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/version.h>      /* for KERNEL_VERSION MACRO     */
  35 #include <linux/videodev2.h>    /* kernel radio structs           */
  36 #include <linux/io.h>           /* outb, outb_p                   */
  37 #include <media/v4l2-device.h>
  38 #include <media/v4l2-ioctl.h>
  39
  40 MODULE_AUTHOR("Dr. Henrik Seidel");
  41 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
  42 MODULE_LICENSE("GPL");
  43
  44 #ifndef CONFIG_RADIO_TYPHOON_PORT
  45 #define CONFIG_RADIO_TYPHOON_PORT -1
  46 #endif
  47
  48 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
  49 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
  50 #endif
  51
  52 static int io = CONFIG_RADIO_TYPHOON_PORT;
  53 static int radio_nr = -1;
  54
  55 module_param(io, int, 0);
  56 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
  57
  58 module_param(radio_nr, int, 0);
  59
  60 static unsigned long mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ;
  61 module_param(mutefreq, ulong, 0);
  62 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
  63
  64 #define RADIO_VERSION KERNEL_VERSION(0, 1, 1)
  65
  66 #define BANNER "Typhoon Radio Card driver v0.1.1\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->version = RADIO_VERSION;
 175         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 176         return 0;
 177 }
 178
 179 static int vidioc_g_tuner(struct file *file, void *priv,
 180                                         struct v4l2_tuner *v)
 181 {
 182         if (v->index > 0)
 183                 return -EINVAL;
 184
 185         strlcpy(v->name, "FM", sizeof(v->name));
 186         v->type = V4L2_TUNER_RADIO;
 187         v->rangelow = 87.5 * 16000;
 188         v->rangehigh = 108 * 16000;
 189         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 190         v->capability = V4L2_TUNER_CAP_LOW;
 191         v->audmode = V4L2_TUNER_MODE_MONO;
 192         v->signal = 0xFFFF;     /* We can't get the signal strength */
 193         return 0;
 194 }
 195
 196 static int vidioc_s_tuner(struct file *file, void *priv,
 197                                         struct v4l2_tuner *v)
 198 {
 199         return v->index ? -EINVAL : 0;
 200 }
 201
 202 static int vidioc_g_frequency(struct file *file, void *priv,
 203                                         struct v4l2_frequency *f)
 204 {
 205         struct typhoon *dev = video_drvdata(file);
 206
 207         if (f->tuner != 0)
 208                 return -EINVAL;
 209         f->type = V4L2_TUNER_RADIO;
 210         f->frequency = dev->curfreq;
 211         return 0;
 212 }
 213
 214 static int vidioc_s_frequency(struct file *file, void *priv,
 215                                         struct v4l2_frequency *f)
 216 {
 217         struct typhoon *dev = video_drvdata(file);
 218
 219         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 220                 return -EINVAL;
 221         dev->curfreq = f->frequency;
 222         typhoon_setfreq(dev, dev->curfreq);
 223         return 0;
 224 }
 225
 226 static int vidioc_queryctrl(struct file *file, void *priv,
 227                                         struct v4l2_queryctrl *qc)
 228 {
 229         switch (qc->id) {
 230         case V4L2_CID_AUDIO_MUTE:
 231                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 232         case V4L2_CID_AUDIO_VOLUME:
 233                 return v4l2_ctrl_query_fill(qc, 0, 65535, 16384, 65535);
 234         }
 235         return -EINVAL;
 236 }
 237
 238 static int vidioc_g_ctrl(struct file *file, void *priv,
 239                                         struct v4l2_control *ctrl)
 240 {
 241         struct typhoon *dev = video_drvdata(file);
 242
 243         switch (ctrl->id) {
 244         case V4L2_CID_AUDIO_MUTE:
 245                 ctrl->value = dev->muted;
 246                 return 0;
 247         case V4L2_CID_AUDIO_VOLUME:
 248                 ctrl->value = dev->curvol;
 249                 return 0;
 250         }
 251         return -EINVAL;
 252 }
 253
 254 static int vidioc_s_ctrl (struct file *file, void *priv,
 255                                         struct v4l2_control *ctrl)
 256 {
 257         struct typhoon *dev = video_drvdata(file);
 258
 259         switch (ctrl->id) {
 260         case V4L2_CID_AUDIO_MUTE:
 261                 if (ctrl->value)
 262                         typhoon_mute(dev);
 263                 else
 264                         typhoon_unmute(dev);
 265                 return 0;
 266         case V4L2_CID_AUDIO_VOLUME:
 267                 typhoon_setvol(dev, ctrl->value);
 268                 return 0;
 269         }
 270         return -EINVAL;
 271 }
 272
 273 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 274 {
 275         *i = 0;
 276         return 0;
 277 }
 278
 279 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 280 {
 281         return i ? -EINVAL : 0;
 282 }
 283
 284 static int vidioc_g_audio(struct file *file, void *priv,
 285                                         struct v4l2_audio *a)
 286 {
 287         a->index = 0;
 288         strlcpy(a->name, "Radio", sizeof(a->name));
 289         a->capability = V4L2_AUDCAP_STEREO;
 290         return 0;
 291 }
 292
 293 static int vidioc_s_audio(struct file *file, void *priv,
 294                                         struct v4l2_audio *a)
 295 {
 296         return a->index ? -EINVAL : 0;
 297 }
 298
 299 static int vidioc_log_status(struct file *file, void *priv)
 300 {
 301         struct typhoon *dev = video_drvdata(file);
 302         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 303
 304         v4l2_info(v4l2_dev, BANNER);
 305 #ifdef MODULE
 306         v4l2_info(v4l2_dev, "Load type: Driver loaded as a module\n\n");
 307 #else
 308         v4l2_info(v4l2_dev, "Load type: Driver compiled into kernel\n\n");
 309 #endif
 310         v4l2_info(v4l2_dev, "frequency = %lu kHz\n", dev->curfreq >> 4);
 311         v4l2_info(v4l2_dev, "volume = %d\n", dev->curvol);
 312         v4l2_info(v4l2_dev, "mute = %s\n", dev->muted ?  "on" : "off");
 313         v4l2_info(v4l2_dev, "io = 0x%x\n", dev->io);
 314         v4l2_info(v4l2_dev, "mute frequency = %lu kHz\n", dev->mutefreq >> 4);
 315         return 0;
 316 }
 317
 318 static const struct v4l2_file_operations typhoon_fops = {
 319         .owner          = THIS_MODULE,
 320         .unlocked_ioctl = video_ioctl2,
 321 };
 322
 323 static const struct v4l2_ioctl_ops typhoon_ioctl_ops = {
 324         .vidioc_log_status  = vidioc_log_status,
 325         .vidioc_querycap    = vidioc_querycap,
 326         .vidioc_g_tuner     = vidioc_g_tuner,
 327         .vidioc_s_tuner     = vidioc_s_tuner,
 328         .vidioc_g_audio     = vidioc_g_audio,
 329         .vidioc_s_audio     = vidioc_s_audio,
 330         .vidioc_g_input     = vidioc_g_input,
 331         .vidioc_s_input     = vidioc_s_input,
 332         .vidioc_g_frequency = vidioc_g_frequency,
 333         .vidioc_s_frequency = vidioc_s_frequency,
 334         .vidioc_queryctrl   = vidioc_queryctrl,
 335         .vidioc_g_ctrl      = vidioc_g_ctrl,
 336         .vidioc_s_ctrl      = vidioc_s_ctrl,
 337 };
 338
 339 static int __init typhoon_init(void)
 340 {
 341         struct typhoon *dev = &typhoon_card;
 342         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 343         int res;
 344
 345         strlcpy(v4l2_dev->name, "typhoon", sizeof(v4l2_dev->name));
 346         dev->io = io;
 347
 348         if (dev->io == -1) {
 349                 v4l2_err(v4l2_dev, "You must set an I/O address with io=0x316 or io=0x336\n");
 350                 return -EINVAL;
 351         }
 352
 353         if (mutefreq < 87000 || mutefreq > 108500) {
 354                 v4l2_err(v4l2_dev, "You must set a frequency (in kHz) used when muting the card,\n");
 355                 v4l2_err(v4l2_dev, "e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
 356                 return -EINVAL;
 357         }
 358         dev->curfreq = dev->mutefreq = mutefreq << 4;
 359
 360         mutex_init(&dev->lock);
 361         if (!request_region(dev->io, 8, "typhoon")) {
 362                 v4l2_err(v4l2_dev, "port 0x%x already in use\n",
 363                        dev->io);
 364                 return -EBUSY;
 365         }
 366
 367         res = v4l2_device_register(NULL, v4l2_dev);
 368         if (res < 0) {
 369                 release_region(dev->io, 8);
 370                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 371                 return res;
 372         }
 373         v4l2_info(v4l2_dev, BANNER);
 374
 375         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 376         dev->vdev.v4l2_dev = v4l2_dev;
 377         dev->vdev.fops = &typhoon_fops;
 378         dev->vdev.ioctl_ops = &typhoon_ioctl_ops;
 379         dev->vdev.release = video_device_release_empty;
 380         video_set_drvdata(&dev->vdev, dev);
 381
 382         /* mute card - prevents noisy bootups */
 383         typhoon_mute(dev);
 384
 385         if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 386                 v4l2_device_unregister(&dev->v4l2_dev);
 387                 release_region(dev->io, 8);
 388                 return -EINVAL;
 389         }
 390         v4l2_info(v4l2_dev, "port 0x%x.\n", dev->io);
 391         v4l2_info(v4l2_dev, "mute frequency is %lu kHz.\n", mutefreq);
 392
 393         return 0;
 394 }
 395
 396 static void __exit typhoon_exit(void)
 397 {
 398         struct typhoon *dev = &typhoon_card;
 399
 400         video_unregister_device(&dev->vdev);
 401         v4l2_device_unregister(&dev->v4l2_dev);
 402         release_region(dev->io, 8);
 403 }
 404
 405 module_init(typhoon_init);
 406 module_exit(typhoon_exit);
 407