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 vidioc_querycap(struct file *file, void  *priv,
 165                                         struct v4l2_capability *v)
 166 {
 167         strlcpy(v->driver, "radio-gemtek", sizeof(v->driver));
 168         strlcpy(v->card, "GemTek", sizeof(v->card));
 169         sprintf(v->bus_info, "ISA");
 170         v->version = RADIO_VERSION;
 171         v->capabilities = V4L2_CAP_TUNER;
 172         return 0;
 173 }
 174
 175 static int vidioc_g_tuner(struct file *file, void *priv,
 176                                         struct v4l2_tuner *v)
 177 {
 178         struct video_device *dev = video_devdata(file);
 179         struct gemtek_device *rt = dev->priv;
 180
 181         if (v->index > 0)
 182                 return -EINVAL;
 183
 184         strcpy(v->name, "FM");
 185         v->type = V4L2_TUNER_RADIO;
 186         v->rangelow = (87*16000);
 187         v->rangehigh = (108*16000);
 188         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 189         v->capability = V4L2_TUNER_CAP_LOW;
 190         v->audmode = V4L2_TUNER_MODE_MONO;
 191         v->signal = 0xffff*gemtek_getsigstr(rt);
 192         return 0;
 193 }
 194
 195 static int vidioc_s_tuner(struct file *file, void *priv,
 196                                         struct v4l2_tuner *v)
 197 {
 198         if (v->index > 0)
 199                 return -EINVAL;
 200         return 0;
 201 }
 202
 203 static int vidioc_s_frequency(struct file *file, void *priv,
 204                                         struct v4l2_frequency *f)
 205 {
 206         struct video_device *dev = video_devdata(file);
 207         struct gemtek_device *rt = dev->priv;
 208
 209         rt->curfreq = f->frequency;
 210         /* needs to be called twice in order for getsigstr to work */
 211         gemtek_setfreq(rt, rt->curfreq);
 212         gemtek_setfreq(rt, rt->curfreq);
 213         return 0;
 214 }
 215
 216 static int vidioc_g_frequency(struct file *file, void *priv,
 217                                         struct v4l2_frequency *f)
 218 {
 219         struct video_device *dev = video_devdata(file);
 220         struct gemtek_device *rt = dev->priv;
 221
 222         f->type = V4L2_TUNER_RADIO;
 223         f->frequency = rt->curfreq;
 224         return 0;
 225 }
 226
 227 static int vidioc_queryctrl(struct file *file, void *priv,
 228                                         struct v4l2_queryctrl *qc)
 229 {
 230         int i;
 231
 232         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 233                 if (qc->id && qc->id == radio_qctrl[i].id) {
 234                         memcpy(qc, &(radio_qctrl[i]),
 235                                                 sizeof(*qc));
 236                         return 0;
 237                 }
 238         }
 239         return -EINVAL;
 240 }
 241
 242 static int vidioc_g_ctrl(struct file *file, void *priv,
 243                                         struct v4l2_control *ctrl)
 244 {
 245         struct video_device *dev = video_devdata(file);
 246         struct gemtek_device *rt = dev->priv;
 247
 248         switch (ctrl->id) {
 249         case V4L2_CID_AUDIO_MUTE:
 250                 ctrl->value = rt->muted;
 251                 return 0;
 252         case V4L2_CID_AUDIO_VOLUME:
 253                 if (rt->muted)
 254                         ctrl->value = 0;
 255                 else
 256                         ctrl->value = 65535;
 257                 return 0;
 258         }
 259         return -EINVAL;
 260 }
 261
 262 static int vidioc_s_ctrl(struct file *file, void *priv,
 263                                         struct v4l2_control *ctrl)
 264 {
 265         struct video_device *dev = video_devdata(file);
 266         struct gemtek_device *rt = dev->priv;
 267
 268         switch (ctrl->id) {
 269         case V4L2_CID_AUDIO_MUTE:
 270                 if (ctrl->value)
 271                         gemtek_mute(rt);
 272                 else
 273                         gemtek_unmute(rt);
 274                 return 0;
 275         case V4L2_CID_AUDIO_VOLUME:
 276                 if (ctrl->value)
 277                         gemtek_unmute(rt);
 278                 else
 279                         gemtek_mute(rt);
 280                 return 0;
 281         }
 282         return -EINVAL;
 283 }
 284
 285 static int vidioc_g_audio (struct file *file, void *priv,
 286                                         struct v4l2_audio *a)
 287 {
 288         if (a->index > 1)
 289                 return -EINVAL;
 290
 291         strcpy(a->name, "Radio");
 292         a->capability = V4L2_AUDCAP_STEREO;
 293         return 0;
 294 }
 295
 296 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 297 {
 298         *i = 0;
 299         return 0;
 300 }
 301
 302 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 303 {
 304         if (i != 0)
 305                 return -EINVAL;
 306         return 0;
 307 }
 308
 309 static int vidioc_s_audio(struct file *file, void *priv,
 310                                         struct v4l2_audio *a)
 311 {
 312         if (a->index != 0)
 313                 return -EINVAL;
 314         return 0;
 315 }
 316
 317 static struct gemtek_device gemtek_unit;
 318
 319 static const struct file_operations gemtek_fops = {
 320         .owner          = THIS_MODULE,
 321         .open           = video_exclusive_open,
 322         .release        = video_exclusive_release,
 323         .ioctl          = video_ioctl2,
 324         .compat_ioctl   = v4l_compat_ioctl32,
 325         .llseek         = no_llseek,
 326 };
 327
 328 static struct video_device gemtek_radio=
 329 {
 330         .owner          = THIS_MODULE,
 331         .name           = "GemTek radio",
 332         .type           = VID_TYPE_TUNER,
 333         .hardware       = 0,
 334         .fops           = &gemtek_fops,
 335         .vidioc_querycap    = vidioc_querycap,
 336         .vidioc_g_tuner     = vidioc_g_tuner,
 337         .vidioc_s_tuner     = vidioc_s_tuner,
 338         .vidioc_g_audio     = vidioc_g_audio,
 339         .vidioc_s_audio     = vidioc_s_audio,
 340         .vidioc_g_input     = vidioc_g_input,
 341         .vidioc_s_input     = vidioc_s_input,
 342         .vidioc_g_frequency = vidioc_g_frequency,
 343         .vidioc_s_frequency = vidioc_s_frequency,
 344         .vidioc_queryctrl   = vidioc_queryctrl,
 345         .vidioc_g_ctrl      = vidioc_g_ctrl,
 346         .vidioc_s_ctrl      = vidioc_s_ctrl,
 347 };
 348
 349 static int __init gemtek_init(void)
 350 {
 351         if(io==-1)
 352         {
 353                 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");
 354                 return -EINVAL;
 355         }
 356
 357         if (!request_region(io, 4, "gemtek"))
 358         {
 359                 printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
 360                 return -EBUSY;
 361         }
 362
 363         gemtek_radio.priv=&gemtek_unit;
 364
 365         if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 366         {
 367                 release_region(io, 4);
 368                 return -EINVAL;
 369         }
 370         printk(KERN_INFO "GemTek Radio Card driver.\n");
 371
 372         spin_lock_init(&lock);
 373
 374         /* this is _maybe_ unnecessary */
 375         outb(0x01, io);
 376
 377         /* mute card - prevents noisy bootups */
 378         gemtek_unit.muted = 0;
 379         gemtek_mute(&gemtek_unit);
 380
 381         return 0;
 382 }
 383
 384 MODULE_AUTHOR("Jonas Munsin");
 385 MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
 386 MODULE_LICENSE("GPL");
 387
 388 module_param(io, int, 0);
 389 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)).");
 390 module_param(radio_nr, int, 0);
 391
 392 static void __exit gemtek_cleanup(void)
 393 {
 394         video_unregister_device(&gemtek_radio);
 395         release_region(io,4);
 396 }
 397
 398 module_init(gemtek_init);
 399 module_exit(gemtek_cleanup);
 400
 401 /*
 402   Local variables:
 403   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"
 404   End:
 405 */