/* * OF helpers for External connector (extcon) framework * * Copyright (C) 2013 Texas Instruments, Inc. * Kishon Vijay Abraham I <kishon@ti.com> * * Copyright (C) 2013 Samsung Electronics * Chanwoo Choi <cw00.choi@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include <linux/module.h>#include <linux/slab.h>#include <linux/err.h>#include <linux/extcon.h>#include <linux/of.h>#include <linux/of_platform.h>#include <linux/extcon/of_extcon.h> /* * of_extcon_get_extcon_dev - Get the name of extcon device from devicetree * @dev - instance to the given device * @index - index into list of extcon_dev * * return the instance of extcon device */struct extcon_dev *of_extcon_get_extcon_dev(struct device *dev, int index){	struct device_node *node;	struct extcon_dev *edev;	struct platform_device *extcon_parent_dev; 	if (!dev->of_node) {		dev_dbg(dev, "device does not have a device node entry\n");		return ERR_PTR(-EINVAL);	} 	node = of_parse_phandle(dev->of_node, "extcon", index);	if (!node) {		dev_dbg(dev, "failed to get phandle in %s node\n",			dev->of_node->full_name);		return ERR_PTR(-ENODEV);	} 	extcon_parent_dev = of_find_device_by_node(node);	if (!extcon_parent_dev) {		dev_dbg(dev, "unable to find device by node\n");		return ERR_PTR(-EPROBE_DEFER);	} 	edev = extcon_get_extcon_dev(dev_name(&extcon_parent_dev->dev));	if (!edev) {		dev_dbg(dev, "unable to get extcon device : %s\n",				dev_name(&extcon_parent_dev->dev));		return ERR_PTR(-ENODEV);	} 	return edev;}EXPORT_SYMBOL_GPL(of_extcon_get_extcon_dev);