* [1/1] usb: cdc-acm: send ZLP for Telit 3G Intel based modems
@ 2018-12-28 15:15 Daniele Palmas
0 siblings, 0 replies; only message in thread
From: Daniele Palmas @ 2018-12-28 15:15 UTC (permalink / raw)
To: Johan Hovold, Oliver Neukum; +Cc: linux-usb, Daniele Palmas
Telit 3G Intel based modems require zero packet to be sent if
out data size is equal to the endpoint max packet size.
Signed-off-by: Daniele Palmas <dnlplm@gmail.com>
---
drivers/usb/class/cdc-acm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 1b68fed..195fb83 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1855,6 +1855,13 @@ static const struct usb_device_id acm_ids[] = {
.driver_info = IGNORE_DEVICE,
},
+ { USB_DEVICE(0x1bc7, 0x0021), /* Telit 3G ACM only composition */
+ .driver_info = SEND_ZERO_PACKET,
+ },
+ { USB_DEVICE(0x1bc7, 0x0023), /* Telit 3G ACM + ECM composition */
+ .driver_info = SEND_ZERO_PACKET,
+ },
+
/* control interfaces without any protocol set */
{ USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_ACM,
USB_CDC_PROTO_NONE) },
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