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 #include <linux/kernel.h>
  45 #include <linux/sched.h>
  46 #include <linux/mm.h>
  47 #include <linux/errno.h>
  48 #include <linux/delay.h>
  49 #include <linux/ioport.h>
  50 #include <linux/slab.h>
  51 #include <linux/init.h>
  52 #include <stdarg.h>
  53 #include <linux/i2c.h>
  54 #include <linux/videotext.h>
  55 #include <linux/videodev.h>
  56
  57 #include <asm/io.h>
  58 #include <asm/uaccess.h>
  59
  60 #define VTX_VER_MAJ 1
  61 #define VTX_VER_MIN 7
  62
  63
  64
  65 #define NUM_DAUS 4
  66 #define NUM_BUFS 8
  67 #define IF_NAME "SAA5249"
  68
  69 static const int disp_modes[8][3] =
  70 {
  71         { 0x46, 0x03, 0x03 },   /* DISPOFF */
  72         { 0x46, 0xcc, 0xcc },   /* DISPNORM */
  73         { 0x44, 0x0f, 0x0f },   /* DISPTRANS */
  74         { 0x46, 0xcc, 0x46 },   /* DISPINS */
  75         { 0x44, 0x03, 0x03 },   /* DISPOFF, interlaced */
  76         { 0x44, 0xcc, 0xcc },   /* DISPNORM, interlaced */
  77         { 0x44, 0x0f, 0x0f },   /* DISPTRANS, interlaced */
  78         { 0x44, 0xcc, 0x46 }    /* DISPINS, interlaced */
  79 };
  80
  81
  82
  83 #define PAGE_WAIT (300*HZ/1000)                 /* Time between requesting page and */
  84                                                 /* checking status bits */
  85 #define PGBUF_EXPIRE (15*HZ)                    /* Time to wait before retransmitting */
  86                                                 /* page regardless of infobits */
  87 typedef struct {
  88         u8 pgbuf[VTX_VIRTUALSIZE];              /* Page-buffer */
  89         u8 laststat[10];                        /* Last value of infobits for DAU */
  90         u8 sregs[7];                            /* Page-request registers */
  91         unsigned long expire;                   /* Time when page will be expired */
  92         unsigned clrfound : 1;                  /* VTXIOCCLRFOUND has been called */
  93         unsigned stopped : 1;                   /* VTXIOCSTOPDAU has been called */
  94 } vdau_t;
  95
  96 struct saa5249_device
  97 {
  98         vdau_t vdau[NUM_DAUS];                  /* Data for virtual DAUs (the 5249 only has one */
  99                                                 /* real DAU, so we have to simulate some more) */
 100         int vtx_use_count;
 101         int is_searching[NUM_DAUS];
 102         int disp_mode;
 103         int virtual_mode;
 104         struct i2c_client *client;
 105 };
 106
 107
 108 #define CCTWR 34                /* I²C write/read-address of vtx-chip */
 109 #define CCTRD 35
 110 #define NOACK_REPEAT 10         /* Retry access this many times on failure */
 111 #define CLEAR_DELAY (HZ/20)     /* Time required to clear a page */
 112 #define READY_TIMEOUT (30*HZ/1000)      /* Time 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 /* Addresses to scan */
 138 static unsigned short normal_i2c[] = {34>>1,I2C_CLIENT_END};
 139 static unsigned short normal_i2c_range[] = {I2C_CLIENT_END};
 140 static unsigned short probe[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
 141 static unsigned short probe_range[2]  = { I2C_CLIENT_END, I2C_CLIENT_END };
 142 static unsigned short ignore[2]       = { I2C_CLIENT_END, I2C_CLIENT_END };
 143 static unsigned short ignore_range[2] = { I2C_CLIENT_END, I2C_CLIENT_END };
 144 static unsigned short force[2]        = { I2C_CLIENT_END, I2C_CLIENT_END };
 145
 146 static struct i2c_client_address_data addr_data = {
 147         normal_i2c, normal_i2c_range,
 148         probe, probe_range,
 149         ignore, ignore_range,
 150         force
 151 };
 152
 153 static struct i2c_client client_template;
 154
 155 static int saa5249_attach(struct i2c_adapter *adap, int addr, unsigned short flags, int kind)
 156 {
 157         int pgbuf;
 158         int err;
 159         struct i2c_client *client;
 160         struct video_device *vd;
 161         struct saa5249_device *t;
 162
 163         printk(KERN_INFO "saa5249: teletext chip found.\n");
 164         client=kmalloc(sizeof(*client), GFP_KERNEL);
 165         if(client==NULL)
 166                 return -ENOMEM;
 167         client_template.adapter = adap;
 168         client_template.addr = addr;
 169         memcpy(client, &client_template, sizeof(*client));
 170         t = kmalloc(sizeof(*t), GFP_KERNEL);
 171         if(t==NULL)
 172         {
 173                 kfree(client);
 174                 return -ENOMEM;
 175         }
 176         memset(t, 0, sizeof(*t));
 177         strcpy(client->name, IF_NAME);
 178
 179         /*
 180          *      Now create a video4linux device
 181          */
 182
 183         client->data = vd=(struct video_device *)kmalloc(sizeof(struct video_device), GFP_KERNEL);
 184         if(vd==NULL)
 185         {
 186                 kfree(t);
 187                 kfree(client);
 188                 return -ENOMEM;
 189         }
 190         memcpy(vd, &saa_template, sizeof(*vd));
 191
 192         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 193         {
 194                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 195                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 196                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 197                 t->vdau[pgbuf].expire = 0;
 198                 t->vdau[pgbuf].clrfound = TRUE;
 199                 t->vdau[pgbuf].stopped = TRUE;
 200                 t->is_searching[pgbuf] = FALSE;
 201         }
 202         vd->priv=t;
 203
 204         /*
 205          *      Register it
 206          */
 207
 208         if((err=video_register_device(vd, VFL_TYPE_VTX))<0)
 209         {
 210                 kfree(t);
 211                 kfree(vd);
 212                 kfree(client);
 213                 return err;
 214         }
 215         t->client = client;
 216         i2c_attach_client(client);
 217         MOD_INC_USE_COUNT;
 218         return 0;
 219 }
 220
 221 /*
 222  *      We do most of the hard work when we become a device on the i2c.
 223  */
 224
 225 static int saa5249_probe(struct i2c_adapter *adap)
 226 {
 227         /* Only attach these chips to the BT848 bus for now */
 228
 229         if (adap->id == (I2C_ALGO_BIT | I2C_HW_B_BT848))
 230         {
 231                 return i2c_probe(adap, &addr_data, saa5249_attach);
 232         }
 233         return 0;
 234 }
 235
 236 static int saa5249_detach(struct i2c_client *client)
 237 {
 238         struct video_device *vd=client->data;
 239         i2c_detach_client(client);
 240         video_unregister_device(vd);
 241         kfree(vd->priv);
 242         kfree(vd);
 243         kfree(client);
 244         MOD_DEC_USE_COUNT;
 245         return 0;
 246 }
 247
 248 static int saa5249_command(struct i2c_client *device,
 249                              unsigned int cmd, void *arg)
 250 {
 251         return -EINVAL;
 252 }
 253
 254 /* new I2C driver support */
 255
 256 static struct i2c_driver i2c_driver_videotext =
 257 {
 258         IF_NAME,                /* name */
 259         I2C_DRIVERID_SAA5249, /* in i2c.h */
 260         I2C_DF_NOTIFY,
 261         saa5249_probe,
 262         saa5249_detach,
 263         saa5249_command
 264 };
 265
 266 static struct i2c_client client_template = {
 267         "(unset)",
 268         -1,
 269         0,
 270         0,
 271         NULL,
 272         &i2c_driver_videotext
 273 };
 274
 275 /*
 276  *      Wait the given number of jiffies (10ms). This calls the scheduler, so the actual
 277  *      delay may be longer.
 278  */
 279
 280 static void jdelay(unsigned long delay)
 281 {
 282         sigset_t oldblocked = current->blocked;
 283
 284         spin_lock_irq(&current->sigmask_lock);
 285         sigfillset(&current->blocked);
 286         recalc_sigpending(current);
 287         spin_unlock_irq(&current->sigmask_lock);
 288         current->state = TASK_INTERRUPTIBLE;
 289         schedule_timeout(delay);
 290
 291         spin_lock_irq(&current->sigmask_lock);
 292         current->blocked = oldblocked;
 293         recalc_sigpending(current);
 294         spin_unlock_irq(&current->sigmask_lock);
 295 }
 296
 297
 298 /*
 299  *      I2C interfaces
 300  */
 301
 302 static int i2c_sendbuf(struct saa5249_device *t, int reg, int count, u8 *data)
 303 {
 304         char buf[64];
 305
 306         buf[0] = reg;
 307         memcpy(buf+1, data, count);
 308
 309         if(i2c_master_send(t->client, buf, count+1)==count+1)
 310                 return 0;
 311         return -1;
 312 }
 313
 314 static int i2c_senddata(struct saa5249_device *t, ...)
 315 {
 316         unsigned char buf[64];
 317         int v;
 318         int ct=0;
 319         va_list argp;
 320         va_start(argp,t);
 321
 322         while((v=va_arg(argp,int))!=-1)
 323                 buf[ct++]=v;
 324         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 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 count, u8 *buf)
 334 {
 335         if(i2c_master_recv(t->client, buf, count)!=count)
 336                 return -1;
 337         return 0;
 338 }
 339
 340
 341 /*
 342  *      Standard character-device-driver functions
 343  */
 344
 345 static int saa5249_ioctl(struct video_device *vd, unsigned int cmd, void *arg)
 346 {
 347         struct saa5249_device *t=vd->priv;
 348         static int virtual_mode = FALSE;
 349
 350         switch(cmd)
 351         {
 352                 case VTXIOCGETINFO:
 353                 {
 354                         vtx_info_t info;
 355                         info.version_major = VTX_VER_MAJ;
 356                         info.version_minor = VTX_VER_MIN;
 357                         info.numpages = NUM_DAUS;
 358                         /*info.cct_type = CCT_TYPE;*/
 359                         if(copy_to_user((void*)arg, &info, sizeof(vtx_info_t)))
 360                                 return -EFAULT;
 361                         return 0;
 362                 }
 363
 364                 case VTXIOCCLRPAGE:
 365                 {
 366                         vtx_pagereq_t req;
 367
 368                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 369                                 return -EFAULT;
 370                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 371                                 return -EINVAL;
 372                         memset(t->vdau[req.pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 373                         t->vdau[req.pgbuf].clrfound = TRUE;
 374                         return 0;
 375                 }
 376
 377                 case VTXIOCCLRFOUND:
 378                 {
 379                         vtx_pagereq_t req;
 380
 381                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 382                                 return -EFAULT;
 383                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 384                                 return -EINVAL;
 385                         t->vdau[req.pgbuf].clrfound = TRUE;
 386                         return 0;
 387                 }
 388
 389                 case VTXIOCPAGEREQ:
 390                 {
 391                         vtx_pagereq_t req;
 392                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 393                                 return -EFAULT;
 394                         if (!(req.pagemask & PGMASK_PAGE))
 395                                 req.page = 0;
 396                         if (!(req.pagemask & PGMASK_HOUR))
 397                                 req.hour = 0;
 398                         if (!(req.pagemask & PGMASK_MINUTE))
 399                                 req.minute = 0;
 400                         if (req.page < 0 || req.page > 0x8ff) /* 7FF ?? */
 401                                 return -EINVAL;
 402                         req.page &= 0x7ff;
 403                         if (req.hour < 0 || req.hour > 0x3f || req.minute < 0 || req.minute > 0x7f ||
 404                                 req.pagemask < 0 || req.pagemask >= PGMASK_MAX || req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 405                                 return -EINVAL;
 406                         t->vdau[req.pgbuf].sregs[0] = (req.pagemask & PG_HUND ? 0x10 : 0) | (req.page / 0x100);
 407                         t->vdau[req.pgbuf].sregs[1] = (req.pagemask & PG_TEN ? 0x10 : 0) | ((req.page / 0x10) & 0xf);
 408                         t->vdau[req.pgbuf].sregs[2] = (req.pagemask & PG_UNIT ? 0x10 : 0) | (req.page & 0xf);
 409                         t->vdau[req.pgbuf].sregs[3] = (req.pagemask & HR_TEN ? 0x10 : 0) | (req.hour / 0x10);
 410                         t->vdau[req.pgbuf].sregs[4] = (req.pagemask & HR_UNIT ? 0x10 : 0) | (req.hour & 0xf);
 411                         t->vdau[req.pgbuf].sregs[5] = (req.pagemask & MIN_TEN ? 0x10 : 0) | (req.minute / 0x10);
 412                         t->vdau[req.pgbuf].sregs[6] = (req.pagemask & MIN_UNIT ? 0x10 : 0) | (req.minute & 0xf);
 413                         t->vdau[req.pgbuf].stopped = FALSE;
 414                         t->vdau[req.pgbuf].clrfound = TRUE;
 415                         t->is_searching[req.pgbuf] = TRUE;
 416                         return 0;
 417                 }
 418
 419                 case VTXIOCGETSTAT:
 420                 {
 421                         vtx_pagereq_t req;
 422                         u8 infobits[10];
 423                         vtx_pageinfo_t info;
 424                         int a;
 425
 426                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 427                                 return -EFAULT;
 428                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 429                                 return -EINVAL;
 430                         if (!t->vdau[req.pgbuf].stopped)
 431                         {
 432                                 if (i2c_senddata(t, 2, 0, -1) ||
 433                                         i2c_sendbuf(t, 3, sizeof(t->vdau[0].sregs), t->vdau[req.pgbuf].sregs) ||
 434                                         i2c_senddata(t, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
 435                                         i2c_senddata(t, 2, 0, t->vdau[req.pgbuf].sregs[0] | 8, -1) ||
 436                                         i2c_senddata(t, 8, 0, 25, 0, -1))
 437                                         return -EIO;
 438                                 jdelay(PAGE_WAIT);
 439                                 if (i2c_getdata(t, 10, infobits))
 440                                         return -EIO;
 441
 442                                 if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) &&   /* check FOUND-bit */
 443                                         (memcmp(infobits, t->vdau[req.pgbuf].laststat, sizeof(infobits)) ||
 444                                         time_after_eq(jiffies, t->vdau[req.pgbuf].expire)))
 445                                 {               /* check if new page arrived */
 446                                         if (i2c_senddata(t, 8, 0, 0, 0, -1) ||
 447                                                 i2c_getdata(t, VTX_PAGESIZE, t->vdau[req.pgbuf].pgbuf))
 448                                                 return -EIO;
 449                                         t->vdau[req.pgbuf].expire = jiffies + PGBUF_EXPIRE;
 450                                         memset(t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE);
 451                                         if (t->virtual_mode)
 452                                         {
 453                                                 /* Packet X/24 */
 454                                                 if (i2c_senddata(t, 8, 0, 0x20, 0, -1) ||
 455                                                         i2c_getdata(t, 40, t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40))
 456                                                         return -EIO;
 457                                                 /* Packet X/27/0 */
 458                                                 if (i2c_senddata(t, 8, 0, 0x21, 0, -1) ||
 459                                                         i2c_getdata(t, 40, t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40))
 460                                                         return -EIO;
 461                                                 /* Packet 8/30/0...8/30/15
 462                                                  * FIXME: AFAIK, the 5249 does hamming-decoding for some bytes in packet 8/30,
 463                                                  *        so we should undo this here.
 464                                                  */
 465                                                 if (i2c_senddata(t, 8, 0, 0x22, 0, -1) ||
 466                                                         i2c_getdata(t, 40, t->vdau[req.pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40))
 467                                                         return -EIO;
 468                                         }
 469                                         t->vdau[req.pgbuf].clrfound = FALSE;
 470                                         memcpy(t->vdau[req.pgbuf].laststat, infobits, sizeof(infobits));
 471                                 }
 472                                 else
 473                                 {
 474                                         memcpy(infobits, t->vdau[req.pgbuf].laststat, sizeof(infobits));
 475                                 }
 476                         }
 477                         else
 478                         {
 479                                 memcpy(infobits, t->vdau[req.pgbuf].laststat, sizeof(infobits));
 480                         }
 481
 482                         info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f);
 483                         if (info.pagenum < 0x100)
 484                                 info.pagenum += 0x800;
 485                         info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f);
 486                         info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f);
 487                         info.charset = ((infobits[7] >> 1) & 7);
 488                         info.delete = !!(infobits[3] & 8);
 489                         info.headline = !!(infobits[5] & 4);
 490                         info.subtitle = !!(infobits[5] & 8);
 491                         info.supp_header = !!(infobits[6] & 1);
 492                         info.update = !!(infobits[6] & 2);
 493                         info.inter_seq = !!(infobits[6] & 4);
 494                         info.dis_disp = !!(infobits[6] & 8);
 495                         info.serial = !!(infobits[7] & 1);
 496                         info.notfound = !!(infobits[8] & 0x10);
 497                         info.pblf = !!(infobits[9] & 0x20);
 498                         info.hamming = 0;
 499                         for (a = 0; a <= 7; a++)
 500                         {
 501                                 if (infobits[a] & 0xf0)
 502                                 {
 503                                         info.hamming = 1;
 504                                         break;
 505                                 }
 506                         }
 507                         if (t->vdau[req.pgbuf].clrfound)
 508                                 info.notfound = 1;
 509                         if(copy_to_user(req.buffer, &info, sizeof(vtx_pageinfo_t)))
 510                                 return -EFAULT;
 511                         if (!info.hamming && !info.notfound)
 512                         {
 513                                 t->is_searching[req.pgbuf] = FALSE;
 514                         }
 515                         return 0;
 516                 }
 517
 518                 case VTXIOCGETPAGE:
 519                 {
 520                         vtx_pagereq_t req;
 521                         int start, end;
 522
 523                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 524                                 return -EFAULT;
 525                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS || req.start < 0 ||
 526                                 req.start > req.end || req.end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
 527                                 return -EINVAL;
 528                         if(copy_to_user(req.buffer, &t->vdau[req.pgbuf].pgbuf[req.start], req.end - req.start + 1))
 529                                 return -EFAULT;
 530
 531                          /*
 532                           *     Always read the time directly from SAA5249
 533                           */
 534
 535                         if (req.start <= 39 && req.end >= 32)
 536                         {
 537                                 int len;
 538                                 char buf[16];
 539                                 start = MAX(req.start, 32);
 540                                 end = MIN(req.end, 39);
 541                                 len=end-start+1;
 542                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 543                                         i2c_getdata(t, len, buf))
 544                                         return -EIO;
 545                                 if(copy_to_user(req.buffer+start-req.start, buf, len))
 546                                         return -EFAULT;
 547                         }
 548                         /* Insert the current header if DAU is still searching for a page */
 549                         if (req.start <= 31 && req.end >= 7 && t->is_searching[req.pgbuf])
 550                         {
 551                                 char buf[32];
 552                                 int len;
 553                                 start = MAX(req.start, 7);
 554                                 end = MIN(req.end, 31);
 555                                 len=end-start+1;
 556                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 557                                         i2c_getdata(t, len, buf))
 558                                         return -EIO;
 559                                 if(copy_to_user(req.buffer+start-req.start, buf, len))
 560                                         return -EFAULT;
 561                         }
 562                         return 0;
 563                 }
 564
 565                 case VTXIOCSTOPDAU:
 566                 {
 567                         vtx_pagereq_t req;
 568
 569                         if(copy_from_user(&req, (void*)arg, sizeof(vtx_pagereq_t)))
 570                                 return -EFAULT;
 571                         if (req.pgbuf < 0 || req.pgbuf >= NUM_DAUS)
 572                                 return -EINVAL;
 573                         t->vdau[req.pgbuf].stopped = TRUE;
 574                         t->is_searching[req.pgbuf] = FALSE;
 575                         return 0;
 576                 }
 577
 578                 case VTXIOCPUTPAGE:
 579                 case VTXIOCSETDISP:
 580                 case VTXIOCPUTSTAT:
 581                         return 0;
 582
 583                 case VTXIOCCLRCACHE:
 584                 {
 585                         if (i2c_senddata(t, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
 586                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
 587                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1))
 588                                 return -EIO;
 589                         if (i2c_senddata(t, 3, 0x20, -1))
 590                                 return -EIO;
 591                         jdelay(10 * CLEAR_DELAY);                       /* I have no idea how long we have to wait here */
 592                         return 0;
 593                 }
 594
 595                 case VTXIOCSETVIRT:
 596                 {
 597                         /* The SAA5249 has virtual-row reception turned on always */
 598                         t->virtual_mode = (int)arg;
 599                         return 0;
 600                 }
 601         }
 602         return -EINVAL;
 603 }
 604
 605
 606 static int saa5249_open(struct video_device *vd, int nb)
 607 {
 608         struct saa5249_device *t=vd->priv;
 609         int pgbuf;
 610
 611         if (t->client==NULL)
 612                 return -ENODEV;
 613
 614         if (i2c_senddata(t, 0, 0, -1) ||                /* Select R11 */
 615                                                 /* Turn off parity checks (we do this ourselves) */
 616                 i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
 617                                                 /* Display TV-picture, no virtual rows */
 618                 i2c_senddata(t, 4, NUM_DAUS, disp_modes[t->disp_mode][1], disp_modes[t->disp_mode][2], 7, -1)) /* Set display to page 4 */
 619
 620         {
 621                 return -EIO;
 622         }
 623
 624         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 625         {
 626                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 627                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 628                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 629                 t->vdau[pgbuf].expire = 0;
 630                 t->vdau[pgbuf].clrfound = TRUE;
 631                 t->vdau[pgbuf].stopped = TRUE;
 632                 t->is_searching[pgbuf] = FALSE;
 633         }
 634         t->virtual_mode=FALSE;
 635         MOD_INC_USE_COUNT;
 636         return 0;
 637 }
 638
 639
 640
 641 static void saa5249_release(struct video_device *vd)
 642 {
 643         struct saa5249_device *t=vd->priv;
 644         i2c_senddata(t, 1, 0x20, -1);           /* Turn off CCT */
 645         i2c_senddata(t, 5, 3, 3, -1);           /* Turn off TV-display */
 646         MOD_DEC_USE_COUNT;
 647         return;
 648 }
 649
 650 static long saa5249_write(struct video_device *v, const char *buf, unsigned long l, int nb)
 651 {
 652         return -EINVAL;
 653 }
 654
 655 static int __init init_saa_5249 (void)
 656 {
 657         printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n",
 658                         VTX_VER_MAJ, VTX_VER_MIN);
 659         return i2c_add_driver(&i2c_driver_videotext);
 660 }
 661
 662 static void __exit cleanup_saa_5249 (void)
 663 {
 664         i2c_del_driver(&i2c_driver_videotext);
 665 }
 666
 667 module_init(init_saa_5249);
 668 module_exit(cleanup_saa_5249);
 669
 670 static struct video_device saa_template =
 671 {
 672         IF_NAME,
 673         VID_TYPE_TELETEXT,      /*| VID_TYPE_TUNER ?? */
 674         VID_HARDWARE_SAA5249,
 675         saa5249_open,
 676         saa5249_release,
 677         NULL,                   /* read */
 678         saa5249_write,
 679         NULL,                   /* poll */
 680         saa5249_ioctl,
 681         /* the rest are null */
 682 };
 683