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  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  16  */
  17
  18 #include <stdarg.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/ioport.h>
  22 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  23 #include <linux/videodev2.h>
  24 #include <linux/io.h>
  25 #include <media/v4l2-device.h>
  26 #include <media/v4l2-ioctl.h>
  27
  28 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  29 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
  30 MODULE_LICENSE("GPL");
  31
  32 /* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
  33
  34 #ifndef CONFIG_RADIO_TRUST_PORT
  35 #define CONFIG_RADIO_TRUST_PORT -1
  36 #endif
  37
  38 static int io = CONFIG_RADIO_TRUST_PORT;
  39 static int radio_nr = -1;
  40
  41 module_param(io, int, 0);
  42 MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
  43 module_param(radio_nr, int, 0);
  44
  45 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
  46
  47 struct trust {
  48         struct v4l2_device v4l2_dev;
  49         struct video_device vdev;
  50         int io;
  51         int ioval;
  52         __u16 curvol;
  53         __u16 curbass;
  54         __u16 curtreble;
  55         int muted;
  56         unsigned long curfreq;
  57         int curstereo;
  58         int curmute;
  59         struct mutex lock;
  60 };
  61
  62 static struct trust trust_card;
  63
  64 /* i2c addresses */
  65 #define TDA7318_ADDR 0x88
  66 #define TSA6060T_ADDR 0xc4
  67
  68 #define TR_DELAY do { inb(tr->io); inb(tr->io); inb(tr->io); } while (0)
  69 #define TR_SET_SCL outb(tr->ioval |= 2, tr->io)
  70 #define TR_CLR_SCL outb(tr->ioval &= 0xfd, tr->io)
  71 #define TR_SET_SDA outb(tr->ioval |= 1, tr->io)
  72 #define TR_CLR_SDA outb(tr->ioval &= 0xfe, tr->io)
  73
  74 static void write_i2c(struct trust *tr, int n, ...)
  75 {
  76         unsigned char val, mask;
  77         va_list args;
  78
  79         va_start(args, n);
  80
  81         /* start condition */
  82         TR_SET_SDA;
  83         TR_SET_SCL;
  84         TR_DELAY;
  85         TR_CLR_SDA;
  86         TR_CLR_SCL;
  87         TR_DELAY;
  88
  89         for(; n; n--) {
  90                 val = va_arg(args, unsigned);
  91                 for(mask = 0x80; mask; mask >>= 1) {
  92                         if(val & mask)
  93                                 TR_SET_SDA;
  94                         else
  95                                 TR_CLR_SDA;
  96                         TR_SET_SCL;
  97                         TR_DELAY;
  98                         TR_CLR_SCL;
  99                         TR_DELAY;
 100                 }
 101                 /* acknowledge bit */
 102                 TR_SET_SDA;
 103                 TR_SET_SCL;
 104                 TR_DELAY;
 105                 TR_CLR_SCL;
 106                 TR_DELAY;
 107         }
 108
 109         /* stop condition */
 110         TR_CLR_SDA;
 111         TR_DELAY;
 112         TR_SET_SCL;
 113         TR_DELAY;
 114         TR_SET_SDA;
 115         TR_DELAY;
 116
 117         va_end(args);
 118 }
 119
 120 static void tr_setvol(struct trust *tr, __u16 vol)
 121 {
 122         mutex_lock(&tr->lock);
 123         tr->curvol = vol / 2048;
 124         write_i2c(tr, 2, TDA7318_ADDR, tr->curvol ^ 0x1f);
 125         mutex_unlock(&tr->lock);
 126 }
 127
 128 static int basstreble2chip[15] = {
 129         0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
 130 };
 131
 132 static void tr_setbass(struct trust *tr, __u16 bass)
 133 {
 134         mutex_lock(&tr->lock);
 135         tr->curbass = bass / 4370;
 136         write_i2c(tr, 2, TDA7318_ADDR, 0x60 | basstreble2chip[tr->curbass]);
 137         mutex_unlock(&tr->lock);
 138 }
 139
 140 static void tr_settreble(struct trust *tr, __u16 treble)
 141 {
 142         mutex_lock(&tr->lock);
 143         tr->curtreble = treble / 4370;
 144         write_i2c(tr, 2, TDA7318_ADDR, 0x70 | basstreble2chip[tr->curtreble]);
 145         mutex_unlock(&tr->lock);
 146 }
 147
 148 static void tr_setstereo(struct trust *tr, int stereo)
 149 {
 150         mutex_lock(&tr->lock);
 151         tr->curstereo = !!stereo;
 152         tr->ioval = (tr->ioval & 0xfb) | (!tr->curstereo << 2);
 153         outb(tr->ioval, tr->io);
 154         mutex_unlock(&tr->lock);
 155 }
 156
 157 static void tr_setmute(struct trust *tr, int mute)
 158 {
 159         mutex_lock(&tr->lock);
 160         tr->curmute = !!mute;
 161         tr->ioval = (tr->ioval & 0xf7) | (tr->curmute << 3);
 162         outb(tr->ioval, tr->io);
 163         mutex_unlock(&tr->lock);
 164 }
 165
 166 static int tr_getsigstr(struct trust *tr)
 167 {
 168         int i, v;
 169
 170         mutex_lock(&tr->lock);
 171         for (i = 0, v = 0; i < 100; i++)
 172                 v |= inb(tr->io);
 173         mutex_unlock(&tr->lock);
 174         return (v & 1) ? 0 : 0xffff;
 175 }
 176
 177 static int tr_getstereo(struct trust *tr)
 178 {
 179         /* don't know how to determine it, just return the setting */
 180         return tr->curstereo;
 181 }
 182
 183 static void tr_setfreq(struct trust *tr, unsigned long f)
 184 {
 185         mutex_lock(&tr->lock);
 186         tr->curfreq = f;
 187         f /= 160;       /* Convert to 10 kHz units      */
 188         f += 1070;      /* Add 10.7 MHz IF              */
 189         write_i2c(tr, 5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
 190         mutex_unlock(&tr->lock);
 191 }
 192
 193 static int vidioc_querycap(struct file *file, void *priv,
 194                                 struct v4l2_capability *v)
 195 {
 196         strlcpy(v->driver, "radio-trust", sizeof(v->driver));
 197         strlcpy(v->card, "Trust FM Radio", sizeof(v->card));
 198         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 199         v->version = RADIO_VERSION;
 200         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 201         return 0;
 202 }
 203
 204 static int vidioc_g_tuner(struct file *file, void *priv,
 205                                 struct v4l2_tuner *v)
 206 {
 207         struct trust *tr = video_drvdata(file);
 208
 209         if (v->index > 0)
 210                 return -EINVAL;
 211
 212         strlcpy(v->name, "FM", sizeof(v->name));
 213         v->type = V4L2_TUNER_RADIO;
 214         v->rangelow = 87.5 * 16000;
 215         v->rangehigh = 108 * 16000;
 216         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 217         v->capability = V4L2_TUNER_CAP_LOW;
 218         if (tr_getstereo(tr))
 219                 v->audmode = V4L2_TUNER_MODE_STEREO;
 220         else
 221                 v->audmode = V4L2_TUNER_MODE_MONO;
 222         v->signal = tr_getsigstr(tr);
 223         return 0;
 224 }
 225
 226 static int vidioc_s_tuner(struct file *file, void *priv,
 227                                 struct v4l2_tuner *v)
 228 {
 229         struct trust *tr = video_drvdata(file);
 230
 231         if (v->index)
 232                 return -EINVAL;
 233         tr_setstereo(tr, v->audmode == V4L2_TUNER_MODE_STEREO);
 234         return 0;
 235 }
 236
 237 static int vidioc_s_frequency(struct file *file, void *priv,
 238                                 struct v4l2_frequency *f)
 239 {
 240         struct trust *tr = video_drvdata(file);
 241
 242         tr_setfreq(tr, f->frequency);
 243         return 0;
 244 }
 245
 246 static int vidioc_g_frequency(struct file *file, void *priv,
 247                                 struct v4l2_frequency *f)
 248 {
 249         struct trust *tr = video_drvdata(file);
 250
 251         f->type = V4L2_TUNER_RADIO;
 252         f->frequency = tr->curfreq;
 253         return 0;
 254 }
 255
 256 static int vidioc_queryctrl(struct file *file, void *priv,
 257                                 struct v4l2_queryctrl *qc)
 258 {
 259         switch (qc->id) {
 260         case V4L2_CID_AUDIO_MUTE:
 261                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 262         case V4L2_CID_AUDIO_VOLUME:
 263                 return v4l2_ctrl_query_fill(qc, 0, 65535, 2048, 65535);
 264         case V4L2_CID_AUDIO_BASS:
 265         case V4L2_CID_AUDIO_TREBLE:
 266                 return v4l2_ctrl_query_fill(qc, 0, 65535, 4370, 32768);
 267         }
 268         return -EINVAL;
 269 }
 270
 271 static int vidioc_g_ctrl(struct file *file, void *priv,
 272                                 struct v4l2_control *ctrl)
 273 {
 274         struct trust *tr = video_drvdata(file);
 275
 276         switch (ctrl->id) {
 277         case V4L2_CID_AUDIO_MUTE:
 278                 ctrl->value = tr->curmute;
 279                 return 0;
 280         case V4L2_CID_AUDIO_VOLUME:
 281                 ctrl->value = tr->curvol * 2048;
 282                 return 0;
 283         case V4L2_CID_AUDIO_BASS:
 284                 ctrl->value = tr->curbass * 4370;
 285                 return 0;
 286         case V4L2_CID_AUDIO_TREBLE:
 287                 ctrl->value = tr->curtreble * 4370;
 288                 return 0;
 289         }
 290         return -EINVAL;
 291 }
 292
 293 static int vidioc_s_ctrl(struct file *file, void *priv,
 294                                 struct v4l2_control *ctrl)
 295 {
 296         struct trust *tr = video_drvdata(file);
 297
 298         switch (ctrl->id) {
 299         case V4L2_CID_AUDIO_MUTE:
 300                 tr_setmute(tr, ctrl->value);
 301                 return 0;
 302         case V4L2_CID_AUDIO_VOLUME:
 303                 tr_setvol(tr, ctrl->value);
 304                 return 0;
 305         case V4L2_CID_AUDIO_BASS:
 306                 tr_setbass(tr, ctrl->value);
 307                 return 0;
 308         case V4L2_CID_AUDIO_TREBLE:
 309                 tr_settreble(tr, ctrl->value);
 310                 return 0;
 311         }
 312         return -EINVAL;
 313 }
 314
 315 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 316 {
 317         *i = 0;
 318         return 0;
 319 }
 320
 321 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 322 {
 323         return i ? -EINVAL : 0;
 324 }
 325
 326 static int vidioc_g_audio(struct file *file, void *priv,
 327                                 struct v4l2_audio *a)
 328 {
 329         a->index = 0;
 330         strlcpy(a->name, "Radio", sizeof(a->name));
 331         a->capability = V4L2_AUDCAP_STEREO;
 332         return 0;
 333 }
 334
 335 static int vidioc_s_audio(struct file *file, void *priv,
 336                                 struct v4l2_audio *a)
 337 {
 338         return a->index ? -EINVAL : 0;
 339 }
 340
 341 static const struct v4l2_file_operations trust_fops = {
 342         .owner          = THIS_MODULE,
 343         .ioctl          = video_ioctl2,
 344 };
 345
 346 static const struct v4l2_ioctl_ops trust_ioctl_ops = {
 347         .vidioc_querycap    = vidioc_querycap,
 348         .vidioc_g_tuner     = vidioc_g_tuner,
 349         .vidioc_s_tuner     = vidioc_s_tuner,
 350         .vidioc_g_frequency = vidioc_g_frequency,
 351         .vidioc_s_frequency = vidioc_s_frequency,
 352         .vidioc_queryctrl   = vidioc_queryctrl,
 353         .vidioc_g_ctrl      = vidioc_g_ctrl,
 354         .vidioc_s_ctrl      = vidioc_s_ctrl,
 355         .vidioc_g_audio     = vidioc_g_audio,
 356         .vidioc_s_audio     = vidioc_s_audio,
 357         .vidioc_g_input     = vidioc_g_input,
 358         .vidioc_s_input     = vidioc_s_input,
 359 };
 360
 361 static int __init trust_init(void)
 362 {
 363         struct trust *tr = &trust_card;
 364         struct v4l2_device *v4l2_dev = &tr->v4l2_dev;
 365         int res;
 366
 367         strlcpy(v4l2_dev->name, "trust", sizeof(v4l2_dev->name));
 368         tr->io = io;
 369         tr->ioval = 0xf;
 370         mutex_init(&tr->lock);
 371
 372         if (tr->io == -1) {
 373                 v4l2_err(v4l2_dev, "You must set an I/O address with io=0x0x350 or 0x358\n");
 374                 return -EINVAL;
 375         }
 376         if (!request_region(tr->io, 2, "Trust FM Radio")) {
 377                 v4l2_err(v4l2_dev, "port 0x%x already in use\n", tr->io);
 378                 return -EBUSY;
 379         }
 380
 381         res = v4l2_device_register(NULL, v4l2_dev);
 382         if (res < 0) {
 383                 release_region(tr->io, 2);
 384                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 385                 return res;
 386         }
 387
 388         strlcpy(tr->vdev.name, v4l2_dev->name, sizeof(tr->vdev.name));
 389         tr->vdev.v4l2_dev = v4l2_dev;
 390         tr->vdev.fops = &trust_fops;
 391         tr->vdev.ioctl_ops = &trust_ioctl_ops;
 392         tr->vdev.release = video_device_release_empty;
 393         video_set_drvdata(&tr->vdev, tr);
 394
 395         if (video_register_device(&tr->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 396                 v4l2_device_unregister(v4l2_dev);
 397                 release_region(tr->io, 2);
 398                 return -EINVAL;
 399         }
 400
 401         v4l2_info(v4l2_dev, "Trust FM Radio card driver v1.0.\n");
 402
 403         write_i2c(tr, 2, TDA7318_ADDR, 0x80);   /* speaker att. LF = 0 dB */
 404         write_i2c(tr, 2, TDA7318_ADDR, 0xa0);   /* speaker att. RF = 0 dB */
 405         write_i2c(tr, 2, TDA7318_ADDR, 0xc0);   /* speaker att. LR = 0 dB */
 406         write_i2c(tr, 2, TDA7318_ADDR, 0xe0);   /* speaker att. RR = 0 dB */
 407         write_i2c(tr, 2, TDA7318_ADDR, 0x40);   /* stereo 1 input, gain = 18.75 dB */
 408
 409         tr_setvol(tr, 0xffff);
 410         tr_setbass(tr, 0x8000);
 411         tr_settreble(tr, 0x8000);
 412         tr_setstereo(tr, 1);
 413
 414         /* mute card - prevents noisy bootups */
 415         tr_setmute(tr, 1);
 416
 417         return 0;
 418 }
 419
 420 static void __exit cleanup_trust_module(void)
 421 {
 422         struct trust *tr = &trust_card;
 423
 424         video_unregister_device(&tr->vdev);
 425         v4l2_device_unregister(&tr->v4l2_dev);
 426         release_region(tr->io, 2);
 427 }
 428
 429 module_init(trust_init);
 430 module_exit(cleanup_trust_module);