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 * Copyright (c) 2012 Hans de Goede <hdegoede@redhat.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 */ 19 20 21 /* 22 * History: 23 * 2008-01-12 Tobias Lorenz <tobias.lorenz@gmx.net> 24 * Version 1.0.0 25 * - First working version 26 * 2008-01-13 Tobias Lorenz <tobias.lorenz@gmx.net> 27 * Version 1.0.1 28 * - Improved error handling, every function now returns errno 29 * - Improved multi user access (start/mute/stop) 30 * - Channel doesn't get lost anymore after start/mute/stop 31 * - RDS support added (polling mode via interrupt EP 1) 32 * - marked default module parameters with *value* 33 * - switched from bit structs to bit masks 34 * - header file cleaned and integrated 35 * 2008-01-14 Tobias Lorenz <tobias.lorenz@gmx.net> 36 * Version 1.0.2 37 * - hex values are now lower case 38 * - commented USB ID for ADS/Tech moved on todo list 39 * - blacklisted si470x in hid-quirks.c 40 * - rds buffer handling functions integrated into *_work, *_read 41 * - rds_command in si470x_poll exchanged against simple retval 42 * - check for firmware version 15 43 * - code order and prototypes still remain the same 44 * - spacing and bottom of band codes remain the same 45 * 2008-01-16 Tobias Lorenz <tobias.lorenz@gmx.net> 46 * Version 1.0.3 47 * - code reordered to avoid function prototypes 48 * - switch/case defaults are now more user-friendly 49 * - unified comment style 50 * - applied all checkpatch.pl v1.12 suggestions 51 * except the warning about the too long lines with bit comments 52 * - renamed FMRADIO to RADIO to cut line length (checkpatch.pl) 53 * 2008-01-22 Tobias Lorenz <tobias.lorenz@gmx.net> 54 * Version 1.0.4 55 * - avoid poss. locking when doing copy_to_user which may sleep 56 * - RDS is automatically activated on read now 57 * - code cleaned of unnecessary rds_commands 58 * - USB Vendor/Product ID for ADS/Tech FM Radio Receiver verified 59 * (thanks to Guillaume RAMOUSSE) 60 * 2008-01-27 Tobias Lorenz <tobias.lorenz@gmx.net> 61 * Version 1.0.5 62 * - number of seek_retries changed to tune_timeout 63 * - fixed problem with incomplete tune operations by own buffers 64 * - optimization of variables and printf types 65 * - improved error logging 66 * 2008-01-31 Tobias Lorenz <tobias.lorenz@gmx.net> 67 * Oliver Neukum <oliver@neukum.org> 68 * Version 1.0.6 69 * - fixed coverity checker warnings in *_usb_driver_disconnect 70 * - probe()/open() race by correct ordering in probe() 71 * - DMA coherency rules by separate allocation of all buffers 72 * - use of endianness macros 73 * - abuse of spinlock, replaced by mutex 74 * - racy handling of timer in disconnect, 75 * replaced by delayed_work 76 * - racy interruptible_sleep_on(), 77 * replaced with wait_event_interruptible() 78 * - handle signals in read() 79 * 2008-02-08 Tobias Lorenz <tobias.lorenz@gmx.net> 80 * Oliver Neukum <oliver@neukum.org> 81 * Version 1.0.7 82 * - usb autosuspend support 83 * - unplugging fixed 84 * 2008-05-07 Tobias Lorenz <tobias.lorenz@gmx.net> 85 * Version 1.0.8 86 * - hardware frequency seek support 87 * - afc indication 88 * - more safety checks, let si470x_get_freq return errno 89 * - vidioc behavior corrected according to v4l2 spec 90 * 2008-10-20 Alexey Klimov <klimov.linux@gmail.com> 91 * - add support for KWorld USB FM Radio FM700 92 * - blacklisted KWorld radio in hid-core.c and hid-ids.h 93 * 2008-12-03 Mark Lord <mlord@pobox.com> 94 * - add support for DealExtreme USB Radio 95 * 2009-01-31 Bob Ross <pigiron@gmx.com> 96 * - correction of stereo detection/setting 97 * - correction of signal strength indicator scaling 98 * 2009-01-31 Rick Bronson <rick@efn.org> 99 * Tobias Lorenz <tobias.lorenz@gmx.net> 100 * - add LED status output 101 * - get HW/SW version from scratchpad 102 * 2009-06-16 Edouard Lafargue <edouard@lafargue.name> 103 * Version 1.0.10 104 * - add support for interrupt mode for RDS endpoint, 105 * instead of polling. 106 * Improves RDS reception significantly 107 */ 108 109 110 /* kernel includes */ 111 #include "radio-si470x.h" 112 113 114 115 /************************************************************************** 116 * Module Parameters 117 **************************************************************************/ 118 119 /* Spacing (kHz) */ 120 /* 0: 200 kHz (USA, Australia) */ 121 /* 1: 100 kHz (Europe, Japan) */ 122 /* 2: 50 kHz */ 123 static unsigned short space = 2; 124 module_param(space, ushort, 0444); 125 MODULE_PARM_DESC(space, "Spacing: 0=200kHz 1=100kHz *2=50kHz*"); 126 127 /* De-emphasis */ 128 /* 0: 75 us (USA) */ 129 /* 1: 50 us (Europe, Australia, Japan) */ 130 static unsigned short de = 1; 131 module_param(de, ushort, 0444); 132 MODULE_PARM_DESC(de, "De-emphasis: 0=75us *1=50us*"); 133 134 /* Tune timeout */ 135 static unsigned int tune_timeout = 3000; 136 module_param(tune_timeout, uint, 0644); 137 MODULE_PARM_DESC(tune_timeout, "Tune timeout: *3000*"); 138 139 /* Seek timeout */ 140 static unsigned int seek_timeout = 5000; 141 module_param(seek_timeout, uint, 0644); 142 MODULE_PARM_DESC(seek_timeout, "Seek timeout: *5000*"); 143 144 static const struct v4l2_frequency_band bands[] = { 145 { 146 .type = V4L2_TUNER_RADIO, 147 .index = 0, 148 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | 149 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO | 150 V4L2_TUNER_CAP_FREQ_BANDS | 151 V4L2_TUNER_CAP_HWSEEK_BOUNDED | 152 V4L2_TUNER_CAP_HWSEEK_WRAP, 153 .rangelow = 87500 * 16, 154 .rangehigh = 108000 * 16, 155 .modulation = V4L2_BAND_MODULATION_FM, 156 }, 157 { 158 .type = V4L2_TUNER_RADIO, 159 .index = 1, 160 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | 161 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO | 162 V4L2_TUNER_CAP_FREQ_BANDS | 163 V4L2_TUNER_CAP_HWSEEK_BOUNDED | 164 V4L2_TUNER_CAP_HWSEEK_WRAP, 165 .rangelow = 76000 * 16, 166 .rangehigh = 108000 * 16, 167 .modulation = V4L2_BAND_MODULATION_FM, 168 }, 169 { 170 .type = V4L2_TUNER_RADIO, 171 .index = 2, 172 .capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | 173 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO | 174 V4L2_TUNER_CAP_FREQ_BANDS | 175 V4L2_TUNER_CAP_HWSEEK_BOUNDED | 176 V4L2_TUNER_CAP_HWSEEK_WRAP, 177 .rangelow = 76000 * 16, 178 .rangehigh = 90000 * 16, 179 .modulation = V4L2_BAND_MODULATION_FM, 180 }, 181 }; 182 183 /************************************************************************** 184 * Generic Functions 185 **************************************************************************/ 186 187 /* 188 * si470x_set_band - set the band 189 */ 190 static int si470x_set_band(struct si470x_device *radio, int band) 191 { 192 if (radio->band == band) 193 return 0; 194 195 radio->band = band; 196 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_BAND; 197 radio->registers[SYSCONFIG2] |= radio->band << 6; 198 return si470x_set_register(radio, SYSCONFIG2); 199 } 200 201 /* 202 * si470x_set_chan - set the channel 203 */ 204 static int si470x_set_chan(struct si470x_device *radio, unsigned short chan) 205 { 206 int retval; 207 unsigned long time_left; 208 bool timed_out = false; 209 210 /* start tuning */ 211 radio->registers[CHANNEL] &= ~CHANNEL_CHAN; 212 radio->registers[CHANNEL] |= CHANNEL_TUNE | chan; 213 retval = si470x_set_register(radio, CHANNEL); 214 if (retval < 0) 215 goto done; 216 217 /* wait till tune operation has completed */ 218 reinit_completion(&radio->completion); 219 time_left = wait_for_completion_timeout(&radio->completion, 220 msecs_to_jiffies(tune_timeout)); 221 if (time_left == 0) 222 timed_out = true; 223 224 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) 225 dev_warn(&radio->videodev.dev, "tune does not complete\n"); 226 if (timed_out) 227 dev_warn(&radio->videodev.dev, 228 "tune timed out after %u ms\n", tune_timeout); 229 230 /* stop tuning */ 231 radio->registers[CHANNEL] &= ~CHANNEL_TUNE; 232 retval = si470x_set_register(radio, CHANNEL); 233 234 done: 235 return retval; 236 } 237 238 /* 239 * si470x_get_step - get channel spacing 240 */ 241 static unsigned int si470x_get_step(struct si470x_device *radio) 242 { 243 /* Spacing (kHz) */ 244 switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) { 245 /* 0: 200 kHz (USA, Australia) */ 246 case 0: 247 return 200 * 16; 248 /* 1: 100 kHz (Europe, Japan) */ 249 case 1: 250 return 100 * 16; 251 /* 2: 50 kHz */ 252 default: 253 return 50 * 16; 254 } 255 } 256 257 258 /* 259 * si470x_get_freq - get the frequency 260 */ 261 static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq) 262 { 263 int chan, retval; 264 265 /* read channel */ 266 retval = si470x_get_register(radio, READCHAN); 267 chan = radio->registers[READCHAN] & READCHAN_READCHAN; 268 269 /* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */ 270 *freq = chan * si470x_get_step(radio) + bands[radio->band].rangelow; 271 272 return retval; 273 } 274 275 276 /* 277 * si470x_set_freq - set the frequency 278 */ 279 int si470x_set_freq(struct si470x_device *radio, unsigned int freq) 280 { 281 unsigned short chan; 282 283 freq = clamp(freq, bands[radio->band].rangelow, 284 bands[radio->band].rangehigh); 285 /* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */ 286 chan = (freq - bands[radio->band].rangelow) / si470x_get_step(radio); 287 288 return si470x_set_chan(radio, chan); 289 } 290 291 292 /* 293 * si470x_set_seek - set seek 294 */ 295 static int si470x_set_seek(struct si470x_device *radio, 296 const struct v4l2_hw_freq_seek *seek) 297 { 298 int band, retval; 299 unsigned int freq; 300 bool timed_out = false; 301 unsigned long time_left; 302 303 /* set band */ 304 if (seek->rangelow || seek->rangehigh) { 305 for (band = 0; band < ARRAY_SIZE(bands); band++) { 306 if (bands[band].rangelow == seek->rangelow && 307 bands[band].rangehigh == seek->rangehigh) 308 break; 309 } 310 if (band == ARRAY_SIZE(bands)) 311 return -EINVAL; /* No matching band found */ 312 } else 313 band = 1; /* If nothing is specified seek 76 - 108 Mhz */ 314 315 if (radio->band != band) { 316 retval = si470x_get_freq(radio, &freq); 317 if (retval) 318 return retval; 319 retval = si470x_set_band(radio, band); 320 if (retval) 321 return retval; 322 retval = si470x_set_freq(radio, freq); 323 if (retval) 324 return retval; 325 } 326 327 /* start seeking */ 328 radio->registers[POWERCFG] |= POWERCFG_SEEK; 329 if (seek->wrap_around) 330 radio->registers[POWERCFG] &= ~POWERCFG_SKMODE; 331 else 332 radio->registers[POWERCFG] |= POWERCFG_SKMODE; 333 if (seek->seek_upward) 334 radio->registers[POWERCFG] |= POWERCFG_SEEKUP; 335 else 336 radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP; 337 retval = si470x_set_register(radio, POWERCFG); 338 if (retval < 0) 339 return retval; 340 341 /* wait till tune operation has completed */ 342 reinit_completion(&radio->completion); 343 time_left = wait_for_completion_timeout(&radio->completion, 344 msecs_to_jiffies(seek_timeout)); 345 if (time_left == 0) 346 timed_out = true; 347 348 if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0) 349 dev_warn(&radio->videodev.dev, "seek does not complete\n"); 350 if (radio->registers[STATUSRSSI] & STATUSRSSI_SF) 351 dev_warn(&radio->videodev.dev, 352 "seek failed / band limit reached\n"); 353 354 /* stop seeking */ 355 radio->registers[POWERCFG] &= ~POWERCFG_SEEK; 356 retval = si470x_set_register(radio, POWERCFG); 357 358 /* try again, if timed out */ 359 if (retval == 0 && timed_out) 360 return -ENODATA; 361 return retval; 362 } 363 364 365 /* 366 * si470x_start - switch on radio 367 */ 368 int si470x_start(struct si470x_device *radio) 369 { 370 int retval; 371 372 /* powercfg */ 373 radio->registers[POWERCFG] = 374 POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM; 375 retval = si470x_set_register(radio, POWERCFG); 376 if (retval < 0) 377 goto done; 378 379 /* sysconfig 1 */ 380 radio->registers[SYSCONFIG1] = 381 (de << 11) & SYSCONFIG1_DE; /* DE*/ 382 retval = si470x_set_register(radio, SYSCONFIG1); 383 if (retval < 0) 384 goto done; 385 386 /* sysconfig 2 */ 387 radio->registers[SYSCONFIG2] = 388 (0x1f << 8) | /* SEEKTH */ 389 ((radio->band << 6) & SYSCONFIG2_BAND) |/* BAND */ 390 ((space << 4) & SYSCONFIG2_SPACE) | /* SPACE */ 391 15; /* VOLUME (max) */ 392 retval = si470x_set_register(radio, SYSCONFIG2); 393 if (retval < 0) 394 goto done; 395 396 /* reset last channel */ 397 retval = si470x_set_chan(radio, 398 radio->registers[CHANNEL] & CHANNEL_CHAN); 399 400 done: 401 return retval; 402 } 403 404 405 /* 406 * si470x_stop - switch off radio 407 */ 408 int si470x_stop(struct si470x_device *radio) 409 { 410 int retval; 411 412 /* sysconfig 1 */ 413 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS; 414 retval = si470x_set_register(radio, SYSCONFIG1); 415 if (retval < 0) 416 goto done; 417 418 /* powercfg */ 419 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE; 420 /* POWERCFG_ENABLE has to automatically go low */ 421 radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE; 422 retval = si470x_set_register(radio, POWERCFG); 423 424 done: 425 return retval; 426 } 427 428 429 /* 430 * si470x_rds_on - switch on rds reception 431 */ 432 static int si470x_rds_on(struct si470x_device *radio) 433 { 434 int retval; 435 436 /* sysconfig 1 */ 437 radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS; 438 retval = si470x_set_register(radio, SYSCONFIG1); 439 if (retval < 0) 440 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS; 441 442 return retval; 443 } 444 445 446 447 /************************************************************************** 448 * File Operations Interface 449 **************************************************************************/ 450 451 /* 452 * si470x_fops_read - read RDS data 453 */ 454 static ssize_t si470x_fops_read(struct file *file, char __user *buf, 455 size_t count, loff_t *ppos) 456 { 457 struct si470x_device *radio = video_drvdata(file); 458 int retval = 0; 459 unsigned int block_count = 0; 460 461 /* switch on rds reception */ 462 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) 463 si470x_rds_on(radio); 464 465 /* block if no new data available */ 466 while (radio->wr_index == radio->rd_index) { 467 if (file->f_flags & O_NONBLOCK) { 468 retval = -EWOULDBLOCK; 469 goto done; 470 } 471 if (wait_event_interruptible(radio->read_queue, 472 radio->wr_index != radio->rd_index) < 0) { 473 retval = -EINTR; 474 goto done; 475 } 476 } 477 478 /* calculate block count from byte count */ 479 count /= 3; 480 481 /* copy RDS block out of internal buffer and to user buffer */ 482 while (block_count < count) { 483 if (radio->rd_index == radio->wr_index) 484 break; 485 486 /* always transfer rds complete blocks */ 487 if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3)) 488 /* retval = -EFAULT; */ 489 break; 490 491 /* increment and wrap read pointer */ 492 radio->rd_index += 3; 493 if (radio->rd_index >= radio->buf_size) 494 radio->rd_index = 0; 495 496 /* increment counters */ 497 block_count++; 498 buf += 3; 499 retval += 3; 500 } 501 502 done: 503 return retval; 504 } 505 506 507 /* 508 * si470x_fops_poll - poll RDS data 509 */ 510 static unsigned int si470x_fops_poll(struct file *file, 511 struct poll_table_struct *pts) 512 { 513 struct si470x_device *radio = video_drvdata(file); 514 unsigned long req_events = poll_requested_events(pts); 515 int retval = v4l2_ctrl_poll(file, pts); 516 517 if (req_events & (POLLIN | POLLRDNORM)) { 518 /* switch on rds reception */ 519 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0) 520 si470x_rds_on(radio); 521 522 poll_wait(file, &radio->read_queue, pts); 523 524 if (radio->rd_index != radio->wr_index) 525 retval |= POLLIN | POLLRDNORM; 526 } 527 528 return retval; 529 } 530 531 532 /* 533 * si470x_fops - file operations interface 534 */ 535 static const struct v4l2_file_operations si470x_fops = { 536 .owner = THIS_MODULE, 537 .read = si470x_fops_read, 538 .poll = si470x_fops_poll, 539 .unlocked_ioctl = video_ioctl2, 540 .open = si470x_fops_open, 541 .release = si470x_fops_release, 542 }; 543 544 545 546 /************************************************************************** 547 * Video4Linux Interface 548 **************************************************************************/ 549 550 551 static int si470x_s_ctrl(struct v4l2_ctrl *ctrl) 552 { 553 struct si470x_device *radio = 554 container_of(ctrl->handler, struct si470x_device, hdl); 555 556 switch (ctrl->id) { 557 case V4L2_CID_AUDIO_VOLUME: 558 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME; 559 radio->registers[SYSCONFIG2] |= ctrl->val; 560 return si470x_set_register(radio, SYSCONFIG2); 561 case V4L2_CID_AUDIO_MUTE: 562 if (ctrl->val) 563 radio->registers[POWERCFG] &= ~POWERCFG_DMUTE; 564 else 565 radio->registers[POWERCFG] |= POWERCFG_DMUTE; 566 return si470x_set_register(radio, POWERCFG); 567 default: 568 return -EINVAL; 569 } 570 } 571 572 573 /* 574 * si470x_vidioc_g_tuner - get tuner attributes 575 */ 576 static int si470x_vidioc_g_tuner(struct file *file, void *priv, 577 struct v4l2_tuner *tuner) 578 { 579 struct si470x_device *radio = video_drvdata(file); 580 int retval = 0; 581 582 if (tuner->index != 0) 583 return -EINVAL; 584 585 if (!radio->status_rssi_auto_update) { 586 retval = si470x_get_register(radio, STATUSRSSI); 587 if (retval < 0) 588 return retval; 589 } 590 591 /* driver constants */ 592 strcpy(tuner->name, "FM"); 593 tuner->type = V4L2_TUNER_RADIO; 594 tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO | 595 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO | 596 V4L2_TUNER_CAP_HWSEEK_BOUNDED | 597 V4L2_TUNER_CAP_HWSEEK_WRAP; 598 tuner->rangelow = 76 * FREQ_MUL; 599 tuner->rangehigh = 108 * FREQ_MUL; 600 601 /* stereo indicator == stereo (instead of mono) */ 602 if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0) 603 tuner->rxsubchans = V4L2_TUNER_SUB_MONO; 604 else 605 tuner->rxsubchans = V4L2_TUNER_SUB_STEREO; 606 /* If there is a reliable method of detecting an RDS channel, 607 then this code should check for that before setting this 608 RDS subchannel. */ 609 tuner->rxsubchans |= V4L2_TUNER_SUB_RDS; 610 611 /* mono/stereo selector */ 612 if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0) 613 tuner->audmode = V4L2_TUNER_MODE_STEREO; 614 else 615 tuner->audmode = V4L2_TUNER_MODE_MONO; 616 617 /* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */ 618 /* measured in units of dbµV in 1 db increments (max at ~75 dbµV) */ 619 tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI); 620 /* the ideal factor is 0xffff/75 = 873,8 */ 621 tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10); 622 if (tuner->signal > 0xffff) 623 tuner->signal = 0xffff; 624 625 /* automatic frequency control: -1: freq to low, 1 freq to high */ 626 /* AFCRL does only indicate that freq. differs, not if too low/high */ 627 tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0; 628 629 return retval; 630 } 631 632 633 /* 634 * si470x_vidioc_s_tuner - set tuner attributes 635 */ 636 static int si470x_vidioc_s_tuner(struct file *file, void *priv, 637 const struct v4l2_tuner *tuner) 638 { 639 struct si470x_device *radio = video_drvdata(file); 640 641 if (tuner->index != 0) 642 return -EINVAL; 643 644 /* mono/stereo selector */ 645 switch (tuner->audmode) { 646 case V4L2_TUNER_MODE_MONO: 647 radio->registers[POWERCFG] |= POWERCFG_MONO; /* force mono */ 648 break; 649 case V4L2_TUNER_MODE_STEREO: 650 default: 651 radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */ 652 break; 653 } 654 655 return si470x_set_register(radio, POWERCFG); 656 } 657 658 659 /* 660 * si470x_vidioc_g_frequency - get tuner or modulator radio frequency 661 */ 662 static int si470x_vidioc_g_frequency(struct file *file, void *priv, 663 struct v4l2_frequency *freq) 664 { 665 struct si470x_device *radio = video_drvdata(file); 666 667 if (freq->tuner != 0) 668 return -EINVAL; 669 670 freq->type = V4L2_TUNER_RADIO; 671 return si470x_get_freq(radio, &freq->frequency); 672 } 673 674 675 /* 676 * si470x_vidioc_s_frequency - set tuner or modulator radio frequency 677 */ 678 static int si470x_vidioc_s_frequency(struct file *file, void *priv, 679 const struct v4l2_frequency *freq) 680 { 681 struct si470x_device *radio = video_drvdata(file); 682 int retval; 683 684 if (freq->tuner != 0) 685 return -EINVAL; 686 687 if (freq->frequency < bands[radio->band].rangelow || 688 freq->frequency > bands[radio->band].rangehigh) { 689 /* Switch to band 1 which covers everything we support */ 690 retval = si470x_set_band(radio, 1); 691 if (retval) 692 return retval; 693 } 694 return si470x_set_freq(radio, freq->frequency); 695 } 696 697 698 /* 699 * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek 700 */ 701 static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv, 702 const struct v4l2_hw_freq_seek *seek) 703 { 704 struct si470x_device *radio = video_drvdata(file); 705 706 if (seek->tuner != 0) 707 return -EINVAL; 708 709 if (file->f_flags & O_NONBLOCK) 710 return -EWOULDBLOCK; 711 712 return si470x_set_seek(radio, seek); 713 } 714 715 /* 716 * si470x_vidioc_enum_freq_bands - enumerate supported bands 717 */ 718 static int si470x_vidioc_enum_freq_bands(struct file *file, void *priv, 719 struct v4l2_frequency_band *band) 720 { 721 if (band->tuner != 0) 722 return -EINVAL; 723 if (band->index >= ARRAY_SIZE(bands)) 724 return -EINVAL; 725 *band = bands[band->index]; 726 return 0; 727 } 728 729 const struct v4l2_ctrl_ops si470x_ctrl_ops = { 730 .s_ctrl = si470x_s_ctrl, 731 }; 732 733 /* 734 * si470x_ioctl_ops - video device ioctl operations 735 */ 736 static const struct v4l2_ioctl_ops si470x_ioctl_ops = { 737 .vidioc_querycap = si470x_vidioc_querycap, 738 .vidioc_g_tuner = si470x_vidioc_g_tuner, 739 .vidioc_s_tuner = si470x_vidioc_s_tuner, 740 .vidioc_g_frequency = si470x_vidioc_g_frequency, 741 .vidioc_s_frequency = si470x_vidioc_s_frequency, 742 .vidioc_s_hw_freq_seek = si470x_vidioc_s_hw_freq_seek, 743 .vidioc_enum_freq_bands = si470x_vidioc_enum_freq_bands, 744 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event, 745 .vidioc_unsubscribe_event = v4l2_event_unsubscribe, 746 }; 747 748 749 /* 750 * si470x_viddev_template - video device interface 751 */ 752 struct video_device si470x_viddev_template = { 753 .fops = &si470x_fops, 754 .name = DRIVER_NAME, 755 .release = video_device_release_empty, 756 .ioctl_ops = &si470x_ioctl_ops, 757 }; 758