drivers/media/radio/radio-terratec.c

   1 /* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
   2  * (c) 1999 R. Offermanns (rolf@offermanns.de)
   3  * based on the aimslab radio driver from M. Kirkwood
   4  * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
   5  *
   6  *
   7  * History:
   8  * 1999-05-21   First preview release
   9  *
  10  *  Notes on the hardware:
  11  *  There are two "main" chips on the card:
  12  *  - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
  13  *  - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
  14  *  (you can get the datasheet at the above links)
  15  *
  16  *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
  17  *  Volume Control is done digitally
  18  *
  19  *  there is a I2C controlled RDS decoder (SAA6588)  onboard, which i would like to support someday
  20  *  (as soon i have understand how to get started :)
  21  *  If you can help me out with that, please contact me!!
  22  *
  23  *
  24  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  25  */
  26
  27 #include <linux/module.h>       /* Modules                      */
  28 #include <linux/init.h>         /* Initdata                     */
  29 #include <linux/ioport.h>       /* request_region               */
  30 #include <linux/delay.h>        /* udelay                       */
  31 #include <asm/io.h>             /* outb, outb_p                 */
  32 #include <asm/uaccess.h>        /* copy to/from user            */
  33 #include <linux/videodev2.h>    /* kernel radio structs         */
  34 #include <media/v4l2-common.h>
  35 #include <linux/spinlock.h>
  36
  37 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  38 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  39
  40 static struct v4l2_queryctrl radio_qctrl[] = {
  41         {
  42                 .id            = V4L2_CID_AUDIO_MUTE,
  43                 .name          = "Mute",
  44                 .minimum       = 0,
  45                 .maximum       = 1,
  46                 .default_value = 1,
  47                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  48         },{
  49                 .id            = V4L2_CID_AUDIO_VOLUME,
  50                 .name          = "Volume",
  51                 .minimum       = 0,
  52                 .maximum       = 0xff,
  53                 .step          = 1,
  54                 .default_value = 0xff,
  55                 .type          = V4L2_CTRL_TYPE_INTEGER,
  56         }
  57 };
  58
  59 #ifndef CONFIG_RADIO_TERRATEC_PORT
  60 #define CONFIG_RADIO_TERRATEC_PORT 0x590
  61 #endif
  62
  63 /**************** this ones are for the terratec *******************/
  64 #define BASEPORT        0x590
  65 #define VOLPORT         0x591
  66 #define WRT_DIS         0x00
  67 #define CLK_OFF         0x00
  68 #define IIC_DATA        0x01
  69 #define IIC_CLK         0x02
  70 #define DATA            0x04
  71 #define CLK_ON          0x08
  72 #define WRT_EN          0x10
  73 /*******************************************************************/
  74
  75 static int io = CONFIG_RADIO_TERRATEC_PORT;
  76 static int radio_nr = -1;
  77 static spinlock_t lock;
  78
  79 struct tt_device
  80 {
  81         int port;
  82         int curvol;
  83         unsigned long curfreq;
  84         int muted;
  85 };
  86
  87
  88 /* local things */
  89
  90 static void cardWriteVol(int volume)
  91 {
  92         int i;
  93         volume = volume+(volume * 32); // change both channels
  94         spin_lock(&lock);
  95         for (i=0;i<8;i++)
  96         {
  97                 if (volume & (0x80>>i))
  98                         outb(0x80, VOLPORT);
  99                 else outb(0x00, VOLPORT);
 100         }
 101         spin_unlock(&lock);
 102 }
 103
 104
 105
 106 static void tt_mute(struct tt_device *dev)
 107 {
 108         dev->muted = 1;
 109         cardWriteVol(0);
 110 }
 111
 112 static int tt_setvol(struct tt_device *dev, int vol)
 113 {
 114
 115 //      printk(KERN_ERR "setvol called, vol = %d\n", vol);
 116
 117         if(vol == dev->curvol) {        /* requested volume = current */
 118                 if (dev->muted) {       /* user is unmuting the card  */
 119                         dev->muted = 0;
 120                         cardWriteVol(vol);      /* enable card */
 121                 }
 122
 123                 return 0;
 124         }
 125
 126         if(vol == 0) {                  /* volume = 0 means mute the card */
 127                 cardWriteVol(0);        /* "turn off card" by setting vol to 0 */
 128                 dev->curvol = vol;      /* track the volume state!      */
 129                 return 0;
 130         }
 131
 132         dev->muted = 0;
 133
 134         cardWriteVol(vol);
 135
 136         dev->curvol = vol;
 137
 138         return 0;
 139
 140 }
 141
 142
 143 /* this is the worst part in this driver */
 144 /* many more or less strange things are going on here, but hey, it works :) */
 145
 146 static int tt_setfreq(struct tt_device *dev, unsigned long freq1)
 147 {
 148         int freq;
 149         int i;
 150         int p;
 151         int  temp;
 152         long rest;
 153
 154         unsigned char buffer[25];               /* we have to bit shift 25 registers */
 155         freq = freq1/160;                       /* convert the freq. to a nice to handle value */
 156         for(i=24;i>-1;i--)
 157                 buffer[i]=0;
 158
 159         rest = freq*10+10700;           /* i once had understood what is going on here */
 160                                         /* maybe some wise guy (friedhelm?) can comment this stuff */
 161         i=13;
 162         p=10;
 163         temp=102400;
 164         while (rest!=0)
 165         {
 166                 if (rest%temp  == rest)
 167                         buffer[i] = 0;
 168                 else
 169                 {
 170                         buffer[i] = 1;
 171                         rest = rest-temp;
 172                 }
 173                 i--;
 174                 p--;
 175                 temp = temp/2;
 176         }
 177
 178         spin_lock(&lock);
 179
 180         for (i=24;i>-1;i--)                     /* bit shift the values to the radiocard */
 181         {
 182                 if (buffer[i]==1)
 183                 {
 184                         outb(WRT_EN|DATA, BASEPORT);
 185                         outb(WRT_EN|DATA|CLK_ON  , BASEPORT);
 186                         outb(WRT_EN|DATA, BASEPORT);
 187                 }
 188                 else
 189                 {
 190                         outb(WRT_EN|0x00, BASEPORT);
 191                         outb(WRT_EN|0x00|CLK_ON  , BASEPORT);
 192                 }
 193         }
 194         outb(0x00, BASEPORT);
 195
 196         spin_unlock(&lock);
 197
 198         return 0;
 199 }
 200
 201 static int tt_getsigstr(struct tt_device *dev)          /* TODO */
 202 {
 203         if (inb(io) & 2)        /* bit set = no signal present  */
 204                 return 0;
 205         return 1;               /* signal present               */
 206 }
 207
 208 static int vidioc_querycap(struct file *file, void *priv,
 209                                         struct v4l2_capability *v)
 210 {
 211         strlcpy(v->driver, "radio-terratec", sizeof(v->driver));
 212         strlcpy(v->card, "ActiveRadio", sizeof(v->card));
 213         sprintf(v->bus_info, "ISA");
 214         v->version = RADIO_VERSION;
 215         v->capabilities = V4L2_CAP_TUNER;
 216         return 0;
 217 }
 218
 219 static int vidioc_g_tuner(struct file *file, void *priv,
 220                                         struct v4l2_tuner *v)
 221 {
 222         struct video_device *dev = video_devdata(file);
 223         struct tt_device *tt = dev->priv;
 224
 225         if (v->index > 0)
 226                 return -EINVAL;
 227
 228         strcpy(v->name, "FM");
 229         v->type = V4L2_TUNER_RADIO;
 230         v->rangelow = (87*16000);
 231         v->rangehigh = (108*16000);
 232         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 233         v->capability = V4L2_TUNER_CAP_LOW;
 234         v->audmode = V4L2_TUNER_MODE_MONO;
 235         v->signal = 0xFFFF*tt_getsigstr(tt);
 236         return 0;
 237 }
 238
 239 static int vidioc_s_tuner(struct file *file, void *priv,
 240                                         struct v4l2_tuner *v)
 241 {
 242         if (v->index > 0)
 243                 return -EINVAL;
 244         return 0;
 245 }
 246
 247 static int vidioc_s_frequency(struct file *file, void *priv,
 248                                         struct v4l2_frequency *f)
 249 {
 250         struct video_device *dev = video_devdata(file);
 251         struct tt_device *tt = dev->priv;
 252
 253         tt->curfreq = f->frequency;
 254         tt_setfreq(tt, tt->curfreq);
 255         return 0;
 256 }
 257
 258 static int vidioc_g_frequency(struct file *file, void *priv,
 259                                         struct v4l2_frequency *f)
 260 {
 261         struct video_device *dev = video_devdata(file);
 262         struct tt_device *tt = dev->priv;
 263
 264         f->type = V4L2_TUNER_RADIO;
 265         f->frequency = tt->curfreq;
 266         return 0;
 267 }
 268
 269 static int vidioc_queryctrl(struct file *file, void *priv,
 270                                         struct v4l2_queryctrl *qc)
 271 {
 272         int i;
 273
 274         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 275                 if (qc->id && qc->id == radio_qctrl[i].id) {
 276                         memcpy(qc, &(radio_qctrl[i]),
 277                                                 sizeof(*qc));
 278                         return 0;
 279                 }
 280         }
 281         return -EINVAL;
 282 }
 283
 284 static int vidioc_g_ctrl(struct file *file, void *priv,
 285                                         struct v4l2_control *ctrl)
 286 {
 287         struct video_device *dev = video_devdata(file);
 288         struct tt_device *tt = dev->priv;
 289
 290         switch (ctrl->id) {
 291         case V4L2_CID_AUDIO_MUTE:
 292                 if (tt->muted)
 293                         ctrl->value = 1;
 294                 else
 295                         ctrl->value = 0;
 296                 return 0;
 297         case V4L2_CID_AUDIO_VOLUME:
 298                 ctrl->value = tt->curvol * 6554;
 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 video_device *dev = video_devdata(file);
 308         struct tt_device *tt = dev->priv;
 309
 310         switch (ctrl->id) {
 311         case V4L2_CID_AUDIO_MUTE:
 312                 if (ctrl->value)
 313                         tt_mute(tt);
 314                 else
 315                         tt_setvol(tt,tt->curvol);
 316                 return 0;
 317         case V4L2_CID_AUDIO_VOLUME:
 318                 tt_setvol(tt,ctrl->value);
 319                 return 0;
 320         }
 321         return -EINVAL;
 322 }
 323
 324 static int vidioc_g_audio(struct file *file, void *priv,
 325                                         struct v4l2_audio *a)
 326 {
 327         if (a->index > 1)
 328                 return -EINVAL;
 329
 330         strcpy(a->name, "Radio");
 331         a->capability = V4L2_AUDCAP_STEREO;
 332         return 0;
 333 }
 334
 335 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 336 {
 337         *i = 0;
 338         return 0;
 339 }
 340
 341 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 342 {
 343         if (i != 0)
 344                 return -EINVAL;
 345         return 0;
 346 }
 347
 348 static int vidioc_s_audio(struct file *file, void *priv,
 349                                         struct v4l2_audio *a)
 350 {
 351         if (a->index != 0)
 352                 return -EINVAL;
 353         return 0;
 354 }
 355
 356 static struct tt_device terratec_unit;
 357
 358 static const struct file_operations terratec_fops = {
 359         .owner          = THIS_MODULE,
 360         .open           = video_exclusive_open,
 361         .release        = video_exclusive_release,
 362         .ioctl          = video_ioctl2,
 363         .compat_ioctl   = v4l_compat_ioctl32,
 364         .llseek         = no_llseek,
 365 };
 366
 367 static struct video_device terratec_radio=
 368 {
 369         .owner          = THIS_MODULE,
 370         .name           = "TerraTec ActiveRadio",
 371         .type           = VID_TYPE_TUNER,
 372         .fops           = &terratec_fops,
 373         .vidioc_querycap    = vidioc_querycap,
 374         .vidioc_g_tuner     = vidioc_g_tuner,
 375         .vidioc_s_tuner     = vidioc_s_tuner,
 376         .vidioc_g_frequency = vidioc_g_frequency,
 377         .vidioc_s_frequency = vidioc_s_frequency,
 378         .vidioc_queryctrl   = vidioc_queryctrl,
 379         .vidioc_g_ctrl      = vidioc_g_ctrl,
 380         .vidioc_s_ctrl      = vidioc_s_ctrl,
 381         .vidioc_g_audio     = vidioc_g_audio,
 382         .vidioc_s_audio     = vidioc_s_audio,
 383         .vidioc_g_input     = vidioc_g_input,
 384         .vidioc_s_input     = vidioc_s_input,
 385 };
 386
 387 static int __init terratec_init(void)
 388 {
 389         if(io==-1)
 390         {
 391                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 392                 return -EINVAL;
 393         }
 394         if (!request_region(io, 2, "terratec"))
 395         {
 396                 printk(KERN_ERR "TerraTec: port 0x%x already in use\n", io);
 397                 return -EBUSY;
 398         }
 399
 400         terratec_radio.priv=&terratec_unit;
 401
 402         spin_lock_init(&lock);
 403
 404         if(video_register_device(&terratec_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 405         {
 406                 release_region(io,2);
 407                 return -EINVAL;
 408         }
 409
 410         printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver.\n");
 411
 412         /* mute card - prevents noisy bootups */
 413
 414         /* this ensures that the volume is all the way down  */
 415         cardWriteVol(0);
 416         terratec_unit.curvol = 0;
 417
 418         return 0;
 419 }
 420
 421 MODULE_AUTHOR("R.OFFERMANNS & others");
 422 MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
 423 MODULE_LICENSE("GPL");
 424 module_param(io, int, 0);
 425 MODULE_PARM_DESC(io, "I/O address of the TerraTec ActiveRadio card (0x590 or 0x591)");
 426 module_param(radio_nr, int, 0);
 427
 428 static void __exit terratec_cleanup_module(void)
 429 {
 430         video_unregister_device(&terratec_radio);
 431         release_region(io,2);
 432         printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver unloaded.\n");
 433 }
 434
 435 module_init(terratec_init);
 436 module_exit(terratec_cleanup_module);
 437