diff options
Diffstat (limited to 'sys/dev/usb/usb_parse.c')
| -rw-r--r-- | sys/dev/usb/usb_parse.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/sys/dev/usb/usb_parse.c b/sys/dev/usb/usb_parse.c index deb52ea..8663c1e 100644 --- a/sys/dev/usb/usb_parse.c +++ b/sys/dev/usb/usb_parse.c @@ -180,7 +180,7 @@ usb_edesc_foreach(struct usb_config_descriptor *cd, } if (desc->bDescriptorType == UDESC_ENDPOINT) { if (desc->bLength < sizeof(*ped)) { - /* endpoint index is invalid */ + /* endpoint descriptor is invalid */ break; } return ((struct usb_endpoint_descriptor *)desc); @@ -190,6 +190,42 @@ usb_edesc_foreach(struct usb_config_descriptor *cd, } /*------------------------------------------------------------------------* + * usb_ed_comp_foreach + * + * This function will iterate all the endpoint companion descriptors + * within an endpoint descriptor in an interface descriptor. Starting + * value for the "ped" argument should be a valid endpoint companion + * descriptor. + * + * Return values: + * NULL: End of descriptors + * Else: A valid endpoint companion descriptor + *------------------------------------------------------------------------*/ +struct usb_endpoint_ss_comp_descriptor * +usb_ed_comp_foreach(struct usb_config_descriptor *cd, + struct usb_endpoint_ss_comp_descriptor *ped) +{ + struct usb_descriptor *desc; + + desc = ((struct usb_descriptor *)ped); + + while ((desc = usb_desc_foreach(cd, desc))) { + if (desc->bDescriptorType == UDESC_INTERFACE) + break; + if (desc->bDescriptorType == UDESC_ENDPOINT) + break; + if (desc->bDescriptorType == UDESC_ENDPOINT_SS_COMP) { + if (desc->bLength < sizeof(*ped)) { + /* endpoint companion descriptor is invalid */ + break; + } + return ((struct usb_endpoint_ss_comp_descriptor *)desc); + } + } + return (NULL); +} + +/*------------------------------------------------------------------------* * usbd_get_no_descriptors * * This function will count the total number of descriptors in the |
