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drivers/iio/industrialio-sw-trigger.c
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/* * The Industrial I/O core, software trigger functions * * 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/module.h> #include <linux/init.h> #include <linux/kmod.h> #include <linux/list.h> #include <linux/slab.h> #include <linux/iio/sw_trigger.h> |
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#include <linux/iio/configfs.h> |
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#include <linux/configfs.h> static struct config_group *iio_triggers_group; static struct config_item_type iio_trigger_type_group_type; static struct config_item_type iio_triggers_group_type = { .ct_owner = THIS_MODULE, }; static LIST_HEAD(iio_trigger_types_list); static DEFINE_MUTEX(iio_trigger_types_lock); static struct iio_sw_trigger_type *__iio_find_sw_trigger_type(const char *name, unsigned len) { struct iio_sw_trigger_type *t = NULL, *iter; list_for_each_entry(iter, &iio_trigger_types_list, list) if (!strcmp(iter->name, name)) { t = iter; break; } return t; } int iio_register_sw_trigger_type(struct iio_sw_trigger_type *t) { struct iio_sw_trigger_type *iter; int ret = 0; mutex_lock(&iio_trigger_types_lock); iter = __iio_find_sw_trigger_type(t->name, strlen(t->name)); if (iter) ret = -EBUSY; else list_add_tail(&t->list, &iio_trigger_types_list); mutex_unlock(&iio_trigger_types_lock); if (ret) return ret; t->group = configfs_register_default_group(iio_triggers_group, t->name, &iio_trigger_type_group_type); if (IS_ERR(t->group)) ret = PTR_ERR(t->group); return ret; } EXPORT_SYMBOL(iio_register_sw_trigger_type); void iio_unregister_sw_trigger_type(struct iio_sw_trigger_type *t) { struct iio_sw_trigger_type *iter; mutex_lock(&iio_trigger_types_lock); iter = __iio_find_sw_trigger_type(t->name, strlen(t->name)); if (iter) list_del(&t->list); mutex_unlock(&iio_trigger_types_lock); configfs_unregister_default_group(t->group); } EXPORT_SYMBOL(iio_unregister_sw_trigger_type); static struct iio_sw_trigger_type *iio_get_sw_trigger_type(const char *name) { struct iio_sw_trigger_type *t; mutex_lock(&iio_trigger_types_lock); t = __iio_find_sw_trigger_type(name, strlen(name)); if (t && !try_module_get(t->owner)) t = NULL; mutex_unlock(&iio_trigger_types_lock); return t; } struct iio_sw_trigger *iio_sw_trigger_create(const char *type, const char *name) { struct iio_sw_trigger *t; struct iio_sw_trigger_type *tt; tt = iio_get_sw_trigger_type(type); if (!tt) { pr_err("Invalid trigger type: %s ", type); return ERR_PTR(-EINVAL); } t = tt->ops->probe(name); if (IS_ERR(t)) goto out_module_put; t->trigger_type = tt; return t; out_module_put: module_put(tt->owner); return t; } EXPORT_SYMBOL(iio_sw_trigger_create); void iio_sw_trigger_destroy(struct iio_sw_trigger *t) { struct iio_sw_trigger_type *tt = t->trigger_type; tt->ops->remove(t); module_put(tt->owner); } EXPORT_SYMBOL(iio_sw_trigger_destroy); static struct config_group *trigger_make_group(struct config_group *group, const char *name) { struct iio_sw_trigger *t; t = iio_sw_trigger_create(group->cg_item.ci_name, name); if (IS_ERR(t)) return ERR_CAST(t); config_item_set_name(&t->group.cg_item, "%s", name); return &t->group; } static void trigger_drop_group(struct config_group *group, struct config_item *item) { struct iio_sw_trigger *t = to_iio_sw_trigger(item); iio_sw_trigger_destroy(t); config_item_put(item); } static struct configfs_group_operations trigger_ops = { .make_group = &trigger_make_group, .drop_item = &trigger_drop_group, }; static struct config_item_type iio_trigger_type_group_type = { .ct_group_ops = &trigger_ops, .ct_owner = THIS_MODULE, }; static int __init iio_sw_trigger_init(void) { iio_triggers_group = configfs_register_default_group(&iio_configfs_subsys.su_group, "triggers", &iio_triggers_group_type); |
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return PTR_ERR_OR_ZERO(iio_triggers_group); |
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} module_init(iio_sw_trigger_init); static void __exit iio_sw_trigger_exit(void) { configfs_unregister_default_group(iio_triggers_group); } module_exit(iio_sw_trigger_exit); MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>"); MODULE_DESCRIPTION("Industrial I/O software triggers support"); MODULE_LICENSE("GPL v2"); |