1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
 4 */
 5
 6#include <linux/kernel.h>
 7#include <linux/spinlock.h>
 8#include <linux/device.h>
 9#include <linux/idr.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>
15
16static const struct class dca_class = {
17	.name = "dca",
18};
19static struct idr dca_idr;
20static spinlock_t dca_idr_lock;
21
22int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
23{
24	struct device *cd;
25	static int req_count;
26
27	cd = device_create(&dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
28			   "requester%d", req_count++);
29	return PTR_ERR_OR_ZERO(cd);
30}
31
32void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
33{
34	device_destroy(&dca_class, MKDEV(0, slot + 1));
35}
36
37int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
38{
39	struct device *cd;
40	int ret;
41
42	idr_preload(GFP_KERNEL);
43	spin_lock(&dca_idr_lock);
44
45	ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT);
46	if (ret >= 0)
47		dca->id = ret;
48
49	spin_unlock(&dca_idr_lock);
50	idr_preload_end();
51	if (ret < 0)
52		return ret;
53
54	cd = device_create(&dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
55	if (IS_ERR(cd)) {
56		spin_lock(&dca_idr_lock);
57		idr_remove(&dca_idr, dca->id);
58		spin_unlock(&dca_idr_lock);
59		return PTR_ERR(cd);
60	}
61	dca->cd = cd;
62	return 0;
63}
64
65void dca_sysfs_remove_provider(struct dca_provider *dca)
66{
67	device_unregister(dca->cd);
68	dca->cd = NULL;
69	spin_lock(&dca_idr_lock);
70	idr_remove(&dca_idr, dca->id);
71	spin_unlock(&dca_idr_lock);
72}
73
74int __init dca_sysfs_init(void)
75{
76	int err;
77
78	idr_init(&dca_idr);
79	spin_lock_init(&dca_idr_lock);
80
81	err = class_register(&dca_class);
82	if (err) {
83		idr_destroy(&dca_idr);
84		return err;
85	}
86	return 0;
87}
88
89void __exit dca_sysfs_exit(void)
90{
91	class_unregister(&dca_class);
92	idr_destroy(&dca_idr);
93}
94

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved.
 4 */
 5
 6#include <linux/kernel.h>
 7#include <linux/spinlock.h>
 8#include <linux/device.h>
 9#include <linux/idr.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>
15
16static struct class *dca_class;
 
 
17static struct idr dca_idr;
18static spinlock_t dca_idr_lock;
19
20int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot)
21{
22	struct device *cd;
23	static int req_count;
24
25	cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL,
26			   "requester%d", req_count++);
27	return PTR_ERR_OR_ZERO(cd);
28}
29
30void dca_sysfs_remove_req(struct dca_provider *dca, int slot)
31{
32	device_destroy(dca_class, MKDEV(0, slot + 1));
33}
34
35int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev)
36{
37	struct device *cd;
38	int ret;
39
40	idr_preload(GFP_KERNEL);
41	spin_lock(&dca_idr_lock);
42
43	ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT);
44	if (ret >= 0)
45		dca->id = ret;
46
47	spin_unlock(&dca_idr_lock);
48	idr_preload_end();
49	if (ret < 0)
50		return ret;
51
52	cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id);
53	if (IS_ERR(cd)) {
54		spin_lock(&dca_idr_lock);
55		idr_remove(&dca_idr, dca->id);
56		spin_unlock(&dca_idr_lock);
57		return PTR_ERR(cd);
58	}
59	dca->cd = cd;
60	return 0;
61}
62
63void dca_sysfs_remove_provider(struct dca_provider *dca)
64{
65	device_unregister(dca->cd);
66	dca->cd = NULL;
67	spin_lock(&dca_idr_lock);
68	idr_remove(&dca_idr, dca->id);
69	spin_unlock(&dca_idr_lock);
70}
71
72int __init dca_sysfs_init(void)
73{
 
 
74	idr_init(&dca_idr);
75	spin_lock_init(&dca_idr_lock);
76
77	dca_class = class_create("dca");
78	if (IS_ERR(dca_class)) {
79		idr_destroy(&dca_idr);
80		return PTR_ERR(dca_class);
81	}
82	return 0;
83}
84
85void __exit dca_sysfs_exit(void)
86{
87	class_destroy(dca_class);
88	idr_destroy(&dca_idr);
89}
90