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Commit 8261d961 authored by Daniel Baluta's avatar Daniel Baluta Committed by Jonathan Cameron
Browse files

iio: core: Introduce IIO configfs support 



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: default avatarDaniel Baluta <daniel.baluta@intel.com>
Tested-by: default avatarMatt Ranostay <matt.ranostay@intel>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 7221819a

drivers/iio/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -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

drivers/iio/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -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/

drivers/iio/industrialio-configfs.c

0 → 100644
+50 −0
Original line number Diff line number Diff line 
/*

 * 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@intel.com>");

MODULE_DESCRIPTION("Industrial I/O configfs support");

MODULE_LICENSE("GPL v2");