LXR linux-old/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
  52static int io = CONFIG_RADIO_TERRATEC_PORT; 
  53static int radio_nr = -1;
  54static int users = 0;
  55static spinlock_t lock;
  56
  57struct tt_device
  58{
  59        int port;
  60        int curvol;
  61        unsigned long curfreq;
  62        int muted;
  63};
  64
  65
  66/* local things */
  67
  68static void cardWriteVol(int volume)
  69{
  70        int i;
  71        volume = volume+(volume * 32); // change both channels
  72        spin_lock(&lock);
  73        for (i=0;i<8;i++)
  74        {
  75                if (volume & (0x80>>i))
  76                        outb(0x80, VOLPORT);
  77                else outb(0x00, VOLPORT);
  78        }
  79        spin_unlock(&lock);
  80}
  81
  82
  83
  84static void tt_mute(struct tt_device *dev)
  85{
  86        dev->muted = 1;
  87        cardWriteVol(0);
  88}
  89
  90static int tt_setvol(struct tt_device *dev, int vol)
  91{
  92        
  93//      printk(KERN_ERR "setvol called, vol = %d\n", vol);
  94
  95        if(vol == dev->curvol) {        /* requested volume = current */
  96                if (dev->muted) {       /* user is unmuting the card  */
  97                        dev->muted = 0;
  98                        cardWriteVol(vol);      /* enable card */
  99                }       
 100        
 101                return 0;
 102        }
 103
 104        if(vol == 0) {                  /* volume = 0 means mute the card */
 105                cardWriteVol(0);        /* "turn off card" by setting vol to 0 */
 106                dev->curvol = vol;      /* track the volume state!      */
 107                return 0;
 108        }
 109
 110        dev->muted = 0;
 111        
 112        cardWriteVol(vol);
 113         
 114        dev->curvol = vol;
 115
 116        return 0;
 117
 118}
 119
 120
 121/* this is the worst part in this driver */
 122/* many more or less strange things are going on here, but hey, it works :) */
 123
 124static int tt_setfreq(struct tt_device *dev, unsigned long freq1)
 125{       
 126        int freq;
 127        int i;
 128        int p;
 129        int  temp;
 130        long rest;
 131     
 132        unsigned char buffer[25];               /* we have to bit shift 25 registers */
 133        freq = freq1/160;                       /* convert the freq. to a nice to handel value */
 134        for(i=24;i>-1;i--)
 135                buffer[i]=0;
 136
 137        rest = freq*10+10700;           /* i once had understood what is going on here */
 138                                        /* maybe some wise guy (friedhelm?) can comment this stuff */
 139        i=13;
 140        p=10;
 141        temp=102400;
 142        while (rest!=0)
 143        {
 144                if (rest%temp  == rest)
 145                        buffer[i] = 0;
 146                else 
 147                {
 148                        buffer[i] = 1; 
 149                        rest = rest-temp;
 150                }
 151                i--;
 152                p--;
 153                temp = temp/2;
 154       }
 155
 156        spin_lock(&lock);
 157        
 158        for (i=24;i>-1;i--)                     /* bit shift the values to the radiocard */
 159        {
 160                if (buffer[i]==1) 
 161                {
 162                        outb(WRT_EN|DATA, BASEPORT);
 163                        outb(WRT_EN|DATA|CLK_ON  , BASEPORT);
 164                        outb(WRT_EN|DATA, BASEPORT);
 165                }
 166                else
 167                {
 168                        outb(WRT_EN|0x00, BASEPORT);
 169                        outb(WRT_EN|0x00|CLK_ON  , BASEPORT);
 170                }
 171        }
 172        outb(0x00, BASEPORT);     
 173        
 174        spin_unlock(&lock);
 175  
 176        return 0;
 177}
 178
 179int tt_getsigstr(struct tt_device *dev)         /* TODO */
 180{
 181        if (inb(io) & 2)        /* bit set = no signal present  */
 182                return 0;
 183        return 1;               /* signal present               */
 184}
 185
 186
 187/* implement the video4linux api */
 188
 189static int tt_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
 190{
 191        struct tt_device *tt=dev->priv;
 192        
 193        switch(cmd)
 194        {
 195                case VIDIOCGCAP:
 196                {
 197                        struct video_capability v;
 198                        v.type=VID_TYPE_TUNER;
 199                        v.channels=1;
 200                        v.audios=1;
 201                        /* No we don't do pictures */
 202                        v.maxwidth=0;
 203                        v.maxheight=0;
 204                        v.minwidth=0;
 205                        v.minheight=0;
 206                        strcpy(v.name, "ActiveRadio");
 207                        if(copy_to_user(arg,&v,sizeof(v)))
 208                                return -EFAULT;
 209                        return 0;
 210                }
 211                case VIDIOCGTUNER:
 212                {
 213                        struct video_tuner v;
 214                        if(copy_from_user(&v, arg,sizeof(v))!=0) 
 215                                return -EFAULT;
 216                        if(v.tuner)     /* Only 1 tuner */ 
 217                                return -EINVAL;
 218                        v.rangelow=(87*16000);
 219                        v.rangehigh=(108*16000);
 220                        v.flags=VIDEO_TUNER_LOW;
 221                        v.mode=VIDEO_MODE_AUTO;
 222                        strcpy(v.name, "FM");
 223                        v.signal=0xFFFF*tt_getsigstr(tt);
 224                        if(copy_to_user(arg,&v, sizeof(v)))
 225                                return -EFAULT;
 226                        return 0;
 227                }
 228                case VIDIOCSTUNER:
 229                {
 230                        struct video_tuner v;
 231                        if(copy_from_user(&v, arg, sizeof(v)))
 232                                return -EFAULT;
 233                        if(v.tuner!=0)
 234                                return -EINVAL;
 235                        /* Only 1 tuner so no setting needed ! */
 236                        return 0;
 237                }
 238                case VIDIOCGFREQ:
 239                        if(copy_to_user(arg, &tt->curfreq, sizeof(tt->curfreq)))
 240                                return -EFAULT;
 241                        return 0;
 242                case VIDIOCSFREQ:
 243                        if(copy_from_user(&tt->curfreq, arg,sizeof(tt->curfreq)))
 244                                return -EFAULT;
 245                        tt_setfreq(tt, tt->curfreq);
 246                        return 0;
 247                case VIDIOCGAUDIO:
 248                {       
 249                        struct video_audio v;
 250                        memset(&v,0, sizeof(v));
 251                        v.flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
 252                        v.volume=tt->curvol * 6554;
 253                        v.step=6554;
 254                        strcpy(v.name, "Radio");
 255                        if(copy_to_user(arg,&v, sizeof(v)))
 256                                return -EFAULT;
 257                        return 0;                       
 258                }
 259                case VIDIOCSAUDIO:
 260                {
 261                        struct video_audio v;
 262                        if(copy_from_user(&v, arg, sizeof(v))) 
 263                                return -EFAULT; 
 264                        if(v.audio) 
 265                                return -EINVAL;
 266
 267                        if(v.flags&VIDEO_AUDIO_MUTE) 
 268                                tt_mute(tt);
 269                        else
 270                                tt_setvol(tt,v.volume/6554);    
 271
 272                        return 0;
 273                }
 274                default:
 275                        return -ENOIOCTLCMD;
 276        }
 277}
 278
 279static int tt_open(struct video_device *dev, int flags)
 280{
 281        if(users)
 282                return -EBUSY;
 283        users++;
 284        return 0;
 285}
 286
 287static void tt_close(struct video_device *dev)
 288{
 289        users--;
 290}
 291
 292static struct tt_device terratec_unit;
 293
 294static struct video_device terratec_radio=
 295{
 296        owner:          THIS_MODULE,
 297        name:           "TerraTec ActiveRadio",
 298        type:           VID_TYPE_TUNER,
 299        hardware:       VID_HARDWARE_TERRATEC,
 300        open:           tt_open,
 301        close:          tt_close,
 302        ioctl:          tt_ioctl,
 303};
 304
 305static int __init terratec_init(void)
 306{
 307        if(io==-1)
 308        {
 309                printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 310                return -EINVAL;
 311        }
 312        if (!request_region(io, 2, "terratec")) 
 313        {
 314                printk(KERN_ERR "TerraTec: port 0x%x already in use\n", io);
 315                return -EBUSY;
 316        }
 317
 318        terratec_radio.priv=&terratec_unit;
 319        
 320        spin_lock_init(&lock);
 321        
 322        if(video_register_device(&terratec_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 323        {
 324                release_region(io,2);
 325                return -EINVAL;
 326        }
 327                
 328        printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver.\n");
 329
 330        /* mute card - prevents noisy bootups */
 331
 332        /* this ensures that the volume is all the way down  */
 333        cardWriteVol(0);
 334        terratec_unit.curvol = 0;
 335
 336        return 0;
 337}
 338
 339MODULE_AUTHOR("R.OFFERMANNS & others");
 340MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
 341MODULE_LICENSE("GPL");
 342MODULE_PARM(io, "i");
 343MODULE_PARM_DESC(io, "I/O address of the TerraTec ActiveRadio card (0x590 or 0x591)");
 344MODULE_PARM(radio_nr, "i");
 345
 346EXPORT_NO_SYMBOLS;
 347
 348static void __exit terratec_cleanup_module(void)
 349{
 350        video_unregister_device(&terratec_radio);
 351        release_region(io,2);
 352        printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver unloaded.\n");     
 353}
 354
 355module_init(terratec_init);
 356module_exit(terratec_cleanup_module);
 357
 358