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 <media/v4l2-common.h>
  35 #include <linux/config.h>       /* CONFIG_RADIO_AZTECH_PORT     */
  36
  37 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  38
  39 #ifndef CONFIG_RADIO_AZTECH_PORT
  40 #define CONFIG_RADIO_AZTECH_PORT -1
  41 #endif
  42
  43 static int io = CONFIG_RADIO_AZTECH_PORT;
  44 static int radio_nr = -1;
  45 static int radio_wait_time = 1000;
  46 static struct mutex lock;
  47
  48 struct az_device
  49 {
  50         int curvol;
  51         unsigned long curfreq;
  52         int stereo;
  53 };
  54
  55 static int volconvert(int level)
  56 {
  57         level>>=14;             /* Map 16bits down to 2 bit */
  58         level&=3;
  59
  60         /* convert to card-friendly values */
  61         switch (level)
  62         {
  63                 case 0:
  64                         return 0;
  65                 case 1:
  66                         return 1;
  67                 case 2:
  68                         return 4;
  69                 case 3:
  70                         return 5;
  71         }
  72         return 0;       /* Quieten gcc */
  73 }
  74
  75 static void send_0_byte (struct az_device *dev)
  76 {
  77         udelay(radio_wait_time);
  78         outb_p(2+volconvert(dev->curvol), io);
  79         outb_p(64+2+volconvert(dev->curvol), io);
  80 }
  81
  82 static void send_1_byte (struct az_device *dev)
  83 {
  84         udelay (radio_wait_time);
  85         outb_p(128+2+volconvert(dev->curvol), io);
  86         outb_p(128+64+2+volconvert(dev->curvol), io);
  87 }
  88
  89 static int az_setvol(struct az_device *dev, int vol)
  90 {
  91         mutex_lock(&lock);
  92         outb (volconvert(vol), io);
  93         mutex_unlock(&lock);
  94         return 0;
  95 }
  96
  97 /* thanks to Michael Dwyer for giving me a dose of clues in
  98  * the signal strength department..
  99  *
 100  * This card has a stereo bit - bit 0 set = mono, not set = stereo
 101  * It also has a "signal" bit - bit 1 set = bad signal, not set = good
 102  *
 103  */
 104
 105 static int az_getsigstr(struct az_device *dev)
 106 {
 107         if (inb(io) & 2)        /* bit set = no signal present */
 108                 return 0;
 109         return 1;               /* signal present */
 110 }
 111
 112 static int az_getstereo(struct az_device *dev)
 113 {
 114         if (inb(io) & 1)        /* bit set = mono */
 115                 return 0;
 116         return 1;               /* stereo */
 117 }
 118
 119 static int az_setfreq(struct az_device *dev, unsigned long frequency)
 120 {
 121         int  i;
 122
 123         frequency += 171200;            /* Add 10.7 MHz IF              */
 124         frequency /= 800;               /* Convert to 50 kHz units      */
 125
 126         mutex_lock(&lock);
 127
 128         send_0_byte (dev);              /*  0: LSB of frequency       */
 129
 130         for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)  */
 131                 if (frequency & (1 << i))
 132                         send_1_byte (dev);
 133                 else
 134                         send_0_byte (dev);
 135
 136         send_0_byte (dev);              /* 14: test bit - always 0    */
 137         send_0_byte (dev);              /* 15: test bit - always 0    */
 138         send_0_byte (dev);              /* 16: band data 0 - always 0 */
 139         if (dev->stereo)                /* 17: stereo (1 to enable)   */
 140                 send_1_byte (dev);
 141         else
 142                 send_0_byte (dev);
 143
 144         send_1_byte (dev);              /* 18: band data 1 - unknown  */
 145         send_0_byte (dev);              /* 19: time base - always 0   */
 146         send_0_byte (dev);              /* 20: spacing (0 = 25 kHz)   */
 147         send_1_byte (dev);              /* 21: spacing (1 = 25 kHz)   */
 148         send_0_byte (dev);              /* 22: spacing (0 = 25 kHz)   */
 149         send_1_byte (dev);              /* 23: AM/FM (FM = 1, always) */
 150
 151         /* latch frequency */
 152
 153         udelay (radio_wait_time);
 154         outb_p(128+64+volconvert(dev->curvol), io);
 155
 156         mutex_unlock(&lock);
 157
 158         return 0;
 159 }
 160
 161 static int az_do_ioctl(struct inode *inode, struct file *file,
 162                        unsigned int cmd, void *arg)
 163 {
 164         struct video_device *dev = video_devdata(file);
 165         struct az_device *az = dev->priv;
 166
 167         switch(cmd)
 168         {
 169                 case VIDIOCGCAP:
 170                 {
 171                         struct video_capability *v = arg;
 172                         memset(v,0,sizeof(*v));
 173                         v->type=VID_TYPE_TUNER;
 174                         v->channels=1;
 175                         v->audios=1;
 176                         strcpy(v->name, "Aztech Radio");
 177                         return 0;
 178                 }
 179                 case VIDIOCGTUNER:
 180                 {
 181                         struct video_tuner *v = arg;
 182                         if(v->tuner)    /* Only 1 tuner */
 183                                 return -EINVAL;
 184                         v->rangelow=(87*16000);
 185                         v->rangehigh=(108*16000);
 186                         v->flags=VIDEO_TUNER_LOW;
 187                         v->mode=VIDEO_MODE_AUTO;
 188                         v->signal=0xFFFF*az_getsigstr(az);
 189                         if(az_getstereo(az))
 190                                 v->flags|=VIDEO_TUNER_STEREO_ON;
 191                         strcpy(v->name, "FM");
 192                         return 0;
 193                 }
 194                 case VIDIOCSTUNER:
 195                 {
 196                         struct video_tuner *v = arg;
 197                         if(v->tuner!=0)
 198                                 return -EINVAL;
 199                         return 0;
 200                 }
 201                 case VIDIOCGFREQ:
 202                 {
 203                         unsigned long *freq = arg;
 204                         *freq = az->curfreq;
 205                         return 0;
 206                 }
 207                 case VIDIOCSFREQ:
 208                 {
 209                         unsigned long *freq = arg;
 210                         az->curfreq = *freq;
 211                         az_setfreq(az, az->curfreq);
 212                         return 0;
 213                 }
 214                 case VIDIOCGAUDIO:
 215                 {
 216                         struct video_audio *v = arg;
 217                         memset(v,0, sizeof(*v));
 218                         v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
 219                         if(az->stereo)
 220                                 v->mode=VIDEO_SOUND_STEREO;
 221                         else
 222                                 v->mode=VIDEO_SOUND_MONO;
 223                         v->volume=az->curvol;
 224                         v->step=16384;
 225                         strcpy(v->name, "Radio");
 226                         return 0;
 227                 }
 228                 case VIDIOCSAUDIO:
 229                 {
 230                         struct video_audio *v = arg;
 231                         if(v->audio)
 232                                 return -EINVAL;
 233                         az->curvol=v->volume;
 234
 235                         az->stereo=(v->mode&VIDEO_SOUND_STEREO)?1:0;
 236                         if(v->flags&VIDEO_AUDIO_MUTE)
 237                                 az_setvol(az,0);
 238                         else
 239                                 az_setvol(az,az->curvol);
 240                         return 0;
 241                 }
 242                 default:
 243                         return -ENOIOCTLCMD;
 244         }
 245 }
 246
 247 static int az_ioctl(struct inode *inode, struct file *file,
 248                     unsigned int cmd, unsigned long arg)
 249 {
 250         return video_usercopy(inode, file, cmd, arg, az_do_ioctl);
 251 }
 252
 253 static struct az_device aztech_unit;
 254
 255 static struct file_operations aztech_fops = {
 256         .owner          = THIS_MODULE,
 257         .open           = video_exclusive_open,
 258         .release        = video_exclusive_release,
 259         .ioctl          = az_ioctl,
 260         .compat_ioctl   = v4l_compat_ioctl32,
 261         .llseek         = no_llseek,
 262 };
 263
 264 static struct video_device aztech_radio=
 265 {
 266         .owner          = THIS_MODULE,
 267         .name           = "Aztech radio",
 268         .type           = VID_TYPE_TUNER,
 269         .hardware       = VID_HARDWARE_AZTECH,
 270         .fops           = &aztech_fops,
 271 };
 272
 273 static int __init aztech_init(void)
 274 {
 275         if(io==-1)
 276         {
 277                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 278                 return -EINVAL;
 279         }
 280
 281         if (!request_region(io, 2, "aztech"))
 282         {
 283                 printk(KERN_ERR "aztech: port 0x%x already in use\n", io);
 284                 return -EBUSY;
 285         }
 286
 287         mutex_init(&lock);
 288         aztech_radio.priv=&aztech_unit;
 289
 290         if(video_register_device(&aztech_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 291         {
 292                 release_region(io,2);
 293                 return -EINVAL;
 294         }
 295
 296         printk(KERN_INFO "Aztech radio card driver v1.00/19990224 rkroll@exploits.org\n");
 297         /* mute card - prevents noisy bootups */
 298         outb (0, io);
 299         return 0;
 300 }
 301
 302 MODULE_AUTHOR("Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 303 MODULE_DESCRIPTION("A driver for the Aztech radio card.");
 304 MODULE_LICENSE("GPL");
 305
 306 module_param(io, int, 0);
 307 module_param(radio_nr, int, 0);
 308 MODULE_PARM_DESC(io, "I/O address of the Aztech card (0x350 or 0x358)");
 309
 310 static void __exit aztech_cleanup(void)
 311 {
 312         video_unregister_device(&aztech_radio);
 313         release_region(io,2);
 314 }
 315
 316 module_init(aztech_init);
 317 module_exit(aztech_cleanup);