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ALSA: usb-audio: store protocol version in struct audioformat
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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>
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@cladisch
cladisch committed Jun 27, 2013
1 parent f722406 commit 8f898e9
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Showing 6 changed files with 16 additions and 32 deletions.
1 change: 1 addition & 0 deletions sound/usb/card.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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 */
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4 changes: 1 addition & 3 deletions sound/usb/clock.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
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34 changes: 10 additions & 24 deletions sound/usb/format.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand Down Expand Up @@ -360,11 +359,8 @@ static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
*/
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;

Expand All @@ -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;
}
Expand All @@ -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);
Expand All @@ -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:
Expand All @@ -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);
Expand All @@ -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",
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2 changes: 1 addition & 1 deletion sound/usb/format.h
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Original file line number Diff line number Diff line change
Expand Up @@ -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 */
4 changes: 1 addition & 3 deletions sound/usb/pcm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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);
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3 changes: 2 additions & 1 deletion sound/usb/stream.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
Expand Down Expand Up @@ -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);
Expand Down

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