drivers/media/radio/radio-aimslab.c

   1 /* radiotrack (radioreveal) driver for Linux radio support
   2  * (c) 1997 M. Kirkwood
   3  * Converted to new API by Alan Cox <Alan.Cox@linux.org>
   4  * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
   5  *
   6  * History:
   7  * 1999-02-24   Russell Kroll <rkroll@exploits.org>
   8  *              Fine tuning/VIDEO_TUNER_LOW
   9  *              Frequency range expanded to start at 87 MHz
  10  *
  11  * TODO: Allow for more than one of these foolish entities :-)
  12  *
  13  * Notes on the hardware (reverse engineered from other peoples'
  14  * reverse engineering of AIMS' code :-)
  15  *
  16  *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
  17  *
  18  *  The signal strength query is unsurprisingly inaccurate.  And it seems
  19  *  to indicate that (on my card, at least) the frequency setting isn't
  20  *  too great.  (I have to tune up .025MHz from what the freq should be
  21  *  to get a report that the thing is tuned.)
  22  *
  23  *  Volume control is (ugh) analogue:
  24  *   out(port, start_increasing_volume);
  25  *   wait(a_wee_while);
  26  *   out(port, stop_changing_the_volume);
  27  *
  28  */
  29
  30 #include <linux/module.h>       /* Modules                      */
  31 #include <linux/init.h>         /* Initdata                     */
  32 #include <linux/ioport.h>       /* check_region, request_region */
  33 #include <linux/delay.h>        /* udelay                       */
  34 #include <asm/io.h>             /* outb, outb_p                 */
  35 #include <asm/uaccess.h>        /* copy to/from user            */
  36 #include <linux/videodev.h>     /* kernel radio structs         */
  37 #include <linux/config.h>       /* CONFIG_RADIO_RTRACK_PORT     */
  38 #include <asm/semaphore.h>      /* Lock for the I/O             */
  39
  40 #ifndef CONFIG_RADIO_RTRACK_PORT
  41 #define CONFIG_RADIO_RTRACK_PORT -1
  42 #endif
  43
  44 static int io = CONFIG_RADIO_RTRACK_PORT;
  45 static int radio_nr = -1;
  46 static struct semaphore lock;
  47
  48 struct rt_device
  49 {
  50         int port;
  51         int curvol;
  52         unsigned long curfreq;
  53         int muted;
  54 };
  55
  56
  57 /* local things */
  58
  59 static void sleep_delay(long n)
  60 {
  61         /* Sleep nicely for 'n' uS */
  62         int d=n/(1000000/HZ);
  63         if(!d)
  64                 udelay(n);
  65         else
  66                 msleep(jiffies_to_msecs(d));
  67 }
  68
  69 static void rt_decvol(void)
  70 {
  71         outb(0x58, io);         /* volume down + sigstr + on    */
  72         sleep_delay(100000);
  73         outb(0xd8, io);         /* volume steady + sigstr + on  */
  74 }
  75
  76 static void rt_incvol(void)
  77 {
  78         outb(0x98, io);         /* volume up + sigstr + on      */
  79         sleep_delay(100000);
  80         outb(0xd8, io);         /* volume steady + sigstr + on  */
  81 }
  82
  83 static void rt_mute(struct rt_device *dev)
  84 {
  85         dev->muted = 1;
  86         down(&lock);
  87         outb(0xd0, io);                 /* volume steady, off           */
  88         up(&lock);
  89 }
  90
  91 static int rt_setvol(struct rt_device *dev, int vol)
  92 {
  93         int i;
  94
  95         down(&lock);
  96
  97         if(vol == dev->curvol) {        /* requested volume = current */
  98                 if (dev->muted) {       /* user is unmuting the card  */
  99                         dev->muted = 0;
 100                         outb (0xd8, io);        /* enable card */
 101                 }
 102                 up(&lock);
 103                 return 0;
 104         }
 105
 106         if(vol == 0) {                  /* volume = 0 means mute the card */
 107                 outb(0x48, io);         /* volume down but still "on"   */
 108                 sleep_delay(2000000);   /* make sure it's totally down  */
 109                 outb(0xd0, io);         /* volume steady, off           */
 110                 dev->curvol = 0;        /* track the volume state!      */
 111                 up(&lock);
 112                 return 0;
 113         }
 114
 115         dev->muted = 0;
 116         if(vol > dev->curvol)
 117                 for(i = dev->curvol; i < vol; i++)
 118                         rt_incvol();
 119         else
 120                 for(i = dev->curvol; i > vol; i--)
 121                         rt_decvol();
 122
 123         dev->curvol = vol;
 124         up(&lock);
 125         return 0;
 126 }
 127
 128 /* the 128+64 on these outb's is to keep the volume stable while tuning
 129  * without them, the volume _will_ creep up with each frequency change
 130  * and bit 4 (+16) is to keep the signal strength meter enabled
 131  */
 132
 133 static void send_0_byte(int port, struct rt_device *dev)
 134 {
 135         if ((dev->curvol == 0) || (dev->muted)) {
 136                 outb_p(128+64+16+  1, port);   /* wr-enable + data low */
 137                 outb_p(128+64+16+2+1, port);   /* clock */
 138         }
 139         else {
 140                 outb_p(128+64+16+8+  1, port);  /* on + wr-enable + data low */
 141                 outb_p(128+64+16+8+2+1, port);  /* clock */
 142         }
 143         sleep_delay(1000);
 144 }
 145
 146 static void send_1_byte(int port, struct rt_device *dev)
 147 {
 148         if ((dev->curvol == 0) || (dev->muted)) {
 149                 outb_p(128+64+16+4  +1, port);   /* wr-enable+data high */
 150                 outb_p(128+64+16+4+2+1, port);   /* clock */
 151         }
 152         else {
 153                 outb_p(128+64+16+8+4  +1, port); /* on+wr-enable+data high */
 154                 outb_p(128+64+16+8+4+2+1, port); /* clock */
 155         }
 156
 157         sleep_delay(1000);
 158 }
 159
 160 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
 161 {
 162         int i;
 163
 164         /* adapted from radio-aztech.c */
 165
 166         /* now uses VIDEO_TUNER_LOW for fine tuning */
 167
 168         freq += 171200;                 /* Add 10.7 MHz IF              */
 169         freq /= 800;                    /* Convert to 50 kHz units      */
 170
 171         down(&lock);                    /* Stop other ops interfering */
 172
 173         send_0_byte (io, dev);          /*  0: LSB of frequency         */
 174
 175         for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)    */
 176                 if (freq & (1 << i))
 177                         send_1_byte (io, dev);
 178                 else
 179                         send_0_byte (io, dev);
 180
 181         send_0_byte (io, dev);          /* 14: test bit - always 0    */
 182         send_0_byte (io, dev);          /* 15: test bit - always 0    */
 183
 184         send_0_byte (io, dev);          /* 16: band data 0 - always 0 */
 185         send_0_byte (io, dev);          /* 17: band data 1 - always 0 */
 186         send_0_byte (io, dev);          /* 18: band data 2 - always 0 */
 187         send_0_byte (io, dev);          /* 19: time base - always 0   */
 188
 189         send_0_byte (io, dev);          /* 20: spacing (0 = 25 kHz)   */
 190         send_1_byte (io, dev);          /* 21: spacing (1 = 25 kHz)   */
 191         send_0_byte (io, dev);          /* 22: spacing (0 = 25 kHz)   */
 192         send_1_byte (io, dev);          /* 23: AM/FM (FM = 1, always) */
 193
 194         if ((dev->curvol == 0) || (dev->muted))
 195                 outb (0xd0, io);        /* volume steady + sigstr */
 196         else
 197                 outb (0xd8, io);        /* volume steady + sigstr + on */
 198
 199         up(&lock);
 200
 201         return 0;
 202 }
 203
 204 static int rt_getsigstr(struct rt_device *dev)
 205 {
 206         if (inb(io) & 2)        /* bit set = no signal present  */
 207                 return 0;
 208         return 1;               /* signal present               */
 209 }
 210
 211 static int rt_do_ioctl(struct inode *inode, struct file *file,
 212                        unsigned int cmd, void *arg)
 213 {
 214         struct video_device *dev = video_devdata(file);
 215         struct rt_device *rt=dev->priv;
 216
 217         switch(cmd)
 218         {
 219                 case VIDIOCGCAP:
 220                 {
 221                         struct video_capability *v = arg;
 222                         memset(v,0,sizeof(*v));
 223                         v->type=VID_TYPE_TUNER;
 224                         v->channels=1;
 225                         v->audios=1;
 226                         strcpy(v->name, "RadioTrack");
 227                         return 0;
 228                 }
 229                 case VIDIOCGTUNER:
 230                 {
 231                         struct video_tuner *v = arg;
 232                         if(v->tuner)    /* Only 1 tuner */
 233                                 return -EINVAL;
 234                         v->rangelow=(87*16000);
 235                         v->rangehigh=(108*16000);
 236                         v->flags=VIDEO_TUNER_LOW;
 237                         v->mode=VIDEO_MODE_AUTO;
 238                         strcpy(v->name, "FM");
 239                         v->signal=0xFFFF*rt_getsigstr(rt);
 240                         return 0;
 241                 }
 242                 case VIDIOCSTUNER:
 243                 {
 244                         struct video_tuner *v = arg;
 245                         if(v->tuner!=0)
 246                                 return -EINVAL;
 247                         /* Only 1 tuner so no setting needed ! */
 248                         return 0;
 249                 }
 250                 case VIDIOCGFREQ:
 251                 {
 252                         unsigned long *freq = arg;
 253                         *freq = rt->curfreq;
 254                         return 0;
 255                 }
 256                 case VIDIOCSFREQ:
 257                 {
 258                         unsigned long *freq = arg;
 259                         rt->curfreq = *freq;
 260                         rt_setfreq(rt, rt->curfreq);
 261                         return 0;
 262                 }
 263                 case VIDIOCGAUDIO:
 264                 {
 265                         struct video_audio *v = arg;
 266                         memset(v,0, sizeof(*v));
 267                         v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
 268                         v->volume=rt->curvol * 6554;
 269                         v->step=6554;
 270                         strcpy(v->name, "Radio");
 271                         return 0;
 272                 }
 273                 case VIDIOCSAUDIO:
 274                 {
 275                         struct video_audio *v = arg;
 276                         if(v->audio)
 277                                 return -EINVAL;
 278                         if(v->flags&VIDEO_AUDIO_MUTE)
 279                                 rt_mute(rt);
 280                         else
 281                                 rt_setvol(rt,v->volume/6554);
 282                         return 0;
 283                 }
 284                 default:
 285                         return -ENOIOCTLCMD;
 286         }
 287 }
 288
 289 static int rt_ioctl(struct inode *inode, struct file *file,
 290                     unsigned int cmd, unsigned long arg)
 291 {
 292         return video_usercopy(inode, file, cmd, arg, rt_do_ioctl);
 293 }
 294
 295 static struct rt_device rtrack_unit;
 296
 297 static struct file_operations rtrack_fops = {
 298         .owner          = THIS_MODULE,
 299         .open           = video_exclusive_open,
 300         .release        = video_exclusive_release,
 301         .ioctl          = rt_ioctl,
 302         .llseek         = no_llseek,
 303 };
 304
 305 static struct video_device rtrack_radio=
 306 {
 307         .owner          = THIS_MODULE,
 308         .name           = "RadioTrack radio",
 309         .type           = VID_TYPE_TUNER,
 310         .hardware       = VID_HARDWARE_RTRACK,
 311         .fops           = &rtrack_fops,
 312 };
 313
 314 static int __init rtrack_init(void)
 315 {
 316         if(io==-1)
 317         {
 318                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 319                 return -EINVAL;
 320         }
 321
 322         if (!request_region(io, 2, "rtrack"))
 323         {
 324                 printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
 325                 return -EBUSY;
 326         }
 327
 328         rtrack_radio.priv=&rtrack_unit;
 329
 330         if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 331         {
 332                 release_region(io, 2);
 333                 return -EINVAL;
 334         }
 335         printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");
 336
 337         /* Set up the I/O locking */
 338
 339         init_MUTEX(&lock);
 340
 341         /* mute card - prevents noisy bootups */
 342
 343         /* this ensures that the volume is all the way down  */
 344         outb(0x48, io);         /* volume down but still "on"   */
 345         sleep_delay(2000000);   /* make sure it's totally down  */
 346         outb(0xc0, io);         /* steady volume, mute card     */
 347         rtrack_unit.curvol = 0;
 348
 349         return 0;
 350 }
 351
 352 MODULE_AUTHOR("M.Kirkwood");
 353 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
 354 MODULE_LICENSE("GPL");
 355
 356 module_param(io, int, 0);
 357 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
 358 module_param(radio_nr, int, 0);
 359
 360 static void __exit cleanup_rtrack_module(void)
 361 {
 362         video_unregister_device(&rtrack_radio);
 363         release_region(io,2);
 364 }
 365
 366 module_init(rtrack_init);
 367 module_exit(cleanup_rtrack_module);
 368