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* sound/audio.c
*
* Device file manager for /dev/audio
*
* 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_SOUNDCARD
#ifndef EXCLUDE_AUDIO
#include "ulaw.h"
#include "coproc.h"
#define ON 1
#define OFF 0
static int wr_buff_no[MAX_AUDIO_DEV]; /*
* != -1, if there is
* a incomplete output
* block in the queue.
*/
static int wr_buff_size[MAX_AUDIO_DEV], wr_buff_ptr[MAX_AUDIO_DEV];
static int audio_mode[MAX_AUDIO_DEV];
static int dev_nblock[MAX_AUDIO_DEV]; /* 1 if in noblocking mode */
#define AM_NONE 0
#define AM_WRITE 1
#define AM_READ 2
static char *wr_dma_buf[MAX_AUDIO_DEV];
static int audio_format[MAX_AUDIO_DEV];
static int local_conversion[MAX_AUDIO_DEV];
static int
set_format (int dev, long fmt)
{
if (fmt != AFMT_QUERY)
{
local_conversion[dev] = 0;
if (!(audio_devs[dev]->format_mask & fmt)) /* Not supported */
if (fmt == AFMT_MU_LAW)
{
fmt = AFMT_U8;
local_conversion[dev] = AFMT_MU_LAW;
}
else
fmt = AFMT_U8; /* This is always supported */
audio_format[dev] = DMAbuf_ioctl (dev, SNDCTL_DSP_SETFMT, (ioctl_arg) fmt, 1);
}
if (local_conversion[dev]) /* This shadows the HW format */
return local_conversion[dev];
return audio_format[dev];
}
int
audio_open (int dev, struct fileinfo *file)
{
int ret;
long bits;
int dev_type = dev & 0x0f;
int mode = file->mode & O_ACCMODE;
dev = dev >> 4;
if (dev_type == SND_DEV_DSP16)
bits = 16;
else
bits = 8;
if ((ret = DMAbuf_open (dev, mode)) < 0)
return ret;
if (audio_devs[dev]->coproc)
if ((ret = audio_devs[dev]->coproc->
open (audio_devs[dev]->coproc->devc, COPR_PCM)) < 0)
{
audio_release (dev, file);
printk ("Sound: Can't access coprocessor device\n");
return ret;
}
local_conversion[dev] = 0;
if (DMAbuf_ioctl (dev, SNDCTL_DSP_SETFMT, (ioctl_arg) bits, 1) != bits)
{
audio_release (dev, file);
return -ENXIO;
}
if (dev_type == SND_DEV_AUDIO)
{
set_format (dev, AFMT_MU_LAW);
}
else
set_format (dev, bits);
wr_buff_no[dev] = -1;
audio_mode[dev] = AM_NONE;
wr_buff_size[dev] = wr_buff_ptr[dev] = 0;
dev_nblock[dev] = 0;
return ret;
}
void
audio_release (int dev, struct fileinfo *file)
{
int mode;
dev = dev >> 4;
mode = file->mode & O_ACCMODE;
if (wr_buff_no[dev] >= 0)
{
DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
wr_buff_no[dev] = -1;
}
if (audio_devs[dev]->coproc)
audio_devs[dev]->coproc->close (audio_devs[dev]->coproc->devc, COPR_PCM);
DMAbuf_release (dev, mode);
}
#if defined(NO_INLINE_ASM) || !defined(i386)
static void
translate_bytes (const unsigned char *table, unsigned char *buff, int n)
{
unsigned long i;
if (n <= 0)
return;
for (i = 0; i < n; ++i)
buff[i] = table[buff[i]];
}
#else
extern inline void
translate_bytes (const void *table, void *buff, int n)
{
if (n > 0)
{
__asm__ ("cld\n"
"1:\tlodsb\n\t"
"xlatb\n\t"
"stosb\n\t"
"loop 1b\n\t":
: "b" ((long) table), "c" (n), "D" ((long) buff), "S" ((long) buff)
: "bx", "cx", "di", "si", "ax");
}
}
#endif
int
audio_write (int dev, struct fileinfo *file, const snd_rw_buf * buf, int count)
{
int c, p, l;
int err;
dev = dev >> 4;
p = 0;
c = count;
if ((audio_mode[dev] & AM_READ) && !(audio_devs[dev]->flags & DMA_DUPLEX))
{ /* Direction change */
wr_buff_no[dev] = -1;
}
if (audio_devs[dev]->flags & DMA_DUPLEX)
audio_mode[dev] |= AM_WRITE;
else
audio_mode[dev] = AM_WRITE;
if (!count) /*
* Flush output
*/
{
if (wr_buff_no[dev] >= 0)
{
DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
wr_buff_no[dev] = -1;
}
return 0;
}
while (c)
{ /*
* Perform output blocking
*/
if (wr_buff_no[dev] < 0) /*
* There is no incomplete buffers
*/
{
if ((wr_buff_no[dev] = DMAbuf_getwrbuffer (dev, &wr_dma_buf[dev],
&wr_buff_size[dev],
dev_nblock[dev])) < 0)
{
/* Handle nonblocking mode */
if (dev_nblock[dev] && wr_buff_no[dev] == -EAGAIN)
return p; /* No more space. Return # of accepted bytes */
return wr_buff_no[dev];
}
wr_buff_ptr[dev] = 0;
}
l = c;
if (l > (wr_buff_size[dev] - wr_buff_ptr[dev]))
l = (wr_buff_size[dev] - wr_buff_ptr[dev]);
if (!audio_devs[dev]->copy_from_user)
{ /*
* No device specific copy routine
*/
memcpy_fromfs (&wr_dma_buf[dev][wr_buff_ptr[dev]], &((buf)[p]), l);
}
else
audio_devs[dev]->copy_from_user (dev,
wr_dma_buf[dev], wr_buff_ptr[dev], buf, p, l);
/*
* Insert local processing here
*/
if (local_conversion[dev] == AFMT_MU_LAW)
{
/*
* This just allows interrupts while the conversion is running
*/
sti ();
translate_bytes (ulaw_dsp, (unsigned char *) &wr_dma_buf[dev][wr_buff_ptr[dev]], l);
}
c -= l;
p += l;
wr_buff_ptr[dev] += l;
if (wr_buff_ptr[dev] >= wr_buff_size[dev])
{
if ((err = DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev])) < 0)
{
return err;
}
wr_buff_no[dev] = -1;
}
}
return count;
}
int
audio_read (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
{
int c, p, l;
char *dmabuf;
int buff_no;
dev = dev >> 4;
p = 0;
c = count;
if ((audio_mode[dev] & AM_WRITE) && !(audio_devs[dev]->flags & DMA_DUPLEX))
{
if (wr_buff_no[dev] >= 0)
{
DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
if (!(audio_devs[dev]->flags & DMA_DUPLEX))
wr_buff_no[dev] = -1;
}
}
if (audio_devs[dev]->flags & DMA_DUPLEX)
audio_mode[dev] |= AM_READ;
else
audio_mode[dev] = AM_READ;
while (c)
{
if ((buff_no = DMAbuf_getrdbuffer (dev, &dmabuf, &l,
dev_nblock[dev])) < 0)
{
/* Nonblocking mode handling. Return current # of bytes */
if (dev_nblock[dev] && buff_no == -EAGAIN)
return p;
return buff_no;
}
if (l > c)
l = c;
/*
* Insert any local processing here.
*/
if (local_conversion[dev] == AFMT_MU_LAW)
{
/*
* This just allows interrupts while the conversion is running
*/
sti ();
translate_bytes (dsp_ulaw, (unsigned char *) dmabuf, l);
}
memcpy_tofs (&((buf)[p]), dmabuf, l);
DMAbuf_rmchars (dev, buff_no, l);
p += l;
c -= l;
}
return count - c;
}
int
audio_ioctl (int dev, struct fileinfo *file,
unsigned int cmd, ioctl_arg arg)
{
dev = dev >> 4;
if (((cmd >> 8) & 0xff) == 'C')
{
if (audio_devs[dev]->coproc) /* Coprocessor ioctl */
return audio_devs[dev]->coproc->ioctl (audio_devs[dev]->coproc->devc, cmd, arg, 0);
else
printk ("/dev/dsp%d: No coprocessor for this device\n", dev);
return -ENXIO;
}
else
switch (cmd)
{
case SNDCTL_DSP_SYNC:
if (wr_buff_no[dev] >= 0)
{
DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
wr_buff_no[dev] = -1;
}
return DMAbuf_ioctl (dev, cmd, arg, 0);
break;
case SNDCTL_DSP_POST:
if (wr_buff_no[dev] >= 0)
{
DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
wr_buff_no[dev] = -1;
}
return 0;
break;
case SNDCTL_DSP_RESET:
wr_buff_no[dev] = -1;
audio_mode[dev] = AM_NONE;
return DMAbuf_ioctl (dev, cmd, arg, 0);
break;
case SNDCTL_DSP_GETFMTS:
return snd_ioctl_return ((int *) arg, audio_devs[dev]->format_mask);
break;
case SNDCTL_DSP_SETFMT:
return snd_ioctl_return ((int *) arg, set_format (dev, get_fs_long ((long *) arg)));
case SNDCTL_DSP_GETISPACE:
if ((audio_mode[dev] & AM_WRITE) && !(audio_devs[dev]->flags & DMA_DUPLEX))
return -EBUSY;
{
audio_buf_info info;
int err = DMAbuf_ioctl (dev, cmd, (ioctl_arg) & info, 1);
if (err < 0)
return err;
memcpy_tofs ((&((char *) arg)[0]), (char *) &info, sizeof (info));
return 0;
}
case SNDCTL_DSP_GETOSPACE:
if ((audio_mode[dev] & AM_READ) && !(audio_devs[dev]->flags & DMA_DUPLEX))
return -EBUSY;
{
audio_buf_info info;
int err = DMAbuf_ioctl (dev, cmd, (ioctl_arg) & info, 1);
if (err < 0)
return err;
if (wr_buff_no[dev] != -1)
info.bytes += wr_buff_size[dev] - wr_buff_ptr[dev];
memcpy_tofs ((&((char *) arg)[0]), (char *) &info, sizeof (info));
return 0;
}
case SNDCTL_DSP_NONBLOCK:
dev_nblock[dev] = 1;
return 0;
break;
case SNDCTL_DSP_GETCAPS:
{
int info = 1; /* Revision level of this ioctl() */
if (audio_devs[dev]->flags & DMA_DUPLEX)
info |= DSP_CAP_DUPLEX;
if (audio_devs[dev]->coproc)
info |= DSP_CAP_COPROC;
if (audio_devs[dev]->local_qlen) /* Device has hidden buffers */
info |= DSP_CAP_BATCH;
if (audio_devs[dev]->trigger) /* Supports SETTRIGGER */
info |= DSP_CAP_TRIGGER;
memcpy_tofs ((&((char *) arg)[0]), (char *) &info, sizeof (info));
return 0;
}
break;
default:
return DMAbuf_ioctl (dev, cmd, arg, 0);
}
}
long
audio_init (long mem_start)
{
/*
* NOTE! This routine could be called several times during boot.
*/
return mem_start;
}
int
audio_select (int dev, struct fileinfo *file, int sel_type, select_table * wait)
{
dev = dev >> 4;
switch (sel_type)
{
case SEL_IN:
if (!(audio_mode[dev] & AM_READ) && !(audio_devs[dev]->flags & DMA_DUPLEX))
return 0; /* Not recording */
return DMAbuf_select (dev, file, sel_type, wait);
break;
case SEL_OUT:
if (!(audio_mode[dev] & AM_WRITE) && !(audio_devs[dev]->flags & DMA_DUPLEX))
return 0; /* Wrong direction */
if (wr_buff_no[dev] != -1)
{
return 1; /* There is space in the current buffer */
}
return DMAbuf_select (dev, file, sel_type, wait);
break;
case SEL_EX:
return 0;
}
return 0;
}
#endif
#endif
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