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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* bebob_hwdep.c - a part of driver for BeBoB based devices
*
* Copyright (c) 2013-2014 Takashi Sakamoto
*/
/*
* This codes give three functionality.
*
* 1.get firewire node infomation
* 2.get notification about starting/stopping stream
* 3.lock/unlock stream
*/
#include "bebob.h"
static long
hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
loff_t *offset)
{
struct snd_bebob *bebob = hwdep->private_data;
DEFINE_WAIT(wait);
union snd_firewire_event event;
spin_lock_irq(&bebob->lock);
while (!bebob->dev_lock_changed) {
prepare_to_wait(&bebob->hwdep_wait, &wait, TASK_INTERRUPTIBLE);
spin_unlock_irq(&bebob->lock);
schedule();
finish_wait(&bebob->hwdep_wait, &wait);
if (signal_pending(current))
return -ERESTARTSYS;
spin_lock_irq(&bebob->lock);
}
memset(&event, 0, sizeof(event));
count = min_t(long, count, sizeof(event.lock_status));
if (bebob->dev_lock_changed) {
event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS;
event.lock_status.status = (bebob->dev_lock_count > 0);
bebob->dev_lock_changed = false;
}
spin_unlock_irq(&bebob->lock);
if (copy_to_user(buf, &event, count))
return -EFAULT;
return count;
}
static __poll_t
hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait)
{
struct snd_bebob *bebob = hwdep->private_data;
__poll_t events;
poll_wait(file, &bebob->hwdep_wait, wait);
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_changed)
events = EPOLLIN | EPOLLRDNORM;
else
events = 0;
spin_unlock_irq(&bebob->lock);
return events;
}
static int
hwdep_get_info(struct snd_bebob *bebob, void __user *arg)
{
struct fw_device *dev = fw_parent_device(bebob->unit);
struct snd_firewire_get_info info;
memset(&info, 0, sizeof(info));
info.type = SNDRV_FIREWIRE_TYPE_BEBOB;
info.card = dev->card->index;
*(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]);
*(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]);
strlcpy(info.device_name, dev_name(&dev->device),
sizeof(info.device_name));
if (copy_to_user(arg, &info, sizeof(info)))
return -EFAULT;
return 0;
}
static int
hwdep_lock(struct snd_bebob *bebob)
{
int err;
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_count == 0) {
bebob->dev_lock_count = -1;
err = 0;
} else {
err = -EBUSY;
}
spin_unlock_irq(&bebob->lock);
return err;
}
static int
hwdep_unlock(struct snd_bebob *bebob)
{
int err;
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_count == -1) {
bebob->dev_lock_count = 0;
err = 0;
} else {
err = -EBADFD;
}
spin_unlock_irq(&bebob->lock);
return err;
}
static int
hwdep_release(struct snd_hwdep *hwdep, struct file *file)
{
struct snd_bebob *bebob = hwdep->private_data;
spin_lock_irq(&bebob->lock);
if (bebob->dev_lock_count == -1)
bebob->dev_lock_count = 0;
spin_unlock_irq(&bebob->lock);
return 0;
}
static int
hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct snd_bebob *bebob = hwdep->private_data;
switch (cmd) {
case SNDRV_FIREWIRE_IOCTL_GET_INFO:
return hwdep_get_info(bebob, (void __user *)arg);
case SNDRV_FIREWIRE_IOCTL_LOCK:
return hwdep_lock(bebob);
case SNDRV_FIREWIRE_IOCTL_UNLOCK:
return hwdep_unlock(bebob);
default:
return -ENOIOCTLCMD;
}
}
#ifdef CONFIG_COMPAT
static int
hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file,
unsigned int cmd, unsigned long arg)
{
return hwdep_ioctl(hwdep, file, cmd,
(unsigned long)compat_ptr(arg));
}
#else
#define hwdep_compat_ioctl NULL
#endif
int snd_bebob_create_hwdep_device(struct snd_bebob *bebob)
{
static const struct snd_hwdep_ops ops = {
.read = hwdep_read,
.release = hwdep_release,
.poll = hwdep_poll,
.ioctl = hwdep_ioctl,
.ioctl_compat = hwdep_compat_ioctl,
};
struct snd_hwdep *hwdep;
int err;
err = snd_hwdep_new(bebob->card, "BeBoB", 0, &hwdep);
if (err < 0)
goto end;
strcpy(hwdep->name, "BeBoB");
hwdep->iface = SNDRV_HWDEP_IFACE_FW_BEBOB;
hwdep->ops = ops;
hwdep->private_data = bebob;
hwdep->exclusive = true;
end:
return err;
}
|
