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stream.c
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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"
#include "power.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);
kfree(subs->str_pd);
}
/*
* 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->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;
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;
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->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;
}
}
/* 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) {
kfree(fp->rate_table);
kfree(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);