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-rw-r--r--sound/usb/endpoint.c1609
1 files changed, 902 insertions, 707 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 08dcce53720b..e6906901debb 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -20,9 +20,11 @@
#include <linux/ratelimit.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
+#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
+#include <sound/pcm_params.h>
#include "usbaudio.h"
#include "helper.h"
@@ -30,6 +32,36 @@
#include "endpoint.h"
#include "pcm.h"
+#define EP_FLAG_ACTIVATED 0
+#define EP_FLAG_RUNNING 1
+
+/*
+ * snd_usb_endpoint is a model that abstracts everything related to an
+ * USB endpoint and its streaming.
+ *
+ * There are functions to activate and deactivate the streaming URBs and
+ * optional callbacks to let the pcm logic handle the actual content of the
+ * packets for playback and record. Thus, the bus streaming and the audio
+ * handlers are fully decoupled.
+ *
+ * There are two different types of endpoints in audio applications.
+ *
+ * SND_USB_ENDPOINT_TYPE_DATA handles full audio data payload for both
+ * inbound and outbound traffic.
+ *
+ * SND_USB_ENDPOINT_TYPE_SYNC endpoints are for inbound traffic only and
+ * expect the payload to carry Q10.14 / Q16.16 formatted sync information
+ * (3 or 4 bytes).
+ *
+ * Each endpoint has to be configured prior to being used by calling
+ * snd_usb_endpoint_set_params().
+ *
+ * The model incorporates a reference counting, so that multiple users
+ * can call snd_usb_endpoint_start() and snd_usb_endpoint_stop(), and
+ * only the first user will effectively start the URBs, and only the last
+ * one to stop it will tear the URBs down again.
+ */
+
/*
* convert a sampling rate into our full speed format (fs/1000 in Q16.16)
* this will overflow at approx 524 kHz
@@ -49,71 +81,415 @@ static inline unsigned get_usb_high_speed_rate(unsigned int rate)
}
/*
- * unlink active urbs.
+ * release a urb data
*/
-static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep)
+static void release_urb_ctx(struct snd_urb_ctx *u)
{
- struct snd_usb_audio *chip = subs->stream->chip;
- unsigned int i;
- int async;
+ if (u->buffer_size)
+ usb_free_coherent(u->ep->chip->dev, u->buffer_size,
+ u->urb->transfer_buffer,
+ u->urb->transfer_dma);
+ usb_free_urb(u->urb);
+ u->urb = NULL;
+}
+
+static const char *usb_error_string(int err)
+{
+ switch (err) {
+ case -ENODEV:
+ return "no device";
+ case -ENOENT:
+ return "endpoint not enabled";
+ case -EPIPE:
+ return "endpoint stalled";
+ case -ENOSPC:
+ return "not enough bandwidth";
+ case -ESHUTDOWN:
+ return "device disabled";
+ case -EHOSTUNREACH:
+ return "device suspended";
+ case -EINVAL:
+ case -EAGAIN:
+ case -EFBIG:
+ case -EMSGSIZE:
+ return "internal error";
+ default:
+ return "unknown error";
+ }
+}
+
+/**
+ * snd_usb_endpoint_implicit_feedback_sink: Report endpoint usage type
+ *
+ * @ep: The snd_usb_endpoint
+ *
+ * Determine whether an endpoint is driven by an implicit feedback
+ * data endpoint source.
+ */
+int snd_usb_endpoint_implict_feedback_sink(struct snd_usb_endpoint *ep)
+{
+ return ep->sync_master &&
+ ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA &&
+ ep->type == SND_USB_ENDPOINT_TYPE_DATA &&
+ usb_pipeout(ep->pipe);
+}
- subs->running = 0;
+/*
+ * For streaming based on information derived from sync endpoints,
+ * prepare_outbound_urb_sizes() will call next_packet_size() to
+ * determine the number of samples to be sent in the next packet.
+ *
+ * For implicit feedback, next_packet_size() is unused.
+ */
+static int next_packet_size(struct snd_usb_endpoint *ep)
+{
+ unsigned long flags;
+ int ret;
- if (!force && subs->stream->chip->shutdown) /* to be sure... */
- return -EBADFD;
+ if (ep->fill_max)
+ return ep->maxframesize;
- async = !can_sleep && chip->async_unlink;
+ spin_lock_irqsave(&ep->lock, flags);
+ ep->phase = (ep->phase & 0xffff)
+ + (ep->freqm << ep->datainterval);
+ ret = min(ep->phase >> 16, ep->maxframesize);
+ spin_unlock_irqrestore(&ep->lock, flags);
- if (!async && in_interrupt())
- return 0;
+ return ret;
+}
- for (i = 0; i < subs->nurbs; i++) {
- if (test_bit(i, &subs->active_mask)) {
- if (!test_and_set_bit(i, &subs->unlink_mask)) {
- struct urb *u = subs->dataurb[i].urb;
- if (async)
- usb_unlink_urb(u);
- else
- usb_kill_urb(u);
+static void retire_outbound_urb(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *urb_ctx)
+{
+ if (ep->retire_data_urb)
+ ep->retire_data_urb(ep->data_subs, urb_ctx->urb);
+}
+
+static void retire_inbound_urb(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *urb_ctx)
+{
+ struct urb *urb = urb_ctx->urb;
+
+ if (ep->sync_slave)
+ snd_usb_handle_sync_urb(ep->sync_slave, ep, urb);
+
+ if (ep->retire_data_urb)
+ ep->retire_data_urb(ep->data_subs, urb);
+}
+
+static void prepare_outbound_urb_sizes(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *ctx)
+{
+ int i;
+
+ for (i = 0; i < ctx->packets; ++i)
+ ctx->packet_size[i] = next_packet_size(ep);
+}
+
+/*
+ * Prepare a PLAYBACK urb for submission to the bus.
+ */
+static void prepare_outbound_urb(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *ctx)
+{
+ int i;
+ struct urb *urb = ctx->urb;
+ unsigned char *cp = urb->transfer_buffer;
+
+ urb->dev = ep->chip->dev; /* we need to set this at each time */
+
+ switch (ep->type) {
+ case SND_USB_ENDPOINT_TYPE_DATA:
+ if (ep->prepare_data_urb) {
+ ep->prepare_data_urb(ep->data_subs, urb);
+ } else {
+ /* no data provider, so send silence */
+ unsigned int offs = 0;
+ for (i = 0; i < ctx->packets; ++i) {
+ int counts = ctx->packet_size[i];
+ urb->iso_frame_desc[i].offset = offs * ep->stride;
+ urb->iso_frame_desc[i].length = counts * ep->stride;
+ offs += counts;
}
+
+ urb->number_of_packets = ctx->packets;
+ urb->transfer_buffer_length = offs * ep->stride;
+ memset(urb->transfer_buffer, ep->silence_value,
+ offs * ep->stride);
}
+ break;
+
+ case SND_USB_ENDPOINT_TYPE_SYNC:
+ if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) {
+ /*
+ * fill the length and offset of each urb descriptor.
+ * the fixed 12.13 frequency is passed as 16.16 through the pipe.
+ */
+ urb->iso_frame_desc[0].length = 4;
+ urb->iso_frame_desc[0].offset = 0;
+ cp[0] = ep->freqn;
+ cp[1] = ep->freqn >> 8;
+ cp[2] = ep->freqn >> 16;
+ cp[3] = ep->freqn >> 24;
+ } else {
+ /*
+ * fill the length and offset of each urb descriptor.
+ * the fixed 10.14 frequency is passed through the pipe.
+ */
+ urb->iso_frame_desc[0].length = 3;
+ urb->iso_frame_desc[0].offset = 0;
+ cp[0] = ep->freqn >> 2;
+ cp[1] = ep->freqn >> 10;
+ cp[2] = ep->freqn >> 18;
+ }
+
+ break;
}
- if (subs->syncpipe) {
- for (i = 0; i < SYNC_URBS; i++) {
- if (test_bit(i+16, &subs->active_mask)) {
- if (!test_and_set_bit(i+16, &subs->unlink_mask)) {
- struct urb *u = subs->syncurb[i].urb;
- if (async)
- usb_unlink_urb(u);
- else
- usb_kill_urb(u);
- }
- }
+}
+
+/*
+ * Prepare a CAPTURE or SYNC urb for submission to the bus.
+ */
+static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep,
+ struct snd_urb_ctx *urb_ctx)
+{
+ int i, offs;
+ struct urb *urb = urb_ctx->urb;
+
+ urb->dev = ep->chip->dev; /* we need to set this at each time */
+
+ switch (ep->type) {
+ case SND_USB_ENDPOINT_TYPE_DATA:
+ offs = 0;
+ for (i = 0; i < urb_ctx->packets; i++) {
+ urb->iso_frame_desc[i].offset = offs;
+ urb->iso_frame_desc[i].length = ep->curpacksize;
+ offs += ep->curpacksize;
}
+
+ urb->transfer_buffer_length = offs;
+ urb->number_of_packets = urb_ctx->packets;
+ break;
+
+ case SND_USB_ENDPOINT_TYPE_SYNC:
+ urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize);
+ urb->iso_frame_desc[0].offset = 0;
+ break;
}
- return 0;
}
+/*
+ * Send output urbs that have been prepared previously. URBs are dequeued
+ * from ep->ready_playback_urbs and in case there there aren't any available
+ * or there are no packets that have been prepared, this function does
+ * nothing.
+ *
+ * The reason why the functionality of sending and preparing URBs is separated
+ * is that host controllers don't guarantee the order in which they return
+ * inbound and outbound packets to their submitters.
+ *
+ * This function is only used for implicit feedback endpoints. For endpoints
+ * driven by dedicated sync endpoints, URBs are immediately re-submitted
+ * from their completion handler.
+ */
+static void queue_pending_output_urbs(struct snd_usb_endpoint *ep)
+{
+ while (test_bit(EP_FLAG_RUNNING, &ep->flags)) {
+
+ unsigned long flags;
+ struct snd_usb_packet_info *uninitialized_var(packet);
+ struct snd_urb_ctx *ctx = NULL;
+ struct urb *urb;
+ int err, i;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ if (ep->next_packet_read_pos != ep->next_packet_write_pos) {
+ packet = ep->next_packet + ep->next_packet_read_pos;
+ ep->next_packet_read_pos++;
+ ep->next_packet_read_pos %= MAX_URBS;
+
+ /* take URB out of FIFO */
+ if (!list_empty(&ep->ready_playback_urbs))
+ ctx = list_first_entry(&ep->ready_playback_urbs,
+ struct snd_urb_ctx, ready_list);
+ }
+ spin_unlock_irqrestore(&ep->lock, flags);
+
+ if (ctx == NULL)
+ return;
+
+ list_del_init(&ctx->ready_list);
+ urb = ctx->urb;
+
+ /* copy over the length information */
+ for (i = 0; i < packet->packets; i++)
+ ctx->packet_size[i] = packet->packet_size[i];
+
+ /* call the data handler to fill in playback data */
+ prepare_outbound_urb(ep, ctx);
+
+ err = usb_submit_urb(ctx->urb, GFP_ATOMIC);
+ if (err < 0)
+ snd_printk(KERN_ERR "Unable to submit urb #%d: %d (urb %p)\n",
+ ctx->index, err, ctx->urb);
+ else
+ set_bit(ctx->index, &ep->active_mask);
+ }
+}
/*
- * release a urb data
+ * complete callback for urbs
*/
-static void release_urb_ctx(struct snd_urb_ctx *u)
+static void snd_complete_urb(struct urb *urb)
+{
+ struct snd_urb_ctx *ctx = urb->context;
+ struct snd_usb_endpoint *ep = ctx->ep;
+ int err;
+
+ if (unlikely(urb->status == -ENOENT || /* unlinked */
+ urb->status == -ENODEV || /* device removed */
+ urb->status == -ECONNRESET || /* unlinked */
+ urb->status == -ESHUTDOWN || /* device disabled */
+ ep->chip->shutdown)) /* device disconnected */
+ goto exit_clear;
+
+ if (usb_pipeout(ep->pipe)) {
+ retire_outbound_urb(ep, ctx);
+ /* can be stopped during retire callback */
+ if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
+ goto exit_clear;
+
+ if (snd_usb_endpoint_implict_feedback_sink(ep)) {
+ unsigned long flags;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
+ spin_unlock_irqrestore(&ep->lock, flags);
+ queue_pending_output_urbs(ep);
+
+ goto exit_clear;
+ }
+
+ prepare_outbound_urb_sizes(ep, ctx);
+ prepare_outbound_urb(ep, ctx);
+ } else {
+ retire_inbound_urb(ep, ctx);
+ /* can be stopped during retire callback */
+ if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags)))
+ goto exit_clear;
+
+ prepare_inbound_urb(ep, ctx);
+ }
+
+ err = usb_submit_urb(urb, GFP_ATOMIC);
+ if (err == 0)
+ return;
+
+ snd_printk(KERN_ERR "cannot submit urb (err = %d)\n", err);
+ //snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+
+exit_clear:
+ clear_bit(ctx->index, &ep->active_mask);
+}
+
+/**
+ * snd_usb_add_endpoint: Add an endpoint to an USB audio chip
+ *
+ * @chip: The chip
+ * @alts: The USB host interface
+ * @ep_num: The number of the endpoint to use
+ * @direction: SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE
+ * @type: SND_USB_ENDPOINT_TYPE_DATA or SND_USB_ENDPOINT_TYPE_SYNC
+ *
+ * If the requested endpoint has not been added to the given chip before,
+ * a new instance is created. Otherwise, a pointer to the previoulsy
+ * created instance is returned. In case of any error, NULL is returned.
+ *
+ * New endpoints will be added to chip->ep_list and must be freed by
+ * calling snd_usb_endpoint_free().
+ */
+struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip,
+ struct usb_host_interface *alts,
+ int ep_num, int direction, int type)
{
- if (u->urb) {
- if (u->buffer_size)
- usb_free_coherent(u->subs->dev, u->buffer_size,
- u->urb->transfer_buffer,
- u->urb->transfer_dma);
- usb_free_urb(u->urb);
- u->urb = NULL;
+ struct list_head *p;
+ struct snd_usb_endpoint *ep;
+ int ret, is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK;
+
+ mutex_lock(&chip->mutex);
+
+ list_for_each(p, &chip->ep_list) {
+ ep = list_entry(p, struct snd_usb_endpoint, list);
+ if (ep->ep_num == ep_num &&
+ ep->iface == alts->desc.bInterfaceNumber &&
+ ep->alt_idx == alts->desc.bAlternateSetting) {
+ snd_printdd(KERN_DEBUG "Re-using EP %x in iface %d,%d @%p\n",
+ ep_num, ep->iface, ep->alt_idx, ep);
+ goto __exit_unlock;
+ }
+ }
+
+ snd_printdd(KERN_DEBUG "Creating new %s %s endpoint #%x\n",
+ is_playback ? "playback" : "capture",
+ type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync",
+ ep_num);
+
+ /* select the alt setting once so the endpoints become valid */
+ ret = usb_set_interface(chip->dev, alts->desc.bInterfaceNumber,
+ alts->desc.bAlternateSetting);
+ if (ret < 0) {
+ snd_printk(KERN_ERR "%s(): usb_set_interface() failed, ret = %d\n",
+ __func__, ret);
+ ep = NULL;
+ goto __exit_unlock;
}
+
+ ep = kzalloc(sizeof(*ep), GFP_KERNEL);
+ if (!ep)
+ goto __exit_unlock;
+
+ ep->chip = chip;
+ spin_lock_init(&ep->lock);
+ ep->type = type;
+ ep->ep_num = ep_num;
+ ep->iface = alts->desc.bInterfaceNumber;
+ ep->alt_idx = alts->desc.bAlternateSetting;
+ INIT_LIST_HEAD(&ep->ready_playback_urbs);
+ ep_num &= USB_ENDPOINT_NUMBER_MASK;
+
+ if (is_playback)
+ ep->pipe = usb_sndisocpipe(chip->dev, ep_num);
+ else
+ ep->pipe = usb_rcvisocpipe(chip->dev, ep_num);
+
+ if (type == SND_USB_ENDPOINT_TYPE_SYNC) {
+ if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE &&
+ get_endpoint(alts, 1)->bRefresh >= 1 &&
+ get_endpoint(alts, 1)->bRefresh <= 9)
+ ep->syncinterval = get_endpoint(alts, 1)->bRefresh;
+ else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL)
+ ep->syncinterval = 1;
+ else if (get_endpoint(alts, 1)->bInterval >= 1 &&
+ get_endpoint(alts, 1)->bInterval <= 16)
+ ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1;
+ else
+ ep->syncinterval = 3;
+
+ ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize);
+ }
+
+ list_add_tail(&ep->list, &chip->ep_list);
+
+__exit_unlock:
+ mutex_unlock(&chip->mutex);
+
+ return ep;
}
/*
* wait until all urbs are processed.
*/
-static int wait_clear_urbs(struct snd_usb_substream *subs)
+static int wait_clear_urbs(struct snd_usb_endpoint *ep)
{
unsigned long end_time = jiffies + msecs_to_jiffies(1000);
unsigned int i;
@@ -121,153 +497,148 @@ static int wait_clear_urbs(struct snd_usb_substream *subs)
do {
alive = 0;
- for (i = 0; i < subs->nurbs; i++) {
- if (test_bit(i, &subs->active_mask))
+ for (i = 0; i < ep->nurbs; i++)
+ if (test_bit(i, &ep->active_mask))
alive++;
- }
- if (subs->syncpipe) {
- for (i = 0; i < SYNC_URBS; i++) {
- if (test_bit(i + 16, &subs->active_mask))
- alive++;
- }
- }
- if (! alive)
+
+ if (!alive)
break;
+
schedule_timeout_uninterruptible(1);
} while (time_before(jiffies, end_time));
+
if (alive)
- snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
+ snd_printk(KERN_ERR "timeout: still %d active urbs on EP #%x\n",
+ alive, ep->ep_num);
+
return 0;
}
/*
- * release a substream
+ * unlink active urbs.
*/
-void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force)
+static int deactivate_urbs(struct snd_usb_endpoint *ep, int force, int can_sleep)
{
- int i;
+ unsigned int i;
+ int async;
- /* stop urbs (to be sure) */
- deactivate_urbs(subs, force, 1);
- wait_clear_urbs(subs);
-
- for (i = 0; i < MAX_URBS; i++)
- release_urb_ctx(&subs->dataurb[i]);
- for (i = 0; i < SYNC_URBS; i++)
- release_urb_ctx(&subs->syncurb[i]);
- usb_free_coherent(subs->dev, SYNC_URBS * 4,
- subs->syncbuf, subs->sync_dma);
- subs->syncbuf = NULL;
- subs->nurbs = 0;
-}
+ if (!force && ep->chip->shutdown) /* to be sure... */
+ return -EBADFD;
-/*
- * complete callback from data urb
- */
-static void snd_complete_urb(struct urb *urb)
-{
- struct snd_urb_ctx *ctx = urb->context;
- struct snd_usb_substream *subs = ctx->subs;
- struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
- int err = 0;
-
- if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) ||
- !subs->running || /* can be stopped during retire callback */
- (err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 ||
- (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
- clear_bit(ctx->index, &subs->active_mask);
- if (err < 0) {
- snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err);
- snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ async = !can_sleep && ep->chip->async_unlink;
+
+ clear_bit(EP_FLAG_RUNNING, &ep->flags);
+
+ INIT_LIST_HEAD(&ep->ready_playback_urbs);
+ ep->next_packet_read_pos = 0;
+ ep->next_packet_write_pos = 0;
+
+ if (!async && in_interrupt())
+ return 0;
+
+ for (i = 0; i < ep->nurbs; i++) {
+ if (test_bit(i, &ep->active_mask)) {
+ if (!test_and_set_bit(i, &ep->unlink_mask)) {
+ struct urb *u = ep->urb[i].urb;
+ if (async)
+ usb_unlink_urb(u);
+ else
+ usb_kill_urb(u);
+ }
}
}
-}
+ return 0;
+}
/*
- * complete callback from sync urb
+ * release an endpoint's urbs
*/
-static void snd_complete_sync_urb(struct urb *urb)
+static void release_urbs(struct snd_usb_endpoint *ep, int force)
{
- struct snd_urb_ctx *ctx = urb->context;
- struct snd_usb_substream *subs = ctx->subs;
- struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
- int err = 0;
-
- if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) ||
- !subs->running || /* can be stopped during retire callback */
- (err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 ||
- (err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
- clear_bit(ctx->index + 16, &subs->active_mask);
- if (err < 0) {
- snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err);
- snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
- }
- }
-}
+ int i;
+ /* route incoming urbs to nirvana */
+ ep->retire_data_urb = NULL;
+ ep->prepare_data_urb = NULL;
+
+ /* stop urbs */
+ deactivate_urbs(ep, force, 1);
+ wait_clear_urbs(ep);
+
+ for (i = 0; i < ep->nurbs; i++)
+ release_urb_ctx(&ep->urb[i]);
+
+ if (ep->syncbuf)
+ usb_free_coherent(ep->chip->dev, SYNC_URBS * 4,
+ ep->syncbuf, ep->sync_dma);
+
+ ep->syncbuf = NULL;
+ ep->nurbs = 0;
+}
/*
- * initialize a substream for plaback/capture
+ * configure a data endpoint
*/
-int snd_usb_init_substream_urbs(struct snd_usb_substream *subs,
- unsigned int period_bytes,
- unsigned int rate,
- unsigned int frame_bits)
+static int data_ep_set_params(struct snd_usb_endpoint *ep,
+ struct snd_pcm_hw_params *hw_params,
+ struct audioformat *fmt,
+ struct snd_usb_endpoint *sync_ep)
{
- unsigned int maxsize, i;
- int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
- unsigned int urb_packs, total_packs, packs_per_ms;
- struct snd_usb_audio *chip = subs->stream->chip;
+ unsigned int maxsize, i, urb_packs, total_packs, packs_per_ms;
+ int period_bytes = params_period_bytes(hw_params);
+ int format = params_format(hw_params);
+ int is_playback = usb_pipeout(ep->pipe);
+ int frame_bits = snd_pcm_format_physical_width(params_format(hw_params)) *
+ params_channels(hw_params);
+
+ ep->datainterval = fmt->datainterval;
+ ep->stride = frame_bits >> 3;
+ ep->silence_value = format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0;
- /* calculate the frequency in 16.16 format */
- if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
- subs->freqn = get_usb_full_speed_rate(rate);
- else
- subs->freqn = get_usb_high_speed_rate(rate);
- subs->freqm = subs->freqn;
- subs->freqshift = INT_MIN;
/* calculate max. frequency */
- if (subs->maxpacksize) {
+ if (ep->maxpacksize) {
/* whatever fits into a max. size packet */
- maxsize = subs->maxpacksize;
- subs->freqmax = (maxsize / (frame_bits >> 3))
- << (16 - subs->datainterval);
+ maxsize = ep->maxpacksize;
+ ep->freqmax = (maxsize / (frame_bits >> 3))
+ << (16 - ep->datainterval);
} else {
/* no max. packet size: just take 25% higher than nominal */
- subs->freqmax = subs->freqn + (subs->freqn >> 2);
- maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3))
- >> (16 - subs->datainterval);
+ ep->freqmax = ep->freqn + (ep->freqn >> 2);
+ maxsize = ((ep->freqmax + 0xffff) * (frame_bits >> 3))
+ >> (16 - ep->datainterval);
}
- subs->phase = 0;
- if (subs->fill_max)
- subs->curpacksize = subs->maxpacksize;
+ if (ep->fill_max)
+ ep->curpacksize = ep->maxpacksize;
else
- subs->curpacksize = maxsize;
+ ep->curpacksize = maxsize;
- if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL)
- packs_per_ms = 8 >> subs->datainterval;
+ if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL)
+ packs_per_ms = 8 >> ep->datainterval;
else
packs_per_ms = 1;
- if (is_playback) {
- urb_packs = max(chip->nrpacks, 1);
- urb_packs = min(urb_packs, (unsigned int)MAX_PACKS);
- } else
+ if (is_playback && !snd_usb_endpoint_implict_feedback_sink(ep)) {
+ urb_packs = max(ep->chip->nrpacks, 1);
+ urb_packs = min(urb_packs, (unsigned int) MAX_PACKS);
+ } else {
urb_packs = 1;
+ }
+
urb_packs *= packs_per_ms;
- if (subs->syncpipe)
- urb_packs = min(urb_packs, 1U << subs->syncinterval);
+
+ if (sync_ep && !snd_usb_endpoint_implict_feedback_sink(ep))
+ urb_packs = min(urb_packs, 1U << sync_ep->syncinterval);
/* decide how many packets to be used */
- if (is_playback) {
+ if (is_playback && !snd_usb_endpoint_implict_feedback_sink(ep)) {
unsigned int minsize, maxpacks;
/* determine how small a packet can be */
- minsize = (subs->freqn >> (16 - subs->datainterval))
+ minsize = (ep->freqn >> (16 - ep->datainterval))
* (frame_bits >> 3);
/* with sync from device, assume it can be 12% lower */
- if (subs->syncpipe)
+ if (sync_ep)
minsize -= minsize >> 3;
minsize = max(minsize, 1u);
total_packs = (period_bytes + minsize - 1) / minsize;
@@ -284,284 +655,472 @@ int snd_usb_init_substream_urbs(struct snd_usb_substream *subs,
urb_packs >>= 1;
total_packs = MAX_URBS * urb_packs;
}
- subs->nurbs = (total_packs + urb_packs - 1) / urb_packs;
- if (subs->nurbs > MAX_URBS) {
+
+ ep->nurbs = (total_packs + urb_packs - 1) / urb_packs;
+ if (ep->nurbs > MAX_URBS) {
/* too much... */
- subs->nurbs = MAX_URBS;
+ ep->nurbs = MAX_URBS;
total_packs = MAX_URBS * urb_packs;
- } else if (subs->nurbs < 2) {
+ } else if (ep->nurbs < 2) {
/* too little - we need at least two packets
* to ensure contiguous playback/capture
*/
- subs->nurbs = 2;
+ ep->nurbs = 2;
}
/* allocate and initialize data urbs */
- for (i = 0; i < subs->nurbs; i++) {
- struct snd_urb_ctx *u = &subs->dataurb[i];
+ for (i = 0; i < ep->nurbs; i++) {
+ struct snd_urb_ctx *u = &ep->urb[i];
u->index = i;
- u->subs = subs;
- u->packets = (i + 1) * total_packs / subs->nurbs
- - i * total_packs / subs->nurbs;
+ u->ep = ep;
+ u->packets = (i + 1) * total_packs / ep->nurbs
+ - i * total_packs / ep->nurbs;
u->buffer_size = maxsize * u->packets;
- if (subs->fmt_type == UAC_FORMAT_TYPE_II)
+
+ if (fmt->fmt_type == UAC_FORMAT_TYPE_II)
u->packets++; /* for transfer delimiter */
u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
if (!u->urb)
goto out_of_memory;
+
u->urb->transfer_buffer =
- usb_alloc_coherent(subs->dev, u->buffer_size,
+ usb_alloc_coherent(ep->chip->dev, u->buffer_size,
GFP_KERNEL, &u->urb->transfer_dma);
if (!u->urb->transfer_buffer)
goto out_of_memory;
- u->urb->pipe = subs->datapipe;
+ u->urb->pipe = ep->pipe;
u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
- u->urb->interval = 1 << subs->datainterval;
+ u->urb->interval = 1 << ep->datainterval;
u->urb->context = u;
u->urb->complete = snd_complete_urb;
+ INIT_LIST_HEAD(&u->ready_list);
}
- if (subs->syncpipe) {
- /* allocate and initialize sync urbs */
- subs->syncbuf = usb_alloc_coherent(subs->dev, SYNC_URBS * 4,
- GFP_KERNEL, &subs->sync_dma);
- if (!subs->syncbuf)
- goto out_of_memory;
- for (i = 0; i < SYNC_URBS; i++) {
- struct snd_urb_ctx *u = &subs->syncurb[i];
- u->index = i;
- u->subs = subs;
- u->packets = 1;
- u->urb = usb_alloc_urb(1, GFP_KERNEL);
- if (!u->urb)
- goto out_of_memory;
- u->urb->transfer_buffer = subs->syncbuf + i * 4;
- u->urb->transfer_dma = subs->sync_dma + i * 4;
- u->urb->transfer_buffer_length = 4;
- u->urb->pipe = subs->syncpipe;
- u->urb->transfer_flags = URB_ISO_ASAP |
- URB_NO_TRANSFER_DMA_MAP;
- u->urb->number_of_packets = 1;
- u->urb->interval = 1 << subs->syncinterval;
- u->urb->context = u;
- u->urb->complete = snd_complete_sync_urb;
- }
- }
return 0;
out_of_memory:
- snd_usb_release_substream_urbs(subs, 0);
+ release_urbs(ep, 0);
return -ENOMEM;
}
/*
- * prepare urb for full speed capture sync pipe
- *
- * fill the length and offset of each urb descriptor.
- * the fixed 10.14 frequency is passed through the pipe.
+ * configure a sync endpoint
*/
-static int prepare_capture_sync_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
+static int sync_ep_set_params(struct snd_usb_endpoint *ep,
+ struct snd_pcm_hw_params *hw_params,
+ struct audioformat *fmt)
{
- unsigned char *cp = urb->transfer_buffer;
- struct snd_urb_ctx *ctx = urb->context;
+ int i;
+
+ ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4,
+ GFP_KERNEL, &ep->sync_dma);
+ if (!ep->syncbuf)
+ return -ENOMEM;
+
+ for (i = 0; i < SYNC_URBS; i++) {
+ struct snd_urb_ctx *u = &ep->urb[i];
+ u->index = i;
+ u->ep = ep;
+ u->packets = 1;
+ u->urb = usb_alloc_urb(1, GFP_KERNEL);
+ if (!u->urb)
+ goto out_of_memory;
+ u->urb->transfer_buffer = ep->syncbuf + i * 4;
+ u->urb->transfer_dma = ep->sync_dma + i * 4;
+ u->urb->transfer_buffer_length = 4;
+ u->urb->pipe = ep->pipe;
+ u->urb->transfer_flags = URB_ISO_ASAP |
+ URB_NO_TRANSFER_DMA_MAP;
+ u->urb->number_of_packets = 1;
+ u->urb->interval = 1 << ep->syncinterval;
+ u->urb->context = u;
+ u->urb->complete = snd_complete_urb;
+ }
+
+ ep->nurbs = SYNC_URBS;
- urb->dev = ctx->subs->dev; /* we need to set this at each time */
- urb->iso_frame_desc[0].length = 3;
- urb->iso_frame_desc[0].offset = 0;
- cp[0] = subs->freqn >> 2;
- cp[1] = subs->freqn >> 10;
- cp[2] = subs->freqn >> 18;
return 0;
+
+out_of_memory:
+ release_urbs(ep, 0);
+ return -ENOMEM;
}
-/*
- * prepare urb for high speed capture sync pipe
+/**
+ * snd_usb_endpoint_set_params: configure an snd_usb_endpoint
+ *
+ * @ep: the snd_usb_endpoint to configure
+ * @hw_params: the hardware parameters
+ * @fmt: the USB audio format information
+ * @sync_ep: the sync endpoint to use, if any
*
- * fill the length and offset of each urb descriptor.
- * the fixed 12.13 frequency is passed as 16.16 through the pipe.
+ * Determine the number of URBs to be used on this endpoint.
+ * An endpoint must be configured before it can be started.
+ * An endpoint that is already running can not be reconfigured.
*/
-static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
+int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep,
+ struct snd_pcm_hw_params *hw_params,
+ struct audioformat *fmt,
+ struct snd_usb_endpoint *sync_ep)
{
- unsigned char *cp = urb->transfer_buffer;
- struct snd_urb_ctx *ctx = urb->context;
+ int err;
- urb->dev = ctx->subs->dev; /* we need to set this at each time */
- urb->iso_frame_desc[0].length = 4;
- urb->iso_frame_desc[0].offset = 0;
- cp[0] = subs->freqn;
- cp[1] = subs->freqn >> 8;
- cp[2] = subs->freqn >> 16;
- cp[3] = subs->freqn >> 24;
- return 0;
+ if (ep->use_count != 0) {
+ snd_printk(KERN_WARNING "Unable to change format on ep #%x: already in use\n",
+ ep->ep_num);
+ return -EBUSY;
+ }
+
+ /* release old buffers, if any */
+ release_urbs(ep, 0);
+
+ ep->datainterval = fmt->datainterval;
+ ep->maxpacksize = fmt->maxpacksize;
+ ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX);
+
+ if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL)
+ ep->freqn = get_usb_full_speed_rate(params_rate(hw_params));
+ else
+ ep->freqn = get_usb_high_speed_rate(params_rate(hw_params));
+
+ /* calculate the frequency in 16.16 format */
+ ep->freqm = ep->freqn;
+ ep->freqshift = INT_MIN;
+
+ ep->phase = 0;
+
+ switch (ep->type) {
+ case SND_USB_ENDPOINT_TYPE_DATA:
+ err = data_ep_set_params(ep, hw_params, fmt, sync_ep);
+ break;
+ case SND_USB_ENDPOINT_TYPE_SYNC:
+ err = sync_ep_set_params(ep, hw_params, fmt);
+ break;
+ default:
+ err = -EINVAL;
+ }
+
+ snd_printdd(KERN_DEBUG "Setting params for ep #%x (type %d, %d urbs), ret=%d\n",
+ ep->ep_num, ep->type, ep->nurbs, err);
+
+ return err;
}
-/*
- * process after capture sync complete
- * - nothing to do
+/**
+ * snd_usb_endpoint_start: start an snd_usb_endpoint
+ *
+ * @ep: the endpoint to start
+ *
+ * A call to this function will increment the use count of the endpoint.
+ * In case it is not already running, the URBs for this endpoint will be
+ * submitted. Otherwise, this function does nothing.
+ *
+ * Must be balanced to calls of snd_usb_endpoint_stop().
+ *
+ * Returns an error if the URB submission failed, 0 in all other cases.
*/
-static int retire_capture_sync_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
+int snd_usb_endpoint_start(struct snd_usb_endpoint *ep)
{
+ int err;
+ unsigned int i;
+
+ if (ep->chip->shutdown)
+ return -EBADFD;
+
+ /* already running? */
+ if (++ep->use_count != 1)
+ return 0;
+
+ if (snd_BUG_ON(!test_bit(EP_FLAG_ACTIVATED, &ep->flags)))
+ return -EINVAL;
+
+ /* just to be sure */
+ deactivate_urbs(ep, 0, 1);
+ wait_clear_urbs(ep);
+
+ ep->active_mask = 0;
+ ep->unlink_mask = 0;
+ ep->phase = 0;
+
+ /*
+ * If this endpoint has a data endpoint as implicit feedback source,
+ * don't start the urbs here. Instead, mark them all as available,
+ * wait for the record urbs to return and queue the playback urbs
+ * from that context.
+ */
+
+ set_bit(EP_FLAG_RUNNING, &ep->flags);
+
+ if (snd_usb_endpoint_implict_feedback_sink(ep)) {
+ for (i = 0; i < ep->nurbs; i++) {
+ struct snd_urb_ctx *ctx = ep->urb + i;
+ list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs);
+ }
+
+ return 0;
+ }
+
+ for (i = 0; i < ep->nurbs; i++) {
+ struct urb *urb = ep->urb[i].urb;
+
+ if (snd_BUG_ON(!urb))
+ goto __error;
+
+ if (usb_pipeout(ep->pipe)) {
+ prepare_outbound_urb_sizes(ep, urb->context);
+ prepare_outbound_urb(ep, urb->context);
+ } else {
+ prepare_inbound_urb(ep, urb->context);
+ }
+
+ err = usb_submit_urb(urb, GFP_ATOMIC);
+ if (err < 0) {
+ snd_printk(KERN_ERR "cannot submit urb %d, error %d: %s\n",
+ i, err, usb_error_string(err));
+ goto __error;
+ }
+ set_bit(i, &ep->active_mask);
+ }
+
return 0;
+
+__error:
+ clear_bit(EP_FLAG_RUNNING, &ep->flags);
+ ep->use_count--;
+ deactivate_urbs(ep, 0, 0);
+ return -EPIPE;
}
-/*
- * prepare urb for capture data pipe
+/**
+ * snd_usb_endpoint_stop: stop an snd_usb_endpoint
+ *
+ * @ep: the endpoint to stop (may be NULL)
*
- * fill the offset and length of each descriptor.
+ * A call to this function will decrement the use count of the endpoint.
+ * In case the last user has requested the endpoint stop, the URBs will
+ * actually be deactivated.
*
- * we use a temporary buffer to write the captured data.
- * since the length of written data is determined by host, we cannot
- * write onto the pcm buffer directly... the data is thus copied
- * later at complete callback to the global buffer.
+ * Must be balanced to calls of snd_usb_endpoint_start().
*/
-static int prepare_capture_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
+void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep,
+ int force, int can_sleep, int wait)
{
- int i, offs;
- struct snd_urb_ctx *ctx = urb->context;
+ if (!ep)
+ return;
- offs = 0;
- urb->dev = ctx->subs->dev; /* we need to set this at each time */
- for (i = 0; i < ctx->packets; i++) {
- urb->iso_frame_desc[i].offset = offs;
- urb->iso_frame_desc[i].length = subs->curpacksize;
- offs += subs->curpacksize;
+ if (snd_BUG_ON(ep->use_count == 0))
+ return;
+
+ if (snd_BUG_ON(!test_bit(EP_FLAG_ACTIVATED, &ep->flags)))
+ return;
+
+ if (--ep->use_count == 0) {
+ deactivate_urbs(ep, force, can_sleep);
+ ep->data_subs = NULL;
+ ep->sync_slave = NULL;
+ ep->retire_data_urb = NULL;
+ ep->prepare_data_urb = NULL;
+
+ if (wait)
+ wait_clear_urbs(ep);
}
- urb->transfer_buffer_length = offs;
- urb->number_of_packets = ctx->packets;
- return 0;
}
-/*
- * process after capture complete
+/**
+ * snd_usb_endpoint_activate: activate an snd_usb_endpoint
+ *
+ * @ep: the endpoint to activate
+ *
+ * If the endpoint is not currently in use, this functions will select the
+ * correct alternate interface setting for the interface of this endpoint.
*
- * copy the data from each desctiptor to the pcm buffer, and
- * update the current position.
+ * In case of any active users, this functions does nothing.
+ *
+ * Returns an error if usb_set_interface() failed, 0 in all other
+ * cases.
*/
-static int retire_capture_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
+int snd_usb_endpoint_activate(struct snd_usb_endpoint *ep)
{
- unsigned long flags;
- unsigned char *cp;
- int i;
- unsigned int stride, frames, bytes, oldptr;
- int period_elapsed = 0;
+ if (ep->use_count != 0)
+ return 0;
- stride = runtime->frame_bits >> 3;
+ if (!ep->chip->shutdown &&
+ !test_and_set_bit(EP_FLAG_ACTIVATED, &ep->flags)) {
+ int ret;
- 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 && printk_ratelimit()) {
- snd_printdd("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);
+ ret = usb_set_interface(ep->chip->dev, ep->iface, ep->alt_idx);
+ if (ret < 0) {
+ snd_printk(KERN_ERR "%s() usb_set_interface() failed, ret = %d\n",
+ __func__, ret);
+ clear_bit(EP_FLAG_ACTIVATED, &ep->flags);
+ return ret;
}
+
+ return 0;
}
- if (period_elapsed)
- snd_pcm_period_elapsed(subs->pcm_substream);
- return 0;
+
+ return -EBUSY;
}
-/*
- * Process after capture complete when paused. Nothing to do.
+/**
+ * snd_usb_endpoint_deactivate: deactivate an snd_usb_endpoint
+ *
+ * @ep: the endpoint to deactivate
+ *
+ * If the endpoint is not currently in use, this functions will select the
+ * alternate interface setting 0 for the interface of this endpoint.
+ *
+ * In case of any active users, this functions does nothing.
+ *
+ * Returns an error if usb_set_interface() failed, 0 in all other
+ * cases.
*/
-static int retire_paused_capture_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
+int snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep)
{
- return 0;
-}
+ if (!ep)
+ return -EINVAL;
+ if (ep->use_count != 0)
+ return 0;
-/*
- * prepare urb for playback sync pipe
+ if (!ep->chip->shutdown &&
+ test_and_clear_bit(EP_FLAG_ACTIVATED, &ep->flags)) {
+ int ret;
+
+ ret = usb_set_interface(ep->chip->dev, ep->iface, 0);
+ if (ret < 0) {
+ snd_printk(KERN_ERR "%s(): usb_set_interface() failed, ret = %d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ return 0;
+ }
+
+ return -EBUSY;
+}
+
+/**
+ * snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint
+ *
+ * @ep: the list header of the endpoint to free
*
- * set up the offset and length to receive the current frequency.
+ * This function does not care for the endpoint's use count but will tear
+ * down all the streaming URBs immediately and free all resources.
*/
-static int prepare_playback_sync_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
+void snd_usb_endpoint_free(struct list_head *head)
{
- struct snd_urb_ctx *ctx = urb->context;
+ struct snd_usb_endpoint *ep;
- urb->dev = ctx->subs->dev; /* we need to set this at each time */
- urb->iso_frame_desc[0].length = min(4u, ctx->subs->syncmaxsize);
- urb->iso_frame_desc[0].offset = 0;
- return 0;
+ ep = list_entry(head, struct snd_usb_endpoint, list);
+ release_urbs(ep, 1);
+ kfree(ep);
}
-/*
- * process after playback sync complete
- *
- * Full speed devices report feedback values in 10.14 format as samples per
- * frame, high speed devices in 16.16 format as samples per microframe.
- * Because the Audio Class 1 spec was written before USB 2.0, many high speed
- * devices use a wrong interpretation, some others use an entirely different
- * format. Therefore, we cannot predict what format any particular device uses
- * and must detect it automatically.
+/**
+ * snd_usb_handle_sync_urb: parse an USB sync packet
+ *
+ * @ep: the endpoint to handle the packet
+ * @sender: the sending endpoint
+ * @urb: the received packet
+ *
+ * This function is called from the context of an endpoint that received
+ * the packet and is used to let another endpoint object handle the payload.
*/
-static int retire_playback_sync_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
+void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep,
+ struct snd_usb_endpoint *sender,
+ const struct urb *urb)
{
- unsigned int f;
int shift;
+ unsigned int f;
unsigned long flags;
+ snd_BUG_ON(ep == sender);
+
+ /*
+ * In case the endpoint is operating in implicit feedback mode, prepare
+ * a new outbound URB that has the same layout as the received packet
+ * and add it to the list of pending urbs. queue_pending_output_urbs()
+ * will take care of them later.
+ */
+ if (snd_usb_endpoint_implict_feedback_sink(ep) &&
+ ep->use_count != 0) {
+
+ /* implicit feedback case */
+ int i, bytes = 0;
+ struct snd_urb_ctx *in_ctx;
+ struct snd_usb_packet_info *out_packet;
+
+ in_ctx = urb->context;
+
+ /* Count overall packet size */
+ for (i = 0; i < in_ctx->packets; i++)
+ if (urb->iso_frame_desc[i].status == 0)
+ bytes += urb->iso_frame_desc[i].actual_length;
+
+ /*
+ * skip empty packets. At least M-Audio's Fast Track Ultra stops
+ * streaming once it received a 0-byte OUT URB
+ */
+ if (bytes == 0)
+ return;
+
+ spin_lock_irqsave(&ep->lock, flags);
+ out_packet = ep->next_packet + ep->next_packet_write_pos;
+
+ /*
+ * Iterate through the inbound packet and prepare the lengths
+ * for the output packet. The OUT packet we are about to send
+ * will have the same amount of payload bytes than the IN
+ * packet we just received.
+ */
+
+ out_packet->packets = in_ctx->packets;
+ for (i = 0; i < in_ctx->packets; i++) {
+ if (urb->iso_frame_desc[i].status == 0)
+ out_packet->packet_size[i] =
+ urb->iso_frame_desc[i].actual_length / ep->stride;
+ else
+ out_packet->packet_size[i] = 0;
+ }
+
+ ep->next_packet_write_pos++;
+ ep->next_packet_write_pos %= MAX_URBS;
+ spin_unlock_irqrestore(&ep->lock, flags);
+ queue_pending_output_urbs(ep);
+
+ return;
+ }
+
+ /*
+ * process after playback sync complete
+ *
+ * Full speed devices report feedback values in 10.14 format as samples
+ * per frame, high speed devices in 16.16 format as samples per
+ * microframe.
+ *
+ * Because the Audio Class 1 spec was written before USB 2.0, many high
+ * speed devices use a wrong interpretation, some others use an
+ * entirely different format.
+ *
+ * Therefore, we cannot predict what format any particular device uses
+ * and must detect it automatically.
+ */
+
if (urb->iso_frame_desc[0].status != 0 ||
urb->iso_frame_desc[0].actual_length < 3)
- return 0;
+ return;
f = le32_to_cpup(urb->transfer_buffer);
if (urb->iso_frame_desc[0].actual_length == 3)
f &= 0x00ffffff;
else
f &= 0x0fffffff;
+
if (f == 0)
- return 0;
+ return;
- if (unlikely(subs->freqshift == INT_MIN)) {
+ if (unlikely(ep->freqshift == INT_MIN)) {
/*
* The first time we see a feedback value, determine its format
* by shifting it left or right until it matches the nominal
@@ -569,398 +1128,34 @@ static int retire_playback_sync_urb(struct snd_usb_substream *subs,
* differ from the nominal value more than +50% or -25%.
*/
shift = 0;
- while (f < subs->freqn - subs->freqn / 4) {
+ while (f < ep->freqn - ep->freqn / 4) {
f <<= 1;
shift++;
}
- while (f > subs->freqn + subs->freqn / 2) {
+ while (f > ep->freqn + ep->freqn / 2) {
f >>= 1;
shift--;
}
- subs->freqshift = shift;
- }
- else if (subs->freqshift >= 0)
- f <<= subs->freqshift;
+ ep->freqshift = shift;
+ } else if (ep->freqshift >= 0)
+ f <<= ep->freqshift;
else
- f >>= -subs->freqshift;
+ f >>= -ep->freqshift;
- if (likely(f >= subs->freqn - subs->freqn / 8 && f <= subs->freqmax)) {
+ if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) {
/*
* If the frequency looks valid, set it.
* This value is referred to in prepare_playback_urb().
*/
- spin_lock_irqsave(&subs->lock, flags);
- subs->freqm = f;
- spin_unlock_irqrestore(&subs->lock, flags);
+ spin_lock_irqsave(&ep->lock, flags);
+ ep->freqm = f;
+ spin_unlock_irqrestore(&ep->lock, flags);
} else {
/*
* Out of range; maybe the shift value is wrong.
* Reset it so that we autodetect again the next time.
*/
- subs->freqshift = INT_MIN;
- }
-
- return 0;
-}
-
-/* determine the number of frames in the next packet */
-static int snd_usb_audio_next_packet_size(struct snd_usb_substream *subs)
-{
- if (subs->fill_max)
- return subs->maxframesize;
- else {
- subs->phase = (subs->phase & 0xffff)
- + (subs->freqm << subs->datainterval);
- return min(subs->phase >> 16, subs->maxframesize);
+ ep->freqshift = INT_MIN;
}
}
-/*
- * Prepare urb for streaming before playback starts or when paused.
- *
- * We don't have any data, so we send silence.
- */
-static int prepare_nodata_playback_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
-{
- unsigned int i, offs, counts;
- struct snd_urb_ctx *ctx = urb->context;
- int stride = runtime->frame_bits >> 3;
-
- offs = 0;
- urb->dev = ctx->subs->dev;
- for (i = 0; i < ctx->packets; ++i) {
- counts = snd_usb_audio_next_packet_size(subs);
- urb->iso_frame_desc[i].offset = offs * stride;
- urb->iso_frame_desc[i].length = counts * stride;
- offs += counts;
- }
- urb->number_of_packets = ctx->packets;
- urb->transfer_buffer_length = offs * stride;
- memset(urb->transfer_buffer,
- runtime->format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0,
- offs * stride);
- return 0;
-}
-
-/*
- * prepare urb for playback data pipe
- *
- * 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 int prepare_playback_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
-{
- int i, stride;
- unsigned int counts, frames, bytes;
- unsigned long flags;
- int period_elapsed = 0;
- struct snd_urb_ctx *ctx = urb->context;
-
- stride = runtime->frame_bits >> 3;
-
- frames = 0;
- urb->dev = ctx->subs->dev; /* we need to set this at each time */
- urb->number_of_packets = 0;
- spin_lock_irqsave(&subs->lock, flags);
- for (i = 0; i < ctx->packets; i++) {
- counts = snd_usb_audio_next_packet_size(subs);
- /* 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) /* 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;
-
- /* 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 */
-
- spin_unlock_irqrestore(&subs->lock, flags);
- urb->transfer_buffer_length = bytes;
- if (period_elapsed)
- snd_pcm_period_elapsed(subs->pcm_substream);
- return 0;
-}
-
-/*
- * process after playback data complete
- * - decrease the delay count again
- */
-static int retire_playback_urb(struct snd_usb_substream *subs,
- struct snd_pcm_runtime *runtime,
- struct urb *urb)
-{
- unsigned long flags;
- int stride = runtime->frame_bits >> 3;
- int processed = urb->transfer_buffer_length / stride;
- int est_delay;
-
- spin_lock_irqsave(&subs->lock, flags);
-
- 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)
- snd_printk(KERN_DEBUG "delay: estimated %d, actual %d\n",
- est_delay, subs->last_delay);
-
- spin_unlock_irqrestore(&subs->lock, flags);
- return 0;
-}
-
-static const char *usb_error_string(int err)
-{
- switch (err) {
- case -ENODEV:
- return "no device";
- case -ENOENT:
- return "endpoint not enabled";
- case -EPIPE:
- return "endpoint stalled";
- case -ENOSPC:
- return "not enough bandwidth";
- case -ESHUTDOWN:
- return "device disabled";
- case -EHOSTUNREACH:
- return "device suspended";
- case -EINVAL:
- case -EAGAIN:
- case -EFBIG:
- case -EMSGSIZE:
- return "internal error";
- default:
- return "unknown error";
- }
-}
-
-/*
- * set up and start data/sync urbs
- */
-static int start_urbs(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime)
-{
- unsigned int i;
- int err;
-
- if (subs->stream->chip->shutdown)
- return -EBADFD;
-
- for (i = 0; i < subs->nurbs; i++) {
- if (snd_BUG_ON(!subs->dataurb[i].urb))
- return -EINVAL;
- if (subs->ops.prepare(subs, runtime, subs->dataurb[i].urb) < 0) {
- snd_printk(KERN_ERR "cannot prepare datapipe for urb %d\n", i);
- goto __error;
- }
- }
- if (subs->syncpipe) {
- for (i = 0; i < SYNC_URBS; i++) {
- if (snd_BUG_ON(!subs->syncurb[i].urb))
- return -EINVAL;
- if (subs->ops.prepare_sync(subs, runtime, subs->syncurb[i].urb) < 0) {
- snd_printk(KERN_ERR "cannot prepare syncpipe for urb %d\n", i);
- goto __error;
- }
- }
- }
-
- subs->active_mask = 0;
- subs->unlink_mask = 0;
- subs->running = 1;
- for (i = 0; i < subs->nurbs; i++) {
- err = usb_submit_urb(subs->dataurb[i].urb, GFP_ATOMIC);
- if (err < 0) {
- snd_printk(KERN_ERR "cannot submit datapipe "
- "for urb %d, error %d: %s\n",
- i, err, usb_error_string(err));
- goto __error;
- }
- set_bit(i, &subs->active_mask);
- }
- if (subs->syncpipe) {
- for (i = 0; i < SYNC_URBS; i++) {
- err = usb_submit_urb(subs->syncurb[i].urb, GFP_ATOMIC);
- if (err < 0) {
- snd_printk(KERN_ERR "cannot submit syncpipe "
- "for urb %d, error %d: %s\n",
- i, err, usb_error_string(err));
- goto __error;
- }
- set_bit(i + 16, &subs->active_mask);
- }
- }
- return 0;
-
- __error:
- // snd_pcm_stop(subs->pcm_substream, SNDRV_PCM_STATE_XRUN);
- deactivate_urbs(subs, 0, 0);
- return -EPIPE;
-}
-
-
-/*
- */
-static struct snd_urb_ops audio_urb_ops[2] = {
- {
- .prepare = prepare_nodata_playback_urb,
- .retire = retire_playback_urb,
- .prepare_sync = prepare_playback_sync_urb,
- .retire_sync = retire_playback_sync_urb,
- },
- {
- .prepare = prepare_capture_urb,
- .retire = retire_capture_urb,
- .prepare_sync = prepare_capture_sync_urb,
- .retire_sync = retire_capture_sync_urb,
- },
-};
-
-/*
- * initialize the substream instance.
- */
-
-void snd_usb_init_substream(struct snd_usb_stream *as,
- int stream, struct audioformat *fp)
-{
- struct snd_usb_substream *subs = &as->substream[stream];
-
- INIT_LIST_HEAD(&subs->fmt_list);
- spin_lock_init(&subs->lock);
-
- subs->stream = as;
- subs->direction = stream;
- subs->dev = as->chip->dev;
- subs->txfr_quirk = as->chip->txfr_quirk;
- subs->ops = audio_urb_ops[stream];
- if (snd_usb_get_speed(subs->dev) >= USB_SPEED_HIGH)
- subs->ops.prepare_sync = prepare_capture_sync_urb_hs;
-
- snd_usb_set_pcm_ops(as->pcm, stream);
-
- list_add_tail(&fp->list, &subs->fmt_list);
- subs->formats |= fp->formats;
- subs->endpoint = fp->endpoint;
- subs->num_formats++;
- 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(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(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)
-{
- /* clear urbs (to be sure) */
- deactivate_urbs(subs, 0, 1);
- wait_clear_urbs(subs);
-
- /* 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) {
- subs->ops.prepare = prepare_nodata_playback_urb;
- return start_urbs(subs, runtime);
- }
-
- return 0;
-}
-