saa7146_core.c

linux数字电视播放器,比先的版本高一些.

/*
    saa7146_core.c - core-functions + i2c driver for the saa7146 by
    Philips Semiconductors.
    
    Copyright (C) 1998,1999 Michael Hunold <[e-mail]>

    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.
 */


#include <linux/module.h>	/* for module-version */
#include <linux/delay.h>	/* for delay-stuff */
#include <linux/slab.h>		/* for kmalloc/kfree */
#include <linux/pci.h>		/* for pci-config-stuff, vendor ids etc. */
#include <linux/wrapper.h>	/* for mem_map_reserve */
#include <linux/init.h>
#include <asm/io.h>		/* for accessing the pci-device */
#include <linux/vmalloc.h>
#include <linux/mm.h>

#include "saa7146_defs.h"
#include "saa7146_core.h"
#include "saa7146_v4l.h"
#include "av7110.h"
#include "compat.h"
#include "dvb_i2c.h"

/* insmod parameter: here you can specify the number of video-buffers
   to be allocated. for simple capturing 2 buffers (double-buffering)
   should suffice. but if you plan to do 25fps grabbing, you should
   set this to 4(=maximum), in order to be able to catch up from
   temporarily delays */
static int buffers = 2;

/* insmod parameter: allows you to specify the pci latency timer.
   Value 0 (default) means 'do not change'. */
static int latency = 0;

/* insmod parameter: some programs (e.g. 磛ic