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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/sound/usb/usx2y/usb_stream.h
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/*

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 * Copyright (C) 2007, 2008 Karsten Wiese <[email protected]>

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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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#define USB_STREAM_INTERFACE_VERSION 2

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#define SNDRV_USB_STREAM_IOCTL_SET_PARAMS \

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	_IOW('H', 0x90, struct usb_stream_config)

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struct usb_stream_packet {

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	unsigned offset;

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	unsigned length;

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};

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struct usb_stream_config {

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	unsigned version;

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	unsigned sample_rate;

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	unsigned period_frames;

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	unsigned frame_size;

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};

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struct usb_stream {

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	struct usb_stream_config cfg;

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	unsigned read_size;

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	unsigned write_size;

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	int period_size;

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	unsigned state;

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	int idle_insize;

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	int idle_outsize;

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	int sync_packet;

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	unsigned insize_done;

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	unsigned periods_done;

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	unsigned periods_polled;

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	struct usb_stream_packet outpacket[2];

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	unsigned		 inpackets;

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	unsigned		 inpacket_head;

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	unsigned		 inpacket_split;

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	unsigned		 inpacket_split_at;

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	unsigned		 next_inpacket_split;

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	unsigned		 next_inpacket_split_at;

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	struct usb_stream_packet inpacket[0];

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};

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enum usb_stream_state {

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	usb_stream_invalid,

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	usb_stream_stopped,

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	usb_stream_sync0,

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	usb_stream_sync1,

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	usb_stream_ready,

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	usb_stream_running,

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	usb_stream_xrun,

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};

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#if __KERNEL__

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#define USB_STREAM_NURBS 4

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#define USB_STREAM_URBDEPTH 4

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struct usb_stream_kernel {

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	struct usb_stream *s;

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	void *write_page;

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	unsigned n_o_ps;

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	struct urb *inurb[USB_STREAM_NURBS];

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	struct urb *idle_inurb;

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	struct urb *completed_inurb;

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	struct urb *outurb[USB_STREAM_NURBS];

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	struct urb *idle_outurb;

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	struct urb *completed_outurb;

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	struct urb *i_urb;

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	int iso_frame_balance;

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	wait_queue_head_t sleep;

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	unsigned out_phase;

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	unsigned out_phase_peeked;

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	unsigned freqn;

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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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void usb_stream_free(struct usb_stream_kernel *);

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int usb_stream_start(struct usb_stream_kernel *);

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void usb_stream_stop(struct usb_stream_kernel *);

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#endif

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