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usb: gadget: f_ncm: Fix NTP-32 support (Windows NCM RX) #123

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usb: gadget: f_ncm: Fix NTP-32 support (Windows NCM RX) #123

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10 changes: 3 additions & 7 deletions drivers/usb/gadget/function/f_ncm.c
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Original file line number Diff line number Diff line change
Expand Up @@ -38,9 +38,7 @@

/* to trigger crc/non-crc ndp signature */

#define NCM_NDP_HDR_CRC_MASK 0x01000000
#define NCM_NDP_HDR_CRC 0x01000000
#define NCM_NDP_HDR_NOCRC 0x00000000

enum ncm_notify_state {
NCM_NOTIFY_NONE, /* don't notify */
Expand Down Expand Up @@ -530,6 +528,7 @@ static inline void ncm_reset_values(struct f_ncm *ncm)
{
ncm->parser_opts = &ndp16_opts;
ncm->is_crc = false;
ncm->ndp_sign = ncm->parser_opts->ndp_sign;
ncm->port.cdc_filter = DEFAULT_FILTER;

/* doesn't make sense for ncm, fixed size used */
Expand Down Expand Up @@ -809,25 +808,20 @@ static int ncm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
| USB_CDC_SET_CRC_MODE:
{
int ndp_hdr_crc = 0;

if (w_length != 0 || w_index != ncm->ctrl_id)
goto invalid;
switch (w_value) {
case 0x0000:
ncm->is_crc = false;
ndp_hdr_crc = NCM_NDP_HDR_NOCRC;
DBG(cdev, "non-CRC mode selected\n");
break;
case 0x0001:
ncm->is_crc = true;
ndp_hdr_crc = NCM_NDP_HDR_CRC;
DBG(cdev, "CRC mode selected\n");
break;
default:
goto invalid;
}
ncm->ndp_sign = ncm->parser_opts->ndp_sign | ndp_hdr_crc;
value = 0;
break;
}
Expand All @@ -844,6 +838,8 @@ static int ncm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
ctrl->bRequestType, ctrl->bRequest,
w_value, w_index, w_length);
}
ncm->ndp_sign = ncm->parser_opts->ndp_sign |
(ncm->is_crc ? NCM_NDP_HDR_CRC : 0);

/* respond with data transfer or status phase? */
if (value >= 0) {
Expand Down