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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++); | |
7589670f SN |
27 | if (IS_ERR(cd)) |
28 | return PTR_ERR(cd); | |
29 | return 0; | |
30 | } | |
31 | ||
32 | void dca_sysfs_remove_req(struct dca_provider *dca, int slot) | |
33 | { | |
765cdb6c | 34 | device_destroy(dca_class, MKDEV(0, slot + 1)); |
7589670f SN |
35 | } |
36 | ||
37 | int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev) | |
38 | { | |
765cdb6c | 39 | struct device *cd; |
615f2e5c | 40 | int ret; |
7589670f | 41 | |
615f2e5c | 42 | idr_preload(GFP_KERNEL); |
7589670f | 43 | spin_lock(&dca_idr_lock); |
615f2e5c TH |
44 | |
45 | ret = idr_alloc(&dca_idr, dca, 0, 0, GFP_NOWAIT); | |
46 | if (ret >= 0) | |
47 | dca->id = ret; | |
48 | ||
7589670f | 49 | spin_unlock(&dca_idr_lock); |
615f2e5c TH |
50 | idr_preload_end(); |
51 | if (ret < 0) | |
52 | return ret; | |
7589670f | 53 | |
a9b12619 | 54 | cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id); |
7589670f SN |
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 | ||
65 | void dca_sysfs_remove_provider(struct dca_provider *dca) | |
66 | { | |
765cdb6c | 67 | device_unregister(dca->cd); |
7589670f SN |
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 | ||
74 | int __init dca_sysfs_init(void) | |
75 | { | |
76 | idr_init(&dca_idr); | |
77 | spin_lock_init(&dca_idr_lock); | |
78 | ||
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); | |
83 | } | |
84 | return 0; | |
85 | } | |
86 | ||
87 | void __exit dca_sysfs_exit(void) | |
88 | { | |
89 | class_destroy(dca_class); | |
90 | idr_destroy(&dca_idr); | |
91 | } | |
92 |