tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
17 if (!has_acpi_companion(dev))
18 return false;
19
20 if (!acpi_get_physical_device_location(ACPI_HANDLE(dev), &pld))
21 return false;
22
23 dev->physical_location =
24 kzalloc(sizeof(*dev->physical_location), GFP_KERNEL);
25 if (!dev->physical_location) {
26 ACPI_FREE(pld);
27 return false;
28 }
29
30 dev->physical_location->panel = pld->panel;
31 dev->physical_location->vertical_position = pld->vertical_position;
32 dev->physical_location->horizontal_position = pld->horizontal_position;
33 dev->physical_location->dock = pld->dock;
34 dev->physical_location->lid = pld->lid;
35
36 ACPI_FREE(pld);
37 return true;
38}
39
40static ssize_t panel_show(struct device *dev, struct device_attribute *attr,
41 char *buf)
42{
43 const char *panel;
44
45 switch (dev->physical_location->panel) {
46 case DEVICE_PANEL_TOP:
47 panel = "top";
48 break;
49 case DEVICE_PANEL_BOTTOM:
50 panel = "bottom";
51 break;
52 case DEVICE_PANEL_LEFT:
53 panel = "left";
54 break;
55 case DEVICE_PANEL_RIGHT:
56 panel = "right";
57 break;
58 case DEVICE_PANEL_FRONT:
59 panel = "front";
60 break;
61 case DEVICE_PANEL_BACK:
62 panel = "back";
63 break;
64 default:
65 panel = "unknown";
66 }
67 return sysfs_emit(buf, "%s\n", panel);
68}
69static DEVICE_ATTR_RO(panel);
70
71static ssize_t vertical_position_show(struct device *dev,
72 struct device_attribute *attr, char *buf)
73{
74 const char *vertical_position;
75
76 switch (dev->physical_location->vertical_position) {
77 case DEVICE_VERT_POS_UPPER:
78 vertical_position = "upper";
79 break;
80 case DEVICE_VERT_POS_CENTER:
81 vertical_position = "center";
82 break;
83 case DEVICE_VERT_POS_LOWER:
84 vertical_position = "lower";
85 break;
86 default:
87 vertical_position = "unknown";
88 }
89 return sysfs_emit(buf, "%s\n", vertical_position);
90}
91static DEVICE_ATTR_RO(vertical_position);
92
93static ssize_t horizontal_position_show(struct device *dev,
94 struct device_attribute *attr, char *buf)
95{
96 const char *horizontal_position;
97
98 switch (dev->physical_location->horizontal_position) {
99 case DEVICE_HORI_POS_LEFT:
100 horizontal_position = "left";
101 break;
102 case DEVICE_HORI_POS_CENTER:
103 horizontal_position = "center";
104 break;
105 case DEVICE_HORI_POS_RIGHT:
106 horizontal_position = "right";
107 break;
108 default:
109 horizontal_position = "unknown";
110 }
111 return sysfs_emit(buf, "%s\n", horizontal_position);
112}
113static DEVICE_ATTR_RO(horizontal_position);
114
115static ssize_t dock_show(struct device *dev, struct device_attribute *attr,
116 char *buf)
117{
118 return sysfs_emit(buf, "%s\n",
119 dev->physical_location->dock ? "yes" : "no");
120}
121static DEVICE_ATTR_RO(dock);
122
123static ssize_t lid_show(struct device *dev, struct device_attribute *attr,
124 char *buf)
125{
126 return sysfs_emit(buf, "%s\n",
127 dev->physical_location->lid ? "yes" : "no");
128}
129static DEVICE_ATTR_RO(lid);
130
131static struct attribute *dev_attr_physical_location[] = {
132 &dev_attr_panel.attr,
133 &dev_attr_vertical_position.attr,
134 &dev_attr_horizontal_position.attr,
135 &dev_attr_dock.attr,
136 &dev_attr_lid.attr,
137 NULL,
138};
139
140const struct attribute_group dev_attr_physical_location_group = {
141 .name = "physical_location",
142 .attrs = dev_attr_physical_location,
143};
144