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linux/sound/usb/stream.c
Ruslan Bilovol 9a2fe9b801 ALSA: usb: initial USB Audio Device Class 3.0 support 
Recently released USB Audio Class 3.0 specification
introduces many significant changes comparing to
previous versions, like
 - new Power Domains, support for LPM/L1
 - new Cluster descriptor
 - changed layout of all class-specific descriptors
 - new High Capability descriptors
 - New class-specific String descriptors
 - new and removed units
 - additional sources for interrupts
 - removed Type II Audio Data Formats
 - ... and many other things (check spec)

It also provides backward compatibility through
multiple configurations, as well as requires
mandatory support for BADD (Basic Audio Device
Definition) on each ADC3.0 compliant device

This patch adds initial support of UAC3 specification
that is enough for Generic I/O Profile (BAOF, BAIF)
device support from BADD document.

Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-03-21 11:46:33 +01:00

1006 lines
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <linux/usb/audio-v3.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/control.h>
#include <sound/tlv.h>
#include "usbaudio.h"
#include "card.h"
#include "proc.h"
#include "quirks.h"
#include "endpoint.h"
#include "pcm.h"
#include "helper.h"
#include "format.h"
#include "clock.h"
#include "stream.h"
/*
* free a substream
*/
static void free_substream(struct snd_usb_substream *subs)
{
struct audioformat *fp, *n;
if (!subs->num_formats)
return; /* not initialized */
list_for_each_entry_safe(fp, n, &subs->fmt_list, list) {
kfree(fp->rate_table);
kfree(fp->chmap);
kfree(fp);
}
kfree(subs->rate_list.list);
}
/*
* free a usb stream instance
*/
static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
{
free_substream(&stream->substream[0]);
free_substream(&stream->substream[1]);
list_del(&stream->list);
kfree(stream);
}
static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
{
struct snd_usb_stream *stream = pcm->private_data;
if (stream) {
stream->pcm = NULL;
snd_usb_audio_stream_free(stream);
}
}
/*
* initialize the substream instance.
*/
static void snd_usb_init_substream(struct snd_usb_stream *as,
int stream,
struct audioformat *fp)
{
struct snd_usb_substream *subs = &as->substream[stream];
INIT_LIST_HEAD(&subs->fmt_list);
spin_lock_init(&subs->lock);
subs->stream = as;
subs->direction = stream;
subs->dev = as->chip->dev;
subs->txfr_quirk = as->chip->txfr_quirk;
subs->tx_length_quirk = as->chip->tx_length_quirk;
subs->speed = snd_usb_get_speed(subs->dev);
subs->pkt_offset_adj = 0;
snd_usb_set_pcm_ops(as->pcm, stream);
list_add_tail(&fp->list, &subs->fmt_list);
subs->formats |= fp->formats;
subs->num_formats++;
subs->fmt_type = fp->fmt_type;
subs->ep_num = fp->endpoint;
if (fp->channels > subs->channels_max)
subs->channels_max = fp->channels;
}
/* kctl callbacks for usb-audio channel maps */
static int usb_chmap_ctl_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
struct snd_usb_substream *subs = info->private_data;
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = subs->channels_max;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = SNDRV_CHMAP_LAST;
return 0;
}
/* check whether a duplicated entry exists in the audiofmt list */
static bool have_dup_chmap(struct snd_usb_substream *subs,
struct audioformat *fp)
{
struct audioformat *prev = fp;
list_for_each_entry_continue_reverse(prev, &subs->fmt_list, list) {
if (prev->chmap &&
!memcmp(prev->chmap, fp->chmap, sizeof(*fp->chmap)))
return true;
}
return false;
}
static int usb_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
unsigned int size, unsigned int __user *tlv)
{
struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
struct snd_usb_substream *subs = info->private_data;
struct audioformat *fp;
unsigned int __user *dst;
int count = 0;
if (size < 8)
return -ENOMEM;
if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
return -EFAULT;
size -= 8;
dst = tlv + 2;
list_for_each_entry(fp, &subs->fmt_list, list) {
int i, ch_bytes;
if (!fp->chmap)
continue;
if (have_dup_chmap(subs, fp))
continue;
/* copy the entry */
ch_bytes = fp->chmap->channels * 4;
if (size < 8 + ch_bytes)
return -ENOMEM;
if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
put_user(ch_bytes, dst + 1))
return -EFAULT;
dst += 2;
for (i = 0; i < fp->chmap->channels; i++, dst++) {
if (put_user(fp->chmap->map[i], dst))
return -EFAULT;
}
count += 8 + ch_bytes;
size -= 8 + ch_bytes;
}
if (put_user(count, tlv + 1))
return -EFAULT;
return 0;
}
static int usb_chmap_ctl_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
struct snd_usb_substream *subs = info->private_data;
struct snd_pcm_chmap_elem *chmap = NULL;
int i;
memset(ucontrol->value.integer.value, 0,
sizeof(ucontrol->value.integer.value));
if (subs->cur_audiofmt)
chmap = subs->cur_audiofmt->chmap;
if (chmap) {
for (i = 0; i < chmap->channels; i++)
ucontrol->value.integer.value[i] = chmap->map[i];
}
return 0;
}
/* create a chmap kctl assigned to the given USB substream */
static int add_chmap(struct snd_pcm *pcm, int stream,
struct snd_usb_substream *subs)
{
struct audioformat *fp;
struct snd_pcm_chmap *chmap;
struct snd_kcontrol *kctl;
int err;
list_for_each_entry(fp, &subs->fmt_list, list)
if (fp->chmap)
goto ok;
/* no chmap is found */
return 0;
ok:
err = snd_pcm_add_chmap_ctls(pcm, stream, NULL, 0, 0, &chmap);
if (err < 0)
return err;
/* override handlers */
chmap->private_data = subs;
kctl = chmap->kctl;
kctl->info = usb_chmap_ctl_info;
kctl->get = usb_chmap_ctl_get;
kctl->tlv.c = usb_chmap_ctl_tlv;
return 0;
}
/* convert from USB ChannelConfig bits to ALSA chmap element */
static struct snd_pcm_chmap_elem *convert_chmap(int channels, unsigned int bits,
int protocol)
{
static unsigned int uac1_maps[] = {
SNDRV_CHMAP_FL, /* left front */
SNDRV_CHMAP_FR, /* right front */
SNDRV_CHMAP_FC, /* center front */
SNDRV_CHMAP_LFE, /* LFE */
SNDRV_CHMAP_SL, /* left surround */
SNDRV_CHMAP_SR, /* right surround */
SNDRV_CHMAP_FLC, /* left of center */
SNDRV_CHMAP_FRC, /* right of center */
SNDRV_CHMAP_RC, /* surround */
SNDRV_CHMAP_SL, /* side left */
SNDRV_CHMAP_SR, /* side right */
SNDRV_CHMAP_TC, /* top */
0 /* terminator */
};
static unsigned int uac2_maps[] = {
SNDRV_CHMAP_FL, /* front left */
SNDRV_CHMAP_FR, /* front right */
SNDRV_CHMAP_FC, /* front center */
SNDRV_CHMAP_LFE, /* LFE */
SNDRV_CHMAP_RL, /* back left */
SNDRV_CHMAP_RR, /* back right */
SNDRV_CHMAP_FLC, /* front left of center */
SNDRV_CHMAP_FRC, /* front right of center */
SNDRV_CHMAP_RC, /* back center */
SNDRV_CHMAP_SL, /* side left */
SNDRV_CHMAP_SR, /* side right */
SNDRV_CHMAP_TC, /* top center */
SNDRV_CHMAP_TFL, /* top front left */
SNDRV_CHMAP_TFC, /* top front center */
SNDRV_CHMAP_TFR, /* top front right */
SNDRV_CHMAP_TRL, /* top back left */
SNDRV_CHMAP_TRC, /* top back center */
SNDRV_CHMAP_TRR, /* top back right */
SNDRV_CHMAP_TFLC, /* top front left of center */
SNDRV_CHMAP_TFRC, /* top front right of center */
SNDRV_CHMAP_LLFE, /* left LFE */
SNDRV_CHMAP_RLFE, /* right LFE */
SNDRV_CHMAP_TSL, /* top side left */
SNDRV_CHMAP_TSR, /* top side right */
SNDRV_CHMAP_BC, /* bottom center */
SNDRV_CHMAP_RLC, /* back left of center */
SNDRV_CHMAP_RRC, /* back right of center */
0 /* terminator */
};
struct snd_pcm_chmap_elem *chmap;
const unsigned int *maps;
int c;
if (channels > ARRAY_SIZE(chmap->map))
return NULL;
chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
if (!chmap)
return NULL;
maps = protocol == UAC_VERSION_2 ? uac2_maps : uac1_maps;
chmap->channels = channels;
c = 0;
if (bits) {
for (; bits && *maps; maps++, bits >>= 1)
if (bits & 1)
chmap->map[c++] = *maps;
} else {
/* If we're missing wChannelConfig, then guess something
to make sure the channel map is not skipped entirely */
if (channels == 1)
chmap->map[c++] = SNDRV_CHMAP_MONO;
else
for (; c < channels && *maps; maps++)
chmap->map[c++] = *maps;
}
for (; c < channels; c++)
chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
return chmap;
}
/* UAC3 device stores channels information in Cluster Descriptors */
static struct
snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
*cluster)
{
unsigned int channels = cluster->bNrChannels;
struct snd_pcm_chmap_elem *chmap;
void *p = cluster;
int len, c;
if (channels > ARRAY_SIZE(chmap->map))
return NULL;
chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
if (!chmap)
return NULL;
len = le16_to_cpu(cluster->wLength);
c = 0;
p += sizeof(struct uac3_cluster_header_descriptor);
while (((p - (void *)cluster) < len) && (c < channels)) {
struct uac3_cluster_segment_descriptor *cs_desc = p;
u16 cs_len;
u8 cs_type;
cs_len = le16_to_cpu(cs_desc->wLength);
cs_type = cs_desc->bSegmentType;
if (cs_type == UAC3_CHANNEL_INFORMATION) {
struct uac3_cluster_information_segment_descriptor *is = p;
unsigned char map;
/*
* TODO: this conversion is not complete, update it
* after adding UAC3 values to asound.h
*/
switch (is->bChPurpose) {
case UAC3_CH_MONO:
map = SNDRV_CHMAP_MONO;
break;
case UAC3_CH_LEFT:
case UAC3_CH_FRONT_LEFT:
case UAC3_CH_HEADPHONE_LEFT:
map = SNDRV_CHMAP_FL;
break;
case UAC3_CH_RIGHT:
case UAC3_CH_FRONT_RIGHT:
case UAC3_CH_HEADPHONE_RIGHT:
map = SNDRV_CHMAP_FR;
break;
case UAC3_CH_FRONT_CENTER:
map = SNDRV_CHMAP_FC;
break;
case UAC3_CH_FRONT_LEFT_OF_CENTER:
map = SNDRV_CHMAP_FLC;
break;
case UAC3_CH_FRONT_RIGHT_OF_CENTER:
map = SNDRV_CHMAP_FRC;
break;
case UAC3_CH_SIDE_LEFT:
map = SNDRV_CHMAP_SL;
break;
case UAC3_CH_SIDE_RIGHT:
map = SNDRV_CHMAP_SR;
break;
case UAC3_CH_BACK_LEFT:
map = SNDRV_CHMAP_RL;
break;
case UAC3_CH_BACK_RIGHT:
map = SNDRV_CHMAP_RR;
break;
case UAC3_CH_BACK_CENTER:
map = SNDRV_CHMAP_RC;
break;
case UAC3_CH_BACK_LEFT_OF_CENTER:
map = SNDRV_CHMAP_RLC;
break;
case UAC3_CH_BACK_RIGHT_OF_CENTER:
map = SNDRV_CHMAP_RRC;
break;
case UAC3_CH_TOP_CENTER:
map = SNDRV_CHMAP_TC;
break;
case UAC3_CH_TOP_FRONT_LEFT:
map = SNDRV_CHMAP_TFL;
break;
case UAC3_CH_TOP_FRONT_RIGHT:
map = SNDRV_CHMAP_TFR;
break;
case UAC3_CH_TOP_FRONT_CENTER:
map = SNDRV_CHMAP_TFC;
break;
case UAC3_CH_TOP_FRONT_LOC:
map = SNDRV_CHMAP_TFLC;
break;
case UAC3_CH_TOP_FRONT_ROC:
map = SNDRV_CHMAP_TFRC;
break;
case UAC3_CH_TOP_SIDE_LEFT:
map = SNDRV_CHMAP_TSL;
break;
case UAC3_CH_TOP_SIDE_RIGHT:
map = SNDRV_CHMAP_TSR;
break;
case UAC3_CH_TOP_BACK_LEFT:
map = SNDRV_CHMAP_TRL;
break;
case UAC3_CH_TOP_BACK_RIGHT:
map = SNDRV_CHMAP_TRR;
break;
case UAC3_CH_TOP_BACK_CENTER:
map = SNDRV_CHMAP_TRC;
break;
case UAC3_CH_BOTTOM_CENTER:
map = SNDRV_CHMAP_BC;
break;
case UAC3_CH_LOW_FREQUENCY_EFFECTS:
map = SNDRV_CHMAP_LFE;
break;
case UAC3_CH_LFE_LEFT:
map = SNDRV_CHMAP_LLFE;
break;
case UAC3_CH_LFE_RIGHT:
map = SNDRV_CHMAP_RLFE;
break;
case UAC3_CH_RELATIONSHIP_UNDEFINED:
default:
map = SNDRV_CHMAP_UNKNOWN;
break;
}
chmap->map[c++] = map;
}
p += cs_len;
}
if (channels < c)
pr_err("%s: channel number mismatch\n", __func__);
chmap->channels = channels;
for (; c < channels; c++)
chmap->map[c] = SNDRV_CHMAP_UNKNOWN;
return chmap;
}
/*
* add this endpoint to the chip instance.
* if a stream with the same endpoint already exists, append to it.
* if not, create a new pcm stream. note, fp is added to the substream
* fmt_list and will be freed on the chip instance release. do not free
* fp or do remove it from the substream fmt_list to avoid double-free.
*/
int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
int stream,
struct audioformat *fp)
{
struct snd_usb_stream *as;
struct snd_usb_substream *subs;
struct snd_pcm *pcm;
int err;
list_for_each_entry(as, &chip->pcm_list, list) {
if (as->fmt_type != fp->fmt_type)
continue;
subs = &as->substream[stream];
if (subs->ep_num == fp->endpoint) {
list_add_tail(&fp->list, &subs->fmt_list);
subs->num_formats++;
subs->formats |= fp->formats;
return 0;
}
}
/* look for an empty stream */
list_for_each_entry(as, &chip->pcm_list, list) {
if (as->fmt_type != fp->fmt_type)
continue;
subs = &as->substream[stream];
if (subs->ep_num)
continue;
err = snd_pcm_new_stream(as->pcm, stream, 1);
if (err < 0)
return err;
snd_usb_init_substream(as, stream, fp);
return add_chmap(as->pcm, stream, subs);
}
/* create a new pcm */
as = kzalloc(sizeof(*as), GFP_KERNEL);
if (!as)
return -ENOMEM;
as->pcm_index = chip->pcm_devs;
as->chip = chip;
as->fmt_type = fp->fmt_type;
err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
&pcm);
if (err < 0) {
kfree(as);
return err;
}
as->pcm = pcm;
pcm->private_data = as;
pcm->private_free = snd_usb_audio_pcm_free;
pcm->info_flags = 0;
if (chip->pcm_devs > 0)
sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
else
strcpy(pcm->name, "USB Audio");
snd_usb_init_substream(as, stream, fp);
/*
* Keep using head insertion for M-Audio Audiophile USB (tm) which has a
* fix to swap capture stream order in conf/cards/USB-audio.conf
*/
if (chip->usb_id == USB_ID(0x0763, 0x2003))
list_add(&as->list, &chip->pcm_list);
else
list_add_tail(&as->list, &chip->pcm_list);
chip->pcm_devs++;
snd_usb_proc_pcm_format_add(as);
return add_chmap(pcm, stream, &as->substream[stream]);
}
static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
struct usb_host_interface *alts,
int protocol, int iface_no)
{
/* parsed with a v1 header here. that's ok as we only look at the
* header first which is the same for both versions */
struct uac_iso_endpoint_descriptor *csep;
struct usb_interface_descriptor *altsd = get_iface_desc(alts);
int attributes = 0;
csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
/* Creamware Noah has this descriptor after the 2nd endpoint */
if (!csep && altsd->bNumEndpoints >= 2)
csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
/*
* If we can't locate the USB_DT_CS_ENDPOINT descriptor in the extra
* bytes after the first endpoint, go search the entire interface.
* Some devices have it directly *before* the standard endpoint.
*/
if (!csep)
csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
if (!csep || csep->bLength < 7 ||
csep->bDescriptorSubtype != UAC_EP_GENERAL) {
usb_audio_warn(chip,
"%u:%d : no or invalid class specific endpoint descriptor\n",
iface_no, altsd->bAlternateSetting);
return 0;
}
if (protocol == UAC_VERSION_1) {
attributes = csep->bmAttributes;
} else {
struct uac2_iso_endpoint_descriptor *csep2 =
(struct uac2_iso_endpoint_descriptor *) csep;
attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
/* emulate the endpoint attributes of a v1 device */
if (csep2->bmControls & UAC2_CONTROL_PITCH)
attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
}
return attributes;
}
/* find an input terminal descriptor (either UAC1 or UAC2) with the given
* terminal id
*/
static void *
snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
int terminal_id)
{
struct uac2_input_terminal_descriptor *term = NULL;
while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
ctrl_iface->extralen,
term, UAC_INPUT_TERMINAL))) {
if (term->bTerminalID == terminal_id)
return term;
}
return NULL;
}
static void *
snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
int terminal_id)
{
/* OK to use with both UAC2 and UAC3 */
struct uac2_output_terminal_descriptor *term = NULL;
while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
ctrl_iface->extralen,
term, UAC_OUTPUT_TERMINAL))) {
if (term->bTerminalID == terminal_id)
return term;
}
return NULL;
}
int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
{
struct usb_device *dev;
struct usb_interface *iface;
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
int i, altno, err, stream;
u64 format = 0;
unsigned int num_channels = 0;
struct audioformat *fp = NULL;
int num, protocol, clock = 0;
struct uac_format_type_i_continuous_descriptor *fmt = NULL;
struct snd_pcm_chmap_elem *chmap_v3 = NULL;
unsigned int chconfig;
dev = chip->dev;
/* parse the interface's altsettings */
iface = usb_ifnum_to_if(dev, iface_no);
num = iface->num_altsetting;
/*
* Dallas DS4201 workaround: It presents 5 altsettings, but the last
* one misses syncpipe, and does not produce any sound.
*/
if (chip->usb_id == USB_ID(0x04fa, 0x4201))
num = 4;
for (i = 0; i < num; i++) {
alts = &iface->altsetting[i];
altsd = get_iface_desc(alts);
protocol = altsd->bInterfaceProtocol;
/* skip invalid one */
if (((altsd->bInterfaceClass != USB_CLASS_AUDIO ||
(altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC)) &&
altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
altsd->bNumEndpoints < 1 ||
le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
continue;
/* must be isochronous */
if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
USB_ENDPOINT_XFER_ISOC)
continue;
/* check direction */
stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
altno = altsd->bAlternateSetting;
if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
continue;
/*
* Roland audio streaming interfaces are marked with protocols
* 0/1/2, but are UAC 1 compatible.
*/
if (USB_ID_VENDOR(chip->usb_id) == 0x0582 &&
altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
protocol <= 2)
protocol = UAC_VERSION_1;
chconfig = 0;
/* get audio formats */
switch (protocol) {
default:
dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
iface_no, altno, protocol);
protocol = UAC_VERSION_1;
/* fall through */
case UAC_VERSION_1: {
struct uac1_as_header_descriptor *as =
snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
struct uac_input_terminal_descriptor *iterm;
if (!as) {
dev_err(&dev->dev,
"%u:%d : UAC_AS_GENERAL descriptor not found\n",
iface_no, altno);
continue;
}
if (as->bLength < sizeof(*as)) {
dev_err(&dev->dev,
"%u:%d : invalid UAC_AS_GENERAL desc\n",
iface_no, altno);
continue;
}
format = le16_to_cpu(as->wFormatTag); /* remember the format value */
iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
as->bTerminalLink);
if (iterm) {
num_channels = iterm->bNrChannels;
chconfig = le16_to_cpu(iterm->wChannelConfig);
}
break;
}
case UAC_VERSION_2: {
struct uac2_input_terminal_descriptor *input_term;
struct uac2_output_terminal_descriptor *output_term;
struct uac2_as_header_descriptor *as =
snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
if (!as) {
dev_err(&dev->dev,
"%u:%d : UAC_AS_GENERAL descriptor not found\n",
iface_no, altno);
continue;
}
if (as->bLength < sizeof(*as)) {
dev_err(&dev->dev,
"%u:%d : invalid UAC_AS_GENERAL desc\n",
iface_no, altno);
continue;
}
num_channels = as->bNrChannels;
format = le32_to_cpu(as->bmFormats);
chconfig = le32_to_cpu(as->bmChannelConfig);
/* lookup the terminal associated to this interface
* to extract the clock */
input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
as->bTerminalLink);
if (input_term) {
clock = input_term->bCSourceID;
if (!chconfig && (num_channels == input_term->bNrChannels))
chconfig = le32_to_cpu(input_term->bmChannelConfig);
break;
}
output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
as->bTerminalLink);
if (output_term) {
clock = output_term->bCSourceID;
break;
}
dev_err(&dev->dev,
"%u:%d : bogus bTerminalLink %d\n",
iface_no, altno, as->bTerminalLink);
continue;
}
case UAC_VERSION_3: {
struct uac3_input_terminal_descriptor *input_term;
struct uac3_output_terminal_descriptor *output_term;
struct uac3_as_header_descriptor *as;
struct uac3_cluster_header_descriptor *cluster;
struct uac3_hc_descriptor_header hc_header;
u16 cluster_id, wLength;
as = snd_usb_find_csint_desc(alts->extra,
alts->extralen,
NULL, UAC_AS_GENERAL);
if (!as) {
dev_err(&dev->dev,
"%u:%d : UAC_AS_GENERAL descriptor not found\n",
iface_no, altno);
continue;
}
if (as->bLength < sizeof(*as)) {
dev_err(&dev->dev,
"%u:%d : invalid UAC_AS_GENERAL desc\n",
iface_no, altno);
continue;
}
cluster_id = le16_to_cpu(as->wClusterDescrID);
if (!cluster_id) {
dev_err(&dev->dev,
"%u:%d : no cluster descriptor\n",
iface_no, altno);
continue;
}
/*
* Get number of channels and channel map through
* High Capability Cluster Descriptor
*
* First step: get High Capability header and
* read size of Cluster Descriptor
*/
err = snd_usb_ctl_msg(chip->dev,
usb_rcvctrlpipe(chip->dev, 0),
UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
cluster_id,
snd_usb_ctrl_intf(chip),
&hc_header, sizeof(hc_header));
if (err < 0)
return err;
else if (err != sizeof(hc_header)) {
dev_err(&dev->dev,
"%u:%d : can't get High Capability descriptor\n",
iface_no, altno);
return -EIO;
}
/*
* Second step: allocate needed amount of memory
* and request Cluster Descriptor
*/
wLength = le16_to_cpu(hc_header.wLength);
cluster = kzalloc(wLength, GFP_KERNEL);
if (!cluster)
return -ENOMEM;
err = snd_usb_ctl_msg(chip->dev,
usb_rcvctrlpipe(chip->dev, 0),
UAC3_CS_REQ_HIGH_CAPABILITY_DESCRIPTOR,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
cluster_id,
snd_usb_ctrl_intf(chip),
cluster, wLength);
if (err < 0) {
kfree(cluster);
return err;
} else if (err != wLength) {
dev_err(&dev->dev,
"%u:%d : can't get Cluster Descriptor\n",
iface_no, altno);
kfree(cluster);
return -EIO;
}
num_channels = cluster->bNrChannels;
chmap_v3 = convert_chmap_v3(cluster);
kfree(cluster);
format = le64_to_cpu(as->bmFormats);
/* lookup the terminal associated to this interface
* to extract the clock */
input_term = snd_usb_find_input_terminal_descriptor(
chip->ctrl_intf,
as->bTerminalLink);
if (input_term) {
clock = input_term->bCSourceID;
break;
}
output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
as->bTerminalLink);
if (output_term) {
clock = output_term->bCSourceID;
break;
}
dev_err(&dev->dev,
"%u:%d : bogus bTerminalLink %d\n",
iface_no, altno, as->bTerminalLink);
continue;
}
}
if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
/* get format type */
fmt = snd_usb_find_csint_desc(alts->extra,
alts->extralen,
NULL, UAC_FORMAT_TYPE);
if (!fmt) {
dev_err(&dev->dev,
"%u:%d : no UAC_FORMAT_TYPE desc\n",
iface_no, altno);
continue;
}
if (((protocol == UAC_VERSION_1) && (fmt->bLength < 8))
|| ((protocol == UAC_VERSION_2) &&
(fmt->bLength < 6))) {
dev_err(&dev->dev,
"%u:%d : invalid UAC_FORMAT_TYPE desc\n",
iface_no, altno);
continue;
}
/*
* Blue Microphones workaround: The last altsetting is
* identical with the previous one, except for a larger
* packet size, but is actually a mislabeled two-channel
* setting; ignore it.
*/
if (fmt->bNrChannels == 1 &&
fmt->bSubframeSize == 2 &&
altno == 2 && num == 3 &&
fp && fp->altsetting == 1 && fp->channels == 1 &&
fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
protocol == UAC_VERSION_1 &&
le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
fp->maxpacksize * 2)
continue;
}
fp = kzalloc(sizeof(*fp), GFP_KERNEL);
if (!fp)
return -ENOMEM;
fp->iface = iface_no;
fp->altsetting = altno;
fp->altset_idx = i;
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)
fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
* (fp->maxpacksize & 0x7ff);
fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol, iface_no);
fp->clock = clock;
INIT_LIST_HEAD(&fp->list);
/* some quirks for attributes here */
snd_usb_audioformat_attributes_quirk(chip, fp, stream);
/* ok, let's parse further... */
if (protocol == UAC_VERSION_1 || protocol == UAC_VERSION_2) {
if (snd_usb_parse_audio_format(chip, fp, format,
fmt, stream) < 0) {
kfree(fp->rate_table);
kfree(fp);
fp = NULL;
continue;
}
} else {
struct uac3_as_header_descriptor *as;
as = snd_usb_find_csint_desc(alts->extra,
alts->extralen,
NULL, UAC_AS_GENERAL);
if (snd_usb_parse_audio_format_v3(chip, fp, as,
stream) < 0) {
kfree(fp->rate_table);
kfree(fp);
fp = NULL;
continue;
}
}
/* Create chmap */
if (fp->channels != num_channels)
chconfig = 0;
if (protocol == UAC_VERSION_3)
fp->chmap = chmap_v3;
else
fp->chmap = convert_chmap(fp->channels, chconfig,
protocol);
dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
err = snd_usb_add_audio_stream(chip, stream, fp);
if (err < 0) {
list_del(&fp->list); /* unlink for avoiding double-free */
kfree(fp->rate_table);
kfree(fp->chmap);
kfree(fp);
return err;
}
/* try to set the interface... */
usb_set_interface(chip->dev, iface_no, altno);
snd_usb_init_pitch(chip, iface_no, alts, fp);
snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);
}
return 0;
}
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