Messages in this thread Patch in this message | | | From | William Sung <> | Subject | [PATCH 1/2] usb: serial: option: Fix the lackage for Quectel EG95 LTE modem support | Date | Tue, 1 Sep 2020 13:00:21 +0800 |
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* Add reset-resume callback for resetting USB devices after MCU exits from suspend/sleep mode.
* Because Quectel EG95 uses USB interface 4 as a USB network device, so return from option_startup() to prevent being used as a USB serial device.
Fixes: da6902e5b6db ("USB: serial: option: add Quectel EG95 LTE modem"
Signed-off-by: William Sung <william.sung@advantech.com.tw> --- drivers/usb/serial/option.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c index 89b3192af326..9de8aec47e5e 100644 --- a/drivers/usb/serial/option.c +++ b/drivers/usb/serial/option.c @@ -2069,6 +2069,7 @@ static struct usb_serial_driver option_1port_device = { #ifdef CONFIG_PM .suspend = usb_wwan_suspend, .resume = usb_wwan_resume, + .reset_resume = usb_wwan_resume, #endif }; @@ -2104,6 +2105,11 @@ static int option_probe(struct usb_serial *serial, if (device_flags & NUMEP2 && iface_desc->bNumEndpoints != 2) return -ENODEV; + /* Quectel EC25 & EC21 & EG91 & EG95 ... interface 4 can be used as USB network device */ + if (serial->dev->descriptor.idVendor == cpu_to_le16(0x2c7c) && + serial->interface->cur_altsetting->desc.bInterfaceNumber >= 4) + return -ENODEV; + /* Store the device flags so we can use them during attach. */ usb_set_serial_data(serial, (void *)device_flags); -- 2.17.1
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