linux-kernel - [PATCH] cdc-acm: Add DISABLE_ECHO quirk for GE HealthCare UI Controller

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Message-Id: <20240814072905.2501-1-ian.ray@gehealthcare.com>
Date: Wed, 14 Aug 2024 10:29:05 +0300
From: Ian Ray <ian.ray@...ealthcare.com>
To: Oliver Neukum <oneukum@...e.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Ian Ray <ian.ray@...ealthcare.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] cdc-acm: Add DISABLE_ECHO quirk for GE HealthCare UI Controller

USB_DEVICE(0x1901, 0x0006) may send data before cdc_acm is ready, which
may be misinterpreted in the default N_TTY line discipline.

Signed-off-by: Ian Ray <ian.ray@...ealthcare.com>
---
 drivers/usb/class/cdc-acm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 0e7439dba8fe..0c1b69d944ca 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1761,6 +1761,9 @@ static const struct usb_device_id acm_ids[] = {
 	{ USB_DEVICE(0x11ca, 0x0201), /* VeriFone Mx870 Gadget Serial */
 	.driver_info = SINGLE_RX_URB,
 	},
+	{ USB_DEVICE(0x1901, 0x0006), /* GE Healthcare Patient Monitor UI Controller */
+	.driver_info = DISABLE_ECHO, /* DISABLE ECHO in termios flag */
+	},
 	{ USB_DEVICE(0x1965, 0x0018), /* Uniden UBC125XLT */
 	.driver_info = NO_UNION_NORMAL, /* has no union descriptor */
 	},
-- 
2.39.2