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 <asm/io.h>
  41 #include <asm/uaccess.h>
  42 #include <linux/mutex.h>
  43
  44 #include <linux/pci.h>
  45 #include <linux/videodev2.h>
  46 #include <media/v4l2-common.h>
  47 #include <media/v4l2-ioctl.h>
  48
  49 #define DRIVER_VERSION  "0.77"
  50
  51 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  52 #define RADIO_VERSION KERNEL_VERSION(0,7,7)
  53
  54 static struct video_device maxiradio_radio;
  55
  56 #define dprintk(num, fmt, arg...)                                          \
  57         do {                                                               \
  58                 if (maxiradio_radio.debug >= num)                          \
  59                         printk(KERN_DEBUG "%s: " fmt,                      \
  60                                 maxiradio_radio.name, ## arg); } while (0)
  61
  62 static struct v4l2_queryctrl radio_qctrl[] = {
  63         {
  64                 .id            = V4L2_CID_AUDIO_MUTE,
  65                 .name          = "Mute",
  66                 .minimum       = 0,
  67                 .maximum       = 1,
  68                 .default_value = 1,
  69                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  70         }
  71 };
  72
  73 #ifndef PCI_VENDOR_ID_GUILLEMOT
  74 #define PCI_VENDOR_ID_GUILLEMOT 0x5046
  75 #endif
  76
  77 #ifndef PCI_DEVICE_ID_GUILLEMOT
  78 #define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
  79 #endif
  80
  81
  82 /* TEA5757 pin mappings */
  83 static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;
  84
  85 static int radio_nr = -1;
  86 module_param(radio_nr, int, 0);
  87
  88
  89 #define FREQ_LO          50*16000
  90 #define FREQ_HI         150*16000
  91
  92 #define FREQ_IF         171200 /* 10.7*16000   */
  93 #define FREQ_STEP       200    /* 12.5*16      */
  94
  95 /* (x==fmhz*16*1000) -> bits */
  96 #define FREQ2BITS(x)    ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1)) \
  97                         /(FREQ_STEP<<2))<<2)
  98
  99 #define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)
 100
 101
 102 static const struct file_operations maxiradio_fops = {
 103         .owner          = THIS_MODULE,
 104         .open           = video_exclusive_open,
 105         .release        = video_exclusive_release,
 106         .ioctl          = video_ioctl2,
 107 #ifdef CONFIG_COMPAT
 108         .compat_ioctl   = v4l_compat_ioctl32,
 109 #endif
 110         .llseek         = no_llseek,
 111 };
 112
 113 static struct radio_device
 114 {
 115         __u16   io,     /* base of radio io */
 116                 muted,  /* VIDEO_AUDIO_MUTE */
 117                 stereo, /* VIDEO_TUNER_STEREO_ON */
 118                 tuned;  /* signal strength (0 or 0xffff) */
 119
 120         unsigned long freq;
 121
 122         struct mutex lock;
 123 } radio_unit = {
 124         .muted =1,
 125         .freq = FREQ_LO,
 126 };
 127
 128 static void outbit(unsigned long bit, __u16 io)
 129 {
 130         if (bit != 0)
 131                 {
 132                         outb(  power|wren|data     ,io); udelay(4);
 133                         outb(  power|wren|data|clk ,io); udelay(4);
 134                         outb(  power|wren|data     ,io); udelay(4);
 135                 }
 136         else
 137                 {
 138                         outb(  power|wren          ,io); udelay(4);
 139                         outb(  power|wren|clk      ,io); udelay(4);
 140                         outb(  power|wren          ,io); udelay(4);
 141                 }
 142 }
 143
 144 static void turn_power(__u16 io, int p)
 145 {
 146         if (p != 0) {
 147                 dprintk(1, "Radio powered on\n");
 148                 outb(power, io);
 149         } else {
 150                 dprintk(1, "Radio powered off\n");
 151                 outb(0,io);
 152         }
 153 }
 154
 155 static void set_freq(__u16 io, __u32 freq)
 156 {
 157         unsigned long int si;
 158         int bl;
 159         int val = FREQ2BITS(freq);
 160
 161         /* TEA5757 shift register bits (see pdf) */
 162
 163         outbit(0, io); /* 24  search */
 164         outbit(1, io); /* 23  search up/down */
 165
 166         outbit(0, io); /* 22  stereo/mono */
 167
 168         outbit(0, io); /* 21  band */
 169         outbit(0, io); /* 20  band (only 00=FM works I think) */
 170
 171         outbit(0, io); /* 19  port ? */
 172         outbit(0, io); /* 18  port ? */
 173
 174         outbit(0, io); /* 17  search level */
 175         outbit(0, io); /* 16  search level */
 176
 177         si = 0x8000;
 178         for (bl = 1; bl <= 16; bl++) {
 179                 outbit(val & si, io);
 180                 si >>= 1;
 181         }
 182
 183         dprintk(1, "Radio freq set to %d.%02d MHz\n",
 184                                 freq / 16000,
 185                                 freq % 16000 * 100 / 16000);
 186
 187         turn_power(io, 1);
 188 }
 189
 190 static int get_stereo(__u16 io)
 191 {
 192         outb(power,io);
 193         udelay(4);
 194
 195         return !(inb(io) & mo_st);
 196 }
 197
 198 static int get_tune(__u16 io)
 199 {
 200         outb(power+clk,io);
 201         udelay(4);
 202
 203         return !(inb(io) & mo_st);
 204 }
 205
 206
 207 static int vidioc_querycap (struct file *file, void  *priv,
 208                             struct v4l2_capability *v)
 209 {
 210         strlcpy(v->driver, "radio-maxiradio", sizeof (v->driver));
 211         strlcpy(v->card, "Maxi Radio FM2000 radio", sizeof (v->card));
 212         sprintf(v->bus_info,"ISA");
 213         v->version = RADIO_VERSION;
 214         v->capabilities = V4L2_CAP_TUNER;
 215
 216         return 0;
 217 }
 218
 219 static int vidioc_g_tuner (struct file *file, void *priv,
 220                            struct v4l2_tuner *v)
 221 {
 222         struct video_device *dev = video_devdata(file);
 223         struct radio_device *card=dev->priv;
 224
 225         if (v->index > 0)
 226                 return -EINVAL;
 227
 228         memset(v,0,sizeof(*v));
 229         strcpy(v->name, "FM");
 230         v->type = V4L2_TUNER_RADIO;
 231
 232         v->rangelow=FREQ_LO;
 233         v->rangehigh=FREQ_HI;
 234         v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
 235         v->capability=V4L2_TUNER_CAP_LOW;
 236         if(get_stereo(card->io))
 237                 v->audmode = V4L2_TUNER_MODE_STEREO;
 238         else
 239                 v->audmode = V4L2_TUNER_MODE_MONO;
 240         v->signal=0xffff*get_tune(card->io);
 241
 242         return 0;
 243 }
 244
 245 static int vidioc_s_tuner (struct file *file, void *priv,
 246                            struct v4l2_tuner *v)
 247 {
 248         if (v->index > 0)
 249                 return -EINVAL;
 250
 251         return 0;
 252 }
 253
 254 static int vidioc_g_audio (struct file *file, void *priv,
 255                            struct v4l2_audio *a)
 256 {
 257         if (a->index > 1)
 258                 return -EINVAL;
 259
 260         strcpy(a->name, "FM");
 261         a->capability = V4L2_AUDCAP_STEREO;
 262         return 0;
 263 }
 264
 265 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 266 {
 267         *i = 0;
 268
 269         return 0;
 270 }
 271
 272 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 273 {
 274         if (i != 0)
 275                 return -EINVAL;
 276
 277         return 0;
 278 }
 279
 280
 281 static int vidioc_s_audio (struct file *file, void *priv,
 282                            struct v4l2_audio *a)
 283 {
 284         if (a->index != 0)
 285                 return -EINVAL;
 286
 287         return 0;
 288 }
 289
 290 static int vidioc_s_frequency (struct file *file, void *priv,
 291                                struct v4l2_frequency *f)
 292 {
 293         struct video_device *dev = video_devdata(file);
 294         struct radio_device *card=dev->priv;
 295
 296         if (f->frequency < FREQ_LO || f->frequency > FREQ_HI) {
 297                 dprintk(1, "radio freq (%d.%02d MHz) out of range (%d-%d)\n",
 298                                         f->frequency / 16000,
 299                                         f->frequency % 16000 * 100 / 16000,
 300                                         FREQ_LO / 16000, FREQ_HI / 16000);
 301
 302                 return -EINVAL;
 303         }
 304
 305         card->freq = f->frequency;
 306         set_freq(card->io, card->freq);
 307         msleep(125);
 308
 309         return 0;
 310 }
 311
 312 static int vidioc_g_frequency (struct file *file, void *priv,
 313                                struct v4l2_frequency *f)
 314 {
 315         struct video_device *dev = video_devdata(file);
 316         struct radio_device *card=dev->priv;
 317
 318         f->type = V4L2_TUNER_RADIO;
 319         f->frequency = card->freq;
 320
 321         dprintk(4, "radio freq is %d.%02d MHz",
 322                                 f->frequency / 16000,
 323                                 f->frequency % 16000 * 100 / 16000);
 324
 325         return 0;
 326 }
 327
 328 static int vidioc_queryctrl (struct file *file, void *priv,
 329                              struct v4l2_queryctrl *qc)
 330 {
 331         int i;
 332
 333         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 334                 if (qc->id && qc->id == radio_qctrl[i].id) {
 335                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 336                         return (0);
 337                 }
 338         }
 339
 340         return -EINVAL;
 341 }
 342
 343 static int vidioc_g_ctrl (struct file *file, void *priv,
 344                             struct v4l2_control *ctrl)
 345 {
 346         struct video_device *dev = video_devdata(file);
 347         struct radio_device *card=dev->priv;
 348
 349         switch (ctrl->id) {
 350                 case V4L2_CID_AUDIO_MUTE:
 351                         ctrl->value=card->muted;
 352                         return (0);
 353         }
 354
 355         return -EINVAL;
 356 }
 357
 358 static int vidioc_s_ctrl (struct file *file, void *priv,
 359                           struct v4l2_control *ctrl)
 360 {
 361         struct video_device *dev = video_devdata(file);
 362         struct radio_device *card=dev->priv;
 363
 364         switch (ctrl->id) {
 365                 case V4L2_CID_AUDIO_MUTE:
 366                         card->muted = ctrl->value;
 367                         if(card->muted)
 368                                 turn_power(card->io, 0);
 369                         else
 370                                 set_freq(card->io, card->freq);
 371                         return 0;
 372         }
 373
 374         return -EINVAL;
 375 }
 376
 377 static const struct v4l2_ioctl_ops maxiradio_ioctl_ops = {
 378         .vidioc_querycap    = vidioc_querycap,
 379         .vidioc_g_tuner     = vidioc_g_tuner,
 380         .vidioc_s_tuner     = vidioc_s_tuner,
 381         .vidioc_g_audio     = vidioc_g_audio,
 382         .vidioc_s_audio     = vidioc_s_audio,
 383         .vidioc_g_input     = vidioc_g_input,
 384         .vidioc_s_input     = vidioc_s_input,
 385         .vidioc_g_frequency = vidioc_g_frequency,
 386         .vidioc_s_frequency = vidioc_s_frequency,
 387         .vidioc_queryctrl   = vidioc_queryctrl,
 388         .vidioc_g_ctrl      = vidioc_g_ctrl,
 389         .vidioc_s_ctrl      = vidioc_s_ctrl,
 390 };
 391
 392 static struct video_device maxiradio_radio = {
 393         .name               = "Maxi Radio FM2000 radio",
 394         .fops               = &maxiradio_fops,
 395         .ioctl_ops          = &maxiradio_ioctl_ops,
 396 };
 397
 398 static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 399 {
 400         if(!request_region(pci_resource_start(pdev, 0),
 401                            pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 402                 printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
 403                 goto err_out;
 404         }
 405
 406         if (pci_enable_device(pdev))
 407                 goto err_out_free_region;
 408
 409         radio_unit.io = pci_resource_start(pdev, 0);
 410         mutex_init(&radio_unit.lock);
 411         maxiradio_radio.priv = &radio_unit;
 412
 413         if (video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 414                 printk("radio-maxiradio: can't register device!");
 415                 goto err_out_free_region;
 416         }
 417
 418         printk(KERN_INFO "radio-maxiradio: version "
 419                DRIVER_VERSION
 420                " time "
 421                __TIME__ "  "
 422                __DATE__
 423                "\n");
 424
 425         printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
 426                radio_unit.io);
 427         return 0;
 428
 429 err_out_free_region:
 430         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 431 err_out:
 432         return -ENODEV;
 433 }
 434
 435 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 436 {
 437         video_unregister_device(&maxiradio_radio);
 438         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 439 }
 440
 441 static struct pci_device_id maxiradio_pci_tbl[] = {
 442         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 443                 PCI_ANY_ID, PCI_ANY_ID, },
 444         { 0,}
 445 };
 446
 447 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 448
 449 static struct pci_driver maxiradio_driver = {
 450         .name           = "radio-maxiradio",
 451         .id_table       = maxiradio_pci_tbl,
 452         .probe          = maxiradio_init_one,
 453         .remove         = __devexit_p(maxiradio_remove_one),
 454 };
 455
 456 static int __init maxiradio_radio_init(void)
 457 {
 458         return pci_register_driver(&maxiradio_driver);
 459 }
 460
 461 static void __exit maxiradio_radio_exit(void)
 462 {
 463         pci_unregister_driver(&maxiradio_driver);
 464 }
 465
 466 module_init(maxiradio_radio_init);
 467 module_exit(maxiradio_radio_exit);
 468
 469 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
 470 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
 471 MODULE_LICENSE("GPL");
 472
 473 module_param_named(debug,maxiradio_radio.debug, int, 0644);
 474 MODULE_PARM_DESC(debug,"activates debug info");