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tea575x-tuner.c

/*
 *   ALSA driver for TEA5757/5759 Philips AM/FM radio tuner chips
 *
 *    Copyright (c) 2004 Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */      

#include <asm/io.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <sound/core.h>
#include <sound/tea575x-tuner.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Routines for control of TEA5757/5759 Philips AM/FM radio tuner chips");
MODULE_LICENSE("GPL");

/*
 * definitions
 */

#define TEA575X_BIT_SEARCH    (1<<24)           /* 1 = search action, 0 = tuned */
#define TEA575X_BIT_UPDOWN    (1<<23)           /* 0 = search down, 1 = search up */
#define TEA575X_BIT_MONO      (1<<22)           /* 0 = stereo, 1 = mono */
#define TEA575X_BIT_BAND_MASK (3<<20)
#define TEA575X_BIT_BAND_FM   (0<<20)
#define TEA575X_BIT_BAND_MW   (1<<20)
#define TEA575X_BIT_BAND_LW   (1<<21)
#define TEA575X_BIT_BAND_SW   (1<<22)
#define TEA575X_BIT_PORT_0    (1<<19)           /* user bit */
#define TEA575X_BIT_PORT_1    (1<<18)           /* user bit */
#define TEA575X_BIT_SEARCH_MASK     (3<<16)           /* search level */
#define TEA575X_BIT_SEARCH_5_28          (0<<16)      /* FM >5uV, AM >28uV */
#define TEA575X_BIT_SEARCH_10_40     (1<<16)    /* FM >10uV, AM > 40uV */
#define TEA575X_BIT_SEARCH_30_63     (2<<16)    /* FM >30uV, AM > 63uV */
#define TEA575X_BIT_SEARCH_150_1000  (3<<16)    /* FM > 150uV, AM > 1000uV */
#define TEA575X_BIT_DUMMY     (1<<15)           /* buffer */
#define TEA575X_BIT_FREQ_MASK 0x7fff

/*
 * lowlevel part
 */

static void snd_tea575x_set_freq(struct snd_tea575x *tea)
{
      unsigned long freq;

      freq = tea->freq / 16;        /* to kHz */
      if (freq > 108000)
            freq = 108000;
      if (freq < 87000)
            freq = 87000;
      /* crystal fixup */
      if (tea->tea5759)
            freq -= tea->freq_fixup;
      else
            freq += tea->freq_fixup;
      /* freq /= 12.5 */
      freq *= 10;
      freq /= 125;

      tea->val &= ~TEA575X_BIT_FREQ_MASK;
      tea->val |= freq & TEA575X_BIT_FREQ_MASK;
      tea->ops->write(tea, tea->val);
}

/*
 * Linux Video interface
 */

static int snd_tea575x_ioctl(struct inode *inode, struct file *file,
                       unsigned int cmd, unsigned long data)
{
      struct snd_tea575x *tea = video_drvdata(file);
      void __user *arg = (void __user *)data;
      
      switch(cmd) {
            case VIDIOCGCAP:
            {
                  struct video_capability v;
                  v.type = VID_TYPE_TUNER;
                  v.channels = 1;
                  v.audios = 1;
                  /* No we don't do pictures */
                  v.maxwidth = 0;
                  v.maxheight = 0;
                  v.minwidth = 0;
                  v.minheight = 0;
                  strcpy(v.name, tea->tea5759 ? "TEA5759" : "TEA5757");
                  if (copy_to_user(arg,&v,sizeof(v)))
                        return -EFAULT;
                  return 0;
            }
            case VIDIOCGTUNER:
            {
                  struct video_tuner v;
                  if (copy_from_user(&v, arg,sizeof(v))!=0) 
                        return -EFAULT;
                  if (v.tuner)      /* Only 1 tuner */ 
                        return -EINVAL;
                  v.rangelow = (87*16000);
                  v.rangehigh = (108*16000);
                  v.flags = VIDEO_TUNER_LOW;
                  v.mode = VIDEO_MODE_AUTO;
                  strcpy(v.name, "FM");
                  v.signal = 0xFFFF;
                  if (copy_to_user(arg, &v, sizeof(v)))
                        return -EFAULT;
                  return 0;
            }
            case VIDIOCSTUNER:
            {
                  struct video_tuner v;
                  if(copy_from_user(&v, arg, sizeof(v)))
                        return -EFAULT;
                  if(v.tuner!=0)
                        return -EINVAL;
                  /* Only 1 tuner so no setting needed ! */
                  return 0;
            }
            case VIDIOCGFREQ:
                  if(copy_to_user(arg, &tea->freq, sizeof(tea->freq)))
                        return -EFAULT;
                  return 0;
            case VIDIOCSFREQ:
                  if(copy_from_user(&tea->freq, arg, sizeof(tea->freq)))
                        return -EFAULT;
                  snd_tea575x_set_freq(tea);
                  return 0;
            case VIDIOCGAUDIO:
            {     
                  struct video_audio v;
                  memset(&v, 0, sizeof(v));
                  strcpy(v.name, "Radio");
                  if(copy_to_user(arg,&v, sizeof(v)))
                        return -EFAULT;
                  return 0;               
            }
            case VIDIOCSAUDIO:
            {
                  struct video_audio v;
                  if(copy_from_user(&v, arg, sizeof(v))) 
                        return -EFAULT;   
                  if (tea->ops->mute)
                        tea->ops->mute(tea,
                                     (v.flags &
                                    VIDEO_AUDIO_MUTE) ? 1 : 0);
                  if(v.audio) 
                        return -EINVAL;
                  return 0;
            }
            default:
                  return -ENOIOCTLCMD;
      }
}

static void snd_tea575x_release(struct video_device *vfd)
{
}

static int snd_tea575x_exclusive_open(struct inode *inode, struct file *file)
{
      struct snd_tea575x *tea = video_drvdata(file);

      return test_and_set_bit(0, &tea->in_use) ? -EBUSY : 0;
}

static int snd_tea575x_exclusive_release(struct inode *inode, struct file *file)
{
      struct snd_tea575x *tea = video_drvdata(file);

      clear_bit(0, &tea->in_use);
      return 0;
}

/*
 * initialize all the tea575x chips
 */
void snd_tea575x_init(struct snd_tea575x *tea)
{
      unsigned int val;

      val = tea->ops->read(tea);
      if (val == 0x1ffffff || val == 0) {
            snd_printk(KERN_ERR "Cannot find TEA575x chip\n");
            return;
      }

      memset(&tea->vd, 0, sizeof(tea->vd));
      strcpy(tea->vd.name, tea->tea5759 ? "TEA5759 radio" : "TEA5757 radio");
      tea->vd.release = snd_tea575x_release;
      video_set_drvdata(&tea->vd, tea);
      tea->vd.fops = &tea->fops;
      tea->in_use = 0;
      tea->fops.owner = tea->card->module;
      tea->fops.open = snd_tea575x_exclusive_open;
      tea->fops.release = snd_tea575x_exclusive_release;
      tea->fops.ioctl = snd_tea575x_ioctl;
      if (video_register_device(&tea->vd, VFL_TYPE_RADIO, tea->dev_nr - 1) < 0) {
            snd_printk(KERN_ERR "unable to register tea575x tuner\n");
            return;
      }
      tea->vd_registered = 1;

      tea->val = TEA575X_BIT_BAND_FM | TEA575X_BIT_SEARCH_10_40;
      tea->freq = 90500 * 16;       /* 90.5Mhz default */

      snd_tea575x_set_freq(tea);

      /* mute on init */
      if (tea->ops->mute)
            tea->ops->mute(tea, 1);
}

void snd_tea575x_exit(struct snd_tea575x *tea)
{
      if (tea->vd_registered) {
            video_unregister_device(&tea->vd);
            tea->vd_registered = 0;
      }
}

static int __init alsa_tea575x_module_init(void)
{
      return 0;
}
        
static void __exit alsa_tea575x_module_exit(void)
{
}
        
module_init(alsa_tea575x_module_init)
module_exit(alsa_tea575x_module_exit)

EXPORT_SYMBOL(snd_tea575x_init);
EXPORT_SYMBOL(snd_tea575x_exit);

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