drivers/media/radio/radio-aimslab.c

   1 /* radiotrack (radioreveal) driver for Linux radio support
   2  * (c) 1997 M. Kirkwood
   3  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
   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  * History:
   8  * 1999-02-24   Russell Kroll <rkroll@exploits.org>
   9  *              Fine tuning/VIDEO_TUNER_LOW
  10  *              Frequency range expanded to start at 87 MHz
  11  *
  12  * TODO: Allow for more than one of these foolish entities :-)
  13  *
  14  * Notes on the hardware (reverse engineered from other peoples'
  15  * reverse engineering of AIMS' code :-)
  16  *
  17  *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
  18  *
  19  *  The signal strength query is unsurprisingly inaccurate.  And it seems
  20  *  to indicate that (on my card, at least) the frequency setting isn't
  21  *  too great.  (I have to tune up .025MHz from what the freq should be
  22  *  to get a report that the thing is tuned.)
  23  *
  24  *  Volume control is (ugh) analogue:
  25  *   out(port, start_increasing_volume);
  26  *   wait(a_wee_while);
  27  *   out(port, stop_changing_the_volume);
  28  *
  29  */
  30
  31 #include <linux/module.h>       /* Modules                      */
  32 #include <linux/init.h>         /* Initdata                     */
  33 #include <linux/ioport.h>       /* request_region               */
  34 #include <linux/delay.h>        /* udelay                       */
  35 #include <asm/io.h>             /* outb, outb_p                 */
  36 #include <asm/uaccess.h>        /* copy to/from user            */
  37 #include <linux/videodev2.h>    /* kernel radio structs         */
  38 #include <media/v4l2-common.h>
  39 #include <asm/semaphore.h>      /* Lock for the I/O             */
  40
  41 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  42 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  43
  44 #ifndef CONFIG_RADIO_RTRACK_PORT
  45 #define CONFIG_RADIO_RTRACK_PORT -1
  46 #endif
  47
  48 static int io = CONFIG_RADIO_RTRACK_PORT;
  49 static int radio_nr = -1;
  50 static struct mutex lock;
  51
  52 struct rt_device
  53 {
  54         int port;
  55         int curvol;
  56         unsigned long curfreq;
  57         int muted;
  58 };
  59
  60
  61 /* local things */
  62
  63 static void sleep_delay(long n)
  64 {
  65         /* Sleep nicely for 'n' uS */
  66         int d=n/(1000000/HZ);
  67         if(!d)
  68                 udelay(n);
  69         else
  70                 msleep(jiffies_to_msecs(d));
  71 }
  72
  73 static void rt_decvol(void)
  74 {
  75         outb(0x58, io);         /* volume down + sigstr + on    */
  76         sleep_delay(100000);
  77         outb(0xd8, io);         /* volume steady + sigstr + on  */
  78 }
  79
  80 static void rt_incvol(void)
  81 {
  82         outb(0x98, io);         /* volume up + sigstr + on      */
  83         sleep_delay(100000);
  84         outb(0xd8, io);         /* volume steady + sigstr + on  */
  85 }
  86
  87 static void rt_mute(struct rt_device *dev)
  88 {
  89         dev->muted = 1;
  90         mutex_lock(&lock);
  91         outb(0xd0, io);                 /* volume steady, off           */
  92         mutex_unlock(&lock);
  93 }
  94
  95 static int rt_setvol(struct rt_device *dev, int vol)
  96 {
  97         int i;
  98
  99         mutex_lock(&lock);
 100
 101         if(vol == dev->curvol) {        /* requested volume = current */
 102                 if (dev->muted) {       /* user is unmuting the card  */
 103                         dev->muted = 0;
 104                         outb (0xd8, io);        /* enable card */
 105                 }
 106                 mutex_unlock(&lock);
 107                 return 0;
 108         }
 109
 110         if(vol == 0) {                  /* volume = 0 means mute the card */
 111                 outb(0x48, io);         /* volume down but still "on"   */
 112                 sleep_delay(2000000);   /* make sure it's totally down  */
 113                 outb(0xd0, io);         /* volume steady, off           */
 114                 dev->curvol = 0;        /* track the volume state!      */
 115                 mutex_unlock(&lock);
 116                 return 0;
 117         }
 118
 119         dev->muted = 0;
 120         if(vol > dev->curvol)
 121                 for(i = dev->curvol; i < vol; i++)
 122                         rt_incvol();
 123         else
 124                 for(i = dev->curvol; i > vol; i--)
 125                         rt_decvol();
 126
 127         dev->curvol = vol;
 128         mutex_unlock(&lock);
 129         return 0;
 130 }
 131
 132 /* the 128+64 on these outb's is to keep the volume stable while tuning
 133  * without them, the volume _will_ creep up with each frequency change
 134  * and bit 4 (+16) is to keep the signal strength meter enabled
 135  */
 136
 137 static void send_0_byte(int port, struct rt_device *dev)
 138 {
 139         if ((dev->curvol == 0) || (dev->muted)) {
 140                 outb_p(128+64+16+  1, port);   /* wr-enable + data low */
 141                 outb_p(128+64+16+2+1, port);   /* clock */
 142         }
 143         else {
 144                 outb_p(128+64+16+8+  1, port);  /* on + wr-enable + data low */
 145                 outb_p(128+64+16+8+2+1, port);  /* clock */
 146         }
 147         sleep_delay(1000);
 148 }
 149
 150 static void send_1_byte(int port, struct rt_device *dev)
 151 {
 152         if ((dev->curvol == 0) || (dev->muted)) {
 153                 outb_p(128+64+16+4  +1, port);   /* wr-enable+data high */
 154                 outb_p(128+64+16+4+2+1, port);   /* clock */
 155         }
 156         else {
 157                 outb_p(128+64+16+8+4  +1, port); /* on+wr-enable+data high */
 158                 outb_p(128+64+16+8+4+2+1, port); /* clock */
 159         }
 160
 161         sleep_delay(1000);
 162 }
 163
 164 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
 165 {
 166         int i;
 167
 168         /* adapted from radio-aztech.c */
 169
 170         /* now uses VIDEO_TUNER_LOW for fine tuning */
 171
 172         freq += 171200;                 /* Add 10.7 MHz IF              */
 173         freq /= 800;                    /* Convert to 50 kHz units      */
 174
 175         mutex_lock(&lock);                      /* Stop other ops interfering */
 176
 177         send_0_byte (io, dev);          /*  0: LSB of frequency         */
 178
 179         for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)    */
 180                 if (freq & (1 << i))
 181                         send_1_byte (io, dev);
 182                 else
 183                         send_0_byte (io, dev);
 184
 185         send_0_byte (io, dev);          /* 14: test bit - always 0    */
 186         send_0_byte (io, dev);          /* 15: test bit - always 0    */
 187
 188         send_0_byte (io, dev);          /* 16: band data 0 - always 0 */
 189         send_0_byte (io, dev);          /* 17: band data 1 - always 0 */
 190         send_0_byte (io, dev);          /* 18: band data 2 - always 0 */
 191         send_0_byte (io, dev);          /* 19: time base - always 0   */
 192
 193         send_0_byte (io, dev);          /* 20: spacing (0 = 25 kHz)   */
 194         send_1_byte (io, dev);          /* 21: spacing (1 = 25 kHz)   */
 195         send_0_byte (io, dev);          /* 22: spacing (0 = 25 kHz)   */
 196         send_1_byte (io, dev);          /* 23: AM/FM (FM = 1, always) */
 197
 198         if ((dev->curvol == 0) || (dev->muted))
 199                 outb (0xd0, io);        /* volume steady + sigstr */
 200         else
 201                 outb (0xd8, io);        /* volume steady + sigstr + on */
 202
 203         mutex_unlock(&lock);
 204
 205         return 0;
 206 }
 207
 208 static int rt_getsigstr(struct rt_device *dev)
 209 {
 210         if (inb(io) & 2)        /* bit set = no signal present  */
 211                 return 0;
 212         return 1;               /* signal present               */
 213 }
 214
 215 static struct v4l2_queryctrl radio_qctrl[] = {
 216         {
 217                 .id            = V4L2_CID_AUDIO_MUTE,
 218                 .name          = "Mute",
 219                 .minimum       = 0,
 220                 .maximum       = 1,
 221                 .default_value = 1,
 222                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 223         },{
 224                 .id            = V4L2_CID_AUDIO_VOLUME,
 225                 .name          = "Volume",
 226                 .minimum       = 0,
 227                 .maximum       = 0xff,
 228                 .step          = 1,
 229                 .default_value = 0xff,
 230                 .type          = V4L2_CTRL_TYPE_INTEGER,
 231         }
 232 };
 233
 234 static int vidioc_querycap(struct file *file, void  *priv,
 235                                         struct v4l2_capability *v)
 236 {
 237         strlcpy(v->driver, "radio-aimslab", sizeof(v->driver));
 238         strlcpy(v->card, "RadioTrack", sizeof(v->card));
 239         sprintf(v->bus_info, "ISA");
 240         v->version = RADIO_VERSION;
 241         v->capabilities = V4L2_CAP_TUNER;
 242         return 0;
 243 }
 244
 245 static int vidioc_g_tuner(struct file *file, void *priv,
 246                                         struct v4l2_tuner *v)
 247 {
 248         struct video_device *dev = video_devdata(file);
 249         struct rt_device *rt = dev->priv;
 250
 251         if (v->index > 0)
 252                 return -EINVAL;
 253
 254         strcpy(v->name, "FM");
 255         v->type = V4L2_TUNER_RADIO;
 256         v->rangelow = (87*16000);
 257         v->rangehigh = (108*16000);
 258         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 259         v->capability = V4L2_TUNER_CAP_LOW;
 260         v->audmode = V4L2_TUNER_MODE_MONO;
 261         v->signal = 0xffff*rt_getsigstr(rt);
 262         return 0;
 263 }
 264
 265 static int vidioc_s_tuner(struct file *file, void *priv,
 266                                         struct v4l2_tuner *v)
 267 {
 268         if (v->index > 0)
 269                 return -EINVAL;
 270         return 0;
 271 }
 272
 273 static int vidioc_s_frequency(struct file *file, void *priv,
 274                                         struct v4l2_frequency *f)
 275 {
 276         struct video_device *dev = video_devdata(file);
 277         struct rt_device *rt = dev->priv;
 278
 279         rt->curfreq = f->frequency;
 280         rt_setfreq(rt, rt->curfreq);
 281         return 0;
 282 }
 283
 284 static int vidioc_g_frequency(struct file *file, void *priv,
 285                                         struct v4l2_frequency *f)
 286 {
 287         struct video_device *dev = video_devdata(file);
 288         struct rt_device *rt = dev->priv;
 289
 290         f->type = V4L2_TUNER_RADIO;
 291         f->frequency = rt->curfreq;
 292         return 0;
 293 }
 294
 295 static int vidioc_queryctrl(struct file *file, void *priv,
 296                                         struct v4l2_queryctrl *qc)
 297 {
 298         int i;
 299
 300         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 301                 if (qc->id && qc->id == radio_qctrl[i].id) {
 302                         memcpy(qc, &(radio_qctrl[i]),
 303                                                 sizeof(*qc));
 304                         return 0;
 305                 }
 306         }
 307         return -EINVAL;
 308 }
 309
 310 static int vidioc_g_ctrl(struct file *file, void *priv,
 311                                         struct v4l2_control *ctrl)
 312 {
 313         struct video_device *dev = video_devdata(file);
 314         struct rt_device *rt = dev->priv;
 315
 316         switch (ctrl->id) {
 317         case V4L2_CID_AUDIO_MUTE:
 318                 ctrl->value = rt->muted;
 319                 return 0;
 320         case V4L2_CID_AUDIO_VOLUME:
 321                 ctrl->value = rt->curvol * 6554;
 322                 return 0;
 323         }
 324         return -EINVAL;
 325 }
 326
 327 static int vidioc_s_ctrl(struct file *file, void *priv,
 328                                         struct v4l2_control *ctrl)
 329 {
 330         struct video_device *dev = video_devdata(file);
 331         struct rt_device *rt = dev->priv;
 332
 333         switch (ctrl->id) {
 334         case V4L2_CID_AUDIO_MUTE:
 335                 if (ctrl->value)
 336                         rt_mute(rt);
 337                 else
 338                         rt_setvol(rt,rt->curvol);
 339                 return 0;
 340         case V4L2_CID_AUDIO_VOLUME:
 341                 rt_setvol(rt,ctrl->value);
 342                 return 0;
 343         }
 344         return -EINVAL;
 345 }
 346
 347 static int vidioc_g_audio (struct file *file, void *priv,
 348                                         struct v4l2_audio *a)
 349 {
 350         if (a->index > 1)
 351                 return -EINVAL;
 352
 353         strcpy(a->name, "Radio");
 354         a->capability = V4L2_AUDCAP_STEREO;
 355         return 0;
 356 }
 357
 358 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 359 {
 360         *i = 0;
 361         return 0;
 362 }
 363
 364 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 365 {
 366         if (i != 0)
 367                 return -EINVAL;
 368         return 0;
 369 }
 370
 371 static int vidioc_s_audio(struct file *file, void *priv,
 372                                         struct v4l2_audio *a)
 373 {
 374         if (a->index != 0)
 375                 return -EINVAL;
 376         return 0;
 377 }
 378
 379 static struct rt_device rtrack_unit;
 380
 381 static const struct file_operations rtrack_fops = {
 382         .owner          = THIS_MODULE,
 383         .open           = video_exclusive_open,
 384         .release        = video_exclusive_release,
 385         .ioctl          = video_ioctl2,
 386         .compat_ioctl   = v4l_compat_ioctl32,
 387         .llseek         = no_llseek,
 388 };
 389
 390 static struct video_device rtrack_radio=
 391 {
 392         .owner          = THIS_MODULE,
 393         .name           = "RadioTrack radio",
 394         .type           = VID_TYPE_TUNER,
 395         .fops           = &rtrack_fops,
 396         .vidioc_querycap    = vidioc_querycap,
 397         .vidioc_g_tuner     = vidioc_g_tuner,
 398         .vidioc_s_tuner     = vidioc_s_tuner,
 399         .vidioc_g_audio     = vidioc_g_audio,
 400         .vidioc_s_audio     = vidioc_s_audio,
 401         .vidioc_g_input     = vidioc_g_input,
 402         .vidioc_s_input     = vidioc_s_input,
 403         .vidioc_g_frequency = vidioc_g_frequency,
 404         .vidioc_s_frequency = vidioc_s_frequency,
 405         .vidioc_queryctrl   = vidioc_queryctrl,
 406         .vidioc_g_ctrl      = vidioc_g_ctrl,
 407         .vidioc_s_ctrl      = vidioc_s_ctrl,
 408 };
 409
 410 static int __init rtrack_init(void)
 411 {
 412         if(io==-1)
 413         {
 414                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 415                 return -EINVAL;
 416         }
 417
 418         if (!request_region(io, 2, "rtrack"))
 419         {
 420                 printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
 421                 return -EBUSY;
 422         }
 423
 424         rtrack_radio.priv=&rtrack_unit;
 425
 426         if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 427         {
 428                 release_region(io, 2);
 429                 return -EINVAL;
 430         }
 431         printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");
 432
 433         /* Set up the I/O locking */
 434
 435         mutex_init(&lock);
 436
 437         /* mute card - prevents noisy bootups */
 438
 439         /* this ensures that the volume is all the way down  */
 440         outb(0x48, io);         /* volume down but still "on"   */
 441         sleep_delay(2000000);   /* make sure it's totally down  */
 442         outb(0xc0, io);         /* steady volume, mute card     */
 443         rtrack_unit.curvol = 0;
 444
 445         return 0;
 446 }
 447
 448 MODULE_AUTHOR("M.Kirkwood");
 449 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
 450 MODULE_LICENSE("GPL");
 451
 452 module_param(io, int, 0);
 453 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
 454 module_param(radio_nr, int, 0);
 455
 456 static void __exit cleanup_rtrack_module(void)
 457 {
 458         video_unregister_device(&rtrack_radio);
 459         release_region(io,2);
 460 }
 461
 462 module_init(rtrack_init);
 463 module_exit(cleanup_rtrack_module);
 464