Tested-by: Matt Ranostay <matt.ranostay@xxxxxxxxx>
On Fri, Oct 23, 2015 at 8:33 AM, Daniel Baluta <daniel.baluta@xxxxxxxxx> wrote:
> This patch creates the IIO configfs root group. The group
> will appear under <mount-point>/iio/, usually /config/iio.
>
> We introduce configfs support in IIO in order to be able to easily
> create IIO objects from userspace. The first supported IIO objects
> are triggers introduced with next patches.
>
> Signed-off-by: Daniel Baluta <daniel.baluta@xxxxxxxxx>
> ---
> drivers/iio/Kconfig | 8 ++++++
> drivers/iio/Makefile | 1 +
> drivers/iio/industrialio-configfs.c | 50 +++++++++++++++++++++++++++++++++++++
> 3 files changed, 59 insertions(+)
> create mode 100644 drivers/iio/industrialio-configfs.c
>
> diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
> index 66792e7..d0f1ddb 100644
> --- a/drivers/iio/Kconfig
> +++ b/drivers/iio/Kconfig
> @@ -22,6 +22,14 @@ if IIO_BUFFER
> source "drivers/iio/buffer/Kconfig"
> endif # IIO_BUFFER
>
> +config IIO_CONFIGFS
> + tristate "Enable IIO configuration via configfs"
> + select CONFIGFS_FS
> + help
> + This allows configuring various IIO bits through configfs
> + (e.g. software triggers). For more info see
> + Documentation/iio/iio_configfs.txt.
> +
> config IIO_TRIGGER
> bool "Enable triggered sampling support"
> help
> diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
> index aeca726..4e8ac82 100644
> --- a/drivers/iio/Makefile
> +++ b/drivers/iio/Makefile
> @@ -7,6 +7,7 @@ industrialio-y := industrialio-core.o industrialio-event.o inkern.o
> industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o
> industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o
>
> +obj-$(CONFIG_IIO_CONFIGFS) += industrialio-configfs.o
> obj-$(CONFIG_IIO_TRIGGERED_EVENT) += industrialio-triggered-event.o
>
> obj-y += accel/
> diff --git a/drivers/iio/industrialio-configfs.c b/drivers/iio/industrialio-configfs.c
> new file mode 100644
> index 0000000..83563dd
> --- /dev/null
> +++ b/drivers/iio/industrialio-configfs.c
> @@ -0,0 +1,50 @@
> +/*
> + * Industrial I/O configfs bits
> + *
> + * Copyright (c) 2015 Intel Corporation
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License version 2 as published by
> + * the Free Software Foundation.
> + */
> +
> +#include <linux/configfs.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/kmod.h>
> +#include <linux/slab.h>
> +
> +#include <linux/iio/iio.h>
> +
> +static struct config_item_type iio_root_group_type = {
> + .ct_owner = THIS_MODULE,
> +};
> +
> +struct configfs_subsystem iio_configfs_subsys = {
> + .su_group = {
> + .cg_item = {
> + .ci_namebuf = "iio",
> + .ci_type = &iio_root_group_type,
> + },
> + },
> + .su_mutex = __MUTEX_INITIALIZER(iio_configfs_subsys.su_mutex),
> +};
> +EXPORT_SYMBOL(iio_configfs_subsys);
> +
> +static int __init iio_configfs_init(void)
> +{
> + config_group_init(&iio_configfs_subsys.su_group);
> +
> + return configfs_register_subsystem(&iio_configfs_subsys);
> +}
> +module_init(iio_configfs_init);
> +
> +static void __exit iio_configfs_exit(void)
> +{
> + configfs_unregister_subsystem(&iio_configfs_subsys);
> +}
> +module_exit(iio_configfs_exit);
> +
> +MODULE_AUTHOR("Daniel Baluta <daniel.baluta@xxxxxxxxx>");
> +MODULE_DESCRIPTION("Industrial I/O configfs support");
> +MODULE_LICENSE("GPL v2");
> --
> 1.9.1
>
> --
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