diff options
Diffstat (limited to 'drivers/platform/x86/dell/dell-wmi-ddv.c')
| -rw-r--r-- | drivers/platform/x86/dell/dell-wmi-ddv.c | 375 |
1 files changed, 375 insertions, 0 deletions
diff --git a/drivers/platform/x86/dell/dell-wmi-ddv.c b/drivers/platform/x86/dell/dell-wmi-ddv.c new file mode 100644 index 000000000000..2bb449845d14 --- /dev/null +++ b/drivers/platform/x86/dell/dell-wmi-ddv.c @@ -0,0 +1,375 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Linux driver for WMI sensor information on Dell notebooks. + * + * Copyright (C) 2022 Armin Wolf <W_Armin@gmx.de> + */ + +#define pr_format(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/acpi.h> +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/dev_printk.h> +#include <linux/kernel.h> +#include <linux/kstrtox.h> +#include <linux/math.h> +#include <linux/module.h> +#include <linux/limits.h> +#include <linux/power_supply.h> +#include <linux/printk.h> +#include <linux/seq_file.h> +#include <linux/sysfs.h> +#include <linux/wmi.h> + +#include <acpi/battery.h> + +#define DRIVER_NAME "dell-wmi-ddv" + +#define DELL_DDV_SUPPORTED_INTERFACE 2 +#define DELL_DDV_GUID "8A42EA14-4F2A-FD45-6422-0087F7A7E608" + +#define DELL_EPPID_LENGTH 20 +#define DELL_EPPID_EXT_LENGTH 23 + +enum dell_ddv_method { + DELL_DDV_BATTERY_DESIGN_CAPACITY = 0x01, + DELL_DDV_BATTERY_FULL_CHARGE_CAPACITY = 0x02, + DELL_DDV_BATTERY_MANUFACTURE_NAME = 0x03, + DELL_DDV_BATTERY_MANUFACTURE_DATE = 0x04, + DELL_DDV_BATTERY_SERIAL_NUMBER = 0x05, + DELL_DDV_BATTERY_CHEMISTRY_VALUE = 0x06, + DELL_DDV_BATTERY_TEMPERATURE = 0x07, + DELL_DDV_BATTERY_CURRENT = 0x08, + DELL_DDV_BATTERY_VOLTAGE = 0x09, + DELL_DDV_BATTERY_MANUFACTURER_ACCESS = 0x0A, + DELL_DDV_BATTERY_RELATIVE_CHARGE_STATE = 0x0B, + DELL_DDV_BATTERY_CYCLE_COUNT = 0x0C, + DELL_DDV_BATTERY_EPPID = 0x0D, + DELL_DDV_BATTERY_RAW_ANALYTICS_START = 0x0E, + DELL_DDV_BATTERY_RAW_ANALYTICS = 0x0F, + DELL_DDV_BATTERY_DESIGN_VOLTAGE = 0x10, + + DELL_DDV_INTERFACE_VERSION = 0x12, + + DELL_DDV_FAN_SENSOR_INFORMATION = 0x20, + DELL_DDV_THERMAL_SENSOR_INFORMATION = 0x22, +}; + +struct dell_wmi_ddv_data { + struct acpi_battery_hook hook; + struct device_attribute temp_attr; + struct device_attribute eppid_attr; + struct wmi_device *wdev; +}; + +static int dell_wmi_ddv_query_type(struct wmi_device *wdev, enum dell_ddv_method method, u32 arg, + union acpi_object **result, acpi_object_type type) +{ + struct acpi_buffer out = { ACPI_ALLOCATE_BUFFER, NULL }; + const struct acpi_buffer in = { + .length = sizeof(arg), + .pointer = &arg, + }; + union acpi_object *obj; + acpi_status ret; + + ret = wmidev_evaluate_method(wdev, 0x0, method, &in, &out); + if (ACPI_FAILURE(ret)) + return -EIO; + + obj = out.pointer; + if (!obj) + return -ENODATA; + + if (obj->type != type) { + kfree(obj); + return -EIO; + } + + *result = obj; + + return 0; +} + +static int dell_wmi_ddv_query_integer(struct wmi_device *wdev, enum dell_ddv_method method, + u32 arg, u32 *res) +{ + union acpi_object *obj; + int ret; + + ret = dell_wmi_ddv_query_type(wdev, method, arg, &obj, ACPI_TYPE_INTEGER); + if (ret < 0) + return ret; + + if (obj->integer.value <= U32_MAX) + *res = (u32)obj->integer.value; + else + ret = -ERANGE; + + kfree(obj); + + return ret; +} + +static int dell_wmi_ddv_query_buffer(struct wmi_device *wdev, enum dell_ddv_method method, + u32 arg, union acpi_object **result) +{ + union acpi_object *obj; + u64 buffer_size; + int ret; + + ret = dell_wmi_ddv_query_type(wdev, method, arg, &obj, ACPI_TYPE_PACKAGE); + if (ret < 0) + return ret; + + if (obj->package.count != 2) + goto err_free; + + if (obj->package.elements[0].type != ACPI_TYPE_INTEGER) + goto err_free; + + buffer_size = obj->package.elements[0].integer.value; + + if (obj->package.elements[1].type != ACPI_TYPE_BUFFER) + goto err_free; + + if (buffer_size > obj->package.elements[1].buffer.length) { + dev_warn(&wdev->dev, + FW_WARN "WMI buffer size (%llu) exceeds ACPI buffer size (%d)\n", + buffer_size, obj->package.elements[1].buffer.length); + + goto err_free; + } + + *result = obj; + + return 0; + +err_free: + kfree(obj); + + return -EIO; +} + +static int dell_wmi_ddv_query_string(struct wmi_device *wdev, enum dell_ddv_method method, + u32 arg, union acpi_object **result) +{ + return dell_wmi_ddv_query_type(wdev, method, arg, result, ACPI_TYPE_STRING); +} + +static int dell_wmi_ddv_battery_index(struct acpi_device *acpi_dev, u32 *index) +{ + const char *uid_str; + + uid_str = acpi_device_uid(acpi_dev); + if (!uid_str) + return -ENODEV; + + return kstrtou32(uid_str, 10, index); +} + +static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dell_wmi_ddv_data *data = container_of(attr, struct dell_wmi_ddv_data, temp_attr); + u32 index, value; + int ret; + + ret = dell_wmi_ddv_battery_index(to_acpi_device(dev->parent), &index); + if (ret < 0) + return ret; + + ret = dell_wmi_ddv_query_integer(data->wdev, DELL_DDV_BATTERY_TEMPERATURE, index, &value); + if (ret < 0) + return ret; + + return sysfs_emit(buf, "%d\n", DIV_ROUND_CLOSEST(value, 10)); +} + +static ssize_t eppid_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct dell_wmi_ddv_data *data = container_of(attr, struct dell_wmi_ddv_data, eppid_attr); + union acpi_object *obj; + u32 index; + int ret; + + ret = dell_wmi_ddv_battery_index(to_acpi_device(dev->parent), &index); + if (ret < 0) + return ret; + + ret = dell_wmi_ddv_query_string(data->wdev, DELL_DDV_BATTERY_EPPID, index, &obj); + if (ret < 0) + return ret; + + if (obj->string.length != DELL_EPPID_LENGTH && obj->string.length != DELL_EPPID_EXT_LENGTH) + dev_info_once(&data->wdev->dev, FW_INFO "Suspicious ePPID length (%d)\n", + obj->string.length); + + ret = sysfs_emit(buf, "%s\n", obj->string.pointer); + + kfree(obj); + + return ret; +} + +static int dell_wmi_ddv_add_battery(struct power_supply *battery, struct acpi_battery_hook *hook) +{ + struct dell_wmi_ddv_data *data = container_of(hook, struct dell_wmi_ddv_data, hook); + u32 index; + int ret; + + /* Return 0 instead of error to avoid being unloaded */ + ret = dell_wmi_ddv_battery_index(to_acpi_device(battery->dev.parent), &index); + if (ret < 0) + return 0; + + ret = device_create_file(&battery->dev, &data->temp_attr); + if (ret < 0) + return ret; + + ret = device_create_file(&battery->dev, &data->eppid_attr); + if (ret < 0) { + device_remove_file(&battery->dev, &data->temp_attr); + + return ret; + } + + return 0; +} + +static int dell_wmi_ddv_remove_battery(struct power_supply *battery, struct acpi_battery_hook *hook) +{ + struct dell_wmi_ddv_data *data = container_of(hook, struct dell_wmi_ddv_data, hook); + + device_remove_file(&battery->dev, &data->temp_attr); + device_remove_file(&battery->dev, &data->eppid_attr); + + return 0; +} + +static void dell_wmi_ddv_battery_remove(void *data) +{ + struct acpi_battery_hook *hook = data; + + battery_hook_unregister(hook); +} + +static int dell_wmi_ddv_battery_add(struct dell_wmi_ddv_data *data) +{ + data->hook.name = "Dell DDV Battery Extension"; + data->hook.add_battery = dell_wmi_ddv_add_battery; + data->hook.remove_battery = dell_wmi_ddv_remove_battery; + + sysfs_attr_init(&data->temp_attr.attr); + data->temp_attr.attr.name = "temp"; + data->temp_attr.attr.mode = 0444; + data->temp_attr.show = temp_show; + + sysfs_attr_init(&data->eppid_attr.attr); + data->eppid_attr.attr.name = "eppid"; + data->eppid_attr.attr.mode = 0444; + data->eppid_attr.show = eppid_show; + + battery_hook_register(&data->hook); + + return devm_add_action_or_reset(&data->wdev->dev, dell_wmi_ddv_battery_remove, &data->hook); +} + +static int dell_wmi_ddv_buffer_read(struct seq_file *seq, enum dell_ddv_method method) +{ + struct device *dev = seq->private; + struct dell_wmi_ddv_data *data = dev_get_drvdata(dev); + union acpi_object *obj; + u64 size; + u8 *buf; + int ret; + + ret = dell_wmi_ddv_query_buffer(data->wdev, method, 0, &obj); + if (ret < 0) + return ret; + + size = obj->package.elements[0].integer.value; + buf = obj->package.elements[1].buffer.pointer; + ret = seq_write(seq, buf, size); + kfree(obj); + + return ret; +} + +static int dell_wmi_ddv_fan_read(struct seq_file *seq, void *offset) +{ + return dell_wmi_ddv_buffer_read(seq, DELL_DDV_FAN_SENSOR_INFORMATION); +} + +static int dell_wmi_ddv_temp_read(struct seq_file *seq, void *offset) +{ + return dell_wmi_ddv_buffer_read(seq, DELL_DDV_THERMAL_SENSOR_INFORMATION); +} + +static void dell_wmi_ddv_debugfs_remove(void *data) +{ + struct dentry *entry = data; + + debugfs_remove(entry); +} + +static void dell_wmi_ddv_debugfs_init(struct wmi_device *wdev) +{ + struct dentry *entry; + char name[64]; + + scnprintf(name, ARRAY_SIZE(name), "%s-%s", DRIVER_NAME, dev_name(&wdev->dev)); + entry = debugfs_create_dir(name, NULL); + + debugfs_create_devm_seqfile(&wdev->dev, "fan_sensor_information", entry, + dell_wmi_ddv_fan_read); + debugfs_create_devm_seqfile(&wdev->dev, "thermal_sensor_information", entry, + dell_wmi_ddv_temp_read); + + devm_add_action_or_reset(&wdev->dev, dell_wmi_ddv_debugfs_remove, entry); +} + +static int dell_wmi_ddv_probe(struct wmi_device *wdev, const void *context) +{ + struct dell_wmi_ddv_data *data; + u32 version; + int ret; + + ret = dell_wmi_ddv_query_integer(wdev, DELL_DDV_INTERFACE_VERSION, 0, &version); + if (ret < 0) + return ret; + + dev_dbg(&wdev->dev, "WMI interface version: %d\n", version); + if (version != DELL_DDV_SUPPORTED_INTERFACE) + return -ENODEV; + + data = devm_kzalloc(&wdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + dev_set_drvdata(&wdev->dev, data); + data->wdev = wdev; + + dell_wmi_ddv_debugfs_init(wdev); + + return dell_wmi_ddv_battery_add(data); +} + +static const struct wmi_device_id dell_wmi_ddv_id_table[] = { + { DELL_DDV_GUID, NULL }, + { } +}; +MODULE_DEVICE_TABLE(wmi, dell_wmi_ddv_id_table); + +static struct wmi_driver dell_wmi_ddv_driver = { + .driver = { + .name = DRIVER_NAME, + }, + .id_table = dell_wmi_ddv_id_table, + .probe = dell_wmi_ddv_probe, +}; +module_wmi_driver(dell_wmi_ddv_driver); + +MODULE_AUTHOR("Armin Wolf <W_Armin@gmx.de>"); +MODULE_DESCRIPTION("Dell WMI sensor driver"); +MODULE_LICENSE("GPL"); |