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close_port, kpacket_gen kmalloc oom, formard.c wake_sender/skb receive oom handling...
[cor_2_6_31.git] / drivers / hwmon / asus_atk0110.c
blobfe4fa29c9219b9884e2e55065728920240a55e14
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
51 enum 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
78 struct 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
100 typedef ssize_t (*sysfs_show_func)(struct device *dev,
101 struct device_attribute *attr, char *buf);
102
103 static const struct acpi_device_id atk_ids[] = {
104 {ATK_HID, 0},
105 {"", 0},
106 };
107 MODULE_DEVICE_TABLE(acpi, atk_ids);
108
109 #define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */
110
111 struct 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
132 struct atk_acpi_buffer_u64 {
133 union acpi_object buf;
134 u64 value;
135 };
136
137 static int atk_add(struct acpi_device *device);
138 static int atk_remove(struct acpi_device *device, int type);
139 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
140 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
141 static void atk_free_sensors(struct atk_data *data);
142
143 static 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
165 static 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
183 static 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
191 static 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
203 static 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
215 static ssize_t atk_name_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
217 {
218 return sprintf(buf, "atk0110\n");
219 }
220 static struct device_attribute atk_name_attr =
221 __ATTR(name, 0444, atk_name_show, NULL);
222
223 static 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
233 static 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 */
282 static 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
351 #ifdef DEBUG
352 static char const *atk_sensor_type(union acpi_object *flags)
353 {
354 u64 type = flags->integer.value & ATK_TYPE_MASK;
355 char const *what;
356
357 switch (type) {
358 case HWMON_TYPE_VOLT:
359 what = "voltage";
360 break;
361 case HWMON_TYPE_TEMP:
362 what = "temperature";
363 break;
364 case HWMON_TYPE_FAN:
365 what = "fan";
366 break;
367 default:
368 what = "unknown";
369 break;
370 }
371
372 return what;
373 }
374 #endif
375
376 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
377 {
378 #ifdef DEBUG
379 struct device *dev = &data->acpi_dev->dev;
380 union acpi_object *flags;
381 union acpi_object *name;
382 union acpi_object *limit1;
383 union acpi_object *limit2;
384 union acpi_object *enable;
385 char const *what;
386
387 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
388 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
389 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
390 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
391 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
392
393 what = atk_sensor_type(flags);
394
395 dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what,
396 flags->integer.value,
397 name->string.pointer,
398 limit1->integer.value, limit2->integer.value,
399 enable->integer.value ? "enabled" : "disabled");
400 #endif
401 }
402
403 static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
404 {
405 struct atk_data *data = sensor->data;
406 struct device *dev = &data->acpi_dev->dev;
407 struct acpi_object_list params;
408 union acpi_object id;
409 acpi_status status;
410 acpi_handle method;
411
412 switch (sensor->type) {
413 case HWMON_TYPE_VOLT:
414 method = data->rvlt_handle;
415 break;
416 case HWMON_TYPE_TEMP:
417 method = data->rtmp_handle;
418 break;
419 case HWMON_TYPE_FAN:
420 method = data->rfan_handle;
421 break;
422 default:
423 return -EINVAL;
424 }
425
426 id.type = ACPI_TYPE_INTEGER;
427 id.integer.value = sensor->id;
428
429 params.count = 1;
430 params.pointer = &id;
431
432 status = acpi_evaluate_integer(method, NULL, &params, value);
433 if (status != AE_OK) {
434 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
435 acpi_format_exception(status));
436 return -EIO;
437 }
438
439 return 0;
440 }
441
442 static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
443 {
444 struct atk_data *data = sensor->data;
445 struct device *dev = &data->acpi_dev->dev;
446 struct acpi_object_list params;
447 struct acpi_buffer ret;
448 union acpi_object id;
449 struct atk_acpi_buffer_u64 tmp;
450 acpi_status status;
451
452 id.type = ACPI_TYPE_INTEGER;
453 id.integer.value = sensor->id;
454
455 params.count = 1;
456 params.pointer = &id;
457
458 tmp.buf.type = ACPI_TYPE_BUFFER;
459 tmp.buf.buffer.pointer = (u8 *)&tmp.value;
460 tmp.buf.buffer.length = sizeof(u64);
461 ret.length = sizeof(tmp);
462 ret.pointer = &tmp;
463
464 status = acpi_evaluate_object_typed(data->read_handle, NULL, &params,
465 &ret, ACPI_TYPE_BUFFER);
466 if (status != AE_OK) {
467 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
468 acpi_format_exception(status));
469 return -EIO;
470 }
471
472 /* Return buffer format:
473 * [0-3] "value" is valid flag
474 * [4-7] value
475 */
476 if (!(tmp.value & 0xffffffff)) {
477 /* The reading is not valid, possible causes:
478 * - sensor failure
479 * - enumeration was FUBAR (and we didn't notice)
480 */
481 dev_info(dev, "Failure: %#llx\n", tmp.value);
482 return -EIO;
483 }
484
485 *value = (tmp.value & 0xffffffff00000000ULL) >> 32;
486
487 return 0;
488 }
489
490 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
491 {
492 int err;
493
494 if (!sensor->is_valid ||
495 time_after(jiffies, sensor->last_updated + CACHE_TIME)) {
496 if (sensor->data->old_interface)
497 err = atk_read_value_old(sensor, value);
498 else
499 err = atk_read_value_new(sensor, value);
500
501 sensor->is_valid = true;
502 sensor->last_updated = jiffies;
503 sensor->cached_value = *value;
504 } else {
505 *value = sensor->cached_value;
506 err = 0;
507 }
508
509 return err;
510 }
511
512 static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
513 {
514 struct device *dev = &data->acpi_dev->dev;
515 union acpi_object *flags;
516 union acpi_object *name;
517 union acpi_object *limit1;
518 union acpi_object *limit2;
519 union acpi_object *enable;
520 struct atk_sensor_data *sensor;
521 char const *base_name;
522 char const *limit1_name;
523 char const *limit2_name;
524 u64 type;
525 int err;
526 int *num;
527 int start;
528
529 if (obj->type != ACPI_TYPE_PACKAGE) {
530 /* wft is this? */
531 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
532 obj->type);
533 return -EINVAL;
534 }
535
536 err = validate_hwmon_pack(data, obj);
537 if (err)
538 return err;
539
540 /* Ok, we have a valid hwmon package */
541 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
542 & ATK_TYPE_MASK;
543
544 switch (type) {
545 case HWMON_TYPE_VOLT:
546 base_name = "in";
547 limit1_name = "min";
548 limit2_name = "max";
549 num = &data->voltage_count;
550 start = 0;
551 break;
552 case HWMON_TYPE_TEMP:
553 base_name = "temp";
554 limit1_name = "max";
555 limit2_name = "crit";
556 num = &data->temperature_count;
557 start = 1;
558 break;
559 case HWMON_TYPE_FAN:
560 base_name = "fan";
561 limit1_name = "min";
562 limit2_name = "max";
563 num = &data->fan_count;
564 start = 1;
565 break;
566 default:
567 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
568 return -EINVAL;
569 }
570
571 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
572 if (!enable->integer.value)
573 /* sensor is disabled */
574 return 0;
575
576 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
577 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
578 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
579 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
580
581 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
582 if (!sensor)
583 return -ENOMEM;
584
585 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
586 if (!sensor->acpi_name) {
587 err = -ENOMEM;
588 goto out;
589 }
590
591 INIT_LIST_HEAD(&sensor->list);
592 sensor->type = type;
593 sensor->data = data;
594 sensor->id = flags->integer.value;
595 sensor->limit1 = limit1->integer.value;
596 if (data->old_interface)
597 sensor->limit2 = limit2->integer.value;
598 else
599 /* The upper limit is expressed as delta from lower limit */
600 sensor->limit2 = sensor->limit1 + limit2->integer.value;
601
602 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
603 "%s%d_input", base_name, start + *num);
604 atk_init_attribute(&sensor->input_attr,
605 sensor->input_attr_name,
606 atk_input_show);
607
608 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
609 "%s%d_label", base_name, start + *num);
610 atk_init_attribute(&sensor->label_attr,
611 sensor->label_attr_name,
612 atk_label_show);
613
614 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
615 "%s%d_%s", base_name, start + *num, limit1_name);
616 atk_init_attribute(&sensor->limit1_attr,
617 sensor->limit1_attr_name,
618 atk_limit1_show);
619
620 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
621 "%s%d_%s", base_name, start + *num, limit2_name);
622 atk_init_attribute(&sensor->limit2_attr,
623 sensor->limit2_attr_name,
624 atk_limit2_show);
625
626 list_add(&sensor->list, &data->sensor_list);
627 (*num)++;
628
629 return 1;
630 out:
631 kfree(sensor->acpi_name);
632 kfree(sensor);
633 return err;
634 }
635
636 static int atk_enumerate_old_hwmon(struct atk_data *data)
637 {
638 struct device *dev = &data->acpi_dev->dev;
639 struct acpi_buffer buf;
640 union acpi_object *pack;
641 acpi_status status;
642 int i, ret;
643 int count = 0;
644
645 /* Voltages */
646 buf.length = ACPI_ALLOCATE_BUFFER;
647 status = acpi_evaluate_object_typed(data->atk_handle,
648 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
649 if (status != AE_OK) {
650 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
651 acpi_format_exception(status));
652
653 return -ENODEV;
654 }
655
656 pack = buf.pointer;
657 for (i = 1; i < pack->package.count; i++) {
658 union acpi_object *obj = &pack->package.elements[i];
659
660 ret = atk_add_sensor(data, obj);
661 if (ret > 0)
662 count++;
663 }
664 ACPI_FREE(buf.pointer);
665
666 /* Temperatures */
667 buf.length = ACPI_ALLOCATE_BUFFER;
668 status = acpi_evaluate_object_typed(data->atk_handle,
669 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
670 if (status != AE_OK) {
671 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
672 acpi_format_exception(status));
673
674 ret = -ENODEV;
675 goto cleanup;
676 }
677
678 pack = buf.pointer;
679 for (i = 1; i < pack->package.count; i++) {
680 union acpi_object *obj = &pack->package.elements[i];
681
682 ret = atk_add_sensor(data, obj);
683 if (ret > 0)
684 count++;
685 }
686 ACPI_FREE(buf.pointer);
687
688 /* Fans */
689 buf.length = ACPI_ALLOCATE_BUFFER;
690 status = acpi_evaluate_object_typed(data->atk_handle,
691 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
692 if (status != AE_OK) {
693 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
694 acpi_format_exception(status));
695
696 ret = -ENODEV;
697 goto cleanup;
698 }
699
700 pack = buf.pointer;
701 for (i = 1; i < pack->package.count; i++) {
702 union acpi_object *obj = &pack->package.elements[i];
703
704 ret = atk_add_sensor(data, obj);
705 if (ret > 0)
706 count++;
707 }
708 ACPI_FREE(buf.pointer);
709
710 return count;
711 cleanup:
712 atk_free_sensors(data);
713 return ret;
714 }
715
716 static int atk_enumerate_new_hwmon(struct atk_data *data)
717 {
718 struct device *dev = &data->acpi_dev->dev;
719 struct acpi_buffer buf;
720 acpi_status ret;
721 struct acpi_object_list params;
722 union acpi_object id;
723 union acpi_object *pack;
724 int err;
725 int i;
726
727 dev_dbg(dev, "Enumerating hwmon sensors\n");
728
729 id.type = ACPI_TYPE_INTEGER;
730 id.integer.value = ATK_MUX_HWMON;
731 params.count = 1;
732 params.pointer = &id;
733
734 buf.length = ACPI_ALLOCATE_BUFFER;
735 ret = acpi_evaluate_object_typed(data->enumerate_handle, NULL, &params,
736 &buf, ACPI_TYPE_PACKAGE);
737 if (ret != AE_OK) {
738 dev_warn(dev, METHOD_ENUMERATE ": ACPI exception: %s\n",
739 acpi_format_exception(ret));
740 return -ENODEV;
741 }
742
743 /* Result must be a package */
744 pack = buf.pointer;
745
746 if (pack->package.count < 1) {
747 dev_dbg(dev, "%s: hwmon package is too small: %d\n", __func__,
748 pack->package.count);
749 err = -EINVAL;
750 goto out;
751 }
752
753 for (i = 0; i < pack->package.count; i++) {
754 union acpi_object *obj = &pack->package.elements[i];
755
756 atk_add_sensor(data, obj);
757 }
758
759 err = data->voltage_count + data->temperature_count + data->fan_count;
760
761 out:
762 ACPI_FREE(buf.pointer);
763 return err;
764 }
765
766 static int atk_create_files(struct atk_data *data)
767 {
768 struct atk_sensor_data *s;
769 int err;
770
771 list_for_each_entry(s, &data->sensor_list, list) {
772 err = device_create_file(data->hwmon_dev, &s->input_attr);
773 if (err)
774 return err;
775 err = device_create_file(data->hwmon_dev, &s->label_attr);
776 if (err)
777 return err;
778 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
779 if (err)
780 return err;
781 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
782 if (err)
783 return err;
784 }
785
786 err = device_create_file(data->hwmon_dev, &atk_name_attr);
787
788 return err;
789 }
790
791 static void atk_remove_files(struct atk_data *data)
792 {
793 struct atk_sensor_data *s;
794
795 list_for_each_entry(s, &data->sensor_list, list) {
796 device_remove_file(data->hwmon_dev, &s->input_attr);
797 device_remove_file(data->hwmon_dev, &s->label_attr);
798 device_remove_file(data->hwmon_dev, &s->limit1_attr);
799 device_remove_file(data->hwmon_dev, &s->limit2_attr);
800 }
801 device_remove_file(data->hwmon_dev, &atk_name_attr);
802 }
803
804 static void atk_free_sensors(struct atk_data *data)
805 {
806 struct list_head *head = &data->sensor_list;
807 struct atk_sensor_data *s, *tmp;
808
809 list_for_each_entry_safe(s, tmp, head, list) {
810 kfree(s->acpi_name);
811 kfree(s);
812 }
813 }
814
815 static int atk_register_hwmon(struct atk_data *data)
816 {
817 struct device *dev = &data->acpi_dev->dev;
818 int err;
819
820 dev_dbg(dev, "registering hwmon device\n");
821 data->hwmon_dev = hwmon_device_register(dev);
822 if (IS_ERR(data->hwmon_dev))
823 return PTR_ERR(data->hwmon_dev);
824
825 dev_dbg(dev, "populating sysfs directory\n");
826 err = atk_create_files(data);
827 if (err)
828 goto remove;
829
830 return 0;
831 remove:
832 /* Cleanup the registered files */
833 atk_remove_files(data);
834 hwmon_device_unregister(data->hwmon_dev);
835 return err;
836 }
837
838 static int atk_check_old_if(struct atk_data *data)
839 {
840 struct device *dev = &data->acpi_dev->dev;
841 acpi_handle ret;
842 acpi_status status;
843
844 /* RTMP: read temperature */
845 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
846 if (status != AE_OK) {
847 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
848 acpi_format_exception(status));
849 return -ENODEV;
850 }
851 data->rtmp_handle = ret;
852
853 /* RVLT: read voltage */
854 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
855 if (status != AE_OK) {
856 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
857 acpi_format_exception(status));
858 return -ENODEV;
859 }
860 data->rvlt_handle = ret;
861
862 /* RFAN: read fan status */
863 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
864 if (status != AE_OK) {
865 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
866 acpi_format_exception(status));
867 return -ENODEV;
868 }
869 data->rfan_handle = ret;
870
871 return 0;
872 }
873
874 static int atk_check_new_if(struct atk_data *data)
875 {
876 struct device *dev = &data->acpi_dev->dev;
877 acpi_handle ret;
878 acpi_status status;
879
880 /* Enumeration */
881 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
882 if (status != AE_OK) {
883 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
884 acpi_format_exception(status));
885 return -ENODEV;
886 }
887 data->enumerate_handle = ret;
888
889 /* De-multiplexer (read) */
890 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
891 if (status != AE_OK) {
892 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
893 acpi_format_exception(status));
894 return -ENODEV;
895 }
896 data->read_handle = ret;
897
898 return 0;
899 }
900
901 static int atk_add(struct acpi_device *device)
902 {
903 acpi_status ret;
904 int err;
905 struct acpi_buffer buf;
906 union acpi_object *obj;
907 struct atk_data *data;
908
909 dev_dbg(&device->dev, "adding...\n");
910
911 data = kzalloc(sizeof(*data), GFP_KERNEL);
912 if (!data)
913 return -ENOMEM;
914
915 data->acpi_dev = device;
916 data->atk_handle = device->handle;
917 INIT_LIST_HEAD(&data->sensor_list);
918
919 buf.length = ACPI_ALLOCATE_BUFFER;
920 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
921 &buf, ACPI_TYPE_PACKAGE);
922 if (ret != AE_OK) {
923 dev_dbg(&device->dev, "atk: method MBIF not found\n");
924 err = -ENODEV;
925 goto out;
926 }
927
928 obj = buf.pointer;
929 if (obj->package.count >= 2 &&
930 obj->package.elements[1].type == ACPI_TYPE_STRING) {
931 dev_dbg(&device->dev, "board ID = %s\n",
932 obj->package.elements[1].string.pointer);
933 }
934 ACPI_FREE(buf.pointer);
935
936 /* Check for hwmon methods: first check "old" style methods; note that
937 * both may be present: in this case we stick to the old interface;
938 * analysis of multiple DSDTs indicates that when both interfaces
939 * are present the new one (GGRP/GITM) is not functional.
940 */
941 err = atk_check_old_if(data);
942 if (!err) {
943 dev_dbg(&device->dev, "Using old hwmon interface\n");
944 data->old_interface = true;
945 } else {
946 err = atk_check_new_if(data);
947 if (err)
948 goto out;
949
950 dev_dbg(&device->dev, "Using new hwmon interface\n");
951 data->old_interface = false;
952 }
953
954 if (data->old_interface)
955 err = atk_enumerate_old_hwmon(data);
956 else
957 err = atk_enumerate_new_hwmon(data);
958 if (err < 0)
959 goto out;
960 if (err == 0) {
961 dev_info(&device->dev,
962 "No usable sensor detected, bailing out\n");
963 err = -ENODEV;
964 goto out;
965 }
966
967 err = atk_register_hwmon(data);
968 if (err)
969 goto cleanup;
970
971 device->driver_data = data;
972 return 0;
973 cleanup:
974 atk_free_sensors(data);
975 out:
976 kfree(data);
977 return err;
978 }
979
980 static int atk_remove(struct acpi_device *device, int type)
981 {
982 struct atk_data *data = device->driver_data;
983 dev_dbg(&device->dev, "removing...\n");
984
985 device->driver_data = NULL;
986
987 atk_remove_files(data);
988 atk_free_sensors(data);
989 hwmon_device_unregister(data->hwmon_dev);
990
991 kfree(data);
992
993 return 0;
994 }
995
996 static int __init atk0110_init(void)
997 {
998 int ret;
999
1000 ret = acpi_bus_register_driver(&atk_driver);
1001 if (ret)
1002 pr_info("atk: acpi_bus_register_driver failed: %d\n", ret);
1003
1004 return ret;
1005 }
1006
1007 static void __exit atk0110_exit(void)
1008 {
1009 acpi_bus_unregister_driver(&atk_driver);
1010 }
1011
1012 module_init(atk0110_init);
1013 module_exit(atk0110_exit);
1014
1015 MODULE_LICENSE("GPL");
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