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.Cox@linux.org>
  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 <asm/io.h>             /* outb, outb_p                 */
  24 #include <asm/uaccess.h>        /* copy to/from user            */
  25 #include <linux/videodev2.h>    /* kernel radio structs         */
  26 #include <media/v4l2-common.h>
  27 #include <linux/spinlock.h>
  28
  29 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  30 #define RADIO_VERSION KERNEL_VERSION(0,0,3)
  31 #define RADIO_BANNER "GemTek Radio card driver: v0.0.3"
  32
  33 /*
  34  * Module info.
  35  */
  36
  37 MODULE_AUTHOR("Jonas Munsin, Pekka Seppänen <pexu@kapsi.fi>");
  38 MODULE_DESCRIPTION("A driver for the GemTek Radio card.");
  39 MODULE_LICENSE("GPL");
  40
  41 /*
  42  * Module params.
  43  */
  44
  45 #ifndef CONFIG_RADIO_GEMTEK_PORT
  46 #define CONFIG_RADIO_GEMTEK_PORT -1
  47 #endif
  48 #ifndef CONFIG_RADIO_GEMTEK_PROBE
  49 #define CONFIG_RADIO_GEMTEK_PROBE 1
  50 #endif
  51
  52 static int io           = CONFIG_RADIO_GEMTEK_PORT;
  53 static int probe        = CONFIG_RADIO_GEMTEK_PROBE;
  54 static int hardmute;
  55 static int shutdown     = 1;
  56 static int keepmuted    = 1;
  57 static int initmute     = 1;
  58 static int radio_nr     = -1;
  59
  60 module_param(io, int, 0444);
  61 MODULE_PARM_DESC(io, "Force I/O port for the GemTek Radio card if automatic "
  62          "probing is disabled or fails. The most common I/O ports are: 0x20c "
  63          "0x30c, 0x24c or 0x34c (0x20c, 0x248 and 0x28c have been reported to "
  64          "work for the combined sound/radiocard).");
  65
  66 module_param(probe, bool, 0444);
  67 MODULE_PARM_DESC(probe, "Enable automatic device probing. Note: only the most "
  68         "common I/O ports used by the card are probed.");
  69
  70 module_param(hardmute, bool, 0644);
  71 MODULE_PARM_DESC(hardmute, "Enable `hard muting' by shutting down PLL, may "
  72          "reduce static noise.");
  73
  74 module_param(shutdown, bool, 0644);
  75 MODULE_PARM_DESC(shutdown, "Enable shutting down PLL and muting line when "
  76          "module is unloaded.");
  77
  78 module_param(keepmuted, bool, 0644);
  79 MODULE_PARM_DESC(keepmuted, "Keep card muted even when frequency is changed.");
  80
  81 module_param(initmute, bool, 0444);
  82 MODULE_PARM_DESC(initmute, "Mute card when module is loaded.");
  83
  84 module_param(radio_nr, int, 0444);
  85
  86 /*
  87  * Functions for controlling the card.
  88  */
  89 #define GEMTEK_LOWFREQ  (87*16000)
  90 #define GEMTEK_HIGHFREQ (108*16000)
  91
  92 /*
  93  * Frequency calculation constants.  Intermediate frequency 10.52 MHz (nominal
  94  * value 10.7 MHz), reference divisor 6.39 kHz (nominal 6.25 kHz).
  95  */
  96 #define FSCALE          8
  97 #define IF_OFFSET       ((unsigned int)(10.52 * 16000 * (1<<FSCALE)))
  98 #define REF_FREQ        ((unsigned int)(6.39 * 16 * (1<<FSCALE)))
  99
 100 #define GEMTEK_CK               0x01    /* Clock signal                 */
 101 #define GEMTEK_DA               0x02    /* Serial data                  */
 102 #define GEMTEK_CE               0x04    /* Chip enable                  */
 103 #define GEMTEK_NS               0x08    /* No signal                    */
 104 #define GEMTEK_MT               0x10    /* Line mute                    */
 105 #define GEMTEK_STDF_3_125_KHZ   0x01    /* Standard frequency 3.125 kHz */
 106 #define GEMTEK_PLL_OFF          0x07    /* PLL off                      */
 107
 108 #define BU2614_BUS_SIZE 32      /* BU2614 / BU2614FS bus size           */
 109
 110 #define SHORT_DELAY 5           /* usec */
 111 #define LONG_DELAY 75           /* usec */
 112
 113 struct gemtek_device {
 114         unsigned long lastfreq;
 115         int muted;
 116         u32 bu2614data;
 117 };
 118
 119 #define BU2614_FREQ_BITS        16 /* D0..D15, Frequency data           */
 120 #define BU2614_PORT_BITS        3 /* P0..P2, Output port control data   */
 121 #define BU2614_VOID_BITS        4 /* unused                             */
 122 #define BU2614_FMES_BITS        1 /* CT, Frequency measurement beginning data */
 123 #define BU2614_STDF_BITS        3 /* R0..R2, Standard frequency data    */
 124 #define BU2614_SWIN_BITS        1 /* S, Switch between FMIN / AMIN      */
 125 #define BU2614_SWAL_BITS        1 /* PS, Swallow counter division (AMIN only)*/
 126 #define BU2614_VOID2_BITS       1 /* unused                             */
 127 #define BU2614_FMUN_BITS        1 /* GT, Frequency measurement time & unlock */
 128 #define BU2614_TEST_BITS        1 /* TS, Test data is input             */
 129
 130 #define BU2614_FREQ_SHIFT       0
 131 #define BU2614_PORT_SHIFT       (BU2614_FREQ_BITS + BU2614_FREQ_SHIFT)
 132 #define BU2614_VOID_SHIFT       (BU2614_PORT_BITS + BU2614_PORT_SHIFT)
 133 #define BU2614_FMES_SHIFT       (BU2614_VOID_BITS + BU2614_VOID_SHIFT)
 134 #define BU2614_STDF_SHIFT       (BU2614_FMES_BITS + BU2614_FMES_SHIFT)
 135 #define BU2614_SWIN_SHIFT       (BU2614_STDF_BITS + BU2614_STDF_SHIFT)
 136 #define BU2614_SWAL_SHIFT       (BU2614_SWIN_BITS + BU2614_SWIN_SHIFT)
 137 #define BU2614_VOID2_SHIFT      (BU2614_SWAL_BITS + BU2614_SWAL_SHIFT)
 138 #define BU2614_FMUN_SHIFT       (BU2614_VOID2_BITS + BU2614_VOID2_SHIFT)
 139 #define BU2614_TEST_SHIFT       (BU2614_FMUN_BITS + BU2614_FMUN_SHIFT)
 140
 141 #define MKMASK(field)   (((1<<BU2614_##field##_BITS) - 1) << \
 142                         BU2614_##field##_SHIFT)
 143 #define BU2614_PORT_MASK        MKMASK(PORT)
 144 #define BU2614_FREQ_MASK        MKMASK(FREQ)
 145 #define BU2614_VOID_MASK        MKMASK(VOID)
 146 #define BU2614_FMES_MASK        MKMASK(FMES)
 147 #define BU2614_STDF_MASK        MKMASK(STDF)
 148 #define BU2614_SWIN_MASK        MKMASK(SWIN)
 149 #define BU2614_SWAL_MASK        MKMASK(SWAL)
 150 #define BU2614_VOID2_MASK       MKMASK(VOID2)
 151 #define BU2614_FMUN_MASK        MKMASK(FMUN)
 152 #define BU2614_TEST_MASK        MKMASK(TEST)
 153
 154 static struct gemtek_device gemtek_unit;
 155
 156 static spinlock_t lock;
 157
 158 /*
 159  * Set data which will be sent to BU2614FS.
 160  */
 161 #define gemtek_bu2614_set(dev, field, data) ((dev)->bu2614data = \
 162         ((dev)->bu2614data & ~field##_MASK) | ((data) << field##_SHIFT))
 163
 164 /*
 165  * Transmit settings to BU2614FS over GemTek IC.
 166  */
 167 static void gemtek_bu2614_transmit(struct gemtek_device *dev)
 168 {
 169         int i, bit, q, mute;
 170
 171         spin_lock(&lock);
 172
 173         mute = dev->muted ? GEMTEK_MT : 0x00;
 174
 175         outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
 176         udelay(SHORT_DELAY);
 177         outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
 178         udelay(LONG_DELAY);
 179
 180         for (i = 0, q = dev->bu2614data; i < 32; i++, q >>= 1) {
 181             bit = (q & 1) ? GEMTEK_DA : 0;
 182             outb_p(mute | GEMTEK_CE | bit, io);
 183             udelay(SHORT_DELAY);
 184             outb_p(mute | GEMTEK_CE | bit | GEMTEK_CK, io);
 185             udelay(SHORT_DELAY);
 186         }
 187
 188         outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
 189         udelay(SHORT_DELAY);
 190         outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
 191         udelay(LONG_DELAY);
 192
 193         spin_unlock(&lock);
 194 }
 195
 196 /*
 197  * Calculate divisor from FM-frequency for BU2614FS (3.125 KHz STDF expected).
 198  */
 199 static unsigned long gemtek_convfreq(unsigned long freq)
 200 {
 201         return ((freq<<FSCALE) + IF_OFFSET + REF_FREQ/2) / REF_FREQ;
 202 }
 203
 204 /*
 205  * Set FM-frequency.
 206  */
 207 static void gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
 208 {
 209
 210         if (keepmuted && hardmute && dev->muted)
 211                 return;
 212
 213         if (freq < GEMTEK_LOWFREQ)
 214                 freq = GEMTEK_LOWFREQ;
 215         else if (freq > GEMTEK_HIGHFREQ)
 216                 freq = GEMTEK_HIGHFREQ;
 217
 218         dev->lastfreq = freq;
 219         dev->muted = 0;
 220
 221         gemtek_bu2614_set(dev, BU2614_PORT, 0);
 222         gemtek_bu2614_set(dev, BU2614_FMES, 0);
 223         gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode      */
 224         gemtek_bu2614_set(dev, BU2614_SWAL, 0);
 225         gemtek_bu2614_set(dev, BU2614_FMUN, 1); /* GT bit set   */
 226         gemtek_bu2614_set(dev, BU2614_TEST, 0);
 227
 228         gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_STDF_3_125_KHZ);
 229         gemtek_bu2614_set(dev, BU2614_FREQ, gemtek_convfreq(freq));
 230
 231         gemtek_bu2614_transmit(dev);
 232 }
 233
 234 /*
 235  * Set mute flag.
 236  */
 237 static void gemtek_mute(struct gemtek_device *dev)
 238 {
 239         int i;
 240         dev->muted = 1;
 241
 242         if (hardmute) {
 243                 /* Turn off PLL, disable data output */
 244                 gemtek_bu2614_set(dev, BU2614_PORT, 0);
 245                 gemtek_bu2614_set(dev, BU2614_FMES, 0); /* CT bit off   */
 246                 gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode      */
 247                 gemtek_bu2614_set(dev, BU2614_SWAL, 0);
 248                 gemtek_bu2614_set(dev, BU2614_FMUN, 0); /* GT bit off   */
 249                 gemtek_bu2614_set(dev, BU2614_TEST, 0);
 250                 gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_PLL_OFF);
 251                 gemtek_bu2614_set(dev, BU2614_FREQ, 0);
 252                 gemtek_bu2614_transmit(dev);
 253         } else {
 254                 spin_lock(&lock);
 255
 256                 /* Read bus contents (CE, CK and DA). */
 257                 i = inb_p(io);
 258                 /* Write it back with mute flag set. */
 259                 outb_p((i >> 5) | GEMTEK_MT, io);
 260                 udelay(SHORT_DELAY);
 261
 262                 spin_unlock(&lock);
 263         }
 264 }
 265
 266 /*
 267  * Unset mute flag.
 268  */
 269 static void gemtek_unmute(struct gemtek_device *dev)
 270 {
 271         int i;
 272         dev->muted = 0;
 273
 274         if (hardmute) {
 275                 /* Turn PLL back on. */
 276                 gemtek_setfreq(dev, dev->lastfreq);
 277         } else {
 278                 spin_lock(&lock);
 279
 280                 i = inb_p(io);
 281                 outb_p(i >> 5, io);
 282                 udelay(SHORT_DELAY);
 283
 284                 spin_unlock(&lock);
 285         }
 286 }
 287
 288 /*
 289  * Get signal strength (= stereo status).
 290  */
 291 static inline int gemtek_getsigstr(void)
 292 {
 293         return inb_p(io) & GEMTEK_NS ? 0 : 1;
 294 }
 295
 296 /*
 297  * Check if requested card acts like GemTek Radio card.
 298  */
 299 static int gemtek_verify(int port)
 300 {
 301         static int verified = -1;
 302         int i, q;
 303
 304         if (verified == port)
 305                 return 1;
 306
 307         spin_lock(&lock);
 308
 309         q = inb_p(port);        /* Read bus contents before probing. */
 310         /* Try to turn on CE, CK and DA respectively and check if card responds
 311            properly. */
 312         for (i = 0; i < 3; ++i) {
 313                 outb_p(1 << i, port);
 314                 udelay(SHORT_DELAY);
 315
 316                 if ((inb_p(port) & (~GEMTEK_NS)) != (0x17 | (1 << (i + 5)))) {
 317                         spin_unlock(&lock);
 318                         return 0;
 319                 }
 320         }
 321         outb_p(q >> 5, port);   /* Write bus contents back. */
 322         udelay(SHORT_DELAY);
 323
 324         spin_unlock(&lock);
 325         verified = port;
 326
 327         return 1;
 328 }
 329
 330 /*
 331  * Automatic probing for card.
 332  */
 333 static int gemtek_probe(void)
 334 {
 335         int ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
 336         int i;
 337
 338         if (!probe) {
 339                 printk(KERN_INFO "Automatic device probing disabled.\n");
 340                 return -1;
 341         }
 342
 343         printk(KERN_INFO "Automatic device probing enabled.\n");
 344
 345         for (i = 0; i < ARRAY_SIZE(ioports); ++i) {
 346                 printk(KERN_INFO "Trying I/O port 0x%x...\n", ioports[i]);
 347
 348                 if (!request_region(ioports[i], 1, "gemtek-probe")) {
 349                         printk(KERN_WARNING "I/O port 0x%x busy!\n",
 350                                ioports[i]);
 351                         continue;
 352                 }
 353
 354                 if (gemtek_verify(ioports[i])) {
 355                         printk(KERN_INFO "Card found from I/O port "
 356                                "0x%x!\n", ioports[i]);
 357
 358                         release_region(ioports[i], 1);
 359
 360                         io = ioports[i];
 361                         return io;
 362                 }
 363
 364                 release_region(ioports[i], 1);
 365         }
 366
 367         printk(KERN_ERR "Automatic probing failed!\n");
 368
 369         return -1;
 370 }
 371
 372 /*
 373  * Video 4 Linux stuff.
 374  */
 375
 376 static struct v4l2_queryctrl radio_qctrl[] = {
 377         {
 378                 .id = V4L2_CID_AUDIO_MUTE,
 379                 .name = "Mute",
 380                 .minimum = 0,
 381                 .maximum = 1,
 382                 .default_value = 1,
 383                 .type = V4L2_CTRL_TYPE_BOOLEAN,
 384         }, {
 385                 .id = V4L2_CID_AUDIO_VOLUME,
 386                 .name = "Volume",
 387                 .minimum = 0,
 388                 .maximum = 65535,
 389                 .step = 65535,
 390                 .default_value = 0xff,
 391                 .type = V4L2_CTRL_TYPE_INTEGER,
 392         }
 393 };
 394
 395 static const struct file_operations gemtek_fops = {
 396         .owner          = THIS_MODULE,
 397         .open           = video_exclusive_open,
 398         .release        = video_exclusive_release,
 399         .ioctl          = video_ioctl2,
 400         .compat_ioctl   = v4l_compat_ioctl32,
 401         .llseek         = no_llseek
 402 };
 403
 404 static int vidioc_querycap(struct file *file, void *priv,
 405                            struct v4l2_capability *v)
 406 {
 407         strlcpy(v->driver, "radio-gemtek", sizeof(v->driver));
 408         strlcpy(v->card, "GemTek", sizeof(v->card));
 409         sprintf(v->bus_info, "ISA");
 410         v->version = RADIO_VERSION;
 411         v->capabilities = V4L2_CAP_TUNER;
 412         return 0;
 413 }
 414
 415 static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
 416 {
 417         if (v->index > 0)
 418                 return -EINVAL;
 419
 420         strcpy(v->name, "FM");
 421         v->type = V4L2_TUNER_RADIO;
 422         v->rangelow = GEMTEK_LOWFREQ;
 423         v->rangehigh = GEMTEK_HIGHFREQ;
 424         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 425         v->signal = 0xffff * gemtek_getsigstr();
 426         if (v->signal) {
 427                 v->audmode = V4L2_TUNER_MODE_STEREO;
 428                 v->rxsubchans = V4L2_TUNER_SUB_STEREO;
 429         } else {
 430                 v->audmode = V4L2_TUNER_MODE_MONO;
 431                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 432         }
 433
 434         return 0;
 435 }
 436
 437 static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
 438 {
 439         if (v->index > 0)
 440                 return -EINVAL;
 441         return 0;
 442 }
 443
 444 static int vidioc_s_frequency(struct file *file, void *priv,
 445                               struct v4l2_frequency *f)
 446 {
 447         struct video_device *dev = video_devdata(file);
 448         struct gemtek_device *rt = dev->priv;
 449
 450         gemtek_setfreq(rt, f->frequency);
 451
 452         return 0;
 453 }
 454
 455 static int vidioc_g_frequency(struct file *file, void *priv,
 456                               struct v4l2_frequency *f)
 457 {
 458         struct video_device *dev = video_devdata(file);
 459         struct gemtek_device *rt = dev->priv;
 460
 461         f->type = V4L2_TUNER_RADIO;
 462         f->frequency = rt->lastfreq;
 463         return 0;
 464 }
 465
 466 static int vidioc_queryctrl(struct file *file, void *priv,
 467                             struct v4l2_queryctrl *qc)
 468 {
 469         int i;
 470
 471         for (i = 0; i < ARRAY_SIZE(radio_qctrl); ++i) {
 472                 if (qc->id && qc->id == radio_qctrl[i].id) {
 473                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 474                         return 0;
 475                 }
 476         }
 477         return -EINVAL;
 478 }
 479
 480 static int vidioc_g_ctrl(struct file *file, void *priv,
 481                          struct v4l2_control *ctrl)
 482 {
 483         struct video_device *dev = video_devdata(file);
 484         struct gemtek_device *rt = dev->priv;
 485
 486         switch (ctrl->id) {
 487         case V4L2_CID_AUDIO_MUTE:
 488                 ctrl->value = rt->muted;
 489                 return 0;
 490         case V4L2_CID_AUDIO_VOLUME:
 491                 if (rt->muted)
 492                         ctrl->value = 0;
 493                 else
 494                         ctrl->value = 65535;
 495                 return 0;
 496         }
 497         return -EINVAL;
 498 }
 499
 500 static int vidioc_s_ctrl(struct file *file, void *priv,
 501                          struct v4l2_control *ctrl)
 502 {
 503         struct video_device *dev = video_devdata(file);
 504         struct gemtek_device *rt = dev->priv;
 505
 506         switch (ctrl->id) {
 507         case V4L2_CID_AUDIO_MUTE:
 508                 if (ctrl->value)
 509                         gemtek_mute(rt);
 510                 else
 511                         gemtek_unmute(rt);
 512                 return 0;
 513         case V4L2_CID_AUDIO_VOLUME:
 514                 if (ctrl->value)
 515                         gemtek_unmute(rt);
 516                 else
 517                         gemtek_mute(rt);
 518                 return 0;
 519         }
 520         return -EINVAL;
 521 }
 522
 523 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
 524 {
 525         if (a->index > 1)
 526                 return -EINVAL;
 527
 528         strcpy(a->name, "Radio");
 529         a->capability = V4L2_AUDCAP_STEREO;
 530         return 0;
 531 }
 532
 533 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 534 {
 535         *i = 0;
 536         return 0;
 537 }
 538
 539 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 540 {
 541         if (i != 0)
 542                 return -EINVAL;
 543         return 0;
 544 }
 545
 546 static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
 547 {
 548         if (a->index != 0)
 549                 return -EINVAL;
 550         return 0;
 551 }
 552
 553 static struct video_device gemtek_radio = {
 554         .owner                  = THIS_MODULE,
 555         .name                   = "GemTek Radio card",
 556         .type                   = VID_TYPE_TUNER,
 557         .fops                   = &gemtek_fops,
 558         .vidioc_querycap        = vidioc_querycap,
 559         .vidioc_g_tuner         = vidioc_g_tuner,
 560         .vidioc_s_tuner         = vidioc_s_tuner,
 561         .vidioc_g_audio         = vidioc_g_audio,
 562         .vidioc_s_audio         = vidioc_s_audio,
 563         .vidioc_g_input         = vidioc_g_input,
 564         .vidioc_s_input         = vidioc_s_input,
 565         .vidioc_g_frequency     = vidioc_g_frequency,
 566         .vidioc_s_frequency     = vidioc_s_frequency,
 567         .vidioc_queryctrl       = vidioc_queryctrl,
 568         .vidioc_g_ctrl          = vidioc_g_ctrl,
 569         .vidioc_s_ctrl          = vidioc_s_ctrl
 570 };
 571
 572 /*
 573  * Initialization / cleanup related stuff.
 574  */
 575
 576 /*
 577  * Initilize card.
 578  */
 579 static int __init gemtek_init(void)
 580 {
 581         printk(KERN_INFO RADIO_BANNER "\n");
 582
 583         spin_lock_init(&lock);
 584
 585         gemtek_probe();
 586         if (io) {
 587                 if (!request_region(io, 1, "gemtek")) {
 588                         printk(KERN_ERR "I/O port 0x%x already in use.\n", io);
 589                         return -EBUSY;
 590                 }
 591
 592                 if (!gemtek_verify(io))
 593                         printk(KERN_WARNING "Card at I/O port 0x%x does not "
 594                                "respond properly, check your "
 595                                "configuration.\n", io);
 596                 else
 597                         printk(KERN_INFO "Using I/O port 0x%x.\n", io);
 598         } else if (probe) {
 599                 printk(KERN_ERR "Automatic probing failed and no "
 600                        "fixed I/O port defined.\n");
 601                 return -ENODEV;
 602         } else {
 603                 printk(KERN_ERR "Automatic probing disabled but no fixed "
 604                        "I/O port defined.");
 605                 return -EINVAL;
 606         }
 607
 608         gemtek_radio.priv = &gemtek_unit;
 609
 610         if (video_register_device(&gemtek_radio, VFL_TYPE_RADIO,
 611                 radio_nr) == -1) {
 612                 release_region(io, 1);
 613                 return -EBUSY;
 614         }
 615
 616         /* Set defaults */
 617         gemtek_unit.lastfreq = GEMTEK_LOWFREQ;
 618         gemtek_unit.bu2614data = 0;
 619
 620         if (initmute)
 621                 gemtek_mute(&gemtek_unit);
 622
 623         return 0;
 624 }
 625
 626 /*
 627  * Module cleanup
 628  */
 629 static void __exit gemtek_exit(void)
 630 {
 631         if (shutdown) {
 632                 hardmute = 1;   /* Turn off PLL */
 633                 gemtek_mute(&gemtek_unit);
 634         } else {
 635                 printk(KERN_INFO "Module unloaded but card not muted!\n");
 636         }
 637
 638         video_unregister_device(&gemtek_radio);
 639         release_region(io, 1);
 640 }
 641
 642 module_init(gemtek_init);
 643 module_exit(gemtek_exit);