linux-kernel - [PATCH] ACPI: device_sysfs: Add sysfs support for

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Date:   Wed, 26 Jan 2022 23:58:07 +0000
From:   Won Chung <wonchung@...gle.com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Benson Leung <bleung@...omium.org>,
        Prashant Malani <pmalani@...omium.org>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Won Chung <wonchung@...gle.com>
Subject: [PATCH] ACPI: device_sysfs: Add sysfs support for _PLD

When ACPI table includes _PLD fields for a device, create a new file
(pld) in sysfs to share _PLD fields.

Signed-off-by: Won Chung <wonchung@...gle.com>
---
 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