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path: root/drivers/media/cec/cec-notifier.c
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Diffstat (limited to 'drivers/media/cec/cec-notifier.c')
-rw-r--r--drivers/media/cec/cec-notifier.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c
index dd2078b27a41..9598c7778871 100644
--- a/drivers/media/cec/cec-notifier.c
+++ b/drivers/media/cec/cec-notifier.c
@@ -11,6 +11,7 @@
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/kref.h>
+#include <linux/of_platform.h>
#include <media/cec.h>
#include <media/cec-notifier.h>
@@ -127,3 +128,32 @@ void cec_notifier_unregister(struct cec_notifier *n)
cec_notifier_put(n);
}
EXPORT_SYMBOL_GPL(cec_notifier_unregister);
+
+struct device *cec_notifier_parse_hdmi_phandle(struct device *dev)
+{
+ struct platform_device *hdmi_pdev;
+ struct device *hdmi_dev = NULL;
+ struct device_node *np;
+
+ np = of_parse_phandle(dev->of_node, "hdmi-phandle", 0);
+
+ if (!np) {
+ dev_err(dev, "Failed to find HDMI node in device tree\n");
+ return ERR_PTR(-ENODEV);
+ }
+ hdmi_pdev = of_find_device_by_node(np);
+ of_node_put(np);
+ if (hdmi_pdev) {
+ hdmi_dev = &hdmi_pdev->dev;
+ /*
+ * Note that the device struct is only used as a key into the
+ * cec_notifiers list, it is never actually accessed.
+ * So we decrement the reference here so we don't leak
+ * memory.
+ */
+ put_device(hdmi_dev);
+ return hdmi_dev;
+ }
+ return ERR_PTR(-EPROBE_DEFER);
+}
+EXPORT_SYMBOL_GPL(cec_notifier_parse_hdmi_phandle);