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/* dmx.c
*
* Milkymist DMX512 driver for RTEMS
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*
* COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq
*/
#define RTEMS_STATUS_CHECKS_USE_PRINTK
#include <stdlib.h>
#include <sys/types.h>
#include <rtems.h>
#include <rtems/status-checks.h>
#include <bsp.h>
#include <rtems/libio.h>
#include "../include/system_conf.h"
#include "milkymist_dmx.h"
#define IN_DEVICE_NAME "/dev/dmx_in"
#define OUT_DEVICE_NAME "/dev/dmx_out"
rtems_device_driver dmx_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code sc;
sc = rtems_io_register_name(IN_DEVICE_NAME, major, 0);
RTEMS_CHECK_SC(sc, "create DMX input device");
sc = rtems_io_register_name(OUT_DEVICE_NAME, major, 1);
RTEMS_CHECK_SC(sc, "create DMX output device");
return RTEMS_SUCCESSFUL;
}
rtems_device_driver dmx_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;
int len;
unsigned int i;
unsigned char *values = (unsigned char *)rw_args->buffer;
len = 512 - rw_args->offset;
if (len < 0) {
rw_args->bytes_moved = 0;
return RTEMS_SUCCESSFUL;
}
if (len > rw_args->count)
len = rw_args->count;
if (minor == 0) {
for (i=0;i<len;i++)
values[i] = MM_READ(MM_DMX_RX((unsigned int)rw_args->offset+i));
} else {
for (i=0;i<len;i++)
values[i] = MM_READ(MM_DMX_TX((unsigned int)rw_args->offset+i));
}
rw_args->bytes_moved = len;
return RTEMS_SUCCESSFUL;
}
rtems_device_driver dmx_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;
int len;
unsigned int i;
unsigned char *values = (unsigned char *)rw_args->buffer;
if (minor == 0) {
rw_args->bytes_moved = 0;
return RTEMS_UNSATISFIED;
}
len = 512 - rw_args->offset;
if (len < 0) {
rw_args->bytes_moved = 0;
return RTEMS_SUCCESSFUL;
}
if (len > rw_args->count)
len = rw_args->count;
for (i=0;i<len;i++)
MM_WRITE(MM_DMX_TX((unsigned int)rw_args->offset+i), values[i]);
rw_args->bytes_moved = len;
return RTEMS_SUCCESSFUL;
}
rtems_device_driver dmx_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_libio_ioctl_args_t *args = arg;
switch (args->command) {
case DMX_SET_THRU:
args->ioctl_return = 0;
MM_WRITE(MM_DMX_THRU, (unsigned int)args->buffer);
return RTEMS_SUCCESSFUL;
case DMX_GET_THRU:
args->ioctl_return = 0;
*((unsigned int *)args->buffer) = MM_READ(MM_DMX_THRU);
return RTEMS_SUCCESSFUL;
default:
args->ioctl_return = -1;
return RTEMS_UNSATISFIED;
}
}
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