Em Fri, 1 May 2020 00:19:22 +0530 mani@xxxxxxxxxx escreveu: > From: Manivannan Sadhasivam <mani@xxxxxxxxxx> > > Hello, > > This series adds support for MaxLinear/Exar USB to serial converters. > This driver only supports XR21V141X series but it can easily be extended > to other series in future. > > This driver is inspired from the initial one submitted by Patong Yang: > > https://patchwork.kernel.org/patch/10543261/ > > While the initial driver was a custom tty USB driver exposing whole > new serial interface ttyXRUSBn, this version is completely based on USB > serial core thus exposing the interfaces as ttyUSBn. This will avoid > the overhead of exposing a new USB serial interface which the userspace > tools are unaware of. Hmm... I guess you also need the enclosed patch, to ensure that cdc_acm won't try to hijack it, when the Kernel is built with both drivers. Thanks, Mauro [PATCH] usb: cdc-acm: ignore Exar XR21V141X when serial driver is built 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@xxxxxxxxxx> diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index ded8d93834ca..f87288834ded 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1889,7 +1889,11 @@ static const struct usb_device_id acm_ids[] = { .driver_info = IGNORE_DEVICE, }, #endif - +#if IS_ENABLED(CONFIG_USB_SERIAL_XR) + { USB_DEVICE(0x04e2, 0x1410), /* XR21V141X uses a different rts/cts discipline */ + .driver_info = IGNORE_DEVICE, + }, +#endif /*Samsung phone in firmware update mode */ { USB_DEVICE(0x04e8, 0x685d), .driver_info = IGNORE_DEVICE,
