[PATCH 1/7] ALSA: usb-audio: store protocol version in struct audioformat

[Clemens Ladisch <clemens@ladisch.de>]

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>
---
 sound/usb/card.h   |  1 +
 sound/usb/clock.c  |  4 +---
 sound/usb/format.c | 34 ++++++++++------------------------
 sound/usb/format.h |  2 +-
 sound/usb/pcm.c    |  4 +---
 sound/usb/stream.c |  3 ++-
 6 files changed, 16 insertions(+), 32 deletions(-)

diff --git a/sound/usb/card.h b/sound/usb/card.h
index bf2889a..5ecacaa 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -21,6 +21,7 @@ struct audioformat {
 	unsigned char endpoint;		/* endpoint */
 	unsigned char ep_attr;		/* endpoint attributes */
 	unsigned char datainterval;	/* log_2 of data packet interval */
+	unsigned char protocol;		/* UAC_VERSION_1/2 */
 	unsigned int maxpacksize;	/* max. packet size */
 	unsigned int rates;		/* rate bitmasks */
 	unsigned int rate_min, rate_max;	/* min/max rates */
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 3a2ce39..86f80c6 100644
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -407,9 +407,7 @@ int snd_usb_init_sample_rate(struct snd_usb_audio *chip, int iface,
 			     struct usb_host_interface *alts,
 			     struct audioformat *fmt, int rate)
 {
-	struct usb_interface_descriptor *altsd = get_iface_desc(alts);
-
-	switch (altsd->bInterfaceProtocol) {
+	switch (fmt->protocol) {
 	case UAC_VERSION_1:
 	default:
 		return set_sample_rate_v1(chip, iface, alts, fmt, rate);
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",
diff --git a/sound/usb/format.h b/sound/usb/format.h
index 6f31522..4b8a011 100644
--- a/sound/usb/format.h
+++ b/sound/usb/format.h
@@ -4,6 +4,6 @@
 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);

 #endif /*  __USBAUDIO_FORMAT_H */
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 93b6e32..776c58c 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -202,13 +202,11 @@ int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
 		       struct usb_host_interface *alts,
 		       struct audioformat *fmt)
 {
-	struct usb_interface_descriptor *altsd = get_iface_desc(alts);
-
 	/* if endpoint doesn't have pitch control, bail out */
 	if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
 		return 0;

-	switch (altsd->bInterfaceProtocol) {
+	switch (fmt->protocol) {
 	case UAC_VERSION_1:
 	default:
 		return init_pitch_v1(chip, iface, alts, fmt);
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 60d0ff1..df43844 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -635,6 +635,7 @@ int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
 		fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
 		fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
 		fp->datainterval = snd_usb_parse_datainterval(chip, alts);
+		fp->protocol = protocol;
 		fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
 		fp->channels = num_channels;
 		if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
@@ -676,7 +677,7 @@ int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
 		}

 		/* ok, let's parse further... */
-		if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) {
+		if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream) < 0) {
 			kfree(fp->rate_table);
 			kfree(fp->chmap);
 			kfree(fp);