git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/saa5249.c

   1 /*
   2  * Modified in order to keep it compatible both with new and old videotext IOCTLs by
   3  * Michael Geng <linux@MichaelGeng.de>
   4  *
   5  *      Cleaned up to use existing videodev interface and allow the idea
   6  *      of multiple teletext decoders on the video4linux iface. Changed i2c
   7  *      to cover addressing clashes on device busses. It's also rebuilt so
   8  *      you can add arbitary multiple teletext devices to Linux video4linux
   9  *      now (well 32 anyway).
  10  *
  11  *      Alan Cox <Alan.Cox@linux.org>
  12  *
  13  *      The original driver was heavily modified to match the i2c interface
  14  *      It was truncated to use the WinTV boards, too.
  15  *
  16  *      Copyright (c) 1998 Richard Guenther <richard.guenther@student.uni-tuebingen.de>
  17  *
  18  * $Id: saa5249.c,v 1.1 1998/03/30 22:23:23 alan Exp $
  19  *
  20  *      Derived From
  21  *
  22  * vtx.c:
  23  * This is a loadable character-device-driver for videotext-interfaces
  24  * (aka teletext). Please check the Makefile/README for a list of supported
  25  * interfaces.
  26  *
  27  * Copyright (c) 1994-97 Martin Buck  <martin-2.buck@student.uni-ulm.de>
  28  *
  29  *
  30  * This program is free software; you can redistribute it and/or modify
  31  * it under the terms of the GNU General Public License as published by
  32  * the Free Software Foundation; either version 2 of the License, or
  33  * (at your option) any later version.
  34  *
  35  * This program is distributed in the hope that it will be useful,
  36  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  37  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  38  * GNU General Public License for more details.
  39  *
  40  * You should have received a copy of the GNU General Public License
  41  * along with this program; if not, write to the Free Software
  42  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  43  * USA.
  44  */
  45
  46 #include <linux/module.h>
  47 #include <linux/kernel.h>
  48 #include <linux/sched.h>
  49 #include <linux/mm.h>
  50 #include <linux/errno.h>
  51 #include <linux/delay.h>
  52 #include <linux/ioport.h>
  53 #include <linux/slab.h>
  54 #include <linux/init.h>
  55 #include <stdarg.h>
  56 #include <linux/i2c.h>
  57 #include <linux/videotext.h>
  58 #include <linux/videodev.h>
  59
  60 #include <asm/io.h>
  61 #include <asm/uaccess.h>
  62
  63 #define VTX_VER_MAJ 1
  64 #define VTX_VER_MIN 8
  65
  66
  67
  68 #define NUM_DAUS 4
  69 #define NUM_BUFS 8
  70 #define IF_NAME "SAA5249"
  71
  72 static const int disp_modes[8][3] =
  73 {
  74         { 0x46, 0x03, 0x03 },   /* DISPOFF */
  75         { 0x46, 0xcc, 0xcc },   /* DISPNORM */
  76         { 0x44, 0x0f, 0x0f },   /* DISPTRANS */
  77         { 0x46, 0xcc, 0x46 },   /* DISPINS */
  78         { 0x44, 0x03, 0x03 },   /* DISPOFF, interlaced */
  79         { 0x44, 0xcc, 0xcc },   /* DISPNORM, interlaced */
  80         { 0x44, 0x0f, 0x0f },   /* DISPTRANS, interlaced */
  81         { 0x44, 0xcc, 0x46 }    /* DISPINS, interlaced */
  82 };
  83
  84
  85
  86 #define PAGE_WAIT (300*HZ/1000)                 /* Time between requesting page and */
  87                                                 /* checking status bits */
  88 #define PGBUF_EXPIRE (15*HZ)                    /* Time to wait before retransmitting */
  89                                                 /* page regardless of infobits */
  90 typedef struct {
  91         u8 pgbuf[VTX_VIRTUALSIZE];              /* Page-buffer */
  92         u8 laststat[10];                        /* Last value of infobits for DAU */
  93         u8 sregs[7];                            /* Page-request registers */
  94         unsigned long expire;                   /* Time when page will be expired */
  95         unsigned clrfound : 1;                  /* VTXIOCCLRFOUND has been called */
  96         unsigned stopped : 1;                   /* VTXIOCSTOPDAU has been called */
  97 } vdau_t;
  98
  99 struct saa5249_device
 100 {
 101         vdau_t vdau[NUM_DAUS];                  /* Data for virtual DAUs (the 5249 only has one */
 102                                                 /* real DAU, so we have to simulate some more) */
 103         int vtx_use_count;
 104         int is_searching[NUM_DAUS];
 105         int disp_mode;
 106         int virtual_mode;
 107         struct i2c_client *client;
 108         struct semaphore lock;
 109 };
 110
 111
 112 #define CCTWR 34                /* I²C write/read-address of vtx-chip */
 113 #define CCTRD 35
 114 #define NOACK_REPEAT 10         /* Retry access this many times on failure */
 115 #define CLEAR_DELAY (HZ/20)     /* Time required to clear a page */
 116 #define READY_TIMEOUT (30*HZ/1000)      /* Time to wait for ready signal of I²C-bus interface */
 117 #define INIT_DELAY 500          /* Time in usec to wait at initialization of CEA interface */
 118 #define START_DELAY 10          /* Time in usec to wait before starting write-cycle (CEA) */
 119
 120 #define VTX_DEV_MINOR 0
 121
 122 /* General defines and debugging support */
 123
 124 #ifndef FALSE
 125 #define FALSE 0
 126 #define TRUE 1
 127 #endif
 128
 129 #define RESCHED do { cond_resched(); } while(0)
 130
 131 static struct video_device saa_template;        /* Declared near bottom */
 132
 133 /* Addresses to scan */
 134 static unsigned short normal_i2c[] = {34>>1,I2C_CLIENT_END};
 135 I2C_CLIENT_INSMOD;
 136
 137 static struct i2c_client client_template;
 138
 139 static int saa5249_attach(struct i2c_adapter *adap, int addr, int kind)
 140 {
 141         int pgbuf;
 142         int err;
 143         struct i2c_client *client;
 144         struct video_device *vd;
 145         struct saa5249_device *t;
 146
 147         printk(KERN_INFO "saa5249: teletext chip found.\n");
 148         client=kmalloc(sizeof(*client), GFP_KERNEL);
 149         if(client==NULL)
 150                 return -ENOMEM;
 151         client_template.adapter = adap;
 152         client_template.addr = addr;
 153         memcpy(client, &client_template, sizeof(*client));
 154         t = kmalloc(sizeof(*t), GFP_KERNEL);
 155         if(t==NULL)
 156         {
 157                 kfree(client);
 158                 return -ENOMEM;
 159         }
 160         memset(t, 0, sizeof(*t));
 161         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
 162         init_MUTEX(&t->lock);
 163
 164         /*
 165          *      Now create a video4linux device
 166          */
 167
 168         vd = (struct video_device *)kmalloc(sizeof(struct video_device), GFP_KERNEL);
 169         if(vd==NULL)
 170         {
 171                 kfree(t);
 172                 kfree(client);
 173                 return -ENOMEM;
 174         }
 175         i2c_set_clientdata(client, vd);
 176         memcpy(vd, &saa_template, sizeof(*vd));
 177
 178         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 179         {
 180                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 181                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 182                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 183                 t->vdau[pgbuf].expire = 0;
 184                 t->vdau[pgbuf].clrfound = TRUE;
 185                 t->vdau[pgbuf].stopped = TRUE;
 186                 t->is_searching[pgbuf] = FALSE;
 187         }
 188         vd->priv=t;
 189
 190
 191         /*
 192          *      Register it
 193          */
 194
 195         if((err=video_register_device(vd, VFL_TYPE_VTX,-1))<0)
 196         {
 197                 kfree(t);
 198                 kfree(vd);
 199                 kfree(client);
 200                 return err;
 201         }
 202         t->client = client;
 203         i2c_attach_client(client);
 204         return 0;
 205 }
 206
 207 /*
 208  *      We do most of the hard work when we become a device on the i2c.
 209  */
 210
 211 static int saa5249_probe(struct i2c_adapter *adap)
 212 {
 213         if (adap->class & I2C_CLASS_TV_ANALOG)
 214                 return i2c_probe(adap, &addr_data, saa5249_attach);
 215         return 0;
 216 }
 217
 218 static int saa5249_detach(struct i2c_client *client)
 219 {
 220         struct video_device *vd = i2c_get_clientdata(client);
 221         i2c_detach_client(client);
 222         video_unregister_device(vd);
 223         kfree(vd->priv);
 224         kfree(vd);
 225         kfree(client);
 226         return 0;
 227 }
 228
 229 /* new I2C driver support */
 230
 231 static struct i2c_driver i2c_driver_videotext =
 232 {
 233         .driver = {
 234                 .name   = IF_NAME,              /* name */
 235         },
 236         .id             = I2C_DRIVERID_SAA5249, /* in i2c.h */
 237         .attach_adapter = saa5249_probe,
 238         .detach_client  = saa5249_detach,
 239 };
 240
 241 static struct i2c_client client_template = {
 242         .driver         = &i2c_driver_videotext,
 243         .name           = "(unset)",
 244 };
 245
 246 /*
 247  *      Wait the given number of jiffies (10ms). This calls the scheduler, so the actual
 248  *      delay may be longer.
 249  */
 250
 251 static void jdelay(unsigned long delay)
 252 {
 253         sigset_t oldblocked = current->blocked;
 254
 255         spin_lock_irq(&current->sighand->siglock);
 256         sigfillset(&current->blocked);
 257         recalc_sigpending();
 258         spin_unlock_irq(&current->sighand->siglock);
 259         msleep_interruptible(jiffies_to_msecs(delay));
 260
 261         spin_lock_irq(&current->sighand->siglock);
 262         current->blocked = oldblocked;
 263         recalc_sigpending();
 264         spin_unlock_irq(&current->sighand->siglock);
 265 }
 266
 267
 268 /*
 269  *      I2C interfaces
 270  */
 271
 272 static int i2c_sendbuf(struct saa5249_device *t, int reg, int count, u8 *data)
 273 {
 274         char buf[64];
 275
 276         buf[0] = reg;
 277         memcpy(buf+1, data, count);
 278
 279         if(i2c_master_send(t->client, buf, count+1)==count+1)
 280                 return 0;
 281         return -1;
 282 }
 283
 284 static int i2c_senddata(struct saa5249_device *t, ...)
 285 {
 286         unsigned char buf[64];
 287         int v;
 288         int ct=0;
 289         va_list argp;
 290         va_start(argp,t);
 291
 292         while((v=va_arg(argp,int))!=-1)
 293                 buf[ct++]=v;
 294         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 295 }
 296
 297 /* Get count number of bytes from I²C-device at address adr, store them in buf. Start & stop
 298  * handshaking is done by this routine, ack will be sent after the last byte to inhibit further
 299  * sending of data. If uaccess is TRUE, data is written to user-space with put_user.
 300  * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise
 301  */
 302
 303 static int i2c_getdata(struct saa5249_device *t, int count, u8 *buf)
 304 {
 305         if(i2c_master_recv(t->client, buf, count)!=count)
 306                 return -1;
 307         return 0;
 308 }
 309
 310
 311 /*
 312  *      Standard character-device-driver functions
 313  */
 314
 315 static int do_saa5249_ioctl(struct inode *inode, struct file *file,
 316                             unsigned int cmd, void *arg)
 317 {
 318         static int virtual_mode = FALSE;
 319         struct video_device *vd = video_devdata(file);
 320         struct saa5249_device *t=vd->priv;
 321
 322         switch(cmd)
 323         {
 324                 case VTXIOCGETINFO:
 325                 {
 326                         vtx_info_t *info = arg;
 327                         info->version_major = VTX_VER_MAJ;
 328                         info->version_minor = VTX_VER_MIN;
 329                         info->numpages = NUM_DAUS;
 330                         /*info->cct_type = CCT_TYPE;*/
 331                         return 0;
 332                 }
 333
 334                 case VTXIOCCLRPAGE:
 335                 {
 336                         vtx_pagereq_t *req = arg;
 337
 338                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 339                                 return -EINVAL;
 340                         memset(t->vdau[req->pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 341                         t->vdau[req->pgbuf].clrfound = TRUE;
 342                         return 0;
 343                 }
 344
 345                 case VTXIOCCLRFOUND:
 346                 {
 347                         vtx_pagereq_t *req = arg;
 348
 349                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 350                                 return -EINVAL;
 351                         t->vdau[req->pgbuf].clrfound = TRUE;
 352                         return 0;
 353                 }
 354
 355                 case VTXIOCPAGEREQ:
 356                 {
 357                         vtx_pagereq_t *req = arg;
 358                         if (!(req->pagemask & PGMASK_PAGE))
 359                                 req->page = 0;
 360                         if (!(req->pagemask & PGMASK_HOUR))
 361                                 req->hour = 0;
 362                         if (!(req->pagemask & PGMASK_MINUTE))
 363                                 req->minute = 0;
 364                         if (req->page < 0 || req->page > 0x8ff) /* 7FF ?? */
 365                                 return -EINVAL;
 366                         req->page &= 0x7ff;
 367                         if (req->hour < 0 || req->hour > 0x3f || req->minute < 0 || req->minute > 0x7f ||
 368                                 req->pagemask < 0 || req->pagemask >= PGMASK_MAX || req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 369                                 return -EINVAL;
 370                         t->vdau[req->pgbuf].sregs[0] = (req->pagemask & PG_HUND ? 0x10 : 0) | (req->page / 0x100);
 371                         t->vdau[req->pgbuf].sregs[1] = (req->pagemask & PG_TEN ? 0x10 : 0) | ((req->page / 0x10) & 0xf);
 372                         t->vdau[req->pgbuf].sregs[2] = (req->pagemask & PG_UNIT ? 0x10 : 0) | (req->page & 0xf);
 373                         t->vdau[req->pgbuf].sregs[3] = (req->pagemask & HR_TEN ? 0x10 : 0) | (req->hour / 0x10);
 374                         t->vdau[req->pgbuf].sregs[4] = (req->pagemask & HR_UNIT ? 0x10 : 0) | (req->hour & 0xf);
 375                         t->vdau[req->pgbuf].sregs[5] = (req->pagemask & MIN_TEN ? 0x10 : 0) | (req->minute / 0x10);
 376                         t->vdau[req->pgbuf].sregs[6] = (req->pagemask & MIN_UNIT ? 0x10 : 0) | (req->minute & 0xf);
 377                         t->vdau[req->pgbuf].stopped = FALSE;
 378                         t->vdau[req->pgbuf].clrfound = TRUE;
 379                         t->is_searching[req->pgbuf] = TRUE;
 380                         return 0;
 381                 }
 382
 383                 case VTXIOCGETSTAT:
 384                 {
 385                         vtx_pagereq_t *req = arg;
 386                         u8 infobits[10];
 387                         vtx_pageinfo_t info;
 388                         int a;
 389
 390                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 391                                 return -EINVAL;
 392                         if (!t->vdau[req->pgbuf].stopped)
 393                         {
 394                                 if (i2c_senddata(t, 2, 0, -1) ||
 395                                         i2c_sendbuf(t, 3, sizeof(t->vdau[0].sregs), t->vdau[req->pgbuf].sregs) ||
 396                                         i2c_senddata(t, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
 397                                         i2c_senddata(t, 2, 0, t->vdau[req->pgbuf].sregs[0] | 8, -1) ||
 398                                         i2c_senddata(t, 8, 0, 25, 0, -1))
 399                                         return -EIO;
 400                                 jdelay(PAGE_WAIT);
 401                                 if (i2c_getdata(t, 10, infobits))
 402                                         return -EIO;
 403
 404                                 if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) &&   /* check FOUND-bit */
 405                                         (memcmp(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits)) ||
 406                                         time_after_eq(jiffies, t->vdau[req->pgbuf].expire)))
 407                                 {               /* check if new page arrived */
 408                                         if (i2c_senddata(t, 8, 0, 0, 0, -1) ||
 409                                                 i2c_getdata(t, VTX_PAGESIZE, t->vdau[req->pgbuf].pgbuf))
 410                                                 return -EIO;
 411                                         t->vdau[req->pgbuf].expire = jiffies + PGBUF_EXPIRE;
 412                                         memset(t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE);
 413                                         if (t->virtual_mode)
 414                                         {
 415                                                 /* Packet X/24 */
 416                                                 if (i2c_senddata(t, 8, 0, 0x20, 0, -1) ||
 417                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40))
 418                                                         return -EIO;
 419                                                 /* Packet X/27/0 */
 420                                                 if (i2c_senddata(t, 8, 0, 0x21, 0, -1) ||
 421                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40))
 422                                                         return -EIO;
 423                                                 /* Packet 8/30/0...8/30/15
 424                                                  * FIXME: AFAIK, the 5249 does hamming-decoding for some bytes in packet 8/30,
 425                                                  *        so we should undo this here.
 426                                                  */
 427                                                 if (i2c_senddata(t, 8, 0, 0x22, 0, -1) ||
 428                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40))
 429                                                         return -EIO;
 430                                         }
 431                                         t->vdau[req->pgbuf].clrfound = FALSE;
 432                                         memcpy(t->vdau[req->pgbuf].laststat, infobits, sizeof(infobits));
 433                                 }
 434                                 else
 435                                 {
 436                                         memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
 437                                 }
 438                         }
 439                         else
 440                         {
 441                                 memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
 442                         }
 443
 444                         info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f);
 445                         if (info.pagenum < 0x100)
 446                                 info.pagenum += 0x800;
 447                         info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f);
 448                         info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f);
 449                         info.charset = ((infobits[7] >> 1) & 7);
 450                         info.delete = !!(infobits[3] & 8);
 451                         info.headline = !!(infobits[5] & 4);
 452                         info.subtitle = !!(infobits[5] & 8);
 453                         info.supp_header = !!(infobits[6] & 1);
 454                         info.update = !!(infobits[6] & 2);
 455                         info.inter_seq = !!(infobits[6] & 4);
 456                         info.dis_disp = !!(infobits[6] & 8);
 457                         info.serial = !!(infobits[7] & 1);
 458                         info.notfound = !!(infobits[8] & 0x10);
 459                         info.pblf = !!(infobits[9] & 0x20);
 460                         info.hamming = 0;
 461                         for (a = 0; a <= 7; a++)
 462                         {
 463                                 if (infobits[a] & 0xf0)
 464                                 {
 465                                         info.hamming = 1;
 466                                         break;
 467                                 }
 468                         }
 469                         if (t->vdau[req->pgbuf].clrfound)
 470                                 info.notfound = 1;
 471                         if(copy_to_user(req->buffer, &info, sizeof(vtx_pageinfo_t)))
 472                                 return -EFAULT;
 473                         if (!info.hamming && !info.notfound)
 474                         {
 475                                 t->is_searching[req->pgbuf] = FALSE;
 476                         }
 477                         return 0;
 478                 }
 479
 480                 case VTXIOCGETPAGE:
 481                 {
 482                         vtx_pagereq_t *req = arg;
 483                         int start, end;
 484
 485                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || req->start < 0 ||
 486                                 req->start > req->end || req->end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
 487                                 return -EINVAL;
 488                         if(copy_to_user(req->buffer, &t->vdau[req->pgbuf].pgbuf[req->start], req->end - req->start + 1))
 489                                 return -EFAULT;
 490
 491                          /*
 492                           *     Always read the time directly from SAA5249
 493                           */
 494
 495                         if (req->start <= 39 && req->end >= 32)
 496                         {
 497                                 int len;
 498                                 char buf[16];
 499                                 start = max(req->start, 32);
 500                                 end = min(req->end, 39);
 501                                 len=end-start+1;
 502                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 503                                         i2c_getdata(t, len, buf))
 504                                         return -EIO;
 505                                 if(copy_to_user(req->buffer+start-req->start, buf, len))
 506                                         return -EFAULT;
 507                         }
 508                         /* Insert the current header if DAU is still searching for a page */
 509                         if (req->start <= 31 && req->end >= 7 && t->is_searching[req->pgbuf])
 510                         {
 511                                 char buf[32];
 512                                 int len;
 513                                 start = max(req->start, 7);
 514                                 end = min(req->end, 31);
 515                                 len=end-start+1;
 516                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 517                                         i2c_getdata(t, len, buf))
 518                                         return -EIO;
 519                                 if(copy_to_user(req->buffer+start-req->start, buf, len))
 520                                         return -EFAULT;
 521                         }
 522                         return 0;
 523                 }
 524
 525                 case VTXIOCSTOPDAU:
 526                 {
 527                         vtx_pagereq_t *req = arg;
 528
 529                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 530                                 return -EINVAL;
 531                         t->vdau[req->pgbuf].stopped = TRUE;
 532                         t->is_searching[req->pgbuf] = FALSE;
 533                         return 0;
 534                 }
 535
 536                 case VTXIOCPUTPAGE:
 537                 case VTXIOCSETDISP:
 538                 case VTXIOCPUTSTAT:
 539                         return 0;
 540
 541                 case VTXIOCCLRCACHE:
 542                 {
 543                         if (i2c_senddata(t, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
 544                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
 545                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1))
 546                                 return -EIO;
 547                         if (i2c_senddata(t, 3, 0x20, -1))
 548                                 return -EIO;
 549                         jdelay(10 * CLEAR_DELAY);                       /* I have no idea how long we have to wait here */
 550                         return 0;
 551                 }
 552
 553                 case VTXIOCSETVIRT:
 554                 {
 555                         /* The SAA5249 has virtual-row reception turned on always */
 556                         t->virtual_mode = (int)(long)arg;
 557                         return 0;
 558                 }
 559         }
 560         return -EINVAL;
 561 }
 562
 563 /*
 564  * Translates old vtx IOCTLs to new ones
 565  *
 566  * This keeps new kernel versions compatible with old userspace programs.
 567  */
 568 static inline unsigned int vtx_fix_command(unsigned int cmd)
 569 {
 570         switch (cmd) {
 571         case VTXIOCGETINFO_OLD:
 572                 cmd = VTXIOCGETINFO;
 573                 break;
 574         case VTXIOCCLRPAGE_OLD:
 575                 cmd = VTXIOCCLRPAGE;
 576                 break;
 577         case VTXIOCCLRFOUND_OLD:
 578                 cmd = VTXIOCCLRFOUND;
 579                 break;
 580         case VTXIOCPAGEREQ_OLD:
 581                 cmd = VTXIOCPAGEREQ;
 582                 break;
 583         case VTXIOCGETSTAT_OLD:
 584                 cmd = VTXIOCGETSTAT;
 585                 break;
 586         case VTXIOCGETPAGE_OLD:
 587                 cmd = VTXIOCGETPAGE;
 588                 break;
 589         case VTXIOCSTOPDAU_OLD:
 590                 cmd = VTXIOCSTOPDAU;
 591                 break;
 592         case VTXIOCPUTPAGE_OLD:
 593                 cmd = VTXIOCPUTPAGE;
 594                 break;
 595         case VTXIOCSETDISP_OLD:
 596                 cmd = VTXIOCSETDISP;
 597                 break;
 598         case VTXIOCPUTSTAT_OLD:
 599                 cmd = VTXIOCPUTSTAT;
 600                 break;
 601         case VTXIOCCLRCACHE_OLD:
 602                 cmd = VTXIOCCLRCACHE;
 603                 break;
 604         case VTXIOCSETVIRT_OLD:
 605                 cmd = VTXIOCSETVIRT;
 606                 break;
 607         }
 608         return cmd;
 609 }
 610
 611 /*
 612  *      Handle the locking
 613  */
 614
 615 static int saa5249_ioctl(struct inode *inode, struct file *file,
 616                          unsigned int cmd, unsigned long arg)
 617 {
 618         struct video_device *vd = video_devdata(file);
 619         struct saa5249_device *t=vd->priv;
 620         int err;
 621
 622         cmd = vtx_fix_command(cmd);
 623         down(&t->lock);
 624         err = video_usercopy(inode,file,cmd,arg,do_saa5249_ioctl);
 625         up(&t->lock);
 626         return err;
 627 }
 628
 629 static int saa5249_open(struct inode *inode, struct file *file)
 630 {
 631         struct video_device *vd = video_devdata(file);
 632         struct saa5249_device *t=vd->priv;
 633         int err,pgbuf;
 634
 635         err = video_exclusive_open(inode,file);
 636         if (err < 0)
 637                 return err;
 638
 639         if (t->client==NULL) {
 640                 err = -ENODEV;
 641                 goto fail;
 642         }
 643
 644         if (i2c_senddata(t, 0, 0, -1) ||                /* Select R11 */
 645                                                 /* Turn off parity checks (we do this ourselves) */
 646                 i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
 647                                                 /* Display TV-picture, no virtual rows */
 648                 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 */
 649
 650         {
 651                 err = -EIO;
 652                 goto fail;
 653         }
 654
 655         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 656         {
 657                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 658                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 659                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 660                 t->vdau[pgbuf].expire = 0;
 661                 t->vdau[pgbuf].clrfound = TRUE;
 662                 t->vdau[pgbuf].stopped = TRUE;
 663                 t->is_searching[pgbuf] = FALSE;
 664         }
 665         t->virtual_mode=FALSE;
 666         return 0;
 667
 668  fail:
 669         video_exclusive_release(inode,file);
 670         return err;
 671 }
 672
 673
 674
 675 static int saa5249_release(struct inode *inode, struct file *file)
 676 {
 677         struct video_device *vd = video_devdata(file);
 678         struct saa5249_device *t=vd->priv;
 679         i2c_senddata(t, 1, 0x20, -1);           /* Turn off CCT */
 680         i2c_senddata(t, 5, 3, 3, -1);           /* Turn off TV-display */
 681         video_exclusive_release(inode,file);
 682         return 0;
 683 }
 684
 685 static int __init init_saa_5249 (void)
 686 {
 687         printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n",
 688                         VTX_VER_MAJ, VTX_VER_MIN);
 689         return i2c_add_driver(&i2c_driver_videotext);
 690 }
 691
 692 static void __exit cleanup_saa_5249 (void)
 693 {
 694         i2c_del_driver(&i2c_driver_videotext);
 695 }
 696
 697 module_init(init_saa_5249);
 698 module_exit(cleanup_saa_5249);
 699
 700 static struct file_operations saa_fops = {
 701         .owner          = THIS_MODULE,
 702         .open           = saa5249_open,
 703         .release        = saa5249_release,
 704         .ioctl          = saa5249_ioctl,
 705         .llseek         = no_llseek,
 706 };
 707
 708 static struct video_device saa_template =
 709 {
 710         .owner          = THIS_MODULE,
 711         .name           = IF_NAME,
 712         .type           = VID_TYPE_TELETEXT,    /*| VID_TYPE_TUNER ?? */
 713         .hardware       = VID_HARDWARE_SAA5249,
 714         .fops           = &saa_fops,
 715 };
 716
 717 MODULE_LICENSE("GPL");