diff options
Diffstat (limited to 'sound/usb/usbaudio.c')
| -rw-r--r-- | sound/usb/usbaudio.c | 100 |
1 files changed, 62 insertions, 38 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c index 8818918c423..99dae024b64 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; |