[PATCH 3/8] media: v4l: fwnode: Support acpi devices for v4l2_fwnode_device_parse

[Ricardo Ribalda <ribalda@chromium.org>]

This patch modifies v4l2_fwnode_device_parse() to support ACPI devices.

We initially add support only for orientation via the ACPI _PLD method.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/v4l2-core/v4l2-fwnode.c | 58 +++++++++++++++++++++++++++++++----
 1 file changed, 52 insertions(+), 6 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
index cb153ce42c45d69600a3ec4e59a5584d7e791a2a..81563c36b6436bb61e1c96f2a5ede3fa9d64dab3 100644
--- a/drivers/media/v4l2-core/v4l2-fwnode.c
+++ b/drivers/media/v4l2-core/v4l2-fwnode.c
@@ -15,6 +15,7 @@
  * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
  */
 #include <linux/acpi.h>
+#include <acpi/acpi_bus.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/module.h>
@@ -807,16 +808,47 @@ int v4l2_fwnode_connector_add_link(struct fwnode_handle *fwnode,
 }
 EXPORT_SYMBOL_GPL(v4l2_fwnode_connector_add_link);
 
-int v4l2_fwnode_device_parse(struct device *dev,
-			     struct v4l2_fwnode_device_properties *props)
+static int v4l2_fwnode_device_parse_acpi(struct device *dev,
+					 struct v4l2_fwnode_device_properties *props)
+{
+	struct acpi_pld_info *pld;
+	int ret = 0;
+
+	if (!acpi_get_physical_device_location(ACPI_HANDLE(dev), &pld)) {
+		dev_dbg(dev, "acpi _PLD call failed\n");
+		return 0;
+	}
+
+	switch (pld->panel) {
+	case ACPI_PLD_PANEL_FRONT:
+		props->orientation = V4L2_FWNODE_ORIENTATION_FRONT;
+		break;
+	case ACPI_PLD_PANEL_BACK:
+		props->orientation = V4L2_FWNODE_ORIENTATION_BACK;
+		break;
+	case ACPI_PLD_PANEL_TOP:
+	case ACPI_PLD_PANEL_LEFT:
+	case ACPI_PLD_PANEL_RIGHT:
+	case ACPI_PLD_PANEL_UNKNOWN:
+		props->orientation = V4L2_FWNODE_ORIENTATION_EXTERNAL;
+		break;
+	default:
+		dev_dbg(dev, "Unknown _PLD panel val %d\n", pld->panel);
+		ret = -EINVAL;
+		break;
+	}
+
+	ACPI_FREE(pld);
+	return ret;
+}
+
+static int v4l2_fwnode_device_parse_dt(struct device *dev,
+				       struct v4l2_fwnode_device_properties *props)
 {
 	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	u32 val;
 	int ret;
 
-	memset(props, 0, sizeof(*props));
-
-	props->orientation = V4L2_FWNODE_PROPERTY_UNSET;
 	ret = fwnode_property_read_u32(fwnode, "orientation", &val);
 	if (!ret) {
 		switch (val) {
@@ -833,7 +865,6 @@ int v4l2_fwnode_device_parse(struct device *dev,
 		dev_dbg(dev, "device orientation: %u\n", val);
 	}
 
-	props->rotation = V4L2_FWNODE_PROPERTY_UNSET;
 	ret = fwnode_property_read_u32(fwnode, "rotation", &val);
 	if (!ret) {
 		if (val >= 360) {
@@ -847,6 +878,21 @@ int v4l2_fwnode_device_parse(struct device *dev,
 
 	return 0;
 }
+
+int v4l2_fwnode_device_parse(struct device *dev,
+			     struct v4l2_fwnode_device_properties *props)
+{
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
+
+	memset(props, 0, sizeof(*props));
+
+	props->orientation = V4L2_FWNODE_PROPERTY_UNSET;
+	props->rotation = V4L2_FWNODE_PROPERTY_UNSET;
+
+	if (is_acpi_device_node(fwnode))
+		return v4l2_fwnode_device_parse_acpi(dev, props);
+	return v4l2_fwnode_device_parse_dt(dev, props);
+}
 EXPORT_SYMBOL_GPL(v4l2_fwnode_device_parse);
 
 /*

-- 
2.49.0.504.g3bcea36a83-goog