94 lines
3.8 KiB
C
94 lines
3.8 KiB
C
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/*
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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) 2002 Manfred Weihs <weihs@ict.tuwien.ac.at>
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* Christian Toegel <christian.toegel@gmx.at>
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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 <stdlib.h>
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#include <string.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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/*
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* AdressRangeMapping REGISTERING:
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* start, length .... identifies addressrange
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* *initial_value ... pointer to buffer containing (if necessary) initial value
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* NULL means undefined
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* arm_tag .......... identifier for arm_tag_handler
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* (usually pointer to raw1394_arm_reqhandle)
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* access_rights .... access-rights for registered addressrange handled
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* by kernel-part. Value is one or more binary or of the
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* following flags: ARM_READ, ARM_WRITE, ARM_LOCK
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* notification_options ... identifies for which type of request you want
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* to be notified. Value is one or more binary or of the
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* following flags: ARM_READ, ARM_WRITE, ARM_LOCK
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* client_transactions ... identifies for which type of request you want
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* to handle the request by the client application.
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* for those requests no response will be generated, but
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* has to be generated by the application.
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* Value is one or more binary or of the
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* following flags: ARM_READ, ARM_WRITE, ARM_LOCK
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* For each bit set here, notification_options and
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* access_rights will be ignored.
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* returnvalue: 0 ... success
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* <0 ... failure
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*/
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int raw1394_arm_register(struct raw1394_handle *handle, nodeaddr_t start,
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size_t length, byte_t *initial_value,
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octlet_t arm_tag, arm_options_t access_rights,
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arm_options_t notification_options,
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arm_options_t client_transactions)
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{
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int retval=0;
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struct raw1394_request *req = &(handle->req);
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if (((start & ~(0xFFFFFFFFFFFF)) != 0) ||
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(((start + length) & ~(0xFFFFFFFFFFFF)) != 0)) {
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errno = EINVAL;
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return (-1);
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}
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CLEAR_REQ(req);
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req->type = RAW1394_REQ_ARM_REGISTER;
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req->generation = handle->generation; /* not necessary */
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req->address = start;
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req->length = length;
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req->tag = arm_tag;
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req->recvb = ptr2int(handle->buffer); /* arm_handle on success */
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req->misc = ((client_transactions & 0x0f) << 8)|((notification_options & 0x0F) << 4)|(access_rights & 0x0F)
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|((ARM_REC_LENGTH & 0xFFFF) << 16);
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req->sendb = ptr2int(initial_value);
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retval = (int) write(handle->fd, req, sizeof(*req));
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return (retval == sizeof(*req)) ? 0:-1;
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}
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/*
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* AdressRangeMapping UNREGISTERING:
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* start ............ identifies addressrange for unregistering
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* (value of start have to be the same value
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* used for registering this adressrange)
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* returnvalue: 0 ... success
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* <0 ... failure
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*/
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int raw1394_arm_unregister (struct raw1394_handle *handle, nodeaddr_t start)
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{
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int retval;
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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_ARM_UNREGISTER;
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req->generation = handle->generation; /* not necessary */
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req->address = start;
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retval = write(handle->fd, req, sizeof(*req));
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return (retval == sizeof(*req)) ? 0:-1;
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}
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