drivers/media/radio/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 #include <linux/spinlock.h>
  20
  21 #ifndef CONFIG_RADIO_RTRACK2_PORT
  22 #define CONFIG_RADIO_RTRACK2_PORT -1
  23 #endif
  24
  25 static int io = CONFIG_RADIO_RTRACK2_PORT;
  26 static int users = 0;
  27 static spinlock_t lock;
  28
  29 struct rt_device
  30 {
  31         int port;
  32         unsigned long curfreq;
  33         int muted;
  34 };
  35
  36
  37 /* local things */
  38
  39 static void rt_mute(struct rt_device *dev)
  40 {
  41         if(dev->muted)
  42                 return;
  43         spin_lock(&lock);
  44         outb(1, io);
  45         spin_unlock(&lock);
  46         dev->muted = 1;
  47 }
  48
  49 static void rt_unmute(struct rt_device *dev)
  50 {
  51         if(dev->muted == 0)
  52                 return;
  53         spin_lock(&lock);
  54         outb(0, io);
  55         spin_unlock(&lock);
  56         dev->muted = 0;
  57 }
  58
  59 static void zero(void)
  60 {
  61         outb_p(1, io);
  62         outb_p(3, io);
  63         outb_p(1, io);
  64 }
  65
  66 static void one(void)
  67 {
  68         outb_p(5, io);
  69         outb_p(7, io);
  70         outb_p(5, io);
  71 }
  72
  73 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
  74 {
  75         int i;
  76
  77         freq = freq / 200 + 856;
  78
  79         spin_lock(&lock);
  80
  81         outb_p(0xc8, io);
  82         outb_p(0xc9, io);
  83         outb_p(0xc9, io);
  84
  85         for (i = 0; i < 10; i++)
  86                 zero ();
  87
  88         for (i = 14; i >= 0; i--)
  89                 if (freq & (1 << i))
  90                         one ();
  91                 else
  92                         zero ();
  93
  94         outb_p(0xc8, io);
  95         if (!dev->muted)
  96                 outb_p(0, io);
  97
  98         spin_unlock(&lock);
  99         return 0;
 100 }
 101
 102 static int rt_getsigstr(struct rt_device *dev)
 103 {
 104         if (inb(io) & 2)        /* bit set = no signal present  */
 105                 return 0;
 106         return 1;               /* signal present               */
 107 }
 108
 109 static int rt_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
 110 {
 111         struct rt_device *rt=dev->priv;
 112
 113         switch(cmd)
 114         {
 115                 case VIDIOCGCAP:
 116                 {
 117                         struct video_capability v;
 118                         v.type=VID_TYPE_TUNER;
 119                         v.channels=1;
 120                         v.audios=1;
 121                         /* No we don't do pictures */
 122                         v.maxwidth=0;
 123                         v.maxheight=0;
 124                         v.minwidth=0;
 125                         v.minheight=0;
 126                         strcpy(v.name, "RadioTrack II");
 127                         if(copy_to_user(arg,&v,sizeof(v)))
 128                                 return -EFAULT;
 129                         return 0;
 130                 }
 131                 case VIDIOCGTUNER:
 132                 {
 133                         struct video_tuner v;
 134                         if(copy_from_user(&v, arg,sizeof(v))!=0)
 135                                 return -EFAULT;
 136                         if(v.tuner)     /* Only 1 tuner */
 137                                 return -EINVAL;
 138                         v.rangelow=88*16000;
 139                         v.rangehigh=108*16000;
 140                         v.flags=VIDEO_TUNER_LOW;
 141                         v.mode=VIDEO_MODE_AUTO;
 142                         v.signal=0xFFFF*rt_getsigstr(rt);
 143                         strcpy(v.name, "FM");
 144                         if(copy_to_user(arg,&v, sizeof(v)))
 145                                 return -EFAULT;
 146                         return 0;
 147                 }
 148                 case VIDIOCSTUNER:
 149                 {
 150                         struct video_tuner v;
 151                         if(copy_from_user(&v, arg, sizeof(v)))
 152                                 return -EFAULT;
 153                         if(v.tuner!=0)
 154                                 return -EINVAL;
 155                         /* Only 1 tuner so no setting needed ! */
 156                         return 0;
 157                 }
 158                 case VIDIOCGFREQ:
 159                         if(copy_to_user(arg, &rt->curfreq, sizeof(rt->curfreq)))
 160                                 return -EFAULT;
 161                         return 0;
 162                 case VIDIOCSFREQ:
 163                         if(copy_from_user(&rt->curfreq, arg,sizeof(rt->curfreq)))
 164                                 return -EFAULT;
 165                         rt_setfreq(rt, rt->curfreq);
 166                         return 0;
 167                 case VIDIOCGAUDIO:
 168                 {
 169                         struct video_audio v;
 170                         memset(&v,0, sizeof(v));
 171                         v.flags|=VIDEO_AUDIO_MUTABLE;
 172                         v.volume=1;
 173                         v.step=65535;
 174                         strcpy(v.name, "Radio");
 175                         if(copy_to_user(arg,&v, sizeof(v)))
 176                                 return -EFAULT;
 177                         return 0;
 178                 }
 179                 case VIDIOCSAUDIO:
 180                 {
 181                         struct video_audio v;
 182                         if(copy_from_user(&v, arg, sizeof(v)))
 183                                 return -EFAULT;
 184                         if(v.audio)
 185                                 return -EINVAL;
 186
 187                         if(v.flags&VIDEO_AUDIO_MUTE)
 188                                 rt_mute(rt);
 189                         else
 190                                 rt_unmute(rt);
 191
 192                         return 0;
 193                 }
 194                 default:
 195                         return -ENOIOCTLCMD;
 196         }
 197 }
 198
 199 static int rt_open(struct video_device *dev, int flags)
 200 {
 201         if(users)
 202                 return -EBUSY;
 203         users++;
 204         MOD_INC_USE_COUNT;
 205         return 0;
 206 }
 207
 208 static void rt_close(struct video_device *dev)
 209 {
 210         users--;
 211         MOD_DEC_USE_COUNT;
 212 }
 213
 214 static struct rt_device rtrack2_unit;
 215
 216 static struct video_device rtrack2_radio=
 217 {
 218         name:           "RadioTrack II radio",
 219         type:           VID_TYPE_TUNER,
 220         hardware:       VID_HARDWARE_RTRACK2,
 221         open:           rt_open,
 222         close:          rt_close,
 223         ioctl:          rt_ioctl,
 224 };
 225
 226 static int __init rtrack2_init(void)
 227 {
 228         if(io==-1)
 229         {
 230                 printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
 231                 return -EINVAL;
 232         }
 233         if (request_region(io, 4, "rtrack2"))
 234         {
 235                 printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
 236                 return -EBUSY;
 237         }
 238
 239         rtrack2_radio.priv=&rtrack2_unit;
 240
 241         spin_lock_init(&lock);
 242         if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO)==-1)
 243         {
 244                 release_region(io, 4);
 245                 return -EINVAL;
 246         }
 247
 248         printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
 249
 250         /* mute card - prevents noisy bootups */
 251         outb(1, io);
 252         rtrack2_unit.muted = 1;
 253
 254         return 0;
 255 }
 256
 257 MODULE_AUTHOR("Ben Pfaff");
 258 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
 259 MODULE_PARM(io, "i");
 260 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
 261
 262 EXPORT_NO_SYMBOLS;
 263
 264 static void __exit rtrack2_cleanup_module(void)
 265 {
 266         video_unregister_device(&rtrack2_radio);
 267         release_region(io,4);
 268 }
 269
 270 module_init(rtrack2_init);
 271 module_exit(rtrack2_cleanup_module);
 272
 273 /*
 274   Local variables:
 275   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"
 276   End:
 277 */