INIT_LIST_HEAD(&data->sensor_list);
914
915 buf.length = ACPI_ALLOCATE_BUFFER;
916 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
917 &buf, ACPI_TYPE_PACKAGE);
918 if (ret != AE_OK) {
919 dev_dbg(&device->dev, "atk: method MBIF not found\n");
920 err = -ENODEV;
921 goto out;
922 }
923
924 obj = buf.pointer;
925 if (obj->package.count >= 2 &&
926 obj->package.elements[1].type == ACPI_TYPE_STRING) {
927 dev_dbg(&device->dev, "board ID = %s\n",
928 obj->package.elements[1].string.pointer);
929 }
930 ACPI_FREE(buf.pointer);
931
932 /* Check for hwmon methods: first check "old" style methods; note that
933 * both may be present: in this case we stick to the old interface;
934 * analysis of multiple DSDTs indicates that when both interfaces
935 * are present the new one (GGRP/GITM) is not functional.
936 */
937 err = atk_check_old_if(data);
938 if (!err) {
939 dev_dbg(&device->dev, "Using old hwmon interface\n");
940 data->old_interface = true;
941 } else {
942 err = atk_check_new_if(data);
943 if (err)
944 goto out;
945
946 dev_dbg(&device->dev, "Using new hwmon interface\n");
947 data->old_interface = false;
948 }
949
950 if (data->old_interface)
951 err = atk_enumerate_old_hwmon(data);
952 else
953 err = atk_enumerate_new_hwmon(data);
954 if (err < 0)
955 goto out;
956 if (err == 0) {
957 dev_info(&device->dev,
958 "No usable sensor detected, bailing out\n");
959 err = -ENODEV;
960 goto out;
961 }
962
963 err = atk_register_hwmon(data);
964 if (err)
965 goto cleanup;
966
967 device->driver_data = data;
968 return 0;
969cleanup:
970 atk_free_sensors(data);
971out:
972 kfree(data);
973 return err;
974}
975
976static int atk_remove(struct acpi_device *device, int type)
977{
978 struct atk_data *data = device->driver_data;
979 dev_dbg(&device->dev, "removing...\n");
980
981 device->driver_data = NULL;
982
983 atk_remove_files(data);
984 atk_free_sensors(data);
985 hwmon_device_unregister(data->hwmon_dev);
986
987 kfree(data);
988
989 return 0;
990}
991
992static int __init atk0110_init(void)
993{
994 int ret;
995
996 ret = acpi_bus_register_driver(&atk_driver);
997 if (ret)
998 pr_info("atk: acpi_bus_register_driver failed: %d\n", ret);
999
1000 return ret;
1001}
1002
1003static void __exit atk0110_exit(void)
1004{
1005 acpi_bus_unregister_driver(&atk_driver);
1006}
1007
1008module_init(atk0110_init);
1009module_exit(atk0110_exit);
1010
1011MODULE_LICENSE("GPL");
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