drivers/media/radio/radio-tea5761.c

   1 /*
   2  * drivers/media/radio/radio-tea5761.c
   3  *
   4  * Copyright (C) 2005 Nokia Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  19  */
  20 #include <linux/module.h>
  21 #include <linux/version.h>
  22 #include <linux/init.h>
  23 #include <linux/i2c.h>
  24 #include <linux/delay.h>
  25 #include <media/v4l2-common.h>
  26 #include <asm/arch/gpio.h>
  27 #include <asm/arch/board.h>
  28
  29 #define DRIVER_NAME "tea5761"
  30
  31 #define TEA5761_VERSION         KERNEL_VERSION(0, 0, 1)
  32
  33 #define TEA5761_I2C_ADDR        0x10
  34
  35 #define TEA5761_MANID           0x002b
  36 #define TEA5761_CHIPID          0x5761
  37
  38 #define TEA5761_INTREG_BLMSK    0x0001
  39 #define TEA5761_INTREG_FRRMSK   0x0002
  40 #define TEA5761_INTREG_LEVMSK   0x0008
  41 #define TEA5761_INTREG_IFMSK    0x0010
  42 #define TEA5761_INTREG_BLMFLAG  0x0100
  43 #define TEA5761_INTREG_FRRFLAG  0x0200
  44 #define TEA5761_INTREG_LEVFLAG  0x0800
  45 #define TEA5761_INTREG_IFFLAG   0x1000
  46
  47 #define TEA5761_FRQSET_SUD      0x8000
  48 #define TEA5761_FRQSET_SM       0x4000
  49
  50 #define TEA5761_TNCTRL_PUPD0    0x4000
  51 #define TEA5761_TNCTRL_BLIM     0x2000
  52 #define TEA5761_TNCTRL_SWPM     0x1000
  53 #define TEA5761_TNCTRL_IFCTC    0x0800
  54 #define TEA5761_TNCTRL_AFM      0x0400
  55 #define TEA5761_TNCTRL_SMUTE    0x0200
  56 #define TEA5761_TNCTRL_SNC      0x0100
  57 #define TEA5761_TNCTRL_MU       0x0080
  58 #define TEA5761_TNCTRL_SSL1     0x0040
  59 #define TEA5761_TNCTRL_SSL0     0x0020
  60 #define TEA5761_TNCTRL_HLSI     0x0010
  61 #define TEA5761_TNCTRL_MST      0x0008
  62 #define TEA5761_TNCTRL_SWP      0x0004
  63 #define TEA5761_TNCTRL_DTC      0x0002
  64 #define TEA5761_TNCTRL_AHLSI    0x0001
  65
  66 #define TEA5761_TUNCHK_LEVEL(x) (((x) & 0x00F0) >> 4)
  67 #define TEA5761_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)
  68 #define TEA5761_TUNCHK_TUNTO    0x0100
  69 #define TEA5761_TUNCHK_LD       0x0008
  70 #define TEA5761_TUNCHK_STEREO   0x0004
  71
  72 #define TEA5761_TESTREG_TRIGFR  0x0800
  73
  74 #define TEA5761_FREQ_LOW        87500
  75 #define TEA5761_FREQ_HIGH       108000
  76
  77 /* Probe for TEA5761 twice since the version N4B seems to be
  78  * broken and needs two probes to be found */
  79 static unsigned short normal_i2c[] = {
  80         TEA5761_I2C_ADDR, TEA5761_I2C_ADDR, I2C_CLIENT_END
  81 };
  82
  83 I2C_CLIENT_INSMOD;
  84
  85 struct tea5761_regs {
  86         u16 intreg;
  87         u16 frqset;
  88         u16 tnctrl;
  89         u16 frqchk;
  90         u16 tunchk;
  91         u16 testreg;
  92         u16 manid;
  93         u16 chipid;
  94 } __attribute__ ((packed));
  95
  96 struct tea5761_write_regs {
  97         u8 intreg;
  98         u16 frqset;
  99         u16 tnctrl;
 100         u16 testreg;
 101 } __attribute__ ((packed));
 102
 103 struct tea5761_device {
 104         struct video_device     *video_dev;
 105         struct i2c_client       *i2c_dev;
 106         struct tea5761_regs     regs;
 107         struct mutex            mutex;
 108         int                     users;
 109 };
 110
 111 static struct tea5761_device tea5761;
 112
 113 static struct i2c_driver        tea5761_driver;
 114 static int radio_nr = -1;
 115
 116 static int tea5761_read_regs(struct tea5761_device *tea)
 117 {
 118         int rc, i;
 119         u16 *p = (u16 *) &tea->regs;
 120         struct i2c_client *client = tea->i2c_dev;
 121
 122         rc = i2c_master_recv(client, (void*) &tea->regs, sizeof(tea->regs));
 123         for (i = 0; i < 8; i++) {
 124                 p[i] = __be16_to_cpu(p[i]);
 125         }
 126
 127         dev_dbg(&client->dev,
 128                 "chip state: %04x %04x %04x %04x %04x %04x %04x %04x\n",
 129                 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
 130
 131         if (rc < 0)
 132                 dev_err(&client->dev, "read\n");
 133
 134         return rc;
 135 }
 136
 137 static void tea5761_write_regs(struct tea5761_device *tea)
 138 {
 139         struct tea5761_write_regs wr;
 140         struct tea5761_regs *r = &tea->regs;
 141         struct i2c_client *client = tea->i2c_dev;
 142         u8 *p = (u8 *) r;
 143
 144         wr.intreg = r->intreg & 0xff;
 145         wr.frqset = __cpu_to_be16(r->frqset);
 146         wr.tnctrl = __cpu_to_be16(r->tnctrl);
 147         wr.testreg = __cpu_to_be16(r->testreg);
 148
 149         dev_dbg(&client->dev,
 150                 "writing state: %02x %02x %02x %02x %02x %02x %02x\n",
 151                 p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
 152         if (i2c_master_send(client, (void *) &wr, sizeof(wr)) < 0)
 153                 dev_err(&client->dev, "write\n");
 154 }
 155
 156 static void tea5761_power_up(struct tea5761_device *tea)
 157 {
 158         struct tea5761_regs *r = &tea->regs;
 159
 160         if (!(r->tnctrl & TEA5761_TNCTRL_PUPD0)) {
 161                 r->tnctrl &= ~(TEA5761_TNCTRL_AFM | TEA5761_TNCTRL_MU |
 162                                TEA5761_TNCTRL_HLSI);
 163                 r->testreg |= TEA5761_TESTREG_TRIGFR;
 164                 r->tnctrl |= TEA5761_TNCTRL_PUPD0;
 165                 return tea5761_write_regs(tea);
 166         }
 167 }
 168
 169 static void tea5761_power_down(struct tea5761_device *tea)
 170 {
 171         struct tea5761_regs *r = &tea->regs;
 172
 173         if (r->tnctrl & TEA5761_TNCTRL_PUPD0) {
 174                 r->tnctrl &= ~TEA5761_TNCTRL_PUPD0;
 175                 return tea5761_write_regs(tea);
 176         }
 177 }
 178
 179 static void tea5761_set_freq(struct tea5761_device *tea, int freq)
 180 {
 181         struct tea5761_regs *r = &tea->regs;
 182
 183         if (r->tnctrl & TEA5761_TNCTRL_HLSI)
 184                 r->frqset = (freq + 225000) / 8192;
 185         else
 186                 r->frqset = (freq - 225000) / 8192;
 187 }
 188
 189 static int tea5761_get_freq(struct tea5761_device *tea)
 190 {
 191         struct tea5761_regs *r = &tea->regs;
 192
 193         if (r->tnctrl & TEA5761_TNCTRL_HLSI)
 194                 return (r->frqchk * 8192) - 225000;
 195         else
 196                 return (r->frqchk * 8192) + 225000;
 197 }
 198
 199 static void tea5761_tune(struct tea5761_device *tea, int freq)
 200 {
 201         tea5761_set_freq(tea, freq);
 202         tea5761_write_regs(tea);
 203 }
 204
 205 static void tea5761_set_audout_mode(struct tea5761_device *tea, int audmode)
 206 {
 207         struct tea5761_regs *r = &tea->regs;
 208         int tnctrl = r->tnctrl;
 209
 210         if (audmode == V4L2_TUNER_MODE_MONO)
 211                 r->tnctrl |= TEA5761_TNCTRL_MST;
 212         else
 213                 r->tnctrl &= ~TEA5761_TNCTRL_MST;
 214         if (tnctrl != r->tnctrl)
 215                 tea5761_write_regs(tea);
 216 }
 217
 218 static int tea5761_get_audout_mode(struct tea5761_device *tea)
 219 {
 220         struct tea5761_regs *r = &tea->regs;
 221
 222         if (r->tnctrl & TEA5761_TNCTRL_MST)
 223                 return V4L2_TUNER_MODE_MONO;
 224         else
 225                 return V4L2_TUNER_MODE_STEREO;
 226 }
 227
 228 static void tea5761_mute(struct tea5761_device *tea, int on)
 229 {
 230         struct tea5761_regs *r = &tea->regs;
 231         int tnctrl = r->tnctrl;
 232
 233         if (on)
 234                 r->tnctrl |= TEA5761_TNCTRL_MU;
 235         else
 236                 r->tnctrl &= ~TEA5761_TNCTRL_MU;
 237         if (tnctrl != r->tnctrl)
 238                 tea5761_write_regs(tea);
 239 }
 240
 241 static int tea5761_is_muted(struct tea5761_device *tea)
 242 {
 243         return tea->regs.tnctrl & TEA5761_TNCTRL_MU;
 244 }
 245
 246 static int tea5761_do_ioctl(struct inode *inode, struct file *file,
 247                             unsigned int cmd, void *arg)
 248 {
 249         struct tea5761_device *tea = file->private_data;
 250         struct video_device *dev = tea->video_dev;
 251         struct i2c_client *client = tea->i2c_dev;
 252         struct tea5761_regs *r = &tea->regs;
 253
 254         union {
 255                 struct v4l2_capability c;
 256                 struct v4l2_tuner t;
 257                 struct v4l2_frequency f;
 258                 struct v4l2_queryctrl qc;
 259                 struct v4l2_control ct;
 260         } *u = arg;
 261
 262         tea5761_read_regs(tea);
 263
 264         switch (cmd) {
 265         case VIDIOC_QUERYCAP:
 266                 dev_dbg(&client->dev, "VIDIOC_QUERYCAP\n");
 267                 memset(&u->c, 0, sizeof(u->c));
 268                 strlcpy(u->c.driver, dev->dev->driver->name,
 269                         sizeof(u->c.driver));
 270                 strlcpy(u->c.card, dev->name, sizeof(u->c.card));
 271                 snprintf(u->c.bus_info, sizeof(u->c.bus_info), "I2C:%s",
 272                          dev->dev->bus_id);
 273                 u->c.version = TEA5761_VERSION;
 274                 u->c.capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 275                 break;
 276
 277         case VIDIOC_G_TUNER:
 278                 /* Only one tuner chip */
 279                 dev_dbg(&client->dev, "VIDIOC_G_TUNER\n");
 280                 if (u->t.index != 0)
 281                         return -EINVAL;
 282
 283                 memset(&u->t, 0, sizeof(u->t));
 284                 u->t.type = V4L2_TUNER_RADIO;
 285                 strlcpy(u->t.name, "FM", sizeof(u->t.name));
 286                 /* Freq in 62.5Hz units */
 287                 u->t.rangelow = TEA5761_FREQ_LOW * 16;
 288                 u->t.rangehigh = TEA5761_FREQ_HIGH * 16;
 289                 u->t.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 290                 if (r->tunchk & TEA5761_TUNCHK_STEREO)
 291                         u->t.rxsubchans = V4L2_TUNER_SUB_STEREO;
 292                 u->t.audmode = tea5761_get_audout_mode(tea);
 293                 u->t.signal = TEA5761_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;
 294                 u->t.afc = TEA5761_TUNCHK_IFCNT(r->tunchk);
 295                 break;
 296
 297         case VIDIOC_S_TUNER:
 298                 /* Only tuner nro 0 can be selected. */
 299                 dev_dbg(&client->dev, "VIDIOC_S_TUNER\n");
 300                 if (u->t.index != 0)
 301                         return -EINVAL;
 302                 tea5761_set_audout_mode(tea, u->t.audmode);
 303                 break;
 304
 305         case VIDIOC_G_FREQUENCY:
 306                 dev_dbg(&client->dev, "VIDIOC_G_FREQUENCY\n");
 307                 memset(&u->f, 0, sizeof(u->f));
 308                 u->f.type = V4L2_TUNER_RADIO;
 309                 if (r->tnctrl & TEA5761_TNCTRL_PUPD0)
 310                         u->f.frequency = (tea5761_get_freq(tea) * 2) / 125;
 311                 else
 312                         u->f.frequency = 0;
 313                 break;
 314
 315         case VIDIOC_S_FREQUENCY:
 316                 dev_dbg(&client->dev, "VIDIOC_S_FREQUENCY %u\n",
 317                         u->f.frequency);
 318                 if (u->f.tuner != 0)
 319                         return -EINVAL;
 320                 if (u->f.frequency == 0) {
 321                         /* We special case this as a power down
 322                          * control. */
 323                         tea5761_power_down(tea);
 324                         break;
 325                 }
 326                 if (u->f.frequency < 16 * TEA5761_FREQ_LOW)
 327                         return -EINVAL;
 328                 if (u->f.frequency > 16 * TEA5761_FREQ_HIGH)
 329                         return -EINVAL;
 330
 331                 tea5761_power_up(tea);
 332                 tea5761_tune(tea, (u->f.frequency * 125) / 2);
 333                 break;
 334
 335         case VIDIOC_QUERYCTRL:
 336                 dev_dbg(&client->dev, "VIDIOC_QUERYCTRL %d\n", u->qc.id);
 337                 if (u->qc.id != V4L2_CID_AUDIO_MUTE)
 338                         return -EINVAL;
 339                 strlcpy(u->qc.name, "Mute", sizeof(u->qc.name));
 340                 u->qc.minimum = 0;
 341                 u->qc.maximum = 1;
 342                 u->qc.step = 1;
 343                 u->qc.default_value = 0;
 344                 u->qc.type = V4L2_CTRL_TYPE_BOOLEAN;
 345                 break;
 346
 347         case VIDIOC_G_CTRL:
 348                 dev_dbg(&client->dev, "VIDIOC_G_CTRL %d\n", u->ct.id);
 349                 if (u->ct.id != V4L2_CID_AUDIO_MUTE)
 350                         return -EINVAL;
 351                 if (r->tnctrl & TEA5761_TNCTRL_PUPD0)
 352                         u->ct.value = tea5761_is_muted(tea) ? 1 : 0;
 353                 else
 354                         u->ct.value = 0;
 355                 break;
 356
 357         case VIDIOC_S_CTRL:
 358                 dev_dbg(&client->dev, "VIDIOC_S_CTRL %d\n", u->ct.id);
 359                 if (u->ct.id != V4L2_CID_AUDIO_MUTE)
 360                         return -EINVAL;
 361                 tea5761_mute(tea, u->ct.value);
 362                 break;
 363
 364         default:
 365                 return -ENOIOCTLCMD;
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int tea5761_ioctl(struct inode *inode, struct file *file,
 372                          unsigned int cmd, unsigned long arg)
 373 {
 374         return video_usercopy(inode, file, cmd, arg, tea5761_do_ioctl);
 375 }
 376
 377 static int tea5761_open(struct inode *inode, struct file *file)
 378 {
 379         int minor = iminor(file->f_dentry->d_inode);
 380         /* Currently we support only one device */
 381         struct tea5761_device *tea = &tea5761;
 382
 383         if (tea->video_dev->minor != minor)
 384                 return -ENODEV;
 385
 386         mutex_lock(&tea->mutex);
 387         /* Only exclusive access */
 388         if (tea->users) {
 389                 mutex_unlock(&tea->mutex);
 390                 return -EBUSY;
 391         }
 392         tea->users++;
 393         mutex_unlock(&tea->mutex);
 394
 395         file->private_data = tea;
 396         return 0;
 397 }
 398
 399 static int tea5761_release(struct inode *inode, struct file *file)
 400 {
 401         struct tea5761_device *tea = file->private_data;
 402
 403         mutex_lock(&tea->mutex);
 404         tea->users--;
 405         mutex_unlock(&tea->mutex);
 406
 407         return 0;
 408 }
 409
 410 static struct file_operations tea5761_fops = {
 411         .owner          = THIS_MODULE,
 412         .open           = tea5761_open,
 413         .release        = tea5761_release,
 414         .ioctl          = tea5761_ioctl,
 415         .llseek         = no_llseek,
 416 };
 417
 418 static struct video_device tea5761_video_device = {
 419         .owner         = THIS_MODULE,
 420         .name          = "TEA5761 FM-Radio",
 421         .type          = VID_TYPE_TUNER,
 422         .fops          = &tea5761_fops,
 423         .release       = video_device_release
 424 };
 425
 426 static int tea5761_probe(struct i2c_adapter *adapter, int address,
 427                           int kind)
 428 {
 429         struct i2c_client *client;
 430         struct video_device *video_dev;
 431         int err = 0;
 432         static const char *client_name = "TEA5761 FM-Radio";
 433         struct tea5761_device *tea = &tea5761;
 434         struct tea5761_regs   *r = &tea->regs;
 435
 436         mutex_init(&tea->mutex);
 437         /* I2C detection and initialization */
 438         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 439         if (client == NULL) {
 440                 dev_err(&adapter->dev, DRIVER_NAME
 441                         ": couldn't allocate memory\n");
 442                 return -ENOMEM;
 443         }
 444         tea->i2c_dev = client;
 445
 446         client->addr = address;
 447         client->adapter = adapter;
 448         client->driver = &tea5761_driver;
 449         client->dev.driver = &tea5761_driver.driver;
 450         client->flags = 0;
 451         strlcpy(client->name, client_name, I2C_NAME_SIZE);
 452
 453         if (kind < 0) {
 454                 if (tea5761_read_regs(tea) < 0) {
 455                         dev_info(&client->dev,
 456                                  "chip read failed for %d-%04x\n",
 457                                  adapter->nr, address);
 458                         goto err_tea_dev;
 459                 }
 460                 if (r->chipid != TEA5761_CHIPID) {
 461                         dev_info(&client->dev,
 462                                  "bad chipid (0x%04x) at %d-%04x\n",
 463                                  r->chipid, adapter->nr, address);
 464                         goto err_tea_dev;
 465                 }
 466                 if ((r->manid & 0x0fff) != TEA5761_MANID) {
 467                         dev_info(&client->dev,
 468                                  "bad manid (0x%04x) at %d-%04x\n",
 469                                  r->manid, adapter->nr, address);
 470                         goto err_tea_dev;
 471                 }
 472         }
 473
 474         err = i2c_attach_client(client);
 475         if (err) {
 476                 dev_err(&client->dev, "couldn't attach to address %d-%04x\n",
 477                         adapter->nr, address);
 478                 goto err_tea_dev;
 479         }
 480
 481         /* V4L initialization */
 482         video_dev = video_device_alloc();
 483         if (video_dev == NULL) {
 484                 dev_err(&client->dev, "couldn't allocate memory\n");
 485                 err = -ENOMEM;
 486                 goto err_i2c_attach;
 487         }
 488         tea->video_dev = video_dev;
 489
 490         *video_dev = tea5761_video_device;
 491         video_dev->dev = &client->dev;
 492         i2c_set_clientdata(client, video_dev);
 493
 494         /* initialize and power off the chip */
 495         tea5761_read_regs(tea);
 496         tea5761_set_audout_mode(tea, V4L2_TUNER_MODE_STEREO);
 497         tea5761_mute(tea, 0);
 498         tea5761_power_down(tea);
 499
 500         tea5761.video_dev = video_dev;
 501         tea5761.i2c_dev = client;
 502
 503         err = video_register_device(video_dev, VFL_TYPE_RADIO, radio_nr);
 504         if (err) {
 505                 dev_err(&client->dev, "couldn't register video device\n");
 506                 goto err_video_alloc;
 507         }
 508
 509         dev_info(&client->dev, "tea5761 (version %d) detected at %d-%04x\n",
 510                 (tea->regs.manid >> 12) & 0xf, adapter->nr, address);
 511
 512         return 0;
 513
 514 err_video_alloc:
 515         video_device_release(video_dev);
 516 err_i2c_attach:
 517         i2c_detach_client(client);
 518 err_tea_dev:
 519         kfree(client);
 520         return err;
 521 }
 522
 523 static int tea5761_attach_adapter(struct i2c_adapter *adapter)
 524 {
 525         if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
 526                 return -EINVAL;
 527
 528         return i2c_probe(adapter, &addr_data, tea5761_probe);
 529 }
 530
 531 static int tea5761_detach_client(struct i2c_client *client)
 532 {
 533         struct video_device *vd = i2c_get_clientdata(client);
 534
 535         i2c_detach_client(client);
 536         video_unregister_device(vd);
 537         kfree(client);
 538
 539         return 0;
 540 }
 541
 542 static struct i2c_driver tea5761_driver = {
 543         .id             = I2C_DRIVERID_TUNER,
 544         .driver = {
 545                 .name   = DRIVER_NAME,
 546         },
 547         .attach_adapter = tea5761_attach_adapter,
 548         .detach_client  = tea5761_detach_client,
 549 };
 550
 551 #if CONFIG_ARCH_OMAP
 552 /* No way to pass platform device data. Enable here all the TEA5761
 553  * devices, since I2C address scanning will need them to respond.
 554  */
 555 static int enable_gpio;
 556
 557 static int __init tea5761_dev_init(void)
 558 {
 559         const struct omap_tea5761_config *info;
 560
 561         info = omap_get_config(OMAP_TAG_TEA5761, struct omap_tea5761_config);
 562         if (info) {
 563                 enable_gpio = info->enable_gpio;
 564         }
 565
 566         if (enable_gpio) {
 567                 pr_debug(DRIVER_NAME ": enabling tea5761 at GPIO %d\n",
 568                          enable_gpio);
 569
 570                 if (omap_request_gpio(enable_gpio) < 0) {
 571                         printk(KERN_ERR DRIVER_NAME ": can't request GPIO %d\n",
 572                                enable_gpio);
 573                         return -ENODEV;
 574                 }
 575
 576                 omap_set_gpio_direction(enable_gpio, 0);
 577                 udelay(50);
 578                 omap_set_gpio_dataout(enable_gpio, 1);
 579         }
 580
 581         return 0;
 582 }
 583
 584 static void __exit tea5761_dev_exit(void)
 585 {
 586         if (enable_gpio) {
 587                 omap_set_gpio_dataout(enable_gpio, 0);
 588                 omap_free_gpio(enable_gpio);
 589         }
 590 }
 591 #else
 592 static int __init tea5761_dev_init(void)
 593 {
 594 }
 595
 596 static void __exit tea5761_dev_exit(void)
 597 {
 598 }
 599 #endif
 600
 601 static int __init tea5761_init(void)
 602 {
 603         int res;
 604
 605         if ((res = tea5761_dev_init()) < 0)
 606                 return res;
 607
 608         if ((res = i2c_add_driver(&tea5761_driver))) {
 609                 printk(KERN_ERR DRIVER_NAME ": driver registration failed\n");
 610                 return res;
 611         }
 612
 613         return 0;
 614 }
 615
 616 static void __exit tea5761_exit(void)
 617 {
 618         i2c_del_driver(&tea5761_driver);
 619         tea5761_dev_exit();
 620 }
 621
 622 MODULE_AUTHOR("Timo Teräs");
 623 MODULE_DESCRIPTION("I2C interface for TEA5761.");
 624 MODULE_LICENSE("GPL");
 625
 626 module_param(radio_nr, int, 0);
 627 MODULE_PARM_DESC(nr_radio, "video4linux device number to use");
 628
 629 module_init(tea5761_init)
 630 module_exit(tea5761_exit)