dahdi-tools/xpp/xtalk/xtalk.c

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/*
* Written by Oron Peled <oron@actcom.co.il>
* Copyright (C) 2009, Xorcom
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <arpa/inet.h>
#include <xtalk.h>
#include <debug.h>
#define DBG_MASK 0x02
#define TIMEOUT 6000
/*
* Base XTALK device. A pointer to this struct
* should be included in the struct representing
* the dialect.
*/
struct xtalk_device {
void *transport_priv; /* e.g: struct xusb */
struct xtalk_ops ops;
struct xtalk_protocol xproto;
uint8_t xtalk_proto_version;
uint8_t status;
size_t packet_size;
uint16_t tx_sequenceno;
};
CMD_DEF(XTALK, ACK,
uint8_t stat;
);
CMD_DEF(XTALK, PROTO_GET,
uint8_t proto_version;
uint8_t reserved;
);
CMD_DEF(XTALK, PROTO_GET_REPLY,
uint8_t proto_version;
uint8_t reserved;
);
union XTALK_PDATA(XTALK) {
MEMBER(XTALK, ACK);
MEMBER(XTALK, PROTO_GET);
MEMBER(XTALK, PROTO_GET_REPLY);
} PACKED members;
struct xtalk_protocol xtalk_base = {
.name = "XTALK",
.proto_version = 0,
.commands = {
CMD_RECV(XTALK, ACK, NULL),
CMD_SEND(XTALK, PROTO_GET),
CMD_RECV(XTALK, PROTO_GET_REPLY, NULL),
},
.ack_statuses = {
ACK_STAT(OK, "Acknowledges previous command"),
ACK_STAT(FAIL, "Last command failed"),
ACK_STAT(RESET_FAIL, "reset failed"),
ACK_STAT(NODEST, "No destination is selected"),
ACK_STAT(MISMATCH, "Data mismatch"),
ACK_STAT(NOACCESS, "No access"),
ACK_STAT(BAD_CMD, "Bad command"),
ACK_STAT(TOO_SHORT, "Packet is too short"),
ACK_STAT(ERROFFS, "Offset error (not used)"),
ACK_STAT(NO_LEEPROM, "Large EEPROM was not found"),
ACK_STAT(NO_EEPROM, "No EEPROM was found"),
ACK_STAT(WRITE_FAIL, "Writing to device failed"),
ACK_STAT(NOPWR_ERR, "No power on USB connector"),
}
};
void free_command(struct xtalk_command *cmd)
{
if (!cmd)
return;
memset(cmd, 0, cmd->header.len);
free(cmd);
}
static const struct xtalk_command_desc *get_command_desc(
const struct xtalk_protocol *xproto, uint8_t op)
{
const struct xtalk_command_desc *desc;
if (!xproto)
return NULL;
desc = &xproto->commands[op];
if (!desc->name)
return NULL;
#if 0
DBG("%s version=%d, op=0x%X (%s)\n",
xproto->name, xproto->proto_version,
op, desc->name);
#endif
return desc;
}
static const char *ack_status_msg(const struct xtalk_protocol *xproto,
uint8_t status)
{
const char *ack_status;
if (!xproto)
return NULL;
ack_status = xproto->ack_statuses[status];
DBG("%s status=0x%X (%s)\n", xproto->name, status, ack_status);
return ack_status;
}
int xtalk_set_protocol(struct xtalk_device *xtalk_dev,
const struct xtalk_protocol *xproto)
{
const char *protoname = (xproto) ? xproto->name : "GLOBAL";
int i;
DBG("%s\n", protoname);
memset(&xtalk_dev->xproto, 0, sizeof(xtalk_dev->xproto));
for (i = 0; i < MAX_OPS; i++) {
const struct xtalk_command_desc *desc;
desc = get_command_desc(xproto, i);
if (desc) {
if (!IS_PRIVATE_OP(i)) {
ERR("Bad op=0x%X "
"(should be in the range [0x%X-0x%X]\n",
i, PRIVATE_OP_FIRST, PRIVATE_OP_LAST);
return -EINVAL;
}
xtalk_dev->xproto.commands[i] = *desc;
DBG("private: op=0x%X (%s)\n", i, desc->name);
} else {
if (!IS_PRIVATE_OP(i)) {
const char *name;
xtalk_dev->xproto.commands[i] =
xtalk_base.commands[i];
name = xtalk_dev->xproto.commands[i].name;
if (name)
DBG("global: op=0x%X (%s)\n", i, name);
}
}
}
for (i = 0; i < MAX_STATUS; i++) {
const char *stat_msg;
stat_msg = (xproto) ? xproto->ack_statuses[i] : NULL;
if (stat_msg) {
if (!IS_PRIVATE_OP(i)) {
ERR("Bad status=0x%X "
"(should be in the range [0x%X-0x%X]\n",
i, PRIVATE_OP_FIRST, PRIVATE_OP_LAST);
return -EINVAL;
}
xtalk_dev->xproto.ack_statuses[i] = stat_msg;
DBG("private: status=0x%X (%s)\n", i, stat_msg);
} else {
if (!IS_PRIVATE_OP(i)) {
const char *stat_msg;
xtalk_dev->xproto.ack_statuses[i] =
xtalk_base.ack_statuses[i];
stat_msg = xtalk_dev->xproto.ack_statuses[i];
if (stat_msg)
DBG("global: status=0x%X (%s)\n",
i, stat_msg);
}
}
}
xtalk_dev->xproto.name = protoname;
xtalk_dev->xproto.proto_version = (xproto) ? xproto->proto_version : 0;
return 0;
}
struct xtalk_command *new_command(
const struct xtalk_device *xtalk_dev,
uint8_t op, uint16_t extra_data)
{
const struct xtalk_protocol *xproto;
struct xtalk_command *cmd;
const struct xtalk_command_desc *desc;
uint16_t len;
xproto = &xtalk_dev->xproto;
desc = get_command_desc(xproto, op);
if (!desc) {
ERR("Unknown op=0x%X.\n", op);
return NULL;
}
DBG("OP=0x%X [%s] (extra_data %d)\n", op, desc->name, extra_data);
len = desc->len + extra_data;
cmd = malloc(len);
if (!cmd) {
ERR("Out of memory\n");
return NULL;
}
if (extra_data) {
uint8_t *ptr = (uint8_t *)cmd;
DBG("clear extra_data (%d bytes)\n", extra_data);
memset(ptr + desc->len, 0, extra_data);
}
cmd->header.op = op;
cmd->header.len = len;
cmd->header.seq = 0; /* Overwritten in send_usb() */
return cmd;
}
void xtalk_dump_command(struct xtalk_command *cmd)
{
uint16_t len;
int i;
len = cmd->header.len;
if (len < sizeof(struct xtalk_header)) {
ERR("Command too short (%d)\n", len);
return;
}
INFO("DUMP: OP=0x%X len=%d seq=%d\n",
cmd->header.op, cmd->header.len, cmd->header.seq);
for (i = 0; i < len - sizeof(struct xtalk_header); i++)
INFO(" %2d. 0x%X\n", i, cmd->alt.raw_data[i]);
}
static int send_command(struct xtalk_device *xtalk_dev,
struct xtalk_command *cmd, int timeout)
{
int ret;
int len;
void *priv = xtalk_dev->transport_priv;
len = cmd->header.len;
cmd->header.seq = xtalk_dev->tx_sequenceno;
ret = xtalk_dev->ops.send_func(priv, (char *)cmd, len, timeout);
if (ret < 0)
DBG("send_func failed ret=%d\n", ret);
xtalk_dev->tx_sequenceno++;
return ret;
}
static struct xtalk_command *recv_command(struct xtalk_device *xtalk_dev,
int timeout)
{
struct xtalk_command *reply;
void *priv = xtalk_dev->transport_priv;
size_t psize = xtalk_dev->packet_size;
int ret;
reply = malloc(psize);
if (!reply) {
ERR("Out of memory\n");
goto err;
}
reply->header.len = 0;
ret = xtalk_dev->ops.recv_func(priv, (char *)reply, psize, timeout);
if (ret < 0) {
ERR("Receive from usb failed.\n");
goto err;
} else if (ret == 0) {
goto err; /* No reply */
}
if (ret != reply->header.len) {
ERR("Wrong length received: got %d bytes, "
"but length field says %d bytes%s\n",
ret, reply->header.len,
(ret == 1) ? ". Old USB firmware?" : "");
goto err;
}
/* dump_packet(LOG_DEBUG, DBG_MASK, __func__, (char *)reply, ret); */
return reply;
err:
if (reply) {
memset(reply, 0, psize);
free_command(reply);
}
return NULL;
}
__attribute__((warn_unused_result))
int process_command(
struct xtalk_device *xtalk_dev,
struct xtalk_command *cmd,
struct xtalk_command **reply_ref)
{
const struct xtalk_protocol *xproto;
struct xtalk_command *reply = NULL;
const struct xtalk_command_desc *reply_desc;
const struct xtalk_command_desc *expected;
const struct xtalk_command_desc *cmd_desc;
uint8_t reply_op;
const char *protoname;
int ret;
xproto = &xtalk_dev->xproto;
protoname = (xproto) ? xproto->name : "GLOBAL";
/* So the caller knows if a reply was received */
if (reply_ref)
*reply_ref = NULL;
reply_op = cmd->header.op | XTALK_REPLY_MASK;
cmd_desc = get_command_desc(xproto, cmd->header.op);
expected = get_command_desc(xproto, reply_op);
ret = send_command(xtalk_dev, cmd, TIMEOUT);
if (!reply_ref) {
DBG("No reply requested\n");
goto out;
}
if (ret < 0) {
ERR("send_command failed: %d\n", ret);
goto out;
}
reply = recv_command(xtalk_dev, TIMEOUT);
if (!reply) {
ERR("recv_command failed\n");
ret = -EPROTO;
goto out;
}
*reply_ref = reply;
if ((reply->header.op & 0x80) != 0x80) {
ERR("Unexpected reply op=0x%02X, should have MSB set.\n",
reply->header.op);
ret = -EPROTO;
goto out;
}
DBG("REPLY OP: 0x%X\n", reply->header.op);
reply_desc = get_command_desc(xproto, reply->header.op);
if (!reply_desc) {
ERR("Unknown reply (proto=%s) op=0x%02X\n",
protoname, reply->header.op);
ret = -EPROTO;
goto out;
}
DBG("REPLY NAME: %s\n", reply_desc->name);
if (reply->header.op == XTALK_ACK) {
int status = CMD_FIELD(reply, XTALK, ACK, stat);
if (expected) {
ERR("Expected OP=0x%02X: Got ACK(%d): %s\n",
reply_op,
status,
ack_status_msg(xproto, status));
ret = -EPROTO;
goto out;
} else if (status != STAT_OK) {
ERR("Got ACK (for OP=0x%X [%s]): %d %s\n",
cmd->header.op,
cmd_desc->name,
status, ack_status_msg(xproto, status));
ret = -EPROTO;
goto out;
}
/* Good expected ACK ... */
} else if (reply->header.op != reply_op) {
ERR("Expected OP=0x%02X: Got OP=0x%02X\n",
reply_op, reply->header.op);
ret = -EPROTO;
goto out;
}
if (expected && expected->len > reply->header.len) {
ERR("Expected len=%d: Got len=%d\n",
expected->len, reply->header.len);
ret = -EPROTO;
goto out;
}
if (cmd->header.seq != reply->header.seq) {
ERR("Expected seq=%d: Got seq=%d\n",
cmd->header.seq, reply->header.seq);
ret = -EPROTO;
goto out;
}
ret = reply->header.len; /* All good, return the length */
DBG("returning reply op 0x%X (%d bytes)\n", reply->header.op, ret);
out:
free_command(cmd);
if (!reply_ref && reply)
free_command(reply);
return ret;
}
/*
* Protocol Commands
*/
int xtalk_proto_query(struct xtalk_device *xtalk_dev)
{
struct xtalk_command *cmd;
struct xtalk_command *reply;
uint8_t proto_version;
int ret;
DBG("\n");
assert(xtalk_dev != NULL);
proto_version = xtalk_dev->xproto.proto_version;
cmd = new_command(xtalk_dev, XTALK_PROTO_GET, 0);
if (!cmd) {
ERR("new_command failed\n");
return -ENOMEM;
}
/* Protocol Version */
CMD_FIELD(cmd, XTALK, PROTO_GET, proto_version) = proto_version;
ret = process_command(xtalk_dev, cmd, &reply);
if (ret < 0) {
ERR("process_command failed: %d\n", ret);
goto out;
}
xtalk_dev->xtalk_proto_version =
CMD_FIELD(reply, XTALK, PROTO_GET_REPLY, proto_version);
if (xtalk_dev->xtalk_proto_version != proto_version) {
DBG("Got %s protocol version: 0x%02x (expected 0x%02x)\n",
xtalk_dev->xproto.name,
xtalk_dev->xtalk_proto_version,
proto_version);
ret = xtalk_dev->xtalk_proto_version;
goto out;
}
DBG("Protocol version: %02x\n", xtalk_dev->xtalk_proto_version);
ret = xtalk_dev->xtalk_proto_version;
out:
free_command(reply);
return ret;
}
/*
* Wrappers
*/
struct xtalk_device *xtalk_new(const struct xtalk_ops *ops,
size_t packet_size, void *priv)
{
struct xtalk_device *xtalk_dev;
int ret;
DBG("\n");
assert(ops != NULL);
xtalk_dev = malloc(sizeof(*xtalk_dev));
if (!xtalk_dev) {
ERR("Allocating XTALK device memory failed\n");
return NULL;
}
memset(xtalk_dev, 0, sizeof(*xtalk_dev));
memcpy((void *)&xtalk_dev->ops, (const void *)ops,
sizeof(xtalk_dev->ops));
xtalk_dev->transport_priv = priv;
xtalk_dev->packet_size = packet_size;
xtalk_dev->tx_sequenceno = 1;
ret = xtalk_set_protocol(xtalk_dev, NULL);
if (ret < 0) {
ERR("GLOBAL Protocol registration failed: %d\n", ret);
goto err;
}
return xtalk_dev;
err:
if (xtalk_dev)
xtalk_delete(xtalk_dev);
return NULL;
}
void xtalk_delete(struct xtalk_device *xtalk_dev)
{
void *priv;
if (!xtalk_dev)
return;
DBG("\n");
priv = xtalk_dev->transport_priv;
assert(priv);
xtalk_dev->tx_sequenceno = 0;
assert(&xtalk_dev->ops != NULL);
assert(&xtalk_dev->ops.close_func != NULL);
xtalk_dev->ops.close_func(priv);
}