drivers/media/radio/si470x/radio-si470x-common.c

   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         /* currently I2C driver only uses interrupt way to tune */
 178         if (radio->stci_enabled) {
 179                 INIT_COMPLETION(radio->completion);
 180
 181                 /* wait till tune operation has completed */
 182                 retval = wait_for_completion_timeout(&radio->completion,
 183                                 msecs_to_jiffies(tune_timeout));
 184                 if (!retval)
 185                         timed_out = true;
 186         } else {
 187                 /* wait till tune operation has completed */
 188                 timeout = jiffies + msecs_to_jiffies(tune_timeout);
 189                 do {
 190                         retval = si470x_get_register(radio, STATUSRSSI);
 191                         if (retval < 0)
 192                                 goto stop;
 193                         timed_out = time_after(jiffies, timeout);
 194                 } while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
 195                                 && (!timed_out));
 196         }
 197
 198         if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
 199                 dev_warn(&radio->videodev.dev, "tune does not complete\n");
 200         if (timed_out)
 201                 dev_warn(&radio->videodev.dev,
 202                         "tune timed out after %u ms\n", tune_timeout);
 203
 204 stop:
 205         /* stop tuning */
 206         radio->registers[CHANNEL] &= ~CHANNEL_TUNE;
 207         retval = si470x_set_register(radio, CHANNEL);
 208
 209 done:
 210         return retval;
 211 }
 212
 213
 214 /*
 215  * si470x_get_freq - get the frequency
 216  */
 217 static int si470x_get_freq(struct si470x_device *radio, unsigned int *freq)
 218 {
 219         unsigned int spacing, band_bottom;
 220         unsigned short chan;
 221         int retval;
 222
 223         /* Spacing (kHz) */
 224         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
 225         /* 0: 200 kHz (USA, Australia) */
 226         case 0:
 227                 spacing = 0.200 * FREQ_MUL; break;
 228         /* 1: 100 kHz (Europe, Japan) */
 229         case 1:
 230                 spacing = 0.100 * FREQ_MUL; break;
 231         /* 2:  50 kHz */
 232         default:
 233                 spacing = 0.050 * FREQ_MUL; break;
 234         };
 235
 236         /* Bottom of Band (MHz) */
 237         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
 238         /* 0: 87.5 - 108 MHz (USA, Europe) */
 239         case 0:
 240                 band_bottom = 87.5 * FREQ_MUL; break;
 241         /* 1: 76   - 108 MHz (Japan wide band) */
 242         default:
 243                 band_bottom = 76   * FREQ_MUL; break;
 244         /* 2: 76   -  90 MHz (Japan) */
 245         case 2:
 246                 band_bottom = 76   * FREQ_MUL; break;
 247         };
 248
 249         /* read channel */
 250         retval = si470x_get_register(radio, READCHAN);
 251         chan = radio->registers[READCHAN] & READCHAN_READCHAN;
 252
 253         /* Frequency (MHz) = Spacing (kHz) x Channel + Bottom of Band (MHz) */
 254         *freq = chan * spacing + band_bottom;
 255
 256         return retval;
 257 }
 258
 259
 260 /*
 261  * si470x_set_freq - set the frequency
 262  */
 263 int si470x_set_freq(struct si470x_device *radio, unsigned int freq)
 264 {
 265         unsigned int spacing, band_bottom, band_top;
 266         unsigned short chan;
 267
 268         /* Spacing (kHz) */
 269         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_SPACE) >> 4) {
 270         /* 0: 200 kHz (USA, Australia) */
 271         case 0:
 272                 spacing = 0.200 * FREQ_MUL; break;
 273         /* 1: 100 kHz (Europe, Japan) */
 274         case 1:
 275                 spacing = 0.100 * FREQ_MUL; break;
 276         /* 2:  50 kHz */
 277         default:
 278                 spacing = 0.050 * FREQ_MUL; break;
 279         };
 280
 281         /* Bottom/Top of Band (MHz) */
 282         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
 283         /* 0: 87.5 - 108 MHz (USA, Europe) */
 284         case 0:
 285                 band_bottom = 87.5 * FREQ_MUL;
 286                 band_top = 108 * FREQ_MUL;
 287                 break;
 288         /* 1: 76   - 108 MHz (Japan wide band) */
 289         default:
 290                 band_bottom = 76 * FREQ_MUL;
 291                 band_top = 108 * FREQ_MUL;
 292                 break;
 293         /* 2: 76   -  90 MHz (Japan) */
 294         case 2:
 295                 band_bottom = 76 * FREQ_MUL;
 296                 band_top = 90 * FREQ_MUL;
 297                 break;
 298         };
 299
 300         freq = clamp(freq, band_bottom, band_top);
 301         /* Chan = [ Freq (Mhz) - Bottom of Band (MHz) ] / Spacing (kHz) */
 302         chan = (freq - band_bottom) / spacing;
 303
 304         return si470x_set_chan(radio, chan);
 305 }
 306
 307
 308 /*
 309  * si470x_set_seek - set seek
 310  */
 311 static int si470x_set_seek(struct si470x_device *radio,
 312                 unsigned int wrap_around, unsigned int seek_upward)
 313 {
 314         int retval = 0;
 315         unsigned long timeout;
 316         bool timed_out = 0;
 317
 318         /* start seeking */
 319         radio->registers[POWERCFG] |= POWERCFG_SEEK;
 320         if (wrap_around == 1)
 321                 radio->registers[POWERCFG] &= ~POWERCFG_SKMODE;
 322         else
 323                 radio->registers[POWERCFG] |= POWERCFG_SKMODE;
 324         if (seek_upward == 1)
 325                 radio->registers[POWERCFG] |= POWERCFG_SEEKUP;
 326         else
 327                 radio->registers[POWERCFG] &= ~POWERCFG_SEEKUP;
 328         retval = si470x_set_register(radio, POWERCFG);
 329         if (retval < 0)
 330                 return retval;
 331
 332         /* currently I2C driver only uses interrupt way to seek */
 333         if (radio->stci_enabled) {
 334                 INIT_COMPLETION(radio->completion);
 335
 336                 /* wait till seek operation has completed */
 337                 retval = wait_for_completion_timeout(&radio->completion,
 338                                 msecs_to_jiffies(seek_timeout));
 339                 if (!retval)
 340                         timed_out = true;
 341         } else {
 342                 /* wait till seek operation has completed */
 343                 timeout = jiffies + msecs_to_jiffies(seek_timeout);
 344                 do {
 345                         retval = si470x_get_register(radio, STATUSRSSI);
 346                         if (retval < 0)
 347                                 goto stop;
 348                         timed_out = time_after(jiffies, timeout);
 349                 } while (((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
 350                                 && (!timed_out));
 351         }
 352
 353         if ((radio->registers[STATUSRSSI] & STATUSRSSI_STC) == 0)
 354                 dev_warn(&radio->videodev.dev, "seek does not complete\n");
 355         if (radio->registers[STATUSRSSI] & STATUSRSSI_SF)
 356                 dev_warn(&radio->videodev.dev,
 357                         "seek failed / band limit reached\n");
 358
 359 stop:
 360         /* stop seeking */
 361         radio->registers[POWERCFG] &= ~POWERCFG_SEEK;
 362         retval = si470x_set_register(radio, POWERCFG);
 363
 364         /* try again, if timed out */
 365         if (retval == 0 && timed_out)
 366                 return -EAGAIN;
 367         return retval;
 368 }
 369
 370
 371 /*
 372  * si470x_start - switch on radio
 373  */
 374 int si470x_start(struct si470x_device *radio)
 375 {
 376         int retval;
 377
 378         /* powercfg */
 379         radio->registers[POWERCFG] =
 380                 POWERCFG_DMUTE | POWERCFG_ENABLE | POWERCFG_RDSM;
 381         retval = si470x_set_register(radio, POWERCFG);
 382         if (retval < 0)
 383                 goto done;
 384
 385         /* sysconfig 1 */
 386         radio->registers[SYSCONFIG1] =
 387                 (de << 11) & SYSCONFIG1_DE;             /* DE*/
 388         retval = si470x_set_register(radio, SYSCONFIG1);
 389         if (retval < 0)
 390                 goto done;
 391
 392         /* sysconfig 2 */
 393         radio->registers[SYSCONFIG2] =
 394                 (0x3f  << 8) |                          /* SEEKTH */
 395                 ((band  << 6) & SYSCONFIG2_BAND)  |     /* BAND */
 396                 ((space << 4) & SYSCONFIG2_SPACE) |     /* SPACE */
 397                 15;                                     /* VOLUME (max) */
 398         retval = si470x_set_register(radio, SYSCONFIG2);
 399         if (retval < 0)
 400                 goto done;
 401
 402         /* reset last channel */
 403         retval = si470x_set_chan(radio,
 404                 radio->registers[CHANNEL] & CHANNEL_CHAN);
 405
 406 done:
 407         return retval;
 408 }
 409
 410
 411 /*
 412  * si470x_stop - switch off radio
 413  */
 414 int si470x_stop(struct si470x_device *radio)
 415 {
 416         int retval;
 417
 418         /* sysconfig 1 */
 419         radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
 420         retval = si470x_set_register(radio, SYSCONFIG1);
 421         if (retval < 0)
 422                 goto done;
 423
 424         /* powercfg */
 425         radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
 426         /* POWERCFG_ENABLE has to automatically go low */
 427         radio->registers[POWERCFG] |= POWERCFG_ENABLE | POWERCFG_DISABLE;
 428         retval = si470x_set_register(radio, POWERCFG);
 429
 430 done:
 431         return retval;
 432 }
 433
 434
 435 /*
 436  * si470x_rds_on - switch on rds reception
 437  */
 438 static int si470x_rds_on(struct si470x_device *radio)
 439 {
 440         int retval;
 441
 442         /* sysconfig 1 */
 443         radio->registers[SYSCONFIG1] |= SYSCONFIG1_RDS;
 444         retval = si470x_set_register(radio, SYSCONFIG1);
 445         if (retval < 0)
 446                 radio->registers[SYSCONFIG1] &= ~SYSCONFIG1_RDS;
 447
 448         return retval;
 449 }
 450
 451
 452
 453 /**************************************************************************
 454  * File Operations Interface
 455  **************************************************************************/
 456
 457 /*
 458  * si470x_fops_read - read RDS data
 459  */
 460 static ssize_t si470x_fops_read(struct file *file, char __user *buf,
 461                 size_t count, loff_t *ppos)
 462 {
 463         struct si470x_device *radio = video_drvdata(file);
 464         int retval = 0;
 465         unsigned int block_count = 0;
 466
 467         /* switch on rds reception */
 468         if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
 469                 si470x_rds_on(radio);
 470
 471         /* block if no new data available */
 472         while (radio->wr_index == radio->rd_index) {
 473                 if (file->f_flags & O_NONBLOCK) {
 474                         retval = -EWOULDBLOCK;
 475                         goto done;
 476                 }
 477                 if (wait_event_interruptible(radio->read_queue,
 478                         radio->wr_index != radio->rd_index) < 0) {
 479                         retval = -EINTR;
 480                         goto done;
 481                 }
 482         }
 483
 484         /* calculate block count from byte count */
 485         count /= 3;
 486
 487         /* copy RDS block out of internal buffer and to user buffer */
 488         while (block_count < count) {
 489                 if (radio->rd_index == radio->wr_index)
 490                         break;
 491
 492                 /* always transfer rds complete blocks */
 493                 if (copy_to_user(buf, &radio->buffer[radio->rd_index], 3))
 494                         /* retval = -EFAULT; */
 495                         break;
 496
 497                 /* increment and wrap read pointer */
 498                 radio->rd_index += 3;
 499                 if (radio->rd_index >= radio->buf_size)
 500                         radio->rd_index = 0;
 501
 502                 /* increment counters */
 503                 block_count++;
 504                 buf += 3;
 505                 retval += 3;
 506         }
 507
 508 done:
 509         return retval;
 510 }
 511
 512
 513 /*
 514  * si470x_fops_poll - poll RDS data
 515  */
 516 static unsigned int si470x_fops_poll(struct file *file,
 517                 struct poll_table_struct *pts)
 518 {
 519         struct si470x_device *radio = video_drvdata(file);
 520         unsigned long req_events = poll_requested_events(pts);
 521         int retval = v4l2_ctrl_poll(file, pts);
 522
 523         if (req_events & (POLLIN | POLLRDNORM)) {
 524                 /* switch on rds reception */
 525                 if ((radio->registers[SYSCONFIG1] & SYSCONFIG1_RDS) == 0)
 526                         si470x_rds_on(radio);
 527
 528                 poll_wait(file, &radio->read_queue, pts);
 529
 530                 if (radio->rd_index != radio->wr_index)
 531                         retval |= POLLIN | POLLRDNORM;
 532         }
 533
 534         return retval;
 535 }
 536
 537
 538 /*
 539  * si470x_fops - file operations interface
 540  */
 541 static const struct v4l2_file_operations si470x_fops = {
 542         .owner                  = THIS_MODULE,
 543         .read                   = si470x_fops_read,
 544         .poll                   = si470x_fops_poll,
 545         .unlocked_ioctl         = video_ioctl2,
 546         .open                   = si470x_fops_open,
 547         .release                = si470x_fops_release,
 548 };
 549
 550
 551
 552 /**************************************************************************
 553  * Video4Linux Interface
 554  **************************************************************************/
 555
 556
 557 static int si470x_s_ctrl(struct v4l2_ctrl *ctrl)
 558 {
 559         struct si470x_device *radio =
 560                 container_of(ctrl->handler, struct si470x_device, hdl);
 561
 562         switch (ctrl->id) {
 563         case V4L2_CID_AUDIO_VOLUME:
 564                 radio->registers[SYSCONFIG2] &= ~SYSCONFIG2_VOLUME;
 565                 radio->registers[SYSCONFIG2] |= ctrl->val;
 566                 return si470x_set_register(radio, SYSCONFIG2);
 567         case V4L2_CID_AUDIO_MUTE:
 568                 if (ctrl->val)
 569                         radio->registers[POWERCFG] &= ~POWERCFG_DMUTE;
 570                 else
 571                         radio->registers[POWERCFG] |= POWERCFG_DMUTE;
 572                 return si470x_set_register(radio, POWERCFG);
 573         default:
 574                 return -EINVAL;
 575         }
 576 }
 577
 578
 579 /*
 580  * si470x_vidioc_g_tuner - get tuner attributes
 581  */
 582 static int si470x_vidioc_g_tuner(struct file *file, void *priv,
 583                 struct v4l2_tuner *tuner)
 584 {
 585         struct si470x_device *radio = video_drvdata(file);
 586         int retval;
 587
 588         if (tuner->index != 0)
 589                 return -EINVAL;
 590
 591         retval = si470x_get_register(radio, STATUSRSSI);
 592         if (retval < 0)
 593                 return retval;
 594
 595         /* driver constants */
 596         strcpy(tuner->name, "FM");
 597         tuner->type = V4L2_TUNER_RADIO;
 598         tuner->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
 599                             V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_BLOCK_IO;
 600
 601         /* range limits */
 602         switch ((radio->registers[SYSCONFIG2] & SYSCONFIG2_BAND) >> 6) {
 603         /* 0: 87.5 - 108 MHz (USA, Europe, default) */
 604         default:
 605                 tuner->rangelow  =  87.5 * FREQ_MUL;
 606                 tuner->rangehigh = 108   * FREQ_MUL;
 607                 break;
 608         /* 1: 76   - 108 MHz (Japan wide band) */
 609         case 1:
 610                 tuner->rangelow  =  76   * FREQ_MUL;
 611                 tuner->rangehigh = 108   * FREQ_MUL;
 612                 break;
 613         /* 2: 76   -  90 MHz (Japan) */
 614         case 2:
 615                 tuner->rangelow  =  76   * FREQ_MUL;
 616                 tuner->rangehigh =  90   * FREQ_MUL;
 617                 break;
 618         };
 619
 620         /* stereo indicator == stereo (instead of mono) */
 621         if ((radio->registers[STATUSRSSI] & STATUSRSSI_ST) == 0)
 622                 tuner->rxsubchans = V4L2_TUNER_SUB_MONO;
 623         else
 624                 tuner->rxsubchans = V4L2_TUNER_SUB_STEREO;
 625         /* If there is a reliable method of detecting an RDS channel,
 626            then this code should check for that before setting this
 627            RDS subchannel. */
 628         tuner->rxsubchans |= V4L2_TUNER_SUB_RDS;
 629
 630         /* mono/stereo selector */
 631         if ((radio->registers[POWERCFG] & POWERCFG_MONO) == 0)
 632                 tuner->audmode = V4L2_TUNER_MODE_STEREO;
 633         else
 634                 tuner->audmode = V4L2_TUNER_MODE_MONO;
 635
 636         /* min is worst, max is best; signal:0..0xffff; rssi: 0..0xff */
 637         /* measured in units of dbµV in 1 db increments (max at ~75 dbµV) */
 638         tuner->signal = (radio->registers[STATUSRSSI] & STATUSRSSI_RSSI);
 639         /* the ideal factor is 0xffff/75 = 873,8 */
 640         tuner->signal = (tuner->signal * 873) + (8 * tuner->signal / 10);
 641         if (tuner->signal > 0xffff)
 642                 tuner->signal = 0xffff;
 643
 644         /* automatic frequency control: -1: freq to low, 1 freq to high */
 645         /* AFCRL does only indicate that freq. differs, not if too low/high */
 646         tuner->afc = (radio->registers[STATUSRSSI] & STATUSRSSI_AFCRL) ? 1 : 0;
 647
 648         return retval;
 649 }
 650
 651
 652 /*
 653  * si470x_vidioc_s_tuner - set tuner attributes
 654  */
 655 static int si470x_vidioc_s_tuner(struct file *file, void *priv,
 656                 struct v4l2_tuner *tuner)
 657 {
 658         struct si470x_device *radio = video_drvdata(file);
 659
 660         if (tuner->index != 0)
 661                 return -EINVAL;
 662
 663         /* mono/stereo selector */
 664         switch (tuner->audmode) {
 665         case V4L2_TUNER_MODE_MONO:
 666                 radio->registers[POWERCFG] |= POWERCFG_MONO;  /* force mono */
 667                 break;
 668         case V4L2_TUNER_MODE_STEREO:
 669         default:
 670                 radio->registers[POWERCFG] &= ~POWERCFG_MONO; /* try stereo */
 671                 break;
 672         }
 673
 674         return si470x_set_register(radio, POWERCFG);
 675 }
 676
 677
 678 /*
 679  * si470x_vidioc_g_frequency - get tuner or modulator radio frequency
 680  */
 681 static int si470x_vidioc_g_frequency(struct file *file, void *priv,
 682                 struct v4l2_frequency *freq)
 683 {
 684         struct si470x_device *radio = video_drvdata(file);
 685
 686         if (freq->tuner != 0)
 687                 return -EINVAL;
 688
 689         freq->type = V4L2_TUNER_RADIO;
 690         return si470x_get_freq(radio, &freq->frequency);
 691 }
 692
 693
 694 /*
 695  * si470x_vidioc_s_frequency - set tuner or modulator radio frequency
 696  */
 697 static int si470x_vidioc_s_frequency(struct file *file, void *priv,
 698                 struct v4l2_frequency *freq)
 699 {
 700         struct si470x_device *radio = video_drvdata(file);
 701
 702         if (freq->tuner != 0)
 703                 return -EINVAL;
 704
 705         return si470x_set_freq(radio, freq->frequency);
 706 }
 707
 708
 709 /*
 710  * si470x_vidioc_s_hw_freq_seek - set hardware frequency seek
 711  */
 712 static int si470x_vidioc_s_hw_freq_seek(struct file *file, void *priv,
 713                 struct v4l2_hw_freq_seek *seek)
 714 {
 715         struct si470x_device *radio = video_drvdata(file);
 716
 717         if (seek->tuner != 0)
 718                 return -EINVAL;
 719
 720         return si470x_set_seek(radio, seek->wrap_around, seek->seek_upward);
 721 }
 722
 723 const struct v4l2_ctrl_ops si470x_ctrl_ops = {
 724         .s_ctrl = si470x_s_ctrl,
 725 };
 726
 727 /*
 728  * si470x_ioctl_ops - video device ioctl operations
 729  */
 730 static const struct v4l2_ioctl_ops si470x_ioctl_ops = {
 731         .vidioc_querycap        = si470x_vidioc_querycap,
 732         .vidioc_g_tuner         = si470x_vidioc_g_tuner,
 733         .vidioc_s_tuner         = si470x_vidioc_s_tuner,
 734         .vidioc_g_frequency     = si470x_vidioc_g_frequency,
 735         .vidioc_s_frequency     = si470x_vidioc_s_frequency,
 736         .vidioc_s_hw_freq_seek  = si470x_vidioc_s_hw_freq_seek,
 737         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 738         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 739 };
 740
 741
 742 /*
 743  * si470x_viddev_template - video device interface
 744  */
 745 struct video_device si470x_viddev_template = {
 746         .fops                   = &si470x_fops,
 747         .name                   = DRIVER_NAME,
 748         .release                = video_device_release_empty,
 749         .ioctl_ops              = &si470x_ioctl_ops,
 750 };