drivers/media/radio/radio-terratec.c

   1 /* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
   2  * (c) 1999 R. Offermanns (rolf@offermanns.de)
   3  * based on the aimslab radio driver from M. Kirkwood
   4  * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
   5  *
   6  *
   7  * History:
   8  * 1999-05-21   First preview release
   9  *
  10  *  Notes on the hardware:
  11  *  There are two "main" chips on the card:
  12  *  - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
  13  *  - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
  14  *  (you can get the datasheet at the above links)
  15  *
  16  *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
  17  *  Volume Control is done digitally
  18  *
  19  *  there is a I2C controlled RDS decoder (SAA6588)  onboard, which i would like to support someday
  20  *  (as soon i have understand how to get started :)
  21  *  If you can help me out with that, please contact me!!
  22  *
  23  *
  24  */
  25
  26 #include <linux/module.h>       /* Modules                      */
  27 #include <linux/init.h>         /* Initdata                     */
  28 #include <linux/ioport.h>       /* check_region, request_region */
  29 #include <linux/delay.h>        /* udelay                       */
  30 #include <asm/io.h>             /* outb, outb_p                 */
  31 #include <asm/uaccess.h>        /* copy to/from user            */
  32 #include <linux/videodev.h>     /* kernel radio structs         */
  33 #include <linux/config.h>       /* CONFIG_RADIO_TERRATEC_PORT   */
  34 #include <linux/spinlock.h>
  35
  36 #ifndef CONFIG_RADIO_TERRATEC_PORT
  37 #define CONFIG_RADIO_TERRATEC_PORT 0x590
  38 #endif
  39
  40 /**************** this ones are for the terratec *******************/
  41 #define BASEPORT        0x590
  42 #define VOLPORT         0x591
  43 #define WRT_DIS         0x00
  44 #define CLK_OFF         0x00
  45 #define IIC_DATA        0x01
  46 #define IIC_CLK         0x02
  47 #define DATA            0x04
  48 #define CLK_ON          0x08
  49 #define WRT_EN          0x10
  50 /*******************************************************************/
  51
  52 static int io = CONFIG_RADIO_TERRATEC_PORT;
  53 static int radio_nr = -1;
  54 static spinlock_t lock;
  55
  56 struct tt_device
  57 {
  58         int port;
  59         int curvol;
  60         unsigned long curfreq;
  61         int muted;
  62 };
  63
  64
  65 /* local things */
  66
  67 static void cardWriteVol(int volume)
  68 {
  69         int i;
  70         volume = volume+(volume * 32); // change both channels
  71         spin_lock(&lock);
  72         for (i=0;i<8;i++)
  73         {
  74                 if (volume & (0x80>>i))
  75                         outb(0x80, VOLPORT);
  76                 else outb(0x00, VOLPORT);
  77         }
  78         spin_unlock(&lock);
  79 }
  80
  81
  82
  83 static void tt_mute(struct tt_device *dev)
  84 {
  85         dev->muted = 1;
  86         cardWriteVol(0);
  87 }
  88
  89 static int tt_setvol(struct tt_device *dev, int vol)
  90 {
  91
  92 //      printk(KERN_ERR "setvol called, vol = %d\n", vol);
  93
  94         if(vol == dev->curvol) {        /* requested volume = current */
  95                 if (dev->muted) {       /* user is unmuting the card  */
  96                         dev->muted = 0;
  97                         cardWriteVol(vol);      /* enable card */
  98                 }
  99
 100                 return 0;
 101         }
 102
 103         if(vol == 0) {                  /* volume = 0 means mute the card */
 104                 cardWriteVol(0);        /* "turn off card" by setting vol to 0 */
 105                 dev->curvol = vol;      /* track the volume state!      */
 106                 return 0;
 107         }
 108
 109         dev->muted = 0;
 110
 111         cardWriteVol(vol);
 112
 113         dev->curvol = vol;
 114
 115         return 0;
 116
 117 }
 118
 119
 120 /* this is the worst part in this driver */
 121 /* many more or less strange things are going on here, but hey, it works :) */
 122
 123 static int tt_setfreq(struct tt_device *dev, unsigned long freq1)
 124 {
 125         int freq;
 126         int i;
 127         int p;
 128         int  temp;
 129         long rest;
 130
 131         unsigned char buffer[25];               /* we have to bit shift 25 registers */
 132         freq = freq1/160;                       /* convert the freq. to a nice to handle value */
 133         for(i=24;i>-1;i--)
 134                 buffer[i]=0;
 135
 136         rest = freq*10+10700;           /* i once had understood what is going on here */
 137                                         /* maybe some wise guy (friedhelm?) can comment this stuff */
 138         i=13;
 139         p=10;
 140         temp=102400;
 141         while (rest!=0)
 142         {
 143                 if (rest%temp  == rest)
 144                         buffer[i] = 0;
 145                 else
 146                 {
 147                         buffer[i] = 1;
 148                         rest = rest-temp;
 149                 }
 150                 i--;
 151                 p--;
 152                 temp = temp/2;
 153        }
 154
 155         spin_lock(&lock);
 156
 157         for (i=24;i>-1;i--)                     /* bit shift the values to the radiocard */
 158         {
 159                 if (buffer[i]==1)
 160                 {
 161                         outb(WRT_EN|DATA, BASEPORT);
 162                         outb(WRT_EN|DATA|CLK_ON  , BASEPORT);
 163                         outb(WRT_EN|DATA, BASEPORT);
 164                 }
 165                 else
 166                 {
 167                         outb(WRT_EN|0x00, BASEPORT);
 168                         outb(WRT_EN|0x00|CLK_ON  , BASEPORT);
 169                 }
 170         }
 171         outb(0x00, BASEPORT);
 172
 173         spin_unlock(&lock);
 174
 175         return 0;
 176 }
 177
 178 static int tt_getsigstr(struct tt_device *dev)          /* TODO */
 179 {
 180         if (inb(io) & 2)        /* bit set = no signal present  */
 181                 return 0;
 182         return 1;               /* signal present               */
 183 }
 184
 185
 186 /* implement the video4linux api */
 187
 188 static int tt_do_ioctl(struct inode *inode, struct file *file,
 189                        unsigned int cmd, void *arg)
 190 {
 191         struct video_device *dev = video_devdata(file);
 192         struct tt_device *tt=dev->priv;
 193
 194         switch(cmd)
 195         {
 196                 case VIDIOCGCAP:
 197                 {
 198                         struct video_capability *v = arg;
 199                         memset(v,0,sizeof(*v));
 200                         v->type=VID_TYPE_TUNER;
 201                         v->channels=1;
 202                         v->audios=1;
 203                         strcpy(v->name, "ActiveRadio");
 204                         return 0;
 205                 }
 206                 case VIDIOCGTUNER:
 207                 {
 208                         struct video_tuner *v = arg;
 209                         if(v->tuner)    /* Only 1 tuner */
 210                                 return -EINVAL;
 211                         v->rangelow=(87*16000);
 212                         v->rangehigh=(108*16000);
 213                         v->flags=VIDEO_TUNER_LOW;
 214                         v->mode=VIDEO_MODE_AUTO;
 215                         strcpy(v->name, "FM");
 216                         v->signal=0xFFFF*tt_getsigstr(tt);
 217                         return 0;
 218                 }
 219                 case VIDIOCSTUNER:
 220                 {
 221                         struct video_tuner *v = arg;
 222                         if(v->tuner!=0)
 223                                 return -EINVAL;
 224                         /* Only 1 tuner so no setting needed ! */
 225                         return 0;
 226                 }
 227                 case VIDIOCGFREQ:
 228                 {
 229                         unsigned long *freq = arg;
 230                         *freq = tt->curfreq;
 231                         return 0;
 232                 }
 233                 case VIDIOCSFREQ:
 234                 {
 235                         unsigned long *freq = arg;
 236                         tt->curfreq = *freq;
 237                         tt_setfreq(tt, tt->curfreq);
 238                         return 0;
 239                 }
 240                 case VIDIOCGAUDIO:
 241                 {
 242                         struct video_audio *v = arg;
 243                         memset(v,0, sizeof(*v));
 244                         v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
 245                         v->volume=tt->curvol * 6554;
 246                         v->step=6554;
 247                         strcpy(v->name, "Radio");
 248                         return 0;
 249                 }
 250                 case VIDIOCSAUDIO:
 251                 {
 252                         struct video_audio *v = arg;
 253                         if(v->audio)
 254                                 return -EINVAL;
 255                         if(v->flags&VIDEO_AUDIO_MUTE)
 256                                 tt_mute(tt);
 257                         else
 258                                 tt_setvol(tt,v->volume/6554);
 259                         return 0;
 260                 }
 261                 default:
 262                         return -ENOIOCTLCMD;
 263         }
 264 }
 265
 266 static int tt_ioctl(struct inode *inode, struct file *file,
 267                     unsigned int cmd, unsigned long arg)
 268 {
 269         return video_usercopy(inode, file, cmd, arg, tt_do_ioctl);
 270 }
 271
 272 static struct tt_device terratec_unit;
 273
 274 static struct file_operations terratec_fops = {
 275         .owner          = THIS_MODULE,
 276         .open           = video_exclusive_open,
 277         .release        = video_exclusive_release,
 278         .ioctl          = tt_ioctl,
 279         .llseek         = no_llseek,
 280 };
 281
 282 static struct video_device terratec_radio=
 283 {
 284         .owner          = THIS_MODULE,
 285         .name           = "TerraTec ActiveRadio",
 286         .type           = VID_TYPE_TUNER,
 287         .hardware       = VID_HARDWARE_TERRATEC,
 288         .fops           = &terratec_fops,
 289 };
 290
 291 static int __init terratec_init(void)
 292 {
 293         if(io==-1)
 294         {
 295                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 296                 return -EINVAL;
 297         }
 298         if (!request_region(io, 2, "terratec"))
 299         {
 300                 printk(KERN_ERR "TerraTec: port 0x%x already in use\n", io);
 301                 return -EBUSY;
 302         }
 303
 304         terratec_radio.priv=&terratec_unit;
 305
 306         spin_lock_init(&lock);
 307
 308         if(video_register_device(&terratec_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 309         {
 310                 release_region(io,2);
 311                 return -EINVAL;
 312         }
 313
 314         printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver.\n");
 315
 316         /* mute card - prevents noisy bootups */
 317
 318         /* this ensures that the volume is all the way down  */
 319         cardWriteVol(0);
 320         terratec_unit.curvol = 0;
 321
 322         return 0;
 323 }
 324
 325 MODULE_AUTHOR("R.OFFERMANNS & others");
 326 MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
 327 MODULE_LICENSE("GPL");
 328 module_param(io, int, 0);
 329 MODULE_PARM_DESC(io, "I/O address of the TerraTec ActiveRadio card (0x590 or 0x591)");
 330 module_param(radio_nr, int, 0);
 331
 332 static void __exit terratec_cleanup_module(void)
 333 {
 334         video_unregister_device(&terratec_radio);
 335         release_region(io,2);
 336         printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver unloaded.\n");
 337 }
 338
 339 module_init(terratec_init);
 340 module_exit(terratec_cleanup_module);
 341