From: John Youn Date: Sat, 6 Feb 2016 01:05:12 +0000 (-0800) Subject: usb: ch9: Add size macro for SSP dev cap descriptor X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=446fa3a95df1e8b78f25e1babc41e46edd200821;p=linux-beck.git usb: ch9: Add size macro for SSP dev cap descriptor The SuperspeedPlus Device Capability Descriptor has a variable size depending on the number of sublink speed attributes. This patch adds a macro to calculate that size. The macro takes one argument, the Sublink Speed Attribute Count (SSAC) as reported by the descriptor in bmAttributes[4:0]. See USB 3.1 9.6.2.5, Table 9-19. Signed-off-by: John Youn Signed-off-by: Felipe Balbi --- diff --git a/include/uapi/linux/usb/ch9.h b/include/uapi/linux/usb/ch9.h index 252ac16635dc..28bee8d44735 100644 --- a/include/uapi/linux/usb/ch9.h +++ b/include/uapi/linux/usb/ch9.h @@ -923,6 +923,12 @@ struct usb_ptm_cap_descriptor { __u8 bDevCapabilityType; } __attribute__((packed)); +/* + * The size of the descriptor for the Sublink Speed Attribute Count + * (SSAC) specified in bmAttributes[4:0]. + */ +#define USB_DT_USB_SSP_CAP_SIZE(ssac) (16 + ssac * 4) + /*-------------------------------------------------------------------------*/ /* USB_DT_WIRELESS_ENDPOINT_COMP: companion descriptor associated with