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 #include <linux/string_choices.h>
11
12 #include "physical_location.h"
13
dev_add_physical_location(struct device * dev)14 bool dev_add_physical_location(struct device *dev)
15 {
16 struct acpi_pld_info *pld;
17
18 if (!has_acpi_companion(dev))
19 return false;
20
21 if (!acpi_get_physical_device_location(ACPI_HANDLE(dev), &pld))
22 return false;
23
24 dev->physical_location =
25 kzalloc(sizeof(*dev->physical_location), GFP_KERNEL);
26 if (!dev->physical_location) {
27 ACPI_FREE(pld);
28 return false;
29 }
30
31 dev->physical_location->panel = pld->panel;
32 dev->physical_location->vertical_position = pld->vertical_position;
33 dev->physical_location->horizontal_position = pld->horizontal_position;
34 dev->physical_location->dock = pld->dock;
35 dev->physical_location->lid = pld->lid;
36
37 ACPI_FREE(pld);
38 return true;
39 }
40
panel_show(struct device * dev,struct device_attribute * attr,char * buf)41 static ssize_t panel_show(struct device *dev, struct device_attribute *attr,
42 char *buf)
43 {
44 const char *panel;
45
46 switch (dev->physical_location->panel) {
47 case DEVICE_PANEL_TOP:
48 panel = "top";
49 break;
50 case DEVICE_PANEL_BOTTOM:
51 panel = "bottom";
52 break;
53 case DEVICE_PANEL_LEFT:
54 panel = "left";
55 break;
56 case DEVICE_PANEL_RIGHT:
57 panel = "right";
58 break;
59 case DEVICE_PANEL_FRONT:
60 panel = "front";
61 break;
62 case DEVICE_PANEL_BACK:
63 panel = "back";
64 break;
65 default:
66 panel = "unknown";
67 }
68 return sysfs_emit(buf, "%s\n", panel);
69 }
70 static DEVICE_ATTR_RO(panel);
71
vertical_position_show(struct device * dev,struct device_attribute * attr,char * buf)72 static ssize_t vertical_position_show(struct device *dev,
73 struct device_attribute *attr, char *buf)
74 {
75 const char *vertical_position;
76
77 switch (dev->physical_location->vertical_position) {
78 case DEVICE_VERT_POS_UPPER:
79 vertical_position = "upper";
80 break;
81 case DEVICE_VERT_POS_CENTER:
82 vertical_position = "center";
83 break;
84 case DEVICE_VERT_POS_LOWER:
85 vertical_position = "lower";
86 break;
87 default:
88 vertical_position = "unknown";
89 }
90 return sysfs_emit(buf, "%s\n", vertical_position);
91 }
92 static DEVICE_ATTR_RO(vertical_position);
93
horizontal_position_show(struct device * dev,struct device_attribute * attr,char * buf)94 static ssize_t horizontal_position_show(struct device *dev,
95 struct device_attribute *attr, char *buf)
96 {
97 const char *horizontal_position;
98
99 switch (dev->physical_location->horizontal_position) {
100 case DEVICE_HORI_POS_LEFT:
101 horizontal_position = "left";
102 break;
103 case DEVICE_HORI_POS_CENTER:
104 horizontal_position = "center";
105 break;
106 case DEVICE_HORI_POS_RIGHT:
107 horizontal_position = "right";
108 break;
109 default:
110 horizontal_position = "unknown";
111 }
112 return sysfs_emit(buf, "%s\n", horizontal_position);
113 }
114 static DEVICE_ATTR_RO(horizontal_position);
115
dock_show(struct device * dev,struct device_attribute * attr,char * buf)116 static ssize_t dock_show(struct device *dev, struct device_attribute *attr,
117 char *buf)
118 {
119 return sysfs_emit(buf, "%s\n",
120 str_yes_no(dev->physical_location->dock));
121 }
122 static DEVICE_ATTR_RO(dock);
123
lid_show(struct device * dev,struct device_attribute * attr,char * buf)124 static ssize_t lid_show(struct device *dev, struct device_attribute *attr,
125 char *buf)
126 {
127 return sysfs_emit(buf, "%s\n",
128 str_yes_no(dev->physical_location->lid));
129 }
130 static DEVICE_ATTR_RO(lid);
131
132 static struct attribute *dev_attr_physical_location[] = {
133 &dev_attr_panel.attr,
134 &dev_attr_vertical_position.attr,
135 &dev_attr_horizontal_position.attr,
136 &dev_attr_dock.attr,
137 &dev_attr_lid.attr,
138 NULL,
139 };
140
141 const struct attribute_group dev_attr_physical_location_group = {
142 .name = "physical_location",
143 .attrs = dev_attr_physical_location,
144 };
145
146