drivers/media/radio/radio-maxiradio.c

   1 /*
   2  * Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux
   3  * (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
   4  *
   5  * Based in the radio Maestro PCI driver. Actually it uses the same chip
   6  * for radio but different pci controller.
   7  *
   8  * I didn't have any specs I reversed engineered the protocol from
   9  * the windows driver (radio.dll).
  10  *
  11  * The card uses the TEA5757 chip that includes a search function but it
  12  * is useless as I haven't found any way to read back the frequency. If
  13  * anybody does please mail me.
  14  *
  15  * For the pdf file see:
  16  * http://www.semiconductors.philips.com/pip/TEA5757H/V1
  17  *
  18  *
  19  * CHANGES:
  20  *   0.75b
  21  *     - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
  22  *
  23  *   0.75      Sun Feb  4 22:51:27 EET 2001
  24  *     - tiding up
  25  *     - removed support for multiple devices as it didn't work anyway
  26  *
  27  * BUGS:
  28  *   - card unmutes if you change frequency
  29  *
  30  * (c) 2006, 2007 by Mauro Carvalho Chehab <mchehab@infradead.org>:
  31  *      - Conversion to V4L2 API
  32  *      - Uses video_ioctl2 for parsing and to add debug support
  33  */
  34
  35
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/ioport.h>
  39 #include <linux/delay.h>
  40 #include <linux/mutex.h>
  41 #include <linux/pci.h>
  42 #include <linux/videodev2.h>
  43 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  44 #include <linux/io.h>
  45 #include <media/v4l2-device.h>
  46 #include <media/v4l2-ioctl.h>
  47
  48 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
  49 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
  50 MODULE_LICENSE("GPL");
  51
  52 static int radio_nr = -1;
  53 module_param(radio_nr, int, 0);
  54
  55 static int debug;
  56
  57 module_param(debug, int, 0644);
  58 MODULE_PARM_DESC(debug, "activates debug info");
  59
  60 #define DRIVER_VERSION  "0.77"
  61
  62 #define RADIO_VERSION KERNEL_VERSION(0, 7, 7)
  63
  64 #define dprintk(dev, num, fmt, arg...) \
  65         v4l2_dbg(num, debug, &dev->v4l2_dev, fmt, ## arg)
  66
  67 #ifndef PCI_VENDOR_ID_GUILLEMOT
  68 #define PCI_VENDOR_ID_GUILLEMOT 0x5046
  69 #endif
  70
  71 #ifndef PCI_DEVICE_ID_GUILLEMOT
  72 #define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
  73 #endif
  74
  75
  76 /* TEA5757 pin mappings */
  77 static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16;
  78
  79 #define FREQ_LO         (50 * 16000)
  80 #define FREQ_HI         (150 * 16000)
  81
  82 #define FREQ_IF         171200 /* 10.7*16000   */
  83 #define FREQ_STEP       200    /* 12.5*16      */
  84
  85 /* (x==fmhz*16*1000) -> bits */
  86 #define FREQ2BITS(x) \
  87   ((((unsigned int)(x) + FREQ_IF + (FREQ_STEP << 1)) / (FREQ_STEP << 2)) << 2)
  88
  89 #define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)
  90
  91
  92 struct maxiradio
  93 {
  94         struct v4l2_device v4l2_dev;
  95         struct video_device vdev;
  96         struct pci_dev *pdev;
  97
  98         u16     io;     /* base of radio io */
  99         u16     muted;  /* VIDEO_AUDIO_MUTE */
 100         u16     stereo; /* VIDEO_TUNER_STEREO_ON */
 101         u16     tuned;  /* signal strength (0 or 0xffff) */
 102
 103         unsigned long freq;
 104
 105         struct mutex lock;
 106 };
 107
 108 static inline struct maxiradio *to_maxiradio(struct v4l2_device *v4l2_dev)
 109 {
 110         return container_of(v4l2_dev, struct maxiradio, v4l2_dev);
 111 }
 112
 113 static void outbit(unsigned long bit, u16 io)
 114 {
 115         int val = power | wren | (bit ? data : 0);
 116
 117         outb(val, io);
 118         udelay(4);
 119         outb(val | clk, io);
 120         udelay(4);
 121         outb(val, io);
 122         udelay(4);
 123 }
 124
 125 static void turn_power(struct maxiradio *dev, int p)
 126 {
 127         if (p != 0) {
 128                 dprintk(dev, 1, "Radio powered on\n");
 129                 outb(power, dev->io);
 130         } else {
 131                 dprintk(dev, 1, "Radio powered off\n");
 132                 outb(0, dev->io);
 133         }
 134 }
 135
 136 static void set_freq(struct maxiradio *dev, u32 freq)
 137 {
 138         unsigned long int si;
 139         int bl;
 140         int io = dev->io;
 141         int val = FREQ2BITS(freq);
 142
 143         /* TEA5757 shift register bits (see pdf) */
 144
 145         outbit(0, io); /* 24  search */
 146         outbit(1, io); /* 23  search up/down */
 147
 148         outbit(0, io); /* 22  stereo/mono */
 149
 150         outbit(0, io); /* 21  band */
 151         outbit(0, io); /* 20  band (only 00=FM works I think) */
 152
 153         outbit(0, io); /* 19  port ? */
 154         outbit(0, io); /* 18  port ? */
 155
 156         outbit(0, io); /* 17  search level */
 157         outbit(0, io); /* 16  search level */
 158
 159         si = 0x8000;
 160         for (bl = 1; bl <= 16; bl++) {
 161                 outbit(val & si, io);
 162                 si >>= 1;
 163         }
 164
 165         dprintk(dev, 1, "Radio freq set to %d.%02d MHz\n",
 166                                 freq / 16000,
 167                                 freq % 16000 * 100 / 16000);
 168
 169         turn_power(dev, 1);
 170 }
 171
 172 static int get_stereo(u16 io)
 173 {
 174         outb(power,io);
 175         udelay(4);
 176
 177         return !(inb(io) & mo_st);
 178 }
 179
 180 static int get_tune(u16 io)
 181 {
 182         outb(power+clk,io);
 183         udelay(4);
 184
 185         return !(inb(io) & mo_st);
 186 }
 187
 188
 189 static int vidioc_querycap(struct file *file, void  *priv,
 190                             struct v4l2_capability *v)
 191 {
 192         struct maxiradio *dev = video_drvdata(file);
 193
 194         strlcpy(v->driver, "radio-maxiradio", sizeof(v->driver));
 195         strlcpy(v->card, "Maxi Radio FM2000 radio", sizeof(v->card));
 196         snprintf(v->bus_info, sizeof(v->bus_info), "PCI:%s", pci_name(dev->pdev));
 197         v->version = RADIO_VERSION;
 198         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 199         return 0;
 200 }
 201
 202 static int vidioc_g_tuner(struct file *file, void *priv,
 203                            struct v4l2_tuner *v)
 204 {
 205         struct maxiradio *dev = video_drvdata(file);
 206
 207         if (v->index > 0)
 208                 return -EINVAL;
 209
 210         mutex_lock(&dev->lock);
 211         strlcpy(v->name, "FM", sizeof(v->name));
 212         v->type = V4L2_TUNER_RADIO;
 213         v->rangelow = FREQ_LO;
 214         v->rangehigh = FREQ_HI;
 215         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 216         v->capability = V4L2_TUNER_CAP_LOW;
 217         if (get_stereo(dev->io))
 218                 v->audmode = V4L2_TUNER_MODE_STEREO;
 219         else
 220                 v->audmode = V4L2_TUNER_MODE_MONO;
 221         v->signal = 0xffff * get_tune(dev->io);
 222         mutex_unlock(&dev->lock);
 223
 224         return 0;
 225 }
 226
 227 static int vidioc_s_tuner(struct file *file, void *priv,
 228                            struct v4l2_tuner *v)
 229 {
 230         return v->index ? -EINVAL : 0;
 231 }
 232
 233 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 234 {
 235         *i = 0;
 236         return 0;
 237 }
 238
 239 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 240 {
 241         return i ? -EINVAL : 0;
 242 }
 243
 244 static int vidioc_g_audio(struct file *file, void *priv,
 245                            struct v4l2_audio *a)
 246 {
 247         a->index = 0;
 248         strlcpy(a->name, "Radio", sizeof(a->name));
 249         a->capability = V4L2_AUDCAP_STEREO;
 250         return 0;
 251 }
 252
 253
 254 static int vidioc_s_audio(struct file *file, void *priv,
 255                            struct v4l2_audio *a)
 256 {
 257         return a->index ? -EINVAL : 0;
 258 }
 259
 260 static int vidioc_s_frequency(struct file *file, void *priv,
 261                                struct v4l2_frequency *f)
 262 {
 263         struct maxiradio *dev = video_drvdata(file);
 264
 265         if (f->frequency < FREQ_LO || f->frequency > FREQ_HI) {
 266                 dprintk(dev, 1, "radio freq (%d.%02d MHz) out of range (%d-%d)\n",
 267                                         f->frequency / 16000,
 268                                         f->frequency % 16000 * 100 / 16000,
 269                                         FREQ_LO / 16000, FREQ_HI / 16000);
 270
 271                 return -EINVAL;
 272         }
 273
 274         mutex_lock(&dev->lock);
 275         dev->freq = f->frequency;
 276         set_freq(dev, dev->freq);
 277         msleep(125);
 278         mutex_unlock(&dev->lock);
 279
 280         return 0;
 281 }
 282
 283 static int vidioc_g_frequency(struct file *file, void *priv,
 284                                struct v4l2_frequency *f)
 285 {
 286         struct maxiradio *dev = video_drvdata(file);
 287
 288         f->type = V4L2_TUNER_RADIO;
 289         f->frequency = dev->freq;
 290
 291         dprintk(dev, 4, "radio freq is %d.%02d MHz",
 292                                 f->frequency / 16000,
 293                                 f->frequency % 16000 * 100 / 16000);
 294
 295         return 0;
 296 }
 297
 298 static int vidioc_queryctrl(struct file *file, void *priv,
 299                              struct v4l2_queryctrl *qc)
 300 {
 301         switch (qc->id) {
 302         case V4L2_CID_AUDIO_MUTE:
 303                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 304         }
 305         return -EINVAL;
 306 }
 307
 308 static int vidioc_g_ctrl(struct file *file, void *priv,
 309                 struct v4l2_control *ctrl)
 310 {
 311         struct maxiradio *dev = video_drvdata(file);
 312
 313         switch (ctrl->id) {
 314         case V4L2_CID_AUDIO_MUTE:
 315                 ctrl->value = dev->muted;
 316                 return 0;
 317         }
 318
 319         return -EINVAL;
 320 }
 321
 322 static int vidioc_s_ctrl(struct file *file, void *priv,
 323                 struct v4l2_control *ctrl)
 324 {
 325         struct maxiradio *dev = video_drvdata(file);
 326
 327         switch (ctrl->id) {
 328         case V4L2_CID_AUDIO_MUTE:
 329                 mutex_lock(&dev->lock);
 330                 dev->muted = ctrl->value;
 331                 if (dev->muted)
 332                         turn_power(dev, 0);
 333                 else
 334                         set_freq(dev, dev->freq);
 335                 mutex_unlock(&dev->lock);
 336                 return 0;
 337         }
 338
 339         return -EINVAL;
 340 }
 341
 342 static const struct v4l2_file_operations maxiradio_fops = {
 343         .owner          = THIS_MODULE,
 344         .ioctl          = video_ioctl2,
 345 };
 346
 347 static const struct v4l2_ioctl_ops maxiradio_ioctl_ops = {
 348         .vidioc_querycap    = vidioc_querycap,
 349         .vidioc_g_tuner     = vidioc_g_tuner,
 350         .vidioc_s_tuner     = vidioc_s_tuner,
 351         .vidioc_g_audio     = vidioc_g_audio,
 352         .vidioc_s_audio     = vidioc_s_audio,
 353         .vidioc_g_input     = vidioc_g_input,
 354         .vidioc_s_input     = vidioc_s_input,
 355         .vidioc_g_frequency = vidioc_g_frequency,
 356         .vidioc_s_frequency = vidioc_s_frequency,
 357         .vidioc_queryctrl   = vidioc_queryctrl,
 358         .vidioc_g_ctrl      = vidioc_g_ctrl,
 359         .vidioc_s_ctrl      = vidioc_s_ctrl,
 360 };
 361
 362 static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 363 {
 364         struct maxiradio *dev;
 365         struct v4l2_device *v4l2_dev;
 366         int retval = -ENOMEM;
 367
 368         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 369         if (dev == NULL) {
 370                 dev_err(&pdev->dev, "not enough memory\n");
 371                 return -ENOMEM;
 372         }
 373
 374         v4l2_dev = &dev->v4l2_dev;
 375         mutex_init(&dev->lock);
 376         dev->pdev = pdev;
 377         dev->muted = 1;
 378         dev->freq = FREQ_LO;
 379
 380         strlcpy(v4l2_dev->name, "maxiradio", sizeof(v4l2_dev->name));
 381
 382         retval = v4l2_device_register(&pdev->dev, v4l2_dev);
 383         if (retval < 0) {
 384                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 385                 goto errfr;
 386         }
 387
 388         if (!request_region(pci_resource_start(pdev, 0),
 389                            pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 390                 v4l2_err(v4l2_dev, "can't reserve I/O ports\n");
 391                 goto err_out;
 392         }
 393
 394         if (pci_enable_device(pdev))
 395                 goto err_out_free_region;
 396
 397         dev->io = pci_resource_start(pdev, 0);
 398         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 399         dev->vdev.v4l2_dev = v4l2_dev;
 400         dev->vdev.fops = &maxiradio_fops;
 401         dev->vdev.ioctl_ops = &maxiradio_ioctl_ops;
 402         dev->vdev.release = video_device_release_empty;
 403         video_set_drvdata(&dev->vdev, dev);
 404
 405         if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 406                 v4l2_err(v4l2_dev, "can't register device!");
 407                 goto err_out_free_region;
 408         }
 409
 410         v4l2_info(v4l2_dev, "version " DRIVER_VERSION
 411                         " time " __TIME__ "  " __DATE__ "\n");
 412
 413         v4l2_info(v4l2_dev, "found Guillemot MAXI Radio device (io = 0x%x)\n",
 414                dev->io);
 415         return 0;
 416
 417 err_out_free_region:
 418         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 419 err_out:
 420         v4l2_device_unregister(v4l2_dev);
 421 errfr:
 422         kfree(dev);
 423         return -ENODEV;
 424 }
 425
 426 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 427 {
 428         struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
 429         struct maxiradio *dev = to_maxiradio(v4l2_dev);
 430
 431         video_unregister_device(&dev->vdev);
 432         v4l2_device_unregister(&dev->v4l2_dev);
 433         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 434 }
 435
 436 static struct pci_device_id maxiradio_pci_tbl[] = {
 437         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 438                 PCI_ANY_ID, PCI_ANY_ID, },
 439         { 0 }
 440 };
 441
 442 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 443
 444 static struct pci_driver maxiradio_driver = {
 445         .name           = "radio-maxiradio",
 446         .id_table       = maxiradio_pci_tbl,
 447         .probe          = maxiradio_init_one,
 448         .remove         = __devexit_p(maxiradio_remove_one),
 449 };
 450
 451 static int __init maxiradio_radio_init(void)
 452 {
 453         return pci_register_driver(&maxiradio_driver);
 454 }
 455
 456 static void __exit maxiradio_radio_exit(void)
 457 {
 458         pci_unregister_driver(&maxiradio_driver);
 459 }
 460
 461 module_init(maxiradio_radio_init);
 462 module_exit(maxiradio_radio_exit);