LXR linux/sound/usb/usx2y/usb

   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
  24struct usb_stream_packet {
  25        unsigned offset;
  26        unsigned length;
  27};
  28
  29
  30struct usb_stream_config {
  31        unsigned version;
  32        unsigned sample_rate;
  33        unsigned period_frames;
  34        unsigned frame_size;
  35};
  36
  37struct 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
  63enum 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
  78struct 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
 102struct 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);
 107void usb_stream_free(struct usb_stream_kernel *);
 108int usb_stream_start(struct usb_stream_kernel *);
 109void usb_stream_stop(struct usb_stream_kernel *);
 110
 111
 112#endif
 113