Commit | Line | Data |
---|---|---|
7589670f SN |
1 | #include <linux/kernel.h> |
2 | #include <linux/spinlock.h> | |
3 | #include <linux/device.h> | |
4 | #include <linux/idr.h> | |
5 | #include <linux/kdev_t.h> | |
6 | #include <linux/err.h> | |
7 | #include <linux/dca.h> | |
8 | ||
9 | static struct class *dca_class; | |
10 | static struct idr dca_idr; | |
11 | static spinlock_t dca_idr_lock; | |
12 | ||
13 | int dca_sysfs_add_req(struct dca_provider *dca, struct device *dev, int slot) | |
14 | { | |
765cdb6c | 15 | struct device *cd; |
7589670f | 16 | |
765cdb6c KS |
17 | cd = device_create(dca_class, dca->cd, MKDEV(0, slot + 1), |
18 | "requester%d", slot); | |
7589670f SN |
19 | if (IS_ERR(cd)) |
20 | return PTR_ERR(cd); | |
21 | return 0; | |
22 | } | |
23 | ||
24 | void dca_sysfs_remove_req(struct dca_provider *dca, int slot) | |
25 | { | |
765cdb6c | 26 | device_destroy(dca_class, MKDEV(0, slot + 1)); |
7589670f SN |
27 | } |
28 | ||
29 | int dca_sysfs_add_provider(struct dca_provider *dca, struct device *dev) | |
30 | { | |
765cdb6c | 31 | struct device *cd; |
7589670f SN |
32 | int err = 0; |
33 | ||
34 | idr_try_again: | |
35 | if (!idr_pre_get(&dca_idr, GFP_KERNEL)) | |
36 | return -ENOMEM; | |
37 | spin_lock(&dca_idr_lock); | |
38 | err = idr_get_new(&dca_idr, dca, &dca->id); | |
39 | spin_unlock(&dca_idr_lock); | |
40 | switch (err) { | |
41 | case 0: | |
42 | break; | |
43 | case -EAGAIN: | |
44 | goto idr_try_again; | |
45 | default: | |
46 | return err; | |
47 | } | |
48 | ||
765cdb6c | 49 | cd = device_create(dca_class, dev, MKDEV(0, 0), "dca%d", dca->id); |
7589670f SN |
50 | if (IS_ERR(cd)) { |
51 | spin_lock(&dca_idr_lock); | |
52 | idr_remove(&dca_idr, dca->id); | |
53 | spin_unlock(&dca_idr_lock); | |
54 | return PTR_ERR(cd); | |
55 | } | |
56 | dca->cd = cd; | |
57 | return 0; | |
58 | } | |
59 | ||
60 | void dca_sysfs_remove_provider(struct dca_provider *dca) | |
61 | { | |
765cdb6c | 62 | device_unregister(dca->cd); |
7589670f SN |
63 | dca->cd = NULL; |
64 | spin_lock(&dca_idr_lock); | |
65 | idr_remove(&dca_idr, dca->id); | |
66 | spin_unlock(&dca_idr_lock); | |
67 | } | |
68 | ||
69 | int __init dca_sysfs_init(void) | |
70 | { | |
71 | idr_init(&dca_idr); | |
72 | spin_lock_init(&dca_idr_lock); | |
73 | ||
74 | dca_class = class_create(THIS_MODULE, "dca"); | |
75 | if (IS_ERR(dca_class)) { | |
76 | idr_destroy(&dca_idr); | |
77 | return PTR_ERR(dca_class); | |
78 | } | |
79 | return 0; | |
80 | } | |
81 | ||
82 | void __exit dca_sysfs_exit(void) | |
83 | { | |
84 | class_destroy(dca_class); | |
85 | idr_destroy(&dca_idr); | |
86 | } | |
87 |