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authorMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-11-22 22:38:22 +0530
committerJohan Hovold <johan@kernel.org>2021-01-21 10:49:45 +0100
commit5f6225a7fb2c863ca40ca282478933c0afdb3512 (patch)
tree328393c1e9c8def5411dd09ada8ca2dc86a6e92d /drivers/usb/class
parentc2d405aa86b451f197ee95cb08887130b86b765e (diff)
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>
Diffstat (limited to 'drivers/usb/class')
-rw-r--r--drivers/usb/class/cdc-acm.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 781905745812..37f824b59daa 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -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,