diff options
Diffstat (limited to 'drivers/extcon/of_extcon.c')
| -rw-r--r-- | drivers/extcon/of_extcon.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/extcon/of_extcon.c b/drivers/extcon/of_extcon.c new file mode 100644 index 000000000000..72173ecbb311 --- /dev/null +++ b/drivers/extcon/of_extcon.c @@ -0,0 +1,64 @@ +/* + * 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); |