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		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
 39static 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	case DEVICE_PANEL_BACK:
 61		panel = "back";
 62		break;
 63	default:
 64		panel = "unknown";
 65	}
 66	return sysfs_emit(buf, "%s\n", panel);
 67}
 68static DEVICE_ATTR_RO(panel);
 69
 70static ssize_t vertical_position_show(struct device *dev,
 71	struct device_attribute *attr, char *buf)
 72{
 73	const char *vertical_position;
 74
 75	switch (dev->physical_location->vertical_position) {
 76	case DEVICE_VERT_POS_UPPER:
 77		vertical_position = "upper";
 78		break;
 79	case DEVICE_VERT_POS_CENTER:
 80		vertical_position = "center";
 81		break;
 82	case DEVICE_VERT_POS_LOWER:
 83		vertical_position = "lower";
 84		break;
 85	default:
 86		vertical_position = "unknown";
 87	}
 88	return sysfs_emit(buf, "%s\n", vertical_position);
 89}
 90static DEVICE_ATTR_RO(vertical_position);
 91
 92static ssize_t horizontal_position_show(struct device *dev,
 93	struct device_attribute *attr, char *buf)
 94{
 95	const char *horizontal_position;
 96
 97	switch (dev->physical_location->horizontal_position) {
 98	case DEVICE_HORI_POS_LEFT:
 99		horizontal_position = "left";
100		break;
101	case DEVICE_HORI_POS_CENTER:
102		horizontal_position = "center";
103		break;
104	case DEVICE_HORI_POS_RIGHT:
105		horizontal_position = "right";
106		break;
107	default:
108		horizontal_position = "unknown";
109	}
110	return sysfs_emit(buf, "%s\n", horizontal_position);
111}
112static DEVICE_ATTR_RO(horizontal_position);
113
114static ssize_t dock_show(struct device *dev, struct device_attribute *attr,
115	char *buf)
116{
117	return sysfs_emit(buf, "%s\n",
118		dev->physical_location->dock ? "yes" : "no");
119}
120static DEVICE_ATTR_RO(dock);
121
122static ssize_t lid_show(struct device *dev, struct device_attribute *attr,
123	char *buf)
124{
125	return sysfs_emit(buf, "%s\n",
126		dev->physical_location->lid ? "yes" : "no");
127}
128static DEVICE_ATTR_RO(lid);
129
130static struct attribute *dev_attr_physical_location[] = {
131	&dev_attr_panel.attr,
132	&dev_attr_vertical_position.attr,
133	&dev_attr_horizontal_position.attr,
134	&dev_attr_dock.attr,
135	&dev_attr_lid.attr,
136	NULL,
137};
138
139const struct attribute_group dev_attr_physical_location_group = {
140	.name = "physical_location",
141	.attrs = dev_attr_physical_location,
142};
143