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/*
* libraw1394 - library for raw access to the 1394 bus with the Linux subsystem.
*
* Copyright (C) 1999,2000,2001,2002 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 <unistd.h>
#include <errno.h>
#include "raw1394.h"
#include "kernel-raw1394.h"
#include "raw1394_private.h"
/**
* raw1394_start_read - initiate a read transaction
* @node: target node
* @addr: address to read from
* @length: amount of data to read
* @buffer: pointer to buffer where data will be saved
* @tag: data to identify the request to completion handler
*
* This function starts the specified read request and returns %0 for success
* and a negative number for an error, in which case errno will be set. If
* @length is %4 a quadlet read is initiated and a block read otherwise.
*
* The transaction is only started, no success of the transaction is implied
* with a successful return of this function. When the transaction completes, a
* raw1394_loop_iterate() will call the tag handler and pass it the tag and
* error code of the transaction. @tag should therefore be set to something
* that uniquely identifies this transaction (e.g. a struct pointer casted to
* unsigned long).
**/
int raw1394_start_read(struct raw1394_handle *handle, nodeid_t node,
nodeaddr_t addr, size_t length, quadlet_t *buffer,
unsigned long tag)
{
struct raw1394_request *req = &handle->req;
CLEAR_REQ(req);
req->type = RAW1394_REQ_ASYNC_READ;
req->generation = handle->generation;
req->tag = tag;
req->address = ((__u64)node << 48) | addr;
req->length = length;
req->recvb = ptr2int(buffer);
return (int)write(handle->fd, req, sizeof(*req));
}
/**
* raw1394_start_write - initiate a write transaction
* @node: target node
* @addr: address to write to
* @length: amount of data to write
* @data: pointer to data to be sent
* @tag: data to identify the request to completion handler
*
* This function starts the specified write request and returns %0 for success
* and a negative number for an error, in which case errno will be set. If
* @length is %4 a quadlet write is initiated and a block write otherwise.
*
* The transaction is only started, no success of the transaction is implied
* with a successful return of this function. When the transaction completes, a
* raw1394_loop_iterate() will call the tag handler and pass it the tag and
* error code of the transaction. @tag should therefore be set to something
* that uniquely identifies this transaction (e.g. a struct pointer casted to
* unsigned long).
**/
int raw1394_start_write(struct raw1394_handle *handle, nodeid_t node,
nodeaddr_t addr, size_t length, quadlet_t *data,
unsigned long tag)
{
struct raw1394_request *req = &handle->req;
CLEAR_REQ(req);
req->type = RAW1394_REQ_ASYNC_WRITE;
req->generation = handle->generation;
req->tag = tag;
req->address = ((__u64)node << 48) | addr;
req->length = length;
req->sendb = ptr2int(data);
return (int)write(handle->fd, req, sizeof(*req));
}
/**
* raw1394_start_read - initiate a lock transaction
* @node: target node
* @addr: address to read from
* @extcode: extended transaction code determining the lock operation
* @data: data part of lock parameters
* @arg: arg part of lock parameters
* @result: address where return value will be written
* @tag: data to identify the request to completion handler
*
* This function starts the specified lock request and returns %0 for success
* and a negative number for an error, in which case errno will be set.
*
* The transaction is only started, no success of the transaction is implied
* with a successful return of this function. When the transaction completes, a
* raw1394_loop_iterate() will call the tag handler and pass it the tag and
* error code of the transaction. @tag should therefore be set to something
* that uniquely identifies this transaction (e.g. a struct pointer casted to
* unsigned long).
**/
int raw1394_start_lock(struct raw1394_handle *handle, nodeid_t node,
nodeaddr_t addr, unsigned int extcode, quadlet_t data,
quadlet_t arg, quadlet_t *result, unsigned long tag)
{
struct raw1394_request *req = &handle->req;
quadlet_t sendbuf[2];
if ((extcode > 7) || (extcode == 0)) {
errno = EINVAL;
return -1;
}
CLEAR_REQ(req);
req->type = RAW1394_REQ_LOCK;
req->generation = handle->generation;
req->tag = tag;
req->address = ((__u64)node << 48) | addr;
req->sendb = ptr2int(sendbuf);
req->recvb = ptr2int(result);
req->misc = extcode;
switch (extcode) {
case 3: /* EXTCODE_FETCH_ADD */
case 4: /* EXTCODE_LITTLE_ADD */
sendbuf[0] = data;
req->length = 4;
break;
default:
sendbuf[0] = arg;
sendbuf[1] = data;
req->length = 8;
break;
}
return (int)write(handle->fd, req, sizeof(*req));
}
/**
* raw1394_start_iso_write - initiate an isochronous packet write
* @channel: channel number on which to send on
* @tag: data to be put into packet's tag field
* @sy: data to be put into packet's sy field
* @speed: speed at which to send
* @length: amount of data to send
* @data: pointer to data to send
* @rawtag: data to identify the request to completion handler
*
* This function starts the specified isochronous packet transmission and
* returns %0 for success and a negative number for an error, in which case
* errno will be set.
*
* When the send completes, a raw1394_loop_iterate() will call the tag handler
* and pass it the tag and error code of the transaction. @tag should therefore
* be set to something that uniquely identifies this transaction (e.g. a struct
* pointer casted to unsigned long).
*
* Isochronous packets are automatically
**/
int raw1394_start_iso_write(struct raw1394_handle *handle, unsigned int channel,
unsigned int tag, unsigned int sy,
unsigned int speed, size_t length, quadlet_t *data,
unsigned long rawtag)
{
struct raw1394_request *req = &handle->req;
CLEAR_REQ(req);
req->type = RAW1394_REQ_ISO_SEND;
req->generation = handle->generation;
req->tag = rawtag;
req->address = ((__u64)channel << 48) | speed;
req->misc = (tag << 16) | sy;
req->length = length;
req->sendb = ptr2int(data);
return (int)write(handle->fd, req, sizeof(*req));
}
#define SYNCFUNC_VARS \
struct sync_cb_data sd = { 0, 0 }; \
struct raw1394_reqhandle rh = { (req_callback_t)_raw1394_sync_cb, \
&sd }; \
int err = 0
#define SYNCFUNC_BODY \
while (!sd.done) { \
if (err < 0) return err; \
err = raw1394_loop_iterate(handle); \
} \
handle->err = sd.errcode; \
errno = raw1394_errcode_to_errno(sd.errcode); \
return (errno ? -1 : 0)
int raw1394_read(struct raw1394_handle *handle, nodeid_t node, nodeaddr_t addr,
size_t length, quadlet_t *buffer)
{
SYNCFUNC_VARS;
err = raw1394_start_read(handle, node, addr, length, buffer,
(unsigned long)&rh);
SYNCFUNC_BODY;
}
int raw1394_write(struct raw1394_handle *handle, nodeid_t node, nodeaddr_t addr,
size_t length, quadlet_t *data)
{
SYNCFUNC_VARS;
err = raw1394_start_write(handle, node, addr, length, data,
(unsigned long)&rh);
SYNCFUNC_BODY;
}
int raw1394_lock(struct raw1394_handle *handle, nodeid_t node, nodeaddr_t addr,
unsigned int extcode, quadlet_t data, quadlet_t arg,
quadlet_t *result)
{
SYNCFUNC_VARS;
err = raw1394_start_lock(handle, node, addr, extcode, data, arg, result,
(unsigned long)&rh);
SYNCFUNC_BODY;
}
int raw1394_iso_write(struct raw1394_handle *handle, unsigned int channel,
unsigned int tag, unsigned int sy, unsigned int speed,
size_t length, quadlet_t *data)
{
SYNCFUNC_VARS;
err = raw1394_start_iso_write(handle, channel, tag, sy, speed, length,
data, (unsigned long)&rh);
SYNCFUNC_BODY;
}
#undef SYNCFUNC_VARS
#undef SYNCFUNC_BODY
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