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e62d9491 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
e2fc4d19 MS |
2 | /* |
3 | * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. | |
e2fc4d19 MS |
4 | */ |
5 | ||
7589670f SN |
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> | |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
3382416d | 14 | #include <linux/export.h> |
7589670f SN |
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 | { | |
765cdb6c | 22 | struct device *cd; |
7f1b358a | 23 | static int req_count; |
7589670f | 24 | |
a9b12619 GKH |
25 | cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL, |
26 | "requester%d", req_count++); | |
0548745f | 27 | return PTR_ERR_OR_ZERO(cd); |
7589670f SN |
28 | } |
29 | ||
30 | void dca_sysfs_remove_req(struct dca_provider *dca, int slot) | |
31 | { | |
765cdb6c | 32 | device_destroy(dca_class, MKDEV(0, slot + 1)); |
7589670f SN |
33 | } |
34 | ||
35 | int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev) | |
36 | { | |
765cdb6c | 37 | struct device *cd; |
615f2e5c | 38 | int ret; |
7589670f | 39 | |
615f2e5c | 40 | idr_preload(GFP_KERNEL); |
7589670f | 41 | spin_lock(&dca_idr_lock); |
615f2e5c TH |
42 | |
43 | ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT); | |
44 | if (ret >= 0) | |
45 | dca->id = ret; | |
46 | ||
7589670f | 47 | spin_unlock(&dca_idr_lock); |
615f2e5c TH |
48 | idr_preload_end(); |
49 | if (ret < 0) | |
50 | return ret; | |
7589670f | 51 | |
a9b12619 | 52 | cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id); |
7589670f SN |
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 | ||
63 | void dca_sysfs_remove_provider(struct dca_provider *dca) | |
64 | { | |
765cdb6c | 65 | device_unregister(dca->cd); |
7589670f SN |
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 | ||
72 | int __init dca_sysfs_init(void) | |
73 | { | |
74 | idr_init(&dca_idr); | |
75 | spin_lock_init(&dca_idr_lock); | |
76 | ||
1aaba11d | 77 | dca_class = class_create("dca"); |
7589670f SN |
78 | if (IS_ERR(dca_class)) { |
79 | idr_destroy(&dca_idr); | |
80 | return PTR_ERR(dca_class); | |
81 | } | |
82 | return 0; | |
83 | } | |
84 | ||
85 | void __exit dca_sysfs_exit(void) | |
86 | { | |
87 | class_destroy(dca_class); | |
88 | idr_destroy(&dca_idr); | |
89 | } | |
90 |