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-ioctl.h>
  27 #include <media/v4l2-common.h>
  28 #include <linux/spinlock.h>
  29
  30 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  31 #define RADIO_VERSION KERNEL_VERSION(0,0,3)
  32 #define RADIO_BANNER "GemTek Radio card driver: v0.0.3"
  33
  34 /*
  35  * Module info.
  36  */
  37
  38 MODULE_AUTHOR("Jonas Munsin, Pekka Seppänen <pexu@kapsi.fi>");
  39 MODULE_DESCRIPTION("A driver for the GemTek Radio card.");
  40 MODULE_LICENSE("GPL");
  41
  42 /*
  43  * Module params.
  44  */
  45
  46 #ifndef CONFIG_RADIO_GEMTEK_PORT
  47 #define CONFIG_RADIO_GEMTEK_PORT -1
  48 #endif
  49 #ifndef CONFIG_RADIO_GEMTEK_PROBE
  50 #define CONFIG_RADIO_GEMTEK_PROBE 1
  51 #endif
  52
  53 static int io           = CONFIG_RADIO_GEMTEK_PORT;
  54 static int probe        = CONFIG_RADIO_GEMTEK_PROBE;
  55 static int hardmute;
  56 static int shutdown     = 1;
  57 static int keepmuted    = 1;
  58 static int initmute     = 1;
  59 static int radio_nr     = -1;
  60
  61 module_param(io, int, 0444);
  62 MODULE_PARM_DESC(io, "Force I/O port for the GemTek Radio card if automatic "
  63          "probing is disabled or fails. The most common I/O ports are: 0x20c "
  64          "0x30c, 0x24c or 0x34c (0x20c, 0x248 and 0x28c have been reported to "
  65          "work for the combined sound/radiocard).");
  66
  67 module_param(probe, bool, 0444);
  68 MODULE_PARM_DESC(probe, "Enable automatic device probing. Note: only the most "
  69         "common I/O ports used by the card are probed.");
  70
  71 module_param(hardmute, bool, 0644);
  72 MODULE_PARM_DESC(hardmute, "Enable `hard muting' by shutting down PLL, may "
  73          "reduce static noise.");
  74
  75 module_param(shutdown, bool, 0644);
  76 MODULE_PARM_DESC(shutdown, "Enable shutting down PLL and muting line when "
  77          "module is unloaded.");
  78
  79 module_param(keepmuted, bool, 0644);
  80 MODULE_PARM_DESC(keepmuted, "Keep card muted even when frequency is changed.");
  81
  82 module_param(initmute, bool, 0444);
  83 MODULE_PARM_DESC(initmute, "Mute card when module is loaded.");
  84
  85 module_param(radio_nr, int, 0444);
  86
  87 /*
  88  * Functions for controlling the card.
  89  */
  90 #define GEMTEK_LOWFREQ  (87*16000)
  91 #define GEMTEK_HIGHFREQ (108*16000)
  92
  93 /*
  94  * Frequency calculation constants.  Intermediate frequency 10.52 MHz (nominal
  95  * value 10.7 MHz), reference divisor 6.39 kHz (nominal 6.25 kHz).
  96  */
  97 #define FSCALE          8
  98 #define IF_OFFSET       ((unsigned int)(10.52 * 16000 * (1<<FSCALE)))
  99 #define REF_FREQ        ((unsigned int)(6.39 * 16 * (1<<FSCALE)))
 100
 101 #define GEMTEK_CK               0x01    /* Clock signal                 */
 102 #define GEMTEK_DA               0x02    /* Serial data                  */
 103 #define GEMTEK_CE               0x04    /* Chip enable                  */
 104 #define GEMTEK_NS               0x08    /* No signal                    */
 105 #define GEMTEK_MT               0x10    /* Line mute                    */
 106 #define GEMTEK_STDF_3_125_KHZ   0x01    /* Standard frequency 3.125 kHz */
 107 #define GEMTEK_PLL_OFF          0x07    /* PLL off                      */
 108
 109 #define BU2614_BUS_SIZE 32      /* BU2614 / BU2614FS bus size           */
 110
 111 #define SHORT_DELAY 5           /* usec */
 112 #define LONG_DELAY 75           /* usec */
 113
 114 struct gemtek_device {
 115         unsigned long lastfreq;
 116         int muted;
 117         u32 bu2614data;
 118 };
 119
 120 #define BU2614_FREQ_BITS        16 /* D0..D15, Frequency data           */
 121 #define BU2614_PORT_BITS        3 /* P0..P2, Output port control data   */
 122 #define BU2614_VOID_BITS        4 /* unused                             */
 123 #define BU2614_FMES_BITS        1 /* CT, Frequency measurement beginning data */
 124 #define BU2614_STDF_BITS        3 /* R0..R2, Standard frequency data    */
 125 #define BU2614_SWIN_BITS        1 /* S, Switch between FMIN / AMIN      */
 126 #define BU2614_SWAL_BITS        1 /* PS, Swallow counter division (AMIN only)*/
 127 #define BU2614_VOID2_BITS       1 /* unused                             */
 128 #define BU2614_FMUN_BITS        1 /* GT, Frequency measurement time & unlock */
 129 #define BU2614_TEST_BITS        1 /* TS, Test data is input             */
 130
 131 #define BU2614_FREQ_SHIFT       0
 132 #define BU2614_PORT_SHIFT       (BU2614_FREQ_BITS + BU2614_FREQ_SHIFT)
 133 #define BU2614_VOID_SHIFT       (BU2614_PORT_BITS + BU2614_PORT_SHIFT)
 134 #define BU2614_FMES_SHIFT       (BU2614_VOID_BITS + BU2614_VOID_SHIFT)
 135 #define BU2614_STDF_SHIFT       (BU2614_FMES_BITS + BU2614_FMES_SHIFT)
 136 #define BU2614_SWIN_SHIFT       (BU2614_STDF_BITS + BU2614_STDF_SHIFT)
 137 #define BU2614_SWAL_SHIFT       (BU2614_SWIN_BITS + BU2614_SWIN_SHIFT)
 138 #define BU2614_VOID2_SHIFT      (BU2614_SWAL_BITS + BU2614_SWAL_SHIFT)
 139 #define BU2614_FMUN_SHIFT       (BU2614_VOID2_BITS + BU2614_VOID2_SHIFT)
 140 #define BU2614_TEST_SHIFT       (BU2614_FMUN_BITS + BU2614_FMUN_SHIFT)
 141
 142 #define MKMASK(field)   (((1<<BU2614_##field##_BITS) - 1) << \
 143                         BU2614_##field##_SHIFT)
 144 #define BU2614_PORT_MASK        MKMASK(PORT)
 145 #define BU2614_FREQ_MASK        MKMASK(FREQ)
 146 #define BU2614_VOID_MASK        MKMASK(VOID)
 147 #define BU2614_FMES_MASK        MKMASK(FMES)
 148 #define BU2614_STDF_MASK        MKMASK(STDF)
 149 #define BU2614_SWIN_MASK        MKMASK(SWIN)
 150 #define BU2614_SWAL_MASK        MKMASK(SWAL)
 151 #define BU2614_VOID2_MASK       MKMASK(VOID2)
 152 #define BU2614_FMUN_MASK        MKMASK(FMUN)
 153 #define BU2614_TEST_MASK        MKMASK(TEST)
 154
 155 static struct gemtek_device gemtek_unit;
 156
 157 static spinlock_t lock;
 158
 159 /*
 160  * Set data which will be sent to BU2614FS.
 161  */
 162 #define gemtek_bu2614_set(dev, field, data) ((dev)->bu2614data = \
 163         ((dev)->bu2614data & ~field##_MASK) | ((data) << field##_SHIFT))
 164
 165 /*
 166  * Transmit settings to BU2614FS over GemTek IC.
 167  */
 168 static void gemtek_bu2614_transmit(struct gemtek_device *dev)
 169 {
 170         int i, bit, q, mute;
 171
 172         spin_lock(&lock);
 173
 174         mute = dev->muted ? GEMTEK_MT : 0x00;
 175
 176         outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
 177         udelay(SHORT_DELAY);
 178         outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
 179         udelay(LONG_DELAY);
 180
 181         for (i = 0, q = dev->bu2614data; i < 32; i++, q >>= 1) {
 182             bit = (q & 1) ? GEMTEK_DA : 0;
 183             outb_p(mute | GEMTEK_CE | bit, io);
 184             udelay(SHORT_DELAY);
 185             outb_p(mute | GEMTEK_CE | bit | GEMTEK_CK, io);
 186             udelay(SHORT_DELAY);
 187         }
 188
 189         outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
 190         udelay(SHORT_DELAY);
 191         outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
 192         udelay(LONG_DELAY);
 193
 194         spin_unlock(&lock);
 195 }
 196
 197 /*
 198  * Calculate divisor from FM-frequency for BU2614FS (3.125 KHz STDF expected).
 199  */
 200 static unsigned long gemtek_convfreq(unsigned long freq)
 201 {
 202         return ((freq<<FSCALE) + IF_OFFSET + REF_FREQ/2) / REF_FREQ;
 203 }
 204
 205 /*
 206  * Set FM-frequency.
 207  */
 208 static void gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
 209 {
 210
 211         if (keepmuted && hardmute && dev->muted)
 212                 return;
 213
 214         if (freq < GEMTEK_LOWFREQ)
 215                 freq = GEMTEK_LOWFREQ;
 216         else if (freq > GEMTEK_HIGHFREQ)
 217                 freq = GEMTEK_HIGHFREQ;
 218
 219         dev->lastfreq = freq;
 220         dev->muted = 0;
 221
 222         gemtek_bu2614_set(dev, BU2614_PORT, 0);
 223         gemtek_bu2614_set(dev, BU2614_FMES, 0);
 224         gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode      */
 225         gemtek_bu2614_set(dev, BU2614_SWAL, 0);
 226         gemtek_bu2614_set(dev, BU2614_FMUN, 1); /* GT bit set   */
 227         gemtek_bu2614_set(dev, BU2614_TEST, 0);
 228
 229         gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_STDF_3_125_KHZ);
 230         gemtek_bu2614_set(dev, BU2614_FREQ, gemtek_convfreq(freq));
 231
 232         gemtek_bu2614_transmit(dev);
 233 }
 234
 235 /*
 236  * Set mute flag.
 237  */
 238 static void gemtek_mute(struct gemtek_device *dev)
 239 {
 240         int i;
 241         dev->muted = 1;
 242
 243         if (hardmute) {
 244                 /* Turn off PLL, disable data output */
 245                 gemtek_bu2614_set(dev, BU2614_PORT, 0);
 246                 gemtek_bu2614_set(dev, BU2614_FMES, 0); /* CT bit off   */
 247                 gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode      */
 248                 gemtek_bu2614_set(dev, BU2614_SWAL, 0);
 249                 gemtek_bu2614_set(dev, BU2614_FMUN, 0); /* GT bit off   */
 250                 gemtek_bu2614_set(dev, BU2614_TEST, 0);
 251                 gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_PLL_OFF);
 252                 gemtek_bu2614_set(dev, BU2614_FREQ, 0);
 253                 gemtek_bu2614_transmit(dev);
 254         } else {
 255                 spin_lock(&lock);
 256
 257                 /* Read bus contents (CE, CK and DA). */
 258                 i = inb_p(io);
 259                 /* Write it back with mute flag set. */
 260                 outb_p((i >> 5) | GEMTEK_MT, io);
 261                 udelay(SHORT_DELAY);
 262
 263                 spin_unlock(&lock);
 264         }
 265 }
 266
 267 /*
 268  * Unset mute flag.
 269  */
 270 static void gemtek_unmute(struct gemtek_device *dev)
 271 {
 272         int i;
 273         dev->muted = 0;
 274
 275         if (hardmute) {
 276                 /* Turn PLL back on. */
 277                 gemtek_setfreq(dev, dev->lastfreq);
 278         } else {
 279                 spin_lock(&lock);
 280
 281                 i = inb_p(io);
 282                 outb_p(i >> 5, io);
 283                 udelay(SHORT_DELAY);
 284
 285                 spin_unlock(&lock);
 286         }
 287 }
 288
 289 /*
 290  * Get signal strength (= stereo status).
 291  */
 292 static inline int gemtek_getsigstr(void)
 293 {
 294         return inb_p(io) & GEMTEK_NS ? 0 : 1;
 295 }
 296
 297 /*
 298  * Check if requested card acts like GemTek Radio card.
 299  */
 300 static int gemtek_verify(int port)
 301 {
 302         static int verified = -1;
 303         int i, q;
 304
 305         if (verified == port)
 306                 return 1;
 307
 308         spin_lock(&lock);
 309
 310         q = inb_p(port);        /* Read bus contents before probing. */
 311         /* Try to turn on CE, CK and DA respectively and check if card responds
 312            properly. */
 313         for (i = 0; i < 3; ++i) {
 314                 outb_p(1 << i, port);
 315                 udelay(SHORT_DELAY);
 316
 317                 if ((inb_p(port) & (~GEMTEK_NS)) != (0x17 | (1 << (i + 5)))) {
 318                         spin_unlock(&lock);
 319                         return 0;
 320                 }
 321         }
 322         outb_p(q >> 5, port);   /* Write bus contents back. */
 323         udelay(SHORT_DELAY);
 324
 325         spin_unlock(&lock);
 326         verified = port;
 327
 328         return 1;
 329 }
 330
 331 /*
 332  * Automatic probing for card.
 333  */
 334 static int gemtek_probe(void)
 335 {
 336         int ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
 337         int i;
 338
 339         if (!probe) {
 340                 printk(KERN_INFO "Automatic device probing disabled.\n");
 341                 return -1;
 342         }
 343
 344         printk(KERN_INFO "Automatic device probing enabled.\n");
 345
 346         for (i = 0; i < ARRAY_SIZE(ioports); ++i) {
 347                 printk(KERN_INFO "Trying I/O port 0x%x...\n", ioports[i]);
 348
 349                 if (!request_region(ioports[i], 1, "gemtek-probe")) {
 350                         printk(KERN_WARNING "I/O port 0x%x busy!\n",
 351                                ioports[i]);
 352                         continue;
 353                 }
 354
 355                 if (gemtek_verify(ioports[i])) {
 356                         printk(KERN_INFO "Card found from I/O port "
 357                                "0x%x!\n", ioports[i]);
 358
 359                         release_region(ioports[i], 1);
 360
 361                         io = ioports[i];
 362                         return io;
 363                 }
 364
 365                 release_region(ioports[i], 1);
 366         }
 367
 368         printk(KERN_ERR "Automatic probing failed!\n");
 369
 370         return -1;
 371 }
 372
 373 /*
 374  * Video 4 Linux stuff.
 375  */
 376
 377 static struct v4l2_queryctrl radio_qctrl[] = {
 378         {
 379                 .id = V4L2_CID_AUDIO_MUTE,
 380                 .name = "Mute",
 381                 .minimum = 0,
 382                 .maximum = 1,
 383                 .default_value = 1,
 384                 .type = V4L2_CTRL_TYPE_BOOLEAN,
 385         }, {
 386                 .id = V4L2_CID_AUDIO_VOLUME,
 387                 .name = "Volume",
 388                 .minimum = 0,
 389                 .maximum = 65535,
 390                 .step = 65535,
 391                 .default_value = 0xff,
 392                 .type = V4L2_CTRL_TYPE_INTEGER,
 393         }
 394 };
 395
 396 static const struct file_operations gemtek_fops = {
 397         .owner          = THIS_MODULE,
 398         .open           = video_exclusive_open,
 399         .release        = video_exclusive_release,
 400         .ioctl          = video_ioctl2,
 401 #ifdef CONFIG_COMPAT
 402         .compat_ioctl   = v4l_compat_ioctl32,
 403 #endif
 404         .llseek         = no_llseek
 405 };
 406
 407 static int vidioc_querycap(struct file *file, void *priv,
 408                            struct v4l2_capability *v)
 409 {
 410         strlcpy(v->driver, "radio-gemtek", sizeof(v->driver));
 411         strlcpy(v->card, "GemTek", sizeof(v->card));
 412         sprintf(v->bus_info, "ISA");
 413         v->version = RADIO_VERSION;
 414         v->capabilities = V4L2_CAP_TUNER;
 415         return 0;
 416 }
 417
 418 static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
 419 {
 420         if (v->index > 0)
 421                 return -EINVAL;
 422
 423         strcpy(v->name, "FM");
 424         v->type = V4L2_TUNER_RADIO;
 425         v->rangelow = GEMTEK_LOWFREQ;
 426         v->rangehigh = GEMTEK_HIGHFREQ;
 427         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 428         v->signal = 0xffff * gemtek_getsigstr();
 429         if (v->signal) {
 430                 v->audmode = V4L2_TUNER_MODE_STEREO;
 431                 v->rxsubchans = V4L2_TUNER_SUB_STEREO;
 432         } else {
 433                 v->audmode = V4L2_TUNER_MODE_MONO;
 434                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 435         }
 436
 437         return 0;
 438 }
 439
 440 static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
 441 {
 442         if (v->index > 0)
 443                 return -EINVAL;
 444         return 0;
 445 }
 446
 447 static int vidioc_s_frequency(struct file *file, void *priv,
 448                               struct v4l2_frequency *f)
 449 {
 450         struct video_device *dev = video_devdata(file);
 451         struct gemtek_device *rt = dev->priv;
 452
 453         gemtek_setfreq(rt, f->frequency);
 454
 455         return 0;
 456 }
 457
 458 static int vidioc_g_frequency(struct file *file, void *priv,
 459                               struct v4l2_frequency *f)
 460 {
 461         struct video_device *dev = video_devdata(file);
 462         struct gemtek_device *rt = dev->priv;
 463
 464         f->type = V4L2_TUNER_RADIO;
 465         f->frequency = rt->lastfreq;
 466         return 0;
 467 }
 468
 469 static int vidioc_queryctrl(struct file *file, void *priv,
 470                             struct v4l2_queryctrl *qc)
 471 {
 472         int i;
 473
 474         for (i = 0; i < ARRAY_SIZE(radio_qctrl); ++i) {
 475                 if (qc->id && qc->id == radio_qctrl[i].id) {
 476                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 477                         return 0;
 478                 }
 479         }
 480         return -EINVAL;
 481 }
 482
 483 static int vidioc_g_ctrl(struct file *file, void *priv,
 484                          struct v4l2_control *ctrl)
 485 {
 486         struct video_device *dev = video_devdata(file);
 487         struct gemtek_device *rt = dev->priv;
 488
 489         switch (ctrl->id) {
 490         case V4L2_CID_AUDIO_MUTE:
 491                 ctrl->value = rt->muted;
 492                 return 0;
 493         case V4L2_CID_AUDIO_VOLUME:
 494                 if (rt->muted)
 495                         ctrl->value = 0;
 496                 else
 497                         ctrl->value = 65535;
 498                 return 0;
 499         }
 500         return -EINVAL;
 501 }
 502
 503 static int vidioc_s_ctrl(struct file *file, void *priv,
 504                          struct v4l2_control *ctrl)
 505 {
 506         struct video_device *dev = video_devdata(file);
 507         struct gemtek_device *rt = dev->priv;
 508
 509         switch (ctrl->id) {
 510         case V4L2_CID_AUDIO_MUTE:
 511                 if (ctrl->value)
 512                         gemtek_mute(rt);
 513                 else
 514                         gemtek_unmute(rt);
 515                 return 0;
 516         case V4L2_CID_AUDIO_VOLUME:
 517                 if (ctrl->value)
 518                         gemtek_unmute(rt);
 519                 else
 520                         gemtek_mute(rt);
 521                 return 0;
 522         }
 523         return -EINVAL;
 524 }
 525
 526 static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
 527 {
 528         if (a->index > 1)
 529                 return -EINVAL;
 530
 531         strcpy(a->name, "Radio");
 532         a->capability = V4L2_AUDCAP_STEREO;
 533         return 0;
 534 }
 535
 536 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 537 {
 538         *i = 0;
 539         return 0;
 540 }
 541
 542 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 543 {
 544         if (i != 0)
 545                 return -EINVAL;
 546         return 0;
 547 }
 548
 549 static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
 550 {
 551         if (a->index != 0)
 552                 return -EINVAL;
 553         return 0;
 554 }
 555
 556 static const struct v4l2_ioctl_ops gemtek_ioctl_ops = {
 557         .vidioc_querycap        = vidioc_querycap,
 558         .vidioc_g_tuner         = vidioc_g_tuner,
 559         .vidioc_s_tuner         = vidioc_s_tuner,
 560         .vidioc_g_audio         = vidioc_g_audio,
 561         .vidioc_s_audio         = vidioc_s_audio,
 562         .vidioc_g_input         = vidioc_g_input,
 563         .vidioc_s_input         = vidioc_s_input,
 564         .vidioc_g_frequency     = vidioc_g_frequency,
 565         .vidioc_s_frequency     = vidioc_s_frequency,
 566         .vidioc_queryctrl       = vidioc_queryctrl,
 567         .vidioc_g_ctrl          = vidioc_g_ctrl,
 568         .vidioc_s_ctrl          = vidioc_s_ctrl
 569 };
 570
 571 static struct video_device gemtek_radio = {
 572         .name                   = "GemTek Radio card",
 573         .fops                   = &gemtek_fops,
 574         .ioctl_ops              = &gemtek_ioctl_ops,
 575 };
 576
 577 /*
 578  * Initialization / cleanup related stuff.
 579  */
 580
 581 /*
 582  * Initilize card.
 583  */
 584 static int __init gemtek_init(void)
 585 {
 586         printk(KERN_INFO RADIO_BANNER "\n");
 587
 588         spin_lock_init(&lock);
 589
 590         gemtek_probe();
 591         if (io) {
 592                 if (!request_region(io, 1, "gemtek")) {
 593                         printk(KERN_ERR "I/O port 0x%x already in use.\n", io);
 594                         return -EBUSY;
 595                 }
 596
 597                 if (!gemtek_verify(io))
 598                         printk(KERN_WARNING "Card at I/O port 0x%x does not "
 599                                "respond properly, check your "
 600                                "configuration.\n", io);
 601                 else
 602                         printk(KERN_INFO "Using I/O port 0x%x.\n", io);
 603         } else if (probe) {
 604                 printk(KERN_ERR "Automatic probing failed and no "
 605                        "fixed I/O port defined.\n");
 606                 return -ENODEV;
 607         } else {
 608                 printk(KERN_ERR "Automatic probing disabled but no fixed "
 609                        "I/O port defined.");
 610                 return -EINVAL;
 611         }
 612
 613         gemtek_radio.priv = &gemtek_unit;
 614
 615         if (video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 616                 release_region(io, 1);
 617                 return -EBUSY;
 618         }
 619
 620         /* Set defaults */
 621         gemtek_unit.lastfreq = GEMTEK_LOWFREQ;
 622         gemtek_unit.bu2614data = 0;
 623
 624         if (initmute)
 625                 gemtek_mute(&gemtek_unit);
 626
 627         return 0;
 628 }
 629
 630 /*
 631  * Module cleanup
 632  */
 633 static void __exit gemtek_exit(void)
 634 {
 635         if (shutdown) {
 636                 hardmute = 1;   /* Turn off PLL */
 637                 gemtek_mute(&gemtek_unit);
 638         } else {
 639                 printk(KERN_INFO "Module unloaded but card not muted!\n");
 640         }
 641
 642         video_unregister_device(&gemtek_radio);
 643         release_region(io, 1);
 644 }
 645
 646 module_init(gemtek_init);
 647 module_exit(gemtek_exit);