drivers/media/radio/radio-maxiradio.c

   1 /*
   2  * Guillemot Maxi Radio FM 2000 PCI radio card driver for Linux
   3  * (C) 2001 Dimitromanolakis Apostolos <apdim@grecian.net>
   4  *
   5  * Based in the radio Maestro PCI driver. Actually it uses the same chip
   6  * for radio but different pci controller.
   7  *
   8  * I didn't have any specs I reversed engineered the protocol from
   9  * the windows driver (radio.dll).
  10  *
  11  * The card uses the TEA5757 chip that includes a search function but it
  12  * is useless as I haven't found any way to read back the frequency. If
  13  * anybody does please mail me.
  14  *
  15  * For the pdf file see:
  16  * http://www.semiconductors.philips.com/pip/TEA5757H/V1
  17  *
  18  *
  19  * CHANGES:
  20  *   0.75b
  21  *     - better pci interface thanks to Francois Romieu <romieu@cogenit.fr>
  22  *
  23  *   0.75      Sun Feb  4 22:51:27 EET 2001
  24  *     - tiding up
  25  *     - removed support for multiple devices as it didn't work anyway
  26  *
  27  * BUGS:
  28  *   - card unmutes if you change frequency
  29  *
  30  * (c) 2006, 2007 by Mauro Carvalho Chehab <mchehab@infradead.org>:
  31  *      - Conversion to V4L2 API
  32  *      - Uses video_ioctl2 for parsing and to add debug support
  33  */
  34
  35
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/ioport.h>
  39 #include <linux/delay.h>
  40 #include <asm/io.h>
  41 #include <asm/uaccess.h>
  42 #include <linux/mutex.h>
  43
  44 #include <linux/pci.h>
  45 #include <linux/videodev2.h>
  46 #include <media/v4l2-common.h>
  47
  48 #define DRIVER_VERSION  "0.77"
  49
  50 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  51 #define RADIO_VERSION KERNEL_VERSION(0,7,7)
  52
  53 static struct video_device maxiradio_radio;
  54
  55 #define dprintk(num, fmt, arg...)                                          \
  56         do {                                                               \
  57                 if (maxiradio_radio.debug >= num)                          \
  58                         printk(KERN_DEBUG "%s: " fmt,                      \
  59                                 maxiradio_radio.name, ## arg); } while (0)
  60
  61 static struct v4l2_queryctrl radio_qctrl[] = {
  62         {
  63                 .id            = V4L2_CID_AUDIO_MUTE,
  64                 .name          = "Mute",
  65                 .minimum       = 0,
  66                 .maximum       = 1,
  67                 .default_value = 1,
  68                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  69         }
  70 };
  71
  72 #ifndef PCI_VENDOR_ID_GUILLEMOT
  73 #define PCI_VENDOR_ID_GUILLEMOT 0x5046
  74 #endif
  75
  76 #ifndef PCI_DEVICE_ID_GUILLEMOT
  77 #define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
  78 #endif
  79
  80
  81 /* TEA5757 pin mappings */
  82 static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;
  83
  84 static int radio_nr = -1;
  85 module_param(radio_nr, int, 0);
  86
  87
  88 #define FREQ_LO          50*16000
  89 #define FREQ_HI         150*16000
  90
  91 #define FREQ_IF         171200 /* 10.7*16000   */
  92 #define FREQ_STEP       200    /* 12.5*16      */
  93
  94 /* (x==fmhz*16*1000) -> bits */
  95 #define FREQ2BITS(x)    ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1)) \
  96                         /(FREQ_STEP<<2))<<2)
  97
  98 #define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)
  99
 100
 101 static const struct file_operations maxiradio_fops = {
 102         .owner          = THIS_MODULE,
 103         .open           = video_exclusive_open,
 104         .release        = video_exclusive_release,
 105         .ioctl          = video_ioctl2,
 106         .compat_ioctl   = v4l_compat_ioctl32,
 107         .llseek         = no_llseek,
 108 };
 109
 110 static struct radio_device
 111 {
 112         __u16   io,     /* base of radio io */
 113                 muted,  /* VIDEO_AUDIO_MUTE */
 114                 stereo, /* VIDEO_TUNER_STEREO_ON */
 115                 tuned;  /* signal strength (0 or 0xffff) */
 116
 117         unsigned long freq;
 118
 119         struct mutex lock;
 120 } radio_unit = {
 121         .muted =1,
 122         .freq = FREQ_LO,
 123 };
 124
 125 static void outbit(unsigned long bit, __u16 io)
 126 {
 127         if (bit != 0)
 128                 {
 129                         outb(  power|wren|data     ,io); udelay(4);
 130                         outb(  power|wren|data|clk ,io); udelay(4);
 131                         outb(  power|wren|data     ,io); udelay(4);
 132                 }
 133         else
 134                 {
 135                         outb(  power|wren          ,io); udelay(4);
 136                         outb(  power|wren|clk      ,io); udelay(4);
 137                         outb(  power|wren          ,io); udelay(4);
 138                 }
 139 }
 140
 141 static void turn_power(__u16 io, int p)
 142 {
 143         if (p != 0) {
 144                 dprintk(1, "Radio powered on\n");
 145                 outb(power, io);
 146         } else {
 147                 dprintk(1, "Radio powered off\n");
 148                 outb(0,io);
 149         }
 150 }
 151
 152 static void set_freq(__u16 io, __u32 freq)
 153 {
 154         unsigned long int si;
 155         int bl;
 156         int data = FREQ2BITS(freq);
 157
 158         /* TEA5757 shift register bits (see pdf) */
 159
 160         outbit(0,io); // 24  search
 161         outbit(1,io); // 23  search up/down
 162
 163         outbit(0,io); // 22  stereo/mono
 164
 165         outbit(0,io); // 21  band
 166         outbit(0,io); // 20  band (only 00=FM works I think)
 167
 168         outbit(0,io); // 19  port ?
 169         outbit(0,io); // 18  port ?
 170
 171         outbit(0,io); // 17  search level
 172         outbit(0,io); // 16  search level
 173
 174         si = 0x8000;
 175         for (bl = 1; bl <= 16 ; bl++) {
 176                 outbit(data & si,io);
 177                 si >>=1;
 178         }
 179
 180         dprintk(1, "Radio freq set to %d.%02d MHz\n",
 181                                 freq / 16000,
 182                                 freq % 16000 * 100 / 16000);
 183
 184         turn_power(io, 1);
 185 }
 186
 187 static int get_stereo(__u16 io)
 188 {
 189         outb(power,io);
 190         udelay(4);
 191
 192         return !(inb(io) & mo_st);
 193 }
 194
 195 static int get_tune(__u16 io)
 196 {
 197         outb(power+clk,io);
 198         udelay(4);
 199
 200         return !(inb(io) & mo_st);
 201 }
 202
 203
 204 static int vidioc_querycap (struct file *file, void  *priv,
 205                             struct v4l2_capability *v)
 206 {
 207         strlcpy(v->driver, "radio-maxiradio", sizeof (v->driver));
 208         strlcpy(v->card, "Maxi Radio FM2000 radio", sizeof (v->card));
 209         sprintf(v->bus_info,"ISA");
 210         v->version = RADIO_VERSION;
 211         v->capabilities = V4L2_CAP_TUNER;
 212
 213         return 0;
 214 }
 215
 216 static int vidioc_g_tuner (struct file *file, void *priv,
 217                            struct v4l2_tuner *v)
 218 {
 219         struct video_device *dev = video_devdata(file);
 220         struct radio_device *card=dev->priv;
 221
 222         if (v->index > 0)
 223                 return -EINVAL;
 224
 225         memset(v,0,sizeof(*v));
 226         strcpy(v->name, "FM");
 227         v->type = V4L2_TUNER_RADIO;
 228
 229         v->rangelow=FREQ_LO;
 230         v->rangehigh=FREQ_HI;
 231         v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
 232         v->capability=V4L2_TUNER_CAP_LOW;
 233         if(get_stereo(card->io))
 234                 v->audmode = V4L2_TUNER_MODE_STEREO;
 235         else
 236                 v->audmode = V4L2_TUNER_MODE_MONO;
 237         v->signal=0xffff*get_tune(card->io);
 238
 239         return 0;
 240 }
 241
 242 static int vidioc_s_tuner (struct file *file, void *priv,
 243                            struct v4l2_tuner *v)
 244 {
 245         if (v->index > 0)
 246                 return -EINVAL;
 247
 248         return 0;
 249 }
 250
 251 static int vidioc_g_audio (struct file *file, void *priv,
 252                            struct v4l2_audio *a)
 253 {
 254         if (a->index > 1)
 255                 return -EINVAL;
 256
 257         strcpy(a->name, "FM");
 258         a->capability = V4L2_AUDCAP_STEREO;
 259         return 0;
 260 }
 261
 262 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 263 {
 264         *i = 0;
 265
 266         return 0;
 267 }
 268
 269 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 270 {
 271         if (i != 0)
 272                 return -EINVAL;
 273
 274         return 0;
 275 }
 276
 277
 278 static int vidioc_s_audio (struct file *file, void *priv,
 279                            struct v4l2_audio *a)
 280 {
 281         if (a->index != 0)
 282                 return -EINVAL;
 283
 284         return 0;
 285 }
 286
 287 static int vidioc_s_frequency (struct file *file, void *priv,
 288                                struct v4l2_frequency *f)
 289 {
 290         struct video_device *dev = video_devdata(file);
 291         struct radio_device *card=dev->priv;
 292
 293         if (f->frequency < FREQ_LO || f->frequency > FREQ_HI) {
 294                 dprintk(1, "radio freq (%d.%02d MHz) out of range (%d-%d)\n",
 295                                         f->frequency / 16000,
 296                                         f->frequency % 16000 * 100 / 16000,
 297                                         FREQ_LO / 16000, FREQ_HI / 16000);
 298
 299                 return -EINVAL;
 300         }
 301
 302         card->freq = f->frequency;
 303         set_freq(card->io, card->freq);
 304         msleep(125);
 305
 306         return 0;
 307 }
 308
 309 static int vidioc_g_frequency (struct file *file, void *priv,
 310                                struct v4l2_frequency *f)
 311 {
 312         struct video_device *dev = video_devdata(file);
 313         struct radio_device *card=dev->priv;
 314
 315         f->type = V4L2_TUNER_RADIO;
 316         f->frequency = card->freq;
 317
 318         dprintk(4, "radio freq is %d.%02d MHz",
 319                                 f->frequency / 16000,
 320                                 f->frequency % 16000 * 100 / 16000);
 321
 322         return 0;
 323 }
 324
 325 static int vidioc_queryctrl (struct file *file, void *priv,
 326                              struct v4l2_queryctrl *qc)
 327 {
 328         int i;
 329
 330         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 331                 if (qc->id && qc->id == radio_qctrl[i].id) {
 332                         memcpy(qc, &(radio_qctrl[i]), sizeof(*qc));
 333                         return (0);
 334                 }
 335         }
 336
 337         return -EINVAL;
 338 }
 339
 340 static int vidioc_g_ctrl (struct file *file, void *priv,
 341                             struct v4l2_control *ctrl)
 342 {
 343         struct video_device *dev = video_devdata(file);
 344         struct radio_device *card=dev->priv;
 345
 346         switch (ctrl->id) {
 347                 case V4L2_CID_AUDIO_MUTE:
 348                         ctrl->value=card->muted;
 349                         return (0);
 350         }
 351
 352         return -EINVAL;
 353 }
 354
 355 static int vidioc_s_ctrl (struct file *file, void *priv,
 356                           struct v4l2_control *ctrl)
 357 {
 358         struct video_device *dev = video_devdata(file);
 359         struct radio_device *card=dev->priv;
 360
 361         switch (ctrl->id) {
 362                 case V4L2_CID_AUDIO_MUTE:
 363                         card->muted = ctrl->value;
 364                         if(card->muted)
 365                                 turn_power(card->io, 0);
 366                         else
 367                                 set_freq(card->io, card->freq);
 368                         return 0;
 369         }
 370
 371         return -EINVAL;
 372 }
 373
 374 static struct video_device maxiradio_radio =
 375 {
 376         .owner              = THIS_MODULE,
 377         .name               = "Maxi Radio FM2000 radio",
 378         .type               = VID_TYPE_TUNER,
 379         .fops               = &maxiradio_fops,
 380
 381         .vidioc_querycap    = vidioc_querycap,
 382         .vidioc_g_tuner     = vidioc_g_tuner,
 383         .vidioc_s_tuner     = vidioc_s_tuner,
 384         .vidioc_g_audio     = vidioc_g_audio,
 385         .vidioc_s_audio     = vidioc_s_audio,
 386         .vidioc_g_input     = vidioc_g_input,
 387         .vidioc_s_input     = vidioc_s_input,
 388         .vidioc_g_frequency = vidioc_g_frequency,
 389         .vidioc_s_frequency = vidioc_s_frequency,
 390         .vidioc_queryctrl   = vidioc_queryctrl,
 391         .vidioc_g_ctrl      = vidioc_g_ctrl,
 392         .vidioc_s_ctrl      = vidioc_s_ctrl,
 393 };
 394
 395 static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 396 {
 397         if(!request_region(pci_resource_start(pdev, 0),
 398                            pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 399                 printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
 400                 goto err_out;
 401         }
 402
 403         if (pci_enable_device(pdev))
 404                 goto err_out_free_region;
 405
 406         radio_unit.io = pci_resource_start(pdev, 0);
 407         mutex_init(&radio_unit.lock);
 408         maxiradio_radio.priv = &radio_unit;
 409
 410         if (video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
 411                 printk("radio-maxiradio: can't register device!");
 412                 goto err_out_free_region;
 413         }
 414
 415         printk(KERN_INFO "radio-maxiradio: version "
 416                DRIVER_VERSION
 417                " time "
 418                __TIME__ "  "
 419                __DATE__
 420                "\n");
 421
 422         printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
 423                radio_unit.io);
 424         return 0;
 425
 426 err_out_free_region:
 427         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 428 err_out:
 429         return -ENODEV;
 430 }
 431
 432 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 433 {
 434         video_unregister_device(&maxiradio_radio);
 435         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 436 }
 437
 438 static struct pci_device_id maxiradio_pci_tbl[] = {
 439         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 440                 PCI_ANY_ID, PCI_ANY_ID, },
 441         { 0,}
 442 };
 443
 444 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 445
 446 static struct pci_driver maxiradio_driver = {
 447         .name           = "radio-maxiradio",
 448         .id_table       = maxiradio_pci_tbl,
 449         .probe          = maxiradio_init_one,
 450         .remove         = __devexit_p(maxiradio_remove_one),
 451 };
 452
 453 static int __init maxiradio_radio_init(void)
 454 {
 455         return pci_register_driver(&maxiradio_driver);
 456 }
 457
 458 static void __exit maxiradio_radio_exit(void)
 459 {
 460         pci_unregister_driver(&maxiradio_driver);
 461 }
 462
 463 module_init(maxiradio_radio_init);
 464 module_exit(maxiradio_radio_exit);
 465
 466 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
 467 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
 468 MODULE_LICENSE("GPL");
 469
 470 module_param_named(debug,maxiradio_radio.debug, int, 0644);
 471 MODULE_PARM_DESC(debug,"activates debug info");