1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Device physical location support
  4 *
  5 * Author: Won Chung <wonchung@google.com>
  6 */
  7
  8#include <linux/acpi.h>
  9#include <linux/sysfs.h>
 10
 11#include "physical_location.h"
 12
 13bool dev_add_physical_location(struct device *dev)
 14{
 15	struct acpi_pld_info *pld;
 16	acpi_status status;
 17
 18	if (!has_acpi_companion(dev))
 19		return false;
 20
 21	status = acpi_get_physical_device_location(ACPI_HANDLE(dev), &pld);
 22	if (ACPI_FAILURE(status))
 23		return false;
 24
 25	dev->physical_location =
 26		kzalloc(sizeof(*dev->physical_location), GFP_KERNEL);
 27	if (!dev->physical_location) {
 28		ACPI_FREE(pld);
 29		return false;
 30	}
 31
 32	dev->physical_location->panel = pld->panel;
 33	dev->physical_location->vertical_position = pld->vertical_position;
 34	dev->physical_location->horizontal_position = pld->horizontal_position;
 35	dev->physical_location->dock = pld->dock;
 36	dev->physical_location->lid = pld->lid;
 37
 38	ACPI_FREE(pld);
 39	return true;
 40}
 41
 42static ssize_t panel_show(struct device *dev, struct device_attribute *attr,
 43	char *buf)
 44{
 45	const char *panel;
 46
 47	switch (dev->physical_location->panel) {
 48	case DEVICE_PANEL_TOP:
 49		panel = "top";
 50		break;
 51	case DEVICE_PANEL_BOTTOM:
 52		panel = "bottom";
 53		break;
 54	case DEVICE_PANEL_LEFT:
 55		panel = "left";
 56		break;
 57	case DEVICE_PANEL_RIGHT:
 58		panel = "right";
 59		break;
 60	case DEVICE_PANEL_FRONT:
 61		panel = "front";
 62		break;
 63	case DEVICE_PANEL_BACK:
 64		panel = "back";
 65		break;
 66	default:
 67		panel = "unknown";
 68	}
 69	return sysfs_emit(buf, "%s\n", panel);
 70}
 71static DEVICE_ATTR_RO(panel);
 72
 73static ssize_t vertical_position_show(struct device *dev,
 74	struct device_attribute *attr, char *buf)
 75{
 76	const char *vertical_position;
 77
 78	switch (dev->physical_location->vertical_position) {
 79	case DEVICE_VERT_POS_UPPER:
 80		vertical_position = "upper";
 81		break;
 82	case DEVICE_VERT_POS_CENTER:
 83		vertical_position = "center";
 84		break;
 85	case DEVICE_VERT_POS_LOWER:
 86		vertical_position = "lower";
 87		break;
 88	default:
 89		vertical_position = "unknown";
 90	}
 91	return sysfs_emit(buf, "%s\n", vertical_position);
 92}
 93static DEVICE_ATTR_RO(vertical_position);
 94
 95static ssize_t horizontal_position_show(struct device *dev,
 96	struct device_attribute *attr, char *buf)
 97{
 98	const char *horizontal_position;
 99
100	switch (dev->physical_location->horizontal_position) {
101	case DEVICE_HORI_POS_LEFT:
102		horizontal_position = "left";
103		break;
104	case DEVICE_HORI_POS_CENTER:
105		horizontal_position = "center";
106		break;
107	case DEVICE_HORI_POS_RIGHT:
108		horizontal_position = "right";
109		break;
110	default:
111		horizontal_position = "unknown";
112	}
113	return sysfs_emit(buf, "%s\n", horizontal_position);
114}
115static DEVICE_ATTR_RO(horizontal_position);
116
117static ssize_t dock_show(struct device *dev, struct device_attribute *attr,
118	char *buf)
119{
120	return sysfs_emit(buf, "%s\n",
121		dev->physical_location->dock ? "yes" : "no");
122}
123static DEVICE_ATTR_RO(dock);
124
125static ssize_t lid_show(struct device *dev, struct device_attribute *attr,
126	char *buf)
127{
128	return sysfs_emit(buf, "%s\n",
129		dev->physical_location->lid ? "yes" : "no");
130}
131static DEVICE_ATTR_RO(lid);
132
133static struct attribute *dev_attr_physical_location[] = {
134	&dev_attr_panel.attr,
135	&dev_attr_vertical_position.attr,
136	&dev_attr_horizontal_position.attr,
137	&dev_attr_dock.attr,
138	&dev_attr_lid.attr,
139	NULL,
140};
141
142const struct attribute_group dev_attr_physical_location_group = {
143	.name = "physical_location",
144	.attrs = dev_attr_physical_location,
145};
146