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path: root/drivers/hwmon/asus_atk0110.c
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Diffstat (limited to 'drivers/hwmon/asus_atk0110.c')
-rw-r--r--drivers/hwmon/asus_atk0110.c1009
1 files changed, 1009 insertions, 0 deletions
diff --git a/drivers/hwmon/asus_atk0110.c b/drivers/hwmon/asus_atk0110.c
new file mode 100644
index 000000000000..0897edef2574
--- /dev/null
+++ b/drivers/hwmon/asus_atk0110.c
@@ -0,0 +1,1009 @@
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
351static char const *atk_sensor_type(union acpi_object *flags)
352{
353 u64 type = flags->integer.value & ATK_TYPE_MASK;
354 char const *what;
355
356 switch (type) {
357 case HWMON_TYPE_VOLT:
358 what = "voltage";
359 break;
360 case HWMON_TYPE_TEMP:
361 what = "temperature";
362 break;
363 case HWMON_TYPE_FAN:
364 what = "fan";
365 break;
366 default:
367 what = "unknown";
368 break;
369 }
370
371 return what;
372}
373
374static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
375{
376#ifdef DEBUG
377 struct device *dev = &data->acpi_dev->dev;
378 union acpi_object *flags;
379 union acpi_object *name;
380 union acpi_object *limit1;
381 union acpi_object *limit2;
382 union acpi_object *enable;
383 char const *what;
384
385 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
386 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
387 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
388 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
389 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
390
391 what = atk_sensor_type(flags);
392
393 dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what,
394 flags->integer.value,
395 name->string.pointer,
396 limit1->integer.value, limit2->integer.value,
397 enable->integer.value ? "enabled" : "disabled");
398#endif
399}
400
401static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
402{
403 struct atk_data *data = sensor->data;
404 struct device *dev = &data->acpi_dev->dev;
405 struct acpi_object_list params;
406 union acpi_object id;
407 acpi_status status;
408 acpi_handle method;
409
410 switch (sensor->type) {
411 case HWMON_TYPE_VOLT:
412 method = data->rvlt_handle;
413 break;
414 case HWMON_TYPE_TEMP:
415 method = data->rtmp_handle;
416 break;
417 case HWMON_TYPE_FAN:
418 method = data->rfan_handle;
419 break;
420 default:
421 return -EINVAL;
422 }
423
424 id.type = ACPI_TYPE_INTEGER;
425 id.integer.value = sensor->id;
426
427 params.count = 1;
428 params.pointer = &id;
429
430 status = acpi_evaluate_integer(method, NULL, &params, value);
431 if (status != AE_OK) {
432 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
433 acpi_format_exception(status));
434 return -EIO;
435 }
436
437 return 0;
438}
439
440static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
441{
442 struct atk_data *data = sensor->data;
443 struct device *dev = &data->acpi_dev->dev;
444 struct acpi_object_list params;
445 struct acpi_buffer ret;
446 union acpi_object id;
447 struct atk_acpi_buffer_u64 tmp;
448 acpi_status status;
449
450 id.type = ACPI_TYPE_INTEGER;
451 id.integer.value = sensor->id;
452
453 params.count = 1;
454 params.pointer = &id;
455
456 tmp.buf.type = ACPI_TYPE_BUFFER;
457 tmp.buf.buffer.pointer = (u8 *)&tmp.value;
458 tmp.buf.buffer.length = sizeof(u64);
459 ret.length = sizeof(tmp);
460 ret.pointer = &tmp;
461
462 status = acpi_evaluate_object_typed(data->read_handle, NULL, &params,
463 &ret, ACPI_TYPE_BUFFER);
464 if (status != AE_OK) {
465 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
466 acpi_format_exception(status));
467 return -EIO;
468 }
469
470 /* Return buffer format:
471 * [0-3] "value" is valid flag
472 * [4-7] value
473 */
474 if (!(tmp.value & 0xffffffff)) {
475 /* The reading is not valid, possible causes:
476 * - sensor failure
477 * - enumeration was FUBAR (and we didn't notice)
478 */
479 dev_info(dev, "Failure: %#llx\n", tmp.value);
480 return -EIO;
481 }
482
483 *value = (tmp.value & 0xffffffff00000000ULL) >> 32;
484
485 return 0;
486}
487
488static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
489{
490 int err;
491
492 if (!sensor->is_valid ||
493 time_after(jiffies, sensor->last_updated + CACHE_TIME)) {
494 if (sensor->data->old_interface)
495 err = atk_read_value_old(sensor, value);
496 else
497 err = atk_read_value_new(sensor, value);
498
499 sensor->is_valid = true;
500 sensor->last_updated = jiffies;
501 sensor->cached_value = *value;
502 } else {
503 *value = sensor->cached_value;
504 err = 0;
505 }
506
507 return err;
508}
509
510static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
511{
512 struct device *dev = &data->acpi_dev->dev;
513 union acpi_object *flags;
514 union acpi_object *name;
515 union acpi_object *limit1;
516 union acpi_object *limit2;
517 union acpi_object *enable;
518 struct atk_sensor_data *sensor;
519 char const *base_name;
520 char const *limit1_name;
521 char const *limit2_name;
522 u64 type;
523 int err;
524 int *num;
525 int start;
526
527 if (obj->type != ACPI_TYPE_PACKAGE) {
528 /* wft is this? */
529 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
530 obj->type);
531 return -EINVAL;
532 }
533
534 err = validate_hwmon_pack(data, obj);
535 if (err)
536 return err;
537
538 /* Ok, we have a valid hwmon package */
539 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
540 & ATK_TYPE_MASK;
541
542 switch (type) {
543 case HWMON_TYPE_VOLT:
544 base_name = "in";
545 limit1_name = "min";
546 limit2_name = "max";
547 num = &data->voltage_count;
548 start = 0;
549 break;
550 case HWMON_TYPE_TEMP:
551 base_name = "temp";
552 limit1_name = "max";
553 limit2_name = "crit";
554 num = &data->temperature_count;
555 start = 1;
556 break;
557 case HWMON_TYPE_FAN:
558 base_name = "fan";
559 limit1_name = "min";
560 limit2_name = "max";
561 num = &data->fan_count;
562 start = 1;
563 break;
564 default:
565 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
566 return -EINVAL;
567 }
568
569 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
570 if (!enable->integer.value)
571 /* sensor is disabled */
572 return 0;
573
574 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
575 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
576 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
577 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
578
579 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
580 if (!sensor)
581 return -ENOMEM;
582
583 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
584 if (!sensor->acpi_name) {
585 err = -ENOMEM;
586 goto out;
587 }
588
589 INIT_LIST_HEAD(&sensor->list);
590 sensor->type = type;
591 sensor->data = data;
592 sensor->id = flags->integer.value;
593 sensor->limit1 = limit1->integer.value;
594 sensor->limit2 = limit2->integer.value;
595
596 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
597 "%s%d_input", base_name, start + *num);
598 atk_init_attribute(&sensor->input_attr,
599 sensor->input_attr_name,
600 atk_input_show);
601
602 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
603 "%s%d_label", base_name, start + *num);
604 atk_init_attribute(&sensor->label_attr,
605 sensor->label_attr_name,
606 atk_label_show);
607
608 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
609 "%s%d_%s", base_name, start + *num, limit1_name);
610 atk_init_attribute(&sensor->limit1_attr,
611 sensor->limit1_attr_name,
612 atk_limit1_show);
613
614 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
615 "%s%d_%s", base_name, start + *num, limit2_name);
616 atk_init_attribute(&sensor->limit2_attr,
617 sensor->limit2_attr_name,
618 atk_limit2_show);
619
620 list_add(&sensor->list, &data->sensor_list);
621 (*num)++;
622
623 return 1;
624out:
625 kfree(sensor->acpi_name);
626 kfree(sensor);
627 return err;
628}
629
630static int atk_enumerate_old_hwmon(struct atk_data *data)
631{
632 struct device *dev = &data->acpi_dev->dev;
633 struct acpi_buffer buf;
634 union acpi_object *pack;
635 acpi_status status;
636 int i, ret;
637 int count = 0;
638
639 /* Voltages */
640 buf.length = ACPI_ALLOCATE_BUFFER;
641 status = acpi_evaluate_object_typed(data->atk_handle,
642 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
643 if (status != AE_OK) {
644 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
645 acpi_format_exception(status));
646
647 return -ENODEV;
648 }
649
650 pack = buf.pointer;
651 for (i = 1; i < pack->package.count; i++) {
652 union acpi_object *obj = &pack->package.elements[i];
653
654 ret = atk_add_sensor(data, obj);
655 if (ret > 0)
656 count++;
657 }
658 ACPI_FREE(buf.pointer);
659
660 /* Temperatures */
661 buf.length = ACPI_ALLOCATE_BUFFER;
662 status = acpi_evaluate_object_typed(data->atk_handle,
663 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
664 if (status != AE_OK) {
665 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
666 acpi_format_exception(status));
667
668 ret = -ENODEV;
669 goto cleanup;
670 }
671
672 pack = buf.pointer;
673 for (i = 1; i < pack->package.count; i++) {
674 union acpi_object *obj = &pack->package.elements[i];
675
676 ret = atk_add_sensor(data, obj);
677 if (ret > 0)
678 count++;
679 }
680 ACPI_FREE(buf.pointer);
681
682 /* Fans */
683 buf.length = ACPI_ALLOCATE_BUFFER;
684 status = acpi_evaluate_object_typed(data->atk_handle,
685 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
686 if (status != AE_OK) {
687 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
688 acpi_format_exception(status));
689
690 ret = -ENODEV;
691 goto cleanup;
692 }
693
694 pack = buf.pointer;
695 for (i = 1; i < pack->package.count; i++) {
696 union acpi_object *obj = &pack->package.elements[i];
697
698 ret = atk_add_sensor(data, obj);
699 if (ret > 0)
700 count++;
701 }
702 ACPI_FREE(buf.pointer);
703
704 return count;
705cleanup:
706 atk_free_sensors(data);
707 return ret;
708}
709
710static int atk_enumerate_new_hwmon(struct atk_data *data)
711{
712 struct device *dev = &data->acpi_dev->dev;
713 struct acpi_buffer buf;
714 acpi_status ret;
715 struct acpi_object_list params;
716 union acpi_object id;
717 union acpi_object *pack;
718 int err;
719 int i;
720
721 dev_dbg(dev, "Enumerating hwmon sensors\n");
722
723 id.type = ACPI_TYPE_INTEGER;
724 id.integer.value = ATK_MUX_HWMON;
725 params.count = 1;
726 params.pointer = &id;
727
728 buf.length = ACPI_ALLOCATE_BUFFER;
729 ret = acpi_evaluate_object_typed(data->enumerate_handle, NULL, &params,
730 &buf, ACPI_TYPE_PACKAGE);
731 if (ret != AE_OK) {
732 dev_warn(dev, METHOD_ENUMERATE ": ACPI exception: %s\n",
733 acpi_format_exception(ret));
734 return -ENODEV;
735 }
736
737 /* Result must be a package */
738 pack = buf.pointer;
739
740 if (pack->package.count < 1) {
741 dev_dbg(dev, "%s: hwmon package is too small: %d\n", __func__,
742 pack->package.count);
743 err = -EINVAL;
744 goto out;
745 }
746
747 for (i = 0; i < pack->package.count; i++) {
748 union acpi_object *obj = &pack->package.elements[i];
749
750 atk_add_sensor(data, obj);
751 }
752
753 err = data->voltage_count + data->temperature_count + data->fan_count;
754
755out:
756 ACPI_FREE(buf.pointer);
757 return err;
758}
759
760static int atk_create_files(struct atk_data *data)
761{
762 struct atk_sensor_data *s;
763 int err;
764
765 list_for_each_entry(s, &data->sensor_list, list) {
766 err = device_create_file(data->hwmon_dev, &s->input_attr);
767 if (err)
768 return err;
769 err = device_create_file(data->hwmon_dev, &s->label_attr);
770 if (err)
771 return err;
772 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
773 if (err)
774 return err;
775 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
776 if (err)
777 return err;
778 }
779
780 err = device_create_file(data->hwmon_dev, &atk_name_attr);
781
782 return err;
783}
784
785static void atk_remove_files(struct atk_data *data)
786{
787 struct atk_sensor_data *s;
788
789 list_for_each_entry(s, &data->sensor_list, list) {
790 device_remove_file(data->hwmon_dev, &s->input_attr);
791 device_remove_file(data->hwmon_dev, &s->label_attr);
792 device_remove_file(data->hwmon_dev, &s->limit1_attr);
793 device_remove_file(data->hwmon_dev, &s->limit2_attr);
794 }
795 device_remove_file(data->hwmon_dev, &atk_name_attr);
796}
797
798static void atk_free_sensors(struct atk_data *data)
799{
800 struct list_head *head = &data->sensor_list;
801 struct atk_sensor_data *s, *tmp;
802
803 list_for_each_entry_safe(s, tmp, head, list) {
804 kfree(s->acpi_name);
805 kfree(s);
806 }
807}
808
809static int atk_register_hwmon(struct atk_data *data)
810{
811 struct device *dev = &data->acpi_dev->dev;
812 int err;
813
814 dev_dbg(dev, "registering hwmon device\n");
815 data->hwmon_dev = hwmon_device_register(dev);
816 if (IS_ERR(data->hwmon_dev))
817 return PTR_ERR(data->hwmon_dev);
818
819 dev_dbg(dev, "populating sysfs directory\n");
820 err = atk_create_files(data);
821 if (err)
822 goto remove;
823
824 return 0;
825remove:
826 /* Cleanup the registered files */
827 atk_remove_files(data);
828 hwmon_device_unregister(data->hwmon_dev);
829 return err;
830}
831
832static int atk_check_old_if(struct atk_data *data)
833{
834 struct device *dev = &data->acpi_dev->dev;
835 acpi_handle ret;
836 acpi_status status;
837
838 /* RTMP: read temperature */
839 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
840 if (status != AE_OK) {
841 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
842 acpi_format_exception(status));
843 return -ENODEV;
844 }
845 data->rtmp_handle = ret;
846
847 /* RVLT: read voltage */
848 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
849 if (status != AE_OK) {
850 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
851 acpi_format_exception(status));
852 return -ENODEV;
853 }
854 data->rvlt_handle = ret;
855
856 /* RFAN: read fan status */
857 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
858 if (status != AE_OK) {
859 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
860 acpi_format_exception(status));
861 return -ENODEV;
862 }
863 data->rfan_handle = ret;
864
865 return 0;
866}
867
868static int atk_check_new_if(struct atk_data *data)
869{
870 struct device *dev = &data->acpi_dev->dev;
871 acpi_handle ret;
872 acpi_status status;
873
874 /* Enumeration */
875 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
876 if (status != AE_OK) {
877 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
878 acpi_format_exception(status));
879 return -ENODEV;
880 }
881 data->enumerate_handle = ret;
882
883 /* De-multiplexer (read) */
884 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
885 if (status != AE_OK) {
886 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
887 acpi_format_exception(status));
888 return -ENODEV;
889 }
890 data->read_handle = ret;
891
892 return 0;
893}
894
895static int atk_add(struct acpi_device *device)
896{
897 acpi_status ret;
898 int err;
899 struct acpi_buffer buf;
900 union acpi_object *obj;
901 struct atk_data *data;
902
903 dev_dbg(&device->dev, "adding...\n");
904
905 data = kzalloc(sizeof(*data), GFP_KERNEL);
906 if (!data)
907 return -ENOMEM;
908
909 data->acpi_dev = device;
910 data->atk_handle = device->handle;
911 INIT_LIST_HEAD(&data->sensor_list);
912
913 buf.length = ACPI_ALLOCATE_BUFFER;
914 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
915 &buf, ACPI_TYPE_PACKAGE);
916 if (ret != AE_OK) {
917 dev_dbg(&device->dev, "atk: method MBIF not found\n");
918 err = -ENODEV;
919 goto out;
920 }
921
922 obj = buf.pointer;
923 if (obj->package.count >= 2 &&
924 obj->package.elements[1].type == ACPI_TYPE_STRING) {
925 dev_dbg(&device->dev, "board ID = %s\n",
926 obj->package.elements[1].string.pointer);
927 }
928 ACPI_FREE(buf.pointer);
929
930 /* Check for hwmon methods: first check "old" style methods; note that
931 * both may be present: in this case we stick to the old interface;
932 * analysis of multiple DSDTs indicates that when both interfaces
933 * are present the new one (GGRP/GITM) is not functional.
934 */
935 err = atk_check_old_if(data);
936 if (!err) {
937 dev_dbg(&device->dev, "Using old hwmon interface\n");
938 data->old_interface = true;
939 } else {
940 err = atk_check_new_if(data);
941 if (err)
942 goto out;
943
944 dev_dbg(&device->dev, "Using new hwmon interface\n");
945 data->old_interface = false;
946 }
947
948 if (data->old_interface)
949 err = atk_enumerate_old_hwmon(data);
950 else
951 err = atk_enumerate_new_hwmon(data);
952 if (err < 0)
953 goto out;
954 if (err == 0) {
955 dev_info(&device->dev,
956 "No usable sensor detected, bailing out\n");
957 err = -ENODEV;
958 goto out;
959 }
960
961 err = atk_register_hwmon(data);
962 if (err)
963 goto cleanup;
964
965 device->driver_data = data;
966 return 0;
967cleanup:
968 atk_free_sensors(data);
969out:
970 kfree(data);
971 return err;
972}
973
974static int atk_remove(struct acpi_device *device, int type)
975{
976 struct atk_data *data = device->driver_data;
977 dev_dbg(&device->dev, "removing...\n");
978
979 device->driver_data = NULL;
980
981 atk_remove_files(data);
982 atk_free_sensors(data);
983 hwmon_device_unregister(data->hwmon_dev);
984
985 kfree(data);
986
987 return 0;
988}
989
990static int __init atk0110_init(void)
991{
992 int ret;
993
994 ret = acpi_bus_register_driver(&atk_driver);
995 if (ret)
996 pr_info("atk: acpi_bus_register_driver failed: %d\n", ret);
997
998 return ret;
999}
1000
1001static void __exit atk0110_exit(void)
1002{
1003 acpi_bus_unregister_driver(&atk_driver);
1004}
1005
1006module_init(atk0110_init);
1007module_exit(atk0110_exit);
1008
1009MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-13 03:50:56 -0500