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@lxorguk.ukuu.org.uk>
  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  *      Derived From
  19  *
  20  * vtx.c:
  21  * This is a loadable character-device-driver for videotext-interfaces
  22  * (aka teletext). Please check the Makefile/README for a list of supported
  23  * interfaces.
  24  *
  25  * Copyright (c) 1994-97 Martin Buck  <martin-2.buck@student.uni-ulm.de>
  26  *
  27  *
  28  * This program is free software; you can redistribute it and/or modify
  29  * it under the terms of the GNU General Public License as published by
  30  * the Free Software Foundation; either version 2 of the License, or
  31  * (at your option) any later version.
  32  *
  33  * This program is distributed in the hope that it will be useful,
  34  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  35  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  36  * GNU General Public License for more details.
  37  *
  38  * You should have received a copy of the GNU General Public License
  39  * along with this program; if not, write to the Free Software
  40  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  41  * USA.
  42  */
  43
  44 #include <linux/module.h>
  45 #include <linux/kernel.h>
  46 #include <linux/mm.h>
  47 #include <linux/init.h>
  48 #include <linux/i2c.h>
  49 #include <linux/mutex.h>
  50 #include <linux/delay.h>
  51 #include <linux/videotext.h>
  52 #include <linux/videodev2.h>
  53 #include <linux/slab.h>
  54 #include <media/v4l2-device.h>
  55 #include <media/v4l2-chip-ident.h>
  56 #include <media/v4l2-ioctl.h>
  57 #include <media/v4l2-i2c-drv.h>
  58
  59 MODULE_AUTHOR("Michael Geng <linux@MichaelGeng.de>");
  60 MODULE_DESCRIPTION("Philips SAA5249 Teletext decoder driver");
  61 MODULE_LICENSE("GPL");
  62
  63
  64 #define VTX_VER_MAJ 1
  65 #define VTX_VER_MIN 8
  66
  67
  68 #define NUM_DAUS 4
  69 #define NUM_BUFS 8
  70
  71 static const int disp_modes[8][3] =
  72 {
  73         { 0x46, 0x03, 0x03 },   /* DISPOFF */
  74         { 0x46, 0xcc, 0xcc },   /* DISPNORM */
  75         { 0x44, 0x0f, 0x0f },   /* DISPTRANS */
  76         { 0x46, 0xcc, 0x46 },   /* DISPINS */
  77         { 0x44, 0x03, 0x03 },   /* DISPOFF, interlaced */
  78         { 0x44, 0xcc, 0xcc },   /* DISPNORM, interlaced */
  79         { 0x44, 0x0f, 0x0f },   /* DISPTRANS, interlaced */
  80         { 0x44, 0xcc, 0x46 }    /* DISPINS, interlaced */
  81 };
  82
  83
  84
  85 #define PAGE_WAIT    msecs_to_jiffies(300)      /* Time between requesting page and */
  86                                                 /* checking status bits */
  87 #define PGBUF_EXPIRE msecs_to_jiffies(15000)    /* Time to wait before retransmitting */
  88                                                 /* page regardless of infobits */
  89 typedef struct {
  90         u8 pgbuf[VTX_VIRTUALSIZE];              /* Page-buffer */
  91         u8 laststat[10];                        /* Last value of infobits for DAU */
  92         u8 sregs[7];                            /* Page-request registers */
  93         unsigned long expire;                   /* Time when page will be expired */
  94         unsigned clrfound : 1;                  /* VTXIOCCLRFOUND has been called */
  95         unsigned stopped : 1;                   /* VTXIOCSTOPDAU has been called */
  96 } vdau_t;
  97
  98 struct saa5249_device
  99 {
 100         struct v4l2_subdev sd;
 101         struct video_device *vdev;
 102         vdau_t vdau[NUM_DAUS];                  /* Data for virtual DAUs (the 5249 only has one */
 103                                                 /* real DAU, so we have to simulate some more) */
 104         int vtx_use_count;
 105         int is_searching[NUM_DAUS];
 106         int disp_mode;
 107         int virtual_mode;
 108         unsigned long in_use;
 109         struct mutex lock;
 110 };
 111
 112 static inline struct saa5249_device *to_dev(struct v4l2_subdev *sd)
 113 {
 114         return container_of(sd, struct saa5249_device, sd);
 115 }
 116
 117
 118 #define CCTWR 34                /* I²C write/read-address of vtx-chip */
 119 #define CCTRD 35
 120 #define NOACK_REPEAT 10         /* Retry access this many times on failure */
 121 #define CLEAR_DELAY   msecs_to_jiffies(50)      /* Time required to clear a page */
 122 #define READY_TIMEOUT msecs_to_jiffies(30)      /* Time to wait for ready signal of I2C-bus interface */
 123 #define INIT_DELAY 500          /* Time in usec to wait at initialization of CEA interface */
 124 #define START_DELAY 10          /* Time in usec to wait before starting write-cycle (CEA) */
 125
 126 #define VTX_DEV_MINOR 0
 127
 128 static struct video_device saa_template;        /* Declared near bottom */
 129
 130 /*
 131  *      Wait the given number of jiffies (10ms). This calls the scheduler, so the actual
 132  *      delay may be longer.
 133  */
 134
 135 static void jdelay(unsigned long delay)
 136 {
 137         sigset_t oldblocked = current->blocked;
 138
 139         spin_lock_irq(&current->sighand->siglock);
 140         sigfillset(&current->blocked);
 141         recalc_sigpending();
 142         spin_unlock_irq(&current->sighand->siglock);
 143         msleep_interruptible(jiffies_to_msecs(delay));
 144
 145         spin_lock_irq(&current->sighand->siglock);
 146         current->blocked = oldblocked;
 147         recalc_sigpending();
 148         spin_unlock_irq(&current->sighand->siglock);
 149 }
 150
 151
 152 /*
 153  *      I2C interfaces
 154  */
 155
 156 static int i2c_sendbuf(struct saa5249_device *t, int reg, int count, u8 *data)
 157 {
 158         struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
 159         char buf[64];
 160
 161         buf[0] = reg;
 162         memcpy(buf+1, data, count);
 163
 164         if (i2c_master_send(client, buf, count + 1) == count + 1)
 165                 return 0;
 166         return -1;
 167 }
 168
 169 static int i2c_senddata(struct saa5249_device *t, ...)
 170 {
 171         unsigned char buf[64];
 172         int v;
 173         int ct = 0;
 174         va_list argp;
 175         va_start(argp,t);
 176
 177         while ((v = va_arg(argp, int)) != -1)
 178                 buf[ct++] = v;
 179
 180         va_end(argp);
 181         return i2c_sendbuf(t, buf[0], ct-1, buf+1);
 182 }
 183
 184 /* Get count number of bytes from I²C-device at address adr, store them in buf. Start & stop
 185  * handshaking is done by this routine, ack will be sent after the last byte to inhibit further
 186  * sending of data. If uaccess is 'true', data is written to user-space with put_user.
 187  * Returns -1 if I²C-device didn't send acknowledge, 0 otherwise
 188  */
 189
 190 static int i2c_getdata(struct saa5249_device *t, int count, u8 *buf)
 191 {
 192         struct i2c_client *client = v4l2_get_subdevdata(&t->sd);
 193
 194         if (i2c_master_recv(client, buf, count) != count)
 195                 return -1;
 196         return 0;
 197 }
 198
 199
 200 /*
 201  *      Standard character-device-driver functions
 202  */
 203
 204 static long do_saa5249_ioctl(struct file *file, unsigned int cmd, void *arg)
 205 {
 206         static int virtual_mode = false;
 207         struct saa5249_device *t = video_drvdata(file);
 208
 209         switch (cmd) {
 210         case VTXIOCGETINFO:
 211         {
 212                 vtx_info_t *info = arg;
 213                 info->version_major = VTX_VER_MAJ;
 214                 info->version_minor = VTX_VER_MIN;
 215                 info->numpages = NUM_DAUS;
 216                 /*info->cct_type = CCT_TYPE;*/
 217                 return 0;
 218         }
 219
 220         case VTXIOCCLRPAGE:
 221         {
 222                 vtx_pagereq_t *req = arg;
 223
 224                 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 225                         return -EINVAL;
 226                 memset(t->vdau[req->pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 227                 t->vdau[req->pgbuf].clrfound = true;
 228                 return 0;
 229         }
 230
 231         case VTXIOCCLRFOUND:
 232         {
 233                 vtx_pagereq_t *req = arg;
 234
 235                 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 236                         return -EINVAL;
 237                 t->vdau[req->pgbuf].clrfound = true;
 238                 return 0;
 239         }
 240
 241         case VTXIOCPAGEREQ:
 242         {
 243                 vtx_pagereq_t *req = arg;
 244                 if (!(req->pagemask & PGMASK_PAGE))
 245                         req->page = 0;
 246                 if (!(req->pagemask & PGMASK_HOUR))
 247                         req->hour = 0;
 248                 if (!(req->pagemask & PGMASK_MINUTE))
 249                         req->minute = 0;
 250                 if (req->page < 0 || req->page > 0x8ff) /* 7FF ?? */
 251                         return -EINVAL;
 252                 req->page &= 0x7ff;
 253                 if (req->hour < 0 || req->hour > 0x3f || req->minute < 0 || req->minute > 0x7f ||
 254                         req->pagemask < 0 || req->pagemask >= PGMASK_MAX || req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 255                         return -EINVAL;
 256                 t->vdau[req->pgbuf].sregs[0] = (req->pagemask & PG_HUND ? 0x10 : 0) | (req->page / 0x100);
 257                 t->vdau[req->pgbuf].sregs[1] = (req->pagemask & PG_TEN ? 0x10 : 0) | ((req->page / 0x10) & 0xf);
 258                 t->vdau[req->pgbuf].sregs[2] = (req->pagemask & PG_UNIT ? 0x10 : 0) | (req->page & 0xf);
 259                 t->vdau[req->pgbuf].sregs[3] = (req->pagemask & HR_TEN ? 0x10 : 0) | (req->hour / 0x10);
 260                 t->vdau[req->pgbuf].sregs[4] = (req->pagemask & HR_UNIT ? 0x10 : 0) | (req->hour & 0xf);
 261                 t->vdau[req->pgbuf].sregs[5] = (req->pagemask & MIN_TEN ? 0x10 : 0) | (req->minute / 0x10);
 262                 t->vdau[req->pgbuf].sregs[6] = (req->pagemask & MIN_UNIT ? 0x10 : 0) | (req->minute & 0xf);
 263                 t->vdau[req->pgbuf].stopped = false;
 264                 t->vdau[req->pgbuf].clrfound = true;
 265                 t->is_searching[req->pgbuf] = true;
 266                 return 0;
 267         }
 268
 269         case VTXIOCGETSTAT:
 270         {
 271                 vtx_pagereq_t *req = arg;
 272                 u8 infobits[10];
 273                 vtx_pageinfo_t info;
 274                 int a;
 275
 276                 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 277                         return -EINVAL;
 278                 if (!t->vdau[req->pgbuf].stopped) {
 279                         if (i2c_senddata(t, 2, 0, -1) ||
 280                                 i2c_sendbuf(t, 3, sizeof(t->vdau[0].sregs), t->vdau[req->pgbuf].sregs) ||
 281                                 i2c_senddata(t, 8, 0, 25, 0, ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ', -1) ||
 282                                 i2c_senddata(t, 2, 0, t->vdau[req->pgbuf].sregs[0] | 8, -1) ||
 283                                 i2c_senddata(t, 8, 0, 25, 0, -1))
 284                                 return -EIO;
 285                         jdelay(PAGE_WAIT);
 286                         if (i2c_getdata(t, 10, infobits))
 287                                 return -EIO;
 288
 289                         if (!(infobits[8] & 0x10) && !(infobits[7] & 0xf0) &&   /* check FOUND-bit */
 290                                 (memcmp(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits)) ||
 291                                 time_after_eq(jiffies, t->vdau[req->pgbuf].expire)))
 292                         {               /* check if new page arrived */
 293                                 if (i2c_senddata(t, 8, 0, 0, 0, -1) ||
 294                                         i2c_getdata(t, VTX_PAGESIZE, t->vdau[req->pgbuf].pgbuf))
 295                                         return -EIO;
 296                                 t->vdau[req->pgbuf].expire = jiffies + PGBUF_EXPIRE;
 297                                 memset(t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE, ' ', VTX_VIRTUALSIZE - VTX_PAGESIZE);
 298                                 if (t->virtual_mode) {
 299                                         /* Packet X/24 */
 300                                         if (i2c_senddata(t, 8, 0, 0x20, 0, -1) ||
 301                                                 i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 20 * 40))
 302                                                 return -EIO;
 303                                         /* Packet X/27/0 */
 304                                         if (i2c_senddata(t, 8, 0, 0x21, 0, -1) ||
 305                                                 i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 16 * 40))
 306                                                 return -EIO;
 307                                         /* Packet 8/30/0...8/30/15
 308                                          * FIXME: AFAIK, the 5249 does hamming-decoding for some bytes in packet 8/30,
 309                                          *        so we should undo this here.
 310                                          */
 311                                         if (i2c_senddata(t, 8, 0, 0x22, 0, -1) ||
 312                                                 i2c_getdata(t, 40, t->vdau[req->pgbuf].pgbuf + VTX_PAGESIZE + 23 * 40))
 313                                                 return -EIO;
 314                                 }
 315                                 t->vdau[req->pgbuf].clrfound = false;
 316                                 memcpy(t->vdau[req->pgbuf].laststat, infobits, sizeof(infobits));
 317                         } else {
 318                                 memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
 319                         }
 320                 } else {
 321                         memcpy(infobits, t->vdau[req->pgbuf].laststat, sizeof(infobits));
 322                 }
 323
 324                 info.pagenum = ((infobits[8] << 8) & 0x700) | ((infobits[1] << 4) & 0xf0) | (infobits[0] & 0x0f);
 325                 if (info.pagenum < 0x100)
 326                         info.pagenum += 0x800;
 327                 info.hour = ((infobits[5] << 4) & 0x30) | (infobits[4] & 0x0f);
 328                 info.minute = ((infobits[3] << 4) & 0x70) | (infobits[2] & 0x0f);
 329                 info.charset = ((infobits[7] >> 1) & 7);
 330                 info.delete = !!(infobits[3] & 8);
 331                 info.headline = !!(infobits[5] & 4);
 332                 info.subtitle = !!(infobits[5] & 8);
 333                 info.supp_header = !!(infobits[6] & 1);
 334                 info.update = !!(infobits[6] & 2);
 335                 info.inter_seq = !!(infobits[6] & 4);
 336                 info.dis_disp = !!(infobits[6] & 8);
 337                 info.serial = !!(infobits[7] & 1);
 338                 info.notfound = !!(infobits[8] & 0x10);
 339                 info.pblf = !!(infobits[9] & 0x20);
 340                 info.hamming = 0;
 341                 for (a = 0; a <= 7; a++) {
 342                         if (infobits[a] & 0xf0) {
 343                                 info.hamming = 1;
 344                                 break;
 345                         }
 346                 }
 347                 if (t->vdau[req->pgbuf].clrfound)
 348                         info.notfound = 1;
 349                 if (copy_to_user(req->buffer, &info, sizeof(vtx_pageinfo_t)))
 350                         return -EFAULT;
 351                 if (!info.hamming && !info.notfound)
 352                         t->is_searching[req->pgbuf] = false;
 353                 return 0;
 354         }
 355
 356         case VTXIOCGETPAGE:
 357         {
 358                 vtx_pagereq_t *req = arg;
 359                 int start, end;
 360
 361                 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS || req->start < 0 ||
 362                         req->start > req->end || req->end >= (virtual_mode ? VTX_VIRTUALSIZE : VTX_PAGESIZE))
 363                         return -EINVAL;
 364                 if (copy_to_user(req->buffer, &t->vdau[req->pgbuf].pgbuf[req->start], req->end - req->start + 1))
 365                         return -EFAULT;
 366
 367                  /*
 368                   *     Always read the time directly from SAA5249
 369                   */
 370
 371                 if (req->start <= 39 && req->end >= 32) {
 372                         int len;
 373                         char buf[16];
 374                         start = max(req->start, 32);
 375                         end = min(req->end, 39);
 376                         len = end - start + 1;
 377                         if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 378                                 i2c_getdata(t, len, buf))
 379                                 return -EIO;
 380                         if (copy_to_user(req->buffer + start - req->start, buf, len))
 381                                 return -EFAULT;
 382                 }
 383                 /* Insert the current header if DAU is still searching for a page */
 384                 if (req->start <= 31 && req->end >= 7 && t->is_searching[req->pgbuf]) {
 385                         char buf[32];
 386                         int len;
 387
 388                         start = max(req->start, 7);
 389                         end = min(req->end, 31);
 390                         len = end - start + 1;
 391                         if (i2c_senddata(t, 8, 0, 0, start, -1) ||
 392                                 i2c_getdata(t, len, buf))
 393                                 return -EIO;
 394                         if (copy_to_user(req->buffer + start - req->start, buf, len))
 395                                 return -EFAULT;
 396                 }
 397                 return 0;
 398         }
 399
 400         case VTXIOCSTOPDAU:
 401         {
 402                 vtx_pagereq_t *req = arg;
 403
 404                 if (req->pgbuf < 0 || req->pgbuf >= NUM_DAUS)
 405                         return -EINVAL;
 406                 t->vdau[req->pgbuf].stopped = true;
 407                 t->is_searching[req->pgbuf] = false;
 408                 return 0;
 409         }
 410
 411         case VTXIOCPUTPAGE:
 412         case VTXIOCSETDISP:
 413         case VTXIOCPUTSTAT:
 414                 return 0;
 415
 416         case VTXIOCCLRCACHE:
 417         {
 418                 if (i2c_senddata(t, 0, NUM_DAUS, 0, 8, -1) || i2c_senddata(t, 11,
 419                         ' ', ' ', ' ', ' ', ' ', ' ',
 420                         ' ', ' ', ' ', ' ', ' ', ' ',
 421                         ' ', ' ', ' ', ' ', ' ', ' ',
 422                         ' ', ' ', ' ', ' ', ' ', ' ',
 423                         -1))
 424                         return -EIO;
 425                 if (i2c_senddata(t, 3, 0x20, -1))
 426                         return -EIO;
 427                 jdelay(10 * CLEAR_DELAY);                       /* I have no idea how long we have to wait here */
 428                 return 0;
 429         }
 430
 431         case VTXIOCSETVIRT:
 432         {
 433                 /* The SAA5249 has virtual-row reception turned on always */
 434                 t->virtual_mode = (int)(long)arg;
 435                 return 0;
 436         }
 437         }
 438         return -EINVAL;
 439 }
 440
 441 /*
 442  * Translates old vtx IOCTLs to new ones
 443  *
 444  * This keeps new kernel versions compatible with old userspace programs.
 445  */
 446 static inline unsigned int vtx_fix_command(unsigned int cmd)
 447 {
 448         switch (cmd) {
 449         case VTXIOCGETINFO_OLD:
 450                 cmd = VTXIOCGETINFO;
 451                 break;
 452         case VTXIOCCLRPAGE_OLD:
 453                 cmd = VTXIOCCLRPAGE;
 454                 break;
 455         case VTXIOCCLRFOUND_OLD:
 456                 cmd = VTXIOCCLRFOUND;
 457                 break;
 458         case VTXIOCPAGEREQ_OLD:
 459                 cmd = VTXIOCPAGEREQ;
 460                 break;
 461         case VTXIOCGETSTAT_OLD:
 462                 cmd = VTXIOCGETSTAT;
 463                 break;
 464         case VTXIOCGETPAGE_OLD:
 465                 cmd = VTXIOCGETPAGE;
 466                 break;
 467         case VTXIOCSTOPDAU_OLD:
 468                 cmd = VTXIOCSTOPDAU;
 469                 break;
 470         case VTXIOCPUTPAGE_OLD:
 471                 cmd = VTXIOCPUTPAGE;
 472                 break;
 473         case VTXIOCSETDISP_OLD:
 474                 cmd = VTXIOCSETDISP;
 475                 break;
 476         case VTXIOCPUTSTAT_OLD:
 477                 cmd = VTXIOCPUTSTAT;
 478                 break;
 479         case VTXIOCCLRCACHE_OLD:
 480                 cmd = VTXIOCCLRCACHE;
 481                 break;
 482         case VTXIOCSETVIRT_OLD:
 483                 cmd = VTXIOCSETVIRT;
 484                 break;
 485         }
 486         return cmd;
 487 }
 488
 489 /*
 490  *      Handle the locking
 491  */
 492
 493 static long saa5249_ioctl(struct file *file,
 494                          unsigned int cmd, unsigned long arg)
 495 {
 496         struct saa5249_device *t = video_drvdata(file);
 497         long err;
 498
 499         cmd = vtx_fix_command(cmd);
 500         mutex_lock(&t->lock);
 501         err = video_usercopy(file, cmd, arg, do_saa5249_ioctl);
 502         mutex_unlock(&t->lock);
 503         return err;
 504 }
 505
 506 static int saa5249_open(struct file *file)
 507 {
 508         struct saa5249_device *t = video_drvdata(file);
 509         int pgbuf;
 510
 511         if (test_and_set_bit(0, &t->in_use))
 512                 return -EBUSY;
 513
 514         if (i2c_senddata(t, 0, 0, -1) || /* Select R11 */
 515                 /* Turn off parity checks (we do this ourselves) */
 516                 i2c_senddata(t, 1, disp_modes[t->disp_mode][0], 0, -1) ||
 517                 /* Display TV-picture, no virtual rows */
 518                 i2c_senddata(t, 4, NUM_DAUS, disp_modes[t->disp_mode][1], disp_modes[t->disp_mode][2], 7, -1))
 519                 /* Set display to page 4 */
 520         {
 521                 clear_bit(0, &t->in_use);
 522                 return -EIO;
 523         }
 524
 525         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) {
 526                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 527                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 528                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 529                 t->vdau[pgbuf].expire = 0;
 530                 t->vdau[pgbuf].clrfound = true;
 531                 t->vdau[pgbuf].stopped = true;
 532                 t->is_searching[pgbuf] = false;
 533         }
 534         t->virtual_mode = false;
 535         return 0;
 536 }
 537
 538
 539
 540 static int saa5249_release(struct file *file)
 541 {
 542         struct saa5249_device *t = video_drvdata(file);
 543
 544         i2c_senddata(t, 1, 0x20, -1);           /* Turn off CCT */
 545         i2c_senddata(t, 5, 3, 3, -1);           /* Turn off TV-display */
 546         clear_bit(0, &t->in_use);
 547         return 0;
 548 }
 549
 550 static const struct v4l2_file_operations saa_fops = {
 551         .owner          = THIS_MODULE,
 552         .open           = saa5249_open,
 553         .release        = saa5249_release,
 554         .ioctl          = saa5249_ioctl,
 555 };
 556
 557 static struct video_device saa_template =
 558 {
 559         .name           = "saa5249",
 560         .fops           = &saa_fops,
 561         .release        = video_device_release,
 562 };
 563
 564 static int saa5249_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 565 {
 566         struct i2c_client *client = v4l2_get_subdevdata(sd);
 567
 568         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_SAA5249, 0);
 569 }
 570
 571 static const struct v4l2_subdev_core_ops saa5249_core_ops = {
 572         .g_chip_ident = saa5249_g_chip_ident,
 573 };
 574
 575 static const struct v4l2_subdev_ops saa5249_ops = {
 576         .core = &saa5249_core_ops,
 577 };
 578
 579 static int saa5249_probe(struct i2c_client *client,
 580                         const struct i2c_device_id *id)
 581 {
 582         int pgbuf;
 583         int err;
 584         struct saa5249_device *t;
 585         struct v4l2_subdev *sd;
 586
 587         v4l_info(client, "chip found @ 0x%x (%s)\n",
 588                         client->addr << 1, client->adapter->name);
 589         v4l_info(client, "VideoText version %d.%d\n",
 590                         VTX_VER_MAJ, VTX_VER_MIN);
 591         t = kzalloc(sizeof(*t), GFP_KERNEL);
 592         if (t == NULL)
 593                 return -ENOMEM;
 594         sd = &t->sd;
 595         v4l2_i2c_subdev_init(sd, client, &saa5249_ops);
 596         mutex_init(&t->lock);
 597
 598         /* Now create a video4linux device */
 599         t->vdev = video_device_alloc();
 600         if (t->vdev == NULL) {
 601                 kfree(t);
 602                 kfree(client);
 603                 return -ENOMEM;
 604         }
 605         memcpy(t->vdev, &saa_template, sizeof(*t->vdev));
 606
 607         for (pgbuf = 0; pgbuf < NUM_DAUS; pgbuf++) {
 608                 memset(t->vdau[pgbuf].pgbuf, ' ', sizeof(t->vdau[0].pgbuf));
 609                 memset(t->vdau[pgbuf].sregs, 0, sizeof(t->vdau[0].sregs));
 610                 memset(t->vdau[pgbuf].laststat, 0, sizeof(t->vdau[0].laststat));
 611                 t->vdau[pgbuf].expire = 0;
 612                 t->vdau[pgbuf].clrfound = true;
 613                 t->vdau[pgbuf].stopped = true;
 614                 t->is_searching[pgbuf] = false;
 615         }
 616         video_set_drvdata(t->vdev, t);
 617
 618         /* Register it */
 619         err = video_register_device(t->vdev, VFL_TYPE_VTX, -1);
 620         if (err < 0) {
 621                 video_device_release(t->vdev);
 622                 kfree(t);
 623                 return err;
 624         }
 625         return 0;
 626 }
 627
 628 static int saa5249_remove(struct i2c_client *client)
 629 {
 630         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 631         struct saa5249_device *t = to_dev(sd);
 632
 633         video_unregister_device(t->vdev);
 634         v4l2_device_unregister_subdev(sd);
 635         kfree(t);
 636         return 0;
 637 }
 638
 639 static const struct i2c_device_id saa5249_id[] = {
 640         { "saa5249", 0 },
 641         { }
 642 };
 643 MODULE_DEVICE_TABLE(i2c, saa5249_id);
 644
 645 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 646         .name = "saa5249",
 647         .probe = saa5249_probe,
 648         .remove = saa5249_remove,
 649         .id_table = saa5249_id,
 650 };