Hello,
on my custom board I have a PXA27x CPU and 2 codecs: one connected as primary codec and one connected as secondary codec.
I modify the SoC support in order to allow defining two audio cards, one to manage the first codec and one to manage the second one.
Here the SoC schema:
static struct snd_soc_dai_link bt270p_dai[] = { { .name = "AC97 HiFi", .stream_name = "audio out", .cpu_dai = &pxa_ac97_dai[PXA2XX_DAI_AC97_HIFI], .codec_dai = &cs4299_dai[CS4299_DAI_AC97_HIFI], .init = bt270_ac97_init, .ops = &bt270_ops, }, { .name = "AC97 Aux", .stream_name = "AC97 Aux", .cpu_dai = &pxa_ac97_dai[PXA2XX_DAI_AC97_AUX], .codec_dai = &cs4299_dai[CS4299_DAI_AC97_AUX], .init = bt270_ac97_init, .ops = &bt270_ops, }, };
static struct snd_soc_dai_link bt270s_dai[] = { { .name = "AC97 HiFi", .stream_name = "speakers", .cpu_dai = &pxa_ac97_dai[PXA2XX_DAI_AC97_HIFI], .codec_dai = &cs4299_dai[CS4299_DAI_AC97_HIFI], .init = bt270_ac97_init, .ops = &bt270_ops, }, };
static struct snd_soc_card bt270_asoc[] = { { .name = "BT270 primary", .platform = &pxa2xx_soc_platform, .dai_link = bt270p_dai, .num_links = ARRAY_SIZE(bt270p_dai), }, { .name = "BT270 secondary", .platform = &pxa2xx_soc_platform, .dai_link = bt270s_dai, .num_links = ARRAY_SIZE(bt270s_dai), }, };
static struct cs4299_data cs4299_data[] = { { .ac97_line = 0, }, { .ac97_line = 1, }, };
static struct snd_soc_device bt270_snd_devdata[2] = { { .card = &bt270_asoc[0], .codec_dev = &soc_codec_dev_cs4299, .codec_data = &cs4299_data[0], }, { .card = &bt270_asoc[1], .codec_dev = &soc_codec_dev_cs4299, .codec_data = &cs4299_data[1], }, };
static struct platform_device *bt270_snd_device[2];
I'm using the ac97_line parameters into codec's code in order to select the primary and the second codecs as follow:
static int cs4299_soc_probe(struct platform_device *pdev) { struct snd_soc_device *socdev = platform_get_drvdata(pdev); struct cs4299_data *data = (struct cs4299_data *) socdev->codec_data; struct snd_soc_codec *codec; int ac97_line; int ret = 0;
printk(KERN_INFO "CS4299 SoC Audio Codec %s\n", CS4299_VERSION);
/* Check specific codec data or set default if not defined */ ac97_line = 0; if (data) ac97_line = data->ac97_line;
socdev->card->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL); if (socdev->card->codec == NULL) return -ENOMEM; codec = socdev->card->codec; mutex_init(&codec->mutex);
codec->reg_cache = kmemdup(cs4299_reg, sizeof(cs4299_reg), GFP_KERNEL);
if (codec->reg_cache == NULL) { ret = -ENOMEM; goto cache_err; } codec->reg_cache_size = sizeof(cs4299_reg); codec->reg_cache_step = 2;
codec->name = "CS4299"; codec->id = ac97_line; codec->owner = THIS_MODULE; codec->dai = cs4299_dai; codec->num_dai = ARRAY_SIZE(cs4299_dai); codec->write = ac97_write; codec->read = ac97_read; INIT_LIST_HEAD(&codec->dapm_widgets); INIT_LIST_HEAD(&codec->dapm_paths);
ret = snd_soc_new_ac97_codec(codec, &soc_ac97_ops, ac97_line); if (ret < 0) { printk(KERN_ERR "cs4299: failed to register AC97 codec\n"); goto codec_err; }
/* register pcms */ ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1); if (ret < 0) goto pcm_err;
ret = cs4299_reset(codec, 0); if (ret < 0) { printk(KERN_ERR "Failed to reset CS4299: AC97 link error\n"); goto reset_err; }
snd_soc_add_controls(codec, cs4299_snd_ac97_controls, ARRAY_SIZE(cs4299_snd_ac97_controls)); cs4299_add_widgets(codec); ret = snd_soc_init_card(socdev); if (ret < 0) { printk(KERN_ERR "cs4299: failed to register card\n"); goto reset_err; }
return 0;
Everything is working ok but the PCM play/record. In fact I can manage both codecs' registers by using:
alsamixer -c 0 and alsamixer -c 1
but when I try to play an MP3 file I can hear the music only on the second codec no matter which audio card I select for playing.
I tested the hardware by defining just one codec at time, and doing in this manner the music goes to the right codec.
Any suggeston? :)
Thanks in advance,
Rodolfo