linux-stable/drivers/base/physical_location.h
Won Chung 6423d29510 driver core: Add sysfs support for physical location of a device
When ACPI table includes _PLD fields for a device, create a new
directory (physical_location) in sysfs to share _PLD fields.

Currently without PLD information, when there are multiple of same
devices, it is hard to distinguish which device corresponds to which
physical device at which location. For example, when there are two Type
C connectors, it is hard to find out which connector corresponds to the
Type C port on the left panel versus the Type C port on the right panel.
With PLD information provided, we can determine which specific device at
which location is doing what.

_PLD output includes much more fields, but only generic fields are added
and exposed to sysfs, so that non-ACPI devices can also support it in
the future. The minimal generic fields needed for locating a device are
the following.
- panel
- vertical_position
- horizontal_position
- dock
- lid

Signed-off-by: Won Chung <wonchung@google.com>
Link: https://lore.kernel.org/r/20220314195458.271430-1-wonchung@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-04-27 09:51:57 +02:00

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C

/* SPDX-License-Identifier: GPL-2.0 */
/*
* Device physical location support
*
* Author: Won Chung <wonchung@google.com>
*/
#include <linux/device.h>
#ifdef CONFIG_ACPI
extern bool dev_add_physical_location(struct device *dev);
extern const struct attribute_group dev_attr_physical_location_group;
#else
static inline bool dev_add_physical_location(struct device *dev) { return false; };
static const struct attribute_group dev_attr_physical_location_group = {};
#endif