eb0f7d9597
git-svn-id: svn://svn.linux1394.org/libraw1394/trunk@30 53a565d1-3bb7-0310-b661-cf11e63c67ab
74 lines
1.9 KiB
C
74 lines
1.9 KiB
C
/*
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* libraw1394 - library for raw access to the 1394 bus with the Linux subsystem.
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*
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* Copyright (C) 1999,2000 Andreas Bombe
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*
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* This library is licensed under the GNU Lesser General Public License (LGPL),
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* version 2.1 or later. See the file COPYING.LIB in the distribution for
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* details.
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*/
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#include <config.h>
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#include <errno.h>
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#include <unistd.h>
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#include "raw1394.h"
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#include "kernel-raw1394.h"
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#include "raw1394_private.h"
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static int do_iso_listen(struct raw1394_handle *handle, int channel)
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{
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struct sync_cb_data sd = { 0, 0 };
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struct raw1394_reqhandle rh = { (req_callback_t)_raw1394_sync_cb, &sd };
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int err;
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struct raw1394_request *req = &handle->req;
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CLEAR_REQ(req);
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req->type = RAW1394_REQ_ISO_LISTEN;
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req->generation = handle->generation;
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req->misc = channel;
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req->tag = (__u64)&rh;
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req->recvb = (__u64)handle->buffer;
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req->length = HBUF_SIZE;
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err = write(handle->fd, req, sizeof(*req));
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while (!sd.done) {
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if (err < 0) return err;
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err = raw1394_loop_iterate(handle);
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}
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switch (sd.errcode) {
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case RAW1394_ERROR_ALREADY:
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errno = EALREADY;
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return -1;
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case RAW1394_ERROR_INVALID_ARG:
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errno = EINVAL;
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return -1;
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default:
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errno = 0;
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return sd.errcode;
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}
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}
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int raw1394_start_iso_rcv(struct raw1394_handle *handle, unsigned int channel)
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{
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if (channel > 63) {
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errno = EINVAL;
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return -1;
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}
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return do_iso_listen(handle, channel);
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}
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int raw1394_stop_iso_rcv(struct raw1394_handle *handle, unsigned int channel)
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{
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if (channel > 63) {
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errno = EINVAL;
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return -1;
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}
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return do_iso_listen(handle, ~channel);
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}
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