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/slab.h>
  36 #include <linux/module.h>
  37 #include <linux/init.h>                 /* Initdata                     */
  38 #include <linux/videodev2.h>            /* kernel radio structs         */
  39 #include <linux/i2c.h>                  /* I2C                          */
  40 #include <media/v4l2-common.h>
  41 #include <media/v4l2-ioctl.h>
  42
  43 #define DRIVER_VERSION  "0.0.2"
  44
  45 #define DRIVER_AUTHOR   "Fabio Belavenuto <belavenuto@gmail.com>"
  46 #define DRIVER_DESC     "A driver for the TEA5764 radio chip for EZX Phones."
  47
  48 #define PINFO(format, ...)\
  49         printk(KERN_INFO KBUILD_MODNAME ": "\
  50                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
  51 #define PWARN(format, ...)\
  52         printk(KERN_WARNING KBUILD_MODNAME ": "\
  53                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
  54 # define PDEBUG(format, ...)\
  55         printk(KERN_DEBUG KBUILD_MODNAME ": "\
  56                 DRIVER_VERSION ": " format "\n", ## __VA_ARGS__)
  57
  58 /* Frequency limits in MHz -- these are European values.  For Japanese
  59 devices, that would be 76000 and 91000.  */
  60 #define FREQ_MIN  87500
  61 #define FREQ_MAX 108000
  62 #define FREQ_MUL 16
  63
  64 /* TEA5764 registers */
  65 #define TEA5764_MANID           0x002b
  66 #define TEA5764_CHIPID          0x5764
  67
  68 #define TEA5764_INTREG_BLMSK    0x0001
  69 #define TEA5764_INTREG_FRRMSK   0x0002
  70 #define TEA5764_INTREG_LEVMSK   0x0008
  71 #define TEA5764_INTREG_IFMSK    0x0010
  72 #define TEA5764_INTREG_BLMFLAG  0x0100
  73 #define TEA5764_INTREG_FRRFLAG  0x0200
  74 #define TEA5764_INTREG_LEVFLAG  0x0800
  75 #define TEA5764_INTREG_IFFLAG   0x1000
  76
  77 #define TEA5764_FRQSET_SUD      0x8000
  78 #define TEA5764_FRQSET_SM       0x4000
  79
  80 #define TEA5764_TNCTRL_PUPD1    0x8000
  81 #define TEA5764_TNCTRL_PUPD0    0x4000
  82 #define TEA5764_TNCTRL_BLIM     0x2000
  83 #define TEA5764_TNCTRL_SWPM     0x1000
  84 #define TEA5764_TNCTRL_IFCTC    0x0800
  85 #define TEA5764_TNCTRL_AFM      0x0400
  86 #define TEA5764_TNCTRL_SMUTE    0x0200
  87 #define TEA5764_TNCTRL_SNC      0x0100
  88 #define TEA5764_TNCTRL_MU       0x0080
  89 #define TEA5764_TNCTRL_SSL1     0x0040
  90 #define TEA5764_TNCTRL_SSL0     0x0020
  91 #define TEA5764_TNCTRL_HLSI     0x0010
  92 #define TEA5764_TNCTRL_MST      0x0008
  93 #define TEA5764_TNCTRL_SWP      0x0004
  94 #define TEA5764_TNCTRL_DTC      0x0002
  95 #define TEA5764_TNCTRL_AHLSI    0x0001
  96
  97 #define TEA5764_TUNCHK_LEVEL(x) (((x) & 0x00F0) >> 4)
  98 #define TEA5764_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)
  99 #define TEA5764_TUNCHK_TUNTO    0x0100
 100 #define TEA5764_TUNCHK_LD       0x0008
 101 #define TEA5764_TUNCHK_STEREO   0x0004
 102
 103 #define TEA5764_TESTREG_TRIGFR  0x0800
 104
 105 struct tea5764_regs {
 106         u16 intreg;                             /* INTFLAG & INTMSK */
 107         u16 frqset;                             /* FRQSETMSB & FRQSETLSB */
 108         u16 tnctrl;                             /* TNCTRL1 & TNCTRL2 */
 109         u16 frqchk;                             /* FRQCHKMSB & FRQCHKLSB */
 110         u16 tunchk;                             /* IFCHK & LEVCHK */
 111         u16 testreg;                            /* TESTBITS & TESTMODE */
 112         u16 rdsstat;                            /* RDSSTAT1 & RDSSTAT2 */
 113         u16 rdslb;                              /* RDSLBMSB & RDSLBLSB */
 114         u16 rdspb;                              /* RDSPBMSB & RDSPBLSB */
 115         u16 rdsbc;                              /* RDSBBC & RDSGBC */
 116         u16 rdsctrl;                            /* RDSCTRL1 & RDSCTRL2 */
 117         u16 rdsbbl;                             /* PAUSEDET & RDSBBL */
 118         u16 manid;                              /* MANID1 & MANID2 */
 119         u16 chipid;                             /* CHIPID1 & CHIPID2 */
 120 } __attribute__ ((packed));
 121
 122 struct tea5764_write_regs {
 123         u8 intreg;                              /* INTMSK */
 124         u16 frqset;                             /* FRQSETMSB & FRQSETLSB */
 125         u16 tnctrl;                             /* TNCTRL1 & TNCTRL2 */
 126         u16 testreg;                            /* TESTBITS & TESTMODE */
 127         u16 rdsctrl;                            /* RDSCTRL1 & RDSCTRL2 */
 128         u16 rdsbbl;                             /* PAUSEDET & RDSBBL */
 129 } __attribute__ ((packed));
 130
 131 #ifndef RADIO_TEA5764_XTAL
 132 #define RADIO_TEA5764_XTAL 1
 133 #endif
 134
 135 static int radio_nr = -1;
 136 static int use_xtal = RADIO_TEA5764_XTAL;
 137
 138 struct tea5764_device {
 139         struct i2c_client               *i2c_client;
 140         struct video_device             *videodev;
 141         struct tea5764_regs             regs;
 142         struct mutex                    mutex;
 143 };
 144
 145 /* I2C code related */
 146 int tea5764_i2c_read(struct tea5764_device *radio)
 147 {
 148         int i;
 149         u16 *p = (u16 *) &radio->regs;
 150
 151         struct i2c_msg msgs[1] = {
 152                 { radio->i2c_client->addr, I2C_M_RD, sizeof(radio->regs),
 153                         (void *)&radio->regs },
 154         };
 155         if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
 156                 return -EIO;
 157         for (i = 0; i < sizeof(struct tea5764_regs) / sizeof(u16); i++)
 158                 p[i] = __be16_to_cpu(p[i]);
 159
 160         return 0;
 161 }
 162
 163 int tea5764_i2c_write(struct tea5764_device *radio)
 164 {
 165         struct tea5764_write_regs wr;
 166         struct tea5764_regs *r = &radio->regs;
 167         struct i2c_msg msgs[1] = {
 168                 { radio->i2c_client->addr, 0, sizeof(wr), (void *) &wr },
 169         };
 170         wr.intreg  = r->intreg & 0xff;
 171         wr.frqset  = __cpu_to_be16(r->frqset);
 172         wr.tnctrl  = __cpu_to_be16(r->tnctrl);
 173         wr.testreg = __cpu_to_be16(r->testreg);
 174         wr.rdsctrl = __cpu_to_be16(r->rdsctrl);
 175         wr.rdsbbl  = __cpu_to_be16(r->rdsbbl);
 176         if (i2c_transfer(radio->i2c_client->adapter, msgs, 1) != 1)
 177                 return -EIO;
 178         return 0;
 179 }
 180
 181 /* V4L2 code related */
 182 static struct v4l2_queryctrl radio_qctrl[] = {
 183         {
 184                 .id            = V4L2_CID_AUDIO_MUTE,
 185                 .name          = "Mute",
 186                 .minimum       = 0,
 187                 .maximum       = 1,
 188                 .default_value = 1,
 189                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 190         }
 191 };
 192
 193 static void tea5764_power_up(struct tea5764_device *radio)
 194 {
 195         struct tea5764_regs *r = &radio->regs;
 196
 197         if (!(r->tnctrl & TEA5764_TNCTRL_PUPD0)) {
 198                 r->tnctrl &= ~(TEA5764_TNCTRL_AFM | TEA5764_TNCTRL_MU |
 199                                TEA5764_TNCTRL_HLSI);
 200                 if (!use_xtal)
 201                         r->testreg |= TEA5764_TESTREG_TRIGFR;
 202                 else
 203                         r->testreg &= ~TEA5764_TESTREG_TRIGFR;
 204
 205                 r->tnctrl |= TEA5764_TNCTRL_PUPD0;
 206                 tea5764_i2c_write(radio);
 207         }
 208 }
 209
 210 static void tea5764_power_down(struct tea5764_device *radio)
 211 {
 212         struct tea5764_regs *r = &radio->regs;
 213
 214         if (r->tnctrl & TEA5764_TNCTRL_PUPD0) {
 215                 r->tnctrl &= ~TEA5764_TNCTRL_PUPD0;
 216                 tea5764_i2c_write(radio);
 217         }
 218 }
 219
 220 static void tea5764_set_freq(struct tea5764_device *radio, int freq)
 221 {
 222         struct tea5764_regs *r = &radio->regs;
 223
 224         /* formula: (freq [+ or -] 225000) / 8192 */
 225         if (r->tnctrl & TEA5764_TNCTRL_HLSI)
 226                 r->frqset = (freq + 225000) / 8192;
 227         else
 228                 r->frqset = (freq - 225000) / 8192;
 229 }
 230
 231 static int tea5764_get_freq(struct tea5764_device *radio)
 232 {
 233         struct tea5764_regs *r = &radio->regs;
 234
 235         if (r->tnctrl & TEA5764_TNCTRL_HLSI)
 236                 return (r->frqchk * 8192) - 225000;
 237         else
 238                 return (r->frqchk * 8192) + 225000;
 239 }
 240
 241 /* tune an frequency, freq is defined by v4l's TUNER_LOW, i.e. 1/16th kHz */
 242 static void tea5764_tune(struct tea5764_device *radio, int freq)
 243 {
 244         tea5764_set_freq(radio, freq);
 245         if (tea5764_i2c_write(radio))
 246                 PWARN("Could not set frequency!");
 247 }
 248
 249 static void tea5764_set_audout_mode(struct tea5764_device *radio, int audmode)
 250 {
 251         struct tea5764_regs *r = &radio->regs;
 252         int tnctrl = r->tnctrl;
 253
 254         if (audmode == V4L2_TUNER_MODE_MONO)
 255                 r->tnctrl |= TEA5764_TNCTRL_MST;
 256         else
 257                 r->tnctrl &= ~TEA5764_TNCTRL_MST;
 258         if (tnctrl != r->tnctrl)
 259                 tea5764_i2c_write(radio);
 260 }
 261
 262 static int tea5764_get_audout_mode(struct tea5764_device *radio)
 263 {
 264         struct tea5764_regs *r = &radio->regs;
 265
 266         if (r->tnctrl & TEA5764_TNCTRL_MST)
 267                 return V4L2_TUNER_MODE_MONO;
 268         else
 269                 return V4L2_TUNER_MODE_STEREO;
 270 }
 271
 272 static void tea5764_mute(struct tea5764_device *radio, int on)
 273 {
 274         struct tea5764_regs *r = &radio->regs;
 275         int tnctrl = r->tnctrl;
 276
 277         if (on)
 278                 r->tnctrl |= TEA5764_TNCTRL_MU;
 279         else
 280                 r->tnctrl &= ~TEA5764_TNCTRL_MU;
 281         if (tnctrl != r->tnctrl)
 282                 tea5764_i2c_write(radio);
 283 }
 284
 285 static int tea5764_is_muted(struct tea5764_device *radio)
 286 {
 287         return radio->regs.tnctrl & TEA5764_TNCTRL_MU;
 288 }
 289
 290 /* V4L2 vidioc */
 291 static int vidioc_querycap(struct file *file, void  *priv,
 292                                         struct v4l2_capability *v)
 293 {
 294         struct tea5764_device *radio = video_drvdata(file);
 295         struct video_device *dev = radio->videodev;
 296
 297         strlcpy(v->driver, dev->dev.driver->name, sizeof(v->driver));
 298         strlcpy(v->card, dev->name, sizeof(v->card));
 299         snprintf(v->bus_info, sizeof(v->bus_info),
 300                  "I2C:%s", dev_name(&dev->dev));
 301         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 302         return 0;
 303 }
 304
 305 static int vidioc_g_tuner(struct file *file, void *priv,
 306                                 struct v4l2_tuner *v)
 307 {
 308         struct tea5764_device *radio = video_drvdata(file);
 309         struct tea5764_regs *r = &radio->regs;
 310
 311         if (v->index > 0)
 312                 return -EINVAL;
 313
 314         memset(v, 0, sizeof(*v));
 315         strcpy(v->name, "FM");
 316         v->type = V4L2_TUNER_RADIO;
 317         tea5764_i2c_read(radio);
 318         v->rangelow   = FREQ_MIN * FREQ_MUL;
 319         v->rangehigh  = FREQ_MAX * FREQ_MUL;
 320         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 321         if (r->tunchk & TEA5764_TUNCHK_STEREO)
 322                 v->rxsubchans = V4L2_TUNER_SUB_STEREO;
 323         else
 324                 v->rxsubchans = V4L2_TUNER_SUB_MONO;
 325         v->audmode = tea5764_get_audout_mode(radio);
 326         v->signal = TEA5764_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;
 327         v->afc = TEA5764_TUNCHK_IFCNT(r->tunchk);
 328
 329         return 0;
 330 }
 331
 332 static int vidioc_s_tuner(struct file *file, void *priv,
 333                                 struct v4l2_tuner *v)
 334 {
 335         struct tea5764_device *radio = video_drvdata(file);
 336
 337         if (v->index > 0)
 338                 return -EINVAL;
 339
 340         tea5764_set_audout_mode(radio, v->audmode);
 341         return 0;
 342 }
 343
 344 static int vidioc_s_frequency(struct file *file, void *priv,
 345                                 struct v4l2_frequency *f)
 346 {
 347         struct tea5764_device *radio = video_drvdata(file);
 348
 349         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 350                 return -EINVAL;
 351         if (f->frequency == 0) {
 352                 /* We special case this as a power down control. */
 353                 tea5764_power_down(radio);
 354         }
 355         if (f->frequency < (FREQ_MIN * FREQ_MUL))
 356                 return -EINVAL;
 357         if (f->frequency > (FREQ_MAX * FREQ_MUL))
 358                 return -EINVAL;
 359         tea5764_power_up(radio);
 360         tea5764_tune(radio, (f->frequency * 125) / 2);
 361         return 0;
 362 }
 363
 364 static int vidioc_g_frequency(struct file *file, void *priv,
 365                                 struct v4l2_frequency *f)
 366 {
 367         struct tea5764_device *radio = video_drvdata(file);
 368         struct tea5764_regs *r = &radio->regs;
 369
 370         if (f->tuner != 0)
 371                 return -EINVAL;
 372         tea5764_i2c_read(radio);
 373         memset(f, 0, sizeof(*f));
 374         f->type = V4L2_TUNER_RADIO;
 375         if (r->tnctrl & TEA5764_TNCTRL_PUPD0)
 376                 f->frequency = (tea5764_get_freq(radio) * 2) / 125;
 377         else
 378                 f->frequency = 0;
 379
 380         return 0;
 381 }
 382
 383 static int vidioc_queryctrl(struct file *file, void *priv,
 384                             struct v4l2_queryctrl *qc)
 385 {
 386         int i;
 387
 388         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 389                 if (qc->id && qc->id == radio_qctrl[i].id) {
 390                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 391                         return 0;
 392                 }
 393         }
 394         return -EINVAL;
 395 }
 396
 397 static int vidioc_g_ctrl(struct file *file, void *priv,
 398                             struct v4l2_control *ctrl)
 399 {
 400         struct tea5764_device *radio = video_drvdata(file);
 401
 402         switch (ctrl->id) {
 403         case V4L2_CID_AUDIO_MUTE:
 404                 tea5764_i2c_read(radio);
 405                 ctrl->value = tea5764_is_muted(radio) ? 1 : 0;
 406                 return 0;
 407         }
 408         return -EINVAL;
 409 }
 410
 411 static int vidioc_s_ctrl(struct file *file, void *priv,
 412                             struct v4l2_control *ctrl)
 413 {
 414         struct tea5764_device *radio = video_drvdata(file);
 415
 416         switch (ctrl->id) {
 417         case V4L2_CID_AUDIO_MUTE:
 418                 tea5764_mute(radio, ctrl->value);
 419                 return 0;
 420         }
 421         return -EINVAL;
 422 }
 423
 424 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 425 {
 426         *i = 0;
 427         return 0;
 428 }
 429
 430 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 431 {
 432         if (i != 0)
 433                 return -EINVAL;
 434         return 0;
 435 }
 436
 437 static int vidioc_g_audio(struct file *file, void *priv,
 438                            struct v4l2_audio *a)
 439 {
 440         if (a->index > 1)
 441                 return -EINVAL;
 442
 443         strcpy(a->name, "Radio");
 444         a->capability = V4L2_AUDCAP_STEREO;
 445         return 0;
 446 }
 447
 448 static int vidioc_s_audio(struct file *file, void *priv,
 449                            struct v4l2_audio *a)
 450 {
 451         if (a->index != 0)
 452                 return -EINVAL;
 453
 454         return 0;
 455 }
 456
 457 /* File system interface */
 458 static const struct v4l2_file_operations tea5764_fops = {
 459         .owner          = THIS_MODULE,
 460         .unlocked_ioctl = video_ioctl2,
 461 };
 462
 463 static const struct v4l2_ioctl_ops tea5764_ioctl_ops = {
 464         .vidioc_querycap    = vidioc_querycap,
 465         .vidioc_g_tuner     = vidioc_g_tuner,
 466         .vidioc_s_tuner     = vidioc_s_tuner,
 467         .vidioc_g_audio     = vidioc_g_audio,
 468         .vidioc_s_audio     = vidioc_s_audio,
 469         .vidioc_g_input     = vidioc_g_input,
 470         .vidioc_s_input     = vidioc_s_input,
 471         .vidioc_g_frequency = vidioc_g_frequency,
 472         .vidioc_s_frequency = vidioc_s_frequency,
 473         .vidioc_queryctrl   = vidioc_queryctrl,
 474         .vidioc_g_ctrl      = vidioc_g_ctrl,
 475         .vidioc_s_ctrl      = vidioc_s_ctrl,
 476 };
 477
 478 /* V4L2 interface */
 479 static struct video_device tea5764_radio_template = {
 480         .name           = "TEA5764 FM-Radio",
 481         .fops           = &tea5764_fops,
 482         .ioctl_ops      = &tea5764_ioctl_ops,
 483         .release        = video_device_release,
 484 };
 485
 486 /* I2C probe: check if the device exists and register with v4l if it is */
 487 static int __devinit tea5764_i2c_probe(struct i2c_client *client,
 488                                         const struct i2c_device_id *id)
 489 {
 490         struct tea5764_device *radio;
 491         struct tea5764_regs *r;
 492         int ret;
 493
 494         PDEBUG("probe");
 495         radio = kzalloc(sizeof(struct tea5764_device), GFP_KERNEL);
 496         if (!radio)
 497                 return -ENOMEM;
 498
 499         mutex_init(&radio->mutex);
 500         radio->i2c_client = client;
 501         ret = tea5764_i2c_read(radio);
 502         if (ret)
 503                 goto errfr;
 504         r = &radio->regs;
 505         PDEBUG("chipid = %04X, manid = %04X", r->chipid, r->manid);
 506         if (r->chipid != TEA5764_CHIPID ||
 507                 (r->manid & 0x0fff) != TEA5764_MANID) {
 508                 PWARN("This chip is not a TEA5764!");
 509                 ret = -EINVAL;
 510                 goto errfr;
 511         }
 512
 513         radio->videodev = video_device_alloc();
 514         if (!(radio->videodev)) {
 515                 ret = -ENOMEM;
 516                 goto errfr;
 517         }
 518         memcpy(radio->videodev, &tea5764_radio_template,
 519                 sizeof(tea5764_radio_template));
 520
 521         i2c_set_clientdata(client, radio);
 522         video_set_drvdata(radio->videodev, radio);
 523         radio->videodev->lock = &radio->mutex;
 524
 525         /* initialize and power off the chip */
 526         tea5764_i2c_read(radio);
 527         tea5764_set_audout_mode(radio, V4L2_TUNER_MODE_STEREO);
 528         tea5764_mute(radio, 1);
 529         tea5764_power_down(radio);
 530
 531         ret = video_register_device(radio->videodev, VFL_TYPE_RADIO, radio_nr);
 532         if (ret < 0) {
 533                 PWARN("Could not register video device!");
 534                 goto errrel;
 535         }
 536
 537         PINFO("registered.");
 538         return 0;
 539 errrel:
 540         video_device_release(radio->videodev);
 541 errfr:
 542         kfree(radio);
 543         return ret;
 544 }
 545
 546 static int __devexit tea5764_i2c_remove(struct i2c_client *client)
 547 {
 548         struct tea5764_device *radio = i2c_get_clientdata(client);
 549
 550         PDEBUG("remove");
 551         if (radio) {
 552                 tea5764_power_down(radio);
 553                 video_unregister_device(radio->videodev);
 554                 kfree(radio);
 555         }
 556         return 0;
 557 }
 558
 559 /* I2C subsystem interface */
 560 static const struct i2c_device_id tea5764_id[] = {
 561         { "radio-tea5764", 0 },
 562         { }                                     /* Terminating entry */
 563 };
 564 MODULE_DEVICE_TABLE(i2c, tea5764_id);
 565
 566 static struct i2c_driver tea5764_i2c_driver = {
 567         .driver = {
 568                 .name = "radio-tea5764",
 569                 .owner = THIS_MODULE,
 570         },
 571         .probe = tea5764_i2c_probe,
 572         .remove = __devexit_p(tea5764_i2c_remove),
 573         .id_table = tea5764_id,
 574 };
 575
 576 /* init the driver */
 577 static int __init tea5764_init(void)
 578 {
 579         int ret = i2c_add_driver(&tea5764_i2c_driver);
 580
 581         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ": "
 582                 DRIVER_DESC "\n");
 583         return ret;
 584 }
 585
 586 /* cleanup the driver */
 587 static void __exit tea5764_exit(void)
 588 {
 589         i2c_del_driver(&tea5764_i2c_driver);
 590 }
 591
 592 MODULE_AUTHOR(DRIVER_AUTHOR);
 593 MODULE_DESCRIPTION(DRIVER_DESC);
 594 MODULE_LICENSE("GPL");
 595 MODULE_VERSION(DRIVER_VERSION);
 596
 597 module_param(use_xtal, int, 0);
 598 MODULE_PARM_DESC(use_xtal, "Chip have a xtal connected in board");
 599 module_param(radio_nr, int, 0);
 600 MODULE_PARM_DESC(radio_nr, "video4linux device number to use");
 601
 602 module_init(tea5764_init);
 603 module_exit(tea5764_exit);