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 struct atk_acpi_buffer_u64 {
133 union acpi_object buf;
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);
143 static struct acpi_driver atk_driver = {
149 .remove = atk_remove,
153 #define input_to_atk_sensor(attr) \
154 container_of(attr, struct atk_sensor_data, input_attr)
156 #define label_to_atk_sensor(attr) \
157 container_of(attr, struct atk_sensor_data, label_attr)
159 #define limit1_to_atk_sensor(attr) \
160 container_of(attr, struct atk_sensor_data, limit1_attr)
162 #define limit2_to_atk_sensor(attr) \
163 container_of(attr, struct atk_sensor_data, limit2_attr)
165 static ssize_t atk_input_show(struct device *dev,
166 struct device_attribute *attr, char *buf)
168 struct atk_sensor_data *s = input_to_atk_sensor(attr);
172 err = atk_read_value(s, &value);
176 if (s->type == HWMON_TYPE_TEMP)
177 /* ACPI returns decidegree */
180 return sprintf(buf, "%llu\n", value);
183 static ssize_t atk_label_show(struct device *dev,
184 struct device_attribute *attr, char *buf)
186 struct atk_sensor_data *s = label_to_atk_sensor(attr);
188 return sprintf(buf, "%s\n", s->acpi_name);
191 static ssize_t atk_limit1_show(struct device *dev,
192 struct device_attribute *attr, char *buf)
194 struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
195 u64 value = s->limit1;
197 if (s->type == HWMON_TYPE_TEMP)
200 return sprintf(buf, "%lld\n", value);
203 static ssize_t atk_limit2_show(struct device *dev,
204 struct device_attribute *attr, char *buf)
206 struct atk_sensor_data *s = limit2_to_atk_sensor(attr);
207 u64 value = s->limit2;
209 if (s->type == HWMON_TYPE_TEMP)
212 return sprintf(buf, "%lld\n", value);
215 static ssize_t atk_name_show(struct device *dev,
216 struct device_attribute *attr, char *buf)
218 return sprintf(buf, "atk0110\n");
220 static struct device_attribute atk_name_attr =
221 __ATTR(name, 0444, atk_name_show, NULL);
223 static void atk_init_attribute(struct device_attribute *attr, char *name,
224 sysfs_show_func show)
226 attr->attr.name = name;
227 attr->attr.mode = 0444;
233 static union acpi_object *atk_get_pack_member(struct atk_data *data,
234 union acpi_object *pack,
235 enum atk_pack_member m)
237 bool old_if = data->old_interface;
241 case HWMON_PACK_FLAGS:
242 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS;
244 case HWMON_PACK_NAME:
245 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME;
247 case HWMON_PACK_LIMIT1:
248 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 :
249 _HWMON_NEW_PACK_LIMIT1;
251 case HWMON_PACK_LIMIT2:
252 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 :
253 _HWMON_NEW_PACK_LIMIT2;
255 case HWMON_PACK_ENABLE:
256 offset = old_if ? _HWMON_OLD_PACK_ENABLE :
257 _HWMON_NEW_PACK_ENABLE;
263 return &pack->package.elements[offset];
267 /* New package format is:
269 * class - used for de-muxing the request to the correct GITn
270 * type (volt, temp, fan)
272 * sensor id - used for de-muxing the request _inside_ the GITn
280 * The old package has the same format but it's missing the two unknown fields.
282 static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj)
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;
290 if (obj->type != ACPI_TYPE_PACKAGE) {
291 dev_warn(dev, "Invalid type: %d\n", obj->type);
295 if (obj->package.count != expected_size) {
296 dev_warn(dev, "Invalid package size: %d, expected: %d\n",
297 obj->package.count, expected_size);
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);
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);
313 /* Don't check... we don't know what they're useful for anyway */
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);
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);
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);
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);
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);
346 atk_print_sensor(data, obj);
352 static char const *atk_sensor_type(union acpi_object *flags)
354 u64 type = flags->integer.value & ATK_TYPE_MASK;
358 case HWMON_TYPE_VOLT:
361 case HWMON_TYPE_TEMP:
362 what = "temperature";
376 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
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;
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);
393 what = atk_sensor_type(flags);
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");
403 static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
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;
412 switch (sensor->type) {
413 case HWMON_TYPE_VOLT:
414 method = data->rvlt_handle;
416 case HWMON_TYPE_TEMP:
417 method = data->rtmp_handle;
420 method = data->rfan_handle;
426 id.type = ACPI_TYPE_INTEGER;
427 id.integer.value = sensor->id;
430 params.pointer = &id;
432 status = acpi_evaluate_integer(method, NULL, ¶ms, value);
433 if (status != AE_OK) {
434 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
435 acpi_format_exception(status));
442 static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
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;
452 id.type = ACPI_TYPE_INTEGER;
453 id.integer.value = sensor->id;
456 params.pointer = &id;
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);
464 status = acpi_evaluate_object_typed(data->read_handle, NULL, ¶ms,
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));
472 /* Return buffer format:
473 * [0-3] "value" is valid flag
476 if (!(tmp.value & 0xffffffff)) {
477 /* The reading is not valid, possible causes:
479 * - enumeration was FUBAR (and we didn't notice)
481 dev_info(dev, "Failure: %#llx\n", tmp.value);
485 *value = (tmp.value & 0xffffffff00000000ULL) >> 32;
490 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
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);
499 err = atk_read_value_new(sensor, value);
501 sensor->is_valid = true;
502 sensor->last_updated = jiffies;
503 sensor->cached_value = *value;
505 *value = sensor->cached_value;
512 static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
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;
529 if (obj->type != ACPI_TYPE_PACKAGE) {
531 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
536 err = validate_hwmon_pack(data, obj);
540 /* Ok, we have a valid hwmon package */
541 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
545 case HWMON_TYPE_VOLT:
549 num = &data->voltage_count;
552 case HWMON_TYPE_TEMP:
555 limit2_name = "crit";
556 num = &data->temperature_count;
563 num = &data->fan_count;
567 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
571 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
572 if (!enable->integer.value)
573 /* sensor is disabled */
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);
581 sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
585 sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
586 if (!sensor->acpi_name) {
591 INIT_LIST_HEAD(&sensor->list);
594 sensor->id = flags->integer.value;
595 sensor->limit1 = limit1->integer.value;
596 sensor->limit2 = limit2->integer.value;
598 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
599 "%s%d_input", base_name, start + *num);
600 atk_init_attribute(&sensor->input_attr,
601 sensor->input_attr_name,
604 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
605 "%s%d_label", base_name, start + *num);
606 atk_init_attribute(&sensor->label_attr,
607 sensor->label_attr_name,
610 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
611 "%s%d_%s", base_name, start + *num, limit1_name);
612 atk_init_attribute(&sensor->limit1_attr,
613 sensor->limit1_attr_name,
616 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
617 "%s%d_%s", base_name, start + *num, limit2_name);
618 atk_init_attribute(&sensor->limit2_attr,
619 sensor->limit2_attr_name,
622 list_add(&sensor->list, &data->sensor_list);
627 kfree(sensor->acpi_name);
632 static int atk_enumerate_old_hwmon(struct atk_data *data)
634 struct device *dev = &data->acpi_dev->dev;
635 struct acpi_buffer buf;
636 union acpi_object *pack;
642 buf.length = ACPI_ALLOCATE_BUFFER;
643 status = acpi_evaluate_object_typed(data->atk_handle,
644 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
645 if (status != AE_OK) {
646 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
647 acpi_format_exception(status));
653 for (i = 1; i < pack->package.count; i++) {
654 union acpi_object *obj = &pack->package.elements[i];
656 ret = atk_add_sensor(data, obj);
660 ACPI_FREE(buf.pointer);
663 buf.length = ACPI_ALLOCATE_BUFFER;
664 status = acpi_evaluate_object_typed(data->atk_handle,
665 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
666 if (status != AE_OK) {
667 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
668 acpi_format_exception(status));
675 for (i = 1; i < pack->package.count; i++) {
676 union acpi_object *obj = &pack->package.elements[i];
678 ret = atk_add_sensor(data, obj);
682 ACPI_FREE(buf.pointer);
685 buf.length = ACPI_ALLOCATE_BUFFER;
686 status = acpi_evaluate_object_typed(data->atk_handle,
687 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
688 if (status != AE_OK) {
689 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
690 acpi_format_exception(status));
697 for (i = 1; i < pack->package.count; i++) {
698 union acpi_object *obj = &pack->package.elements[i];
700 ret = atk_add_sensor(data, obj);
704 ACPI_FREE(buf.pointer);
708 atk_free_sensors(data);
712 static int atk_enumerate_new_hwmon(struct atk_data *data)
714 struct device *dev = &data->acpi_dev->dev;
715 struct acpi_buffer buf;
717 struct acpi_object_list params;
718 union acpi_object id;
719 union acpi_object *pack;
723 dev_dbg(dev, "Enumerating hwmon sensors\n");
725 id.type = ACPI_TYPE_INTEGER;
726 id.integer.value = ATK_MUX_HWMON;
728 params.pointer = &id;
730 buf.length = ACPI_ALLOCATE_BUFFER;
731 ret = acpi_evaluate_object_typed(data->enumerate_handle, NULL, ¶ms,
732 &buf, ACPI_TYPE_PACKAGE);
734 dev_warn(dev, METHOD_ENUMERATE ": ACPI exception: %s\n",
735 acpi_format_exception(ret));
739 /* Result must be a package */
742 if (pack->package.count < 1) {
743 dev_dbg(dev, "%s: hwmon package is too small: %d\n", __func__,
744 pack->package.count);
749 for (i = 0; i < pack->package.count; i++) {
750 union acpi_object *obj = &pack->package.elements[i];
752 atk_add_sensor(data, obj);
755 err = data->voltage_count + data->temperature_count + data->fan_count;
758 ACPI_FREE(buf.pointer);
762 static int atk_create_files(struct atk_data *data)
764 struct atk_sensor_data *s;
767 list_for_each_entry(s, &data->sensor_list, list) {
768 err = device_create_file(data->hwmon_dev, &s->input_attr);
771 err = device_create_file(data->hwmon_dev, &s->label_attr);
774 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
777 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
782 err = device_create_file(data->hwmon_dev, &atk_name_attr);
787 static void atk_remove_files(struct atk_data *data)
789 struct atk_sensor_data *s;
791 list_for_each_entry(s, &data->sensor_list, list) {
792 device_remove_file(data->hwmon_dev, &s->input_attr);
793 device_remove_file(data->hwmon_dev, &s->label_attr);
794 device_remove_file(data->hwmon_dev, &s->limit1_attr);
795 device_remove_file(data->hwmon_dev, &s->limit2_attr);
797 device_remove_file(data->hwmon_dev, &atk_name_attr);
800 static void atk_free_sensors(struct atk_data *data)
802 struct list_head *head = &data->sensor_list;
803 struct atk_sensor_data *s, *tmp;
805 list_for_each_entry_safe(s, tmp, head, list) {
811 static int atk_register_hwmon(struct atk_data *data)
813 struct device *dev = &data->acpi_dev->dev;
816 dev_dbg(dev, "registering hwmon device\n");
817 data->hwmon_dev = hwmon_device_register(dev);
818 if (IS_ERR(data->hwmon_dev))
819 return PTR_ERR(data->hwmon_dev);
821 dev_dbg(dev, "populating sysfs directory\n");
822 err = atk_create_files(data);
828 /* Cleanup the registered files */
829 atk_remove_files(data);
830 hwmon_device_unregister(data->hwmon_dev);
834 static int atk_check_old_if(struct atk_data *data)
836 struct device *dev = &data->acpi_dev->dev;
840 /* RTMP: read temperature */
841 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
842 if (status != AE_OK) {
843 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
844 acpi_format_exception(status));
847 data->rtmp_handle = ret;
849 /* RVLT: read voltage */
850 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
851 if (status != AE_OK) {
852 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
853 acpi_format_exception(status));
856 data->rvlt_handle = ret;
858 /* RFAN: read fan status */
859 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
860 if (status != AE_OK) {
861 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
862 acpi_format_exception(status));
865 data->rfan_handle = ret;
870 static int atk_check_new_if(struct atk_data *data)
872 struct device *dev = &data->acpi_dev->dev;
877 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
878 if (status != AE_OK) {
879 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
880 acpi_format_exception(status));
883 data->enumerate_handle = ret;
885 /* De-multiplexer (read) */
886 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
887 if (status != AE_OK) {
888 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
889 acpi_format_exception(status));
892 data->read_handle = ret;
897 static int atk_add(struct acpi_device *device)
901 struct acpi_buffer buf;
902 union acpi_object *obj;
903 struct atk_data *data;
905 dev_dbg(&device->dev, "adding...\n");
907 data = kzalloc(sizeof(*data), GFP_KERNEL);
911 data->acpi_dev = device;
912 data->atk_handle = device->handle;
913 INIT_LIST_HEAD(&data->sensor_list);
915 buf.length = ACPI_ALLOCATE_BUFFER;
916 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
917 &buf, ACPI_TYPE_PACKAGE);
919 dev_dbg(&device->dev, "atk: method MBIF not found\n");
925 if (obj->package.count >= 2 &&
926 obj->package.elements[1].type == ACPI_TYPE_STRING) {
927 dev_dbg(&device->dev, "board ID = %s\n",
928 obj->package.elements[1].string.pointer);
930 ACPI_FREE(buf.pointer);
932 /* Check for hwmon methods: first check "old" style methods; note that
933 * both may be present: in this case we stick to the old interface;
934 * analysis of multiple DSDTs indicates that when both interfaces
935 * are present the new one (GGRP/GITM) is not functional.
937 err = atk_check_old_if(data);
939 dev_dbg(&device->dev, "Using old hwmon interface\n");
940 data->old_interface = true;
942 err = atk_check_new_if(data);
946 dev_dbg(&device->dev, "Using new hwmon interface\n");
947 data->old_interface = false;
950 if (data->old_interface)
951 err = atk_enumerate_old_hwmon(data);
953 err = atk_enumerate_new_hwmon(data);
957 dev_info(&device->dev,
958 "No usable sensor detected, bailing out\n");
963 err = atk_register_hwmon(data);
967 device->driver_data = data;
970 atk_free_sensors(data);
976 static int atk_remove(struct acpi_device *device, int type)
978 struct atk_data *data = device->driver_data;
979 dev_dbg(&device->dev, "removing...\n");
981 device->driver_data = NULL;
983 atk_remove_files(data);
984 atk_free_sensors(data);
985 hwmon_device_unregister(data->hwmon_dev);
992 static int __init atk0110_init(void)
996 ret = acpi_bus_register_driver(&atk_driver);
998 pr_info("atk: acpi_bus_register_driver failed: %d\n", ret);
1003 static void __exit atk0110_exit(void)
1005 acpi_bus_unregister_driver(&atk_driver);
1008 module_init(atk0110_init);
1009 module_exit(atk0110_exit);
1011 MODULE_LICENSE("GPL");