drivers/media/video/tuner-core.c

   1 /*
   2  * $Id: tuner-core.c,v 1.5 2005/02/15 15:59:35 kraxel Exp $
   3  *
   4  * i2c tv tuner chip device driver
   5  * core core, i.e. kernel interfaces, registering and so on
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/moduleparam.h>
  10 #include <linux/kernel.h>
  11 #include <linux/sched.h>
  12 #include <linux/string.h>
  13 #include <linux/timer.h>
  14 #include <linux/delay.h>
  15 #include <linux/errno.h>
  16 #include <linux/slab.h>
  17 #include <linux/poll.h>
  18 #include <linux/i2c.h>
  19 #include <linux/types.h>
  20 #include <linux/videodev.h>
  21 #include <linux/init.h>
  22
  23 #include <media/tuner.h>
  24 #include <media/audiochip.h>
  25
  26 #define UNSET (-1U)
  27
  28 /* standard i2c insmod options */
  29 static unsigned short normal_i2c[] = {
  30         0x4b, /* tda8290 */
  31         I2C_CLIENT_END
  32 };
  33 static unsigned short normal_i2c_range[] = {
  34         0x60, 0x6f,
  35         I2C_CLIENT_END
  36 };
  37 I2C_CLIENT_INSMOD;
  38
  39 /* insmod options used at init time => read/only */
  40 static unsigned int addr  =  0;
  41 module_param(addr, int, 0444);
  42
  43 /* insmod options used at runtime => read/write */
  44 unsigned int tuner_debug   = 0;
  45 module_param(tuner_debug,       int, 0644);
  46
  47 static unsigned int tv_range[2]    = { 44, 958 };
  48 static unsigned int radio_range[2] = { 65, 108 };
  49
  50 module_param_array(tv_range,    int, NULL, 0644);
  51 module_param_array(radio_range, int, NULL, 0644);
  52
  53 MODULE_DESCRIPTION("device driver for various TV and TV+FM radio tuners");
  54 MODULE_AUTHOR("Ralph Metzler, Gerd Knorr, Gunther Mayer");
  55 MODULE_LICENSE("GPL");
  56
  57 static int this_adap;
  58
  59 static struct i2c_driver driver;
  60 static struct i2c_client client_template;
  61
  62 /* ---------------------------------------------------------------------- */
  63
  64 // Set tuner frequency,  freq in Units of 62.5kHz = 1/16MHz
  65 static void set_tv_freq(struct i2c_client *c, unsigned int freq)
  66 {
  67         struct tuner *t = i2c_get_clientdata(c);
  68
  69         if (t->type == UNSET) {
  70                 tuner_info("tuner type not set\n");
  71                 return;
  72         }
  73         if (NULL == t->tv_freq) {
  74                 tuner_info("Huh? tv_set is NULL?\n");
  75                 return;
  76         }
  77         if (freq < tv_range[0]*16 || freq > tv_range[1]*16) {
  78                 /* FIXME: better do that chip-specific, but
  79                    right now we don't have that in the config
  80                    struct and this way is still better than no
  81                    check at all */
  82                 tuner_info("TV freq (%d.%02d) out of range (%d-%d)\n",
  83                            freq/16,freq%16*100/16,tv_range[0],tv_range[1]);
  84                 return;
  85         }
  86         t->tv_freq(c,freq);
  87 }
  88
  89 static void set_radio_freq(struct i2c_client *c, unsigned int freq)
  90 {
  91         struct tuner *t = i2c_get_clientdata(c);
  92
  93         if (t->type == UNSET) {
  94                 tuner_info("tuner type not set\n");
  95                 return;
  96         }
  97         if (NULL == t->radio_freq) {
  98                 tuner_info("no radio tuning for this one, sorry.\n");
  99                 return;
 100         }
 101         if (freq < radio_range[0]*16 || freq > radio_range[1]*16) {
 102                 tuner_info("radio freq (%d.%02d) out of range (%d-%d)\n",
 103                            freq/16,freq%16*100/16,
 104                            radio_range[0],radio_range[1]);
 105                 return;
 106         }
 107         t->radio_freq(c,freq);
 108 }
 109
 110 static void set_freq(struct i2c_client *c, unsigned long freq)
 111 {
 112         struct tuner *t = i2c_get_clientdata(c);
 113
 114         switch (t->mode) {
 115         case V4L2_TUNER_RADIO:
 116                 tuner_dbg("radio freq set to %lu.%02lu\n",
 117                           freq/16,freq%16*100/16);
 118                 set_radio_freq(c,freq);
 119                 break;
 120         case V4L2_TUNER_ANALOG_TV:
 121         case V4L2_TUNER_DIGITAL_TV:
 122                 tuner_dbg("tv freq set to %lu.%02lu\n",
 123                           freq/16,freq%16*100/16);
 124                 set_tv_freq(c, freq);
 125                 break;
 126         }
 127         t->freq = freq;
 128 }
 129
 130 static void set_type(struct i2c_client *c, unsigned int type)
 131 {
 132         struct tuner *t = i2c_get_clientdata(c);
 133
 134         /* sanity check */
 135         if (type == UNSET  ||  type == TUNER_ABSENT)
 136                 return;
 137         if (type >= tuner_count)
 138                 return;
 139
 140         if (NULL == t->i2c.dev.driver) {
 141                 /* not registered yet */
 142                 t->type = type;
 143                 return;
 144         }
 145         if (t->initialized)
 146                 /* run only once */
 147                 return;
 148
 149         t->initialized = 1;
 150         t->type = type;
 151         switch (t->type) {
 152         case TUNER_MT2032:
 153                 microtune_init(c);
 154                 break;
 155         case TUNER_PHILIPS_TDA8290:
 156                 tda8290_init(c);
 157                 break;
 158         default:
 159                 default_tuner_init(c);
 160                 break;
 161         }
 162 }
 163
 164 static char pal[] = "-";
 165 module_param_string(pal, pal, 0644, sizeof(pal));
 166
 167 static int tuner_fixup_std(struct tuner *t)
 168 {
 169         if ((t->std & V4L2_STD_PAL) == V4L2_STD_PAL) {
 170                 /* get more precise norm info from insmod option */
 171                 switch (pal[0]) {
 172                 case 'b':
 173                 case 'B':
 174                 case 'g':
 175                 case 'G':
 176                         tuner_dbg("insmod fixup: PAL => PAL-BG\n");
 177                         t->std = V4L2_STD_PAL_BG;
 178                         break;
 179                 case 'i':
 180                 case 'I':
 181                         tuner_dbg("insmod fixup: PAL => PAL-I\n");
 182                         t->std = V4L2_STD_PAL_I;
 183                         break;
 184                 case 'd':
 185                 case 'D':
 186                 case 'k':
 187                 case 'K':
 188                         tuner_dbg("insmod fixup: PAL => PAL-DK\n");
 189                         t->std = V4L2_STD_PAL_DK;
 190                         break;
 191                 }
 192         }
 193         return 0;
 194 }
 195
 196 /* ---------------------------------------------------------------------- */
 197
 198 static int tuner_attach(struct i2c_adapter *adap, int addr, int kind)
 199 {
 200         struct tuner *t;
 201
 202         if (this_adap > 0)
 203                 return -1;
 204         this_adap++;
 205
 206         client_template.adapter = adap;
 207         client_template.addr = addr;
 208
 209         t = kmalloc(sizeof(struct tuner),GFP_KERNEL);
 210         if (NULL == t)
 211                 return -ENOMEM;
 212         memset(t,0,sizeof(struct tuner));
 213         memcpy(&t->i2c,&client_template,sizeof(struct i2c_client));
 214         i2c_set_clientdata(&t->i2c, t);
 215         t->type       = UNSET;
 216         t->radio_if2  = 10700*1000; // 10.7MHz - FM radio
 217
 218         i2c_attach_client(&t->i2c);
 219         tuner_info("chip found @ 0x%x (%s)\n",
 220                    addr << 1, adap->name);
 221         set_type(&t->i2c, t->type);
 222         return 0;
 223 }
 224
 225 static int tuner_probe(struct i2c_adapter *adap)
 226 {
 227         if (0 != addr) {
 228                 normal_i2c[0]       = addr;
 229                 normal_i2c_range[0] = addr;
 230                 normal_i2c_range[1] = addr;
 231         }
 232         this_adap = 0;
 233
 234         if (adap->class & I2C_CLASS_TV_ANALOG)
 235                 return i2c_probe(adap, &addr_data, tuner_attach);
 236         return 0;
 237 }
 238
 239 static int tuner_detach(struct i2c_client *client)
 240 {
 241         struct tuner *t = i2c_get_clientdata(client);
 242
 243         i2c_detach_client(&t->i2c);
 244         kfree(t);
 245         return 0;
 246 }
 247
 248 #define SWITCH_V4L2     if (!t->using_v4l2 && tuner_debug) \
 249                           tuner_info("switching to v4l2\n"); \
 250                           t->using_v4l2 = 1;
 251 #define CHECK_V4L2      if (t->using_v4l2) { if (tuner_debug) \
 252                           tuner_info("ignore v4l1 call\n"); \
 253                           return 0; }
 254
 255 static int
 256 tuner_command(struct i2c_client *client, unsigned int cmd, void *arg)
 257 {
 258         struct tuner *t = i2c_get_clientdata(client);
 259         unsigned int *iarg = (int*)arg;
 260
 261         switch (cmd) {
 262
 263         /* --- configuration --- */
 264         case TUNER_SET_TYPE:
 265                 set_type(client,*iarg);
 266                 break;
 267         case AUDC_SET_RADIO:
 268                 if (V4L2_TUNER_RADIO != t->mode) {
 269                         set_tv_freq(client,400 * 16);
 270                         t->mode = V4L2_TUNER_RADIO;
 271                 }
 272                 break;
 273         case AUDC_CONFIG_PINNACLE:
 274                 switch (*iarg) {
 275                 case 2:
 276                         tuner_dbg("pinnacle pal\n");
 277                         t->radio_if2 = 33300 * 1000;
 278                         break;
 279                 case 3:
 280                         tuner_dbg("pinnacle ntsc\n");
 281                         t->radio_if2 = 41300 * 1000;
 282                         break;
 283                 }
 284                 break;
 285
 286         /* --- v4l ioctls --- */
 287         /* take care: bttv does userspace copying, we'll get a
 288            kernel pointer here... */
 289         case VIDIOCSCHAN:
 290         {
 291                 static const v4l2_std_id map[] = {
 292                         [ VIDEO_MODE_PAL   ] = V4L2_STD_PAL,
 293                         [ VIDEO_MODE_NTSC  ] = V4L2_STD_NTSC_M,
 294                         [ VIDEO_MODE_SECAM ] = V4L2_STD_SECAM,
 295                         [ 4 /* bttv */     ] = V4L2_STD_PAL_M,
 296                         [ 5 /* bttv */     ] = V4L2_STD_PAL_N,
 297                         [ 6 /* bttv */     ] = V4L2_STD_NTSC_M_JP,
 298                 };
 299                 struct video_channel *vc = arg;
 300
 301                 CHECK_V4L2;
 302                 t->mode = V4L2_TUNER_ANALOG_TV;
 303                 if (vc->norm < ARRAY_SIZE(map))
 304                         t->std = map[vc->norm];
 305                 tuner_fixup_std(t);
 306                 if (t->freq)
 307                         set_tv_freq(client,t->freq);
 308                 return 0;
 309         }
 310         case VIDIOCSFREQ:
 311         {
 312                 unsigned long *v = arg;
 313
 314                 CHECK_V4L2;
 315                 set_freq(client,*v);
 316                 return 0;
 317         }
 318         case VIDIOCGTUNER:
 319         {
 320                 struct video_tuner *vt = arg;
 321
 322                 CHECK_V4L2;
 323                 if (V4L2_TUNER_RADIO == t->mode  &&  t->has_signal)
 324                         vt->signal = t->has_signal(client);
 325                 return 0;
 326         }
 327         case VIDIOCGAUDIO:
 328         {
 329                 struct video_audio *va = arg;
 330
 331                 CHECK_V4L2;
 332                 if (V4L2_TUNER_RADIO == t->mode  &&  t->is_stereo)
 333                         va->mode = t->is_stereo(client)
 334                                 ? VIDEO_SOUND_STEREO
 335                                 : VIDEO_SOUND_MONO;
 336                 return 0;
 337         }
 338
 339         case VIDIOC_S_STD:
 340         {
 341                 v4l2_std_id *id = arg;
 342
 343                 SWITCH_V4L2;
 344                 t->mode = V4L2_TUNER_ANALOG_TV;
 345                 t->std = *id;
 346                 tuner_fixup_std(t);
 347                 if (t->freq)
 348                         set_freq(client,t->freq);
 349                 break;
 350         }
 351         case VIDIOC_S_FREQUENCY:
 352         {
 353                 struct v4l2_frequency *f = arg;
 354
 355                 SWITCH_V4L2;
 356                 if (V4L2_TUNER_RADIO == f->type &&
 357                     V4L2_TUNER_RADIO != t->mode)
 358                         set_tv_freq(client,400*16);
 359                 t->mode  = f->type;
 360                 t->freq  = f->frequency;
 361                 set_freq(client,t->freq);
 362                 break;
 363         }
 364         case VIDIOC_G_TUNER:
 365         {
 366                 struct v4l2_tuner *tuner = arg;
 367
 368                 SWITCH_V4L2;
 369                 if (V4L2_TUNER_RADIO == t->mode  &&  t->has_signal)
 370                         tuner->signal = t->has_signal(client);
 371                 break;
 372         }
 373         default:
 374                 /* nothing */
 375                 break;
 376         }
 377
 378         return 0;
 379 }
 380
 381 static int tuner_suspend(struct device * dev, u32 state, u32 level)
 382 {
 383         struct i2c_client *c = container_of(dev, struct i2c_client, dev);
 384         struct tuner *t = i2c_get_clientdata(c);
 385
 386         tuner_dbg("suspend\n");
 387         /* FIXME: power down ??? */
 388         return 0;
 389 }
 390
 391 static int tuner_resume(struct device * dev, u32 level)
 392 {
 393         struct i2c_client *c = container_of(dev, struct i2c_client, dev);
 394         struct tuner *t = i2c_get_clientdata(c);
 395
 396         tuner_dbg("resume\n");
 397         if (t->freq)
 398                 set_freq(c,t->freq);
 399         return 0;
 400 }
 401
 402 /* ----------------------------------------------------------------------- */
 403
 404 static struct i2c_driver driver = {
 405         .owner          = THIS_MODULE,
 406         .name           = "tuner",
 407         .id             = I2C_DRIVERID_TUNER,
 408         .flags          = I2C_DF_NOTIFY,
 409         .attach_adapter = tuner_probe,
 410         .detach_client  = tuner_detach,
 411         .command        = tuner_command,
 412         .driver = {
 413                 .suspend = tuner_suspend,
 414                 .resume  = tuner_resume,
 415         },
 416 };
 417 static struct i2c_client client_template =
 418 {
 419         I2C_DEVNAME("(tuner unset)"),
 420         .flags      = I2C_CLIENT_ALLOW_USE,
 421         .driver     = &driver,
 422 };
 423
 424 static int __init tuner_init_module(void)
 425 {
 426         return i2c_add_driver(&driver);
 427 }
 428
 429 static void __exit tuner_cleanup_module(void)
 430 {
 431         i2c_del_driver(&driver);
 432 }
 433
 434 module_init(tuner_init_module);
 435 module_exit(tuner_cleanup_module);
 436
 437 /*
 438  * Overrides for Emacs so that we follow Linus's tabbing style.
 439  * ---------------------------------------------------------------------------
 440  * Local variables:
 441  * c-basic-offset: 8
 442  * End:
 443  */