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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677787980818283848586878889909192939495// SPDX-License-Identifier: GPL-2.0-or-later/* * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. */
#include <linux/kernel.h>#include <linux/spinlock.h>#include <linux/device.h>#include <linux/idr.h>#include <linux/kdev_t.h>#include <linux/err.h>#include <linux/dca.h>#include <linux/gfp.h>#include <linux/export.h>
static const struct class dca_class = { .name = "dca",};static struct idr dca_idr;static spinlock_t dca_idr_lock;
int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot){ struct device *cd; static int req_count;
cd = device_create(&dca_class, dca->cd, MKDEV(0, slot + 1), NULL, "requester%d", req_count++); return PTR_ERR_OR_ZERO(cd);}
void dca_sysfs_remove_req(struct dca_provider *dca, int slot){ device_destroy(&dca_class, MKDEV(0, slot + 1));}
int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev){ struct device *cd; int ret;
idr_preload(GFP_KERNEL); spin_lock(&dca_idr_lock);
ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT); if (ret >= 0) dca->id = ret;
spin_unlock(&dca_idr_lock); idr_preload_end(); if (ret < 0) return ret;
cd = device_create(&dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id); if (IS_ERR(cd)) { spin_lock(&dca_idr_lock); idr_remove(&dca_idr, dca->id); spin_unlock(&dca_idr_lock); return PTR_ERR(cd); } dca->cd = cd; return 0;}
void dca_sysfs_remove_provider(struct dca_provider *dca){ device_unregister(dca->cd); dca->cd = NULL; spin_lock(&dca_idr_lock); idr_remove(&dca_idr, dca->id); spin_unlock(&dca_idr_lock);}
int __init dca_sysfs_init(void){ int err;
idr_init(&dca_idr); spin_lock_init(&dca_idr_lock);
err = class_register(&dca_class); if (err) { idr_destroy(&dca_idr); return err; } return 0;}
void __exit dca_sysfs_exit(void){ class_unregister(&dca_class); idr_destroy(&dca_idr);}