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authorDaniel Baluta <daniel.baluta@intel.com>2015-11-09 09:13:59 +0200
committerJonathan Cameron <jic23@kernel.org>2015-12-03 18:19:24 +0000
commit8261d961d1f397925d7a470864c14663d01ed714 (patch)
tree7774c7357a96c84d123f88afe038c46c5a99db5f /drivers/iio
parent7221819ac48195ea9f1e179c3f812939319d9e7b (diff)
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>
Diffstat (limited to 'drivers/iio')
-rw-r--r--drivers/iio/Kconfig8
-rw-r--r--drivers/iio/Makefile1
-rw-r--r--drivers/iio/industrialio-configfs.c50
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");