* 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@xxxxxxxxxxxxxxxx>
---
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
