tjh.dev
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1/*
2 * OF helpers for External connector (extcon) framework
3 *
4 * Copyright (C) 2013 Texas Instruments, Inc.
5 * Kishon Vijay Abraham I <kishon@ti.com>
6 *
7 * Copyright (C) 2013 Samsung Electronics
8 * Chanwoo Choi <cw00.choi@samsung.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16#include <linux/module.h>
17#include <linux/slab.h>
18#include <linux/err.h>
19#include <linux/extcon.h>
20#include <linux/of.h>
21#include <linux/of_platform.h>
22#include <linux/extcon/of_extcon.h>
23
24/*
25 * of_extcon_get_extcon_dev - Get the name of extcon device from devicetree
26 * @dev - instance to the given device
27 * @index - index into list of extcon_dev
28 *
29 * return the instance of extcon device
30 */
31struct extcon_dev *of_extcon_get_extcon_dev(struct device *dev, int index)
32{
33 struct device_node *node;
34 struct extcon_dev *edev;
35 struct platform_device *extcon_parent_dev;
36
37 if (!dev->of_node) {
38 dev_dbg(dev, "device does not have a device node entry\n");
39 return ERR_PTR(-EINVAL);
40 }
41
42 node = of_parse_phandle(dev->of_node, "extcon", index);
43 if (!node) {
44 dev_dbg(dev, "failed to get phandle in %s node\n",
45 dev->of_node->full_name);
46 return ERR_PTR(-ENODEV);
47 }
48
49 extcon_parent_dev = of_find_device_by_node(node);
50 if (!extcon_parent_dev) {
51 dev_dbg(dev, "unable to find device by node\n");
52 return ERR_PTR(-EPROBE_DEFER);
53 }
54
55 edev = extcon_get_extcon_dev(dev_name(&extcon_parent_dev->dev));
56 if (!edev) {
57 dev_dbg(dev, "unable to get extcon device : %s\n",
58 dev_name(&extcon_parent_dev->dev));
59 return ERR_PTR(-ENODEV);
60 }
61
62 return edev;
63}
64EXPORT_SYMBOL_GPL(of_extcon_get_extcon_dev);