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  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  31  */
  32
  33
  34 #include <linux/module.h>
  35 #include <linux/init.h>
  36 #include <linux/ioport.h>
  37 #include <linux/delay.h>
  38 #include <asm/io.h>
  39 #include <asm/uaccess.h>
  40 #include <linux/mutex.h>
  41
  42 #include <linux/pci.h>
  43 #include <linux/videodev2.h>
  44 #include <media/v4l2-common.h>
  45
  46 #define DRIVER_VERSION  "0.76"
  47
  48 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  49 #define RADIO_VERSION KERNEL_VERSION(0,7,6)
  50
  51 static struct v4l2_queryctrl radio_qctrl[] = {
  52         {
  53                 .id            = V4L2_CID_AUDIO_MUTE,
  54                 .name          = "Mute",
  55                 .minimum       = 0,
  56                 .maximum       = 1,
  57                 .default_value = 1,
  58                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  59         }
  60 };
  61
  62 #ifndef PCI_VENDOR_ID_GUILLEMOT
  63 #define PCI_VENDOR_ID_GUILLEMOT 0x5046
  64 #endif
  65
  66 #ifndef PCI_DEVICE_ID_GUILLEMOT
  67 #define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
  68 #endif
  69
  70
  71 /* TEA5757 pin mappings */
  72 static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;
  73
  74 static int radio_nr = -1;
  75 module_param(radio_nr, int, 0);
  76
  77
  78 #define FREQ_LO          50*16000
  79 #define FREQ_HI         150*16000
  80
  81 #define FREQ_IF         171200 /* 10.7*16000   */
  82 #define FREQ_STEP       200    /* 12.5*16      */
  83
  84 #define FREQ2BITS(x)    ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\
  85                         /(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */
  86
  87 #define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)
  88
  89
  90 static int radio_ioctl(struct inode *inode, struct file *file,
  91                        unsigned int cmd, unsigned long arg);
  92
  93 static const struct file_operations maxiradio_fops = {
  94         .owner          = THIS_MODULE,
  95         .open           = video_exclusive_open,
  96         .release        = video_exclusive_release,
  97         .ioctl          = radio_ioctl,
  98         .compat_ioctl   = v4l_compat_ioctl32,
  99         .llseek         = no_llseek,
 100 };
 101 static struct video_device maxiradio_radio =
 102 {
 103         .owner          = THIS_MODULE,
 104         .name           = "Maxi Radio FM2000 radio",
 105         .type           = VID_TYPE_TUNER,
 106         .fops           = &maxiradio_fops,
 107 };
 108
 109 static struct radio_device
 110 {
 111         __u16   io,     /* base of radio io */
 112                 muted,  /* VIDEO_AUDIO_MUTE */
 113                 stereo, /* VIDEO_TUNER_STEREO_ON */
 114                 tuned;  /* signal strength (0 or 0xffff) */
 115
 116         unsigned long freq;
 117
 118         struct mutex lock;
 119 } radio_unit = {0, 0, 0, 0, };
 120
 121
 122 static void outbit(unsigned long bit, __u16 io)
 123 {
 124         if(bit != 0)
 125                 {
 126                         outb(  power|wren|data     ,io); udelay(4);
 127                         outb(  power|wren|data|clk ,io); udelay(4);
 128                         outb(  power|wren|data     ,io); udelay(4);
 129                 }
 130         else
 131                 {
 132                         outb(  power|wren          ,io); udelay(4);
 133                         outb(  power|wren|clk      ,io); udelay(4);
 134                         outb(  power|wren          ,io); udelay(4);
 135                 }
 136 }
 137
 138 static void turn_power(__u16 io, int p)
 139 {
 140         if(p != 0) outb(power, io); else outb(0,io);
 141 }
 142
 143
 144 static void set_freq(__u16 io, __u32 data)
 145 {
 146         unsigned long int si;
 147         int bl;
 148
 149         /* TEA5757 shift register bits (see pdf) */
 150
 151         outbit(0,io); // 24  search
 152         outbit(1,io); // 23  search up/down
 153
 154         outbit(0,io); // 22  stereo/mono
 155
 156         outbit(0,io); // 21  band
 157         outbit(0,io); // 20  band (only 00=FM works I think)
 158
 159         outbit(0,io); // 19  port ?
 160         outbit(0,io); // 18  port ?
 161
 162         outbit(0,io); // 17  search level
 163         outbit(0,io); // 16  search level
 164
 165         si = 0x8000;
 166         for(bl = 1; bl <= 16 ; bl++) { outbit(data & si,io); si >>=1; }
 167
 168         outb(power,io);
 169 }
 170
 171 static int get_stereo(__u16 io)
 172 {
 173         outb(power,io); udelay(4);
 174         return !(inb(io) & mo_st);
 175 }
 176
 177 static int get_tune(__u16 io)
 178 {
 179         outb(power+clk,io); udelay(4);
 180         return !(inb(io) & mo_st);
 181 }
 182
 183
 184 static inline int radio_function(struct inode *inode, struct file *file,
 185                                  unsigned int cmd, void *arg)
 186 {
 187         struct video_device *dev = video_devdata(file);
 188         struct radio_device *card=dev->priv;
 189
 190         switch(cmd) {
 191                 case VIDIOC_QUERYCAP:
 192                 {
 193                         struct v4l2_capability *v = arg;
 194                         memset(v,0,sizeof(*v));
 195                         strlcpy(v->driver, "radio-maxiradio", sizeof (v->driver));
 196                         strlcpy(v->card, "Maxi Radio FM2000 radio", sizeof (v->card));
 197                         sprintf(v->bus_info,"ISA");
 198                         v->version = RADIO_VERSION;
 199                         v->capabilities = V4L2_CAP_TUNER;
 200
 201                         return 0;
 202                 }
 203                 case VIDIOC_G_TUNER:
 204                 {
 205                         struct v4l2_tuner *v = arg;
 206
 207                         if (v->index > 0)
 208                                 return -EINVAL;
 209
 210                         memset(v,0,sizeof(*v));
 211                         strcpy(v->name, "FM");
 212                         v->type = V4L2_TUNER_RADIO;
 213
 214                         v->rangelow=FREQ_LO;
 215                         v->rangehigh=FREQ_HI;
 216                         v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
 217                         v->capability=V4L2_TUNER_CAP_LOW;
 218                         if(get_stereo(card->io))
 219                                 v->audmode = V4L2_TUNER_MODE_STEREO;
 220                         else
 221                                 v->audmode = V4L2_TUNER_MODE_MONO;
 222                         v->signal=0xffff*get_tune(card->io);
 223
 224                         return 0;
 225                 }
 226                 case VIDIOC_S_TUNER:
 227                 {
 228                         struct v4l2_tuner *v = arg;
 229
 230                         if (v->index > 0)
 231                                 return -EINVAL;
 232
 233                         return 0;
 234                 }
 235                 case VIDIOC_S_FREQUENCY:
 236                 {
 237                         struct v4l2_frequency *f = arg;
 238
 239                         if (f->frequency < FREQ_LO || f->frequency > FREQ_HI)
 240                                 return -EINVAL;
 241
 242                         card->freq = f->frequency;
 243                         set_freq(card->io, FREQ2BITS(card->freq));
 244                         msleep(125);
 245                         return 0;
 246                 }
 247                 case VIDIOC_G_FREQUENCY:
 248                 {
 249                         struct v4l2_frequency *f = arg;
 250
 251                         f->type = V4L2_TUNER_RADIO;
 252                         f->frequency = card->freq;
 253
 254                         return 0;
 255                 }
 256                 case VIDIOC_QUERYCTRL:
 257                 {
 258                         struct v4l2_queryctrl *qc = arg;
 259                         int i;
 260
 261                         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 262                                 if (qc->id && qc->id == radio_qctrl[i].id) {
 263                                         memcpy(qc, &(radio_qctrl[i]),
 264                                                                 sizeof(*qc));
 265                                         return (0);
 266                                 }
 267                         }
 268                         return -EINVAL;
 269                 }
 270                 case VIDIOC_G_CTRL:
 271                 {
 272                         struct v4l2_control *ctrl= arg;
 273
 274                         switch (ctrl->id) {
 275                                 case V4L2_CID_AUDIO_MUTE:
 276                                         ctrl->value=card->muted;
 277                                         return (0);
 278                         }
 279                         return -EINVAL;
 280                 }
 281                 case VIDIOC_S_CTRL:
 282                 {
 283                         struct v4l2_control *ctrl= arg;
 284
 285                         switch (ctrl->id) {
 286                                 case V4L2_CID_AUDIO_MUTE:
 287                                         card->muted = ctrl->value;
 288                                         if(card->muted)
 289                                                 turn_power(card->io, 0);
 290                                         else
 291                                                 set_freq(card->io, FREQ2BITS(card->freq));
 292                                         return 0;
 293                         }
 294                         return -EINVAL;
 295                 }
 296
 297                 default:
 298                         return v4l_compat_translate_ioctl(inode,file,cmd,arg,
 299                                                           radio_function);
 300
 301         }
 302 }
 303
 304 static int radio_ioctl(struct inode *inode, struct file *file,
 305                        unsigned int cmd, unsigned long arg)
 306 {
 307         struct video_device *dev = video_devdata(file);
 308         struct radio_device *card=dev->priv;
 309         int ret;
 310
 311         mutex_lock(&card->lock);
 312         ret = video_usercopy(inode, file, cmd, arg, radio_function);
 313         mutex_unlock(&card->lock);
 314         return ret;
 315 }
 316
 317 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
 318 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
 319 MODULE_LICENSE("GPL");
 320
 321
 322 static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 323 {
 324         if(!request_region(pci_resource_start(pdev, 0),
 325                            pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 326                 printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
 327                 goto err_out;
 328         }
 329
 330         if (pci_enable_device(pdev))
 331                 goto err_out_free_region;
 332
 333         radio_unit.io = pci_resource_start(pdev, 0);
 334         mutex_init(&radio_unit.lock);
 335         maxiradio_radio.priv = &radio_unit;
 336
 337         if(video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
 338                 printk("radio-maxiradio: can't register device!");
 339                 goto err_out_free_region;
 340         }
 341
 342         printk(KERN_INFO "radio-maxiradio: version "
 343                DRIVER_VERSION
 344                " time "
 345                __TIME__ "  "
 346                __DATE__
 347                "\n");
 348
 349         printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
 350                radio_unit.io);
 351         return 0;
 352
 353 err_out_free_region:
 354         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 355 err_out:
 356         return -ENODEV;
 357 }
 358
 359 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 360 {
 361         video_unregister_device(&maxiradio_radio);
 362         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 363 }
 364
 365 static struct pci_device_id maxiradio_pci_tbl[] = {
 366         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 367                 PCI_ANY_ID, PCI_ANY_ID, },
 368         { 0,}
 369 };
 370
 371 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 372
 373 static struct pci_driver maxiradio_driver = {
 374         .name           = "radio-maxiradio",
 375         .id_table       = maxiradio_pci_tbl,
 376         .probe          = maxiradio_init_one,
 377         .remove         = __devexit_p(maxiradio_remove_one),
 378 };
 379
 380 static int __init maxiradio_radio_init(void)
 381 {
 382         return pci_register_driver(&maxiradio_driver);
 383 }
 384
 385 static void __exit maxiradio_radio_exit(void)
 386 {
 387         pci_unregister_driver(&maxiradio_driver);
 388 }
 389
 390 module_init(maxiradio_radio_init);
 391 module_exit(maxiradio_radio_exit);