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/*
* epsonds-io.c - Epson ESC/I-2 driver, low level I/O.
*
* Copyright (C) 2015 Tower Technologies
* Author: Alessandro Zummo <a.zummo@towertech.it>
*
* This file is part of the SANE package.
*
* 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, version 2.
*/
#define DEBUG_DECLARE_ONLY
#include "sane/config.h"
#include <ctype.h>
#include <unistd.h> /* sleep */
#include "epsonds.h"
#include "epsonds-io.h"
size_t eds_send(epsonds_scanner *s, void *buf, size_t length, SANE_Status *status)
{
DBG(32, "%s: size = %lu\n", __func__, (u_long) length);
if (length == 2) {
char *cmd = buf;
switch (cmd[0]) {
case FS:
DBG(9, "%s: FS %c\n", __func__, cmd[1]);
break;
}
}
if (s->hw->connection == SANE_EPSONDS_NET) {
/* XXX */
} else if (s->hw->connection == SANE_EPSONDS_USB) {
size_t n = length;
*status = sanei_usb_write_bulk(s->fd, buf, &n);
return n;
}
/* never reached */
*status = SANE_STATUS_INVAL;
return 0;
}
size_t eds_recv(epsonds_scanner *s, void *buf, size_t length, SANE_Status *status)
{
size_t n = 0;
DBG(30, "%s: size = %ld, buf = %p\n", __func__, (long) length, buf);
if (s->hw->connection == SANE_EPSONDS_NET) {
/* XXX */
} else if (s->hw->connection == SANE_EPSONDS_USB) {
/* !!! only report an error if we don't read anything */
n = length;
*status = sanei_usb_read_bulk(s->fd, (SANE_Byte *)buf,
(size_t *) &n);
if (n > 0)
*status = SANE_STATUS_GOOD;
}
if (n < length) {
DBG(1, "%s: expected = %lu, got = %ld, canceling: %d\n", __func__,
(u_long)length, (long)n, s->canceling);
*status = SANE_STATUS_IO_ERROR;
}
return n;
}
/* Simple function to exchange a fixed amount of data with the scanner */
SANE_Status eds_txrx(epsonds_scanner* s, char *txbuf, size_t txlen,
char *rxbuf, size_t rxlen)
{
SANE_Status status;
size_t done;
done = eds_send(s, txbuf, txlen, &status);
if (status != SANE_STATUS_GOOD) {
DBG(1, "%s: tx err, %s\n", __func__, sane_strstatus(status));
return status;
}
if (done != txlen) {
DBG(1, "%s: tx err, short write\n", __func__);
return SANE_STATUS_IO_ERROR;
}
done = eds_recv(s, rxbuf, rxlen, &status);
if (status != SANE_STATUS_GOOD) {
DBG(1, "%s: rx err, %s\n", __func__, sane_strstatus(status));
}
return status;
}
/* This function should be used to send codes that only requires the scanner
* to give back an ACK or a NAK, namely FS X or FS Y
*/
SANE_Status eds_control(epsonds_scanner *s, void *buf, size_t buf_size)
{
char result;
SANE_Status status;
DBG(12, "%s: size = %lu\n", __func__, (u_long) buf_size);
status = eds_txrx(s, buf, buf_size, &result, 1);
if (status != SANE_STATUS_GOOD) {
DBG(1, "%s: failed, %s\n", __func__, sane_strstatus(status));
return status;
}
if (result == ACK)
return SANE_STATUS_GOOD;
if (result == NAK) {
DBG(3, "%s: NAK\n", __func__);
return SANE_STATUS_INVAL;
}
DBG(1, "%s: result is neither ACK nor NAK but 0x%02x\n",
__func__, result);
return SANE_STATUS_INVAL;
}
SANE_Status eds_fsy(epsonds_scanner *s)
{
return eds_control(s, "\x1CY", 2);
}
SANE_Status eds_fsx(epsonds_scanner *s)
{
SANE_Status status = eds_control(s, "\x1CX", 2);
if (status == SANE_STATUS_GOOD) {
s->locked = 1;
}
return status;
}
SANE_Status eds_lock(epsonds_scanner *s)
{
SANE_Status status;
DBG(5, "%s\n", __func__);
if (s->hw->connection == SANE_EPSONDS_USB) {
sanei_usb_set_timeout(USB_SHORT_TIMEOUT);
}
status = eds_fsx(s);
if (s->hw->connection == SANE_EPSONDS_USB) {
sanei_usb_set_timeout(USB_TIMEOUT);
}
return status;
}
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