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miropcm20-radio.c

/* Miro PCM20 radio driver for Linux radio support
 * (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
 * Thanks to Norberto Pellici for the ACI device interface specification
 * The API part is based on the radiotrack driver by M. Kirkwood
 * This driver relies on the aci mixer (drivers/sound/aci.c)
 * Look there for further info...
 */

/* Revision history:
 *
 *   1998        Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
 *   2000-09-05  Robert Siemer <Robert.Siemer@gmx.de>
 *        removed unfinished volume control (maybe adding it later again)
 *        use OSS-mixer; added stereo control
 */

/* What ever you think about the ACI, version 0x07 is not very well!
 * I can't get frequency, 'tuner status', 'tuner flags' or mute/mono
 * conditions...                Robert
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/videodev.h>
#include <media/v4l2-common.h>
#include "oss/aci.h"
#include "miropcm20-rds-core.h"

static int radio_nr = -1;
module_param(radio_nr, int, 0);

struct pcm20_device {
      unsigned long freq;
      int muted;
      int stereo;
};


static int pcm20_mute(struct pcm20_device *dev, unsigned char mute)
{
      dev->muted = mute;
      return aci_write_cmd(ACI_SET_TUNERMUTE, mute);
}

static int pcm20_stereo(struct pcm20_device *dev, unsigned char stereo)
{
      dev->stereo = stereo;
      return aci_write_cmd(ACI_SET_TUNERMONO, !stereo);
}

static int pcm20_setfreq(struct pcm20_device *dev, unsigned long freq)
{
      unsigned char freql;
      unsigned char freqh;

      dev->freq=freq;

      freq /= 160;
      if (!(aci_version==0x07 || aci_version>=0xb0))
            freq /= 10;  /* I don't know exactly which version
                        * needs this hack */
      freql = freq & 0xff;
      freqh = freq >> 8;

      aci_rds_cmd(RDS_RESET, NULL, 0);
      pcm20_stereo(dev, 1);

      return aci_rw_cmd(ACI_WRITE_TUNE, freql, freqh);
}

static int pcm20_getflags(struct pcm20_device *dev, __u32 *flags, __u16 *signal)
{
      /* okay, check for signal, stereo and rds here... */
      int i;
      unsigned char buf;

      if ((i=aci_rw_cmd(ACI_READ_TUNERSTATION, -1, -1))<0)
            return i;
      pr_debug("check_sig: 0x%x\n", i);
      if (i & 0x80) {
            /* no signal from tuner */
            *flags=0;
            *signal=0;
            return 0;
      } else
            *signal=0xffff;

      if ((i=aci_rw_cmd(ACI_READ_TUNERSTEREO, -1, -1))<0)
            return i;
      if (i & 0x40) {
            *flags=0;
      } else {
            /* stereo */
            *flags=VIDEO_TUNER_STEREO_ON;
            /* I can't see stereo, when forced to mono */
            dev->stereo=1;
      }

      if ((i=aci_rds_cmd(RDS_STATUS, &buf, 1))<0)
            return i;
      if (buf & 1)
            /* RDS available */
            *flags|=VIDEO_TUNER_RDS_ON;
      else
            return 0;

      if ((i=aci_rds_cmd(RDS_RXVALUE, &buf, 1))<0)
            return i;
      pr_debug("rds-signal: %d\n", buf);
      if (buf > 15) {
            printk("miropcm20-radio: RX strengths unexpected high...\n");
            buf=15;
      }
      /* refine signal */
      if ((*signal=SCALE(15, 0xffff, buf))==0)
            *signal = 1;

      return 0;
}

static int pcm20_do_ioctl(struct inode *inode, struct file *file,
                    unsigned int cmd, void *arg)
{
      struct video_device *dev = video_devdata(file);
      struct pcm20_device *pcm20 = dev->priv;
      int i;

      switch(cmd)
      {
            case VIDIOCGCAP:
            {
                  struct video_capability *v = arg;
                  memset(v,0,sizeof(*v));
                  v->type=VID_TYPE_TUNER;
                  strcpy(v->name, "Miro PCM20");
                  v->channels=1;
                  v->audios=1;
                  return 0;
            }
            case VIDIOCGTUNER:
            {
                  struct video_tuner *v = arg;
                  if(v->tuner)      /* Only 1 tuner */
                        return -EINVAL;
                  v->rangelow=87*16000;
                  v->rangehigh=108*16000;
                  pcm20_getflags(pcm20, &v->flags, &v->signal);
                  v->flags|=VIDEO_TUNER_LOW;
                  v->mode=VIDEO_MODE_AUTO;
                  strcpy(v->name, "FM");
                  return 0;
            }
            case VIDIOCSTUNER:
            {
                  struct video_tuner *v = arg;
                  if(v->tuner!=0)
                        return -EINVAL;
                  /* Only 1 tuner so no setting needed ! */
                  return 0;
            }
            case VIDIOCGFREQ:
            {
                  unsigned long *freq = arg;
                  *freq = pcm20->freq;
                  return 0;
            }
            case VIDIOCSFREQ:
            {
                  unsigned long *freq = arg;
                  pcm20->freq = *freq;
                  i=pcm20_setfreq(pcm20, pcm20->freq);
                  pr_debug("First view (setfreq): 0x%x\n", i);
                  return i;
            }
            case VIDIOCGAUDIO:
            {
                  struct video_audio *v = arg;
                  memset(v,0, sizeof(*v));
                  v->flags=VIDEO_AUDIO_MUTABLE;
                  if (pcm20->muted)
                        v->flags|=VIDEO_AUDIO_MUTE;
                  v->mode=VIDEO_SOUND_STEREO;
                  if (pcm20->stereo)
                        v->mode|=VIDEO_SOUND_MONO;
                  /* v->step=2048; */
                  strcpy(v->name, "Radio");
                  return 0;
            }
            case VIDIOCSAUDIO:
            {
                  struct video_audio *v = arg;
                  if(v->audio)
                        return -EINVAL;

                  pcm20_mute(pcm20, !!(v->flags&VIDEO_AUDIO_MUTE));
                  if(v->flags&VIDEO_SOUND_MONO)
                        pcm20_stereo(pcm20, 0);
                  if(v->flags&VIDEO_SOUND_STEREO)
                        pcm20_stereo(pcm20, 1);

                  return 0;
            }
            default:
                  return -ENOIOCTLCMD;
      }
}

static int pcm20_ioctl(struct inode *inode, struct file *file,
                   unsigned int cmd, unsigned long arg)
{
      return video_usercopy(inode, file, cmd, arg, pcm20_do_ioctl);
}

static struct pcm20_device pcm20_unit = {
      .freq   = 87*16000,
      .muted  = 1,
};

static const struct file_operations pcm20_fops = {
      .owner            = THIS_MODULE,
      .open           = video_exclusive_open,
      .release        = video_exclusive_release,
      .ioctl            = pcm20_ioctl,
      .compat_ioctl     = v4l_compat_ioctl32,
      .llseek         = no_llseek,
};

static struct video_device pcm20_radio = {
      .owner            = THIS_MODULE,
      .name       = "Miro PCM 20 radio",
      .type       = VID_TYPE_TUNER,
      .fops           = &pcm20_fops,
      .priv       = &pcm20_unit
};

static int __init pcm20_init(void)
{
      if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO, radio_nr)==-1)
            goto video_register_device;

      if(attach_aci_rds()<0)
            goto attach_aci_rds;

      printk(KERN_INFO "Miro PCM20 radio card driver.\n");

      return 0;

 attach_aci_rds:
      video_unregister_device(&pcm20_radio);
 video_register_device:
      return -EINVAL;
}

MODULE_AUTHOR("Ruurd Reitsma");
MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
MODULE_LICENSE("GPL");

static void __exit pcm20_cleanup(void)
{
      unload_aci_rds();
      video_unregister_device(&pcm20_radio);
}

module_init(pcm20_init);
module_exit(pcm20_cleanup);

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