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i915: Fix spurious TV detection after 9d0498a2bf + 9559fcdbff
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / hwmon / asus_atk0110.c
blob653db1bda9348ebaa62d8f17f93c46a4b8cdadda
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/debugfs.h>
9 #include <linux/kernel.h>
10 #include <linux/hwmon.h>
11 #include <linux/list.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14
15 #include <acpi/acpi.h>
16 #include <acpi/acpixf.h>
17 #include <acpi/acpi_drivers.h>
18 #include <acpi/acpi_bus.h>
19
20
21 #define ATK_HID "ATK0110"
22
23 /* Minimum time between readings, enforced in order to avoid
24 * hogging the CPU.
25 */
26 #define CACHE_TIME HZ
27
28 #define BOARD_ID "MBIF"
29 #define METHOD_ENUMERATE "GGRP"
30 #define METHOD_READ "GITM"
31 #define METHOD_WRITE "SITM"
32 #define METHOD_OLD_READ_TMP "RTMP"
33 #define METHOD_OLD_READ_VLT "RVLT"
34 #define METHOD_OLD_READ_FAN "RFAN"
35 #define METHOD_OLD_ENUM_TMP "TSIF"
36 #define METHOD_OLD_ENUM_VLT "VSIF"
37 #define METHOD_OLD_ENUM_FAN "FSIF"
38
39 #define ATK_MUX_HWMON 0x00000006ULL
40 #define ATK_MUX_MGMT 0x00000011ULL
41
42 #define ATK_CLASS_MASK 0xff000000ULL
43 #define ATK_CLASS_FREQ_CTL 0x03000000ULL
44 #define ATK_CLASS_FAN_CTL 0x04000000ULL
45 #define ATK_CLASS_HWMON 0x06000000ULL
46 #define ATK_CLASS_MGMT 0x11000000ULL
47
48 #define ATK_TYPE_MASK 0x00ff0000ULL
49 #define HWMON_TYPE_VOLT 0x00020000ULL
50 #define HWMON_TYPE_TEMP 0x00030000ULL
51 #define HWMON_TYPE_FAN 0x00040000ULL
52
53 #define ATK_ELEMENT_ID_MASK 0x0000ffffULL
54
55 #define ATK_EC_ID 0x11060004ULL
56
57 enum atk_pack_member {
58 HWMON_PACK_FLAGS,
59 HWMON_PACK_NAME,
60 HWMON_PACK_LIMIT1,
61 HWMON_PACK_LIMIT2,
62 HWMON_PACK_ENABLE
63 };
64
65 /* New package format */
66 #define _HWMON_NEW_PACK_SIZE 7
67 #define _HWMON_NEW_PACK_FLAGS 0
68 #define _HWMON_NEW_PACK_NAME 1
69 #define _HWMON_NEW_PACK_UNK1 2
70 #define _HWMON_NEW_PACK_UNK2 3
71 #define _HWMON_NEW_PACK_LIMIT1 4
72 #define _HWMON_NEW_PACK_LIMIT2 5
73 #define _HWMON_NEW_PACK_ENABLE 6
74
75 /* Old package format */
76 #define _HWMON_OLD_PACK_SIZE 5
77 #define _HWMON_OLD_PACK_FLAGS 0
78 #define _HWMON_OLD_PACK_NAME 1
79 #define _HWMON_OLD_PACK_LIMIT1 2
80 #define _HWMON_OLD_PACK_LIMIT2 3
81 #define _HWMON_OLD_PACK_ENABLE 4
82
83
84 struct atk_data {
85 struct device *hwmon_dev;
86 acpi_handle atk_handle;
87 struct acpi_device *acpi_dev;
88
89 bool old_interface;
90
91 /* old interface */
92 acpi_handle rtmp_handle;
93 acpi_handle rvlt_handle;
94 acpi_handle rfan_handle;
95 /* new inteface */
96 acpi_handle enumerate_handle;
97 acpi_handle read_handle;
98 acpi_handle write_handle;
99
100 bool disable_ec;
101
102 int voltage_count;
103 int temperature_count;
104 int fan_count;
105 struct list_head sensor_list;
106
107 struct {
108 struct dentry *root;
109 u32 id;
110 } debugfs;
111 };
112
113
114 typedef ssize_t (*sysfs_show_func)(struct device *dev,
115 struct device_attribute *attr, char *buf);
116
117 static const struct acpi_device_id atk_ids[] = {
118 {ATK_HID, 0},
119 {"", 0},
120 };
121 MODULE_DEVICE_TABLE(acpi, atk_ids);
122
123 #define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */
124
125 struct atk_sensor_data {
126 struct list_head list;
127 struct atk_data *data;
128 struct device_attribute label_attr;
129 struct device_attribute input_attr;
130 struct device_attribute limit1_attr;
131 struct device_attribute limit2_attr;
132 char label_attr_name[ATTR_NAME_SIZE];
133 char input_attr_name[ATTR_NAME_SIZE];
134 char limit1_attr_name[ATTR_NAME_SIZE];
135 char limit2_attr_name[ATTR_NAME_SIZE];
136 u64 id;
137 u64 type;
138 u64 limit1;
139 u64 limit2;
140 u64 cached_value;
141 unsigned long last_updated; /* in jiffies */
142 bool is_valid;
143 char const *acpi_name;
144 };
145
146 /* Return buffer format:
147 * [0-3] "value" is valid flag
148 * [4-7] value
149 * [8- ] unknown stuff on newer mobos
150 */
151 struct atk_acpi_ret_buffer {
152 u32 flags;
153 u32 value;
154 u8 data[];
155 };
156
157 /* Input buffer used for GITM and SITM methods */
158 struct atk_acpi_input_buf {
159 u32 id;
160 u32 param1;
161 u32 param2;
162 };
163
164 static int atk_add(struct acpi_device *device);
165 static int atk_remove(struct acpi_device *device, int type);
166 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
167 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
168 static void atk_free_sensors(struct atk_data *data);
169
170 static struct acpi_driver atk_driver = {
171 .name = ATK_HID,
172 .class = "hwmon",
173 .ids = atk_ids,
174 .ops = {
175 .add = atk_add,
176 .remove = atk_remove,
177 },
178 };
179
180 #define input_to_atk_sensor(attr) \
181 container_of(attr, struct atk_sensor_data, input_attr)
182
183 #define label_to_atk_sensor(attr) \
184 container_of(attr, struct atk_sensor_data, label_attr)
185
186 #define limit1_to_atk_sensor(attr) \
187 container_of(attr, struct atk_sensor_data, limit1_attr)
188
189 #define limit2_to_atk_sensor(attr) \
190 container_of(attr, struct atk_sensor_data, limit2_attr)
191
192 static ssize_t atk_input_show(struct device *dev,
193 struct device_attribute *attr, char *buf)
194 {
195 struct atk_sensor_data *s = input_to_atk_sensor(attr);
196 u64 value;
197 int err;
198
199 err = atk_read_value(s, &value);
200 if (err)
201 return err;
202
203 if (s->type == HWMON_TYPE_TEMP)
204 /* ACPI returns decidegree */
205 value *= 100;
206
207 return sprintf(buf, "%llu\n", value);
208 }
209
210 static ssize_t atk_label_show(struct device *dev,
211 struct device_attribute *attr, char *buf)
212 {
213 struct atk_sensor_data *s = label_to_atk_sensor(attr);
214
215 return sprintf(buf, "%s\n", s->acpi_name);
216 }
217
218 static ssize_t atk_limit1_show(struct device *dev,
219 struct device_attribute *attr, char *buf)
220 {
221 struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
222 u64 value = s->limit1;
223
224 if (s->type == HWMON_TYPE_TEMP)
225 value *= 100;
226
227 return sprintf(buf, "%lld\n", value);
228 }
229
230 static ssize_t atk_limit2_show(struct device *dev,
231 struct device_attribute *attr, char *buf)
232 {
233 struct atk_sensor_data *s = limit2_to_atk_sensor(attr);
234 u64 value = s->limit2;
235
236 if (s->type == HWMON_TYPE_TEMP)
237 value *= 100;
238
239 return sprintf(buf, "%lld\n", value);
240 }
241
242 static ssize_t atk_name_show(struct device *dev,
243 struct device_attribute *attr, char *buf)
244 {
245 return sprintf(buf, "atk0110\n");
246 }
247 static struct device_attribute atk_name_attr =
248 __ATTR(name, 0444, atk_name_show, NULL);
249
250 static void atk_init_attribute(struct device_attribute *attr, char *name,
251 sysfs_show_func show)
252 {
253 attr->attr.name = name;
254 attr->attr.mode = 0444;
255 attr->show = show;
256 attr->store = NULL;
257 }
258
259
260 static union acpi_object *atk_get_pack_member(struct atk_data *data,
261 union acpi_object *pack,
262 enum atk_pack_member m)
263 {
264 bool old_if = data->old_interface;
265 int offset;
266
267 switch (m) {
268 case HWMON_PACK_FLAGS:
269 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS;
270 break;
271 case HWMON_PACK_NAME:
272 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME;
273 break;
274 case HWMON_PACK_LIMIT1:
275 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 :
276 _HWMON_NEW_PACK_LIMIT1;
277 break;
278 case HWMON_PACK_LIMIT2:
279 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 :
280 _HWMON_NEW_PACK_LIMIT2;
281 break;
282 case HWMON_PACK_ENABLE:
283 offset = old_if ? _HWMON_OLD_PACK_ENABLE :
284 _HWMON_NEW_PACK_ENABLE;
285 break;
286 default:
287 return NULL;
288 }
289
290 return &pack->package.elements[offset];
291 }
292
293
294 /* New package format is:
295 * - flag (int)
296 * class - used for de-muxing the request to the correct GITn
297 * type (volt, temp, fan)
298 * sensor id |
299 * sensor id - used for de-muxing the request _inside_ the GITn
300 * - name (str)
301 * - unknown (int)
302 * - unknown (int)
303 * - limit1 (int)
304 * - limit2 (int)
305 * - enable (int)
306 *
307 * The old package has the same format but it's missing the two unknown fields.
308 */
309 static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj)
310 {
311 struct device *dev = &data->acpi_dev->dev;
312 union acpi_object *tmp;
313 bool old_if = data->old_interface;
314 int const expected_size = old_if ? _HWMON_OLD_PACK_SIZE :
315 _HWMON_NEW_PACK_SIZE;
316
317 if (obj->type != ACPI_TYPE_PACKAGE) {
318 dev_warn(dev, "Invalid type: %d\n", obj->type);
319 return -EINVAL;
320 }
321
322 if (obj->package.count != expected_size) {
323 dev_warn(dev, "Invalid package size: %d, expected: %d\n",
324 obj->package.count, expected_size);
325 return -EINVAL;
326 }
327
328 tmp = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
329 if (tmp->type != ACPI_TYPE_INTEGER) {
330 dev_warn(dev, "Invalid type (flag): %d\n", tmp->type);
331 return -EINVAL;
332 }
333
334 tmp = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
335 if (tmp->type != ACPI_TYPE_STRING) {
336 dev_warn(dev, "Invalid type (name): %d\n", tmp->type);
337 return -EINVAL;
338 }
339
340 /* Don't check... we don't know what they're useful for anyway */
341 #if 0
342 tmp = &obj->package.elements[HWMON_PACK_UNK1];
343 if (tmp->type != ACPI_TYPE_INTEGER) {
344 dev_warn(dev, "Invalid type (unk1): %d\n", tmp->type);
345 return -EINVAL;
346 }
347
348 tmp = &obj->package.elements[HWMON_PACK_UNK2];
349 if (tmp->type != ACPI_TYPE_INTEGER) {
350 dev_warn(dev, "Invalid type (unk2): %d\n", tmp->type);
351 return -EINVAL;
352 }
353 #endif
354
355 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
356 if (tmp->type != ACPI_TYPE_INTEGER) {
357 dev_warn(dev, "Invalid type (limit1): %d\n", tmp->type);
358 return -EINVAL;
359 }
360
361 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
362 if (tmp->type != ACPI_TYPE_INTEGER) {
363 dev_warn(dev, "Invalid type (limit2): %d\n", tmp->type);
364 return -EINVAL;
365 }
366
367 tmp = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
368 if (tmp->type != ACPI_TYPE_INTEGER) {
369 dev_warn(dev, "Invalid type (enable): %d\n", tmp->type);
370 return -EINVAL;
371 }
372
373 atk_print_sensor(data, obj);
374
375 return 0;
376 }
377
378 #ifdef DEBUG
379 static char const *atk_sensor_type(union acpi_object *flags)
380 {
381 u64 type = flags->integer.value & ATK_TYPE_MASK;
382 char const *what;
383
384 switch (type) {
385 case HWMON_TYPE_VOLT:
386 what = "voltage";
387 break;
388 case HWMON_TYPE_TEMP:
389 what = "temperature";
390 break;
391 case HWMON_TYPE_FAN:
392 what = "fan";
393 break;
394 default:
395 what = "unknown";
396 break;
397 }
398
399 return what;
400 }
401 #endif
402
403 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
404 {
405 #ifdef DEBUG
406 struct device *dev = &data->acpi_dev->dev;
407 union acpi_object *flags;
408 union acpi_object *name;
409 union acpi_object *limit1;
410 union acpi_object *limit2;
411 union acpi_object *enable;
412 char const *what;
413
414 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
415 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
416 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
417 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
418 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
419
420 what = atk_sensor_type(flags);
421
422 dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what,
423 flags->integer.value,
424 name->string.pointer,
425 limit1->integer.value, limit2->integer.value,
426 enable->integer.value ? "enabled" : "disabled");
427 #endif
428 }
429
430 static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
431 {
432 struct atk_data *data = sensor->data;
433 struct device *dev = &data->acpi_dev->dev;
434 struct acpi_object_list params;
435 union acpi_object id;
436 acpi_status status;
437 acpi_handle method;
438
439 switch (sensor->type) {
440 case HWMON_TYPE_VOLT:
441 method = data->rvlt_handle;
442 break;
443 case HWMON_TYPE_TEMP:
444 method = data->rtmp_handle;
445 break;
446 case HWMON_TYPE_FAN:
447 method = data->rfan_handle;
448 break;
449 default:
450 return -EINVAL;
451 }
452
453 id.type = ACPI_TYPE_INTEGER;
454 id.integer.value = sensor->id;
455
456 params.count = 1;
457 params.pointer = &id;
458
459 status = acpi_evaluate_integer(method, NULL, &params, value);
460 if (status != AE_OK) {
461 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
462 acpi_format_exception(status));
463 return -EIO;
464 }
465
466 return 0;
467 }
468
469 static union acpi_object *atk_ggrp(struct atk_data *data, u16 mux)
470 {
471 struct device *dev = &data->acpi_dev->dev;
472 struct acpi_buffer buf;
473 acpi_status ret;
474 struct acpi_object_list params;
475 union acpi_object id;
476 union acpi_object *pack;
477
478 id.type = ACPI_TYPE_INTEGER;
479 id.integer.value = mux;
480 params.count = 1;
481 params.pointer = &id;
482
483 buf.length = ACPI_ALLOCATE_BUFFER;
484 ret = acpi_evaluate_object(data->enumerate_handle, NULL, &params, &buf);
485 if (ret != AE_OK) {
486 dev_err(dev, "GGRP[%#x] ACPI exception: %s\n", mux,
487 acpi_format_exception(ret));
488 return ERR_PTR(-EIO);
489 }
490 pack = buf.pointer;
491 if (pack->type != ACPI_TYPE_PACKAGE) {
492 /* Execution was successful, but the id was not found */
493 ACPI_FREE(pack);
494 return ERR_PTR(-ENOENT);
495 }
496
497 if (pack->package.count < 1) {
498 dev_err(dev, "GGRP[%#x] package is too small\n", mux);
499 ACPI_FREE(pack);
500 return ERR_PTR(-EIO);
501 }
502 return pack;
503 }
504
505 static union acpi_object *atk_gitm(struct atk_data *data, u64 id)
506 {
507 struct device *dev = &data->acpi_dev->dev;
508 struct atk_acpi_input_buf buf;
509 union acpi_object tmp;
510 struct acpi_object_list params;
511 struct acpi_buffer ret;
512 union acpi_object *obj;
513 acpi_status status;
514
515 buf.id = id;
516 buf.param1 = 0;
517 buf.param2 = 0;
518
519 tmp.type = ACPI_TYPE_BUFFER;
520 tmp.buffer.pointer = (u8 *)&buf;
521 tmp.buffer.length = sizeof(buf);
522
523 params.count = 1;
524 params.pointer = (void *)&tmp;
525
526 ret.length = ACPI_ALLOCATE_BUFFER;
527 status = acpi_evaluate_object_typed(data->read_handle, NULL, &params,
528 &ret, ACPI_TYPE_BUFFER);
529 if (status != AE_OK) {
530 dev_warn(dev, "GITM[%#llx] ACPI exception: %s\n", id,
531 acpi_format_exception(status));
532 return ERR_PTR(-EIO);
533 }
534 obj = ret.pointer;
535
536 /* Sanity check */
537 if (obj->buffer.length < 8) {
538 dev_warn(dev, "Unexpected ASBF length: %u\n",
539 obj->buffer.length);
540 ACPI_FREE(obj);
541 return ERR_PTR(-EIO);
542 }
543 return obj;
544 }
545
546 static union acpi_object *atk_sitm(struct atk_data *data,
547 struct atk_acpi_input_buf *buf)
548 {
549 struct device *dev = &data->acpi_dev->dev;
550 struct acpi_object_list params;
551 union acpi_object tmp;
552 struct acpi_buffer ret;
553 union acpi_object *obj;
554 acpi_status status;
555
556 tmp.type = ACPI_TYPE_BUFFER;
557 tmp.buffer.pointer = (u8 *)buf;
558 tmp.buffer.length = sizeof(*buf);
559
560 params.count = 1;
561 params.pointer = &tmp;
562
563 ret.length = ACPI_ALLOCATE_BUFFER;
564 status = acpi_evaluate_object_typed(data->write_handle, NULL, &params,
565 &ret, ACPI_TYPE_BUFFER);
566 if (status != AE_OK) {
567 dev_warn(dev, "SITM[%#x] ACPI exception: %s\n", buf->id,
568 acpi_format_exception(status));
569 return ERR_PTR(-EIO);
570 }
571 obj = ret.pointer;
572
573 /* Sanity check */
574 if (obj->buffer.length < 8) {
575 dev_warn(dev, "Unexpected ASBF length: %u\n",
576 obj->buffer.length);
577 ACPI_FREE(obj);
578 return ERR_PTR(-EIO);
579 }
580 return obj;
581 }
582
583 static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
584 {
585 struct atk_data *data = sensor->data;
586 struct device *dev = &data->acpi_dev->dev;
587 union acpi_object *obj;
588 struct atk_acpi_ret_buffer *buf;
589 int err = 0;
590
591 obj = atk_gitm(data, sensor->id);
592 if (IS_ERR(obj))
593 return PTR_ERR(obj);
594
595 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
596 if (buf->flags == 0) {
597 /* The reading is not valid, possible causes:
598 * - sensor failure
599 * - enumeration was FUBAR (and we didn't notice)
600 */
601 dev_warn(dev, "Read failed, sensor = %#llx\n", sensor->id);
602 err = -EIO;
603 goto out;
604 }
605
606 *value = buf->value;
607 out:
608 ACPI_FREE(obj);
609 return err;
610 }
611
612 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
613 {
614 int err;
615
616 if (!sensor->is_valid ||
617 time_after(jiffies, sensor->last_updated + CACHE_TIME)) {
618 if (sensor->data->old_interface)
619 err = atk_read_value_old(sensor, value);
620 else
621 err = atk_read_value_new(sensor, value);
622
623 sensor->is_valid = true;
624 sensor->last_updated = jiffies;
625 sensor->cached_value = *value;
626 } else {
627 *value = sensor->cached_value;
628 err = 0;
629 }
630
631 return err;
632 }
633
634 #ifdef CONFIG_DEBUG_FS
635 static int atk_debugfs_gitm_get(void *p, u64 *val)
636 {
637 struct atk_data *data = p;
638 union acpi_object *ret;
639 struct atk_acpi_ret_buffer *buf;
640 int err = 0;
641
642 if (!data->read_handle)
643 return -ENODEV;
644
645 if (!data->debugfs.id)
646 return -EINVAL;
647
648 ret = atk_gitm(data, data->debugfs.id);
649 if (IS_ERR(ret))
650 return PTR_ERR(ret);
651
652 buf = (struct atk_acpi_ret_buffer *)ret->buffer.pointer;
653 if (buf->flags)
654 *val = buf->value;
655 else
656 err = -EIO;
657
658 return err;
659 }
660
661 DEFINE_SIMPLE_ATTRIBUTE(atk_debugfs_gitm,
662 atk_debugfs_gitm_get,
663 NULL,
664 "0x%08llx\n")
665
666 static int atk_acpi_print(char *buf, size_t sz, union acpi_object *obj)
667 {
668 int ret = 0;
669
670 switch (obj->type) {
671 case ACPI_TYPE_INTEGER:
672 ret = snprintf(buf, sz, "0x%08llx\n", obj->integer.value);
673 break;
674 case ACPI_TYPE_STRING:
675 ret = snprintf(buf, sz, "%s\n", obj->string.pointer);
676 break;
677 }
678
679 return ret;
680 }
681
682 static void atk_pack_print(char *buf, size_t sz, union acpi_object *pack)
683 {
684 int ret;
685 int i;
686
687 for (i = 0; i < pack->package.count; i++) {
688 union acpi_object *obj = &pack->package.elements[i];
689
690 ret = atk_acpi_print(buf, sz, obj);
691 if (ret >= sz)
692 break;
693 buf += ret;
694 sz -= ret;
695 }
696 }
697
698 static int atk_debugfs_ggrp_open(struct inode *inode, struct file *file)
699 {
700 struct atk_data *data = inode->i_private;
701 char *buf = NULL;
702 union acpi_object *ret;
703 u8 cls;
704 int i;
705
706 if (!data->enumerate_handle)
707 return -ENODEV;
708 if (!data->debugfs.id)
709 return -EINVAL;
710
711 cls = (data->debugfs.id & 0xff000000) >> 24;
712 ret = atk_ggrp(data, cls);
713 if (IS_ERR(ret))
714 return PTR_ERR(ret);
715
716 for (i = 0; i < ret->package.count; i++) {
717 union acpi_object *pack = &ret->package.elements[i];
718 union acpi_object *id;
719
720 if (pack->type != ACPI_TYPE_PACKAGE)
721 continue;
722 if (!pack->package.count)
723 continue;
724 id = &pack->package.elements[0];
725 if (id->integer.value == data->debugfs.id) {
726 /* Print the package */
727 buf = kzalloc(512, GFP_KERNEL);
728 if (!buf) {
729 ACPI_FREE(ret);
730 return -ENOMEM;
731 }
732 atk_pack_print(buf, 512, pack);
733 break;
734 }
735 }
736 ACPI_FREE(ret);
737
738 if (!buf)
739 return -EINVAL;
740
741 file->private_data = buf;
742
743 return nonseekable_open(inode, file);
744 }
745
746 static ssize_t atk_debugfs_ggrp_read(struct file *file, char __user *buf,
747 size_t count, loff_t *pos)
748 {
749 char *str = file->private_data;
750 size_t len = strlen(str);
751
752 return simple_read_from_buffer(buf, count, pos, str, len);
753 }
754
755 static int atk_debugfs_ggrp_release(struct inode *inode, struct file *file)
756 {
757 kfree(file->private_data);
758 return 0;
759 }
760
761 static const struct file_operations atk_debugfs_ggrp_fops = {
762 .read = atk_debugfs_ggrp_read,
763 .open = atk_debugfs_ggrp_open,
764 .release = atk_debugfs_ggrp_release,
765 };
766
767 static void atk_debugfs_init(struct atk_data *data)
768 {
769 struct dentry *d;
770 struct dentry *f;
771
772 data->debugfs.id = 0;
773
774 d = debugfs_create_dir("asus_atk0110", NULL);
775 if (!d || IS_ERR(d))
776 return;
777
778 f = debugfs_create_x32("id", S_IRUSR | S_IWUSR, d, &data->debugfs.id);
779 if (!f || IS_ERR(f))
780 goto cleanup;
781
782 f = debugfs_create_file("gitm", S_IRUSR, d, data,
783 &atk_debugfs_gitm);
784 if (!f || IS_ERR(f))
785 goto cleanup;
786
787 f = debugfs_create_file("ggrp", S_IRUSR, d, data,
788 &atk_debugfs_ggrp_fops);
789 if (!f || IS_ERR(f))
790 goto cleanup;
791
792 data->debugfs.root = d;
793
794 return;
795 cleanup:
796 debugfs_remove_recursive(d);
797 }
798
799 static void atk_debugfs_cleanup(struct atk_data *data)
800 {
801 debugfs_remove_recursive(data->debugfs.root);
802 }
803
804 #else /* CONFIG_DEBUG_FS */
805
806 static void atk_debugfs_init(struct atk_data *data)
807 {
808 }
809
810 static void atk_debugfs_cleanup(struct atk_data *data)
811 {
812 }
813 #endif
814
815 static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
816 {
817 struct device *dev = &data->acpi_dev->dev;
818 union acpi_object *flags;
819 union acpi_object *name;
820 union acpi_object *limit1;
821 union acpi_object *limit2;
822 union acpi_object *enable;
823 struct atk_sensor_data *sensor;
824 char const *base_name;
825 char const *limit1_name;
826 char const *limit2_name;
827 u64 type;
828 int err;
829 int *num;
830 int start;
831
832 if (obj->type != ACPI_TYPE_PACKAGE) {
833 /* wft is this? */
834 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
835 obj->type);
836 return -EINVAL;
837 }
838
839 err = validate_hwmon_pack(data, obj);
840 if (err)
841 return err;
842
843 /* Ok, we have a valid hwmon package */
844 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
845 & ATK_TYPE_MASK;
846
847 switch (type) {
848 case HWMON_TYPE_VOLT:
849 base_name = "in";
850 limit1_name = "min";
851 limit2_name = "max";
852 num = &data->voltage_count;
853 start = 0;
854 break;
855 case HWMON_TYPE_TEMP:
856 base_name = "temp";
857 limit1_name = "max";
858 limit2_name = "crit";
859 num = &data->temperature_count;
860 start = 1;
861 break;
862 case HWMON_TYPE_FAN:
863 base_name = "fan";
864 limit1_name = "min";
865 limit2_name = "max";
866 num = &data->fan_count;
867 start = 1;
868 break;
869 default:
870 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
871 return -EINVAL;
872 }
873
874 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
875 if (!enable->integer.value)
876 /* sensor is disabled */
877 return 0;
878
879 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
880 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
881 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
882 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
883
884 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
885 if (!sensor)
886 return -ENOMEM;
887
888 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
889 if (!sensor->acpi_name) {
890 err = -ENOMEM;
891 goto out;
892 }
893
894 INIT_LIST_HEAD(&sensor->list);
895 sensor->type = type;
896 sensor->data = data;
897 sensor->id = flags->integer.value;
898 sensor->limit1 = limit1->integer.value;
899 if (data->old_interface)
900 sensor->limit2 = limit2->integer.value;
901 else
902 /* The upper limit is expressed as delta from lower limit */
903 sensor->limit2 = sensor->limit1 + limit2->integer.value;
904
905 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
906 "%s%d_input", base_name, start + *num);
907 atk_init_attribute(&sensor->input_attr,
908 sensor->input_attr_name,
909 atk_input_show);
910
911 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
912 "%s%d_label", base_name, start + *num);
913 atk_init_attribute(&sensor->label_attr,
914 sensor->label_attr_name,
915 atk_label_show);
916
917 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
918 "%s%d_%s", base_name, start + *num, limit1_name);
919 atk_init_attribute(&sensor->limit1_attr,
920 sensor->limit1_attr_name,
921 atk_limit1_show);
922
923 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
924 "%s%d_%s", base_name, start + *num, limit2_name);
925 atk_init_attribute(&sensor->limit2_attr,
926 sensor->limit2_attr_name,
927 atk_limit2_show);
928
929 list_add(&sensor->list, &data->sensor_list);
930 (*num)++;
931
932 return 1;
933 out:
934 kfree(sensor->acpi_name);
935 kfree(sensor);
936 return err;
937 }
938
939 static int atk_enumerate_old_hwmon(struct atk_data *data)
940 {
941 struct device *dev = &data->acpi_dev->dev;
942 struct acpi_buffer buf;
943 union acpi_object *pack;
944 acpi_status status;
945 int i, ret;
946 int count = 0;
947
948 /* Voltages */
949 buf.length = ACPI_ALLOCATE_BUFFER;
950 status = acpi_evaluate_object_typed(data->atk_handle,
951 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
952 if (status != AE_OK) {
953 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
954 acpi_format_exception(status));
955
956 return -ENODEV;
957 }
958
959 pack = buf.pointer;
960 for (i = 1; i < pack->package.count; i++) {
961 union acpi_object *obj = &pack->package.elements[i];
962
963 ret = atk_add_sensor(data, obj);
964 if (ret > 0)
965 count++;
966 }
967 ACPI_FREE(buf.pointer);
968
969 /* Temperatures */
970 buf.length = ACPI_ALLOCATE_BUFFER;
971 status = acpi_evaluate_object_typed(data->atk_handle,
972 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
973 if (status != AE_OK) {
974 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
975 acpi_format_exception(status));
976
977 ret = -ENODEV;
978 goto cleanup;
979 }
980
981 pack = buf.pointer;
982 for (i = 1; i < pack->package.count; i++) {
983 union acpi_object *obj = &pack->package.elements[i];
984
985 ret = atk_add_sensor(data, obj);
986 if (ret > 0)
987 count++;
988 }
989 ACPI_FREE(buf.pointer);
990
991 /* Fans */
992 buf.length = ACPI_ALLOCATE_BUFFER;
993 status = acpi_evaluate_object_typed(data->atk_handle,
994 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
995 if (status != AE_OK) {
996 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
997 acpi_format_exception(status));
998
999 ret = -ENODEV;
1000 goto cleanup;
1001 }
1002
1003 pack = buf.pointer;
1004 for (i = 1; i < pack->package.count; i++) {
1005 union acpi_object *obj = &pack->package.elements[i];
1006
1007 ret = atk_add_sensor(data, obj);
1008 if (ret > 0)
1009 count++;
1010 }
1011 ACPI_FREE(buf.pointer);
1012
1013 return count;
1014 cleanup:
1015 atk_free_sensors(data);
1016 return ret;
1017 }
1018
1019 static int atk_ec_present(struct atk_data *data)
1020 {
1021 struct device *dev = &data->acpi_dev->dev;
1022 union acpi_object *pack;
1023 union acpi_object *ec;
1024 int ret;
1025 int i;
1026
1027 pack = atk_ggrp(data, ATK_MUX_MGMT);
1028 if (IS_ERR(pack)) {
1029 if (PTR_ERR(pack) == -ENOENT) {
1030 /* The MGMT class does not exists - that's ok */
1031 dev_dbg(dev, "Class %#llx not found\n", ATK_MUX_MGMT);
1032 return 0;
1033 }
1034 return PTR_ERR(pack);
1035 }
1036
1037 /* Search the EC */
1038 ec = NULL;
1039 for (i = 0; i < pack->package.count; i++) {
1040 union acpi_object *obj = &pack->package.elements[i];
1041 union acpi_object *id;
1042
1043 if (obj->type != ACPI_TYPE_PACKAGE)
1044 continue;
1045
1046 id = &obj->package.elements[0];
1047 if (id->type != ACPI_TYPE_INTEGER)
1048 continue;
1049
1050 if (id->integer.value == ATK_EC_ID) {
1051 ec = obj;
1052 break;
1053 }
1054 }
1055
1056 ret = (ec != NULL);
1057 if (!ret)
1058 /* The system has no EC */
1059 dev_dbg(dev, "EC not found\n");
1060
1061 ACPI_FREE(pack);
1062 return ret;
1063 }
1064
1065 static int atk_ec_enabled(struct atk_data *data)
1066 {
1067 struct device *dev = &data->acpi_dev->dev;
1068 union acpi_object *obj;
1069 struct atk_acpi_ret_buffer *buf;
1070 int err;
1071
1072 obj = atk_gitm(data, ATK_EC_ID);
1073 if (IS_ERR(obj)) {
1074 dev_err(dev, "Unable to query EC status\n");
1075 return PTR_ERR(obj);
1076 }
1077 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1078
1079 if (buf->flags == 0) {
1080 dev_err(dev, "Unable to query EC status\n");
1081 err = -EIO;
1082 } else {
1083 err = (buf->value != 0);
1084 dev_dbg(dev, "EC is %sabled\n",
1085 err ? "en" : "dis");
1086 }
1087
1088 ACPI_FREE(obj);
1089 return err;
1090 }
1091
1092 static int atk_ec_ctl(struct atk_data *data, int enable)
1093 {
1094 struct device *dev = &data->acpi_dev->dev;
1095 union acpi_object *obj;
1096 struct atk_acpi_input_buf sitm;
1097 struct atk_acpi_ret_buffer *ec_ret;
1098 int err = 0;
1099
1100 sitm.id = ATK_EC_ID;
1101 sitm.param1 = enable;
1102 sitm.param2 = 0;
1103
1104 obj = atk_sitm(data, &sitm);
1105 if (IS_ERR(obj)) {
1106 dev_err(dev, "Failed to %sable the EC\n",
1107 enable ? "en" : "dis");
1108 return PTR_ERR(obj);
1109 }
1110 ec_ret = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
1111 if (ec_ret->flags == 0) {
1112 dev_err(dev, "Failed to %sable the EC\n",
1113 enable ? "en" : "dis");
1114 err = -EIO;
1115 } else {
1116 dev_info(dev, "EC %sabled\n",
1117 enable ? "en" : "dis");
1118 }
1119
1120 ACPI_FREE(obj);
1121 return err;
1122 }
1123
1124 static int atk_enumerate_new_hwmon(struct atk_data *data)
1125 {
1126 struct device *dev = &data->acpi_dev->dev;
1127 union acpi_object *pack;
1128 int err;
1129 int i;
1130
1131 err = atk_ec_present(data);
1132 if (err < 0)
1133 return err;
1134 if (err) {
1135 err = atk_ec_enabled(data);
1136 if (err < 0)
1137 return err;
1138 /* If the EC was disabled we will disable it again on unload */
1139 data->disable_ec = err;
1140
1141 err = atk_ec_ctl(data, 1);
1142 if (err) {
1143 data->disable_ec = false;
1144 return err;
1145 }
1146 }
1147
1148 dev_dbg(dev, "Enumerating hwmon sensors\n");
1149
1150 pack = atk_ggrp(data, ATK_MUX_HWMON);
1151 if (IS_ERR(pack))
1152 return PTR_ERR(pack);
1153
1154 for (i = 0; i < pack->package.count; i++) {
1155 union acpi_object *obj = &pack->package.elements[i];
1156
1157 atk_add_sensor(data, obj);
1158 }
1159
1160 err = data->voltage_count + data->temperature_count + data->fan_count;
1161
1162 ACPI_FREE(pack);
1163 return err;
1164 }
1165
1166 static int atk_create_files(struct atk_data *data)
1167 {
1168 struct atk_sensor_data *s;
1169 int err;
1170
1171 list_for_each_entry(s, &data->sensor_list, list) {
1172 sysfs_attr_init(&s->input_attr.attr);
1173 err = device_create_file(data->hwmon_dev, &s->input_attr);
1174 if (err)
1175 return err;
1176 sysfs_attr_init(&s->label_attr.attr);
1177 err = device_create_file(data->hwmon_dev, &s->label_attr);
1178 if (err)
1179 return err;
1180 sysfs_attr_init(&s->limit1_attr.attr);
1181 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
1182 if (err)
1183 return err;
1184 sysfs_attr_init(&s->limit2_attr.attr);
1185 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
1186 if (err)
1187 return err;
1188 }
1189
1190 err = device_create_file(data->hwmon_dev, &atk_name_attr);
1191
1192 return err;
1193 }
1194
1195 static void atk_remove_files(struct atk_data *data)
1196 {
1197 struct atk_sensor_data *s;
1198
1199 list_for_each_entry(s, &data->sensor_list, list) {
1200 device_remove_file(data->hwmon_dev, &s->input_attr);
1201 device_remove_file(data->hwmon_dev, &s->label_attr);
1202 device_remove_file(data->hwmon_dev, &s->limit1_attr);
1203 device_remove_file(data->hwmon_dev, &s->limit2_attr);
1204 }
1205 device_remove_file(data->hwmon_dev, &atk_name_attr);
1206 }
1207
1208 static void atk_free_sensors(struct atk_data *data)
1209 {
1210 struct list_head *head = &data->sensor_list;
1211 struct atk_sensor_data *s, *tmp;
1212
1213 list_for_each_entry_safe(s, tmp, head, list) {
1214 kfree(s->acpi_name);
1215 kfree(s);
1216 }
1217 }
1218
1219 static int atk_register_hwmon(struct atk_data *data)
1220 {
1221 struct device *dev = &data->acpi_dev->dev;
1222 int err;
1223
1224 dev_dbg(dev, "registering hwmon device\n");
1225 data->hwmon_dev = hwmon_device_register(dev);
1226 if (IS_ERR(data->hwmon_dev))
1227 return PTR_ERR(data->hwmon_dev);
1228
1229 dev_dbg(dev, "populating sysfs directory\n");
1230 err = atk_create_files(data);
1231 if (err)
1232 goto remove;
1233
1234 return 0;
1235 remove:
1236 /* Cleanup the registered files */
1237 atk_remove_files(data);
1238 hwmon_device_unregister(data->hwmon_dev);
1239 return err;
1240 }
1241
1242 static int atk_probe_if(struct atk_data *data)
1243 {
1244 struct device *dev = &data->acpi_dev->dev;
1245 acpi_handle ret;
1246 acpi_status status;
1247 int err = 0;
1248
1249 /* RTMP: read temperature */
1250 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
1251 if (ACPI_SUCCESS(status))
1252 data->rtmp_handle = ret;
1253 else
1254 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
1255 acpi_format_exception(status));
1256
1257 /* RVLT: read voltage */
1258 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
1259 if (ACPI_SUCCESS(status))
1260 data->rvlt_handle = ret;
1261 else
1262 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
1263 acpi_format_exception(status));
1264
1265 /* RFAN: read fan status */
1266 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
1267 if (ACPI_SUCCESS(status))
1268 data->rfan_handle = ret;
1269 else
1270 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
1271 acpi_format_exception(status));
1272
1273 /* Enumeration */
1274 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
1275 if (ACPI_SUCCESS(status))
1276 data->enumerate_handle = ret;
1277 else
1278 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
1279 acpi_format_exception(status));
1280
1281 /* De-multiplexer (read) */
1282 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
1283 if (ACPI_SUCCESS(status))
1284 data->read_handle = ret;
1285 else
1286 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
1287 acpi_format_exception(status));
1288
1289 /* De-multiplexer (write) */
1290 status = acpi_get_handle(data->atk_handle, METHOD_WRITE, &ret);
1291 if (ACPI_SUCCESS(status))
1292 data->write_handle = ret;
1293 else
1294 dev_dbg(dev, "method " METHOD_WRITE " not found: %s\n",
1295 acpi_format_exception(status));
1296
1297 /* Check for hwmon methods: first check "old" style methods; note that
1298 * both may be present: in this case we stick to the old interface;
1299 * analysis of multiple DSDTs indicates that when both interfaces
1300 * are present the new one (GGRP/GITM) is not functional.
1301 */
1302 if (data->rtmp_handle && data->rvlt_handle && data->rfan_handle)
1303 data->old_interface = true;
1304 else if (data->enumerate_handle && data->read_handle &&
1305 data->write_handle)
1306 data->old_interface = false;
1307 else
1308 err = -ENODEV;
1309
1310 return err;
1311 }
1312
1313 static int atk_add(struct acpi_device *device)
1314 {
1315 acpi_status ret;
1316 int err;
1317 struct acpi_buffer buf;
1318 union acpi_object *obj;
1319 struct atk_data *data;
1320
1321 dev_dbg(&device->dev, "adding...\n");
1322
1323 data = kzalloc(sizeof(*data), GFP_KERNEL);
1324 if (!data)
1325 return -ENOMEM;
1326
1327 data->acpi_dev = device;
1328 data->atk_handle = device->handle;
1329 INIT_LIST_HEAD(&data->sensor_list);
1330 data->disable_ec = false;
1331
1332 buf.length = ACPI_ALLOCATE_BUFFER;
1333 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
1334 &buf, ACPI_TYPE_PACKAGE);
1335 if (ret != AE_OK) {
1336 dev_dbg(&device->dev, "atk: method MBIF not found\n");
1337 } else {
1338 obj = buf.pointer;
1339 if (obj->package.count >= 2) {
1340 union acpi_object *id = &obj->package.elements[1];
1341 if (id->type == ACPI_TYPE_STRING)
1342 dev_dbg(&device->dev, "board ID = %s\n",
1343 id->string.pointer);
1344 }
1345 ACPI_FREE(buf.pointer);
1346 }
1347
1348 err = atk_probe_if(data);
1349 if (err) {
1350 dev_err(&device->dev, "No usable hwmon interface detected\n");
1351 goto out;
1352 }
1353
1354 if (data->old_interface) {
1355 dev_dbg(&device->dev, "Using old hwmon interface\n");
1356 err = atk_enumerate_old_hwmon(data);
1357 } else {
1358 dev_dbg(&device->dev, "Using new hwmon interface\n");
1359 err = atk_enumerate_new_hwmon(data);
1360 }
1361 if (err < 0)
1362 goto out;
1363 if (err == 0) {
1364 dev_info(&device->dev,
1365 "No usable sensor detected, bailing out\n");
1366 err = -ENODEV;
1367 goto out;
1368 }
1369
1370 err = atk_register_hwmon(data);
1371 if (err)
1372 goto cleanup;
1373
1374 atk_debugfs_init(data);
1375
1376 device->driver_data = data;
1377 return 0;
1378 cleanup:
1379 atk_free_sensors(data);
1380 out:
1381 if (data->disable_ec)
1382 atk_ec_ctl(data, 0);
1383 kfree(data);
1384 return err;
1385 }
1386
1387 static int atk_remove(struct acpi_device *device, int type)
1388 {
1389 struct atk_data *data = device->driver_data;
1390 dev_dbg(&device->dev, "removing...\n");
1391
1392 device->driver_data = NULL;
1393
1394 atk_debugfs_cleanup(data);
1395
1396 atk_remove_files(data);
1397 atk_free_sensors(data);
1398 hwmon_device_unregister(data->hwmon_dev);
1399
1400 if (data->disable_ec) {
1401 if (atk_ec_ctl(data, 0))
1402 dev_err(&device->dev, "Failed to disable EC\n");
1403 }
1404
1405 kfree(data);
1406
1407 return 0;
1408 }
1409
1410 static int __init atk0110_init(void)
1411 {
1412 int ret;
1413
1414 /* Make sure it's safe to access the device through ACPI */
1415 if (!acpi_resources_are_enforced()) {
1416 pr_err("atk: Resources not safely usable due to "
1417 "acpi_enforce_resources kernel parameter\n");
1418 return -EBUSY;
1419 }
1420
1421 ret = acpi_bus_register_driver(&atk_driver);
1422 if (ret)
1423 pr_info("atk: acpi_bus_register_driver failed: %d\n", ret);
1424
1425 return ret;
1426 }
1427
1428 static void __exit atk0110_exit(void)
1429 {
1430 acpi_bus_unregister_driver(&atk_driver);
1431 }
1432
1433 module_init(atk0110_init);
1434 module_exit(atk0110_exit);
1435
1436 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree