git.oblomov.eu Git - linux-2.6/blob - drivers/media/radio/radio-typhoon.c

   1 /* Typhoon Radio Card driver for radio support
   2  * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
   3  *
   4  * Card manufacturer:
   5  * http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e
   6  *
   7  * Notes on the hardware
   8  *
   9  * This card has two output sockets, one for speakers and one for line.
  10  * The speaker output has volume control, but only in four discrete
  11  * steps. The line output has neither volume control nor mute.
  12  *
  13  * The card has auto-stereo according to its manual, although it all
  14  * sounds mono to me (even with the Win/DOS drivers). Maybe it's my
  15  * antenna - I really don't know for sure.
  16  *
  17  * Frequency control is done digitally.
  18  *
  19  * Volume control is done digitally, but there are only four different
  20  * possible values. So you should better always turn the volume up and
  21  * use line control. I got the best results by connecting line output
  22  * to the sound card microphone input. For such a configuration the
  23  * volume control has no effect, since volume control only influences
  24  * the speaker output.
  25  *
  26  * There is no explicit mute/unmute. So I set the radio frequency to a
  27  * value where I do expect just noise and turn the speaker volume down.
  28  * The frequency change is necessary since the card never seems to be
  29  * completely silent.
  30  *
  31  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  32  */
  33
  34 #include <linux/module.h>       /* Modules                        */
  35 #include <linux/init.h>         /* Initdata                       */
  36 #include <linux/ioport.h>       /* request_region                 */
  37 #include <linux/proc_fs.h>      /* radio card status report       */
  38 #include <linux/seq_file.h>
  39 #include <asm/io.h>             /* outb, outb_p                   */
  40 #include <asm/uaccess.h>        /* copy to/from user              */
  41 #include <linux/videodev2.h>    /* kernel radio structs           */
  42 #include <media/v4l2-common.h>
  43
  44 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  45 #define RADIO_VERSION KERNEL_VERSION(0,1,1)
  46 #define BANNER "Typhoon Radio Card driver v0.1.1\n"
  47
  48 static struct v4l2_queryctrl radio_qctrl[] = {
  49         {
  50                 .id            = V4L2_CID_AUDIO_MUTE,
  51                 .name          = "Mute",
  52                 .minimum       = 0,
  53                 .maximum       = 1,
  54                 .default_value = 1,
  55                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  56         },{
  57                 .id            = V4L2_CID_AUDIO_VOLUME,
  58                 .name          = "Volume",
  59                 .minimum       = 0,
  60                 .maximum       = 65535,
  61                 .step          = 1<<14,
  62                 .default_value = 0xff,
  63                 .type          = V4L2_CTRL_TYPE_INTEGER,
  64         }
  65 };
  66
  67
  68 #ifndef CONFIG_RADIO_TYPHOON_PORT
  69 #define CONFIG_RADIO_TYPHOON_PORT -1
  70 #endif
  71
  72 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
  73 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
  74 #endif
  75
  76 #ifndef CONFIG_PROC_FS
  77 #undef CONFIG_RADIO_TYPHOON_PROC_FS
  78 #endif
  79
  80 struct typhoon_device {
  81         int users;
  82         int iobase;
  83         int curvol;
  84         int muted;
  85         unsigned long curfreq;
  86         unsigned long mutefreq;
  87         struct mutex lock;
  88 };
  89
  90 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
  91 static int typhoon_setfreq_generic(struct typhoon_device *dev,
  92                                    unsigned long frequency);
  93 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
  94 static void typhoon_mute(struct typhoon_device *dev);
  95 static void typhoon_unmute(struct typhoon_device *dev);
  96 static int typhoon_setvol(struct typhoon_device *dev, int vol);
  97
  98 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
  99 {
 100         mutex_lock(&dev->lock);
 101         vol >>= 14;                             /* Map 16 bit to 2 bit */
 102         vol &= 3;
 103         outb_p(vol / 2, dev->iobase);           /* Set the volume, high bit. */
 104         outb_p(vol % 2, dev->iobase + 2);       /* Set the volume, low bit. */
 105         mutex_unlock(&dev->lock);
 106 }
 107
 108 static int typhoon_setfreq_generic(struct typhoon_device *dev,
 109                                    unsigned long frequency)
 110 {
 111         unsigned long outval;
 112         unsigned long x;
 113
 114         /*
 115          * The frequency transfer curve is not linear. The best fit I could
 116          * get is
 117          *
 118          * outval = -155 + exp((f + 15.55) * 0.057))
 119          *
 120          * where frequency f is in MHz. Since we don't have exp in the kernel,
 121          * I approximate this function by a third order polynomial.
 122          *
 123          */
 124
 125         mutex_lock(&dev->lock);
 126         x = frequency / 160;
 127         outval = (x * x + 2500) / 5000;
 128         outval = (outval * x + 5000) / 10000;
 129         outval -= (10 * x * x + 10433) / 20866;
 130         outval += 4 * x - 11505;
 131
 132         outb_p((outval >> 8) & 0x01, dev->iobase + 4);
 133         outb_p(outval >> 9, dev->iobase + 6);
 134         outb_p(outval & 0xff, dev->iobase + 8);
 135         mutex_unlock(&dev->lock);
 136
 137         return 0;
 138 }
 139
 140 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
 141 {
 142         typhoon_setfreq_generic(dev, frequency);
 143         dev->curfreq = frequency;
 144         return 0;
 145 }
 146
 147 static void typhoon_mute(struct typhoon_device *dev)
 148 {
 149         if (dev->muted == 1)
 150                 return;
 151         typhoon_setvol_generic(dev, 0);
 152         typhoon_setfreq_generic(dev, dev->mutefreq);
 153         dev->muted = 1;
 154 }
 155
 156 static void typhoon_unmute(struct typhoon_device *dev)
 157 {
 158         if (dev->muted == 0)
 159                 return;
 160         typhoon_setfreq_generic(dev, dev->curfreq);
 161         typhoon_setvol_generic(dev, dev->curvol);
 162         dev->muted = 0;
 163 }
 164
 165 static int typhoon_setvol(struct typhoon_device *dev, int vol)
 166 {
 167         if (dev->muted && vol != 0) {   /* user is unmuting the card */
 168                 dev->curvol = vol;
 169                 typhoon_unmute(dev);
 170                 return 0;
 171         }
 172         if (vol == dev->curvol)         /* requested volume == current */
 173                 return 0;
 174
 175         if (vol == 0) {                 /* volume == 0 means mute the card */
 176                 typhoon_mute(dev);
 177                 dev->curvol = vol;
 178                 return 0;
 179         }
 180         typhoon_setvol_generic(dev, vol);
 181         dev->curvol = vol;
 182         return 0;
 183 }
 184
 185 static int vidioc_querycap(struct file *file, void  *priv,
 186                                         struct v4l2_capability *v)
 187 {
 188         strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
 189         strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
 190         sprintf(v->bus_info, "ISA");
 191         v->version = RADIO_VERSION;
 192         v->capabilities = V4L2_CAP_TUNER;
 193         return 0;
 194 }
 195
 196 static int vidioc_g_tuner(struct file *file, void *priv,
 197                                         struct v4l2_tuner *v)
 198 {
 199         if (v->index > 0)
 200                 return -EINVAL;
 201
 202         strcpy(v->name, "FM");
 203         v->type = V4L2_TUNER_RADIO;
 204         v->rangelow = (87.5*16000);
 205         v->rangehigh = (108*16000);
 206         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 207         v->capability = V4L2_TUNER_CAP_LOW;
 208         v->audmode = V4L2_TUNER_MODE_MONO;
 209         v->signal = 0xFFFF;     /* We can't get the signal strength */
 210         return 0;
 211 }
 212
 213 static int vidioc_s_tuner(struct file *file, void *priv,
 214                                         struct v4l2_tuner *v)
 215 {
 216         if (v->index > 0)
 217                 return -EINVAL;
 218
 219         return 0;
 220 }
 221
 222 static int vidioc_s_frequency(struct file *file, void *priv,
 223                                         struct v4l2_frequency *f)
 224 {
 225         struct video_device *dev = video_devdata(file);
 226         struct typhoon_device *typhoon = dev->priv;
 227
 228         typhoon->curfreq = f->frequency;
 229         typhoon_setfreq(typhoon, typhoon->curfreq);
 230         return 0;
 231 }
 232
 233 static int vidioc_g_frequency(struct file *file, void *priv,
 234                                         struct v4l2_frequency *f)
 235 {
 236         struct video_device *dev = video_devdata(file);
 237         struct typhoon_device *typhoon = dev->priv;
 238
 239         f->type = V4L2_TUNER_RADIO;
 240         f->frequency = typhoon->curfreq;
 241
 242         return 0;
 243 }
 244
 245 static int vidioc_queryctrl(struct file *file, void *priv,
 246                                         struct v4l2_queryctrl *qc)
 247 {
 248         int i;
 249
 250         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 251                 if (qc->id && qc->id == radio_qctrl[i].id) {
 252                         memcpy(qc, &(radio_qctrl[i]),
 253                                                 sizeof(*qc));
 254                         return 0;
 255                 }
 256         }
 257         return -EINVAL;
 258 }
 259
 260 static int vidioc_g_ctrl(struct file *file, void *priv,
 261                                         struct v4l2_control *ctrl)
 262 {
 263         struct video_device *dev = video_devdata(file);
 264         struct typhoon_device *typhoon = dev->priv;
 265
 266         switch (ctrl->id) {
 267         case V4L2_CID_AUDIO_MUTE:
 268                 ctrl->value = typhoon->muted;
 269                 return 0;
 270         case V4L2_CID_AUDIO_VOLUME:
 271                 ctrl->value = typhoon->curvol;
 272                 return 0;
 273         }
 274         return -EINVAL;
 275 }
 276
 277 static int vidioc_s_ctrl (struct file *file, void *priv,
 278                                         struct v4l2_control *ctrl)
 279 {
 280         struct video_device *dev = video_devdata(file);
 281         struct typhoon_device *typhoon = dev->priv;
 282
 283         switch (ctrl->id) {
 284         case V4L2_CID_AUDIO_MUTE:
 285                 if (ctrl->value)
 286                         typhoon_mute(typhoon);
 287                 else
 288                         typhoon_unmute(typhoon);
 289                 return 0;
 290         case V4L2_CID_AUDIO_VOLUME:
 291                 typhoon_setvol(typhoon, ctrl->value);
 292                 return 0;
 293         }
 294         return -EINVAL;
 295 }
 296
 297 static int vidioc_g_audio(struct file *file, void *priv,
 298                                         struct v4l2_audio *a)
 299 {
 300         if (a->index > 1)
 301                 return -EINVAL;
 302
 303         strcpy(a->name, "Radio");
 304         a->capability = V4L2_AUDCAP_STEREO;
 305         return 0;
 306 }
 307
 308 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 309 {
 310         *i = 0;
 311         return 0;
 312 }
 313
 314 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 315 {
 316         if (i != 0)
 317                 return -EINVAL;
 318         return 0;
 319 }
 320
 321 static int vidioc_s_audio(struct file *file, void *priv,
 322                                         struct v4l2_audio *a)
 323 {
 324         if (a->index != 0)
 325                 return -EINVAL;
 326         return 0;
 327 }
 328
 329 static struct typhoon_device typhoon_unit =
 330 {
 331         .iobase         = CONFIG_RADIO_TYPHOON_PORT,
 332         .curfreq        = CONFIG_RADIO_TYPHOON_MUTEFREQ,
 333         .mutefreq       = CONFIG_RADIO_TYPHOON_MUTEFREQ,
 334 };
 335
 336 static const struct file_operations typhoon_fops = {
 337         .owner          = THIS_MODULE,
 338         .open           = video_exclusive_open,
 339         .release        = video_exclusive_release,
 340         .ioctl          = video_ioctl2,
 341 #ifdef CONFIG_COMPAT
 342         .compat_ioctl   = v4l_compat_ioctl32,
 343 #endif
 344         .llseek         = no_llseek,
 345 };
 346
 347 static struct video_device typhoon_radio =
 348 {
 349         .owner          = THIS_MODULE,
 350         .name           = "Typhoon Radio",
 351         .type           = VID_TYPE_TUNER,
 352         .fops           = &typhoon_fops,
 353         .vidioc_querycap    = vidioc_querycap,
 354         .vidioc_g_tuner     = vidioc_g_tuner,
 355         .vidioc_s_tuner     = vidioc_s_tuner,
 356         .vidioc_g_audio     = vidioc_g_audio,
 357         .vidioc_s_audio     = vidioc_s_audio,
 358         .vidioc_g_input     = vidioc_g_input,
 359         .vidioc_s_input     = vidioc_s_input,
 360         .vidioc_g_frequency = vidioc_g_frequency,
 361         .vidioc_s_frequency = vidioc_s_frequency,
 362         .vidioc_queryctrl   = vidioc_queryctrl,
 363         .vidioc_g_ctrl      = vidioc_g_ctrl,
 364         .vidioc_s_ctrl      = vidioc_s_ctrl,
 365 };
 366
 367 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
 368
 369 static int typhoon_proc_show(struct seq_file *m, void *v)
 370 {
 371         #ifdef MODULE
 372             #define MODULEPROCSTRING "Driver loaded as a module"
 373         #else
 374             #define MODULEPROCSTRING "Driver compiled into kernel"
 375         #endif
 376
 377         seq_puts(m, BANNER);
 378         seq_puts(m, "Load type: " MODULEPROCSTRING "\n\n");
 379         seq_printf(m, "frequency = %lu kHz\n",
 380                 typhoon_unit.curfreq >> 4);
 381         seq_printf(m, "volume = %d\n", typhoon_unit.curvol);
 382         seq_printf(m, "mute = %s\n", typhoon_unit.muted ?
 383                 "on" : "off");
 384         seq_printf(m, "iobase = 0x%x\n", typhoon_unit.iobase);
 385         seq_printf(m, "mute frequency = %lu kHz\n",
 386                 typhoon_unit.mutefreq >> 4);
 387         return 0;
 388 }
 389
 390 static int typhoon_proc_open(struct inode *inode, struct file *file)
 391 {
 392         return single_open(file, typhoon_proc_show, NULL);
 393 }
 394
 395 static const struct file_operations typhoon_proc_fops = {
 396         .owner          = THIS_MODULE,
 397         .open           = typhoon_proc_open,
 398         .read           = seq_read,
 399         .llseek         = seq_lseek,
 400         .release        = single_release,
 401 };
 402 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
 403
 404 MODULE_AUTHOR("Dr. Henrik Seidel");
 405 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
 406 MODULE_LICENSE("GPL");
 407
 408 static int io = -1;
 409 static int radio_nr = -1;
 410
 411 module_param(io, int, 0);
 412 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
 413 module_param(radio_nr, int, 0);
 414
 415 #ifdef MODULE
 416 static unsigned long mutefreq;
 417 module_param(mutefreq, ulong, 0);
 418 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
 419 #endif
 420
 421 static int __init typhoon_init(void)
 422 {
 423 #ifdef MODULE
 424         if (io == -1) {
 425                 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
 426                 return -EINVAL;
 427         }
 428         typhoon_unit.iobase = io;
 429
 430         if (mutefreq < 87000 || mutefreq > 108500) {
 431                 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
 432                 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
 433                 return -EINVAL;
 434         }
 435         typhoon_unit.mutefreq = mutefreq;
 436 #endif /* MODULE */
 437
 438         printk(KERN_INFO BANNER);
 439         mutex_init(&typhoon_unit.lock);
 440         io = typhoon_unit.iobase;
 441         if (!request_region(io, 8, "typhoon")) {
 442                 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
 443                        typhoon_unit.iobase);
 444                 return -EBUSY;
 445         }
 446
 447         typhoon_radio.priv = &typhoon_unit;
 448         if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1)
 449         {
 450                 release_region(io, 8);
 451                 return -EINVAL;
 452         }
 453         printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
 454         printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
 455                typhoon_unit.mutefreq);
 456         typhoon_unit.mutefreq <<= 4;
 457
 458         /* mute card - prevents noisy bootups */
 459         typhoon_mute(&typhoon_unit);
 460
 461 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
 462         if (!proc_create("driver/radio-typhoon", 0, NULL, &typhoon_proc_fops))
 463                 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
 464 #endif
 465
 466         return 0;
 467 }
 468
 469 static void __exit typhoon_cleanup_module(void)
 470 {
 471
 472 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
 473         remove_proc_entry("driver/radio-typhoon", NULL);
 474 #endif
 475
 476         video_unregister_device(&typhoon_radio);
 477         release_region(io, 8);
 478 }
 479
 480 module_init(typhoon_init);
 481 module_exit(typhoon_cleanup_module);
 482