diff options
Diffstat (limited to 'sound/usb')
-rw-r--r-- | sound/usb/usbaudio.c | 151 |
1 files changed, 65 insertions, 86 deletions
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c index a703d96bfcb..2b4f916a0a9 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; |