754 строки
19 KiB
C
754 строки
19 KiB
C
/*
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* Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* 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 Foundation,
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* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/usb.h>
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#include <linux/gfp.h>
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#include "usb_stream.h"
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/* setup */
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static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk)
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{
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struct usb_stream *s = sk->s;
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sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn;
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return (sk->out_phase_peeked >> 16) * s->cfg.frame_size;
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}
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static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb)
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{
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struct usb_stream *s = sk->s;
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int pack, lb = 0;
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for (pack = 0; pack < sk->n_o_ps; pack++) {
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int l = usb_stream_next_packet_size(sk);
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if (s->idle_outsize + lb + l > s->period_size)
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goto check;
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sk->out_phase = sk->out_phase_peeked;
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urb->iso_frame_desc[pack].offset = lb;
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urb->iso_frame_desc[pack].length = l;
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lb += l;
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}
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snd_printdd(KERN_DEBUG "%i\n", lb);
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check:
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urb->number_of_packets = pack;
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urb->transfer_buffer_length = lb;
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s->idle_outsize += lb - s->period_size;
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snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize,
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lb, s->period_size);
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}
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static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
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struct urb **urbs, char *transfer,
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struct usb_device *dev, int pipe)
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{
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int u, p;
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int maxpacket = use_packsize ?
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use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe));
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int transfer_length = maxpacket * sk->n_o_ps;
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for (u = 0; u < USB_STREAM_NURBS;
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++u, transfer += transfer_length) {
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struct urb *urb = urbs[u];
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struct usb_iso_packet_descriptor *desc;
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urb->transfer_buffer = transfer;
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urb->dev = dev;
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urb->pipe = pipe;
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urb->number_of_packets = sk->n_o_ps;
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urb->context = sk;
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urb->interval = 1;
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if (usb_pipeout(pipe))
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continue;
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urb->transfer_buffer_length = transfer_length;
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desc = urb->iso_frame_desc;
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desc->offset = 0;
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desc->length = maxpacket;
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for (p = 1; p < sk->n_o_ps; ++p) {
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desc[p].offset = desc[p - 1].offset + maxpacket;
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desc[p].length = maxpacket;
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}
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}
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}
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static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize,
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struct usb_device *dev, int in_pipe, int out_pipe)
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{
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struct usb_stream *s = sk->s;
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char *indata = (char *)s + sizeof(*s) +
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sizeof(struct usb_stream_packet) *
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s->inpackets;
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int u;
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for (u = 0; u < USB_STREAM_NURBS; ++u) {
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sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
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sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL);
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}
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init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe);
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init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev,
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out_pipe);
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}
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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 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 rate)
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{
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return ((rate << 10) + 62) / 125;
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}
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void usb_stream_free(struct usb_stream_kernel *sk)
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{
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struct usb_stream *s;
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unsigned u;
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for (u = 0; u < USB_STREAM_NURBS; ++u) {
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usb_free_urb(sk->inurb[u]);
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sk->inurb[u] = NULL;
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usb_free_urb(sk->outurb[u]);
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sk->outurb[u] = NULL;
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}
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s = sk->s;
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if (!s)
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return;
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free_pages((unsigned long)sk->write_page, get_order(s->write_size));
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sk->write_page = NULL;
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free_pages((unsigned long)s, get_order(s->read_size));
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sk->s = NULL;
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}
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struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
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struct usb_device *dev,
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unsigned in_endpoint, unsigned out_endpoint,
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unsigned sample_rate, unsigned use_packsize,
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unsigned period_frames, unsigned frame_size)
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{
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int packets, max_packsize;
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int in_pipe, out_pipe;
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int read_size = sizeof(struct usb_stream);
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int write_size;
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int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000;
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int pg;
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in_pipe = usb_rcvisocpipe(dev, in_endpoint);
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out_pipe = usb_sndisocpipe(dev, out_endpoint);
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max_packsize = use_packsize ?
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use_packsize : usb_maxpacket(dev, in_pipe, 0);
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/*
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t_period = period_frames / sample_rate
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iso_packs = t_period / t_iso_frame
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= (period_frames / sample_rate) * (1 / t_iso_frame)
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*/
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packets = period_frames * usb_frames / sample_rate + 1;
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if (dev->speed == USB_SPEED_HIGH)
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packets = (packets + 7) & ~7;
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read_size += packets * USB_STREAM_URBDEPTH *
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(max_packsize + sizeof(struct usb_stream_packet));
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max_packsize = usb_maxpacket(dev, out_pipe, 1);
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write_size = max_packsize * packets * USB_STREAM_URBDEPTH;
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if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) {
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snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n");
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goto out;
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}
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pg = get_order(read_size);
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sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
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if (!sk->s) {
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snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
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goto out;
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}
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sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION;
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sk->s->read_size = read_size;
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sk->s->cfg.sample_rate = sample_rate;
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sk->s->cfg.frame_size = frame_size;
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sk->n_o_ps = packets;
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sk->s->inpackets = packets * USB_STREAM_URBDEPTH;
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sk->s->cfg.period_frames = period_frames;
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sk->s->period_size = frame_size * period_frames;
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sk->s->write_size = write_size;
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pg = get_order(write_size);
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sk->write_page =
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(void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
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if (!sk->write_page) {
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snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
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usb_stream_free(sk);
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return NULL;
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}
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/* calculate the frequency in 16.16 format */
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if (dev->speed == USB_SPEED_FULL)
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sk->freqn = get_usb_full_speed_rate(sample_rate);
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else
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sk->freqn = get_usb_high_speed_rate(sample_rate);
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init_urbs(sk, use_packsize, dev, in_pipe, out_pipe);
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sk->s->state = usb_stream_stopped;
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out:
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return sk->s;
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}
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/* start */
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static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb)
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{
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bool r;
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if (unlikely(urb->status)) {
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if (urb->status != -ESHUTDOWN && urb->status != -ENOENT)
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snd_printk(KERN_WARNING "status=%i\n", urb->status);
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sk->iso_frame_balance = 0x7FFFFFFF;
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return false;
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}
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r = sk->iso_frame_balance == 0;
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if (!r)
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sk->i_urb = urb;
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return r;
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}
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static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb)
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{
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sk->iso_frame_balance += urb->number_of_packets;
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return balance_check(sk, urb);
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}
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static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb)
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{
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sk->iso_frame_balance -= urb->number_of_packets;
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return balance_check(sk, urb);
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}
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static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *))
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{
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int u;
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for (u = 0; u < USB_STREAM_NURBS; u++) {
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struct urb *urb = urbs[u];
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urb->complete = complete;
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}
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}
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static int usb_stream_prepare_playback(struct usb_stream_kernel *sk,
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struct urb *inurb)
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{
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struct usb_stream *s = sk->s;
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struct urb *io;
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struct usb_iso_packet_descriptor *id, *od;
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int p = 0, lb = 0, l = 0;
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io = sk->idle_outurb;
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od = io->iso_frame_desc;
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for (; s->sync_packet < 0; ++p, ++s->sync_packet) {
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struct urb *ii = sk->completed_inurb;
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id = ii->iso_frame_desc +
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ii->number_of_packets + s->sync_packet;
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l = id->actual_length;
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od[p].length = l;
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od[p].offset = lb;
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lb += l;
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}
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for (;
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s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps;
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++p, ++s->sync_packet) {
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l = inurb->iso_frame_desc[s->sync_packet].actual_length;
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if (s->idle_outsize + lb + l > s->period_size)
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goto check_ok;
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od[p].length = l;
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od[p].offset = lb;
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lb += l;
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}
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check_ok:
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s->sync_packet -= inurb->number_of_packets;
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if (unlikely(s->sync_packet < -2 || s->sync_packet > 0)) {
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snd_printk(KERN_WARNING "invalid sync_packet = %i;"
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" p=%i nop=%i %i %x %x %x > %x\n",
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s->sync_packet, p, inurb->number_of_packets,
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s->idle_outsize + lb + l,
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s->idle_outsize, lb, l,
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s->period_size);
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return -1;
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}
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if (unlikely(lb % s->cfg.frame_size)) {
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snd_printk(KERN_WARNING"invalid outsize = %i\n",
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lb);
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return -1;
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}
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s->idle_outsize += lb - s->period_size;
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io->number_of_packets = p;
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io->transfer_buffer_length = lb;
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if (s->idle_outsize <= 0)
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return 0;
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snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize);
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return -1;
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}
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static void prepare_inurb(int number_of_packets, struct urb *iu)
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{
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struct usb_iso_packet_descriptor *id;
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int p;
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iu->number_of_packets = number_of_packets;
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id = iu->iso_frame_desc;
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id->offset = 0;
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for (p = 0; p < iu->number_of_packets - 1; ++p)
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id[p + 1].offset = id[p].offset + id[p].length;
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iu->transfer_buffer_length =
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id[0].length * iu->number_of_packets;
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}
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static int submit_urbs(struct usb_stream_kernel *sk,
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struct urb *inurb, struct urb *outurb)
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{
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int err;
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prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb);
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err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC);
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if (err < 0) {
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snd_printk(KERN_ERR "%i\n", err);
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return err;
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}
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sk->idle_inurb = sk->completed_inurb;
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sk->completed_inurb = inurb;
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err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC);
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if (err < 0) {
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snd_printk(KERN_ERR "%i\n", err);
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return err;
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}
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sk->idle_outurb = sk->completed_outurb;
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sk->completed_outurb = outurb;
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return 0;
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}
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#ifdef DEBUG_LOOP_BACK
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/*
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This loop_back() shows how to read/write the period data.
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*/
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static void loop_back(struct usb_stream *s)
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{
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char *i, *o;
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int il, ol, l, p;
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struct urb *iu;
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struct usb_iso_packet_descriptor *id;
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o = s->playback1st_to;
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ol = s->playback1st_size;
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l = 0;
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if (s->insplit_pack >= 0) {
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iu = sk->idle_inurb;
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id = iu->iso_frame_desc;
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p = s->insplit_pack;
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} else
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goto second;
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loop:
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for (; p < iu->number_of_packets && l < s->period_size; ++p) {
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i = iu->transfer_buffer + id[p].offset;
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il = id[p].actual_length;
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if (l + il > s->period_size)
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il = s->period_size - l;
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if (il <= ol) {
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memcpy(o, i, il);
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o += il;
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ol -= il;
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} else {
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memcpy(o, i, ol);
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singen_6pack(o, ol);
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o = s->playback_to;
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memcpy(o, i + ol, il - ol);
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o += il - ol;
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ol = s->period_size - s->playback1st_size;
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}
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l += il;
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}
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if (iu == sk->completed_inurb) {
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if (l != s->period_size)
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printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__,
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l/(int)s->cfg.frame_size);
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return;
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}
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second:
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iu = sk->completed_inurb;
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id = iu->iso_frame_desc;
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p = 0;
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goto loop;
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}
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#else
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static void loop_back(struct usb_stream *s)
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{
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}
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#endif
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static void stream_idle(struct usb_stream_kernel *sk,
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struct urb *inurb, struct urb *outurb)
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{
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struct usb_stream *s = sk->s;
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int l, p;
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int insize = s->idle_insize;
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int urb_size = 0;
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s->inpacket_split = s->next_inpacket_split;
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s->inpacket_split_at = s->next_inpacket_split_at;
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s->next_inpacket_split = -1;
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s->next_inpacket_split_at = 0;
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for (p = 0; p < inurb->number_of_packets; ++p) {
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struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc;
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l = id[p].actual_length;
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if (unlikely(l == 0 || id[p].status)) {
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snd_printk(KERN_WARNING "underrun, status=%u\n",
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id[p].status);
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goto err_out;
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}
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s->inpacket_head++;
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s->inpacket_head %= s->inpackets;
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if (s->inpacket_split == -1)
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s->inpacket_split = s->inpacket_head;
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s->inpacket[s->inpacket_head].offset =
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id[p].offset + (inurb->transfer_buffer - (void *)s);
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s->inpacket[s->inpacket_head].length = l;
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if (insize + l > s->period_size &&
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s->next_inpacket_split == -1) {
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s->next_inpacket_split = s->inpacket_head;
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s->next_inpacket_split_at = s->period_size - insize;
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}
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insize += l;
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urb_size += l;
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}
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s->idle_insize += urb_size - s->period_size;
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if (s->idle_insize < 0) {
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snd_printk(KERN_WARNING "%i\n",
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(s->idle_insize)/(int)s->cfg.frame_size);
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goto err_out;
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}
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s->insize_done += urb_size;
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l = s->idle_outsize;
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s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer -
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sk->write_page) - l;
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if (usb_stream_prepare_playback(sk, inurb) < 0)
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goto err_out;
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s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l;
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s->outpacket[1].offset = sk->completed_outurb->transfer_buffer -
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sk->write_page;
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if (submit_urbs(sk, inurb, outurb) < 0)
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goto err_out;
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loop_back(s);
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s->periods_done++;
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wake_up_all(&sk->sleep);
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return;
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err_out:
|
|
s->state = usb_stream_xrun;
|
|
wake_up_all(&sk->sleep);
|
|
}
|
|
|
|
static void i_capture_idle(struct urb *urb)
|
|
{
|
|
struct usb_stream_kernel *sk = urb->context;
|
|
if (balance_capture(sk, urb))
|
|
stream_idle(sk, urb, sk->i_urb);
|
|
}
|
|
|
|
static void i_playback_idle(struct urb *urb)
|
|
{
|
|
struct usb_stream_kernel *sk = urb->context;
|
|
if (balance_playback(sk, urb))
|
|
stream_idle(sk, sk->i_urb, urb);
|
|
}
|
|
|
|
static void stream_start(struct usb_stream_kernel *sk,
|
|
struct urb *inurb, struct urb *outurb)
|
|
{
|
|
struct usb_stream *s = sk->s;
|
|
if (s->state >= usb_stream_sync1) {
|
|
int l, p, max_diff, max_diff_0;
|
|
int urb_size = 0;
|
|
unsigned frames_per_packet, min_frames = 0;
|
|
frames_per_packet = (s->period_size - s->idle_insize);
|
|
frames_per_packet <<= 8;
|
|
frames_per_packet /=
|
|
s->cfg.frame_size * inurb->number_of_packets;
|
|
frames_per_packet++;
|
|
|
|
max_diff_0 = s->cfg.frame_size;
|
|
if (s->cfg.period_frames >= 256)
|
|
max_diff_0 <<= 1;
|
|
if (s->cfg.period_frames >= 1024)
|
|
max_diff_0 <<= 1;
|
|
max_diff = max_diff_0;
|
|
for (p = 0; p < inurb->number_of_packets; ++p) {
|
|
int diff;
|
|
l = inurb->iso_frame_desc[p].actual_length;
|
|
urb_size += l;
|
|
|
|
min_frames += frames_per_packet;
|
|
diff = urb_size -
|
|
(min_frames >> 8) * s->cfg.frame_size;
|
|
if (diff < max_diff) {
|
|
snd_printdd(KERN_DEBUG "%i %i %i %i\n",
|
|
s->insize_done,
|
|
urb_size / (int)s->cfg.frame_size,
|
|
inurb->number_of_packets, diff);
|
|
max_diff = diff;
|
|
}
|
|
}
|
|
s->idle_insize -= max_diff - max_diff_0;
|
|
s->idle_insize += urb_size - s->period_size;
|
|
if (s->idle_insize < 0) {
|
|
snd_printk(KERN_WARNING "%i %i %i\n",
|
|
s->idle_insize, urb_size, s->period_size);
|
|
return;
|
|
} else if (s->idle_insize == 0) {
|
|
s->next_inpacket_split =
|
|
(s->inpacket_head + 1) % s->inpackets;
|
|
s->next_inpacket_split_at = 0;
|
|
} else {
|
|
unsigned split = s->inpacket_head;
|
|
l = s->idle_insize;
|
|
while (l > s->inpacket[split].length) {
|
|
l -= s->inpacket[split].length;
|
|
if (split == 0)
|
|
split = s->inpackets - 1;
|
|
else
|
|
split--;
|
|
}
|
|
s->next_inpacket_split = split;
|
|
s->next_inpacket_split_at =
|
|
s->inpacket[split].length - l;
|
|
}
|
|
|
|
s->insize_done += urb_size;
|
|
|
|
if (usb_stream_prepare_playback(sk, inurb) < 0)
|
|
return;
|
|
|
|
} else
|
|
playback_prep_freqn(sk, sk->idle_outurb);
|
|
|
|
if (submit_urbs(sk, inurb, outurb) < 0)
|
|
return;
|
|
|
|
if (s->state == usb_stream_sync1 && s->insize_done > 360000) {
|
|
/* just guesswork ^^^^^^ */
|
|
s->state = usb_stream_ready;
|
|
subs_set_complete(sk->inurb, i_capture_idle);
|
|
subs_set_complete(sk->outurb, i_playback_idle);
|
|
}
|
|
}
|
|
|
|
static void i_capture_start(struct urb *urb)
|
|
{
|
|
struct usb_iso_packet_descriptor *id = urb->iso_frame_desc;
|
|
struct usb_stream_kernel *sk = urb->context;
|
|
struct usb_stream *s = sk->s;
|
|
int p;
|
|
int empty = 0;
|
|
|
|
if (urb->status) {
|
|
snd_printk(KERN_WARNING "status=%i\n", urb->status);
|
|
return;
|
|
}
|
|
|
|
for (p = 0; p < urb->number_of_packets; ++p) {
|
|
int l = id[p].actual_length;
|
|
if (l < s->cfg.frame_size) {
|
|
++empty;
|
|
if (s->state >= usb_stream_sync0) {
|
|
snd_printk(KERN_WARNING "%i\n", l);
|
|
return;
|
|
}
|
|
}
|
|
s->inpacket_head++;
|
|
s->inpacket_head %= s->inpackets;
|
|
s->inpacket[s->inpacket_head].offset =
|
|
id[p].offset + (urb->transfer_buffer - (void *)s);
|
|
s->inpacket[s->inpacket_head].length = l;
|
|
}
|
|
#ifdef SHOW_EMPTY
|
|
if (empty) {
|
|
printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__,
|
|
urb->iso_frame_desc[0].actual_length);
|
|
for (pack = 1; pack < urb->number_of_packets; ++pack) {
|
|
int l = urb->iso_frame_desc[pack].actual_length;
|
|
printk(" %i", l);
|
|
}
|
|
printk("\n");
|
|
}
|
|
#endif
|
|
if (!empty && s->state < usb_stream_sync1)
|
|
++s->state;
|
|
|
|
if (balance_capture(sk, urb))
|
|
stream_start(sk, urb, sk->i_urb);
|
|
}
|
|
|
|
static void i_playback_start(struct urb *urb)
|
|
{
|
|
struct usb_stream_kernel *sk = urb->context;
|
|
if (balance_playback(sk, urb))
|
|
stream_start(sk, sk->i_urb, urb);
|
|
}
|
|
|
|
int usb_stream_start(struct usb_stream_kernel *sk)
|
|
{
|
|
struct usb_stream *s = sk->s;
|
|
int frame = 0, iters = 0;
|
|
int u, err;
|
|
int try = 0;
|
|
|
|
if (s->state != usb_stream_stopped)
|
|
return -EAGAIN;
|
|
|
|
subs_set_complete(sk->inurb, i_capture_start);
|
|
subs_set_complete(sk->outurb, i_playback_start);
|
|
memset(sk->write_page, 0, s->write_size);
|
|
dotry:
|
|
s->insize_done = 0;
|
|
s->idle_insize = 0;
|
|
s->idle_outsize = 0;
|
|
s->sync_packet = -1;
|
|
s->inpacket_head = -1;
|
|
sk->iso_frame_balance = 0;
|
|
++try;
|
|
for (u = 0; u < 2; u++) {
|
|
struct urb *inurb = sk->inurb[u];
|
|
struct urb *outurb = sk->outurb[u];
|
|
playback_prep_freqn(sk, outurb);
|
|
inurb->number_of_packets = outurb->number_of_packets;
|
|
inurb->transfer_buffer_length =
|
|
inurb->number_of_packets *
|
|
inurb->iso_frame_desc[0].length;
|
|
|
|
if (u == 0) {
|
|
int now;
|
|
struct usb_device *dev = inurb->dev;
|
|
frame = usb_get_current_frame_number(dev);
|
|
do {
|
|
now = usb_get_current_frame_number(dev);
|
|
++iters;
|
|
} while (now > -1 && now == frame);
|
|
}
|
|
err = usb_submit_urb(inurb, GFP_ATOMIC);
|
|
if (err < 0) {
|
|
snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])"
|
|
" returned %i\n", u, err);
|
|
return err;
|
|
}
|
|
err = usb_submit_urb(outurb, GFP_ATOMIC);
|
|
if (err < 0) {
|
|
snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])"
|
|
" returned %i\n", u, err);
|
|
return err;
|
|
}
|
|
|
|
if (inurb->start_frame != outurb->start_frame) {
|
|
snd_printd(KERN_DEBUG
|
|
"u[%i] start_frames differ in:%u out:%u\n",
|
|
u, inurb->start_frame, outurb->start_frame);
|
|
goto check_retry;
|
|
}
|
|
}
|
|
snd_printdd(KERN_DEBUG "%i %i\n", frame, iters);
|
|
try = 0;
|
|
check_retry:
|
|
if (try) {
|
|
usb_stream_stop(sk);
|
|
if (try < 5) {
|
|
msleep(1500);
|
|
snd_printd(KERN_DEBUG "goto dotry;\n");
|
|
goto dotry;
|
|
}
|
|
snd_printk(KERN_WARNING"couldn't start"
|
|
" all urbs on the same start_frame.\n");
|
|
return -EFAULT;
|
|
}
|
|
|
|
sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2];
|
|
sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2];
|
|
sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1];
|
|
sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1];
|
|
|
|
/* wait, check */
|
|
{
|
|
int wait_ms = 3000;
|
|
while (s->state != usb_stream_ready && wait_ms > 0) {
|
|
snd_printdd(KERN_DEBUG "%i\n", s->state);
|
|
msleep(200);
|
|
wait_ms -= 200;
|
|
}
|
|
}
|
|
|
|
return s->state == usb_stream_ready ? 0 : -EFAULT;
|
|
}
|
|
|
|
|
|
/* stop */
|
|
|
|
void usb_stream_stop(struct usb_stream_kernel *sk)
|
|
{
|
|
int u;
|
|
if (!sk->s)
|
|
return;
|
|
for (u = 0; u < USB_STREAM_NURBS; ++u) {
|
|
usb_kill_urb(sk->inurb[u]);
|
|
usb_kill_urb(sk->outurb[u]);
|
|
}
|
|
sk->s->state = usb_stream_stopped;
|
|
msleep(400);
|
|
}
|