drivers/media/radio/radio-aztech.c

   1 /* radio-aztech.c - Aztech radio card driver for Linux 2.2
   2  *
   3  * Adapted to support the Video for Linux API by
   4  * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
   5  *
   6  * Quay Ly
   7  * Donald Song
   8  * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
   9  * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
  10  * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
  11  *
  12  * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
  13  * along with more information on the card itself.
  14  *
  15  * History:
  16  * 1999-02-24   Russell Kroll <rkroll@exploits.org>
  17  *              Fine tuning/VIDEO_TUNER_LOW
  18  *              Range expanded to 87-108 MHz (from 87.9-107.8)
  19  *
  20  * Notable changes from the original source:
  21  * - includes stripped down to the essentials
  22  * - for loops used as delays replaced with udelay()
  23  * - #defines removed, changed to static values
  24  * - tuning structure changed - no more character arrays, other changes
  25 */
  26
  27 #include <linux/module.h>       /* Modules                      */
  28 #include <linux/init.h>         /* Initdata                     */
  29 #include <linux/ioport.h>       /* request_region               */
  30 #include <linux/delay.h>        /* udelay                       */
  31 #include <asm/io.h>             /* outb, outb_p                 */
  32 #include <asm/uaccess.h>        /* copy to/from user            */
  33 #include <linux/videodev.h>     /* kernel radio structs         */
  34 #include <linux/config.h>       /* CONFIG_RADIO_AZTECH_PORT     */
  35
  36 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  37
  38 #ifndef CONFIG_RADIO_AZTECH_PORT
  39 #define CONFIG_RADIO_AZTECH_PORT -1
  40 #endif
  41
  42 static int io = CONFIG_RADIO_AZTECH_PORT;
  43 static int radio_nr = -1;
  44 static int radio_wait_time = 1000;
  45 static struct semaphore lock;
  46
  47 struct az_device
  48 {
  49         int curvol;
  50         unsigned long curfreq;
  51         int stereo;
  52 };
  53
  54 static int volconvert(int level)
  55 {
  56         level>>=14;             /* Map 16bits down to 2 bit */
  57         level&=3;
  58
  59         /* convert to card-friendly values */
  60         switch (level)
  61         {
  62                 case 0:
  63                         return 0;
  64                 case 1:
  65                         return 1;
  66                 case 2:
  67                         return 4;
  68                 case 3:
  69                         return 5;
  70         }
  71         return 0;       /* Quieten gcc */
  72 }
  73
  74 static void send_0_byte (struct az_device *dev)
  75 {
  76         udelay(radio_wait_time);
  77         outb_p(2+volconvert(dev->curvol), io);
  78         outb_p(64+2+volconvert(dev->curvol), io);
  79 }
  80
  81 static void send_1_byte (struct az_device *dev)
  82 {
  83         udelay (radio_wait_time);
  84         outb_p(128+2+volconvert(dev->curvol), io);
  85         outb_p(128+64+2+volconvert(dev->curvol), io);
  86 }
  87
  88 static int az_setvol(struct az_device *dev, int vol)
  89 {
  90         down(&lock);
  91         outb (volconvert(vol), io);
  92         up(&lock);
  93         return 0;
  94 }
  95
  96 /* thanks to Michael Dwyer for giving me a dose of clues in
  97  * the signal strength department..
  98  *
  99  * This card has a stereo bit - bit 0 set = mono, not set = stereo
 100  * It also has a "signal" bit - bit 1 set = bad signal, not set = good
 101  *
 102  */
 103
 104 static int az_getsigstr(struct az_device *dev)
 105 {
 106         if (inb(io) & 2)        /* bit set = no signal present */
 107                 return 0;
 108         return 1;               /* signal present */
 109 }
 110
 111 static int az_getstereo(struct az_device *dev)
 112 {
 113         if (inb(io) & 1)        /* bit set = mono */
 114                 return 0;
 115         return 1;               /* stereo */
 116 }
 117
 118 static int az_setfreq(struct az_device *dev, unsigned long frequency)
 119 {
 120         int  i;
 121
 122         frequency += 171200;            /* Add 10.7 MHz IF              */
 123         frequency /= 800;               /* Convert to 50 kHz units      */
 124
 125         down(&lock);
 126
 127         send_0_byte (dev);              /*  0: LSB of frequency       */
 128
 129         for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)  */
 130                 if (frequency & (1 << i))
 131                         send_1_byte (dev);
 132                 else
 133                         send_0_byte (dev);
 134
 135         send_0_byte (dev);              /* 14: test bit - always 0    */
 136         send_0_byte (dev);              /* 15: test bit - always 0    */
 137         send_0_byte (dev);              /* 16: band data 0 - always 0 */
 138         if (dev->stereo)                /* 17: stereo (1 to enable)   */
 139                 send_1_byte (dev);
 140         else
 141                 send_0_byte (dev);
 142
 143         send_1_byte (dev);              /* 18: band data 1 - unknown  */
 144         send_0_byte (dev);              /* 19: time base - always 0   */
 145         send_0_byte (dev);              /* 20: spacing (0 = 25 kHz)   */
 146         send_1_byte (dev);              /* 21: spacing (1 = 25 kHz)   */
 147         send_0_byte (dev);              /* 22: spacing (0 = 25 kHz)   */
 148         send_1_byte (dev);              /* 23: AM/FM (FM = 1, always) */
 149
 150         /* latch frequency */
 151
 152         udelay (radio_wait_time);
 153         outb_p(128+64+volconvert(dev->curvol), io);
 154
 155         up(&lock);
 156
 157         return 0;
 158 }
 159
 160 static int az_do_ioctl(struct inode *inode, struct file *file,
 161                        unsigned int cmd, void *arg)
 162 {
 163         struct video_device *dev = video_devdata(file);
 164         struct az_device *az = dev->priv;
 165
 166         switch(cmd)
 167         {
 168                 case VIDIOCGCAP:
 169                 {
 170                         struct video_capability *v = arg;
 171                         memset(v,0,sizeof(*v));
 172                         v->type=VID_TYPE_TUNER;
 173                         v->channels=1;
 174                         v->audios=1;
 175                         strcpy(v->name, "Aztech Radio");
 176                         return 0;
 177                 }
 178                 case VIDIOCGTUNER:
 179                 {
 180                         struct video_tuner *v = arg;
 181                         if(v->tuner)    /* Only 1 tuner */
 182                                 return -EINVAL;
 183                         v->rangelow=(87*16000);
 184                         v->rangehigh=(108*16000);
 185                         v->flags=VIDEO_TUNER_LOW;
 186                         v->mode=VIDEO_MODE_AUTO;
 187                         v->signal=0xFFFF*az_getsigstr(az);
 188                         if(az_getstereo(az))
 189                                 v->flags|=VIDEO_TUNER_STEREO_ON;
 190                         strcpy(v->name, "FM");
 191                         return 0;
 192                 }
 193                 case VIDIOCSTUNER:
 194                 {
 195                         struct video_tuner *v = arg;
 196                         if(v->tuner!=0)
 197                                 return -EINVAL;
 198                         return 0;
 199                 }
 200                 case VIDIOCGFREQ:
 201                 {
 202                         unsigned long *freq = arg;
 203                         *freq = az->curfreq;
 204                         return 0;
 205                 }
 206                 case VIDIOCSFREQ:
 207                 {
 208                         unsigned long *freq = arg;
 209                         az->curfreq = *freq;
 210                         az_setfreq(az, az->curfreq);
 211                         return 0;
 212                 }
 213                 case VIDIOCGAUDIO:
 214                 {
 215                         struct video_audio *v = arg;
 216                         memset(v,0, sizeof(*v));
 217                         v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
 218                         if(az->stereo)
 219                                 v->mode=VIDEO_SOUND_STEREO;
 220                         else
 221                                 v->mode=VIDEO_SOUND_MONO;
 222                         v->volume=az->curvol;
 223                         v->step=16384;
 224                         strcpy(v->name, "Radio");
 225                         return 0;
 226                 }
 227                 case VIDIOCSAUDIO:
 228                 {
 229                         struct video_audio *v = arg;
 230                         if(v->audio)
 231                                 return -EINVAL;
 232                         az->curvol=v->volume;
 233
 234                         az->stereo=(v->mode&VIDEO_SOUND_STEREO)?1:0;
 235                         if(v->flags&VIDEO_AUDIO_MUTE)
 236                                 az_setvol(az,0);
 237                         else
 238                                 az_setvol(az,az->curvol);
 239                         return 0;
 240                 }
 241                 default:
 242                         return -ENOIOCTLCMD;
 243         }
 244 }
 245
 246 static int az_ioctl(struct inode *inode, struct file *file,
 247                     unsigned int cmd, unsigned long arg)
 248 {
 249         return video_usercopy(inode, file, cmd, arg, az_do_ioctl);
 250 }
 251
 252 static struct az_device aztech_unit;
 253
 254 static struct file_operations aztech_fops = {
 255         .owner          = THIS_MODULE,
 256         .open           = video_exclusive_open,
 257         .release        = video_exclusive_release,
 258         .ioctl          = az_ioctl,
 259         .llseek         = no_llseek,
 260 };
 261
 262 static struct video_device aztech_radio=
 263 {
 264         .owner          = THIS_MODULE,
 265         .name           = "Aztech radio",
 266         .type           = VID_TYPE_TUNER,
 267         .hardware       = VID_HARDWARE_AZTECH,
 268         .fops           = &aztech_fops,
 269 };
 270
 271 static int __init aztech_init(void)
 272 {
 273         if(io==-1)
 274         {
 275                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 276                 return -EINVAL;
 277         }
 278
 279         if (!request_region(io, 2, "aztech"))
 280         {
 281                 printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
 282                 return -EBUSY;
 283         }
 284
 285         init_MUTEX(&lock);
 286         aztech_radio.priv=&aztech_unit;
 287
 288         if(video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 289         {
 290                 release_region(io,2);
 291                 return -EINVAL;
 292         }
 293
 294         printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
 295         /* mute card - prevents noisy bootups */
 296         outb (0, io);
 297         return 0;
 298 }
 299
 300 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 301 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
 302 MODULE_LICENSE("GPL");
 303
 304 module_param(io, int, 0);
 305 module_param(radio_nr, int, 0);
 306 MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
 307
 308 static void __exit aztech_cleanup(void)
 309 {
 310         video_unregister_device(&aztech_radio);
 311         release_region(io,2);
 312 }
 313
 314 module_init(aztech_init);
 315 module_exit(aztech_cleanup);