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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ALSA interface to cx18 PCM capture streams
*
* Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net>
* Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
*
* Portions of this work were sponsored by ONELAN Limited.
*/
#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 "cx18-driver.h"
#include "cx18-version.h"
#include "cx18-alsa.h"
#include "cx18-alsa-pcm.h"
int cx18_alsa_debug;
#define CX18_DEBUG_ALSA_INFO(fmt, arg...) \
do { \
if (cx18_alsa_debug & 2) \
printk(KERN_INFO "%s: " fmt, "cx18-alsa", ## arg); \
} while (0);
module_param_named(debug, cx18_alsa_debug, int, 0644);
MODULE_PARM_DESC(debug,
"Debug level (bitmask). Default: 0\n"
"\t\t\t 1/0x0001: warning\n"
"\t\t\t 2/0x0002: info\n");
MODULE_AUTHOR("Andy Walls");
MODULE_DESCRIPTION("CX23418 ALSA Interface");
MODULE_LICENSE("GPL");
MODULE_VERSION(CX18_VERSION);
static inline
struct snd_cx18_card *to_snd_cx18_card(struct v4l2_device *v4l2_dev)
{
return to_cx18(v4l2_dev)->alsa;
}
static inline
struct snd_cx18_card *p_to_snd_cx18_card(struct v4l2_device **v4l2_dev)
{
return container_of(v4l2_dev, struct snd_cx18_card, v4l2_dev);
}
static void snd_cx18_card_free(struct snd_cx18_card *cxsc)
{
if (cxsc == NULL)
return;
if (cxsc->v4l2_dev != NULL)
to_cx18(cxsc->v4l2_dev)->alsa = NULL;
/* FIXME - take any other stopping actions needed */
kfree(cxsc);
}
static void snd_cx18_card_private_free(struct snd_card *sc)
{
if (sc == NULL)
return;
snd_cx18_card_free(sc->private_data);
sc->private_data = NULL;
sc->private_free = NULL;
}
static int snd_cx18_card_create(struct v4l2_device *v4l2_dev,
struct snd_card *sc,
struct snd_cx18_card **cxsc)
{
*cxsc = kzalloc(sizeof(struct snd_cx18_card), GFP_KERNEL);
if (*cxsc == NULL)
return -ENOMEM;
(*cxsc)->v4l2_dev = v4l2_dev;
(*cxsc)->sc = sc;
sc->private_data = *cxsc;
sc->private_free = snd_cx18_card_private_free;
return 0;
}
static int snd_cx18_card_set_names(struct snd_cx18_card *cxsc)
{
struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
struct snd_card *sc = cxsc->sc;
/* sc->driver is used by alsa-lib's configurator: simple, unique */
strscpy(sc->driver, "CX23418", sizeof(sc->driver));
/* sc->shortname is a symlink in /proc/asound: CX18-M -> cardN */
snprintf(sc->shortname, sizeof(sc->shortname), "CX18-%d",
cx->instance);
/* sc->longname is read from /proc/asound/cards */
snprintf(sc->longname, sizeof(sc->longname),
"CX23418 #%d %s TV/FM Radio/Line-In Capture",
cx->instance, cx->card_name);
return 0;
}
static int snd_cx18_init(struct v4l2_device *v4l2_dev)
{
struct cx18 *cx = to_cx18(v4l2_dev);
struct snd_card *sc = NULL;
struct snd_cx18_card *cxsc;
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 cx->instance */
/* (2) Create a card instance */
ret = snd_card_new(&cx->pci_dev->dev,
SNDRV_DEFAULT_IDX1, /* use first available id */
SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
THIS_MODULE, 0, &sc);
if (ret) {
CX18_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
__func__, ret);
goto err_exit;
}
/* (3) Create a main component */
ret = snd_cx18_card_create(v4l2_dev, sc, &cxsc);
if (ret) {
CX18_ALSA_ERR("%s: snd_cx18_card_create() failed with err %d\n",
__func__, ret);
goto err_exit_free;
}
/* (4) Set the driver ID and name strings */
snd_cx18_card_set_names(cxsc);
ret = snd_cx18_pcm_create(cxsc);
if (ret) {
CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
__func__, 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 */
cx->alsa = cxsc;
/* (6) Register the card instance */
ret = snd_card_register(sc);
if (ret) {
cx->alsa = NULL;
CX18_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
__func__, ret);
goto err_exit_free;
}
return 0;
err_exit_free:
if (sc != NULL)
snd_card_free(sc);
kfree(cxsc);
err_exit:
return ret;
}
static int cx18_alsa_load(struct cx18 *cx)
{
struct v4l2_device *v4l2_dev = &cx->v4l2_dev;
struct cx18_stream *s;
if (v4l2_dev == NULL) {
printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n",
__func__);
return 0;
}
cx = to_cx18(v4l2_dev);
if (cx == NULL) {
printk(KERN_ERR "cx18-alsa cx is NULL\n");
return 0;
}
s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
if (s->video_dev.v4l2_dev == NULL) {
CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - skipping\n",
__func__);
return 0;
}
if (cx->alsa != NULL) {
CX18_ALSA_ERR("%s: struct snd_cx18_card * already exists\n",
__func__);
return 0;
}
if (snd_cx18_init(v4l2_dev)) {
CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n",
__func__);
} else {
CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance\n",
__func__);
}
return 0;
}
static int __init cx18_alsa_init(void)
{
printk(KERN_INFO "cx18-alsa: module loading...\n");
cx18_ext_init = &cx18_alsa_load;
return 0;
}
static void __exit snd_cx18_exit(struct snd_cx18_card *cxsc)
{
struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
/* FIXME - pointer checks & shutdown cxsc */
snd_card_free(cxsc->sc);
cx->alsa = NULL;
}
static int __exit cx18_alsa_exit_callback(struct device *dev, void *data)
{
struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
struct snd_cx18_card *cxsc;
if (v4l2_dev == NULL) {
printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n",
__func__);
return 0;
}
cxsc = to_snd_cx18_card(v4l2_dev);
if (cxsc == NULL) {
CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n",
__func__);
return 0;
}
snd_cx18_exit(cxsc);
return 0;
}
static void __exit cx18_alsa_exit(void)
{
struct device_driver *drv;
int ret;
printk(KERN_INFO "cx18-alsa: module unloading...\n");
drv = driver_find("cx18", &pci_bus_type);
ret = driver_for_each_device(drv, NULL, NULL, cx18_alsa_exit_callback);
(void)ret; /* suppress compiler warning */
cx18_ext_init = NULL;
printk(KERN_INFO "cx18-alsa: module unload complete\n");
}
module_init(cx18_alsa_init);
module_exit(cx18_alsa_exit);
|
