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
  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  */
  31
  32
  33 #include <linux/module.h>
  34 #include <linux/init.h>
  35 #include <linux/ioport.h>
  36 #include <linux/delay.h>
  37 #include <linux/sched.h>
  38 #include <asm/io.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/semaphore.h>
  41 #include <linux/pci.h>
  42 #include <linux/videodev.h>
  43
  44 /* version 0.75      Sun Feb  4 22:51:27 EET 2001 */
  45 #define DRIVER_VERSION  "0.75"
  46
  47 #ifndef PCI_VENDOR_ID_GUILLEMOT
  48 #define PCI_VENDOR_ID_GUILLEMOT 0x5046
  49 #endif
  50
  51 #ifndef PCI_DEVICE_ID_GUILLEMOT
  52 #define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
  53 #endif
  54
  55
  56 /* TEA5757 pin mappings */
  57 static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;
  58
  59 static int radio_nr = -1;
  60 module_param(radio_nr, int, 0);
  61
  62
  63 #define FREQ_LO          50*16000
  64 #define FREQ_HI         150*16000
  65
  66 #define FREQ_IF         171200 /* 10.7*16000   */
  67 #define FREQ_STEP       200    /* 12.5*16      */
  68
  69 #define FREQ2BITS(x)    ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\
  70                         /(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */
  71
  72 #define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)
  73
  74
  75 static int radio_ioctl(struct inode *inode, struct file *file,
  76                        unsigned int cmd, unsigned long arg);
  77
  78 static struct file_operations maxiradio_fops = {
  79         .owner          = THIS_MODULE,
  80         .open           = video_exclusive_open,
  81         .release        = video_exclusive_release,
  82         .ioctl          = radio_ioctl,
  83         .llseek         = no_llseek,
  84 };
  85 static struct video_device maxiradio_radio =
  86 {
  87         .owner          = THIS_MODULE,
  88         .name           = "Maxi Radio FM2000 radio",
  89         .type           = VID_TYPE_TUNER,
  90         .hardware       = VID_HARDWARE_SF16MI,
  91         .fops           = &maxiradio_fops,
  92 };
  93
  94 static struct radio_device
  95 {
  96         __u16   io,     /* base of radio io */
  97                 muted,  /* VIDEO_AUDIO_MUTE */
  98                 stereo, /* VIDEO_TUNER_STEREO_ON */
  99                 tuned;  /* signal strength (0 or 0xffff) */
 100
 101         unsigned long freq;
 102
 103         struct  semaphore lock;
 104 } radio_unit = {0, 0, 0, 0, };
 105
 106
 107 static void outbit(unsigned long bit, __u16 io)
 108 {
 109         if(bit != 0)
 110                 {
 111                         outb(  power|wren|data     ,io); udelay(4);
 112                         outb(  power|wren|data|clk ,io); udelay(4);
 113                         outb(  power|wren|data     ,io); udelay(4);
 114                 }
 115         else
 116                 {
 117                         outb(  power|wren          ,io); udelay(4);
 118                         outb(  power|wren|clk      ,io); udelay(4);
 119                         outb(  power|wren          ,io); udelay(4);
 120                 }
 121 }
 122
 123 static void turn_power(__u16 io, int p)
 124 {
 125         if(p != 0) outb(power, io); else outb(0,io);
 126 }
 127
 128
 129 static void set_freq(__u16 io, __u32 data)
 130 {
 131         unsigned long int si;
 132         int bl;
 133
 134         /* TEA5757 shift register bits (see pdf) */
 135
 136         outbit(0,io); // 24  search
 137         outbit(1,io); // 23  search up/down
 138
 139         outbit(0,io); // 22  stereo/mono
 140
 141         outbit(0,io); // 21  band
 142         outbit(0,io); // 20  band (only 00=FM works I think)
 143
 144         outbit(0,io); // 19  port ?
 145         outbit(0,io); // 18  port ?
 146
 147         outbit(0,io); // 17  search level
 148         outbit(0,io); // 16  search level
 149
 150         si = 0x8000;
 151         for(bl = 1; bl <= 16 ; bl++) { outbit(data & si,io); si >>=1; }
 152
 153         outb(power,io);
 154 }
 155
 156 static int get_stereo(__u16 io)
 157 {
 158         outb(power,io); udelay(4);
 159         return !(inb(io) & mo_st);
 160 }
 161
 162 static int get_tune(__u16 io)
 163 {
 164         outb(power+clk,io); udelay(4);
 165         return !(inb(io) & mo_st);
 166 }
 167
 168
 169 inline static int radio_function(struct inode *inode, struct file *file,
 170                                  unsigned int cmd, void *arg)
 171 {
 172         struct video_device *dev = video_devdata(file);
 173         struct radio_device *card=dev->priv;
 174
 175         switch(cmd) {
 176                 case VIDIOCGCAP: {
 177                         struct video_capability *v = arg;
 178
 179                         memset(v,0,sizeof(*v));
 180                         strcpy(v->name, "Maxi Radio FM2000 radio");
 181                         v->type=VID_TYPE_TUNER;
 182                         v->channels=v->audios=1;
 183                         return 0;
 184                 }
 185                 case VIDIOCGTUNER: {
 186                         struct video_tuner *v = arg;
 187
 188                         if(v->tuner)
 189                                 return -EINVAL;
 190
 191                         card->stereo = 0xffff * get_stereo(card->io);
 192                         card->tuned = 0xffff * get_tune(card->io);
 193
 194                         v->flags = VIDEO_TUNER_LOW | card->stereo;
 195                         v->signal = card->tuned;
 196
 197                         strcpy(v->name, "FM");
 198
 199                         v->rangelow = FREQ_LO;
 200                         v->rangehigh = FREQ_HI;
 201                         v->mode = VIDEO_MODE_AUTO;
 202
 203                         return 0;
 204                 }
 205                 case VIDIOCSTUNER: {
 206                         struct video_tuner *v = arg;
 207                         if(v->tuner!=0)
 208                                 return -EINVAL;
 209                         return 0;
 210                 }
 211                 case VIDIOCGFREQ: {
 212                         unsigned long *freq = arg;
 213
 214                         *freq = card->freq;
 215                         return 0;
 216                 }
 217                 case VIDIOCSFREQ: {
 218                         unsigned long *freq = arg;
 219
 220                         if (*freq < FREQ_LO || *freq > FREQ_HI)
 221                                 return -EINVAL;
 222                         card->freq = *freq;
 223                         set_freq(card->io, FREQ2BITS(card->freq));
 224                         msleep(125);
 225                         return 0;
 226                 }
 227                 case VIDIOCGAUDIO: {
 228                         struct video_audio *v = arg;
 229                         memset(v,0,sizeof(*v));
 230                         strcpy(v->name, "Radio");
 231                         v->flags=VIDEO_AUDIO_MUTABLE | card->muted;
 232                         v->mode=VIDEO_SOUND_STEREO;
 233                         return 0;
 234                 }
 235
 236                 case VIDIOCSAUDIO: {
 237                         struct video_audio *v = arg;
 238
 239                         if(v->audio)
 240                                 return -EINVAL;
 241                         card->muted = v->flags & VIDEO_AUDIO_MUTE;
 242                         if(card->muted)
 243                                 turn_power(card->io, 0);
 244                         else
 245                                 set_freq(card->io, FREQ2BITS(card->freq));
 246                         return 0;
 247                 }
 248                 case VIDIOCGUNIT: {
 249                         struct video_unit *v = arg;
 250
 251                         v->video=VIDEO_NO_UNIT;
 252                         v->vbi=VIDEO_NO_UNIT;
 253                         v->radio=dev->minor;
 254                         v->audio=0;
 255                         v->teletext=VIDEO_NO_UNIT;
 256                         return 0;
 257                 }
 258                 default: return -ENOIOCTLCMD;
 259         }
 260 }
 261
 262 static int radio_ioctl(struct inode *inode, struct file *file,
 263                        unsigned int cmd, unsigned long arg)
 264 {
 265         struct video_device *dev = video_devdata(file);
 266         struct radio_device *card=dev->priv;
 267         int ret;
 268
 269         down(&card->lock);
 270         ret = video_usercopy(inode, file, cmd, arg, radio_function);
 271         up(&card->lock);
 272         return ret;
 273 }
 274
 275 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
 276 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
 277 MODULE_LICENSE("GPL");
 278
 279
 280 static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 281 {
 282         if(!request_region(pci_resource_start(pdev, 0),
 283                            pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 284                 printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
 285                 goto err_out;
 286         }
 287
 288         if (pci_enable_device(pdev))
 289                 goto err_out_free_region;
 290
 291         radio_unit.io = pci_resource_start(pdev, 0);
 292         init_MUTEX(&radio_unit.lock);
 293         maxiradio_radio.priv = &radio_unit;
 294
 295         if(video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
 296                 printk("radio-maxiradio: can't register device!");
 297                 goto err_out_free_region;
 298         }
 299
 300         printk(KERN_INFO "radio-maxiradio: version "
 301                DRIVER_VERSION
 302                " time "
 303                __TIME__ "  "
 304                __DATE__
 305                "\n");
 306
 307         printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
 308                radio_unit.io);
 309         return 0;
 310
 311 err_out_free_region:
 312         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 313 err_out:
 314         return -ENODEV;
 315 }
 316
 317 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 318 {
 319         video_unregister_device(&maxiradio_radio);
 320         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 321 }
 322
 323 static struct pci_device_id maxiradio_pci_tbl[] = {
 324         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 325                 PCI_ANY_ID, PCI_ANY_ID, },
 326         { 0,}
 327 };
 328
 329 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 330
 331 static struct pci_driver maxiradio_driver = {
 332         .name           = "radio-maxiradio",
 333         .id_table       = maxiradio_pci_tbl,
 334         .probe          = maxiradio_init_one,
 335         .remove         = __devexit_p(maxiradio_remove_one),
 336 };
 337
 338 static int __init maxiradio_radio_init(void)
 339 {
 340         return pci_module_init(&maxiradio_driver);
 341 }
 342
 343 static void __exit maxiradio_radio_exit(void)
 344 {
 345         pci_unregister_driver(&maxiradio_driver);
 346 }
 347
 348 module_init(maxiradio_radio_init);
 349 module_exit(maxiradio_radio_exit);