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 <linux/module.h> 23 #include <media/i2c/ir-kbd-i2c.h> 24 #include "pvrusb2-i2c-core.h" 25 #include "pvrusb2-hdw-internal.h" 26 #include "pvrusb2-debug.h" 27 #include "pvrusb2-fx2-cmd.h" 28 #include "pvrusb2.h" 29 30 #define trace_i2c(...) pvr2_trace(PVR2_TRACE_I2C,__VA_ARGS__) 31 32 /* 33 34 This module attempts to implement a compliant I2C adapter for the pvrusb2 35 device. 36 37 */ 38 39 static unsigned int i2c_scan; 40 module_param(i2c_scan, int, S_IRUGO|S_IWUSR); 41 MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time"); 42 43 static int ir_mode[PVR_NUM] = { [0 ... PVR_NUM-1] = 1 }; 44 module_param_array(ir_mode, int, NULL, 0444); 45 MODULE_PARM_DESC(ir_mode,"specify: 0=disable IR reception, 1=normal IR"); 46 47 static int pvr2_disable_ir_video; 48 module_param_named(disable_autoload_ir_video, pvr2_disable_ir_video, 49 int, S_IRUGO|S_IWUSR); 50 MODULE_PARM_DESC(disable_autoload_ir_video, 51 "1=do not try to autoload ir_video IR receiver"); 52 53 static int pvr2_i2c_write(struct pvr2_hdw *hdw, /* Context */ 54 u8 i2c_addr, /* I2C address we're talking to */ 55 u8 *data, /* Data to write */ 56 u16 length) /* Size of data to write */ 57 { 58 /* Return value - default 0 means success */ 59 int ret; 60 61 62 if (!data) length = 0; 63 if (length > (sizeof(hdw->cmd_buffer) - 3)) { 64 pvr2_trace(PVR2_TRACE_ERROR_LEGS, 65 "Killing an I2C write to %u that is too large" 66 " (desired=%u limit=%u)", 67 i2c_addr, 68 length,(unsigned int)(sizeof(hdw->cmd_buffer) - 3)); 69 return -ENOTSUPP; 70 } 71 72 LOCK_TAKE(hdw->ctl_lock); 73 74 /* Clear the command buffer (likely to be paranoia) */ 75 memset(hdw->cmd_buffer, 0, sizeof(hdw->cmd_buffer)); 76 77 /* Set up command buffer for an I2C write */ 78 hdw->cmd_buffer[0] = FX2CMD_I2C_WRITE; /* write prefix */ 79 hdw->cmd_buffer[1] = i2c_addr; /* i2c addr of chip */ 80 hdw->cmd_buffer[2] = length; /* length of what follows */ 81 if (length) memcpy(hdw->cmd_buffer + 3, data, length); 82 83 /* Do the operation */ 84 ret = pvr2_send_request(hdw, 85 hdw->cmd_buffer, 86 length + 3, 87 hdw->cmd_buffer, 88 1); 89 if (!ret) { 90 if (hdw->cmd_buffer[0] != 8) { 91 ret = -EIO; 92 if (hdw->cmd_buffer[0] != 7) { 93 trace_i2c("unexpected status" 94 " from i2_write[%d]: %d", 95 i2c_addr,hdw->cmd_buffer[0]); 96 } 97 } 98 } 99 100 LOCK_GIVE(hdw->ctl_lock); 101 102 return ret; 103 } 104 105 static int pvr2_i2c_read(struct pvr2_hdw *hdw, /* Context */ 106 u8 i2c_addr, /* I2C address we're talking to */ 107 u8 *data, /* Data to write */ 108 u16 dlen, /* Size of data to write */ 109 u8 *res, /* Where to put data we read */ 110 u16 rlen) /* Amount of data to read */ 111 { 112 /* Return value - default 0 means success */ 113 int ret; 114 115 116 if (!data) dlen = 0; 117 if (dlen > (sizeof(hdw->cmd_buffer) - 4)) { 118 pvr2_trace(PVR2_TRACE_ERROR_LEGS, 119 "Killing an I2C read to %u that has wlen too large" 120 " (desired=%u limit=%u)", 121 i2c_addr, 122 dlen,(unsigned int)(sizeof(hdw->cmd_buffer) - 4)); 123 return -ENOTSUPP; 124 } 125 if (res && (rlen > (sizeof(hdw->cmd_buffer) - 1))) { 126 pvr2_trace(PVR2_TRACE_ERROR_LEGS, 127 "Killing an I2C read to %u that has rlen too large" 128 " (desired=%u limit=%u)", 129 i2c_addr, 130 rlen,(unsigned int)(sizeof(hdw->cmd_buffer) - 1)); 131 return -ENOTSUPP; 132 } 133 134 LOCK_TAKE(hdw->ctl_lock); 135 136 /* Clear the command buffer (likely to be paranoia) */ 137 memset(hdw->cmd_buffer, 0, sizeof(hdw->cmd_buffer)); 138 139 /* Set up command buffer for an I2C write followed by a read */ 140 hdw->cmd_buffer[0] = FX2CMD_I2C_READ; /* read prefix */ 141 hdw->cmd_buffer[1] = dlen; /* arg length */ 142 hdw->cmd_buffer[2] = rlen; /* answer length. Device will send one 143 more byte (status). */ 144 hdw->cmd_buffer[3] = i2c_addr; /* i2c addr of chip */ 145 if (dlen) memcpy(hdw->cmd_buffer + 4, data, dlen); 146 147 /* Do the operation */ 148 ret = pvr2_send_request(hdw, 149 hdw->cmd_buffer, 150 4 + dlen, 151 hdw->cmd_buffer, 152 rlen + 1); 153 if (!ret) { 154 if (hdw->cmd_buffer[0] != 8) { 155 ret = -EIO; 156 if (hdw->cmd_buffer[0] != 7) { 157 trace_i2c("unexpected status" 158 " from i2_read[%d]: %d", 159 i2c_addr,hdw->cmd_buffer[0]); 160 } 161 } 162 } 163 164 /* Copy back the result */ 165 if (res && rlen) { 166 if (ret) { 167 /* Error, just blank out the return buffer */ 168 memset(res, 0, rlen); 169 } else { 170 memcpy(res, hdw->cmd_buffer + 1, rlen); 171 } 172 } 173 174 LOCK_GIVE(hdw->ctl_lock); 175 176 return ret; 177 } 178 179 /* This is the common low level entry point for doing I2C operations to the 180 hardware. */ 181 static int pvr2_i2c_basic_op(struct pvr2_hdw *hdw, 182 u8 i2c_addr, 183 u8 *wdata, 184 u16 wlen, 185 u8 *rdata, 186 u16 rlen) 187 { 188 if (!rdata) rlen = 0; 189 if (!wdata) wlen = 0; 190 if (rlen || !wlen) { 191 return pvr2_i2c_read(hdw,i2c_addr,wdata,wlen,rdata,rlen); 192 } else { 193 return pvr2_i2c_write(hdw,i2c_addr,wdata,wlen); 194 } 195 } 196 197 198 /* This is a special entry point for cases of I2C transaction attempts to 199 the IR receiver. The implementation here simulates the IR receiver by 200 issuing a command to the FX2 firmware and using that response to return 201 what the real I2C receiver would have returned. We use this for 24xxx 202 devices, where the IR receiver chip has been removed and replaced with 203 FX2 related logic. */ 204 static int i2c_24xxx_ir(struct pvr2_hdw *hdw, 205 u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen) 206 { 207 u8 dat[4]; 208 unsigned int stat; 209 210 if (!(rlen || wlen)) { 211 /* This is a probe attempt. Just let it succeed. */ 212 return 0; 213 } 214 215 /* We don't understand this kind of transaction */ 216 if ((wlen != 0) || (rlen == 0)) return -EIO; 217 218 if (rlen < 3) { 219 /* Mike Isely <isely@pobox.com> Appears to be a probe 220 attempt from lirc. Just fill in zeroes and return. If 221 we try instead to do the full transaction here, then bad 222 things seem to happen within the lirc driver module 223 (version 0.8.0-7 sources from Debian, when run under 224 vanilla 2.6.17.6 kernel) - and I don't have the patience 225 to chase it down. */ 226 if (rlen > 0) rdata[0] = 0; 227 if (rlen > 1) rdata[1] = 0; 228 return 0; 229 } 230 231 /* Issue a command to the FX2 to read the IR receiver. */ 232 LOCK_TAKE(hdw->ctl_lock); do { 233 hdw->cmd_buffer[0] = FX2CMD_GET_IR_CODE; 234 stat = pvr2_send_request(hdw, 235 hdw->cmd_buffer,1, 236 hdw->cmd_buffer,4); 237 dat[0] = hdw->cmd_buffer[0]; 238 dat[1] = hdw->cmd_buffer[1]; 239 dat[2] = hdw->cmd_buffer[2]; 240 dat[3] = hdw->cmd_buffer[3]; 241 } while (0); LOCK_GIVE(hdw->ctl_lock); 242 243 /* Give up if that operation failed. */ 244 if (stat != 0) return stat; 245 246 /* Mangle the results into something that looks like the real IR 247 receiver. */ 248 rdata[2] = 0xc1; 249 if (dat[0] != 1) { 250 /* No code received. */ 251 rdata[0] = 0; 252 rdata[1] = 0; 253 } else { 254 u16 val; 255 /* Mash the FX2 firmware-provided IR code into something 256 that the normal i2c chip-level driver expects. */ 257 val = dat[1]; 258 val <<= 8; 259 val |= dat[2]; 260 val >>= 1; 261 val &= ~0x0003; 262 val |= 0x8000; 263 rdata[0] = (val >> 8) & 0xffu; 264 rdata[1] = val & 0xffu; 265 } 266 267 return 0; 268 } 269 270 /* This is a special entry point that is entered if an I2C operation is 271 attempted to a wm8775 chip on model 24xxx hardware. Autodetect of this 272 part doesn't work, but we know it is really there. So let's look for 273 the autodetect attempt and just return success if we see that. */ 274 static int i2c_hack_wm8775(struct pvr2_hdw *hdw, 275 u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen) 276 { 277 if (!(rlen || wlen)) { 278 // This is a probe attempt. Just let it succeed. 279 return 0; 280 } 281 return pvr2_i2c_basic_op(hdw,i2c_addr,wdata,wlen,rdata,rlen); 282 } 283 284 /* This is an entry point designed to always fail any attempt to perform a 285 transfer. We use this to cause certain I2C addresses to not be 286 probed. */ 287 static int i2c_black_hole(struct pvr2_hdw *hdw, 288 u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen) 289 { 290 return -EIO; 291 } 292 293 /* This is a special entry point that is entered if an I2C operation is 294 attempted to a cx25840 chip on model 24xxx hardware. This chip can 295 sometimes wedge itself. Worse still, when this happens msp3400 can 296 falsely detect this part and then the system gets hosed up after msp3400 297 gets confused and dies. What we want to do here is try to keep msp3400 298 away and also try to notice if the chip is wedged and send a warning to 299 the system log. */ 300 static int i2c_hack_cx25840(struct pvr2_hdw *hdw, 301 u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen) 302 { 303 int ret; 304 unsigned int subaddr; 305 u8 wbuf[2]; 306 int state = hdw->i2c_cx25840_hack_state; 307 308 if (!(rlen || wlen)) { 309 // Probe attempt - always just succeed and don't bother the 310 // hardware (this helps to make the state machine further 311 // down somewhat easier). 312 return 0; 313 } 314 315 if (state == 3) { 316 return pvr2_i2c_basic_op(hdw,i2c_addr,wdata,wlen,rdata,rlen); 317 } 318 319 /* We're looking for the exact pattern where the revision register 320 is being read. The cx25840 module will always look at the 321 revision register first. Any other pattern of access therefore 322 has to be a probe attempt from somebody else so we'll reject it. 323 Normally we could just let each client just probe the part 324 anyway, but when the cx25840 is wedged, msp3400 will get a false 325 positive and that just screws things up... */ 326 327 if (wlen == 0) { 328 switch (state) { 329 case 1: subaddr = 0x0100; break; 330 case 2: subaddr = 0x0101; break; 331 default: goto fail; 332 } 333 } else if (wlen == 2) { 334 subaddr = (wdata[0] << 8) | wdata[1]; 335 switch (subaddr) { 336 case 0x0100: state = 1; break; 337 case 0x0101: state = 2; break; 338 default: goto fail; 339 } 340 } else { 341 goto fail; 342 } 343 if (!rlen) goto success; 344 state = 0; 345 if (rlen != 1) goto fail; 346 347 /* If we get to here then we have a legitimate read for one of the 348 two revision bytes, so pass it through. */ 349 wbuf[0] = subaddr >> 8; 350 wbuf[1] = subaddr; 351 ret = pvr2_i2c_basic_op(hdw,i2c_addr,wbuf,2,rdata,rlen); 352 353 if ((ret != 0) || (*rdata == 0x04) || (*rdata == 0x0a)) { 354 pvr2_trace(PVR2_TRACE_ERROR_LEGS, 355 "WARNING: Detected a wedged cx25840 chip;" 356 " the device will not work."); 357 pvr2_trace(PVR2_TRACE_ERROR_LEGS, 358 "WARNING: Try power cycling the pvrusb2 device."); 359 pvr2_trace(PVR2_TRACE_ERROR_LEGS, 360 "WARNING: Disabling further access to the device" 361 " to prevent other foul-ups."); 362 // This blocks all further communication with the part. 363 hdw->i2c_func[0x44] = NULL; 364 pvr2_hdw_render_useless(hdw); 365 goto fail; 366 } 367 368 /* Success! */ 369 pvr2_trace(PVR2_TRACE_CHIPS,"cx25840 appears to be OK."); 370 state = 3; 371 372 success: 373 hdw->i2c_cx25840_hack_state = state; 374 return 0; 375 376 fail: 377 hdw->i2c_cx25840_hack_state = state; 378 return -EIO; 379 } 380 381 /* This is a very, very limited I2C adapter implementation. We can only 382 support what we actually know will work on the device... */ 383 static int pvr2_i2c_xfer(struct i2c_adapter *i2c_adap, 384 struct i2c_msg msgs[], 385 int num) 386 { 387 int ret = -ENOTSUPP; 388 pvr2_i2c_func funcp = NULL; 389 struct pvr2_hdw *hdw = (struct pvr2_hdw *)(i2c_adap->algo_data); 390 391 if (!num) { 392 ret = -EINVAL; 393 goto done; 394 } 395 if (msgs[0].addr < PVR2_I2C_FUNC_CNT) { 396 funcp = hdw->i2c_func[msgs[0].addr]; 397 } 398 if (!funcp) { 399 ret = -EIO; 400 goto done; 401 } 402 403 if (num == 1) { 404 if (msgs[0].flags & I2C_M_RD) { 405 /* Simple read */ 406 u16 tcnt,bcnt,offs; 407 if (!msgs[0].len) { 408 /* Length == 0 read. This is a probe. */ 409 if (funcp(hdw,msgs[0].addr,NULL,0,NULL,0)) { 410 ret = -EIO; 411 goto done; 412 } 413 ret = 1; 414 goto done; 415 } 416 /* If the read is short enough we'll do the whole 417 thing atomically. Otherwise we have no choice 418 but to break apart the reads. */ 419 tcnt = msgs[0].len; 420 offs = 0; 421 while (tcnt) { 422 bcnt = tcnt; 423 if (bcnt > sizeof(hdw->cmd_buffer)-1) { 424 bcnt = sizeof(hdw->cmd_buffer)-1; 425 } 426 if (funcp(hdw,msgs[0].addr,NULL,0, 427 msgs[0].buf+offs,bcnt)) { 428 ret = -EIO; 429 goto done; 430 } 431 offs += bcnt; 432 tcnt -= bcnt; 433 } 434 ret = 1; 435 goto done; 436 } else { 437 /* Simple write */ 438 ret = 1; 439 if (funcp(hdw,msgs[0].addr, 440 msgs[0].buf,msgs[0].len,NULL,0)) { 441 ret = -EIO; 442 } 443 goto done; 444 } 445 } else if (num == 2) { 446 if (msgs[0].addr != msgs[1].addr) { 447 trace_i2c("i2c refusing 2 phase transfer with" 448 " conflicting target addresses"); 449 ret = -ENOTSUPP; 450 goto done; 451 } 452 if ((!((msgs[0].flags & I2C_M_RD))) && 453 (msgs[1].flags & I2C_M_RD)) { 454 u16 tcnt,bcnt,wcnt,offs; 455 /* Write followed by atomic read. If the read 456 portion is short enough we'll do the whole thing 457 atomically. Otherwise we have no choice but to 458 break apart the reads. */ 459 tcnt = msgs[1].len; 460 wcnt = msgs[0].len; 461 offs = 0; 462 while (tcnt || wcnt) { 463 bcnt = tcnt; 464 if (bcnt > sizeof(hdw->cmd_buffer)-1) { 465 bcnt = sizeof(hdw->cmd_buffer)-1; 466 } 467 if (funcp(hdw,msgs[0].addr, 468 msgs[0].buf,wcnt, 469 msgs[1].buf+offs,bcnt)) { 470 ret = -EIO; 471 goto done; 472 } 473 offs += bcnt; 474 tcnt -= bcnt; 475 wcnt = 0; 476 } 477 ret = 2; 478 goto done; 479 } else { 480 trace_i2c("i2c refusing complex transfer" 481 " read0=%d read1=%d", 482 (msgs[0].flags & I2C_M_RD), 483 (msgs[1].flags & I2C_M_RD)); 484 } 485 } else { 486 trace_i2c("i2c refusing %d phase transfer",num); 487 } 488 489 done: 490 if (pvrusb2_debug & PVR2_TRACE_I2C_TRAF) { 491 unsigned int idx,offs,cnt; 492 for (idx = 0; idx < num; idx++) { 493 cnt = msgs[idx].len; 494 printk(KERN_INFO 495 "pvrusb2 i2c xfer %u/%u:" 496 " addr=0x%x len=%d %s", 497 idx+1,num, 498 msgs[idx].addr, 499 cnt, 500 (msgs[idx].flags & I2C_M_RD ? 501 "read" : "write")); 502 if ((ret > 0) || !(msgs[idx].flags & I2C_M_RD)) { 503 if (cnt > 8) cnt = 8; 504 printk(" ["); 505 for (offs = 0; offs < (cnt>8?8:cnt); offs++) { 506 if (offs) printk(" "); 507 printk("%02x",msgs[idx].buf[offs]); 508 } 509 if (offs < cnt) printk(" ..."); 510 printk("]"); 511 } 512 if (idx+1 == num) { 513 printk(" result=%d",ret); 514 } 515 printk("\n"); 516 } 517 if (!num) { 518 printk(KERN_INFO 519 "pvrusb2 i2c xfer null transfer result=%d\n", 520 ret); 521 } 522 } 523 return ret; 524 } 525 526 static u32 pvr2_i2c_functionality(struct i2c_adapter *adap) 527 { 528 return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C; 529 } 530 531 static struct i2c_algorithm pvr2_i2c_algo_template = { 532 .master_xfer = pvr2_i2c_xfer, 533 .functionality = pvr2_i2c_functionality, 534 }; 535 536 static struct i2c_adapter pvr2_i2c_adap_template = { 537 .owner = THIS_MODULE, 538 .class = 0, 539 }; 540 541 542 /* Return true if device exists at given address */ 543 static int do_i2c_probe(struct pvr2_hdw *hdw, int addr) 544 { 545 struct i2c_msg msg[1]; 546 int rc; 547 msg[0].addr = 0; 548 msg[0].flags = I2C_M_RD; 549 msg[0].len = 0; 550 msg[0].buf = NULL; 551 msg[0].addr = addr; 552 rc = i2c_transfer(&hdw->i2c_adap, msg, ARRAY_SIZE(msg)); 553 return rc == 1; 554 } 555 556 static void do_i2c_scan(struct pvr2_hdw *hdw) 557 { 558 int i; 559 printk(KERN_INFO "%s: i2c scan beginning\n", hdw->name); 560 for (i = 0; i < 128; i++) { 561 if (do_i2c_probe(hdw, i)) { 562 printk(KERN_INFO "%s: i2c scan: found device @ 0x%x\n", 563 hdw->name, i); 564 } 565 } 566 printk(KERN_INFO "%s: i2c scan done.\n", hdw->name); 567 } 568 569 static void pvr2_i2c_register_ir(struct pvr2_hdw *hdw) 570 { 571 struct i2c_board_info info; 572 struct IR_i2c_init_data *init_data = &hdw->ir_init_data; 573 if (pvr2_disable_ir_video) { 574 pvr2_trace(PVR2_TRACE_INFO, 575 "Automatic binding of ir_video has been disabled."); 576 return; 577 } 578 memset(&info, 0, sizeof(struct i2c_board_info)); 579 switch (hdw->ir_scheme_active) { 580 case PVR2_IR_SCHEME_24XXX: /* FX2-controlled IR */ 581 case PVR2_IR_SCHEME_29XXX: /* Original 29xxx device */ 582 init_data->ir_codes = RC_MAP_HAUPPAUGE; 583 init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP; 584 init_data->type = RC_BIT_RC5; 585 init_data->name = hdw->hdw_desc->description; 586 init_data->polling_interval = 100; /* ms From ir-kbd-i2c */ 587 /* IR Receiver */ 588 info.addr = 0x18; 589 info.platform_data = init_data; 590 strlcpy(info.type, "ir_video", I2C_NAME_SIZE); 591 pvr2_trace(PVR2_TRACE_INFO, "Binding %s to i2c address 0x%02x.", 592 info.type, info.addr); 593 i2c_new_device(&hdw->i2c_adap, &info); 594 break; 595 case PVR2_IR_SCHEME_ZILOG: /* HVR-1950 style */ 596 case PVR2_IR_SCHEME_24XXX_MCE: /* 24xxx MCE device */ 597 init_data->ir_codes = RC_MAP_HAUPPAUGE; 598 init_data->internal_get_key_func = IR_KBD_GET_KEY_HAUP_XVR; 599 init_data->type = RC_BIT_RC5 | RC_BIT_RC6_MCE | 600 RC_BIT_RC6_6A_32; 601 init_data->name = hdw->hdw_desc->description; 602 /* IR Receiver */ 603 info.addr = 0x71; 604 info.platform_data = init_data; 605 strlcpy(info.type, "ir_rx_z8f0811_haup", I2C_NAME_SIZE); 606 pvr2_trace(PVR2_TRACE_INFO, "Binding %s to i2c address 0x%02x.", 607 info.type, info.addr); 608 i2c_new_device(&hdw->i2c_adap, &info); 609 /* IR Trasmitter */ 610 info.addr = 0x70; 611 info.platform_data = init_data; 612 strlcpy(info.type, "ir_tx_z8f0811_haup", I2C_NAME_SIZE); 613 pvr2_trace(PVR2_TRACE_INFO, "Binding %s to i2c address 0x%02x.", 614 info.type, info.addr); 615 i2c_new_device(&hdw->i2c_adap, &info); 616 break; 617 default: 618 /* The device either doesn't support I2C-based IR or we 619 don't know (yet) how to operate IR on the device. */ 620 break; 621 } 622 } 623 624 void pvr2_i2c_core_init(struct pvr2_hdw *hdw) 625 { 626 unsigned int idx; 627 628 /* The default action for all possible I2C addresses is just to do 629 the transfer normally. */ 630 for (idx = 0; idx < PVR2_I2C_FUNC_CNT; idx++) { 631 hdw->i2c_func[idx] = pvr2_i2c_basic_op; 632 } 633 634 /* However, deal with various special cases for 24xxx hardware. */ 635 if (ir_mode[hdw->unit_number] == 0) { 636 printk(KERN_INFO "%s: IR disabled\n",hdw->name); 637 hdw->i2c_func[0x18] = i2c_black_hole; 638 } else if (ir_mode[hdw->unit_number] == 1) { 639 if (hdw->ir_scheme_active == PVR2_IR_SCHEME_24XXX) { 640 /* Set up translation so that our IR looks like a 641 29xxx device */ 642 hdw->i2c_func[0x18] = i2c_24xxx_ir; 643 } 644 } 645 if (hdw->hdw_desc->flag_has_cx25840) { 646 hdw->i2c_func[0x44] = i2c_hack_cx25840; 647 } 648 if (hdw->hdw_desc->flag_has_wm8775) { 649 hdw->i2c_func[0x1b] = i2c_hack_wm8775; 650 } 651 652 // Configure the adapter and set up everything else related to it. 653 hdw->i2c_adap = pvr2_i2c_adap_template; 654 hdw->i2c_algo = pvr2_i2c_algo_template; 655 strlcpy(hdw->i2c_adap.name,hdw->name,sizeof(hdw->i2c_adap.name)); 656 hdw->i2c_adap.dev.parent = &hdw->usb_dev->dev; 657 hdw->i2c_adap.algo = &hdw->i2c_algo; 658 hdw->i2c_adap.algo_data = hdw; 659 hdw->i2c_linked = !0; 660 i2c_set_adapdata(&hdw->i2c_adap, &hdw->v4l2_dev); 661 i2c_add_adapter(&hdw->i2c_adap); 662 if (hdw->i2c_func[0x18] == i2c_24xxx_ir) { 663 /* Probe for a different type of IR receiver on this 664 device. This is really the only way to differentiate 665 older 24xxx devices from 24xxx variants that include an 666 IR blaster. If the IR blaster is present, the IR 667 receiver is part of that chip and thus we must disable 668 the emulated IR receiver. */ 669 if (do_i2c_probe(hdw, 0x71)) { 670 pvr2_trace(PVR2_TRACE_INFO, 671 "Device has newer IR hardware;" 672 " disabling unneeded virtual IR device"); 673 hdw->i2c_func[0x18] = NULL; 674 /* Remember that this is a different device... */ 675 hdw->ir_scheme_active = PVR2_IR_SCHEME_24XXX_MCE; 676 } 677 } 678 if (i2c_scan) do_i2c_scan(hdw); 679 680 pvr2_i2c_register_ir(hdw); 681 } 682 683 void pvr2_i2c_core_done(struct pvr2_hdw *hdw) 684 { 685 if (hdw->i2c_linked) { 686 i2c_del_adapter(&hdw->i2c_adap); 687 hdw->i2c_linked = 0; 688 } 689 } 690