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61cc2d775e
linux/sound/usb/pcm.c
Takashi Iwai 61cc2d775e ALSA: usb-audio: Fix EP matching for continuous rates 
The function to evaluate the match of the parameters with an EP
assumes only the discrete rate tables and doesn't handle the
continuous rates properly.

This patch fixes match_endpoint_audioformats() to handle the
continuous rates.  Also the almost useless debug prints there are
dropped.

Tested-by: Keith Milner <kamilner@superlative.org>
Tested-by: Dylan Robinson <dylan_robinson@motu.com>
Link: https://lore.kernel.org/r/20201123085347.19667-25-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2020-11-23 15:15:06 +01:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*/
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/bitrev.h>
#include <linux/ratelimit.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/usb/audio-v2.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include "usbaudio.h"
#include "card.h"
#include "quirks.h"
#include "endpoint.h"
#include "helper.h"
#include "pcm.h"
#include "clock.h"
#include "power.h"
#include "media.h"
#define SUBSTREAM_FLAG_DATA_EP_STARTED 0
#define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
/* return the estimated delay based on USB frame counters */
snd_pcm_uframes_t snd_usb_pcm_delay(struct snd_usb_substream *subs,
unsigned int rate)
{
int current_frame_number;
int frame_diff;
int est_delay;
if (!subs->last_delay)
return 0; /* short path */
current_frame_number = usb_get_current_frame_number(subs->dev);
/*
* HCD implementations use different widths, use lower 8 bits.
* The delay will be managed up to 256ms, which is more than
* enough
*/
frame_diff = (current_frame_number - subs->last_frame_number) & 0xff;
/* Approximation based on number of samples per USB frame (ms),
some truncation for 44.1 but the estimate is good enough */
est_delay = frame_diff * rate / 1000;
if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
est_delay = subs->last_delay - est_delay;
else
est_delay = subs->last_delay + est_delay;
if (est_delay < 0)
est_delay = 0;
return est_delay;
}
/*
* return the current pcm pointer. just based on the hwptr_done value.
*/
static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_usb_substream *subs = substream->runtime->private_data;
unsigned int hwptr_done;
if (atomic_read(&subs->stream->chip->shutdown))
return SNDRV_PCM_POS_XRUN;
spin_lock(&subs->lock);
hwptr_done = subs->hwptr_done;
substream->runtime->delay = snd_usb_pcm_delay(subs,
substream->runtime->rate);
spin_unlock(&subs->lock);
return hwptr_done / (substream->runtime->frame_bits >> 3);
}
/*
* find a matching audio format
*/
static struct audioformat *find_format(struct list_head *fmt_list_head,
snd_pcm_format_t format,
unsigned int rate,
unsigned int channels,
struct snd_usb_substream *subs)
{
struct audioformat *fp;
struct audioformat *found = NULL;
int cur_attr = 0, attr;
list_for_each_entry(fp, fmt_list_head, list) {
if (!(fp->formats & pcm_format_to_bits(format)))
continue;
if (fp->channels != channels)
continue;
if (rate < fp->rate_min || rate > fp->rate_max)
continue;
if (!(fp->rates & SNDRV_PCM_RATE_CONTINUOUS)) {
unsigned int i;
for (i = 0; i < fp->nr_rates; i++)
if (fp->rate_table[i] == rate)
break;
if (i >= fp->nr_rates)
continue;
}
attr = fp->ep_attr & USB_ENDPOINT_SYNCTYPE;
if (!found) {
found = fp;
cur_attr = attr;
continue;
}
/* avoid async out and adaptive in if the other method
* supports the same format.
* this is a workaround for the case like
* M-audio audiophile USB.
*/
if (subs && attr != cur_attr) {
if ((attr == USB_ENDPOINT_SYNC_ASYNC &&
subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
(attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
subs->direction == SNDRV_PCM_STREAM_CAPTURE))
continue;
if ((cur_attr == USB_ENDPOINT_SYNC_ASYNC &&
subs->direction == SNDRV_PCM_STREAM_PLAYBACK) ||
(cur_attr == USB_ENDPOINT_SYNC_ADAPTIVE &&
subs->direction == SNDRV_PCM_STREAM_CAPTURE)) {
found = fp;
cur_attr = attr;
continue;
}
}
/* find the format with the largest max. packet size */
if (fp->maxpacksize > found->maxpacksize) {
found = fp;
cur_attr = attr;
}
}
return found;
}
static struct audioformat *find_substream_format(struct snd_usb_substream *subs)
{
return find_format(&subs->fmt_list, subs->pcm_format, subs->cur_rate,
subs->channels, subs);
}
static int init_pitch_v1(struct snd_usb_audio *chip,
struct audioformat *fmt)
{
struct usb_device *dev = chip->dev;
unsigned int ep;
unsigned char data[1];
int err;
ep = fmt->endpoint;
data[0] = 1;
err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
USB_TYPE_CLASS|USB_RECIP_ENDPOINT|USB_DIR_OUT,
UAC_EP_CS_ATTR_PITCH_CONTROL << 8, ep,
data, sizeof(data));
if (err < 0) {
usb_audio_err(chip, "%d:%d: cannot set enable PITCH\n",
fmt->iface, ep);
return err;
}
return 0;
}
static int init_pitch_v2(struct snd_usb_audio *chip,
struct audioformat *fmt)
{
struct usb_device *dev = chip->dev;
unsigned char data[1];
int err;
data[0] = 1;
err = snd_usb_ctl_msg(dev, usb_sndctrlpipe(dev, 0), UAC2_CS_CUR,
USB_TYPE_CLASS | USB_RECIP_ENDPOINT | USB_DIR_OUT,
UAC2_EP_CS_PITCH << 8, 0,
data, sizeof(data));
if (err < 0) {
usb_audio_err(chip, "%d:%d: cannot set enable PITCH (v2)\n",
fmt->iface, fmt->altsetting);
return err;
}
return 0;
}
/*
* initialize the pitch control and sample rate
*/
int snd_usb_init_pitch(struct snd_usb_audio *chip,
struct audioformat *fmt)
{
/* if endpoint doesn't have pitch control, bail out */
if (!(fmt->attributes & UAC_EP_CS_ATTR_PITCH_CONTROL))
return 0;
switch (fmt->protocol) {
case UAC_VERSION_1:
default:
return init_pitch_v1(chip, fmt);
case UAC_VERSION_2:
return init_pitch_v2(chip, fmt);
}
}
static void stop_endpoints(struct snd_usb_substream *subs)
{
if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
snd_usb_endpoint_stop(subs->sync_endpoint);
subs->sync_endpoint->sync_slave = NULL;
}
if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
snd_usb_endpoint_stop(subs->data_endpoint);
}
static int start_endpoints(struct snd_usb_substream *subs)
{
int err;
if (!subs->data_endpoint)
return -EINVAL;
if (!test_and_set_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags)) {
struct snd_usb_endpoint *ep = subs->data_endpoint;
err = snd_usb_endpoint_start(ep);
if (err < 0) {
clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
goto error;
}
}
if (subs->sync_endpoint &&
!test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
struct snd_usb_endpoint *ep = subs->sync_endpoint;
ep->sync_slave = subs->data_endpoint;
err = snd_usb_endpoint_start(ep);
if (err < 0) {
clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
ep->sync_slave = NULL;
goto error;
}
}
return 0;
error:
stop_endpoints(subs);
return err;
}
static void sync_pending_stops(struct snd_usb_substream *subs)
{
snd_usb_endpoint_sync_pending_stop(subs->sync_endpoint);
snd_usb_endpoint_sync_pending_stop(subs->data_endpoint);
}
/* PCM sync_stop callback */
static int snd_usb_pcm_sync_stop(struct snd_pcm_substream *substream)
{
struct snd_usb_substream *subs = substream->runtime->private_data;
if (!snd_usb_lock_shutdown(subs->stream->chip)) {
sync_pending_stops(subs);
snd_usb_unlock_shutdown(subs->stream->chip);
}
return 0;
}
/* Check whether the given iface:altsetting points to an implicit fb source */
static bool search_generic_implicit_fb(struct snd_usb_audio *chip, int ifnum,
unsigned int altsetting,
struct usb_host_interface **altsp,
unsigned int *ep)
{
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
struct usb_endpoint_descriptor *epd;
alts = snd_usb_get_host_interface(chip, ifnum, altsetting);
if (!alts)
return false;
altsd = get_iface_desc(alts);
if (altsd->bInterfaceClass != USB_CLASS_AUDIO ||
altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING ||
altsd->bInterfaceProtocol != UAC_VERSION_2 ||
altsd->bNumEndpoints < 1)
return false;
epd = get_endpoint(alts, 0);
if (!usb_endpoint_is_isoc_in(epd) ||
(epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
USB_ENDPOINT_USAGE_IMPLICIT_FB)
return false;
*ep = epd->bEndpointAddress;
*altsp = alts;
return true;
}
/* Like the function above, but specific to Roland with vendor class and hack */
static bool search_roland_implicit_fb(struct snd_usb_audio *chip, int ifnum,
unsigned int altsetting,
struct usb_host_interface **altsp,
unsigned int *ep)
{
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
struct usb_endpoint_descriptor *epd;
alts = snd_usb_get_host_interface(chip, ifnum, altsetting);
if (!alts)
return false;
altsd = get_iface_desc(alts);
if (altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC ||
(altsd->bInterfaceSubClass != 2 &&
altsd->bInterfaceProtocol != 2) ||
altsd->bNumEndpoints < 1)
return false;
epd = get_endpoint(alts, 0);
if (!usb_endpoint_is_isoc_in(epd) ||
(epd->bmAttributes & USB_ENDPOINT_USAGE_MASK) !=
USB_ENDPOINT_USAGE_IMPLICIT_FB)
return false;
*ep = epd->bEndpointAddress;
*altsp = alts;
return true;
}
/* Setup an implicit feedback endpoint from a quirk. Returns 0 if no quirk
* applies. Returns 1 if a quirk was found.
*/
static int audioformat_implicit_fb_quirk(struct snd_usb_audio *chip,
struct audioformat *fmt,
struct usb_host_interface *alts)
{
struct usb_device *dev = chip->dev;
struct usb_interface_descriptor *altsd = get_iface_desc(alts);
struct usb_interface *iface;
unsigned int attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
unsigned int ep;
unsigned int ifnum;
switch (chip->usb_id) {
case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
case USB_ID(0x0763, 0x2031): /* M-Audio Fast Track C600 */
case USB_ID(0x22f0, 0x0006): /* Allen&Heath Qu-16 */
ep = 0x81;
ifnum = 3;
goto add_sync_ep_from_ifnum;
case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
case USB_ID(0x0763, 0x2081):
ep = 0x81;
ifnum = 2;
goto add_sync_ep_from_ifnum;
case USB_ID(0x2466, 0x8003): /* Fractal Audio Axe-Fx II */
case USB_ID(0x0499, 0x172a): /* Yamaha MODX */
ep = 0x86;
ifnum = 2;
goto add_sync_ep_from_ifnum;
case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx III */
ep = 0x81;
ifnum = 2;
goto add_sync_ep_from_ifnum;
case USB_ID(0x1686, 0xf029): /* Zoom UAC-2 */
ep = 0x82;
ifnum = 2;
goto add_sync_ep_from_ifnum;
case USB_ID(0x1397, 0x0001): /* Behringer UFX1604 */
case USB_ID(0x1397, 0x0002): /* Behringer UFX1204 */
ep = 0x81;
ifnum = 1;
goto add_sync_ep_from_ifnum;
case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II/IIc */
/* MicroBook IIc */
if (altsd->bInterfaceClass == USB_CLASS_AUDIO)
return 0;
/* MicroBook II */
ep = 0x84;
ifnum = 0;
goto add_sync_ep_from_ifnum;
case USB_ID(0x07fd, 0x0008): /* MOTU M Series */
case USB_ID(0x31e9, 0x0001): /* Solid State Logic SSL2 */
case USB_ID(0x31e9, 0x0002): /* Solid State Logic SSL2+ */
case USB_ID(0x0499, 0x172f): /* Steinberg UR22C */
case USB_ID(0x0d9a, 0x00df): /* RTX6001 */
ep = 0x81;
ifnum = 2;
goto add_sync_ep_from_ifnum;
case USB_ID(0x2b73, 0x000a): /* Pioneer DJ DJM-900NXS2 */
case USB_ID(0x2b73, 0x0017): /* Pioneer DJ DJM-250MK2 */
ep = 0x82;
ifnum = 0;
goto add_sync_ep_from_ifnum;
case USB_ID(0x0582, 0x01d8): /* BOSS Katana */
/* BOSS Katana amplifiers do not need quirks */
return 0;
}
/* Generic UAC2 implicit feedback */
if (attr == USB_ENDPOINT_SYNC_ASYNC &&
altsd->bInterfaceClass == USB_CLASS_AUDIO &&
altsd->bInterfaceProtocol == UAC_VERSION_2 &&
altsd->bNumEndpoints == 1) {
ifnum = altsd->bInterfaceNumber + 1;
if (search_generic_implicit_fb(chip, ifnum,
altsd->bAlternateSetting,
&alts, &ep))
goto add_sync_ep;
}
/* Roland/BOSS implicit feedback with vendor spec class */
if (attr == USB_ENDPOINT_SYNC_ASYNC &&
altsd->bInterfaceClass == USB_CLASS_VENDOR_SPEC &&
altsd->bInterfaceProtocol == 2 &&
altsd->bNumEndpoints == 1 &&
USB_ID_VENDOR(chip->usb_id) == 0x0582 /* Roland */) {
ifnum = altsd->bInterfaceNumber + 1;
if (search_roland_implicit_fb(chip, ifnum,
altsd->bAlternateSetting,
&alts, &ep))
goto add_sync_ep;
}
/* No quirk */
return 0;
add_sync_ep_from_ifnum:
iface = usb_ifnum_to_if(dev, ifnum);
if (!iface || iface->num_altsetting < 2)
return 0;
alts = &iface->altsetting[1];
add_sync_ep:
fmt->sync_ep = ep;
fmt->sync_iface = ifnum;
fmt->sync_altsetting = alts->desc.bAlternateSetting;
fmt->implicit_fb = 1;
dev_dbg(&dev->dev, "%d:%d: found implicit_fb sync_ep=%x, iface=%d, alt=%d\n",
fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
fmt->sync_altsetting);
return 1;
}
int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
struct audioformat *fmt)
{
struct usb_device *dev = chip->dev;
struct usb_host_interface *alts;
struct usb_interface_descriptor *altsd;
unsigned int ep, attr, sync_attr;
bool is_playback;
int err;
alts = snd_usb_get_host_interface(chip, fmt->iface, fmt->altsetting);
if (!alts)
return 0;
altsd = get_iface_desc(alts);
is_playback = !(get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN);
if (is_playback) {
err = audioformat_implicit_fb_quirk(chip, fmt, alts);
if (err > 0)
return 0;
}
if (altsd->bNumEndpoints < 2)
return 0;
attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
if ((is_playback && (attr == USB_ENDPOINT_SYNC_SYNC ||
attr == USB_ENDPOINT_SYNC_ADAPTIVE)) ||
(!is_playback && attr != USB_ENDPOINT_SYNC_ADAPTIVE))
return 0;
sync_attr = get_endpoint(alts, 1)->bmAttributes;
/*
* In case of illegal SYNC_NONE for OUT endpoint, we keep going to see
* if we don't find a sync endpoint, as on M-Audio Transit. In case of
* error fall back to SYNC mode and don't create sync endpoint
*/
/* check sync-pipe endpoint */
/* ... and check descriptor size before accessing bSynchAddress
because there is a version of the SB Audigy 2 NX firmware lacking
the audio fields in the endpoint descriptors */
if ((sync_attr & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_ISOC ||
(get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
get_endpoint(alts, 1)->bSynchAddress != 0)) {
dev_err(&dev->dev,
"%d:%d : invalid sync pipe. bmAttributes %02x, bLength %d, bSynchAddress %02x\n",
fmt->iface, fmt->altsetting,
get_endpoint(alts, 1)->bmAttributes,
get_endpoint(alts, 1)->bLength,
get_endpoint(alts, 1)->bSynchAddress);
if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
return 0;
return -EINVAL;
}
ep = get_endpoint(alts, 1)->bEndpointAddress;
if (get_endpoint(alts, 0)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
get_endpoint(alts, 0)->bSynchAddress != 0 &&
((is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress | USB_DIR_IN)) ||
(!is_playback && ep != (unsigned int)(get_endpoint(alts, 0)->bSynchAddress & ~USB_DIR_IN)))) {
dev_err(&dev->dev,
"%d:%d : invalid sync pipe. is_playback %d, ep %02x, bSynchAddress %02x\n",
fmt->iface, fmt->altsetting,
is_playback, ep, get_endpoint(alts, 0)->bSynchAddress);
if (is_playback && attr == USB_ENDPOINT_SYNC_NONE)
return 0;
return -EINVAL;
}
fmt->sync_ep = ep;
fmt->sync_iface = altsd->bInterfaceNumber;
fmt->sync_altsetting = altsd->bAlternateSetting;
if ((sync_attr & USB_ENDPOINT_USAGE_MASK) == USB_ENDPOINT_USAGE_IMPLICIT_FB)
fmt->implicit_fb = 1;
dev_dbg(&dev->dev, "%d:%d: found sync_ep=0x%x, iface=%d, alt=%d, implicit_fb=%d\n",
fmt->iface, fmt->altsetting, fmt->sync_ep, fmt->sync_iface,
fmt->sync_altsetting, fmt->implicit_fb);
return 0;
}
static int set_sync_endpoint(struct snd_usb_substream *subs,
struct audioformat *fmt)
{
struct usb_device *dev = subs->dev;
struct usb_host_interface *alts;
struct snd_usb_audio *chip = subs->stream->chip;
int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
unsigned int ep;
int err;
subs->sync_endpoint = NULL;
subs->data_endpoint->sync_master = NULL;
ep = fmt->sync_ep;
if (!ep)
return 0;
alts = snd_usb_get_host_interface(subs->stream->chip, fmt->sync_iface,
fmt->altsetting);
if (!alts)
return 0;
subs->sync_endpoint = snd_usb_get_endpoint(chip, ep);
if (!subs->sync_endpoint) {
if (is_playback &&
(fmt->ep_attr & USB_ENDPOINT_SYNCTYPE) == USB_ENDPOINT_SYNC_NONE)
return 0;
return -EINVAL;
}
subs->sync_endpoint->iface = fmt->sync_iface;
subs->sync_endpoint->altsetting = fmt->sync_altsetting;
subs->sync_endpoint->is_implicit_feedback = fmt->implicit_fb;
subs->data_endpoint->sync_master = subs->sync_endpoint;
snd_usb_endpoint_set_syncinterval(subs->stream->chip, subs->sync_endpoint, alts);
if (!subs->sync_endpoint->use_count &&
(subs->data_endpoint->iface != subs->sync_endpoint->iface ||
subs->data_endpoint->altsetting != subs->sync_endpoint->altsetting)) {
err = usb_set_interface(subs->dev,
subs->sync_endpoint->iface,
subs->sync_endpoint->altsetting);
if (err < 0)
return err;
dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
subs->sync_endpoint->iface,
subs->sync_endpoint->altsetting);
snd_usb_set_interface_quirk(chip);
}
return 0;
}
/*
* find a matching format and set up the interface
*/
static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
{
struct usb_device *dev = subs->dev;
struct snd_usb_audio *chip = subs->stream->chip;
struct usb_host_interface *alts;
struct usb_interface *iface;
struct snd_usb_endpoint *ep;
int err;
iface = usb_ifnum_to_if(dev, fmt->iface);
if (WARN_ON(!iface))
return -EINVAL;
alts = usb_altnum_to_altsetting(iface, fmt->altsetting);
if (WARN_ON(!alts))
return -EINVAL;
if (fmt == subs->cur_audiofmt && !subs->need_setup_fmt)
return 0;
/* shared EP with implicit fb */
if (fmt->implicit_fb && !subs->need_setup_fmt) {
ep = snd_usb_get_endpoint(chip, fmt->endpoint);
if (ep && ep->use_count > 0)
goto add_data_ep;
}
/* close the old interface */
if (subs->interface >= 0 && (subs->interface != fmt->iface || subs->need_setup_fmt)) {
err = usb_set_interface(subs->dev, subs->interface, 0);
if (err < 0) {
dev_err(&dev->dev,
"%d:%d: return to setting 0 failed (%d)\n",
fmt->iface, fmt->altsetting, err);
return -EIO;
}
subs->interface = -1;
subs->altset_idx = 0;
}
if (subs->need_setup_fmt)
subs->need_setup_fmt = false;
/* set interface */
if (iface->cur_altsetting != alts) {
err = snd_usb_select_mode_quirk(chip, fmt);
if (err < 0)
return -EIO;
err = usb_set_interface(dev, fmt->iface, fmt->altsetting);
if (err < 0) {
dev_err(&dev->dev,
"%d:%d: usb_set_interface failed (%d)\n",
fmt->iface, fmt->altsetting, err);
return -EIO;
}
dev_dbg(&dev->dev, "setting usb interface %d:%d\n",
fmt->iface, fmt->altsetting);
snd_usb_set_interface_quirk(chip);
}
subs->need_setup_ep = true;
add_data_ep:
subs->interface = fmt->iface;
subs->altset_idx = fmt->altset_idx;
subs->data_endpoint = snd_usb_get_endpoint(chip, fmt->endpoint);
if (!subs->data_endpoint)
return -EINVAL;
subs->data_endpoint->iface = fmt->iface;
subs->data_endpoint->altsetting = fmt->altsetting;
err = set_sync_endpoint(subs, fmt);
if (err < 0)
return err;
if (subs->need_setup_ep) {
err = snd_usb_init_pitch(chip, fmt);
if (err < 0)
return err;
}
subs->cur_audiofmt = fmt;
snd_usb_set_format_quirk(subs, fmt);
return 0;
}
/*
* Return the score of matching two audioformats.
* Veto the audioformat if:
* - It has no channels for some reason.
* - Requested PCM format is not supported.
* - Requested sample rate is not supported.
*/
static int match_endpoint_audioformats(struct snd_usb_substream *subs,
struct audioformat *fp,
struct audioformat *match, int rate,
snd_pcm_format_t pcm_format)
{
int i, score;
if (fp->channels < 1)
return 0;
if (!(fp->formats & pcm_format_to_bits(pcm_format)))
return 0;
if (fp->rates & SNDRV_PCM_RATE_CONTINUOUS) {
if (rate < fp->rate_min || rate > fp->rate_max)
return 0;
} else {
for (i = 0; i < fp->nr_rates; i++) {
if (fp->rate_table[i] == rate)
break;
}
if (i >= fp->nr_rates)
return 0;
}
score = 1;
if (fp->channels == match->channels)
score++;
return score;
}
/*
* Configure the sync ep using the rate and pcm format of the data ep.
*/
static int configure_sync_endpoint(struct snd_usb_substream *subs)
{
struct audioformat *fp;
struct audioformat *sync_fp = NULL;
int cur_score = 0;
int sync_period_bytes = subs->period_bytes;
struct snd_usb_substream *sync_subs =
&subs->stream->substream[subs->direction ^ 1];
if (subs->fixed_hw ||
!subs->sync_endpoint->is_implicit_feedback) {
sync_fp = subs->cur_audiofmt;
goto configure;
}
sync_fp = find_format(&sync_subs->fmt_list, subs->pcm_format,
subs->cur_rate, subs->channels, NULL);
if (sync_fp)
goto configure;
/* Try to find the best matching audioformat. */
list_for_each_entry(fp, &sync_subs->fmt_list, list) {
int score = match_endpoint_audioformats(subs,
fp, subs->cur_audiofmt,
subs->cur_rate, subs->pcm_format);
if (score > cur_score) {
sync_fp = fp;
cur_score = score;
}
}
if (unlikely(sync_fp == NULL)) {
dev_err(&subs->dev->dev,
"%s: no valid audioformat for sync ep %x found\n",
__func__, sync_subs->ep_num);
return -EINVAL;
}
/*
* Recalculate the period bytes if channel number differ between
* data and sync ep audioformat.
*/
if (sync_fp->channels != subs->channels) {
sync_period_bytes = (subs->period_bytes / subs->channels) *
sync_fp->channels;
dev_dbg(&subs->dev->dev,
"%s: adjusted sync ep period bytes (%d -> %d)\n",
__func__, subs->period_bytes, sync_period_bytes);
}
configure:
return snd_usb_endpoint_set_params(subs->sync_endpoint,
subs->pcm_format,
sync_fp->channels,
sync_period_bytes,
subs->period_frames,
subs->buffer_periods,
subs->cur_rate,
sync_fp,
NULL);
}
/*
* configure endpoint params
*
* called during initial setup and upon resume
*/
static int configure_endpoint(struct snd_usb_substream *subs)
{
int ret;
/* format changed */
stop_endpoints(subs);
sync_pending_stops(subs);
ret = snd_usb_endpoint_set_params(subs->data_endpoint,
subs->pcm_format,
subs->channels,
subs->period_bytes,
subs->period_frames,
subs->buffer_periods,
subs->cur_rate,
subs->cur_audiofmt,
subs->sync_endpoint);
if (ret < 0)
return ret;
if (subs->sync_endpoint)
ret = configure_sync_endpoint(subs);
return ret;
}
static int snd_usb_pcm_change_state(struct snd_usb_substream *subs, int state)
{
int ret;
if (!subs->str_pd)
return 0;
ret = snd_usb_power_domain_set(subs->stream->chip, subs->str_pd, state);
if (ret < 0) {
dev_err(&subs->dev->dev,
"Cannot change Power Domain ID: %d to state: %d. Err: %d\n",
subs->str_pd->pd_id, state, ret);
return ret;
}
return 0;
}
int snd_usb_pcm_suspend(struct snd_usb_stream *as)
{
int ret;
ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D2);
if (ret < 0)
return ret;
ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D2);
if (ret < 0)
return ret;
return 0;
}
int snd_usb_pcm_resume(struct snd_usb_stream *as)
{
int ret;
ret = snd_usb_pcm_change_state(&as->substream[0], UAC3_PD_STATE_D1);
if (ret < 0)
return ret;
ret = snd_usb_pcm_change_state(&as->substream[1], UAC3_PD_STATE_D1);
if (ret < 0)
return ret;
return 0;
}
/*
* hw_params callback
*
* allocate a buffer and set the given audio format.
*
* so far we use a physically linear buffer although packetize transfer
* doesn't need a continuous area.
* if sg buffer is supported on the later version of alsa, we'll follow
* that.
*/
static int snd_usb_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *hw_params)
{
struct snd_usb_substream *subs = substream->runtime->private_data;
struct audioformat *fmt;
int ret;
ret = snd_media_start_pipeline(subs);
if (ret)
return ret;
subs->pcm_format = params_format(hw_params);
subs->period_bytes = params_period_bytes(hw_params);
subs->period_frames = params_period_size(hw_params);
subs->buffer_periods = params_periods(hw_params);
subs->channels = params_channels(hw_params);
subs->cur_rate = params_rate(hw_params);
fmt = find_substream_format(subs);
if (!fmt) {
dev_dbg(&subs->dev->dev,
"cannot set format: format = %#x, rate = %d, channels = %d\n",
subs->pcm_format, subs->cur_rate, subs->channels);
ret = -EINVAL;
goto stop_pipeline;
}
ret = snd_usb_lock_shutdown(subs->stream->chip);
if (ret < 0)
goto stop_pipeline;
ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
if (ret < 0)
goto unlock;
ret = set_format(subs, fmt);
if (ret < 0)
goto unlock;
unlock:
snd_usb_unlock_shutdown(subs->stream->chip);
if (ret < 0)
goto stop_pipeline;
return ret;
stop_pipeline:
snd_media_stop_pipeline(subs);
return ret;
}
/*
* hw_free callback
*
* reset the audio format and release the buffer
*/
static int snd_usb_hw_free(struct snd_pcm_substream *substream)
{
struct snd_usb_substream *subs = substream->runtime->private_data;
struct snd_usb_audio *chip = subs->stream->chip;
snd_media_stop_pipeline(subs);
subs->cur_audiofmt = NULL;
subs->cur_rate = 0;
subs->period_bytes = 0;
if (!snd_usb_lock_shutdown(chip)) {
stop_endpoints(subs);
sync_pending_stops(subs);
snd_usb_endpoint_deactivate(subs->sync_endpoint);
snd_usb_endpoint_deactivate(subs->data_endpoint);
if (subs->data_endpoint) {
subs->data_endpoint->sync_master = NULL;
subs->data_endpoint = NULL;
}
subs->sync_endpoint = NULL;
snd_usb_unlock_shutdown(chip);
}
return 0;
}
/*
* prepare callback
*
* only a few subtle things...
*/
static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_usb_substream *subs = runtime->private_data;
struct usb_host_interface *alts;
struct usb_interface *iface;
int ret;
if (! subs->cur_audiofmt) {
dev_err(&subs->dev->dev, "no format is specified!\n");
return -ENXIO;
}
ret = snd_usb_lock_shutdown(subs->stream->chip);
if (ret < 0)
return ret;
if (snd_BUG_ON(!subs->data_endpoint)) {
ret = -EIO;
goto unlock;
}
ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D0);
if (ret < 0)
goto unlock;
ret = set_format(subs, subs->cur_audiofmt);
if (ret < 0)
goto unlock;
if (subs->need_setup_ep) {
iface = usb_ifnum_to_if(subs->dev, subs->cur_audiofmt->iface);
alts = &iface->altsetting[subs->cur_audiofmt->altset_idx];
ret = snd_usb_init_sample_rate(subs->stream->chip,
subs->cur_audiofmt,
subs->cur_rate);
if (ret < 0)
goto unlock;
ret = configure_endpoint(subs);
if (ret < 0)
goto unlock;
subs->need_setup_ep = false;
}
/* some unit conversions in runtime */
subs->data_endpoint->maxframesize =
bytes_to_frames(runtime, subs->data_endpoint->maxpacksize);
subs->data_endpoint->curframesize =
bytes_to_frames(runtime, subs->data_endpoint->curpacksize);
/* reset the pointer */
subs->hwptr_done = 0;
subs->transfer_done = 0;
subs->last_delay = 0;
subs->last_frame_number = 0;
runtime->delay = 0;
/* for playback, submit the URBs now; otherwise, the first hwptr_done
* updates for all URBs would happen at the same time when starting */
if (subs->direction == SNDRV_PCM_STREAM_PLAYBACK)
ret = start_endpoints(subs);
unlock:
snd_usb_unlock_shutdown(subs->stream->chip);
return ret;
}
/*
* h/w constraints
*/
#ifdef HW_CONST_DEBUG
#define hwc_debug(fmt, args...) pr_debug(fmt, ##args)
#else
#define hwc_debug(fmt, args...) do { } while(0)
#endif
static const struct snd_pcm_hardware snd_usb_hardware =
{
.info = SNDRV_PCM_INFO_MMAP |
SNDRV_PCM_INFO_MMAP_VALID |
SNDRV_PCM_INFO_BATCH |
SNDRV_PCM_INFO_INTERLEAVED |
SNDRV_PCM_INFO_BLOCK_TRANSFER |
SNDRV_PCM_INFO_PAUSE,
.buffer_bytes_max = 1024 * 1024,
.period_bytes_min = 64,
.period_bytes_max = 512 * 1024,
.periods_min = 2,
.periods_max = 1024,
};
static int hw_check_valid_format(struct snd_usb_substream *subs,
struct snd_pcm_hw_params *params,
struct audioformat *fp)
{
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
struct snd_interval *ct = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
struct snd_mask *fmts = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
struct snd_interval *pt = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
struct snd_mask check_fmts;
unsigned int ptime;
/* check the format */
snd_mask_none(&check_fmts);
check_fmts.bits[0] = (u32)fp->formats;
check_fmts.bits[1] = (u32)(fp->formats >> 32);
snd_mask_intersect(&check_fmts, fmts);
if (snd_mask_empty(&check_fmts)) {
hwc_debug(" > check: no supported format %d\n", fp->format);
return 0;
}
/* check the channels */
if (fp->channels < ct->min || fp->channels > ct->max) {
hwc_debug(" > check: no valid channels %d (%d/%d)\n", fp->channels, ct->min, ct->max);
return 0;
}
/* check the rate is within the range */
if (fp->rate_min > it->max || (fp->rate_min == it->max && it->openmax)) {
hwc_debug(" > check: rate_min %d > max %d\n", fp->rate_min, it->max);
return 0;
}
if (fp->rate_max < it->min || (fp->rate_max == it->min && it->openmin)) {
hwc_debug(" > check: rate_max %d < min %d\n", fp->rate_max, it->min);
return 0;
}
/* check whether the period time is >= the data packet interval */
if (subs->speed != USB_SPEED_FULL) {
ptime = 125 * (1 << fp->datainterval);
if (ptime > pt->max || (ptime == pt->max && pt->openmax)) {
hwc_debug(" > check: ptime %u > max %u\n", ptime, pt->max);
return 0;
}
}
return 1;
}
static int apply_hw_params_minmax(struct snd_interval *it, unsigned int rmin,
unsigned int rmax)
{
int changed;
if (rmin > rmax) {
hwc_debug(" --> get empty\n");
it->empty = 1;
return -EINVAL;
}
changed = 0;
if (it->min < rmin) {
it->min = rmin;
it->openmin = 0;
changed = 1;
}
if (it->max > rmax) {
it->max = rmax;
it->openmax = 0;
changed = 1;
}
if (snd_interval_checkempty(it)) {
it->empty = 1;
return -EINVAL;
}
hwc_debug(" --> (%d, %d) (changed = %d)\n", it->min, it->max, changed);
return changed;
}
static int hw_rule_rate(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
struct audioformat *fp;
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
unsigned int rmin, rmax, r;
int i;
hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
rmin = UINT_MAX;
rmax = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (!hw_check_valid_format(subs, params, fp))
continue;
if (fp->rate_table && fp->nr_rates) {
for (i = 0; i < fp->nr_rates; i++) {
r = fp->rate_table[i];
if (!snd_interval_test(it, r))
continue;
rmin = min(rmin, r);
rmax = max(rmax, r);
}
} else {
rmin = min(rmin, fp->rate_min);
rmax = max(rmax, fp->rate_max);
}
}
return apply_hw_params_minmax(it, rmin, rmax);
}
static int hw_rule_channels(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
struct audioformat *fp;
struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
unsigned int rmin, rmax;
hwc_debug("hw_rule_channels: (%d,%d)\n", it->min, it->max);
rmin = UINT_MAX;
rmax = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (!hw_check_valid_format(subs, params, fp))
continue;
rmin = min(rmin, fp->channels);
rmax = max(rmax, fp->channels);
}
return apply_hw_params_minmax(it, rmin, rmax);
}
static int hw_rule_format(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
struct audioformat *fp;
struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
u64 fbits;
u32 oldbits[2];
int changed;
hwc_debug("hw_rule_format: %x:%x\n", fmt->bits[0], fmt->bits[1]);
fbits = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (!hw_check_valid_format(subs, params, fp))
continue;
fbits |= fp->formats;
}
oldbits[0] = fmt->bits[0];
oldbits[1] = fmt->bits[1];
fmt->bits[0] &= (u32)fbits;
fmt->bits[1] &= (u32)(fbits >> 32);
if (!fmt->bits[0] && !fmt->bits[1]) {
hwc_debug(" --> get empty\n");
return -EINVAL;
}
changed = (oldbits[0] != fmt->bits[0] || oldbits[1] != fmt->bits[1]);
hwc_debug(" --> %x:%x (changed = %d)\n", fmt->bits[0], fmt->bits[1], changed);
return changed;
}
static int hw_rule_period_time(struct snd_pcm_hw_params *params,
struct snd_pcm_hw_rule *rule)
{
struct snd_usb_substream *subs = rule->private;
struct audioformat *fp;
struct snd_interval *it;
unsigned char min_datainterval;
unsigned int pmin;
it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_PERIOD_TIME);
hwc_debug("hw_rule_period_time: (%u,%u)\n", it->min, it->max);
min_datainterval = 0xff;
list_for_each_entry(fp, &subs->fmt_list, list) {
if (!hw_check_valid_format(subs, params, fp))
continue;
min_datainterval = min(min_datainterval, fp->datainterval);
}
if (min_datainterval == 0xff) {
hwc_debug(" --> get empty\n");
it->empty = 1;
return -EINVAL;
}
pmin = 125 * (1 << min_datainterval);
return apply_hw_params_minmax(it, pmin, UINT_MAX);
}
/* apply PCM hw constraints from the concurrent sync EP */
static int apply_hw_constraint_from_sync(struct snd_pcm_runtime *runtime,
struct snd_usb_substream *subs)
{
struct snd_usb_audio *chip = subs->stream->chip;
struct snd_usb_endpoint *ep;
struct audioformat *fp;
int err;
subs->fixed_hw = 0;
list_for_each_entry(fp, &subs->fmt_list, list) {
ep = snd_usb_get_endpoint(chip, fp->endpoint);
if (ep && ep->cur_rate)
goto found;
if (!fp->implicit_fb)
continue;
/* for the implicit fb, check the sync ep as well */
ep = snd_usb_get_endpoint(chip, fp->sync_ep);
if (ep && ep->cur_rate)
goto found;
}
return 0;
found:
if (!find_format(&subs->fmt_list, ep->cur_format, ep->cur_rate,
ep->cur_channels, NULL)) {
usb_audio_dbg(chip, "EP 0x%x being used, but not applicable\n",
ep->ep_num);
return 0;
}
usb_audio_dbg(chip, "EP 0x%x being used, using fixed params:\n",
ep->ep_num);
usb_audio_dbg(chip, "rate=%d, format=%s, channels=%d, period_size=%d, periods=%d\n",
ep->cur_rate, snd_pcm_format_name(ep->cur_format),
ep->cur_channels, ep->cur_period_frames,
ep->cur_buffer_periods);
runtime->hw.formats = pcm_format_to_bits(ep->cur_format);
runtime->hw.rate_min = runtime->hw.rate_max = ep->cur_rate;
runtime->hw.channels_min = runtime->hw.channels_max =
ep->cur_channels;
runtime->hw.rates = SNDRV_PCM_RATE_KNOT;
runtime->hw.periods_min = runtime->hw.periods_max =
ep->cur_buffer_periods;
subs->fixed_hw = 1;
err = snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
ep->cur_period_frames,
ep->cur_period_frames);
if (err < 0)
return err;
return 1; /* notify the finding */
}
/*
* set up the runtime hardware information.
*/
static int setup_hw_info(struct snd_pcm_runtime *runtime, struct snd_usb_substream *subs)
{
struct snd_usb_audio *chip = subs->stream->chip;
struct audioformat *fp;
unsigned int pt, ptmin;
int param_period_time_if_needed = -1;
int err;
mutex_lock(&chip->mutex);
err = apply_hw_constraint_from_sync(runtime, subs);
mutex_unlock(&chip->mutex);
if (err < 0)
return err;
if (err > 0) /* found the matching? */
goto add_extra_rules;
runtime->hw.formats = subs->formats;
runtime->hw.rate_min = 0x7fffffff;
runtime->hw.rate_max = 0;
runtime->hw.channels_min = 256;
runtime->hw.channels_max = 0;
runtime->hw.rates = 0;
ptmin = UINT_MAX;
/* check min/max rates and channels */
list_for_each_entry(fp, &subs->fmt_list, list) {
runtime->hw.rates |= fp->rates;
if (runtime->hw.rate_min > fp->rate_min)
runtime->hw.rate_min = fp->rate_min;
if (runtime->hw.rate_max < fp->rate_max)
runtime->hw.rate_max = fp->rate_max;
if (runtime->hw.channels_min > fp->channels)
runtime->hw.channels_min = fp->channels;
if (runtime->hw.channels_max < fp->channels)
runtime->hw.channels_max = fp->channels;
if (fp->fmt_type == UAC_FORMAT_TYPE_II && fp->frame_size > 0) {
/* FIXME: there might be more than one audio formats... */
runtime->hw.period_bytes_min = runtime->hw.period_bytes_max =
fp->frame_size;
}
pt = 125 * (1 << fp->datainterval);
ptmin = min(ptmin, pt);
}
param_period_time_if_needed = SNDRV_PCM_HW_PARAM_PERIOD_TIME;
if (subs->speed == USB_SPEED_FULL)
/* full speed devices have fixed data packet interval */
ptmin = 1000;
if (ptmin == 1000)
/* if period time doesn't go below 1 ms, no rules needed */
param_period_time_if_needed = -1;
err = snd_pcm_hw_constraint_minmax(runtime,
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
ptmin, UINT_MAX);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
hw_rule_rate, subs,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_CHANNELS,
param_period_time_if_needed,
-1);
if (err < 0)
return err;
add_extra_rules:
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
hw_rule_channels, subs,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_RATE,
param_period_time_if_needed,
-1);
if (err < 0)
return err;
err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
hw_rule_format, subs,
SNDRV_PCM_HW_PARAM_RATE,
SNDRV_PCM_HW_PARAM_CHANNELS,
param_period_time_if_needed,
-1);
if (err < 0)
return err;
if (param_period_time_if_needed >= 0) {
err = snd_pcm_hw_rule_add(runtime, 0,
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
hw_rule_period_time, subs,
SNDRV_PCM_HW_PARAM_FORMAT,
SNDRV_PCM_HW_PARAM_CHANNELS,
SNDRV_PCM_HW_PARAM_RATE,
-1);
if (err < 0)
return err;
}
return 0;
}
static int snd_usb_pcm_open(struct snd_pcm_substream *substream)
{
int direction = substream->stream;
struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct snd_usb_substream *subs = &as->substream[direction];
int ret;
subs->interface = -1;
subs->altset_idx = 0;
runtime->hw = snd_usb_hardware;
runtime->private_data = subs;
subs->pcm_substream = substream;
/* runtime PM is also done there */
/* initialize DSD/DOP context */
subs->dsd_dop.byte_idx = 0;
subs->dsd_dop.channel = 0;
subs->dsd_dop.marker = 1;
ret = setup_hw_info(runtime, subs);
if (ret < 0)
return ret;
ret = snd_usb_autoresume(subs->stream->chip);
if (ret < 0)
return ret;
ret = snd_media_stream_init(subs, as->pcm, direction);
if (ret < 0)
snd_usb_autosuspend(subs->stream->chip);
return ret;
}
static int snd_usb_pcm_close(struct snd_pcm_substream *substream)
{
int direction = substream->stream;
struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
struct snd_usb_substream *subs = &as->substream[direction];
int ret;
snd_media_stop_pipeline(subs);
if (subs->interface >= 0 &&
!snd_usb_lock_shutdown(subs->stream->chip)) {
usb_set_interface(subs->dev, subs->interface, 0);
subs->interface = -1;
ret = snd_usb_pcm_change_state(subs, UAC3_PD_STATE_D1);
snd_usb_unlock_shutdown(subs->stream->chip);
if (ret < 0)
return ret;
}
subs->pcm_substream = NULL;
snd_usb_autosuspend(subs->stream->chip);
return 0;
}
/* Since a URB can handle only a single linear buffer, we must use double
* buffering when the data to be transferred overflows the buffer boundary.
* To avoid inconsistencies when updating hwptr_done, we use double buffering
* for all URBs.
*/
static void retire_capture_urb(struct snd_usb_substream *subs,
struct urb *urb)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
unsigned int stride, frames, bytes, oldptr;
int i, period_elapsed = 0;
unsigned long flags;
unsigned char *cp;
int current_frame_number;
/* read frame number here, update pointer in critical section */
current_frame_number = usb_get_current_frame_number(subs->dev);
stride = runtime->frame_bits >> 3;
for (i = 0; i < urb->number_of_packets; i++) {
cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset + subs->pkt_offset_adj;
if (urb->iso_frame_desc[i].status && printk_ratelimit()) {
dev_dbg(&subs->dev->dev, "frame %d active: %d\n",
i, urb->iso_frame_desc[i].status);
// continue;
}
bytes = urb->iso_frame_desc[i].actual_length;
if (subs->stream_offset_adj > 0) {
unsigned int adj = min(subs->stream_offset_adj, bytes);
cp += adj;
bytes -= adj;
subs->stream_offset_adj -= adj;
}
frames = bytes / stride;
if (!subs->txfr_quirk)
bytes = frames * stride;
if (bytes % (runtime->sample_bits >> 3) != 0) {
int oldbytes = bytes;
bytes = frames * stride;
dev_warn_ratelimited(&subs->dev->dev,
"Corrected urb data len. %d->%d\n",
oldbytes, bytes);
}
/* update the current pointer */
spin_lock_irqsave(&subs->lock, flags);
oldptr = subs->hwptr_done;
subs->hwptr_done += bytes;
if (subs->hwptr_done >= runtime->buffer_size * stride)
subs->hwptr_done -= runtime->buffer_size * stride;
frames = (bytes + (oldptr % stride)) / stride;
subs->transfer_done += frames;
if (subs->transfer_done >= runtime->period_size) {
subs->transfer_done -= runtime->period_size;
period_elapsed = 1;
}
/* capture delay is by construction limited to one URB,
* reset delays here
*/
runtime->delay = subs->last_delay = 0;
/* realign last_frame_number */
subs->last_frame_number = current_frame_number;
subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
spin_unlock_irqrestore(&subs->lock, flags);
/* copy a data chunk */
if (oldptr + bytes > runtime->buffer_size * stride) {
unsigned int bytes1 =
runtime->buffer_size * stride - oldptr;
memcpy(runtime->dma_area + oldptr, cp, bytes1);
memcpy(runtime->dma_area, cp + bytes1, bytes - bytes1);
} else {
memcpy(runtime->dma_area + oldptr, cp, bytes);
}
}
if (period_elapsed)
snd_pcm_period_elapsed(subs->pcm_substream);
}
static inline void fill_playback_urb_dsd_dop(struct snd_usb_substream *subs,
struct urb *urb, unsigned int bytes)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
unsigned int stride = runtime->frame_bits >> 3;
unsigned int dst_idx = 0;
unsigned int src_idx = subs->hwptr_done;
unsigned int wrap = runtime->buffer_size * stride;
u8 *dst = urb->transfer_buffer;
u8 *src = runtime->dma_area;
u8 marker[] = { 0x05, 0xfa };
/*
* The DSP DOP format defines a way to transport DSD samples over
* normal PCM data endpoints. It requires stuffing of marker bytes
* (0x05 and 0xfa, alternating per sample frame), and then expects
* 2 additional bytes of actual payload. The whole frame is stored
* LSB.
*
* Hence, for a stereo transport, the buffer layout looks like this,
* where L refers to left channel samples and R to right.
*
* L1 L2 0x05 R1 R2 0x05 L3 L4 0xfa R3 R4 0xfa
* L5 L6 0x05 R5 R6 0x05 L7 L8 0xfa R7 R8 0xfa
* .....
*
*/
while (bytes--) {
if (++subs->dsd_dop.byte_idx == 3) {
/* frame boundary? */
dst[dst_idx++] = marker[subs->dsd_dop.marker];
src_idx += 2;
subs->dsd_dop.byte_idx = 0;
if (++subs->dsd_dop.channel % runtime->channels == 0) {
/* alternate the marker */
subs->dsd_dop.marker++;
subs->dsd_dop.marker %= ARRAY_SIZE(marker);
subs->dsd_dop.channel = 0;
}
} else {
/* stuff the DSD payload */
int idx = (src_idx + subs->dsd_dop.byte_idx - 1) % wrap;
if (subs->cur_audiofmt->dsd_bitrev)
dst[dst_idx++] = bitrev8(src[idx]);
else
dst[dst_idx++] = src[idx];
subs->hwptr_done++;
}
}
if (subs->hwptr_done >= runtime->buffer_size * stride)
subs->hwptr_done -= runtime->buffer_size * stride;
}
static void copy_to_urb(struct snd_usb_substream *subs, struct urb *urb,
int offset, int stride, unsigned int bytes)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
if (subs->hwptr_done + bytes > runtime->buffer_size * stride) {
/* err, the transferred area goes over buffer boundary. */
unsigned int bytes1 =
runtime->buffer_size * stride - subs->hwptr_done;
memcpy(urb->transfer_buffer + offset,
runtime->dma_area + subs->hwptr_done, bytes1);
memcpy(urb->transfer_buffer + offset + bytes1,
runtime->dma_area, bytes - bytes1);
} else {
memcpy(urb->transfer_buffer + offset,
runtime->dma_area + subs->hwptr_done, bytes);
}
subs->hwptr_done += bytes;
if (subs->hwptr_done >= runtime->buffer_size * stride)
subs->hwptr_done -= runtime->buffer_size * stride;
}
static unsigned int copy_to_urb_quirk(struct snd_usb_substream *subs,
struct urb *urb, int stride,
unsigned int bytes)
{
__le32 packet_length;
int i;
/* Put __le32 length descriptor at start of each packet. */
for (i = 0; i < urb->number_of_packets; i++) {
unsigned int length = urb->iso_frame_desc[i].length;
unsigned int offset = urb->iso_frame_desc[i].offset;
packet_length = cpu_to_le32(length);
offset += i * sizeof(packet_length);
urb->iso_frame_desc[i].offset = offset;
urb->iso_frame_desc[i].length += sizeof(packet_length);
memcpy(urb->transfer_buffer + offset,
&packet_length, sizeof(packet_length));
copy_to_urb(subs, urb, offset + sizeof(packet_length),
stride, length);
}
/* Adjust transfer size accordingly. */
bytes += urb->number_of_packets * sizeof(packet_length);
return bytes;
}
static void prepare_playback_urb(struct snd_usb_substream *subs,
struct urb *urb)
{
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
struct snd_usb_endpoint *ep = subs->data_endpoint;
struct snd_urb_ctx *ctx = urb->context;
unsigned int counts, frames, bytes;
int i, stride, period_elapsed = 0;
unsigned long flags;
stride = runtime->frame_bits >> 3;
frames = 0;
urb->number_of_packets = 0;
spin_lock_irqsave(&subs->lock, flags);
subs->frame_limit += ep->max_urb_frames;
for (i = 0; i < ctx->packets; i++) {
if (ctx->packet_size[i])
counts = ctx->packet_size[i];
else if (ep->sync_master)
counts = snd_usb_endpoint_slave_next_packet_size(ep);
else
counts = snd_usb_endpoint_next_packet_size(ep);
/* set up descriptor */
urb->iso_frame_desc[i].offset = frames * ep->stride;
urb->iso_frame_desc[i].length = counts * ep->stride;
frames += counts;
urb->number_of_packets++;
subs->transfer_done += counts;
if (subs->transfer_done >= runtime->period_size) {
subs->transfer_done -= runtime->period_size;
subs->frame_limit = 0;
period_elapsed = 1;
if (subs->fmt_type == UAC_FORMAT_TYPE_II) {
if (subs->transfer_done > 0) {
/* FIXME: fill-max mode is not
* supported yet */
frames -= subs->transfer_done;
counts -= subs->transfer_done;
urb->iso_frame_desc[i].length =
counts * ep->stride;
subs->transfer_done = 0;
}
i++;
if (i < ctx->packets) {
/* add a transfer delimiter */
urb->iso_frame_desc[i].offset =
frames * ep->stride;
urb->iso_frame_desc[i].length = 0;
urb->number_of_packets++;
}
break;
}
}
/* finish at the period boundary or after enough frames */
if ((period_elapsed ||
subs->transfer_done >= subs->frame_limit) &&
!snd_usb_endpoint_implicit_feedback_sink(ep))
break;
}
bytes = frames * ep->stride;
if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE &&
subs->cur_audiofmt->dsd_dop)) {
fill_playback_urb_dsd_dop(subs, urb, bytes);
} else if (unlikely(subs->pcm_format == SNDRV_PCM_FORMAT_DSD_U8 &&
subs->cur_audiofmt->dsd_bitrev)) {
/* bit-reverse the bytes */
u8 *buf = urb->transfer_buffer;
for (i = 0; i < bytes; i++) {
int idx = (subs->hwptr_done + i)
% (runtime->buffer_size * stride);
buf[i] = bitrev8(runtime->dma_area[idx]);
}
subs->hwptr_done += bytes;
if (subs->hwptr_done >= runtime->buffer_size * stride)
subs->hwptr_done -= runtime->buffer_size * stride;
} else {
/* usual PCM */
if (!subs->tx_length_quirk)
copy_to_urb(subs, urb, 0, stride, bytes);
else
bytes = copy_to_urb_quirk(subs, urb, stride, bytes);
/* bytes is now amount of outgoing data */
}
/* update delay with exact number of samples queued */
runtime->delay = subs->last_delay;
runtime->delay += frames;
subs->last_delay = runtime->delay;
/* realign last_frame_number */
subs->last_frame_number = usb_get_current_frame_number(subs->dev);
subs->last_frame_number &= 0xFF; /* keep 8 LSBs */
if (subs->trigger_tstamp_pending_update) {
/* this is the first actual URB submitted,
* update trigger timestamp to reflect actual start time
*/
snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
subs->trigger_tstamp_pending_update = false;
}
spin_unlock_irqrestore(&subs->lock, flags);
urb->transfer_buffer_length = bytes;
if (period_elapsed)
snd_pcm_period_elapsed(subs->pcm_substream);
}
/*
* process after playback data complete
* - decrease the delay count again
*/
static void retire_playback_urb(struct snd_usb_substream *subs,
struct urb *urb)
{
unsigned long flags;
struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
struct snd_usb_endpoint *ep = subs->data_endpoint;
int processed = urb->transfer_buffer_length / ep->stride;
int est_delay;
/* ignore the delay accounting when processed=0 is given, i.e.
* silent payloads are processed before handling the actual data
*/
if (!processed)
return;
spin_lock_irqsave(&subs->lock, flags);
if (!subs->last_delay)
goto out; /* short path */
est_delay = snd_usb_pcm_delay(subs, runtime->rate);
/* update delay with exact number of samples played */
if (processed > subs->last_delay)
subs->last_delay = 0;
else
subs->last_delay -= processed;
runtime->delay = subs->last_delay;
/*
* Report when delay estimate is off by more than 2ms.
* The error should be lower than 2ms since the estimate relies
* on two reads of a counter updated every ms.
*/
if (abs(est_delay - subs->last_delay) * 1000 > runtime->rate * 2)
dev_dbg_ratelimited(&subs->dev->dev,
"delay: estimated %d, actual %d\n",
est_delay, subs->last_delay);
if (!subs->running) {
/* update last_frame_number for delay counting here since
* prepare_playback_urb won't be called during pause
*/
subs->last_frame_number =
usb_get_current_frame_number(subs->dev) & 0xff;
}
out:
spin_unlock_irqrestore(&subs->lock, flags);
}
static int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream,
int cmd)
{
struct snd_usb_substream *subs = substream->runtime->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
subs->trigger_tstamp_pending_update = true;
fallthrough;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
snd_usb_endpoint_set_callback(subs->data_endpoint,
prepare_playback_urb,
retire_playback_urb,
subs);
subs->running = 1;
return 0;
case SNDRV_PCM_TRIGGER_SUSPEND:
subs->need_setup_fmt = true;
fallthrough;
case SNDRV_PCM_TRIGGER_STOP:
stop_endpoints(subs);
snd_usb_endpoint_set_callback(subs->data_endpoint,
NULL, NULL, NULL);
subs->running = 0;
return 0;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
/* keep retire_data_urb for delay calculation */
snd_usb_endpoint_set_callback(subs->data_endpoint,
NULL,
retire_playback_urb,
subs);
subs->running = 0;
return 0;
}
return -EINVAL;
}
static int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream,
int cmd)
{
int err;
struct snd_usb_substream *subs = substream->runtime->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
err = start_endpoints(subs);
if (err < 0)
return err;
fallthrough;
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
snd_usb_endpoint_set_callback(subs->data_endpoint,
NULL, retire_capture_urb,
subs);
subs->running = 1;
return 0;
case SNDRV_PCM_TRIGGER_SUSPEND:
subs->need_setup_fmt = true;
fallthrough;
case SNDRV_PCM_TRIGGER_STOP:
stop_endpoints(subs);
fallthrough;
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
snd_usb_endpoint_set_callback(subs->data_endpoint,
NULL, NULL, NULL);
subs->running = 0;
return 0;
}
return -EINVAL;
}
static const struct snd_pcm_ops snd_usb_playback_ops = {
.open = snd_usb_pcm_open,
.close = snd_usb_pcm_close,
.hw_params = snd_usb_hw_params,
.hw_free = snd_usb_hw_free,
.prepare = snd_usb_pcm_prepare,
.trigger = snd_usb_substream_playback_trigger,
.sync_stop = snd_usb_pcm_sync_stop,
.pointer = snd_usb_pcm_pointer,
};
static const struct snd_pcm_ops snd_usb_capture_ops = {
.open = snd_usb_pcm_open,
.close = snd_usb_pcm_close,
.hw_params = snd_usb_hw_params,
.hw_free = snd_usb_hw_free,
.prepare = snd_usb_pcm_prepare,
.trigger = snd_usb_substream_capture_trigger,
.sync_stop = snd_usb_pcm_sync_stop,
.pointer = snd_usb_pcm_pointer,
};
void snd_usb_set_pcm_ops(struct snd_pcm *pcm, int stream)
{
const struct snd_pcm_ops *ops;
ops = stream == SNDRV_PCM_STREAM_PLAYBACK ?
&snd_usb_playback_ops : &snd_usb_capture_ops;
snd_pcm_set_ops(pcm, stream, ops);
}
void snd_usb_preallocate_buffer(struct snd_usb_substream *subs)
{
struct snd_pcm *pcm = subs->stream->pcm;
struct snd_pcm_substream *s = pcm->streams[subs->direction].substream;
struct device *dev = subs->dev->bus->controller;
if (snd_usb_use_vmalloc)
snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_VMALLOC,
NULL, 0, 0);
else
snd_pcm_set_managed_buffer(s, SNDRV_DMA_TYPE_DEV_SG,
dev, 64*1024, 512*1024);
}
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