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 <linux/smp_lock.h>
  56 #include <stdarg.h>
  57 #include <linux/i2c.h>
  58 #include <linux/videotext.h>
  59 #include <linux/videodev.h>
  60 #include <media/v4l2-common.h>
  61 #include <media/v4l2-ioctl.h>
  62 #include <linux/mutex.h>
  63
  64
  65 #include <asm/io.h>
  66 #include <asm/uaccess.h>
  67
  68 #define VTX_VER_MAJ 1
  69 #define VTX_VER_MIN 8
  70
  71
  72
  73 #define NUM_DAUS 4
  74 #define NUM_BUFS 8
  75 #define IF_NAME "SAA5249"
  76
  77 static const int disp_modes[8][3] =
  78 {
  79         { 0x46, 0x03, 0x03 },   /* DISPOFF */
  80         { 0x46, 0xcc, 0xcc },   /* DISPNORM */
  81         { 0x44, 0x0f, 0x0f },   /* DISPTRANS */
  82         { 0x46, 0xcc, 0x46 },   /* DISPINS */
  83         { 0x44, 0x03, 0x03 },   /* DISPOFF, interlaced */
  84         { 0x44, 0xcc, 0xcc },   /* DISPNORM, interlaced */
  85         { 0x44, 0x0f, 0x0f },   /* DISPTRANS, interlaced */
  86         { 0x44, 0xcc, 0x46 }    /* DISPINS, interlaced */
  87 };
  88
  89
  90
  91 #define PAGE_WAIT    msecs_to_jiffies(300)      /* Time between requesting page and */
  92                                                 /* checking status bits */
  93 #define PGBUF_EXPIRE msecs_to_jiffies(15000)    /* Time to wait before retransmitting */
  94                                                 /* page regardless of infobits */
  95 typedef struct {
  96         u8 pgbuf[VTX_VIRTUALSIZE];              /* Page-buffer */
  97         u8 laststat[10];                        /* Last value of infobits for DAU */
  98         u8 sregs[7];                            /* Page-request registers */
  99         unsigned long expire;                   /* Time when page will be expired */
 100         unsigned clrfound : 1;                  /* VTXIOCCLRFOUND has been called */
 101         unsigned stopped : 1;                   /* VTXIOCSTOPDAU has been called */
 102 } vdau_t;
 103
 104 struct saa5249_device
 105 {
 106         vdau_t vdau[NUM_DAUS];                  /* Data for virtual DAUs (the 5249 only has one */
 107                                                 /* real DAU, so we have to simulate some more) */
 108         int vtx_use_count;
 109         int is_searching[NUM_DAUS];
 110         int disp_mode;
 111         int virtual_mode;
 112         struct i2c_client *client;
 113         struct mutex lock;
 114 };
 115
 116
 117 #define CCTWR 34                /* I²C write/read-address of vtx-chip */
 118 #define CCTRD 35
 119 #define NOACK_REPEAT 10         /* Retry access this many times on failure */
 120 #define CLEAR_DELAY   msecs_to_jiffies(50)      /* Time required to clear a page */
 121 #define READY_TIMEOUT msecs_to_jiffies(30)      /* Time to wait for ready signal of I2C-bus interface */
 122 #define INIT_DELAY 500          /* Time in usec to wait at initialization of CEA interface */
 123 #define START_DELAY 10          /* Time in usec to wait before starting write-cycle (CEA) */
 124
 125 #define VTX_DEV_MINOR 0
 126
 127 /* General defines and debugging support */
 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
 136 I2C_CLIENT_INSMOD;
 137
 138 static struct i2c_client client_template;
 139
 140 static int saa5249_attach(struct i2c_adapter *adap, int addr, int kind)
 141 {
 142         int pgbuf;
 143         int err;
 144         struct i2c_client *client;
 145         struct video_device *vd;
 146         struct saa5249_device *t;
 147
 148         printk(KERN_INFO "saa5249: teletext chip found.\n");
 149         client=kmalloc(sizeof(*client), GFP_KERNEL);
 150         if(client==NULL)
 151                 return -ENOMEM;
 152         client_template.adapter = adap;
 153         client_template.addr = addr;
 154         memcpy(client, &client_template, sizeof(*client));
 155         t = kzalloc(sizeof(*t), GFP_KERNEL);
 156         if(t==NULL)
 157         {
 158                 kfree(client);
 159                 return -ENOMEM;
 160         }
 161         strlcpy(client->name, IF_NAME, I2C_NAME_SIZE);
 162         mutex_init(&t->lock);
 163
 164         /*
 165          *      Now create a video4linux device
 166          */
 167
 168         vd = 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
 295         va_end(argp);
 296         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 297 }
 298
 299 /* Get count number of bytes from I²C-device at address adr, store them in buf. Start & stop
 300  * handshaking is done by this routine, ack will be sent after the last byte to inhibit further
 301  * sending of data. If uaccess is 'true', data is written to user-space with put_user.
 302  * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise
 303  */
 304
 305 static int i2c_getdata(struct saa5249_device *t, int count, u8 *buf)
 306 {
 307         if(i2c_master_recv(t->client, buf, count)!=count)
 308                 return -1;
 309         return 0;
 310 }
 311
 312
 313 /*
 314  *      Standard character-device-driver functions
 315  */
 316
 317 static int do_saa5249_ioctl(struct inode *inode, struct file *file,
 318                             unsigned int cmd, void *arg)
 319 {
 320         static int virtual_mode = false;
 321         struct video_device *vd = video_devdata(file);
 322         struct saa5249_device *t=vd->priv;
 323
 324         switch(cmd)
 325         {
 326                 case VTXIOCGETINFO:
 327                 {
 328                         vtx_info_t *info = arg;
 329                         info->version_major = VTX_VER_MAJ;
 330                         info->version_minor = VTX_VER_MIN;
 331                         info->numpages = NUM_DAUS;
 332                         /*info->cct_type = CCT_TYPE;*/
 333                         return 0;
 334                 }
 335
 336                 case VTXIOCCLRPAGE:
 337                 {
 338                         vtx_pagereq_t *req = arg;
 339
 340                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 341                                 return -EINVAL;
 342                         memset(t->vdau[req->pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 343                         t->vdau[req->pgbuf].clrfound = true;
 344                         return 0;
 345                 }
 346
 347                 case VTXIOCCLRFOUND:
 348                 {
 349                         vtx_pagereq_t *req = arg;
 350
 351                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 352                                 return -EINVAL;
 353                         t->vdau[req->pgbuf].clrfound = true;
 354                         return 0;
 355                 }
 356
 357                 case VTXIOCPAGEREQ:
 358                 {
 359                         vtx_pagereq_t *req = arg;
 360                         if (!(req->pagemask & PGMASK_PAGE))
 361                                 req->page = 0;
 362                         if (!(req->pagemask & PGMASK_HOUR))
 363                                 req->hour = 0;
 364                         if (!(req->pagemask & PGMASK_MINUTE))
 365                                 req->minute = 0;
 366                         if (req->page < 0 || req->page > 0x8ff) /* 7FF ?? */
 367                                 return -EINVAL;
 368                         req->page &= 0x7ff;
 369                         if (req->hour < 0 || req->hour > 0x3f || req->minute < 0 || req->minute > 0x7f ||
 370                                 req->pagemask < 0 || req->pagemask >= PGMASK_MAX || req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 371                                 return -EINVAL;
 372                         t->vdau[req->pgbuf].sregs[0] = (req->pagemask & PG_HUND ? 0x10 : 0) | (req->page / 0x100);
 373                         t->vdau[req->pgbuf].sregs[1] = (req->pagemask & PG_TEN ? 0x10 : 0) | ((req->page / 0x10) & 0xf);
 374                         t->vdau[req->pgbuf].sregs[2] = (req->pagemask & PG_UNIT ? 0x10 : 0) | (req->page & 0xf);
 375                         t->vdau[req->pgbuf].sregs[3] = (req->pagemask & HR_TEN ? 0x10 : 0) | (req->hour / 0x10);
 376                         t->vdau[req->pgbuf].sregs[4] = (req->pagemask & HR_UNIT ? 0x10 : 0) | (req->hour & 0xf);
 377                         t->vdau[req->pgbuf].sregs[5] = (req->pagemask & MIN_TEN ? 0x10 : 0) | (req->minute / 0x10);
 378                         t->vdau[req->pgbuf].sregs[6] = (req->pagemask & MIN_UNIT ? 0x10 : 0) | (req->minute & 0xf);
 379                         t->vdau[req->pgbuf].stopped = false;
 380                         t->vdau[req->pgbuf].clrfound = true;
 381                         t->is_searching[req->pgbuf] = true;
 382                         return 0;
 383                 }
 384
 385                 case VTXIOCGETSTAT:
 386                 {
 387                         vtx_pagereq_t *req = arg;
 388                         u8 infobits[10];
 389                         vtx_pageinfo_t info;
 390                         int a;
 391
 392                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 393                                 return -EINVAL;
 394                         if (!t->vdau[req->pgbuf].stopped)
 395                         {
 396                                 if (i2c_senddata(t, 2, 0, -1) ||
 397                                         i2c_sendbuf(t, 3, sizeof(t->vdau[0].sregs), t->vdau[req->pgbuf].sregs) ||
 398                                         i2c_senddata(t, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
 399                                         i2c_senddata(t, 2, 0, t->vdau[req->pgbuf].sregs[0] | 8, -1) ||
 400                                         i2c_senddata(t, 8, 0, 25, 0, -1))
 401                                         return -EIO;
 402                                 jdelay(PAGE_WAIT);
 403                                 if (i2c_getdata(t, 10, infobits))
 404                                         return -EIO;
 405
 406                                 if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) &&   /* check FOUND-bit */
 407                                         (memcmp(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits)) ||
 408                                         time_after_eq(jiffies, t->vdau[req->pgbuf].expire)))
 409                                 {               /* check if new page arrived */
 410                                         if (i2c_senddata(t, 8, 0, 0, 0, -1) ||
 411                                                 i2c_getdata(t, VTX_PAGESIZE, t->vdau[req->pgbuf].pgbuf))
 412                                                 return -EIO;
 413                                         t->vdau[req->pgbuf].expire = jiffies + PGBUF_EXPIRE;
 414                                         memset(t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE);
 415                                         if (t->virtual_mode)
 416                                         {
 417                                                 /* Packet X/24 */
 418                                                 if (i2c_senddata(t, 8, 0, 0x20, 0, -1) ||
 419                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40))
 420                                                         return -EIO;
 421                                                 /* Packet X/27/0 */
 422                                                 if (i2c_senddata(t, 8, 0, 0x21, 0, -1) ||
 423                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40))
 424                                                         return -EIO;
 425                                                 /* Packet 8/30/0...8/30/15
 426                                                  * FIXME: AFAIK, the 5249 does hamming-decoding for some bytes in packet 8/30,
 427                                                  *        so we should undo this here.
 428                                                  */
 429                                                 if (i2c_senddata(t, 8, 0, 0x22, 0, -1) ||
 430                                                         i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40))
 431                                                         return -EIO;
 432                                         }
 433                                         t->vdau[req->pgbuf].clrfound = false;
 434                                         memcpy(t->vdau[req->pgbuf].laststat, infobits, sizeof(infobits));
 435                                 }
 436                                 else
 437                                 {
 438                                         memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
 439                                 }
 440                         }
 441                         else
 442                         {
 443                                 memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
 444                         }
 445
 446                         info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f);
 447                         if (info.pagenum < 0x100)
 448                                 info.pagenum += 0x800;
 449                         info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f);
 450                         info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f);
 451                         info.charset = ((infobits[7] >> 1) & 7);
 452                         info.delete = !!(infobits[3] & 8);
 453                         info.headline = !!(infobits[5] & 4);
 454                         info.subtitle = !!(infobits[5] & 8);
 455                         info.supp_header = !!(infobits[6] & 1);
 456                         info.update = !!(infobits[6] & 2);
 457                         info.inter_seq = !!(infobits[6] & 4);
 458                         info.dis_disp = !!(infobits[6] & 8);
 459                         info.serial = !!(infobits[7] & 1);
 460                         info.notfound = !!(infobits[8] & 0x10);
 461                         info.pblf = !!(infobits[9] & 0x20);
 462                         info.hamming = 0;
 463                         for (a = 0; a <= 7; a++)
 464                         {
 465                                 if (infobits[a] & 0xf0)
 466                                 {
 467                                         info.hamming = 1;
 468                                         break;
 469                                 }
 470                         }
 471                         if (t->vdau[req->pgbuf].clrfound)
 472                                 info.notfound = 1;
 473                         if(copy_to_user(req->buffer, &info, sizeof(vtx_pageinfo_t)))
 474                                 return -EFAULT;
 475                         if (!info.hamming && !info.notfound)
 476                         {
 477                                 t->is_searching[req->pgbuf] = false;
 478                         }
 479                         return 0;
 480                 }
 481
 482                 case VTXIOCGETPAGE:
 483                 {
 484                         vtx_pagereq_t *req = arg;
 485                         int start, end;
 486
 487                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || req->start < 0 ||
 488                                 req->start > req->end || req->end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
 489                                 return -EINVAL;
 490                         if(copy_to_user(req->buffer, &t->vdau[req->pgbuf].pgbuf[req->start], req->end - req->start + 1))
 491                                 return -EFAULT;
 492
 493                          /*
 494                           *     Always read the time directly from SAA5249
 495                           */
 496
 497                         if (req->start <= 39 && req->end >= 32)
 498                         {
 499                                 int len;
 500                                 char buf[16];
 501                                 start = max(req->start, 32);
 502                                 end = min(req->end, 39);
 503                                 len=end-start+1;
 504                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 505                                         i2c_getdata(t, len, buf))
 506                                         return -EIO;
 507                                 if(copy_to_user(req->buffer+start-req->start, buf, len))
 508                                         return -EFAULT;
 509                         }
 510                         /* Insert the current header if DAU is still searching for a page */
 511                         if (req->start <= 31 && req->end >= 7 && t->is_searching[req->pgbuf])
 512                         {
 513                                 char buf[32];
 514                                 int len;
 515                                 start = max(req->start, 7);
 516                                 end = min(req->end, 31);
 517                                 len=end-start+1;
 518                                 if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 519                                         i2c_getdata(t, len, buf))
 520                                         return -EIO;
 521                                 if(copy_to_user(req->buffer+start-req->start, buf, len))
 522                                         return -EFAULT;
 523                         }
 524                         return 0;
 525                 }
 526
 527                 case VTXIOCSTOPDAU:
 528                 {
 529                         vtx_pagereq_t *req = arg;
 530
 531                         if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 532                                 return -EINVAL;
 533                         t->vdau[req->pgbuf].stopped = true;
 534                         t->is_searching[req->pgbuf] = false;
 535                         return 0;
 536                 }
 537
 538                 case VTXIOCPUTPAGE:
 539                 case VTXIOCSETDISP:
 540                 case VTXIOCPUTSTAT:
 541                         return 0;
 542
 543                 case VTXIOCCLRCACHE:
 544                 {
 545                         if (i2c_senddata(t, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
 546                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',
 547                                 ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ', -1))
 548                                 return -EIO;
 549                         if (i2c_senddata(t, 3, 0x20, -1))
 550                                 return -EIO;
 551                         jdelay(10 * CLEAR_DELAY);                       /* I have no idea how long we have to wait here */
 552                         return 0;
 553                 }
 554
 555                 case VTXIOCSETVIRT:
 556                 {
 557                         /* The SAA5249 has virtual-row reception turned on always */
 558                         t->virtual_mode = (int)(long)arg;
 559                         return 0;
 560                 }
 561         }
 562         return -EINVAL;
 563 }
 564
 565 /*
 566  * Translates old vtx IOCTLs to new ones
 567  *
 568  * This keeps new kernel versions compatible with old userspace programs.
 569  */
 570 static inline unsigned int vtx_fix_command(unsigned int cmd)
 571 {
 572         switch (cmd) {
 573         case VTXIOCGETINFO_OLD:
 574                 cmd = VTXIOCGETINFO;
 575                 break;
 576         case VTXIOCCLRPAGE_OLD:
 577                 cmd = VTXIOCCLRPAGE;
 578                 break;
 579         case VTXIOCCLRFOUND_OLD:
 580                 cmd = VTXIOCCLRFOUND;
 581                 break;
 582         case VTXIOCPAGEREQ_OLD:
 583                 cmd = VTXIOCPAGEREQ;
 584                 break;
 585         case VTXIOCGETSTAT_OLD:
 586                 cmd = VTXIOCGETSTAT;
 587                 break;
 588         case VTXIOCGETPAGE_OLD:
 589                 cmd = VTXIOCGETPAGE;
 590                 break;
 591         case VTXIOCSTOPDAU_OLD:
 592                 cmd = VTXIOCSTOPDAU;
 593                 break;
 594         case VTXIOCPUTPAGE_OLD:
 595                 cmd = VTXIOCPUTPAGE;
 596                 break;
 597         case VTXIOCSETDISP_OLD:
 598                 cmd = VTXIOCSETDISP;
 599                 break;
 600         case VTXIOCPUTSTAT_OLD:
 601                 cmd = VTXIOCPUTSTAT;
 602                 break;
 603         case VTXIOCCLRCACHE_OLD:
 604                 cmd = VTXIOCCLRCACHE;
 605                 break;
 606         case VTXIOCSETVIRT_OLD:
 607                 cmd = VTXIOCSETVIRT;
 608                 break;
 609         }
 610         return cmd;
 611 }
 612
 613 /*
 614  *      Handle the locking
 615  */
 616
 617 static int saa5249_ioctl(struct inode *inode, struct file *file,
 618                          unsigned int cmd, unsigned long arg)
 619 {
 620         struct video_device *vd = video_devdata(file);
 621         struct saa5249_device *t=vd->priv;
 622         int err;
 623
 624         cmd = vtx_fix_command(cmd);
 625         mutex_lock(&t->lock);
 626         err = video_usercopy(inode,file,cmd,arg,do_saa5249_ioctl);
 627         mutex_unlock(&t->lock);
 628         return err;
 629 }
 630
 631 static int saa5249_open(struct inode *inode, struct file *file)
 632 {
 633         struct video_device *vd = video_devdata(file);
 634         struct saa5249_device *t=vd->priv;
 635         int err,pgbuf;
 636
 637         lock_kernel();
 638         err = video_exclusive_open(inode,file);
 639         if (err < 0) {
 640                 unlock_kernel();
 641                 return err;
 642         }
 643
 644         if (t->client==NULL) {
 645                 err = -ENODEV;
 646                 goto fail;
 647         }
 648
 649         if (i2c_senddata(t, 0, 0, -1) ||                /* Select R11 */
 650                                                 /* Turn off parity checks (we do this ourselves) */
 651                 i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
 652                                                 /* Display TV-picture, no virtual rows */
 653                 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 */
 654
 655         {
 656                 err = -EIO;
 657                 goto fail;
 658         }
 659
 660         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++)
 661         {
 662                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 663                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 664                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 665                 t->vdau[pgbuf].expire = 0;
 666                 t->vdau[pgbuf].clrfound = true;
 667                 t->vdau[pgbuf].stopped = true;
 668                 t->is_searching[pgbuf] = false;
 669         }
 670         t->virtual_mode = false;
 671         unlock_kernel();
 672         return 0;
 673
 674  fail:
 675         video_exclusive_release(inode,file);
 676         unlock_kernel();
 677         return err;
 678 }
 679
 680
 681
 682 static int saa5249_release(struct inode *inode, struct file *file)
 683 {
 684         struct video_device *vd = video_devdata(file);
 685         struct saa5249_device *t=vd->priv;
 686         i2c_senddata(t, 1, 0x20, -1);           /* Turn off CCT */
 687         i2c_senddata(t, 5, 3, 3, -1);           /* Turn off TV-display */
 688         video_exclusive_release(inode,file);
 689         return 0;
 690 }
 691
 692 static int __init init_saa_5249 (void)
 693 {
 694         printk(KERN_INFO "SAA5249 driver (" IF_NAME " interface) for VideoText version %d.%d\n",
 695                         VTX_VER_MAJ, VTX_VER_MIN);
 696         return i2c_add_driver(&i2c_driver_videotext);
 697 }
 698
 699 static void __exit cleanup_saa_5249 (void)
 700 {
 701         i2c_del_driver(&i2c_driver_videotext);
 702 }
 703
 704 module_init(init_saa_5249);
 705 module_exit(cleanup_saa_5249);
 706
 707 static const struct file_operations saa_fops = {
 708         .owner          = THIS_MODULE,
 709         .open           = saa5249_open,
 710         .release        = saa5249_release,
 711         .ioctl          = saa5249_ioctl,
 712 #ifdef CONFIG_COMPAT
 713         .compat_ioctl   = v4l_compat_ioctl32,
 714 #endif
 715         .llseek         = no_llseek,
 716 };
 717
 718 static struct video_device saa_template =
 719 {
 720         .name           = IF_NAME,
 721         .fops           = &saa_fops,
 722 };
 723
 724 MODULE_LICENSE("GPL");