media: cec-notifier: add cec_notifier_parse_hdmi_phandle helper

#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>

	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);

#ifndef LINUX_CEC_NOTIFIER_H

#define LINUX_CEC_NOTIFIER_H

#include <linux/types.h>

#include <linux/err.h>

#include <media/cec.h>

struct device;

void cec_register_cec_notifier(struct cec_adapter *adap,

			       struct cec_notifier *notifier);

/**

 * cec_notifier_parse_hdmi_phandle - find the hdmi device from "hdmi-phandle"

 * @dev: the device with the "hdmi-phandle" device tree property

 *

 * Returns the device pointer referenced by the "hdmi-phandle" property.

 * Note that the refcount of the returned device is not incremented.

 * This device pointer is only used as a key value in the notifier

 * list, but it is never accessed by the CEC driver.

 */

struct device *cec_notifier_parse_hdmi_phandle(struct device *dev);

#else

static inline struct cec_notifier *cec_notifier_get_conn(struct device *dev,

							 const char *conn)

					     struct cec_notifier *notifier)

{

}

static inline struct device *cec_notifier_parse_hdmi_phandle(struct device *dev)

{

	return ERR_PTR(-ENODEV);

}

#endif

/**