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  * Converted 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 radio_nr = -1;
  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_do_ioctl(struct inode *inode, struct file *file,
 110                        unsigned int cmd, void *arg)
 111 {
 112         struct video_device *dev = video_devdata(file);
 113         struct rt_device *rt=dev->priv;
 114
 115         switch(cmd)
 116         {
 117                 case VIDIOCGCAP:
 118                 {
 119                         struct video_capability *v = arg;
 120                         memset(v,0,sizeof(*v));
 121                         v->type=VID_TYPE_TUNER;
 122                         v->channels=1;
 123                         v->audios=1;
 124                         strcpy(v->name, "RadioTrack II");
 125                         return 0;
 126                 }
 127                 case VIDIOCGTUNER:
 128                 {
 129                         struct video_tuner *v = arg;
 130                         if(v->tuner)    /* Only 1 tuner */
 131                                 return -EINVAL;
 132                         v->rangelow=88*16000;
 133                         v->rangehigh=108*16000;
 134                         v->flags=VIDEO_TUNER_LOW;
 135                         v->mode=VIDEO_MODE_AUTO;
 136                         v->signal=0xFFFF*rt_getsigstr(rt);
 137                         strcpy(v->name, "FM");
 138                         return 0;
 139                 }
 140                 case VIDIOCSTUNER:
 141                 {
 142                         struct video_tuner *v = arg;
 143                         if(v->tuner!=0)
 144                                 return -EINVAL;
 145                         /* Only 1 tuner so no setting needed ! */
 146                         return 0;
 147                 }
 148                 case VIDIOCGFREQ:
 149                 {
 150                         unsigned long *freq = arg;
 151                         *freq = rt->curfreq;
 152                         return 0;
 153                 }
 154                 case VIDIOCSFREQ:
 155                 {
 156                         unsigned long *freq = arg;
 157                         rt->curfreq = *freq;
 158                         rt_setfreq(rt, rt->curfreq);
 159                         return 0;
 160                 }
 161                 case VIDIOCGAUDIO:
 162                 {
 163                         struct video_audio *v = arg;
 164                         memset(v,0, sizeof(*v));
 165                         v->flags|=VIDEO_AUDIO_MUTABLE;
 166                         v->volume=1;
 167                         v->step=65535;
 168                         strcpy(v->name, "Radio");
 169                         return 0;
 170                 }
 171                 case VIDIOCSAUDIO:
 172                 {
 173                         struct video_audio *v = arg;
 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_ioctl(struct inode *inode, struct file *file,
 190                     unsigned int cmd, unsigned long arg)
 191 {
 192         return video_usercopy(inode, file, cmd, arg, rt_do_ioctl);
 193 }
 194
 195 static struct rt_device rtrack2_unit;
 196
 197 static struct file_operations rtrack2_fops = {
 198         .owner          = THIS_MODULE,
 199         .open           = video_exclusive_open,
 200         .release        = video_exclusive_release,
 201         .ioctl          = rt_ioctl,
 202         .llseek         = no_llseek,
 203 };
 204
 205 static struct video_device rtrack2_radio=
 206 {
 207         .owner          = THIS_MODULE,
 208         .name           = "RadioTrack II radio",
 209         .type           = VID_TYPE_TUNER,
 210         .hardware       = VID_HARDWARE_RTRACK2,
 211         .fops           = &rtrack2_fops,
 212 };
 213
 214 static int __init rtrack2_init(void)
 215 {
 216         if(io==-1)
 217         {
 218                 printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
 219                 return -EINVAL;
 220         }
 221         if (!request_region(io, 4, "rtrack2"))
 222         {
 223                 printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
 224                 return -EBUSY;
 225         }
 226
 227         rtrack2_radio.priv=&rtrack2_unit;
 228
 229         spin_lock_init(&lock);
 230         if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 231         {
 232                 release_region(io, 4);
 233                 return -EINVAL;
 234         }
 235
 236         printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
 237
 238         /* mute card - prevents noisy bootups */
 239         outb(1, io);
 240         rtrack2_unit.muted = 1;
 241
 242         return 0;
 243 }
 244
 245 MODULE_AUTHOR("Ben Pfaff");
 246 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
 247 MODULE_LICENSE("GPL");
 248
 249 module_param(io, int, 0);
 250 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
 251 module_param(radio_nr, int, 0);
 252
 253 static void __exit rtrack2_cleanup_module(void)
 254 {
 255         video_unregister_device(&rtrack2_radio);
 256         release_region(io,4);
 257 }
 258
 259 module_init(rtrack2_init);
 260 module_exit(rtrack2_cleanup_module);
 261
 262 /*
 263   Local variables:
 264   compile-command: "mmake"
 265   End:
 266 */