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6eee5b3b KVA |
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 | */ | |
31 | struct 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 | } | |
64 | EXPORT_SYMBOL_GPL(of_extcon_get_extcon_dev); |