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| author | Daniel Baluta <daniel.baluta@intel.com> | 2015-11-09 08:13:59 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2015-12-03 19:19:24 +0100 |
| commit | 8261d961d1f397925d7a470864c14663d01ed714 (patch) | |
| tree | 7774c7357a96c84d123f88afe038c46c5a99db5f | |
| parent | Staging: iio: frequency: use dev_get_platdata() (diff) | |
| download | linux-8261d961d1f397925d7a470864c14663d01ed714.tar.xz linux-8261d961d1f397925d7a470864c14663d01ed714.zip | |
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: Daniel Baluta <daniel.baluta@intel.com>
Tested-by: Matt Ranostay <matt.ranostay@intel>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
| -rw-r--r-- | drivers/iio/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/iio/Makefile | 1 | ||||
| -rw-r--r-- | drivers/iio/industrialio-configfs.c | 50 |
3 files changed, 59 insertions, 0 deletions
diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig index 6b8c77c97d40..9509b8a4c551 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 6769f2f43e86..39d119f18f2e 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 000000000000..83563dd7fcf4 --- /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@intel.com>"); +MODULE_DESCRIPTION("Industrial I/O configfs support"); +MODULE_LICENSE("GPL v2"); |