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 | |
16 | static struct class *dca_class; |
17 | static struct idr dca_idr; |
18 | static spinlock_t dca_idr_lock; |
19 | |
20 | int 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(cls: dca_class, parent: dca->cd, MKDEV(0, slot + 1), NULL, |
26 | fmt: "requester%d" , req_count++); |
27 | return PTR_ERR_OR_ZERO(ptr: cd); |
28 | } |
29 | |
30 | void dca_sysfs_remove_req(struct dca_provider *dca, int slot) |
31 | { |
32 | device_destroy(cls: dca_class, MKDEV(0, slot + 1)); |
33 | } |
34 | |
35 | int 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(lock: &dca_idr_lock); |
42 | |
43 | ret = idr_alloc(&dca_idr, ptr: dca, start: 0, end: 0, GFP_NOWAIT); |
44 | if (ret >= 0) |
45 | dca->id = ret; |
46 | |
47 | spin_unlock(lock: &dca_idr_lock); |
48 | idr_preload_end(); |
49 | if (ret < 0) |
50 | return ret; |
51 | |
52 | cd = device_create(cls: dca_class, parent: dev, MKDEV(0, 0), NULL, fmt: "dca%d" , dca->id); |
53 | if (IS_ERR(ptr: cd)) { |
54 | spin_lock(lock: &dca_idr_lock); |
55 | idr_remove(&dca_idr, id: dca->id); |
56 | spin_unlock(lock: &dca_idr_lock); |
57 | return PTR_ERR(ptr: cd); |
58 | } |
59 | dca->cd = cd; |
60 | return 0; |
61 | } |
62 | |
63 | void dca_sysfs_remove_provider(struct dca_provider *dca) |
64 | { |
65 | device_unregister(dev: dca->cd); |
66 | dca->cd = NULL; |
67 | spin_lock(lock: &dca_idr_lock); |
68 | idr_remove(&dca_idr, id: dca->id); |
69 | spin_unlock(lock: &dca_idr_lock); |
70 | } |
71 | |
72 | int __init dca_sysfs_init(void) |
73 | { |
74 | idr_init(idr: &dca_idr); |
75 | spin_lock_init(&dca_idr_lock); |
76 | |
77 | dca_class = class_create(name: "dca" ); |
78 | if (IS_ERR(ptr: dca_class)) { |
79 | idr_destroy(&dca_idr); |
80 | return PTR_ERR(ptr: dca_class); |
81 | } |
82 | return 0; |
83 | } |
84 | |
85 | void __exit dca_sysfs_exit(void) |
86 | { |
87 | class_destroy(cls: dca_class); |
88 | idr_destroy(&dca_idr); |
89 | } |
90 | |
91 | |