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>        /* msleep                       */
  35 #include <linux/videodev2.h>    /* kernel radio structs         */
  36 #include <linux/io.h>           /* outb, outb_p                 */
  37 #include <media/v4l2-device.h>
  38 #include <media/v4l2-ioctl.h>
  39
  40 MODULE_AUTHOR("M.Kirkwood");
  41 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
  42 MODULE_LICENSE("GPL");
  43 MODULE_VERSION("0.0.3");
  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 struct rtrack
  57 {
  58         struct v4l2_device v4l2_dev;
  59         struct video_device vdev;
  60         int port;
  61         int curvol;
  62         unsigned long curfreq;
  63         int muted;
  64         int io;
  65         struct mutex lock;
  66 };
  67
  68 static struct rtrack rtrack_card;
  69
  70 /* local things */
  71
  72 static void rt_decvol(struct rtrack *rt)
  73 {
  74         outb(0x58, rt->io);             /* volume down + sigstr + on    */
  75         msleep(100);
  76         outb(0xd8, rt->io);             /* volume steady + sigstr + on  */
  77 }
  78
  79 static void rt_incvol(struct rtrack *rt)
  80 {
  81         outb(0x98, rt->io);             /* volume up + sigstr + on      */
  82         msleep(100);
  83         outb(0xd8, rt->io);             /* volume steady + sigstr + on  */
  84 }
  85
  86 static void rt_mute(struct rtrack *rt)
  87 {
  88         rt->muted = 1;
  89         mutex_lock(&rt->lock);
  90         outb(0xd0, rt->io);             /* volume steady, off           */
  91         mutex_unlock(&rt->lock);
  92 }
  93
  94 static int rt_setvol(struct rtrack *rt, int vol)
  95 {
  96         int i;
  97
  98         mutex_lock(&rt->lock);
  99
 100         if (vol == rt->curvol) {        /* requested volume = current */
 101                 if (rt->muted) {        /* user is unmuting the card  */
 102                         rt->muted = 0;
 103                         outb(0xd8, rt->io);     /* enable card */
 104                 }
 105                 mutex_unlock(&rt->lock);
 106                 return 0;
 107         }
 108
 109         if (vol == 0) {                 /* volume = 0 means mute the card */
 110                 outb(0x48, rt->io);     /* volume down but still "on"   */
 111                 msleep(2000);   /* make sure it's totally down  */
 112                 outb(0xd0, rt->io);     /* volume steady, off           */
 113                 rt->curvol = 0;         /* track the volume state!      */
 114                 mutex_unlock(&rt->lock);
 115                 return 0;
 116         }
 117
 118         rt->muted = 0;
 119         if (vol > rt->curvol)
 120                 for (i = rt->curvol; i < vol; i++)
 121                         rt_incvol(rt);
 122         else
 123                 for (i = rt->curvol; i > vol; i--)
 124                         rt_decvol(rt);
 125
 126         rt->curvol = vol;
 127         mutex_unlock(&rt->lock);
 128         return 0;
 129 }
 130
 131 /* the 128+64 on these outb's is to keep the volume stable while tuning
 132  * without them, the volume _will_ creep up with each frequency change
 133  * and bit 4 (+16) is to keep the signal strength meter enabled
 134  */
 135
 136 static void send_0_byte(struct rtrack *rt)
 137 {
 138         if (rt->curvol == 0 || rt->muted) {
 139                 outb_p(128+64+16+  1, rt->io);   /* wr-enable + data low */
 140                 outb_p(128+64+16+2+1, rt->io);   /* clock */
 141         }
 142         else {
 143                 outb_p(128+64+16+8+  1, rt->io);  /* on + wr-enable + data low */
 144                 outb_p(128+64+16+8+2+1, rt->io);  /* clock */
 145         }
 146         msleep(1);
 147 }
 148
 149 static void send_1_byte(struct rtrack *rt)
 150 {
 151         if (rt->curvol == 0 || rt->muted) {
 152                 outb_p(128+64+16+4  +1, rt->io);   /* wr-enable+data high */
 153                 outb_p(128+64+16+4+2+1, rt->io);   /* clock */
 154         }
 155         else {
 156                 outb_p(128+64+16+8+4  +1, rt->io); /* on+wr-enable+data high */
 157                 outb_p(128+64+16+8+4+2+1, rt->io); /* clock */
 158         }
 159
 160         msleep(1);
 161 }
 162
 163 static int rt_setfreq(struct rtrack *rt, unsigned long freq)
 164 {
 165         int i;
 166
 167         mutex_lock(&rt->lock);                  /* Stop other ops interfering */
 168
 169         rt->curfreq = freq;
 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         send_0_byte(rt);                /*  0: LSB of frequency         */
 177
 178         for (i = 0; i < 13; i++)        /*   : frequency bits (1-13)    */
 179                 if (freq & (1 << i))
 180                         send_1_byte(rt);
 181                 else
 182                         send_0_byte(rt);
 183
 184         send_0_byte(rt);                /* 14: test bit - always 0    */
 185         send_0_byte(rt);                /* 15: test bit - always 0    */
 186
 187         send_0_byte(rt);                /* 16: band data 0 - always 0 */
 188         send_0_byte(rt);                /* 17: band data 1 - always 0 */
 189         send_0_byte(rt);                /* 18: band data 2 - always 0 */
 190         send_0_byte(rt);                /* 19: time base - always 0   */
 191
 192         send_0_byte(rt);                /* 20: spacing (0 = 25 kHz)   */
 193         send_1_byte(rt);                /* 21: spacing (1 = 25 kHz)   */
 194         send_0_byte(rt);                /* 22: spacing (0 = 25 kHz)   */
 195         send_1_byte(rt);                /* 23: AM/FM (FM = 1, always) */
 196
 197         if (rt->curvol == 0 || rt->muted)
 198                 outb(0xd0, rt->io);     /* volume steady + sigstr */
 199         else
 200                 outb(0xd8, rt->io);     /* volume steady + sigstr + on */
 201
 202         mutex_unlock(&rt->lock);
 203
 204         return 0;
 205 }
 206
 207 static int rt_getsigstr(struct rtrack *rt)
 208 {
 209         int sig = 1;
 210
 211         mutex_lock(&rt->lock);
 212         if (inb(rt->io) & 2)    /* bit set = no signal present  */
 213                 sig = 0;
 214         mutex_unlock(&rt->lock);
 215         return sig;
 216 }
 217
 218 static int vidioc_querycap(struct file *file, void  *priv,
 219                                         struct v4l2_capability *v)
 220 {
 221         strlcpy(v->driver, "radio-aimslab", sizeof(v->driver));
 222         strlcpy(v->card, "RadioTrack", sizeof(v->card));
 223         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 224         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 225         return 0;
 226 }
 227
 228 static int vidioc_g_tuner(struct file *file, void *priv,
 229                                         struct v4l2_tuner *v)
 230 {
 231         struct rtrack *rt = video_drvdata(file);
 232
 233         if (v->index > 0)
 234                 return -EINVAL;
 235
 236         strlcpy(v->name, "FM", sizeof(v->name));
 237         v->type = V4L2_TUNER_RADIO;
 238         v->rangelow = 87 * 16000;
 239         v->rangehigh = 108 * 16000;
 240         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 241         v->capability = V4L2_TUNER_CAP_LOW;
 242         v->audmode = V4L2_TUNER_MODE_MONO;
 243         v->signal = 0xffff * rt_getsigstr(rt);
 244         return 0;
 245 }
 246
 247 static int vidioc_s_tuner(struct file *file, void *priv,
 248                                         struct v4l2_tuner *v)
 249 {
 250         return v->index ? -EINVAL : 0;
 251 }
 252
 253 static int vidioc_s_frequency(struct file *file, void *priv,
 254                                         struct v4l2_frequency *f)
 255 {
 256         struct rtrack *rt = video_drvdata(file);
 257
 258         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 259                 return -EINVAL;
 260         rt_setfreq(rt, f->frequency);
 261         return 0;
 262 }
 263
 264 static int vidioc_g_frequency(struct file *file, void *priv,
 265                                         struct v4l2_frequency *f)
 266 {
 267         struct rtrack *rt = video_drvdata(file);
 268
 269         if (f->tuner != 0)
 270                 return -EINVAL;
 271         f->type = V4L2_TUNER_RADIO;
 272         f->frequency = rt->curfreq;
 273         return 0;
 274 }
 275
 276 static int vidioc_queryctrl(struct file *file, void *priv,
 277                                         struct v4l2_queryctrl *qc)
 278 {
 279         switch (qc->id) {
 280         case V4L2_CID_AUDIO_MUTE:
 281                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 282         case V4L2_CID_AUDIO_VOLUME:
 283                 return v4l2_ctrl_query_fill(qc, 0, 0xff, 1, 0xff);
 284         }
 285         return -EINVAL;
 286 }
 287
 288 static int vidioc_g_ctrl(struct file *file, void *priv,
 289                                         struct v4l2_control *ctrl)
 290 {
 291         struct rtrack *rt = video_drvdata(file);
 292
 293         switch (ctrl->id) {
 294         case V4L2_CID_AUDIO_MUTE:
 295                 ctrl->value = rt->muted;
 296                 return 0;
 297         case V4L2_CID_AUDIO_VOLUME:
 298                 ctrl->value = rt->curvol;
 299                 return 0;
 300         }
 301         return -EINVAL;
 302 }
 303
 304 static int vidioc_s_ctrl(struct file *file, void *priv,
 305                                         struct v4l2_control *ctrl)
 306 {
 307         struct rtrack *rt = video_drvdata(file);
 308
 309         switch (ctrl->id) {
 310         case V4L2_CID_AUDIO_MUTE:
 311                 if (ctrl->value)
 312                         rt_mute(rt);
 313                 else
 314                         rt_setvol(rt, rt->curvol);
 315                 return 0;
 316         case V4L2_CID_AUDIO_VOLUME:
 317                 rt_setvol(rt, ctrl->value);
 318                 return 0;
 319         }
 320         return -EINVAL;
 321 }
 322
 323 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 324 {
 325         *i = 0;
 326         return 0;
 327 }
 328
 329 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 330 {
 331         return i ? -EINVAL : 0;
 332 }
 333
 334 static int vidioc_g_audio(struct file *file, void *priv,
 335                                         struct v4l2_audio *a)
 336 {
 337         a->index = 0;
 338         strlcpy(a->name, "Radio", sizeof(a->name));
 339         a->capability = V4L2_AUDCAP_STEREO;
 340         return 0;
 341 }
 342
 343 static int vidioc_s_audio(struct file *file, void *priv,
 344                                         struct v4l2_audio *a)
 345 {
 346         return a->index ? -EINVAL : 0;
 347 }
 348
 349 static const struct v4l2_file_operations rtrack_fops = {
 350         .owner          = THIS_MODULE,
 351         .unlocked_ioctl = video_ioctl2,
 352 };
 353
 354 static const struct v4l2_ioctl_ops rtrack_ioctl_ops = {
 355         .vidioc_querycap    = vidioc_querycap,
 356         .vidioc_g_tuner     = vidioc_g_tuner,
 357         .vidioc_s_tuner     = vidioc_s_tuner,
 358         .vidioc_g_audio     = vidioc_g_audio,
 359         .vidioc_s_audio     = vidioc_s_audio,
 360         .vidioc_g_input     = vidioc_g_input,
 361         .vidioc_s_input     = vidioc_s_input,
 362         .vidioc_g_frequency = vidioc_g_frequency,
 363         .vidioc_s_frequency = vidioc_s_frequency,
 364         .vidioc_queryctrl   = vidioc_queryctrl,
 365         .vidioc_g_ctrl      = vidioc_g_ctrl,
 366         .vidioc_s_ctrl      = vidioc_s_ctrl,
 367 };
 368
 369 static int __init rtrack_init(void)
 370 {
 371         struct rtrack *rt = &rtrack_card;
 372         struct v4l2_device *v4l2_dev = &rt->v4l2_dev;
 373         int res;
 374
 375         strlcpy(v4l2_dev->name, "rtrack", sizeof(v4l2_dev->name));
 376         rt->io = io;
 377
 378         if (rt->io == -1) {
 379                 v4l2_err(v4l2_dev, "you must set an I/O address with io=0x20f or 0x30f\n");
 380                 return -EINVAL;
 381         }
 382
 383         if (!request_region(rt->io, 2, "rtrack")) {
 384                 v4l2_err(v4l2_dev, "port 0x%x already in use\n", rt->io);
 385                 return -EBUSY;
 386         }
 387
 388         res = v4l2_device_register(NULL, v4l2_dev);
 389         if (res < 0) {
 390                 release_region(rt->io, 2);
 391                 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
 392                 return res;
 393         }
 394
 395         strlcpy(rt->vdev.name, v4l2_dev->name, sizeof(rt->vdev.name));
 396         rt->vdev.v4l2_dev = v4l2_dev;
 397         rt->vdev.fops = &rtrack_fops;
 398         rt->vdev.ioctl_ops = &rtrack_ioctl_ops;
 399         rt->vdev.release = video_device_release_empty;
 400         video_set_drvdata(&rt->vdev, rt);
 401
 402         /* Set up the I/O locking */
 403
 404         mutex_init(&rt->lock);
 405
 406         /* mute card - prevents noisy bootups */
 407
 408         /* this ensures that the volume is all the way down  */
 409         outb(0x48, rt->io);             /* volume down but still "on"   */
 410         msleep(2000);   /* make sure it's totally down  */
 411         outb(0xc0, rt->io);             /* steady volume, mute card     */
 412
 413         if (video_register_device(&rt->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 414                 v4l2_device_unregister(&rt->v4l2_dev);
 415                 release_region(rt->io, 2);
 416                 return -EINVAL;
 417         }
 418         v4l2_info(v4l2_dev, "AIMSlab RadioTrack/RadioReveal card driver.\n");
 419
 420         return 0;
 421 }
 422
 423 static void __exit rtrack_exit(void)
 424 {
 425         struct rtrack *rt = &rtrack_card;
 426
 427         video_unregister_device(&rt->vdev);
 428         v4l2_device_unregister(&rt->v4l2_dev);
 429         release_region(rt->io, 2);
 430 }
 431
 432 module_init(rtrack_init);
 433 module_exit(rtrack_exit);
 434