966 lines
26 KiB
C
966 lines
26 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/usb.h>
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#include <linux/usb/audio.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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#include "usbaudio.h"
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#include "helper.h"
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#include "card.h"
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#include "urb.h"
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#include "pcm.h"
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/*
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* convert a sampling rate into our full speed format (fs/1000 in Q16.16)
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* this will overflow at approx 524 kHz
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*/
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static inline unsigned get_usb_full_speed_rate(unsigned int rate)
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{
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return ((rate << 13) + 62) / 125;
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}
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/*
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* convert a sampling rate into USB high speed format (fs/8000 in Q16.16)
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* this will overflow at approx 4 MHz
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*/
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static inline unsigned get_usb_high_speed_rate(unsigned int rate)
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{
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return ((rate << 10) + 62) / 125;
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}
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/*
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* unlink active urbs.
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*/
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static int deactivate_urbs(struct snd_usb_substream *subs, int force, int can_sleep)
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{
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struct snd_usb_audio *chip = subs->stream->chip;
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unsigned int i;
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int async;
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subs->running = 0;
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if (!force && subs->stream->chip->shutdown) /* to be sure... */
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return -EBADFD;
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async = !can_sleep && chip->async_unlink;
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if (!async && in_interrupt())
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return 0;
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for (i = 0; i < subs->nurbs; i++) {
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if (test_bit(i, &subs->active_mask)) {
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if (!test_and_set_bit(i, &subs->unlink_mask)) {
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struct urb *u = subs->dataurb[i].urb;
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if (async)
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usb_unlink_urb(u);
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else
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usb_kill_urb(u);
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}
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}
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}
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if (subs->syncpipe) {
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for (i = 0; i < SYNC_URBS; i++) {
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if (test_bit(i+16, &subs->active_mask)) {
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if (!test_and_set_bit(i+16, &subs->unlink_mask)) {
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struct urb *u = subs->syncurb[i].urb;
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if (async)
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usb_unlink_urb(u);
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else
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usb_kill_urb(u);
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}
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}
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}
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}
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return 0;
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}
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/*
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* release a urb data
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*/
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static void release_urb_ctx(struct snd_urb_ctx *u)
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{
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if (u->urb) {
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if (u->buffer_size)
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usb_free_coherent(u->subs->dev, u->buffer_size,
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u->urb->transfer_buffer,
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u->urb->transfer_dma);
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usb_free_urb(u->urb);
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u->urb = NULL;
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}
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}
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/*
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* wait until all urbs are processed.
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*/
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static int wait_clear_urbs(struct snd_usb_substream *subs)
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{
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unsigned long end_time = jiffies + msecs_to_jiffies(1000);
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unsigned int i;
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int alive;
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do {
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alive = 0;
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for (i = 0; i < subs->nurbs; i++) {
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if (test_bit(i, &subs->active_mask))
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alive++;
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}
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if (subs->syncpipe) {
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for (i = 0; i < SYNC_URBS; i++) {
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if (test_bit(i + 16, &subs->active_mask))
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alive++;
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}
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}
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if (! alive)
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break;
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schedule_timeout_uninterruptible(1);
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} while (time_before(jiffies, end_time));
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if (alive)
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snd_printk(KERN_ERR "timeout: still %d active urbs..\n", alive);
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return 0;
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}
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/*
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* release a substream
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*/
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void snd_usb_release_substream_urbs(struct snd_usb_substream *subs, int force)
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{
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int i;
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/* stop urbs (to be sure) */
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deactivate_urbs(subs, force, 1);
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wait_clear_urbs(subs);
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for (i = 0; i < MAX_URBS; i++)
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release_urb_ctx(&subs->dataurb[i]);
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for (i = 0; i < SYNC_URBS; i++)
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release_urb_ctx(&subs->syncurb[i]);
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usb_free_coherent(subs->dev, SYNC_URBS * 4,
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subs->syncbuf, subs->sync_dma);
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subs->syncbuf = NULL;
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subs->nurbs = 0;
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}
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/*
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* complete callback from data urb
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*/
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static void snd_complete_urb(struct urb *urb)
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{
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struct snd_urb_ctx *ctx = urb->context;
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struct snd_usb_substream *subs = ctx->subs;
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struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
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int err = 0;
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if ((subs->running && subs->ops.retire(subs, substream->runtime, urb)) ||
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!subs->running || /* can be stopped during retire callback */
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(err = subs->ops.prepare(subs, substream->runtime, urb)) < 0 ||
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(err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
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clear_bit(ctx->index, &subs->active_mask);
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if (err < 0) {
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snd_printd(KERN_ERR "cannot submit urb (err = %d)\n", err);
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snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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}
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}
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}
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/*
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* complete callback from sync urb
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*/
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static void snd_complete_sync_urb(struct urb *urb)
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{
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struct snd_urb_ctx *ctx = urb->context;
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struct snd_usb_substream *subs = ctx->subs;
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struct snd_pcm_substream *substream = ctx->subs->pcm_substream;
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int err = 0;
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if ((subs->running && subs->ops.retire_sync(subs, substream->runtime, urb)) ||
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!subs->running || /* can be stopped during retire callback */
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(err = subs->ops.prepare_sync(subs, substream->runtime, urb)) < 0 ||
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(err = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
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clear_bit(ctx->index + 16, &subs->active_mask);
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if (err < 0) {
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snd_printd(KERN_ERR "cannot submit sync urb (err = %d)\n", err);
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snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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}
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}
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}
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/*
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* initialize a substream for plaback/capture
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*/
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int snd_usb_init_substream_urbs(struct snd_usb_substream *subs,
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unsigned int period_bytes,
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unsigned int rate,
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unsigned int frame_bits)
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{
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unsigned int maxsize, i;
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int is_playback = subs->direction == SNDRV_PCM_STREAM_PLAYBACK;
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unsigned int urb_packs, total_packs, packs_per_ms;
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struct snd_usb_audio *chip = subs->stream->chip;
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/* calculate the frequency in 16.16 format */
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if (snd_usb_get_speed(subs->dev) == USB_SPEED_FULL)
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subs->freqn = get_usb_full_speed_rate(rate);
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else
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subs->freqn = get_usb_high_speed_rate(rate);
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subs->freqm = subs->freqn;
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subs->freqshift = INT_MIN;
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/* calculate max. frequency */
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if (subs->maxpacksize) {
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/* whatever fits into a max. size packet */
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maxsize = subs->maxpacksize;
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subs->freqmax = (maxsize / (frame_bits >> 3))
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<< (16 - subs->datainterval);
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} else {
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/* no max. packet size: just take 25% higher than nominal */
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subs->freqmax = subs->freqn + (subs->freqn >> 2);
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maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3))
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>> (16 - subs->datainterval);
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}
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subs->phase = 0;
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if (subs->fill_max)
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subs->curpacksize = subs->maxpacksize;
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else
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subs->curpacksize = maxsize;
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if (snd_usb_get_speed(subs->dev) != USB_SPEED_FULL)
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packs_per_ms = 8 >> subs->datainterval;
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else
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packs_per_ms = 1;
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if (is_playback) {
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urb_packs = max(chip->nrpacks, 1);
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urb_packs = min(urb_packs, (unsigned int)MAX_PACKS);
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} else
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urb_packs = 1;
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urb_packs *= packs_per_ms;
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if (subs->syncpipe)
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urb_packs = min(urb_packs, 1U << subs->syncinterval);
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/* decide how many packets to be used */
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if (is_playback) {
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unsigned int minsize, maxpacks;
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/* determine how small a packet can be */
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minsize = (subs->freqn >> (16 - subs->datainterval))
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* (frame_bits >> 3);
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/* with sync from device, assume it can be 12% lower */
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if (subs->syncpipe)
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minsize -= minsize >> 3;
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minsize = max(minsize, 1u);
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total_packs = (period_bytes + minsize - 1) / minsize;
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/* we need at least two URBs for queueing */
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if (total_packs < 2) {
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total_packs = 2;
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} else {
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/* and we don't want too long a queue either */
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maxpacks = max(MAX_QUEUE * packs_per_ms, urb_packs * 2);
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total_packs = min(total_packs, maxpacks);
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}
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} else {
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while (urb_packs > 1 && urb_packs * maxsize >= period_bytes)
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urb_packs >>= 1;
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total_packs = MAX_URBS * urb_packs;
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}
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subs->nurbs = (total_packs + urb_packs - 1) / urb_packs;
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if (subs->nurbs > MAX_URBS) {
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/* too much... */
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subs->nurbs = MAX_URBS;
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total_packs = MAX_URBS * urb_packs;
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} else if (subs->nurbs < 2) {
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/* too little - we need at least two packets
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* to ensure contiguous playback/capture
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*/
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subs->nurbs = 2;
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}
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/* allocate and initialize data urbs */
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for (i = 0; i < subs->nurbs; i++) {
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struct snd_urb_ctx *u = &subs->dataurb[i];
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u->index = i;
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u->subs = subs;
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u->packets = (i + 1) * total_packs / subs->nurbs
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- i * total_packs / subs->nurbs;
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u->buffer_size = maxsize * u->packets;
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if (subs->fmt_type == UAC_FORMAT_TYPE_II)
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u->packets++; /* for transfer delimiter */
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u->urb = usb_alloc_urb(u->packets, GFP_KERNEL);
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if (!u->urb)
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goto out_of_memory;
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u->urb->transfer_buffer =
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usb_alloc_coherent(subs->dev, u->buffer_size,
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GFP_KERNEL, &u->urb->transfer_dma);
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if (!u->urb->transfer_buffer)
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goto out_of_memory;
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u->urb->pipe = subs->datapipe;
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u->urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
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u->urb->interval = 1 << subs->datainterval;
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u->urb->context = u;
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u->urb->complete = snd_complete_urb;
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}
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if (subs->syncpipe) {
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/* allocate and initialize sync urbs */
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subs->syncbuf = usb_alloc_coherent(subs->dev, SYNC_URBS * 4,
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GFP_KERNEL, &subs->sync_dma);
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if (!subs->syncbuf)
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goto out_of_memory;
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for (i = 0; i < SYNC_URBS; i++) {
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struct snd_urb_ctx *u = &subs->syncurb[i];
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u->index = i;
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u->subs = subs;
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u->packets = 1;
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u->urb = usb_alloc_urb(1, GFP_KERNEL);
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if (!u->urb)
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goto out_of_memory;
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u->urb->transfer_buffer = subs->syncbuf + i * 4;
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u->urb->transfer_dma = subs->sync_dma + i * 4;
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u->urb->transfer_buffer_length = 4;
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u->urb->pipe = subs->syncpipe;
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u->urb->transfer_flags = URB_ISO_ASAP |
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URB_NO_TRANSFER_DMA_MAP;
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u->urb->number_of_packets = 1;
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u->urb->interval = 1 << subs->syncinterval;
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u->urb->context = u;
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u->urb->complete = snd_complete_sync_urb;
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}
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}
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return 0;
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out_of_memory:
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snd_usb_release_substream_urbs(subs, 0);
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return -ENOMEM;
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}
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/*
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* prepare urb for full speed capture sync pipe
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*
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* fill the length and offset of each urb descriptor.
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* the fixed 10.14 frequency is passed through the pipe.
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*/
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static int prepare_capture_sync_urb(struct snd_usb_substream *subs,
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struct snd_pcm_runtime *runtime,
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struct urb *urb)
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{
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unsigned char *cp = urb->transfer_buffer;
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struct snd_urb_ctx *ctx = urb->context;
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urb->dev = ctx->subs->dev; /* we need to set this at each time */
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urb->iso_frame_desc[0].length = 3;
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urb->iso_frame_desc[0].offset = 0;
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cp[0] = subs->freqn >> 2;
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cp[1] = subs->freqn >> 10;
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cp[2] = subs->freqn >> 18;
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return 0;
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}
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/*
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* prepare urb for high speed capture sync pipe
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*
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* fill the length and offset of each urb descriptor.
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* the fixed 12.13 frequency is passed as 16.16 through the pipe.
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*/
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static int prepare_capture_sync_urb_hs(struct snd_usb_substream *subs,
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struct snd_pcm_runtime *runtime,
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struct urb *urb)
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{
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unsigned char *cp = urb->transfer_buffer;
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struct snd_urb_ctx *ctx = urb->context;
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urb->dev = ctx->subs->dev; /* we need to set this at each time */
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urb->iso_frame_desc[0].length = 4;
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urb->iso_frame_desc[0].offset = 0;
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cp[0] = subs->freqn;
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cp[1] = subs->freqn >> 8;
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cp[2] = subs->freqn >> 16;
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cp[3] = subs->freqn >> 24;
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return 0;
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}
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/*
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* process after capture sync complete
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* - nothing to do
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*/
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static int retire_capture_sync_urb(struct snd_usb_substream *subs,
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struct snd_pcm_runtime *runtime,
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struct urb *urb)
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{
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return 0;
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}
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/*
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* prepare urb for capture data pipe
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*
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* fill the offset and length of each descriptor.
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*
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* we use a temporary buffer to write the captured data.
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* since the length of written data is determined by host, we cannot
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* write onto the pcm buffer directly... the data is thus copied
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* later at complete callback to the global buffer.
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*/
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static int prepare_capture_urb(struct snd_usb_substream *subs,
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struct snd_pcm_runtime *runtime,
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struct urb *urb)
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{
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int i, offs;
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struct snd_urb_ctx *ctx = urb->context;
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offs = 0;
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urb->dev = ctx->subs->dev; /* we need to set this at each time */
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for (i = 0; i < ctx->packets; i++) {
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urb->iso_frame_desc[i].offset = offs;
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urb->iso_frame_desc[i].length = subs->curpacksize;
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offs += subs->curpacksize;
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}
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urb->transfer_buffer_length = offs;
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urb->number_of_packets = ctx->packets;
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return 0;
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}
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/*
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* process after capture complete
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*
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* copy the data from each desctiptor to the pcm buffer, and
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* update the current position.
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*/
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static int retire_capture_urb(struct snd_usb_substream *subs,
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struct snd_pcm_runtime *runtime,
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struct urb *urb)
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{
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unsigned long flags;
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unsigned char *cp;
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int i;
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unsigned int stride, frames, bytes, oldptr;
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int period_elapsed = 0;
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stride = runtime->frame_bits >> 3;
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for (i = 0; i < urb->number_of_packets; i++) {
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cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset;
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if (urb->iso_frame_desc[i].status) {
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snd_printd(KERN_ERR "frame %d active: %d\n", i, urb->iso_frame_desc[i].status);
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// continue;
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}
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bytes = urb->iso_frame_desc[i].actual_length;
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frames = bytes / stride;
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if (!subs->txfr_quirk)
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bytes = frames * stride;
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if (bytes % (runtime->sample_bits >> 3) != 0) {
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#ifdef CONFIG_SND_DEBUG_VERBOSE
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int oldbytes = bytes;
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#endif
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bytes = frames * stride;
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snd_printdd(KERN_ERR "Corrected urb data len. %d->%d\n",
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oldbytes, bytes);
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}
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/* update the current pointer */
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spin_lock_irqsave(&subs->lock, flags);
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oldptr = subs->hwptr_done;
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subs->hwptr_done += bytes;
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if (subs->hwptr_done >= runtime->buffer_size * stride)
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subs->hwptr_done -= runtime->buffer_size * stride;
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frames = (bytes + (oldptr % stride)) / stride;
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subs->transfer_done += frames;
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if (subs->transfer_done >= runtime->period_size) {
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subs->transfer_done -= runtime->period_size;
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period_elapsed = 1;
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}
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spin_unlock_irqrestore(&subs->lock, flags);
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/* 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;
|
|
}
|
|
|
|
static const char *usb_error_string(int err)
|
|
{
|
|
switch (err) {
|
|
case -ENODEV:
|
|
return "no device";
|
|
case -ENOENT:
|
|
return "endpoint not enabled";
|
|
case -EPIPE:
|
|
return "endpoint stalled";
|
|
case -ENOSPC:
|
|
return "not enough bandwidth";
|
|
case -ESHUTDOWN:
|
|
return "device disabled";
|
|
case -EHOSTUNREACH:
|
|
return "device suspended";
|
|
case -EINVAL:
|
|
case -EAGAIN:
|
|
case -EFBIG:
|
|
case -EMSGSIZE:
|
|
return "internal error";
|
|
default:
|
|
return "unknown error";
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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(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_playback_trigger(struct snd_pcm_substream *substream, int cmd)
|
|
{
|
|
struct snd_usb_substream *subs = substream->runtime->private_data;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
subs->ops.prepare = prepare_playback_urb;
|
|
return 0;
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
return deactivate_urbs(subs, 0, 0);
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
subs->ops.prepare = prepare_nodata_playback_urb;
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
int snd_usb_substream_capture_trigger(struct snd_pcm_substream *substream, int cmd)
|
|
{
|
|
struct snd_usb_substream *subs = substream->runtime->private_data;
|
|
|
|
switch (cmd) {
|
|
case SNDRV_PCM_TRIGGER_START:
|
|
subs->ops.retire = retire_capture_urb;
|
|
return start_urbs(subs, substream->runtime);
|
|
case SNDRV_PCM_TRIGGER_STOP:
|
|
return deactivate_urbs(subs, 0, 0);
|
|
case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
|
|
subs->ops.retire = retire_paused_capture_urb;
|
|
return 0;
|
|
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
|
|
subs->ops.retire = retire_capture_urb;
|
|
return 0;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
int snd_usb_substream_prepare(struct snd_usb_substream *subs,
|
|
struct snd_pcm_runtime *runtime)
|
|
{
|
|
/* clear urbs (to be sure) */
|
|
deactivate_urbs(subs, 0, 1);
|
|
wait_clear_urbs(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;
|
|
}
|
|
|