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 #include <media/v4l2-common.h>
  45
  46 /* version 0.75      Sun Feb  4 22:51:27 EET 2001 */
  47 #define DRIVER_VERSION  "0.75"
  48
  49 #ifndef PCI_VENDOR_ID_GUILLEMOT
  50 #define PCI_VENDOR_ID_GUILLEMOT 0x5046
  51 #endif
  52
  53 #ifndef PCI_DEVICE_ID_GUILLEMOT
  54 #define PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO 0x1001
  55 #endif
  56
  57
  58 /* TEA5757 pin mappings */
  59 static const int clk = 1, data = 2, wren = 4, mo_st = 8, power = 16 ;
  60
  61 static int radio_nr = -1;
  62 module_param(radio_nr, int, 0);
  63
  64
  65 #define FREQ_LO          50*16000
  66 #define FREQ_HI         150*16000
  67
  68 #define FREQ_IF         171200 /* 10.7*16000   */
  69 #define FREQ_STEP       200    /* 12.5*16      */
  70
  71 #define FREQ2BITS(x)    ((( (unsigned int)(x)+FREQ_IF+(FREQ_STEP<<1))\
  72                         /(FREQ_STEP<<2))<<2) /* (x==fmhz*16*1000) -> bits */
  73
  74 #define BITS2FREQ(x)    ((x) * FREQ_STEP - FREQ_IF)
  75
  76
  77 static int radio_ioctl(struct inode *inode, struct file *file,
  78                        unsigned int cmd, unsigned long arg);
  79
  80 static struct file_operations maxiradio_fops = {
  81         .owner          = THIS_MODULE,
  82         .open           = video_exclusive_open,
  83         .release        = video_exclusive_release,
  84         .ioctl          = radio_ioctl,
  85         .compat_ioctl   = v4l_compat_ioctl32,
  86         .llseek         = no_llseek,
  87 };
  88 static struct video_device maxiradio_radio =
  89 {
  90         .owner          = THIS_MODULE,
  91         .name           = "Maxi Radio FM2000 radio",
  92         .type           = VID_TYPE_TUNER,
  93         .hardware       = VID_HARDWARE_SF16MI,
  94         .fops           = &maxiradio_fops,
  95 };
  96
  97 static struct radio_device
  98 {
  99         __u16   io,     /* base of radio io */
 100                 muted,  /* VIDEO_AUDIO_MUTE */
 101                 stereo, /* VIDEO_TUNER_STEREO_ON */
 102                 tuned;  /* signal strength (0 or 0xffff) */
 103
 104         unsigned long freq;
 105
 106         struct mutex lock;
 107 } radio_unit = {0, 0, 0, 0, };
 108
 109
 110 static void outbit(unsigned long bit, __u16 io)
 111 {
 112         if(bit != 0)
 113                 {
 114                         outb(  power|wren|data     ,io); udelay(4);
 115                         outb(  power|wren|data|clk ,io); udelay(4);
 116                         outb(  power|wren|data     ,io); udelay(4);
 117                 }
 118         else
 119                 {
 120                         outb(  power|wren          ,io); udelay(4);
 121                         outb(  power|wren|clk      ,io); udelay(4);
 122                         outb(  power|wren          ,io); udelay(4);
 123                 }
 124 }
 125
 126 static void turn_power(__u16 io, int p)
 127 {
 128         if(p != 0) outb(power, io); else outb(0,io);
 129 }
 130
 131
 132 static void set_freq(__u16 io, __u32 data)
 133 {
 134         unsigned long int si;
 135         int bl;
 136
 137         /* TEA5757 shift register bits (see pdf) */
 138
 139         outbit(0,io); // 24  search
 140         outbit(1,io); // 23  search up/down
 141
 142         outbit(0,io); // 22  stereo/mono
 143
 144         outbit(0,io); // 21  band
 145         outbit(0,io); // 20  band (only 00=FM works I think)
 146
 147         outbit(0,io); // 19  port ?
 148         outbit(0,io); // 18  port ?
 149
 150         outbit(0,io); // 17  search level
 151         outbit(0,io); // 16  search level
 152
 153         si = 0x8000;
 154         for(bl = 1; bl <= 16 ; bl++) { outbit(data & si,io); si >>=1; }
 155
 156         outb(power,io);
 157 }
 158
 159 static int get_stereo(__u16 io)
 160 {
 161         outb(power,io); udelay(4);
 162         return !(inb(io) & mo_st);
 163 }
 164
 165 static int get_tune(__u16 io)
 166 {
 167         outb(power+clk,io); udelay(4);
 168         return !(inb(io) & mo_st);
 169 }
 170
 171
 172 static inline int radio_function(struct inode *inode, struct file *file,
 173                                  unsigned int cmd, void *arg)
 174 {
 175         struct video_device *dev = video_devdata(file);
 176         struct radio_device *card=dev->priv;
 177
 178         switch(cmd) {
 179                 case VIDIOCGCAP: {
 180                         struct video_capability *v = arg;
 181
 182                         memset(v,0,sizeof(*v));
 183                         strcpy(v->name, "Maxi Radio FM2000 radio");
 184                         v->type=VID_TYPE_TUNER;
 185                         v->channels=v->audios=1;
 186                         return 0;
 187                 }
 188                 case VIDIOCGTUNER: {
 189                         struct video_tuner *v = arg;
 190
 191                         if(v->tuner)
 192                                 return -EINVAL;
 193
 194                         card->stereo = 0xffff * get_stereo(card->io);
 195                         card->tuned = 0xffff * get_tune(card->io);
 196
 197                         v->flags = VIDEO_TUNER_LOW | card->stereo;
 198                         v->signal = card->tuned;
 199
 200                         strcpy(v->name, "FM");
 201
 202                         v->rangelow = FREQ_LO;
 203                         v->rangehigh = FREQ_HI;
 204                         v->mode = VIDEO_MODE_AUTO;
 205
 206                         return 0;
 207                 }
 208                 case VIDIOCSTUNER: {
 209                         struct video_tuner *v = arg;
 210                         if(v->tuner!=0)
 211                                 return -EINVAL;
 212                         return 0;
 213                 }
 214                 case VIDIOCGFREQ: {
 215                         unsigned long *freq = arg;
 216
 217                         *freq = card->freq;
 218                         return 0;
 219                 }
 220                 case VIDIOCSFREQ: {
 221                         unsigned long *freq = arg;
 222
 223                         if (*freq < FREQ_LO || *freq > FREQ_HI)
 224                                 return -EINVAL;
 225                         card->freq = *freq;
 226                         set_freq(card->io, FREQ2BITS(card->freq));
 227                         msleep(125);
 228                         return 0;
 229                 }
 230                 case VIDIOCGAUDIO: {
 231                         struct video_audio *v = arg;
 232                         memset(v,0,sizeof(*v));
 233                         strcpy(v->name, "Radio");
 234                         v->flags=VIDEO_AUDIO_MUTABLE | card->muted;
 235                         v->mode=VIDEO_SOUND_STEREO;
 236                         return 0;
 237                 }
 238
 239                 case VIDIOCSAUDIO: {
 240                         struct video_audio *v = arg;
 241
 242                         if(v->audio)
 243                                 return -EINVAL;
 244                         card->muted = v->flags & VIDEO_AUDIO_MUTE;
 245                         if(card->muted)
 246                                 turn_power(card->io, 0);
 247                         else
 248                                 set_freq(card->io, FREQ2BITS(card->freq));
 249                         return 0;
 250                 }
 251                 case VIDIOCGUNIT: {
 252                         struct video_unit *v = arg;
 253
 254                         v->video=VIDEO_NO_UNIT;
 255                         v->vbi=VIDEO_NO_UNIT;
 256                         v->radio=dev->minor;
 257                         v->audio=0;
 258                         v->teletext=VIDEO_NO_UNIT;
 259                         return 0;
 260                 }
 261                 default: return -ENOIOCTLCMD;
 262         }
 263 }
 264
 265 static int radio_ioctl(struct inode *inode, struct file *file,
 266                        unsigned int cmd, unsigned long arg)
 267 {
 268         struct video_device *dev = video_devdata(file);
 269         struct radio_device *card=dev->priv;
 270         int ret;
 271
 272         mutex_lock(&card->lock);
 273         ret = video_usercopy(inode, file, cmd, arg, radio_function);
 274         mutex_unlock(&card->lock);
 275         return ret;
 276 }
 277
 278 MODULE_AUTHOR("Dimitromanolakis Apostolos, apdim@grecian.net");
 279 MODULE_DESCRIPTION("Radio driver for the Guillemot Maxi Radio FM2000 radio.");
 280 MODULE_LICENSE("GPL");
 281
 282
 283 static int __devinit maxiradio_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 284 {
 285         if(!request_region(pci_resource_start(pdev, 0),
 286                            pci_resource_len(pdev, 0), "Maxi Radio FM 2000")) {
 287                 printk(KERN_ERR "radio-maxiradio: can't reserve I/O ports\n");
 288                 goto err_out;
 289         }
 290
 291         if (pci_enable_device(pdev))
 292                 goto err_out_free_region;
 293
 294         radio_unit.io = pci_resource_start(pdev, 0);
 295         mutex_init(&radio_unit.lock);
 296         maxiradio_radio.priv = &radio_unit;
 297
 298         if(video_register_device(&maxiradio_radio, VFL_TYPE_RADIO, radio_nr)==-1) {
 299                 printk("radio-maxiradio: can't register device!");
 300                 goto err_out_free_region;
 301         }
 302
 303         printk(KERN_INFO "radio-maxiradio: version "
 304                DRIVER_VERSION
 305                " time "
 306                __TIME__ "  "
 307                __DATE__
 308                "\n");
 309
 310         printk(KERN_INFO "radio-maxiradio: found Guillemot MAXI Radio device (io = 0x%x)\n",
 311                radio_unit.io);
 312         return 0;
 313
 314 err_out_free_region:
 315         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 316 err_out:
 317         return -ENODEV;
 318 }
 319
 320 static void __devexit maxiradio_remove_one(struct pci_dev *pdev)
 321 {
 322         video_unregister_device(&maxiradio_radio);
 323         release_region(pci_resource_start(pdev, 0), pci_resource_len(pdev, 0));
 324 }
 325
 326 static struct pci_device_id maxiradio_pci_tbl[] = {
 327         { PCI_VENDOR_ID_GUILLEMOT, PCI_DEVICE_ID_GUILLEMOT_MAXIRADIO,
 328                 PCI_ANY_ID, PCI_ANY_ID, },
 329         { 0,}
 330 };
 331
 332 MODULE_DEVICE_TABLE(pci, maxiradio_pci_tbl);
 333
 334 static struct pci_driver maxiradio_driver = {
 335         .name           = "radio-maxiradio",
 336         .id_table       = maxiradio_pci_tbl,
 337         .probe          = maxiradio_init_one,
 338         .remove         = __devexit_p(maxiradio_remove_one),
 339 };
 340
 341 static int __init maxiradio_radio_init(void)
 342 {
 343         return pci_register_driver(&maxiradio_driver);
 344 }
 345
 346 static void __exit maxiradio_radio_exit(void)
 347 {
 348         pci_unregister_driver(&maxiradio_driver);
 349 }
 350
 351 module_init(maxiradio_radio_init);
 352 module_exit(maxiradio_radio_exit);