144 строки
3.3 KiB
C
144 строки
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Device physical location support
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*
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* Author: Won Chung <wonchung@google.com>
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*/
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#include <linux/acpi.h>
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#include <linux/sysfs.h>
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#include "physical_location.h"
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bool dev_add_physical_location(struct device *dev)
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{
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struct acpi_pld_info *pld;
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acpi_status status;
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if (!has_acpi_companion(dev))
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return false;
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status = acpi_get_physical_device_location(ACPI_HANDLE(dev), &pld);
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if (ACPI_FAILURE(status))
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return false;
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dev->physical_location =
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kzalloc(sizeof(*dev->physical_location), GFP_KERNEL);
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if (!dev->physical_location)
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return false;
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dev->physical_location->panel = pld->panel;
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dev->physical_location->vertical_position = pld->vertical_position;
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dev->physical_location->horizontal_position = pld->horizontal_position;
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dev->physical_location->dock = pld->dock;
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dev->physical_location->lid = pld->lid;
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ACPI_FREE(pld);
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return true;
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}
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static ssize_t panel_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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const char *panel;
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switch (dev->physical_location->panel) {
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case DEVICE_PANEL_TOP:
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panel = "top";
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break;
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case DEVICE_PANEL_BOTTOM:
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panel = "bottom";
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break;
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case DEVICE_PANEL_LEFT:
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panel = "left";
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break;
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case DEVICE_PANEL_RIGHT:
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panel = "right";
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break;
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case DEVICE_PANEL_FRONT:
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panel = "front";
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break;
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case DEVICE_PANEL_BACK:
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panel = "back";
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break;
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default:
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panel = "unknown";
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}
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return sysfs_emit(buf, "%s\n", panel);
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}
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static DEVICE_ATTR_RO(panel);
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static ssize_t vertical_position_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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const char *vertical_position;
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switch (dev->physical_location->vertical_position) {
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case DEVICE_VERT_POS_UPPER:
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vertical_position = "upper";
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break;
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case DEVICE_VERT_POS_CENTER:
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vertical_position = "center";
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break;
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case DEVICE_VERT_POS_LOWER:
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vertical_position = "lower";
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break;
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default:
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vertical_position = "unknown";
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}
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return sysfs_emit(buf, "%s\n", vertical_position);
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}
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static DEVICE_ATTR_RO(vertical_position);
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static ssize_t horizontal_position_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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const char *horizontal_position;
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switch (dev->physical_location->horizontal_position) {
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case DEVICE_HORI_POS_LEFT:
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horizontal_position = "left";
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break;
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case DEVICE_HORI_POS_CENTER:
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horizontal_position = "center";
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break;
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case DEVICE_HORI_POS_RIGHT:
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horizontal_position = "right";
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break;
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default:
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horizontal_position = "unknown";
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}
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return sysfs_emit(buf, "%s\n", horizontal_position);
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}
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static DEVICE_ATTR_RO(horizontal_position);
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static ssize_t dock_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sysfs_emit(buf, "%s\n",
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dev->physical_location->dock ? "yes" : "no");
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}
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static DEVICE_ATTR_RO(dock);
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static ssize_t lid_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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return sysfs_emit(buf, "%s\n",
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dev->physical_location->lid ? "yes" : "no");
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}
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static DEVICE_ATTR_RO(lid);
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static struct attribute *dev_attr_physical_location[] = {
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&dev_attr_panel.attr,
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&dev_attr_vertical_position.attr,
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&dev_attr_horizontal_position.attr,
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&dev_attr_dock.attr,
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&dev_attr_lid.attr,
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NULL,
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};
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const struct attribute_group dev_attr_physical_location_group = {
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.name = "physical_location",
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.attrs = dev_attr_physical_location,
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};
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