xref: /kernel/linux/linux-6.6/drivers/media/usb/pvrusb2/pvrusb2-io.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 *
 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
 */
#ifndef __PVRUSB2_IO_H
#define __PVRUSB2_IO_H

#include <linux/usb.h>
#include <linux/list.h>

typedef void (*pvr2_stream_callback)(void *);

enum pvr2_buffer_state {
	pvr2_buffer_state_none = 0,   // Not on any list
	pvr2_buffer_state_idle = 1,   // Buffer is ready to be used again
	pvr2_buffer_state_queued = 2, // Buffer has been queued for filling
	pvr2_buffer_state_ready = 3,  // Buffer has data available
};

struct pvr2_stream;
struct pvr2_buffer;

struct pvr2_stream_stats {
	unsigned int buffers_in_queue;
	unsigned int buffers_in_idle;
	unsigned int buffers_in_ready;
	unsigned int buffers_processed;
	unsigned int buffers_failed;
	unsigned int bytes_processed;
};

/* Initialize / tear down stream structure */
struct pvr2_stream *pvr2_stream_create(void);
void pvr2_stream_destroy(struct pvr2_stream *);
void pvr2_stream_setup(struct pvr2_stream *,
		       struct usb_device *dev,int endpoint,
		       unsigned int tolerance);
void pvr2_stream_set_callback(struct pvr2_stream *,
			      pvr2_stream_callback func,
			      void *data);
void pvr2_stream_get_stats(struct pvr2_stream *,
			   struct pvr2_stream_stats *,
			   int zero_counts);

/* Query / set the nominal buffer count */
int pvr2_stream_get_buffer_count(struct pvr2_stream *);
int pvr2_stream_set_buffer_count(struct pvr2_stream *,unsigned int);

/* Get a pointer to a buffer that is either idle, ready, or is specified
   named. */
struct pvr2_buffer *pvr2_stream_get_idle_buffer(struct pvr2_stream *);
struct pvr2_buffer *pvr2_stream_get_ready_buffer(struct pvr2_stream *);
struct pvr2_buffer *pvr2_stream_get_buffer(struct pvr2_stream *sp,int id);

/* Find out how many buffers are idle or ready */
int pvr2_stream_get_ready_count(struct pvr2_stream *);


/* Kill all pending buffers and throw away any ready buffers as well */
void pvr2_stream_kill(struct pvr2_stream *);

/* Set up the actual storage for a buffer */
int pvr2_buffer_set_buffer(struct pvr2_buffer *,void *ptr,unsigned int cnt);

/* Find out size of data in the given ready buffer */
unsigned int pvr2_buffer_get_count(struct pvr2_buffer *);

/* Retrieve completion code for given ready buffer */
int pvr2_buffer_get_status(struct pvr2_buffer *);

/* Retrieve ID of given buffer */
int pvr2_buffer_get_id(struct pvr2_buffer *);

/* Start reading into given buffer (kill it if needed) */
int pvr2_buffer_queue(struct pvr2_buffer *);

#endif /* __PVRUSB2_IO_H */