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b2f0c09664
Use the IS_ENABLED() helper macro to ensure that the configfs group is
initialized either when configfs is built-in or when configfs is built as a
module. Otherwise software trigger creation will result in undefined
behaviour when configfs is built as a mdoule since the configfs group for
the trigger is not properly initialized.
Fixes: b662f809d4 ("iio: core: Introduce IIO software triggers")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/*
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* Industrial I/O software trigger interface
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*
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* Copyright (c) 2015 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*/
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#ifndef __IIO_SW_TRIGGER
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#define __IIO_SW_TRIGGER
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/iio/iio.h>
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#include <linux/configfs.h>
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#define module_iio_sw_trigger_driver(__iio_sw_trigger_type) \
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module_driver(__iio_sw_trigger_type, iio_register_sw_trigger_type, \
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iio_unregister_sw_trigger_type)
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struct iio_sw_trigger_ops;
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struct iio_sw_trigger_type {
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const char *name;
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struct module *owner;
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const struct iio_sw_trigger_ops *ops;
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struct list_head list;
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struct config_group *group;
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};
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struct iio_sw_trigger {
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struct iio_trigger *trigger;
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struct iio_sw_trigger_type *trigger_type;
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struct config_group group;
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};
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struct iio_sw_trigger_ops {
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struct iio_sw_trigger* (*probe)(const char *);
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int (*remove)(struct iio_sw_trigger *);
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};
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static inline
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struct iio_sw_trigger *to_iio_sw_trigger(struct config_item *item)
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{
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return container_of(to_config_group(item), struct iio_sw_trigger,
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group);
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}
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int iio_register_sw_trigger_type(struct iio_sw_trigger_type *tt);
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void iio_unregister_sw_trigger_type(struct iio_sw_trigger_type *tt);
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struct iio_sw_trigger *iio_sw_trigger_create(const char *, const char *);
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void iio_sw_trigger_destroy(struct iio_sw_trigger *);
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int iio_sw_trigger_type_configfs_register(struct iio_sw_trigger_type *tt);
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void iio_sw_trigger_type_configfs_unregister(struct iio_sw_trigger_type *tt);
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static inline
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void iio_swt_group_init_type_name(struct iio_sw_trigger *t,
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const char *name,
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struct config_item_type *type)
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{
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#if IS_ENABLED(CONFIG_CONFIGFS_FS)
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config_group_init_type_name(&t->group, name, type);
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#endif
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}
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#endif /* __IIO_SW_TRIGGER */
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