/* *	Cleaned up to use existing videodev interface and allow the idea *	of multiple teletext decoders on the video4linux iface. Changed i2c *	to cover addressing clashes on device busses. It's also rebuilt so *	you can add arbitary multiple teletext devices to Linux video4linux *	now (well 32 anyway). * *	Alan Cox <Alan.Cox@linux.org> * *	The original driver was heavily modified to match the i2c interface *	It was truncated to use the WinTV boards, too. * *	Copyright (c) 1998 Richard Guenther <richard.guenther@student.uni-tuebingen.de> * * $Id: saa5249.c,v 1.1 1998/03/30 22:23:23 alan Exp $ * *	Derived From * * vtx.c: * This is a loadable character-device-driver for videotext-interfaces * (aka teletext). Please check the Makefile/README for a list of supported * interfaces. * * Copyright (c) 1994-97 Martin Buck  <martin-2.buck@student.uni-ulm.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, * USA. */#include <linux/module.h>#include <linux/kernel.h>#include <linux/sched.h>#include <linux/mm.h>#include <linux/errno.h>#include <linux/delay.h>#include <linux/ioport.h>#include <linux/slab.h>#include <linux/init.h>#include <stdarg.h>#include <linux/i2c.h>#include <linux/videotext.h>#include <linux/videodev.h>#include <asm/io.h>#include <asm/uaccess.h>#define VTX_VER_MAJ 1#define VTX_VER_MIN 7#define NUM_DAUS 4#define NUM_BUFS 8#define IF_NAME "SAA5249"static const int disp_modes[8][3] = {	{ 0x46, 0x03, 0x03 },	/* DISPOFF */	{ 0x46, 0xcc, 0xcc },	/* DISPNORM */	{ 0x44, 0x0f, 0x0f },	/* DISPTRANS */	{ 0x46, 0xcc, 0x46 },	/* DISPINS */	{ 0x44, 0x03, 0x03 },	/* DISPOFF, interlaced */	{ 0x44, 0xcc, 0xcc },	/* DISPNORM, interlaced */	{ 0x44, 0x0f, 0x0f },	/* DISPTRANS, interlaced */	{ 0x44, 0xcc, 0x46 }	/* DISPINS, interlaced */};#define PAGE_WAIT (300*HZ/1000)			/* Time between requesting page and */						/* checking status bits */#define PGBUF_EXPIRE (15*HZ)			/* Time to wait before retransmitting */						/* page regardless of infobits */typedef struct {	u8 pgbuf[VTX_VIRTUALSIZE];		/* Page-buffer */	u8 laststat[10];			/* Last value of infobits for DAU */	u8 sregs[7];				/* Page-request registers */	unsigned long expire;			/* Time when page will be expired */	unsigned clrfound : 1;			/* VTXIOCCLRFOUND has been called */	unsigned stopped : 1;			/* VTXIOCSTOPDAU has been called */} vdau_t;struct saa5249_device{	vdau_t vdau[NUM_DAUS];			/* Data for virtual DAUs (the 5249 only has one */						/* real DAU, so we have to simulate some more) */	int vtx_use_count;	int is_searching[NUM_DAUS];	int disp_mode;	int virtual_mode;	struct i2c_client *client;	struct semaphore lock;};#define CCTWR 34		/* I睠 write/read-address of vtx-chip */#define CCTRD 35#define NOACK_REPEAT 10		/* Retry access this many times on failure */#define CLEAR_DELAY (HZ/20)	/* Time required to clear a page */#define READY_TIMEOUT (30*HZ/1000)	/* Time to wait for ready signal of I睠-bus interface */#define INIT_DELAY 500		/* Time in usec to wait at initialization of CEA interface */#define START_DELAY 10		/* Time in usec to wait before starting write-cycle (CEA) */#define VTX_DEV_MINOR 0/* General defines and debugging support */#ifndef FALSE#define FALSE 0#define TRUE 1#endif#ifndef MIN#define MIN(a, b) ((a) < (b) ? (a) : (b))#define MAX(a, b) ((a) > (b) ? (a) : (b))#endif#define RESCHED \        do { \          if (current->need_resched) \            schedule(); \        } while (0)static struct video_device saa_template;	/* Declared near bottom *//* Addresses to scan */static unsigned short normal_i2c[] = {34>>1,I2C_CLIENT_END};static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};static unsigned short probe[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };static unsigned short probe_range[2]  = { I2C_CLIENT_END, I2C_CLIENT_END };static unsigned short ignore[2]       = { I2C_CLIENT_END, I2C_CLIENT_END };static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };static unsigned short force[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };static struct i2c_client_address_data addr_data = {	normal_i2c, normal_i2c_range, 	probe, probe_range, 	ignore, ignore_range, 	force};static struct i2c_client client_template;static int saa5249_attach(struct i2c_adapter *adap, int addr, unsigned short flags, int kind)		{	int pgbuf;	int err;	struct i2c_client *client;	struct video_device *vd;	struct saa5249_device *t;	printk(KERN_INFO "saa5249: teletext chip found.\n");	client=kmalloc(sizeof(*client), GFP_KERNEL);	if(client==NULL)		return -ENOMEM;        client_template.adapter = adap;        client_template.addr = addr;	memcpy(client, &client_template, sizeof(*client));	t = kmalloc(sizeof(*t), GFP_KERNEL);	if(t==NULL)	{		kfree(client);		return -ENOMEM;	}	memset(t, 0, sizeof(*t));	strcpy(client->name, IF_NAME);	init_MUTEX(&t->lock);		/*	 *	Now create a video4linux device	 */	 	client->data = vd=(struct video_device *)kmalloc(sizeof(struct video_device), GFP_KERNEL);	if(vd==NULL)	{		kfree(t);		kfree(client);		return -ENOMEM;	}	memcpy(vd, &saa_template, sizeof(*vd));			for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) 	{		memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));		memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));		memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));		t->vdau[pgbuf].expire = 0;		t->vdau[pgbuf].clrfound = TRUE;		t->vdau[pgbuf].stopped = TRUE;		t->is_searching[pgbuf] = FALSE;	}	vd->priv=t;		 		/*	 *	Register it	 */	if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)	{		kfree(t);		kfree(vd);		kfree(client);		return err;	}	t->client = client;	i2c_attach_client(client);	MOD_INC_USE_COUNT;	return 0;}/* *	We do most of the hard work when we become a device on the i2c. */ static int saa5249_probe(struct i2c_adapter *adap){	/* Only attach these chips to the BT848 bus for now */		if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848))	{		return i2c_probe(adap, &addr_data, saa5249_attach);	}	return 0;}static int saa5249_detach(struct i2c_client *client){	struct video_device *vd=client->data;	i2c_detach_client(client);	video_unregister_device(vd);	kfree(vd->priv);	kfree(vd);	kfree(client);	MOD_DEC_USE_COUNT;	return 0;}static int saa5249_command(struct i2c_client *device,			     unsigned int cmd, void *arg){	return -EINVAL;}/* new I2C driver support */static struct i2c_driver i2c_driver_videotext = {	IF_NAME,		/* name */	I2C_DRIVERID_SAA5249, /* in i2c.h */	I2C_DF_NOTIFY,	saa5249_probe,	saa5249_detach,	saa5249_command};static struct i2c_client client_template = {	"(unset)",	-1,	0,	0,	NULL,	&i2c_driver_videotext};/* *	Wait the given number of jiffies (10ms). This calls the scheduler, so the actual *	delay may be longer. */static void jdelay(unsigned long delay) {	sigset_t oldblocked = current->blocked;	spin_lock_irq(&current->sighand->siglock);	sigfillset(&current->blocked);	recalc_sigpending();	spin_unlock_irq(&current->sighand->siglock);	current->state = TASK_INTERRUPTIBLE;	schedule_timeout(delay);	spin_lock_irq(&current->sighand->siglock);	current->blocked = oldblocked;	recalc_sigpending();	spin_unlock_irq(&current->sighand->siglock);}/* *	I2C interfaces */ static int i2c_sendbuf(struct saa5249_device *t, int reg, int count, u8 *data) {	char buf[64];		buf[0] = reg;	memcpy(buf+1, data, count);		if(i2c_master_send(t->client, buf, count+1)==count+1)		return 0;	return -1;}static int i2c_senddata(struct saa5249_device *t, ...){	unsigned char buf[64];	int v;	int ct=0;	va_list argp;	va_start(argp,t);		while((v=va_arg(argp,int))!=-1)		buf[ct++]=v;	return i2c_sendbuf(t, buf[0], ct-1, buf+1);}/* Get count number of bytes from I睠-device at address adr, store them in buf. Start & stop * handshaking is done by this routine, ack will be sent after the last byte to inhibit further * sending of data. If uaccess is TRUE, data is written to user-space with put_user. * Returns -1 if I睠-device didn't send acknowledge, 0 otherwise */static int i2c_getdata(struct saa5249_device *t, int count, u8 *buf) {	if(i2c_master_recv(t->client, buf, count)!=count)		return -1;	return 0;}/* *	Standard character-device-driver functions */static int do_saa5249_ioctl(struct saa5249_device *t, unsigned int cmd, void *arg) {