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#include <linux/string_choices.h>
 11
 12#include "physical_location.h"
 13
 14bool 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
 41static 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}
 70static DEVICE_ATTR_RO(panel);
 71
 72static 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}
 92static DEVICE_ATTR_RO(vertical_position);
 93
 94static 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}
114static DEVICE_ATTR_RO(horizontal_position);
115
116static 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}
122static DEVICE_ATTR_RO(dock);
123
124static 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}
130static DEVICE_ATTR_RO(lid);
131
132static 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
141const struct attribute_group dev_attr_physical_location_group = {
142	.name = "physical_location",
143	.attrs = dev_attr_physical_location,
144};
145