Eric Lee / smarc-fsl-linux-kernel

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sound/usb/usx2y/usb_stream.h 2.62 KB
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030a07e44   Karsten Wiese   ALSA: Add USB US1... 
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  /*
   * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de>
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License as published by the
   * Free Software Foundation; either version 2 of the License, or (at your
   * option) any later version.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software Foundation,
   * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */
  
  #define USB_STREAM_INTERFACE_VERSION 2
  
  #define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \
  	_IOW('H', 0x90, struct usb_stream_config)
  
  struct usb_stream_packet {
  	unsigned offset;
  	unsigned length;
  };
  
  
  struct usb_stream_config {
  	unsigned version;
  	unsigned sample_rate;
  	unsigned period_frames;
  	unsigned frame_size;
  };
  
  struct usb_stream {
  	struct usb_stream_config cfg;
  	unsigned read_size;
  	unsigned write_size;
  
  	int period_size;
  
  	unsigned state;
  
  	int idle_insize;
  	int idle_outsize;
  	int sync_packet;
  	unsigned insize_done;
  	unsigned periods_done;
  	unsigned periods_polled;
  
  	struct usb_stream_packet outpacket[2];
  	unsigned		 inpackets;
  	unsigned		 inpacket_head;
  	unsigned		 inpacket_split;
  	unsigned		 inpacket_split_at;
  	unsigned		 next_inpacket_split;
  	unsigned		 next_inpacket_split_at;
  	struct usb_stream_packet inpacket[0];
  };
  
  enum usb_stream_state {
  	usb_stream_invalid,
  	usb_stream_stopped,
  	usb_stream_sync0,
  	usb_stream_sync1,
  	usb_stream_ready,
  	usb_stream_running,
  	usb_stream_xrun,
  };
  
  #if __KERNEL__
  
  #define USB_STREAM_NURBS 4
  #define USB_STREAM_URBDEPTH 4
  
  struct usb_stream_kernel {
  	struct usb_stream *s;
  
  	void *write_page;
  
  	unsigned n_o_ps;
  
  	struct urb *inurb[USB_STREAM_NURBS];
  	struct urb *idle_inurb;
  	struct urb *completed_inurb;
  	struct urb *outurb[USB_STREAM_NURBS];
  	struct urb *idle_outurb;
  	struct urb *completed_outurb;
  	struct urb *i_urb;
  
  	int iso_frame_balance;
  
  	wait_queue_head_t sleep;
  
  	unsigned out_phase;
  	unsigned out_phase_peeked;
  	unsigned freqn;
  };
  
  struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
  				  struct usb_device *dev,
  				  unsigned in_endpoint, unsigned out_endpoint,
  				  unsigned sample_rate, unsigned use_packsize,
  				  unsigned period_frames, unsigned frame_size);
  void usb_stream_free(struct usb_stream_kernel *);
  int usb_stream_start(struct usb_stream_kernel *);
  void usb_stream_stop(struct usb_stream_kernel *);
  
  
  #endif