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