Hi Won,
On Wed, Jan 26, 2022 at 11:58:07PM +0000, Won Chung wrote:
> When ACPI table includes _PLD fields for a device, create a new file
> (pld) in sysfs to share _PLD fields.
If you're adding a new attribute, you should also update the Documentation
file here: Documentation/ABI/testing/sysfs-bus-acpi
Thanks,
Benson
>
> Signed-off-by: Won Chung <wonchung@xxxxxxxxxx>
> ---
> drivers/acpi/device_sysfs.c | 42 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 42 insertions(+)
>
> diff --git a/drivers/acpi/device_sysfs.c b/drivers/acpi/device_sysfs.c
> index d5d6403ba07b..8d4df5fb1c45 100644
> --- a/drivers/acpi/device_sysfs.c
> +++ b/drivers/acpi/device_sysfs.c
> @@ -509,6 +509,40 @@ static ssize_t status_show(struct device *dev, struct device_attribute *attr,
> }
> static DEVICE_ATTR_RO(status);
>
> +static ssize_t pld_show(struct device *dev, struct device_attribute *attr,
> + char *buf)
> +{
> + struct acpi_device *acpi_dev = to_acpi_device(dev);
> + acpi_status status;
> + struct acpi_pld_info *pld;
> +
> + status = acpi_get_physical_device_location(acpi_dev->handle, &pld);
> + if (ACPI_FAILURE(status))
> + return -ENODEV;
> +
> + return sprintf(buf, "GROUP_TOKEN=%u\n"
> + "GROUP_POSITION=%u\n"
> + "USER_VISIBLE=%u\n"
> + "DOCK=%u\n"
> + "BAY=%u\n"
> + "LID=%u\n"
> + "PANEL=%u\n"
> + "HORIZONTAL_POSITION=%u\n"
> + "VERTICAL_POSITION=%u\n"
> + "SHAPE=%u\n",
> + pld->group_token,
> + pld->group_position,
> + pld->user_visible,
> + pld->dock,
> + pld->bay,
> + pld->lid,
> + pld->panel,
> + pld->horizontal_position,
> + pld->vertical_position,
> + pld->shape);
> +}
> +static DEVICE_ATTR_RO(pld);
> +
> /**
> * acpi_device_setup_files - Create sysfs attributes of an ACPI device.
> * @dev: ACPI device object.
> @@ -595,6 +629,12 @@ int acpi_device_setup_files(struct acpi_device *dev)
> &dev_attr_real_power_state);
> }
>
> + if (acpi_has_method(dev->handle, "_PLD")) {
> + result = device_create_file(&dev->dev, &dev_attr_pld);
> + if (result)
> + goto end;
> + }
> +
> acpi_expose_nondev_subnodes(&dev->dev.kobj, &dev->data);
>
> end:
> @@ -645,4 +685,6 @@ void acpi_device_remove_files(struct acpi_device *dev)
> device_remove_file(&dev->dev, &dev_attr_status);
> if (dev->handle)
> device_remove_file(&dev->dev, &dev_attr_path);
> + if (acpi_has_method(dev->handle, "_PLD"))
> + device_remove_file(&dev->dev, &dev_attr_pld);
> }
> --
> 2.35.0.rc0.227.g00780c9af4-goog
>
--
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@xxxxxxxxxx
Chromium OS Project
bleung@xxxxxxxxxxxx
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