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
  27 #define DRIVER_NAME "tea5761"
  28
  29 #define TEA5761_VERSION         KERNEL_VERSION(0, 0, 1)
  30
  31 #define TEA5761_I2C_ADDR        0x10
  32
  33 #define TEA5761_MANID           0x002b
  34 #define TEA5761_CHIPID          0x5761
  35
  36 #define TEA5761_INTREG_BLMSK    0x0001
  37 #define TEA5761_INTREG_FRRMSK   0x0002
  38 #define TEA5761_INTREG_LEVMSK   0x0008
  39 #define TEA5761_INTREG_IFMSK    0x0010
  40 #define TEA5761_INTREG_BLMFLAG  0x0100
  41 #define TEA5761_INTREG_FRRFLAG  0x0200
  42 #define TEA5761_INTREG_LEVFLAG  0x0800
  43 #define TEA5761_INTREG_IFFLAG   0x1000
  44
  45 #define TEA5761_FRQSET_SUD      0x8000
  46 #define TEA5761_FRQSET_SM       0x4000
  47
  48 #define TEA5761_TNCTRL_PUPD0    0x4000
  49 #define TEA5761_TNCTRL_BLIM     0x2000
  50 #define TEA5761_TNCTRL_SWPM     0x1000
  51 #define TEA5761_TNCTRL_IFCTC    0x0800
  52 #define TEA5761_TNCTRL_AFM      0x0400
  53 #define TEA5761_TNCTRL_SMUTE    0x0200
  54 #define TEA5761_TNCTRL_SNC      0x0100
  55 #define TEA5761_TNCTRL_MU       0x0080
  56 #define TEA5761_TNCTRL_SSL1     0x0040
  57 #define TEA5761_TNCTRL_SSL0     0x0020
  58 #define TEA5761_TNCTRL_HLSI     0x0010
  59 #define TEA5761_TNCTRL_MST      0x0008
  60 #define TEA5761_TNCTRL_SWP      0x0004
  61 #define TEA5761_TNCTRL_DTC      0x0002
  62 #define TEA5761_TNCTRL_AHLSI    0x0001
  63
  64 #define TEA5761_TUNCHK_LEVEL(x) (((x) & 0x00F0) >> 4)
  65 #define TEA5761_TUNCHK_IFCNT(x) (((x) & 0xFE00) >> 9)
  66 #define TEA5761_TUNCHK_TUNTO    0x0100
  67 #define TEA5761_TUNCHK_LD       0x0008
  68 #define TEA5761_TUNCHK_STEREO   0x0004
  69
  70 #define TEA5761_TESTREG_TRIGFR  0x0800
  71
  72 #define TEA5761_FREQ_LOW        87500
  73 #define TEA5761_FREQ_HIGH       108000
  74
  75 struct tea5761_regs {
  76         u16 intreg;
  77         u16 frqset;
  78         u16 tnctrl;
  79         u16 frqchk;
  80         u16 tunchk;
  81         u16 testreg;
  82         u16 manid;
  83         u16 chipid;
  84 } __attribute__ ((packed));
  85
  86 struct tea5761_write_regs {
  87         u8 intreg;
  88         u16 frqset;
  89         u16 tnctrl;
  90         u16 testreg;
  91 } __attribute__ ((packed));
  92
  93 struct tea5761_device {
  94         struct video_device     *video_dev;
  95         struct i2c_client       *i2c_dev;
  96         struct tea5761_regs     regs;
  97         struct mutex            mutex;
  98         int                     users;
  99 };
 100
 101 static struct tea5761_device tea5761;
 102
 103 static struct i2c_driver        tea5761_driver;
 104 static int radio_nr = -1;
 105
 106 static int tea5761_read_regs(struct tea5761_device *tea)
 107 {
 108         int rc, i;
 109         u16 *p = (u16 *) &tea->regs;
 110         struct i2c_client *client = tea->i2c_dev;
 111
 112         rc = i2c_master_recv(client, (void*) &tea->regs, sizeof(tea->regs));
 113         for (i = 0; i < 8; i++) {
 114                 p[i] = __be16_to_cpu(p[i]);
 115         }
 116
 117         dev_dbg(&client->dev,
 118                 "chip state: %04x %04x %04x %04x %04x %04x %04x %04x\n",
 119                 p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
 120
 121         if (rc < 0)
 122                 dev_err(&client->dev, "read\n");
 123
 124         return rc;
 125 }
 126
 127 static void tea5761_write_regs(struct tea5761_device *tea)
 128 {
 129         struct tea5761_write_regs wr;
 130         struct tea5761_regs *r = &tea->regs;
 131         struct i2c_client *client = tea->i2c_dev;
 132         u8 *p = (u8 *) r;
 133
 134         wr.intreg = r->intreg & 0xff;
 135         wr.frqset = __cpu_to_be16(r->frqset);
 136         wr.tnctrl = __cpu_to_be16(r->tnctrl);
 137         wr.testreg = __cpu_to_be16(r->testreg);
 138
 139         dev_dbg(&client->dev,
 140                 "writing state: %02x %02x %02x %02x %02x %02x %02x\n",
 141                 p[0], p[1], p[2], p[3], p[4], p[5], p[6]);
 142         if (i2c_master_send(client, (void *) &wr, sizeof(wr)) < 0)
 143                 dev_err(&client->dev, "write\n");
 144 }
 145
 146 static void tea5761_power_up(struct tea5761_device *tea)
 147 {
 148         struct tea5761_regs *r = &tea->regs;
 149
 150         if (!(r->tnctrl & TEA5761_TNCTRL_PUPD0)) {
 151                 r->tnctrl &= ~(TEA5761_TNCTRL_AFM | TEA5761_TNCTRL_MU |
 152                                TEA5761_TNCTRL_HLSI);
 153                 r->testreg |= TEA5761_TESTREG_TRIGFR;
 154                 r->tnctrl |= TEA5761_TNCTRL_PUPD0;
 155                 return tea5761_write_regs(tea);
 156         }
 157 }
 158
 159 static void tea5761_power_down(struct tea5761_device *tea)
 160 {
 161         struct tea5761_regs *r = &tea->regs;
 162
 163         if (r->tnctrl & TEA5761_TNCTRL_PUPD0) {
 164                 r->tnctrl &= ~TEA5761_TNCTRL_PUPD0;
 165                 return tea5761_write_regs(tea);
 166         }
 167 }
 168
 169 static void tea5761_set_freq(struct tea5761_device *tea, int freq)
 170 {
 171         struct tea5761_regs *r = &tea->regs;
 172
 173         if (r->tnctrl & TEA5761_TNCTRL_HLSI)
 174                 r->frqset = (freq + 225000) / 8192;
 175         else
 176                 r->frqset = (freq - 225000) / 8192;
 177 }
 178
 179 static int tea5761_get_freq(struct tea5761_device *tea)
 180 {
 181         struct tea5761_regs *r = &tea->regs;
 182
 183         if (r->tnctrl & TEA5761_TNCTRL_HLSI)
 184                 return (r->frqchk * 8192) - 225000;
 185         else
 186                 return (r->frqchk * 8192) + 225000;
 187 }
 188
 189 static void tea5761_tune(struct tea5761_device *tea, int freq)
 190 {
 191         tea5761_set_freq(tea, freq);
 192         tea5761_write_regs(tea);
 193 }
 194
 195 static void tea5761_set_audout_mode(struct tea5761_device *tea, int audmode)
 196 {
 197         struct tea5761_regs *r = &tea->regs;
 198         int tnctrl = r->tnctrl;
 199
 200         if (audmode == V4L2_TUNER_MODE_MONO)
 201                 r->tnctrl |= TEA5761_TNCTRL_MST;
 202         else
 203                 r->tnctrl &= ~TEA5761_TNCTRL_MST;
 204         if (tnctrl != r->tnctrl)
 205                 tea5761_write_regs(tea);
 206 }
 207
 208 static int tea5761_get_audout_mode(struct tea5761_device *tea)
 209 {
 210         struct tea5761_regs *r = &tea->regs;
 211
 212         if (r->tnctrl & TEA5761_TNCTRL_MST)
 213                 return V4L2_TUNER_MODE_MONO;
 214         else
 215                 return V4L2_TUNER_MODE_STEREO;
 216 }
 217
 218 static void tea5761_mute(struct tea5761_device *tea, int on)
 219 {
 220         struct tea5761_regs *r = &tea->regs;
 221         int tnctrl = r->tnctrl;
 222
 223         if (on)
 224                 r->tnctrl |= TEA5761_TNCTRL_MU;
 225         else
 226                 r->tnctrl &= ~TEA5761_TNCTRL_MU;
 227         if (tnctrl != r->tnctrl)
 228                 tea5761_write_regs(tea);
 229 }
 230
 231 static int tea5761_is_muted(struct tea5761_device *tea)
 232 {
 233         return tea->regs.tnctrl & TEA5761_TNCTRL_MU;
 234 }
 235
 236 static int tea5761_do_ioctl(struct inode *inode, struct file *file,
 237                             unsigned int cmd, void *arg)
 238 {
 239         struct tea5761_device *tea = file->private_data;
 240         struct video_device *dev = tea->video_dev;
 241         struct i2c_client *client = tea->i2c_dev;
 242         struct tea5761_regs *r = &tea->regs;
 243
 244         union {
 245                 struct v4l2_capability c;
 246                 struct v4l2_tuner t;
 247                 struct v4l2_frequency f;
 248                 struct v4l2_queryctrl qc;
 249                 struct v4l2_control ct;
 250         } *u = arg;
 251
 252         tea5761_read_regs(tea);
 253
 254         switch (cmd) {
 255         case VIDIOC_QUERYCAP:
 256                 dev_dbg(&client->dev, "VIDIOC_QUERYCAP\n");
 257                 memset(&u->c, 0, sizeof(u->c));
 258                 strlcpy(u->c.driver, dev->dev->driver->name,
 259                         sizeof(u->c.driver));
 260                 strlcpy(u->c.card, dev->name, sizeof(u->c.card));
 261                 snprintf(u->c.bus_info, sizeof(u->c.bus_info), "I2C:%s",
 262                          dev->dev->bus_id);
 263                 u->c.version = TEA5761_VERSION;
 264                 u->c.capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 265                 break;
 266
 267         case VIDIOC_G_TUNER:
 268                 /* Only one tuner chip */
 269                 dev_dbg(&client->dev, "VIDIOC_G_TUNER\n");
 270                 if (u->t.index != 0)
 271                         return -EINVAL;
 272
 273                 memset(&u->t, 0, sizeof(u->t));
 274                 u->t.type = V4L2_TUNER_RADIO;
 275                 strlcpy(u->t.name, "FM", sizeof(u->t.name));
 276                 /* Freq in 62.5Hz units */
 277                 u->t.rangelow = TEA5761_FREQ_LOW * 16;
 278                 u->t.rangehigh = TEA5761_FREQ_HIGH * 16;
 279                 u->t.capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO;
 280                 if (r->tunchk & TEA5761_TUNCHK_STEREO)
 281                         u->t.rxsubchans = V4L2_TUNER_SUB_STEREO;
 282                 u->t.audmode = tea5761_get_audout_mode(tea);
 283                 u->t.signal = TEA5761_TUNCHK_LEVEL(r->tunchk) * 0xffff / 0xf;
 284                 u->t.afc = TEA5761_TUNCHK_IFCNT(r->tunchk);
 285                 break;
 286
 287         case VIDIOC_S_TUNER:
 288                 /* Only tuner nro 0 can be selected. */
 289                 dev_dbg(&client->dev, "VIDIOC_S_TUNER\n");
 290                 if (u->t.index != 0)
 291                         return -EINVAL;
 292                 tea5761_set_audout_mode(tea, u->t.audmode);
 293                 break;
 294
 295         case VIDIOC_G_FREQUENCY:
 296                 dev_dbg(&client->dev, "VIDIOC_G_FREQUENCY\n");
 297                 memset(&u->f, 0, sizeof(u->f));
 298                 u->f.type = V4L2_TUNER_RADIO;
 299                 if (r->tnctrl & TEA5761_TNCTRL_PUPD0)
 300                         u->f.frequency = (tea5761_get_freq(tea) * 2) / 125;
 301                 else
 302                         u->f.frequency = 0;
 303                 break;
 304
 305         case VIDIOC_S_FREQUENCY:
 306                 dev_dbg(&client->dev, "VIDIOC_S_FREQUENCY %u\n",
 307                         u->f.frequency);
 308                 if (u->f.tuner != 0)
 309                         return -EINVAL;
 310                 if (u->f.frequency == 0) {
 311                         /* We special case this as a power down
 312                          * control. */
 313                         tea5761_power_down(tea);
 314                         break;
 315                 }
 316                 if (u->f.frequency < 16 * TEA5761_FREQ_LOW)
 317                         return -EINVAL;
 318                 if (u->f.frequency > 16 * TEA5761_FREQ_HIGH)
 319                         return -EINVAL;
 320
 321                 tea5761_power_up(tea);
 322                 tea5761_tune(tea, (u->f.frequency * 125) / 2);
 323                 break;
 324
 325         case VIDIOC_QUERYCTRL:
 326                 dev_dbg(&client->dev, "VIDIOC_QUERYCTRL %d\n", u->qc.id);
 327                 if (u->qc.id != V4L2_CID_AUDIO_MUTE)
 328                         return -EINVAL;
 329                 strlcpy(u->qc.name, "Mute", sizeof(u->qc.name));
 330                 u->qc.minimum = 0;
 331                 u->qc.maximum = 1;
 332                 u->qc.step = 1;
 333                 u->qc.default_value = 0;
 334                 u->qc.type = V4L2_CTRL_TYPE_BOOLEAN;
 335                 break;
 336
 337         case VIDIOC_G_CTRL:
 338                 dev_dbg(&client->dev, "VIDIOC_G_CTRL %d\n", u->ct.id);
 339                 if (u->ct.id != V4L2_CID_AUDIO_MUTE)
 340                         return -EINVAL;
 341                 if (r->tnctrl & TEA5761_TNCTRL_PUPD0)
 342                         u->ct.value = tea5761_is_muted(tea) ? 1 : 0;
 343                 else
 344                         u->ct.value = 0;
 345                 break;
 346
 347         case VIDIOC_S_CTRL:
 348                 dev_dbg(&client->dev, "VIDIOC_S_CTRL %d\n", u->ct.id);
 349                 if (u->ct.id != V4L2_CID_AUDIO_MUTE)
 350                         return -EINVAL;
 351                 tea5761_mute(tea, u->ct.value);
 352                 break;
 353
 354         default:
 355                 return -ENOIOCTLCMD;
 356         }
 357
 358         return 0;
 359 }
 360
 361 static int tea5761_ioctl(struct inode *inode, struct file *file,
 362                          unsigned int cmd, unsigned long arg)
 363 {
 364         return video_usercopy(inode, file, cmd, arg, tea5761_do_ioctl);
 365 }
 366
 367 static int tea5761_open(struct inode *inode, struct file *file)
 368 {
 369         int minor = iminor(file->f_dentry->d_inode);
 370         /* Currently we support only one device */
 371         struct tea5761_device *tea = &tea5761;
 372
 373         if (tea->video_dev->minor != minor)
 374                 return -ENODEV;
 375
 376         mutex_lock(&tea->mutex);
 377         /* Only exclusive access */
 378         if (tea->users) {
 379                 mutex_unlock(&tea->mutex);
 380                 return -EBUSY;
 381         }
 382         tea->users++;
 383         mutex_unlock(&tea->mutex);
 384
 385         file->private_data = tea;
 386         return 0;
 387 }
 388
 389 static int tea5761_release(struct inode *inode, struct file *file)
 390 {
 391         struct tea5761_device *tea = file->private_data;
 392
 393         mutex_lock(&tea->mutex);
 394         tea->users--;
 395         mutex_unlock(&tea->mutex);
 396
 397         return 0;
 398 }
 399
 400 static struct file_operations tea5761_fops = {
 401         .owner          = THIS_MODULE,
 402         .open           = tea5761_open,
 403         .release        = tea5761_release,
 404         .ioctl          = tea5761_ioctl,
 405         .llseek         = no_llseek,
 406 };
 407
 408 static struct video_device tea5761_video_device = {
 409         .owner         = THIS_MODULE,
 410         .name          = "TEA5761 FM-Radio",
 411         .type          = VID_TYPE_TUNER,
 412         .fops          = &tea5761_fops,
 413         .release       = video_device_release
 414 };
 415
 416 static int tea5761_i2c_driver_probe(struct i2c_client *client,
 417                 const struct i2c_device_id *id)
 418 {
 419         struct video_device *video_dev;
 420         int err = 0;
 421         struct tea5761_device *tea = &tea5761;
 422
 423         mutex_init(&tea->mutex);
 424
 425         tea->i2c_dev = client;
 426
 427         /* V4L initialization */
 428         video_dev = video_device_alloc();
 429         if (video_dev == NULL) {
 430                 dev_err(&client->dev, "couldn't allocate memory\n");
 431                 err = -ENOMEM;
 432                 goto exit;
 433         }
 434         tea->video_dev = video_dev;
 435
 436         *video_dev = tea5761_video_device;
 437         video_dev->dev = &client->dev;
 438         i2c_set_clientdata(client, video_dev);
 439
 440         /* initialize and power off the chip */
 441         tea5761_read_regs(tea);
 442         tea5761_set_audout_mode(tea, V4L2_TUNER_MODE_STEREO);
 443         tea5761_mute(tea, 0);
 444         tea5761_power_down(tea);
 445
 446         tea5761.video_dev = video_dev;
 447         tea5761.i2c_dev = client;
 448
 449         err = video_register_device(video_dev, VFL_TYPE_RADIO, radio_nr);
 450         if (err) {
 451                 dev_err(&client->dev, "couldn't register video device\n");
 452                 goto err_video_alloc;
 453         }
 454
 455         dev_info(&client->dev, "tea5761 (version %d) detected\n",
 456                 (tea->regs.manid >> 12) & 0xf);
 457
 458         return 0;
 459
 460 err_video_alloc:
 461         video_device_release(video_dev);
 462 exit:
 463         kfree(client);
 464         return err;
 465 }
 466
 467 static int tea5761_i2c_driver_remove(struct i2c_client *client)
 468 {
 469         struct video_device *vd = i2c_get_clientdata(client);
 470
 471         video_unregister_device(vd);
 472
 473         return 0;
 474 }
 475
 476 static const struct i2c_device_id tea5761_id[] = {
 477         { DRIVER_NAME, 0 },
 478         { },
 479 };
 480 MODULE_DEVICE_TABLE(i2c, tea5761_id);
 481
 482 static struct i2c_driver tea5761_driver = {
 483         .driver = {
 484                 .name   = DRIVER_NAME,
 485         },
 486         .probe  = tea5761_i2c_driver_probe,
 487         .remove = __devexit_p(tea5761_i2c_driver_remove),
 488         .id_table = tea5761_id,
 489 };
 490
 491 static int __init tea5761_init(void)
 492 {
 493         int res;
 494
 495         if ((res = i2c_add_driver(&tea5761_driver))) {
 496                 printk(KERN_ERR DRIVER_NAME ": driver registration failed\n");
 497                 return res;
 498         }
 499
 500         return 0;
 501 }
 502
 503 static void __exit tea5761_exit(void)
 504 {
 505         i2c_del_driver(&tea5761_driver);
 506 }
 507
 508 MODULE_AUTHOR("Timo Teräs");
 509 MODULE_DESCRIPTION("I2C interface for TEA5761.");
 510 MODULE_LICENSE("GPL");
 511
 512 module_param(radio_nr, int, 0);
 513 MODULE_PARM_DESC(nr_radio, "video4linux device number to use");
 514
 515 module_init(tea5761_init)
 516 module_exit(tea5761_exit)