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USB: cdc-acm: ignore Exar XR21V141X when serial driver is built 

The Exar XR21V141X can be used in either ACM mode using the cdc-acm
driver or in "custom driver" mode in which further features such as
hardware and software flow control, GPIO control and in-band line-status
reporting are available.

In ACM mode the device always enables RTS/CTS flow control, something
which could prevent transmission in case the CTS input isn't wired up
correctly.

Ensure that cdc_acm will not bind to the device if the custom USB-serial
driver is enabled.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://lore.kernel.org/r/20201122170822.21715-4-mani@kernel.org
[ johan: rewrite commit message ]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2020-11-22 22:38:22 +05:30 committed by Johan Hovold
parent c2d405aa86
commit 5f6225a7fb
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/class/cdc-acm.c
View File

@ -1901,6 +1901,12 @@ 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,