drivers/char/radio-rtrack2.c

   1 /* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
   2  *
   3  * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
   4  * Coverted to new API by Alan Cox <Alan.Cox@linux.org>
   5  * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
   6  *
   7  * TODO: Allow for more than one of these foolish entities :-)
   8  *
   9  */
  10
  11 #include <linux/module.h>       /* Modules                      */
  12 #include <linux/init.h>         /* Initdata                     */
  13 #include <linux/ioport.h>       /* check_region, request_region */
  14 #include <linux/delay.h>        /* udelay                       */
  15 #include <asm/io.h>             /* outb, outb_p                 */
  16 #include <asm/uaccess.h>        /* copy to/from user            */
  17 #include <linux/videodev.h>     /* kernel radio structs         */
  18 #include <linux/config.h>       /* CONFIG_RADIO_RTRACK2_PORT    */
  19
  20 #ifndef CONFIG_RADIO_RTRACK2_PORT
  21 #define CONFIG_RADIO_RTRACK2_PORT -1
  22 #endif
  23
  24 static int io = CONFIG_RADIO_RTRACK2_PORT;
  25 static int users = 0;
  26
  27 struct rt_device
  28 {
  29         int port;
  30         unsigned long curfreq;
  31         int muted;
  32 };
  33
  34
  35 /* local things */
  36
  37 static void rt_mute(struct rt_device *dev)
  38 {
  39         if(dev->muted)
  40                 return;
  41         outb(1, io);
  42         dev->muted = 1;
  43 }
  44
  45 static void rt_unmute(struct rt_device *dev)
  46 {
  47         if(dev->muted == 0)
  48                 return;
  49         outb(0, io);
  50         dev->muted = 0;
  51 }
  52
  53 static void zero(void)
  54 {
  55         outb_p(1, io);
  56         outb_p(3, io);
  57         outb_p(1, io);
  58 }
  59
  60 static void one(void)
  61 {
  62         outb_p(5, io);
  63         outb_p(7, io);
  64         outb_p(5, io);
  65 }
  66
  67 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
  68 {
  69         int i;
  70
  71         freq = freq / 200 + 856;
  72
  73         outb_p(0xc8, io);
  74         outb_p(0xc9, io);
  75         outb_p(0xc9, io);
  76
  77         for (i = 0; i < 10; i++)
  78                 zero ();
  79
  80         for (i = 14; i >= 0; i--)
  81                 if (freq & (1 << i))
  82                         one ();
  83                 else
  84                         zero ();
  85
  86         outb_p(0xc8, io);
  87         if (!dev->muted)
  88           outb_p(0, io);
  89         return 0;
  90 }
  91
  92 int rt_getsigstr(struct rt_device *dev)
  93 {
  94         if (inb(io) & 2)        /* bit set = no signal present  */
  95                 return 0;
  96         return 1;               /* signal present               */
  97 }
  98
  99 static int rt_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
 100 {
 101         struct rt_device *rt=dev->priv;
 102
 103         switch(cmd)
 104         {
 105                 case VIDIOCGCAP:
 106                 {
 107                         struct video_capability v;
 108                         v.type=VID_TYPE_TUNER;
 109                         v.channels=1;
 110                         v.audios=1;
 111                         /* No we don't do pictures */
 112                         v.maxwidth=0;
 113                         v.maxheight=0;
 114                         v.minwidth=0;
 115                         v.minheight=0;
 116                         strcpy(v.name, "RadioTrack II");
 117                         if(copy_to_user(arg,&v,sizeof(v)))
 118                                 return -EFAULT;
 119                         return 0;
 120                 }
 121                 case VIDIOCGTUNER:
 122                 {
 123                         struct video_tuner v;
 124                         if(copy_from_user(&v, arg,sizeof(v))!=0)
 125                                 return -EFAULT;
 126                         if(v.tuner)     /* Only 1 tuner */
 127                                 return -EINVAL;
 128                         v.rangelow=88*16000;
 129                         v.rangehigh=108*16000;
 130                         v.flags=VIDEO_TUNER_LOW;
 131                         v.mode=VIDEO_MODE_AUTO;
 132                         v.signal=0xFFFF*rt_getsigstr(rt);
 133                         strcpy(v.name, "FM");
 134                         if(copy_to_user(arg,&v, sizeof(v)))
 135                                 return -EFAULT;
 136                         return 0;
 137                 }
 138                 case VIDIOCSTUNER:
 139                 {
 140                         struct video_tuner v;
 141                         if(copy_from_user(&v, arg, sizeof(v)))
 142                                 return -EFAULT;
 143                         if(v.tuner!=0)
 144                                 return -EINVAL;
 145                         /* Only 1 tuner so no setting needed ! */
 146                         return 0;
 147                 }
 148                 case VIDIOCGFREQ:
 149                         if(copy_to_user(arg, &rt->curfreq, sizeof(rt->curfreq)))
 150                                 return -EFAULT;
 151                         return 0;
 152                 case VIDIOCSFREQ:
 153                         if(copy_from_user(&rt->curfreq, arg,sizeof(rt->curfreq)))
 154                                 return -EFAULT;
 155                         rt_setfreq(rt, rt->curfreq);
 156                         return 0;
 157                 case VIDIOCGAUDIO:
 158                 {
 159                         struct video_audio v;
 160                         memset(&v,0, sizeof(v));
 161                         v.flags|=VIDEO_AUDIO_MUTABLE;
 162                         v.volume=1;
 163                         v.step=65535;
 164                         strcpy(v.name, "Radio");
 165                         if(copy_to_user(arg,&v, sizeof(v)))
 166                                 return -EFAULT;
 167                         return 0;
 168                 }
 169                 case VIDIOCSAUDIO:
 170                 {
 171                         struct video_audio v;
 172                         if(copy_from_user(&v, arg, sizeof(v)))
 173                                 return -EFAULT;
 174                         if(v.audio)
 175                                 return -EINVAL;
 176
 177                         if(v.flags&VIDEO_AUDIO_MUTE)
 178                                 rt_mute(rt);
 179                         else
 180                                 rt_unmute(rt);
 181
 182                         return 0;
 183                 }
 184                 default:
 185                         return -ENOIOCTLCMD;
 186         }
 187 }
 188
 189 static int rt_open(struct video_device *dev, int flags)
 190 {
 191         if(users)
 192                 return -EBUSY;
 193         users++;
 194         MOD_INC_USE_COUNT;
 195         return 0;
 196 }
 197
 198 static void rt_close(struct video_device *dev)
 199 {
 200         users--;
 201         MOD_DEC_USE_COUNT;
 202 }
 203
 204 static struct rt_device rtrack2_unit;
 205
 206 static struct video_device rtrack2_radio=
 207 {
 208         "RadioTrack II radio",
 209         VID_TYPE_TUNER,
 210         VID_HARDWARE_RTRACK2,
 211         rt_open,
 212         rt_close,
 213         NULL,   /* Can't read  (no capture ability) */
 214         NULL,   /* Can't write */
 215         NULL,   /* Can't poll */
 216         rt_ioctl,
 217         NULL,
 218         NULL
 219 };
 220
 221 __initfunc(int rtrack2_init(struct video_init *v))
 222 {
 223         if (check_region(io, 4))
 224         {
 225                 printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
 226                 return -EBUSY;
 227         }
 228
 229         rtrack2_radio.priv=&rtrack2_unit;
 230
 231         if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO)==-1)
 232                 return -EINVAL;
 233
 234         request_region(io, 4, "rtrack2");
 235         printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
 236
 237         /* mute card - prevents noisy bootups */
 238         outb(1, io);
 239         rtrack2_unit.muted = 1;
 240
 241         return 0;
 242 }
 243
 244 #ifdef MODULE
 245
 246 MODULE_AUTHOR("Ben Pfaff");
 247 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
 248 MODULE_PARM(io, "i");
 249 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
 250
 251 EXPORT_NO_SYMBOLS;
 252
 253 int init_module(void)
 254 {
 255         if(io==-1)
 256         {
 257                 printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
 258                 return -EINVAL;
 259         }
 260         return rtrack2_init(NULL);
 261 }
 262
 263 void cleanup_module(void)
 264 {
 265         video_unregister_device(&rtrack2_radio);
 266         release_region(io,4);
 267 }
 268
 269 #endif
 270
 271 /*
 272   Local variables:
 273   compile-command: "gcc -c -DMODVERSIONS -D__KERNEL__ -DMODULE -O6 -Wall -Wstrict-prototypes -I /home/blp/tmp/linux-2.1.111-rtrack/include radio-rtrack2.c"
 274   End:
 275 */