[alsa-devel] [PATCH 3/6] ALSA: snd-usb: switch over to new endpoint streaming logic
Daniel Mack
zonque at gmail.com
Fri Dec 23 17:15:44 CET 2011
With the previous commit that added the new streaming model, all
endpoint and streaming related code is now in endpoint.c, and pcm.c
only acts as a wrapper for handling the packet's payload.
Signed-off-by: Daniel Mack <zonque at gmail.com>
---
sound/usb/card.c | 8 +-
sound/usb/card.h | 4 +
sound/usb/endpoint.c | 40 -----
sound/usb/endpoint.h | 3 -
sound/usb/pcm.c | 417 +++++++++++++++++++++++++++++++++++++++++---------
sound/usb/stream.c | 31 ++++-
6 files changed, 384 insertions(+), 119 deletions(-)
diff --git a/sound/usb/card.c b/sound/usb/card.c
index 6bc88b7..d5b5c33 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -131,8 +131,9 @@ static void snd_usb_stream_disconnect(struct list_head *head)
subs = &as->substream[idx];
if (!subs->num_formats)
continue;
- snd_usb_release_substream_urbs(subs, 1);
subs->interface = -1;
+ subs->data_endpoint = NULL;
+ subs->sync_endpoint = NULL;
}
}
@@ -350,6 +351,7 @@ static int snd_usb_audio_create(struct usb_device *dev, int idx,
chip->usb_id = USB_ID(le16_to_cpu(dev->descriptor.idVendor),
le16_to_cpu(dev->descriptor.idProduct));
INIT_LIST_HEAD(&chip->pcm_list);
+ INIT_LIST_HEAD(&chip->ep_list);
INIT_LIST_HEAD(&chip->midi_list);
INIT_LIST_HEAD(&chip->mixer_list);
@@ -567,6 +569,10 @@ static void snd_usb_audio_disconnect(struct usb_device *dev,
list_for_each(p, &chip->pcm_list) {
snd_usb_stream_disconnect(p);
}
+ /* release the endpoint resources */
+ list_for_each(p, &chip->ep_list) {
+ snd_usb_endpoint_free(p);
+ }
/* release the midi resources */
list_for_each(p, &chip->midi_list) {
snd_usbmidi_disconnect(p);
diff --git a/sound/usb/card.h b/sound/usb/card.h
index 92228f1..90681f7 100644
--- a/sound/usb/card.h
+++ b/sound/usb/card.h
@@ -144,6 +144,10 @@ struct snd_usb_substream {
struct snd_urb_ctx syncurb[SYNC_URBS]; /* sync urb table */
char *syncbuf; /* sync buffer for all sync URBs */
dma_addr_t sync_dma; /* DMA address of syncbuf */
+ /* data and sync endpoints for this stream */
+ struct snd_usb_endpoint *data_endpoint;
+ struct snd_usb_endpoint *sync_endpoint;
+ unsigned long flags;
u64 formats; /* format bitmasks (all or'ed) */
unsigned int num_formats; /* number of supported audio formats (list) */
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index eb47466..93d6590 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -911,46 +911,6 @@ void snd_usb_init_substream(struct snd_usb_stream *as,
subs->fmt_type = fp->fmt_type;
}
-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:
- case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- subs->ops.prepare = prepare_playback_urb;
- return 0;
- case SNDRV_PCM_TRIGGER_STOP:
- return deactivate_urbs_old(subs, 0, 0);
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- subs->ops.prepare = prepare_nodata_playback_urb;
- return 0;
- }
-
- return -EINVAL;
-}
-
-int snd_usb_substream_capture_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->ops.retire = retire_capture_urb;
- return start_urbs(subs, substream->runtime);
- case SNDRV_PCM_TRIGGER_STOP:
- return deactivate_urbs_old(subs, 0, 0);
- case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
- subs->ops.retire = retire_paused_capture_urb;
- return 0;
- case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
- subs->ops.retire = retire_capture_urb;
- return 0;
- }
-
- return -EINVAL;
-}
-
int snd_usb_substream_prepare(struct snd_usb_substream *subs,
struct snd_pcm_runtime *runtime)
{
diff --git a/sound/usb/endpoint.h b/sound/usb/endpoint.h
index 9f083d7..e540768 100644
--- a/sound/usb/endpoint.h
+++ b/sound/usb/endpoint.h
@@ -15,9 +15,6 @@ void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force);
int snd_usb_substream_prepare(struct snd_usb_substream *subs,
struct snd_pcm_runtime *runtime);
-int snd_usb_substream_playback_trigger(struct snd_pcm_substream *substream, int cmd);
-int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd);
-
#define SND_USB_ENDPOINT_TYPE_DATA 0
#define SND_USB_ENDPOINT_TYPE_SYNC 1
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 0220b0f..271579c 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -34,6 +34,9 @@
#include "clock.h"
#include "power.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)
@@ -208,6 +211,84 @@ int snd_usb_init_pitch(struct snd_usb_audio *chip, int iface,
}
}
+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;
+
+ snd_printdd(KERN_DEBUG "Starting data EP @%p\n", ep);
+
+ ep->data_subs = subs;
+ err = snd_usb_endpoint_start(ep);
+ if (err < 0) {
+ clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags);
+ return err;
+ }
+ }
+
+ if (subs->sync_endpoint &&
+ !test_and_set_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags)) {
+ struct snd_usb_endpoint *ep = subs->sync_endpoint;
+
+ snd_printdd(KERN_DEBUG "Starting sync EP @%p\n", ep);
+
+ ep->sync_slave = subs->data_endpoint;
+ err = snd_usb_endpoint_start(ep);
+ if (err < 0) {
+ clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static void stop_endpoints(struct snd_usb_substream *subs,
+ int force, int can_sleep, int wait)
+{
+ if (test_and_clear_bit(SUBSTREAM_FLAG_SYNC_EP_STARTED, &subs->flags))
+ snd_usb_endpoint_stop(subs->sync_endpoint,
+ force, can_sleep, wait);
+
+ if (test_and_clear_bit(SUBSTREAM_FLAG_DATA_EP_STARTED, &subs->flags))
+ snd_usb_endpoint_stop(subs->data_endpoint,
+ force, can_sleep, wait);
+}
+
+static int activate_endpoints(struct snd_usb_substream *subs)
+{
+ if (subs->sync_endpoint) {
+ int ret;
+
+ ret = snd_usb_endpoint_activate(subs->sync_endpoint);
+ if (ret < 0)
+ return ret;
+ }
+
+ return snd_usb_endpoint_activate(subs->data_endpoint);
+}
+
+static int deactivate_endpoints(struct snd_usb_substream *subs)
+{
+ int reta, retb;
+
+ reta = snd_usb_endpoint_deactivate(subs->sync_endpoint);
+ retb = snd_usb_endpoint_deactivate(subs->data_endpoint);
+
+ if (reta < 0)
+ return reta;
+
+ if (retb < 0)
+ return retb;
+
+ return 0;
+}
+
/*
* find a matching format and set up the interface
*/
@@ -232,40 +313,11 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
if (fmt == subs->cur_audiofmt)
return 0;
- /* close the old interface */
- if (subs->interface >= 0 && subs->interface != fmt->iface) {
- if (usb_set_interface(subs->dev, subs->interface, 0) < 0) {
- snd_printk(KERN_ERR "%d:%d:%d: return to setting 0 failed\n",
- dev->devnum, fmt->iface, fmt->altsetting);
- return -EIO;
- }
- subs->interface = -1;
- subs->altset_idx = 0;
- }
-
- /* set interface */
- if (subs->interface != fmt->iface || subs->altset_idx != fmt->altset_idx) {
- if (usb_set_interface(dev, fmt->iface, fmt->altsetting) < 0) {
- snd_printk(KERN_ERR "%d:%d:%d: usb_set_interface failed\n",
- dev->devnum, fmt->iface, fmt->altsetting);
- return -EIO;
- }
- snd_printdd(KERN_INFO "setting usb interface %d:%d\n", fmt->iface, fmt->altsetting);
- subs->interface = fmt->iface;
- subs->altset_idx = fmt->altset_idx;
- }
-
- /* create a data pipe */
- ep = fmt->endpoint & USB_ENDPOINT_NUMBER_MASK;
- if (is_playback)
- subs->datapipe = usb_sndisocpipe(dev, ep);
- else
- subs->datapipe = usb_rcvisocpipe(dev, ep);
- subs->datainterval = fmt->datainterval;
- subs->syncpipe = subs->syncinterval = 0;
- subs->maxpacksize = fmt->maxpacksize;
- subs->syncmaxsize = 0;
- subs->fill_max = 0;
+ subs->data_endpoint = snd_usb_add_endpoint(subs->stream->chip,
+ alts, fmt->endpoint, subs->direction,
+ SND_USB_ENDPOINT_TYPE_DATA);
+ if (!subs->data_endpoint)
+ return -EINVAL;
/* we need a sync pipe in async OUT or adaptive IN mode */
/* check the number of EP, since some devices have broken
@@ -276,6 +328,15 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||
(! is_playback && attr == USB_ENDPOINT_SYNC_ADAPTIVE)) &&
altsd->bNumEndpoints >= 2) {
+ switch (subs->stream->chip->usb_id) {
+ case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
+ case USB_ID(0x0763, 0x2081):
+ ep = 0x81;
+ iface = usb_ifnum_to_if(dev, 2);
+ alts = &iface->altsetting[1];
+ goto add_sync_ep;
+ }
+
/* check sync-pipe endpoint */
/* ... and check descriptor size before accessing bSynchAddress
because there is a version of the SB Audigy 2 NX firmware lacking
@@ -295,28 +356,16 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
dev->devnum, fmt->iface, fmt->altsetting);
return -EINVAL;
}
- ep &= USB_ENDPOINT_NUMBER_MASK;
- if (is_playback)
- subs->syncpipe = usb_rcvisocpipe(dev, ep);
- else
- subs->syncpipe = usb_sndisocpipe(dev, ep);
- if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
- get_endpoint(alts, 1)->bRefresh >= 1 &&
- get_endpoint(alts, 1)->bRefresh <= 9)
- subs->syncinterval = get_endpoint(alts, 1)->bRefresh;
- else if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
- subs->syncinterval = 1;
- else if (get_endpoint(alts, 1)->bInterval >= 1 &&
- get_endpoint(alts, 1)->bInterval <= 16)
- subs->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
- else
- subs->syncinterval = 3;
- subs->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
- }
-
- /* always fill max packet size */
- if (fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX)
- subs->fill_max = 1;
+add_sync_ep:
+ subs->sync_endpoint = snd_usb_add_endpoint(subs->stream->chip,
+ alts, ep, !subs->direction,
+ SND_USB_ENDPOINT_TYPE_SYNC);
+
+ if (!subs->sync_endpoint)
+ return -EINVAL;
+
+ subs->data_endpoint->sync_master = subs->sync_endpoint;
+ }
if ((err = snd_usb_init_pitch(subs->stream->chip, subs->interface, alts, fmt)) < 0)
return err;
@@ -390,12 +439,22 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
if (changed) {
mutex_lock(&subs->stream->chip->shutdown_mutex);
/* format changed */
- snd_usb_release_substream_urbs(subs, 0);
- /* influenced: period_bytes, channels, rate, format, */
- ret = snd_usb_init_substream_urbs(subs, params_period_bytes(hw_params),
- params_rate(hw_params),
- snd_pcm_format_physical_width(params_format(hw_params)) *
- params_channels(hw_params));
+ stop_endpoints(subs, 0, 0, 0);
+ deactivate_endpoints(subs);
+
+ ret = activate_endpoints(subs);
+ if (ret < 0)
+ goto unlock;
+
+ ret = snd_usb_endpoint_set_params(subs->data_endpoint, hw_params, fmt,
+ subs->sync_endpoint);
+ if (ret < 0)
+ goto unlock;
+
+ if (subs->sync_endpoint)
+ ret = snd_usb_endpoint_set_params(subs->sync_endpoint,
+ hw_params, fmt, NULL);
+unlock:
mutex_unlock(&subs->stream->chip->shutdown_mutex);
}
@@ -415,7 +474,7 @@ static int snd_usb_hw_free(struct snd_pcm_substream *substream)
subs->cur_rate = 0;
subs->period_bytes = 0;
mutex_lock(&subs->stream->chip->shutdown_mutex);
- snd_usb_release_substream_urbs(subs, 0);
+ stop_endpoints(subs, 0, 1, 1);
mutex_unlock(&subs->stream->chip->shutdown_mutex);
return snd_pcm_lib_free_vmalloc_buffer(substream);
}
@@ -435,19 +494,28 @@ static int snd_usb_pcm_prepare(struct snd_pcm_substream *substream)
return -ENXIO;
}
+ if (snd_BUG_ON(!subs->data_endpoint))
+ return -EIO;
+
/* some unit conversions in runtime */
- subs->maxframesize = bytes_to_frames(runtime, subs->maxpacksize);
- subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
+ 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->phase = 0;
subs->last_delay = 0;
subs->last_frame_number = 0;
runtime->delay = 0;
- return snd_usb_substream_prepare(subs, runtime);
+ /* 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)
+ return start_endpoints(subs);
+
+ return 0;
}
static struct snd_pcm_hardware snd_usb_hardware =
@@ -840,16 +908,171 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
{
+ int ret;
struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
struct snd_usb_substream *subs = &as->substream[direction];
- if (!as->chip->shutdown && subs->interface >= 0) {
- usb_set_interface(subs->dev, subs->interface, 0);
- subs->interface = -1;
- }
+ stop_endpoints(subs, 0, 0, 0);
+ ret = deactivate_endpoints(subs);
subs->pcm_substream = NULL;
snd_usb_autosuspend(subs->stream->chip);
- return 0;
+
+ return ret;
+}
+
+/* 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;
+
+ 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;
+ if (urb->iso_frame_desc[i].status) {
+ snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
+ // continue;
+ }
+ bytes = urb->iso_frame_desc[i].actual_length;
+ frames = bytes / stride;
+ if (!subs->txfr_quirk)
+ bytes = frames * stride;
+ if (bytes % (runtime->sample_bits >> 3) != 0) {
+#ifdef CONFIG_SND_DEBUG_VERBOSE
+ int oldbytes = bytes;
+#endif
+ bytes = frames * stride;
+ snd_printdd(KERN_ERR "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;
+ }
+ 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 void prepare_playback_urb(struct snd_usb_substream *subs,
+ struct urb *urb)
+{
+ struct snd_pcm_runtime *runtime = subs->pcm_substream->runtime;
+ 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);
+ for (i = 0; i < ctx->packets; i++) {
+ counts = ctx->packet_size[i];
+ /* set up descriptor */
+ urb->iso_frame_desc[i].offset = frames * stride;
+ urb->iso_frame_desc[i].length = counts * stride;
+ frames += counts;
+ urb->number_of_packets++;
+ subs->transfer_done += counts;
+ if (subs->transfer_done >= runtime->period_size) {
+ subs->transfer_done -= runtime->period_size;
+ 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 * stride;
+ subs->transfer_done = 0;
+ }
+ i++;
+ if (i < ctx->packets) {
+ /* add a transfer delimiter */
+ urb->iso_frame_desc[i].offset =
+ frames * stride;
+ urb->iso_frame_desc[i].length = 0;
+ urb->number_of_packets++;
+ }
+ break;
+ }
+ }
+ if (period_elapsed &&
+ !snd_usb_endpoint_implict_feedback_sink(subs->data_endpoint)) /* finish at the period boundary */
+ break;
+ }
+ bytes = frames * stride;
+ 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,
+ runtime->dma_area + subs->hwptr_done, bytes1);
+ memcpy(urb->transfer_buffer + bytes1,
+ runtime->dma_area, bytes - bytes1);
+ } else {
+ memcpy(urb->transfer_buffer,
+ 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;
+ runtime->delay += frames;
+ 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;
+ int stride = runtime->frame_bits >> 3;
+ int processed = urb->transfer_buffer_length / stride;
+
+ spin_lock_irqsave(&subs->lock, flags);
+ if (processed > runtime->delay)
+ runtime->delay = 0;
+ else
+ runtime->delay -= processed;
+ spin_unlock_irqrestore(&subs->lock, flags);
}
static int snd_usb_playback_open(struct snd_pcm_substream *substream)
@@ -872,6 +1095,56 @@ static int snd_usb_capture_close(struct snd_pcm_substream *substream)
return snd_usb_pcm_close(substream, SNDRV_PCM_STREAM_CAPTURE);
}
+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:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ subs->data_endpoint->prepare_data_urb = prepare_playback_urb;
+ subs->data_endpoint->retire_data_urb = retire_playback_urb;
+ return 0;
+ case SNDRV_PCM_TRIGGER_STOP:
+ stop_endpoints(subs, 0, 0, 0);
+ return 0;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ subs->data_endpoint->prepare_data_urb = NULL;
+ subs->data_endpoint->retire_data_urb = NULL;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
+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;
+
+ subs->data_endpoint->retire_data_urb = retire_capture_urb;
+ return 0;
+ case SNDRV_PCM_TRIGGER_STOP:
+ stop_endpoints(subs, 0, 0, 0);
+ return 0;
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ subs->data_endpoint->retire_data_urb = NULL;
+ return 0;
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ subs->data_endpoint->retire_data_urb = retire_capture_urb;
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
static struct snd_pcm_ops snd_usb_playback_ops = {
.open = snd_usb_playback_open,
.close = snd_usb_playback_close,
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 5ff8010..6b7d7a2 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -73,6 +73,31 @@ static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
}
}
+/*
+ * initialize the substream instance.
+ */
+
+static void snd_usb_init_substream(struct snd_usb_stream *as,
+ int stream,
+ struct audioformat *fp)
+{
+ struct snd_usb_substream *subs = &as->substream[stream];
+
+ INIT_LIST_HEAD(&subs->fmt_list);
+ spin_lock_init(&subs->lock);
+
+ subs->stream = as;
+ subs->direction = stream;
+ subs->dev = as->chip->dev;
+ subs->txfr_quirk = as->chip->txfr_quirk;
+
+ 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;
+}
/*
* add this endpoint to the chip instance.
@@ -94,9 +119,9 @@ int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
if (as->fmt_type != fp->fmt_type)
continue;
subs = &as->substream[stream];
- if (!subs->endpoint)
+ if (!subs->data_endpoint)
continue;
- if (subs->endpoint == fp->endpoint) {
+ if (subs->data_endpoint->ep_num == fp->endpoint) {
list_add_tail(&fp->list, &subs->fmt_list);
subs->num_formats++;
subs->formats |= fp->formats;
@@ -109,7 +134,7 @@ int snd_usb_add_audio_stream(struct snd_usb_audio *chip,
if (as->fmt_type != fp->fmt_type)
continue;
subs = &as->substream[stream];
- if (subs->endpoint)
+ if (subs->data_endpoint)
continue;
err = snd_pcm_new_stream(as->pcm, stream, 1);
if (err < 0)
--
1.7.7.4
More information about the Alsa-devel
mailing list