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Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
180 lines
4.1 KiB
C
180 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* The Industrial I/O core, software trigger functions
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*
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* Copyright (c) 2015 Intel Corporation
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kmod.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/iio/sw_trigger.h>
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#include <linux/iio/configfs.h>
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#include <linux/configfs.h>
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static struct config_group *iio_triggers_group;
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static const struct config_item_type iio_trigger_type_group_type;
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static const struct config_item_type iio_triggers_group_type = {
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.ct_owner = THIS_MODULE,
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};
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static LIST_HEAD(iio_trigger_types_list);
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static DEFINE_MUTEX(iio_trigger_types_lock);
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static
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struct iio_sw_trigger_type *__iio_find_sw_trigger_type(const char *name,
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unsigned len)
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{
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struct iio_sw_trigger_type *t = NULL, *iter;
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list_for_each_entry(iter, &iio_trigger_types_list, list)
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if (!strcmp(iter->name, name)) {
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t = iter;
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break;
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}
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return t;
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}
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int iio_register_sw_trigger_type(struct iio_sw_trigger_type *t)
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{
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struct iio_sw_trigger_type *iter;
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int ret = 0;
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mutex_lock(&iio_trigger_types_lock);
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iter = __iio_find_sw_trigger_type(t->name, strlen(t->name));
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if (iter)
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ret = -EBUSY;
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else
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list_add_tail(&t->list, &iio_trigger_types_list);
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mutex_unlock(&iio_trigger_types_lock);
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if (ret)
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return ret;
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t->group = configfs_register_default_group(iio_triggers_group, t->name,
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&iio_trigger_type_group_type);
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if (IS_ERR(t->group))
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ret = PTR_ERR(t->group);
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return ret;
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}
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EXPORT_SYMBOL(iio_register_sw_trigger_type);
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void iio_unregister_sw_trigger_type(struct iio_sw_trigger_type *t)
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{
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struct iio_sw_trigger_type *iter;
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mutex_lock(&iio_trigger_types_lock);
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iter = __iio_find_sw_trigger_type(t->name, strlen(t->name));
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if (iter)
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list_del(&t->list);
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mutex_unlock(&iio_trigger_types_lock);
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configfs_unregister_default_group(t->group);
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}
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EXPORT_SYMBOL(iio_unregister_sw_trigger_type);
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static
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struct iio_sw_trigger_type *iio_get_sw_trigger_type(const char *name)
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{
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struct iio_sw_trigger_type *t;
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mutex_lock(&iio_trigger_types_lock);
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t = __iio_find_sw_trigger_type(name, strlen(name));
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if (t && !try_module_get(t->owner))
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t = NULL;
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mutex_unlock(&iio_trigger_types_lock);
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return t;
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}
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struct iio_sw_trigger *iio_sw_trigger_create(const char *type, const char *name)
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{
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struct iio_sw_trigger *t;
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struct iio_sw_trigger_type *tt;
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tt = iio_get_sw_trigger_type(type);
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if (!tt) {
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pr_err("Invalid trigger type: %s\n", type);
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return ERR_PTR(-EINVAL);
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}
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t = tt->ops->probe(name);
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if (IS_ERR(t))
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goto out_module_put;
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t->trigger_type = tt;
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return t;
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out_module_put:
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module_put(tt->owner);
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return t;
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}
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EXPORT_SYMBOL(iio_sw_trigger_create);
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void iio_sw_trigger_destroy(struct iio_sw_trigger *t)
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{
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struct iio_sw_trigger_type *tt = t->trigger_type;
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tt->ops->remove(t);
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module_put(tt->owner);
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}
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EXPORT_SYMBOL(iio_sw_trigger_destroy);
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static struct config_group *trigger_make_group(struct config_group *group,
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const char *name)
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{
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struct iio_sw_trigger *t;
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t = iio_sw_trigger_create(group->cg_item.ci_name, name);
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if (IS_ERR(t))
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return ERR_CAST(t);
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config_item_set_name(&t->group.cg_item, "%s", name);
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return &t->group;
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}
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static void trigger_drop_group(struct config_group *group,
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struct config_item *item)
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{
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struct iio_sw_trigger *t = to_iio_sw_trigger(item);
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iio_sw_trigger_destroy(t);
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config_item_put(item);
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}
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static struct configfs_group_operations trigger_ops = {
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.make_group = &trigger_make_group,
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.drop_item = &trigger_drop_group,
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};
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static const struct config_item_type iio_trigger_type_group_type = {
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.ct_group_ops = &trigger_ops,
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.ct_owner = THIS_MODULE,
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};
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static int __init iio_sw_trigger_init(void)
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{
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iio_triggers_group =
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configfs_register_default_group(&iio_configfs_subsys.su_group,
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"triggers",
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&iio_triggers_group_type);
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return PTR_ERR_OR_ZERO(iio_triggers_group);
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}
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module_init(iio_sw_trigger_init);
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static void __exit iio_sw_trigger_exit(void)
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{
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configfs_unregister_default_group(iio_triggers_group);
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}
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module_exit(iio_sw_trigger_exit);
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MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
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MODULE_DESCRIPTION("Industrial I/O software triggers support");
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MODULE_LICENSE("GPL v2");
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