diff options
Diffstat (limited to 'drivers/hwmon/asus_atk0110.c')
| -rw-r--r-- | drivers/hwmon/asus_atk0110.c | 1394 |
1 files changed, 1394 insertions, 0 deletions
diff --git a/drivers/hwmon/asus_atk0110.c b/drivers/hwmon/asus_atk0110.c new file mode 100644 index 000000000..ff64a39d5 --- /dev/null +++ b/drivers/hwmon/asus_atk0110.c @@ -0,0 +1,1394 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2007-2009 Luca Tettamanti <kronos.it@gmail.com> + * + * See COPYING in the top level directory of the kernel tree. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/debugfs.h> +#include <linux/kernel.h> +#include <linux/hwmon.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/dmi.h> +#include <linux/jiffies.h> +#include <linux/err.h> +#include <linux/acpi.h> + +#define ATK_HID "ATK0110" + +static bool new_if; +module_param(new_if, bool, 0); +MODULE_PARM_DESC(new_if, "Override detection heuristic and force the use of the new ATK0110 interface"); + +static const struct dmi_system_id __initconst atk_force_new_if[] = { + { + /* Old interface has broken MCH temp monitoring */ + .ident = "Asus Sabertooth X58", + .matches = { + DMI_MATCH(DMI_BOARD_NAME, "SABERTOOTH X58") + } + }, { + /* Old interface reads the same sensor for fan0 and fan1 */ + .ident = "Asus M5A78L", + .matches = { + DMI_MATCH(DMI_BOARD_NAME, "M5A78L") + } + }, + { } +}; + +/* + * Minimum time between readings, enforced in order to avoid + * hogging the CPU. + */ +#define CACHE_TIME HZ + +#define BOARD_ID "MBIF" +#define METHOD_ENUMERATE "GGRP" +#define METHOD_READ "GITM" +#define METHOD_WRITE "SITM" +#define METHOD_OLD_READ_TMP "RTMP" +#define METHOD_OLD_READ_VLT "RVLT" +#define METHOD_OLD_READ_FAN "RFAN" +#define METHOD_OLD_ENUM_TMP "TSIF" +#define METHOD_OLD_ENUM_VLT "VSIF" +#define METHOD_OLD_ENUM_FAN "FSIF" + +#define ATK_MUX_HWMON 0x00000006ULL +#define ATK_MUX_MGMT 0x00000011ULL + +#define ATK_CLASS_MASK 0xff000000ULL +#define ATK_CLASS_FREQ_CTL 0x03000000ULL +#define ATK_CLASS_FAN_CTL 0x04000000ULL +#define ATK_CLASS_HWMON 0x06000000ULL +#define ATK_CLASS_MGMT 0x11000000ULL + +#define ATK_TYPE_MASK 0x00ff0000ULL +#define HWMON_TYPE_VOLT 0x00020000ULL +#define HWMON_TYPE_TEMP 0x00030000ULL +#define HWMON_TYPE_FAN 0x00040000ULL + +#define ATK_ELEMENT_ID_MASK 0x0000ffffULL + +#define ATK_EC_ID 0x11060004ULL + +enum atk_pack_member { + HWMON_PACK_FLAGS, + HWMON_PACK_NAME, + HWMON_PACK_LIMIT1, + HWMON_PACK_LIMIT2, + HWMON_PACK_ENABLE +}; + +/* New package format */ +#define _HWMON_NEW_PACK_SIZE 7 +#define _HWMON_NEW_PACK_FLAGS 0 +#define _HWMON_NEW_PACK_NAME 1 +#define _HWMON_NEW_PACK_UNK1 2 +#define _HWMON_NEW_PACK_UNK2 3 +#define _HWMON_NEW_PACK_LIMIT1 4 +#define _HWMON_NEW_PACK_LIMIT2 5 +#define _HWMON_NEW_PACK_ENABLE 6 + +/* Old package format */ +#define _HWMON_OLD_PACK_SIZE 5 +#define _HWMON_OLD_PACK_FLAGS 0 +#define _HWMON_OLD_PACK_NAME 1 +#define _HWMON_OLD_PACK_LIMIT1 2 +#define _HWMON_OLD_PACK_LIMIT2 3 +#define _HWMON_OLD_PACK_ENABLE 4 + + +struct atk_data { + struct device *hwmon_dev; + acpi_handle atk_handle; + struct acpi_device *acpi_dev; + + bool old_interface; + + /* old interface */ + acpi_handle rtmp_handle; + acpi_handle rvlt_handle; + acpi_handle rfan_handle; + /* new interface */ + acpi_handle enumerate_handle; + acpi_handle read_handle; + acpi_handle write_handle; + + bool disable_ec; + + int voltage_count; + int temperature_count; + int fan_count; + struct list_head sensor_list; + struct attribute_group attr_group; + const struct attribute_group *attr_groups[2]; + + struct { + struct dentry *root; + u32 id; + } debugfs; +}; + + +typedef ssize_t (*sysfs_show_func)(struct device *dev, + struct device_attribute *attr, char *buf); + +static const struct acpi_device_id atk_ids[] = { + {ATK_HID, 0}, + {"", 0}, +}; +MODULE_DEVICE_TABLE(acpi, atk_ids); + +#define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */ + +struct atk_sensor_data { + struct list_head list; + struct atk_data *data; + struct device_attribute label_attr; + struct device_attribute input_attr; + struct device_attribute limit1_attr; + struct device_attribute limit2_attr; + char label_attr_name[ATTR_NAME_SIZE]; + char input_attr_name[ATTR_NAME_SIZE]; + char limit1_attr_name[ATTR_NAME_SIZE]; + char limit2_attr_name[ATTR_NAME_SIZE]; + u64 id; + u64 type; + u64 limit1; + u64 limit2; + u64 cached_value; + unsigned long last_updated; /* in jiffies */ + bool is_valid; + char const *acpi_name; +}; + +/* + * Return buffer format: + * [0-3] "value" is valid flag + * [4-7] value + * [8- ] unknown stuff on newer mobos + */ +struct atk_acpi_ret_buffer { + u32 flags; + u32 value; + u8 data[]; +}; + +/* Input buffer used for GITM and SITM methods */ +struct atk_acpi_input_buf { + u32 id; + u32 param1; + u32 param2; +}; + +static int atk_add(struct acpi_device *device); +static int atk_remove(struct acpi_device *device); +static void atk_print_sensor(struct atk_data *data, union acpi_object *obj); +static int atk_read_value(struct atk_sensor_data *sensor, u64 *value); + +static struct acpi_driver atk_driver = { + .name = ATK_HID, + .class = "hwmon", + .ids = atk_ids, + .ops = { + .add = atk_add, + .remove = atk_remove, + }, +}; + +#define input_to_atk_sensor(attr) \ + container_of(attr, struct atk_sensor_data, input_attr) + +#define label_to_atk_sensor(attr) \ + container_of(attr, struct atk_sensor_data, label_attr) + +#define limit1_to_atk_sensor(attr) \ + container_of(attr, struct atk_sensor_data, limit1_attr) + +#define limit2_to_atk_sensor(attr) \ + container_of(attr, struct atk_sensor_data, limit2_attr) + +static ssize_t atk_input_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct atk_sensor_data *s = input_to_atk_sensor(attr); + u64 value; + int err; + + err = atk_read_value(s, &value); + if (err) + return err; + + if (s->type == HWMON_TYPE_TEMP) + /* ACPI returns decidegree */ + value *= 100; + + return sprintf(buf, "%llu\n", value); +} + +static ssize_t atk_label_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct atk_sensor_data *s = label_to_atk_sensor(attr); + + return sprintf(buf, "%s\n", s->acpi_name); +} + +static ssize_t atk_limit1_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct atk_sensor_data *s = limit1_to_atk_sensor(attr); + u64 value = s->limit1; + + if (s->type == HWMON_TYPE_TEMP) + value *= 100; + + return sprintf(buf, "%lld\n", value); +} + +static ssize_t atk_limit2_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct atk_sensor_data *s = limit2_to_atk_sensor(attr); + u64 value = s->limit2; + + if (s->type == HWMON_TYPE_TEMP) + value *= 100; + + return sprintf(buf, "%lld\n", value); +} + +static void atk_init_attribute(struct device_attribute *attr, char *name, + sysfs_show_func show) +{ + sysfs_attr_init(&attr->attr); + attr->attr.name = name; + attr->attr.mode = 0444; + attr->show = show; + attr->store = NULL; +} + + +static union acpi_object *atk_get_pack_member(struct atk_data *data, + union acpi_object *pack, + enum atk_pack_member m) +{ + bool old_if = data->old_interface; + int offset; + + switch (m) { + case HWMON_PACK_FLAGS: + offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS; + break; + case HWMON_PACK_NAME: + offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME; + break; + case HWMON_PACK_LIMIT1: + offset = old_if ? _HWMON_OLD_PACK_LIMIT1 : + _HWMON_NEW_PACK_LIMIT1; + break; + case HWMON_PACK_LIMIT2: + offset = old_if ? _HWMON_OLD_PACK_LIMIT2 : + _HWMON_NEW_PACK_LIMIT2; + break; + case HWMON_PACK_ENABLE: + offset = old_if ? _HWMON_OLD_PACK_ENABLE : + _HWMON_NEW_PACK_ENABLE; + break; + default: + return NULL; + } + + return &pack->package.elements[offset]; +} + + +/* + * New package format is: + * - flag (int) + * class - used for de-muxing the request to the correct GITn + * type (volt, temp, fan) + * sensor id | + * sensor id - used for de-muxing the request _inside_ the GITn + * - name (str) + * - unknown (int) + * - unknown (int) + * - limit1 (int) + * - limit2 (int) + * - enable (int) + * + * The old package has the same format but it's missing the two unknown fields. + */ +static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj) +{ + struct device *dev = &data->acpi_dev->dev; + union acpi_object *tmp; + bool old_if = data->old_interface; + int const expected_size = old_if ? _HWMON_OLD_PACK_SIZE : + _HWMON_NEW_PACK_SIZE; + + if (obj->type != ACPI_TYPE_PACKAGE) { + dev_warn(dev, "Invalid type: %d\n", obj->type); + return -EINVAL; + } + + if (obj->package.count != expected_size) { + dev_warn(dev, "Invalid package size: %d, expected: %d\n", + obj->package.count, expected_size); + return -EINVAL; + } + + tmp = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS); + if (tmp->type != ACPI_TYPE_INTEGER) { + dev_warn(dev, "Invalid type (flag): %d\n", tmp->type); + return -EINVAL; + } + + tmp = atk_get_pack_member(data, obj, HWMON_PACK_NAME); + if (tmp->type != ACPI_TYPE_STRING) { + dev_warn(dev, "Invalid type (name): %d\n", tmp->type); + return -EINVAL; + } + + /* Don't check... we don't know what they're useful for anyway */ +#if 0 + tmp = &obj->package.elements[HWMON_PACK_UNK1]; + if (tmp->type != ACPI_TYPE_INTEGER) { + dev_warn(dev, "Invalid type (unk1): %d\n", tmp->type); + return -EINVAL; + } + + tmp = &obj->package.elements[HWMON_PACK_UNK2]; + if (tmp->type != ACPI_TYPE_INTEGER) { + dev_warn(dev, "Invalid type (unk2): %d\n", tmp->type); + return -EINVAL; + } +#endif + + tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1); + if (tmp->type != ACPI_TYPE_INTEGER) { + dev_warn(dev, "Invalid type (limit1): %d\n", tmp->type); + return -EINVAL; + } + + tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2); + if (tmp->type != ACPI_TYPE_INTEGER) { + dev_warn(dev, "Invalid type (limit2): %d\n", tmp->type); + return -EINVAL; + } + + tmp = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE); + if (tmp->type != ACPI_TYPE_INTEGER) { + dev_warn(dev, "Invalid type (enable): %d\n", tmp->type); + return -EINVAL; + } + + atk_print_sensor(data, obj); + + return 0; +} + +#ifdef DEBUG +static char const *atk_sensor_type(union acpi_object *flags) +{ + u64 type = flags->integer.value & ATK_TYPE_MASK; + char const *what; + + switch (type) { + case HWMON_TYPE_VOLT: + what = "voltage"; + break; + case HWMON_TYPE_TEMP: + what = "temperature"; + break; + case HWMON_TYPE_FAN: + what = "fan"; + break; + default: + what = "unknown"; + break; + } + + return what; +} +#endif + +static void atk_print_sensor(struct atk_data *data, union acpi_object *obj) +{ +#ifdef DEBUG + struct device *dev = &data->acpi_dev->dev; + union acpi_object *flags; + union acpi_object *name; + union acpi_object *limit1; + union acpi_object *limit2; + union acpi_object *enable; + char const *what; + + flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS); + name = atk_get_pack_member(data, obj, HWMON_PACK_NAME); + limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1); + limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2); + enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE); + + what = atk_sensor_type(flags); + + dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what, + flags->integer.value, + name->string.pointer, + limit1->integer.value, limit2->integer.value, + enable->integer.value ? "enabled" : "disabled"); +#endif +} + +static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value) +{ + struct atk_data *data = sensor->data; + struct device *dev = &data->acpi_dev->dev; + struct acpi_object_list params; + union acpi_object id; + acpi_status status; + acpi_handle method; + + switch (sensor->type) { + case HWMON_TYPE_VOLT: + method = data->rvlt_handle; + break; + case HWMON_TYPE_TEMP: + method = data->rtmp_handle; + break; + case HWMON_TYPE_FAN: + method = data->rfan_handle; + break; + default: + return -EINVAL; + } + + id.type = ACPI_TYPE_INTEGER; + id.integer.value = sensor->id; + + params.count = 1; + params.pointer = &id; + + status = acpi_evaluate_integer(method, NULL, ¶ms, value); + if (status != AE_OK) { + dev_warn(dev, "%s: ACPI exception: %s\n", __func__, + acpi_format_exception(status)); + return -EIO; + } + + return 0; +} + +static union acpi_object *atk_ggrp(struct atk_data *data, u16 mux) +{ + struct device *dev = &data->acpi_dev->dev; + struct acpi_buffer buf; + acpi_status ret; + struct acpi_object_list params; + union acpi_object id; + union acpi_object *pack; + + id.type = ACPI_TYPE_INTEGER; + id.integer.value = mux; + params.count = 1; + params.pointer = &id; + + buf.length = ACPI_ALLOCATE_BUFFER; + ret = acpi_evaluate_object(data->enumerate_handle, NULL, ¶ms, &buf); + if (ret != AE_OK) { + dev_err(dev, "GGRP[%#x] ACPI exception: %s\n", mux, + acpi_format_exception(ret)); + return ERR_PTR(-EIO); + } + pack = buf.pointer; + if (pack->type != ACPI_TYPE_PACKAGE) { + /* Execution was successful, but the id was not found */ + ACPI_FREE(pack); + return ERR_PTR(-ENOENT); + } + + if (pack->package.count < 1) { + dev_err(dev, "GGRP[%#x] package is too small\n", mux); + ACPI_FREE(pack); + return ERR_PTR(-EIO); + } + return pack; +} + +static union acpi_object *atk_gitm(struct atk_data *data, u64 id) +{ + struct device *dev = &data->acpi_dev->dev; + struct atk_acpi_input_buf buf; + union acpi_object tmp; + struct acpi_object_list params; + struct acpi_buffer ret; + union acpi_object *obj; + acpi_status status; + + buf.id = id; + buf.param1 = 0; + buf.param2 = 0; + + tmp.type = ACPI_TYPE_BUFFER; + tmp.buffer.pointer = (u8 *)&buf; + tmp.buffer.length = sizeof(buf); + + params.count = 1; + params.pointer = (void *)&tmp; + + ret.length = ACPI_ALLOCATE_BUFFER; + status = acpi_evaluate_object_typed(data->read_handle, NULL, ¶ms, + &ret, ACPI_TYPE_BUFFER); + if (status != AE_OK) { + dev_warn(dev, "GITM[%#llx] ACPI exception: %s\n", id, + acpi_format_exception(status)); + return ERR_PTR(-EIO); + } + obj = ret.pointer; + + /* Sanity check */ + if (obj->buffer.length < 8) { + dev_warn(dev, "Unexpected ASBF length: %u\n", + obj->buffer.length); + ACPI_FREE(obj); + return ERR_PTR(-EIO); + } + return obj; +} + +static union acpi_object *atk_sitm(struct atk_data *data, + struct atk_acpi_input_buf *buf) +{ + struct device *dev = &data->acpi_dev->dev; + struct acpi_object_list params; + union acpi_object tmp; + struct acpi_buffer ret; + union acpi_object *obj; + acpi_status status; + + tmp.type = ACPI_TYPE_BUFFER; + tmp.buffer.pointer = (u8 *)buf; + tmp.buffer.length = sizeof(*buf); + + params.count = 1; + params.pointer = &tmp; + + ret.length = ACPI_ALLOCATE_BUFFER; + status = acpi_evaluate_object_typed(data->write_handle, NULL, ¶ms, + &ret, ACPI_TYPE_BUFFER); + if (status != AE_OK) { + dev_warn(dev, "SITM[%#x] ACPI exception: %s\n", buf->id, + acpi_format_exception(status)); + return ERR_PTR(-EIO); + } + obj = ret.pointer; + + /* Sanity check */ + if (obj->buffer.length < 8) { + dev_warn(dev, "Unexpected ASBF length: %u\n", + obj->buffer.length); + ACPI_FREE(obj); + return ERR_PTR(-EIO); + } + return obj; +} + +static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value) +{ + struct atk_data *data = sensor->data; + struct device *dev = &data->acpi_dev->dev; + union acpi_object *obj; + struct atk_acpi_ret_buffer *buf; + int err = 0; + + obj = atk_gitm(data, sensor->id); + if (IS_ERR(obj)) + return PTR_ERR(obj); + + buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer; + if (buf->flags == 0) { + /* + * The reading is not valid, possible causes: + * - sensor failure + * - enumeration was FUBAR (and we didn't notice) + */ + dev_warn(dev, "Read failed, sensor = %#llx\n", sensor->id); + err = -EIO; + goto out; + } + + *value = buf->value; +out: + ACPI_FREE(obj); + return err; +} + +static int atk_read_value(struct atk_sensor_data *sensor, u64 *value) +{ + int err; + + if (!sensor->is_valid || + time_after(jiffies, sensor->last_updated + CACHE_TIME)) { + if (sensor->data->old_interface) + err = atk_read_value_old(sensor, value); + else + err = atk_read_value_new(sensor, value); + + if (err) + return err; + + sensor->is_valid = true; + sensor->last_updated = jiffies; + sensor->cached_value = *value; + } else { + *value = sensor->cached_value; + err = 0; + } + + return err; +} + +#ifdef CONFIG_DEBUG_FS +static int atk_debugfs_gitm_get(void *p, u64 *val) +{ + struct atk_data *data = p; + union acpi_object *ret; + struct atk_acpi_ret_buffer *buf; + int err = 0; + + if (!data->read_handle) + return -ENODEV; + + if (!data->debugfs.id) + return -EINVAL; + + ret = atk_gitm(data, data->debugfs.id); + if (IS_ERR(ret)) + return PTR_ERR(ret); + + buf = (struct atk_acpi_ret_buffer *)ret->buffer.pointer; + if (buf->flags) + *val = buf->value; + else + err = -EIO; + + ACPI_FREE(ret); + return err; +} + +DEFINE_DEBUGFS_ATTRIBUTE(atk_debugfs_gitm, atk_debugfs_gitm_get, NULL, + "0x%08llx\n"); + +static int atk_acpi_print(char *buf, size_t sz, union acpi_object *obj) +{ + int ret = 0; + + switch (obj->type) { + case ACPI_TYPE_INTEGER: + ret = snprintf(buf, sz, "0x%08llx\n", obj->integer.value); + break; + case ACPI_TYPE_STRING: + ret = snprintf(buf, sz, "%s\n", obj->string.pointer); + break; + } + + return ret; +} + +static void atk_pack_print(char *buf, size_t sz, union acpi_object *pack) +{ + int ret; + int i; + + for (i = 0; i < pack->package.count; i++) { + union acpi_object *obj = &pack->package.elements[i]; + + ret = atk_acpi_print(buf, sz, obj); + if (ret >= sz) + break; + buf += ret; + sz -= ret; + } +} + +static int atk_debugfs_ggrp_open(struct inode *inode, struct file *file) +{ + struct atk_data *data = inode->i_private; + char *buf = NULL; + union acpi_object *ret; + u8 cls; + int i; + + if (!data->enumerate_handle) + return -ENODEV; + if (!data->debugfs.id) + return -EINVAL; + + cls = (data->debugfs.id & 0xff000000) >> 24; + ret = atk_ggrp(data, cls); + if (IS_ERR(ret)) + return PTR_ERR(ret); + + for (i = 0; i < ret->package.count; i++) { + union acpi_object *pack = &ret->package.elements[i]; + union acpi_object *id; + + if (pack->type != ACPI_TYPE_PACKAGE) + continue; + if (!pack->package.count) + continue; + id = &pack->package.elements[0]; + if (id->integer.value == data->debugfs.id) { + /* Print the package */ + buf = kzalloc(512, GFP_KERNEL); + if (!buf) { + ACPI_FREE(ret); + return -ENOMEM; + } + atk_pack_print(buf, 512, pack); + break; + } + } + ACPI_FREE(ret); + + if (!buf) + return -EINVAL; + + file->private_data = buf; + + return nonseekable_open(inode, file); +} + +static ssize_t atk_debugfs_ggrp_read(struct file *file, char __user *buf, + size_t count, loff_t *pos) +{ + char *str = file->private_data; + size_t len = strlen(str); + + return simple_read_from_buffer(buf, count, pos, str, len); +} + +static int atk_debugfs_ggrp_release(struct inode *inode, struct file *file) +{ + kfree(file->private_data); + return 0; +} + +static const struct file_operations atk_debugfs_ggrp_fops = { + .read = atk_debugfs_ggrp_read, + .open = atk_debugfs_ggrp_open, + .release = atk_debugfs_ggrp_release, + .llseek = no_llseek, +}; + +static void atk_debugfs_init(struct atk_data *data) +{ + struct dentry *d; + + data->debugfs.id = 0; + + d = debugfs_create_dir("asus_atk0110", NULL); + + debugfs_create_x32("id", 0600, d, &data->debugfs.id); + debugfs_create_file_unsafe("gitm", 0400, d, data, &atk_debugfs_gitm); + debugfs_create_file("ggrp", 0400, d, data, &atk_debugfs_ggrp_fops); + + data->debugfs.root = d; +} + +static void atk_debugfs_cleanup(struct atk_data *data) +{ + debugfs_remove_recursive(data->debugfs.root); +} + +#else /* CONFIG_DEBUG_FS */ + +static void atk_debugfs_init(struct atk_data *data) +{ +} + +static void atk_debugfs_cleanup(struct atk_data *data) +{ +} +#endif + +static int atk_add_sensor(struct atk_data *data, union acpi_object *obj) +{ + struct device *dev = &data->acpi_dev->dev; + union acpi_object *flags; + union acpi_object *name; + union acpi_object *limit1; + union acpi_object *limit2; + union acpi_object *enable; + struct atk_sensor_data *sensor; + char const *base_name; + char const *limit1_name; + char const *limit2_name; + u64 type; + int err; + int *num; + int start; + + if (obj->type != ACPI_TYPE_PACKAGE) { + /* wft is this? */ + dev_warn(dev, "Unknown type for ACPI object: (%d)\n", + obj->type); + return -EINVAL; + } + + err = validate_hwmon_pack(data, obj); + if (err) + return err; + + /* Ok, we have a valid hwmon package */ + type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value + & ATK_TYPE_MASK; + + switch (type) { + case HWMON_TYPE_VOLT: + base_name = "in"; + limit1_name = "min"; + limit2_name = "max"; + num = &data->voltage_count; + start = 0; + break; + case HWMON_TYPE_TEMP: + base_name = "temp"; + limit1_name = "max"; + limit2_name = "crit"; + num = &data->temperature_count; + start = 1; + break; + case HWMON_TYPE_FAN: + base_name = "fan"; + limit1_name = "min"; + limit2_name = "max"; + num = &data->fan_count; + start = 1; + break; + default: + dev_warn(dev, "Unknown sensor type: %#llx\n", type); + return -EINVAL; + } + + enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE); + if (!enable->integer.value) + /* sensor is disabled */ + return 0; + + flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS); + name = atk_get_pack_member(data, obj, HWMON_PACK_NAME); + limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1); + limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2); + + sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); + if (!sensor) + return -ENOMEM; + + sensor->acpi_name = devm_kstrdup(dev, name->string.pointer, GFP_KERNEL); + if (!sensor->acpi_name) + return -ENOMEM; + + INIT_LIST_HEAD(&sensor->list); + sensor->type = type; + sensor->data = data; + sensor->id = flags->integer.value; + sensor->limit1 = limit1->integer.value; + if (data->old_interface) + sensor->limit2 = limit2->integer.value; + else + /* The upper limit is expressed as delta from lower limit */ + sensor->limit2 = sensor->limit1 + limit2->integer.value; + + snprintf(sensor->input_attr_name, ATTR_NAME_SIZE, + "%s%d_input", base_name, start + *num); + atk_init_attribute(&sensor->input_attr, + sensor->input_attr_name, + atk_input_show); + + snprintf(sensor->label_attr_name, ATTR_NAME_SIZE, + "%s%d_label", base_name, start + *num); + atk_init_attribute(&sensor->label_attr, + sensor->label_attr_name, + atk_label_show); + + snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE, + "%s%d_%s", base_name, start + *num, limit1_name); + atk_init_attribute(&sensor->limit1_attr, + sensor->limit1_attr_name, + atk_limit1_show); + + snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE, + "%s%d_%s", base_name, start + *num, limit2_name); + atk_init_attribute(&sensor->limit2_attr, + sensor->limit2_attr_name, + atk_limit2_show); + + list_add(&sensor->list, &data->sensor_list); + (*num)++; + + return 1; +} + +static int atk_enumerate_old_hwmon(struct atk_data *data) +{ + struct device *dev = &data->acpi_dev->dev; + struct acpi_buffer buf; + union acpi_object *pack; + acpi_status status; + int i, ret; + int count = 0; + + /* Voltages */ + buf.length = ACPI_ALLOCATE_BUFFER; + status = acpi_evaluate_object_typed(data->atk_handle, + METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE); + if (status != AE_OK) { + dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n", + acpi_format_exception(status)); + + return -ENODEV; + } + + pack = buf.pointer; + for (i = 1; i < pack->package.count; i++) { + union acpi_object *obj = &pack->package.elements[i]; + + ret = atk_add_sensor(data, obj); + if (ret > 0) + count++; + } + ACPI_FREE(buf.pointer); + + /* Temperatures */ + buf.length = ACPI_ALLOCATE_BUFFER; + status = acpi_evaluate_object_typed(data->atk_handle, + METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE); + if (status != AE_OK) { + dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n", + acpi_format_exception(status)); + + return -ENODEV; + } + + pack = buf.pointer; + for (i = 1; i < pack->package.count; i++) { + union acpi_object *obj = &pack->package.elements[i]; + + ret = atk_add_sensor(data, obj); + if (ret > 0) + count++; + } + ACPI_FREE(buf.pointer); + + /* Fans */ + buf.length = ACPI_ALLOCATE_BUFFER; + status = acpi_evaluate_object_typed(data->atk_handle, + METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE); + if (status != AE_OK) { + dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n", + acpi_format_exception(status)); + + return -ENODEV; + } + + pack = buf.pointer; + for (i = 1; i < pack->package.count; i++) { + union acpi_object *obj = &pack->package.elements[i]; + + ret = atk_add_sensor(data, obj); + if (ret > 0) + count++; + } + ACPI_FREE(buf.pointer); + + return count; +} + +static int atk_ec_present(struct atk_data *data) +{ + struct device *dev = &data->acpi_dev->dev; + union acpi_object *pack; + union acpi_object *ec; + int ret; + int i; + + pack = atk_ggrp(data, ATK_MUX_MGMT); + if (IS_ERR(pack)) { + if (PTR_ERR(pack) == -ENOENT) { + /* The MGMT class does not exists - that's ok */ + dev_dbg(dev, "Class %#llx not found\n", ATK_MUX_MGMT); + return 0; + } + return PTR_ERR(pack); + } + + /* Search the EC */ + ec = NULL; + for (i = 0; i < pack->package.count; i++) { + union acpi_object *obj = &pack->package.elements[i]; + union acpi_object *id; + + if (obj->type != ACPI_TYPE_PACKAGE) + continue; + + id = &obj->package.elements[0]; + if (id->type != ACPI_TYPE_INTEGER) + continue; + + if (id->integer.value == ATK_EC_ID) { + ec = obj; + break; + } + } + + ret = (ec != NULL); + if (!ret) + /* The system has no EC */ + dev_dbg(dev, "EC not found\n"); + + ACPI_FREE(pack); + return ret; +} + +static int atk_ec_enabled(struct atk_data *data) +{ + struct device *dev = &data->acpi_dev->dev; + union acpi_object *obj; + struct atk_acpi_ret_buffer *buf; + int err; + + obj = atk_gitm(data, ATK_EC_ID); + if (IS_ERR(obj)) { + dev_err(dev, "Unable to query EC status\n"); + return PTR_ERR(obj); + } + buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer; + + if (buf->flags == 0) { + dev_err(dev, "Unable to query EC status\n"); + err = -EIO; + } else { + err = (buf->value != 0); + dev_dbg(dev, "EC is %sabled\n", + err ? "en" : "dis"); + } + + ACPI_FREE(obj); + return err; +} + +static int atk_ec_ctl(struct atk_data *data, int enable) +{ + struct device *dev = &data->acpi_dev->dev; + union acpi_object *obj; + struct atk_acpi_input_buf sitm; + struct atk_acpi_ret_buffer *ec_ret; + int err = 0; + + sitm.id = ATK_EC_ID; + sitm.param1 = enable; + sitm.param2 = 0; + + obj = atk_sitm(data, &sitm); + if (IS_ERR(obj)) { + dev_err(dev, "Failed to %sable the EC\n", + enable ? "en" : "dis"); + return PTR_ERR(obj); + } + ec_ret = (struct atk_acpi_ret_buffer *)obj->buffer.pointer; + if (ec_ret->flags == 0) { + dev_err(dev, "Failed to %sable the EC\n", + enable ? "en" : "dis"); + err = -EIO; + } else { + dev_info(dev, "EC %sabled\n", + enable ? "en" : "dis"); + } + + ACPI_FREE(obj); + return err; +} + +static int atk_enumerate_new_hwmon(struct atk_data *data) +{ + struct device *dev = &data->acpi_dev->dev; + union acpi_object *pack; + int err; + int i; + + err = atk_ec_present(data); + if (err < 0) + return err; + if (err) { + err = atk_ec_enabled(data); + if (err < 0) + return err; + /* If the EC was disabled we will disable it again on unload */ + data->disable_ec = err; + + err = atk_ec_ctl(data, 1); + if (err) { + data->disable_ec = false; + return err; + } + } + + dev_dbg(dev, "Enumerating hwmon sensors\n"); + + pack = atk_ggrp(data, ATK_MUX_HWMON); + if (IS_ERR(pack)) + return PTR_ERR(pack); + + for (i = 0; i < pack->package.count; i++) { + union acpi_object *obj = &pack->package.elements[i]; + + atk_add_sensor(data, obj); + } + + err = data->voltage_count + data->temperature_count + data->fan_count; + + ACPI_FREE(pack); + return err; +} + +static int atk_init_attribute_groups(struct atk_data *data) +{ + struct device *dev = &data->acpi_dev->dev; + struct atk_sensor_data *s; + struct attribute **attrs; + int i = 0; + int len = (data->voltage_count + data->temperature_count + + data->fan_count) * 4 + 1; + + attrs = devm_kcalloc(dev, len, sizeof(struct attribute *), GFP_KERNEL); + if (!attrs) + return -ENOMEM; + + list_for_each_entry(s, &data->sensor_list, list) { + attrs[i++] = &s->input_attr.attr; + attrs[i++] = &s->label_attr.attr; + attrs[i++] = &s->limit1_attr.attr; + attrs[i++] = &s->limit2_attr.attr; + } + + data->attr_group.attrs = attrs; + data->attr_groups[0] = &data->attr_group; + + return 0; +} + +static int atk_register_hwmon(struct atk_data *data) +{ + struct device *dev = &data->acpi_dev->dev; + + dev_dbg(dev, "registering hwmon device\n"); + data->hwmon_dev = hwmon_device_register_with_groups(dev, "atk0110", + data, + data->attr_groups); + + return PTR_ERR_OR_ZERO(data->hwmon_dev); +} + +static int atk_probe_if(struct atk_data *data) +{ + struct device *dev = &data->acpi_dev->dev; + acpi_handle ret; + acpi_status status; + int err = 0; + + /* RTMP: read temperature */ + status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret); + if (ACPI_SUCCESS(status)) + data->rtmp_handle = ret; + else + dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n", + acpi_format_exception(status)); + + /* RVLT: read voltage */ + status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret); + if (ACPI_SUCCESS(status)) + data->rvlt_handle = ret; + else + dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n", + acpi_format_exception(status)); + + /* RFAN: read fan status */ + status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret); + if (ACPI_SUCCESS(status)) + data->rfan_handle = ret; + else + dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n", + acpi_format_exception(status)); + + /* Enumeration */ + status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret); + if (ACPI_SUCCESS(status)) + data->enumerate_handle = ret; + else + dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n", + acpi_format_exception(status)); + + /* De-multiplexer (read) */ + status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret); + if (ACPI_SUCCESS(status)) + data->read_handle = ret; + else + dev_dbg(dev, "method " METHOD_READ " not found: %s\n", + acpi_format_exception(status)); + + /* De-multiplexer (write) */ + status = acpi_get_handle(data->atk_handle, METHOD_WRITE, &ret); + if (ACPI_SUCCESS(status)) + data->write_handle = ret; + else + dev_dbg(dev, "method " METHOD_WRITE " not found: %s\n", + acpi_format_exception(status)); + + /* + * Check for hwmon methods: first check "old" style methods; note that + * both may be present: in this case we stick to the old interface; + * analysis of multiple DSDTs indicates that when both interfaces + * are present the new one (GGRP/GITM) is not functional. + */ + if (new_if) + dev_info(dev, "Overriding interface detection\n"); + if (data->rtmp_handle && + data->rvlt_handle && data->rfan_handle && !new_if) + data->old_interface = true; + else if (data->enumerate_handle && data->read_handle && + data->write_handle) + data->old_interface = false; + else + err = -ENODEV; + + return err; +} + +static int atk_add(struct acpi_device *device) +{ + acpi_status ret; + int err; + struct acpi_buffer buf; + union acpi_object *obj; + struct atk_data *data; + + dev_dbg(&device->dev, "adding...\n"); + + data = devm_kzalloc(&device->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->acpi_dev = device; + data->atk_handle = device->handle; + INIT_LIST_HEAD(&data->sensor_list); + data->disable_ec = false; + + buf.length = ACPI_ALLOCATE_BUFFER; + ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL, + &buf, ACPI_TYPE_PACKAGE); + if (ret != AE_OK) { + dev_dbg(&device->dev, "atk: method MBIF not found\n"); + } else { + obj = buf.pointer; + if (obj->package.count >= 2) { + union acpi_object *id = &obj->package.elements[1]; + if (id->type == ACPI_TYPE_STRING) + dev_dbg(&device->dev, "board ID = %s\n", + id->string.pointer); + } + ACPI_FREE(buf.pointer); + } + + err = atk_probe_if(data); + if (err) { + dev_err(&device->dev, "No usable hwmon interface detected\n"); + goto out; + } + + if (data->old_interface) { + dev_dbg(&device->dev, "Using old hwmon interface\n"); + err = atk_enumerate_old_hwmon(data); + } else { + dev_dbg(&device->dev, "Using new hwmon interface\n"); + err = atk_enumerate_new_hwmon(data); + } + if (err < 0) + goto out; + if (err == 0) { + dev_info(&device->dev, + "No usable sensor detected, bailing out\n"); + err = -ENODEV; + goto out; + } + + err = atk_init_attribute_groups(data); + if (err) + goto out; + err = atk_register_hwmon(data); + if (err) + goto out; + + atk_debugfs_init(data); + + device->driver_data = data; + return 0; +out: + if (data->disable_ec) + atk_ec_ctl(data, 0); + return err; +} + +static int atk_remove(struct acpi_device *device) +{ + struct atk_data *data = device->driver_data; + dev_dbg(&device->dev, "removing...\n"); + + device->driver_data = NULL; + + atk_debugfs_cleanup(data); + + hwmon_device_unregister(data->hwmon_dev); + + if (data->disable_ec) { + if (atk_ec_ctl(data, 0)) + dev_err(&device->dev, "Failed to disable EC\n"); + } + + return 0; +} + +static int __init atk0110_init(void) +{ + int ret; + + /* Make sure it's safe to access the device through ACPI */ + if (!acpi_resources_are_enforced()) { + pr_err("Resources not safely usable due to acpi_enforce_resources kernel parameter\n"); + return -EBUSY; + } + + if (dmi_check_system(atk_force_new_if)) + new_if = true; + + ret = acpi_bus_register_driver(&atk_driver); + if (ret) + pr_info("acpi_bus_register_driver failed: %d\n", ret); + + return ret; +} + +static void __exit atk0110_exit(void) +{ + acpi_bus_unregister_driver(&atk_driver); +} + +module_init(atk0110_init); +module_exit(atk0110_exit); + +MODULE_LICENSE("GPL"); |