drivers/media/radio/radio-sf16fmr2.c

   1 /* SF16FMR2 radio driver for Linux radio support
   2  * heavily based on fmi driver...
   3  * (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
   4  *
   5  * Notes on the hardware
   6  *
   7  *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
   8  *  No volume control - only mute/unmute - you have to use line volume
   9  *
  10  *  For read stereo/mono you must wait 0.1 sec after set frequency and
  11  *  card unmuted so I set frequency on unmute
  12  *  Signal handling seem to work only on autoscanning (not implemented)
  13  *
  14  *  Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  15  */
  16
  17 #include <linux/module.h>       /* Modules                      */
  18 #include <linux/init.h>         /* Initdata                     */
  19 #include <linux/ioport.h>       /* request_region               */
  20 #include <linux/delay.h>        /* udelay                       */
  21 #include <linux/videodev2.h>    /* kernel radio structs         */
  22 #include <linux/mutex.h>
  23 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  24 #include <linux/io.h>           /* outb, outb_p                 */
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-ioctl.h>
  27
  28 MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
  29 MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
  30 MODULE_LICENSE("GPL");
  31
  32 static int io = 0x384;
  33 static int radio_nr = -1;
  34
  35 module_param(io, int, 0);
  36 MODULE_PARM_DESC(io, "I/O address of the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
  37 module_param(radio_nr, int, 0);
  38
  39 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  40
  41 #define AUD_VOL_INDEX 1
  42
  43 #undef DEBUG
  44 //#define DEBUG 1
  45
  46 #ifdef DEBUG
  47 # define  debug_print(s) printk s
  48 #else
  49 # define  debug_print(s)
  50 #endif
  51
  52 /* this should be static vars for module size */
  53 struct fmr2
  54 {
  55         struct v4l2_device v4l2_dev;
  56         struct video_device vdev;
  57         struct mutex lock;
  58         int io;
  59         int curvol; /* 0-15 */
  60         int mute;
  61         int stereo; /* card is producing stereo audio */
  62         unsigned long curfreq; /* freq in kHz */
  63         int card_type;
  64 };
  65
  66 static struct fmr2 fmr2_card;
  67
  68 /* hw precision is 12.5 kHz
  69  * It is only useful to give freq in interval of 200 (=0.0125Mhz),
  70  * other bits will be truncated
  71  */
  72 #define RSF16_ENCODE(x) ((x) / 200 + 856)
  73 #define RSF16_MINFREQ (87 * 16000)
  74 #define RSF16_MAXFREQ (108 * 16000)
  75
  76 static inline void wait(int n, int io)
  77 {
  78         for (; n; --n)
  79                 inb(io);
  80 }
  81
  82 static void outbits(int bits, unsigned int data, int nWait, int io)
  83 {
  84         int bit;
  85
  86         for (; --bits >= 0;) {
  87                 bit = (data >> bits) & 1;
  88                 outb(bit, io);
  89                 wait(nWait, io);
  90                 outb(bit | 2, io);
  91                 wait(nWait, io);
  92                 outb(bit, io);
  93                 wait(nWait, io);
  94         }
  95 }
  96
  97 static inline void fmr2_mute(int io)
  98 {
  99         outb(0x00, io);
 100         wait(4, io);
 101 }
 102
 103 static inline void fmr2_unmute(int io)
 104 {
 105         outb(0x04, io);
 106         wait(4, io);
 107 }
 108
 109 static inline int fmr2_stereo_mode(int io)
 110 {
 111         int n = inb(io);
 112
 113         outb(6, io);
 114         inb(io);
 115         n = ((n >> 3) & 1) ^ 1;
 116         debug_print((KERN_DEBUG "stereo: %d\n", n));
 117         return n;
 118 }
 119
 120 static int fmr2_product_info(struct fmr2 *dev)
 121 {
 122         int n = inb(dev->io);
 123
 124         n &= 0xC1;
 125         if (n == 0) {
 126                 /* this should support volume set */
 127                 dev->card_type = 12;
 128                 return 0;
 129         }
 130         /* not volume (mine is 11) */
 131         dev->card_type = (n == 128) ? 11 : 0;
 132         return n;
 133 }
 134
 135 static inline int fmr2_getsigstr(struct fmr2 *dev)
 136 {
 137         /* !!! works only if scanning freq */
 138         int res = 0xffff;
 139
 140         outb(5, dev->io);
 141         wait(4, dev->io);
 142         if (!(inb(dev->io) & 1))
 143                 res = 0;
 144         debug_print((KERN_DEBUG "signal: %d\n", res));
 145         return res;
 146 }
 147
 148 /* set frequency and unmute card */
 149 static int fmr2_setfreq(struct fmr2 *dev)
 150 {
 151         unsigned long freq = dev->curfreq;
 152
 153         fmr2_mute(dev->io);
 154
 155         /* 0x42 for mono output
 156          * 0x102 forward scanning
 157          * 0x182 scansione avanti
 158          */
 159         outbits(9, 0x2, 3, dev->io);
 160         outbits(16, RSF16_ENCODE(freq), 2, dev->io);
 161
 162         fmr2_unmute(dev->io);
 163
 164         /* wait 0.11 sec */
 165         msleep(110);
 166
 167         /* NOTE if mute this stop radio
 168            you must set freq on unmute */
 169         dev->stereo = fmr2_stereo_mode(dev->io);
 170         return 0;
 171 }
 172
 173 /* !!! not tested, in my card this does't work !!! */
 174 static int fmr2_setvolume(struct fmr2 *dev)
 175 {
 176         int vol[16] = { 0x021, 0x084, 0x090, 0x104,
 177                         0x110, 0x204, 0x210, 0x402,
 178                         0x404, 0x408, 0x410, 0x801,
 179                         0x802, 0x804, 0x808, 0x810 };
 180         int i, a;
 181         int n = vol[dev->curvol & 0x0f];
 182
 183         if (dev->card_type != 11)
 184                 return 1;
 185
 186         for (i = 12; --i >= 0; ) {
 187                 a = ((n >> i) & 1) << 6; /* if (a==0) a = 0; else a = 0x40; */
 188                 outb(a | 4, dev->io);
 189                 wait(4, dev->io);
 190                 outb(a | 0x24, dev->io);
 191                 wait(4, dev->io);
 192                 outb(a | 4, dev->io);
 193                 wait(4, dev->io);
 194         }
 195         for (i = 6; --i >= 0; ) {
 196                 a = ((0x18 >> i) & 1) << 6;
 197                 outb(a | 4, dev->io);
 198                 wait(4, dev->io);
 199                 outb(a | 0x24, dev->io);
 200                 wait(4, dev->io);
 201                 outb(a | 4, dev->io);
 202                 wait(4, dev->io);
 203         }
 204         wait(4, dev->io);
 205         outb(0x14, dev->io);
 206         return 0;
 207 }
 208
 209 static int vidioc_querycap(struct file *file, void  *priv,
 210                                         struct v4l2_capability *v)
 211 {
 212         strlcpy(v->driver, "radio-sf16fmr2", sizeof(v->driver));
 213         strlcpy(v->card, "SF16-FMR2 radio", sizeof(v->card));
 214         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 215         v->version = RADIO_VERSION;
 216         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 217         return 0;
 218 }
 219
 220 static int vidioc_g_tuner(struct file *file, void *priv,
 221                                         struct v4l2_tuner *v)
 222 {
 223         struct fmr2 *fmr2 = video_drvdata(file);
 224
 225         if (v->index > 0)
 226                 return -EINVAL;
 227
 228         strlcpy(v->name, "FM", sizeof(v->name));
 229         v->type = V4L2_TUNER_RADIO;
 230
 231         v->rangelow = RSF16_MINFREQ;
 232         v->rangehigh = RSF16_MAXFREQ;
 233         v->rxsubchans = fmr2->stereo ? V4L2_TUNER_SUB_STEREO :
 234                                         V4L2_TUNER_SUB_MONO;
 235         v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
 236         v->audmode = V4L2_TUNER_MODE_STEREO;
 237         mutex_lock(&fmr2->lock);
 238         v->signal = fmr2_getsigstr(fmr2);
 239         mutex_unlock(&fmr2->lock);
 240         return 0;
 241 }
 242
 243 static int vidioc_s_tuner(struct file *file, void *priv,
 244                                         struct v4l2_tuner *v)
 245 {
 246         return v->index ? -EINVAL : 0;
 247 }
 248
 249 static int vidioc_s_frequency(struct file *file, void *priv,
 250                                         struct v4l2_frequency *f)
 251 {
 252         struct fmr2 *fmr2 = video_drvdata(file);
 253
 254         if (f->frequency < RSF16_MINFREQ ||
 255                         f->frequency > RSF16_MAXFREQ)
 256                 return -EINVAL;
 257         /* rounding in steps of 200 to match the freq
 258            that will be used */
 259         fmr2->curfreq = (f->frequency / 200) * 200;
 260
 261         /* set card freq (if not muted) */
 262         if (fmr2->curvol && !fmr2->mute) {
 263                 mutex_lock(&fmr2->lock);
 264                 fmr2_setfreq(fmr2);
 265                 mutex_unlock(&fmr2->lock);
 266         }
 267         return 0;
 268 }
 269
 270 static int vidioc_g_frequency(struct file *file, void *priv,
 271                                         struct v4l2_frequency *f)
 272 {
 273         struct fmr2 *fmr2 = video_drvdata(file);
 274
 275         f->type = V4L2_TUNER_RADIO;
 276         f->frequency = fmr2->curfreq;
 277         return 0;
 278 }
 279
 280 static int vidioc_queryctrl(struct file *file, void *priv,
 281                                         struct v4l2_queryctrl *qc)
 282 {
 283         struct fmr2 *fmr2 = video_drvdata(file);
 284
 285         switch (qc->id) {
 286         case V4L2_CID_AUDIO_MUTE:
 287                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 288         case V4L2_CID_AUDIO_VOLUME:
 289                 /* Only card_type == 11 implements volume */
 290                 if (fmr2->card_type == 11)
 291                         return v4l2_ctrl_query_fill(qc, 0, 15, 1, 0);
 292                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
 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 fmr2 *fmr2 = video_drvdata(file);
 301
 302         switch (ctrl->id) {
 303         case V4L2_CID_AUDIO_MUTE:
 304                 ctrl->value = fmr2->mute;
 305                 return 0;
 306         case V4L2_CID_AUDIO_VOLUME:
 307                 ctrl->value = fmr2->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 fmr2 *fmr2 = video_drvdata(file);
 317
 318         switch (ctrl->id) {
 319         case V4L2_CID_AUDIO_MUTE:
 320                 fmr2->mute = ctrl->value;
 321                 break;
 322         case V4L2_CID_AUDIO_VOLUME:
 323                 fmr2->curvol = ctrl->value;
 324                 break;
 325         default:
 326                 return -EINVAL;
 327         }
 328
 329 #ifdef DEBUG
 330         if (fmr2->curvol && !fmr2->mute)
 331                 printk(KERN_DEBUG "unmute\n");
 332         else
 333                 printk(KERN_DEBUG "mute\n");
 334 #endif
 335
 336         mutex_lock(&fmr2->lock);
 337         if (fmr2->curvol && !fmr2->mute) {
 338                 fmr2_setvolume(fmr2);
 339                 /* Set frequency and unmute card */
 340                 fmr2_setfreq(fmr2);
 341         } else
 342                 fmr2_mute(fmr2->io);
 343         mutex_unlock(&fmr2->lock);
 344         return 0;
 345 }
 346
 347 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 348 {
 349         *i = 0;
 350         return 0;
 351 }
 352
 353 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 354 {
 355         return i ? -EINVAL : 0;
 356 }
 357
 358 static int vidioc_g_audio(struct file *file, void *priv,
 359                                         struct v4l2_audio *a)
 360 {
 361         a->index = 0;
 362         strlcpy(a->name, "Radio", sizeof(a->name));
 363         a->capability = V4L2_AUDCAP_STEREO;
 364         return 0;
 365 }
 366
 367 static int vidioc_s_audio(struct file *file, void *priv,
 368                                         struct v4l2_audio *a)
 369 {
 370         return a->index ? -EINVAL : 0;
 371 }
 372
 373 static const struct v4l2_file_operations fmr2_fops = {
 374         .owner          = THIS_MODULE,
 375         .ioctl          = video_ioctl2,
 376 };
 377
 378 static const struct v4l2_ioctl_ops fmr2_ioctl_ops = {
 379         .vidioc_querycap    = vidioc_querycap,
 380         .vidioc_g_tuner     = vidioc_g_tuner,
 381         .vidioc_s_tuner     = vidioc_s_tuner,
 382         .vidioc_g_audio     = vidioc_g_audio,
 383         .vidioc_s_audio     = vidioc_s_audio,
 384         .vidioc_g_input     = vidioc_g_input,
 385         .vidioc_s_input     = vidioc_s_input,
 386         .vidioc_g_frequency = vidioc_g_frequency,
 387         .vidioc_s_frequency = vidioc_s_frequency,
 388         .vidioc_queryctrl   = vidioc_queryctrl,
 389         .vidioc_g_ctrl      = vidioc_g_ctrl,
 390         .vidioc_s_ctrl      = vidioc_s_ctrl,
 391 };
 392
 393 static int __init fmr2_init(void)
 394 {
 395         struct fmr2 *fmr2 = &fmr2_card;
 396         struct v4l2_device *v4l2_dev = &fmr2->v4l2_dev;
 397         int res;
 398
 399         strlcpy(v4l2_dev->name, "sf16fmr2", sizeof(v4l2_dev->name));
 400         fmr2->io = io;
 401         fmr2->stereo = 1;
 402         mutex_init(&fmr2->lock);
 403
 404         if (!request_region(fmr2->io, 2, "sf16fmr2")) {
 405                 v4l2_err(v4l2_dev, "request_region failed!\n");
 406                 return -EBUSY;
 407         }
 408
 409         res = v4l2_device_register(NULL, v4l2_dev);
 410         if (res < 0) {
 411                 release_region(fmr2->io, 2);
 412                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 413                 return res;
 414         }
 415
 416         strlcpy(fmr2->vdev.name, v4l2_dev->name, sizeof(fmr2->vdev.name));
 417         fmr2->vdev.v4l2_dev = v4l2_dev;
 418         fmr2->vdev.fops = &fmr2_fops;
 419         fmr2->vdev.ioctl_ops = &fmr2_ioctl_ops;
 420         fmr2->vdev.release = video_device_release_empty;
 421         video_set_drvdata(&fmr2->vdev, fmr2);
 422
 423         if (video_register_device(&fmr2->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 424                 v4l2_device_unregister(v4l2_dev);
 425                 release_region(fmr2->io, 2);
 426                 return -EINVAL;
 427         }
 428
 429         v4l2_info(v4l2_dev, "SF16FMR2 radio card driver at 0x%x.\n", fmr2->io);
 430         /* mute card - prevents noisy bootups */
 431         mutex_lock(&fmr2->lock);
 432         fmr2_mute(fmr2->io);
 433         fmr2_product_info(fmr2);
 434         mutex_unlock(&fmr2->lock);
 435         debug_print((KERN_DEBUG "card_type %d\n", fmr2->card_type));
 436         return 0;
 437 }
 438
 439 static void __exit fmr2_exit(void)
 440 {
 441         struct fmr2 *fmr2 = &fmr2_card;
 442
 443         video_unregister_device(&fmr2->vdev);
 444         v4l2_device_unregister(&fmr2->v4l2_dev);
 445         release_region(fmr2->io, 2);
 446 }
 447
 448 module_init(fmr2_init);
 449 module_exit(fmr2_exit);
 450
 451 #ifndef MODULE
 452
 453 static int __init fmr2_setup_io(char *str)
 454 {
 455         get_option(&str, &io);
 456         return 1;
 457 }
 458
 459 __setup("sf16fmr2=", fmr2_setup_io);
 460
 461 #endif