Re: [PATCH v2 7/9] ALSA: virtio: introduce jack support

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On Sun, 24 Jan 2021, Anton Yakovlev wrote:

Enumerate all available jacks and create ALSA controls.

At the moment jacks have a simple implementation and can only be used
to receive notifications about a plugged in/out device.

Signed-off-by: Anton Yakovlev <anton.yakovlev@xxxxxxxxxxxxxxx>
---
sound/virtio/Makefile      |   1 +
sound/virtio/virtio_card.c |  18 +++
sound/virtio/virtio_card.h |  12 ++
sound/virtio/virtio_jack.c | 255 +++++++++++++++++++++++++++++++++++++
4 files changed, 286 insertions(+)
create mode 100644 sound/virtio/virtio_jack.c

[snip]

diff --git a/sound/virtio/virtio_jack.c b/sound/virtio/virtio_jack.c
new file mode 100644
index 000000000000..83593c59f6bf
--- /dev/null
+++ b/sound/virtio/virtio_jack.c
@@ -0,0 +1,255 @@

[snip]

+/**
+ * virtsnd_jack_parse_cfg() - Parse the jack configuration.
+ * @snd: VirtIO sound device.
+ *
+ * This function is called during initial device initialization.
+ *
+ * Context: Any context that permits to sleep.
+ * Return: 0 on success, -errno on failure.
+ */
+int virtsnd_jack_parse_cfg(struct virtio_snd *snd)
+{
+	struct virtio_device *vdev = snd->vdev;
+	struct virtio_snd_jack_info *info;
+	unsigned int i;
+	int rc;
+
+	virtio_cread(vdev, struct virtio_snd_config, jacks, &snd->njacks);
+	if (!snd->njacks)
+		return 0;
+
+	snd->jacks = devm_kcalloc(&vdev->dev, snd->njacks, sizeof(*snd->jacks),
+				  GFP_KERNEL);
+	if (!snd->jacks)
+		return -ENOMEM;
+
+	info = devm_kcalloc(&vdev->dev, snd->njacks, sizeof(*info), GFP_KERNEL);

just kcalloc()

+	if (!info)
+		return -ENOMEM;
+
+	rc = virtsnd_ctl_query_info(snd, VIRTIO_SND_R_JACK_INFO, 0, snd->njacks,
+				    sizeof(*info), info);
+	if (rc)
+		return rc;
+
+	for (i = 0; i < snd->njacks; ++i) {
+		struct virtio_jack *jack = &snd->jacks[i];
+		struct virtio_pcm *pcm;
+
+		jack->nid = le32_to_cpu(info[i].hdr.hda_fn_nid);
+		jack->features = le32_to_cpu(info[i].features);
+		jack->defconf = le32_to_cpu(info[i].hda_reg_defconf);
+		jack->caps = le32_to_cpu(info[i].hda_reg_caps);
+		jack->connected = info[i].connected;
+
+		pcm = virtsnd_pcm_find_or_create(snd, jack->nid);
+		if (IS_ERR(pcm))
+			return PTR_ERR(pcm);
+	}
+
+	devm_kfree(&vdev->dev, info);
+
+	return 0;
+}

Thanks
Guennadi
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