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  * Notes on the hardware
   5  *
   6  * This card has two output sockets, one for speakers and one for line.
   7  * The speaker output has volume control, but only in four discrete
   8  * steps. The line output has neither volume control nor mute.
   9  *
  10  * The card has auto-stereo according to its manual, although it all
  11  * sounds mono to me (even with the Win/DOS drivers). Maybe it's my
  12  * antenna - I really don't know for sure.
  13  *
  14  * Frequency control is done digitally.
  15  *
  16  * Volume control is done digitally, but there are only four different
  17  * possible values. So you should better always turn the volume up and
  18  * use line control. I got the best results by connecting line output
  19  * to the sound card microphone input. For such a configuration the
  20  * volume control has no effect, since volume control only influences
  21  * the speaker output.
  22  *
  23  * There is no explicit mute/unmute. So I set the radio frequency to a
  24  * value where I do expect just noise and turn the speaker volume down.
  25  * The frequency change is necessary since the card never seems to be
  26  * completely silent.
  27  *
  28  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  29  */
  30
  31 #include <linux/module.h>       /* Modules                        */
  32 #include <linux/init.h>         /* Initdata                       */
  33 #include <linux/ioport.h>       /* request_region                 */
  34 #include <linux/videodev2.h>    /* kernel radio structs           */
  35 #include <linux/io.h>           /* outb, outb_p                   */
  36 #include <media/v4l2-device.h>
  37 #include <media/v4l2-ioctl.h>
  38
  39 #define DRIVER_VERSION "0.1.2"
  40
  41 MODULE_AUTHOR("Dr. Henrik Seidel");
  42 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
  43 MODULE_LICENSE("GPL");
  44 MODULE_VERSION(DRIVER_VERSION);
  45
  46 #ifndef CONFIG_RADIO_TYPHOON_PORT
  47 #define CONFIG_RADIO_TYPHOON_PORT -1
  48 #endif
  49
  50 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
  51 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
  52 #endif
  53
  54 static int io = CONFIG_RADIO_TYPHOON_PORT;
  55 static int radio_nr = -1;
  56
  57 module_param(io, int, 0);
  58 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
  59
  60 module_param(radio_nr, int, 0);
  61
  62 static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ;
  63 module_param(mutefreq, ulong, 0);
  64 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
  65
  66 #define BANNER "Typhoon Radio Card driver v" DRIVER_VERSION "\n"
  67
  68 struct typhoon {
  69         struct v4l2_device v4l2_dev;
  70         struct video_device vdev;
  71         int io;
  72         int curvol;
  73         int muted;
  74         unsigned long curfreq;
  75         unsigned long mutefreq;
  76         struct mutex lock;
  77 };
  78
  79 static struct typhoon typhoon_card;
  80
  81 static void typhoon_setvol_generic(struct typhoon *dev, int vol)
  82 {
  83         mutex_lock(&dev->lock);
  84         vol >>= 14;                             /* Map 16 bit to 2 bit */
  85         vol &= 3;
  86         outb_p(vol / 2, dev->io);               /* Set the volume, high bit. */
  87         outb_p(vol % 2, dev->io + 2);   /* Set the volume, low bit. */
  88         mutex_unlock(&dev->lock);
  89 }
  90
  91 static int typhoon_setfreq_generic(struct typhoon *dev,
  92                                    unsigned long frequency)
  93 {
  94         unsigned long outval;
  95         unsigned long x;
  96
  97         /*
  98          * The frequency transfer curve is not linear. The best fit I could
  99          * get is
 100          *
 101          * outval = -155 + exp((f + 15.55) * 0.057))
 102          *
 103          * where frequency f is in MHz. Since we don't have exp in the kernel,
 104          * I approximate this function by a third order polynomial.
 105          *
 106          */
 107
 108         mutex_lock(&dev->lock);
 109         x = frequency / 160;
 110         outval = (x * x + 2500) / 5000;
 111         outval = (outval * x + 5000) / 10000;
 112         outval -= (10 * x * x + 10433) / 20866;
 113         outval += 4 * x - 11505;
 114
 115         outb_p((outval >> 8) & 0x01, dev->io + 4);
 116         outb_p(outval >> 9, dev->io + 6);
 117         outb_p(outval & 0xff, dev->io + 8);
 118         mutex_unlock(&dev->lock);
 119
 120         return 0;
 121 }
 122
 123 static int typhoon_setfreq(struct typhoon *dev, unsigned long frequency)
 124 {
 125         typhoon_setfreq_generic(dev, frequency);
 126         dev->curfreq = frequency;
 127         return 0;
 128 }
 129
 130 static void typhoon_mute(struct typhoon *dev)
 131 {
 132         if (dev->muted == 1)
 133                 return;
 134         typhoon_setvol_generic(dev, 0);
 135         typhoon_setfreq_generic(dev, dev->mutefreq);
 136         dev->muted = 1;
 137 }
 138
 139 static void typhoon_unmute(struct typhoon *dev)
 140 {
 141         if (dev->muted == 0)
 142                 return;
 143         typhoon_setfreq_generic(dev, dev->curfreq);
 144         typhoon_setvol_generic(dev, dev->curvol);
 145         dev->muted = 0;
 146 }
 147
 148 static int typhoon_setvol(struct typhoon *dev, int vol)
 149 {
 150         if (dev->muted && vol != 0) {   /* user is unmuting the card */
 151                 dev->curvol = vol;
 152                 typhoon_unmute(dev);
 153                 return 0;
 154         }
 155         if (vol == dev->curvol)         /* requested volume == current */
 156                 return 0;
 157
 158         if (vol == 0) {                 /* volume == 0 means mute the card */
 159                 typhoon_mute(dev);
 160                 dev->curvol = vol;
 161                 return 0;
 162         }
 163         typhoon_setvol_generic(dev, vol);
 164         dev->curvol = vol;
 165         return 0;
 166 }
 167
 168 static int vidioc_querycap(struct file *file, void  *priv,
 169                                         struct v4l2_capability *v)
 170 {
 171         strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
 172         strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
 173         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 174         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 175         return 0;
 176 }
 177
 178 static int vidioc_g_tuner(struct file *file, void *priv,
 179                                         struct v4l2_tuner *v)
 180 {
 181         if (v->index > 0)
 182                 return -EINVAL;
 183
 184         strlcpy(v->name, "FM", sizeof(v->name));
 185         v->type = V4L2_TUNER_RADIO;
 186         v->rangelow = 87.5 * 16000;
 187         v->rangehigh = 108 * 16000;
 188         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 189         v->capability = V4L2_TUNER_CAP_LOW;
 190         v->audmode = V4L2_TUNER_MODE_MONO;
 191         v->signal = 0xFFFF;     /* We can't get the signal strength */
 192         return 0;
 193 }
 194
 195 static int vidioc_s_tuner(struct file *file, void *priv,
 196                                         struct v4l2_tuner *v)
 197 {
 198         return v->index ? -EINVAL : 0;
 199 }
 200
 201 static int vidioc_g_frequency(struct file *file, void *priv,
 202                                         struct v4l2_frequency *f)
 203 {
 204         struct typhoon *dev = video_drvdata(file);
 205
 206         if (f->tuner != 0)
 207                 return -EINVAL;
 208         f->type = V4L2_TUNER_RADIO;
 209         f->frequency = dev->curfreq;
 210         return 0;
 211 }
 212
 213 static int vidioc_s_frequency(struct file *file, void *priv,
 214                                         struct v4l2_frequency *f)
 215 {
 216         struct typhoon *dev = video_drvdata(file);
 217
 218         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 219                 return -EINVAL;
 220         dev->curfreq = f->frequency;
 221         typhoon_setfreq(dev, dev->curfreq);
 222         return 0;
 223 }
 224
 225 static int vidioc_queryctrl(struct file *file, void *priv,
 226                                         struct v4l2_queryctrl *qc)
 227 {
 228         switch (qc->id) {
 229         case V4L2_CID_AUDIO_MUTE:
 230                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 231         case V4L2_CID_AUDIO_VOLUME:
 232                 return v4l2_ctrl_query_fill(qc, 0, 65535, 16384, 65535);
 233         }
 234         return -EINVAL;
 235 }
 236
 237 static int vidioc_g_ctrl(struct file *file, void *priv,
 238                                         struct v4l2_control *ctrl)
 239 {
 240         struct typhoon *dev = video_drvdata(file);
 241
 242         switch (ctrl->id) {
 243         case V4L2_CID_AUDIO_MUTE:
 244                 ctrl->value = dev->muted;
 245                 return 0;
 246         case V4L2_CID_AUDIO_VOLUME:
 247                 ctrl->value = dev->curvol;
 248                 return 0;
 249         }
 250         return -EINVAL;
 251 }
 252
 253 static int vidioc_s_ctrl (struct file *file, void *priv,
 254                                         struct v4l2_control *ctrl)
 255 {
 256         struct typhoon *dev = video_drvdata(file);
 257
 258         switch (ctrl->id) {
 259         case V4L2_CID_AUDIO_MUTE:
 260                 if (ctrl->value)
 261                         typhoon_mute(dev);
 262                 else
 263                         typhoon_unmute(dev);
 264                 return 0;
 265         case V4L2_CID_AUDIO_VOLUME:
 266                 typhoon_setvol(dev, ctrl->value);
 267                 return 0;
 268         }
 269         return -EINVAL;
 270 }
 271
 272 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 273 {
 274         *i = 0;
 275         return 0;
 276 }
 277
 278 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 279 {
 280         return i ? -EINVAL : 0;
 281 }
 282
 283 static int vidioc_g_audio(struct file *file, void *priv,
 284                                         struct v4l2_audio *a)
 285 {
 286         a->index = 0;
 287         strlcpy(a->name, "Radio", sizeof(a->name));
 288         a->capability = V4L2_AUDCAP_STEREO;
 289         return 0;
 290 }
 291
 292 static int vidioc_s_audio(struct file *file, void *priv,
 293                                         struct v4l2_audio *a)
 294 {
 295         return a->index ? -EINVAL : 0;
 296 }
 297
 298 static int vidioc_log_status(struct file *file, void *priv)
 299 {
 300         struct typhoon *dev = video_drvdata(file);
 301         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 302
 303         v4l2_info(v4l2_dev, BANNER);
 304 #ifdef MODULE
 305         v4l2_info(v4l2_dev, "Load type: Driver loaded as a module\n\n");
 306 #else
 307         v4l2_info(v4l2_dev, "Load type: Driver compiled into kernel\n\n");
 308 #endif
 309         v4l2_info(v4l2_dev, "frequency = %lu kHz\n", dev->curfreq >> 4);
 310         v4l2_info(v4l2_dev, "volume = %d\n", dev->curvol);
 311         v4l2_info(v4l2_dev, "mute = %s\n", dev->muted ?  "on" : "off");
 312         v4l2_info(v4l2_dev, "io = 0x%x\n", dev->io);
 313         v4l2_info(v4l2_dev, "mute frequency = %lu kHz\n", dev->mutefreq >> 4);
 314         return 0;
 315 }
 316
 317 static const struct v4l2_file_operations typhoon_fops = {
 318         .owner          = THIS_MODULE,
 319         .unlocked_ioctl = video_ioctl2,
 320 };
 321
 322 static const struct v4l2_ioctl_ops typhoon_ioctl_ops = {
 323         .vidioc_log_status  = vidioc_log_status,
 324         .vidioc_querycap    = vidioc_querycap,
 325         .vidioc_g_tuner     = vidioc_g_tuner,
 326         .vidioc_s_tuner     = vidioc_s_tuner,
 327         .vidioc_g_audio     = vidioc_g_audio,
 328         .vidioc_s_audio     = vidioc_s_audio,
 329         .vidioc_g_input     = vidioc_g_input,
 330         .vidioc_s_input     = vidioc_s_input,
 331         .vidioc_g_frequency = vidioc_g_frequency,
 332         .vidioc_s_frequency = vidioc_s_frequency,
 333         .vidioc_queryctrl   = vidioc_queryctrl,
 334         .vidioc_g_ctrl      = vidioc_g_ctrl,
 335         .vidioc_s_ctrl      = vidioc_s_ctrl,
 336 };
 337
 338 static int __init typhoon_init(void)
 339 {
 340         struct typhoon *dev = &typhoon_card;
 341         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 342         int res;
 343
 344         strlcpy(v4l2_dev->name, "typhoon", sizeof(v4l2_dev->name));
 345         dev->io = io;
 346
 347         if (dev->io == -1) {
 348                 v4l2_err(v4l2_dev, "You must set an I/O address with io=0x316 or io=0x336\n");
 349                 return -EINVAL;
 350         }
 351
 352         if (mutefreq < 87000 || mutefreq > 108500) {
 353                 v4l2_err(v4l2_dev, "You must set a frequency (in kHz) used when muting the card,\n");
 354                 v4l2_err(v4l2_dev, "e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
 355                 return -EINVAL;
 356         }
 357         dev->curfreq = dev->mutefreq = mutefreq << 4;
 358
 359         mutex_init(&dev->lock);
 360         if (!request_region(dev->io, 8, "typhoon")) {
 361                 v4l2_err(v4l2_dev, "port 0x%x already in use\n",
 362                        dev->io);
 363                 return -EBUSY;
 364         }
 365
 366         res = v4l2_device_register(NULL, v4l2_dev);
 367         if (res < 0) {
 368                 release_region(dev->io, 8);
 369                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 370                 return res;
 371         }
 372         v4l2_info(v4l2_dev, BANNER);
 373
 374         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 375         dev->vdev.v4l2_dev = v4l2_dev;
 376         dev->vdev.fops = &typhoon_fops;
 377         dev->vdev.ioctl_ops = &typhoon_ioctl_ops;
 378         dev->vdev.release = video_device_release_empty;
 379         video_set_drvdata(&dev->vdev, dev);
 380
 381         /* mute card - prevents noisy bootups */
 382         typhoon_mute(dev);
 383
 384         if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 385                 v4l2_device_unregister(&dev->v4l2_dev);
 386                 release_region(dev->io, 8);
 387                 return -EINVAL;
 388         }
 389         v4l2_info(v4l2_dev, "port 0x%x.\n", dev->io);
 390         v4l2_info(v4l2_dev, "mute frequency is %lu kHz.\n", mutefreq);
 391
 392         return 0;
 393 }
 394
 395 static void __exit typhoon_exit(void)
 396 {
 397         struct typhoon *dev = &typhoon_card;
 398
 399         video_unregister_device(&dev->vdev);
 400         v4l2_device_unregister(&dev->v4l2_dev);
 401         release_region(dev->io, 8);
 402 }
 403
 404 module_init(typhoon_init);
 405 module_exit(typhoon_exit);
 406