drivers/media/radio/radio-trust.c

   1 /* radio-trust.c - Trust FM Radio card driver for Linux 2.2
   2  * by Eric Lammerts <eric@scintilla.utwente.nl>
   3  *
   4  * Based on radio-aztech.c. Original notes:
   5  *
   6  * Adapted to support the Video for Linux API by
   7  * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
   8  *
   9  * Quay Ly
  10  * Donald Song
  11  * Jason Lewis      (jlewis@twilight.vtc.vsc.edu)
  12  * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
  13  * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
  14  *
  15  * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
  16  */
  17
  18 #include <stdarg.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/ioport.h>
  22 #include <asm/io.h>
  23 #include <asm/uaccess.h>
  24 #include <linux/videodev.h>
  25 #include <media/v4l2-common.h>
  26 #include <linux/config.h>       /* CONFIG_RADIO_TRUST_PORT      */
  27
  28 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  29
  30 #ifndef CONFIG_RADIO_TRUST_PORT
  31 #define CONFIG_RADIO_TRUST_PORT -1
  32 #endif
  33
  34 static int io = CONFIG_RADIO_TRUST_PORT;
  35 static int radio_nr = -1;
  36 static int ioval = 0xf;
  37 static __u16 curvol;
  38 static __u16 curbass;
  39 static __u16 curtreble;
  40 static unsigned long curfreq;
  41 static int curstereo;
  42 static int curmute;
  43
  44 /* i2c addresses */
  45 #define TDA7318_ADDR 0x88
  46 #define TSA6060T_ADDR 0xc4
  47
  48 #define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
  49 #define TR_SET_SCL outb(ioval |= 2, io)
  50 #define TR_CLR_SCL outb(ioval &= 0xfd, io)
  51 #define TR_SET_SDA outb(ioval |= 1, io)
  52 #define TR_CLR_SDA outb(ioval &= 0xfe, io)
  53
  54 static void write_i2c(int n, ...)
  55 {
  56         unsigned char val, mask;
  57         va_list args;
  58
  59         va_start(args, n);
  60
  61         /* start condition */
  62         TR_SET_SDA;
  63         TR_SET_SCL;
  64         TR_DELAY;
  65         TR_CLR_SDA;
  66         TR_CLR_SCL;
  67         TR_DELAY;
  68
  69         for(; n; n--) {
  70                 val = va_arg(args, unsigned);
  71                 for(mask = 0x80; mask; mask >>= 1) {
  72                         if(val & mask)
  73                                 TR_SET_SDA;
  74                         else
  75                                 TR_CLR_SDA;
  76                         TR_SET_SCL;
  77                         TR_DELAY;
  78                         TR_CLR_SCL;
  79                         TR_DELAY;
  80                 }
  81                 /* acknowledge bit */
  82                 TR_SET_SDA;
  83                 TR_SET_SCL;
  84                 TR_DELAY;
  85                 TR_CLR_SCL;
  86                 TR_DELAY;
  87         }
  88
  89         /* stop condition */
  90         TR_CLR_SDA;
  91         TR_DELAY;
  92         TR_SET_SCL;
  93         TR_DELAY;
  94         TR_SET_SDA;
  95         TR_DELAY;
  96
  97         va_end(args);
  98 }
  99
 100 static void tr_setvol(__u16 vol)
 101 {
 102         curvol = vol / 2048;
 103         write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
 104 }
 105
 106 static int basstreble2chip[15] = {
 107         0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
 108 };
 109
 110 static void tr_setbass(__u16 bass)
 111 {
 112         curbass = bass / 4370;
 113         write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
 114 }
 115
 116 static void tr_settreble(__u16 treble)
 117 {
 118         curtreble = treble / 4370;
 119         write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
 120 }
 121
 122 static void tr_setstereo(int stereo)
 123 {
 124         curstereo = !!stereo;
 125         ioval = (ioval & 0xfb) | (!curstereo << 2);
 126         outb(ioval, io);
 127 }
 128
 129 static void tr_setmute(int mute)
 130 {
 131         curmute = !!mute;
 132         ioval = (ioval & 0xf7) | (curmute << 3);
 133         outb(ioval, io);
 134 }
 135
 136 static int tr_getsigstr(void)
 137 {
 138         int i, v;
 139
 140         for(i = 0, v = 0; i < 100; i++) v |= inb(io);
 141         return (v & 1)? 0 : 0xffff;
 142 }
 143
 144 static int tr_getstereo(void)
 145 {
 146         /* don't know how to determine it, just return the setting */
 147         return curstereo;
 148 }
 149
 150 static void tr_setfreq(unsigned long f)
 151 {
 152         f /= 160;       /* Convert to 10 kHz units      */
 153         f += 1070;      /* Add 10.7 MHz IF                      */
 154
 155         write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
 156 }
 157
 158 static int tr_do_ioctl(struct inode *inode, struct file *file,
 159                        unsigned int cmd, void *arg)
 160 {
 161         switch(cmd)
 162         {
 163                 case VIDIOCGCAP:
 164                 {
 165                         struct video_capability *v = arg;
 166
 167                         memset(v,0,sizeof(*v));
 168                         v->type=VID_TYPE_TUNER;
 169                         v->channels=1;
 170                         v->audios=1;
 171                         strcpy(v->name, "Trust FM Radio");
 172
 173                         return 0;
 174                 }
 175                 case VIDIOCGTUNER:
 176                 {
 177                         struct video_tuner *v = arg;
 178
 179                         if(v->tuner)    /* Only 1 tuner */
 180                                 return -EINVAL;
 181
 182                         v->rangelow = 87500 * 16;
 183                         v->rangehigh = 108000 * 16;
 184                         v->flags = VIDEO_TUNER_LOW;
 185                         v->mode = VIDEO_MODE_AUTO;
 186
 187                         v->signal = tr_getsigstr();
 188                         if(tr_getstereo())
 189                                 v->flags |= VIDEO_TUNER_STEREO_ON;
 190
 191                         strcpy(v->name, "FM");
 192
 193                         return 0;
 194                 }
 195                 case VIDIOCSTUNER:
 196                 {
 197                         struct video_tuner *v = arg;
 198                         if(v->tuner != 0)
 199                                 return -EINVAL;
 200                         return 0;
 201                 }
 202                 case VIDIOCGFREQ:
 203                 {
 204                         unsigned long *freq = arg;
 205                         *freq = curfreq;
 206                         return 0;
 207                 }
 208                 case VIDIOCSFREQ:
 209                 {
 210                         unsigned long *freq = arg;
 211                         tr_setfreq(*freq);
 212                         return 0;
 213                 }
 214                 case VIDIOCGAUDIO:
 215                 {
 216                         struct video_audio *v = arg;
 217
 218                         memset(v,0, sizeof(*v));
 219                         v->flags = VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME |
 220                                   VIDEO_AUDIO_BASS | VIDEO_AUDIO_TREBLE;
 221                         v->mode = curstereo? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
 222                         v->volume = curvol * 2048;
 223                         v->step = 2048;
 224                         v->bass = curbass * 4370;
 225                         v->treble = curtreble * 4370;
 226
 227                         strcpy(v->name, "Trust FM Radio");
 228                         return 0;
 229                 }
 230                 case VIDIOCSAUDIO:
 231                 {
 232                         struct video_audio *v = arg;
 233
 234                         if(v->audio)
 235                                 return -EINVAL;
 236                         tr_setvol(v->volume);
 237                         tr_setbass(v->bass);
 238                         tr_settreble(v->treble);
 239                         tr_setstereo(v->mode & VIDEO_SOUND_STEREO);
 240                         tr_setmute(v->flags & VIDEO_AUDIO_MUTE);
 241                         return 0;
 242                 }
 243                 default:
 244                         return -ENOIOCTLCMD;
 245         }
 246 }
 247
 248 static int tr_ioctl(struct inode *inode, struct file *file,
 249                     unsigned int cmd, unsigned long arg)
 250 {
 251         return video_usercopy(inode, file, cmd, arg, tr_do_ioctl);
 252 }
 253
 254 static struct file_operations trust_fops = {
 255         .owner          = THIS_MODULE,
 256         .open           = video_exclusive_open,
 257         .release        = video_exclusive_release,
 258         .ioctl          = tr_ioctl,
 259         .compat_ioctl   = v4l_compat_ioctl32,
 260         .llseek         = no_llseek,
 261 };
 262
 263 static struct video_device trust_radio=
 264 {
 265         .owner          = THIS_MODULE,
 266         .name           = "Trust FM Radio",
 267         .type           = VID_TYPE_TUNER,
 268         .hardware       = VID_HARDWARE_TRUST,
 269         .fops           = &trust_fops,
 270 };
 271
 272 static int __init trust_init(void)
 273 {
 274         if(io == -1) {
 275                 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
 276                 return -EINVAL;
 277         }
 278         if(!request_region(io, 2, "Trust FM Radio")) {
 279                 printk(KERN_ERR "trust: port 0x%x already in use\n", io);
 280                 return -EBUSY;
 281         }
 282         if(video_register_device(&trust_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 283         {
 284                 release_region(io, 2);
 285                 return -EINVAL;
 286         }
 287
 288         printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");
 289
 290         write_i2c(2, TDA7318_ADDR, 0x80);       /* speaker att. LF = 0 dB */
 291         write_i2c(2, TDA7318_ADDR, 0xa0);       /* speaker att. RF = 0 dB */
 292         write_i2c(2, TDA7318_ADDR, 0xc0);       /* speaker att. LR = 0 dB */
 293         write_i2c(2, TDA7318_ADDR, 0xe0);       /* speaker att. RR = 0 dB */
 294         write_i2c(2, TDA7318_ADDR, 0x40);       /* stereo 1 input, gain = 18.75 dB */
 295
 296         tr_setvol(0x8000);
 297         tr_setbass(0x8000);
 298         tr_settreble(0x8000);
 299         tr_setstereo(1);
 300
 301         /* mute card - prevents noisy bootups */
 302         tr_setmute(1);
 303
 304         return 0;
 305 }
 306
 307 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
 308 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
 309 MODULE_LICENSE("GPL");
 310
 311 module_param(io, int, 0);
 312 MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
 313 module_param(radio_nr, int, 0);
 314
 315 static void __exit cleanup_trust_module(void)
 316 {
 317         video_unregister_device(&trust_radio);
 318         release_region(io, 2);
 319 }
 320
 321 module_init(trust_init);
 322 module_exit(cleanup_trust_module);