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iio: core: Introduce IIO configfs support

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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@intel.com>
Tested-by: Matt Ranostay <matt.ranostay@intel>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta 2015-11-09 09:13:59 +02:00 committed by Jonathan Cameron
parent 7221819ac4
commit 8261d961d1
3 changed files with 59 additions and 0 deletions
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8
drivers/iio/Kconfig
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@ -22,6 +22,14 @@ if IIO_BUFFER
source "drivers/iio/buffer/Kconfig" source "drivers/iio/buffer/Kconfig"
endif # IIO_BUFFER 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 config IIO_TRIGGER
bool "Enable triggered sampling support" bool "Enable triggered sampling support"
help help

1
drivers/iio/Makefile
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@ -7,6 +7,7 @@ industrialio-y := industrialio-core.o industrialio-event.o inkern.o
industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o
industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o
obj-$(CONFIG_IIO_CONFIGFS) += industrialio-configfs.o
obj-$(CONFIG_IIO_TRIGGERED_EVENT) += industrialio-triggered-event.o obj-$(CONFIG_IIO_TRIGGERED_EVENT) += industrialio-triggered-event.o
obj-y += accel/ obj-y += accel/

50
drivers/iio/industrialio-configfs.c Normal file
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@ -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@intel.com>");
MODULE_DESCRIPTION("Industrial I/O configfs support");
MODULE_LICENSE("GPL v2");