sound/soc/qcom/qdsp6/q6usb.c

Source file repositories/reference/linux-study-clean/sound/soc/qcom/qdsp6/q6usb.c

File Facts

System
Linux kernel
Corpus path
sound/soc/qcom/qdsp6/q6usb.c
Extension
.c
Size
10558 bytes
Lines
423
Domain
Driver Families
Bucket
sound/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct q6usb_port_data {
	struct auxiliary_device uauxdev;
	struct q6afe_usb_cfg usb_cfg;
	struct snd_soc_usb *usb;
	struct snd_soc_jack *hs_jack;
	struct q6usb_offload priv;

	/* Protects against operations between SOC USB and ASoC */
	struct mutex mutex;
	struct list_head devices;
};

static const struct snd_soc_dapm_widget q6usb_dai_widgets[] = {
	SND_SOC_DAPM_HP("USB_RX_BE", NULL),
};

static const struct snd_soc_dapm_route q6usb_dapm_routes[] = {
	{"USB Playback", NULL, "USB_RX_BE"},
};

static int q6usb_hw_params(struct snd_pcm_substream *substream,
			   struct snd_pcm_hw_params *params,
			   struct snd_soc_dai *dai)
{
	struct q6usb_port_data *data = dev_get_drvdata(dai->dev);
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
	int direction = substream->stream;
	struct q6afe_port *q6usb_afe;
	struct snd_soc_usb_device *sdev;
	int ret = -EINVAL;

	mutex_lock(&data->mutex);

	/* No active chip index */
	if (list_empty(&data->devices))
		goto out;

	sdev = list_last_entry(&data->devices, struct snd_soc_usb_device, list);

	ret = snd_soc_usb_find_supported_format(sdev->chip_idx, params, direction);
	if (ret < 0)
		goto out;

	q6usb_afe = q6afe_port_get_from_id(cpu_dai->dev, USB_RX);
	if (IS_ERR(q6usb_afe)) {
		ret = PTR_ERR(q6usb_afe);
		goto out;
	}

	/* Notify audio DSP about the devices being offloaded */
	ret = afe_port_send_usb_dev_param(q6usb_afe, sdev->card_idx,
					  sdev->ppcm_idx[sdev->num_playback - 1]);

out:
	mutex_unlock(&data->mutex);

	return ret;
}

static const struct snd_soc_dai_ops q6usb_ops = {
	.hw_params = q6usb_hw_params,
};

static struct snd_soc_dai_driver q6usb_be_dais[] = {
	{
		.playback = {
			.stream_name = "USB BE RX",
			.rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |
				SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 |
				SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |
				SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_96000 |
				SNDRV_PCM_RATE_192000,
			.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
				SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_U16_BE |
				SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S24_BE |
				SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_U24_BE,
			.channels_min = 1,
			.channels_max = 2,
			.rate_max =     192000,
			.rate_min =	8000,
		},
		.id = USB_RX,
		.name = "USB_RX_BE",
		.ops = &q6usb_ops,
	},
};

static int q6usb_audio_ports_of_xlate_dai_name(struct snd_soc_component *component,
					       const struct of_phandle_args *args,

Annotation

Implementation Notes