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e2fc4d19 MS |
1 | /* |
2 | * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU General Public License as published by the Free | |
6 | * Software Foundation; either version 2 of the License, or (at your option) | |
7 | * any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program; if not, write to the Free Software Foundation, Inc., 59 | |
16 | * Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * The full GNU General Public License is included in this distribution in the | |
19 | * file called COPYING. | |
20 | */ | |
21 | ||
7589670f SN |
22 | #include <linux/kernel.h> |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/device.h> | |
25 | #include <linux/idr.h> | |
26 | #include <linux/kdev_t.h> | |
27 | #include <linux/err.h> | |
28 | #include <linux/dca.h> | |
29 | ||
30 | static struct class *dca_class; | |
31 | static struct idr dca_idr; | |
32 | static spinlock_t dca_idr_lock; | |
33 | ||
34 | int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot) | |
35 | { | |
765cdb6c | 36 | struct device *cd; |
7f1b358a | 37 | static int req_count; |
7589670f | 38 | |
a9b12619 GKH |
39 | cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), NULL, |
40 | "requester%d", req_count++); | |
7589670f SN |
41 | if (IS_ERR(cd)) |
42 | return PTR_ERR(cd); | |
43 | return 0; | |
44 | } | |
45 | ||
46 | void dca_sysfs_remove_req(struct dca_provider *dca, int slot) | |
47 | { | |
765cdb6c | 48 | device_destroy(dca_class, MKDEV(0, slot + 1)); |
7589670f SN |
49 | } |
50 | ||
51 | int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev) | |
52 | { | |
765cdb6c | 53 | struct device *cd; |
7589670f SN |
54 | int err = 0; |
55 | ||
56 | idr_try_again: | |
57 | if (!idr_pre_get(&dca_idr, GFP_KERNEL)) | |
58 | return -ENOMEM; | |
59 | spin_lock(&dca_idr_lock); | |
60 | err = idr_get_new(&dca_idr, dca, &dca->id); | |
61 | spin_unlock(&dca_idr_lock); | |
62 | switch (err) { | |
63 | case 0: | |
64 | break; | |
65 | case -EAGAIN: | |
66 | goto idr_try_again; | |
67 | default: | |
68 | return err; | |
69 | } | |
70 | ||
a9b12619 | 71 | cd = device_create(dca_class, dev, MKDEV(0, 0), NULL, "dca%d", dca->id); |
7589670f SN |
72 | if (IS_ERR(cd)) { |
73 | spin_lock(&dca_idr_lock); | |
74 | idr_remove(&dca_idr, dca->id); | |
75 | spin_unlock(&dca_idr_lock); | |
76 | return PTR_ERR(cd); | |
77 | } | |
78 | dca->cd = cd; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | void dca_sysfs_remove_provider(struct dca_provider *dca) | |
83 | { | |
765cdb6c | 84 | device_unregister(dca->cd); |
7589670f SN |
85 | dca->cd = NULL; |
86 | spin_lock(&dca_idr_lock); | |
87 | idr_remove(&dca_idr, dca->id); | |
88 | spin_unlock(&dca_idr_lock); | |
89 | } | |
90 | ||
91 | int __init dca_sysfs_init(void) | |
92 | { | |
93 | idr_init(&dca_idr); | |
94 | spin_lock_init(&dca_idr_lock); | |
95 | ||
96 | dca_class = class_create(THIS_MODULE, "dca"); | |
97 | if (IS_ERR(dca_class)) { | |
98 | idr_destroy(&dca_idr); | |
99 | return PTR_ERR(dca_class); | |
100 | } | |
101 | return 0; | |
102 | } | |
103 | ||
104 | void __exit dca_sysfs_exit(void) | |
105 | { | |
106 | class_destroy(dca_class); | |
107 | idr_destroy(&dca_idr); | |
108 | } | |
109 |