drivers/base/physical_location.c

   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
  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                 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
  42 static 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 }
  71 static DEVICE_ATTR_RO(panel);
  72
  73 static 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 }
  93 static DEVICE_ATTR_RO(vertical_position);
  94
  95 static 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 }
 115 static DEVICE_ATTR_RO(horizontal_position);
 116
 117 static 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 }
 123 static DEVICE_ATTR_RO(dock);
 124
 125 static 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 }
 131 static DEVICE_ATTR_RO(lid);
 132
 133 static 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
 142 const struct attribute_group dev_attr_physical_location_group = {
 143         .name = "physical_location",
 144         .attrs = dev_attr_physical_location,
 145 };
 146