1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
6 #include <linux/kernel.h>
7 #include <linux/spinlock.h>
8 #include <linux/device.h>
10 #include <linux/kdev_t.h>
11 #include <linux/err.h>
12 #include <linux/dca.h>
13 #include <linux/gfp.h>
14 #include <linux/export.h>
16 static struct class *dca_class;
17 static struct idr dca_idr;
18 static spinlock_t dca_idr_lock;
20 int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
25 cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
26 "requester%d", req_count++);
32 void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
34 device_destroy(dca_class, MKDEV(0, slot + 1));
37 int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
42 idr_preload(GFP_KERNEL);
43 spin_lock(&dca_idr_lock);
45 ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT);
49 spin_unlock(&dca_idr_lock);
54 cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
56 spin_lock(&dca_idr_lock);
57 idr_remove(&dca_idr, dca->id);
58 spin_unlock(&dca_idr_lock);
65 void dca_sysfs_remove_provider(struct dca_provider *dca)
67 device_unregister(dca->cd);
69 spin_lock(&dca_idr_lock);
70 idr_remove(&dca_idr, dca->id);
71 spin_unlock(&dca_idr_lock);
74 int __init dca_sysfs_init(void)
77 spin_lock_init(&dca_idr_lock);
79 dca_class = class_create(THIS_MODULE, "dca");
80 if (IS_ERR(dca_class)) {
81 idr_destroy(&dca_idr);
82 return PTR_ERR(dca_class);
87 void __exit dca_sysfs_exit(void)
89 class_destroy(dca_class);
90 idr_destroy(&dca_idr);