drivers/media/radio/radio-miropcm20.c

   1 /*
   2  * Miro PCM20 radio driver for Linux radio support
   3  * (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
   4  * Thanks to Norberto Pellici for the ACI device interface specification
   5  * The API part is based on the radiotrack driver by M. Kirkwood
   6  * This driver relies on the aci mixer provided by the snd-miro
   7  * ALSA driver.
   8  * Look there for further info...
   9  *
  10  * From the original miro RDS sources:
  11  *
  12  *  (c) 2001 Robert Siemer <Robert.Siemer@gmx.de>
  13  *
  14  *  Many thanks to Fred Seidel <seidel@metabox.de>, the
  15  *  designer of the RDS decoder hardware. With his help
  16  *  I was able to code this driver.
  17  *  Thanks also to Norberto Pellicci, Dominic Mounteney
  18  *  <DMounteney@pinnaclesys.com> and www.teleauskunft.de
  19  *  for good hints on finding Fred. It was somewhat hard
  20  *  to locate him here in Germany... [:
  21  *
  22  * This code has been reintroduced and converted to use
  23  * the new V4L2 RDS API by:
  24  *
  25  * Hans Verkuil <hans.verkuil@cisco.com>
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/io.h>
  31 #include <linux/delay.h>
  32 #include <linux/videodev2.h>
  33 #include <linux/kthread.h>
  34 #include <media/v4l2-device.h>
  35 #include <media/v4l2-ioctl.h>
  36 #include <media/v4l2-ctrls.h>
  37 #include <media/v4l2-fh.h>
  38 #include <media/v4l2-event.h>
  39 #include <sound/aci.h>
  40
  41 #define RDS_DATASHIFT          2   /* Bit 2 */
  42 #define RDS_DATAMASK        (1 << RDS_DATASHIFT)
  43 #define RDS_BUSYMASK        0x10   /* Bit 4 */
  44 #define RDS_CLOCKMASK       0x08   /* Bit 3 */
  45 #define RDS_DATA(x)         (((x) >> RDS_DATASHIFT) & 1)
  46
  47 #define RDS_STATUS      0x01
  48 #define RDS_STATIONNAME 0x02
  49 #define RDS_TEXT        0x03
  50 #define RDS_ALTFREQ     0x04
  51 #define RDS_TIMEDATE    0x05
  52 #define RDS_PI_CODE     0x06
  53 #define RDS_PTYTATP     0x07
  54 #define RDS_RESET       0x08
  55 #define RDS_RXVALUE     0x09
  56
  57 static int radio_nr = -1;
  58 module_param(radio_nr, int, 0);
  59 MODULE_PARM_DESC(radio_nr, "Set radio device number (/dev/radioX).  Default: -1 (autodetect)");
  60
  61 struct pcm20 {
  62         struct v4l2_device v4l2_dev;
  63         struct video_device vdev;
  64         struct v4l2_ctrl_handler ctrl_handler;
  65         struct v4l2_ctrl *rds_pty;
  66         struct v4l2_ctrl *rds_ps_name;
  67         struct v4l2_ctrl *rds_radio_test;
  68         struct v4l2_ctrl *rds_ta;
  69         struct v4l2_ctrl *rds_tp;
  70         struct v4l2_ctrl *rds_ms;
  71         /* thread for periodic RDS status checking */
  72         struct task_struct *kthread;
  73         unsigned long freq;
  74         u32 audmode;
  75         struct snd_miro_aci *aci;
  76         struct mutex lock;
  77 };
  78
  79 static struct pcm20 pcm20_card = {
  80         .freq = 87 * 16000,
  81         .audmode = V4L2_TUNER_MODE_STEREO,
  82 };
  83
  84
  85 static int rds_waitread(struct snd_miro_aci *aci)
  86 {
  87         u8 byte;
  88         int i = 2000;
  89
  90         do {
  91                 byte = inb(aci->aci_port + ACI_REG_RDS);
  92                 i--;
  93         } while ((byte & RDS_BUSYMASK) && i);
  94
  95         /*
  96          * It's magic, but without this the data that you read later on
  97          * is unreliable and full of bit errors. With this 1 usec delay
  98          * everything is fine.
  99          */
 100         udelay(1);
 101         return i ? byte : -1;
 102 }
 103
 104 static int rds_rawwrite(struct snd_miro_aci *aci, u8 byte)
 105 {
 106         if (rds_waitread(aci) >= 0) {
 107                 outb(byte, aci->aci_port + ACI_REG_RDS);
 108                 return 0;
 109         }
 110         return -1;
 111 }
 112
 113 static int rds_write(struct snd_miro_aci *aci, u8 byte)
 114 {
 115         u8 sendbuffer[8];
 116         int i;
 117
 118         for (i = 7; i >= 0; i--)
 119                 sendbuffer[7 - i] = (byte & (1 << i)) ? RDS_DATAMASK : 0;
 120         sendbuffer[0] |= RDS_CLOCKMASK;
 121
 122         for (i = 0; i < 8; i++)
 123                 rds_rawwrite(aci, sendbuffer[i]);
 124         return 0;
 125 }
 126
 127 static int rds_readcycle_nowait(struct snd_miro_aci *aci)
 128 {
 129         outb(0, aci->aci_port + ACI_REG_RDS);
 130         return rds_waitread(aci);
 131 }
 132
 133 static int rds_readcycle(struct snd_miro_aci *aci)
 134 {
 135         if (rds_rawwrite(aci, 0) < 0)
 136                 return -1;
 137         return rds_waitread(aci);
 138 }
 139
 140 static int rds_ack(struct snd_miro_aci *aci)
 141 {
 142         int i = rds_readcycle(aci);
 143
 144         if (i < 0)
 145                 return -1;
 146         if (i & RDS_DATAMASK)
 147                 return 0;  /* ACK  */
 148         return 1;  /* NACK */
 149 }
 150
 151 static int rds_cmd(struct snd_miro_aci *aci, u8 cmd, u8 databuffer[], u8 datasize)
 152 {
 153         int i, j;
 154
 155         rds_write(aci, cmd);
 156
 157         /* RDS_RESET doesn't need further processing */
 158         if (cmd == RDS_RESET)
 159                 return 0;
 160         if (rds_ack(aci))
 161                 return -EIO;
 162         if (datasize == 0)
 163                 return 0;
 164
 165         /* to be able to use rds_readcycle_nowait()
 166            I have to waitread() here */
 167         if (rds_waitread(aci) < 0)
 168                 return -1;
 169
 170         memset(databuffer, 0, datasize);
 171
 172         for (i = 0; i < 8 * datasize; i++) {
 173                 j = rds_readcycle_nowait(aci);
 174                 if (j < 0)
 175                         return -EIO;
 176                 databuffer[i / 8] |= RDS_DATA(j) << (7 - (i % 8));
 177         }
 178         return 0;
 179 }
 180
 181 static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
 182 {
 183         unsigned char freql;
 184         unsigned char freqh;
 185         struct snd_miro_aci *aci = dev->aci;
 186
 187         freq /= 160;
 188         if (!(aci->aci_version == 0x07 || aci->aci_version >= 0xb0))
 189                 freq /= 10;  /* I don't know exactly which version
 190                               * needs this hack */
 191         freql = freq & 0xff;
 192         freqh = freq >> 8;
 193
 194         rds_cmd(aci, RDS_RESET, NULL, 0);
 195         return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
 196 }
 197
 198 static int vidioc_querycap(struct file *file, void *priv,
 199                                 struct v4l2_capability *v)
 200 {
 201         struct pcm20 *dev = video_drvdata(file);
 202
 203         strlcpy(v->driver, "Miro PCM20", sizeof(v->driver));
 204         strlcpy(v->card, "Miro PCM20", sizeof(v->card));
 205         snprintf(v->bus_info, sizeof(v->bus_info), "ISA:%s", dev->v4l2_dev.name);
 206         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_RDS_CAPTURE;
 207         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
 208         return 0;
 209 }
 210
 211 static bool sanitize(char *p, int size)
 212 {
 213         int i;
 214         bool ret = true;
 215
 216         for (i = 0; i < size; i++) {
 217                 if (p[i] < 32) {
 218                         p[i] = ' ';
 219                         ret = false;
 220                 }
 221         }
 222         return ret;
 223 }
 224
 225 static int vidioc_g_tuner(struct file *file, void *priv,
 226                                 struct v4l2_tuner *v)
 227 {
 228         struct pcm20 *dev = video_drvdata(file);
 229         int res;
 230         u8 buf;
 231
 232         if (v->index)
 233                 return -EINVAL;
 234         strlcpy(v->name, "FM", sizeof(v->name));
 235         v->type = V4L2_TUNER_RADIO;
 236         v->rangelow = 87*16000;
 237         v->rangehigh = 108*16000;
 238         res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTATION, -1, -1);
 239         v->signal = (res & 0x80) ? 0 : 0xffff;
 240         /* Note: stereo detection does not work if the audio is muted,
 241            it will default to mono in that case. */
 242         res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTEREO, -1, -1);
 243         v->rxsubchans = (res & 0x40) ? V4L2_TUNER_SUB_MONO :
 244                                         V4L2_TUNER_SUB_STEREO;
 245         v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
 246                         V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_CONTROLS;
 247         v->audmode = dev->audmode;
 248         res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
 249         if (res >= 0 && buf)
 250                 v->rxsubchans |= V4L2_TUNER_SUB_RDS;
 251         return 0;
 252 }
 253
 254 static int vidioc_s_tuner(struct file *file, void *priv,
 255                                 const struct v4l2_tuner *v)
 256 {
 257         struct pcm20 *dev = video_drvdata(file);
 258
 259         if (v->index)
 260                 return -EINVAL;
 261         if (v->audmode > V4L2_TUNER_MODE_STEREO)
 262                 dev->audmode = V4L2_TUNER_MODE_STEREO;
 263         else
 264                 dev->audmode = v->audmode;
 265         snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
 266                         dev->audmode == V4L2_TUNER_MODE_MONO, -1);
 267         return 0;
 268 }
 269
 270 static int vidioc_g_frequency(struct file *file, void *priv,
 271                                 struct v4l2_frequency *f)
 272 {
 273         struct pcm20 *dev = video_drvdata(file);
 274
 275         if (f->tuner != 0)
 276                 return -EINVAL;
 277
 278         f->type = V4L2_TUNER_RADIO;
 279         f->frequency = dev->freq;
 280         return 0;
 281 }
 282
 283
 284 static int vidioc_s_frequency(struct file *file, void *priv,
 285                                 const struct v4l2_frequency *f)
 286 {
 287         struct pcm20 *dev = video_drvdata(file);
 288
 289         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 290                 return -EINVAL;
 291
 292         dev->freq = clamp_t(u32, f->frequency, 87 * 16000U, 108 * 16000U);
 293         pcm20_setfreq(dev, dev->freq);
 294         return 0;
 295 }
 296
 297 static int pcm20_s_ctrl(struct v4l2_ctrl *ctrl)
 298 {
 299         struct pcm20 *dev = container_of(ctrl->handler, struct pcm20, ctrl_handler);
 300
 301         switch (ctrl->id) {
 302         case V4L2_CID_AUDIO_MUTE:
 303                 snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, ctrl->val, -1);
 304                 return 0;
 305         }
 306         return -EINVAL;
 307 }
 308
 309 static int pcm20_thread(void *data)
 310 {
 311         struct pcm20 *dev = data;
 312         const unsigned no_rds_start_counter = 5;
 313         const unsigned sleep_msecs = 2000;
 314         unsigned no_rds_counter = no_rds_start_counter;
 315
 316         for (;;) {
 317                 char text_buffer[66];
 318                 u8 buf;
 319                 int res;
 320
 321                 msleep_interruptible(sleep_msecs);
 322
 323                 if (kthread_should_stop())
 324                         break;
 325
 326                 res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
 327                 if (res)
 328                         continue;
 329                 if (buf == 0) {
 330                         if (no_rds_counter == 0)
 331                                 continue;
 332                         no_rds_counter--;
 333                         if (no_rds_counter)
 334                                 continue;
 335
 336                         /*
 337                          * No RDS seen for no_rds_start_counter * sleep_msecs
 338                          * milliseconds, clear all RDS controls to their
 339                          * default values.
 340                          */
 341                         v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, "");
 342                         v4l2_ctrl_s_ctrl(dev->rds_ms, 1);
 343                         v4l2_ctrl_s_ctrl(dev->rds_ta, 0);
 344                         v4l2_ctrl_s_ctrl(dev->rds_tp, 0);
 345                         v4l2_ctrl_s_ctrl(dev->rds_pty, 0);
 346                         v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, "");
 347                         continue;
 348                 }
 349                 no_rds_counter = no_rds_start_counter;
 350
 351                 res = rds_cmd(dev->aci, RDS_STATUS, &buf, 1);
 352                 if (res)
 353                         continue;
 354                 if ((buf >> 3) & 1) {
 355                         res = rds_cmd(dev->aci, RDS_STATIONNAME, text_buffer, 8);
 356                         text_buffer[8] = 0;
 357                         if (!res && sanitize(text_buffer, 8))
 358                                 v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, text_buffer);
 359                 }
 360                 if ((buf >> 6) & 1) {
 361                         u8 pty;
 362
 363                         res = rds_cmd(dev->aci, RDS_PTYTATP, &pty, 1);
 364                         if (!res) {
 365                                 v4l2_ctrl_s_ctrl(dev->rds_ms, !!(pty & 0x01));
 366                                 v4l2_ctrl_s_ctrl(dev->rds_ta, !!(pty & 0x02));
 367                                 v4l2_ctrl_s_ctrl(dev->rds_tp, !!(pty & 0x80));
 368                                 v4l2_ctrl_s_ctrl(dev->rds_pty, (pty >> 2) & 0x1f);
 369                         }
 370                 }
 371                 if ((buf >> 4) & 1) {
 372                         res = rds_cmd(dev->aci, RDS_TEXT, text_buffer, 65);
 373                         text_buffer[65] = 0;
 374                         if (!res && sanitize(text_buffer + 1, 64))
 375                                 v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, text_buffer + 1);
 376                 }
 377         }
 378         return 0;
 379 }
 380
 381 static int pcm20_open(struct file *file)
 382 {
 383         struct pcm20 *dev = video_drvdata(file);
 384         int res = v4l2_fh_open(file);
 385
 386         if (!res && v4l2_fh_is_singular_file(file) &&
 387             IS_ERR_OR_NULL(dev->kthread)) {
 388                 dev->kthread = kthread_run(pcm20_thread, dev, "%s",
 389                                            dev->v4l2_dev.name);
 390                 if (IS_ERR(dev->kthread)) {
 391                         v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
 392                         v4l2_fh_release(file);
 393                         return PTR_ERR(dev->kthread);
 394                 }
 395         }
 396         return res;
 397 }
 398
 399 static int pcm20_release(struct file *file)
 400 {
 401         struct pcm20 *dev = video_drvdata(file);
 402
 403         if (v4l2_fh_is_singular_file(file) && !IS_ERR_OR_NULL(dev->kthread)) {
 404                 kthread_stop(dev->kthread);
 405                 dev->kthread = NULL;
 406         }
 407         return v4l2_fh_release(file);
 408 }
 409
 410 static const struct v4l2_file_operations pcm20_fops = {
 411         .owner          = THIS_MODULE,
 412         .open           = pcm20_open,
 413         .poll           = v4l2_ctrl_poll,
 414         .release        = pcm20_release,
 415         .unlocked_ioctl = video_ioctl2,
 416 };
 417
 418 static const struct v4l2_ioctl_ops pcm20_ioctl_ops = {
 419         .vidioc_querycap    = vidioc_querycap,
 420         .vidioc_g_tuner     = vidioc_g_tuner,
 421         .vidioc_s_tuner     = vidioc_s_tuner,
 422         .vidioc_g_frequency = vidioc_g_frequency,
 423         .vidioc_s_frequency = vidioc_s_frequency,
 424         .vidioc_log_status  = v4l2_ctrl_log_status,
 425         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 426         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 427 };
 428
 429 static const struct v4l2_ctrl_ops pcm20_ctrl_ops = {
 430         .s_ctrl = pcm20_s_ctrl,
 431 };
 432
 433 static int __init pcm20_init(void)
 434 {
 435         struct pcm20 *dev = &pcm20_card;
 436         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 437         struct v4l2_ctrl_handler *hdl;
 438         int res;
 439
 440         dev->aci = snd_aci_get_aci();
 441         if (dev->aci == NULL) {
 442                 v4l2_err(v4l2_dev,
 443                          "you must load the snd-miro driver first!\n");
 444                 return -ENODEV;
 445         }
 446         strlcpy(v4l2_dev->name, "radio-miropcm20", sizeof(v4l2_dev->name));
 447         mutex_init(&dev->lock);
 448
 449         res = v4l2_device_register(NULL, v4l2_dev);
 450         if (res < 0) {
 451                 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
 452                 return -EINVAL;
 453         }
 454
 455         hdl = &dev->ctrl_handler;
 456         v4l2_ctrl_handler_init(hdl, 7);
 457         v4l2_ctrl_new_std(hdl, &pcm20_ctrl_ops,
 458                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 459         dev->rds_pty = v4l2_ctrl_new_std(hdl, NULL,
 460                         V4L2_CID_RDS_RX_PTY, 0, 0x1f, 1, 0);
 461         dev->rds_ps_name = v4l2_ctrl_new_std(hdl, NULL,
 462                         V4L2_CID_RDS_RX_PS_NAME, 0, 8, 8, 0);
 463         dev->rds_radio_test = v4l2_ctrl_new_std(hdl, NULL,
 464                         V4L2_CID_RDS_RX_RADIO_TEXT, 0, 64, 64, 0);
 465         dev->rds_ta = v4l2_ctrl_new_std(hdl, NULL,
 466                         V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT, 0, 1, 1, 0);
 467         dev->rds_tp = v4l2_ctrl_new_std(hdl, NULL,
 468                         V4L2_CID_RDS_RX_TRAFFIC_PROGRAM, 0, 1, 1, 0);
 469         dev->rds_ms = v4l2_ctrl_new_std(hdl, NULL,
 470                         V4L2_CID_RDS_RX_MUSIC_SPEECH, 0, 1, 1, 1);
 471         v4l2_dev->ctrl_handler = hdl;
 472         if (hdl->error) {
 473                 res = hdl->error;
 474                 v4l2_err(v4l2_dev, "Could not register control\n");
 475                 goto err_hdl;
 476         }
 477         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 478         dev->vdev.v4l2_dev = v4l2_dev;
 479         dev->vdev.fops = &pcm20_fops;
 480         dev->vdev.ioctl_ops = &pcm20_ioctl_ops;
 481         dev->vdev.release = video_device_release_empty;
 482         dev->vdev.lock = &dev->lock;
 483         video_set_drvdata(&dev->vdev, dev);
 484         snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
 485                         dev->audmode == V4L2_TUNER_MODE_MONO, -1);
 486         pcm20_setfreq(dev, dev->freq);
 487
 488         if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0)
 489                 goto err_hdl;
 490
 491         v4l2_info(v4l2_dev, "Mirosound PCM20 Radio tuner\n");
 492         return 0;
 493 err_hdl:
 494         v4l2_ctrl_handler_free(hdl);
 495         v4l2_device_unregister(v4l2_dev);
 496         return -EINVAL;
 497 }
 498
 499 MODULE_AUTHOR("Ruurd Reitsma, Krzysztof Helt");
 500 MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
 501 MODULE_LICENSE("GPL");
 502
 503 static void __exit pcm20_cleanup(void)
 504 {
 505         struct pcm20 *dev = &pcm20_card;
 506
 507         video_unregister_device(&dev->vdev);
 508         snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, 1, -1);
 509         v4l2_ctrl_handler_free(&dev->ctrl_handler);
 510         v4l2_device_unregister(&dev->v4l2_dev);
 511 }
 512
 513 module_init(pcm20_init);
 514 module_exit(pcm20_cleanup);