Release 1.0.25+git20150425-1

1 files changed, 177 insertions, 0 deletions

diff --git a/backend/epsonds-io.c b/backend/epsonds-io.c
new file mode 100644
index 0000000..28bacfc
--- /dev/null
+++ b/backend/epsonds-io.c
@@ -0,0 +1,177 @@
+/*
+ * 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;
+}
+
+