int __init snd_cx18_mixer_create(struct snd_cx18_card *cxsc)
{
struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
struct snd_card *sc = cxsc->sc;
int ret;
strlcpy(sc->mixername, "CX23418 Mixer", sizeof(sc->mixername));
ret = snd_ctl_add(sc, snd_ctl_new1(snd_cx18_mixer_tv_vol, cxsc));
if (ret) {
CX18_ALSA_WARN("%s: failed to add %s control, err %d\n",
__func__, snd_cx18_mixer_tv_vol.name, ret);
}
return ret;
}
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 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_create(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_create() 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);
#if 0
/* (5) Create other components: mixer, PCM, & proc files */
ret = snd_cx18_mixer_create(cxsc);
if (ret) {
CX18_ALSA_WARN("%s: snd_cx18_mixer_create() failed with err %d:"
"proceeding anyway\n", __func__, ret);
}
#endif
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);
err_exit:
return ret;
}
