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/*
* RTEMS for Nintendo DS sound driver.
*
* Copyright (c) 2008 by Matthieu Bucchianeri <mbucchia@gmail.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
*
* http://www.rtems.com/license/LICENSE
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <bsp.h>
#include <rtems/irq.h>
#include <rtems/libio.h>
#include <nds.h>
#include "sound.h"
#include "../include/my_ipc.h"
/*
* default values.
*/
static int volume = 64;
static int pan = 64;
static int freq = 11025;
static int format = 0; // 0 is 8 bits and 1 is 16 bits
static int offset = 0;
/*
* sound device driver initialize entry point.
*/
rtems_device_driver
sound_initialize (rtems_device_major_number major,
rtems_device_minor_number minor, void *arg)
{
rtems_status_code status;
printk ("[+] sound started\n");
/* register the devices */
status = rtems_io_register_name ("/dev/pcm", major, 0);
if (status != RTEMS_SUCCESSFUL) {
printk ("[!] error registering sound\n");
rtems_fatal_error_occurred (status);
}
/* reset IPCs structs */
IPC->soundData = NULL;
memset ((void *)my_IPC, 0, sizeof (*my_IPC));
DC_FlushAll ();
return RTEMS_SUCCESSFUL;
}
/*
* sound device driver open operation.
*/
rtems_device_driver
sound_open (rtems_device_major_number major,
rtems_device_minor_number minor, void *arg)
{
return RTEMS_SUCCESSFUL;
}
/*
* sound device driver close operation.
*/
rtems_device_driver
sound_close (rtems_device_major_number major,
rtems_device_minor_number minor, void *arg)
{
return RTEMS_SUCCESSFUL;
}
/*
* sound device driver read operation. read data from recorded microphone
* samples.
*/
rtems_device_driver
sound_read (rtems_device_major_number major,
rtems_device_minor_number minor, void *arg)
{
rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *) arg;
/* check end of file */
if (offset >= my_IPC->recorded_length) {
rw_args->bytes_moved = 0;
return RTEMS_SUCCESSFUL;
}
/* read buffer */
memcpy ((void *)rw_args->buffer, (void *)my_IPC->record_buffer + offset, rw_args->count);
offset += rw_args->count;
rw_args->bytes_moved = rw_args->count;
return RTEMS_SUCCESSFUL;
}
/*
* sound device driver write operation. read a pcm sound.
*/
rtems_device_driver
sound_write (rtems_device_major_number major,
rtems_device_minor_number minor, void *arg)
{
rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *) arg;
static TransferSound snd;
/* XXX not exclusive */
while (IPC->soundData != NULL);
snd.count = 1;
snd.data[0].data = rw_args->buffer;
snd.data[0].len = rw_args->count;
snd.data[0].rate = freq;
snd.data[0].vol = volume;
snd.data[0].pan = pan;
snd.data[0].format = format;
IPC->soundData = &snd;
DC_FlushAll ();
rw_args->bytes_moved = rw_args->count;
return RTEMS_SUCCESSFUL;
}
/*
* ioctl entry point.
*/
rtems_device_driver
sound_control (rtems_device_major_number major,
rtems_device_minor_number minor, void *arg)
{
rtems_libio_ioctl_args_t *args = arg;
uint32_t *val = (uint32_t *) args->buffer;
switch (args->command) {
/* sound volume management */
case SOUND_SVOL:
volume = *val;
break;
case SOUND_GVOL:
*val = volume;
break;
/* sound format settings */
case SOUND_SFMT:
switch (*val & SOUND_FREQ_MASK) {
case SOUND_FREQ_11025:
freq = 11025;
break;
case SOUND_FREQ_22050:
freq = 22050;
break;
case SOUND_FREQ_44100:
freq = 44100;
break;
case SOUND_FREQ_RECORD:
freq = 16384;
break;
}
format = (*val & SOUND_FORMAT_16) ? 1 : 0;
printk ("[+] pcm %d bits @ %d hz\n", format ? 16 : 8, freq);
break;
case SOUND_GFMT:
if (freq == 11025) {
*val = SOUND_FREQ_11025;
} else if (freq == 22050) {
*val = SOUND_FREQ_22050;
} else if (freq == 44100) {
*val = SOUND_FREQ_44100;
} else if (freq == 16384) {
*val = SOUND_FREQ_RECORD;
}
*val |= format ? SOUND_FORMAT_16 : SOUND_FORMAT_8;
break;
/* sound pan settings */
case SOUND_SPAN:
pan = *val;
break;
case SOUND_GPAN:
*val = pan;
break;
/* set recording buffer length */
case SOUND_SRECLEN:
my_IPC->record_buffer = malloc (*val);
my_IPC->record_length_max = *val;
printk ("[+] mic buffer %u B @ %p\n", my_IPC->record_length_max,
my_IPC->record_buffer);
break;
/* start recording */
case SOUND_STARTREC:
my_IPC->recorded_length = 0;
my_IPC->record = 1;
break;
/* stop recording */
case SOUND_STOPREC:
if (!my_IPC->record) {
printk ("[!] STOPREC while not recording\n");
}
my_IPC->record = 0;
while (my_IPC->recorded_length == 0);
offset = 0;
if (val != NULL) {
*val = my_IPC->recorded_length;
}
break;
default:
break;
}
return RTEMS_SUCCESSFUL;
}
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