ALSA: usb-audio: store protocol version in struct audioformat

Instead of reading bInterfaceProtocol from the descriptor whenever it's
needed, store this value in the audioformat structure.  Besides
simplifying some code, this will allow us to correctly handle vendor-
specific devices where the descriptors are marked with other values.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 10 insertions, 24 deletions

diff --git a/sound/usb/format.c b/sound/usb/format.c
index 99299ff..3525231 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -43,13 +43,12 @@
  */
 static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
 				     struct audioformat *fp,
-				     unsigned int format, void *_fmt,
-				     int protocol)
+				     unsigned int format, void *_fmt)
 {
 	int sample_width, sample_bytes;
 	u64 pcm_formats = 0;
 
-	switch (protocol) {
+	switch (fp->protocol) {
 	case UAC_VERSION_1:
 	default: {
 		struct uac_format_type_i_discrete_descriptor *fmt = _fmt;
@@ -360,11 +359,8 @@ err:
  */
 static int parse_audio_format_i(struct snd_usb_audio *chip,
 				struct audioformat *fp, unsigned int format,
-				struct uac_format_type_i_continuous_descriptor *fmt,
-				struct usb_host_interface *iface)
+				struct uac_format_type_i_continuous_descriptor *fmt)
 {
-	struct usb_interface_descriptor *altsd = get_iface_desc(iface);
-	int protocol = altsd->bInterfaceProtocol;
 	snd_pcm_format_t pcm_format;
 	int ret;
 
@@ -387,8 +383,7 @@ static int parse_audio_format_i(struct snd_usb_audio *chip,
 		}
 		fp->formats = pcm_format_to_bits(pcm_format);
 	} else {
-		fp->formats = parse_audio_format_i_type(chip, fp, format,
-							fmt, protocol);
+		fp->formats = parse_audio_format_i_type(chip, fp, format, fmt);
 		if (!fp->formats)
 			return -EINVAL;
 	}
@@ -398,11 +393,8 @@ static int parse_audio_format_i(struct snd_usb_audio *chip,
 	 * proprietary class specific descriptor.
 	 * audio class v2 uses class specific EP0 range requests for that.
 	 */
-	switch (protocol) {
+	switch (fp->protocol) {
 	default:
-		snd_printdd(KERN_WARNING "%d:%u:%d : invalid protocol version %d, assuming v1\n",
-			   chip->dev->devnum, fp->iface, fp->altsetting, protocol);
-		/* fall through */
 	case UAC_VERSION_1:
 		fp->channels = fmt->bNrChannels;
 		ret = parse_audio_format_rates_v1(chip, fp, (unsigned char *) fmt, 7);
@@ -427,12 +419,9 @@ static int parse_audio_format_i(struct snd_usb_audio *chip,
  */
 static int parse_audio_format_ii(struct snd_usb_audio *chip,
 				 struct audioformat *fp,
-				 int format, void *_fmt,
-				 struct usb_host_interface *iface)
+				 int format, void *_fmt)
 {
 	int brate, framesize, ret;
-	struct usb_interface_descriptor *altsd = get_iface_desc(iface);
-	int protocol = altsd->bInterfaceProtocol;
 
 	switch (format) {
 	case UAC_FORMAT_TYPE_II_AC3:
@@ -452,11 +441,8 @@ static int parse_audio_format_ii(struct snd_usb_audio *chip,
 
 	fp->channels = 1;
 
-	switch (protocol) {
+	switch (fp->protocol) {
 	default:
-		snd_printdd(KERN_WARNING "%d:%u:%d : invalid protocol version %d, assuming v1\n",
-			   chip->dev->devnum, fp->iface, fp->altsetting, protocol);
-		/* fall through */
 	case UAC_VERSION_1: {
 		struct uac_format_type_ii_discrete_descriptor *fmt = _fmt;
 		brate = le16_to_cpu(fmt->wMaxBitRate);
@@ -483,17 +469,17 @@ static int parse_audio_format_ii(struct snd_usb_audio *chip,
 int snd_usb_parse_audio_format(struct snd_usb_audio *chip,
 			       struct audioformat *fp, unsigned int format,
 			       struct uac_format_type_i_continuous_descriptor *fmt,
-			       int stream, struct usb_host_interface *iface)
+			       int stream)
 {
 	int err;
 
 	switch (fmt->bFormatType) {
 	case UAC_FORMAT_TYPE_I:
 	case UAC_FORMAT_TYPE_III:
-		err = parse_audio_format_i(chip, fp, format, fmt, iface);
+		err = parse_audio_format_i(chip, fp, format, fmt);
 		break;
 	case UAC_FORMAT_TYPE_II:
-		err = parse_audio_format_ii(chip, fp, format, fmt, iface);
+		err = parse_audio_format_ii(chip, fp, format, fmt);
 		break;
 	default:
 		snd_printd(KERN_INFO "%d:%u:%d : format type %d is not supported yet\n",