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![Fengguang Wu](/assets/img/avatar_default.png)
drivers/iio/industrialio-sw-trigger.c:169:1-3: WARNING: PTR_ERR_OR_ZERO can be used Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR Generated by: scripts/coccinelle/api/ptr_ret.cocci Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Cc: Joel Becker <jlbec@evilplan.org> Cc: Lars-Peter Clausen <lars@metafoo.de> Cc: Christoph Hellwig <hch@lst.de> Cc: Hartmut Knaack <knaack.h@gmx.de> Cc: Octavian Purdila <octavian.purdila@intel.com> Cc: Paul Bolle <pebolle@tiscali.nl> Cc: Adriana Reus <adriana.reus@intel.com> Cc: Daniel Baluta <daniel.baluta@intel.com> Cc: Cristina Opriceana <cristina.opriceana@gmail.com> Cc: Peter Meerwald <pmeerw@pmeerw.net> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
182 lines
4.2 KiB
C
182 lines
4.2 KiB
C
/*
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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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* 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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#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 struct config_item_type iio_trigger_type_group_type;
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static 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 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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