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![Thomas Gleixner](/assets/img/avatar_default.png)
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>
179 lines
4.1 KiB
C
179 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 IIO devices functions
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*
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* Copyright (c) 2016 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_device.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_devices_group;
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static const struct config_item_type iio_device_type_group_type;
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static const struct config_item_type iio_devices_group_type = {
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.ct_owner = THIS_MODULE,
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};
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static LIST_HEAD(iio_device_types_list);
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static DEFINE_MUTEX(iio_device_types_lock);
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static
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struct iio_sw_device_type *__iio_find_sw_device_type(const char *name,
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unsigned len)
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{
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struct iio_sw_device_type *d = NULL, *iter;
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list_for_each_entry(iter, &iio_device_types_list, list)
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if (!strcmp(iter->name, name)) {
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d = iter;
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break;
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}
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return d;
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}
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int iio_register_sw_device_type(struct iio_sw_device_type *d)
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{
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struct iio_sw_device_type *iter;
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int ret = 0;
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mutex_lock(&iio_device_types_lock);
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iter = __iio_find_sw_device_type(d->name, strlen(d->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(&d->list, &iio_device_types_list);
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mutex_unlock(&iio_device_types_lock);
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if (ret)
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return ret;
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d->group = configfs_register_default_group(iio_devices_group, d->name,
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&iio_device_type_group_type);
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if (IS_ERR(d->group))
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ret = PTR_ERR(d->group);
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return ret;
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}
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EXPORT_SYMBOL(iio_register_sw_device_type);
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void iio_unregister_sw_device_type(struct iio_sw_device_type *dt)
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{
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struct iio_sw_device_type *iter;
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mutex_lock(&iio_device_types_lock);
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iter = __iio_find_sw_device_type(dt->name, strlen(dt->name));
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if (iter)
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list_del(&dt->list);
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mutex_unlock(&iio_device_types_lock);
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configfs_unregister_default_group(dt->group);
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}
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EXPORT_SYMBOL(iio_unregister_sw_device_type);
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static
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struct iio_sw_device_type *iio_get_sw_device_type(const char *name)
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{
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struct iio_sw_device_type *dt;
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mutex_lock(&iio_device_types_lock);
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dt = __iio_find_sw_device_type(name, strlen(name));
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if (dt && !try_module_get(dt->owner))
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dt = NULL;
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mutex_unlock(&iio_device_types_lock);
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return dt;
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}
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struct iio_sw_device *iio_sw_device_create(const char *type, const char *name)
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{
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struct iio_sw_device *d;
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struct iio_sw_device_type *dt;
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dt = iio_get_sw_device_type(type);
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if (!dt) {
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pr_err("Invalid device type: %s\n", type);
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return ERR_PTR(-EINVAL);
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}
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d = dt->ops->probe(name);
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if (IS_ERR(d))
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goto out_module_put;
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d->device_type = dt;
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return d;
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out_module_put:
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module_put(dt->owner);
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return d;
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}
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EXPORT_SYMBOL(iio_sw_device_create);
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void iio_sw_device_destroy(struct iio_sw_device *d)
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{
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struct iio_sw_device_type *dt = d->device_type;
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dt->ops->remove(d);
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module_put(dt->owner);
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}
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EXPORT_SYMBOL(iio_sw_device_destroy);
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static struct config_group *device_make_group(struct config_group *group,
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const char *name)
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{
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struct iio_sw_device *d;
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d = iio_sw_device_create(group->cg_item.ci_name, name);
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if (IS_ERR(d))
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return ERR_CAST(d);
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config_item_set_name(&d->group.cg_item, "%s", name);
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return &d->group;
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}
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static void device_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_device *d = to_iio_sw_device(item);
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iio_sw_device_destroy(d);
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config_item_put(item);
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}
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static struct configfs_group_operations device_ops = {
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.make_group = &device_make_group,
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.drop_item = &device_drop_group,
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};
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static const struct config_item_type iio_device_type_group_type = {
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.ct_group_ops = &device_ops,
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.ct_owner = THIS_MODULE,
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};
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static int __init iio_sw_device_init(void)
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{
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iio_devices_group =
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configfs_register_default_group(&iio_configfs_subsys.su_group,
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"devices",
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&iio_devices_group_type);
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return PTR_ERR_OR_ZERO(iio_devices_group);
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}
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module_init(iio_sw_device_init);
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static void __exit iio_sw_device_exit(void)
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{
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configfs_unregister_default_group(iio_devices_group);
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}
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module_exit(iio_sw_device_exit);
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MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
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MODULE_DESCRIPTION("Industrial I/O software devices support");
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MODULE_LICENSE("GPL v2");
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