drivers/media/radio/radio-tea5764.c

   1 /*
   2  * driver/media/radio/radio-tea5764.c
   3  *
   4  * Driver for TEA5764 radio chip for linux 2.6.
   5  * This driver is for TEA5764 chip from NXP, used in EZX phones from Motorola.
   6  * The I2C protocol is used for communicate with chip.
   7  *
   8  * Based in radio-tea5761.c Copyright (C) 2005 Nokia Corporation
   9  *
  10  *  Copyright (c) 2008 Fabio Belavenuto <belavenuto@gmail.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  *
  26  * History:
  27  * 2008-12-06   Fabio Belavenuto <belavenuto@gmail.com>
  28  *              initial code
  29  *
  30  * TODO:
  31  *  add platform_data support for IRQs platform dependencies
  32  *  add RDS support
  33  */
  34 #include <linux/kernel.h>
  35 #include <linux/module.h>
  36 #include <linux/init.h>                 /* Initdata                     */
  37 #include <linux/videodev2.h>            /* kernel radio structs         */
  38 #include <linux/i2c.h>                  /* I2C                          */
  39 #include <media/v4l2-common.h>
  40 #include <media/v4l2-ioctl.h>
  41 #include <linux/version.h>              /* for KERNEL_VERSION MACRO     */
  42
  43 #define DRIVER_VERSION  "v0.01"
  44 #define RADIO_VERSION   KERNEL_VERSION(0, 0, 1)
  45
  46 #define DRIVER_AUTHOR   "Fabio Belavenuto <belavenuto@gmail.com>"
  47 #define DRIVER_DESC     "A driver for the TEA5764 radio chip for EZX Phones."
  48
  49 #define PINFO(format, ...)\
  50         printk(KERN_INFO KBUILD_MODNAME ": "\
  51                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
  52 #define PWARN(format, ...)\
  53         printk(KERN_WARNING KBUILD_MODNAME ": "\
  54                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
  55 # define PDEBUG(format, ...)\
  56         printk(KERN_DEBUG KBUILD_MODNAME ": "\
  57                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
  58
  59 /* Frequency limits in MHz -- these are European values.  For Japanese
  60 devices, that would be 76000 and 91000.  */
  61 #define FREQ_MIN  87500
  62 #define FREQ_MAX 108000
  63 #define FREQ_MUL 16
  64
  65 /* TEA5764 registers */
  66 #define TEA5764_MANID           0x002b
  67 #define TEA5764_CHIPID          0x5764
  68
  69 #define TEA5764_INTREG_BLMSK    0x0001
  70 #define TEA5764_INTREG_FRRMSK   0x0002
  71 #define TEA5764_INTREG_LEVMSK   0x0008
  72 #define TEA5764_INTREG_IFMSK    0x0010
  73 #define TEA5764_INTREG_BLMFLAG  0x0100
  74 #define TEA5764_INTREG_FRRFLAG  0x0200
  75 #define TEA5764_INTREG_LEVFLAG  0x0800
  76 #define TEA5764_INTREG_IFFLAG   0x1000
  77
  78 #define TEA5764_FRQSET_SUD      0x8000
  79 #define TEA5764_FRQSET_SM       0x4000
  80
  81 #define TEA5764_TNCTRL_PUPD1    0x8000
  82 #define TEA5764_TNCTRL_PUPD0    0x4000
  83 #define TEA5764_TNCTRL_BLIM     0x2000
  84 #define TEA5764_TNCTRL_SWPM     0x1000
  85 #define TEA5764_TNCTRL_IFCTC    0x0800
  86 #define TEA5764_TNCTRL_AFM      0x0400
  87 #define TEA5764_TNCTRL_SMUTE    0x0200
  88 #define TEA5764_TNCTRL_SNC      0x0100
  89 #define TEA5764_TNCTRL_MU       0x0080
  90 #define TEA5764_TNCTRL_SSL1     0x0040
  91 #define TEA5764_TNCTRL_SSL0     0x0020
  92 #define TEA5764_TNCTRL_HLSI     0x0010
  93 #define TEA5764_TNCTRL_MST      0x0008
  94 #define TEA5764_TNCTRL_SWP      0x0004
  95 #define TEA5764_TNCTRL_DTC      0x0002
  96 #define TEA5764_TNCTRL_AHLSI    0x0001
  97
  98 #define TEA5764_TUNCHK_LEVEL(x) (((x) & 0x00F0) >> 4)
  99 #define TEA5764_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)
 100 #define TEA5764_TUNCHK_TUNTO    0x0100
 101 #define TEA5764_TUNCHK_LD       0x0008
 102 #define TEA5764_TUNCHK_STEREO   0x0004
 103
 104 #define TEA5764_TESTREG_TRIGFR  0x0800
 105
 106 struct tea5764_regs {
 107         u16 intreg;                             /* INTFLAG & INTMSK */
 108         u16 frqset;                             /* FRQSETMSB & FRQSETLSB */
 109         u16 tnctrl;                             /* TNCTRL1 & TNCTRL2 */
 110         u16 frqchk;                             /* FRQCHKMSB & FRQCHKLSB */
 111         u16 tunchk;                             /* IFCHK & LEVCHK */
 112         u16 testreg;                            /* TESTBITS & TESTMODE */
 113         u16 rdsstat;                            /* RDSSTAT1 & RDSSTAT2 */
 114         u16 rdslb;                              /* RDSLBMSB & RDSLBLSB */
 115         u16 rdspb;                              /* RDSPBMSB & RDSPBLSB */
 116         u16 rdsbc;                              /* RDSBBC & RDSGBC */
 117         u16 rdsctrl;                            /* RDSCTRL1 & RDSCTRL2 */
 118         u16 rdsbbl;                             /* PAUSEDET & RDSBBL */
 119         u16 manid;                              /* MANID1 & MANID2 */
 120         u16 chipid;                             /* CHIPID1 & CHIPID2 */
 121 } __attribute__ ((packed));
 122
 123 struct tea5764_write_regs {
 124         u8 intreg;                              /* INTMSK */
 125         u16 frqset;                             /* FRQSETMSB & FRQSETLSB */
 126         u16 tnctrl;                             /* TNCTRL1 & TNCTRL2 */
 127         u16 testreg;                            /* TESTBITS & TESTMODE */
 128         u16 rdsctrl;                            /* RDSCTRL1 & RDSCTRL2 */
 129         u16 rdsbbl;                             /* PAUSEDET & RDSBBL */
 130 } __attribute__ ((packed));
 131
 132 #ifndef RADIO_TEA5764_XTAL
 133 #define RADIO_TEA5764_XTAL 1
 134 #endif
 135
 136 static int radio_nr = -1;
 137 static int use_xtal = RADIO_TEA5764_XTAL;
 138
 139 struct tea5764_device {
 140         struct i2c_client               *i2c_client;
 141         struct video_device             *videodev;
 142         struct tea5764_regs             regs;
 143         struct mutex                    mutex;
 144         int                             users;
 145 };
 146
 147 /* I2C code related */
 148 int tea5764_i2c_read(struct tea5764_device *radio)
 149 {
 150         int i;
 151         u16 *p = (u16 *) &radio->regs;
 152
 153         struct i2c_msg msgs[1] = {
 154                 { radio->i2c_client->addr, I2C_M_RD, sizeof(radio->regs),
 155                         (void *)&radio->regs },
 156         };
 157         if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
 158                 return -EIO;
 159         for (i = 0; i < sizeof(struct tea5764_regs) / sizeof(u16); i++)
 160                 p[i] = __be16_to_cpu(p[i]);
 161
 162         return 0;
 163 }
 164
 165 int tea5764_i2c_write(struct tea5764_device *radio)
 166 {
 167         struct tea5764_write_regs wr;
 168         struct tea5764_regs *r = &radio->regs;
 169         struct i2c_msg msgs[1] = {
 170                 { radio->i2c_client->addr, 0, sizeof(wr), (void *) &wr },
 171         };
 172         wr.intreg  = r->intreg & 0xff;
 173         wr.frqset  = __cpu_to_be16(r->frqset);
 174         wr.tnctrl  = __cpu_to_be16(r->tnctrl);
 175         wr.testreg = __cpu_to_be16(r->testreg);
 176         wr.rdsctrl = __cpu_to_be16(r->rdsctrl);
 177         wr.rdsbbl  = __cpu_to_be16(r->rdsbbl);
 178         if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
 179                 return -EIO;
 180         return 0;
 181 }
 182
 183 /* V4L2 code related */
 184 static struct v4l2_queryctrl radio_qctrl[] = {
 185         {
 186                 .id            = V4L2_CID_AUDIO_MUTE,
 187                 .name          = "Mute",
 188                 .minimum       = 0,
 189                 .maximum       = 1,
 190                 .default_value = 1,
 191                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 192         }
 193 };
 194
 195 static void tea5764_power_up(struct tea5764_device *radio)
 196 {
 197         struct tea5764_regs *r = &radio->regs;
 198
 199         if (!(r->tnctrl & TEA5764_TNCTRL_PUPD0)) {
 200                 r->tnctrl &= ~(TEA5764_TNCTRL_AFM | TEA5764_TNCTRL_MU |
 201                                TEA5764_TNCTRL_HLSI);
 202                 if (!use_xtal)
 203                         r->testreg |= TEA5764_TESTREG_TRIGFR;
 204                 else
 205                         r->testreg &= ~TEA5764_TESTREG_TRIGFR;
 206
 207                 r->tnctrl |= TEA5764_TNCTRL_PUPD0;
 208                 tea5764_i2c_write(radio);
 209         }
 210 }
 211
 212 static void tea5764_power_down(struct tea5764_device *radio)
 213 {
 214         struct tea5764_regs *r = &radio->regs;
 215
 216         if (r->tnctrl & TEA5764_TNCTRL_PUPD0) {
 217                 r->tnctrl &= ~TEA5764_TNCTRL_PUPD0;
 218                 tea5764_i2c_write(radio);
 219         }
 220 }
 221
 222 static void tea5764_set_freq(struct tea5764_device *radio, int freq)
 223 {
 224         struct tea5764_regs *r = &radio->regs;
 225
 226         /* formula: (freq [+ or -] 225000) / 8192 */
 227         if (r->tnctrl & TEA5764_TNCTRL_HLSI)
 228                 r->frqset = (freq + 225000) / 8192;
 229         else
 230                 r->frqset = (freq - 225000) / 8192;
 231 }
 232
 233 static int tea5764_get_freq(struct tea5764_device *radio)
 234 {
 235         struct tea5764_regs *r = &radio->regs;
 236
 237         if (r->tnctrl & TEA5764_TNCTRL_HLSI)
 238                 return (r->frqchk * 8192) - 225000;
 239         else
 240                 return (r->frqchk * 8192) + 225000;
 241 }
 242
 243 /* tune an frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 244 static void tea5764_tune(struct tea5764_device *radio, int freq)
 245 {
 246         tea5764_set_freq(radio, freq);
 247         if (tea5764_i2c_write(radio))
 248                 PWARN("Could not set frequency!");
 249 }
 250
 251 static void tea5764_set_audout_mode(struct tea5764_device *radio, int audmode)
 252 {
 253         struct tea5764_regs *r = &radio->regs;
 254         int tnctrl = r->tnctrl;
 255
 256         if (audmode == V4L2_TUNER_MODE_MONO)
 257                 r->tnctrl |= TEA5764_TNCTRL_MST;
 258         else
 259                 r->tnctrl &= ~TEA5764_TNCTRL_MST;
 260         if (tnctrl != r->tnctrl)
 261                 tea5764_i2c_write(radio);
 262 }
 263
 264 static int tea5764_get_audout_mode(struct tea5764_device *radio)
 265 {
 266         struct tea5764_regs *r = &radio->regs;
 267
 268         if (r->tnctrl & TEA5764_TNCTRL_MST)
 269                 return V4L2_TUNER_MODE_MONO;
 270         else
 271                 return V4L2_TUNER_MODE_STEREO;
 272 }
 273
 274 static void tea5764_mute(struct tea5764_device *radio, int on)
 275 {
 276         struct tea5764_regs *r = &radio->regs;
 277         int tnctrl = r->tnctrl;
 278
 279         if (on)
 280                 r->tnctrl |= TEA5764_TNCTRL_MU;
 281         else
 282                 r->tnctrl &= ~TEA5764_TNCTRL_MU;
 283         if (tnctrl != r->tnctrl)
 284                 tea5764_i2c_write(radio);
 285 }
 286
 287 static int tea5764_is_muted(struct tea5764_device *radio)
 288 {
 289         return radio->regs.tnctrl & TEA5764_TNCTRL_MU;
 290 }
 291
 292 /* V4L2 vidioc */
 293 static int vidioc_querycap(struct file *file, void  *priv,
 294                                         struct v4l2_capability *v)
 295 {
 296         struct tea5764_device *radio = video_drvdata(file);
 297         struct video_device *dev = radio->videodev;
 298
 299         strlcpy(v->driver, dev->dev.driver->name, sizeof(v->driver));
 300         strlcpy(v->card, dev->name, sizeof(v->card));
 301         snprintf(v->bus_info, sizeof(v->bus_info),
 302                  "I2C:%s", dev_name(&dev->dev));
 303         v->version = RADIO_VERSION;
 304         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 305         return 0;
 306 }
 307
 308 static int vidioc_g_tuner(struct file *file, void *priv,
 309                                 struct v4l2_tuner *v)
 310 {
 311         struct tea5764_device *radio = video_drvdata(file);
 312         struct tea5764_regs *r = &radio->regs;
 313
 314         if (v->index > 0)
 315                 return -EINVAL;
 316
 317         memset(v, 0, sizeof(v));
 318         strcpy(v->name, "FM");
 319         v->type = V4L2_TUNER_RADIO;
 320         tea5764_i2c_read(radio);
 321         v->rangelow   = FREQ_MIN * FREQ_MUL;
 322         v->rangehigh  = FREQ_MAX * FREQ_MUL;
 323         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 324         if (r->tunchk & TEA5764_TUNCHK_STEREO)
 325                 v->rxsubchans = V4L2_TUNER_SUB_STEREO;
 326         else
 327                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 328         v->audmode = tea5764_get_audout_mode(radio);
 329         v->signal = TEA5764_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;
 330         v->afc = TEA5764_TUNCHK_IFCNT(r->tunchk);
 331
 332         return 0;
 333 }
 334
 335 static int vidioc_s_tuner(struct file *file, void *priv,
 336                                 struct v4l2_tuner *v)
 337 {
 338         struct tea5764_device *radio = video_drvdata(file);
 339
 340         if (v->index > 0)
 341                 return -EINVAL;
 342
 343         tea5764_set_audout_mode(radio, v->audmode);
 344         return 0;
 345 }
 346
 347 static int vidioc_s_frequency(struct file *file, void *priv,
 348                                 struct v4l2_frequency *f)
 349 {
 350         struct tea5764_device *radio = video_drvdata(file);
 351
 352         if (f->tuner != 0)
 353                 return -EINVAL;
 354         if (f->frequency == 0) {
 355                 /* We special case this as a power down control. */
 356                 tea5764_power_down(radio);
 357         }
 358         if (f->frequency < (FREQ_MIN * FREQ_MUL))
 359                 return -EINVAL;
 360         if (f->frequency > (FREQ_MAX * FREQ_MUL))
 361                 return -EINVAL;
 362         tea5764_power_up(radio);
 363         tea5764_tune(radio, (f->frequency * 125) / 2);
 364         return 0;
 365 }
 366
 367 static int vidioc_g_frequency(struct file *file, void *priv,
 368                                 struct v4l2_frequency *f)
 369 {
 370         struct tea5764_device *radio = video_drvdata(file);
 371         struct tea5764_regs *r = &radio->regs;
 372
 373         tea5764_i2c_read(radio);
 374         memset(f, 0, sizeof(f));
 375         f->type = V4L2_TUNER_RADIO;
 376         if (r->tnctrl & TEA5764_TNCTRL_PUPD0)
 377                 f->frequency = (tea5764_get_freq(radio) * 2) / 125;
 378         else
 379                 f->frequency = 0;
 380
 381         return 0;
 382 }
 383
 384 static int vidioc_queryctrl(struct file *file, void *priv,
 385                             struct v4l2_queryctrl *qc)
 386 {
 387         int i;
 388
 389         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 390                 if (qc->id && qc->id == radio_qctrl[i].id) {
 391                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 392                         return 0;
 393                 }
 394         }
 395         return -EINVAL;
 396 }
 397
 398 static int vidioc_g_ctrl(struct file *file, void *priv,
 399                             struct v4l2_control *ctrl)
 400 {
 401         struct tea5764_device *radio = video_drvdata(file);
 402
 403         switch (ctrl->id) {
 404         case V4L2_CID_AUDIO_MUTE:
 405                 tea5764_i2c_read(radio);
 406                 ctrl->value = tea5764_is_muted(radio) ? 1 : 0;
 407                 return 0;
 408         }
 409         return -EINVAL;
 410 }
 411
 412 static int vidioc_s_ctrl(struct file *file, void *priv,
 413                             struct v4l2_control *ctrl)
 414 {
 415         struct tea5764_device *radio = video_drvdata(file);
 416
 417         switch (ctrl->id) {
 418         case V4L2_CID_AUDIO_MUTE:
 419                 tea5764_mute(radio, ctrl->value);
 420                 return 0;
 421         }
 422         return -EINVAL;
 423 }
 424
 425 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 426 {
 427         *i = 0;
 428         return 0;
 429 }
 430
 431 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 432 {
 433         if (i != 0)
 434                 return -EINVAL;
 435         return 0;
 436 }
 437
 438 static int vidioc_g_audio(struct file *file, void *priv,
 439                            struct v4l2_audio *a)
 440 {
 441         if (a->index > 1)
 442                 return -EINVAL;
 443
 444         strcpy(a->name, "Radio");
 445         a->capability = V4L2_AUDCAP_STEREO;
 446         return 0;
 447 }
 448
 449 static int vidioc_s_audio(struct file *file, void *priv,
 450                            struct v4l2_audio *a)
 451 {
 452         if (a->index != 0)
 453                 return -EINVAL;
 454
 455         return 0;
 456 }
 457
 458 static int tea5764_open(struct file *file)
 459 {
 460         /* Currently we support only one device */
 461         int minor = video_devdata(file)->minor;
 462         struct tea5764_device *radio = video_drvdata(file);
 463
 464         if (radio->videodev->minor != minor)
 465                 return -ENODEV;
 466
 467         mutex_lock(&radio->mutex);
 468         /* Only exclusive access */
 469         if (radio->users) {
 470                 mutex_unlock(&radio->mutex);
 471                 return -EBUSY;
 472         }
 473         radio->users++;
 474         mutex_unlock(&radio->mutex);
 475         file->private_data = radio;
 476         return 0;
 477 }
 478
 479 static int tea5764_close(struct file *file)
 480 {
 481         struct tea5764_device *radio = video_drvdata(file);
 482
 483         if (!radio)
 484                 return -ENODEV;
 485         mutex_lock(&radio->mutex);
 486         radio->users--;
 487         mutex_unlock(&radio->mutex);
 488         return 0;
 489 }
 490
 491 /* File system interface */
 492 static const struct v4l2_file_operations tea5764_fops = {
 493         .owner          = THIS_MODULE,
 494         .open           = tea5764_open,
 495         .release        = tea5764_close,
 496         .ioctl          = video_ioctl2,
 497 };
 498
 499 static const struct v4l2_ioctl_ops tea5764_ioctl_ops = {
 500         .vidioc_querycap    = vidioc_querycap,
 501         .vidioc_g_tuner     = vidioc_g_tuner,
 502         .vidioc_s_tuner     = vidioc_s_tuner,
 503         .vidioc_g_audio     = vidioc_g_audio,
 504         .vidioc_s_audio     = vidioc_s_audio,
 505         .vidioc_g_input     = vidioc_g_input,
 506         .vidioc_s_input     = vidioc_s_input,
 507         .vidioc_g_frequency = vidioc_g_frequency,
 508         .vidioc_s_frequency = vidioc_s_frequency,
 509         .vidioc_queryctrl   = vidioc_queryctrl,
 510         .vidioc_g_ctrl      = vidioc_g_ctrl,
 511         .vidioc_s_ctrl      = vidioc_s_ctrl,
 512 };
 513
 514 /* V4L2 interface */
 515 static struct video_device tea5764_radio_template = {
 516         .name           = "TEA5764 FM-Radio",
 517         .fops           = &tea5764_fops,
 518         .ioctl_ops      = &tea5764_ioctl_ops,
 519         .release        = video_device_release,
 520 };
 521
 522 /* I2C probe: check if the device exists and register with v4l if it is */
 523 static int __devinit tea5764_i2c_probe(struct i2c_client *client,
 524                                         const struct i2c_device_id *id)
 525 {
 526         struct tea5764_device *radio;
 527         struct tea5764_regs *r;
 528         int ret;
 529
 530         PDEBUG("probe");
 531         radio = kmalloc(sizeof(struct tea5764_device), GFP_KERNEL);
 532         if (!radio)
 533                 return -ENOMEM;
 534
 535         mutex_init(&radio->mutex);
 536         radio->i2c_client = client;
 537         ret = tea5764_i2c_read(radio);
 538         if (ret)
 539                 goto errfr;
 540         r = &radio->regs;
 541         PDEBUG("chipid = %04X, manid = %04X", r->chipid, r->manid);
 542         if (r->chipid != TEA5764_CHIPID ||
 543                 (r->manid & 0x0fff) != TEA5764_MANID) {
 544                 PWARN("This chip is not a TEA5764!");
 545                 ret = -EINVAL;
 546                 goto errfr;
 547         }
 548
 549         radio->videodev = video_device_alloc();
 550         if (!(radio->videodev)) {
 551                 ret = -ENOMEM;
 552                 goto errfr;
 553         }
 554         memcpy(radio->videodev, &tea5764_radio_template,
 555                 sizeof(tea5764_radio_template));
 556
 557         i2c_set_clientdata(client, radio);
 558         video_set_drvdata(radio->videodev, radio);
 559
 560         ret = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr);
 561         if (ret < 0) {
 562                 PWARN("Could not register video device!");
 563                 goto errrel;
 564         }
 565
 566         /* initialize and power off the chip */
 567         tea5764_i2c_read(radio);
 568         tea5764_set_audout_mode(radio, V4L2_TUNER_MODE_STEREO);
 569         tea5764_mute(radio, 1);
 570         tea5764_power_down(radio);
 571
 572         PINFO("registered.");
 573         return 0;
 574 errrel:
 575         video_device_release(radio->videodev);
 576 errfr:
 577         kfree(radio);
 578         return ret;
 579 }
 580
 581 static int __devexit tea5764_i2c_remove(struct i2c_client *client)
 582 {
 583         struct tea5764_device *radio = i2c_get_clientdata(client);
 584
 585         PDEBUG("remove");
 586         if (radio) {
 587                 tea5764_power_down(radio);
 588                 video_unregister_device(radio->videodev);
 589                 kfree(radio);
 590         }
 591         return 0;
 592 }
 593
 594 /* I2C subsystem interface */
 595 static const struct i2c_device_id tea5764_id[] = {
 596         { "radio-tea5764", 0 },
 597         { }                                     /* Terminating entry */
 598 };
 599 MODULE_DEVICE_TABLE(i2c, tea5764_id);
 600
 601 static struct i2c_driver tea5764_i2c_driver = {
 602         .driver = {
 603                 .name = "radio-tea5764",
 604                 .owner = THIS_MODULE,
 605         },
 606         .probe = tea5764_i2c_probe,
 607         .remove = __devexit_p(tea5764_i2c_remove),
 608         .id_table = tea5764_id,
 609 };
 610
 611 /* init the driver */
 612 static int __init tea5764_init(void)
 613 {
 614         int ret = i2c_add_driver(&tea5764_i2c_driver);
 615
 616         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ": "
 617                 DRIVER_DESC "\n");
 618         return ret;
 619 }
 620
 621 /* cleanup the driver */
 622 static void __exit tea5764_exit(void)
 623 {
 624         i2c_del_driver(&tea5764_i2c_driver);
 625 }
 626
 627 MODULE_AUTHOR(DRIVER_AUTHOR);
 628 MODULE_DESCRIPTION(DRIVER_DESC);
 629 MODULE_LICENSE("GPL");
 630
 631 module_param(use_xtal, int, 1);
 632 MODULE_PARM_DESC(use_xtal, "Chip have a xtal connected in board");
 633 module_param(radio_nr, int, 0);
 634 MODULE_PARM_DESC(radio_nr, "video4linux device number to use");
 635
 636 module_init(tea5764_init);
 637 module_exit(tea5764_exit);