mirror of https://gitee.com/openkylin/linux.git
ALSA: snd-usb: remove old streaming logic
Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Daniel Mack
Takashi Iwai
parent
edcd3633e7
commit
d399ff9593
|
|
@ -53,728 +53,17 @@ static inline unsigned get_usb_high_speed_rate(unsigned int rate)
|
|||
return ((rate << 10) + 62) / 125;
|
||||
}
|
||||
|
||||
/*
|
||||
* unlink active urbs.
|
||||
*/
|
||||
static int deactivate_urbs_old(struct snd_usb_substream *subs, int force, int can_sleep)
|
||||
{
|
||||
struct snd_usb_audio *chip = subs->stream->chip;
|
||||
unsigned int i;
|
||||
int async;
|
||||
|
||||
subs->running = 0;
|
||||
|
||||
if (!force && subs->stream->chip->shutdown) /* to be sure... */
|
||||
return -EBADFD;
|
||||
|
||||
async = !can_sleep && chip->async_unlink;
|
||||
|
||||
if (!async && in_interrupt())
|
||||
return 0;
|
||||
|
||||
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);
|
||||
}
|
||||
}
|
||||
}
|
||||
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);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* release a urb data
|
||||
*/
|
||||
static void release_urb_ctx(struct snd_urb_ctx *u)
|
||||
{
|
||||
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;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* wait until all urbs are processed.
|
||||
*/
|
||||
static int wait_clear_urbs_old(struct snd_usb_substream *subs)
|
||||
{
|
||||
unsigned long end_time = jiffies + msecs_to_jiffies(1000);
|
||||
unsigned int i;
|
||||
int alive;
|
||||
|
||||
do {
|
||||
alive = 0;
|
||||
for (i = 0; i < subs->nurbs; i++) {
|
||||
if (test_bit(i, &subs->active_mask))
|
||||
alive++;
|
||||
}
|
||||
if (subs->syncpipe) {
|
||||
for (i = 0; i < SYNC_URBS; i++) {
|
||||
if (test_bit(i + 16, &subs->active_mask))
|
||||
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);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* release a substream
|
||||
*/
|
||||
void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force)
|
||||
{
|
||||
int i;
|
||||
|
||||
/* stop urbs (to be sure) */
|
||||
deactivate_urbs_old(subs, force, 1);
|
||||
wait_clear_urbs_old(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;
|
||||
}
|
||||
|
||||
/*
|
||||
* complete callback from data urb
|
||||
*/
|
||||
static void snd_complete_urb_old(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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* complete callback from sync urb
|
||||
*/
|
||||
static void snd_complete_sync_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_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);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* initialize a substream for plaback/capture
|
||||
*/
|
||||
int snd_usb_init_substream_urbs(struct snd_usb_substream *subs,
|
||||
unsigned int period_bytes,
|
||||
unsigned int rate,
|
||||
unsigned int frame_bits)
|
||||
{
|
||||
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;
|
||||
|
||||
/* 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) {
|
||||
/* whatever fits into a max. size packet */
|
||||
maxsize = subs->maxpacksize;
|
||||
subs->freqmax = (maxsize / (frame_bits >> 3))
|
||||
<< (16 - subs->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);
|
||||
}
|
||||
subs->phase = 0;
|
||||
|
||||
if (subs->fill_max)
|
||||
subs->curpacksize = subs->maxpacksize;
|
||||
else
|
||||
subs->curpacksize = maxsize;
|
||||
|
||||
if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL)
|
||||
packs_per_ms = 8 >> subs->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
|
||||
urb_packs = 1;
|
||||
urb_packs *= packs_per_ms;
|
||||
if (subs->syncpipe)
|
||||
urb_packs = min(urb_packs, 1U << subs->syncinterval);
|
||||
|
||||
/* decide how many packets to be used */
|
||||
if (is_playback) {
|
||||
unsigned int minsize, maxpacks;
|
||||
/* determine how small a packet can be */
|
||||
minsize = (subs->freqn >> (16 - subs->datainterval))
|
||||
* (frame_bits >> 3);
|
||||
/* with sync from device, assume it can be 12% lower */
|
||||
if (subs->syncpipe)
|
||||
minsize -= minsize >> 3;
|
||||
minsize = max(minsize, 1u);
|
||||
total_packs = (period_bytes + minsize - 1) / minsize;
|
||||
/* we need at least two URBs for queueing */
|
||||
if (total_packs < 2) {
|
||||
total_packs = 2;
|
||||
} else {
|
||||
/* and we don't want too long a queue either */
|
||||
maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
|
||||
total_packs = min(total_packs, maxpacks);
|
||||
}
|
||||
} else {
|
||||
while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
|
||||
urb_packs >>= 1;
|
||||
total_packs = MAX_URBS * urb_packs;
|
||||
}
|
||||
subs->nurbs = (total_packs + urb_packs - 1) / urb_packs;
|
||||
if (subs->nurbs > MAX_URBS) {
|
||||
/* too much... */
|
||||
subs->nurbs = MAX_URBS;
|
||||
total_packs = MAX_URBS * urb_packs;
|
||||
} else if (subs->nurbs < 2) {
|
||||
/* too little - we need at least two packets
|
||||
* to ensure contiguous playback/capture
|
||||
*/
|
||||
subs->nurbs = 2;
|
||||
}
|
||||
|
||||
/* allocate and initialize data urbs */
|
||||
for (i = 0; i < subs->nurbs; i++) {
|
||||
struct snd_urb_ctx *u = &subs->dataurb[i];
|
||||
u->index = i;
|
||||
u->subs = subs;
|
||||
u->packets = (i + 1) * total_packs / subs->nurbs
|
||||
- i * total_packs / subs->nurbs;
|
||||
u->buffer_size = maxsize * u->packets;
|
||||
if (subs->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,
|
||||
GFP_KERNEL, &u->urb->transfer_dma);
|
||||
if (!u->urb->transfer_buffer)
|
||||
goto out_of_memory;
|
||||
u->urb->pipe = subs->datapipe;
|
||||
u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
|
||||
u->urb->interval = 1 << subs->datainterval;
|
||||
u->urb->context = u;
|
||||
u->urb->complete = snd_complete_urb_old;
|
||||
}
|
||||
|
||||
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);
|
||||
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.
|
||||
*/
|
||||
static int prepare_capture_sync_urb(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime,
|
||||
struct urb *urb)
|
||||
{
|
||||
unsigned char *cp = urb->transfer_buffer;
|
||||
struct snd_urb_ctx *ctx = urb->context;
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
/*
|
||||
* prepare urb for high speed capture sync pipe
|
||||
*
|
||||
* fill the length and offset of each urb descriptor.
|
||||
* the fixed 12.13 frequency is passed as 16.16 through the pipe.
|
||||
*/
|
||||
static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime,
|
||||
struct urb *urb)
|
||||
{
|
||||
unsigned char *cp = urb->transfer_buffer;
|
||||
struct snd_urb_ctx *ctx = urb->context;
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
/*
|
||||
* process after capture sync complete
|
||||
* - nothing to do
|
||||
*/
|
||||
static int retire_capture_sync_urb(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime,
|
||||
struct urb *urb)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* prepare urb for capture data pipe
|
||||
*
|
||||
* fill the offset and length of each descriptor.
|
||||
*
|
||||
* 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.
|
||||
*/
|
||||
static int prepare_capture_urb(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime,
|
||||
struct urb *urb)
|
||||
{
|
||||
int i, offs;
|
||||
struct snd_urb_ctx *ctx = urb->context;
|
||||
|
||||
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;
|
||||
}
|
||||
urb->transfer_buffer_length = offs;
|
||||
urb->number_of_packets = ctx->packets;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* process after capture complete
|
||||
*
|
||||
* copy the data from each desctiptor to the pcm buffer, and
|
||||
* update the current position.
|
||||
*/
|
||||
static int retire_capture_urb(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime,
|
||||
struct urb *urb)
|
||||
{
|
||||
unsigned long flags;
|
||||
unsigned char *cp;
|
||||
int i;
|
||||
unsigned int stride, frames, bytes, oldptr;
|
||||
int period_elapsed = 0;
|
||||
|
||||
stride = runtime->frame_bits >> 3;
|
||||
|
||||
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);
|
||||
}
|
||||
}
|
||||
if (period_elapsed)
|
||||
snd_pcm_period_elapsed(subs->pcm_substream);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Process after capture complete when paused. Nothing to do.
|
||||
*/
|
||||
static int retire_paused_capture_urb(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime,
|
||||
struct urb *urb)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* prepare urb for playback sync pipe
|
||||
*
|
||||
* set up the offset and length to receive the current frequency.
|
||||
*/
|
||||
static int prepare_playback_sync_urb(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime,
|
||||
struct urb *urb)
|
||||
{
|
||||
struct snd_urb_ctx *ctx = urb->context;
|
||||
|
||||
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;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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.
|
||||
*/
|
||||
static int retire_playback_sync_urb(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime,
|
||||
struct urb *urb)
|
||||
{
|
||||
unsigned int f;
|
||||
int shift;
|
||||
unsigned long flags;
|
||||
|
||||
if (urb->iso_frame_desc[0].status != 0 ||
|
||||
urb->iso_frame_desc[0].actual_length < 3)
|
||||
return 0;
|
||||
|
||||
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;
|
||||
|
||||
if (unlikely(subs->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
|
||||
* frequency value. This assumes that the feedback does not
|
||||
* differ from the nominal value more than +50% or -25%.
|
||||
*/
|
||||
shift = 0;
|
||||
while (f < subs->freqn - subs->freqn / 4) {
|
||||
f <<= 1;
|
||||
shift++;
|
||||
}
|
||||
while (f > subs->freqn + subs->freqn / 2) {
|
||||
f >>= 1;
|
||||
shift--;
|
||||
}
|
||||
subs->freqshift = shift;
|
||||
}
|
||||
else if (subs->freqshift >= 0)
|
||||
f <<= subs->freqshift;
|
||||
else
|
||||
f >>= -subs->freqshift;
|
||||
|
||||
if (likely(f >= subs->freqn - subs->freqn / 8 && f <= subs->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);
|
||||
} 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);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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;
|
||||
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)
|
||||
|
|
@ -802,133 +91,6 @@ static const char *usb_error_string(int err)
|
|||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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_old(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_prepare(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime)
|
||||
{
|
||||
/* clear urbs (to be sure) */
|
||||
deactivate_urbs_old(subs, 0, 1);
|
||||
wait_clear_urbs_old(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;
|
||||
}
|
||||
|
||||
int snd_usb_endpoint_implict_feedback_sink(struct snd_usb_endpoint *ep)
|
||||
{
|
||||
return ep->sync_master &&
|
||||
|
|
|
|||
|
|
@ -1,21 +1,6 @@
|
|||
#ifndef __USBAUDIO_ENDPOINT_H
|
||||
#define __USBAUDIO_ENDPOINT_H
|
||||
|
||||
void snd_usb_init_substream(struct snd_usb_stream *as,
|
||||
int stream,
|
||||
struct audioformat *fp);
|
||||
|
||||
int snd_usb_init_substream_urbs(struct snd_usb_substream *subs,
|
||||
unsigned int period_bytes,
|
||||
unsigned int rate,
|
||||
unsigned int frame_bits);
|
||||
|
||||
void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force);
|
||||
|
||||
int snd_usb_substream_prepare(struct snd_usb_substream *subs,
|
||||
struct snd_pcm_runtime *runtime);
|
||||
|
||||
|
||||
#define SND_USB_ENDPOINT_TYPE_DATA 0
|
||||
#define SND_USB_ENDPOINT_TYPE_SYNC 1
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue