Re: [PATCH] extcon: Add an API to get extcon device from dt node

[anish singh <anish198519851985@gmail.com>]

On Wed, Jun 12, 2013 at 7:09 AM, Chanwoo Choi <cw00.choi@samsung.com> wrote:
> From: Kishon Vijay Abraham I <kishon@ti.com>
>
> Added an API of_extcon_get_extcon_dev() to be used by drivers to get
> extcon device in the case of dt boot (this can be used instead of
> extcon_get_extcon_dev()).
>
> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
> Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
> ---
>  drivers/extcon/Makefile          |  3 +++
>  drivers/extcon/of-extcon.c       | 56 ++++++++++++++++++++++++++++++++++++++++
>  include/linux/extcon/of-extcon.h | 30 +++++++++++++++++++++
>  3 files changed, 89 insertions(+)
>  create mode 100644 drivers/extcon/of-extcon.c
>  create mode 100644 include/linux/extcon/of-extcon.h
>
> diff --git a/drivers/extcon/Makefile b/drivers/extcon/Makefile
> index 540e2c3..39cdf95 100644
> --- a/drivers/extcon/Makefile
> +++ b/drivers/extcon/Makefile
> @@ -2,9 +2,12 @@
>  # Makefile for external connector class (extcon) devices
>  #
>
> +obj-$(CONFIG_OF)               += of-extcon.o
> +
>  obj-$(CONFIG_EXTCON)           += extcon-class.o
>  obj-$(CONFIG_EXTCON_GPIO)      += extcon-gpio.o
>  obj-$(CONFIG_EXTCON_ADC_JACK)  += extcon-adc-jack.o
> +
>  obj-$(CONFIG_EXTCON_MAX77693)  += extcon-max77693.o
>  obj-$(CONFIG_EXTCON_MAX8997)   += extcon-max8997.o
>  obj-$(CONFIG_EXTCON_ARIZONA)   += extcon-arizona.o
> diff --git a/drivers/extcon/of-extcon.c b/drivers/extcon/of-extcon.c
> new file mode 100644
> index 0000000..29f82b4
> --- /dev/null
> +++ b/drivers/extcon/of-extcon.c
> @@ -0,0 +1,56 @@
> +/*
> + * 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/extcon.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/extcon/of-extcon.h>
> +
> +struct extcon_dev *of_extcon_get_extcon_dev(struct device *dev, int index)
Can this be simpler name? of_extcon_get_dev or something like that?
> +{
> +       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);
> diff --git a/include/linux/extcon/of-extcon.h b/include/linux/extcon/of-extcon.h
> new file mode 100644
> index 0000000..77d01ba
> --- /dev/null
> +++ b/include/linux/extcon/of-extcon.h
> @@ -0,0 +1,30 @@
> +/*
> + * 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.
> + */
> +
> +#ifndef __LINUX_OF_EXTCON_H
> +#define __LINUX_OF_EXTCON_H
> +
> +#if defined(CONFIG_OF)
> +extern struct extcon_dev
> +       *of_extcon_get_extcon_dev(struct device *dev, int index);
> +#else
> +static inline struct extcon_dev
> +       *of_extcon_get_extcon_dev(struct device *dev, int index);
> +{
> +       return NULL;
> +}
> +#endif /* CONFIG_OF */
> +
> +#endif /* __LINUX_OF_EXTCON_H */
> --
> 1.8.0
>