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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* ALSA interface to cobalt PCM capture streams
*
* Copyright 2014-2015 Cisco Systems, Inc. and/or its affiliates.
* All rights reserved.
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <media/v4l2-device.h>
#include <sound/core.h>
#include <sound/initval.h>
#include "cobalt-driver.h"
#include "cobalt-alsa.h"
#include "cobalt-alsa-pcm.h"
static void snd_cobalt_card_free(struct snd_cobalt_card *cobsc)
{
if (cobsc == NULL)
return;
cobsc->s->alsa = NULL;
kfree(cobsc);
}
static void snd_cobalt_card_private_free(struct snd_card *sc)
{
if (sc == NULL)
return;
snd_cobalt_card_free(sc->private_data);
sc->private_data = NULL;
sc->private_free = NULL;
}
static int snd_cobalt_card_create(struct cobalt_stream *s,
struct snd_card *sc,
struct snd_cobalt_card **cobsc)
{
*cobsc = kzalloc(sizeof(struct snd_cobalt_card), GFP_KERNEL);
if (*cobsc == NULL)
return -ENOMEM;
(*cobsc)->s = s;
(*cobsc)->sc = sc;
sc->private_data = *cobsc;
sc->private_free = snd_cobalt_card_private_free;
return 0;
}
static int snd_cobalt_card_set_names(struct snd_cobalt_card *cobsc)
{
struct cobalt_stream *s = cobsc->s;
struct cobalt *cobalt = s->cobalt;
struct snd_card *sc = cobsc->sc;
/* sc->driver is used by alsa-lib's configurator: simple, unique */
strscpy(sc->driver, "cobalt", sizeof(sc->driver));
/* sc->shortname is a symlink in /proc/asound: COBALT-M -> cardN */
snprintf(sc->shortname, sizeof(sc->shortname), "cobalt-%d-%d",
cobalt->instance, s->video_channel);
/* sc->longname is read from /proc/asound/cards */
snprintf(sc->longname, sizeof(sc->longname),
"Cobalt %d HDMI %d",
cobalt->instance, s->video_channel);
return 0;
}
int cobalt_alsa_init(struct cobalt_stream *s)
{
struct cobalt *cobalt = s->cobalt;
struct snd_card *sc = NULL;
struct snd_cobalt_card *cobsc;
int ret;
/* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
/* (1) Check and increment the device index */
/* This is a no-op for us. We'll use the cobalt->instance */
/* (2) Create a card instance */
ret = snd_card_new(&cobalt->pci_dev->dev, SNDRV_DEFAULT_IDX1,
SNDRV_DEFAULT_STR1, THIS_MODULE, 0, &sc);
if (ret) {
cobalt_err("snd_card_new() failed with err %d\n", ret);
goto err_exit;
}
/* (3) Create a main component */
ret = snd_cobalt_card_create(s, sc, &cobsc);
if (ret) {
cobalt_err("snd_cobalt_card_create() failed with err %d\n",
ret);
goto err_exit_free;
}
/* (4) Set the driver ID and name strings */
snd_cobalt_card_set_names(cobsc);
ret = snd_cobalt_pcm_create(cobsc);
if (ret) {
cobalt_err("snd_cobalt_pcm_create() failed with err %d\n",
ret);
goto err_exit_free;
}
/* FIXME - proc files */
/* (7) Set the driver data and return 0 */
/* We do this out of normal order for PCI drivers to avoid races */
s->alsa = cobsc;
/* (6) Register the card instance */
ret = snd_card_register(sc);
if (ret) {
s->alsa = NULL;
cobalt_err("snd_card_register() failed with err %d\n", ret);
goto err_exit_free;
}
return 0;
err_exit_free:
if (sc != NULL)
snd_card_free(sc);
kfree(cobsc);
err_exit:
return ret;
}
void cobalt_alsa_exit(struct cobalt_stream *s)
{
struct snd_cobalt_card *cobsc = s->alsa;
if (cobsc)
snd_card_free(cobsc->sc);
s->alsa = NULL;
}
|
