linux/drivers/media/radio/radio-sf16fmr2.c
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   1/* SF16FMR2 radio driver for Linux radio support
   2 * heavily based on fmi driver...
   3 * (c) 2000-2002 Ziglio Frediano, freddy77@angelfire.com
   4 *
   5 * Notes on the hardware
   6 *
   7 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
   8 *  No volume control - only mute/unmute - you have to use line volume
   9 *
  10 *  For read stereo/mono you must wait 0.1 sec after set frequency and
  11 *  card unmuted so I set frequency on unmute
  12 *  Signal handling seem to work only on autoscanning (not implemented)
  13 *
  14 *  Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  15 */
  16
  17#include <linux/module.h>       /* Modules                      */
  18#include <linux/init.h>         /* Initdata                     */
  19#include <linux/ioport.h>       /* request_region               */
  20#include <linux/delay.h>        /* udelay                       */
  21#include <linux/videodev2.h>    /* kernel radio structs         */
  22#include <linux/mutex.h>
  23#include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  24#include <linux/io.h>           /* outb, outb_p                 */
  25#include <media/v4l2-device.h>
  26#include <media/v4l2-ioctl.h>
  27
  28MODULE_AUTHOR("Ziglio Frediano, freddy77@angelfire.com");
  29MODULE_DESCRIPTION("A driver for the SF16FMR2 radio.");
  30MODULE_LICENSE("GPL");
  31
  32static int io = 0x384;
  33static int radio_nr = -1;
  34
  35module_param(io, int, 0);
  36MODULE_PARM_DESC(io, "I/O address of the SF16FMR2 card (should be 0x384, if do not work try 0x284)");
  37module_param(radio_nr, int, 0);
  38
  39#define RADIO_VERSION KERNEL_VERSION(0,0,2)
  40
  41#define AUD_VOL_INDEX 1
  42
  43#undef DEBUG
  44//#define DEBUG 1
  45
  46#ifdef DEBUG
  47# define  debug_print(s) printk s
  48#else
  49# define  debug_print(s)
  50#endif
  51
  52/* this should be static vars for module size */
  53struct fmr2
  54{
  55        struct v4l2_device v4l2_dev;
  56        struct video_device vdev;
  57        struct mutex lock;
  58        int io;
  59        int curvol; /* 0-15 */
  60        int mute;
  61        int stereo; /* card is producing stereo audio */
  62        unsigned long curfreq; /* freq in kHz */
  63        int card_type;
  64};
  65
  66static struct fmr2 fmr2_card;
  67
  68/* hw precision is 12.5 kHz
  69 * It is only useful to give freq in interval of 200 (=0.0125Mhz),
  70 * other bits will be truncated
  71 */
  72#define RSF16_ENCODE(x) ((x) / 200 + 856)
  73#define RSF16_MINFREQ (87 * 16000)
  74#define RSF16_MAXFREQ (108 * 16000)
  75
  76static inline void wait(int n, int io)
  77{
  78        for (; n; --n)
  79                inb(io);
  80}
  81
  82static void outbits(int bits, unsigned int data, int nWait, int io)
  83{
  84        int bit;
  85
  86        for (; --bits >= 0;) {
  87                bit = (data >> bits) & 1;
  88                outb(bit, io);
  89                wait(nWait, io);
  90                outb(bit | 2, io);
  91                wait(nWait, io);
  92                outb(bit, io);
  93                wait(nWait, io);
  94        }
  95}
  96
  97static inline void fmr2_mute(int io)
  98{
  99        outb(0x00, io);
 100        wait(4, io);
 101}
 102
 103static inline void fmr2_unmute(int io)
 104{
 105        outb(0x04, io);
 106        wait(4, io);
 107}
 108
 109static inline int fmr2_stereo_mode(int io)
 110{
 111        int n = inb(io);
 112
 113        outb(6, io);
 114        inb(io);
 115        n = ((n >> 3) & 1) ^ 1;
 116        debug_print((KERN_DEBUG "stereo: %d\n", n));
 117        return n;
 118}
 119
 120static int fmr2_product_info(struct fmr2 *dev)
 121{
 122        int n = inb(dev->io);
 123
 124        n &= 0xC1;
 125        if (n == 0) {
 126                /* this should support volume set */
 127                dev->card_type = 12;
 128                return 0;
 129        }
 130        /* not volume (mine is 11) */
 131        dev->card_type = (n == 128) ? 11 : 0;
 132        return n;
 133}
 134
 135static inline int fmr2_getsigstr(struct fmr2 *dev)
 136{
 137        /* !!! works only if scanning freq */
 138        int res = 0xffff;
 139
 140        outb(5, dev->io);
 141        wait(4, dev->io);
 142        if (!(inb(dev->io) & 1))
 143                res = 0;
 144        debug_print((KERN_DEBUG "signal: %d\n", res));
 145        return res;
 146}
 147
 148/* set frequency and unmute card */
 149static int fmr2_setfreq(struct fmr2 *dev)
 150{
 151        unsigned long freq = dev->curfreq;
 152
 153        fmr2_mute(dev->io);
 154
 155        /* 0x42 for mono output
 156         * 0x102 forward scanning
 157         * 0x182 scansione avanti
 158         */
 159        outbits(9, 0x2, 3, dev->io);
 160        outbits(16, RSF16_ENCODE(freq), 2, dev->io);
 161
 162        fmr2_unmute(dev->io);
 163
 164        /* wait 0.11 sec */
 165        msleep(110);
 166
 167        /* NOTE if mute this stop radio
 168           you must set freq on unmute */
 169        dev->stereo = fmr2_stereo_mode(dev->io);
 170        return 0;
 171}
 172
 173/* !!! not tested, in my card this doesn't work !!! */
 174static int fmr2_setvolume(struct fmr2 *dev)
 175{
 176        int vol[16] = { 0x021, 0x084, 0x090, 0x104,
 177                        0x110, 0x204, 0x210, 0x402,
 178                        0x404, 0x408, 0x410, 0x801,
 179                        0x802, 0x804, 0x808, 0x810 };
 180        int i, a;
 181        int n = vol[dev->curvol & 0x0f];
 182
 183        if (dev->card_type != 11)
 184                return 1;
 185
 186        for (i = 12; --i >= 0; ) {
 187                a = ((n >> i) & 1) << 6; /* if (a==0) a = 0; else a = 0x40; */
 188                outb(a | 4, dev->io);
 189                wait(4, dev->io);
 190                outb(a | 0x24, dev->io);
 191                wait(4, dev->io);
 192                outb(a | 4, dev->io);
 193                wait(4, dev->io);
 194        }
 195        for (i = 6; --i >= 0; ) {
 196                a = ((0x18 >> i) & 1) << 6;
 197                outb(a | 4, dev->io);
 198                wait(4, dev->io);
 199                outb(a | 0x24, dev->io);
 200                wait(4, dev->io);
 201                outb(a | 4, dev->io);
 202                wait(4, dev->io);
 203        }
 204        wait(4, dev->io);
 205        outb(0x14, dev->io);
 206        return 0;
 207}
 208
 209static int vidioc_querycap(struct file *file, void  *priv,
 210                                        struct v4l2_capability *v)
 211{
 212        strlcpy(v->driver, "radio-sf16fmr2", sizeof(v->driver));
 213        strlcpy(v->card, "SF16-FMR2 radio", sizeof(v->card));
 214        strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 215        v->version = RADIO_VERSION;
 216        v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 217        return 0;
 218}
 219
 220static int vidioc_g_tuner(struct file *file, void *priv,
 221                                        struct v4l2_tuner *v)
 222{
 223        struct fmr2 *fmr2 = video_drvdata(file);
 224
 225        if (v->index > 0)
 226                return -EINVAL;
 227
 228        strlcpy(v->name, "FM", sizeof(v->name));
 229        v->type = V4L2_TUNER_RADIO;
 230
 231        v->rangelow = RSF16_MINFREQ;
 232        v->rangehigh = RSF16_MAXFREQ;
 233        v->rxsubchans = fmr2->stereo ? V4L2_TUNER_SUB_STEREO :
 234                                        V4L2_TUNER_SUB_MONO;
 235        v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
 236        v->audmode = V4L2_TUNER_MODE_STEREO;
 237        mutex_lock(&fmr2->lock);
 238        v->signal = fmr2_getsigstr(fmr2);
 239        mutex_unlock(&fmr2->lock);
 240        return 0;
 241}
 242
 243static int vidioc_s_tuner(struct file *file, void *priv,
 244                                        struct v4l2_tuner *v)
 245{
 246        return v->index ? -EINVAL : 0;
 247}
 248
 249static int vidioc_s_frequency(struct file *file, void *priv,
 250                                        struct v4l2_frequency *f)
 251{
 252        struct fmr2 *fmr2 = video_drvdata(file);
 253
 254        if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 255                return -EINVAL;
 256        if (f->frequency < RSF16_MINFREQ ||
 257                        f->frequency > RSF16_MAXFREQ)
 258                return -EINVAL;
 259        /* rounding in steps of 200 to match the freq
 260           that will be used */
 261        fmr2->curfreq = (f->frequency / 200) * 200;
 262
 263        /* set card freq (if not muted) */
 264        if (fmr2->curvol && !fmr2->mute) {
 265                mutex_lock(&fmr2->lock);
 266                fmr2_setfreq(fmr2);
 267                mutex_unlock(&fmr2->lock);
 268        }
 269        return 0;
 270}
 271
 272static int vidioc_g_frequency(struct file *file, void *priv,
 273                                        struct v4l2_frequency *f)
 274{
 275        struct fmr2 *fmr2 = video_drvdata(file);
 276
 277        if (f->tuner != 0)
 278                return -EINVAL;
 279        f->type = V4L2_TUNER_RADIO;
 280        f->frequency = fmr2->curfreq;
 281        return 0;
 282}
 283
 284static int vidioc_queryctrl(struct file *file, void *priv,
 285                                        struct v4l2_queryctrl *qc)
 286{
 287        struct fmr2 *fmr2 = video_drvdata(file);
 288
 289        switch (qc->id) {
 290        case V4L2_CID_AUDIO_MUTE:
 291                return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 292        case V4L2_CID_AUDIO_VOLUME:
 293                /* Only card_type == 11 implements volume */
 294                if (fmr2->card_type == 11)
 295                        return v4l2_ctrl_query_fill(qc, 0, 15, 1, 0);
 296                return v4l2_ctrl_query_fill(qc, 0, 1, 1, 0);
 297        }
 298        return -EINVAL;
 299}
 300
 301static int vidioc_g_ctrl(struct file *file, void *priv,
 302                                        struct v4l2_control *ctrl)
 303{
 304        struct fmr2 *fmr2 = video_drvdata(file);
 305
 306        switch (ctrl->id) {
 307        case V4L2_CID_AUDIO_MUTE:
 308                ctrl->value = fmr2->mute;
 309                return 0;
 310        case V4L2_CID_AUDIO_VOLUME:
 311                ctrl->value = fmr2->curvol;
 312                return 0;
 313        }
 314        return -EINVAL;
 315}
 316
 317static int vidioc_s_ctrl(struct file *file, void *priv,
 318                                        struct v4l2_control *ctrl)
 319{
 320        struct fmr2 *fmr2 = video_drvdata(file);
 321
 322        switch (ctrl->id) {
 323        case V4L2_CID_AUDIO_MUTE:
 324                fmr2->mute = ctrl->value;
 325                break;
 326        case V4L2_CID_AUDIO_VOLUME:
 327                fmr2->curvol = ctrl->value;
 328                break;
 329        default:
 330                return -EINVAL;
 331        }
 332
 333#ifdef DEBUG
 334        if (fmr2->curvol && !fmr2->mute)
 335                printk(KERN_DEBUG "unmute\n");
 336        else
 337                printk(KERN_DEBUG "mute\n");
 338#endif
 339
 340        mutex_lock(&fmr2->lock);
 341        if (fmr2->curvol && !fmr2->mute) {
 342                fmr2_setvolume(fmr2);
 343                /* Set frequency and unmute card */
 344                fmr2_setfreq(fmr2);
 345        } else
 346                fmr2_mute(fmr2->io);
 347        mutex_unlock(&fmr2->lock);
 348        return 0;
 349}
 350
 351static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 352{
 353        *i = 0;
 354        return 0;
 355}
 356
 357static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 358{
 359        return i ? -EINVAL : 0;
 360}
 361
 362static int vidioc_g_audio(struct file *file, void *priv,
 363                                        struct v4l2_audio *a)
 364{
 365        a->index = 0;
 366        strlcpy(a->name, "Radio", sizeof(a->name));
 367        a->capability = V4L2_AUDCAP_STEREO;
 368        return 0;
 369}
 370
 371static int vidioc_s_audio(struct file *file, void *priv,
 372                                        struct v4l2_audio *a)
 373{
 374        return a->index ? -EINVAL : 0;
 375}
 376
 377static const struct v4l2_file_operations fmr2_fops = {
 378        .owner          = THIS_MODULE,
 379        .unlocked_ioctl = video_ioctl2,
 380};
 381
 382static const struct v4l2_ioctl_ops fmr2_ioctl_ops = {
 383        .vidioc_querycap    = vidioc_querycap,
 384        .vidioc_g_tuner     = vidioc_g_tuner,
 385        .vidioc_s_tuner     = vidioc_s_tuner,
 386        .vidioc_g_audio     = vidioc_g_audio,
 387        .vidioc_s_audio     = vidioc_s_audio,
 388        .vidioc_g_input     = vidioc_g_input,
 389        .vidioc_s_input     = vidioc_s_input,
 390        .vidioc_g_frequency = vidioc_g_frequency,
 391        .vidioc_s_frequency = vidioc_s_frequency,
 392        .vidioc_queryctrl   = vidioc_queryctrl,
 393        .vidioc_g_ctrl      = vidioc_g_ctrl,
 394        .vidioc_s_ctrl      = vidioc_s_ctrl,
 395};
 396
 397static int __init fmr2_init(void)
 398{
 399        struct fmr2 *fmr2 = &fmr2_card;
 400        struct v4l2_device *v4l2_dev = &fmr2->v4l2_dev;
 401        int res;
 402
 403        strlcpy(v4l2_dev->name, "sf16fmr2", sizeof(v4l2_dev->name));
 404        fmr2->io = io;
 405        fmr2->stereo = 1;
 406        mutex_init(&fmr2->lock);
 407
 408        if (!request_region(fmr2->io, 2, "sf16fmr2")) {
 409                v4l2_err(v4l2_dev, "request_region failed!\n");
 410                return -EBUSY;
 411        }
 412
 413        res = v4l2_device_register(NULL, v4l2_dev);
 414        if (res < 0) {
 415                release_region(fmr2->io, 2);
 416                v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 417                return res;
 418        }
 419
 420        strlcpy(fmr2->vdev.name, v4l2_dev->name, sizeof(fmr2->vdev.name));
 421        fmr2->vdev.v4l2_dev = v4l2_dev;
 422        fmr2->vdev.fops = &fmr2_fops;
 423        fmr2->vdev.ioctl_ops = &fmr2_ioctl_ops;
 424        fmr2->vdev.release = video_device_release_empty;
 425        video_set_drvdata(&fmr2->vdev, fmr2);
 426
 427        /* mute card - prevents noisy bootups */
 428        fmr2_mute(fmr2->io);
 429        fmr2_product_info(fmr2);
 430
 431        if (video_register_device(&fmr2->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 432                v4l2_device_unregister(v4l2_dev);
 433                release_region(fmr2->io, 2);
 434                return -EINVAL;
 435        }
 436
 437        v4l2_info(v4l2_dev, "SF16FMR2 radio card driver at 0x%x.\n", fmr2->io);
 438        debug_print((KERN_DEBUG "card_type %d\n", fmr2->card_type));
 439        return 0;
 440}
 441
 442static void __exit fmr2_exit(void)
 443{
 444        struct fmr2 *fmr2 = &fmr2_card;
 445
 446        video_unregister_device(&fmr2->vdev);
 447        v4l2_device_unregister(&fmr2->v4l2_dev);
 448        release_region(fmr2->io, 2);
 449}
 450
 451module_init(fmr2_init);
 452module_exit(fmr2_exit);
 453
 454#ifndef MODULE
 455
 456static int __init fmr2_setup_io(char *str)
 457{
 458        get_option(&str, &io);
 459        return 1;
 460}
 461
 462__setup("sf16fmr2=", fmr2_setup_io);
 463
 464#endif
 465