path: root/drivers/media/video/pms.c

/*
 *	Media Vision Pro Movie Studio
 *			or
 *	"all you need is an I2C bus some RAM and a prayer"
 *
 *	This draws heavily on code
 *
 *	(c) Wolfgang Koehler,  wolf@first.gmd.de, Dec. 1994
 *	Kiefernring 15
 *	14478 Potsdam, Germany
 *
 *	Most of this code is directly derived from his userspace driver.
 *	His driver works so send any reports to alan@redhat.com unless the
 *	userspace driver also doesn't work for you...
 *
 *      Changes:
 *      08/07/2003        Daniele Bellucci <bellucda@tiscali.it>
 *                        - pms_capture: report back -EFAULT
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <asm/io.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include <linux/mutex.h>

#include <asm/uaccess.h>


#define MOTOROLA	1
#define PHILIPS2	2
#define PHILIPS1	3
#define MVVMEMORYWIDTH	0x40		/* 512 bytes */

struct pms_device
{
	struct video_device v;
	struct video_picture picture;
	int height;
	int width;
	struct mutex lock;
};

struct i2c_info
{
	u8 slave;
	u8 sub;
	u8 data;
	u8 hits;
};

static int i2c_count 		= 0;
static struct i2c_info i2cinfo[64];

static int decoder 		= PHILIPS2;
static int standard 		= 0;	/* 0 - auto 1 - ntsc 2 - pal 3 - secam */

/*
 *	I/O ports and Shared Memory
 */

static int io_port		=	0x250;
static int data_port		=	0x251;
static int mem_base		=	0xC8000;
static void __iomem *mem;
static int video_nr             =       -1;



static inline void mvv_write(u8 index, u8 value)
{
	outw(index|(value<<8), io_port);
}

static inline u8 mvv_read(u8 index)
{
	outb(index, io_port);
	return inb(data_port);
}

static int pms_i2c_stat(u8 slave)
{
	int counter;
	int i;

	outb(0x28, io_port);

	counter=0;
	while((inb(data_port)&0x01)==0)
		if(counter++==256)
			break;

	while((inb(data_port)&0x01)!=0)
		if(counter++==256)
			break;

	outb(slave, io_port);

	counter=0;
	while((inb(data_port)&0x01)==0)
		if(counter++==256)
			break;

	while((inb(data_port)&0x01)!=0)
		if(counter++==256)
			break;

	for(i=0;i<12;i++)
	{
		char st=inb(data_port);
		if((st&2)!=0)
			return -1;
		if((st&1)==0)
			break;
	}
	outb(0x29, io_port);
	return inb(data_port);
}

static int pms_i2c_write(u16 slave, u16 sub, u16 data)
{
	int skip=0;
	int count;
	int i;

	for(i=0;i<i2c_count;i++)
	{
		if((i2cinfo[i].slave==slave) &&
		   (i2cinfo[i].sub == sub))
		{
			if(i2cinfo[i].data==data)
				skip=1;
			i2cinfo[i].data=data;
			i=i2c_count+1;
		}
	}

	if(i==i2c_count && i2c_count<64)
	{
		i2cinfo[i2c_count].slave=slave;
		i2cinfo[i2c_count].sub=sub;
		i2cinfo[i2c_count].data=data;
		i2c_count++;
	}

	if(skip)
		return 0;

	mvv_write(0x29, sub);
	mvv_write(0x2A, data);
	mvv_write(0x28, slave);

	outb(0x28, io_port);

	count=0;
	while((inb(data_port)&1)==0)
		if(count>255)
			break;
	while((inb(data_port)&1)!=0)
		if(count>255)
			break;

	count=inb(data_port);