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radio-rtrack2.c

/* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
 *
 * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
 * Converted to new API by Alan Cox <Alan.Cox@linux.org>
 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
 *
 * TODO: Allow for more than one of these foolish entities :-)
 *
 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
 */

#include <linux/module.h>     /* Modules              */
#include <linux/init.h>       /* Initdata             */
#include <linux/ioport.h>     /* request_region       */
#include <linux/delay.h>      /* udelay               */
#include <asm/io.h>           /* outb, outb_p               */
#include <asm/uaccess.h>      /* copy to/from user          */
#include <linux/videodev2.h>  /* kernel radio structs       */
#include <media/v4l2-common.h>
#include <linux/spinlock.h>

#include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
#define RADIO_VERSION KERNEL_VERSION(0,0,2)

static struct v4l2_queryctrl radio_qctrl[] = {
      {
            .id            = V4L2_CID_AUDIO_MUTE,
            .name          = "Mute",
            .minimum       = 0,
            .maximum       = 1,
            .default_value = 1,
            .type          = V4L2_CTRL_TYPE_BOOLEAN,
      },{
            .id            = V4L2_CID_AUDIO_VOLUME,
            .name          = "Volume",
            .minimum       = 0,
            .maximum       = 65535,
            .step          = 65535,
            .default_value = 0xff,
            .type          = V4L2_CTRL_TYPE_INTEGER,
      }
};

#ifndef CONFIG_RADIO_RTRACK2_PORT
#define CONFIG_RADIO_RTRACK2_PORT -1
#endif

static int io = CONFIG_RADIO_RTRACK2_PORT;
static int radio_nr = -1;
static spinlock_t lock;

struct rt_device
{
      int port;
      unsigned long curfreq;
      int muted;
};


/* local things */

static void rt_mute(struct rt_device *dev)
{
      if(dev->muted)
            return;
      spin_lock(&lock);
      outb(1, io);
      spin_unlock(&lock);
      dev->muted = 1;
}

static void rt_unmute(struct rt_device *dev)
{
      if(dev->muted == 0)
            return;
      spin_lock(&lock);
      outb(0, io);
      spin_unlock(&lock);
      dev->muted = 0;
}

static void zero(void)
{
      outb_p(1, io);
      outb_p(3, io);
      outb_p(1, io);
}

static void one(void)
{
      outb_p(5, io);
      outb_p(7, io);
      outb_p(5, io);
}

static int rt_setfreq(struct rt_device *dev, unsigned long freq)
{
      int i;

      freq = freq / 200 + 856;

      spin_lock(&lock);

      outb_p(0xc8, io);
      outb_p(0xc9, io);
      outb_p(0xc9, io);

      for (i = 0; i < 10; i++)
            zero ();

      for (i = 14; i >= 0; i--)
            if (freq & (1 << i))
                  one ();
            else
                  zero ();

      outb_p(0xc8, io);
      if (!dev->muted)
            outb_p(0, io);

      spin_unlock(&lock);
      return 0;
}

static int vidioc_querycap(struct file *file, void *priv,
                        struct v4l2_capability *v)
{
      strlcpy(v->driver, "radio-rtrack2", sizeof(v->driver));
      strlcpy(v->card, "RadioTrack II", sizeof(v->card));
      sprintf(v->bus_info, "ISA");
      v->version = RADIO_VERSION;
      v->capabilities = V4L2_CAP_TUNER;
      return 0;
}

static int vidioc_s_tuner(struct file *file, void *priv,
                        struct v4l2_tuner *v)
{
      if (v->index > 0)
            return -EINVAL;

      return 0;
}

static int rt_getsigstr(struct rt_device *dev)
{
      if (inb(io) & 2)  /* bit set = no signal present      */
            return 0;
      return 1;         /* signal present       */
}

static int vidioc_g_tuner(struct file *file, void *priv,
                        struct v4l2_tuner *v)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      if (v->index > 0)
            return -EINVAL;

      strcpy(v->name, "FM");
      v->type = V4L2_TUNER_RADIO;
      v->rangelow = (88*16000);
      v->rangehigh = (108*16000);
      v->rxsubchans = V4L2_TUNER_SUB_MONO;
      v->capability = V4L2_TUNER_CAP_LOW;
      v->audmode = V4L2_TUNER_MODE_MONO;
      v->signal = 0xFFFF*rt_getsigstr(rt);
      return 0;
}

static int vidioc_s_frequency(struct file *file, void *priv,
                        struct v4l2_frequency *f)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      rt->curfreq = f->frequency;
      rt_setfreq(rt, rt->curfreq);
      return 0;
}

static int vidioc_g_frequency(struct file *file, void *priv,
                        struct v4l2_frequency *f)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      f->type = V4L2_TUNER_RADIO;
      f->frequency = rt->curfreq;
      return 0;
}

static int vidioc_queryctrl(struct file *file, void *priv,
                        struct v4l2_queryctrl *qc)
{
      int i;

      for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
            if (qc->id && qc->id == radio_qctrl[i].id) {
                  memcpy(qc, &(radio_qctrl[i]),
                                    sizeof(*qc));
                  return 0;
            }
      }
      return -EINVAL;
}

static int vidioc_g_ctrl(struct file *file, void *priv,
                        struct v4l2_control *ctrl)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            ctrl->value = rt->muted;
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            if (rt->muted)
                  ctrl->value = 0;
            else
                  ctrl->value = 65535;
            return 0;
      }
      return -EINVAL;
}

static int vidioc_s_ctrl(struct file *file, void *priv,
                        struct v4l2_control *ctrl)
{
      struct video_device *dev = video_devdata(file);
      struct rt_device *rt = dev->priv;

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            if (ctrl->value)
                  rt_mute(rt);
            else
                  rt_unmute(rt);
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            if (ctrl->value)
                  rt_unmute(rt);
            else
                  rt_mute(rt);
            return 0;
      }
      return -EINVAL;
}

static int vidioc_g_audio(struct file *file, void *priv,
                        struct v4l2_audio *a)
{
      if (a->index > 1)
            return -EINVAL;

      strcpy(a->name, "Radio");
      a->capability = V4L2_AUDCAP_STEREO;
      return 0;
}

static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
{
      *i = 0;
      return 0;
}

static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
{
      if (i != 0)
            return -EINVAL;
      return 0;
}

static int vidioc_s_audio(struct file *file, void *priv,
                        struct v4l2_audio *a)
{
      if (a->index != 0)
            return -EINVAL;
      return 0;
}

static struct rt_device rtrack2_unit;

static const struct file_operations rtrack2_fops = {
      .owner            = THIS_MODULE,
      .open           = video_exclusive_open,
      .release        = video_exclusive_release,
      .ioctl            = video_ioctl2,
      .compat_ioctl     = v4l_compat_ioctl32,
      .llseek         = no_llseek,
};

static struct video_device rtrack2_radio=
{
      .owner            = THIS_MODULE,
      .name       = "RadioTrack II radio",
      .type       = VID_TYPE_TUNER,
      .fops           = &rtrack2_fops,
      .vidioc_querycap    = vidioc_querycap,
      .vidioc_g_tuner     = vidioc_g_tuner,
      .vidioc_s_tuner     = vidioc_s_tuner,
      .vidioc_g_frequency = vidioc_g_frequency,
      .vidioc_s_frequency = vidioc_s_frequency,
      .vidioc_queryctrl   = vidioc_queryctrl,
      .vidioc_g_ctrl      = vidioc_g_ctrl,
      .vidioc_s_ctrl      = vidioc_s_ctrl,
      .vidioc_g_audio     = vidioc_g_audio,
      .vidioc_s_audio     = vidioc_s_audio,
      .vidioc_g_input     = vidioc_g_input,
      .vidioc_s_input     = vidioc_s_input,
};

static int __init rtrack2_init(void)
{
      if(io==-1)
      {
            printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
            return -EINVAL;
      }
      if (!request_region(io, 4, "rtrack2"))
      {
            printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
            return -EBUSY;
      }

      rtrack2_radio.priv=&rtrack2_unit;

      spin_lock_init(&lock);
      if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
      {
            release_region(io, 4);
            return -EINVAL;
      }

      printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");

      /* mute card - prevents noisy bootups */
      outb(1, io);
      rtrack2_unit.muted = 1;

      return 0;
}

MODULE_AUTHOR("Ben Pfaff");
MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
MODULE_LICENSE("GPL");

module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
module_param(radio_nr, int, 0);

static void __exit rtrack2_cleanup_module(void)
{
      video_unregister_device(&rtrack2_radio);
      release_region(io,4);
}

module_init(rtrack2_init);
module_exit(rtrack2_cleanup_module);

/*
  Local variables:
  compile-command: "mmake"
  End:
*/

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