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 <linux/mutex.h>
  41
  42 #include <linux/pci.h>
  43 #include <linux/videodev.h>
  44
  45 /* version 0.75      Sun Feb  4 22:51:27 EET 2001 */
  46 #define DRIVER_VERSION  "0.75"
  47
  48 #ifndef PCI_VENDOR_ID_GUILLEMOT
  49 #define PCI_VENDOR_ID_GUILLEMOT 0x5046
  50 #endif
  51
  52 #ifndef PCI_DEVICE_ID_GUILLEMOT
  53 #define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
  54 #endif
  55
  56
  57 /* TEA5757 pin mappings */
  58 static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;
  59
  60 static int radio_nr = -1;
  61 module_param(radio_nr, int, 0);
  62
  63
  64 #define FREQ_LO          50*16000
  65 #define FREQ_HI         150*16000
  66
  67 #define FREQ_IF         171200 /* 10.7*16000   */
  68 #define FREQ_STEP       200    /* 12.5*16      */
  69
  70 #define FREQ2BITS(x)    ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\
  71                         /(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */
  72
  73 #define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)
  74
  75
  76 static int radio_ioctl(struct inode *inode, struct file *file,
  77                        unsigned int cmd, unsigned long arg);
  78
  79 static struct file_operations maxiradio_fops = {
  80         .owner          = THIS_MODULE,
  81         .open           = video_exclusive_open,
  82         .release        = video_exclusive_release,
  83         .ioctl          = radio_ioctl,
  84         .compat_ioctl   = v4l_compat_ioctl32,
  85         .llseek         = no_llseek,
  86 };
  87 static struct video_device maxiradio_radio =
  88 {
  89         .owner          = THIS_MODULE,
  90         .name           = "Maxi Radio FM2000 radio",
  91         .type           = VID_TYPE_TUNER,
  92         .hardware       = VID_HARDWARE_SF16MI,
  93         .fops           = &maxiradio_fops,
  94 };
  95
  96 static struct radio_device
  97 {
  98         __u16   io,     /* base of radio io */
  99                 muted,  /* VIDEO_AUDIO_MUTE */
 100                 stereo, /* VIDEO_TUNER_STEREO_ON */
 101                 tuned;  /* signal strength (0 or 0xffff) */
 102
 103         unsigned long freq;
 104
 105         struct mutex lock;
 106 } radio_unit = {0, 0, 0, 0, };
 107
 108
 109 static void outbit(unsigned long bit, __u16 io)
 110 {
 111         if(bit != 0)
 112                 {
 113                         outb(  power|wren|data     ,io); udelay(4);
 114                         outb(  power|wren|data|clk ,io); udelay(4);
 115                         outb(  power|wren|data     ,io); udelay(4);
 116                 }
 117         else
 118                 {
 119                         outb(  power|wren          ,io); udelay(4);
 120                         outb(  power|wren|clk      ,io); udelay(4);
 121                         outb(  power|wren          ,io); udelay(4);
 122                 }
 123 }
 124
 125 static void turn_power(__u16 io, int p)
 126 {
 127         if(p != 0) outb(power, io); else outb(0,io);
 128 }
 129
 130
 131 static void set_freq(__u16 io, __u32 data)
 132 {
 133         unsigned long int si;
 134         int bl;
 135
 136         /* TEA5757 shift register bits (see pdf) */
 137
 138         outbit(0,io); // 24  search
 139         outbit(1,io); // 23  search up/down
 140
 141         outbit(0,io); // 22  stereo/mono
 142
 143         outbit(0,io); // 21  band
 144         outbit(0,io); // 20  band (only 00=FM works I think)
 145
 146         outbit(0,io); // 19  port ?
 147         outbit(0,io); // 18  port ?
 148
 149         outbit(0,io); // 17  search level
 150         outbit(0,io); // 16  search level
 151
 152         si = 0x8000;
 153         for(bl = 1; bl <= 16 ; bl++) { outbit(data & si,io); si >>=1; }
 154
 155         outb(power,io);
 156 }
 157
 158 static int get_stereo(__u16 io)
 159 {
 160         outb(power,io); udelay(4);
 161         return !(inb(io) & mo_st);
 162 }
 163
 164 static int get_tune(__u16 io)
 165 {
 166         outb(power+clk,io); udelay(4);
 167         return !(inb(io) & mo_st);
 168 }
 169
 170
 171 static inline int radio_function(struct inode *inode, struct file *file,
 172                                  unsigned int cmd, void *arg)
 173 {
 174         struct video_device *dev = video_devdata(file);
 175         struct radio_device *card=dev->priv;
 176
 177         switch(cmd) {
 178                 case VIDIOCGCAP: {
 179                         struct video_capability *v = arg;
 180
 181                         memset(v,0,sizeof(*v));
 182                         strcpy(v->name, "Maxi Radio FM2000 radio");
 183                         v->type=VID_TYPE_TUNER;
 184                         v->channels=v->audios=1;
 185                         return 0;
 186                 }
 187                 case VIDIOCGTUNER: {
 188                         struct video_tuner *v = arg;
 189
 190                         if(v->tuner)
 191                                 return -EINVAL;
 192
 193                         card->stereo = 0xffff * get_stereo(card->io);
 194                         card->tuned = 0xffff * get_tune(card->io);
 195
 196                         v->flags = VIDEO_TUNER_LOW | card->stereo;
 197                         v->signal = card->tuned;
 198
 199                         strcpy(v->name, "FM");
 200
 201                         v->rangelow = FREQ_LO;
 202                         v->rangehigh = FREQ_HI;
 203                         v->mode = VIDEO_MODE_AUTO;
 204
 205                         return 0;
 206                 }
 207                 case VIDIOCSTUNER: {
 208                         struct video_tuner *v = arg;
 209                         if(v->tuner!=0)
 210                                 return -EINVAL;
 211                         return 0;
 212                 }
 213                 case VIDIOCGFREQ: {
 214                         unsigned long *freq = arg;
 215
 216                         *freq = card->freq;
 217                         return 0;
 218                 }
 219                 case VIDIOCSFREQ: {
 220                         unsigned long *freq = arg;
 221
 222                         if (*freq < FREQ_LO || *freq > FREQ_HI)
 223                                 return -EINVAL;
 224                         card->freq = *freq;
 225                         set_freq(card->io, FREQ2BITS(card->freq));
 226                         msleep(125);
 227                         return 0;
 228                 }
 229                 case VIDIOCGAUDIO: {
 230                         struct video_audio *v = arg;
 231                         memset(v,0,sizeof(*v));
 232                         strcpy(v->name, "Radio");
 233                         v->flags=VIDEO_AUDIO_MUTABLE | card->muted;
 234                         v->mode=VIDEO_SOUND_STEREO;
 235                         return 0;
 236                 }
 237
 238                 case VIDIOCSAUDIO: {
 239                         struct video_audio *v = arg;
 240
 241                         if(v->audio)
 242                                 return -EINVAL;
 243                         card->muted = v->flags & VIDEO_AUDIO_MUTE;
 244                         if(card->muted)
 245                                 turn_power(card->io, 0);
 246                         else
 247                                 set_freq(card->io, FREQ2BITS(card->freq));
 248                         return 0;
 249                 }
 250                 case VIDIOCGUNIT: {
 251                         struct video_unit *v = arg;
 252
 253                         v->video=VIDEO_NO_UNIT;
 254                         v->vbi=VIDEO_NO_UNIT;
 255                         v->radio=dev->minor;
 256                         v->audio=0;
 257                         v->teletext=VIDEO_NO_UNIT;
 258                         return 0;
 259                 }
 260                 default: return -ENOIOCTLCMD;
 261         }
 262 }
 263
 264 static int radio_ioctl(struct inode *inode, struct file *file,
 265                        unsigned int cmd, unsigned long arg)
 266 {
 267         struct video_device *dev = video_devdata(file);
 268         struct radio_device *card=dev->priv;
 269         int ret;
 270
 271         mutex_lock(&card->lock);
 272         ret = video_usercopy(inode, file, cmd, arg, radio_function);
 273         mutex_unlock(&card->lock);
 274         return ret;
 275 }
 276
 277 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
 278 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
 279 MODULE_LICENSE("GPL");
 280
 281
 282 static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 283 {
 284         if(!request_region(pci_resource_start(pdev, 0),
 285                            pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 286                 printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
 287                 goto err_out;
 288         }
 289
 290         if (pci_enable_device(pdev))
 291                 goto err_out_free_region;
 292
 293         radio_unit.io = pci_resource_start(pdev, 0);
 294         mutex_init(&radio_unit.lock);
 295         maxiradio_radio.priv = &radio_unit;
 296
 297         if(video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
 298                 printk("radio-maxiradio: can't register device!");
 299                 goto err_out_free_region;
 300         }
 301
 302         printk(KERN_INFO "radio-maxiradio: version "
 303                DRIVER_VERSION
 304                " time "
 305                __TIME__ "  "
 306                __DATE__
 307                "\n");
 308
 309         printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
 310                radio_unit.io);
 311         return 0;
 312
 313 err_out_free_region:
 314         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 315 err_out:
 316         return -ENODEV;
 317 }
 318
 319 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 320 {
 321         video_unregister_device(&maxiradio_radio);
 322         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 323 }
 324
 325 static struct pci_device_id maxiradio_pci_tbl[] = {
 326         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 327                 PCI_ANY_ID, PCI_ANY_ID, },
 328         { 0,}
 329 };
 330
 331 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 332
 333 static struct pci_driver maxiradio_driver = {
 334         .name           = "radio-maxiradio",
 335         .id_table       = maxiradio_pci_tbl,
 336         .probe          = maxiradio_init_one,
 337         .remove         = __devexit_p(maxiradio_remove_one),
 338 };
 339
 340 static int __init maxiradio_radio_init(void)
 341 {
 342         return pci_register_driver(&maxiradio_driver);
 343 }
 344
 345 static void __exit maxiradio_radio_exit(void)
 346 {
 347         pci_unregister_driver(&maxiradio_driver);
 348 }
 349
 350 module_init(maxiradio_radio_init);
 351 module_exit(maxiradio_radio_exit);