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
147