357 lines
7.3 KiB
C
357 lines
7.3 KiB
C
/*
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* sound/audio.c
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*
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* Device file manager for /dev/audio
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*
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* Copyright by Hannu Savolainen 1993
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include "sound_config.h"
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#ifdef CONFIGURE_SOUNDCARD
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#ifndef EXCLUDE_AUDIO
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#include "ulaw.h"
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#define ON 1
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#define OFF 0
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static int wr_buff_no[MAX_DSP_DEV]; /* != -1, if there is a
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* incomplete output block */
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static int wr_buff_size[MAX_DSP_DEV], wr_buff_ptr[MAX_DSP_DEV];
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static int audio_mode[MAX_DSP_DEV];
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#define AM_NONE 0
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#define AM_WRITE 1
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#define AM_READ 2
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static char *wr_dma_buf[MAX_DSP_DEV];
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int
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audio_open (int dev, struct fileinfo *file)
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{
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int ret;
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int bits;
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int dev_type = dev & 0x0f;
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int mode = file->mode & O_ACCMODE;
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dev = dev >> 4;
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if (dev_type == SND_DEV_DSP16)
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bits = 16;
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else
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bits = 8;
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if ((ret = DMAbuf_open (dev, mode)) < 0)
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return ret;
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if (DMAbuf_ioctl (dev, SNDCTL_DSP_SAMPLESIZE, bits, 1) != bits)
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{
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audio_release (dev, file);
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return RET_ERROR (ENXIO);
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}
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wr_buff_no[dev] = -1;
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audio_mode[dev] = AM_NONE;
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return ret;
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}
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void
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audio_release (int dev, struct fileinfo *file)
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{
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int mode;
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dev = dev >> 4;
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mode = file->mode & O_ACCMODE;
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if (wr_buff_no[dev] >= 0)
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{
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DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
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wr_buff_no[dev] = -1;
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}
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DMAbuf_release (dev, mode);
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}
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#ifdef NO_INLINE_ASM
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static void
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translate_bytes (const unsigned char *table, unsigned char *buff, unsigned long n)
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{
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unsigned long i;
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for (i = 0; i < n; ++i)
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buff[i] = table[buff[i]];
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}
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#else
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extern inline void
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translate_bytes (const void *table, void *buff, unsigned long n)
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{
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__asm__ ("cld\n"
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"1:\tlodsb\n\t"
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"xlatb\n\t"
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"stosb\n\t"
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"loop 1b\n\t":
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:"b" ((long) table), "c" (n), "D" ((long) buff), "S" ((long) buff)
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:"bx", "cx", "di", "si", "ax");
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}
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#endif
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int
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audio_write (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
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{
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int c, p, l;
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int err;
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int dev_type = dev & 0x0f;
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dev = dev >> 4;
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p = 0;
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c = count;
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if (audio_mode[dev] == AM_READ) /* Direction changed */
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{
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wr_buff_no[dev] = -1;
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}
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audio_mode[dev] = AM_WRITE;
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if (!count) /* Flush output */
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{
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if (wr_buff_no[dev] >= 0)
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{
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DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
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wr_buff_no[dev] = -1;
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}
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return 0;
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}
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while (c)
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{ /* Perform output blocking */
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if (wr_buff_no[dev] < 0) /* There is no incomplete buffers */
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{
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if ((wr_buff_no[dev] = DMAbuf_getwrbuffer (dev, &wr_dma_buf[dev], &wr_buff_size[dev])) < 0)
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return wr_buff_no[dev];
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wr_buff_ptr[dev] = 0;
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}
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l = c;
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if (l > (wr_buff_size[dev] - wr_buff_ptr[dev]))
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l = (wr_buff_size[dev] - wr_buff_ptr[dev]);
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if (!dsp_devs[dev]->copy_from_user)
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{ /* No device specific copy routine */
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COPY_FROM_USER (&wr_dma_buf[dev][wr_buff_ptr[dev]], buf, p, l);
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}
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else
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dsp_devs[dev]->copy_from_user (dev,
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wr_dma_buf[dev], wr_buff_ptr[dev], buf, p, l);
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/* Insert local processing here */
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if (dev_type == SND_DEV_AUDIO)
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{
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#ifdef linux
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/* This just allows interrupts while the conversion is running */
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__asm__ ("sti");
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#endif
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translate_bytes (ulaw_dsp, (unsigned char *) &wr_dma_buf[dev][wr_buff_ptr[dev]], l);
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}
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c -= l;
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p += l;
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wr_buff_ptr[dev] += l;
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if (wr_buff_ptr[dev] >= wr_buff_size[dev])
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{
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if ((err = DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev])) < 0)
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return err;
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wr_buff_no[dev] = -1;
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}
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}
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return count;
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}
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int
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audio_read (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
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{
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int c, p, l;
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char *dmabuf;
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int buff_no;
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int dev_type = dev & 0x0f;
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dev = dev >> 4;
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p = 0;
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c = count;
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if (audio_mode[dev] == AM_WRITE)
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{
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if (wr_buff_no[dev] >= 0)
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{
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DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
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wr_buff_no[dev] = -1;
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}
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}
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audio_mode[dev] = AM_READ;
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while (c)
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{
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if ((buff_no = DMAbuf_getrdbuffer (dev, &dmabuf, &l)) < 0)
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return buff_no;
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if (l > c)
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l = c;
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/* Insert any local processing here. */
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if (dev_type == SND_DEV_AUDIO)
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{
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#ifdef linux
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/* This just allows interrupts while the conversion is running */
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__asm__ ("sti");
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#endif
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translate_bytes (dsp_ulaw, (unsigned char *) dmabuf, l);
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}
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COPY_TO_USER (buf, p, dmabuf, l);
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DMAbuf_rmchars (dev, buff_no, l);
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p += l;
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c -= l;
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}
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return count - c;
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}
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int
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audio_ioctl (int dev, struct fileinfo *file,
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unsigned int cmd, unsigned int arg)
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{
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int dev_type = dev & 0x0f;
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dev = dev >> 4;
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switch (cmd)
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{
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case SNDCTL_DSP_SYNC:
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if (wr_buff_no[dev] >= 0)
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{
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DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
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wr_buff_no[dev] = -1;
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}
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return DMAbuf_ioctl (dev, cmd, arg, 0);
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break;
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case SNDCTL_DSP_POST:
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if (wr_buff_no[dev] >= 0)
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{
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DMAbuf_start_output (dev, wr_buff_no[dev], wr_buff_ptr[dev]);
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wr_buff_no[dev] = -1;
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}
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return 0;
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break;
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case SNDCTL_DSP_RESET:
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wr_buff_no[dev] = -1;
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return DMAbuf_ioctl (dev, cmd, arg, 0);
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break;
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default:
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if (dev_type == SND_DEV_AUDIO)
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return RET_ERROR (EIO);
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return DMAbuf_ioctl (dev, cmd, arg, 0);
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}
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}
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long
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audio_init (long mem_start)
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{
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return mem_start;
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}
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#else
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/* Stub versions */
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int
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audio_read (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
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{
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return RET_ERROR (EIO);
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}
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int
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audio_write (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
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{
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return RET_ERROR (EIO);
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}
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int
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audio_open (int dev, struct fileinfo *file)
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{
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return RET_ERROR (ENXIO);
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}
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void
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audio_release (int dev, struct fileinfo *file)
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{
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};
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int
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audio_ioctl (int dev, struct fileinfo *file,
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unsigned int cmd, unsigned int arg)
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{
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return RET_ERROR (EIO);
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}
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int
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audio_lseek (int dev, struct fileinfo *file, off_t offset, int orig)
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{
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return RET_ERROR (EIO);
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}
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long
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audio_init (long mem_start)
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{
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return mem_start;
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}
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#endif
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#endif
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