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Diffstat (limited to 'sound/usb/usbaudio.c')
-rw-r--r--sound/usb/usbaudio.c151
1 files changed, 65 insertions, 86 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index a703d96bfcb4..2b4f916a0a9a 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -41,6 +41,7 @@
#include <sound/driver.h>
#include <linux/bitops.h>
#include <linux/init.h>
+#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/string.h>
@@ -129,8 +130,6 @@ struct snd_urb_ctx {
snd_usb_substream_t *subs;
int index; /* index for urb array */
int packets; /* number of packets per urb */
- int transfer; /* transferred size */
- char *buf; /* buffer for capture */
};
struct snd_urb_ops {
@@ -168,9 +167,7 @@ struct snd_usb_substream {
unsigned int running: 1; /* running status */
- unsigned int hwptr; /* free frame position in the buffer (only for playback) */
unsigned int hwptr_done; /* processed frame position in the buffer */
- unsigned int transfer_sched; /* scheduled frames since last period (for playback) */
unsigned int transfer_done; /* processed frames since last period update */
unsigned long active_mask; /* bitmask of active urbs */
unsigned long unlink_mask; /* bitmask of unlinked urbs */
@@ -179,12 +176,12 @@ struct snd_usb_substream {
snd_urb_ctx_t dataurb[MAX_URBS]; /* data urb table */
snd_urb_ctx_t syncurb[SYNC_URBS]; /* sync urb table */
char syncbuf[SYNC_URBS * 4]; /* sync buffer; it's so small - let's get static */
- char *tmpbuf; /* temporary buffer for playback */
u64 formats; /* format bitmasks (all or'ed) */
unsigned int num_formats; /* number of supported audio formats (list) */
struct list_head fmt_list; /* format list */
spinlock_t lock;
+ struct tasklet_struct start_period_elapsed; /* for start trigger */
struct snd_urb_ops ops; /* callbacks (must be filled at init) */
};
@@ -320,7 +317,6 @@ static int prepare_capture_urb(snd_usb_substream_t *subs,
urb->iso_frame_desc[i].length = subs->curpacksize;
offs += subs->curpacksize;
}
- urb->transfer_buffer = ctx->buf;
urb->transfer_buffer_length = offs;
urb->number_of_packets = ctx->packets;
#if 0 // for check
@@ -482,12 +478,10 @@ static int retire_playback_sync_urb_hs(snd_usb_substream_t *subs,
/*
* prepare urb for playback data pipe
*
- * we copy the data directly from the pcm buffer.
- * the current position to be copied is held in hwptr field.
- * since a urb can handle only a single linear buffer, if the total
- * transferred area overflows the buffer boundary, we cannot send
- * it directly from the buffer. thus the data is once copied to
- * a temporary buffer and urb points to that.
+ * 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(snd_usb_substream_t *subs,
snd_pcm_runtime_t *runtime,
@@ -496,6 +490,7 @@ static int prepare_playback_urb(snd_usb_substream_t *subs,
int i, stride, offs;
unsigned int counts;
unsigned long flags;
+ int period_elapsed = 0;
snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
stride = runtime->frame_bits >> 3;
@@ -520,21 +515,25 @@ static int prepare_playback_urb(snd_usb_substream_t *subs,
urb->iso_frame_desc[i].length = counts * stride;
offs += counts;
urb->number_of_packets++;
- subs->transfer_sched += counts;
- if (subs->transfer_sched >= runtime->period_size) {
- subs->transfer_sched -= runtime->period_size;
+ subs->transfer_done += counts;
+ if (subs->transfer_done >= runtime->period_size) {
+ subs->transfer_done -= runtime->period_size;
+ period_elapsed = 1;
if (subs->fmt_type == USB_FORMAT_TYPE_II) {
- if (subs->transfer_sched > 0) {
- /* FIXME: fill-max mode is not supported yet */
- offs -= subs->transfer_sched;
- counts -= subs->transfer_sched;
- urb->iso_frame_desc[i].length = counts * stride;
- subs->transfer_sched = 0;
+ if (subs->transfer_done > 0) {
+ /* FIXME: fill-max mode is not
+ * supported yet */
+ offs -= 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 = offs * stride;
+ urb->iso_frame_desc[i].offset =
+ offs * stride;
urb->iso_frame_desc[i].length = 0;
urb->number_of_packets++;
}
@@ -542,58 +541,55 @@ static int prepare_playback_urb(snd_usb_substream_t *subs,
break;
}
}
- if (subs->hwptr + offs > runtime->buffer_size) {
- /* err, the transferred area goes over buffer boundary.
- * copy the data to the temp buffer.
- */
- int len;
- len = runtime->buffer_size - subs->hwptr;
- urb->transfer_buffer = subs->tmpbuf;
- memcpy(subs->tmpbuf, runtime->dma_area + subs->hwptr * stride, len * stride);
- memcpy(subs->tmpbuf + len * stride, runtime->dma_area, (offs - len) * stride);
- subs->hwptr += offs;
- subs->hwptr -= runtime->buffer_size;
+ if (subs->hwptr_done + offs > runtime->buffer_size) {
+ /* err, the transferred area goes over buffer boundary. */
+ unsigned int len = runtime->buffer_size - subs->hwptr_done;
+ memcpy(urb->transfer_buffer,
+ runtime->dma_area + subs->hwptr_done * stride,
+ len * stride);
+ memcpy(urb->transfer_buffer + len * stride,
+ runtime->dma_area,
+ (offs - len) * stride);
} else {
- /* set the buffer pointer */
- urb->transfer_buffer = runtime->dma_area + subs->hwptr * stride;
- subs->hwptr += offs;
- if (subs->hwptr == runtime->buffer_size)
- subs->hwptr = 0;
+ memcpy(urb->transfer_buffer,
+ runtime->dma_area + subs->hwptr_done * stride,
+ offs * stride);
}
+ subs->hwptr_done += offs;
+ if (subs->hwptr_done >= runtime->buffer_size)
+ subs->hwptr_done -= runtime->buffer_size;
spin_unlock_irqrestore(&subs->lock, flags);
urb->transfer_buffer_length = offs * stride;
- ctx->transfer = offs;
-
+ if (period_elapsed) {
+ if (likely(subs->running))
+ snd_pcm_period_elapsed(subs->pcm_substream);
+ else
+ tasklet_hi_schedule(&subs->start_period_elapsed);
+ }
return 0;
}
/*
* process after playback data complete
- *
- * update the current position and call callback if a period is processed.
+ * - nothing to do
*/
static int retire_playback_urb(snd_usb_substream_t *subs,
snd_pcm_runtime_t *runtime,
struct urb *urb)
{
- unsigned long flags;
- snd_urb_ctx_t *ctx = (snd_urb_ctx_t *)urb->context;
-
- spin_lock_irqsave(&subs->lock, flags);
- subs->transfer_done += ctx->transfer;
- subs->hwptr_done += ctx->transfer;
- ctx->transfer = 0;
- if (subs->hwptr_done >= runtime->buffer_size)
- subs->hwptr_done -= runtime->buffer_size;
- if (subs->transfer_done >= runtime->period_size) {
- subs->transfer_done -= runtime->period_size;
- spin_unlock_irqrestore(&subs->lock, flags);
- snd_pcm_period_elapsed(subs->pcm_substream);
- } else
- spin_unlock_irqrestore(&subs->lock, flags);
return 0;
}
+/*
+ * Delay the snd_pcm_period_elapsed() call until after the start trigger
+ * callback so that we're not longer in the substream's lock.
+ */
+static void start_period_elapsed(unsigned long data)
+{
+ snd_usb_substream_t *subs = (snd_usb_substream_t *)data;
+ snd_pcm_period_elapsed(subs->pcm_substream);
+}
+
/*
*/
@@ -848,11 +844,10 @@ static int snd_usb_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
static void release_urb_ctx(snd_urb_ctx_t *u)
{
if (u->urb) {
+ kfree(u->urb->transfer_buffer);
usb_free_urb(u->urb);
u->urb = NULL;
}
- kfree(u->buf);
- u->buf = NULL;
}
/*
@@ -870,8 +865,6 @@ static void release_substream_urbs(snd_usb_substream_t *subs, int force)
release_urb_ctx(&subs->dataurb[i]);
for (i = 0; i < SYNC_URBS; i++)
release_urb_ctx(&subs->syncurb[i]);
- kfree(subs->tmpbuf);
- subs->tmpbuf = NULL;
subs->nurbs = 0;
}
@@ -923,24 +916,15 @@ static int init_substream_urbs(snd_usb_substream_t *subs, unsigned int period_by
urb_packs = 1;
urb_packs *= packs_per_ms;
- /* allocate a temporary buffer for playback */
- if (is_playback) {
- subs->tmpbuf = kmalloc(maxsize * urb_packs, GFP_KERNEL);
- if (! subs->tmpbuf) {
- snd_printk(KERN_ERR "cannot malloc tmpbuf\n");
- return -ENOMEM;
- }
- }
-
/* decide how many packets to be used */
if (is_playback) {
unsigned int minsize;
/* determine how small a packet can be */
minsize = (subs->freqn >> (16 - subs->datainterval))
* (frame_bits >> 3);
- /* with sync from device, assume it can be 25% lower */
+ /* with sync from device, assume it can be 12% lower */
if (subs->syncpipe)
- minsize -= minsize >> 2;
+ minsize -= minsize >> 3;
minsize = max(minsize, 1u);
total_packs = (period_bytes + minsize - 1) / minsize;
/* round up to multiple of packs_per_ms */
@@ -989,27 +973,22 @@ static int init_substream_urbs(snd_usb_substream_t *subs, unsigned int period_by
snd_urb_ctx_t *u = &subs->dataurb[i];
u->index = i;
u->subs = subs;
- u->transfer = 0;
u->packets = npacks[i];
if (subs->fmt_type == USB_FORMAT_TYPE_II)
u->packets++; /* for transfer delimiter */
- if (! is_playback) {
- /* allocate a capture buffer per urb */
- u->buf = kmalloc(maxsize * u->packets, GFP_KERNEL);
- if (! u->buf) {
- release_substream_urbs(subs, 0);
- return -ENOMEM;
- }
- }
u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
if (! u->urb) {
release_substream_urbs(subs, 0);
return -ENOMEM;
}
- u->urb->dev = subs->dev;
+ u->urb->transfer_buffer = kmalloc(maxsize * u->packets,
+ GFP_KERNEL);
+ if (! u->urb->transfer_buffer) {
+ release_substream_urbs(subs, 0);
+ return -ENOMEM;
+ }
u->urb->pipe = subs->datapipe;
u->urb->transfer_flags = URB_ISO_ASAP;
- u->urb->number_of_packets = u->packets;
u->urb->interval = 1 << subs->datainterval;
u->urb->context = u;
u->urb->complete = snd_usb_complete_callback(snd_complete_urb);
@@ -1029,7 +1008,6 @@ static int init_substream_urbs(snd_usb_substream_t *subs, unsigned int period_by
}
u->urb->transfer_buffer = subs->syncbuf + i * 4;
u->urb->transfer_buffer_length = 4;
- u->urb->dev = subs->dev;
u->urb->pipe = subs->syncpipe;
u->urb->transfer_flags = URB_ISO_ASAP;
u->urb->number_of_packets = 1;
@@ -1386,9 +1364,7 @@ static int snd_usb_pcm_prepare(snd_pcm_substream_t *substream)
subs->curframesize = bytes_to_frames(runtime, subs->curpacksize);
/* reset the pointer */
- subs->hwptr = 0;
subs->hwptr_done = 0;
- subs->transfer_sched = 0;
subs->transfer_done = 0;
subs->phase = 0;
@@ -2035,6 +2011,9 @@ static void init_substream(snd_usb_stream_t *as, int stream, struct audioformat
INIT_LIST_HEAD(&subs->fmt_list);
spin_lock_init(&subs->lock);
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK)
+ tasklet_init(&subs->start_period_elapsed, start_period_elapsed,
+ (unsigned long)subs);
subs->stream = as;
subs->direction = stream;