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@lxorguk.ukuu.org.uk>
   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 <linux/videodev2.h>    /* kernel radio structs         */
  36 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  37 #include <linux/io.h>           /* outb, outb_p                 */
  38 #include <media/v4l2-device.h>
  39 #include <media/v4l2-ioctl.h>
  40
  41 MODULE_AUTHOR("M.Kirkwood");
  42 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
  43 MODULE_LICENSE("GPL");
  44
  45 #ifndef CONFIG_RADIO_RTRACK_PORT
  46 #define CONFIG_RADIO_RTRACK_PORT -1
  47 #endif
  48
  49 static int io = CONFIG_RADIO_RTRACK_PORT;
  50 static int radio_nr = -1;
  51
  52 module_param(io, int, 0);
  53 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
  54 module_param(radio_nr, int, 0);
  55
  56 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
  57
  58 struct rtrack
  59 {
  60         struct v4l2_device v4l2_dev;
  61         struct video_device vdev;
  62         int port;
  63         int curvol;
  64         unsigned long curfreq;
  65         int muted;
  66         int io;
  67         struct mutex lock;
  68 };
  69
  70 static struct rtrack rtrack_card;
  71
  72 /* local things */
  73
  74 static void sleep_delay(long n)
  75 {
  76         /* Sleep nicely for 'n' uS */
  77         int d = n / msecs_to_jiffies(1000);
  78         if (!d)
  79                 udelay(n);
  80         else
  81                 msleep(jiffies_to_msecs(d));
  82 }
  83
  84 static void rt_decvol(struct rtrack *rt)
  85 {
  86         outb(0x58, rt->io);             /* volume down + sigstr + on    */
  87         sleep_delay(100000);
  88         outb(0xd8, rt->io);             /* volume steady + sigstr + on  */
  89 }
  90
  91 static void rt_incvol(struct rtrack *rt)
  92 {
  93         outb(0x98, rt->io);             /* volume up + sigstr + on      */
  94         sleep_delay(100000);
  95         outb(0xd8, rt->io);             /* volume steady + sigstr + on  */
  96 }
  97
  98 static void rt_mute(struct rtrack *rt)
  99 {
 100         rt->muted = 1;
 101         mutex_lock(&rt->lock);
 102         outb(0xd0, rt->io);             /* volume steady, off           */
 103         mutex_unlock(&rt->lock);
 104 }
 105
 106 static int rt_setvol(struct rtrack *rt, int vol)
 107 {
 108         int i;
 109
 110         mutex_lock(&rt->lock);
 111
 112         if (vol == rt->curvol) {        /* requested volume = current */
 113                 if (rt->muted) {        /* user is unmuting the card  */
 114                         rt->muted = 0;
 115                         outb(0xd8, rt->io);     /* enable card */
 116                 }
 117                 mutex_unlock(&rt->lock);
 118                 return 0;
 119         }
 120
 121         if (vol == 0) {                 /* volume = 0 means mute the card */
 122                 outb(0x48, rt->io);     /* volume down but still "on"   */
 123                 sleep_delay(2000000);   /* make sure it's totally down  */
 124                 outb(0xd0, rt->io);     /* volume steady, off           */
 125                 rt->curvol = 0;         /* track the volume state!      */
 126                 mutex_unlock(&rt->lock);
 127                 return 0;
 128         }
 129
 130         rt->muted = 0;
 131         if (vol > rt->curvol)
 132                 for (i = rt->curvol; i < vol; i++)
 133                         rt_incvol(rt);
 134         else
 135                 for (i = rt->curvol; i > vol; i--)
 136                         rt_decvol(rt);
 137
 138         rt->curvol = vol;
 139         mutex_unlock(&rt->lock);
 140         return 0;
 141 }
 142
 143 /* the 128+64 on these outb's is to keep the volume stable while tuning
 144  * without them, the volume _will_ creep up with each frequency change
 145  * and bit 4 (+16) is to keep the signal strength meter enabled
 146  */
 147
 148 static void send_0_byte(struct rtrack *rt)
 149 {
 150         if (rt->curvol == 0 || rt->muted) {
 151                 outb_p(128+64+16+  1, rt->io);   /* wr-enable + data low */
 152                 outb_p(128+64+16+2+1, rt->io);   /* clock */
 153         }
 154         else {
 155                 outb_p(128+64+16+8+  1, rt->io);  /* on + wr-enable + data low */
 156                 outb_p(128+64+16+8+2+1, rt->io);  /* clock */
 157         }
 158         sleep_delay(1000);
 159 }
 160
 161 static void send_1_byte(struct rtrack *rt)
 162 {
 163         if (rt->curvol == 0 || rt->muted) {
 164                 outb_p(128+64+16+4  +1, rt->io);   /* wr-enable+data high */
 165                 outb_p(128+64+16+4+2+1, rt->io);   /* clock */
 166         }
 167         else {
 168                 outb_p(128+64+16+8+4  +1, rt->io); /* on+wr-enable+data high */
 169                 outb_p(128+64+16+8+4+2+1, rt->io); /* clock */
 170         }
 171
 172         sleep_delay(1000);
 173 }
 174
 175 static int rt_setfreq(struct rtrack *rt, unsigned long freq)
 176 {
 177         int i;
 178
 179         mutex_lock(&rt->lock);                  /* Stop other ops interfering */
 180
 181         rt->curfreq = freq;
 182
 183         /* now uses VIDEO_TUNER_LOW for fine tuning */
 184
 185         freq += 171200;                 /* Add 10.7 MHz IF              */
 186         freq /= 800;                    /* Convert to 50 kHz units      */
 187
 188         send_0_byte(rt);                /*  0: LSB of frequency         */
 189
 190         for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)    */
 191                 if (freq & (1 << i))
 192                         send_1_byte(rt);
 193                 else
 194                         send_0_byte(rt);
 195
 196         send_0_byte(rt);                /* 14: test bit - always 0    */
 197         send_0_byte(rt);                /* 15: test bit - always 0    */
 198
 199         send_0_byte(rt);                /* 16: band data 0 - always 0 */
 200         send_0_byte(rt);                /* 17: band data 1 - always 0 */
 201         send_0_byte(rt);                /* 18: band data 2 - always 0 */
 202         send_0_byte(rt);                /* 19: time base - always 0   */
 203
 204         send_0_byte(rt);                /* 20: spacing (0 = 25 kHz)   */
 205         send_1_byte(rt);                /* 21: spacing (1 = 25 kHz)   */
 206         send_0_byte(rt);                /* 22: spacing (0 = 25 kHz)   */
 207         send_1_byte(rt);                /* 23: AM/FM (FM = 1, always) */
 208
 209         if (rt->curvol == 0 || rt->muted)
 210                 outb(0xd0, rt->io);     /* volume steady + sigstr */
 211         else
 212                 outb(0xd8, rt->io);     /* volume steady + sigstr + on */
 213
 214         mutex_unlock(&rt->lock);
 215
 216         return 0;
 217 }
 218
 219 static int rt_getsigstr(struct rtrack *rt)
 220 {
 221         int sig = 1;
 222
 223         mutex_lock(&rt->lock);
 224         if (inb(rt->io) & 2)    /* bit set = no signal present  */
 225                 sig = 0;
 226         mutex_unlock(&rt->lock);
 227         return sig;
 228 }
 229
 230 static int vidioc_querycap(struct file *file, void  *priv,
 231                                         struct v4l2_capability *v)
 232 {
 233         strlcpy(v->driver, "radio-aimslab", sizeof(v->driver));
 234         strlcpy(v->card, "RadioTrack", sizeof(v->card));
 235         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 236         v->version = RADIO_VERSION;
 237         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 238         return 0;
 239 }
 240
 241 static int vidioc_g_tuner(struct file *file, void *priv,
 242                                         struct v4l2_tuner *v)
 243 {
 244         struct rtrack *rt = video_drvdata(file);
 245
 246         if (v->index > 0)
 247                 return -EINVAL;
 248
 249         strlcpy(v->name, "FM", sizeof(v->name));
 250         v->type = V4L2_TUNER_RADIO;
 251         v->rangelow = 87 * 16000;
 252         v->rangehigh = 108 * 16000;
 253         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 254         v->capability = V4L2_TUNER_CAP_LOW;
 255         v->audmode = V4L2_TUNER_MODE_MONO;
 256         v->signal = 0xffff * rt_getsigstr(rt);
 257         return 0;
 258 }
 259
 260 static int vidioc_s_tuner(struct file *file, void *priv,
 261                                         struct v4l2_tuner *v)
 262 {
 263         return v->index ? -EINVAL : 0;
 264 }
 265
 266 static int vidioc_s_frequency(struct file *file, void *priv,
 267                                         struct v4l2_frequency *f)
 268 {
 269         struct rtrack *rt = video_drvdata(file);
 270
 271         rt_setfreq(rt, f->frequency);
 272         return 0;
 273 }
 274
 275 static int vidioc_g_frequency(struct file *file, void *priv,
 276                                         struct v4l2_frequency *f)
 277 {
 278         struct rtrack *rt = video_drvdata(file);
 279
 280         f->type = V4L2_TUNER_RADIO;
 281         f->frequency = rt->curfreq;
 282         return 0;
 283 }
 284
 285 static int vidioc_queryctrl(struct file *file, void *priv,
 286                                         struct v4l2_queryctrl *qc)
 287 {
 288         switch (qc->id) {
 289         case V4L2_CID_AUDIO_MUTE:
 290                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 291         case V4L2_CID_AUDIO_VOLUME:
 292                 return v4l2_ctrl_query_fill(qc, 0, 0xff, 1, 0xff);
 293         }
 294         return -EINVAL;
 295 }
 296
 297 static int vidioc_g_ctrl(struct file *file, void *priv,
 298                                         struct v4l2_control *ctrl)
 299 {
 300         struct rtrack *rt = video_drvdata(file);
 301
 302         switch (ctrl->id) {
 303         case V4L2_CID_AUDIO_MUTE:
 304                 ctrl->value = rt->muted;
 305                 return 0;
 306         case V4L2_CID_AUDIO_VOLUME:
 307                 ctrl->value = rt->curvol;
 308                 return 0;
 309         }
 310         return -EINVAL;
 311 }
 312
 313 static int vidioc_s_ctrl(struct file *file, void *priv,
 314                                         struct v4l2_control *ctrl)
 315 {
 316         struct rtrack *rt = video_drvdata(file);
 317
 318         switch (ctrl->id) {
 319         case V4L2_CID_AUDIO_MUTE:
 320                 if (ctrl->value)
 321                         rt_mute(rt);
 322                 else
 323                         rt_setvol(rt, rt->curvol);
 324                 return 0;
 325         case V4L2_CID_AUDIO_VOLUME:
 326                 rt_setvol(rt, ctrl->value);
 327                 return 0;
 328         }
 329         return -EINVAL;
 330 }
 331
 332 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 333 {
 334         *i = 0;
 335         return 0;
 336 }
 337
 338 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 339 {
 340         return i ? -EINVAL : 0;
 341 }
 342
 343 static int vidioc_g_audio(struct file *file, void *priv,
 344                                         struct v4l2_audio *a)
 345 {
 346         a->index = 0;
 347         strlcpy(a->name, "Radio", sizeof(a->name));
 348         a->capability = V4L2_AUDCAP_STEREO;
 349         return 0;
 350 }
 351
 352 static int vidioc_s_audio(struct file *file, void *priv,
 353                                         struct v4l2_audio *a)
 354 {
 355         return a->index ? -EINVAL : 0;
 356 }
 357
 358 static const struct v4l2_file_operations rtrack_fops = {
 359         .owner          = THIS_MODULE,
 360         .ioctl          = video_ioctl2,
 361 };
 362
 363 static const struct v4l2_ioctl_ops rtrack_ioctl_ops = {
 364         .vidioc_querycap    = vidioc_querycap,
 365         .vidioc_g_tuner     = vidioc_g_tuner,
 366         .vidioc_s_tuner     = vidioc_s_tuner,
 367         .vidioc_g_audio     = vidioc_g_audio,
 368         .vidioc_s_audio     = vidioc_s_audio,
 369         .vidioc_g_input     = vidioc_g_input,
 370         .vidioc_s_input     = vidioc_s_input,
 371         .vidioc_g_frequency = vidioc_g_frequency,
 372         .vidioc_s_frequency = vidioc_s_frequency,
 373         .vidioc_queryctrl   = vidioc_queryctrl,
 374         .vidioc_g_ctrl      = vidioc_g_ctrl,
 375         .vidioc_s_ctrl      = vidioc_s_ctrl,
 376 };
 377
 378 static int __init rtrack_init(void)
 379 {
 380         struct rtrack *rt = &rtrack_card;
 381         struct v4l2_device *v4l2_dev = &rt->v4l2_dev;
 382         int res;
 383
 384         strlcpy(v4l2_dev->name, "rtrack", sizeof(v4l2_dev->name));
 385         rt->io = io;
 386
 387         if (rt->io == -1) {
 388                 v4l2_err(v4l2_dev, "you must set an I/O address with io=0x20f or 0x30f\n");
 389                 return -EINVAL;
 390         }
 391
 392         if (!request_region(rt->io, 2, "rtrack")) {
 393                 v4l2_err(v4l2_dev, "port 0x%x already in use\n", rt->io);
 394                 return -EBUSY;
 395         }
 396
 397         res = v4l2_device_register(NULL, v4l2_dev);
 398         if (res < 0) {
 399                 release_region(rt->io, 2);
 400                 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
 401                 return res;
 402         }
 403
 404         strlcpy(rt->vdev.name, v4l2_dev->name, sizeof(rt->vdev.name));
 405         rt->vdev.v4l2_dev = v4l2_dev;
 406         rt->vdev.fops = &rtrack_fops;
 407         rt->vdev.ioctl_ops = &rtrack_ioctl_ops;
 408         rt->vdev.release = video_device_release_empty;
 409         video_set_drvdata(&rt->vdev, rt);
 410
 411         if (video_register_device(&rt->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 412                 v4l2_device_unregister(&rt->v4l2_dev);
 413                 release_region(rt->io, 2);
 414                 return -EINVAL;
 415         }
 416         v4l2_info(v4l2_dev, "AIMSlab RadioTrack/RadioReveal card driver.\n");
 417
 418         /* Set up the I/O locking */
 419
 420         mutex_init(&rt->lock);
 421
 422         /* mute card - prevents noisy bootups */
 423
 424         /* this ensures that the volume is all the way down  */
 425         outb(0x48, rt->io);             /* volume down but still "on"   */
 426         sleep_delay(2000000);   /* make sure it's totally down  */
 427         outb(0xc0, rt->io);             /* steady volume, mute card     */
 428
 429         return 0;
 430 }
 431
 432 static void __exit rtrack_exit(void)
 433 {
 434         struct rtrack *rt = &rtrack_card;
 435
 436         video_unregister_device(&rt->vdev);
 437         v4l2_device_unregister(&rt->v4l2_dev);
 438         release_region(rt->io, 2);
 439 }
 440
 441 module_init(rtrack_init);
 442 module_exit(rtrack_exit);
 443