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 <media/v4l2-ioctl.h>
  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         unsigned long in_use;
  55         int port;
  56         int curvol;
  57         unsigned long curfreq;
  58         int muted;
  59 };
  60
  61
  62 /* local things */
  63
  64 static void sleep_delay(long n)
  65 {
  66         /* Sleep nicely for 'n' uS */
  67         int d=n/msecs_to_jiffies(1000);
  68         if(!d)
  69                 udelay(n);
  70         else
  71                 msleep(jiffies_to_msecs(d));
  72 }
  73
  74 static void rt_decvol(void)
  75 {
  76         outb(0x58, io);         /* volume down + sigstr + on    */
  77         sleep_delay(100000);
  78         outb(0xd8, io);         /* volume steady + sigstr + on  */
  79 }
  80
  81 static void rt_incvol(void)
  82 {
  83         outb(0x98, io);         /* volume up + sigstr + on      */
  84         sleep_delay(100000);
  85         outb(0xd8, io);         /* volume steady + sigstr + on  */
  86 }
  87
  88 static void rt_mute(struct rt_device *dev)
  89 {
  90         dev->muted = 1;
  91         mutex_lock(&lock);
  92         outb(0xd0, io);                 /* volume steady, off           */
  93         mutex_unlock(&lock);
  94 }
  95
  96 static int rt_setvol(struct rt_device *dev, int vol)
  97 {
  98         int i;
  99
 100         mutex_lock(&lock);
 101
 102         if(vol == dev->curvol) {        /* requested volume = current */
 103                 if (dev->muted) {       /* user is unmuting the card  */
 104                         dev->muted = 0;
 105                         outb (0xd8, io);        /* enable card */
 106                 }
 107                 mutex_unlock(&lock);
 108                 return 0;
 109         }
 110
 111         if(vol == 0) {                  /* volume = 0 means mute the card */
 112                 outb(0x48, io);         /* volume down but still "on"   */
 113                 sleep_delay(2000000);   /* make sure it's totally down  */
 114                 outb(0xd0, io);         /* volume steady, off           */
 115                 dev->curvol = 0;        /* track the volume state!      */
 116                 mutex_unlock(&lock);
 117                 return 0;
 118         }
 119
 120         dev->muted = 0;
 121         if(vol > dev->curvol)
 122                 for(i = dev->curvol; i < vol; i++)
 123                         rt_incvol();
 124         else
 125                 for(i = dev->curvol; i > vol; i--)
 126                         rt_decvol();
 127
 128         dev->curvol = vol;
 129         mutex_unlock(&lock);
 130         return 0;
 131 }
 132
 133 /* the 128+64 on these outb's is to keep the volume stable while tuning
 134  * without them, the volume _will_ creep up with each frequency change
 135  * and bit 4 (+16) is to keep the signal strength meter enabled
 136  */
 137
 138 static void send_0_byte(int port, struct rt_device *dev)
 139 {
 140         if ((dev->curvol == 0) || (dev->muted)) {
 141                 outb_p(128+64+16+  1, port);   /* wr-enable + data low */
 142                 outb_p(128+64+16+2+1, port);   /* clock */
 143         }
 144         else {
 145                 outb_p(128+64+16+8+  1, port);  /* on + wr-enable + data low */
 146                 outb_p(128+64+16+8+2+1, port);  /* clock */
 147         }
 148         sleep_delay(1000);
 149 }
 150
 151 static void send_1_byte(int port, struct rt_device *dev)
 152 {
 153         if ((dev->curvol == 0) || (dev->muted)) {
 154                 outb_p(128+64+16+4  +1, port);   /* wr-enable+data high */
 155                 outb_p(128+64+16+4+2+1, port);   /* clock */
 156         }
 157         else {
 158                 outb_p(128+64+16+8+4  +1, port); /* on+wr-enable+data high */
 159                 outb_p(128+64+16+8+4+2+1, port); /* clock */
 160         }
 161
 162         sleep_delay(1000);
 163 }
 164
 165 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
 166 {
 167         int i;
 168
 169         /* adapted from radio-aztech.c */
 170
 171         /* now uses VIDEO_TUNER_LOW for fine tuning */
 172
 173         freq += 171200;                 /* Add 10.7 MHz IF              */
 174         freq /= 800;                    /* Convert to 50 kHz units      */
 175
 176         mutex_lock(&lock);                      /* Stop other ops interfering */
 177
 178         send_0_byte (io, dev);          /*  0: LSB of frequency         */
 179
 180         for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)    */
 181                 if (freq & (1 << i))
 182                         send_1_byte (io, dev);
 183                 else
 184                         send_0_byte (io, dev);
 185
 186         send_0_byte (io, dev);          /* 14: test bit - always 0    */
 187         send_0_byte (io, dev);          /* 15: test bit - always 0    */
 188
 189         send_0_byte (io, dev);          /* 16: band data 0 - always 0 */
 190         send_0_byte (io, dev);          /* 17: band data 1 - always 0 */
 191         send_0_byte (io, dev);          /* 18: band data 2 - always 0 */
 192         send_0_byte (io, dev);          /* 19: time base - always 0   */
 193
 194         send_0_byte (io, dev);          /* 20: spacing (0 = 25 kHz)   */
 195         send_1_byte (io, dev);          /* 21: spacing (1 = 25 kHz)   */
 196         send_0_byte (io, dev);          /* 22: spacing (0 = 25 kHz)   */
 197         send_1_byte (io, dev);          /* 23: AM/FM (FM = 1, always) */
 198
 199         if ((dev->curvol == 0) || (dev->muted))
 200                 outb (0xd0, io);        /* volume steady + sigstr */
 201         else
 202                 outb (0xd8, io);        /* volume steady + sigstr + on */
 203
 204         mutex_unlock(&lock);
 205
 206         return 0;
 207 }
 208
 209 static int rt_getsigstr(struct rt_device *dev)
 210 {
 211         if (inb(io) & 2)        /* bit set = no signal present  */
 212                 return 0;
 213         return 1;               /* signal present               */
 214 }
 215
 216 static struct v4l2_queryctrl radio_qctrl[] = {
 217         {
 218                 .id            = V4L2_CID_AUDIO_MUTE,
 219                 .name          = "Mute",
 220                 .minimum       = 0,
 221                 .maximum       = 1,
 222                 .default_value = 1,
 223                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
 224         },{
 225                 .id            = V4L2_CID_AUDIO_VOLUME,
 226                 .name          = "Volume",
 227                 .minimum       = 0,
 228                 .maximum       = 0xff,
 229                 .step          = 1,
 230                 .default_value = 0xff,
 231                 .type          = V4L2_CTRL_TYPE_INTEGER,
 232         }
 233 };
 234
 235 static int vidioc_querycap(struct file *file, void  *priv,
 236                                         struct v4l2_capability *v)
 237 {
 238         strlcpy(v->driver, "radio-aimslab", sizeof(v->driver));
 239         strlcpy(v->card, "RadioTrack", sizeof(v->card));
 240         sprintf(v->bus_info, "ISA");
 241         v->version = RADIO_VERSION;
 242         v->capabilities = V4L2_CAP_TUNER;
 243         return 0;
 244 }
 245
 246 static int vidioc_g_tuner(struct file *file, void *priv,
 247                                         struct v4l2_tuner *v)
 248 {
 249         struct rt_device *rt = video_drvdata(file);
 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 rt_device *rt = video_drvdata(file);
 277
 278         rt->curfreq = f->frequency;
 279         rt_setfreq(rt, rt->curfreq);
 280         return 0;
 281 }
 282
 283 static int vidioc_g_frequency(struct file *file, void *priv,
 284                                         struct v4l2_frequency *f)
 285 {
 286         struct rt_device *rt = video_drvdata(file);
 287
 288         f->type = V4L2_TUNER_RADIO;
 289         f->frequency = rt->curfreq;
 290         return 0;
 291 }
 292
 293 static int vidioc_queryctrl(struct file *file, void *priv,
 294                                         struct v4l2_queryctrl *qc)
 295 {
 296         int i;
 297
 298         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 299                 if (qc->id && qc->id == radio_qctrl[i].id) {
 300                         memcpy(qc, &(radio_qctrl[i]),
 301                                                 sizeof(*qc));
 302                         return 0;
 303                 }
 304         }
 305         return -EINVAL;
 306 }
 307
 308 static int vidioc_g_ctrl(struct file *file, void *priv,
 309                                         struct v4l2_control *ctrl)
 310 {
 311         struct rt_device *rt = video_drvdata(file);
 312
 313         switch (ctrl->id) {
 314         case V4L2_CID_AUDIO_MUTE:
 315                 ctrl->value = rt->muted;
 316                 return 0;
 317         case V4L2_CID_AUDIO_VOLUME:
 318                 ctrl->value = rt->curvol * 6554;
 319                 return 0;
 320         }
 321         return -EINVAL;
 322 }
 323
 324 static int vidioc_s_ctrl(struct file *file, void *priv,
 325                                         struct v4l2_control *ctrl)
 326 {
 327         struct rt_device *rt = video_drvdata(file);
 328
 329         switch (ctrl->id) {
 330         case V4L2_CID_AUDIO_MUTE:
 331                 if (ctrl->value)
 332                         rt_mute(rt);
 333                 else
 334                         rt_setvol(rt,rt->curvol);
 335                 return 0;
 336         case V4L2_CID_AUDIO_VOLUME:
 337                 rt_setvol(rt,ctrl->value);
 338                 return 0;
 339         }
 340         return -EINVAL;
 341 }
 342
 343 static int vidioc_g_audio (struct file *file, void *priv,
 344                                         struct v4l2_audio *a)
 345 {
 346         if (a->index > 1)
 347                 return -EINVAL;
 348
 349         strcpy(a->name, "Radio");
 350         a->capability = V4L2_AUDCAP_STEREO;
 351         return 0;
 352 }
 353
 354 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 355 {
 356         *i = 0;
 357         return 0;
 358 }
 359
 360 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 361 {
 362         if (i != 0)
 363                 return -EINVAL;
 364         return 0;
 365 }
 366
 367 static int vidioc_s_audio(struct file *file, void *priv,
 368                                         struct v4l2_audio *a)
 369 {
 370         if (a->index != 0)
 371                 return -EINVAL;
 372         return 0;
 373 }
 374
 375 static struct rt_device rtrack_unit;
 376
 377 static int rtrack_exclusive_open(struct inode *inode, struct file *file)
 378 {
 379         return test_and_set_bit(0, &rtrack_unit.in_use) ? -EBUSY : 0;
 380 }
 381
 382 static int rtrack_exclusive_release(struct inode *inode, struct file *file)
 383 {
 384         clear_bit(0, &rtrack_unit.in_use);
 385         return 0;
 386 }
 387
 388 static const struct file_operations rtrack_fops = {
 389         .owner          = THIS_MODULE,
 390         .open           = rtrack_exclusive_open,
 391         .release        = rtrack_exclusive_release,
 392         .ioctl          = video_ioctl2,
 393 #ifdef CONFIG_COMPAT
 394         .compat_ioctl   = v4l_compat_ioctl32,
 395 #endif
 396         .llseek         = no_llseek,
 397 };
 398
 399 static const struct v4l2_ioctl_ops rtrack_ioctl_ops = {
 400         .vidioc_querycap    = vidioc_querycap,
 401         .vidioc_g_tuner     = vidioc_g_tuner,
 402         .vidioc_s_tuner     = vidioc_s_tuner,
 403         .vidioc_g_audio     = vidioc_g_audio,
 404         .vidioc_s_audio     = vidioc_s_audio,
 405         .vidioc_g_input     = vidioc_g_input,
 406         .vidioc_s_input     = vidioc_s_input,
 407         .vidioc_g_frequency = vidioc_g_frequency,
 408         .vidioc_s_frequency = vidioc_s_frequency,
 409         .vidioc_queryctrl   = vidioc_queryctrl,
 410         .vidioc_g_ctrl      = vidioc_g_ctrl,
 411         .vidioc_s_ctrl      = vidioc_s_ctrl,
 412 };
 413
 414 static struct video_device rtrack_radio = {
 415         .name           = "RadioTrack radio",
 416         .fops           = &rtrack_fops,
 417         .ioctl_ops      = &rtrack_ioctl_ops,
 418         .release        = video_device_release_empty,
 419 };
 420
 421 static int __init rtrack_init(void)
 422 {
 423         if(io==-1)
 424         {
 425                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 426                 return -EINVAL;
 427         }
 428
 429         if (!request_region(io, 2, "rtrack"))
 430         {
 431                 printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
 432                 return -EBUSY;
 433         }
 434
 435         video_set_drvdata(&rtrack_radio, &rtrack_unit);
 436
 437         if (video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 438                 release_region(io, 2);
 439                 return -EINVAL;
 440         }
 441         printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");
 442
 443         /* Set up the I/O locking */
 444
 445         mutex_init(&lock);
 446
 447         /* mute card - prevents noisy bootups */
 448
 449         /* this ensures that the volume is all the way down  */
 450         outb(0x48, io);         /* volume down but still "on"   */
 451         sleep_delay(2000000);   /* make sure it's totally down  */
 452         outb(0xc0, io);         /* steady volume, mute card     */
 453         rtrack_unit.curvol = 0;
 454
 455         return 0;
 456 }
 457
 458 MODULE_AUTHOR("M.Kirkwood");
 459 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
 460 MODULE_LICENSE("GPL");
 461
 462 module_param(io, int, 0);
 463 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
 464 module_param(radio_nr, int, 0);
 465
 466 static void __exit cleanup_rtrack_module(void)
 467 {
 468         video_unregister_device(&rtrack_radio);
 469         release_region(io,2);
 470 }
 471
 472 module_init(rtrack_init);
 473 module_exit(cleanup_rtrack_module);
 474