LXR linux/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
  38MODULE_AUTHOR("Jonas Munsin, Pekka Seppänen <pexu@kapsi.fi>");
  39MODULE_DESCRIPTION("A driver for the GemTek Radio card.");
  40MODULE_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
  53static int io           = CONFIG_RADIO_GEMTEK_PORT;
  54static int probe        = CONFIG_RADIO_GEMTEK_PROBE;
  55static int hardmute;
  56static int shutdown     = 1;
  57static int keepmuted    = 1;
  58static int initmute     = 1;
  59static int radio_nr     = -1;
  60static unsigned long in_use;
  61
  62module_param(io, int, 0444);
  63MODULE_PARM_DESC(io, "Force I/O port for the GemTek Radio card if automatic "
  64         "probing is disabled or fails. The most common I/O ports are: 0x20c "
  65         "0x30c, 0x24c or 0x34c (0x20c, 0x248 and 0x28c have been reported to "
  66         "work for the combined sound/radiocard).");
  67
  68module_param(probe, bool, 0444);
  69MODULE_PARM_DESC(probe, "Enable automatic device probing. Note: only the most "
  70        "common I/O ports used by the card are probed.");
  71
  72module_param(hardmute, bool, 0644);
  73MODULE_PARM_DESC(hardmute, "Enable `hard muting' by shutting down PLL, may "
  74         "reduce static noise.");
  75
  76module_param(shutdown, bool, 0644);
  77MODULE_PARM_DESC(shutdown, "Enable shutting down PLL and muting line when "
  78         "module is unloaded.");
  79
  80module_param(keepmuted, bool, 0644);
  81MODULE_PARM_DESC(keepmuted, "Keep card muted even when frequency is changed.");
  82
  83module_param(initmute, bool, 0444);
  84MODULE_PARM_DESC(initmute, "Mute card when module is loaded.");
  85
  86module_param(radio_nr, int, 0444);
  87
  88/*
  89 * Functions for controlling the card.
  90 */
  91#define GEMTEK_LOWFREQ  (87*16000)
  92#define GEMTEK_HIGHFREQ (108*16000)
  93
  94/*
  95 * Frequency calculation constants.  Intermediate frequency 10.52 MHz (nominal
  96 * value 10.7 MHz), reference divisor 6.39 kHz (nominal 6.25 kHz).
  97 */
  98#define FSCALE          8
  99#define IF_OFFSET       ((unsigned int)(10.52 * 16000 * (1<<FSCALE)))
 100#define REF_FREQ        ((unsigned int)(6.39 * 16 * (1<<FSCALE)))
 101
 102#define GEMTEK_CK               0x01    /* Clock signal                 */
 103#define GEMTEK_DA               0x02    /* Serial data                  */
 104#define GEMTEK_CE               0x04    /* Chip enable                  */
 105#define GEMTEK_NS               0x08    /* No signal                    */
 106#define GEMTEK_MT               0x10    /* Line mute                    */
 107#define GEMTEK_STDF_3_125_KHZ   0x01    /* Standard frequency 3.125 kHz */
 108#define GEMTEK_PLL_OFF          0x07    /* PLL off                      */
 109
 110#define BU2614_BUS_SIZE 32      /* BU2614 / BU2614FS bus size           */
 111
 112#define SHORT_DELAY 5           /* usec */
 113#define LONG_DELAY 75           /* usec */
 114
 115struct gemtek_device {
 116        unsigned long lastfreq;
 117        int muted;
 118        u32 bu2614data;
 119};
 120
 121#define BU2614_FREQ_BITS        16 /* D0..D15, Frequency data           */
 122#define BU2614_PORT_BITS        3 /* P0..P2, Output port control data   */
 123#define BU2614_VOID_BITS        4 /* unused                             */
 124#define BU2614_FMES_BITS        1 /* CT, Frequency measurement beginning data */
 125#define BU2614_STDF_BITS        3 /* R0..R2, Standard frequency data    */
 126#define BU2614_SWIN_BITS        1 /* S, Switch between FMIN / AMIN      */
 127#define BU2614_SWAL_BITS        1 /* PS, Swallow counter division (AMIN only)*/
 128#define BU2614_VOID2_BITS       1 /* unused                             */
 129#define BU2614_FMUN_BITS        1 /* GT, Frequency measurement time & unlock */
 130#define BU2614_TEST_BITS        1 /* TS, Test data is input             */
 131
 132#define BU2614_FREQ_SHIFT       0
 133#define BU2614_PORT_SHIFT       (BU2614_FREQ_BITS + BU2614_FREQ_SHIFT)
 134#define BU2614_VOID_SHIFT       (BU2614_PORT_BITS + BU2614_PORT_SHIFT)
 135#define BU2614_FMES_SHIFT       (BU2614_VOID_BITS + BU2614_VOID_SHIFT)
 136#define BU2614_STDF_SHIFT       (BU2614_FMES_BITS + BU2614_FMES_SHIFT)
 137#define BU2614_SWIN_SHIFT       (BU2614_STDF_BITS + BU2614_STDF_SHIFT)
 138#define BU2614_SWAL_SHIFT       (BU2614_SWIN_BITS + BU2614_SWIN_SHIFT)
 139#define BU2614_VOID2_SHIFT      (BU2614_SWAL_BITS + BU2614_SWAL_SHIFT)
 140#define BU2614_FMUN_SHIFT       (BU2614_VOID2_BITS + BU2614_VOID2_SHIFT)
 141#define BU2614_TEST_SHIFT       (BU2614_FMUN_BITS + BU2614_FMUN_SHIFT)
 142
 143#define MKMASK(field)   (((1<<BU2614_##field##_BITS) - 1) << \
 144                        BU2614_##field##_SHIFT)
 145#define BU2614_PORT_MASK        MKMASK(PORT)
 146#define BU2614_FREQ_MASK        MKMASK(FREQ)
 147#define BU2614_VOID_MASK        MKMASK(VOID)
 148#define BU2614_FMES_MASK        MKMASK(FMES)
 149#define BU2614_STDF_MASK        MKMASK(STDF)
 150#define BU2614_SWIN_MASK        MKMASK(SWIN)
 151#define BU2614_SWAL_MASK        MKMASK(SWAL)
 152#define BU2614_VOID2_MASK       MKMASK(VOID2)
 153#define BU2614_FMUN_MASK        MKMASK(FMUN)
 154#define BU2614_TEST_MASK        MKMASK(TEST)
 155
 156static struct gemtek_device gemtek_unit;
 157
 158static spinlock_t lock;
 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 */
 169static void gemtek_bu2614_transmit(struct gemtek_device *dev)
 170{
 171        int i, bit, q, mute;
 172
 173        spin_lock(&lock);
 174
 175        mute = dev->muted ? GEMTEK_MT : 0x00;
 176
 177        outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
 178        udelay(SHORT_DELAY);
 179        outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
 180        udelay(LONG_DELAY);
 181
 182        for (i = 0, q = dev->bu2614data; i < 32; i++, q >>= 1) {
 183            bit = (q & 1) ? GEMTEK_DA : 0;
 184            outb_p(mute | GEMTEK_CE | bit, io);
 185            udelay(SHORT_DELAY);
 186            outb_p(mute | GEMTEK_CE | bit | GEMTEK_CK, io);
 187            udelay(SHORT_DELAY);
 188        }
 189
 190        outb_p(mute | GEMTEK_DA | GEMTEK_CK, io);
 191        udelay(SHORT_DELAY);
 192        outb_p(mute | GEMTEK_CE | GEMTEK_DA | GEMTEK_CK, io);
 193        udelay(LONG_DELAY);
 194
 195        spin_unlock(&lock);
 196}
 197
 198/*
 199 * Calculate divisor from FM-frequency for BU2614FS (3.125 KHz STDF expected).
 200 */
 201static 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 */
 209static void gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
 210{
 211
 212        if (keepmuted && hardmute && dev->muted)
 213                return;
 214
 215        if (freq < GEMTEK_LOWFREQ)
 216                freq = GEMTEK_LOWFREQ;
 217        else if (freq > GEMTEK_HIGHFREQ)
 218                freq = GEMTEK_HIGHFREQ;
 219
 220        dev->lastfreq = freq;
 221        dev->muted = 0;
 222
 223        gemtek_bu2614_set(dev, BU2614_PORT, 0);
 224        gemtek_bu2614_set(dev, BU2614_FMES, 0);
 225        gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode      */
 226        gemtek_bu2614_set(dev, BU2614_SWAL, 0);
 227        gemtek_bu2614_set(dev, BU2614_FMUN, 1); /* GT bit set   */
 228        gemtek_bu2614_set(dev, BU2614_TEST, 0);
 229
 230        gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_STDF_3_125_KHZ);
 231        gemtek_bu2614_set(dev, BU2614_FREQ, gemtek_convfreq(freq));
 232
 233        gemtek_bu2614_transmit(dev);
 234}
 235
 236/*
 237 * Set mute flag.
 238 */
 239static void gemtek_mute(struct gemtek_device *dev)
 240{
 241        int i;
 242        dev->muted = 1;
 243
 244        if (hardmute) {
 245                /* Turn off PLL, disable data output */
 246                gemtek_bu2614_set(dev, BU2614_PORT, 0);
 247                gemtek_bu2614_set(dev, BU2614_FMES, 0); /* CT bit off   */
 248                gemtek_bu2614_set(dev, BU2614_SWIN, 0); /* FM-mode      */
 249                gemtek_bu2614_set(dev, BU2614_SWAL, 0);
 250                gemtek_bu2614_set(dev, BU2614_FMUN, 0); /* GT bit off   */
 251                gemtek_bu2614_set(dev, BU2614_TEST, 0);
 252                gemtek_bu2614_set(dev, BU2614_STDF, GEMTEK_PLL_OFF);
 253                gemtek_bu2614_set(dev, BU2614_FREQ, 0);
 254                gemtek_bu2614_transmit(dev);
 255        } else {
 256                spin_lock(&lock);
 257
 258                /* Read bus contents (CE, CK and DA). */
 259                i = inb_p(io);
 260                /* Write it back with mute flag set. */
 261                outb_p((i >> 5) | GEMTEK_MT, io);
 262                udelay(SHORT_DELAY);
 263
 264                spin_unlock(&lock);
 265        }
 266}
 267
 268/*
 269 * Unset mute flag.
 270 */
 271static void gemtek_unmute(struct gemtek_device *dev)
 272{
 273        int i;
 274        dev->muted = 0;
 275
 276        if (hardmute) {
 277                /* Turn PLL back on. */
 278                gemtek_setfreq(dev, dev->lastfreq);
 279        } else {
 280                spin_lock(&lock);
 281
 282                i = inb_p(io);
 283                outb_p(i >> 5, io);
 284                udelay(SHORT_DELAY);
 285
 286                spin_unlock(&lock);
 287        }
 288}
 289
 290/*
 291 * Get signal strength (= stereo status).
 292 */
 293static inline int gemtek_getsigstr(void)
 294{
 295        return inb_p(io) & GEMTEK_NS ? 0 : 1;
 296}
 297
 298/*
 299 * Check if requested card acts like GemTek Radio card.
 300 */
 301static int gemtek_verify(int port)
 302{
 303        static int verified = -1;
 304        int i, q;
 305
 306        if (verified == port)
 307                return 1;
 308
 309        spin_lock(&lock);
 310
 311        q = inb_p(port);        /* Read bus contents before probing. */
 312        /* Try to turn on CE, CK and DA respectively and check if card responds
 313           properly. */
 314        for (i = 0; i < 3; ++i) {
 315                outb_p(1 << i, port);
 316                udelay(SHORT_DELAY);
 317
 318                if ((inb_p(port) & (~GEMTEK_NS)) != (0x17 | (1 << (i + 5)))) {
 319                        spin_unlock(&lock);
 320                        return 0;
 321                }
 322        }
 323        outb_p(q >> 5, port);   /* Write bus contents back. */
 324        udelay(SHORT_DELAY);
 325
 326        spin_unlock(&lock);
 327        verified = port;
 328
 329        return 1;
 330}
 331
 332/*
 333 * Automatic probing for card.
 334 */
 335static int gemtek_probe(void)
 336{
 337        int ioports[] = { 0x20c, 0x30c, 0x24c, 0x34c, 0x248, 0x28c };
 338        int i;
 339
 340        if (!probe) {
 341                printk(KERN_INFO "Automatic device probing disabled.\n");
 342                return -1;
 343        }
 344
 345        printk(KERN_INFO "Automatic device probing enabled.\n");
 346
 347        for (i = 0; i < ARRAY_SIZE(ioports); ++i) {
 348                printk(KERN_INFO "Trying I/O port 0x%x...\n", ioports[i]);
 349
 350                if (!request_region(ioports[i], 1, "gemtek-probe")) {
 351                        printk(KERN_WARNING "I/O port 0x%x busy!\n",
 352                               ioports[i]);
 353                        continue;
 354                }
 355
 356                if (gemtek_verify(ioports[i])) {
 357                        printk(KERN_INFO "Card found from I/O port "
 358                               "0x%x!\n", ioports[i]);
 359
 360                        release_region(ioports[i], 1);
 361
 362                        io = ioports[i];
 363                        return io;
 364                }
 365
 366                release_region(ioports[i], 1);
 367        }
 368
 369        printk(KERN_ERR "Automatic probing failed!\n");
 370
 371        return -1;
 372}
 373
 374/*
 375 * Video 4 Linux stuff.
 376 */
 377
 378static struct v4l2_queryctrl radio_qctrl[] = {
 379        {
 380                .id = V4L2_CID_AUDIO_MUTE,
 381                .name = "Mute",
 382                .minimum = 0,
 383                .maximum = 1,
 384                .default_value = 1,
 385                .type = V4L2_CTRL_TYPE_BOOLEAN,
 386        }, {
 387                .id = V4L2_CID_AUDIO_VOLUME,
 388                .name = "Volume",
 389                .minimum = 0,
 390                .maximum = 65535,
 391                .step = 65535,
 392                .default_value = 0xff,
 393                .type = V4L2_CTRL_TYPE_INTEGER,
 394        }
 395};
 396
 397static int gemtek_exclusive_open(struct inode *inode, struct file *file)
 398{
 399        return test_and_set_bit(0, &in_use) ? -EBUSY : 0;
 400}
 401
 402static int gemtek_exclusive_release(struct inode *inode, struct file *file)
 403{
 404        clear_bit(0, &in_use);
 405        return 0;
 406}
 407
 408static const struct file_operations gemtek_fops = {
 409        .owner          = THIS_MODULE,
 410        .open           = gemtek_exclusive_open,
 411        .release        = gemtek_exclusive_release,
 412        .ioctl          = video_ioctl2,
 413#ifdef CONFIG_COMPAT
 414        .compat_ioctl   = v4l_compat_ioctl32,
 415#endif
 416        .llseek         = no_llseek
 417};
 418
 419static int vidioc_querycap(struct file *file, void *priv,
 420                           struct v4l2_capability *v)
 421{
 422        strlcpy(v->driver, "radio-gemtek", sizeof(v->driver));
 423        strlcpy(v->card, "GemTek", sizeof(v->card));
 424        sprintf(v->bus_info, "ISA");
 425        v->version = RADIO_VERSION;
 426        v->capabilities = V4L2_CAP_TUNER;
 427        return 0;
 428}
 429
 430static int vidioc_g_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
 431{
 432        if (v->index > 0)
 433                return -EINVAL;
 434
 435        strcpy(v->name, "FM");
 436        v->type = V4L2_TUNER_RADIO;
 437        v->rangelow = GEMTEK_LOWFREQ;
 438        v->rangehigh = GEMTEK_HIGHFREQ;
 439        v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 440        v->signal = 0xffff * gemtek_getsigstr();
 441        if (v->signal) {
 442                v->audmode = V4L2_TUNER_MODE_STEREO;
 443                v->rxsubchans = V4L2_TUNER_SUB_STEREO;
 444        } else {
 445                v->audmode = V4L2_TUNER_MODE_MONO;
 446                v->rxsubchans = V4L2_TUNER_SUB_MONO;
 447        }
 448
 449        return 0;
 450}
 451
 452static int vidioc_s_tuner(struct file *file, void *priv, struct v4l2_tuner *v)
 453{
 454        if (v->index > 0)
 455                return -EINVAL;
 456        return 0;
 457}
 458
 459static int vidioc_s_frequency(struct file *file, void *priv,
 460                              struct v4l2_frequency *f)
 461{
 462        struct gemtek_device *rt = video_drvdata(file);
 463
 464        gemtek_setfreq(rt, f->frequency);
 465
 466        return 0;
 467}
 468
 469static int vidioc_g_frequency(struct file *file, void *priv,
 470                              struct v4l2_frequency *f)
 471{
 472        struct gemtek_device *rt = video_drvdata(file);
 473
 474        f->type = V4L2_TUNER_RADIO;
 475        f->frequency = rt->lastfreq;
 476        return 0;
 477}
 478
 479static int vidioc_queryctrl(struct file *file, void *priv,
 480                            struct v4l2_queryctrl *qc)
 481{
 482        int i;
 483
 484        for (i = 0; i < ARRAY_SIZE(radio_qctrl); ++i) {
 485                if (qc->id && qc->id == radio_qctrl[i].id) {
 486                        memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 487                        return 0;
 488                }
 489        }
 490        return -EINVAL;
 491}
 492
 493static int vidioc_g_ctrl(struct file *file, void *priv,
 494                         struct v4l2_control *ctrl)
 495{
 496        struct gemtek_device *rt = video_drvdata(file);
 497
 498        switch (ctrl->id) {
 499        case V4L2_CID_AUDIO_MUTE:
 500                ctrl->value = rt->muted;
 501                return 0;
 502        case V4L2_CID_AUDIO_VOLUME:
 503                if (rt->muted)
 504                        ctrl->value = 0;
 505                else
 506                        ctrl->value = 65535;
 507                return 0;
 508        }
 509        return -EINVAL;
 510}
 511
 512static int vidioc_s_ctrl(struct file *file, void *priv,
 513                         struct v4l2_control *ctrl)
 514{
 515        struct gemtek_device *rt = video_drvdata(file);
 516
 517        switch (ctrl->id) {
 518        case V4L2_CID_AUDIO_MUTE:
 519                if (ctrl->value)
 520                        gemtek_mute(rt);
 521                else
 522                        gemtek_unmute(rt);
 523                return 0;
 524        case V4L2_CID_AUDIO_VOLUME:
 525                if (ctrl->value)
 526                        gemtek_unmute(rt);
 527                else
 528                        gemtek_mute(rt);
 529                return 0;
 530        }
 531        return -EINVAL;
 532}
 533
 534static int vidioc_g_audio(struct file *file, void *priv, struct v4l2_audio *a)
 535{
 536        if (a->index > 1)
 537                return -EINVAL;
 538
 539        strcpy(a->name, "Radio");
 540        a->capability = V4L2_AUDCAP_STEREO;
 541        return 0;
 542}
 543
 544static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 545{
 546        *i = 0;
 547        return 0;
 548}
 549
 550static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 551{
 552        if (i != 0)
 553                return -EINVAL;
 554        return 0;
 555}
 556
 557static int vidioc_s_audio(struct file *file, void *priv, struct v4l2_audio *a)
 558{
 559        if (a->index != 0)
 560                return -EINVAL;
 561        return 0;
 562}
 563
 564static const struct v4l2_ioctl_ops gemtek_ioctl_ops = {
 565        .vidioc_querycap        = vidioc_querycap,
 566        .vidioc_g_tuner         = vidioc_g_tuner,
 567        .vidioc_s_tuner         = vidioc_s_tuner,
 568        .vidioc_g_audio         = vidioc_g_audio,
 569        .vidioc_s_audio         = vidioc_s_audio,
 570        .vidioc_g_input         = vidioc_g_input,
 571        .vidioc_s_input         = vidioc_s_input,
 572        .vidioc_g_frequency     = vidioc_g_frequency,
 573        .vidioc_s_frequency     = vidioc_s_frequency,
 574        .vidioc_queryctrl       = vidioc_queryctrl,
 575        .vidioc_g_ctrl          = vidioc_g_ctrl,
 576        .vidioc_s_ctrl          = vidioc_s_ctrl
 577};
 578
 579static struct video_device gemtek_radio = {
 580        .name           = "GemTek Radio card",
 581        .fops           = &gemtek_fops,
 582        .ioctl_ops      = &gemtek_ioctl_ops,
 583        .release        = video_device_release_empty,
 584};
 585
 586/*
 587 * Initialization / cleanup related stuff.
 588 */
 589
 590/*
 591 * Initilize card.
 592 */
 593static int __init gemtek_init(void)
 594{
 595        printk(KERN_INFO RADIO_BANNER "\n");
 596
 597        spin_lock_init(&lock);
 598
 599        gemtek_probe();
 600        if (io) {
 601                if (!request_region(io, 1, "gemtek")) {
 602                        printk(KERN_ERR "I/O port 0x%x already in use.\n", io);
 603                        return -EBUSY;
 604                }
 605
 606                if (!gemtek_verify(io))
 607                        printk(KERN_WARNING "Card at I/O port 0x%x does not "
 608                               "respond properly, check your "
 609                               "configuration.\n", io);
 610                else
 611                        printk(KERN_INFO "Using I/O port 0x%x.\n", io);
 612        } else if (probe) {
 613                printk(KERN_ERR "Automatic probing failed and no "
 614                       "fixed I/O port defined.\n");
 615                return -ENODEV;
 616        } else {
 617                printk(KERN_ERR "Automatic probing disabled but no fixed "
 618                       "I/O port defined.");
 619                return -EINVAL;
 620        }
 621
 622        video_set_drvdata(&gemtek_radio, &gemtek_unit);
 623
 624        if (video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 625                release_region(io, 1);
 626                return -EBUSY;
 627        }
 628
 629        /* Set defaults */
 630        gemtek_unit.lastfreq = GEMTEK_LOWFREQ;
 631        gemtek_unit.bu2614data = 0;
 632
 633        if (initmute)
 634                gemtek_mute(&gemtek_unit);
 635
 636        return 0;
 637}
 638
 639/*
 640 * Module cleanup
 641 */
 642static void __exit gemtek_exit(void)
 643{
 644        if (shutdown) {
 645                hardmute = 1;   /* Turn off PLL */
 646                gemtek_mute(&gemtek_unit);
 647        } else {
 648                printk(KERN_INFO "Module unloaded but card not muted!\n");
 649        }
 650
 651        video_unregister_device(&gemtek_radio);
 652        release_region(io, 1);
 653}
 654
 655module_init(gemtek_init);
 656module_exit(gemtek_exit);
 657