diff options
| author | Won Chung <wonchung@google.com> | 2022-03-14 19:54:58 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-27 09:51:57 +0200 |
| commit | 6423d2951087231706246f81851067f7f0593d4a (patch) | |
| tree | 7bef65f539da19fd619fa25ebf70015dd337ea59 /drivers/base/core.c | |
| parent | ce753ad1549cbe9ccaea4c06a1f5fa47432c8289 (diff) | |
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>
Diffstat (limited to 'drivers/base/core.c')
| -rw-r--r-- | drivers/base/core.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 3d6430eb0c6a..50f9aa3fb92b 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -32,6 +32,7 @@ #include <linux/dma-map-ops.h> /* for dma_default_coherent */ #include "base.h" +#include "physical_location.h" #include "power/power.h" #ifdef CONFIG_SYSFS_DEPRECATED @@ -2649,8 +2650,17 @@ static int device_add_attrs(struct device *dev) goto err_remove_dev_waiting_for_supplier; } + if (dev_add_physical_location(dev)) { + error = device_add_group(dev, + &dev_attr_physical_location_group); + if (error) + goto err_remove_dev_removable; + } + return 0; + err_remove_dev_removable: + device_remove_file(dev, &dev_attr_removable); err_remove_dev_waiting_for_supplier: device_remove_file(dev, &dev_attr_waiting_for_supplier); err_remove_dev_online: @@ -2672,6 +2682,11 @@ static void device_remove_attrs(struct device *dev) struct class *class = dev->class; const struct device_type *type = dev->type; + if (dev->physical_location) { + device_remove_group(dev, &dev_attr_physical_location_group); + kfree(dev->physical_location); + } + device_remove_file(dev, &dev_attr_removable); device_remove_file(dev, &dev_attr_waiting_for_supplier); device_remove_file(dev, &dev_attr_online); |