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linux/sound/usb/stream.c
Takashi Iwai 5fadc941d0 ALSA: usb-audio: Fix init call orders for UAC1 
There have been reports of USB-audio driver spewing errors at the
probe time on a few devices like Jabra and Logitech.  The suggested
fix there couldn't be applied as is, unfortunately, because it'll
likely break other devices.

But, the patch suggested an interesting point: looking at the current
init code in stream.c, one may notice that it does initialize
differently from the device setup in endpoint.c.  Namely, for UAC1, we
should call snd_usb_init_pitch() and snd_usb_init_sample_rate() after
setting the interface, while the init sequence at parsing calls them
before setting the interface blindly.

This patch changes the init sequence at parsing for UAC1 (and other
devices that need a similar behavior) to be aligned with the rest of
the code, setting the interface at first.  And, this fixes the
long-standing problems on a few UAC1 devices like Jabra / Logitech,
as reported, too.

Reported-and-tested-by: Joakim Tjernlund <joakim.tjernlund@infinera.com>
Closes: https://lore.kernel.org/r/202bbbc0f51522e8545783c4c5577d12a8e2d56d.camel@infinera.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20230821111857.28926-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-08-21 16:20:25 +02:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*/
#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"
#include "power.h"
#include "media.h"
static void audioformat_free(struct audioformat *fp)
{
list_del(&fp->list); /* unlink for avoiding double-free */
kfree(fp->rate_table);
kfree(fp->chmap);
kfree(fp);
}
/*
* 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)
audioformat_free(fp);
kfree(subs->str_pd);
snd_media_stream_delete(subs);
}
/*
* 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_power_domain *pd)
{
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->quirk_flags & QUIRK_FLAG_ALIGN_TRANSFER);
subs->tx_length_quirk = !!(as->chip->quirk_flags & QUIRK_FLAG_TX_LENGTH);
subs->speed = snd_usb_get_speed(subs->dev);
subs->pkt_offset_adj = 0;
subs->stream_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;
if (pd) {
subs->str_pd = pd;
/* Initialize Power Domain to idle status D1 */
snd_usb_power_domain_set(subs->stream->chip, pd,
UAC3_PD_STATE_D1);
}
snd_usb_preallocate_buffer(subs);
}
/* 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 = 0;
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];
}
for (; i < subs->channels_max; i++)
ucontrol->value.integer.value[i] = 0;
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 const 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 const 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->bChRelationship) {
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.
*/
static int __snd_usb_add_audio_stream(struct snd_usb_audio *chip,
int stream,
struct audioformat *fp,
struct snd_usb_power_domain *pd)
{
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;
}
}
if (chip->card->registered)
chip->need_delayed_register = true;
/* 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, pd);
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, pd);
/*
* 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]);
}
int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
int stream,
struct audioformat *fp)
{
return __snd_usb_add_audio_stream(chip, stream, fp, NULL);
}
static int snd_usb_add_audio_stream_v3(struct snd_usb_audio *chip,
int stream,
struct audioformat *fp,
struct snd_usb_power_domain *pd)
{
return __snd_usb_add_audio_stream(chip, stream, fp, pd);
}
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)
goto error;
if (protocol == UAC_VERSION_1) {
attributes = csep->bmAttributes;
} else if (protocol == UAC_VERSION_2) {
struct uac2_iso_endpoint_descriptor *csep2 =
(struct uac2_iso_endpoint_descriptor *) csep;
if (csep2->bLength < sizeof(*csep2))
goto error;
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;
} else { /* UAC_VERSION_3 */
struct uac3_iso_endpoint_descriptor *csep3 =
(struct uac3_iso_endpoint_descriptor *) csep;
if (csep3->bLength < sizeof(*csep3))
goto error;
/* emulate the endpoint attributes of a v1 device */
if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
}
return attributes;
error:
usb_audio_warn(chip,
"%u:%d : no or invalid class specific endpoint descriptor\n",
iface_no, altsd->bAlternateSetting);
return 0;
}
/* 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, int protocol)
{
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 (!snd_usb_validate_audio_desc(term, protocol))
continue;
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, int protocol)
{
/* 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 (!snd_usb_validate_audio_desc(term, protocol))
continue;
if (term->bTerminalID == terminal_id)
return term;
}
return NULL;
}
static struct audioformat *
audio_format_alloc_init(struct snd_usb_audio *chip,
struct usb_host_interface *alts,
int protocol, int iface_no, int altset_idx,
int altno, int num_channels, int clock)
{
struct audioformat *fp;
fp = kzalloc(sizeof(*fp), GFP_KERNEL);
if (!fp)
return NULL;
fp->iface = iface_no;
fp->altsetting = altno;
fp->altset_idx = altset_idx;
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(chip->dev) == USB_SPEED_HIGH)
fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
* (fp->maxpacksize & 0x7ff);
fp->clock = clock;
INIT_LIST_HEAD(&fp->list);
return fp;
}
static struct audioformat *
snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
struct usb_host_interface *alts,
int protocol, int iface_no, int altset_idx,
int altno, int stream, int bm_quirk)
{
struct usb_device *dev = chip->dev;
struct uac_format_type_i_continuous_descriptor *fmt;
unsigned int num_channels = 0, chconfig = 0;
struct audioformat *fp;
int clock = 0;
u64 format;
/* get audio formats */
if (protocol == 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);
return NULL;
}
if (as->bLength < sizeof(*as)) {
dev_err(&dev->dev,
"%u:%d : invalid UAC_AS_GENERAL desc\n",
iface_no, altno);
return NULL;
}
format = le16_to_cpu(as->wFormatTag); /* remember the format value */
iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
as->bTerminalLink,
protocol);
if (iterm) {
num_channels = iterm->bNrChannels;
chconfig = le16_to_cpu(iterm->wChannelConfig);
}
} else { /* 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);
return NULL;
}
if (as->bLength < sizeof(*as)) {
dev_err(&dev->dev,
"%u:%d : invalid UAC_AS_GENERAL desc\n",
iface_no, altno);
return NULL;
}
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,
protocol);
if (input_term) {
clock = input_term->bCSourceID;
if (!chconfig && (num_channels == input_term->bNrChannels))
chconfig = le32_to_cpu(input_term->bmChannelConfig);
goto found_clock;
}
output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
as->bTerminalLink,
protocol);
if (output_term) {
clock = output_term->bCSourceID;
goto found_clock;
}
dev_err(&dev->dev,
"%u:%d : bogus bTerminalLink %d\n",
iface_no, altno, as->bTerminalLink);
return NULL;
}
found_clock:
/* 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);
return NULL;
}
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);
return NULL;
}
/*
* 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.
*
* Part 2: analyze quirk flag and format
*/
if (bm_quirk && fmt->bNrChannels == 1 && fmt->bSubframeSize == 2)
return NULL;
fp = audio_format_alloc_init(chip, alts, protocol, iface_no,
altset_idx, altno, num_channels, clock);
if (!fp)
return ERR_PTR(-ENOMEM);
fp->attributes = parse_uac_endpoint_attributes(chip, alts, protocol,
iface_no);
/* some quirks for attributes here */
snd_usb_audioformat_attributes_quirk(chip, fp, stream);
/* ok, let's parse further... */
if (snd_usb_parse_audio_format(chip, fp, format,
fmt, stream) < 0) {
audioformat_free(fp);
return NULL;
}
/* Create chmap */
if (fp->channels != num_channels)
chconfig = 0;
fp->chmap = convert_chmap(fp->channels, chconfig, protocol);
return fp;
}
static struct audioformat *
snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
struct usb_host_interface *alts,
struct snd_usb_power_domain **pd_out,
int iface_no, int altset_idx,
int altno, int stream)
{
struct usb_device *dev = chip->dev;
struct uac3_input_terminal_descriptor *input_term;
struct uac3_output_terminal_descriptor *output_term;
struct uac3_cluster_header_descriptor *cluster;
struct uac3_as_header_descriptor *as = NULL;
struct uac3_hc_descriptor_header hc_header;
struct snd_pcm_chmap_elem *chmap;
struct snd_usb_power_domain *pd;
unsigned char badd_profile;
u64 badd_formats = 0;
unsigned int num_channels;
struct audioformat *fp;
u16 cluster_id, wLength;
int clock = 0;
int err;
badd_profile = chip->badd_profile;
if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
unsigned int maxpacksize =
le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
switch (maxpacksize) {
default:
dev_err(&dev->dev,
"%u:%d : incorrect wMaxPacketSize for BADD profile\n",
iface_no, altno);
return NULL;
case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_16:
case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_16:
badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
num_channels = 1;
break;
case UAC3_BADD_EP_MAXPSIZE_SYNC_MONO_24:
case UAC3_BADD_EP_MAXPSIZE_ASYNC_MONO_24:
badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
num_channels = 1;
break;
case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_16:
case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_16:
badd_formats = SNDRV_PCM_FMTBIT_S16_LE;
num_channels = 2;
break;
case UAC3_BADD_EP_MAXPSIZE_SYNC_STEREO_24:
case UAC3_BADD_EP_MAXPSIZE_ASYNC_STEREO_24:
badd_formats = SNDRV_PCM_FMTBIT_S24_3LE;
num_channels = 2;
break;
}
chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
if (!chmap)
return ERR_PTR(-ENOMEM);
if (num_channels == 1) {
chmap->map[0] = SNDRV_CHMAP_MONO;
} else {
chmap->map[0] = SNDRV_CHMAP_FL;
chmap->map[1] = SNDRV_CHMAP_FR;
}
chmap->channels = num_channels;
clock = UAC3_BADD_CS_ID9;
goto found_clock;
}
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);
return NULL;
}
if (as->bLength < sizeof(*as)) {
dev_err(&dev->dev,
"%u:%d : invalid UAC_AS_GENERAL desc\n",
iface_no, altno);
return NULL;
}
cluster_id = le16_to_cpu(as->wClusterDescrID);
if (!cluster_id) {
dev_err(&dev->dev,
"%u:%d : no cluster descriptor\n",
iface_no, altno);
return NULL;
}
/*
* 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_PTR(err);
else if (err != sizeof(hc_header)) {
dev_err(&dev->dev,
"%u:%d : can't get High Capability descriptor\n",
iface_no, altno);
return ERR_PTR(-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 ERR_PTR(-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_PTR(err);
} else if (err != wLength) {
dev_err(&dev->dev,
"%u:%d : can't get Cluster Descriptor\n",
iface_no, altno);
kfree(cluster);
return ERR_PTR(-EIO);
}
num_channels = cluster->bNrChannels;
chmap = convert_chmap_v3(cluster);
kfree(cluster);
/*
* lookup the terminal associated to this interface
* to extract the clock
*/
input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
as->bTerminalLink,
UAC_VERSION_3);
if (input_term) {
clock = input_term->bCSourceID;
goto found_clock;
}
output_term = snd_usb_find_output_terminal_descriptor(chip->ctrl_intf,
as->bTerminalLink,
UAC_VERSION_3);
if (output_term) {
clock = output_term->bCSourceID;
goto found_clock;
}
dev_err(&dev->dev, "%u:%d : bogus bTerminalLink %d\n",
iface_no, altno, as->bTerminalLink);
kfree(chmap);
return NULL;
found_clock:
fp = audio_format_alloc_init(chip, alts, UAC_VERSION_3, iface_no,
altset_idx, altno, num_channels, clock);
if (!fp) {
kfree(chmap);
return ERR_PTR(-ENOMEM);
}
fp->chmap = chmap;
if (badd_profile >= UAC3_FUNCTION_SUBCLASS_GENERIC_IO) {
fp->attributes = 0; /* No attributes */
fp->fmt_type = UAC_FORMAT_TYPE_I;
fp->formats = badd_formats;
fp->nr_rates = 0; /* SNDRV_PCM_RATE_CONTINUOUS */
fp->rate_min = UAC3_BADD_SAMPLING_RATE;
fp->rate_max = UAC3_BADD_SAMPLING_RATE;
fp->rates = SNDRV_PCM_RATE_CONTINUOUS;
pd = kzalloc(sizeof(*pd), GFP_KERNEL);
if (!pd) {
audioformat_free(fp);
return NULL;
}
pd->pd_id = (stream == SNDRV_PCM_STREAM_PLAYBACK) ?
UAC3_BADD_PD_ID10 : UAC3_BADD_PD_ID11;
pd->pd_d1d0_rec = UAC3_BADD_PD_RECOVER_D1D0;
pd->pd_d2d0_rec = UAC3_BADD_PD_RECOVER_D2D0;
} else {
fp->attributes = parse_uac_endpoint_attributes(chip, alts,
UAC_VERSION_3,
iface_no);
pd = snd_usb_find_power_domain(chip->ctrl_intf,
as->bTerminalLink);
/* ok, let's parse further... */
if (snd_usb_parse_audio_format_v3(chip, fp, as, stream) < 0) {
kfree(pd);
audioformat_free(fp);
return NULL;
}
}
if (pd)
*pd_out = pd;
return fp;
}
static int __snd_usb_parse_audio_interface(struct snd_usb_audio *chip,
int iface_no,
bool *has_non_pcm, bool non_pcm)
{
struct usb_device *dev;
struct usb_interface *iface;
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
int i, altno, err, stream;
struct audioformat *fp = NULL;
struct snd_usb_power_domain *pd = NULL;
bool set_iface_first;
int num, protocol;
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)
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;
switch (protocol) {
default:
dev_dbg(&dev->dev, "%u:%d: unknown interface protocol %#02x, assuming v1\n",
iface_no, altno, protocol);
protocol = UAC_VERSION_1;
fallthrough;
case UAC_VERSION_1:
case UAC_VERSION_2: {
int bm_quirk = 0;
/*
* 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.
*
* Part 1: prepare quirk flag
*/
if (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)
bm_quirk = 1;
fp = snd_usb_get_audioformat_uac12(chip, alts, protocol,
iface_no, i, altno,
stream, bm_quirk);
break;
}
case UAC_VERSION_3:
fp = snd_usb_get_audioformat_uac3(chip, alts, &pd,
iface_no, i, altno, stream);
break;
}
if (!fp)
continue;
else if (IS_ERR(fp))
return PTR_ERR(fp);
if (fp->fmt_type != UAC_FORMAT_TYPE_I)
*has_non_pcm = true;
if ((fp->fmt_type == UAC_FORMAT_TYPE_I) == non_pcm) {
audioformat_free(fp);
kfree(pd);
fp = NULL;
pd = NULL;
continue;
}
snd_usb_audioformat_set_sync_ep(chip, fp);
dev_dbg(&dev->dev, "%u:%d: add audio endpoint %#x\n", iface_no, altno, fp->endpoint);
if (protocol == UAC_VERSION_3)
err = snd_usb_add_audio_stream_v3(chip, stream, fp, pd);
else
err = snd_usb_add_audio_stream(chip, stream, fp);
if (err < 0) {
audioformat_free(fp);
kfree(pd);
return err;
}
/* add endpoints */
err = snd_usb_add_endpoint(chip, fp->endpoint,
SND_USB_ENDPOINT_TYPE_DATA);
if (err < 0)
return err;
if (fp->sync_ep) {
err = snd_usb_add_endpoint(chip, fp->sync_ep,
fp->implicit_fb ?
SND_USB_ENDPOINT_TYPE_DATA :
SND_USB_ENDPOINT_TYPE_SYNC);
if (err < 0)
return err;
}
set_iface_first = false;
if (protocol == UAC_VERSION_1 ||
(chip->quirk_flags & QUIRK_FLAG_SET_IFACE_FIRST))
set_iface_first = true;
/* try to set the interface... */
usb_set_interface(chip->dev, iface_no, 0);
if (set_iface_first)
usb_set_interface(chip->dev, iface_no, altno);
snd_usb_init_pitch(chip, fp);
snd_usb_init_sample_rate(chip, fp, fp->rate_max);
if (!set_iface_first)
usb_set_interface(chip->dev, iface_no, altno);
}
return 0;
}
int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
{
int err;
bool has_non_pcm = false;
/* parse PCM formats */
err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, false);
if (err < 0)
return err;
if (has_non_pcm) {
/* parse non-PCM formats */
err = __snd_usb_parse_audio_interface(chip, iface_no, &has_non_pcm, true);
if (err < 0)
return err;
}
return 0;
}
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