From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Baluta Subject: [PATCH v9 2/5] iio: core: Introduce IIO configfs support Date: Fri, 23 Oct 2015 15:32:35 +0300 Message-ID: <1445603558-27693-3-git-send-email-daniel.baluta@intel.com> References: <1445603558-27693-1-git-send-email-daniel.baluta@intel.com> Cc: knaack.h@gmx.de, linux-kernel@vger.kernel.org, octavian.purdila@intel.com, pebolle@tiscali.nl, patrick.porlan@intel.com, adriana.reus@intel.com, constantin.musca@intel.com, marten@intuitiveaerial.com, daniel.baluta@intel.com, cristina.opriceana@gmail.com, pmeerw@pmeerw.net, viro@zeniv.linux.org.uk, akpm@linux-foundation.org To: jic23@kernel.org, jlbec@evilplan.org, linux-iio@vger.kernel.org, linux-fsdevel@vger.kernel.org, lars@metafoo.de, hch@lst.de Return-path: In-Reply-To: <1445603558-27693-1-git-send-email-daniel.baluta@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org This patch creates the IIO configfs root group. The group will appear under /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 --- 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 +#include +#include +#include +#include + +#include + +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 "); +MODULE_DESCRIPTION("Industrial I/O configfs support"); +MODULE_LICENSE("GPL v2"); -- 1.9.1