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