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radio-terratec.c

/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
 * (c) 1999 R. Offermanns (rolf@offermanns.de)
 * based on the aimslab radio driver from M. Kirkwood
 * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
 *
 *
 * History:
 * 1999-05-21     First preview release
 *
 *  Notes on the hardware:
 *  There are two "main" chips on the card:
 *  - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
 *  - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
 *  (you can get the datasheet at the above links)
 *
 *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
 *  Volume Control is done digitally
 *
 *  there is a I2C controlled RDS decoder (SAA6588)  onboard, which i would like to support someday
 *  (as soon i have understand how to get started :)
 *  If you can help me out with that, please contact me!!
 *
 *
 * 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       = 0xff,
            .step          = 1,
            .default_value = 0xff,
            .type          = V4L2_CTRL_TYPE_INTEGER,
      }
};

#ifndef CONFIG_RADIO_TERRATEC_PORT
#define CONFIG_RADIO_TERRATEC_PORT 0x590
#endif

/**************** this ones are for the terratec *******************/
#define BASEPORT  0x590
#define VOLPORT   0x591
#define WRT_DIS   0x00
#define CLK_OFF         0x00
#define IIC_DATA  0x01
#define IIC_CLK         0x02
#define DATA            0x04
#define CLK_ON          0x08
#define WRT_EN          0x10
/*******************************************************************/

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

struct tt_device
{
      int port;
      int curvol;
      unsigned long curfreq;
      int muted;
};


/* local things */

static void cardWriteVol(int volume)
{
      int i;
      volume = volume+(volume * 32); // change both channels
      spin_lock(&lock);
      for (i=0;i<8;i++)
      {
            if (volume & (0x80>>i))
                  outb(0x80, VOLPORT);
            else outb(0x00, VOLPORT);
      }
      spin_unlock(&lock);
}



static void tt_mute(struct tt_device *dev)
{
      dev->muted = 1;
      cardWriteVol(0);
}

static int tt_setvol(struct tt_device *dev, int vol)
{

//    printk(KERN_ERR "setvol called, vol = %d\n", vol);

      if(vol == dev->curvol) {      /* requested volume = current */
            if (dev->muted) { /* user is unmuting the card  */
                  dev->muted = 0;
                  cardWriteVol(vol);      /* enable card */
            }

            return 0;
      }

      if(vol == 0) {                /* volume = 0 means mute the card */
            cardWriteVol(0);  /* "turn off card" by setting vol to 0 */
            dev->curvol = vol;      /* track the volume state!    */
            return 0;
      }

      dev->muted = 0;

      cardWriteVol(vol);

      dev->curvol = vol;

      return 0;

}


/* this is the worst part in this driver */
/* many more or less strange things are going on here, but hey, it works :) */

static int tt_setfreq(struct tt_device *dev, unsigned long freq1)
{
      int freq;
      int i;
      int p;
      int  temp;
      long rest;

      unsigned char buffer[25];           /* we have to bit shift 25 registers */
      freq = freq1/160;             /* convert the freq. to a nice to handle value */
      for(i=24;i>-1;i--)
            buffer[i]=0;

      rest = freq*10+10700;         /* i once had understood what is going on here */
                              /* maybe some wise guy (friedhelm?) can comment this stuff */
      i=13;
      p=10;
      temp=102400;
      while (rest!=0)
      {
            if (rest%temp  == rest)
                  buffer[i] = 0;
            else
            {
                  buffer[i] = 1;
                  rest = rest-temp;
            }
            i--;
            p--;
            temp = temp/2;
      }

      spin_lock(&lock);

      for (i=24;i>-1;i--)                 /* bit shift the values to the radiocard */
      {
            if (buffer[i]==1)
            {
                  outb(WRT_EN|DATA, BASEPORT);
                  outb(WRT_EN|DATA|CLK_ON  , BASEPORT);
                  outb(WRT_EN|DATA, BASEPORT);
            }
            else
            {
                  outb(WRT_EN|0x00, BASEPORT);
                  outb(WRT_EN|0x00|CLK_ON  , BASEPORT);
            }
      }
      outb(0x00, BASEPORT);

      spin_unlock(&lock);

      return 0;
}

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

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

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

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

      strcpy(v->name, "FM");
      v->type = V4L2_TUNER_RADIO;
      v->rangelow = (87*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*tt_getsigstr(tt);
      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 vidioc_s_frequency(struct file *file, void *priv,
                              struct v4l2_frequency *f)
{
      struct video_device *dev = video_devdata(file);
      struct tt_device *tt = dev->priv;

      tt->curfreq = f->frequency;
      tt_setfreq(tt, tt->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 tt_device *tt = dev->priv;

      f->type = V4L2_TUNER_RADIO;
      f->frequency = tt->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 tt_device *tt = dev->priv;

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            if (tt->muted)
                  ctrl->value = 1;
            else
                  ctrl->value = 0;
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            ctrl->value = tt->curvol * 6554;
            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 tt_device *tt = dev->priv;

      switch (ctrl->id) {
      case V4L2_CID_AUDIO_MUTE:
            if (ctrl->value)
                  tt_mute(tt);
            else
                  tt_setvol(tt,tt->curvol);
            return 0;
      case V4L2_CID_AUDIO_VOLUME:
            tt_setvol(tt,ctrl->value);
            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 tt_device terratec_unit;

static const struct file_operations terratec_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 terratec_radio=
{
      .owner            = THIS_MODULE,
      .name       = "TerraTec ActiveRadio",
      .type       = VID_TYPE_TUNER,
      .fops           = &terratec_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 terratec_init(void)
{
      if(io==-1)
      {
            printk(KERN_ERR "You must set an I/O address with io=0x???\n");
            return -EINVAL;
      }
      if (!request_region(io, 2, "terratec"))
      {
            printk(KERN_ERR "TerraTec: port 0x%x already in use\n", io);
            return -EBUSY;
      }

      terratec_radio.priv=&terratec_unit;

      spin_lock_init(&lock);

      if(video_register_device(&terratec_radio, VFL_TYPE_RADIO, radio_nr)==-1)
      {
            release_region(io,2);
            return -EINVAL;
      }

      printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver.\n");

      /* mute card - prevents noisy bootups */

      /* this ensures that the volume is all the way down  */
      cardWriteVol(0);
      terratec_unit.curvol = 0;

      return 0;
}

MODULE_AUTHOR("R.OFFERMANNS & others");
MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
MODULE_LICENSE("GPL");
module_param(io, int, 0);
MODULE_PARM_DESC(io, "I/O address of the TerraTec ActiveRadio card (0x590 or 0x591)");
module_param(radio_nr, int, 0);

static void __exit terratec_cleanup_module(void)
{
      video_unregister_device(&terratec_radio);
      release_region(io,2);
      printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver unloaded.\n");
}

module_init(terratec_init);
module_exit(terratec_cleanup_module);


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