drivers/media/radio/radio-gemtek.c

   1 /* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
   2  *
   3  * GemTek hasn't released any specs on the card, so the protocol had to
   4  * be reverse engineered with dosemu.
   5  *
   6  * Besides the protocol changes, this is mostly a copy of:
   7  *
   8  *    RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
   9  *
  10  *    Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
  11  *    Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
  12  *    Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
  13  *
  14  * TODO: Allow for more than one of these foolish entities :-)
  15  *
  16  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  17  */
  18
  19 #include <linux/module.h>       /* Modules                      */
  20 #include <linux/init.h>         /* Initdata                     */
  21 #include <linux/ioport.h>       /* request_region               */
  22 #include <linux/delay.h>        /* udelay                       */
  23 #include <linux/videodev2.h>    /* kernel radio structs         */
  24 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  25 #include <linux/mutex.h>
  26 #include <linux/io.h>           /* outb, outb_p                 */
  27 #include <media/v4l2-ioctl.h>
  28 #include <media/v4l2-device.h>
  29
  30 #define RADIO_VERSION KERNEL_VERSION(0, 0, 3)
  31
  32 /*
  33  * Module info.
  34  */
  35
  36 MODULE_AUTHOR("Jonas Munsin, Pekka Seppänen <pexu@kapsi.fi>");
  37 MODULE_DESCRIPTION("A driver for the GemTek Radio card.");
  38 MODULE_LICENSE("GPL");
  39
  40 /*
  41  * Module params.
  42  */
  43
  44 #ifndef CONFIG_RADIO_GEMTEK_PORT
  45 #define CONFIG_RADIO_GEMTEK_PORT -1
  46 #endif
  47 #ifndef CONFIG_RADIO_GEMTEK_PROBE
  48 #define CONFIG_RADIO_GEMTEK_PROBE 1
  49 #endif
  50
  51 static int io           = CONFIG_RADIO_GEMTEK_PORT;
  52 static int probe        = CONFIG_RADIO_GEMTEK_PROBE;
  53 static int hardmute;
  54 static int shutdown     = 1;
  55 static int keepmuted    = 1;
  56 static int initmute     = 1;
  57 static int radio_nr     = -1;
  58
  59 module_param(io, int, 0444);
  60 MODULE_PARM_DESC(io, "Force I/O port for the GemTek Radio card if automatic "
  61          "probing is disabled or fails. The most common I/O ports are: 0x20c "
  62          "0x30c, 0x24c or 0x34c (0x20c, 0x248 and 0x28c have been reported to "
  63          "work for the combined sound/radiocard).");
  64
  65 module_param(probe, bool, 0444);
  66 MODULE_PARM_DESC(probe, "Enable automatic device probing. Note: only the most "
  67         "common I/O ports used by the card are probed.");
  68
  69 module_param(hardmute, bool, 0644);
  70 MODULE_PARM_DESC(hardmute, "Enable `hard muting' by shutting down PLL, may "
  71          "reduce static noise.");
  72
  73 module_param(shutdown, bool, 0644);
  74 MODULE_PARM_DESC(shutdown, "Enable shutting down PLL and muting line when "
  75          "module is unloaded.");
  76
  77 module_param(keepmuted, bool, 0644);
  78 MODULE_PARM_DESC(keepmuted, "Keep card muted even when frequency is changed.");
  79
  80 module_param(initmute, bool, 0444);
  81 MODULE_PARM_DESC(initmute, "Mute card when module is loaded.");
  82
  83 module_param(radio_nr, int, 0444);
  84
  85 /*
  86  * Functions for controlling the card.
  87  */
  88 #define GEMTEK_LOWFREQ  (87*16000)
  89 #define GEMTEK_HIGHFREQ (108*16000)
  90
  91 /*
  92  * Frequency calculation constants.  Intermediate frequency 10.52 MHz (nominal
  93  * value 10.7 MHz), reference divisor 6.39 kHz (nominal 6.25 kHz).
  94  */
  95 #define FSCALE          8
  96 #define IF_OFFSET       ((unsigned int)(10.52 * 16000 * (1<<FSCALE)))
  97 #define REF_FREQ        ((unsigned int)(6.39 * 16 * (1<<FSCALE)))
  98
  99 #define GEMTEK_CK               0x01    /* Clock signal                 */
 100 #define GEMTEK_DA               0x02    /* Serial data                  */
 101 #define GEMTEK_CE               0x04    /* Chip enable                  */
 102 #define GEMTEK_NS               0x08    /* No signal                    */
 103 #define GEMTEK_MT               0x10    /* Line mute                    */
 104 #define GEMTEK_STDF_3_125_KHZ   0x01    /* Standard frequency 3.125 kHz */
 105 #define GEMTEK_PLL_OFF          0x07    /* PLL off                      */
 106
 107 #define BU2614_BUS_SIZE 32      /* BU2614 / BU2614FS bus size           */
 108
 109 #define SHORT_DELAY 5           /* usec */
 110 #define LONG_DELAY 75           /* usec */
 111
 112 struct gemtek {
 113         struct v4l2_device v4l2_dev;
 114         struct video_device vdev;
 115         struct mutex lock;
 116         unsigned long lastfreq;
 117         int muted;
 118         int verified;
 119         int io;
 120         u32 bu2614data;
 121 };
 122
 123 static struct gemtek gemtek_card;
 124
 125 #define BU2614_FREQ_BITS        16 /* D0..D15, Frequency data           */
 126 #define BU2614_PORT_BITS        3 /* P0..P2, Output port control data   */
 127 #define BU2614_VOID_BITS        4 /* unused                             */
 128 #define BU2614_FMES_BITS        1 /* CT, Frequency measurement beginning data */
 129 #define BU2614_STDF_BITS        3 /* R0..R2, Standard frequency data    */
 130 #define BU2614_SWIN_BITS        1 /* S, Switch between FMIN / AMIN      */
 131 #define BU2614_SWAL_BITS        1 /* PS, Swallow counter division (AMIN only)*/
 132 #define BU2614_VOID2_BITS       1 /* unused                             */
 133 #define BU2614_FMUN_BITS        1 /* GT, Frequency measurement time & unlock */
 134 #define BU2614_TEST_BITS        1 /* TS, Test data is input             */
 135
 136 #define BU2614_FREQ_SHIFT       0
 137 #define BU2614_PORT_SHIFT       (BU2614_FREQ_BITS + BU2614_FREQ_SHIFT)
 138 #define BU2614_VOID_SHIFT       (BU2614_PORT_BITS + BU2614_PORT_SHIFT)
 139 #define BU2614_FMES_SHIFT       (BU2614_VOID_BITS + BU2614_VOID_SHIFT)
 140 #define BU2614_STDF_SHIFT       (BU2614_FMES_BITS + BU2614_FMES_SHIFT)
 141 #define BU2614_SWIN_SHIFT       (BU2614_STDF_BITS + BU2614_STDF_SHIFT)
 142 #define BU2614_SWAL_SHIFT       (BU2614_SWIN_BITS + BU2614_SWIN_SHIFT)
 143 #define BU2614_VOID2_SHIFT      (BU2614_SWAL_BITS + BU2614_SWAL_SHIFT)
 144 #define BU2614_FMUN_SHIFT       (BU2614_VOID2_BITS + BU2614_VOID2_SHIFT)
 145 #define BU2614_TEST_SHIFT       (BU2614_FMUN_BITS + BU2614_FMUN_SHIFT)
 146
 147 #define MKMASK(field)   (((1<<BU2614_##field##_BITS) - 1) << \
 148                         BU2614_##field##_SHIFT)
 149 #define BU2614_PORT_MASK        MKMASK(PORT)
 150 #define BU2614_FREQ_MASK        MKMASK(FREQ)
 151 #define BU2614_VOID_MASK        MKMASK(VOID)
 152 #define BU2614_FMES_MASK        MKMASK(FMES)
 153 #define BU2614_STDF_MASK        MKMASK(STDF)
 154 #define BU2614_SWIN_MASK        MKMASK(SWIN)
 155 #define BU2614_SWAL_MASK        MKMASK(SWAL)
 156 #define BU2614_VOID2_MASK       MKMASK(VOID2)
 157 #define BU2614_FMUN_MASK        MKMASK(FMUN)
 158 #define BU2614_TEST_MASK        MKMASK(TEST)
 159
 160 /*
 161  * Set data which will be sent to BU2614FS.
 162  */
 163 #define gemtek_bu2614_set(dev, field, data) ((dev)->bu2614data = \
 164         ((dev)->bu2614data & ~field##_MASK) | ((data) << field##_SHIFT))
 165
 166 /*
 167  * Transmit settings to BU2614FS over GemTek IC.
 168  */
 169 static void gemtek_bu2614_transmit(struct gemtek *gt)
 170 {
 171         int i, bit, q, mute;
 172
 173         mutex_lock(&gt->lock);
 174
 175         mute = gt->muted ? GEMTEK_MT : 0x00;
 176
 177         outb_p(mute | GEMTEK_DA | GEMTEK_CK, gt->io);
 178         udelay(SHORT_DELAY);
 179         outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, gt->io);
 180         udelay(LONG_DELAY);
 181
 182         for (i = 0, q = gt->bu2614data; i < 32; i++, q >>= 1) {
 183                 bit = (q & 1) ? GEMTEK_DA : 0;
 184                 outb_p(mute | GEMTEK_CE | bit, gt->io);
 185                 udelay(SHORT_DELAY);
 186                 outb_p(mute | GEMTEK_CE | bit | GEMTEK_CK, gt->io);
 187                 udelay(SHORT_DELAY);
 188         }
 189
 190         outb_p(mute | GEMTEK_DA | GEMTEK_CK, gt->io);
 191         udelay(SHORT_DELAY);
 192         outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, gt->io);
 193         udelay(LONG_DELAY);
 194
 195         mutex_unlock(&gt->lock);
 196 }
 197
 198 /*
 199  * Calculate divisor from FM-frequency for BU2614FS (3.125 KHz STDF expected).
 200  */
 201 static unsigned long gemtek_convfreq(unsigned long freq)
 202 {
 203         return ((freq<<FSCALE) + IF_OFFSET + REF_FREQ/2) / REF_FREQ;
 204 }
 205
 206 /*
 207  * Set FM-frequency.
 208  */
 209 static void gemtek_setfreq(struct gemtek *gt, unsigned long freq)
 210 {
 211         if (keepmuted && hardmute && gt->muted)
 212                 return;
 213
 214         freq = clamp_val(freq, GEMTEK_LOWFREQ, GEMTEK_HIGHFREQ);
 215
 216         gt->lastfreq = freq;
 217         gt->muted = 0;
 218
 219         gemtek_bu2614_set(gt, BU2614_PORT, 0);
 220         gemtek_bu2614_set(gt, BU2614_FMES, 0);
 221         gemtek_bu2614_set(gt, BU2614_SWIN, 0);  /* FM-mode      */
 222         gemtek_bu2614_set(gt, BU2614_SWAL, 0);
 223         gemtek_bu2614_set(gt, BU2614_FMUN, 1);  /* GT bit set   */
 224         gemtek_bu2614_set(gt, BU2614_TEST, 0);
 225
 226         gemtek_bu2614_set(gt, BU2614_STDF, GEMTEK_STDF_3_125_KHZ);
 227         gemtek_bu2614_set(gt, BU2614_FREQ, gemtek_convfreq(freq));
 228
 229         gemtek_bu2614_transmit(gt);
 230 }
 231
 232 /*
 233  * Set mute flag.
 234  */
 235 static void gemtek_mute(struct gemtek *gt)
 236 {
 237         int i;
 238
 239         gt->muted = 1;
 240
 241         if (hardmute) {
 242                 /* Turn off PLL, disable data output */
 243                 gemtek_bu2614_set(gt, BU2614_PORT, 0);
 244                 gemtek_bu2614_set(gt, BU2614_FMES, 0);  /* CT bit off   */
 245                 gemtek_bu2614_set(gt, BU2614_SWIN, 0);  /* FM-mode      */
 246                 gemtek_bu2614_set(gt, BU2614_SWAL, 0);
 247                 gemtek_bu2614_set(gt, BU2614_FMUN, 0);  /* GT bit off   */
 248                 gemtek_bu2614_set(gt, BU2614_TEST, 0);
 249                 gemtek_bu2614_set(gt, BU2614_STDF, GEMTEK_PLL_OFF);
 250                 gemtek_bu2614_set(gt, BU2614_FREQ, 0);
 251                 gemtek_bu2614_transmit(gt);
 252                 return;
 253         }
 254
 255         mutex_lock(&gt->lock);
 256
 257         /* Read bus contents (CE, CK and DA). */
 258         i = inb_p(gt->io);
 259         /* Write it back with mute flag set. */
 260         outb_p((i >> 5) | GEMTEK_MT, gt->io);
 261         udelay(SHORT_DELAY);
 262
 263         mutex_unlock(&gt->lock);
 264 }
 265
 266 /*
 267  * Unset mute flag.
 268  */
 269 static void gemtek_unmute(struct gemtek *gt)
 270 {
 271         int i;
 272
 273         gt->muted = 0;
 274         if (hardmute) {
 275                 /* Turn PLL back on. */
 276                 gemtek_setfreq(gt, gt->lastfreq);
 277                 return;
 278         }
 279         mutex_lock(&gt->lock);
 280
 281         i = inb_p(gt->io);
 282         outb_p(i >> 5, gt->io);
 283         udelay(SHORT_DELAY);
 284
 285         mutex_unlock(&gt->lock);
 286 }
 287
 288 /*
 289  * Get signal strength (= stereo status).
 290  */
 291 static inline int gemtek_getsigstr(struct gemtek *gt)
 292 {
 293         int sig;
 294
 295         mutex_lock(&gt->lock);
 296         sig = inb_p(gt->io) & GEMTEK_NS ? 0 : 1;
 297         mutex_unlock(&gt->lock);
 298         return sig;
 299 }
 300
 301 /*
 302  * Check if requested card acts like GemTek Radio card.
 303  */
 304 static int gemtek_verify(struct gemtek *gt, int port)
 305 {
 306         int i, q;
 307
 308         if (gt->verified == port)
 309                 return 1;
 310
 311         mutex_lock(&gt->lock);
 312
 313         q = inb_p(port);        /* Read bus contents before probing. */
 314         /* Try to turn on CE, CK and DA respectively and check if card responds
 315            properly. */
 316         for (i = 0; i < 3; ++i) {
 317                 outb_p(1 << i, port);
 318                 udelay(SHORT_DELAY);
 319
 320                 if ((inb_p(port) & (~GEMTEK_NS)) != (0x17 | (1 << (i + 5)))) {
 321                         mutex_unlock(&gt->lock);
 322                         return 0;
 323                 }
 324         }
 325         outb_p(q >> 5, port);   /* Write bus contents back. */
 326         udelay(SHORT_DELAY);
 327
 328         mutex_unlock(&gt->lock);
 329         gt->verified = port;
 330
 331         return 1;
 332 }
 333
 334 /*
 335  * Automatic probing for card.
 336  */
 337 static int gemtek_probe(struct gemtek *gt)
 338 {
 339         struct v4l2_device *v4l2_dev = &gt->v4l2_dev;
 340         int ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
 341         int i;
 342
 343         if (!probe) {
 344                 v4l2_info(v4l2_dev, "Automatic device probing disabled.\n");
 345                 return -1;
 346         }
 347
 348         v4l2_info(v4l2_dev, "Automatic device probing enabled.\n");
 349
 350         for (i = 0; i < ARRAY_SIZE(ioports); ++i) {
 351                 v4l2_info(v4l2_dev, "Trying I/O port 0x%x...\n", ioports[i]);
 352
 353                 if (!request_region(ioports[i], 1, "gemtek-probe")) {
 354                         v4l2_warn(v4l2_dev, "I/O port 0x%x busy!\n",
 355                                ioports[i]);
 356                         continue;
 357                 }
 358
 359                 if (gemtek_verify(gt, ioports[i])) {
 360                         v4l2_info(v4l2_dev, "Card found from I/O port "
 361                                "0x%x!\n", ioports[i]);
 362
 363                         release_region(ioports[i], 1);
 364                         gt->io = ioports[i];
 365                         return gt->io;
 366                 }
 367
 368                 release_region(ioports[i], 1);
 369         }
 370
 371         v4l2_err(v4l2_dev, "Automatic probing failed!\n");
 372         return -1;
 373 }
 374
 375 /*
 376  * Video 4 Linux stuff.
 377  */
 378 static int gemtek_open(struct file *file)
 379 {
 380         return 0;
 381 }
 382
 383 static int gemtek_release(struct file *file)
 384 {
 385         return 0;
 386 }
 387
 388 static const struct v4l2_file_operations gemtek_fops = {
 389         .owner          = THIS_MODULE,
 390         .open           = gemtek_open,
 391         .release        = gemtek_release,
 392         .ioctl          = video_ioctl2,
 393 };
 394
 395 static int vidioc_querycap(struct file *file, void *priv,
 396                            struct v4l2_capability *v)
 397 {
 398         strlcpy(v->driver, "radio-gemtek", sizeof(v->driver));
 399         strlcpy(v->card, "GemTek", sizeof(v->card));
 400         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 401         v->version = RADIO_VERSION;
 402         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 403         return 0;
 404 }
 405
 406 static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
 407 {
 408         struct gemtek *gt = video_drvdata(file);
 409
 410         if (v->index > 0)
 411                 return -EINVAL;
 412
 413         strlcpy(v->name, "FM", sizeof(v->name));
 414         v->type = V4L2_TUNER_RADIO;
 415         v->rangelow = GEMTEK_LOWFREQ;
 416         v->rangehigh = GEMTEK_HIGHFREQ;
 417         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 418         v->signal = 0xffff * gemtek_getsigstr(gt);
 419         if (v->signal) {
 420                 v->audmode = V4L2_TUNER_MODE_STEREO;
 421                 v->rxsubchans = V4L2_TUNER_SUB_STEREO;
 422         } else {
 423                 v->audmode = V4L2_TUNER_MODE_MONO;
 424                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 425         }
 426         return 0;
 427 }
 428
 429 static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
 430 {
 431         return (v->index != 0) ? -EINVAL : 0;
 432 }
 433
 434 static int vidioc_g_frequency(struct file *file, void *priv,
 435                               struct v4l2_frequency *f)
 436 {
 437         struct gemtek *gt = video_drvdata(file);
 438
 439         if (f->tuner != 0)
 440                 return -EINVAL;
 441         f->type = V4L2_TUNER_RADIO;
 442         f->frequency = gt->lastfreq;
 443         return 0;
 444 }
 445
 446 static int vidioc_s_frequency(struct file *file, void *priv,
 447                               struct v4l2_frequency *f)
 448 {
 449         struct gemtek *gt = video_drvdata(file);
 450
 451         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 452                 return -EINVAL;
 453         gemtek_setfreq(gt, f->frequency);
 454         return 0;
 455 }
 456
 457 static int vidioc_queryctrl(struct file *file, void *priv,
 458                             struct v4l2_queryctrl *qc)
 459 {
 460         switch (qc->id) {
 461         case V4L2_CID_AUDIO_MUTE:
 462                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
 463         default:
 464                 return -EINVAL;
 465         }
 466 }
 467
 468 static int vidioc_g_ctrl(struct file *file, void *priv,
 469                          struct v4l2_control *ctrl)
 470 {
 471         struct gemtek *gt = video_drvdata(file);
 472
 473         switch (ctrl->id) {
 474         case V4L2_CID_AUDIO_MUTE:
 475                 ctrl->value = gt->muted;
 476                 return 0;
 477         }
 478         return -EINVAL;
 479 }
 480
 481 static int vidioc_s_ctrl(struct file *file, void *priv,
 482                          struct v4l2_control *ctrl)
 483 {
 484         struct gemtek *gt = video_drvdata(file);
 485
 486         switch (ctrl->id) {
 487         case V4L2_CID_AUDIO_MUTE:
 488                 if (ctrl->value)
 489                         gemtek_mute(gt);
 490                 else
 491                         gemtek_unmute(gt);
 492                 return 0;
 493         }
 494         return -EINVAL;
 495 }
 496
 497 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 498 {
 499         *i = 0;
 500         return 0;
 501 }
 502
 503 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 504 {
 505         return (i != 0) ? -EINVAL : 0;
 506 }
 507
 508 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
 509 {
 510         a->index = 0;
 511         strlcpy(a->name, "Radio", sizeof(a->name));
 512         a->capability = V4L2_AUDCAP_STEREO;
 513         return 0;
 514 }
 515
 516 static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
 517 {
 518         return (a->index != 0) ? -EINVAL : 0;
 519 }
 520
 521 static const struct v4l2_ioctl_ops gemtek_ioctl_ops = {
 522         .vidioc_querycap        = vidioc_querycap,
 523         .vidioc_g_tuner         = vidioc_g_tuner,
 524         .vidioc_s_tuner         = vidioc_s_tuner,
 525         .vidioc_g_audio         = vidioc_g_audio,
 526         .vidioc_s_audio         = vidioc_s_audio,
 527         .vidioc_g_input         = vidioc_g_input,
 528         .vidioc_s_input         = vidioc_s_input,
 529         .vidioc_g_frequency     = vidioc_g_frequency,
 530         .vidioc_s_frequency     = vidioc_s_frequency,
 531         .vidioc_queryctrl       = vidioc_queryctrl,
 532         .vidioc_g_ctrl          = vidioc_g_ctrl,
 533         .vidioc_s_ctrl          = vidioc_s_ctrl
 534 };
 535
 536 /*
 537  * Initialization / cleanup related stuff.
 538  */
 539
 540 static int __init gemtek_init(void)
 541 {
 542         struct gemtek *gt = &gemtek_card;
 543         struct v4l2_device *v4l2_dev = &gt->v4l2_dev;
 544         int res;
 545
 546         strlcpy(v4l2_dev->name, "gemtek", sizeof(v4l2_dev->name));
 547
 548         v4l2_info(v4l2_dev, "GemTek Radio card driver: v0.0.3\n");
 549
 550         mutex_init(&gt->lock);
 551
 552         gt->verified = -1;
 553         gt->io = io;
 554         gemtek_probe(gt);
 555         if (gt->io) {
 556                 if (!request_region(gt->io, 1, "gemtek")) {
 557                         v4l2_err(v4l2_dev, "I/O port 0x%x already in use.\n", gt->io);
 558                         return -EBUSY;
 559                 }
 560
 561                 if (!gemtek_verify(gt, gt->io))
 562                         v4l2_warn(v4l2_dev, "Card at I/O port 0x%x does not "
 563                                "respond properly, check your "
 564                                "configuration.\n", gt->io);
 565                 else
 566                         v4l2_info(v4l2_dev, "Using I/O port 0x%x.\n", gt->io);
 567         } else if (probe) {
 568                 v4l2_err(v4l2_dev, "Automatic probing failed and no "
 569                        "fixed I/O port defined.\n");
 570                 return -ENODEV;
 571         } else {
 572                 v4l2_err(v4l2_dev, "Automatic probing disabled but no fixed "
 573                        "I/O port defined.");
 574                 return -EINVAL;
 575         }
 576
 577         res = v4l2_device_register(NULL, v4l2_dev);
 578         if (res < 0) {
 579                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 580                 release_region(gt->io, 1);
 581                 return res;
 582         }
 583
 584         strlcpy(gt->vdev.name, v4l2_dev->name, sizeof(gt->vdev.name));
 585         gt->vdev.v4l2_dev = v4l2_dev;
 586         gt->vdev.fops = &gemtek_fops;
 587         gt->vdev.ioctl_ops = &gemtek_ioctl_ops;
 588         gt->vdev.release = video_device_release_empty;
 589         video_set_drvdata(&gt->vdev, gt);
 590
 591         if (video_register_device(&gt->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 592                 v4l2_device_unregister(v4l2_dev);
 593                 release_region(gt->io, 1);
 594                 return -EBUSY;
 595         }
 596
 597         /* Set defaults */
 598         gt->lastfreq = GEMTEK_LOWFREQ;
 599         gt->bu2614data = 0;
 600
 601         if (initmute)
 602                 gemtek_mute(gt);
 603
 604         return 0;
 605 }
 606
 607 /*
 608  * Module cleanup
 609  */
 610 static void __exit gemtek_exit(void)
 611 {
 612         struct gemtek *gt = &gemtek_card;
 613         struct v4l2_device *v4l2_dev = &gt->v4l2_dev;
 614
 615         if (shutdown) {
 616                 hardmute = 1;   /* Turn off PLL */
 617                 gemtek_mute(gt);
 618         } else {
 619                 v4l2_info(v4l2_dev, "Module unloaded but card not muted!\n");
 620         }
 621
 622         video_unregister_device(&gt->vdev);
 623         v4l2_device_unregister(&gt->v4l2_dev);
 624         release_region(gt->io, 1);
 625 }
 626
 627 module_init(gemtek_init);
 628 module_exit(gemtek_exit);