drivers/media/radio/radio-gemtek.c

   1 /* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
   2  *
   3  * GemTek hasn't released any specs on the card, so the protocol had to
   4  * be reverse engineered with dosemu.
   5  *
   6  * Besides the protocol changes, this is mostly a copy of:
   7  *
   8  *    RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
   9  *
  10  *    Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
  11  *    Converted to new API by Alan Cox <Alan.Cox@linux.org>
  12  *    Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
  13  *
  14  * TODO: Allow for more than one of these foolish entities :-)
  15  *
  16  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  17  */
  18
  19 #include <linux/module.h>       /* Modules                      */
  20 #include <linux/init.h>         /* Initdata                     */
  21 #include <linux/ioport.h>       /* request_region               */
  22 #include <linux/delay.h>        /* udelay                       */
  23 #include <asm/io.h>             /* outb, outb_p                 */
  24 #include <asm/uaccess.h>        /* copy to/from user            */
  25 #include <linux/videodev2.h>    /* kernel radio structs         */
  26 #include <media/v4l2-common.h>
  27 #include <linux/spinlock.h>
  28
  29 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  30 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  31
  32 static struct v4l2_queryctrl radio_qctrl[] = {
  33         {
  34                 .id            = V4L2_CID_AUDIO_MUTE,
  35                 .name          = "Mute",
  36                 .minimum       = 0,
  37                 .maximum       = 1,
  38                 .default_value = 1,
  39                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  40         },{
  41                 .id            = V4L2_CID_AUDIO_VOLUME,
  42                 .name          = "Volume",
  43                 .minimum       = 0,
  44                 .maximum       = 65535,
  45                 .step          = 65535,
  46                 .default_value = 0xff,
  47                 .type          = V4L2_CTRL_TYPE_INTEGER,
  48         }
  49 };
  50
  51 #ifndef CONFIG_RADIO_GEMTEK_PORT
  52 #define CONFIG_RADIO_GEMTEK_PORT -1
  53 #endif
  54
  55 static int io = CONFIG_RADIO_GEMTEK_PORT;
  56 static int radio_nr = -1;
  57 static spinlock_t lock;
  58
  59 struct gemtek_device
  60 {
  61         int port;
  62         unsigned long curfreq;
  63         int muted;
  64 };
  65
  66
  67 /* local things */
  68
  69 /* the correct way to mute the gemtek may be to write the last written
  70  * frequency || 0x10, but just writing 0x10 once seems to do it as well
  71  */
  72 static void gemtek_mute(struct gemtek_device *dev)
  73 {
  74         if(dev->muted)
  75                 return;
  76         spin_lock(&lock);
  77         outb(0x10, io);
  78         spin_unlock(&lock);
  79         dev->muted = 1;
  80 }
  81
  82 static void gemtek_unmute(struct gemtek_device *dev)
  83 {
  84         if(dev->muted == 0)
  85                 return;
  86         spin_lock(&lock);
  87         outb(0x20, io);
  88         spin_unlock(&lock);
  89         dev->muted = 0;
  90 }
  91
  92 static void zero(void)
  93 {
  94         outb_p(0x04, io);
  95         udelay(5);
  96         outb_p(0x05, io);
  97         udelay(5);
  98 }
  99
 100 static void one(void)
 101 {
 102         outb_p(0x06, io);
 103         udelay(5);
 104         outb_p(0x07, io);
 105         udelay(5);
 106 }
 107
 108 static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
 109 {
 110         int i;
 111
 112 /*        freq = 78.25*((float)freq/16000.0 + 10.52); */
 113
 114         freq /= 16;
 115         freq += 10520;
 116         freq *= 7825;
 117         freq /= 100000;
 118
 119         spin_lock(&lock);
 120
 121         /* 2 start bits */
 122         outb_p(0x03, io);
 123         udelay(5);
 124         outb_p(0x07, io);
 125         udelay(5);
 126
 127         /* 28 frequency bits (lsb first) */
 128         for (i = 0; i < 14; i++)
 129                 if (freq & (1 << i))
 130                         one();
 131                 else
 132                         zero();
 133         /* 36 unknown bits */
 134         for (i = 0; i < 11; i++)
 135                 zero();
 136         one();
 137         for (i = 0; i < 4; i++)
 138                 zero();
 139         one();
 140         zero();
 141
 142         /* 2 end bits */
 143         outb_p(0x03, io);
 144         udelay(5);
 145         outb_p(0x07, io);
 146         udelay(5);
 147
 148         spin_unlock(&lock);
 149
 150         return 0;
 151 }
 152
 153 static int gemtek_getsigstr(struct gemtek_device *dev)
 154 {
 155         spin_lock(&lock);
 156         inb(io);
 157         udelay(5);
 158         spin_unlock(&lock);
 159         if (inb(io) & 8)                /* bit set = no signal present */
 160                 return 0;
 161         return 1;               /* signal present */
 162 }
 163
 164 static int gemtek_do_ioctl(struct inode *inode, struct file *file,
 165                            unsigned int cmd, void *arg)
 166 {
 167         struct video_device *dev = video_devdata(file);
 168         struct gemtek_device *rt=dev->priv;
 169
 170         switch(cmd)
 171         {
 172                 case VIDIOC_QUERYCAP:
 173                 {
 174                         struct v4l2_capability *v = arg;
 175                         memset(v,0,sizeof(*v));
 176                         strlcpy(v->driver, "radio-gemtek", sizeof (v->driver));
 177                         strlcpy(v->card, "GemTek", sizeof (v->card));
 178                         sprintf(v->bus_info,"ISA");
 179                         v->version = RADIO_VERSION;
 180                         v->capabilities = V4L2_CAP_TUNER;
 181
 182                         return 0;
 183                 }
 184                 case VIDIOC_G_TUNER:
 185                 {
 186                         struct v4l2_tuner *v = arg;
 187
 188                         if (v->index > 0)
 189                                 return -EINVAL;
 190
 191                         memset(v,0,sizeof(*v));
 192                         strcpy(v->name, "FM");
 193                         v->type = V4L2_TUNER_RADIO;
 194
 195                         v->rangelow=(87*16000);
 196                         v->rangehigh=(108*16000);
 197                         v->rxsubchans =V4L2_TUNER_SUB_MONO;
 198                         v->capability=V4L2_TUNER_CAP_LOW;
 199                         v->audmode = V4L2_TUNER_MODE_MONO;
 200                         v->signal=0xFFFF*gemtek_getsigstr(rt);
 201
 202                         return 0;
 203                 }
 204                 case VIDIOC_S_TUNER:
 205                 {
 206                         struct v4l2_tuner *v = arg;
 207
 208                         if (v->index > 0)
 209                                 return -EINVAL;
 210
 211                         return 0;
 212                 }
 213                 case VIDIOC_S_FREQUENCY:
 214                 {
 215                         struct v4l2_frequency *f = arg;
 216
 217                         rt->curfreq = f->frequency;
 218                         /* needs to be called twice in order for getsigstr to work */
 219                         gemtek_setfreq(rt, rt->curfreq);
 220                         gemtek_setfreq(rt, rt->curfreq);
 221                         return 0;
 222                 }
 223                 case VIDIOC_G_FREQUENCY:
 224                 {
 225                         struct v4l2_frequency *f = arg;
 226
 227                         f->type = V4L2_TUNER_RADIO;
 228                         f->frequency = rt->curfreq;
 229
 230                         return 0;
 231                 }
 232                 case VIDIOC_QUERYCTRL:
 233                 {
 234                         struct v4l2_queryctrl *qc = arg;
 235                         int i;
 236
 237                         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 238                                 if (qc->id && qc->id == radio_qctrl[i].id) {
 239                                         memcpy(qc, &(radio_qctrl[i]),
 240                                                                 sizeof(*qc));
 241                                         return (0);
 242                                 }
 243                         }
 244                         return -EINVAL;
 245                 }
 246                 case VIDIOC_G_CTRL:
 247                 {
 248                         struct v4l2_control *ctrl= arg;
 249
 250                         switch (ctrl->id) {
 251                                 case V4L2_CID_AUDIO_MUTE:
 252                                         ctrl->value=rt->muted;
 253                                         return (0);
 254                                 case V4L2_CID_AUDIO_VOLUME:
 255                                         if (rt->muted)
 256                                                 ctrl->value=0;
 257                                         else
 258                                                 ctrl->value=65535;
 259                                         return (0);
 260                         }
 261                         return -EINVAL;
 262                 }
 263                 case VIDIOC_S_CTRL:
 264                 {
 265                         struct v4l2_control *ctrl= arg;
 266
 267                         switch (ctrl->id) {
 268                                 case V4L2_CID_AUDIO_MUTE:
 269                                         if (ctrl->value) {
 270                                                 gemtek_mute(rt);
 271                                         } else {
 272                                                 gemtek_unmute(rt);
 273                                         }
 274                                         return (0);
 275                                 case V4L2_CID_AUDIO_VOLUME:
 276                                         if (ctrl->value) {
 277                                                 gemtek_unmute(rt);
 278                                         } else {
 279                                                 gemtek_mute(rt);
 280                                         }
 281                                         return (0);
 282                         }
 283                         return -EINVAL;
 284                 }
 285                 default:
 286                         return v4l_compat_translate_ioctl(inode,file,cmd,arg,
 287                                                           gemtek_do_ioctl);
 288         }
 289 }
 290
 291 static int gemtek_ioctl(struct inode *inode, struct file *file,
 292                         unsigned int cmd, unsigned long arg)
 293 {
 294         return video_usercopy(inode, file, cmd, arg, gemtek_do_ioctl);
 295 }
 296
 297 static struct gemtek_device gemtek_unit;
 298
 299 static const struct file_operations gemtek_fops = {
 300         .owner          = THIS_MODULE,
 301         .open           = video_exclusive_open,
 302         .release        = video_exclusive_release,
 303         .ioctl          = gemtek_ioctl,
 304         .compat_ioctl   = v4l_compat_ioctl32,
 305         .llseek         = no_llseek,
 306 };
 307
 308 static struct video_device gemtek_radio=
 309 {
 310         .owner          = THIS_MODULE,
 311         .name           = "GemTek radio",
 312         .type           = VID_TYPE_TUNER,
 313         .hardware       = 0,
 314         .fops           = &gemtek_fops,
 315 };
 316
 317 static int __init gemtek_init(void)
 318 {
 319         if(io==-1)
 320         {
 321                 printk(KERN_ERR "You must set an I/O address with io=0x20c, io=0x30c, io=0x24c or io=0x34c (io=0x020c or io=0x248 for the combined sound/radiocard)\n");
 322                 return -EINVAL;
 323         }
 324
 325         if (!request_region(io, 4, "gemtek"))
 326         {
 327                 printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
 328                 return -EBUSY;
 329         }
 330
 331         gemtek_radio.priv=&gemtek_unit;
 332
 333         if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 334         {
 335                 release_region(io, 4);
 336                 return -EINVAL;
 337         }
 338         printk(KERN_INFO "GemTek Radio Card driver.\n");
 339
 340         spin_lock_init(&lock);
 341
 342         /* this is _maybe_ unnecessary */
 343         outb(0x01, io);
 344
 345         /* mute card - prevents noisy bootups */
 346         gemtek_unit.muted = 0;
 347         gemtek_mute(&gemtek_unit);
 348
 349         return 0;
 350 }
 351
 352 MODULE_AUTHOR("Jonas Munsin");
 353 MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
 354 MODULE_LICENSE("GPL");
 355
 356 module_param(io, int, 0);
 357 MODULE_PARM_DESC(io, "I/O address of the GemTek card (0x20c, 0x30c, 0x24c or 0x34c (0x20c or 0x248 have been reported to work for the combined sound/radiocard)).");
 358 module_param(radio_nr, int, 0);
 359
 360 static void __exit gemtek_cleanup(void)
 361 {
 362         video_unregister_device(&gemtek_radio);
 363         release_region(io,4);
 364 }
 365
 366 module_init(gemtek_init);
 367 module_exit(gemtek_cleanup);
 368
 369 /*
 370   Local variables:
 371   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"
 372   End:
 373 */