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authorJörg Frings-Fürst <debian@jff-webhosting.net>2015-04-27 06:51:24 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2015-04-27 06:51:24 +0200
commitf3843702a12cf46f9cd4d1be772055ec6893a1bb (patch)
tree3f3d8fe1f2b756dc2cd9fcff7b2e8e53539278ba /backend/epsonds-io.c
parentb2802d98d4486d6afc585062f4ca02fddf829dc5 (diff)
Release 1.0.25+git20150425-1
Diffstat (limited to 'backend/epsonds-io.c')
-rw-r--r--backend/epsonds-io.c177
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;
+}
+
+