drivers/media/radio/radio-gemtek-pci.c

   1 /*
   2  ***************************************************************************
   3  *
   4  *     radio-gemtek-pci.c - Gemtek PCI Radio driver
   5  *     (C) 2001 Vladimir Shebordaev <vshebordaev@mail.ru>
   6  *
   7  ***************************************************************************
   8  *
   9  *     This program is free software; you can redistribute it and/or
  10  *     modify it under the terms of the GNU General Public License as
  11  *     published by the Free Software Foundation; either version 2 of
  12  *     the License, or (at your option) any later version.
  13  *
  14  *     This program is distributed in the hope that it will be useful,
  15  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *     GNU General Public License for more details.
  18  *
  19  *     You should have received a copy of the GNU General Public
  20  *     License along with this program; if not, write to the Free
  21  *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
  22  *     USA.
  23  *
  24  ***************************************************************************
  25  *
  26  *     Gemtek Corp still silently refuses to release any specifications
  27  *     of their multimedia devices, so the protocol still has to be
  28  *     reverse engineered.
  29  *
  30  *     The v4l code was inspired by Jonas Munsin's  Gemtek serial line
  31  *     radio device driver.
  32  *
  33  *     Please, let me know if this piece of code was useful :)
  34  *
  35  *     TODO: multiple device support and portability were not tested
  36  *
  37  ***************************************************************************
  38  */
  39
  40 #include <linux/config.h>
  41 #include <linux/types.h>
  42 #include <linux/list.h>
  43 #include <linux/module.h>
  44 #include <linux/init.h>
  45 #include <linux/pci.h>
  46 #include <linux/videodev.h>
  47 #include <linux/errno.h>
  48
  49 #include <asm/io.h>
  50 #include <asm/uaccess.h>
  51
  52 #ifndef PCI_VENDOR_ID_GEMTEK
  53 #define PCI_VENDOR_ID_GEMTEK 0x5046
  54 #endif
  55
  56 #ifndef PCI_DEVICE_ID_GEMTEK_PR103
  57 #define PCI_DEVICE_ID_GEMTEK_PR103 0x1001
  58 #endif
  59
  60 #ifndef GEMTEK_PCI_RANGE_LOW
  61 #define GEMTEK_PCI_RANGE_LOW (87*16000)
  62 #endif
  63
  64 #ifndef GEMTEK_PCI_RANGE_HIGH
  65 #define GEMTEK_PCI_RANGE_HIGH (108*16000)
  66 #endif
  67
  68 #ifndef TRUE
  69 #define TRUE (1)
  70 #endif
  71
  72 #ifndef FALSE
  73 #define FALSE (0)
  74 #endif
  75
  76 struct gemtek_pci_card {
  77         struct video_device *videodev;
  78
  79         u32 iobase;
  80         u32 length;
  81         u8  chiprev;
  82         u16 model;
  83
  84         u32 current_frequency;
  85         u8  mute;
  86 };
  87
  88 static const char rcsid[] = "$Id: radio-gemtek-pci.c,v 1.1 2001/07/23 08:08:16 ted Exp ted $";
  89
  90 static int nr_radio = -1;
  91
  92 static inline u8 gemtek_pci_out( u16 value, u32 port )
  93 {
  94         outw( value, port );
  95
  96         return (u8)value;
  97 }
  98
  99 #define _b0( v ) *((u8 *)&v)
 100 static void __gemtek_pci_cmd( u16 value, u32 port, u8 *last_byte, int keep )
 101 {
 102         register u8 byte = *last_byte;
 103
 104         if ( !value ) {
 105                 if ( !keep )
 106                         value = (u16)port;
 107                 byte &= 0xfd;
 108         } else
 109                 byte |= 2;
 110
 111         _b0( value ) = byte;
 112         outw( value, port );
 113         byte |= 1;
 114         _b0( value ) = byte;
 115         outw( value, port );
 116         byte &= 0xfe;
 117         _b0( value ) = byte;
 118         outw( value, port );
 119
 120         *last_byte = byte;
 121 }
 122
 123 static inline void gemtek_pci_nil( u32 port, u8 *last_byte )
 124 {
 125         __gemtek_pci_cmd( 0x00, port, last_byte, FALSE );
 126 }
 127
 128 static inline void gemtek_pci_cmd( u16 cmd, u32 port, u8 *last_byte )
 129 {
 130         __gemtek_pci_cmd( cmd, port, last_byte, TRUE );
 131 }
 132
 133 static void gemtek_pci_setfrequency( struct gemtek_pci_card *card, unsigned long frequency )
 134 {
 135         register int i;
 136         register u32 value = frequency / 200 + 856;
 137         register u16 mask = 0x8000;
 138         u8 last_byte;
 139         u32 port = card->iobase;
 140
 141         last_byte = gemtek_pci_out( 0x06, port );
 142
 143         i = 0;
 144         do {
 145                 gemtek_pci_nil( port, &last_byte );
 146                 i++;
 147         } while ( i < 9 );
 148
 149         i = 0;
 150         do {
 151                 gemtek_pci_cmd( value & mask, port, &last_byte );
 152                 mask >>= 1;
 153                 i++;
 154         } while ( i < 16 );
 155
 156         outw( 0x10, port );
 157 }
 158
 159
 160 static inline void gemtek_pci_mute( struct gemtek_pci_card *card )
 161 {
 162         outb( 0x1f, card->iobase );
 163         card->mute = TRUE;
 164 }
 165
 166 static inline void gemtek_pci_unmute( struct gemtek_pci_card *card )
 167 {
 168         if ( card->mute ) {
 169                 gemtek_pci_setfrequency( card, card->current_frequency );
 170                 card->mute = FALSE;
 171         }
 172 }
 173
 174 static inline unsigned int gemtek_pci_getsignal( struct gemtek_pci_card *card )
 175 {
 176         return ( inb( card->iobase ) & 0x08 ) ? 0 : 1;
 177 }
 178
 179 static int gemtek_pci_do_ioctl(struct inode *inode, struct file *file,
 180                                unsigned int cmd, void *arg)
 181 {
 182         struct video_device *dev = video_devdata(file);
 183         struct gemtek_pci_card *card = dev->priv;
 184
 185         switch ( cmd ) {
 186                 case VIDIOCGCAP:
 187                 {
 188                         struct video_capability *c = arg;
 189
 190                         memset(c,0,sizeof(*c));
 191                         c->type = VID_TYPE_TUNER;
 192                         c->channels = 1;
 193                         c->audios = 1;
 194                         strcpy( c->name, "Gemtek PCI Radio" );
 195                         return 0;
 196                 }
 197
 198                 case VIDIOCGTUNER:
 199                 {
 200                         struct video_tuner *t = arg;
 201
 202                         if ( t->tuner )
 203                                 return -EINVAL;
 204
 205                         t->rangelow = GEMTEK_PCI_RANGE_LOW;
 206                         t->rangehigh = GEMTEK_PCI_RANGE_HIGH;
 207                         t->flags = VIDEO_TUNER_LOW;
 208                         t->mode = VIDEO_MODE_AUTO;
 209                         t->signal = 0xFFFF * gemtek_pci_getsignal( card );
 210                         strcpy( t->name, "FM" );
 211                         return 0;
 212                 }
 213
 214                 case VIDIOCSTUNER:
 215                 {
 216                         struct video_tuner *t = arg;
 217                         if ( t->tuner )
 218                                 return -EINVAL;
 219                         return 0;
 220                 }
 221
 222                 case VIDIOCGFREQ:
 223                 {
 224                         unsigned long *freq = arg;
 225                         *freq = card->current_frequency;
 226                         return 0;
 227                 }
 228                 case VIDIOCSFREQ:
 229                 {
 230                         unsigned long *freq = arg;
 231
 232                         if ( (*freq < GEMTEK_PCI_RANGE_LOW) ||
 233                              (*freq > GEMTEK_PCI_RANGE_HIGH) )
 234                                 return -EINVAL;
 235
 236                         gemtek_pci_setfrequency( card, *freq );
 237                         card->current_frequency = *freq;
 238                         card->mute = FALSE;
 239
 240                         return 0;
 241                 }
 242
 243                 case VIDIOCGAUDIO:
 244                 {
 245                         struct video_audio *a = arg;
 246
 247                         memset( a, 0, sizeof( *a ) );
 248                         a->flags |= VIDEO_AUDIO_MUTABLE;
 249                         a->volume = 1;
 250                         a->step = 65535;
 251                         strcpy( a->name, "Radio" );
 252                         return 0;
 253                 }
 254
 255                 case VIDIOCSAUDIO:
 256                 {
 257                         struct video_audio *a = arg;
 258
 259                         if ( a->audio )
 260                                 return -EINVAL;
 261
 262                         if ( a->flags & VIDEO_AUDIO_MUTE )
 263                                 gemtek_pci_mute( card );
 264                         else
 265                                 gemtek_pci_unmute( card );
 266                         return 0;
 267                 }
 268
 269                 default:
 270                         return -ENOIOCTLCMD;
 271         }
 272 }
 273
 274 static int gemtek_pci_ioctl(struct inode *inode, struct file *file,
 275                             unsigned int cmd, unsigned long arg)
 276 {
 277         return video_usercopy(inode, file, cmd, arg, gemtek_pci_do_ioctl);
 278 }
 279
 280 enum {
 281         GEMTEK_PR103
 282 };
 283
 284 static char *card_names[] __devinitdata = {
 285         "GEMTEK_PR103"
 286 };
 287
 288 static struct pci_device_id gemtek_pci_id[] =
 289 {
 290         { PCI_VENDOR_ID_GEMTEK, PCI_DEVICE_ID_GEMTEK_PR103,
 291           PCI_ANY_ID, PCI_ANY_ID, 0, 0, GEMTEK_PR103 },
 292         { 0 }
 293 };
 294
 295 MODULE_DEVICE_TABLE( pci, gemtek_pci_id );
 296
 297 static int mx = 1;
 298
 299 static struct file_operations gemtek_pci_fops = {
 300         .owner          = THIS_MODULE,
 301         .open           = video_exclusive_open,
 302         .release        = video_exclusive_release,
 303         .ioctl          = gemtek_pci_ioctl,
 304         .llseek         = no_llseek,
 305 };
 306
 307 static struct video_device vdev_template = {
 308         .owner         = THIS_MODULE,
 309         .name          = "Gemtek PCI Radio",
 310         .type          = VID_TYPE_TUNER,
 311         .hardware      = VID_HARDWARE_GEMTEK,
 312         .fops          = &gemtek_pci_fops,
 313 };
 314
 315 static int __devinit gemtek_pci_probe( struct pci_dev *pci_dev, const struct pci_device_id *pci_id )
 316 {
 317         struct gemtek_pci_card *card;
 318         struct video_device *devradio;
 319
 320         if ( (card = kmalloc( sizeof( struct gemtek_pci_card ), GFP_KERNEL )) == NULL ) {
 321                 printk( KERN_ERR "gemtek_pci: out of memory\n" );
 322                 return -ENOMEM;
 323         }
 324         memset( card, 0, sizeof( struct gemtek_pci_card ) );
 325
 326         if ( pci_enable_device( pci_dev ) )
 327                 goto err_pci;
 328
 329         card->iobase = pci_resource_start( pci_dev, 0 );
 330         card->length = pci_resource_len( pci_dev, 0 );
 331
 332         if ( request_region( card->iobase, card->length, card_names[pci_id->driver_data] ) == NULL ) {
 333                 printk( KERN_ERR "gemtek_pci: i/o port already in use\n" );
 334                 goto err_pci;
 335         }
 336
 337         pci_read_config_byte( pci_dev, PCI_REVISION_ID, &card->chiprev );
 338         pci_read_config_word( pci_dev, PCI_SUBSYSTEM_ID, &card->model );
 339
 340         pci_set_drvdata( pci_dev, card );
 341
 342         if ( (devradio = kmalloc( sizeof( struct video_device ), GFP_KERNEL )) == NULL ) {
 343                 printk( KERN_ERR "gemtek_pci: out of memory\n" );
 344                 goto err_video;
 345         }
 346         *devradio = vdev_template;
 347
 348         if ( video_register_device( devradio, VFL_TYPE_RADIO , nr_radio) == -1 ) {
 349                 kfree( devradio );
 350                 goto err_video;
 351         }
 352
 353         card->videodev = devradio;
 354         devradio->priv = card;
 355         gemtek_pci_mute( card );
 356
 357         printk( KERN_INFO "Gemtek PCI Radio (rev. %d) found at 0x%04x-0x%04x.\n",
 358                 card->chiprev, card->iobase, card->iobase + card->length - 1 );
 359
 360         return 0;
 361
 362 err_video:
 363         release_region( card->iobase, card->length );
 364
 365 err_pci:
 366         kfree( card );
 367         return -ENODEV;
 368 }
 369
 370 static void __devexit gemtek_pci_remove( struct pci_dev *pci_dev )
 371 {
 372         struct gemtek_pci_card *card = pci_get_drvdata( pci_dev );
 373
 374         video_unregister_device( card->videodev );
 375         kfree( card->videodev );
 376
 377         release_region( card->iobase, card->length );
 378
 379         if ( mx )
 380                 gemtek_pci_mute( card );
 381
 382         kfree( card );
 383
 384         pci_set_drvdata( pci_dev, NULL );
 385 }
 386
 387 static struct pci_driver gemtek_pci_driver =
 388 {
 389         .name           = "gemtek_pci",
 390         .id_table       = gemtek_pci_id,
 391         .probe          = gemtek_pci_probe,
 392         .remove         = __devexit_p(gemtek_pci_remove),
 393 };
 394
 395 static int __init gemtek_pci_init_module( void )
 396 {
 397         return pci_module_init( &gemtek_pci_driver );
 398 }
 399
 400 static void __exit gemtek_pci_cleanup_module( void )
 401 {
 402         return pci_unregister_driver( &gemtek_pci_driver );
 403 }
 404
 405 MODULE_AUTHOR( "Vladimir Shebordaev <vshebordaev@mail.ru>" );
 406 MODULE_DESCRIPTION( "The video4linux driver for the Gemtek PCI Radio Card" );
 407 MODULE_LICENSE("GPL");
 408
 409 module_param(mx, bool, 0);
 410 MODULE_PARM_DESC( mx, "single digit: 1 - turn off the turner upon module exit (default), 0 - do not" );
 411 module_param(nr_radio, int, 0);
 412 MODULE_PARM_DESC( nr_radio, "video4linux device number to use");
 413
 414 module_init( gemtek_pci_init_module );
 415 module_exit( gemtek_pci_cleanup_module );
 416