[sane-devel] Help with usb AGFA 1212U an libusb

[Jose Alberto Reguero]

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I patch the code to count urb packets as suggested in:
http://lists.alioth.debian.org/pipermail/sane-devel/2004-March/010534.html
and I have some success, but it don't work well absolutely.
I think that the problem is in th count of  the urb read packets, and perhaps 
there is a better solution to make the number of packets even.
I attach the patch.
Thanks.
Jose Alberto Reguero.






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--- snapscan-usb.c	2004-04-07 19:18:21.189514624 +0200
+++ snapscan-usb.c.coque	2004-04-07 19:17:59.742775024 +0200
@@ -96,6 +96,8 @@
 static struct sembuf sem_signal = { 0, 1, 0 };
 static sense_handler_type usb_sense_handler;
 static void* usb_pss;
+static int read_urb = 0;
+static int write_urb = 0;
 
 /* Forward declarations */
 static SANE_Status usb_request_sense(SnapScan_Scanner *pss);
@@ -186,6 +188,36 @@
 
     DBG (DL_CALL_TRACE, "%s(%d)\n", me, fd);
     semctl(sem_id, 0, IPC_RMID, dummy_semun_arg);
+    printf ("1 read %d write %d\n", read_urb, write_urb);
+    if ((read_urb % 2) == 1 && (write_urb % 2) == 1)
+    {
+        char cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0};
+
+        snapscani_usb_cmd (fd, cmd, sizeof (cmd), NULL, 0);
+    }
+    else if ((read_urb % 2) == 1)
+    {
+        size_t read_bytes;
+        char cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0};
+        char cmd2[] = {INQUIRY, 0, 0, 0, 120, 0};
+        char data[120];
+
+        read_bytes = 120;
+        snapscani_usb_cmd (fd, cmd2, sizeof (cmd2), data, &read_bytes);
+        snapscani_usb_cmd (fd, cmd, sizeof (cmd), NULL, 0);
+    }
+    else if ((write_urb %1) == 1)
+    {
+        size_t read_bytes;
+        char cmd[] = {INQUIRY, 0, 0, 0, 120, 0};
+        char data[120];
+
+        read_bytes = 120;
+        snapscani_usb_cmd (fd, cmd, sizeof (cmd), data, &read_bytes);
+    }
+    printf ("2 read %d write %d\n", read_urb, write_urb);
+    read_urb = 0;
+    write_urb = 0;
     sanei_usb_close(fd);
 }
 
@@ -241,6 +273,8 @@
         DBG (DL_MAJOR_ERROR, "%s Only %d bytes written\n",me,bytes_written);
         status = SANE_STATUS_IO_ERROR;
     }
+    write_urb++;
+    printf ("write %d\n",n);
     return status;
 }
 
@@ -255,6 +289,8 @@
         DBG (DL_MAJOR_ERROR, "%s Only %d bytes read\n",me,bytes_read);
         status = SANE_STATUS_IO_ERROR;
     }
+    read_urb += ((63 + n) / 64); 
+    printf ("read %d\n",n);
 
     DBG(DL_DATA_TRACE, "%s: reading: %s\n",me,usb_debug_data(dbgmsg,buf,n));
     return status;

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