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hwmon: (asus_atk0110) Refactor the code
[linux-2.6-block.git] / drivers / hwmon / asus_atk0110.c
CommitLineData
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
18e25555
LT		 132/* Return buffer format:
133 * [0-3] "value" is valid flag
134 * [4-7] value
135 * [8- ] unknown stuff on newer mobos
136 */
137struct atk_acpi_ret_buffer {
138 u32 flags;
139 u32 value;
140 u8 data[];
141};
142
143/* Input buffer used for GITM and SITM methods */
144struct atk_acpi_input_buf {
145 u32 id;
146 u32 param1;
147 u32 param2;
2c03d07a
LT		 148};
149
150static int atk_add(struct acpi_device *device);
151static int atk_remove(struct acpi_device *device, int type);
152static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
153static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
154static void atk_free_sensors(struct atk_data *data);
155
156static struct acpi_driver atk_driver = {
157 .name = ATK_HID,
158 .class = "hwmon",
159 .ids = atk_ids,
160 .ops = {
161 .add = atk_add,
162 .remove = atk_remove,
163 },
164};
165
166#define input_to_atk_sensor(attr) \
167 container_of(attr, struct atk_sensor_data, input_attr)
168
169#define label_to_atk_sensor(attr) \
170 container_of(attr, struct atk_sensor_data, label_attr)
171
172#define limit1_to_atk_sensor(attr) \
173 container_of(attr, struct atk_sensor_data, limit1_attr)
174
175#define limit2_to_atk_sensor(attr) \
176 container_of(attr, struct atk_sensor_data, limit2_attr)
177
178static ssize_t atk_input_show(struct device *dev,
179 struct device_attribute *attr, char *buf)
180{
181 struct atk_sensor_data *s = input_to_atk_sensor(attr);
182 u64 value;
183 int err;
184
185 err = atk_read_value(s, &value);
186 if (err)
187 return err;
188
189 if (s->type == HWMON_TYPE_TEMP)
190 /* ACPI returns decidegree */
191 value *= 100;
192
193 return sprintf(buf, "%llu\n", value);
194}
195
196static ssize_t atk_label_show(struct device *dev,
197 struct device_attribute *attr, char *buf)
198{
199 struct atk_sensor_data *s = label_to_atk_sensor(attr);
200
201 return sprintf(buf, "%s\n", s->acpi_name);
202}
203
204static ssize_t atk_limit1_show(struct device *dev,
205 struct device_attribute *attr, char *buf)
206{
207 struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
208 u64 value = s->limit1;
209
210 if (s->type == HWMON_TYPE_TEMP)
211 value *= 100;
212
213 return sprintf(buf, "%lld\n", value);
214}
215
216static ssize_t atk_limit2_show(struct device *dev,
217 struct device_attribute *attr, char *buf)
218{
219 struct atk_sensor_data *s = limit2_to_atk_sensor(attr);
220 u64 value = s->limit2;
221
222 if (s->type == HWMON_TYPE_TEMP)
223 value *= 100;
224
225 return sprintf(buf, "%lld\n", value);
226}
227
228static ssize_t atk_name_show(struct device *dev,
229 struct device_attribute *attr, char *buf)
230{
231 return sprintf(buf, "atk0110\n");
232}
233static struct device_attribute atk_name_attr =
234 __ATTR(name, 0444, atk_name_show, NULL);
235
236static void atk_init_attribute(struct device_attribute *attr, char *name,
237 sysfs_show_func show)
238{
239 attr->attr.name = name;
240 attr->attr.mode = 0444;
241 attr->show = show;
242 attr->store = NULL;
243}
244
245
246static union acpi_object *atk_get_pack_member(struct atk_data *data,
247 union acpi_object *pack,
248 enum atk_pack_member m)
249{
250 bool old_if = data->old_interface;
251 int offset;
252
253 switch (m) {
254 case HWMON_PACK_FLAGS:
255 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS;
256 break;
257 case HWMON_PACK_NAME:
258 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME;
259 break;
260 case HWMON_PACK_LIMIT1:
261 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 :
262 _HWMON_NEW_PACK_LIMIT1;
263 break;
264 case HWMON_PACK_LIMIT2:
265 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 :
266 _HWMON_NEW_PACK_LIMIT2;
267 break;
268 case HWMON_PACK_ENABLE:
269 offset = old_if ? _HWMON_OLD_PACK_ENABLE :
270 _HWMON_NEW_PACK_ENABLE;
271 break;
272 default:
273 return NULL;
274 }
275
276 return &pack->package.elements[offset];
277}
278
279
280/* New package format is:
281 * - flag (int)
282 * class - used for de-muxing the request to the correct GITn
283 * type (volt, temp, fan)
284 * sensor id |
285 * sensor id - used for de-muxing the request _inside_ the GITn
286 * - name (str)
287 * - unknown (int)
288 * - unknown (int)
289 * - limit1 (int)
290 * - limit2 (int)
291 * - enable (int)
292 *
293 * The old package has the same format but it's missing the two unknown fields.
294 */
295static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj)
296{
297 struct device *dev = &data->acpi_dev->dev;
298 union acpi_object *tmp;
299 bool old_if = data->old_interface;
300 int const expected_size = old_if ? _HWMON_OLD_PACK_SIZE :
301 _HWMON_NEW_PACK_SIZE;
302
303 if (obj->type != ACPI_TYPE_PACKAGE) {
304 dev_warn(dev, "Invalid type: %d\n", obj->type);
305 return -EINVAL;
306 }
307
308 if (obj->package.count != expected_size) {
309 dev_warn(dev, "Invalid package size: %d, expected: %d\n",
310 obj->package.count, expected_size);
311 return -EINVAL;
312 }
313
314 tmp = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
315 if (tmp->type != ACPI_TYPE_INTEGER) {
316 dev_warn(dev, "Invalid type (flag): %d\n", tmp->type);
317 return -EINVAL;
318 }
319
320 tmp = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
321 if (tmp->type != ACPI_TYPE_STRING) {
322 dev_warn(dev, "Invalid type (name): %d\n", tmp->type);
323 return -EINVAL;
324 }
325
326 /* Don't check... we don't know what they're useful for anyway */
327#if 0
328 tmp = &obj->package.elements[HWMON_PACK_UNK1];
329 if (tmp->type != ACPI_TYPE_INTEGER) {
330 dev_warn(dev, "Invalid type (unk1): %d\n", tmp->type);
331 return -EINVAL;
332 }
333
334 tmp = &obj->package.elements[HWMON_PACK_UNK2];
335 if (tmp->type != ACPI_TYPE_INTEGER) {
336 dev_warn(dev, "Invalid type (unk2): %d\n", tmp->type);
337 return -EINVAL;
338 }
339#endif
340
341 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
342 if (tmp->type != ACPI_TYPE_INTEGER) {
343 dev_warn(dev, "Invalid type (limit1): %d\n", tmp->type);
344 return -EINVAL;
345 }
346
347 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
348 if (tmp->type != ACPI_TYPE_INTEGER) {
349 dev_warn(dev, "Invalid type (limit2): %d\n", tmp->type);
350 return -EINVAL;
351 }
352
353 tmp = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
354 if (tmp->type != ACPI_TYPE_INTEGER) {
355 dev_warn(dev, "Invalid type (enable): %d\n", tmp->type);
356 return -EINVAL;
357 }
358
359 atk_print_sensor(data, obj);
360
361 return 0;
362}
363
b9008708 364#ifdef DEBUG
2c03d07a
LT		 365static char const *atk_sensor_type(union acpi_object *flags)
366{
367 u64 type = flags->integer.value & ATK_TYPE_MASK;
368 char const *what;
369
370 switch (type) {
371 case HWMON_TYPE_VOLT:
372 what = "voltage";
373 break;
374 case HWMON_TYPE_TEMP:
375 what = "temperature";
376 break;
377 case HWMON_TYPE_FAN:
378 what = "fan";
379 break;
380 default:
381 what = "unknown";
382 break;
383 }
384
385 return what;
386}
b9008708 387#endif
2c03d07a
LT		 388
389static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
390{
391#ifdef DEBUG
392 struct device *dev = &data->acpi_dev->dev;
393 union acpi_object *flags;
394 union acpi_object *name;
395 union acpi_object *limit1;
396 union acpi_object *limit2;
397 union acpi_object *enable;
398 char const *what;
399
400 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
401 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
402 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
403 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
404 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
405
406 what = atk_sensor_type(flags);
407
408 dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what,
409 flags->integer.value,
410 name->string.pointer,
411 limit1->integer.value, limit2->integer.value,
412 enable->integer.value ? "enabled" : "disabled");
413#endif
414}
415
416static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
417{
418 struct atk_data *data = sensor->data;
419 struct device *dev = &data->acpi_dev->dev;
420 struct acpi_object_list params;
421 union acpi_object id;
422 acpi_status status;
423 acpi_handle method;
424
425 switch (sensor->type) {
426 case HWMON_TYPE_VOLT:
427 method = data->rvlt_handle;
428 break;
429 case HWMON_TYPE_TEMP:
430 method = data->rtmp_handle;
431 break;
432 case HWMON_TYPE_FAN:
433 method = data->rfan_handle;
434 break;
435 default:
436 return -EINVAL;
437 }
438
439 id.type = ACPI_TYPE_INTEGER;
440 id.integer.value = sensor->id;
441
442 params.count = 1;
443 params.pointer = &id;
444
445 status = acpi_evaluate_integer(method, NULL, &params, value);
446 if (status != AE_OK) {
447 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
448 acpi_format_exception(status));
449 return -EIO;
450 }
451
452 return 0;
453}
454
18e25555 455static union acpi_object *atk_ggrp(struct atk_data *data, u16 mux)
2c03d07a 456{
2c03d07a 457 struct device *dev = &data->acpi_dev->dev;
18e25555
LT		 458 struct acpi_buffer buf;
459 acpi_status ret;
2c03d07a 460 struct acpi_object_list params;
2c03d07a 461 union acpi_object id;
18e25555 462 union acpi_object *pack;
2c03d07a
LT		 463
464 id.type = ACPI_TYPE_INTEGER;
18e25555 465 id.integer.value = mux;
2c03d07a
LT		 466 params.count = 1;
467 params.pointer = &id;
468
18e25555
LT		 469 buf.length = ACPI_ALLOCATE_BUFFER;
470 ret = acpi_evaluate_object(data->enumerate_handle, NULL, &params, &buf);
471 if (ret != AE_OK) {
472 dev_err(dev, "GGRP[%#x] ACPI exception: %s\n", mux,
473 acpi_format_exception(ret));
474 return ERR_PTR(-EIO);
475 }
476 pack = buf.pointer;
477 if (pack->type != ACPI_TYPE_PACKAGE) {
478 /* Execution was successful, but the id was not found */
479 ACPI_FREE(pack);
480 return ERR_PTR(-ENOENT);
481 }
482
483 if (pack->package.count < 1) {
484 dev_err(dev, "GGRP[%#x] package is too small\n", mux);
485 ACPI_FREE(pack);
486 return ERR_PTR(-EIO);
487 }
488 return pack;
489}
2c03d07a 490
18e25555
LT		 491static union acpi_object *atk_gitm(struct atk_data *data, u64 id)
492{
493 struct device *dev = &data->acpi_dev->dev;
494 struct atk_acpi_input_buf buf;
495 union acpi_object tmp;
496 struct acpi_object_list params;
497 struct acpi_buffer ret;
498 union acpi_object *obj;
499 acpi_status status;
500
501 buf.id = id;
502 buf.param1 = 0;
503 buf.param2 = 0;
504
505 tmp.type = ACPI_TYPE_BUFFER;
506 tmp.buffer.pointer = (u8 *)&buf;
507 tmp.buffer.length = sizeof(buf);
508
509 params.count = 1;
510 params.pointer = (void *)&tmp;
511
512 ret.length = ACPI_ALLOCATE_BUFFER;
2c03d07a
LT		 513 status = acpi_evaluate_object_typed(data->read_handle, NULL, &params,
514 &ret, ACPI_TYPE_BUFFER);
515 if (status != AE_OK) {
18e25555 516 dev_warn(dev, "GITM[%#llx] ACPI exception: %s\n", id,
2c03d07a 517 acpi_format_exception(status));
18e25555 518 return ERR_PTR(-EIO);
2c03d07a 519 }
18e25555
LT		 520 obj = ret.pointer;
521
522 /* Sanity check */
523 if (obj->buffer.length < 8) {
524 dev_warn(dev, "Unexpected ASBF length: %u\n",
525 obj->buffer.length);
526 ACPI_FREE(obj);
527 return ERR_PTR(-EIO);
528 }
529 return obj;
530}
2c03d07a 531
18e25555
LT		 532static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
533{
534 struct atk_data *data = sensor->data;
535 struct device *dev = &data->acpi_dev->dev;
536 union acpi_object *obj;
537 struct atk_acpi_ret_buffer *buf;
538 int err = 0;
539
540 obj = atk_gitm(data, sensor->id);
541 if (IS_ERR(obj))
542 return PTR_ERR(obj);
543
544 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
545 if (buf->flags == 0) {
2c03d07a
LT		 546 /* The reading is not valid, possible causes:
547 * - sensor failure
548 * - enumeration was FUBAR (and we didn't notice)
549 */
18e25555
LT		 550 dev_warn(dev, "Read failed, sensor = %#llx\n", sensor->id);
551 err = -EIO;
552 goto out;
2c03d07a
LT		 553 }
554
18e25555
LT		 555 *value = buf->value;
556out:
557 ACPI_FREE(obj);
558 return err;
2c03d07a
LT		 559}
560
561static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
562{
563 int err;
564
565 if (!sensor->is_valid ||
566 time_after(jiffies, sensor->last_updated + CACHE_TIME)) {
567 if (sensor->data->old_interface)
568 err = atk_read_value_old(sensor, value);
569 else
570 err = atk_read_value_new(sensor, value);
571
572 sensor->is_valid = true;
573 sensor->last_updated = jiffies;
574 sensor->cached_value = *value;
575 } else {
576 *value = sensor->cached_value;
577 err = 0;
578 }
579
580 return err;
581}
582
583static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
584{
585 struct device *dev = &data->acpi_dev->dev;
586 union acpi_object *flags;
587 union acpi_object *name;
588 union acpi_object *limit1;
589 union acpi_object *limit2;
590 union acpi_object *enable;
591 struct atk_sensor_data *sensor;
592 char const *base_name;
593 char const *limit1_name;
594 char const *limit2_name;
595 u64 type;
596 int err;
597 int *num;
598 int start;
599
600 if (obj->type != ACPI_TYPE_PACKAGE) {
601 /* wft is this? */
602 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
603 obj->type);
604 return -EINVAL;
605 }
606
607 err = validate_hwmon_pack(data, obj);
608 if (err)
609 return err;
610
611 /* Ok, we have a valid hwmon package */
612 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
613 & ATK_TYPE_MASK;
614
615 switch (type) {
616 case HWMON_TYPE_VOLT:
617 base_name = "in";
618 limit1_name = "min";
619 limit2_name = "max";
620 num = &data->voltage_count;
621 start = 0;
622 break;
623 case HWMON_TYPE_TEMP:
624 base_name = "temp";
625 limit1_name = "max";
626 limit2_name = "crit";
627 num = &data->temperature_count;
628 start = 1;
629 break;
630 case HWMON_TYPE_FAN:
631 base_name = "fan";
632 limit1_name = "min";
633 limit2_name = "max";
634 num = &data->fan_count;
635 start = 1;
636 break;
637 default:
638 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
639 return -EINVAL;
640 }
641
642 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
643 if (!enable->integer.value)
644 /* sensor is disabled */
645 return 0;
646
647 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
648 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
649 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
650 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
651
652 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
653 if (!sensor)
654 return -ENOMEM;
655
656 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
657 if (!sensor->acpi_name) {
658 err = -ENOMEM;
659 goto out;
660 }
661
662 INIT_LIST_HEAD(&sensor->list);
663 sensor->type = type;
664 sensor->data = data;
665 sensor->id = flags->integer.value;
666 sensor->limit1 = limit1->integer.value;
8d282497
LT		 667 if (data->old_interface)
668 sensor->limit2 = limit2->integer.value;
669 else
670 /* The upper limit is expressed as delta from lower limit */
671 sensor->limit2 = sensor->limit1 + limit2->integer.value;
2c03d07a
LT		 672
673 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
674 "%s%d_input", base_name, start + *num);
675 atk_init_attribute(&sensor->input_attr,
676 sensor->input_attr_name,
677 atk_input_show);
678
679 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
680 "%s%d_label", base_name, start + *num);
681 atk_init_attribute(&sensor->label_attr,
682 sensor->label_attr_name,
683 atk_label_show);
684
685 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
686 "%s%d_%s", base_name, start + *num, limit1_name);
687 atk_init_attribute(&sensor->limit1_attr,
688 sensor->limit1_attr_name,
689 atk_limit1_show);
690
691 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
692 "%s%d_%s", base_name, start + *num, limit2_name);
693 atk_init_attribute(&sensor->limit2_attr,
694 sensor->limit2_attr_name,
695 atk_limit2_show);
696
697 list_add(&sensor->list, &data->sensor_list);
698 (*num)++;
699
700 return 1;
701out:
702 kfree(sensor->acpi_name);
703 kfree(sensor);
704 return err;
705}
706
707static int atk_enumerate_old_hwmon(struct atk_data *data)
708{
709 struct device *dev = &data->acpi_dev->dev;
710 struct acpi_buffer buf;
711 union acpi_object *pack;
712 acpi_status status;
713 int i, ret;
714 int count = 0;
715
716 /* Voltages */
717 buf.length = ACPI_ALLOCATE_BUFFER;
718 status = acpi_evaluate_object_typed(data->atk_handle,
719 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
720 if (status != AE_OK) {
721 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
722 acpi_format_exception(status));
723
724 return -ENODEV;
725 }
726
727 pack = buf.pointer;
728 for (i = 1; i < pack->package.count; i++) {
729 union acpi_object *obj = &pack->package.elements[i];
730
731 ret = atk_add_sensor(data, obj);
732 if (ret > 0)
733 count++;
734 }
735 ACPI_FREE(buf.pointer);
736
737 /* Temperatures */
738 buf.length = ACPI_ALLOCATE_BUFFER;
739 status = acpi_evaluate_object_typed(data->atk_handle,
740 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
741 if (status != AE_OK) {
742 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
743 acpi_format_exception(status));
744
745 ret = -ENODEV;
746 goto cleanup;
747 }
748
749 pack = buf.pointer;
750 for (i = 1; i < pack->package.count; i++) {
751 union acpi_object *obj = &pack->package.elements[i];
752
753 ret = atk_add_sensor(data, obj);
754 if (ret > 0)
755 count++;
756 }
757 ACPI_FREE(buf.pointer);
758
759 /* Fans */
760 buf.length = ACPI_ALLOCATE_BUFFER;
761 status = acpi_evaluate_object_typed(data->atk_handle,
762 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
763 if (status != AE_OK) {
764 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
765 acpi_format_exception(status));
766
767 ret = -ENODEV;
768 goto cleanup;
769 }
770
771 pack = buf.pointer;
772 for (i = 1; i < pack->package.count; i++) {
773 union acpi_object *obj = &pack->package.elements[i];
774
775 ret = atk_add_sensor(data, obj);
776 if (ret > 0)
777 count++;
778 }
779 ACPI_FREE(buf.pointer);
780
781 return count;
782cleanup:
783 atk_free_sensors(data);
784 return ret;
785}
786
787static int atk_enumerate_new_hwmon(struct atk_data *data)
788{
789 struct device *dev = &data->acpi_dev->dev;
2c03d07a
LT		 790 union acpi_object *pack;
791 int err;
792 int i;
793
794 dev_dbg(dev, "Enumerating hwmon sensors\n");
795
18e25555
LT		 796 pack = atk_ggrp(data, ATK_MUX_HWMON);
797 if (IS_ERR(pack))
798 return PTR_ERR(pack);
2c03d07a
LT		 799
800 for (i = 0; i < pack->package.count; i++) {
801 union acpi_object *obj = &pack->package.elements[i];
802
803 atk_add_sensor(data, obj);
804 }
805
806 err = data->voltage_count + data->temperature_count + data->fan_count;
807
18e25555 808 ACPI_FREE(pack);
2c03d07a
LT		 809 return err;
810}
811
812static int atk_create_files(struct atk_data *data)
813{
814 struct atk_sensor_data *s;
815 int err;
816
817 list_for_each_entry(s, &data->sensor_list, list) {
818 err = device_create_file(data->hwmon_dev, &s->input_attr);
819 if (err)
820 return err;
821 err = device_create_file(data->hwmon_dev, &s->label_attr);
822 if (err)
823 return err;
824 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
825 if (err)
826 return err;
827 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
828 if (err)
829 return err;
830 }
831
832 err = device_create_file(data->hwmon_dev, &atk_name_attr);
833
834 return err;
835}
836
837static void atk_remove_files(struct atk_data *data)
838{
839 struct atk_sensor_data *s;
840
841 list_for_each_entry(s, &data->sensor_list, list) {
842 device_remove_file(data->hwmon_dev, &s->input_attr);
843 device_remove_file(data->hwmon_dev, &s->label_attr);
844 device_remove_file(data->hwmon_dev, &s->limit1_attr);
845 device_remove_file(data->hwmon_dev, &s->limit2_attr);
846 }
847 device_remove_file(data->hwmon_dev, &atk_name_attr);
848}
849
850static void atk_free_sensors(struct atk_data *data)
851{
852 struct list_head *head = &data->sensor_list;
853 struct atk_sensor_data *s, *tmp;
854
855 list_for_each_entry_safe(s, tmp, head, list) {
856 kfree(s->acpi_name);
857 kfree(s);
858 }
859}
860
861static int atk_register_hwmon(struct atk_data *data)
862{
863 struct device *dev = &data->acpi_dev->dev;
864 int err;
865
866 dev_dbg(dev, "registering hwmon device\n");
867 data->hwmon_dev = hwmon_device_register(dev);
868 if (IS_ERR(data->hwmon_dev))
869 return PTR_ERR(data->hwmon_dev);
870
871 dev_dbg(dev, "populating sysfs directory\n");
872 err = atk_create_files(data);
873 if (err)
874 goto remove;
875
876 return 0;
877remove:
878 /* Cleanup the registered files */
879 atk_remove_files(data);
880 hwmon_device_unregister(data->hwmon_dev);
881 return err;
882}
883
884static int atk_check_old_if(struct atk_data *data)
885{
886 struct device *dev = &data->acpi_dev->dev;
887 acpi_handle ret;
888 acpi_status status;
889
890 /* RTMP: read temperature */
891 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
892 if (status != AE_OK) {
893 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
894 acpi_format_exception(status));
895 return -ENODEV;
896 }
897 data->rtmp_handle = ret;
898
899 /* RVLT: read voltage */
900 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
901 if (status != AE_OK) {
902 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
903 acpi_format_exception(status));
904 return -ENODEV;
905 }
906 data->rvlt_handle = ret;
907
908 /* RFAN: read fan status */
909 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
910 if (status != AE_OK) {
911 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
912 acpi_format_exception(status));
913 return -ENODEV;
914 }
915 data->rfan_handle = ret;
916
917 return 0;
918}
919
920static int atk_check_new_if(struct atk_data *data)
921{
922 struct device *dev = &data->acpi_dev->dev;
923 acpi_handle ret;
924 acpi_status status;
925
926 /* Enumeration */
927 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
928 if (status != AE_OK) {
929 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
930 acpi_format_exception(status));
931 return -ENODEV;
932 }
933 data->enumerate_handle = ret;
934
935 /* De-multiplexer (read) */
936 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
937 if (status != AE_OK) {
938 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
939 acpi_format_exception(status));
940 return -ENODEV;
941 }
942 data->read_handle = ret;
943
944 return 0;
945}
946
947static int atk_add(struct acpi_device *device)
948{
949 acpi_status ret;
950 int err;
951 struct acpi_buffer buf;
952 union acpi_object *obj;
953 struct atk_data *data;
954
955 dev_dbg(&device->dev, "adding...\n");
956
957 data = kzalloc(sizeof(*data), GFP_KERNEL);
958 if (!data)
959 return -ENOMEM;
960
961 data->acpi_dev = device;
962 data->atk_handle = device->handle;
963 INIT_LIST_HEAD(&data->sensor_list);
964
965 buf.length = ACPI_ALLOCATE_BUFFER;
966 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
967 &buf, ACPI_TYPE_PACKAGE);
968 if (ret != AE_OK) {
969 dev_dbg(&device->dev, "atk: method MBIF not found\n");
970 err = -ENODEV;
971 goto out;
972 }
973
974 obj = buf.pointer;
975 if (obj->package.count >= 2 &&
976 obj->package.elements[1].type == ACPI_TYPE_STRING) {
977 dev_dbg(&device->dev, "board ID = %s\n",
978 obj->package.elements[1].string.pointer);
979 }
980 ACPI_FREE(buf.pointer);
981
982 /* Check for hwmon methods: first check "old" style methods; note that
983 * both may be present: in this case we stick to the old interface;
984 * analysis of multiple DSDTs indicates that when both interfaces
985 * are present the new one (GGRP/GITM) is not functional.
986 */
987 err = atk_check_old_if(data);
988 if (!err) {
989 dev_dbg(&device->dev, "Using old hwmon interface\n");
990 data->old_interface = true;
991 } else {
992 err = atk_check_new_if(data);
993 if (err)
994 goto out;
995
996 dev_dbg(&device->dev, "Using new hwmon interface\n");
997 data->old_interface = false;
998 }
999
1000 if (data->old_interface)
1001 err = atk_enumerate_old_hwmon(data);
1002 else
1003 err = atk_enumerate_new_hwmon(data);
1004 if (err < 0)
1005 goto out;
1006 if (err == 0) {
1007 dev_info(&device->dev,
1008 "No usable sensor detected, bailing out\n");
1009 err = -ENODEV;
1010 goto out;
1011 }
1012
1013 err = atk_register_hwmon(data);
1014 if (err)
1015 goto cleanup;
1016
1017 device->driver_data = data;
1018 return 0;
1019cleanup:
1020 atk_free_sensors(data);
1021out:
1022 kfree(data);
1023 return err;
1024}
1025
1026static int atk_remove(struct acpi_device *device, int type)
1027{
1028 struct atk_data *data = device->driver_data;
1029 dev_dbg(&device->dev, "removing...\n");
1030
1031 device->driver_data = NULL;
1032
1033 atk_remove_files(data);
1034 atk_free_sensors(data);
1035 hwmon_device_unregister(data->hwmon_dev);
1036
1037 kfree(data);
1038
1039 return 0;
1040}
1041
1042static int __init atk0110_init(void)
1043{
1044 int ret;
1045
1046 ret = acpi_bus_register_driver(&atk_driver);
1047 if (ret)
1048 pr_info("atk: acpi_bus_register_driver failed: %d\n", ret);
1049
1050 return ret;
1051}
1052
1053static void __exit atk0110_exit(void)
1054{
1055 acpi_bus_unregister_driver(&atk_driver);
1056}
1057
1058module_init(atk0110_init);
1059module_exit(atk0110_exit);
1060
1061MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)