linux/drivers/media/radio/radio-rtrack2.c
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   1/* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
   2 *
   3 * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
   4 * Converted to new API by Alan Cox <alan@lxorguk.ukuu.org.uk>
   5 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
   6 *
   7 * TODO: Allow for more than one of these foolish entities :-)
   8 *
   9 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  10 */
  11
  12#include <linux/module.h>       /* Modules                      */
  13#include <linux/init.h>         /* Initdata                     */
  14#include <linux/ioport.h>       /* request_region               */
  15#include <linux/delay.h>        /* udelay                       */
  16#include <linux/videodev2.h>    /* kernel radio structs         */
  17#include <linux/mutex.h>
  18#include <linux/io.h>           /* outb, outb_p                 */
  19#include <media/v4l2-device.h>
  20#include <media/v4l2-ioctl.h>
  21
  22MODULE_AUTHOR("Ben Pfaff");
  23MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
  24MODULE_LICENSE("GPL");
  25MODULE_VERSION("0.0.3");
  26
  27#ifndef CONFIG_RADIO_RTRACK2_PORT
  28#define CONFIG_RADIO_RTRACK2_PORT -1
  29#endif
  30
  31static int io = CONFIG_RADIO_RTRACK2_PORT;
  32static int radio_nr = -1;
  33
  34module_param(io, int, 0);
  35MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
  36module_param(radio_nr, int, 0);
  37
  38struct rtrack2
  39{
  40        struct v4l2_device v4l2_dev;
  41        struct video_device vdev;
  42        int io;
  43        unsigned long curfreq;
  44        int muted;
  45        struct mutex lock;
  46};
  47
  48static struct rtrack2 rtrack2_card;
  49
  50
  51/* local things */
  52
  53static void rt_mute(struct rtrack2 *dev)
  54{
  55        if (dev->muted)
  56                return;
  57        mutex_lock(&dev->lock);
  58        outb(1, dev->io);
  59        mutex_unlock(&dev->lock);
  60        dev->muted = 1;
  61}
  62
  63static void rt_unmute(struct rtrack2 *dev)
  64{
  65        if(dev->muted == 0)
  66                return;
  67        mutex_lock(&dev->lock);
  68        outb(0, dev->io);
  69        mutex_unlock(&dev->lock);
  70        dev->muted = 0;
  71}
  72
  73static void zero(struct rtrack2 *dev)
  74{
  75        outb_p(1, dev->io);
  76        outb_p(3, dev->io);
  77        outb_p(1, dev->io);
  78}
  79
  80static void one(struct rtrack2 *dev)
  81{
  82        outb_p(5, dev->io);
  83        outb_p(7, dev->io);
  84        outb_p(5, dev->io);
  85}
  86
  87static int rt_setfreq(struct rtrack2 *dev, unsigned long freq)
  88{
  89        int i;
  90
  91        mutex_lock(&dev->lock);
  92        dev->curfreq = freq;
  93        freq = freq / 200 + 856;
  94
  95        outb_p(0xc8, dev->io);
  96        outb_p(0xc9, dev->io);
  97        outb_p(0xc9, dev->io);
  98
  99        for (i = 0; i < 10; i++)
 100                zero(dev);
 101
 102        for (i = 14; i >= 0; i--)
 103                if (freq & (1 << i))
 104                        one(dev);
 105                else
 106                        zero(dev);
 107
 108        outb_p(0xc8, dev->io);
 109        if (!dev->muted)
 110                outb_p(0, dev->io);
 111
 112        mutex_unlock(&dev->lock);
 113        return 0;
 114}
 115
 116static int vidioc_querycap(struct file *file, void *priv,
 117                                struct v4l2_capability *v)
 118{
 119        strlcpy(v->driver, "radio-rtrack2", sizeof(v->driver));
 120        strlcpy(v->card, "RadioTrack II", sizeof(v->card));
 121        strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 122        v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 123        return 0;
 124}
 125
 126static int vidioc_s_tuner(struct file *file, void *priv,
 127                                struct v4l2_tuner *v)
 128{
 129        return v->index ? -EINVAL : 0;
 130}
 131
 132static int rt_getsigstr(struct rtrack2 *dev)
 133{
 134        int sig = 1;
 135
 136        mutex_lock(&dev->lock);
 137        if (inb(dev->io) & 2)   /* bit set = no signal present  */
 138                sig = 0;
 139        mutex_unlock(&dev->lock);
 140        return sig;
 141}
 142
 143static int vidioc_g_tuner(struct file *file, void *priv,
 144                                struct v4l2_tuner *v)
 145{
 146        struct rtrack2 *rt = video_drvdata(file);
 147
 148        if (v->index > 0)
 149                return -EINVAL;
 150
 151        strlcpy(v->name, "FM", sizeof(v->name));
 152        v->type = V4L2_TUNER_RADIO;
 153        v->rangelow = 88 * 16000;
 154        v->rangehigh = 108 * 16000;
 155        v->rxsubchans = V4L2_TUNER_SUB_MONO;
 156        v->capability = V4L2_TUNER_CAP_LOW;
 157        v->audmode = V4L2_TUNER_MODE_MONO;
 158        v->signal = 0xFFFF * rt_getsigstr(rt);
 159        return 0;
 160}
 161
 162static int vidioc_s_frequency(struct file *file, void *priv,
 163                                struct v4l2_frequency *f)
 164{
 165        struct rtrack2 *rt = video_drvdata(file);
 166
 167        if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 168                return -EINVAL;
 169        rt_setfreq(rt, f->frequency);
 170        return 0;
 171}
 172
 173static int vidioc_g_frequency(struct file *file, void *priv,
 174                                struct v4l2_frequency *f)
 175{
 176        struct rtrack2 *rt = video_drvdata(file);
 177
 178        if (f->tuner != 0)
 179                return -EINVAL;
 180        f->type = V4L2_TUNER_RADIO;
 181        f->frequency = rt->curfreq;
 182        return 0;
 183}
 184
 185static int vidioc_queryctrl(struct file *file, void *priv,
 186                                struct v4l2_queryctrl *qc)
 187{
 188        switch (qc->id) {
 189        case V4L2_CID_AUDIO_MUTE:
 190                return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 191        case V4L2_CID_AUDIO_VOLUME:
 192                return v4l2_ctrl_query_fill(qc, 0, 65535, 65535, 65535);
 193        }
 194        return -EINVAL;
 195}
 196
 197static int vidioc_g_ctrl(struct file *file, void *priv,
 198                                struct v4l2_control *ctrl)
 199{
 200        struct rtrack2 *rt = video_drvdata(file);
 201
 202        switch (ctrl->id) {
 203        case V4L2_CID_AUDIO_MUTE:
 204                ctrl->value = rt->muted;
 205                return 0;
 206        case V4L2_CID_AUDIO_VOLUME:
 207                if (rt->muted)
 208                        ctrl->value = 0;
 209                else
 210                        ctrl->value = 65535;
 211                return 0;
 212        }
 213        return -EINVAL;
 214}
 215
 216static int vidioc_s_ctrl(struct file *file, void *priv,
 217                                struct v4l2_control *ctrl)
 218{
 219        struct rtrack2 *rt = video_drvdata(file);
 220
 221        switch (ctrl->id) {
 222        case V4L2_CID_AUDIO_MUTE:
 223                if (ctrl->value)
 224                        rt_mute(rt);
 225                else
 226                        rt_unmute(rt);
 227                return 0;
 228        case V4L2_CID_AUDIO_VOLUME:
 229                if (ctrl->value)
 230                        rt_unmute(rt);
 231                else
 232                        rt_mute(rt);
 233                return 0;
 234        }
 235        return -EINVAL;
 236}
 237
 238static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 239{
 240        *i = 0;
 241        return 0;
 242}
 243
 244static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 245{
 246        return i ? -EINVAL : 0;
 247}
 248
 249static int vidioc_g_audio(struct file *file, void *priv,
 250                                struct v4l2_audio *a)
 251{
 252        a->index = 0;
 253        strlcpy(a->name, "Radio", sizeof(a->name));
 254        a->capability = V4L2_AUDCAP_STEREO;
 255        return 0;
 256}
 257
 258static int vidioc_s_audio(struct file *file, void *priv,
 259                                struct v4l2_audio *a)
 260{
 261        return a->index ? -EINVAL : 0;
 262}
 263
 264static const struct v4l2_file_operations rtrack2_fops = {
 265        .owner          = THIS_MODULE,
 266        .unlocked_ioctl = video_ioctl2,
 267};
 268
 269static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
 270        .vidioc_querycap    = vidioc_querycap,
 271        .vidioc_g_tuner     = vidioc_g_tuner,
 272        .vidioc_s_tuner     = vidioc_s_tuner,
 273        .vidioc_g_frequency = vidioc_g_frequency,
 274        .vidioc_s_frequency = vidioc_s_frequency,
 275        .vidioc_queryctrl   = vidioc_queryctrl,
 276        .vidioc_g_ctrl      = vidioc_g_ctrl,
 277        .vidioc_s_ctrl      = vidioc_s_ctrl,
 278        .vidioc_g_audio     = vidioc_g_audio,
 279        .vidioc_s_audio     = vidioc_s_audio,
 280        .vidioc_g_input     = vidioc_g_input,
 281        .vidioc_s_input     = vidioc_s_input,
 282};
 283
 284static int __init rtrack2_init(void)
 285{
 286        struct rtrack2 *dev = &rtrack2_card;
 287        struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 288        int res;
 289
 290        strlcpy(v4l2_dev->name, "rtrack2", sizeof(v4l2_dev->name));
 291        dev->io = io;
 292        if (dev->io == -1) {
 293                v4l2_err(v4l2_dev, "You must set an I/O address with io=0x20c or io=0x30c\n");
 294                return -EINVAL;
 295        }
 296        if (!request_region(dev->io, 4, "rtrack2")) {
 297                v4l2_err(v4l2_dev, "port 0x%x already in use\n", dev->io);
 298                return -EBUSY;
 299        }
 300
 301        res = v4l2_device_register(NULL, v4l2_dev);
 302        if (res < 0) {
 303                release_region(dev->io, 4);
 304                v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 305                return res;
 306        }
 307
 308        strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 309        dev->vdev.v4l2_dev = v4l2_dev;
 310        dev->vdev.fops = &rtrack2_fops;
 311        dev->vdev.ioctl_ops = &rtrack2_ioctl_ops;
 312        dev->vdev.release = video_device_release_empty;
 313        video_set_drvdata(&dev->vdev, dev);
 314
 315        /* mute card - prevents noisy bootups */
 316        outb(1, dev->io);
 317        dev->muted = 1;
 318
 319        mutex_init(&dev->lock);
 320        if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 321                v4l2_device_unregister(v4l2_dev);
 322                release_region(dev->io, 4);
 323                return -EINVAL;
 324        }
 325
 326        v4l2_info(v4l2_dev, "AIMSlab Radiotrack II card driver.\n");
 327
 328        return 0;
 329}
 330
 331static void __exit rtrack2_exit(void)
 332{
 333        struct rtrack2 *dev = &rtrack2_card;
 334
 335        video_unregister_device(&dev->vdev);
 336        v4l2_device_unregister(&dev->v4l2_dev);
 337        release_region(dev->io, 4);
 338}
 339
 340module_init(rtrack2_init);
 341module_exit(rtrack2_exit);
 342