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