/* * sound/sound_switch.c *  * The system call switch *  * Copyright by Hannu Savolainen 1993 *  * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. 2. * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. *  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. *  */#include "sound_config.h"#ifdef CONFIGURE_SOUNDCARDstruct sbc_device{  int             usecount;};static struct sbc_device sbc_devices[SND_NDEVS] = {{0}};static int      in_use = 0;	/* Total # of open device files (excluding				 * minor 0) *//* * /dev/sndstatus -device */static char    *status_buf = NULL;static int      status_len, status_ptr;static int      status_busy = 0;static intput_status (char *s){  int             l;  for (l=0;l<256,s[l];l++);	/* l=strlen(s); */  if (status_len + l >= 4000)    return 0;  memcpy (&status_buf[status_len], s, l);  status_len += l;  return 1;}static intput_status_int (unsigned int val, int radix){  int             l, v;  static char hx[] = "0123456789abcdef";  char buf[11];  if (!val) return put_status("0");  l = 0;  buf[10]=0;  while (val)  {  	v = val % radix;  	val = val / radix;  	buf[9-l] = hx[v];  	l++;  }  if (status_len + l >= 4000)    return 0;  memcpy (&status_buf[status_len], &buf[10-l], l);  status_len += l;  return 1;}static voidinit_status (void){  /*   * Write the status information to the status_buf and update status_len.   * There is a limit of 4000 bytes for the data.   */  int             i;  status_ptr = 0;  put_status ("Sound Driver:" SOUND_VERSION_STRING	      " (" SOUND_CONFIG_DATE " " SOUND_CONFIG_BY "@"	      SOUND_CONFIG_HOST "." SOUND_CONFIG_DOMAIN ")"	      "\n");  if (!put_status ("Config options: "))    return;  if (!put_status_int(SELECTED_SOUND_OPTIONS, 16))     return;  if (!put_status ("\n\nHW config: \n"))    return;  for (i = 0; i < (num_sound_drivers - 1); i++)    {      if (!supported_drivers[i].enabled)       if (!put_status ("("))	return;      if (!put_status ("Type ")) return;      if (!put_status_int(supported_drivers[i].card_type, 10)) return;      if (!put_status (": ")) return;      if (!put_status (supported_drivers[i].name)) return;      if (!put_status (" at 0x")) return;      if (!put_status_int(supported_drivers[i].config.io_base, 16)) return;      if (!put_status (" irq ")) return;      if (!put_status_int(supported_drivers[i].config.irq, 10)) return;      if (!put_status (" drq ")) return;      if (!put_status_int(supported_drivers[i].config.dma, 10)) return;      if (!supported_drivers[i].enabled)       if (!put_status (")"))	return;      if (!put_status ("\n"))	return;    }  if (!put_status ("\nPCM devices:\n"))    return;  for (i = 0; i < num_dspdevs; i++)    {      if (!put_status_int(i, 10)) return;      if (!put_status(": "))return;      if (!put_status(dsp_devs[i]->name))return;      if (!put_status("\n"))return;    }  if (!put_status ("\nSynth devices:\n"))    return;  for (i = 0; i < num_synths; i++)    {      if (!put_status_int(i, 10)) return;      if (!put_status(": "))return;      if (!put_status(synth_devs[i]->info->name))return;      if (!put_status("\n"))return;    }  if (!put_status ("\nMidi devices:\n"))    return;  for (i = 0; i < num_midis; i++)    {      if (!put_status_int(i, 10)) return;      if (!put_status(": "))return;      if (!put_status(midi_devs[i]->info.name))return;      if (!put_status("\n"))return;    }  if (num_mixers)    {      if (!put_status ("\nMixer(s) installed\n"))	return;    }  else    {      if (!put_status ("\nNo mixers installed\n"))	return;    }}static intread_status (snd_rw_buf *buf, int count){  /*   * Return at most 'count' bytes from the status_buf.   */  int             l, c;  l = count;  c = status_len - status_ptr;  if (l > c)    l = c;  if (l <= 0)    return 0;  COPY_TO_USER(buf, 0, &status_buf[status_ptr], l);  status_ptr += l;  return l;}intsound_read_sw (int dev, struct fileinfo *file, snd_rw_buf *buf, int count){  DEB (printk ("sound_read_sw(dev=%d, count=%d)\n", dev, count));  switch (dev & 0x0f)    {    case SND_DEV_STATUS:      return read_status (buf, count);      break;    case SND_DEV_DSP:    case SND_DEV_DSP16:    case SND_DEV_AUDIO:      return audio_read (dev, file, buf, count);      break;    case SND_DEV_SEQ:      return sequencer_read (dev, file, buf, count);      break;#ifndef EXCLUDE_MPU401    case SND_DEV_MIDIN:      return MIDIbuf_read (dev, file, buf, count);#endif    default:      printk ("Sound: Undefined minor device %d\n", dev);    }  return RET_ERROR (EPERM);}intsound_write_sw (int dev, struct fileinfo *file, snd_rw_buf *buf, int count){  DEB (printk ("sound_write_sw(dev=%d, count=%d)\n", dev, count));  switch (dev & 0x0f)    {    case SND_DEV_SEQ:      return sequencer_write (dev, file, buf, count);      break;    case SND_DEV_DSP:    case SND_DEV_DSP16:    case SND_DEV_AUDIO:      return audio_write (dev, file, buf, count);      break;    default:      return RET_ERROR (EPERM);    }  return count;}intsound_open_sw (int dev, struct fileinfo *file){  int             retval;  DEB (printk ("sound_open_sw(dev=%d) : usecount=%d\n", dev, sbc_devices[dev].usecount));  if ((dev >= SND_NDEVS) || (dev < 0))    {      printk ("Invalid minor device %d\n", dev);      return RET_ERROR (ENXIO);    }  switch (dev & 0x0f)    {    case SND_DEV_STATUS:      if (status_busy)	return RET_ERROR (EBUSY);      status_busy = 1;      if ((status_buf = (char *) KERNEL_MALLOC (4000)) == NULL)	return RET_ERROR (EIO);      status_len = status_ptr = 0;      init_status ();      break;    case SND_DEV_CTL:      return 0;      break;    case SND_DEV_SEQ:      if ((retval = sequencer_open (dev, file)) < 0)	return retval;      break;#ifndef EXCLUDE_MPU401    case SND_DEV_MIDIN:      if ((retval = MIDIbuf_open (dev, file)) < 0)	return retval;      break;#endif    case SND_DEV_DSP:    case SND_DEV_DSP16:    case SND_DEV_AUDIO:      if ((retval = audio_open (dev, file)) < 0)	return retval;      break;    default:      printk ("Invalid minor device %d\n", dev);      return RET_ERROR (ENXIO);    }  sbc_devices[dev].usecount++;  in_use++;  return 0;}voidsound_release_sw (int dev, struct fileinfo *file){  DEB (printk ("sound_release_sw(dev=%d)\n", dev));  switch (dev & 0x0f)    {    case SND_DEV_STATUS:      if (status_buf)	KERNEL_FREE (status_buf);      status_buf = NULL;      status_busy = 0;      break;    case SND_DEV_CTL:      break;    case SND_DEV_SEQ:      sequencer_release (dev, file);      break;#ifndef EXCLUDE_MPU401    case SND_DEV_MIDIN:      MIDIbuf_release (dev, file);      break;#endif    case SND_DEV_DSP:    case SND_DEV_DSP16:    case SND_DEV_AUDIO:      audio_release (dev, file);      break;    default:      printk ("Sound error: Releasing unknown device 0x%02x\n", dev);    }  sbc_devices[dev].usecount--;  in_use--;}intsound_ioctl_sw (int dev, struct fileinfo *file,	     unsigned int cmd, unsigned long arg){  DEB (printk ("sound_ioctl_sw(dev=%d, cmd=0x%x, arg=0x%x)\n", dev, cmd, arg));  switch (dev & 0x0f)    {    case SND_DEV_CTL:      if (!num_mixers)	return RET_ERROR (ENXIO);      if ((dev >> 4) >= num_mixers)	return RET_ERROR (ENXIO);      return mixer_devs[dev >> 4]->ioctl (dev >> 4, cmd, arg);      break;    case SND_DEV_SEQ:      return sequencer_ioctl (dev, file, cmd, arg);      break;    case SND_DEV_DSP:    case SND_DEV_DSP16:    case SND_DEV_AUDIO:      return audio_ioctl (dev, file, cmd, arg);      break;#ifndef EXCLUDE_MPU401    case SND_DEV_MIDIN:      return MIDIbuf_ioctl (dev, file, cmd, arg);      break;#endif    default:      return RET_ERROR (EPERM);      break;    }  return RET_ERROR (EPERM);}#endif