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/videodev2.h>
  23 #include <linux/io.h>
  24 #include <media/v4l2-device.h>
  25 #include <media/v4l2-ioctl.h>
  26
  27 MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
  28 MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
  29 MODULE_LICENSE("GPL");
  30 MODULE_VERSION("0.0.3");
  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 struct trust {
  46         struct v4l2_device v4l2_dev;
  47         struct video_device vdev;
  48         int io;
  49         int ioval;
  50         __u16 curvol;
  51         __u16 curbass;
  52         __u16 curtreble;
  53         int muted;
  54         unsigned long curfreq;
  55         int curstereo;
  56         int curmute;
  57         struct mutex lock;
  58 };
  59
  60 static struct trust trust_card;
  61
  62 /* i2c addresses */
  63 #define TDA7318_ADDR 0x88
  64 #define TSA6060T_ADDR 0xc4
  65
  66 #define TR_DELAY do { inb(tr->io); inb(tr->io); inb(tr->io); } while (0)
  67 #define TR_SET_SCL outb(tr->ioval |= 2, tr->io)
  68 #define TR_CLR_SCL outb(tr->ioval &= 0xfd, tr->io)
  69 #define TR_SET_SDA outb(tr->ioval |= 1, tr->io)
  70 #define TR_CLR_SDA outb(tr->ioval &= 0xfe, tr->io)
  71
  72 static void write_i2c(struct trust *tr, int n, ...)
  73 {
  74         unsigned char val, mask;
  75         va_list args;
  76
  77         va_start(args, n);
  78
  79         /* start condition */
  80         TR_SET_SDA;
  81         TR_SET_SCL;
  82         TR_DELAY;
  83         TR_CLR_SDA;
  84         TR_CLR_SCL;
  85         TR_DELAY;
  86
  87         for(; n; n--) {
  88                 val = va_arg(args, unsigned);
  89                 for(mask = 0x80; mask; mask >>= 1) {
  90                         if(val & mask)
  91                                 TR_SET_SDA;
  92                         else
  93                                 TR_CLR_SDA;
  94                         TR_SET_SCL;
  95                         TR_DELAY;
  96                         TR_CLR_SCL;
  97                         TR_DELAY;
  98                 }
  99                 /* acknowledge bit */
 100                 TR_SET_SDA;
 101                 TR_SET_SCL;
 102                 TR_DELAY;
 103                 TR_CLR_SCL;
 104                 TR_DELAY;
 105         }
 106
 107         /* stop condition */
 108         TR_CLR_SDA;
 109         TR_DELAY;
 110         TR_SET_SCL;
 111         TR_DELAY;
 112         TR_SET_SDA;
 113         TR_DELAY;
 114
 115         va_end(args);
 116 }
 117
 118 static void tr_setvol(struct trust *tr, __u16 vol)
 119 {
 120         mutex_lock(&tr->lock);
 121         tr->curvol = vol / 2048;
 122         write_i2c(tr, 2, TDA7318_ADDR, tr->curvol ^ 0x1f);
 123         mutex_unlock(&tr->lock);
 124 }
 125
 126 static int basstreble2chip[15] = {
 127         0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
 128 };
 129
 130 static void tr_setbass(struct trust *tr, __u16 bass)
 131 {
 132         mutex_lock(&tr->lock);
 133         tr->curbass = bass / 4370;
 134         write_i2c(tr, 2, TDA7318_ADDR, 0x60 | basstreble2chip[tr->curbass]);
 135         mutex_unlock(&tr->lock);
 136 }
 137
 138 static void tr_settreble(struct trust *tr, __u16 treble)
 139 {
 140         mutex_lock(&tr->lock);
 141         tr->curtreble = treble / 4370;
 142         write_i2c(tr, 2, TDA7318_ADDR, 0x70 | basstreble2chip[tr->curtreble]);
 143         mutex_unlock(&tr->lock);
 144 }
 145
 146 static void tr_setstereo(struct trust *tr, int stereo)
 147 {
 148         mutex_lock(&tr->lock);
 149         tr->curstereo = !!stereo;
 150         tr->ioval = (tr->ioval & 0xfb) | (!tr->curstereo << 2);
 151         outb(tr->ioval, tr->io);
 152         mutex_unlock(&tr->lock);
 153 }
 154
 155 static void tr_setmute(struct trust *tr, int mute)
 156 {
 157         mutex_lock(&tr->lock);
 158         tr->curmute = !!mute;
 159         tr->ioval = (tr->ioval & 0xf7) | (tr->curmute << 3);
 160         outb(tr->ioval, tr->io);
 161         mutex_unlock(&tr->lock);
 162 }
 163
 164 static int tr_getsigstr(struct trust *tr)
 165 {
 166         int i, v;
 167
 168         mutex_lock(&tr->lock);
 169         for (i = 0, v = 0; i < 100; i++)
 170                 v |= inb(tr->io);
 171         mutex_unlock(&tr->lock);
 172         return (v & 1) ? 0 : 0xffff;
 173 }
 174
 175 static int tr_getstereo(struct trust *tr)
 176 {
 177         /* don't know how to determine it, just return the setting */
 178         return tr->curstereo;
 179 }
 180
 181 static void tr_setfreq(struct trust *tr, unsigned long f)
 182 {
 183         mutex_lock(&tr->lock);
 184         tr->curfreq = f;
 185         f /= 160;       /* Convert to 10 kHz units      */
 186         f += 1070;      /* Add 10.7 MHz IF              */
 187         write_i2c(tr, 5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
 188         mutex_unlock(&tr->lock);
 189 }
 190
 191 static int vidioc_querycap(struct file *file, void *priv,
 192                                 struct v4l2_capability *v)
 193 {
 194         strlcpy(v->driver, "radio-trust", sizeof(v->driver));
 195         strlcpy(v->card, "Trust FM Radio", sizeof(v->card));
 196         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 197         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 198         return 0;
 199 }
 200
 201 static int vidioc_g_tuner(struct file *file, void *priv,
 202                                 struct v4l2_tuner *v)
 203 {
 204         struct trust *tr = video_drvdata(file);
 205
 206         if (v->index > 0)
 207                 return -EINVAL;
 208
 209         strlcpy(v->name, "FM", sizeof(v->name));
 210         v->type = V4L2_TUNER_RADIO;
 211         v->rangelow = 87.5 * 16000;
 212         v->rangehigh = 108 * 16000;
 213         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 214         v->capability = V4L2_TUNER_CAP_LOW;
 215         if (tr_getstereo(tr))
 216                 v->audmode = V4L2_TUNER_MODE_STEREO;
 217         else
 218                 v->audmode = V4L2_TUNER_MODE_MONO;
 219         v->signal = tr_getsigstr(tr);
 220         return 0;
 221 }
 222
 223 static int vidioc_s_tuner(struct file *file, void *priv,
 224                                 struct v4l2_tuner *v)
 225 {
 226         struct trust *tr = video_drvdata(file);
 227
 228         if (v->index)
 229                 return -EINVAL;
 230         tr_setstereo(tr, v->audmode == V4L2_TUNER_MODE_STEREO);
 231         return 0;
 232 }
 233
 234 static int vidioc_s_frequency(struct file *file, void *priv,
 235                                 struct v4l2_frequency *f)
 236 {
 237         struct trust *tr = video_drvdata(file);
 238
 239         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 240                 return -EINVAL;
 241         tr_setfreq(tr, f->frequency);
 242         return 0;
 243 }
 244
 245 static int vidioc_g_frequency(struct file *file, void *priv,
 246                                 struct v4l2_frequency *f)
 247 {
 248         struct trust *tr = video_drvdata(file);
 249
 250         if (f->tuner != 0)
 251                 return -EINVAL;
 252         f->type = V4L2_TUNER_RADIO;
 253         f->frequency = tr->curfreq;
 254         return 0;
 255 }
 256
 257 static int vidioc_queryctrl(struct file *file, void *priv,
 258                                 struct v4l2_queryctrl *qc)
 259 {
 260         switch (qc->id) {
 261         case V4L2_CID_AUDIO_MUTE:
 262                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 263         case V4L2_CID_AUDIO_VOLUME:
 264                 return v4l2_ctrl_query_fill(qc, 0, 65535, 2048, 65535);
 265         case V4L2_CID_AUDIO_BASS:
 266         case V4L2_CID_AUDIO_TREBLE:
 267                 return v4l2_ctrl_query_fill(qc, 0, 65535, 4370, 32768);
 268         }
 269         return -EINVAL;
 270 }
 271
 272 static int vidioc_g_ctrl(struct file *file, void *priv,
 273                                 struct v4l2_control *ctrl)
 274 {
 275         struct trust *tr = video_drvdata(file);
 276
 277         switch (ctrl->id) {
 278         case V4L2_CID_AUDIO_MUTE:
 279                 ctrl->value = tr->curmute;
 280                 return 0;
 281         case V4L2_CID_AUDIO_VOLUME:
 282                 ctrl->value = tr->curvol * 2048;
 283                 return 0;
 284         case V4L2_CID_AUDIO_BASS:
 285                 ctrl->value = tr->curbass * 4370;
 286                 return 0;
 287         case V4L2_CID_AUDIO_TREBLE:
 288                 ctrl->value = tr->curtreble * 4370;
 289                 return 0;
 290         }
 291         return -EINVAL;
 292 }
 293
 294 static int vidioc_s_ctrl(struct file *file, void *priv,
 295                                 struct v4l2_control *ctrl)
 296 {
 297         struct trust *tr = video_drvdata(file);
 298
 299         switch (ctrl->id) {
 300         case V4L2_CID_AUDIO_MUTE:
 301                 tr_setmute(tr, ctrl->value);
 302                 return 0;
 303         case V4L2_CID_AUDIO_VOLUME:
 304                 tr_setvol(tr, ctrl->value);
 305                 return 0;
 306         case V4L2_CID_AUDIO_BASS:
 307                 tr_setbass(tr, ctrl->value);
 308                 return 0;
 309         case V4L2_CID_AUDIO_TREBLE:
 310                 tr_settreble(tr, ctrl->value);
 311                 return 0;
 312         }
 313         return -EINVAL;
 314 }
 315
 316 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 317 {
 318         *i = 0;
 319         return 0;
 320 }
 321
 322 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 323 {
 324         return i ? -EINVAL : 0;
 325 }
 326
 327 static int vidioc_g_audio(struct file *file, void *priv,
 328                                 struct v4l2_audio *a)
 329 {
 330         a->index = 0;
 331         strlcpy(a->name, "Radio", sizeof(a->name));
 332         a->capability = V4L2_AUDCAP_STEREO;
 333         return 0;
 334 }
 335
 336 static int vidioc_s_audio(struct file *file, void *priv,
 337                                 struct v4l2_audio *a)
 338 {
 339         return a->index ? -EINVAL : 0;
 340 }
 341
 342 static const struct v4l2_file_operations trust_fops = {
 343         .owner          = THIS_MODULE,
 344         .unlocked_ioctl = video_ioctl2,
 345 };
 346
 347 static const struct v4l2_ioctl_ops trust_ioctl_ops = {
 348         .vidioc_querycap    = vidioc_querycap,
 349         .vidioc_g_tuner     = vidioc_g_tuner,
 350         .vidioc_s_tuner     = vidioc_s_tuner,
 351         .vidioc_g_frequency = vidioc_g_frequency,
 352         .vidioc_s_frequency = vidioc_s_frequency,
 353         .vidioc_queryctrl   = vidioc_queryctrl,
 354         .vidioc_g_ctrl      = vidioc_g_ctrl,
 355         .vidioc_s_ctrl      = vidioc_s_ctrl,
 356         .vidioc_g_audio     = vidioc_g_audio,
 357         .vidioc_s_audio     = vidioc_s_audio,
 358         .vidioc_g_input     = vidioc_g_input,
 359         .vidioc_s_input     = vidioc_s_input,
 360 };
 361
 362 static int __init trust_init(void)
 363 {
 364         struct trust *tr = &trust_card;
 365         struct v4l2_device *v4l2_dev = &tr->v4l2_dev;
 366         int res;
 367
 368         strlcpy(v4l2_dev->name, "trust", sizeof(v4l2_dev->name));
 369         tr->io = io;
 370         tr->ioval = 0xf;
 371         mutex_init(&tr->lock);
 372
 373         if (tr->io == -1) {
 374                 v4l2_err(v4l2_dev, "You must set an I/O address with io=0x0x350 or 0x358\n");
 375                 return -EINVAL;
 376         }
 377         if (!request_region(tr->io, 2, "Trust FM Radio")) {
 378                 v4l2_err(v4l2_dev, "port 0x%x already in use\n", tr->io);
 379                 return -EBUSY;
 380         }
 381
 382         res = v4l2_device_register(NULL, v4l2_dev);
 383         if (res < 0) {
 384                 release_region(tr->io, 2);
 385                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 386                 return res;
 387         }
 388
 389         strlcpy(tr->vdev.name, v4l2_dev->name, sizeof(tr->vdev.name));
 390         tr->vdev.v4l2_dev = v4l2_dev;
 391         tr->vdev.fops = &trust_fops;
 392         tr->vdev.ioctl_ops = &trust_ioctl_ops;
 393         tr->vdev.release = video_device_release_empty;
 394         video_set_drvdata(&tr->vdev, tr);
 395
 396         write_i2c(tr, 2, TDA7318_ADDR, 0x80);   /* speaker att. LF = 0 dB */
 397         write_i2c(tr, 2, TDA7318_ADDR, 0xa0);   /* speaker att. RF = 0 dB */
 398         write_i2c(tr, 2, TDA7318_ADDR, 0xc0);   /* speaker att. LR = 0 dB */
 399         write_i2c(tr, 2, TDA7318_ADDR, 0xe0);   /* speaker att. RR = 0 dB */
 400         write_i2c(tr, 2, TDA7318_ADDR, 0x40);   /* stereo 1 input, gain = 18.75 dB */
 401
 402         tr_setvol(tr, 0xffff);
 403         tr_setbass(tr, 0x8000);
 404         tr_settreble(tr, 0x8000);
 405         tr_setstereo(tr, 1);
 406
 407         /* mute card - prevents noisy bootups */
 408         tr_setmute(tr, 1);
 409
 410         if (video_register_device(&tr->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 411                 v4l2_device_unregister(v4l2_dev);
 412                 release_region(tr->io, 2);
 413                 return -EINVAL;
 414         }
 415
 416         v4l2_info(v4l2_dev, "Trust FM Radio card driver v1.0.\n");
 417
 418         return 0;
 419 }
 420
 421 static void __exit cleanup_trust_module(void)
 422 {
 423         struct trust *tr = &trust_card;
 424
 425         video_unregister_device(&tr->vdev);
 426         v4l2_device_unregister(&tr->v4l2_dev);
 427         release_region(tr->io, 2);
 428 }
 429
 430 module_init(trust_init);
 431 module_exit(cleanup_trust_module);