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  *     Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  38  *
  39  ***************************************************************************
  40  */
  41
  42 #include <linux/types.h>
  43 #include <linux/list.h>
  44 #include <linux/module.h>
  45 #include <linux/init.h>
  46 #include <linux/pci.h>
  47 #include <linux/videodev2.h>
  48 #include <media/v4l2-common.h>
  49 #include <media/v4l2-ioctl.h>
  50 #include <linux/errno.h>
  51
  52 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  53 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  54
  55 static struct v4l2_queryctrl radio_qctrl[] = {
  56         {
  57                 .id            = V4L2_CID_AUDIO_MUTE,
  58                 .name          = "Mute",
  59                 .minimum       = 0,
  60                 .maximum       = 1,
  61                 .default_value = 1,
  62                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  63         },{
  64                 .id            = V4L2_CID_AUDIO_VOLUME,
  65                 .name          = "Volume",
  66                 .minimum       = 0,
  67                 .maximum       = 65535,
  68                 .step          = 65535,
  69                 .default_value = 0xff,
  70                 .type          = V4L2_CTRL_TYPE_INTEGER,
  71         }
  72 };
  73
  74 #include <asm/io.h>
  75 #include <asm/uaccess.h>
  76
  77 #ifndef PCI_VENDOR_ID_GEMTEK
  78 #define PCI_VENDOR_ID_GEMTEK 0x5046
  79 #endif
  80
  81 #ifndef PCI_DEVICE_ID_GEMTEK_PR103
  82 #define PCI_DEVICE_ID_GEMTEK_PR103 0x1001
  83 #endif
  84
  85 #ifndef GEMTEK_PCI_RANGE_LOW
  86 #define GEMTEK_PCI_RANGE_LOW (87*16000)
  87 #endif
  88
  89 #ifndef GEMTEK_PCI_RANGE_HIGH
  90 #define GEMTEK_PCI_RANGE_HIGH (108*16000)
  91 #endif
  92
  93 struct gemtek_pci_card {
  94         struct video_device *videodev;
  95
  96         u32 iobase;
  97         u32 length;
  98
  99         u32 current_frequency;
 100         u8  mute;
 101 };
 102
 103 static int nr_radio = -1;
 104 static unsigned long in_use;
 105
 106 static inline u8 gemtek_pci_out( u16 value, u32 port )
 107 {
 108         outw( value, port );
 109
 110         return (u8)value;
 111 }
 112
 113 #define _b0( v ) *((u8 *)&v)
 114 static void __gemtek_pci_cmd( u16 value, u32 port, u8 *last_byte, int keep )
 115 {
 116         register u8 byte = *last_byte;
 117
 118         if ( !value ) {
 119                 if ( !keep )
 120                         value = (u16)port;
 121                 byte &= 0xfd;
 122         } else
 123                 byte |= 2;
 124
 125         _b0( value ) = byte;
 126         outw( value, port );
 127         byte |= 1;
 128         _b0( value ) = byte;
 129         outw( value, port );
 130         byte &= 0xfe;
 131         _b0( value ) = byte;
 132         outw( value, port );
 133
 134         *last_byte = byte;
 135 }
 136
 137 static inline void gemtek_pci_nil( u32 port, u8 *last_byte )
 138 {
 139         __gemtek_pci_cmd( 0x00, port, last_byte, false );
 140 }
 141
 142 static inline void gemtek_pci_cmd( u16 cmd, u32 port, u8 *last_byte )
 143 {
 144         __gemtek_pci_cmd( cmd, port, last_byte, true );
 145 }
 146
 147 static void gemtek_pci_setfrequency( struct gemtek_pci_card *card, unsigned long frequency )
 148 {
 149         register int i;
 150         register u32 value = frequency / 200 + 856;
 151         register u16 mask = 0x8000;
 152         u8 last_byte;
 153         u32 port = card->iobase;
 154
 155         last_byte = gemtek_pci_out( 0x06, port );
 156
 157         i = 0;
 158         do {
 159                 gemtek_pci_nil( port, &last_byte );
 160                 i++;
 161         } while ( i < 9 );
 162
 163         i = 0;
 164         do {
 165                 gemtek_pci_cmd( value & mask, port, &last_byte );
 166                 mask >>= 1;
 167                 i++;
 168         } while ( i < 16 );
 169
 170         outw( 0x10, port );
 171 }
 172
 173
 174 static inline void gemtek_pci_mute( struct gemtek_pci_card *card )
 175 {
 176         outb( 0x1f, card->iobase );
 177         card->mute = true;
 178 }
 179
 180 static inline void gemtek_pci_unmute( struct gemtek_pci_card *card )
 181 {
 182         if ( card->mute ) {
 183                 gemtek_pci_setfrequency( card, card->current_frequency );
 184                 card->mute = false;
 185         }
 186 }
 187
 188 static inline unsigned int gemtek_pci_getsignal( struct gemtek_pci_card *card )
 189 {
 190         return ( inb( card->iobase ) & 0x08 ) ? 0 : 1;
 191 }
 192
 193 static int vidioc_querycap(struct file *file, void *priv,
 194                                         struct v4l2_capability *v)
 195 {
 196         strlcpy(v->driver, "radio-gemtek-pci", sizeof(v->driver));
 197         strlcpy(v->card, "GemTek PCI Radio", sizeof(v->card));
 198         sprintf(v->bus_info, "ISA");
 199         v->version = RADIO_VERSION;
 200         v->capabilities = V4L2_CAP_TUNER;
 201         return 0;
 202 }
 203
 204 static int vidioc_g_tuner(struct file *file, void *priv,
 205                                         struct v4l2_tuner *v)
 206 {
 207         struct gemtek_pci_card *card = video_drvdata(file);
 208
 209         if (v->index > 0)
 210                 return -EINVAL;
 211
 212         strcpy(v->name, "FM");
 213         v->type = V4L2_TUNER_RADIO;
 214         v->rangelow = GEMTEK_PCI_RANGE_LOW;
 215         v->rangehigh = GEMTEK_PCI_RANGE_HIGH;
 216         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 217         v->capability = V4L2_TUNER_CAP_LOW;
 218         v->audmode = V4L2_TUNER_MODE_MONO;
 219         v->signal = 0xffff * gemtek_pci_getsignal(card);
 220         return 0;
 221 }
 222
 223 static int vidioc_s_tuner(struct file *file, void *priv,
 224                                         struct v4l2_tuner *v)
 225 {
 226         if (v->index > 0)
 227                 return -EINVAL;
 228         return 0;
 229 }
 230
 231 static int vidioc_s_frequency(struct file *file, void *priv,
 232                                         struct v4l2_frequency *f)
 233 {
 234         struct gemtek_pci_card *card = video_drvdata(file);
 235
 236         if ( (f->frequency < GEMTEK_PCI_RANGE_LOW) ||
 237                         (f->frequency > GEMTEK_PCI_RANGE_HIGH) )
 238                 return -EINVAL;
 239         gemtek_pci_setfrequency(card, f->frequency);
 240         card->current_frequency = f->frequency;
 241         card->mute = false;
 242         return 0;
 243 }
 244
 245 static int vidioc_g_frequency(struct file *file, void *priv,
 246                                         struct v4l2_frequency *f)
 247 {
 248         struct gemtek_pci_card *card = video_drvdata(file);
 249
 250         f->type = V4L2_TUNER_RADIO;
 251         f->frequency = card->current_frequency;
 252         return 0;
 253 }
 254
 255 static int vidioc_queryctrl(struct file *file, void *priv,
 256                                         struct v4l2_queryctrl *qc)
 257 {
 258         int i;
 259         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 260                 if (qc->id && qc->id == radio_qctrl[i].id) {
 261                         memcpy(qc, &(radio_qctrl[i]),
 262                                                 sizeof(*qc));
 263                         return 0;
 264                 }
 265         }
 266         return -EINVAL;
 267 }
 268
 269 static int vidioc_g_ctrl(struct file *file, void *priv,
 270                                         struct v4l2_control *ctrl)
 271 {
 272         struct gemtek_pci_card *card = video_drvdata(file);
 273
 274         switch (ctrl->id) {
 275         case V4L2_CID_AUDIO_MUTE:
 276                 ctrl->value = card->mute;
 277                 return 0;
 278         case V4L2_CID_AUDIO_VOLUME:
 279                 if (card->mute)
 280                         ctrl->value = 0;
 281                 else
 282                         ctrl->value = 65535;
 283                 return 0;
 284         }
 285         return -EINVAL;
 286 }
 287
 288 static int vidioc_s_ctrl(struct file *file, void *priv,
 289                                         struct v4l2_control *ctrl)
 290 {
 291         struct gemtek_pci_card *card = video_drvdata(file);
 292
 293         switch (ctrl->id) {
 294         case V4L2_CID_AUDIO_MUTE:
 295                 if (ctrl->value)
 296                         gemtek_pci_mute(card);
 297                 else
 298                         gemtek_pci_unmute(card);
 299                 return 0;
 300         case V4L2_CID_AUDIO_VOLUME:
 301                 if (ctrl->value)
 302                         gemtek_pci_unmute(card);
 303                 else
 304                         gemtek_pci_mute(card);
 305                 return 0;
 306         }
 307         return -EINVAL;
 308 }
 309
 310 static int vidioc_g_audio(struct file *file, void *priv,
 311                                         struct v4l2_audio *a)
 312 {
 313         if (a->index > 1)
 314                 return -EINVAL;
 315
 316         strcpy(a->name, "Radio");
 317         a->capability = V4L2_AUDCAP_STEREO;
 318         return 0;
 319 }
 320
 321 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 322 {
 323         *i = 0;
 324         return 0;
 325 }
 326
 327 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 328 {
 329         if (i != 0)
 330                 return -EINVAL;
 331         return 0;
 332 }
 333
 334 static int vidioc_s_audio(struct file *file, void *priv,
 335                                         struct v4l2_audio *a)
 336 {
 337         if (a->index != 0)
 338                 return -EINVAL;
 339         return 0;
 340 }
 341
 342 enum {
 343         GEMTEK_PR103
 344 };
 345
 346 static char *card_names[] __devinitdata = {
 347         "GEMTEK_PR103"
 348 };
 349
 350 static struct pci_device_id gemtek_pci_id[] =
 351 {
 352         { PCI_VENDOR_ID_GEMTEK, PCI_DEVICE_ID_GEMTEK_PR103,
 353           PCI_ANY_ID, PCI_ANY_ID, 0, 0, GEMTEK_PR103 },
 354         { 0 }
 355 };
 356
 357 MODULE_DEVICE_TABLE( pci, gemtek_pci_id );
 358
 359 static int mx = 1;
 360
 361 static int gemtek_pci_exclusive_open(struct file *file)
 362 {
 363         return test_and_set_bit(0, &in_use) ? -EBUSY : 0;
 364 }
 365
 366 static int gemtek_pci_exclusive_release(struct file *file)
 367 {
 368         clear_bit(0, &in_use);
 369         return 0;
 370 }
 371
 372 static const struct v4l2_file_operations gemtek_pci_fops = {
 373         .owner          = THIS_MODULE,
 374         .open           = gemtek_pci_exclusive_open,
 375         .release        = gemtek_pci_exclusive_release,
 376         .ioctl          = video_ioctl2,
 377 };
 378
 379 static const struct v4l2_ioctl_ops gemtek_pci_ioctl_ops = {
 380         .vidioc_querycap    = vidioc_querycap,
 381         .vidioc_g_tuner     = vidioc_g_tuner,
 382         .vidioc_s_tuner     = vidioc_s_tuner,
 383         .vidioc_g_audio     = vidioc_g_audio,
 384         .vidioc_s_audio     = vidioc_s_audio,
 385         .vidioc_g_input     = vidioc_g_input,
 386         .vidioc_s_input     = vidioc_s_input,
 387         .vidioc_g_frequency = vidioc_g_frequency,
 388         .vidioc_s_frequency = vidioc_s_frequency,
 389         .vidioc_queryctrl   = vidioc_queryctrl,
 390         .vidioc_g_ctrl      = vidioc_g_ctrl,
 391         .vidioc_s_ctrl      = vidioc_s_ctrl,
 392 };
 393
 394 static struct video_device vdev_template = {
 395         .name           = "Gemtek PCI Radio",
 396         .fops           = &gemtek_pci_fops,
 397         .ioctl_ops      = &gemtek_pci_ioctl_ops,
 398         .release        = video_device_release_empty,
 399 };
 400
 401 static int __devinit gemtek_pci_probe( struct pci_dev *pci_dev, const struct pci_device_id *pci_id )
 402 {
 403         struct gemtek_pci_card *card;
 404         struct video_device *devradio;
 405
 406         if ( (card = kzalloc( sizeof( struct gemtek_pci_card ), GFP_KERNEL )) == NULL ) {
 407                 printk( KERN_ERR "gemtek_pci: out of memory\n" );
 408                 return -ENOMEM;
 409         }
 410
 411         if ( pci_enable_device( pci_dev ) )
 412                 goto err_pci;
 413
 414         card->iobase = pci_resource_start( pci_dev, 0 );
 415         card->length = pci_resource_len( pci_dev, 0 );
 416
 417         if ( request_region( card->iobase, card->length, card_names[pci_id->driver_data] ) == NULL ) {
 418                 printk( KERN_ERR "gemtek_pci: i/o port already in use\n" );
 419                 goto err_pci;
 420         }
 421
 422         pci_set_drvdata( pci_dev, card );
 423
 424         if ( (devradio = kmalloc( sizeof( struct video_device ), GFP_KERNEL )) == NULL ) {
 425                 printk( KERN_ERR "gemtek_pci: out of memory\n" );
 426                 goto err_video;
 427         }
 428         *devradio = vdev_template;
 429
 430         if (video_register_device(devradio, VFL_TYPE_RADIO, nr_radio) < 0) {
 431                 kfree( devradio );
 432                 goto err_video;
 433         }
 434
 435         card->videodev = devradio;
 436         video_set_drvdata(devradio, card);
 437         gemtek_pci_mute( card );
 438
 439         printk( KERN_INFO "Gemtek PCI Radio (rev. %d) found at 0x%04x-0x%04x.\n",
 440                 pci_dev->revision, card->iobase, card->iobase + card->length - 1 );
 441
 442         return 0;
 443
 444 err_video:
 445         release_region( card->iobase, card->length );
 446
 447 err_pci:
 448         kfree( card );
 449         return -ENODEV;
 450 }
 451
 452 static void __devexit gemtek_pci_remove( struct pci_dev *pci_dev )
 453 {
 454         struct gemtek_pci_card *card = pci_get_drvdata( pci_dev );
 455
 456         video_unregister_device( card->videodev );
 457         kfree( card->videodev );
 458
 459         release_region( card->iobase, card->length );
 460
 461         if ( mx )
 462                 gemtek_pci_mute( card );
 463
 464         kfree( card );
 465
 466         pci_set_drvdata( pci_dev, NULL );
 467 }
 468
 469 static struct pci_driver gemtek_pci_driver =
 470 {
 471         .name           = "gemtek_pci",
 472         .id_table       = gemtek_pci_id,
 473         .probe          = gemtek_pci_probe,
 474         .remove         = __devexit_p(gemtek_pci_remove),
 475 };
 476
 477 static int __init gemtek_pci_init_module( void )
 478 {
 479         return pci_register_driver( &gemtek_pci_driver );
 480 }
 481
 482 static void __exit gemtek_pci_cleanup_module( void )
 483 {
 484         pci_unregister_driver(&gemtek_pci_driver);
 485 }
 486
 487 MODULE_AUTHOR( "Vladimir Shebordaev <vshebordaev@mail.ru>" );
 488 MODULE_DESCRIPTION( "The video4linux driver for the Gemtek PCI Radio Card" );
 489 MODULE_LICENSE("GPL");
 490
 491 module_param(mx, bool, 0);
 492 MODULE_PARM_DESC( mx, "single digit: 1 - turn off the turner upon module exit (default), 0 - do not" );
 493 module_param(nr_radio, int, 0);
 494 MODULE_PARM_DESC( nr_radio, "video4linux device number to use");
 495
 496 module_init( gemtek_pci_init_module );
 497 module_exit( gemtek_pci_cleanup_module );
 498