2 * ALSA interface to ivtv PCM capture streams
4 * Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net>
5 * Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
7 * Portions of this work were sponsored by ONELAN Limited for the cx18 driver
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/slab.h>
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/device.h>
30 #include <linux/spinlock.h>
32 #include <media/v4l2-device.h>
34 #include <sound/core.h>
35 #include <sound/initval.h>
37 #include "ivtv-driver.h"
38 #include "ivtv-version.h"
39 #include "ivtv-alsa.h"
40 #include "ivtv-alsa-mixer.h"
41 #include "ivtv-alsa-pcm.h"
45 #define IVTV_DEBUG_ALSA_INFO(fmt, arg...) \
47 if (ivtv_alsa_debug & 2) \
48 pr_info("%s: " fmt, "ivtv-alsa", ## arg); \
51 module_param_named(debug, ivtv_alsa_debug, int, 0644);
52 MODULE_PARM_DESC(debug,
53 "Debug level (bitmask). Default: 0\n"
54 "\t\t\t 1/0x0001: warning\n"
55 "\t\t\t 2/0x0002: info\n");
57 MODULE_AUTHOR("Andy Walls");
58 MODULE_DESCRIPTION("CX23415/CX23416 ALSA Interface");
59 MODULE_SUPPORTED_DEVICE("CX23415/CX23416 MPEG2 encoder");
60 MODULE_LICENSE("GPL");
62 MODULE_VERSION(IVTV_VERSION);
65 struct snd_ivtv_card *to_snd_ivtv_card(struct v4l2_device *v4l2_dev)
67 return to_ivtv(v4l2_dev)->alsa;
71 struct snd_ivtv_card *p_to_snd_ivtv_card(struct v4l2_device **v4l2_dev)
73 return container_of(v4l2_dev, struct snd_ivtv_card, v4l2_dev);
76 static void snd_ivtv_card_free(struct snd_ivtv_card *itvsc)
81 if (itvsc->v4l2_dev != NULL)
82 to_ivtv(itvsc->v4l2_dev)->alsa = NULL;
84 /* FIXME - take any other stopping actions needed */
89 static void snd_ivtv_card_private_free(struct snd_card *sc)
93 snd_ivtv_card_free(sc->private_data);
94 sc->private_data = NULL;
95 sc->private_free = NULL;
98 static int snd_ivtv_card_create(struct v4l2_device *v4l2_dev,
100 struct snd_ivtv_card **itvsc)
102 *itvsc = kzalloc(sizeof(struct snd_ivtv_card), GFP_KERNEL);
106 (*itvsc)->v4l2_dev = v4l2_dev;
109 sc->private_data = *itvsc;
110 sc->private_free = snd_ivtv_card_private_free;
115 static int snd_ivtv_card_set_names(struct snd_ivtv_card *itvsc)
117 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
118 struct snd_card *sc = itvsc->sc;
120 /* sc->driver is used by alsa-lib's configurator: simple, unique */
121 strlcpy(sc->driver, "CX2341[56]", sizeof(sc->driver));
123 /* sc->shortname is a symlink in /proc/asound: IVTV-M -> cardN */
124 snprintf(sc->shortname, sizeof(sc->shortname), "IVTV-%d",
127 /* sc->longname is read from /proc/asound/cards */
128 snprintf(sc->longname, sizeof(sc->longname),
129 "CX2341[56] #%d %s TV/FM Radio/Line-In Capture",
130 itv->instance, itv->card_name);
135 static int snd_ivtv_init(struct v4l2_device *v4l2_dev)
137 struct ivtv *itv = to_ivtv(v4l2_dev);
138 struct snd_card *sc = NULL;
139 struct snd_ivtv_card *itvsc;
142 /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
144 /* (1) Check and increment the device index */
145 /* This is a no-op for us. We'll use the itv->instance */
147 /* (2) Create a card instance */
148 ret = snd_card_new(&itv->pdev->dev,
149 SNDRV_DEFAULT_IDX1, /* use first available id */
150 SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
151 THIS_MODULE, 0, &sc);
153 IVTV_ALSA_ERR("%s: snd_card_new() failed with err %d\n",
158 /* (3) Create a main component */
159 ret = snd_ivtv_card_create(v4l2_dev, sc, &itvsc);
161 IVTV_ALSA_ERR("%s: snd_ivtv_card_create() failed with err %d\n",
166 /* (4) Set the driver ID and name strings */
167 snd_ivtv_card_set_names(itvsc);
169 /* (5) Create other components: mixer, PCM, & proc files */
171 ret = snd_ivtv_mixer_create(itvsc);
173 IVTV_ALSA_WARN("%s: snd_ivtv_mixer_create() failed with err %d:"
174 " proceeding anyway\n", __func__, ret);
178 ret = snd_ivtv_pcm_create(itvsc);
180 IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
184 /* FIXME - proc files */
186 /* (7) Set the driver data and return 0 */
187 /* We do this out of normal order for PCI drivers to avoid races */
190 /* (6) Register the card instance */
191 ret = snd_card_register(sc);
194 IVTV_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
209 static int ivtv_alsa_load(struct ivtv *itv)
211 struct v4l2_device *v4l2_dev = &itv->v4l2_dev;
212 struct ivtv_stream *s;
214 if (v4l2_dev == NULL) {
215 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
220 itv = to_ivtv(v4l2_dev);
222 pr_err("ivtv-alsa itv is NULL\n");
226 s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
227 if (s->vdev.v4l2_dev == NULL) {
228 IVTV_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - "
229 "skipping\n", __func__);
233 if (itv->alsa != NULL) {
234 IVTV_ALSA_ERR("%s: struct snd_ivtv_card * already exists\n",
239 if (snd_ivtv_init(v4l2_dev)) {
240 IVTV_ALSA_ERR("%s: failed to create struct snd_ivtv_card\n",
243 IVTV_DEBUG_ALSA_INFO("%s: created ivtv ALSA interface instance "
249 static int __init ivtv_alsa_init(void)
251 pr_info("ivtv-alsa: module loading...\n");
252 ivtv_ext_init = &ivtv_alsa_load;
256 static void __exit snd_ivtv_exit(struct snd_ivtv_card *itvsc)
258 struct ivtv *itv = to_ivtv(itvsc->v4l2_dev);
260 /* FIXME - pointer checks & shutdown itvsc */
262 snd_card_free(itvsc->sc);
266 static int __exit ivtv_alsa_exit_callback(struct device *dev, void *data)
268 struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
269 struct snd_ivtv_card *itvsc;
271 if (v4l2_dev == NULL) {
272 pr_err("ivtv-alsa: %s: struct v4l2_device * is NULL\n",
277 itvsc = to_snd_ivtv_card(v4l2_dev);
279 IVTV_ALSA_WARN("%s: struct snd_ivtv_card * is NULL\n",
284 snd_ivtv_exit(itvsc);
288 static void __exit ivtv_alsa_exit(void)
290 struct device_driver *drv;
293 pr_info("ivtv-alsa: module unloading...\n");
295 drv = driver_find("ivtv", &pci_bus_type);
296 ret = driver_for_each_device(drv, NULL, NULL, ivtv_alsa_exit_callback);
297 (void)ret; /* suppress compiler warning */
299 ivtv_ext_init = NULL;
300 pr_info("ivtv-alsa: module unload complete\n");
303 module_init(ivtv_alsa_init);
304 module_exit(ivtv_alsa_exit);