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