Re: Raspberry Pi 3B USB Printing Issue

On Sat, Mar 12, 2022 at 4:41 PM Hans Petter Selasky <hps@selasky.org> wrote:

> On 3/12/22 08:07, Archimedes Gaviola wrote:
> > ugen1.5: <EPSON EPSON UB-U03II> at usbus1
> > ulpt1 on uhub1
> > ulpt1: <EPSON EPSON UB-U03II, class 0/0, rev 1.10/2.00, addr 5> on usbus1
> > device_attach: ulpt1 attach returned 12
>
> 12 : man errno :
>       12 ENOMEM Cannot allocate memory.
>
> I guess the EPSON printer you've got is not compatible with ulpt<n>
>
> When printing, can you make sure that the length transferred is never a
> multiple of 64 bytes?
>
> Also, there might be a bug lurking in the USB host controller driver,
> like already mentioned.
>


Hi Hans,

I just figured-out the ulpt(4) driver in my Epson printer while comparing
with my Xprinter printer's USB device info. My Epson printer is providing
vendor specific values of 255 in the bInterfaceClass and bInterfaceSubClass
respectively.

      bInterfaceClass = 0x00ff  <Vendor specific>
      bInterfaceSubClass = 0x00ff

It should be a value of 7 for bInterfaceClass and a value of 1 in
bInterfaceSubClass.

      bInterfaceClass = 0x0007  <Printer device>
      bInterfaceSubClass = 0x0001

So, the ulpt_attach() routine below will break upon validation for
mismatched values in UICLASS_PRINTER and  UISUBCLASS_PRINTER.

                        } else {
                                alt_index++;
                                if ((id->bInterfaceClass ==
UICLASS_PRINTER) &&
                                    (id->bInterfaceSubClass ==
UISUBCLASS_PRINTER) &&
                                    (id->bInterfaceProtocol ==
UIPROTO_PRINTER_BI)) {
                                        goto found;
                                }
                        }

What I did is temporarily replace these values in the USB definition. In
this case, how should the project handle this non-compliance USB devices?
Though I will raise this to Epson if they could provide an updated firmware.

freebsd@generic:~ % diff -Nur /usr/src/sys/dev/usb/usb.h.orig
/usr/src/sys/dev/usb/usb.h
--- /usr/src/sys/dev/usb/usb.h.orig     2022-03-27 02:55:01.319235000 +0800
+++ /usr/src/sys/dev/usb/usb.h  2022-03-27 02:57:10.608518000 +0800
@@ -459,8 +459,10 @@
 #define        UICLASS_PHYSICAL        0x05
 #define        UICLASS_IMAGE           0x06
 #define        UISUBCLASS_SIC          1       /* still image class */
-#define        UICLASS_PRINTER         0x07
-#define        UISUBCLASS_PRINTER      1
+/* #define     UICLASS_PRINTER         0x07 */
+/* #define     UISUBCLASS_PRINTER      1 */
+#define        UICLASS_PRINTER         0xff
+#define        UISUBCLASS_PRINTER      0xff

I can print now with ulpt(4) driver but need further testing for any issues.

ugen1.5: <EPSON EPSON UB-U03II> at usbus1
ulpt0 on uhub1
ulpt0: <EPSON EPSON UB-U03II, class 0/0, rev 1.10/2.00, addr 5> on usbus1
ulpt_attach: setting alternate config number: 0
ulpt0: using bi-directional mode

Thanks,
Archimedes