/*

 * 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;

	unsigned 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