Re: Problem with Epson Pos Printer

On Thu, 8 Mar 2007, Linos wrote:

> Wow your trick save my life :), it works like a charm, it detects now
> and print very well in cups hehehe, many thanks Alan. The problem i have
> now it is that i will have to patch any new kernel version with this
> hack and i will have to admin about 70 Debian machines with different
> hardware, i think that without debian binary kernels can be like live in
> the hell. Do you know any way to try that it would be patched in
> mainstream linux kernel? 

Okay, below is a patch you should test.  If it works, I will submit it to 
be included in the kernel.

Alan Stern


Index: usb-2.6/drivers/usb/class/usblp.c
===================================================================
--- usb-2.6.orig/drivers/usb/class/usblp.c
+++ usb-2.6/drivers/usb/class/usblp.c
@@ -202,6 +202,7 @@ struct quirk_printer_struct {
 
 #define USBLP_QUIRK_BIDIR	0x1	/* reports bidir but requires unidirectional mode (no INs/reads) */
 #define USBLP_QUIRK_USB_INIT	0x2	/* needs vendor USB init string */
+#define USBLP_QUIRK_BAD_CLASS	0x4	/* descriptor uses vendor-specific Class or SubClass */
 
 static const struct quirk_printer_struct quirk_printers[] = {
 	{ 0x03f0, 0x0004, USBLP_QUIRK_BIDIR }, /* HP DeskJet 895C */
@@ -218,6 +219,7 @@ static const struct quirk_printer_struct
 	{ 0x0409, 0xf0be, USBLP_QUIRK_BIDIR }, /* NEC Picty920 (HP OEM) */
 	{ 0x0409, 0xf1be, USBLP_QUIRK_BIDIR }, /* NEC Picty800 (HP OEM) */
 	{ 0x0482, 0x0010, USBLP_QUIRK_BIDIR }, /* Kyocera Mita FS 820, by zut <[email protected]> */
+	{ 0x04b8, 0x0202, USBLP_QUIRK_BAD_CLASS }, /* Seiko Epson Receipt Printer M129C */
 	{ 0, 0 }
 };
 
@@ -1048,7 +1050,8 @@ static int usblp_select_alts(struct usbl
 		ifd = &if_alt->altsetting[i];
 
 		if (ifd->desc.bInterfaceClass != 7 || ifd->desc.bInterfaceSubClass != 1)
-			continue;
+			if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS))
+				continue;
 
 		if (ifd->desc.bInterfaceProtocol < USBLP_FIRST_PROTOCOL ||
 		    ifd->desc.bInterfaceProtocol > USBLP_LAST_PROTOCOL)


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