linux/drivers/extcon/of_extcon.c
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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);
  65
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