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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 <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
John Youn 2016-02-05 17:05:12 -08:00 committed by Felipe Balbi
parent 7b05d3b374
commit 446fa3a95d
1 changed files with 6 additions and 0 deletions
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6
include/uapi/linux/usb/ch9.h
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@ -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