2 * ALSA interface to cx18 PCM capture streams
4 * Copyright (C) 2009 Andy Walls <awalls@radix.net>
5 * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
7 * Portions of this work were sponsored by ONELAN Limited.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
25 #include <linux/init.h>
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/device.h>
29 #include <linux/spinlock.h>
31 #include <media/v4l2-device.h>
33 #include <sound/core.h>
34 #include <sound/initval.h>
36 #include "cx18-driver.h"
37 #include "cx18-version.h"
38 #include "cx18-alsa.h"
39 #include "cx18-alsa-mixer.h"
40 #include "cx18-alsa-pcm.h"
44 #define CX18_DEBUG_ALSA_INFO(fmt, arg...) \
46 if (cx18_alsa_debug & 2) \
47 printk(KERN_INFO "%s: " fmt, "cx18-alsa", ## arg); \
50 module_param_named(debug
, cx18_alsa_debug
, int, 0644);
51 MODULE_PARM_DESC(debug
,
52 "Debug level (bitmask). Default: 0\n"
53 "\t\t\t 1/0x0001: warning\n"
54 "\t\t\t 2/0x0002: info\n");
56 MODULE_AUTHOR("Andy Walls");
57 MODULE_DESCRIPTION("CX23418 ALSA Interface");
58 MODULE_SUPPORTED_DEVICE("CX23418 MPEG2 encoder");
59 MODULE_LICENSE("GPL");
61 MODULE_VERSION(CX18_VERSION
);
64 struct snd_cx18_card
*to_snd_cx18_card(struct v4l2_device
*v4l2_dev
)
66 return to_cx18(v4l2_dev
)->alsa
;
70 struct snd_cx18_card
*p_to_snd_cx18_card(struct v4l2_device
**v4l2_dev
)
72 return container_of(v4l2_dev
, struct snd_cx18_card
, v4l2_dev
);
75 static void snd_cx18_card_free(struct snd_cx18_card
*cxsc
)
80 if (cxsc
->v4l2_dev
!= NULL
)
81 to_cx18(cxsc
->v4l2_dev
)->alsa
= NULL
;
83 /* FIXME - take any other stopping actions needed */
88 static void snd_cx18_card_private_free(struct snd_card
*sc
)
92 snd_cx18_card_free(sc
->private_data
);
93 sc
->private_data
= NULL
;
94 sc
->private_free
= NULL
;
97 static int snd_cx18_card_create(struct v4l2_device
*v4l2_dev
,
99 struct snd_cx18_card
**cxsc
)
101 *cxsc
= kzalloc(sizeof(struct snd_cx18_card
), GFP_KERNEL
);
105 (*cxsc
)->v4l2_dev
= v4l2_dev
;
108 sc
->private_data
= *cxsc
;
109 sc
->private_free
= snd_cx18_card_private_free
;
114 static int snd_cx18_card_set_names(struct snd_cx18_card
*cxsc
)
116 struct cx18
*cx
= to_cx18(cxsc
->v4l2_dev
);
117 struct snd_card
*sc
= cxsc
->sc
;
119 /* sc->driver is used by alsa-lib's configurator: simple, unique */
120 strlcpy(sc
->driver
, "CX23418", sizeof(sc
->driver
));
122 /* sc->shortname is a symlink in /proc/asound: CX18-M -> cardN */
123 snprintf(sc
->shortname
, sizeof(sc
->shortname
), "CX18-%d",
126 /* sc->longname is read from /proc/asound/cards */
127 snprintf(sc
->longname
, sizeof(sc
->longname
),
128 "CX23418 #%d %s TV/FM Radio/Line-In Capture",
129 cx
->instance
, cx
->card_name
);
134 static int snd_cx18_init(struct v4l2_device
*v4l2_dev
)
136 struct cx18
*cx
= to_cx18(v4l2_dev
);
137 struct snd_card
*sc
= NULL
;
138 struct snd_cx18_card
*cxsc
;
141 /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
143 /* (1) Check and increment the device index */
144 /* This is a no-op for us. We'll use the cx->instance */
146 /* (2) Create a card instance */
147 ret
= snd_card_create(SNDRV_DEFAULT_IDX1
, /* use first available id */
148 SNDRV_DEFAULT_STR1
, /* xid from end of shortname*/
149 THIS_MODULE
, 0, &sc
);
151 CX18_ALSA_ERR("%s: snd_card_create() failed with err %d\n",
156 /* (3) Create a main component */
157 ret
= snd_cx18_card_create(v4l2_dev
, sc
, &cxsc
);
159 CX18_ALSA_ERR("%s: snd_cx18_card_create() failed with err %d\n",
164 /* (4) Set the driver ID and name strings */
165 snd_cx18_card_set_names(cxsc
);
168 ret
= snd_cx18_pcm_create(cxsc
);
170 CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
174 /* FIXME - proc files */
176 /* (7) Set the driver data and return 0 */
177 /* We do this out of normal order for PCI drivers to avoid races */
180 /* (6) Register the card instance */
181 ret
= snd_card_register(sc
);
184 CX18_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
198 int cx18_alsa_load(struct cx18
*cx
)
200 struct v4l2_device
*v4l2_dev
= &cx
->v4l2_dev
;
201 struct cx18_stream
*s
;
203 if (v4l2_dev
== NULL
) {
204 printk(KERN_ERR
"cx18-alsa: %s: struct v4l2_device * is NULL\n",
209 cx
= to_cx18(v4l2_dev
);
211 printk(KERN_ERR
"cx18-alsa cx is NULL\n");
215 s
= &cx
->streams
[CX18_ENC_STREAM_TYPE_PCM
];
216 if (s
->video_dev
== NULL
) {
217 CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - "
218 "skipping\n", __func__
);
222 if (cx
->alsa
!= NULL
) {
223 CX18_ALSA_ERR("%s: struct snd_cx18_card * already exists\n",
228 if (snd_cx18_init(v4l2_dev
)) {
229 CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n",
232 CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance "
238 static int __init
cx18_alsa_init(void)
240 printk(KERN_INFO
"cx18-alsa: module loading...\n");
241 cx18_ext_init
= &cx18_alsa_load
;
245 static void __exit
snd_cx18_exit(struct snd_cx18_card
*cxsc
)
247 struct cx18
*cx
= to_cx18(cxsc
->v4l2_dev
);
249 /* FIXME - pointer checks & shutdown cxsc */
251 snd_card_free(cxsc
->sc
);
255 static int __exit
cx18_alsa_exit_callback(struct device
*dev
, void *data
)
257 struct v4l2_device
*v4l2_dev
= dev_get_drvdata(dev
);
258 struct snd_cx18_card
*cxsc
;
260 if (v4l2_dev
== NULL
) {
261 printk(KERN_ERR
"cx18-alsa: %s: struct v4l2_device * is NULL\n",
266 cxsc
= to_snd_cx18_card(v4l2_dev
);
268 CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n",
277 static void __exit
cx18_alsa_exit(void)
279 struct device_driver
*drv
;
282 printk(KERN_INFO
"cx18-alsa: module unloading...\n");
284 drv
= driver_find("cx18", &pci_bus_type
);
285 ret
= driver_for_each_device(drv
, NULL
, NULL
, cx18_alsa_exit_callback
);
288 cx18_ext_init
= NULL
;
289 printk(KERN_INFO
"cx18-alsa: module unload complete\n");
292 module_init(cx18_alsa_init
);
293 module_exit(cx18_alsa_exit
);