drivers/media/video/pvrusb2/pvrusb2-i2c-core.c

   1 /*
   2  *
   3  *
   4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 #include <linux/i2c.h>
  22 #include "pvrusb2-i2c-core.h"
  23 #include "pvrusb2-hdw-internal.h"
  24 #include "pvrusb2-debug.h"
  25 #include "pvrusb2-fx2-cmd.h"
  26 #include "pvrusb2.h"
  27
  28 #define trace_i2c(...) pvr2_trace(PVR2_TRACE_I2C,__VA_ARGS__)
  29
  30 /*
  31
  32   This module attempts to implement a compliant I2C adapter for the pvrusb2
  33   device.
  34
  35 */
  36
  37 static unsigned int i2c_scan;
  38 module_param(i2c_scan, int, S_IRUGO|S_IWUSR);
  39 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
  40
  41 static int ir_mode[PVR_NUM] = { [0 ... PVR_NUM-1] = 1 };
  42 module_param_array(ir_mode, int, NULL, 0444);
  43 MODULE_PARM_DESC(ir_mode,"specify: 0=disable IR reception, 1=normal IR");
  44
  45 static int pvr2_i2c_write(struct pvr2_hdw *hdw, /* Context */
  46                           u8 i2c_addr,      /* I2C address we're talking to */
  47                           u8 *data,         /* Data to write */
  48                           u16 length)       /* Size of data to write */
  49 {
  50         /* Return value - default 0 means success */
  51         int ret;
  52
  53
  54         if (!data) length = 0;
  55         if (length > (sizeof(hdw->cmd_buffer) - 3)) {
  56                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
  57                            "Killing an I2C write to %u that is too large"
  58                            " (desired=%u limit=%u)",
  59                            i2c_addr,
  60                            length,(unsigned int)(sizeof(hdw->cmd_buffer) - 3));
  61                 return -ENOTSUPP;
  62         }
  63
  64         LOCK_TAKE(hdw->ctl_lock);
  65
  66         /* Clear the command buffer (likely to be paranoia) */
  67         memset(hdw->cmd_buffer, 0, sizeof(hdw->cmd_buffer));
  68
  69         /* Set up command buffer for an I2C write */
  70         hdw->cmd_buffer[0] = FX2CMD_I2C_WRITE;      /* write prefix */
  71         hdw->cmd_buffer[1] = i2c_addr;  /* i2c addr of chip */
  72         hdw->cmd_buffer[2] = length;    /* length of what follows */
  73         if (length) memcpy(hdw->cmd_buffer + 3, data, length);
  74
  75         /* Do the operation */
  76         ret = pvr2_send_request(hdw,
  77                                 hdw->cmd_buffer,
  78                                 length + 3,
  79                                 hdw->cmd_buffer,
  80                                 1);
  81         if (!ret) {
  82                 if (hdw->cmd_buffer[0] != 8) {
  83                         ret = -EIO;
  84                         if (hdw->cmd_buffer[0] != 7) {
  85                                 trace_i2c("unexpected status"
  86                                           " from i2_write[%d]: %d",
  87                                           i2c_addr,hdw->cmd_buffer[0]);
  88                         }
  89                 }
  90         }
  91
  92         LOCK_GIVE(hdw->ctl_lock);
  93
  94         return ret;
  95 }
  96
  97 static int pvr2_i2c_read(struct pvr2_hdw *hdw, /* Context */
  98                          u8 i2c_addr,       /* I2C address we're talking to */
  99                          u8 *data,          /* Data to write */
 100                          u16 dlen,          /* Size of data to write */
 101                          u8 *res,           /* Where to put data we read */
 102                          u16 rlen)          /* Amount of data to read */
 103 {
 104         /* Return value - default 0 means success */
 105         int ret;
 106
 107
 108         if (!data) dlen = 0;
 109         if (dlen > (sizeof(hdw->cmd_buffer) - 4)) {
 110                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 111                            "Killing an I2C read to %u that has wlen too large"
 112                            " (desired=%u limit=%u)",
 113                            i2c_addr,
 114                            dlen,(unsigned int)(sizeof(hdw->cmd_buffer) - 4));
 115                 return -ENOTSUPP;
 116         }
 117         if (res && (rlen > (sizeof(hdw->cmd_buffer) - 1))) {
 118                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 119                            "Killing an I2C read to %u that has rlen too large"
 120                            " (desired=%u limit=%u)",
 121                            i2c_addr,
 122                            rlen,(unsigned int)(sizeof(hdw->cmd_buffer) - 1));
 123                 return -ENOTSUPP;
 124         }
 125
 126         LOCK_TAKE(hdw->ctl_lock);
 127
 128         /* Clear the command buffer (likely to be paranoia) */
 129         memset(hdw->cmd_buffer, 0, sizeof(hdw->cmd_buffer));
 130
 131         /* Set up command buffer for an I2C write followed by a read */
 132         hdw->cmd_buffer[0] = FX2CMD_I2C_READ;  /* read prefix */
 133         hdw->cmd_buffer[1] = dlen;  /* arg length */
 134         hdw->cmd_buffer[2] = rlen;  /* answer length. Device will send one
 135                                        more byte (status). */
 136         hdw->cmd_buffer[3] = i2c_addr;  /* i2c addr of chip */
 137         if (dlen) memcpy(hdw->cmd_buffer + 4, data, dlen);
 138
 139         /* Do the operation */
 140         ret = pvr2_send_request(hdw,
 141                                 hdw->cmd_buffer,
 142                                 4 + dlen,
 143                                 hdw->cmd_buffer,
 144                                 rlen + 1);
 145         if (!ret) {
 146                 if (hdw->cmd_buffer[0] != 8) {
 147                         ret = -EIO;
 148                         if (hdw->cmd_buffer[0] != 7) {
 149                                 trace_i2c("unexpected status"
 150                                           " from i2_read[%d]: %d",
 151                                           i2c_addr,hdw->cmd_buffer[0]);
 152                         }
 153                 }
 154         }
 155
 156         /* Copy back the result */
 157         if (res && rlen) {
 158                 if (ret) {
 159                         /* Error, just blank out the return buffer */
 160                         memset(res, 0, rlen);
 161                 } else {
 162                         memcpy(res, hdw->cmd_buffer + 1, rlen);
 163                 }
 164         }
 165
 166         LOCK_GIVE(hdw->ctl_lock);
 167
 168         return ret;
 169 }
 170
 171 /* This is the common low level entry point for doing I2C operations to the
 172    hardware. */
 173 static int pvr2_i2c_basic_op(struct pvr2_hdw *hdw,
 174                              u8 i2c_addr,
 175                              u8 *wdata,
 176                              u16 wlen,
 177                              u8 *rdata,
 178                              u16 rlen)
 179 {
 180         if (!rdata) rlen = 0;
 181         if (!wdata) wlen = 0;
 182         if (rlen || !wlen) {
 183                 return pvr2_i2c_read(hdw,i2c_addr,wdata,wlen,rdata,rlen);
 184         } else {
 185                 return pvr2_i2c_write(hdw,i2c_addr,wdata,wlen);
 186         }
 187 }
 188
 189
 190 /* This is a special entry point for cases of I2C transaction attempts to
 191    the IR receiver.  The implementation here simulates the IR receiver by
 192    issuing a command to the FX2 firmware and using that response to return
 193    what the real I2C receiver would have returned.  We use this for 24xxx
 194    devices, where the IR receiver chip has been removed and replaced with
 195    FX2 related logic. */
 196 static int i2c_24xxx_ir(struct pvr2_hdw *hdw,
 197                         u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen)
 198 {
 199         u8 dat[4];
 200         unsigned int stat;
 201
 202         if (!(rlen || wlen)) {
 203                 /* This is a probe attempt.  Just let it succeed. */
 204                 return 0;
 205         }
 206
 207         /* We don't understand this kind of transaction */
 208         if ((wlen != 0) || (rlen == 0)) return -EIO;
 209
 210         if (rlen < 3) {
 211                 /* Mike Isely <isely@pobox.com> Appears to be a probe
 212                    attempt from lirc.  Just fill in zeroes and return.  If
 213                    we try instead to do the full transaction here, then bad
 214                    things seem to happen within the lirc driver module
 215                    (version 0.8.0-7 sources from Debian, when run under
 216                    vanilla 2.6.17.6 kernel) - and I don't have the patience
 217                    to chase it down. */
 218                 if (rlen > 0) rdata[0] = 0;
 219                 if (rlen > 1) rdata[1] = 0;
 220                 return 0;
 221         }
 222
 223         /* Issue a command to the FX2 to read the IR receiver. */
 224         LOCK_TAKE(hdw->ctl_lock); do {
 225                 hdw->cmd_buffer[0] = FX2CMD_GET_IR_CODE;
 226                 stat = pvr2_send_request(hdw,
 227                                          hdw->cmd_buffer,1,
 228                                          hdw->cmd_buffer,4);
 229                 dat[0] = hdw->cmd_buffer[0];
 230                 dat[1] = hdw->cmd_buffer[1];
 231                 dat[2] = hdw->cmd_buffer[2];
 232                 dat[3] = hdw->cmd_buffer[3];
 233         } while (0); LOCK_GIVE(hdw->ctl_lock);
 234
 235         /* Give up if that operation failed. */
 236         if (stat != 0) return stat;
 237
 238         /* Mangle the results into something that looks like the real IR
 239            receiver. */
 240         rdata[2] = 0xc1;
 241         if (dat[0] != 1) {
 242                 /* No code received. */
 243                 rdata[0] = 0;
 244                 rdata[1] = 0;
 245         } else {
 246                 u16 val;
 247                 /* Mash the FX2 firmware-provided IR code into something
 248                    that the normal i2c chip-level driver expects. */
 249                 val = dat[1];
 250                 val <<= 8;
 251                 val |= dat[2];
 252                 val >>= 1;
 253                 val &= ~0x0003;
 254                 val |= 0x8000;
 255                 rdata[0] = (val >> 8) & 0xffu;
 256                 rdata[1] = val & 0xffu;
 257         }
 258
 259         return 0;
 260 }
 261
 262 /* This is a special entry point that is entered if an I2C operation is
 263    attempted to a wm8775 chip on model 24xxx hardware.  Autodetect of this
 264    part doesn't work, but we know it is really there.  So let's look for
 265    the autodetect attempt and just return success if we see that. */
 266 static int i2c_hack_wm8775(struct pvr2_hdw *hdw,
 267                            u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen)
 268 {
 269         if (!(rlen || wlen)) {
 270                 // This is a probe attempt.  Just let it succeed.
 271                 return 0;
 272         }
 273         return pvr2_i2c_basic_op(hdw,i2c_addr,wdata,wlen,rdata,rlen);
 274 }
 275
 276 /* This is an entry point designed to always fail any attempt to perform a
 277    transfer.  We use this to cause certain I2C addresses to not be
 278    probed. */
 279 static int i2c_black_hole(struct pvr2_hdw *hdw,
 280                            u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen)
 281 {
 282         return -EIO;
 283 }
 284
 285 /* This is a special entry point that is entered if an I2C operation is
 286    attempted to a cx25840 chip on model 24xxx hardware.  This chip can
 287    sometimes wedge itself.  Worse still, when this happens msp3400 can
 288    falsely detect this part and then the system gets hosed up after msp3400
 289    gets confused and dies.  What we want to do here is try to keep msp3400
 290    away and also try to notice if the chip is wedged and send a warning to
 291    the system log. */
 292 static int i2c_hack_cx25840(struct pvr2_hdw *hdw,
 293                             u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen)
 294 {
 295         int ret;
 296         unsigned int subaddr;
 297         u8 wbuf[2];
 298         int state = hdw->i2c_cx25840_hack_state;
 299
 300         if (!(rlen || wlen)) {
 301                 // Probe attempt - always just succeed and don't bother the
 302                 // hardware (this helps to make the state machine further
 303                 // down somewhat easier).
 304                 return 0;
 305         }
 306
 307         if (state == 3) {
 308                 return pvr2_i2c_basic_op(hdw,i2c_addr,wdata,wlen,rdata,rlen);
 309         }
 310
 311         /* We're looking for the exact pattern where the revision register
 312            is being read.  The cx25840 module will always look at the
 313            revision register first.  Any other pattern of access therefore
 314            has to be a probe attempt from somebody else so we'll reject it.
 315            Normally we could just let each client just probe the part
 316            anyway, but when the cx25840 is wedged, msp3400 will get a false
 317            positive and that just screws things up... */
 318
 319         if (wlen == 0) {
 320                 switch (state) {
 321                 case 1: subaddr = 0x0100; break;
 322                 case 2: subaddr = 0x0101; break;
 323                 default: goto fail;
 324                 }
 325         } else if (wlen == 2) {
 326                 subaddr = (wdata[0] << 8) | wdata[1];
 327                 switch (subaddr) {
 328                 case 0x0100: state = 1; break;
 329                 case 0x0101: state = 2; break;
 330                 default: goto fail;
 331                 }
 332         } else {
 333                 goto fail;
 334         }
 335         if (!rlen) goto success;
 336         state = 0;
 337         if (rlen != 1) goto fail;
 338
 339         /* If we get to here then we have a legitimate read for one of the
 340            two revision bytes, so pass it through. */
 341         wbuf[0] = subaddr >> 8;
 342         wbuf[1] = subaddr;
 343         ret = pvr2_i2c_basic_op(hdw,i2c_addr,wbuf,2,rdata,rlen);
 344
 345         if ((ret != 0) || (*rdata == 0x04) || (*rdata == 0x0a)) {
 346                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 347                            "WARNING: Detected a wedged cx25840 chip;"
 348                            " the device will not work.");
 349                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 350                            "WARNING: Try power cycling the pvrusb2 device.");
 351                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 352                            "WARNING: Disabling further access to the device"
 353                            " to prevent other foul-ups.");
 354                 // This blocks all further communication with the part.
 355                 hdw->i2c_func[0x44] = NULL;
 356                 pvr2_hdw_render_useless(hdw);
 357                 goto fail;
 358         }
 359
 360         /* Success! */
 361         pvr2_trace(PVR2_TRACE_CHIPS,"cx25840 appears to be OK.");
 362         state = 3;
 363
 364  success:
 365         hdw->i2c_cx25840_hack_state = state;
 366         return 0;
 367
 368  fail:
 369         hdw->i2c_cx25840_hack_state = state;
 370         return -EIO;
 371 }
 372
 373 /* This is a very, very limited I2C adapter implementation.  We can only
 374    support what we actually know will work on the device... */
 375 static int pvr2_i2c_xfer(struct i2c_adapter *i2c_adap,
 376                          struct i2c_msg msgs[],
 377                          int num)
 378 {
 379         int ret = -ENOTSUPP;
 380         pvr2_i2c_func funcp = NULL;
 381         struct pvr2_hdw *hdw = (struct pvr2_hdw *)(i2c_adap->algo_data);
 382
 383         if (!num) {
 384                 ret = -EINVAL;
 385                 goto done;
 386         }
 387         if (msgs[0].addr < PVR2_I2C_FUNC_CNT) {
 388                 funcp = hdw->i2c_func[msgs[0].addr];
 389         }
 390         if (!funcp) {
 391                 ret = -EIO;
 392                 goto done;
 393         }
 394
 395         if (num == 1) {
 396                 if (msgs[0].flags & I2C_M_RD) {
 397                         /* Simple read */
 398                         u16 tcnt,bcnt,offs;
 399                         if (!msgs[0].len) {
 400                                 /* Length == 0 read.  This is a probe. */
 401                                 if (funcp(hdw,msgs[0].addr,NULL,0,NULL,0)) {
 402                                         ret = -EIO;
 403                                         goto done;
 404                                 }
 405                                 ret = 1;
 406                                 goto done;
 407                         }
 408                         /* If the read is short enough we'll do the whole
 409                            thing atomically.  Otherwise we have no choice
 410                            but to break apart the reads. */
 411                         tcnt = msgs[0].len;
 412                         offs = 0;
 413                         while (tcnt) {
 414                                 bcnt = tcnt;
 415                                 if (bcnt > sizeof(hdw->cmd_buffer)-1) {
 416                                         bcnt = sizeof(hdw->cmd_buffer)-1;
 417                                 }
 418                                 if (funcp(hdw,msgs[0].addr,NULL,0,
 419                                           msgs[0].buf+offs,bcnt)) {
 420                                         ret = -EIO;
 421                                         goto done;
 422                                 }
 423                                 offs += bcnt;
 424                                 tcnt -= bcnt;
 425                         }
 426                         ret = 1;
 427                         goto done;
 428                 } else {
 429                         /* Simple write */
 430                         ret = 1;
 431                         if (funcp(hdw,msgs[0].addr,
 432                                   msgs[0].buf,msgs[0].len,NULL,0)) {
 433                                 ret = -EIO;
 434                         }
 435                         goto done;
 436                 }
 437         } else if (num == 2) {
 438                 if (msgs[0].addr != msgs[1].addr) {
 439                         trace_i2c("i2c refusing 2 phase transfer with"
 440                                   " conflicting target addresses");
 441                         ret = -ENOTSUPP;
 442                         goto done;
 443                 }
 444                 if ((!((msgs[0].flags & I2C_M_RD))) &&
 445                     (msgs[1].flags & I2C_M_RD)) {
 446                         u16 tcnt,bcnt,wcnt,offs;
 447                         /* Write followed by atomic read.  If the read
 448                            portion is short enough we'll do the whole thing
 449                            atomically.  Otherwise we have no choice but to
 450                            break apart the reads. */
 451                         tcnt = msgs[1].len;
 452                         wcnt = msgs[0].len;
 453                         offs = 0;
 454                         while (tcnt || wcnt) {
 455                                 bcnt = tcnt;
 456                                 if (bcnt > sizeof(hdw->cmd_buffer)-1) {
 457                                         bcnt = sizeof(hdw->cmd_buffer)-1;
 458                                 }
 459                                 if (funcp(hdw,msgs[0].addr,
 460                                           msgs[0].buf,wcnt,
 461                                           msgs[1].buf+offs,bcnt)) {
 462                                         ret = -EIO;
 463                                         goto done;
 464                                 }
 465                                 offs += bcnt;
 466                                 tcnt -= bcnt;
 467                                 wcnt = 0;
 468                         }
 469                         ret = 2;
 470                         goto done;
 471                 } else {
 472                         trace_i2c("i2c refusing complex transfer"
 473                                   " read0=%d read1=%d",
 474                                   (msgs[0].flags & I2C_M_RD),
 475                                   (msgs[1].flags & I2C_M_RD));
 476                 }
 477         } else {
 478                 trace_i2c("i2c refusing %d phase transfer",num);
 479         }
 480
 481  done:
 482         if (pvrusb2_debug & PVR2_TRACE_I2C_TRAF) {
 483                 unsigned int idx,offs,cnt;
 484                 for (idx = 0; idx < num; idx++) {
 485                         cnt = msgs[idx].len;
 486                         printk(KERN_INFO
 487                                "pvrusb2 i2c xfer %u/%u:"
 488                                " addr=0x%x len=%d %s",
 489                                idx+1,num,
 490                                msgs[idx].addr,
 491                                cnt,
 492                                (msgs[idx].flags & I2C_M_RD ?
 493                                 "read" : "write"));
 494                         if ((ret > 0) || !(msgs[idx].flags & I2C_M_RD)) {
 495                                 if (cnt > 8) cnt = 8;
 496                                 printk(" [");
 497                                 for (offs = 0; offs < (cnt>8?8:cnt); offs++) {
 498                                         if (offs) printk(" ");
 499                                         printk("%02x",msgs[idx].buf[offs]);
 500                                 }
 501                                 if (offs < cnt) printk(" ...");
 502                                 printk("]");
 503                         }
 504                         if (idx+1 == num) {
 505                                 printk(" result=%d",ret);
 506                         }
 507                         printk("\n");
 508                 }
 509                 if (!num) {
 510                         printk(KERN_INFO
 511                                "pvrusb2 i2c xfer null transfer result=%d\n",
 512                                ret);
 513                 }
 514         }
 515         return ret;
 516 }
 517
 518 static u32 pvr2_i2c_functionality(struct i2c_adapter *adap)
 519 {
 520         return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
 521 }
 522
 523 static struct i2c_algorithm pvr2_i2c_algo_template = {
 524         .master_xfer   = pvr2_i2c_xfer,
 525         .functionality = pvr2_i2c_functionality,
 526 };
 527
 528 static struct i2c_adapter pvr2_i2c_adap_template = {
 529         .owner         = THIS_MODULE,
 530         .class         = 0,
 531         .id            = I2C_HW_B_BT848,
 532 };
 533
 534
 535 /* Return true if device exists at given address */
 536 static int do_i2c_probe(struct pvr2_hdw *hdw, int addr)
 537 {
 538         struct i2c_msg msg[1];
 539         int rc;
 540         msg[0].addr = 0;
 541         msg[0].flags = I2C_M_RD;
 542         msg[0].len = 0;
 543         msg[0].buf = NULL;
 544         msg[0].addr = addr;
 545         rc = i2c_transfer(&hdw->i2c_adap, msg, ARRAY_SIZE(msg));
 546         return rc == 1;
 547 }
 548
 549 static void do_i2c_scan(struct pvr2_hdw *hdw)
 550 {
 551         int i;
 552         printk(KERN_INFO "%s: i2c scan beginning\n", hdw->name);
 553         for (i = 0; i < 128; i++) {
 554                 if (do_i2c_probe(hdw, i)) {
 555                         printk(KERN_INFO "%s: i2c scan: found device @ 0x%x\n",
 556                                hdw->name, i);
 557                 }
 558         }
 559         printk(KERN_INFO "%s: i2c scan done.\n", hdw->name);
 560 }
 561
 562 void pvr2_i2c_core_init(struct pvr2_hdw *hdw)
 563 {
 564         unsigned int idx;
 565
 566         /* The default action for all possible I2C addresses is just to do
 567            the transfer normally. */
 568         for (idx = 0; idx < PVR2_I2C_FUNC_CNT; idx++) {
 569                 hdw->i2c_func[idx] = pvr2_i2c_basic_op;
 570         }
 571
 572         /* However, deal with various special cases for 24xxx hardware. */
 573         if (ir_mode[hdw->unit_number] == 0) {
 574                 printk(KERN_INFO "%s: IR disabled\n",hdw->name);
 575                 hdw->i2c_func[0x18] = i2c_black_hole;
 576         } else if (ir_mode[hdw->unit_number] == 1) {
 577                 if (hdw->hdw_desc->ir_scheme == PVR2_IR_SCHEME_24XXX) {
 578                         hdw->i2c_func[0x18] = i2c_24xxx_ir;
 579                 }
 580         }
 581         if (hdw->hdw_desc->flag_has_cx25840) {
 582                 hdw->i2c_func[0x44] = i2c_hack_cx25840;
 583         }
 584         if (hdw->hdw_desc->flag_has_wm8775) {
 585                 hdw->i2c_func[0x1b] = i2c_hack_wm8775;
 586         }
 587
 588         // Configure the adapter and set up everything else related to it.
 589         memcpy(&hdw->i2c_adap,&pvr2_i2c_adap_template,sizeof(hdw->i2c_adap));
 590         memcpy(&hdw->i2c_algo,&pvr2_i2c_algo_template,sizeof(hdw->i2c_algo));
 591         strlcpy(hdw->i2c_adap.name,hdw->name,sizeof(hdw->i2c_adap.name));
 592         hdw->i2c_adap.dev.parent = &hdw->usb_dev->dev;
 593         hdw->i2c_adap.algo = &hdw->i2c_algo;
 594         hdw->i2c_adap.algo_data = hdw;
 595         hdw->i2c_linked = !0;
 596         i2c_set_adapdata(&hdw->i2c_adap, &hdw->v4l2_dev);
 597         i2c_add_adapter(&hdw->i2c_adap);
 598         if (hdw->i2c_func[0x18] == i2c_24xxx_ir) {
 599                 /* Probe for a different type of IR receiver on this
 600                    device.  If present, disable the emulated IR receiver. */
 601                 if (do_i2c_probe(hdw, 0x71)) {
 602                         pvr2_trace(PVR2_TRACE_INFO,
 603                                    "Device has newer IR hardware;"
 604                                    " disabling unneeded virtual IR device");
 605                         hdw->i2c_func[0x18] = NULL;
 606                 }
 607         }
 608         if (i2c_scan) do_i2c_scan(hdw);
 609 }
 610
 611 void pvr2_i2c_core_done(struct pvr2_hdw *hdw)
 612 {
 613         if (hdw->i2c_linked) {
 614                 i2c_del_adapter(&hdw->i2c_adap);
 615                 hdw->i2c_linked = 0;
 616         }
 617 }
 618
 619 /*
 620   Stuff for Emacs to see, in order to encourage consistent editing style:
 621   *** Local Variables: ***
 622   *** mode: c ***
 623   *** fill-column: 75 ***
 624   *** tab-width: 8 ***
 625   *** c-basic-offset: 8 ***
 626   *** End: ***
 627   */