e62d949103
Based on 1 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 as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa the full gnu general public license is included in this distribution in the file called copying extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 7 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520170857.277062491@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/idr.h>
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#include <linux/kdev_t.h>
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#include <linux/err.h>
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#include <linux/dca.h>
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#include <linux/gfp.h>
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#include <linux/export.h>
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static struct class *dca_class;
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static struct idr dca_idr;
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static spinlock_t dca_idr_lock;
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int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
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{
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struct device *cd;
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static int req_count;
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cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
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"requester%d", req_count++);
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if (IS_ERR(cd))
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return PTR_ERR(cd);
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return 0;
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}
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void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
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{
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device_destroy(dca_class, MKDEV(0, slot + 1));
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}
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int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
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{
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struct device *cd;
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int ret;
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idr_preload(GFP_KERNEL);
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spin_lock(&dca_idr_lock);
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ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT);
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if (ret >= 0)
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dca->id = ret;
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spin_unlock(&dca_idr_lock);
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idr_preload_end();
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if (ret < 0)
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return ret;
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cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
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if (IS_ERR(cd)) {
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spin_lock(&dca_idr_lock);
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idr_remove(&dca_idr, dca->id);
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spin_unlock(&dca_idr_lock);
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return PTR_ERR(cd);
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}
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dca->cd = cd;
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return 0;
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}
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void dca_sysfs_remove_provider(struct dca_provider *dca)
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{
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device_unregister(dca->cd);
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dca->cd = NULL;
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spin_lock(&dca_idr_lock);
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idr_remove(&dca_idr, dca->id);
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spin_unlock(&dca_idr_lock);
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}
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int __init dca_sysfs_init(void)
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{
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idr_init(&dca_idr);
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spin_lock_init(&dca_idr_lock);
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dca_class = class_create(THIS_MODULE, "dca");
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if (IS_ERR(dca_class)) {
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idr_destroy(&dca_idr);
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return PTR_ERR(dca_class);
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}
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return 0;
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}
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void __exit dca_sysfs_exit(void)
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{
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class_destroy(dca_class);
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idr_destroy(&dca_idr);
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}
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