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>

diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index 6b8c77c97d40dece2f2477e69b064cbed48321a8..9509b8a4c5518ba9084c65c6522368d363f41aba 100644 (file)
--- 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 6769f2f43e868b489cd40c7d873916c0c4ecb4a2..39d119f18f2e5e4163c577755dd83752ea7c3307 100644 (file)
--- 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 (file)
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 <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");