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/*
* libraw1394 - library for raw access to the 1394 bus with the Linux subsystem.
*
* Copyright (C) 1999,2000 Andreas Bombe
*
* This library is licensed under the GNU Lesser General Public License (LGPL),
* version 2.1 or later. See the file COPYING.LIB in the distribution for
* details.
*/
#include <config.h>
#include <errno.h>
#include <unistd.h>
#include "raw1394.h"
#include "kernel-raw1394.h"
#include "raw1394_private.h"
static int do_iso_listen(struct raw1394_handle *handle, int channel)
{
struct sync_cb_data sd = { 0, 0 };
struct raw1394_reqhandle rh = { (req_callback_t)_raw1394_sync_cb, &sd };
int err;
struct raw1394_request *req = &handle->req;
CLEAR_REQ(req);
req->type = RAW1394_REQ_ISO_LISTEN;
req->generation = handle->generation;
req->misc = channel;
req->tag = ptr2int(&rh);
req->recvb = ptr2int(handle->buffer);
req->length = HBUF_SIZE;
err = write(handle->fd, req, sizeof(*req));
while (!sd.done) {
if (err < 0) return err;
err = raw1394_loop_iterate(handle);
}
switch (sd.errcode) {
case RAW1394_ERROR_ALREADY:
errno = EALREADY;
return -1;
case RAW1394_ERROR_INVALID_ARG:
errno = EINVAL;
return -1;
default:
errno = 0;
return sd.errcode;
}
}
int raw1394_start_iso_rcv(struct raw1394_handle *handle, unsigned int channel)
{
if (channel > 63) {
errno = EINVAL;
return -1;
}
return do_iso_listen(handle, channel);
}
int raw1394_stop_iso_rcv(struct raw1394_handle *handle, unsigned int channel)
{
if (channel > 63) {
errno = EINVAL;
return -1;
}
return do_iso_listen(handle, ~channel);
}
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