linux-kernel - [PATCH v4 3/3] usb: cdc-acm: Ignore Exar XR21V141X when serial driver is built

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Date:   Sun,  7 Jun 2020 21:38:09 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     johan@...nel.org, gregkh@...uxfoundation.org
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        patong.mxl@...il.com, linus.walleij@...aro.org,
        mchehab+huawei@...nel.org, Manivannan Sadhasivam <mani@...nel.org>
Subject: [PATCH v4 3/3] usb: cdc-acm: Ignore Exar XR21V141X when serial driver is built

From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

The RTS/CTS line discipline for this device doesn't follow
the standard. So, in order to properly support TX, a separate
driver is needed.

Ensure that cdc_acm will ignore it during probe time, if the
Kernel is built with support for it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Signed-off-by: Manivannan Sadhasivam <mani@...nel.org>
---
 drivers/usb/class/cdc-acm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 84d6f7df09a4..30e20d06d044 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1864,6 +1864,12 @@ static const struct usb_device_id acm_ids[] = {
 	},
 #endif
 
+#if IS_ENABLED(CONFIG_USB_SERIAL_XR)
+	{ USB_DEVICE(0x04e2, 0x1410),   /* Ignore XR21V141X USB to Serial converter */
+	.driver_info = IGNORE_DEVICE,
+	},
+#endif
+
 	/*Samsung phone in firmware update mode */
 	{ USB_DEVICE(0x04e8, 0x685d),
 	.driver_info = IGNORE_DEVICE,
-- 
2.17.1