1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/* dahdi-sysfs-chan.c
*
* Copyright (C) 2011-2012, Xorcom
* Copyright (C) 2011-2012, Digium, Inc.
*
* All rights reserved.
*
*/
/*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2 as published by the
* Free Software Foundation. See the LICENSE file included with
* this program for more details.
*/
#include <linux/version.h>
#define DAHDI_PRINK_MACROS_USE_debug
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <dahdi/kernel.h>
#include "dahdi.h"
#include "dahdi-sysfs.h"
/* shortcuts, for code readability */
#define MAKE_DAHDI_DEV(num, name) \
CLASS_DEV_CREATE(dahdi_class, MKDEV(DAHDI_MAJOR, num), NULL, name)
#define DEL_DAHDI_DEV(num) \
CLASS_DEV_DESTROY(dahdi_class, MKDEV(DAHDI_MAJOR, num))
static struct class *dahdi_class;
int chan_sysfs_create(struct dahdi_chan *chan)
{
char chan_name[32];
void *dummy;
int res = 0;
if (chan->channo >= 250)
return 0;
if (test_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags))
return 0;
snprintf(chan_name, sizeof(chan_name), "dahdi!%d", chan->channo);
dummy = (void *)MAKE_DAHDI_DEV(chan->channo, chan_name);
if (IS_ERR(dummy)) {
res = PTR_ERR(dummy);
chan_err(chan, "Failed creating sysfs device: %d\n",
res);
return res;
}
set_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags);
return 0;
}
void chan_sysfs_remove(struct dahdi_chan *chan)
{
if (!test_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags))
return;
DEL_DAHDI_DEV(chan->channo);
clear_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags);
}
/*
* Used by dahdi_transcode.c
*/
int dahdi_register_chardev(struct dahdi_chardev *dev)
{
static const char *DAHDI_STRING = "dahdi!";
char *udevname;
udevname = kzalloc(strlen(dev->name) + sizeof(DAHDI_STRING) + 1,
GFP_KERNEL);
if (!udevname)
return -ENOMEM;
strcpy(udevname, DAHDI_STRING);
strcat(udevname, dev->name);
MAKE_DAHDI_DEV(dev->minor, udevname);
kfree(udevname);
return 0;
}
EXPORT_SYMBOL(dahdi_register_chardev);
/*
* Used by dahdi_transcode.c
*/
int dahdi_unregister_chardev(struct dahdi_chardev *dev)
{
DEL_DAHDI_DEV(dev->minor);
return 0;
}
EXPORT_SYMBOL(dahdi_unregister_chardev);
/*--------- Sysfs Device handling ----*/
/*
* Describe fixed device files and maintain their
* pointer so fixed_devfiles_remove() can always be called
* and work cleanly
*/
static struct {
int minor;
char *name;
void *dev; /* FIXME: wrong type because of old kernels */
} fixed_minors[] = {
{ DAHDI_CTL, "dahdi!ctl", },
{ DAHDI_TIMER, "dahdi!timer", },
{ DAHDI_CHANNEL, "dahdi!channel",},
{ DAHDI_PSEUDO, "dahdi!pseudo", },
};
/*
* Removes /dev/dahdi/{ctl,timer,channel,pseudo}
*
* It is safe to call it during initialization error handling,
* as it skips non existing objects.
*/
static void fixed_devfiles_remove(void)
{
int i;
if (!dahdi_class)
return;
for (i = 0; i < ARRAY_SIZE(fixed_minors); i++) {
void *d = fixed_minors[i].dev;
if (d && !IS_ERR(d))
dahdi_dbg(DEVICES, "Removing fixed device file %s\n",
fixed_minors[i].name);
DEL_DAHDI_DEV(fixed_minors[i].minor);
}
}
/*
* Creates /dev/dahdi/{ctl,timer,channel,pseudo}
*/
static int fixed_devfiles_create(void)
{
int i;
int res = 0;
if (!dahdi_class) {
dahdi_err("%s: dahdi_class is not initialized yet!\n",
__func__);
res = -ENODEV;
goto cleanup;
}
for (i = 0; i < ARRAY_SIZE(fixed_minors); i++) {
char *name = fixed_minors[i].name;
int minor = fixed_minors[i].minor;
void *dummy;
dahdi_dbg(DEVICES, "Making fixed device file %s\n", name);
dummy = (void *)MAKE_DAHDI_DEV(minor, name);
if (IS_ERR(dummy)) {
int res = PTR_ERR(dummy);
dahdi_err("%s: failed (%d: %s). Error: %d\n",
__func__, minor, name, res);
goto cleanup;
}
fixed_minors[i].dev = dummy;
}
return 0;
cleanup:
fixed_devfiles_remove();
return res;
}
/*
* Called during driver unload and while handling any error during
* driver load.
* Always clean any (and only) objects that were initialized (invariant)
*/
static void sysfs_channels_cleanup(void)
{
fixed_devfiles_remove();
if (dahdi_class) {
dahdi_dbg(DEVICES, "Destroying DAHDI class:\n");
class_destroy(dahdi_class);
dahdi_class = NULL;
}
}
int __init dahdi_sysfs_chan_init(const struct file_operations *fops)
{
int res = 0;
dahdi_class = class_create(THIS_MODULE, "dahdi");
if (IS_ERR(dahdi_class)) {
res = PTR_ERR(dahdi_class);
dahdi_err("%s: class_create(dahi_chan) failed. Error: %d\n",
__func__, res);
goto cleanup;
}
res = fixed_devfiles_create();
if (res)
goto cleanup;
return 0;
cleanup:
sysfs_channels_cleanup();
return res;
}
void dahdi_sysfs_chan_exit(void)
{
sysfs_channels_cleanup();
}
|
