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Diffstat (limited to 'sound/usb/usbaudio.c')
-rw-r--r--sound/usb/usbaudio.c100
1 files changed, 62 insertions, 38 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 8818918..99dae02 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -41,7 +41,6 @@
#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>
@@ -185,7 +184,6 @@ struct snd_usb_substream {
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) */
};
@@ -480,6 +478,28 @@ static int retire_playback_sync_urb_hs(snd_usb_substream_t *subs,
}
/*
+ * Prepare urb for streaming before playback starts.
+ *
+ * We don't care about (or have) any data, so we just send a transfer delimiter.
+ */
+static int prepare_startup_playback_urb(snd_usb_substream_t *subs,
+ snd_pcm_runtime_t *runtime,
+ struct urb *urb)
+{
+ unsigned int i;
+ snd_urb_ctx_t *ctx = urb->context;
+
+ urb->dev = ctx->subs->dev;
+ urb->number_of_packets = subs->packs_per_ms;
+ for (i = 0; i < subs->packs_per_ms; ++i) {
+ urb->iso_frame_desc[i].offset = 0;
+ urb->iso_frame_desc[i].length = 0;
+ }
+ urb->transfer_buffer_length = 0;
+ return 0;
+}
+
+/*
* prepare urb for playback data pipe
*
* Since a URB can handle only a single linear buffer, we must use double
@@ -568,12 +588,8 @@ static int prepare_playback_urb(snd_usb_substream_t *subs,
subs->hwptr_done -= runtime->buffer_size;
spin_unlock_irqrestore(&subs->lock, flags);
urb->transfer_buffer_length = offs * stride;
- if (period_elapsed) {
- if (likely(subs->running))
- snd_pcm_period_elapsed(subs->pcm_substream);
- else
- tasklet_hi_schedule(&subs->start_period_elapsed);
- }
+ if (period_elapsed)
+ snd_pcm_period_elapsed(subs->pcm_substream);
return 0;
}
@@ -588,22 +604,12 @@ static int retire_playback_urb(snd_usb_substream_t *subs,
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);
-}
-
/*
*/
static struct snd_urb_ops audio_urb_ops[2] = {
{
- .prepare = prepare_playback_urb,
+ .prepare = prepare_startup_playback_urb,
.retire = retire_playback_urb,
.prepare_sync = prepare_playback_sync_urb,
.retire_sync = retire_playback_sync_urb,
@@ -618,7 +624,7 @@ static struct snd_urb_ops audio_urb_ops[2] = {
static struct snd_urb_ops audio_urb_ops_high_speed[2] = {
{
- .prepare = prepare_playback_urb,
+ .prepare = prepare_startup_playback_urb,
.retire = retire_playback_urb,
.prepare_sync = prepare_playback_sync_urb_hs,
.retire_sync = retire_playback_sync_urb_hs,
@@ -863,25 +869,40 @@ static snd_pcm_uframes_t snd_usb_pcm_pointer(snd_pcm_substream_t *substream)
/*
- * start/stop substream
+ * start/stop playback substream
*/
-static int snd_usb_pcm_trigger(snd_pcm_substream_t *substream, int cmd)
+static int snd_usb_pcm_playback_trigger(snd_pcm_substream_t *substream,
+ int cmd)
{
- snd_usb_substream_t *subs = (snd_usb_substream_t *)substream->runtime->private_data;
- int err;
+ snd_usb_substream_t *subs = substream->runtime->private_data;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
- err = start_urbs(subs, substream->runtime);
- break;
+ subs->ops.prepare = prepare_playback_urb;
+ return 0;
case SNDRV_PCM_TRIGGER_STOP:
- err = deactivate_urbs(subs, 0, 0);
- break;
+ return deactivate_urbs(subs, 0, 0);
default:
- err = -EINVAL;
- break;
+ return -EINVAL;
+ }
+}
+
+/*
+ * start/stop capture substream
+ */
+static int snd_usb_pcm_capture_trigger(snd_pcm_substream_t *substream,
+ int cmd)
+{
+ snd_usb_substream_t *subs = substream->runtime->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ return start_urbs(subs, substream->runtime);
+ case SNDRV_PCM_TRIGGER_STOP:
+ return deactivate_urbs(subs, 0, 0);
+ default:
+ return -EINVAL;
}
- return err < 0 ? err : 0;
}
@@ -1413,7 +1434,7 @@ static int snd_usb_hw_free(snd_pcm_substream_t *substream)
static int snd_usb_pcm_prepare(snd_pcm_substream_t *substream)
{
snd_pcm_runtime_t *runtime = substream->runtime;
- snd_usb_substream_t *subs = (snd_usb_substream_t *)runtime->private_data;
+ snd_usb_substream_t *subs = runtime->private_data;
if (! subs->cur_audiofmt) {
snd_printk(KERN_ERR "usbaudio: no format is specified!\n");
@@ -1433,7 +1454,13 @@ static int snd_usb_pcm_prepare(snd_pcm_substream_t *substream)
deactivate_urbs(subs, 0, 1);
wait_clear_urbs(subs);
- return 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) {
+ subs->ops.prepare = prepare_startup_playback_urb;
+ return start_urbs(subs, runtime);
+ } else
+ return 0;
}
static snd_pcm_hardware_t snd_usb_playback =
@@ -1847,7 +1874,7 @@ static snd_pcm_ops_t snd_usb_playback_ops = {
.hw_params = snd_usb_hw_params,
.hw_free = snd_usb_hw_free,
.prepare = snd_usb_pcm_prepare,
- .trigger = snd_usb_pcm_trigger,
+ .trigger = snd_usb_pcm_playback_trigger,
.pointer = snd_usb_pcm_pointer,
.page = snd_pcm_get_vmalloc_page,
};
@@ -1859,7 +1886,7 @@ static snd_pcm_ops_t snd_usb_capture_ops = {
.hw_params = snd_usb_hw_params,
.hw_free = snd_usb_hw_free,
.prepare = snd_usb_pcm_prepare,
- .trigger = snd_usb_pcm_trigger,
+ .trigger = snd_usb_pcm_capture_trigger,
.pointer = snd_usb_pcm_pointer,
.page = snd_pcm_get_vmalloc_page,
};
@@ -2078,9 +2105,6 @@ 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;
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