2 * Copyright (C) 2007-2009 Luca Tettamanti <kronos.it@gmail.com>
4 * This file is released under the GPLv2
5 * See COPYING in the top level directory of the kernel tree.
8 #include <linux/kernel.h>
9 #include <linux/hwmon.h>
10 #include <linux/list.h>
11 #include <linux/module.h>
13 #include <acpi/acpi.h>
14 #include <acpi/acpixf.h>
15 #include <acpi/acpi_drivers.h>
16 #include <acpi/acpi_bus.h>
19 #define ATK_HID "ATK0110"
21 /* Minimum time between readings, enforced in order to avoid
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"
37 #define ATK_MUX_HWMON 0x00000006ULL
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
44 #define ATK_TYPE_MASK 0x00ff0000ULL
45 #define HWMON_TYPE_VOLT 0x00020000ULL
46 #define HWMON_TYPE_TEMP 0x00030000ULL
47 #define HWMON_TYPE_FAN 0x00040000ULL
49 #define HWMON_SENSOR_ID_MASK 0x0000ffffULL
51 enum atk_pack_member {
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
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
79 struct device *hwmon_dev;
80 acpi_handle atk_handle;
81 struct acpi_device *acpi_dev;
86 acpi_handle rtmp_handle;
87 acpi_handle rvlt_handle;
88 acpi_handle rfan_handle;
90 acpi_handle enumerate_handle;
91 acpi_handle read_handle;
94 int temperature_count;
96 struct list_head sensor_list;
100 typedef ssize_t (*sysfs_show_func)(struct device *dev,
101 struct device_attribute *attr, char *buf);
103 static const struct acpi_device_id atk_ids[] = {
107 MODULE_DEVICE_TABLE(acpi, atk_ids);
109 #define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */
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];
127 unsigned long last_updated; /* in jiffies */
129 char const *acpi_name;
132 /* Return buffer format:
133 * [0-3] "value" is valid flag
135 * [8- ] unknown stuff on newer mobos
137 struct atk_acpi_ret_buffer {
143 /* Input buffer used for GITM and SITM methods */
144 struct atk_acpi_input_buf {
150 static int atk_add(struct acpi_device *device);
151 static int atk_remove(struct acpi_device *device, int type);
152 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
153 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
154 static void atk_free_sensors(struct atk_data *data);
156 static struct acpi_driver atk_driver = {
162 .remove = atk_remove,
166 #define input_to_atk_sensor(attr) \
167 container_of(attr, struct atk_sensor_data, input_attr)
169 #define label_to_atk_sensor(attr) \
170 container_of(attr, struct atk_sensor_data, label_attr)
172 #define limit1_to_atk_sensor(attr) \
173 container_of(attr, struct atk_sensor_data, limit1_attr)
175 #define limit2_to_atk_sensor(attr) \
176 container_of(attr, struct atk_sensor_data, limit2_attr)
178 static ssize_t atk_input_show(struct device *dev,
179 struct device_attribute *attr, char *buf)
181 struct atk_sensor_data *s = input_to_atk_sensor(attr);
185 err = atk_read_value(s, &value);
189 if (s->type == HWMON_TYPE_TEMP)
190 /* ACPI returns decidegree */
193 return sprintf(buf, "%llu\n", value);
196 static ssize_t atk_label_show(struct device *dev,
197 struct device_attribute *attr, char *buf)
199 struct atk_sensor_data *s = label_to_atk_sensor(attr);
201 return sprintf(buf, "%s\n", s->acpi_name);
204 static ssize_t atk_limit1_show(struct device *dev,
205 struct device_attribute *attr, char *buf)
207 struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
208 u64 value = s->limit1;
210 if (s->type == HWMON_TYPE_TEMP)
213 return sprintf(buf, "%lld\n", value);
216 static ssize_t atk_limit2_show(struct device *dev,
217 struct device_attribute *attr, char *buf)
219 struct atk_sensor_data *s = limit2_to_atk_sensor(attr);
220 u64 value = s->limit2;
222 if (s->type == HWMON_TYPE_TEMP)
225 return sprintf(buf, "%lld\n", value);
228 static ssize_t atk_name_show(struct device *dev,
229 struct device_attribute *attr, char *buf)
231 return sprintf(buf, "atk0110\n");
233 static struct device_attribute atk_name_attr =
234 __ATTR(name, 0444, atk_name_show, NULL);
236 static void atk_init_attribute(struct device_attribute *attr, char *name,
237 sysfs_show_func show)
239 attr->attr.name = name;
240 attr->attr.mode = 0444;
246 static union acpi_object *atk_get_pack_member(struct atk_data *data,
247 union acpi_object *pack,
248 enum atk_pack_member m)
250 bool old_if = data->old_interface;
254 case HWMON_PACK_FLAGS:
255 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS;
257 case HWMON_PACK_NAME:
258 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME;
260 case HWMON_PACK_LIMIT1:
261 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 :
262 _HWMON_NEW_PACK_LIMIT1;
264 case HWMON_PACK_LIMIT2:
265 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 :
266 _HWMON_NEW_PACK_LIMIT2;
268 case HWMON_PACK_ENABLE:
269 offset = old_if ? _HWMON_OLD_PACK_ENABLE :
270 _HWMON_NEW_PACK_ENABLE;
276 return &pack->package.elements[offset];
280 /* New package format is:
282 * class - used for de-muxing the request to the correct GITn
283 * type (volt, temp, fan)
285 * sensor id - used for de-muxing the request _inside_ the GITn
293 * The old package has the same format but it's missing the two unknown fields.
295 static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj)
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;
303 if (obj->type != ACPI_TYPE_PACKAGE) {
304 dev_warn(dev, "Invalid type: %d\n", obj->type);
308 if (obj->package.count != expected_size) {
309 dev_warn(dev, "Invalid package size: %d, expected: %d\n",
310 obj->package.count, expected_size);
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);
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);
326 /* Don't check... we don't know what they're useful for anyway */
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);
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);
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);
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);
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);
359 atk_print_sensor(data, obj);
365 static char const *atk_sensor_type(union acpi_object *flags)
367 u64 type = flags->integer.value & ATK_TYPE_MASK;
371 case HWMON_TYPE_VOLT:
374 case HWMON_TYPE_TEMP:
375 what = "temperature";
389 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
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;
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);
406 what = atk_sensor_type(flags);
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");
416 static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
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;
425 switch (sensor->type) {
426 case HWMON_TYPE_VOLT:
427 method = data->rvlt_handle;
429 case HWMON_TYPE_TEMP:
430 method = data->rtmp_handle;
433 method = data->rfan_handle;
439 id.type = ACPI_TYPE_INTEGER;
440 id.integer.value = sensor->id;
443 params.pointer = &id;
445 status = acpi_evaluate_integer(method, NULL, ¶ms, value);
446 if (status != AE_OK) {
447 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
448 acpi_format_exception(status));
455 static union acpi_object *atk_ggrp(struct atk_data *data, u16 mux)
457 struct device *dev = &data->acpi_dev->dev;
458 struct acpi_buffer buf;
460 struct acpi_object_list params;
461 union acpi_object id;
462 union acpi_object *pack;
464 id.type = ACPI_TYPE_INTEGER;
465 id.integer.value = mux;
467 params.pointer = &id;
469 buf.length = ACPI_ALLOCATE_BUFFER;
470 ret = acpi_evaluate_object(data->enumerate_handle, NULL, ¶ms, &buf);
472 dev_err(dev, "GGRP[%#x] ACPI exception: %s\n", mux,
473 acpi_format_exception(ret));
474 return ERR_PTR(-EIO);
477 if (pack->type != ACPI_TYPE_PACKAGE) {
478 /* Execution was successful, but the id was not found */
480 return ERR_PTR(-ENOENT);
483 if (pack->package.count < 1) {
484 dev_err(dev, "GGRP[%#x] package is too small\n", mux);
486 return ERR_PTR(-EIO);
491 static union acpi_object *atk_gitm(struct atk_data *data, u64 id)
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;
505 tmp.type = ACPI_TYPE_BUFFER;
506 tmp.buffer.pointer = (u8 *)&buf;
507 tmp.buffer.length = sizeof(buf);
510 params.pointer = (void *)&tmp;
512 ret.length = ACPI_ALLOCATE_BUFFER;
513 status = acpi_evaluate_object_typed(data->read_handle, NULL, ¶ms,
514 &ret, ACPI_TYPE_BUFFER);
515 if (status != AE_OK) {
516 dev_warn(dev, "GITM[%#llx] ACPI exception: %s\n", id,
517 acpi_format_exception(status));
518 return ERR_PTR(-EIO);
523 if (obj->buffer.length < 8) {
524 dev_warn(dev, "Unexpected ASBF length: %u\n",
527 return ERR_PTR(-EIO);
532 static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
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;
540 obj = atk_gitm(data, sensor->id);
544 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer;
545 if (buf->flags == 0) {
546 /* The reading is not valid, possible causes:
548 * - enumeration was FUBAR (and we didn't notice)
550 dev_warn(dev, "Read failed, sensor = %#llx\n", sensor->id);
561 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
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);
570 err = atk_read_value_new(sensor, value);
572 sensor->is_valid = true;
573 sensor->last_updated = jiffies;
574 sensor->cached_value = *value;
576 *value = sensor->cached_value;
583 static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
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;
600 if (obj->type != ACPI_TYPE_PACKAGE) {
602 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
607 err = validate_hwmon_pack(data, obj);
611 /* Ok, we have a valid hwmon package */
612 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
616 case HWMON_TYPE_VOLT:
620 num = &data->voltage_count;
623 case HWMON_TYPE_TEMP:
626 limit2_name = "crit";
627 num = &data->temperature_count;
634 num = &data->fan_count;
638 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
642 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
643 if (!enable->integer.value)
644 /* sensor is disabled */
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);
652 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
656 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
657 if (!sensor->acpi_name) {
662 INIT_LIST_HEAD(&sensor->list);
665 sensor->id = flags->integer.value;
666 sensor->limit1 = limit1->integer.value;
667 if (data->old_interface)
668 sensor->limit2 = limit2->integer.value;
670 /* The upper limit is expressed as delta from lower limit */
671 sensor->limit2 = sensor->limit1 + limit2->integer.value;
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,
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,
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,
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,
697 list_add(&sensor->list, &data->sensor_list);
702 kfree(sensor->acpi_name);
707 static int atk_enumerate_old_hwmon(struct atk_data *data)
709 struct device *dev = &data->acpi_dev->dev;
710 struct acpi_buffer buf;
711 union acpi_object *pack;
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));
728 for (i = 1; i < pack->package.count; i++) {
729 union acpi_object *obj = &pack->package.elements[i];
731 ret = atk_add_sensor(data, obj);
735 ACPI_FREE(buf.pointer);
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));
750 for (i = 1; i < pack->package.count; i++) {
751 union acpi_object *obj = &pack->package.elements[i];
753 ret = atk_add_sensor(data, obj);
757 ACPI_FREE(buf.pointer);
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));
772 for (i = 1; i < pack->package.count; i++) {
773 union acpi_object *obj = &pack->package.elements[i];
775 ret = atk_add_sensor(data, obj);
779 ACPI_FREE(buf.pointer);
783 atk_free_sensors(data);
787 static int atk_enumerate_new_hwmon(struct atk_data *data)
789 struct device *dev = &data->acpi_dev->dev;
790 union acpi_object *pack;
794 dev_dbg(dev, "Enumerating hwmon sensors\n");
796 pack = atk_ggrp(data, ATK_MUX_HWMON);
798 return PTR_ERR(pack);
800 for (i = 0; i < pack->package.count; i++) {
801 union acpi_object *obj = &pack->package.elements[i];
803 atk_add_sensor(data, obj);
806 err = data->voltage_count + data->temperature_count + data->fan_count;
812 static int atk_create_files(struct atk_data *data)
814 struct atk_sensor_data *s;
817 list_for_each_entry(s, &data->sensor_list, list) {
818 err = device_create_file(data->hwmon_dev, &s->input_attr);
821 err = device_create_file(data->hwmon_dev, &s->label_attr);
824 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
827 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
832 err = device_create_file(data->hwmon_dev, &atk_name_attr);
837 static void atk_remove_files(struct atk_data *data)
839 struct atk_sensor_data *s;
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);
847 device_remove_file(data->hwmon_dev, &atk_name_attr);
850 static void atk_free_sensors(struct atk_data *data)
852 struct list_head *head = &data->sensor_list;
853 struct atk_sensor_data *s, *tmp;
855 list_for_each_entry_safe(s, tmp, head, list) {
861 static int atk_register_hwmon(struct atk_data *data)
863 struct device *dev = &data->acpi_dev->dev;
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);
871 dev_dbg(dev, "populating sysfs directory\n");
872 err = atk_create_files(data);
878 /* Cleanup the registered files */
879 atk_remove_files(data);
880 hwmon_device_unregister(data->hwmon_dev);
884 static int atk_check_old_if(struct atk_data *data)
886 struct device *dev = &data->acpi_dev->dev;
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));
897 data->rtmp_handle = ret;
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));
906 data->rvlt_handle = ret;
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));
915 data->rfan_handle = ret;
920 static int atk_check_new_if(struct atk_data *data)
922 struct device *dev = &data->acpi_dev->dev;
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));
933 data->enumerate_handle = ret;
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));
942 data->read_handle = ret;
947 static int atk_add(struct acpi_device *device)
951 struct acpi_buffer buf;
952 union acpi_object *obj;
953 struct atk_data *data;
955 dev_dbg(&device->dev, "adding...\n");
957 data = kzalloc(sizeof(*data), GFP_KERNEL);
961 data->acpi_dev = device;
962 data->atk_handle = device->handle;
963 INIT_LIST_HEAD(&data->sensor_list);
965 buf.length = ACPI_ALLOCATE_BUFFER;
966 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
967 &buf, ACPI_TYPE_PACKAGE);
969 dev_dbg(&device->dev, "atk: method MBIF not found\n");
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);
980 ACPI_FREE(buf.pointer);
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.
987 err = atk_check_old_if(data);
989 dev_dbg(&device->dev, "Using old hwmon interface\n");
990 data->old_interface = true;
992 err = atk_check_new_if(data);
996 dev_dbg(&device->dev, "Using new hwmon interface\n");
997 data->old_interface = false;
1000 if (data->old_interface)
1001 err = atk_enumerate_old_hwmon(data);
1003 err = atk_enumerate_new_hwmon(data);
1007 dev_info(&device->dev,
1008 "No usable sensor detected, bailing out\n");
1013 err = atk_register_hwmon(data);
1017 device->driver_data = data;
1020 atk_free_sensors(data);
1026 static int atk_remove(struct acpi_device *device, int type)
1028 struct atk_data *data = device->driver_data;
1029 dev_dbg(&device->dev, "removing...\n");
1031 device->driver_data = NULL;
1033 atk_remove_files(data);
1034 atk_free_sensors(data);
1035 hwmon_device_unregister(data->hwmon_dev);
1042 static int __init atk0110_init(void)
1046 ret = acpi_bus_register_driver(&atk_driver);
1048 pr_info("atk: acpi_bus_register_driver failed: %d\n", ret);
1053 static void __exit atk0110_exit(void)
1055 acpi_bus_unregister_driver(&atk_driver);
1058 module_init(atk0110_init);
1059 module_exit(atk0110_exit);
1061 MODULE_LICENSE("GPL");