linux-kernel - [PATCH 2/2] sound: usb: Calling vendor's call-back function within usb audio operation.

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Date:   Mon,  7 Mar 2022 11:22:00 +0900
From:   Oh Eomji <eomji.oh@...sung.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org (open list),
        alsa-devel@...a-project.org, Leon Romanovsky <leon@...nel.org>,
        Pavel Skripkin <paskripkin@...il.com>,
        Oh Eomji <eomji.oh@...sung.com>
Subject: [PATCH 2/2] sound: usb: Calling vendor's call-back function within
 usb audio operation.

When a new interface is connected or removed, the call-back functions
are called to transmit a command to the hardware.

Signed-off-by: Oh Eomji <eomji.oh@...sung.com>
---
 sound/usb/pcm.c    | 40 ++++++++++++++++++++++++++++++++++++++++
 sound/usb/stream.c |  2 ++
 2 files changed, 42 insertions(+)

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index cec6e91a..92e5e82 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -144,6 +144,8 @@ find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
 			found = fp;
 			cur_attr = attr;
 		}
+
+		snd_vendor_set_pcm_binterval(fp, found, &cur_attr, &attr);
 	}
 	return found;
 }
@@ -434,6 +436,7 @@ static int configure_endpoints(struct snd_usb_audio *chip,
 			       struct snd_usb_substream *subs)
 {
 	int err;
+	struct usb_interface *iface;
 
 	if (subs->data_endpoint->need_setup) {
 		/* stop any running stream beforehand */
@@ -442,6 +445,13 @@ static int configure_endpoints(struct snd_usb_audio *chip,
 		err = snd_usb_endpoint_configure(chip, subs->data_endpoint);
 		if (err < 0)
 			return err;
+
+		iface = usb_ifnum_to_if(chip->dev, subs->data_endpoint->iface);
+		err = snd_vendor_set_pcm_intf(iface, subs->data_endpoint->iface,
+				subs->data_endpoint->altsetting, subs->direction);
+		if (err < 0)
+			return err;
+
 		snd_usb_set_format_quirk(subs, subs->cur_audiofmt);
 	}
 
@@ -616,8 +626,19 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_usb_substream *subs = runtime->private_data;
 	struct snd_usb_audio *chip = subs->stream->chip;
+	struct snd_usb_endpoint *ep = subs->data_endpoint;
+	struct usb_interface *iface;
 	int ret;
 
+	ret = snd_vendor_set_pcm_buf(subs->dev, subs->cur_audiofmt->iface);
+	if (ret)
+		return ret;
+
+	if (!subs->cur_audiofmt) {
+		dev_err(&subs->dev->dev, "no format is specified\n");
+		return -ENXIO;
+	}
+
 	ret = snd_usb_lock_shutdown(chip);
 	if (ret < 0)
 		return ret;
@@ -630,6 +651,15 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
 	if (ret < 0)
 		goto unlock;
 
+	iface = usb_ifnum_to_if(chip->dev, ep->cur_audiofmt->iface);
+
+	if (snd_vendor_get_ops()) {
+		ret = snd_vendor_set_rate(iface, ep->cur_audiofmt->iface,
+					ep->cur_rate, ep->cur_audiofmt->altsetting);
+		if (!ret)
+			goto unlock;
+	}
+
 	/* reset the pointer */
 	subs->buffer_bytes = frames_to_bytes(runtime, runtime->buffer_size);
 	subs->inflight_bytes = 0;
@@ -1104,6 +1134,11 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
 	struct snd_usb_substream *subs = &as->substream[direction];
 	int ret;
 
+	ret = snd_vendor_set_pcm_connection(subs->dev, SOUND_PCM_OPEN,
+					    direction);
+	if (ret)
+		return ret;
+
 	runtime->hw = snd_usb_hardware;
 	/* need an explicit sync to catch applptr update in low-latency mode */
 	if (direction == SNDRV_PCM_STREAM_PLAYBACK &&
@@ -1137,6 +1172,11 @@ static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
 	struct snd_usb_substream *subs = &as->substream[direction];
 	int ret;
 
+	ret = snd_vendor_set_pcm_connection(subs->dev, SOUND_PCM_CLOSE,
+					    direction);
+	if (ret)
+		return ret;
+
 	snd_media_stop_pipeline(subs);
 
 	if (!snd_usb_lock_shutdown(subs->stream->chip)) {
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index ceb93d7..26ca696 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -1227,6 +1227,8 @@ static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
 		snd_usb_init_pitch(chip, fp);
 		snd_usb_init_sample_rate(chip, fp, fp->rate_max);
 		usb_set_interface(chip->dev, iface_no, altno);
+		if (protocol > UAC_VERSION_1)
+			snd_vendor_set_interface(chip->dev, alts, iface_no, 0);
 	}
 	return 0;
 }
-- 
2.7.4