sound/usb/usx2y/usb_stream.h

   1 /*
   2  * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License as published by the
   6  * Free Software Foundation; either version 2 of the License, or (at your
   7  * option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  */
  18
  19 #define USB_STREAM_INTERFACE_VERSION 2
  20
  21 #define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \
  22         _IOW('H', 0x90, struct usb_stream_config)
  23
  24 struct usb_stream_packet {
  25         unsigned offset;
  26         unsigned length;
  27 };
  28
  29
  30 struct usb_stream_config {
  31         unsigned version;
  32         unsigned sample_rate;
  33         unsigned period_frames;
  34         unsigned frame_size;
  35 };
  36
  37 struct usb_stream {
  38         struct usb_stream_config cfg;
  39         unsigned read_size;
  40         unsigned write_size;
  41
  42         int period_size;
  43
  44         unsigned state;
  45
  46         int idle_insize;
  47         int idle_outsize;
  48         int sync_packet;
  49         unsigned insize_done;
  50         unsigned periods_done;
  51         unsigned periods_polled;
  52
  53         struct usb_stream_packet outpacket[2];
  54         unsigned                 inpackets;
  55         unsigned                 inpacket_head;
  56         unsigned                 inpacket_split;
  57         unsigned                 inpacket_split_at;
  58         unsigned                 next_inpacket_split;
  59         unsigned                 next_inpacket_split_at;
  60         struct usb_stream_packet inpacket[0];
  61 };
  62
  63 enum usb_stream_state {
  64         usb_stream_invalid,
  65         usb_stream_stopped,
  66         usb_stream_sync0,
  67         usb_stream_sync1,
  68         usb_stream_ready,
  69         usb_stream_running,
  70         usb_stream_xrun,
  71 };
  72
  73 #if __KERNEL__
  74
  75 #define USB_STREAM_NURBS 4
  76 #define USB_STREAM_URBDEPTH 4
  77
  78 struct usb_stream_kernel {
  79         struct usb_stream *s;
  80
  81         void *write_page;
  82
  83         unsigned n_o_ps;
  84
  85         struct urb *inurb[USB_STREAM_NURBS];
  86         struct urb *idle_inurb;
  87         struct urb *completed_inurb;
  88         struct urb *outurb[USB_STREAM_NURBS];
  89         struct urb *idle_outurb;
  90         struct urb *completed_outurb;
  91         struct urb *i_urb;
  92
  93         int iso_frame_balance;
  94
  95         wait_queue_head_t sleep;
  96
  97         unsigned out_phase;
  98         unsigned out_phase_peeked;
  99         unsigned freqn;
 100 };
 101
 102 struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
 103                                   struct usb_device *dev,
 104                                   unsigned in_endpoint, unsigned out_endpoint,
 105                                   unsigned sample_rate, unsigned use_packsize,
 106                                   unsigned period_frames, unsigned frame_size);
 107 void usb_stream_free(struct usb_stream_kernel *);
 108 int usb_stream_start(struct usb_stream_kernel *);
 109 void usb_stream_stop(struct usb_stream_kernel *);
 110
 111
 112 #endif