drivers/char/saa5249.c

   1 /*
   2  *      Cleaned up to use existing videodev interface and allow the idea
   3  *      of multiple teletext decoders on the video4linux iface. Changed i2c
   4  *      to cover addressing clashes on device busses. It's also rebuilt so
   5  *      you can add arbitary multiple teletext devices to Linux video4linux
   6  *      now (well 32 anyway).
   7  *
   8  *      Alan Cox <Alan.Cox@linux.org>
   9  *
  10  *      The original driver was heavily modified to match the i2c interface
  11  *      It was truncated to use the WinTV boards, too.
  12  *
  13  *      Copyright (c) 1998 Richard Guenther <richard.guenther@student.uni-tuebingen.de>
  14  *
  15  * $Id: saa5249.c,v 1.1 1998/03/30 22:23:23 alan Exp $
  16  *
  17  *      Derived From
  18  *
  19  * vtx.c:
  20  * This is a loadable character-device-driver for videotext-interfaces
  21  * (aka teletext). Please check the Makefile/README for a list of supported
  22  * interfaces.
  23  *
  24  * Copyright (c) 1994-97 Martin Buck  <martin-2.buck@student.uni-ulm.de>
  25  *
  26  *
  27  * This program is free software; you can redistribute it and/or modify
  28  * it under the terms of the GNU General Public License as published by
  29  * the Free Software Foundation; either version 2 of the License, or
  30  * (at your option) any later version.
  31  *
  32  * This program is distributed in the hope that it will be useful,
  33  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  34  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  35  * GNU General Public License for more details.
  36  *
  37  * You should have received a copy of the GNU General Public License
  38  * along with this program; if not, write to the Free Software
  39  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  40  * USA.
  41  */
  42
  43 #include <linux/module.h>
  44
  45 #include <linux/kernel.h>
  46 #include <linux/sched.h>
  47 #include <linux/mm.h>
  48 #include <linux/errno.h>
  49 #include <linux/delay.h>
  50 #include <linux/ioport.h>
  51 #include <linux/malloc.h>
  52 #include <asm/io.h>
  53 #include <asm/uaccess.h>
  54 #include <stdarg.h>
  55 #include <linux/i2c.h>
  56 #include <linux/videotext.h>
  57 #include <linux/videodev.h>
  58
  59 #define VTX_VER_MAJ 1
  60 #define VTX_VER_MIN 7
  61
  62
  63
  64 #define NUM_DAUS 4
  65 #define NUM_BUFS 8
  66 #define IF_NAME "SAA5249"
  67
  68 static const int disp_modes[8][3] =
  69 {
  70         { 0x46, 0x03, 0x03 },   /* DISPOFF */
  71         { 0x46, 0xcc, 0xcc },   /* DISPNORM */
  72         { 0x44, 0x0f, 0x0f },   /* DISPTRANS */
  73         { 0x46, 0xcc, 0x46 },   /* DISPINS */
  74         { 0x44, 0x03, 0x03 },   /* DISPOFF, interlaced */
  75         { 0x44, 0xcc, 0xcc },   /* DISPNORM, interlaced */
  76         { 0x44, 0x0f, 0x0f },   /* DISPTRANS, interlaced */
  77         { 0x44, 0xcc, 0x46 }    /* DISPINS, interlaced */
  78 };
  79
  80
  81
  82 #define PAGE_WAIT 30                            /* Time in jiffies between requesting page and */
  83                                                 /* checking status bits */
  84 #define PGBUF_EXPIRE 1500                       /* Time in jiffies to wait before retransmitting */
  85                                                 /* page regardless of infobits */
  86 typedef struct {
  87         u8 pgbuf[VTX_VIRTUALSIZE];              /* Page-buffer */
  88         u8 laststat[10];                        /* Last value of infobits for DAU */
  89         u8 sregs[7];                            /* Page-request registers */
  90         unsigned long expire;                   /* Time when page will be expired */
  91         unsigned clrfound : 1;                  /* VTXIOCCLRFOUND has been called */
  92         unsigned stopped : 1;                   /* VTXIOCSTOPDAU has been called */
  93 } vdau_t;
  94
  95 struct saa5249_device
  96 {
  97         vdau_t vdau[NUM_DAUS];                  /* Data for virtual DAUs (the 5249 only has one */
  98                                                 /* real DAU, so we have to simulate some more) */
  99         int vtx_use_count;
 100         int is_searching[NUM_DAUS];
 101         int disp_mode;
 102         int virtual_mode;
 103         struct i2c_bus *bus;
 104 };
 105
 106
 107 #define CCTWR 34                /* I²C write/read-address of vtx-chip */
 108 #define CCTRD 35
 109 #define NOACK_REPEAT 10         /* Retry access this many times on failure */
 110 #define CLEAR_DELAY 5           /* Time in jiffies required to clear a page */
 111 #define I2C_TIMEOUT 300         /* open/close/SDA-check timeout in jiffies */
 112 #define READY_TIMEOUT 3         /* Time in jiffies to wait for ready signal of I²C-bus interface */
 113 #define INIT_DELAY 500          /* Time in usec to wait at initialization of CEA interface */
 114 #define START_DELAY 10          /* Time in usec to wait before starting write-cycle (CEA) */
 115
 116 #define VTX_DEV_MINOR 0
 117
 118 /* General defines and debugging support */
 119
 120 #ifndef FALSE
 121 #define FALSE 0
 122 #define TRUE 1
 123 #endif
 124 #ifndef MIN
 125 #define MIN(a, b) ((a) < (b) ? (a) : (b))
 126 #define MAX(a, b) ((a) > (b) ? (a) : (b))
 127 #endif
 128
 129 #define RESCHED \
 130         do { \
 131           if (current->need_resched) \
 132             schedule(); \
 133         } while (0)
 134
 135 static struct video_device saa_template;        /* Declared near bottom */
 136
 137 /*
 138  *      We do most of the hard work when we become a device on the i2c.
 139  */
 140
 141 static int saa5249_attach(struct i2c_device *device)
 142 {
 143         int pgbuf;
 144         int err;
 145         struct video_device *vd;
 146         struct saa5249_device *t;
 147         /* Only attach these chips to the BT848 bus for now */
 148
 149         if(device->bus->id!=I2C_BUSID_BT848)
 150                 return -EINVAL;
 151
 152         strcpy(device->name, IF_NAME);
 153
 154         /*
 155          *      Now create a video4linux device
 156          */
 157
 158         vd=(struct video_device *)kmalloc(sizeof(struct video_device), GFP_KERNEL);
 159         if(vd==NULL)
 160                 return -ENOMEM;
 161
 162         memcpy(vd, &saa_template, sizeof(*vd));
 163
 164         /*
 165          *      Attach an saa5249 device
 166          */
 167
 168         t=(struct saa5249_device *)kmalloc(sizeof(struct saa5249_device), GFP_KERNEL);
 169         if(t==NULL)
 170         {
 171                 kfree(vd);
 172                 return -ENOMEM;
 173         }
 174
 175         memset(t, 0, sizeof(*t));
 176
 177         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 178         {
 179                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 180                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 181                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 182                 t->vdau[pgbuf].expire = 0;
 183                 t->vdau[pgbuf].clrfound = TRUE;
 184                 t->vdau[pgbuf].stopped = TRUE;
 185                 t->is_searching[pgbuf] = FALSE;
 186         }
 187         vd->priv=t;
 188         device->data=vd;
 189
 190         /*
 191          *      Register it
 192          */
 193
 194         if((err=video_register_device(vd, VFL_TYPE_VTX))<0)
 195         {
 196                 kfree(t);
 197                 kfree(vd);
 198                 return err;
 199         }
 200         t->bus = device->bus;
 201         return 0;
 202 }
 203
 204 static int saa5249_detach(struct i2c_device *device)
 205 {
 206         struct video_device *vd=device->data;
 207         video_unregister_device(vd);
 208         kfree(vd->priv);
 209         kfree(vd);
 210         return 0;
 211 }
 212
 213 static int saa5249_command(struct i2c_device *device,
 214                              unsigned int cmd, void *arg)
 215 {
 216         return -EINVAL;
 217 }
 218
 219 /* new I2C driver support */
 220
 221 static struct i2c_driver i2c_driver_videotext =
 222 {
 223         IF_NAME,                /* name */
 224         I2C_DRIVERID_VIDEOTEXT, /* in i2c.h */
 225         34, 35,                 /* Addr range */
 226         saa5249_attach,
 227         saa5249_detach,
 228         saa5249_command
 229 };
 230
 231 /*
 232  *      Wait the given number of jiffies (10ms). This calls the scheduler, so the actual
 233  *      delay may be longer.
 234  */
 235
 236 static void jdelay(unsigned long delay)
 237 {
 238         sigset_t oldblocked = current->blocked;
 239
 240         spin_lock_irq(&current->sigmask_lock);
 241         sigfillset(&current->blocked);
 242         recalc_sigpending(current);
 243         spin_unlock_irq(&current->sigmask_lock);
 244         current->state = TASK_INTERRUPTIBLE;
 245         schedule_timeout(delay);
 246
 247         spin_lock_irq(&current->sigmask_lock);
 248         current->blocked = oldblocked;
 249         recalc_sigpending(current);
 250         spin_unlock_irq(&current->sigmask_lock);
 251 }
 252
 253
 254 /* Send arbitrary number of bytes to I²C-bus. Start & stop handshaking is done by this routine.
 255  * adr should be address of I²C-device, varargs-list of values to send must be terminated by -1
 256  * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise
 257  */
 258
 259 static int i2c_senddata(struct saa5249_device *t, int adr, ...)
 260 {
 261         int val, loop;
 262         va_list argp;
 263
 264         for (loop = 0; loop <= NOACK_REPEAT; loop++)
 265         {
 266                 i2c_start(t->bus);
 267                 if (i2c_sendbyte(t->bus, adr, 0) != 0)
 268                         goto loopend;
 269
 270                 va_start(argp, adr);
 271                 while ((val = va_arg(argp, int)) != -1)
 272                 {
 273                         if (val < 0 || val > 255)
 274                         {
 275                                 printk(KERN_ERR "vtx: internal error in i2c_senddata\n");
 276                                 break;
 277                         }
 278                         if (i2c_sendbyte(t->bus, val, 0) != 0)
 279                                 goto loopend;
 280                 }
 281                 va_end(argp);
 282                 i2c_stop(t->bus);
 283                 return 0;
 284 loopend:
 285                 i2c_stop(t->bus);
 286         }
 287         va_end(argp);
 288         return -1;
 289 }
 290
 291
 292 /* Send count number of bytes from buffer buf to I²C-device adr. Start & stop handshaking is
 293  * done by this routine. If uaccess is TRUE, data is read from user-space with get_user.
 294  * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise
 295  */
 296
 297 static int i2c_sendbuf(struct saa5249_device *t, int adr, int reg, int count, u8 *buf, int uaccess)
 298 {
 299         int pos, loop;
 300         u8 val;
 301
 302         for (loop = 0; loop <= NOACK_REPEAT; loop++)
 303         {
 304                 i2c_start(t->bus);
 305                 if (i2c_sendbyte(t->bus, adr, 0) != 0 || i2c_sendbyte(t->bus, reg, 0) != 0)
 306                         goto loopend;
 307                 for (pos = 0; pos < count; pos++)
 308                 {
 309                         /* FIXME: FAULT WITH CLI/SPINLOCK ?? */
 310                         if (uaccess)
 311                                 get_user(val, buf + pos);
 312                         else
 313                                 val = buf[pos];
 314                         if (i2c_sendbyte(t->bus, val, 0) != 0)
 315                                 goto loopend;
 316                         RESCHED;
 317                 }
 318                 i2c_stop(t->bus);
 319                 return 0;
 320 loopend:
 321                 i2c_stop(t->bus);
 322         }
 323         return -1;
 324 }
 325
 326
 327 /* Get count number of bytes from I²C-device at address adr, store them in buf. Start & stop
 328  * handshaking is done by this routine, ack will be sent after the last byte to inhibit further
 329  * sending of data. If uaccess is TRUE, data is written to user-space with put_user.
 330  * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise
 331  */
 332
 333 static int i2c_getdata(struct saa5249_device *t, int adr, int count, u8 *buf, int uaccess)
 334 {
 335         int pos, loop, val;
 336
 337         for (loop = 0; loop <= NOACK_REPEAT; loop++)
 338         {
 339                 i2c_start(t->bus);
 340                 if (i2c_sendbyte(t->bus, adr, 1) != 0)
 341                         goto loopend;
 342                 for (pos = 0; pos < count; pos++)
 343                 {
 344                         val = i2c_readbyte(t->bus, (pos==count-1) ? 1 : 0);
 345                         if (uaccess)
 346                                 put_user(val, buf + pos);
 347                         else
 348                                 buf[pos] = val;
 349                         RESCHED;
 350                 }
 351                 i2c_stop(t->bus);
 352                 return 0;
 353 loopend:
 354                 i2c_stop(t->bus);
 355         }
 356         return -1;
 357 }
 358
 359
 360 /*
 361  *      Standard character-device-driver functions
 362  */
 363
 364 static int saa5249_ioctl(struct video_device *vd, unsigned int cmd, void *arg)
 365 {
 366         struct saa5249_device *t=vd->priv;
 367         static int virtual_mode = FALSE;
 368
 369         switch(cmd)
 370         {
 371                 case VTXIOCGETINFO:
 372                 {
 373                         vtx_info_t info;
 374                         info.version_major = VTX_VER_MAJ;
 375                         info.version_minor = VTX_VER_MIN;
 376                         info.numpages = NUM_DAUS;
 377                         /*info.cct_type = CCT_TYPE;*/
 378                         if(copy_to_user((void*)arg, &info, sizeof(vtx_info_t)))
 379                                 return -EFAULT;
 380                         return 0;
 381                 }
 382
 383                 case VTXIOCCLRPAGE:
 384                 {
 385                         vtx_pagereq_t req;
 386
 387                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 388                                 return -EFAULT;
 389                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 390                                 return -EINVAL;
 391                         memset(t->vdau[req.pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 392                         t->vdau[req.pgbuf].clrfound = TRUE;
 393                         return 0;
 394                 }
 395
 396                 case VTXIOCCLRFOUND:
 397                 {
 398                         vtx_pagereq_t req;
 399
 400                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 401                                 return -EFAULT;
 402                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 403                                 return -EINVAL;
 404                         t->vdau[req.pgbuf].clrfound = TRUE;
 405                         return 0;
 406                 }
 407
 408                 case VTXIOCPAGEREQ:
 409                 {
 410                         vtx_pagereq_t req;
 411                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 412                                 return -EFAULT;
 413                         if (!(req.pagemask & PGMASK_PAGE))
 414                                 req.page = 0;
 415                         if (!(req.pagemask & PGMASK_HOUR))
 416                                 req.hour = 0;
 417                         if (!(req.pagemask & PGMASK_MINUTE))
 418                                 req.minute = 0;
 419                         if (req.page < 0 || req.page > 0x8ff) /* 7FF ?? */
 420                                 return -EINVAL;
 421                         req.page &= 0x7ff;
 422                         if (req.hour < 0 || req.hour > 0x3f || req.minute < 0 || req.minute > 0x7f ||
 423                                 req.pagemask < 0 || req.pagemask >= PGMASK_MAX || req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 424                                 return -EINVAL;
 425                         t->vdau[req.pgbuf].sregs[0] = (req.pagemask & PG_HUND ? 0x10 : 0) | (req.page / 0x100);
 426                         t->vdau[req.pgbuf].sregs[1] = (req.pagemask & PG_TEN ? 0x10 : 0) | ((req.page / 0x10) & 0xf);
 427                         t->vdau[req.pgbuf].sregs[2] = (req.pagemask & PG_UNIT ? 0x10 : 0) | (req.page & 0xf);
 428                         t->vdau[req.pgbuf].sregs[3] = (req.pagemask & HR_TEN ? 0x10 : 0) | (req.hour / 0x10);
 429                         t->vdau[req.pgbuf].sregs[4] = (req.pagemask & HR_UNIT ? 0x10 : 0) | (req.hour & 0xf);
 430                         t->vdau[req.pgbuf].sregs[5] = (req.pagemask & MIN_TEN ? 0x10 : 0) | (req.minute / 0x10);
 431                         t->vdau[req.pgbuf].sregs[6] = (req.pagemask & MIN_UNIT ? 0x10 : 0) | (req.minute & 0xf);
 432                         t->vdau[req.pgbuf].stopped = FALSE;
 433                         t->vdau[req.pgbuf].clrfound = TRUE;
 434                         t->is_searching[req.pgbuf] = TRUE;
 435                         return 0;
 436                 }
 437
 438                 case VTXIOCGETSTAT:
 439                 {
 440                         vtx_pagereq_t req;
 441                         u8 infobits[10];
 442                         vtx_pageinfo_t info;
 443                         int a;
 444
 445                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 446                                 return -EFAULT;
 447                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 448                                 return -EINVAL;
 449                         if (!t->vdau[req.pgbuf].stopped)
 450                         {
 451                                 if (i2c_senddata(t, CCTWR, 2, 0, -1) ||
 452                                         i2c_sendbuf(t, CCTWR, 3, sizeof(t->vdau[0].sregs), t->vdau[req.pgbuf].sregs, FALSE) ||
 453                                         i2c_senddata(t, CCTWR, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
 454                                         i2c_senddata(t, CCTWR, 2, 0, t->vdau[req.pgbuf].sregs[0] | 8, -1) ||
 455                                         i2c_senddata(t, CCTWR, 8, 0, 25, 0, -1))
 456                                         return -EIO;
 457                                 jdelay(PAGE_WAIT);
 458                                 if (i2c_getdata(t, CCTRD, 10, infobits, FALSE))
 459                                         return -EIO;
 460
 461                                 if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) &&   /* check FOUND-bit */
 462                                         (memcmp(infobits, t->vdau[req.pgbuf].laststat, sizeof(infobits)) ||
 463                                         time_after_eq(jiffies, t->vdau[req.pgbuf].expire)))
 464                                 {               /* check if new page arrived */
 465                                         if (i2c_senddata(t, CCTWR, 8, 0, 0, 0, -1) ||
 466                                                 i2c_getdata(t, CCTRD, VTX_PAGESIZE, t->vdau[req.pgbuf].pgbuf, FALSE))
 467                                                 return -EIO;
 468                                         t->vdau[req.pgbuf].expire = jiffies + PGBUF_EXPIRE;
 469                                         memset(t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE);
 470                                         if (t->virtual_mode)
 471                                         {
 472                                                 /* Packet X/24 */
 473                                                 if (i2c_senddata(t, CCTWR, 8, 0, 0x20, 0, -1) ||
 474                                                         i2c_getdata(t, CCTRD, 40, t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40, FALSE))
 475                                                         return -EIO;
 476                                                 /* Packet X/27/0 */
 477                                                 if (i2c_senddata(t, CCTWR, 8, 0, 0x21, 0, -1) ||
 478                                                         i2c_getdata(t, CCTRD, 40, t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40, FALSE))
 479                                                         return -EIO;
 480                                                 /* Packet 8/30/0...8/30/15
 481                                                  * FIXME: AFAIK, the 5249 does hamming-decoding for some bytes in packet 8/30,
 482                                                  *        so we should undo this here.
 483                                                  */
 484                                                 if (i2c_senddata(t, CCTWR, 8, 0, 0x22, 0, -1) ||
 485                                                         i2c_getdata(t, CCTRD, 40, t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40, FALSE))
 486                                                         return -EIO;
 487                                         }
 488                                         t->vdau[req.pgbuf].clrfound = FALSE;
 489                                         memcpy(t->vdau[req.pgbuf].laststat, infobits, sizeof(infobits));
 490                                 }
 491                                 else
 492                                 {
 493                                         memcpy(infobits, t->vdau[req.pgbuf].laststat, sizeof(infobits));
 494                                 }
 495                         }
 496                         else
 497                         {
 498                                 memcpy(infobits, t->vdau[req.pgbuf].laststat, sizeof(infobits));
 499                         }
 500
 501                         info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f);
 502                         if (info.pagenum < 0x100)
 503                                 info.pagenum += 0x800;
 504                         info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f);
 505                         info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f);
 506                         info.charset = ((infobits[7] >> 1) & 7);
 507                         info.delete = !!(infobits[3] & 8);
 508                         info.headline = !!(infobits[5] & 4);
 509                         info.subtitle = !!(infobits[5] & 8);
 510                         info.supp_header = !!(infobits[6] & 1);
 511                         info.update = !!(infobits[6] & 2);
 512                         info.inter_seq = !!(infobits[6] & 4);
 513                         info.dis_disp = !!(infobits[6] & 8);
 514                         info.serial = !!(infobits[7] & 1);
 515                         info.notfound = !!(infobits[8] & 0x10);
 516                         info.pblf = !!(infobits[9] & 0x20);
 517                         info.hamming = 0;
 518                         for (a = 0; a <= 7; a++)
 519                         {
 520                                 if (infobits[a] & 0xf0)
 521                                 {
 522                                         info.hamming = 1;
 523                                         break;
 524                                 }
 525                         }
 526                         if (t->vdau[req.pgbuf].clrfound)
 527                                 info.notfound = 1;
 528                         if(copy_to_user(req.buffer, &info, sizeof(vtx_pageinfo_t)))
 529                                 return -EFAULT;
 530                         if (!info.hamming && !info.notfound)
 531                         {
 532                                 t->is_searching[req.pgbuf] = FALSE;
 533                         }
 534                         return 0;
 535                 }
 536
 537                 case VTXIOCGETPAGE:
 538                 {
 539                         vtx_pagereq_t req;
 540                         int start, end;
 541
 542                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 543                                 return -EFAULT;
 544                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS || req.start < 0 ||
 545                                 req.start > req.end || req.end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
 546                                 return -EINVAL;
 547                         if(copy_to_user(req.buffer, &t->vdau[req.pgbuf].pgbuf[req.start], req.end - req.start + 1))
 548                                 return -EFAULT;
 549
 550                          /*
 551                           *     Always read the time directly from SAA5249
 552                           */
 553
 554                         if (req.start <= 39 && req.end >= 32)
 555                         {
 556                                 start = MAX(req.start, 32);
 557                                 end = MIN(req.end, 39);
 558                                 if (i2c_senddata(t, CCTWR, 8, 0, 0, start, -1) ||
 559                                         i2c_getdata(t, CCTRD, end - start + 1, req.buffer + start - req.start, TRUE))
 560                                         return -EIO;
 561                         }
 562                         /* Insert the current header if DAU is still searching for a page */
 563                         if (req.start <= 31 && req.end >= 7 && t->is_searching[req.pgbuf])
 564                         {
 565                                 start = MAX(req.start, 7);
 566                                 end = MIN(req.end, 31);
 567                                 if (i2c_senddata(t, CCTWR, 8, 0, 0, start, -1) ||
 568                                         i2c_getdata(t, CCTRD, end - start + 1, req.buffer + start - req.start, TRUE))
 569                                         return -EIO;
 570                         }
 571                         return 0;
 572                 }
 573
 574                 case VTXIOCSTOPDAU:
 575                 {
 576                         vtx_pagereq_t req;
 577
 578                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 579                                 return -EFAULT;
 580                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 581                                 return -EINVAL;
 582                         t->vdau[req.pgbuf].stopped = TRUE;
 583                         t->is_searching[req.pgbuf] = FALSE;
 584                         return 0;
 585                 }
 586
 587                 case VTXIOCPUTPAGE:
 588                 case VTXIOCSETDISP:
 589                 case VTXIOCPUTSTAT:
 590                         return 0;
 591
 592                 case VTXIOCCLRCACHE:
 593                 {
 594                         if (i2c_senddata(t ,CCTWR, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, CCTWR, 11,
 595                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
 596                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1))
 597                                 return -EIO;
 598                         if (i2c_senddata(t, CCTWR, 3, 0x20, -1))
 599                                 return -EIO;
 600                         jdelay(10 * CLEAR_DELAY);                       /* I have no idea how long we have to wait here */
 601                         return 0;
 602                 }
 603
 604                 case VTXIOCSETVIRT:
 605                 {
 606                         /* The SAA5249 has virtual-row reception turned on always */
 607                         t->virtual_mode = (int)arg;
 608                         return 0;
 609                 }
 610         }
 611         return -EINVAL;
 612 }
 613
 614
 615 static int saa5249_open(struct video_device *vd, int nb)
 616 {
 617         struct saa5249_device *t=vd->priv;
 618         int pgbuf;
 619
 620         if (t->bus==NULL)
 621                 return -ENODEV;
 622
 623         if (i2c_senddata(t, CCTWR, 0, 0, -1) ||         /* Select R11 */
 624                                                 /* Turn off parity checks (we do this ourselves) */
 625                 i2c_senddata(t, CCTWR, 1, disp_modes[t->disp_mode][0], 0, -1) ||
 626                                                 /* Display TV-picture, no virtual rows */
 627                 i2c_senddata(t, CCTWR, 4, NUM_DAUS, disp_modes[t->disp_mode][1], disp_modes[t->disp_mode][2], 7, -1)) /* Set display to page 4 */
 628
 629         {
 630                 return -EIO;
 631         }
 632
 633         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 634         {
 635                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 636                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 637                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 638                 t->vdau[pgbuf].expire = 0;
 639                 t->vdau[pgbuf].clrfound = TRUE;
 640                 t->vdau[pgbuf].stopped = TRUE;
 641                 t->is_searching[pgbuf] = FALSE;
 642         }
 643         t->virtual_mode=FALSE;
 644         MOD_INC_USE_COUNT;
 645         return 0;
 646 }
 647
 648
 649
 650 static void saa5249_release(struct video_device *vd)
 651 {
 652         struct saa5249_device *t=vd->priv;
 653         i2c_senddata(t, CCTWR, 1, 0x20, -1);            /* Turn off CCT */
 654         i2c_senddata(t, CCTWR, 5, 3, 3, -1);            /* Turn off TV-display */
 655         MOD_DEC_USE_COUNT;
 656         return;
 657 }
 658
 659 static long saa5249_write(struct video_device *v, const char *buf, unsigned long l, int nb)
 660 {
 661         return -EINVAL;
 662 }
 663
 664 static long saa5249_read(struct video_device *v, char *buf, unsigned long l, int nb)
 665 {
 666         return -EINVAL;
 667 }
 668
 669 int init_saa_5249(struct video_init *v)
 670 {
 671         printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n",
 672                         VTX_VER_MAJ, VTX_VER_MIN);
 673         i2c_register_driver(&i2c_driver_videotext);
 674
 675         return 0;
 676 }
 677
 678 static struct video_device saa_template=
 679 {
 680         IF_NAME,
 681         VID_TYPE_TELETEXT,      /*| VID_TYPE_TUNER ?? */
 682         VID_HARDWARE_SAA5249,
 683         saa5249_open,
 684         saa5249_release,
 685         saa5249_read,
 686         saa5249_write,
 687         NULL,   /* poll */
 688         saa5249_ioctl,
 689         NULL,
 690         NULL,
 691         NULL,
 692         0,
 693         0
 694 };
 695
 696 #ifdef MODULE
 697
 698 /*
 699  *      Routines for loadable modules
 700  */
 701
 702 int init_module(void)
 703 {
 704         init_saa_5249(NULL);
 705         return 0;
 706 }
 707
 708
 709 void cleanup_module(void)
 710 {
 711         i2c_unregister_driver(&i2c_driver_videotext);
 712 }
 713
 714 #endif