device: add base abstraction for all devices
Felix Kopp
3 years ago
parent
56c76d8b4b
commit
256b49b529
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/* SPDX-License-Identifier: BSD-3-Clause */
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/* See the end of this file for copyright, licensing, and warranty information. */
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#pragma once
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#include <ardix/kent.h>
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#include <ardix/list.h>
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#include <ardix/malloc.h>
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#include <ardix/types.h>
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#include <stddef.h>
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/** Top-level abstraction for any device connected to the system. */
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struct device {
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struct kent kent;
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};
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/** Cast a kent out to its containing struct device */
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#define to_device(ptr) container_of(ptr, struct device, kent)
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extern struct kent *devices_kent;
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/** Initialize the devices subsystem. */
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int devices_init(void);
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/**
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* Initialize a device and add it to the device tree.
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*
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* @param dev: device to initialze
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* @param parent: parent device (may me `NULL` if unapplicable)
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* @returns 0 on success, or a negative error code on failure
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*/
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int device_init(struct device *dev, struct device *parent);
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/** Increment a device's reference counter. */
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inline void device_get(struct device *dev)
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{
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kent_get(&dev->kent);
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}
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/** Decrement a device's referece counter. */
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inline void device_put(struct device *dev)
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{
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kent_put(&dev->kent);
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}
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/*
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* Copyright (c) 2021 Felix Kopp <sandtler@sandtler.club>
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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@ -0,0 +1,59 @@
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/* SPDX-License-Identifier: BSD-3-Clause */
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/* See the end of this file for copyright, licensing, and warranty information. */
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#include <ardix/device.h>
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#include <ardix/kent.h>
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#include <ardix/list.h>
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#include <ardix/malloc.h>
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#include <ardix/types.h>
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#include <errno.h>
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#include <stddef.h>
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struct kent *devices_kent = NULL;
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/** Initialize the devices subsystem. */
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int devices_init(void)
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{
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if (devices_kent != NULL)
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return -EEXIST;
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devices_kent = malloc(sizeof(*devices_kent));
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if (devices_kent == NULL)
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return -ENOMEM;
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return kent_init(NULL, devices_kent);
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}
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int device_init(struct device *dev, struct device *parent)
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{
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if (devices_kent == NULL)
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return -ENOENT;
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return kent_init(devices_kent, &dev->kent);
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}
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/*
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* Copyright (c) 2021 Felix Kopp <sandtler@sandtler.club>
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors may be
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* used to endorse or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
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* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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