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 <asm/io.h>             /* outb, outb_p                 */
  22 #include <asm/uaccess.h>        /* copy to/from user            */
  23 #include <linux/videodev2.h>    /* kernel radio structs         */
  24 #include <media/v4l2-common.h>
  25 #include <media/v4l2-ioctl.h>
  26 #include <linux/mutex.h>
  27
  28 static struct mutex lock;
  29
  30 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  31 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  32
  33 #define AUD_VOL_INDEX 1
  34
  35 static struct v4l2_queryctrl radio_qctrl[] = {
  36         {
  37                 .id            = V4L2_CID_AUDIO_MUTE,
  38                 .name          = "Mute",
  39                 .minimum       = 0,
  40                 .maximum       = 1,
  41                 .default_value = 1,
  42                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  43         },
  44         [AUD_VOL_INDEX] = {
  45                 .id            = V4L2_CID_AUDIO_VOLUME,
  46                 .name          = "Volume",
  47                 .minimum       = 0,
  48                 .maximum       = 15,
  49                 .step          = 1,
  50                 .default_value = 0,
  51                 .type          = V4L2_CTRL_TYPE_INTEGER,
  52         }
  53 };
  54
  55 #undef DEBUG
  56 //#define DEBUG 1
  57
  58 #ifdef DEBUG
  59 # define  debug_print(s) printk s
  60 #else
  61 # define  debug_print(s)
  62 #endif
  63
  64 /* this should be static vars for module size */
  65 struct fmr2_device
  66 {
  67         unsigned long in_use;
  68         int port;
  69         int curvol; /* 0-15 */
  70         int mute;
  71         int stereo; /* card is producing stereo audio */
  72         unsigned long curfreq; /* freq in kHz */
  73         int card_type;
  74         __u32 flags;
  75 };
  76
  77 static int io = 0x384;
  78 static int radio_nr = -1;
  79
  80 /* hw precision is 12.5 kHz
  81  * It is only useful to give freq in intervall of 200 (=0.0125Mhz),
  82  * other bits will be truncated
  83  */
  84 #define RSF16_ENCODE(x) ((x)/200+856)
  85 #define RSF16_MINFREQ 87*16000
  86 #define RSF16_MAXFREQ 108*16000
  87
  88 static inline void wait(int n,int port)
  89 {
  90         for (;n;--n) inb(port);
  91 }
  92
  93 static void outbits(int bits, unsigned int data, int nWait, int port)
  94 {
  95         int bit;
  96         for(;--bits>=0;) {
  97                 bit = (data>>bits) & 1;
  98                 outb(bit,port);
  99                 wait(nWait,port);
 100                 outb(bit|2,port);
 101                 wait(nWait,port);
 102                 outb(bit,port);
 103                 wait(nWait,port);
 104         }
 105 }
 106
 107 static inline void fmr2_mute(int port)
 108 {
 109         outb(0x00, port);
 110         wait(4,port);
 111 }
 112
 113 static inline void fmr2_unmute(int port)
 114 {
 115         outb(0x04, port);
 116         wait(4,port);
 117 }
 118
 119 static inline int fmr2_stereo_mode(int port)
 120 {
 121         int n = inb(port);
 122         outb(6,port);
 123         inb(port);
 124         n = ((n>>3)&1)^1;
 125         debug_print((KERN_DEBUG "stereo: %d\n", n));
 126         return n;
 127 }
 128
 129 static int fmr2_product_info(struct fmr2_device *dev)
 130 {
 131         int n = inb(dev->port);
 132         n &= 0xC1;
 133         if (n == 0)
 134         {
 135                 /* this should support volume set */
 136                 dev->card_type = 12;
 137                 return 0;
 138         }
 139         /* not volume (mine is 11) */
 140         dev->card_type = (n==128)?11:0;
 141         return n;
 142 }
 143
 144 static inline int fmr2_getsigstr(struct fmr2_device *dev)
 145 {
 146         /* !!! work only if scanning freq */
 147         int port = dev->port, res = 0xffff;
 148         outb(5,port);
 149         wait(4,port);
 150         if (!(inb(port)&1)) res = 0;
 151         debug_print((KERN_DEBUG "signal: %d\n", res));
 152         return res;
 153 }
 154
 155 /* set frequency and unmute card */
 156 static int fmr2_setfreq(struct fmr2_device *dev)
 157 {
 158         int port = dev->port;
 159         unsigned long freq = dev->curfreq;
 160
 161         fmr2_mute(port);
 162
 163         /* 0x42 for mono output
 164          * 0x102 forward scanning
 165          * 0x182 scansione avanti
 166          */
 167         outbits(9,0x2,3,port);
 168         outbits(16,RSF16_ENCODE(freq),2,port);
 169
 170         fmr2_unmute(port);
 171
 172         /* wait 0.11 sec */
 173         msleep(110);
 174
 175         /* NOTE if mute this stop radio
 176            you must set freq on unmute */
 177         dev->stereo = fmr2_stereo_mode(port);
 178         return 0;
 179 }
 180
 181 /* !!! not tested, in my card this does't work !!! */
 182 static int fmr2_setvolume(struct fmr2_device *dev)
 183 {
 184         int vol[16] = { 0x021, 0x084, 0x090, 0x104,
 185                         0x110, 0x204, 0x210, 0x402,
 186                         0x404, 0x408, 0x410, 0x801,
 187                         0x802, 0x804, 0x808, 0x810 };
 188         int i, a, port = dev->port;
 189         int n = vol[dev->curvol & 0x0f];
 190
 191         if (dev->card_type != 11)
 192                 return 1;
 193
 194         for (i = 12; --i >= 0; ) {
 195                 a = ((n >> i) & 1) << 6; /* if (a=0) a= 0; else a= 0x40; */
 196                 outb(a | 4, port);
 197                 wait(4, port);
 198                 outb(a | 0x24, port);
 199                 wait(4, port);
 200                 outb(a | 4, port);
 201                 wait(4, port);
 202         }
 203         for (i = 6; --i >= 0; ) {
 204                 a = ((0x18 >> i) & 1) << 6;
 205                 outb(a | 4, port);
 206                 wait(4,port);
 207                 outb(a | 0x24, port);
 208                 wait(4,port);
 209                 outb(a|4, port);
 210                 wait(4,port);
 211         }
 212         wait(4, port);
 213         outb(0x14, port);
 214
 215         return 0;
 216 }
 217
 218 static int vidioc_querycap(struct file *file, void  *priv,
 219                                         struct v4l2_capability *v)
 220 {
 221         strlcpy(v->driver, "radio-sf16fmr2", sizeof(v->driver));
 222         strlcpy(v->card, "SF16-FMR2 radio", sizeof(v->card));
 223         sprintf(v->bus_info, "ISA");
 224         v->version = RADIO_VERSION;
 225         v->capabilities = V4L2_CAP_TUNER;
 226         return 0;
 227 }
 228
 229 static int vidioc_g_tuner(struct file *file, void *priv,
 230                                         struct v4l2_tuner *v)
 231 {
 232         int mult;
 233         struct fmr2_device *fmr2 = video_drvdata(file);
 234
 235         if (v->index > 0)
 236                 return -EINVAL;
 237
 238         strcpy(v->name, "FM");
 239         v->type = V4L2_TUNER_RADIO;
 240
 241         mult = (fmr2->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
 242         v->rangelow = RSF16_MINFREQ/mult;
 243         v->rangehigh = RSF16_MAXFREQ/mult;
 244         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
 245         v->capability = fmr2->flags&V4L2_TUNER_CAP_LOW;
 246         v->audmode = fmr2->stereo ? V4L2_TUNER_MODE_STEREO:
 247                                 V4L2_TUNER_MODE_MONO;
 248         mutex_lock(&lock);
 249         v->signal = fmr2_getsigstr(fmr2);
 250         mutex_unlock(&lock);
 251         return 0;
 252 }
 253
 254 static int vidioc_s_tuner(struct file *file, void *priv,
 255                                         struct v4l2_tuner *v)
 256 {
 257         if (v->index > 0)
 258                 return -EINVAL;
 259         return 0;
 260 }
 261
 262 static int vidioc_s_frequency(struct file *file, void *priv,
 263                                         struct v4l2_frequency *f)
 264 {
 265         struct fmr2_device *fmr2 = video_drvdata(file);
 266
 267         if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
 268                 f->frequency *= 1000;
 269         if (f->frequency < RSF16_MINFREQ ||
 270                         f->frequency > RSF16_MAXFREQ )
 271                 return -EINVAL;
 272         /*rounding in steps of 200 to match th freq
 273         that will be used */
 274         fmr2->curfreq = (f->frequency/200)*200;
 275
 276         /* set card freq (if not muted) */
 277         if (fmr2->curvol && !fmr2->mute) {
 278                 mutex_lock(&lock);
 279                 fmr2_setfreq(fmr2);
 280                 mutex_unlock(&lock);
 281         }
 282         return 0;
 283 }
 284
 285 static int vidioc_g_frequency(struct file *file, void *priv,
 286                                         struct v4l2_frequency *f)
 287 {
 288         struct fmr2_device *fmr2 = video_drvdata(file);
 289
 290         f->type = V4L2_TUNER_RADIO;
 291         f->frequency = fmr2->curfreq;
 292         if (!(fmr2->flags & V4L2_TUNER_CAP_LOW))
 293                 f->frequency /= 1000;
 294         return 0;
 295 }
 296
 297 static int vidioc_queryctrl(struct file *file, void *priv,
 298                                         struct v4l2_queryctrl *qc)
 299 {
 300         int i;
 301
 302         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 303                 if (qc->id && qc->id == radio_qctrl[i].id) {
 304                         memcpy(qc, &radio_qctrl[i], sizeof(*qc));
 305                         return 0;
 306                 }
 307         }
 308         return -EINVAL;
 309 }
 310
 311 static int vidioc_g_ctrl(struct file *file, void *priv,
 312                                         struct v4l2_control *ctrl)
 313 {
 314         struct fmr2_device *fmr2 = video_drvdata(file);
 315
 316         switch (ctrl->id) {
 317         case V4L2_CID_AUDIO_MUTE:
 318                 ctrl->value = fmr2->mute;
 319                 return 0;
 320         case V4L2_CID_AUDIO_VOLUME:
 321                 ctrl->value = fmr2->curvol;
 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 fmr2_device *fmr2 = video_drvdata(file);
 331
 332         switch (ctrl->id) {
 333         case V4L2_CID_AUDIO_MUTE:
 334                 fmr2->mute = ctrl->value;
 335                 break;
 336         case V4L2_CID_AUDIO_VOLUME:
 337                 if (ctrl->value > radio_qctrl[AUD_VOL_INDEX].maximum)
 338                         fmr2->curvol = radio_qctrl[AUD_VOL_INDEX].maximum;
 339                 else
 340                         fmr2->curvol = ctrl->value;
 341
 342                 break;
 343         default:
 344                 return -EINVAL;
 345         }
 346
 347 #ifdef DEBUG
 348         if (fmr2->curvol && !fmr2->mute)
 349                 printk(KERN_DEBUG "unmute\n");
 350         else
 351                 printk(KERN_DEBUG "mute\n");
 352 #endif
 353
 354         mutex_lock(&lock);
 355         if (fmr2->curvol && !fmr2->mute) {
 356                 fmr2_setvolume(fmr2);
 357                 /* Set frequency and unmute card */
 358                 fmr2_setfreq(fmr2);
 359         } else
 360                 fmr2_mute(fmr2->port);
 361         mutex_unlock(&lock);
 362         return 0;
 363 }
 364
 365 static int vidioc_g_audio(struct file *file, void *priv,
 366                                         struct v4l2_audio *a)
 367 {
 368         if (a->index > 1)
 369                 return -EINVAL;
 370
 371         strcpy(a->name, "Radio");
 372         a->capability = V4L2_AUDCAP_STEREO;
 373         return 0;
 374 }
 375
 376 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 377 {
 378         *i = 0;
 379         return 0;
 380 }
 381
 382 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 383 {
 384         if (i != 0)
 385                 return -EINVAL;
 386         return 0;
 387 }
 388
 389 static int vidioc_s_audio(struct file *file, void *priv,
 390                                         struct v4l2_audio *a)
 391 {
 392         if (a->index != 0)
 393                 return -EINVAL;
 394         return 0;
 395 }
 396
 397 static struct fmr2_device fmr2_unit;
 398
 399 static int fmr2_exclusive_open(struct inode *inode, struct file *file)
 400 {
 401         return test_and_set_bit(0, &fmr2_unit.in_use) ? -EBUSY : 0;
 402 }
 403
 404 static int fmr2_exclusive_release(struct inode *inode, struct file *file)
 405 {
 406         clear_bit(0, &fmr2_unit.in_use);
 407         return 0;
 408 }
 409
 410 static const struct file_operations fmr2_fops = {
 411         .owner          = THIS_MODULE,
 412         .open           = fmr2_exclusive_open,
 413         .release        = fmr2_exclusive_release,
 414         .ioctl          = video_ioctl2,
 415 #ifdef CONFIG_COMPAT
 416         .compat_ioctl   = v4l_compat_ioctl32,
 417 #endif
 418         .llseek         = no_llseek,
 419 };
 420
 421 static const struct v4l2_ioctl_ops fmr2_ioctl_ops = {
 422         .vidioc_querycap    = vidioc_querycap,
 423         .vidioc_g_tuner     = vidioc_g_tuner,
 424         .vidioc_s_tuner     = vidioc_s_tuner,
 425         .vidioc_g_audio     = vidioc_g_audio,
 426         .vidioc_s_audio     = vidioc_s_audio,
 427         .vidioc_g_input     = vidioc_g_input,
 428         .vidioc_s_input     = vidioc_s_input,
 429         .vidioc_g_frequency = vidioc_g_frequency,
 430         .vidioc_s_frequency = vidioc_s_frequency,
 431         .vidioc_queryctrl   = vidioc_queryctrl,
 432         .vidioc_g_ctrl      = vidioc_g_ctrl,
 433         .vidioc_s_ctrl      = vidioc_s_ctrl,
 434 };
 435
 436 static struct video_device fmr2_radio = {
 437         .name           = "SF16FMR2 radio",
 438         .fops           = &fmr2_fops,
 439         .ioctl_ops      = &fmr2_ioctl_ops,
 440         .release        = video_device_release_empty,
 441 };
 442
 443 static int __init fmr2_init(void)
 444 {
 445         fmr2_unit.port = io;
 446         fmr2_unit.curvol = 0;
 447         fmr2_unit.mute = 0;
 448         fmr2_unit.curfreq = 0;
 449         fmr2_unit.stereo = 1;
 450         fmr2_unit.flags = V4L2_TUNER_CAP_LOW;
 451         fmr2_unit.card_type = 0;
 452         video_set_drvdata(&fmr2_radio, &fmr2_unit);
 453
 454         mutex_init(&lock);
 455
 456         if (!request_region(io, 2, "sf16fmr2")) {
 457                 printk(KERN_ERR "radio-sf16fmr2: request_region failed!\n");
 458                 return -EBUSY;
 459         }
 460
 461         if (video_register_device(&fmr2_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 462                 release_region(io, 2);
 463                 return -EINVAL;
 464         }
 465
 466         printk(KERN_INFO "SF16FMR2 radio card driver at 0x%x.\n", io);
 467         /* mute card - prevents noisy bootups */
 468         mutex_lock(&lock);
 469         fmr2_mute(io);
 470         fmr2_product_info(&fmr2_unit);
 471         mutex_unlock(&lock);
 472         debug_print((KERN_DEBUG "card_type %d\n", fmr2_unit.card_type));
 473
 474         /* Only card_type == 11 implements volume */
 475         if (fmr2_unit.card_type != 11)
 476                 radio_qctrl[AUD_VOL_INDEX].maximum = 1;
 477
 478         return 0;
 479 }
 480
 481 MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
 482 MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
 483 MODULE_LICENSE("GPL");
 484
 485 module_param(io, int, 0);
 486 MODULE_PARM_DESC(io, "I/O address of the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
 487 module_param(radio_nr, int, 0);
 488
 489 static void __exit fmr2_cleanup_module(void)
 490 {
 491         video_unregister_device(&fmr2_radio);
 492         release_region(io,2);
 493 }
 494
 495 module_init(fmr2_init);
 496 module_exit(fmr2_cleanup_module);
 497
 498 #ifndef MODULE
 499
 500 static int __init fmr2_setup_io(char *str)
 501 {
 502         get_option(&str, &io);
 503         return 1;
 504 }
 505
 506 __setup("sf16fmr2=", fmr2_setup_io);
 507
 508 #endif