112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/*
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* Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
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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 as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The full GNU General Public License is included in this distribution in the
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* file called COPYING.
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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 err = 0;
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idr_try_again:
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if (!idr_pre_get(&dca_idr, GFP_KERNEL))
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return -ENOMEM;
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spin_lock(&dca_idr_lock);
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err = idr_get_new(&dca_idr, dca, &dca->id);
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spin_unlock(&dca_idr_lock);
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switch (err) {
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case 0:
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break;
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case -EAGAIN:
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goto idr_try_again;
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default:
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return err;
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}
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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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