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