-ca draft

5 files changed, 251 insertions, 12 deletions

diff --git a/README b/README
index 3280379..1aff695 100644
--- a/README
+++ b/README
@@ -1,14 +1,14 @@
-# GNU Taler snack machine
+# GNU Taler hardware integrations
 
-#### Author(s)
-  * BOSS Marco
-  * HOFER Dominik
-  * GROTHOFF Christian
+* snack machine (taler-mdb)
+* coin acceptor (taler-coin-acceptor)
+* cash acceptor (TBD)
 
 #### Prerequisites
   * GNU gcc tool-chain
   * C standard libraries
   * libnfc
+  * libusb
   * libcurl/libgnurl
   * libjansson
   * GNU make
@@ -27,10 +27,13 @@
   * Adafruit PiTFT 3.5" display
 
 #### Description
-This is a app to run a snack machine as Taler merchant with NFC payment interface.
-Optionally there can a QRCode be shown on a display to get the payment link.
+
+taler-mdb is a app to run a snack machine as Taler merchant with NFC
+payment interface.  Optionally there can a QRCode be shown on a
+display to get the payment link.
 
 #### Remarks
+
   * When using an ACR122 device there may be problems with libnfc.
     [see here](https://github.com/nfc-tools/libnfc) for further information
   * At the moment there is no option to cross compile
@@ -45,5 +48,6 @@ Building should be easily done with the following three commands:
   ```
 
 #### Configuration
-To configure the merchants backend and the product numbers of the snack machine edit
-taler.conf file.
+
+To configure the merchants backend and the product numbers of the
+snack machine edit taler.conf file.
diff --git a/configure.ac b/configure.ac
index 7c9c084..1b9d517 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3,7 +3,7 @@
 
 AC_PREREQ([2.69])
 AC_INIT([taler-mdb], [0.8.2], [taler@gnu.org])
-AC_CONFIG_SRCDIR([src/main.c])
+AC_CONFIG_SRCDIR([src/taler-mdb.c])
 AC_CONFIG_HEADERS([config.h])
 
 # Checks for programs.
@@ -13,9 +13,15 @@ AC_PROG_CC
 # Checks for libraries.
 AC_CHECK_LIB([nfc], [nfc_open])
 
+# Checks for libraries.
+AC_CHECK_LIB([usb], [libusb_init])
+
 # Checks for header files.
 AC_CHECK_HEADERS([stdlib.h string.h unistd.h sys/un.h netinet/in.h netinet/ip.h])
 
+# Checks for header files.
+AC_CHECK_HEADERS([libusb-1.0/libusb.h])
+
 # Checks for typedefs, structures, and compiler characteristics.
 AC_CHECK_HEADER_STDBOOL
 AC_TYPE_SIZE_T
diff --git a/src/Makefile.am b/src/Makefile.am
index f018f6d..86ddd3b 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,5 +1,7 @@
 # This Makefile.am is in the public domain
-bin_PROGRAMS = taler-mdb
+bin_PROGRAMS = \
+  taler-coin-acceptor \
+  taler-mdb
 
 if HAVE_QR
 bin_PROGRAMS += qr-show
@@ -10,8 +12,13 @@ if USE_COVERAGE
   XLIB = -lgcov
 endif
 
+taler_coin_acceptor_SOURCES = \
+  taler-coin-acceptor.c
+taler_coin_acceptor_LDADD = \
+  -lusb-1.0
+
 taler_mdb_SOURCES = \
-  main.c
+  taler-mdb.c
 taler_mdb_LDADD = \
   -ltalermerchant \
   -ltalerjson \
diff --git a/src/taler-coin-acceptor.c b/src/taler-coin-acceptor.c
new file mode 100644
index 0000000..fde4a8a
--- /dev/null
+++ b/src/taler-coin-acceptor.c
@@ -0,0 +1,222 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2022 Taler Systems SA
+
+ TALER 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 3, or (at your option) any later version.
+
+ TALER 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
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+*/
+
+/**
+ * @brief Program to talk to the coin acceptor via USB-RS232.
+ *
+ * @author Christian Grothoff
+ */
+#include "config.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <libusb-1.0/libusb.h>
+
+// FIXME: make this configurable later...
+/* future technology devices international */
+#define VENDOR_ID      0x0403
+/* FT232 Serial UART IC */
+#define PRODUCT_ID     0x6001
+
+#define USB_CTL_REQ_SET_LINE_CODING 0x20
+
+#define LEO_ONE_STOP_BIT 0x00
+#define LEO_ONEHALF_STOP_BIT 0x01
+#define LEO_TWO_STOP_BIT 0x02
+
+#define LEO_PARITY_NONE 0x00
+#define LEO_PARITY_ODD 0x01
+#define LEO_PARITY_EVEN 0x02
+#define LEO_PARITY_MARK 0x03
+#define LEO_PARITY_SPACE 0x04
+
+
+#define ACM_CTRL_DTR   0x01
+#define ACM_CTRL_RTS   0x02
+
+/**
+ * Handle to USB device.
+ */
+static struct libusb_device_handle *device_handle;
+
+/* The Endpoint address are hard coded. You should use lsusb -v to find
+ * the values corresponding to your device.
+ */
+static int ep_in_addr  = 0x83;
+static int ep_out_addr = 0x02;
+
+
+static int
+read_char (void)
+{
+  int actual_length;
+  unsigned char data;
+  int rc;
+
+  rc = libusb_bulk_transfer (device_handle,
+                             ep_in_addr,
+                             &data,
+                             sizeof (data),
+                             &actual_length,
+                             1000 /* timeout? */);
+  if (rc == LIBUSB_ERROR_TIMEOUT)
+  {
+    fprintf (stderr,
+             "TIMEOUT\n");
+    return EOF;
+  }
+  if (rc < 0)
+  {
+    fprintf (stderr,
+             "Error %s while waiting for char\n",
+             libusb_error_name (rc));
+    return EOF;
+  }
+  return data;
+}
+
+
+int
+main (int argc,
+      char **argv)
+{
+  int rc;
+
+  rc = libusb_init (NULL);
+  if (rc < 0)
+  {
+    fprintf (stderr,
+             "Error initializing usb: %s\n",
+             libusb_error_name (rc));
+    return 1;
+  }
+
+  libusb_set_debug (NULL,
+                    3);
+  device_handle = libusb_open_device_with_vid_pid (NULL,
+                                                   VENDOR_ID,
+                                                   PRODUCT_ID);
+  if (NULL == device_handle)
+  {
+    fprintf (stderr,
+             "Error finding USB device\n");
+    libusb_exit (NULL);
+    return 1;
+  }
+
+  /* Maybe there is someone else attached, detach other drivers from
+     all the USB interfaces. NOTE: not sure if there are *2*!  */
+  for (int if_num = 0; if_num < 2; if_num++)
+  {
+    if (libusb_kernel_driver_active (device_handle,
+                                     if_num))
+    {
+      libusb_detach_kernel_driver (device_handle,
+                                   if_num);
+    }
+    rc = libusb_claim_interface (device_handle,
+                                 if_num);
+    if (rc < 0)
+    {
+      fprintf (stderr,
+               "Error claiming interface: %s\n",
+               libusb_error_name (rc));
+      libusb_close (device_handle);
+      libusb_exit (NULL);
+      return 1;
+    }
+  }
+#if 1
+  rc = libusb_control_transfer (device_handle,
+                                0x21,
+                                0x22,
+                                ACM_CTRL_DTR | ACM_CTRL_RTS,
+                                0,
+                                NULL,
+                                0,
+                                0);
+  if (rc < 0)
+  {
+    fprintf (stderr,
+             "Error during control transfer: %s\n",
+             libusb_error_name (rc));
+    libusb_close (device_handle);
+    libusb_exit (NULL);
+    return 1;
+  }
+#endif
+
+  /* - set line encoding: here 9600 8N1
+   * 9600 = 0x2580 ~> 0x80, 0x25 in little endian
+   */
+  {
+    struct LineEncodingOptions
+    {
+      /**
+       * In *little* endian.
+       */
+      uint32_t baud_rate;
+      uint8_t b_char_format;
+      uint8_t b_parity_type;
+      uint8_t b_data_bits;
+    } leo = {
+      .baud_rate = __builtin_bswap32 (htonl (4800)),
+      .b_char_format = LEO_ONE_STOP_BIT,
+      .b_parity_type = LEO_PARITY_ODD,
+      .b_data_bits = 0x08
+    };
+
+    rc = libusb_control_transfer (device_handle,
+                                  0x21,
+                                  USB_CTL_REQ_SET_LINE_CODING,
+                                  0,
+                                  0,
+                                  (unsigned char *) &leo,
+                                  sizeof(leo),
+                                  0);
+    if (rc < 0)
+    {
+      fprintf (stderr,
+               "Error during control transfer: %s\n",
+               libusb_error_name (rc));
+      libusb_close (device_handle);
+      libusb_exit (NULL);
+      return 1;
+    }
+  }
+
+  /* FIXME: proper event loop... */
+  while (1)
+  {
+    int in = read_char ();
+
+    if (-1 != in)
+      fprintf (stdout,
+               "Received: %d\n",
+               in);
+  }
+
+  libusb_release_interface (device_handle,
+                            0);
+  libusb_close (device_handle);
+  libusb_exit (NULL);
+  return 0;
+}
diff --git a/src/main.c b/src/taler-mdb.c
index f0b1529..f0b1529 100644
--- a/src/main.c
+++ b/src/taler-mdb.c