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 static unsigned long in_use;
  89
  90 #define FREQ_LO          50*16000
  91 #define FREQ_HI         150*16000
  92
  93 #define FREQ_IF         171200 /* 10.7*16000   */
  94 #define FREQ_STEP       200    /* 12.5*16      */
  95
  96 /* (x==fmhz*16*1000) -> bits */
  97 #define FREQ2BITS(x)    ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1)) \
  98                         /(FREQ_STEP<<2))<<2)
  99
 100 #define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)
 101
 102
 103 static int maxiradio_exclusive_open(struct file *file)
 104 {
 105         return test_and_set_bit(0, &in_use) ? -EBUSY : 0;
 106 }
 107
 108 static int maxiradio_exclusive_release(struct file *file)
 109 {
 110         clear_bit(0, &in_use);
 111         return 0;
 112 }
 113
 114 static const struct v4l2_file_operations maxiradio_fops = {
 115         .owner          = THIS_MODULE,
 116         .open           = maxiradio_exclusive_open,
 117         .release        = maxiradio_exclusive_release,
 118         .ioctl          = video_ioctl2,
 119 };
 120
 121 static struct radio_device
 122 {
 123         __u16   io,     /* base of radio io */
 124                 muted,  /* VIDEO_AUDIO_MUTE */
 125                 stereo, /* VIDEO_TUNER_STEREO_ON */
 126                 tuned;  /* signal strength (0 or 0xffff) */
 127
 128         unsigned long freq;
 129
 130         struct mutex lock;
 131 } radio_unit = {
 132         .muted =1,
 133         .freq = FREQ_LO,
 134 };
 135
 136 static void outbit(unsigned long bit, __u16 io)
 137 {
 138         if (bit != 0)
 139                 {
 140                         outb(  power|wren|data     ,io); udelay(4);
 141                         outb(  power|wren|data|clk ,io); udelay(4);
 142                         outb(  power|wren|data     ,io); udelay(4);
 143                 }
 144         else
 145                 {
 146                         outb(  power|wren          ,io); udelay(4);
 147                         outb(  power|wren|clk      ,io); udelay(4);
 148                         outb(  power|wren          ,io); udelay(4);
 149                 }
 150 }
 151
 152 static void turn_power(__u16 io, int p)
 153 {
 154         if (p != 0) {
 155                 dprintk(1, "Radio powered on\n");
 156                 outb(power, io);
 157         } else {
 158                 dprintk(1, "Radio powered off\n");
 159                 outb(0,io);
 160         }
 161 }
 162
 163 static void set_freq(__u16 io, __u32 freq)
 164 {
 165         unsigned long int si;
 166         int bl;
 167         int val = FREQ2BITS(freq);
 168
 169         /* TEA5757 shift register bits (see pdf) */
 170
 171         outbit(0, io); /* 24  search */
 172         outbit(1, io); /* 23  search up/down */
 173
 174         outbit(0, io); /* 22  stereo/mono */
 175
 176         outbit(0, io); /* 21  band */
 177         outbit(0, io); /* 20  band (only 00=FM works I think) */
 178
 179         outbit(0, io); /* 19  port ? */
 180         outbit(0, io); /* 18  port ? */
 181
 182         outbit(0, io); /* 17  search level */
 183         outbit(0, io); /* 16  search level */
 184
 185         si = 0x8000;
 186         for (bl = 1; bl <= 16; bl++) {
 187                 outbit(val & si, io);
 188                 si >>= 1;
 189         }
 190
 191         dprintk(1, "Radio freq set to %d.%02d MHz\n",
 192                                 freq / 16000,
 193                                 freq % 16000 * 100 / 16000);
 194
 195         turn_power(io, 1);
 196 }
 197
 198 static int get_stereo(__u16 io)
 199 {
 200         outb(power,io);
 201         udelay(4);
 202
 203         return !(inb(io) & mo_st);
 204 }
 205
 206 static int get_tune(__u16 io)
 207 {
 208         outb(power+clk,io);
 209         udelay(4);
 210
 211         return !(inb(io) & mo_st);
 212 }
 213
 214
 215 static int vidioc_querycap (struct file *file, void  *priv,
 216                             struct v4l2_capability *v)
 217 {
 218         strlcpy(v->driver, "radio-maxiradio", sizeof (v->driver));
 219         strlcpy(v->card, "Maxi Radio FM2000 radio", sizeof (v->card));
 220         sprintf(v->bus_info,"ISA");
 221         v->version = RADIO_VERSION;
 222         v->capabilities = V4L2_CAP_TUNER;
 223
 224         return 0;
 225 }
 226
 227 static int vidioc_g_tuner (struct file *file, void *priv,
 228                            struct v4l2_tuner *v)
 229 {
 230         struct radio_device *card = video_drvdata(file);
 231
 232         if (v->index > 0)
 233                 return -EINVAL;
 234
 235         memset(v,0,sizeof(*v));
 236         strcpy(v->name, "FM");
 237         v->type = V4L2_TUNER_RADIO;
 238
 239         v->rangelow=FREQ_LO;
 240         v->rangehigh=FREQ_HI;
 241         v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
 242         v->capability=V4L2_TUNER_CAP_LOW;
 243         if(get_stereo(card->io))
 244                 v->audmode = V4L2_TUNER_MODE_STEREO;
 245         else
 246                 v->audmode = V4L2_TUNER_MODE_MONO;
 247         v->signal=0xffff*get_tune(card->io);
 248
 249         return 0;
 250 }
 251
 252 static int vidioc_s_tuner (struct file *file, void *priv,
 253                            struct v4l2_tuner *v)
 254 {
 255         if (v->index > 0)
 256                 return -EINVAL;
 257
 258         return 0;
 259 }
 260
 261 static int vidioc_g_audio (struct file *file, void *priv,
 262                            struct v4l2_audio *a)
 263 {
 264         if (a->index > 1)
 265                 return -EINVAL;
 266
 267         strcpy(a->name, "FM");
 268         a->capability = V4L2_AUDCAP_STEREO;
 269         return 0;
 270 }
 271
 272 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 273 {
 274         *i = 0;
 275
 276         return 0;
 277 }
 278
 279 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 280 {
 281         if (i != 0)
 282                 return -EINVAL;
 283
 284         return 0;
 285 }
 286
 287
 288 static int vidioc_s_audio (struct file *file, void *priv,
 289                            struct v4l2_audio *a)
 290 {
 291         if (a->index != 0)
 292                 return -EINVAL;
 293
 294         return 0;
 295 }
 296
 297 static int vidioc_s_frequency (struct file *file, void *priv,
 298                                struct v4l2_frequency *f)
 299 {
 300         struct radio_device *card = video_drvdata(file);
 301
 302         if (f->frequency < FREQ_LO || f->frequency > FREQ_HI) {
 303                 dprintk(1, "radio freq (%d.%02d MHz) out of range (%d-%d)\n",
 304                                         f->frequency / 16000,
 305                                         f->frequency % 16000 * 100 / 16000,
 306                                         FREQ_LO / 16000, FREQ_HI / 16000);
 307
 308                 return -EINVAL;
 309         }
 310
 311         card->freq = f->frequency;
 312         set_freq(card->io, card->freq);
 313         msleep(125);
 314
 315         return 0;
 316 }
 317
 318 static int vidioc_g_frequency (struct file *file, void *priv,
 319                                struct v4l2_frequency *f)
 320 {
 321         struct radio_device *card = video_drvdata(file);
 322
 323         f->type = V4L2_TUNER_RADIO;
 324         f->frequency = card->freq;
 325
 326         dprintk(4, "radio freq is %d.%02d MHz",
 327                                 f->frequency / 16000,
 328                                 f->frequency % 16000 * 100 / 16000);
 329
 330         return 0;
 331 }
 332
 333 static int vidioc_queryctrl (struct file *file, void *priv,
 334                              struct v4l2_queryctrl *qc)
 335 {
 336         int i;
 337
 338         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 339                 if (qc->id && qc->id == radio_qctrl[i].id) {
 340                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 341                         return (0);
 342                 }
 343         }
 344
 345         return -EINVAL;
 346 }
 347
 348 static int vidioc_g_ctrl (struct file *file, void *priv,
 349                             struct v4l2_control *ctrl)
 350 {
 351         struct radio_device *card = video_drvdata(file);
 352
 353         switch (ctrl->id) {
 354                 case V4L2_CID_AUDIO_MUTE:
 355                         ctrl->value=card->muted;
 356                         return (0);
 357         }
 358
 359         return -EINVAL;
 360 }
 361
 362 static int vidioc_s_ctrl (struct file *file, void *priv,
 363                           struct v4l2_control *ctrl)
 364 {
 365         struct radio_device *card = video_drvdata(file);
 366
 367         switch (ctrl->id) {
 368                 case V4L2_CID_AUDIO_MUTE:
 369                         card->muted = ctrl->value;
 370                         if(card->muted)
 371                                 turn_power(card->io, 0);
 372                         else
 373                                 set_freq(card->io, card->freq);
 374                         return 0;
 375         }
 376
 377         return -EINVAL;
 378 }
 379
 380 static const struct v4l2_ioctl_ops maxiradio_ioctl_ops = {
 381         .vidioc_querycap    = vidioc_querycap,
 382         .vidioc_g_tuner     = vidioc_g_tuner,
 383         .vidioc_s_tuner     = vidioc_s_tuner,
 384         .vidioc_g_audio     = vidioc_g_audio,
 385         .vidioc_s_audio     = vidioc_s_audio,
 386         .vidioc_g_input     = vidioc_g_input,
 387         .vidioc_s_input     = vidioc_s_input,
 388         .vidioc_g_frequency = vidioc_g_frequency,
 389         .vidioc_s_frequency = vidioc_s_frequency,
 390         .vidioc_queryctrl   = vidioc_queryctrl,
 391         .vidioc_g_ctrl      = vidioc_g_ctrl,
 392         .vidioc_s_ctrl      = vidioc_s_ctrl,
 393 };
 394
 395 static struct video_device maxiradio_radio = {
 396         .name           = "Maxi Radio FM2000 radio",
 397         .fops           = &maxiradio_fops,
 398         .ioctl_ops      = &maxiradio_ioctl_ops,
 399         .release        = video_device_release_empty,
 400 };
 401
 402 static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 403 {
 404         if(!request_region(pci_resource_start(pdev, 0),
 405                            pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 406                 printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
 407                 goto err_out;
 408         }
 409
 410         if (pci_enable_device(pdev))
 411                 goto err_out_free_region;
 412
 413         radio_unit.io = pci_resource_start(pdev, 0);
 414         mutex_init(&radio_unit.lock);
 415         video_set_drvdata(&maxiradio_radio, &radio_unit);
 416
 417         if (video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 418                 printk("radio-maxiradio: can't register device!");
 419                 goto err_out_free_region;
 420         }
 421
 422         printk(KERN_INFO "radio-maxiradio: version "
 423                DRIVER_VERSION
 424                " time "
 425                __TIME__ "  "
 426                __DATE__
 427                "\n");
 428
 429         printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
 430                radio_unit.io);
 431         return 0;
 432
 433 err_out_free_region:
 434         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 435 err_out:
 436         return -ENODEV;
 437 }
 438
 439 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 440 {
 441         video_unregister_device(&maxiradio_radio);
 442         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 443 }
 444
 445 static struct pci_device_id maxiradio_pci_tbl[] = {
 446         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 447                 PCI_ANY_ID, PCI_ANY_ID, },
 448         { 0,}
 449 };
 450
 451 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 452
 453 static struct pci_driver maxiradio_driver = {
 454         .name           = "radio-maxiradio",
 455         .id_table       = maxiradio_pci_tbl,
 456         .probe          = maxiradio_init_one,
 457         .remove         = __devexit_p(maxiradio_remove_one),
 458 };
 459
 460 static int __init maxiradio_radio_init(void)
 461 {
 462         return pci_register_driver(&maxiradio_driver);
 463 }
 464
 465 static void __exit maxiradio_radio_exit(void)
 466 {
 467         pci_unregister_driver(&maxiradio_driver);
 468 }
 469
 470 module_init(maxiradio_radio_init);
 471 module_exit(maxiradio_radio_exit);
 472
 473 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
 474 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
 475 MODULE_LICENSE("GPL");
 476
 477 module_param_named(debug,maxiradio_radio.debug, int, 0644);
 478 MODULE_PARM_DESC(debug,"activates debug info");