1 /* 2 * drivers/media/radio/si470x/radio-si470x-common.c 3 * 4 * Driver for radios with Silicon Labs Si470x FM Radio Receivers 5 * 6 * Copyright (c) 2009 Tobias Lorenz <tobias.lorenz@gmx.net> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 24 /* 25 * History: 26 * 2008-01-12 Tobias Lorenz <tobias.lorenz@gmx.net> 27 * Version 1.0.0 28 * - First working version 29 * 2008-01-13 Tobias Lorenz <tobias.lorenz@gmx.net> 30 * Version 1.0.1 31 * - Improved error handling, every function now returns errno 32 * - Improved multi user access (start/mute/stop) 33 * - Channel doesn't get lost anymore after start/mute/stop 34 * - RDS support added (polling mode via interrupt EP 1) 35 * - marked default module parameters with *value* 36 * - switched from bit structs to bit masks 37 * - header file cleaned and integrated 38 * 2008-01-14 Tobias Lorenz <tobias.lorenz@gmx.net> 39 * Version 1.0.2 40 * - hex values are now lower case 41 * - commented USB ID for ADS/Tech moved on todo list 42 * - blacklisted si470x in hid-quirks.c 43 * - rds buffer handling functions integrated into *_work, *_read 44 * - rds_command in si470x_poll exchanged against simple retval 45 * - check for firmware version 15 46 * - code order and prototypes still remain the same 47 * - spacing and bottom of band codes remain the same 48 * 2008-01-16 Tobias Lorenz <tobias.lorenz@gmx.net> 49 * Version 1.0.3 50 * - code reordered to avoid function prototypes 51 * - switch/case defaults are now more user-friendly 52 * - unified comment style 53 * - applied all checkpatch.pl v1.12 suggestions 54 * except the warning about the too long lines with bit comments 55 * - renamed FMRADIO to RADIO to cut line length (checkpatch.pl) 56 * 2008-01-22 Tobias Lorenz <tobias.lorenz@gmx.net> 57 * Version 1.0.4 58 * - avoid poss. locking when doing copy_to_user which may sleep 59 * - RDS is automatically activated on read now 60 * - code cleaned of unnecessary rds_commands 61 * - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified 62 * (thanks to Guillaume RAMOUSSE) 63 * 2008-01-27 Tobias Lorenz <tobias.lorenz@gmx.net> 64 * Version 1.0.5 65 * - number of seek_retries changed to tune_timeout 66 * - fixed problem with incomplete tune operations by own buffers 67 * - optimization of variables and printf types 68 * - improved error logging 69 * 2008-01-31 Tobias Lorenz <tobias.lorenz@gmx.net> 70 * Oliver Neukum <oliver@neukum.org> 71 * Version 1.0.6 72 * - fixed coverity checker warnings in *_usb_driver_disconnect 73 * - probe()/open() race by correct ordering in probe() 74 * - DMA coherency rules by separate allocation of all buffers 75 * - use of endianness macros 76 * - abuse of spinlock, replaced by mutex 77 * - racy handling of timer in disconnect, 78 * replaced by delayed_work 79 * - racy interruptible_sleep_on(), 80 * replaced with wait_event_interruptible() 81 * - handle signals in read() 82 * 2008-02-08 Tobias Lorenz <tobias.lorenz@gmx.net> 83 * Oliver Neukum <oliver@neukum.org> 84 * Version 1.0.7 85 * - usb autosuspend support 86 * - unplugging fixed 87 * 2008-05-07 Tobias Lorenz <tobias.lorenz@gmx.net> 88 * Version 1.0.8 89 * - hardware frequency seek support 90 * - afc indication 91 * - more safety checks, let si470x_get_freq return errno 92 * - vidioc behavior corrected according to v4l2 spec 93 * 2008-10-20 Alexey Klimov <klimov.linux@gmail.com> 94 * - add support for KWorld USB FM Radio FM700 95 * - blacklisted KWorld radio in hid-core.c and hid-ids.h 96 * 2008-12-03 Mark Lord <mlord@pobox.com> 97 * - add support for DealExtreme USB Radio 98 * 2009-01-31 Bob Ross <pigiron@gmx.com> 99 * - correction of stereo detection/setting 100 * - correction of signal strength indicator scaling 101 * 2009-01-31 Rick Bronson <rick@efn.org> 102 * Tobias Lorenz <tobias.lorenz@gmx.net> 103 * - add LED status output 104 * - get HW/SW version from scratchpad 105 * 2009-06-16 Edouard Lafargue <edouard@lafargue.name> 106 * Version 1.0.10 107 * - add support for interrupt mode for RDS endpoint, 108 * instead of polling. 109 * Improves RDS reception significantly 110 */ 111 112 113 /* kernel includes */ 114 #include "radio-si470x.h" 115 116 117 118 /************************************************************************** 119 * Module Parameters 120 **************************************************************************/ 121 122 /* Spacing (kHz) */ 123 /* 0: 200 kHz (USA, Australia) */ 124 /* 1: 100 kHz (Europe, Japan) */ 125 /* 2: 50 kHz */ 126 static unsigned short space = 2; 127 module_param(space, ushort, 0444); 128 MODULE_PARM_DESC(space, "Spacing: 0=200kHz 1=100kHz *2=50kHz*"); 129 130 /* Bottom of Band (MHz) */ 131 /* 0: 87.5 - 108 MHz (USA, Europe)*/ 132 /* 1: 76 - 108 MHz (Japan wide band) */ 133 /* 2: 76 - 90 MHz (Japan) */ 134 static unsigned short band = 1; 135 module_param(band, ushort, 0444); 136 MODULE_PARM_DESC(band, "Band: 0=87.5..108MHz *1=76..108MHz* 2=76..90MHz"); 137 138 /* De-emphasis */ 139 /* 0: 75 us (USA) */ 140 /* 1: 50 us (Europe, Australia, Japan) */ 141 static unsigned short de = 1; 142 module_param(de, ushort, 0444); 143 MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*"); 144 145 /* Tune timeout */ 146 static unsigned int tune_timeout = 3000; 147 module_param(tune_timeout, uint, 0644); 148 MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*"); 149 150 /* Seek timeout */ 151 static unsigned int seek_timeout = 5000; 152 module_param(seek_timeout, uint, 0644); 153 MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*"); 154 155 156 157 /************************************************************************** 158 * Generic Functions 159 **************************************************************************/ 160 161 /* 162 * si470x_set_chan - set the channel 163 */ 164 static int si470x_set_chan(struct si470x_device *radio, unsigned short chan) 165 { 166 int retval; 167 unsigned long timeout; 168 bool timed_out = 0; 169 170 /* start tuning */ 171 radio->registers[CHANNEL] &= ~CHANNEL_CHAN; 172 radio->registers[CHANNEL] |= CHANNEL_TUNE | chan; 173 retval = si470x_set_register(radio, CHANNEL); 174 if (retval < 0) 175 goto done; 176 177 /* wait till tune operation has completed */ 178 timeout = jiffies + msecs_to_jiffies(tune_timeout); 179 do { 180 retval = si470x_get_register(radio, STATUSRSSI); 181 if (retval < 0) 182 goto stop; 183 timed_out = time_after(jiffies, timeout); 184 } while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) && 185 (!timed_out)); 186 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) 187 dev_warn(&radio->videodev->dev, "tune does not complete\n"); 188 if (timed_out) 189 dev_warn(&radio->videodev->dev, 190 "tune timed out after %u ms\n", tune_timeout); 191 192 stop: 193 /* stop tuning */ 194 radio->registers[CHANNEL] &= ~CHANNEL_TUNE; 195 retval = si470x_set_register(radio, CHANNEL); 196 197 done: 198 return retval; 199 } 200 201 202 /* 203 * si470x_get_freq - get the frequency 204 */ 205 static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq) 206 { 207 unsigned int spacing, band_bottom; 208 unsigned short chan; 209 int retval; 210 211 /* Spacing (kHz) */ 212 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) { 213 /* 0: 200 kHz (USA, Australia) */ 214 case 0: 215 spacing = 0.200 * FREQ_MUL; break; 216 /* 1: 100 kHz (Europe, Japan) */ 217 case 1: 218 spacing = 0.100 * FREQ_MUL; break; 219 /* 2: 50 kHz */ 220 default: 221 spacing = 0.050 * FREQ_MUL; break; 222 }; 223 224 /* Bottom of Band (MHz) */ 225 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) { 226 /* 0: 87.5 - 108 MHz (USA, Europe) */ 227 case 0: 228 band_bottom = 87.5 * FREQ_MUL; break; 229 /* 1: 76 - 108 MHz (Japan wide band) */ 230 default: 231 band_bottom = 76 * FREQ_MUL; break; 232 /* 2: 76 - 90 MHz (Japan) */ 233 case 2: 234 band_bottom = 76 * FREQ_MUL; break; 235 }; 236 237 /* read channel */ 238 retval = si470x_get_register(radio, READCHAN); 239 chan = radio->registers[READCHAN] & READCHAN_READCHAN; 240 241 /* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */ 242 *freq = chan * spacing + band_bottom; 243 244 return retval; 245 } 246 247 248 /* 249 * si470x_set_freq - set the frequency 250 */ 251 int si470x_set_freq(struct si470x_device *radio, unsigned int freq) 252 { 253 unsigned int spacing, band_bottom; 254 unsigned short chan; 255 256 /* Spacing (kHz) */ 257 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) { 258 /* 0: 200 kHz (USA, Australia) */ 259 case 0: 260 spacing = 0.200 * FREQ_MUL; break; 261 /* 1: 100 kHz (Europe, Japan) */ 262 case 1: 263 spacing = 0.100 * FREQ_MUL; break; 264 /* 2: 50 kHz */ 265 default: 266 spacing = 0.050 * FREQ_MUL; break; 267 }; 268 269 /* Bottom of Band (MHz) */ 270 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) { 271 /* 0: 87.5 - 108 MHz (USA, Europe) */ 272 case 0: 273 band_bottom = 87.5 * FREQ_MUL; break; 274 /* 1: 76 - 108 MHz (Japan wide band) */ 275 default: 276 band_bottom = 76 * FREQ_MUL; break; 277 /* 2: 76 - 90 MHz (Japan) */ 278 case 2: 279 band_bottom = 76 * FREQ_MUL; break; 280 }; 281 282 /* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */ 283 chan = (freq - band_bottom) / spacing; 284 285 return si470x_set_chan(radio, chan); 286 } 287 288 289 /* 290 * si470x_set_seek - set seek 291 */ 292 static int si470x_set_seek(struct si470x_device *radio, 293 unsigned int wrap_around, unsigned int seek_upward) 294 { 295 int retval = 0; 296 unsigned long timeout; 297 bool timed_out = 0; 298 299 /* start seeking */ 300 radio->registers[POWERCFG] |= POWERCFG_SEEK; 301 if (wrap_around == 1) 302 radio->registers[POWERCFG] &= ~POWERCFG_SKMODE; 303 else 304 radio->registers[POWERCFG] |= POWERCFG_SKMODE; 305 if (seek_upward == 1) 306 radio->registers[POWERCFG] |= POWERCFG_SEEKUP; 307 else 308 radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP; 309 retval = si470x_set_register(radio, POWERCFG); 310 if (retval < 0) 311 goto done; 312 313 /* wait till seek operation has completed */ 314 timeout = jiffies + msecs_to_jiffies(seek_timeout); 315 do { 316 retval = si470x_get_register(radio, STATUSRSSI); 317 if (retval < 0) 318 goto stop; 319 timed_out = time_after(jiffies, timeout); 320 } while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) && 321 (!timed_out)); 322 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) 323 dev_warn(&radio->videodev->dev, "seek does not complete\n"); 324 if (radio->registers[STATUSRSSI] & STATUSRSSI_SF) 325 dev_warn(&radio->videodev->dev, 326 "seek failed / band limit reached\n"); 327 if (timed_out) 328 dev_warn(&radio->videodev->dev, 329 "seek timed out after %u ms\n", seek_timeout); 330 331 stop: 332 /* stop seeking */ 333 radio->registers[POWERCFG] &= ~POWERCFG_SEEK; 334 retval = si470x_set_register(radio, POWERCFG); 335 336 done: 337 /* try again, if timed out */ 338 if ((retval == 0) && timed_out) 339 retval = -EAGAIN; 340 341 return retval; 342 } 343 344 345 /* 346 * si470x_start - switch on radio 347 */ 348 int si470x_start(struct si470x_device *radio) 349 { 350 int retval; 351 352 /* powercfg */ 353 radio->registers[POWERCFG] = 354 POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM; 355 retval = si470x_set_register(radio, POWERCFG); 356 if (retval < 0) 357 goto done; 358 359 /* sysconfig 1 */ 360 radio->registers[SYSCONFIG1] = SYSCONFIG1_DE; 361 retval = si470x_set_register(radio, SYSCONFIG1); 362 if (retval < 0) 363 goto done; 364 365 /* sysconfig 2 */ 366 radio->registers[SYSCONFIG2] = 367 (0x3f << 8) | /* SEEKTH */ 368 ((band << 6) & SYSCONFIG2_BAND) | /* BAND */ 369 ((space << 4) & SYSCONFIG2_SPACE) | /* SPACE */ 370 15; /* VOLUME (max) */ 371 retval = si470x_set_register(radio, SYSCONFIG2); 372 if (retval < 0) 373 goto done; 374 375 /* reset last channel */ 376 retval = si470x_set_chan(radio, 377 radio->registers[CHANNEL] & CHANNEL_CHAN); 378 379 done: 380 return retval; 381 } 382 383 384 /* 385 * si470x_stop - switch off radio 386 */ 387 int si470x_stop(struct si470x_device *radio) 388 { 389 int retval; 390 391 /* sysconfig 1 */ 392 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS; 393 retval = si470x_set_register(radio, SYSCONFIG1); 394 if (retval < 0) 395 goto done; 396 397 /* powercfg */ 398 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE; 399 /* POWERCFG_ENABLE has to automatically go low */ 400 radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE; 401 retval = si470x_set_register(radio, POWERCFG); 402 403 done: 404 return retval; 405 } 406 407 408 /* 409 * si470x_rds_on - switch on rds reception 410 */ 411 int si470x_rds_on(struct si470x_device *radio) 412 { 413 int retval; 414 415 /* sysconfig 1 */ 416 mutex_lock(&radio->lock); 417 radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS; 418 retval = si470x_set_register(radio, SYSCONFIG1); 419 if (retval < 0) 420 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS; 421 mutex_unlock(&radio->lock); 422 423 return retval; 424 } 425 426 427 428 /************************************************************************** 429 * File Operations Interface 430 **************************************************************************/ 431 432 /* 433 * si470x_fops_read - read RDS data 434 */ 435 static ssize_t si470x_fops_read(struct file *file, char __user *buf, 436 size_t count, loff_t *ppos) 437 { 438 struct si470x_device *radio = video_drvdata(file); 439 int retval = 0; 440 unsigned int block_count = 0; 441 442 /* switch on rds reception */ 443 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) 444 si470x_rds_on(radio); 445 446 /* block if no new data available */ 447 while (radio->wr_index == radio->rd_index) { 448 if (file->f_flags & O_NONBLOCK) { 449 retval = -EWOULDBLOCK; 450 goto done; 451 } 452 if (wait_event_interruptible(radio->read_queue, 453 radio->wr_index != radio->rd_index) < 0) { 454 retval = -EINTR; 455 goto done; 456 } 457 } 458 459 /* calculate block count from byte count */ 460 count /= 3; 461 462 /* copy RDS block out of internal buffer and to user buffer */ 463 mutex_lock(&radio->lock); 464 while (block_count < count) { 465 if (radio->rd_index == radio->wr_index) 466 break; 467 468 /* always transfer rds complete blocks */ 469 if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3)) 470 /* retval = -EFAULT; */ 471 break; 472 473 /* increment and wrap read pointer */ 474 radio->rd_index += 3; 475 if (radio->rd_index >= radio->buf_size) 476 radio->rd_index = 0; 477 478 /* increment counters */ 479 block_count++; 480 buf += 3; 481 retval += 3; 482 } 483 mutex_unlock(&radio->lock); 484 485 done: 486 return retval; 487 } 488 489 490 /* 491 * si470x_fops_poll - poll RDS data 492 */ 493 static unsigned int si470x_fops_poll(struct file *file, 494 struct poll_table_struct *pts) 495 { 496 struct si470x_device *radio = video_drvdata(file); 497 int retval = 0; 498 499 /* switch on rds reception */ 500 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) 501 si470x_rds_on(radio); 502 503 poll_wait(file, &radio->read_queue, pts); 504 505 if (radio->rd_index != radio->wr_index) 506 retval = POLLIN | POLLRDNORM; 507 508 return retval; 509 } 510 511 512 /* 513 * si470x_fops - file operations interface 514 */ 515 static const struct v4l2_file_operations si470x_fops = { 516 .owner = THIS_MODULE, 517 .read = si470x_fops_read, 518 .poll = si470x_fops_poll, 519 .ioctl = video_ioctl2, 520 .open = si470x_fops_open, 521 .release = si470x_fops_release, 522 }; 523 524 525 526 /************************************************************************** 527 * Video4Linux Interface 528 **************************************************************************/ 529 530 /* 531 * si470x_vidioc_queryctrl - enumerate control items 532 */ 533 static int si470x_vidioc_queryctrl(struct file *file, void *priv, 534 struct v4l2_queryctrl *qc) 535 { 536 struct si470x_device *radio = video_drvdata(file); 537 int retval = -EINVAL; 538 539 /* abort if qc->id is below V4L2_CID_BASE */ 540 if (qc->id < V4L2_CID_BASE) 541 goto done; 542 543 /* search video control */ 544 switch (qc->id) { 545 case V4L2_CID_AUDIO_VOLUME: 546 return v4l2_ctrl_query_fill(qc, 0, 15, 1, 15); 547 case V4L2_CID_AUDIO_MUTE: 548 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1); 549 } 550 551 /* disable unsupported base controls */ 552 /* to satisfy kradio and such apps */ 553 if ((retval == -EINVAL) && (qc->id < V4L2_CID_LASTP1)) { 554 qc->flags = V4L2_CTRL_FLAG_DISABLED; 555 retval = 0; 556 } 557 558 done: 559 if (retval < 0) 560 dev_warn(&radio->videodev->dev, 561 "query controls failed with %d\n", retval); 562 return retval; 563 } 564 565 566 /* 567 * si470x_vidioc_g_ctrl - get the value of a control 568 */ 569 static int si470x_vidioc_g_ctrl(struct file *file, void *priv, 570 struct v4l2_control *ctrl) 571 { 572 struct si470x_device *radio = video_drvdata(file); 573 int retval = 0; 574 575 /* safety checks */ 576 retval = si470x_disconnect_check(radio); 577 if (retval) 578 goto done; 579 580 switch (ctrl->id) { 581 case V4L2_CID_AUDIO_VOLUME: 582 ctrl->value = radio->registers[SYSCONFIG2] & 583 SYSCONFIG2_VOLUME; 584 break; 585 case V4L2_CID_AUDIO_MUTE: 586 ctrl->value = ((radio->registers[POWERCFG] & 587 POWERCFG_DMUTE) == 0) ? 1 : 0; 588 break; 589 default: 590 retval = -EINVAL; 591 } 592 593 done: 594 if (retval < 0) 595 dev_warn(&radio->videodev->dev, 596 "get control failed with %d\n", retval); 597 return retval; 598 } 599 600 601 /* 602 * si470x_vidioc_s_ctrl - set the value of a control 603 */ 604 static int si470x_vidioc_s_ctrl(struct file *file, void *priv, 605 struct v4l2_control *ctrl) 606 { 607 struct si470x_device *radio = video_drvdata(file); 608 int retval = 0; 609 610 /* safety checks */ 611 retval = si470x_disconnect_check(radio); 612 if (retval) 613 goto done; 614 615 switch (ctrl->id) { 616 case V4L2_CID_AUDIO_VOLUME: 617 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME; 618 radio->registers[SYSCONFIG2] |= ctrl->value; 619 retval = si470x_set_register(radio, SYSCONFIG2); 620 break; 621 case V4L2_CID_AUDIO_MUTE: 622 if (ctrl->value == 1) 623 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE; 624 else 625 radio->registers[POWERCFG] |= POWERCFG_DMUTE; 626 retval = si470x_set_register(radio, POWERCFG); 627 break; 628 default: 629 retval = -EINVAL; 630 } 631 632 done: 633 if (retval < 0) 634 dev_warn(&radio->videodev->dev, 635 "set control failed with %d\n", retval); 636 return retval; 637 } 638 639 640 /* 641 * si470x_vidioc_g_audio - get audio attributes 642 */ 643 static int si470x_vidioc_g_audio(struct file *file, void *priv, 644 struct v4l2_audio *audio) 645 { 646 /* driver constants */ 647 audio->index = 0; 648 strcpy(audio->name, "Radio"); 649 audio->capability = V4L2_AUDCAP_STEREO; 650 audio->mode = 0; 651 652 return 0; 653 } 654 655 656 /* 657 * si470x_vidioc_g_tuner - get tuner attributes 658 */ 659 static int si470x_vidioc_g_tuner(struct file *file, void *priv, 660 struct v4l2_tuner *tuner) 661 { 662 struct si470x_device *radio = video_drvdata(file); 663 int retval = 0; 664 665 /* safety checks */ 666 retval = si470x_disconnect_check(radio); 667 if (retval) 668 goto done; 669 670 if (tuner->index != 0) { 671 retval = -EINVAL; 672 goto done; 673 } 674 675 retval = si470x_get_register(radio, STATUSRSSI); 676 if (retval < 0) 677 goto done; 678 679 /* driver constants */ 680 strcpy(tuner->name, "FM"); 681 tuner->type = V4L2_TUNER_RADIO; 682 #if defined(CONFIG_USB_SI470X) || defined(CONFIG_USB_SI470X_MODULE) 683 tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | 684 V4L2_TUNER_CAP_RDS; 685 #else 686 tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO; 687 #endif 688 689 /* range limits */ 690 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) { 691 /* 0: 87.5 - 108 MHz (USA, Europe, default) */ 692 default: 693 tuner->rangelow = 87.5 * FREQ_MUL; 694 tuner->rangehigh = 108 * FREQ_MUL; 695 break; 696 /* 1: 76 - 108 MHz (Japan wide band) */ 697 case 1: 698 tuner->rangelow = 76 * FREQ_MUL; 699 tuner->rangehigh = 108 * FREQ_MUL; 700 break; 701 /* 2: 76 - 90 MHz (Japan) */ 702 case 2: 703 tuner->rangelow = 76 * FREQ_MUL; 704 tuner->rangehigh = 90 * FREQ_MUL; 705 break; 706 }; 707 708 /* stereo indicator == stereo (instead of mono) */ 709 if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0) 710 tuner->rxsubchans = V4L2_TUNER_SUB_MONO; 711 else 712 tuner->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO; 713 #if defined(CONFIG_USB_SI470X) || defined(CONFIG_USB_SI470X_MODULE) 714 /* If there is a reliable method of detecting an RDS channel, 715 then this code should check for that before setting this 716 RDS subchannel. */ 717 tuner->rxsubchans |= V4L2_TUNER_SUB_RDS; 718 #endif 719 720 /* mono/stereo selector */ 721 if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0) 722 tuner->audmode = V4L2_TUNER_MODE_STEREO; 723 else 724 tuner->audmode = V4L2_TUNER_MODE_MONO; 725 726 /* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */ 727 /* measured in units of db쨉V in 1 db increments (max at ~75 db쨉V) */ 728 tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI); 729 /* the ideal factor is 0xffff/75 = 873,8 */ 730 tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10); 731 732 /* automatic frequency control: -1: freq to low, 1 freq to high */ 733 /* AFCRL does only indicate that freq. differs, not if too low/high */ 734 tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0; 735 736 done: 737 if (retval < 0) 738 dev_warn(&radio->videodev->dev, 739 "get tuner failed with %d\n", retval); 740 return retval; 741 } 742 743 744 /* 745 * si470x_vidioc_s_tuner - set tuner attributes 746 */ 747 static int si470x_vidioc_s_tuner(struct file *file, void *priv, 748 struct v4l2_tuner *tuner) 749 { 750 struct si470x_device *radio = video_drvdata(file); 751 int retval = -EINVAL; 752 753 /* safety checks */ 754 retval = si470x_disconnect_check(radio); 755 if (retval) 756 goto done; 757 758 if (tuner->index != 0) 759 goto done; 760 761 /* mono/stereo selector */ 762 switch (tuner->audmode) { 763 case V4L2_TUNER_MODE_MONO: 764 radio->registers[POWERCFG] |= POWERCFG_MONO; /* force mono */ 765 break; 766 case V4L2_TUNER_MODE_STEREO: 767 radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */ 768 break; 769 default: 770 goto done; 771 } 772 773 retval = si470x_set_register(radio, POWERCFG); 774 775 done: 776 if (retval < 0) 777 dev_warn(&radio->videodev->dev, 778 "set tuner failed with %d\n", retval); 779 return retval; 780 } 781 782 783 /* 784 * si470x_vidioc_g_frequency - get tuner or modulator radio frequency 785 */ 786 static int si470x_vidioc_g_frequency(struct file *file, void *priv, 787 struct v4l2_frequency *freq) 788 { 789 struct si470x_device *radio = video_drvdata(file); 790 int retval = 0; 791 792 /* safety checks */ 793 retval = si470x_disconnect_check(radio); 794 if (retval) 795 goto done; 796 797 if (freq->tuner != 0) { 798 retval = -EINVAL; 799 goto done; 800 } 801 802 freq->type = V4L2_TUNER_RADIO; 803 retval = si470x_get_freq(radio, &freq->frequency); 804 805 done: 806 if (retval < 0) 807 dev_warn(&radio->videodev->dev, 808 "get frequency failed with %d\n", retval); 809 return retval; 810 } 811 812 813 /* 814 * si470x_vidioc_s_frequency - set tuner or modulator radio frequency 815 */ 816 static int si470x_vidioc_s_frequency(struct file *file, void *priv, 817 struct v4l2_frequency *freq) 818 { 819 struct si470x_device *radio = video_drvdata(file); 820 int retval = 0; 821 822 /* safety checks */ 823 retval = si470x_disconnect_check(radio); 824 if (retval) 825 goto done; 826 827 if (freq->tuner != 0) { 828 retval = -EINVAL; 829 goto done; 830 } 831 832 retval = si470x_set_freq(radio, freq->frequency); 833 834 done: 835 if (retval < 0) 836 dev_warn(&radio->videodev->dev, 837 "set frequency failed with %d\n", retval); 838 return retval; 839 } 840 841 842 /* 843 * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek 844 */ 845 static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv, 846 struct v4l2_hw_freq_seek *seek) 847 { 848 struct si470x_device *radio = video_drvdata(file); 849 int retval = 0; 850 851 /* safety checks */ 852 retval = si470x_disconnect_check(radio); 853 if (retval) 854 goto done; 855 856 if (seek->tuner != 0) { 857 retval = -EINVAL; 858 goto done; 859 } 860 861 retval = si470x_set_seek(radio, seek->wrap_around, seek->seek_upward); 862 863 done: 864 if (retval < 0) 865 dev_warn(&radio->videodev->dev, 866 "set hardware frequency seek failed with %d\n", retval); 867 return retval; 868 } 869 870 871 /* 872 * si470x_ioctl_ops - video device ioctl operations 873 */ 874 static const struct v4l2_ioctl_ops si470x_ioctl_ops = { 875 .vidioc_querycap = si470x_vidioc_querycap, 876 .vidioc_queryctrl = si470x_vidioc_queryctrl, 877 .vidioc_g_ctrl = si470x_vidioc_g_ctrl, 878 .vidioc_s_ctrl = si470x_vidioc_s_ctrl, 879 .vidioc_g_audio = si470x_vidioc_g_audio, 880 .vidioc_g_tuner = si470x_vidioc_g_tuner, 881 .vidioc_s_tuner = si470x_vidioc_s_tuner, 882 .vidioc_g_frequency = si470x_vidioc_g_frequency, 883 .vidioc_s_frequency = si470x_vidioc_s_frequency, 884 .vidioc_s_hw_freq_seek = si470x_vidioc_s_hw_freq_seek, 885 }; 886 887 888 /* 889 * si470x_viddev_template - video device interface 890 */ 891 struct video_device si470x_viddev_template = { 892 .fops = &si470x_fops, 893 .name = DRIVER_NAME, 894 .release = video_device_release, 895 .ioctl_ops = &si470x_ioctl_ops, 896 }; 897