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.nxp.com/acrobat_download2/expired_datasheets/TEA5757_5759_3.pdf
  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/io.h>
  44 #include <linux/slab.h>
  45 #include <media/v4l2-device.h>
  46 #include <media/v4l2-ioctl.h>
  47
  48 #define DRIVER_VERSION  "0.7.8"
  49
  50
  51 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
  52 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
  53 MODULE_LICENSE("GPL");
  54 MODULE_VERSION(DRIVER_VERSION);
  55
  56 static int radio_nr = -1;
  57 module_param(radio_nr, int, 0);
  58
  59 static int debug;
  60
  61 module_param(debug, int, 0644);
  62 MODULE_PARM_DESC(debug, "activates debug info");
  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         (87 * 16000)
  80 #define FREQ_HI         (108 * 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->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 198         return 0;
 199 }
 200
 201 static int vidioc_g_tuner(struct file *file, void *priv,
 202                            struct v4l2_tuner *v)
 203 {
 204         struct maxiradio *dev = video_drvdata(file);
 205
 206         if (v->index > 0)
 207                 return -EINVAL;
 208
 209         mutex_lock(&dev->lock);
 210         strlcpy(v->name, "FM", sizeof(v->name));
 211         v->type = V4L2_TUNER_RADIO;
 212         v->rangelow = FREQ_LO;
 213         v->rangehigh = FREQ_HI;
 214         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 215         v->capability = V4L2_TUNER_CAP_LOW;
 216         if (get_stereo(dev->io))
 217                 v->audmode = V4L2_TUNER_MODE_STEREO;
 218         else
 219                 v->audmode = V4L2_TUNER_MODE_MONO;
 220         v->signal = 0xffff * get_tune(dev->io);
 221         mutex_unlock(&dev->lock);
 222
 223         return 0;
 224 }
 225
 226 static int vidioc_s_tuner(struct file *file, void *priv,
 227                            struct v4l2_tuner *v)
 228 {
 229         return v->index ? -EINVAL : 0;
 230 }
 231
 232 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 233 {
 234         *i = 0;
 235         return 0;
 236 }
 237
 238 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 239 {
 240         return i ? -EINVAL : 0;
 241 }
 242
 243 static int vidioc_g_audio(struct file *file, void *priv,
 244                            struct v4l2_audio *a)
 245 {
 246         a->index = 0;
 247         strlcpy(a->name, "Radio", sizeof(a->name));
 248         a->capability = V4L2_AUDCAP_STEREO;
 249         return 0;
 250 }
 251
 252
 253 static int vidioc_s_audio(struct file *file, void *priv,
 254                            struct v4l2_audio *a)
 255 {
 256         return a->index ? -EINVAL : 0;
 257 }
 258
 259 static int vidioc_s_frequency(struct file *file, void *priv,
 260                                struct v4l2_frequency *f)
 261 {
 262         struct maxiradio *dev = video_drvdata(file);
 263
 264         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 265                 return -EINVAL;
 266         if (f->frequency < FREQ_LO || f->frequency > FREQ_HI) {
 267                 dprintk(dev, 1, "radio freq (%d.%02d MHz) out of range (%d-%d)\n",
 268                                         f->frequency / 16000,
 269                                         f->frequency % 16000 * 100 / 16000,
 270                                         FREQ_LO / 16000, FREQ_HI / 16000);
 271
 272                 return -EINVAL;
 273         }
 274
 275         mutex_lock(&dev->lock);
 276         dev->freq = f->frequency;
 277         set_freq(dev, dev->freq);
 278         msleep(125);
 279         mutex_unlock(&dev->lock);
 280
 281         return 0;
 282 }
 283
 284 static int vidioc_g_frequency(struct file *file, void *priv,
 285                                struct v4l2_frequency *f)
 286 {
 287         struct maxiradio *dev = video_drvdata(file);
 288
 289         if (f->tuner != 0)
 290                 return -EINVAL;
 291         f->type = V4L2_TUNER_RADIO;
 292         f->frequency = dev->freq;
 293
 294         dprintk(dev, 4, "radio freq is %d.%02d MHz",
 295                                 f->frequency / 16000,
 296                                 f->frequency % 16000 * 100 / 16000);
 297
 298         return 0;
 299 }
 300
 301 static int vidioc_queryctrl(struct file *file, void *priv,
 302                              struct v4l2_queryctrl *qc)
 303 {
 304         switch (qc->id) {
 305         case V4L2_CID_AUDIO_MUTE:
 306                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 307         }
 308         return -EINVAL;
 309 }
 310
 311 static int vidioc_g_ctrl(struct file *file, void *priv,
 312                 struct v4l2_control *ctrl)
 313 {
 314         struct maxiradio *dev = video_drvdata(file);
 315
 316         switch (ctrl->id) {
 317         case V4L2_CID_AUDIO_MUTE:
 318                 ctrl->value = dev->muted;
 319                 return 0;
 320         }
 321
 322         return -EINVAL;
 323 }
 324
 325 static int vidioc_s_ctrl(struct file *file, void *priv,
 326                 struct v4l2_control *ctrl)
 327 {
 328         struct maxiradio *dev = video_drvdata(file);
 329
 330         switch (ctrl->id) {
 331         case V4L2_CID_AUDIO_MUTE:
 332                 mutex_lock(&dev->lock);
 333                 dev->muted = ctrl->value;
 334                 if (dev->muted)
 335                         turn_power(dev, 0);
 336                 else
 337                         set_freq(dev, dev->freq);
 338                 mutex_unlock(&dev->lock);
 339                 return 0;
 340         }
 341
 342         return -EINVAL;
 343 }
 344
 345 static const struct v4l2_file_operations maxiradio_fops = {
 346         .owner          = THIS_MODULE,
 347         .unlocked_ioctl = video_ioctl2,
 348 };
 349
 350 static const struct v4l2_ioctl_ops maxiradio_ioctl_ops = {
 351         .vidioc_querycap    = vidioc_querycap,
 352         .vidioc_g_tuner     = vidioc_g_tuner,
 353         .vidioc_s_tuner     = vidioc_s_tuner,
 354         .vidioc_g_audio     = vidioc_g_audio,
 355         .vidioc_s_audio     = vidioc_s_audio,
 356         .vidioc_g_input     = vidioc_g_input,
 357         .vidioc_s_input     = vidioc_s_input,
 358         .vidioc_g_frequency = vidioc_g_frequency,
 359         .vidioc_s_frequency = vidioc_s_frequency,
 360         .vidioc_queryctrl   = vidioc_queryctrl,
 361         .vidioc_g_ctrl      = vidioc_g_ctrl,
 362         .vidioc_s_ctrl      = vidioc_s_ctrl,
 363 };
 364
 365 static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 366 {
 367         struct maxiradio *dev;
 368         struct v4l2_device *v4l2_dev;
 369         int retval = -ENOMEM;
 370
 371         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 372         if (dev == NULL) {
 373                 dev_err(&pdev->dev, "not enough memory\n");
 374                 return -ENOMEM;
 375         }
 376
 377         v4l2_dev = &dev->v4l2_dev;
 378         mutex_init(&dev->lock);
 379         dev->pdev = pdev;
 380         dev->muted = 1;
 381         dev->freq = FREQ_LO;
 382
 383         strlcpy(v4l2_dev->name, "maxiradio", sizeof(v4l2_dev->name));
 384
 385         retval = v4l2_device_register(&pdev->dev, v4l2_dev);
 386         if (retval < 0) {
 387                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 388                 goto errfr;
 389         }
 390
 391         if (!request_region(pci_resource_start(pdev, 0),
 392                            pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 393                 v4l2_err(v4l2_dev, "can't reserve I/O ports\n");
 394                 goto err_out;
 395         }
 396
 397         if (pci_enable_device(pdev))
 398                 goto err_out_free_region;
 399
 400         dev->io = pci_resource_start(pdev, 0);
 401         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 402         dev->vdev.v4l2_dev = v4l2_dev;
 403         dev->vdev.fops = &maxiradio_fops;
 404         dev->vdev.ioctl_ops = &maxiradio_ioctl_ops;
 405         dev->vdev.release = video_device_release_empty;
 406         video_set_drvdata(&dev->vdev, dev);
 407
 408         if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 409                 v4l2_err(v4l2_dev, "can't register device!");
 410                 goto err_out_free_region;
 411         }
 412
 413         v4l2_info(v4l2_dev, "version " DRIVER_VERSION "\n");
 414
 415         v4l2_info(v4l2_dev, "found Guillemot MAXI Radio device (io = 0x%x)\n",
 416                dev->io);
 417         return 0;
 418
 419 err_out_free_region:
 420         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 421 err_out:
 422         v4l2_device_unregister(v4l2_dev);
 423 errfr:
 424         kfree(dev);
 425         return -ENODEV;
 426 }
 427
 428 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 429 {
 430         struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev);
 431         struct maxiradio *dev = to_maxiradio(v4l2_dev);
 432
 433         video_unregister_device(&dev->vdev);
 434         v4l2_device_unregister(&dev->v4l2_dev);
 435         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 436 }
 437
 438 static struct pci_device_id maxiradio_pci_tbl[] = {
 439         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 440                 PCI_ANY_ID, PCI_ANY_ID, },
 441         { 0 }
 442 };
 443
 444 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 445
 446 static struct pci_driver maxiradio_driver = {
 447         .name           = "radio-maxiradio",
 448         .id_table       = maxiradio_pci_tbl,
 449         .probe          = maxiradio_init_one,
 450         .remove         = __devexit_p(maxiradio_remove_one),
 451 };
 452
 453 static int __init maxiradio_radio_init(void)
 454 {
 455         return pci_register_driver(&maxiradio_driver);
 456 }
 457
 458 static void __exit maxiradio_radio_exit(void)
 459 {
 460         pci_unregister_driver(&maxiradio_driver);
 461 }
 462
 463 module_init(maxiradio_radio_init);
 464 module_exit(maxiradio_radio_exit);