On 23.06.22 10:55, Chris Ruehl wrote:
> Apply the patch ,
> still no /dev/ttyACM0 comes up.
Hi,
I am a stupid fool who cannot tell apart "&&" and "||"
Plesae test the attached patch.
Regards
Oliver
From ccf6a8654bc503d9e1cd75f038f4c4c6154716e3 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@xxxxxxxx>
Date: Thu, 23 Jun 2022 10:22:47 +0200
Subject: [PATCH] cdc-acm: adding a special case for OMRON device
This device has a collapsed interface with a mysterious
fourth endpoint. We ignore that endpoint.
Signed-off-by: Oliver Neukum <oneukum@xxxxxxxx>
---
drivers/usb/class/cdc-acm.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index fedf3065670e..149902e301d8 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1215,7 +1215,12 @@ static int acm_probe(struct usb_interface *intf,
call_intf_num = cmgmd->bDataInterface;
if (!union_header) {
- if (intf->cur_altsetting->desc.bNumEndpoints == 3) {
+ if (intf->cur_altsetting->desc.bNumEndpoints == 3 ||
+ /*
+ * an odd device from OMRON has a mysterious
+ * unnecessary fourth endpoint
+ */
+ intf->cur_altsetting->desc.bNumEndpoints == 4) {
dev_dbg(&intf->dev, "No union descriptor, assuming single interface\n");
combined_interfaces = 1;
control_interface = data_interface = intf;
--
2.35.3
