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>       /* 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 <media/v4l2-common.h>
  19 #include <linux/config.h>       /* CONFIG_RADIO_RTRACK2_PORT    */
  20 #include <linux/spinlock.h>
  21
  22 #ifndef CONFIG_RADIO_RTRACK2_PORT
  23 #define CONFIG_RADIO_RTRACK2_PORT -1
  24 #endif
  25
  26 static int io = CONFIG_RADIO_RTRACK2_PORT;
  27 static int radio_nr = -1;
  28 static spinlock_t lock;
  29
  30 struct rt_device
  31 {
  32         int port;
  33         unsigned long curfreq;
  34         int muted;
  35 };
  36
  37
  38 /* local things */
  39
  40 static void rt_mute(struct rt_device *dev)
  41 {
  42         if(dev->muted)
  43                 return;
  44         spin_lock(&lock);
  45         outb(1, io);
  46         spin_unlock(&lock);
  47         dev->muted = 1;
  48 }
  49
  50 static void rt_unmute(struct rt_device *dev)
  51 {
  52         if(dev->muted == 0)
  53                 return;
  54         spin_lock(&lock);
  55         outb(0, io);
  56         spin_unlock(&lock);
  57         dev->muted = 0;
  58 }
  59
  60 static void zero(void)
  61 {
  62         outb_p(1, io);
  63         outb_p(3, io);
  64         outb_p(1, io);
  65 }
  66
  67 static void one(void)
  68 {
  69         outb_p(5, io);
  70         outb_p(7, io);
  71         outb_p(5, io);
  72 }
  73
  74 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
  75 {
  76         int i;
  77
  78         freq = freq / 200 + 856;
  79
  80         spin_lock(&lock);
  81
  82         outb_p(0xc8, io);
  83         outb_p(0xc9, io);
  84         outb_p(0xc9, io);
  85
  86         for (i = 0; i < 10; i++)
  87                 zero ();
  88
  89         for (i = 14; i >= 0; i--)
  90                 if (freq & (1 << i))
  91                         one ();
  92                 else
  93                         zero ();
  94
  95         outb_p(0xc8, io);
  96         if (!dev->muted)
  97                 outb_p(0, io);
  98
  99         spin_unlock(&lock);
 100         return 0;
 101 }
 102
 103 static int rt_getsigstr(struct rt_device *dev)
 104 {
 105         if (inb(io) & 2)        /* bit set = no signal present  */
 106                 return 0;
 107         return 1;               /* signal present               */
 108 }
 109
 110 static int rt_do_ioctl(struct inode *inode, struct file *file,
 111                        unsigned int cmd, void *arg)
 112 {
 113         struct video_device *dev = video_devdata(file);
 114         struct rt_device *rt=dev->priv;
 115
 116         switch(cmd)
 117         {
 118                 case VIDIOCGCAP:
 119                 {
 120                         struct video_capability *v = arg;
 121                         memset(v,0,sizeof(*v));
 122                         v->type=VID_TYPE_TUNER;
 123                         v->channels=1;
 124                         v->audios=1;
 125                         strcpy(v->name, "RadioTrack II");
 126                         return 0;
 127                 }
 128                 case VIDIOCGTUNER:
 129                 {
 130                         struct video_tuner *v = arg;
 131                         if(v->tuner)    /* Only 1 tuner */
 132                                 return -EINVAL;
 133                         v->rangelow=88*16000;
 134                         v->rangehigh=108*16000;
 135                         v->flags=VIDEO_TUNER_LOW;
 136                         v->mode=VIDEO_MODE_AUTO;
 137                         v->signal=0xFFFF*rt_getsigstr(rt);
 138                         strcpy(v->name, "FM");
 139                         return 0;
 140                 }
 141                 case VIDIOCSTUNER:
 142                 {
 143                         struct video_tuner *v = arg;
 144                         if(v->tuner!=0)
 145                                 return -EINVAL;
 146                         /* Only 1 tuner so no setting needed ! */
 147                         return 0;
 148                 }
 149                 case VIDIOCGFREQ:
 150                 {
 151                         unsigned long *freq = arg;
 152                         *freq = rt->curfreq;
 153                         return 0;
 154                 }
 155                 case VIDIOCSFREQ:
 156                 {
 157                         unsigned long *freq = arg;
 158                         rt->curfreq = *freq;
 159                         rt_setfreq(rt, rt->curfreq);
 160                         return 0;
 161                 }
 162                 case VIDIOCGAUDIO:
 163                 {
 164                         struct video_audio *v = arg;
 165                         memset(v,0, sizeof(*v));
 166                         v->flags|=VIDEO_AUDIO_MUTABLE;
 167                         v->volume=1;
 168                         v->step=65535;
 169                         strcpy(v->name, "Radio");
 170                         return 0;
 171                 }
 172                 case VIDIOCSAUDIO:
 173                 {
 174                         struct video_audio *v = arg;
 175                         if(v->audio)
 176                                 return -EINVAL;
 177
 178                         if(v->flags&VIDEO_AUDIO_MUTE)
 179                                 rt_mute(rt);
 180                         else
 181                                 rt_unmute(rt);
 182
 183                         return 0;
 184                 }
 185                 default:
 186                         return -ENOIOCTLCMD;
 187         }
 188 }
 189
 190 static int rt_ioctl(struct inode *inode, struct file *file,
 191                     unsigned int cmd, unsigned long arg)
 192 {
 193         return video_usercopy(inode, file, cmd, arg, rt_do_ioctl);
 194 }
 195
 196 static struct rt_device rtrack2_unit;
 197
 198 static struct file_operations rtrack2_fops = {
 199         .owner          = THIS_MODULE,
 200         .open           = video_exclusive_open,
 201         .release        = video_exclusive_release,
 202         .ioctl          = rt_ioctl,
 203         .compat_ioctl   = v4l_compat_ioctl32,
 204         .llseek         = no_llseek,
 205 };
 206
 207 static struct video_device rtrack2_radio=
 208 {
 209         .owner          = THIS_MODULE,
 210         .name           = "RadioTrack II radio",
 211         .type           = VID_TYPE_TUNER,
 212         .hardware       = VID_HARDWARE_RTRACK2,
 213         .fops           = &rtrack2_fops,
 214 };
 215
 216 static int __init rtrack2_init(void)
 217 {
 218         if(io==-1)
 219         {
 220                 printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
 221                 return -EINVAL;
 222         }
 223         if (!request_region(io, 4, "rtrack2"))
 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         spin_lock_init(&lock);
 232         if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 233         {
 234                 release_region(io, 4);
 235                 return -EINVAL;
 236         }
 237
 238         printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
 239
 240         /* mute card - prevents noisy bootups */
 241         outb(1, io);
 242         rtrack2_unit.muted = 1;
 243
 244         return 0;
 245 }
 246
 247 MODULE_AUTHOR("Ben Pfaff");
 248 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
 249 MODULE_LICENSE("GPL");
 250
 251 module_param(io, int, 0);
 252 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
 253 module_param(radio_nr, int, 0);
 254
 255 static void __exit rtrack2_cleanup_module(void)
 256 {
 257         video_unregister_device(&rtrack2_radio);
 258         release_region(io,4);
 259 }
 260
 261 module_init(rtrack2_init);
 262 module_exit(rtrack2_cleanup_module);
 263
 264 /*
 265   Local variables:
 266   compile-command: "mmake"
 267   End:
 268 */