drivers/media/radio/radio-sf16fmr2.c

   1 /* SF16FMR2 radio driver for Linux radio support
   2  * heavily based on fmi driver...
   3  * (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
   4  *
   5  * Notes on the hardware
   6  *
   7  *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
   8  *  No volume control - only mute/unmute - you have to use line volume
   9  *
  10  *  For read stereo/mono you must wait 0.1 sec after set frequency and
  11  *  card unmuted so I set frequency on unmute
  12  *  Signal handling seem to work only on autoscanning (not implemented)
  13  */
  14
  15 #include <linux/module.h>       /* Modules                      */
  16 #include <linux/init.h>         /* Initdata                     */
  17 #include <linux/ioport.h>       /* request_region               */
  18 #include <linux/delay.h>        /* udelay                       */
  19 #include <asm/io.h>             /* outb, outb_p                 */
  20 #include <asm/uaccess.h>        /* copy to/from user            */
  21 #include <linux/videodev.h>     /* kernel radio structs         */
  22 #include <asm/semaphore.h>
  23
  24 static struct semaphore lock;
  25
  26 #undef DEBUG
  27 //#define DEBUG 1
  28
  29 #ifdef DEBUG
  30 # define  debug_print(s) printk s
  31 #else
  32 # define  debug_print(s)
  33 #endif
  34
  35 /* this should be static vars for module size */
  36 struct fmr2_device
  37 {
  38         int port;
  39         int curvol; /* 0-65535, if not volume 0 or 65535 */
  40         int mute;
  41         int stereo; /* card is producing stereo audio */
  42         unsigned long curfreq; /* freq in kHz */
  43         int card_type;
  44         __u32 flags;
  45 };
  46
  47 static int io = 0x384;
  48 static int radio_nr = -1;
  49
  50 /* hw precision is 12.5 kHz
  51  * It is only usefull to give freq in intervall of 200 (=0.0125Mhz),
  52  * other bits will be truncated
  53  */
  54 #define RSF16_ENCODE(x) ((x)/200+856)
  55 #define RSF16_MINFREQ 87*16000
  56 #define RSF16_MAXFREQ 108*16000
  57
  58 static inline void wait(int n,int port)
  59 {
  60         for (;n;--n) inb(port);
  61 }
  62
  63 static void outbits(int bits, unsigned int data, int nWait, int port)
  64 {
  65         int bit;
  66         for(;--bits>=0;) {
  67                 bit = (data>>bits) & 1;
  68                 outb(bit,port);
  69                 wait(nWait,port);
  70                 outb(bit|2,port);
  71                 wait(nWait,port);
  72                 outb(bit,port);
  73                 wait(nWait,port);
  74         }
  75 }
  76
  77 static inline void fmr2_mute(int port)
  78 {
  79         outb(0x00, port);
  80         wait(4,port);
  81 }
  82
  83 static inline void fmr2_unmute(int port)
  84 {
  85         outb(0x04, port);
  86         wait(4,port);
  87 }
  88
  89 static inline int fmr2_stereo_mode(int port)
  90 {
  91         int n = inb(port);
  92         outb(6,port);
  93         inb(port);
  94         n = ((n>>3)&1)^1;
  95         debug_print((KERN_DEBUG "stereo: %d\n", n));
  96         return n;
  97 }
  98
  99 static int fmr2_product_info(struct fmr2_device *dev)
 100 {
 101         int n = inb(dev->port);
 102         n &= 0xC1;
 103         if (n == 0)
 104         {
 105                 /* this should support volume set */
 106                 dev->card_type = 12;
 107                 return 0;
 108         }
 109         /* not volume (mine is 11) */
 110         dev->card_type = (n==128)?11:0;
 111         return n;
 112 }
 113
 114 static inline int fmr2_getsigstr(struct fmr2_device *dev)
 115 {
 116         /* !!! work only if scanning freq */
 117         int port = dev->port, res = 0xffff;
 118         outb(5,port);
 119         wait(4,port);
 120         if (!(inb(port)&1)) res = 0;
 121         debug_print((KERN_DEBUG "signal: %d\n", res));
 122         return res;
 123 }
 124
 125 /* set frequency and unmute card */
 126 static int fmr2_setfreq(struct fmr2_device *dev)
 127 {
 128         int port = dev->port;
 129         unsigned long freq = dev->curfreq;
 130
 131         fmr2_mute(port);
 132
 133         /* 0x42 for mono output
 134          * 0x102 forward scanning
 135          * 0x182 scansione avanti
 136          */
 137         outbits(9,0x2,3,port);
 138         outbits(16,RSF16_ENCODE(freq),2,port);
 139
 140         fmr2_unmute(port);
 141
 142         /* wait 0.11 sec */
 143         msleep(110);
 144
 145         /* NOTE if mute this stop radio
 146            you must set freq on unmute */
 147         dev->stereo = fmr2_stereo_mode(port);
 148         return 0;
 149 }
 150
 151 /* !!! not tested, in my card this does't work !!! */
 152 static int fmr2_setvolume(struct fmr2_device *dev)
 153 {
 154         int i,a,n, port = dev->port;
 155
 156         if (dev->card_type != 11) return 1;
 157
 158         switch( (dev->curvol+(1<<11)) >> 12 )
 159         {
 160         case 0: case 1: n = 0x21; break;
 161         case 2: n = 0x84; break;
 162         case 3: n = 0x90; break;
 163         case 4: n = 0x104; break;
 164         case 5: n = 0x110; break;
 165         case 6: n = 0x204; break;
 166         case 7: n = 0x210; break;
 167         case 8: n = 0x402; break;
 168         case 9: n = 0x404; break;
 169         default:
 170         case 10: n = 0x408; break;
 171         case 11: n = 0x410; break;
 172         case 12: n = 0x801; break;
 173         case 13: n = 0x802; break;
 174         case 14: n = 0x804; break;
 175         case 15: n = 0x808; break;
 176         case 16: n = 0x810; break;
 177         }
 178         for(i=12;--i>=0;)
 179         {
 180                 a = ((n >> i) & 1) << 6; /* if (a=0) a= 0; else a= 0x40; */
 181                 outb(a|4, port);
 182                 wait(4,port);
 183                 outb(a|0x24, port);
 184                 wait(4,port);
 185                 outb(a|4, port);
 186                 wait(4,port);
 187         }
 188         for(i=6;--i>=0;)
 189         {
 190                 a = ((0x18 >> i) & 1) << 6;
 191                 outb(a|4, port);
 192                 wait(4,port);
 193                 outb(a|0x24, port);
 194                 wait(4,port);
 195                 outb(a|4, port);
 196                 wait(4,port);
 197         }
 198         wait(4,port);
 199         outb(0x14, port);
 200
 201         return 0;
 202 }
 203
 204 static int fmr2_do_ioctl(struct inode *inode, struct file *file,
 205                       unsigned int cmd, void *arg)
 206 {
 207         struct video_device *dev = video_devdata(file);
 208         struct fmr2_device *fmr2 = dev->priv;
 209         debug_print((KERN_DEBUG "freq %ld flags %d vol %d mute %d "
 210                 "stereo %d type %d\n",
 211                 fmr2->curfreq, fmr2->flags, fmr2->curvol, fmr2->mute,
 212                 fmr2->stereo, fmr2->card_type));
 213
 214         switch(cmd)
 215         {
 216                 case VIDIOCGCAP:
 217                 {
 218                         struct video_capability *v = arg;
 219                         memset(v,0,sizeof(*v));
 220                         strcpy(v->name, "SF16-FMR2 radio");
 221                         v->type=VID_TYPE_TUNER;
 222                         v->channels=1;
 223                         v->audios=1;
 224                         return 0;
 225                 }
 226                 case VIDIOCGTUNER:
 227                 {
 228                         struct video_tuner *v = arg;
 229                         int mult;
 230
 231                         if(v->tuner)     /* Only 1 tuner */
 232                                 return -EINVAL;
 233                         strcpy(v->name, "FM");
 234                         mult = (fmr2->flags & VIDEO_TUNER_LOW) ? 1 : 1000;
 235                         v->rangelow = RSF16_MINFREQ/mult;
 236                         v->rangehigh = RSF16_MAXFREQ/mult;
 237                         v->flags = fmr2->flags | VIDEO_AUDIO_MUTABLE;
 238                         if (fmr2->mute)
 239                                 v->flags |= VIDEO_AUDIO_MUTE;
 240                         v->mode=VIDEO_MODE_AUTO;
 241                         down(&lock);
 242                         v->signal = fmr2_getsigstr(fmr2);
 243                         up(&lock);
 244                         return 0;
 245                 }
 246                 case VIDIOCSTUNER:
 247                 {
 248                         struct video_tuner *v = arg;
 249                         if (v->tuner!=0)
 250                                 return -EINVAL;
 251                         fmr2->flags = v->flags & VIDEO_TUNER_LOW;
 252                         return 0;
 253                 }
 254                 case VIDIOCGFREQ:
 255                 {
 256                         unsigned long *freq = arg;
 257                         *freq = fmr2->curfreq;
 258                         if (!(fmr2->flags & VIDEO_TUNER_LOW))
 259                                 *freq /= 1000;
 260                         return 0;
 261                 }
 262                 case VIDIOCSFREQ:
 263                 {
 264                         unsigned long *freq = arg;
 265                         if (!(fmr2->flags & VIDEO_TUNER_LOW))
 266                                 *freq *= 1000;
 267                         if ( *freq < RSF16_MINFREQ || *freq > RSF16_MAXFREQ )
 268                                 return -EINVAL;
 269                         /* rounding in steps of 200 to match th freq
 270                          * that will be used
 271                          */
 272                         fmr2->curfreq = (*freq/200)*200;
 273
 274                         /* set card freq (if not muted) */
 275                         if (fmr2->curvol && !fmr2->mute)
 276                         {
 277                                 down(&lock);
 278                                 fmr2_setfreq(fmr2);
 279                                 up(&lock);
 280                         }
 281                         return 0;
 282                 }
 283                 case VIDIOCGAUDIO:
 284                 {
 285                         struct video_audio *v = arg;
 286                         memset(v,0,sizeof(*v));
 287                         /* !!! do not return VIDEO_AUDIO_MUTE */
 288                         v->flags = VIDEO_AUDIO_MUTABLE;
 289                         strcpy(v->name, "Radio");
 290                         /* get current stereo mode */
 291                         v->mode = fmr2->stereo ? VIDEO_SOUND_STEREO: VIDEO_SOUND_MONO;
 292                         /* volume supported ? */
 293                         if (fmr2->card_type == 11)
 294                         {
 295                                 v->flags |= VIDEO_AUDIO_VOLUME;
 296                                 v->step = 1 << 12;
 297                                 v->volume = fmr2->curvol;
 298                         }
 299                         debug_print((KERN_DEBUG "Get flags %d vol %d\n", v->flags, v->volume));
 300                         return 0;
 301                 }
 302                 case VIDIOCSAUDIO:
 303                 {
 304                         struct video_audio *v = arg;
 305                         if(v->audio)
 306                                 return -EINVAL;
 307                         debug_print((KERN_DEBUG "Set flags %d vol %d\n", v->flags, v->volume));
 308                         /* set volume */
 309                         if (v->flags & VIDEO_AUDIO_VOLUME)
 310                                 fmr2->curvol = v->volume; /* !!! set with precision */
 311                         if (fmr2->card_type != 11) fmr2->curvol = 65535;
 312                         fmr2->mute = 0;
 313                         if (v->flags & VIDEO_AUDIO_MUTE)
 314                                 fmr2->mute = 1;
 315 #ifdef DEBUG
 316                         if (fmr2->curvol && !fmr2->mute)
 317                                 printk(KERN_DEBUG "unmute\n");
 318                         else
 319                                 printk(KERN_DEBUG "mute\n");
 320 #endif
 321                         down(&lock);
 322                         if (fmr2->curvol && !fmr2->mute)
 323                         {
 324                                 fmr2_setvolume(fmr2);
 325                                 fmr2_setfreq(fmr2);
 326                         }
 327                         else fmr2_mute(fmr2->port);
 328                         up(&lock);
 329                         return 0;
 330                 }
 331                 case VIDIOCGUNIT:
 332                 {
 333                         struct video_unit *v = arg;
 334                         v->video=VIDEO_NO_UNIT;
 335                         v->vbi=VIDEO_NO_UNIT;
 336                         v->radio=dev->minor;
 337                         v->audio=0; /* How do we find out this??? */
 338                         v->teletext=VIDEO_NO_UNIT;
 339                         return 0;
 340                 }
 341                 default:
 342                         return -ENOIOCTLCMD;
 343         }
 344 }
 345
 346 static int fmr2_ioctl(struct inode *inode, struct file *file,
 347                       unsigned int cmd, unsigned long arg)
 348  {
 349         return video_usercopy(inode, file, cmd, arg, fmr2_do_ioctl);
 350 }
 351
 352 static struct fmr2_device fmr2_unit;
 353
 354 static struct file_operations fmr2_fops = {
 355         .owner          = THIS_MODULE,
 356         .open           = video_exclusive_open,
 357         .release        = video_exclusive_release,
 358         .ioctl          = fmr2_ioctl,
 359         .llseek         = no_llseek,
 360 };
 361
 362 static struct video_device fmr2_radio=
 363 {
 364         .owner          = THIS_MODULE,
 365         .name           = "SF16FMR2 radio",
 366         . type          = VID_TYPE_TUNER,
 367         .hardware       = VID_HARDWARE_SF16FMR2,
 368         .fops           = &fmr2_fops,
 369 };
 370
 371 static int __init fmr2_init(void)
 372 {
 373         fmr2_unit.port = io;
 374         fmr2_unit.curvol = 0;
 375         fmr2_unit.mute = 0;
 376         fmr2_unit.curfreq = 0;
 377         fmr2_unit.stereo = 1;
 378         fmr2_unit.flags = VIDEO_TUNER_LOW;
 379         fmr2_unit.card_type = 0;
 380         fmr2_radio.priv = &fmr2_unit;
 381
 382         init_MUTEX(&lock);
 383
 384         if (request_region(io, 2, "sf16fmr2"))
 385         {
 386                 printk(KERN_ERR "fmr2: port 0x%x already in use\n", io);
 387                 return -EBUSY;
 388         }
 389
 390         if(video_register_device(&fmr2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 391         {
 392                 release_region(io, 2);
 393                 return -EINVAL;
 394         }
 395
 396         printk(KERN_INFO "SF16FMR2 radio card driver at 0x%x.\n", io);
 397         debug_print((KERN_DEBUG "Mute %d Low %d\n",VIDEO_AUDIO_MUTE,VIDEO_TUNER_LOW));
 398         /* mute card - prevents noisy bootups */
 399         down(&lock);
 400         fmr2_mute(io);
 401         fmr2_product_info(&fmr2_unit);
 402         up(&lock);
 403         debug_print((KERN_DEBUG "card_type %d\n", fmr2_unit.card_type));
 404         return 0;
 405 }
 406
 407 MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
 408 MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
 409 MODULE_LICENSE("GPL");
 410
 411 module_param(io, int, 0);
 412 MODULE_PARM_DESC(io, "I/O address of the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
 413 module_param(radio_nr, int, 0);
 414
 415 static void __exit fmr2_cleanup_module(void)
 416 {
 417         video_unregister_device(&fmr2_radio);
 418         release_region(io,2);
 419 }
 420
 421 module_init(fmr2_init);
 422 module_exit(fmr2_cleanup_module);
 423
 424 #ifndef MODULE
 425
 426 static int __init fmr2_setup_io(char *str)
 427 {
 428         get_option(&str, &io);
 429         return 1;
 430 }
 431
 432 __setup("sf16fmr2=", fmr2_setup_io);
 433
 434 #endif