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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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672027a357
Add argumentation in defense of using __attribute__((packed)) in USB descriptors authored by Dave Brownell. Necessary as in some cases it seems superfluous. Signed-off-by: Inaky Perez-Gonzalez <inaky@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
578 lines
17 KiB
C
578 lines
17 KiB
C
/*
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* This file holds USB constants and structures that are needed for
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* USB device APIs. These are used by the USB device model, which is
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* defined in chapter 9 of the USB 2.0 specification and in the
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* Wireless USB 1.0 (spread around). Linux has several APIs in C that
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* need these:
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*
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* - the master/host side Linux-USB kernel driver API;
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* - the "usbfs" user space API; and
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* - the Linux "gadget" slave/device/peripheral side driver API.
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*
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* USB 2.0 adds an additional "On The Go" (OTG) mode, which lets systems
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* act either as a USB master/host or as a USB slave/device. That means
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* the master and slave side APIs benefit from working well together.
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*
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* There's also "Wireless USB", using low power short range radios for
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* peripheral interconnection but otherwise building on the USB framework.
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*
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* Note all descriptors are declared '__attribute__((packed))' so that:
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*
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* [a] they never get padded, either internally (USB spec writers
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* probably handled that) or externally;
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*
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* [b] so that accessing bigger-than-a-bytes fields will never
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* generate bus errors on any platform, even when the location of
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* its descriptor inside a bundle isn't "naturally aligned", and
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*
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* [c] for consistency, removing all doubt even when it appears to
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* someone that the two other points are non-issues for that
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* particular descriptor type.
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*/
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#ifndef __LINUX_USB_CH9_H
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#define __LINUX_USB_CH9_H
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#include <linux/types.h> /* __u8 etc */
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/*-------------------------------------------------------------------------*/
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/* CONTROL REQUEST SUPPORT */
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/*
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* USB directions
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*
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* This bit flag is used in endpoint descriptors' bEndpointAddress field.
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* It's also one of three fields in control requests bRequestType.
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*/
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#define USB_DIR_OUT 0 /* to device */
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#define USB_DIR_IN 0x80 /* to host */
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/*
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* USB types, the second of three bRequestType fields
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*/
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#define USB_TYPE_MASK (0x03 << 5)
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#define USB_TYPE_STANDARD (0x00 << 5)
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#define USB_TYPE_CLASS (0x01 << 5)
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#define USB_TYPE_VENDOR (0x02 << 5)
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#define USB_TYPE_RESERVED (0x03 << 5)
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/*
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* USB recipients, the third of three bRequestType fields
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*/
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#define USB_RECIP_MASK 0x1f
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#define USB_RECIP_DEVICE 0x00
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#define USB_RECIP_INTERFACE 0x01
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#define USB_RECIP_ENDPOINT 0x02
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#define USB_RECIP_OTHER 0x03
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/* From Wireless USB 1.0 */
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#define USB_RECIP_PORT 0x04
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#define USB_RECIP_RPIPE 0x05
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/*
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* Standard requests, for the bRequest field of a SETUP packet.
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*
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* These are qualified by the bRequestType field, so that for example
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* TYPE_CLASS or TYPE_VENDOR specific feature flags could be retrieved
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* by a GET_STATUS request.
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*/
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#define USB_REQ_GET_STATUS 0x00
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#define USB_REQ_CLEAR_FEATURE 0x01
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#define USB_REQ_SET_FEATURE 0x03
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#define USB_REQ_SET_ADDRESS 0x05
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#define USB_REQ_GET_DESCRIPTOR 0x06
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#define USB_REQ_SET_DESCRIPTOR 0x07
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#define USB_REQ_GET_CONFIGURATION 0x08
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#define USB_REQ_SET_CONFIGURATION 0x09
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#define USB_REQ_GET_INTERFACE 0x0A
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#define USB_REQ_SET_INTERFACE 0x0B
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#define USB_REQ_SYNCH_FRAME 0x0C
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#define USB_REQ_SET_ENCRYPTION 0x0D /* Wireless USB */
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#define USB_REQ_GET_ENCRYPTION 0x0E
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#define USB_REQ_RPIPE_ABORT 0x0E
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#define USB_REQ_SET_HANDSHAKE 0x0F
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#define USB_REQ_RPIPE_RESET 0x0F
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#define USB_REQ_GET_HANDSHAKE 0x10
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#define USB_REQ_SET_CONNECTION 0x11
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#define USB_REQ_SET_SECURITY_DATA 0x12
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#define USB_REQ_GET_SECURITY_DATA 0x13
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#define USB_REQ_SET_WUSB_DATA 0x14
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#define USB_REQ_LOOPBACK_DATA_WRITE 0x15
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#define USB_REQ_LOOPBACK_DATA_READ 0x16
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#define USB_REQ_SET_INTERFACE_DS 0x17
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/*
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* USB feature flags are written using USB_REQ_{CLEAR,SET}_FEATURE, and
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* are read as a bit array returned by USB_REQ_GET_STATUS. (So there
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* are at most sixteen features of each type.)
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*/
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#define USB_DEVICE_SELF_POWERED 0 /* (read only) */
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#define USB_DEVICE_REMOTE_WAKEUP 1 /* dev may initiate wakeup */
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#define USB_DEVICE_TEST_MODE 2 /* (wired high speed only) */
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#define USB_DEVICE_BATTERY 2 /* (wireless) */
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#define USB_DEVICE_B_HNP_ENABLE 3 /* (otg) dev may initiate HNP */
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#define USB_DEVICE_WUSB_DEVICE 3 /* (wireless)*/
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#define USB_DEVICE_A_HNP_SUPPORT 4 /* (otg) RH port supports HNP */
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#define USB_DEVICE_A_ALT_HNP_SUPPORT 5 /* (otg) other RH port does */
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#define USB_DEVICE_DEBUG_MODE 6 /* (special devices only) */
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#define USB_ENDPOINT_HALT 0 /* IN/OUT will STALL */
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/**
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* struct usb_ctrlrequest - SETUP data for a USB device control request
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* @bRequestType: matches the USB bmRequestType field
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* @bRequest: matches the USB bRequest field
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* @wValue: matches the USB wValue field (le16 byte order)
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* @wIndex: matches the USB wIndex field (le16 byte order)
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* @wLength: matches the USB wLength field (le16 byte order)
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*
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* This structure is used to send control requests to a USB device. It matches
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* the different fields of the USB 2.0 Spec section 9.3, table 9-2. See the
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* USB spec for a fuller description of the different fields, and what they are
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* used for.
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*
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* Note that the driver for any interface can issue control requests.
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* For most devices, interfaces don't coordinate with each other, so
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* such requests may be made at any time.
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*/
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struct usb_ctrlrequest {
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__u8 bRequestType;
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__u8 bRequest;
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__le16 wValue;
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__le16 wIndex;
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__le16 wLength;
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} __attribute__ ((packed));
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/*-------------------------------------------------------------------------*/
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/*
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* STANDARD DESCRIPTORS ... as returned by GET_DESCRIPTOR, or
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* (rarely) accepted by SET_DESCRIPTOR.
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*
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* Note that all multi-byte values here are encoded in little endian
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* byte order "on the wire". But when exposed through Linux-USB APIs,
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* they've been converted to cpu byte order.
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*/
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/*
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* Descriptor types ... USB 2.0 spec table 9.5
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*/
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#define USB_DT_DEVICE 0x01
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#define USB_DT_CONFIG 0x02
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#define USB_DT_STRING 0x03
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#define USB_DT_INTERFACE 0x04
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#define USB_DT_ENDPOINT 0x05
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#define USB_DT_DEVICE_QUALIFIER 0x06
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#define USB_DT_OTHER_SPEED_CONFIG 0x07
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#define USB_DT_INTERFACE_POWER 0x08
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/* these are from a minor usb 2.0 revision (ECN) */
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#define USB_DT_OTG 0x09
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#define USB_DT_DEBUG 0x0a
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#define USB_DT_INTERFACE_ASSOCIATION 0x0b
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/* these are from the Wireless USB spec */
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#define USB_DT_SECURITY 0x0c
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#define USB_DT_KEY 0x0d
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#define USB_DT_ENCRYPTION_TYPE 0x0e
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#define USB_DT_BOS 0x0f
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#define USB_DT_DEVICE_CAPABILITY 0x10
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#define USB_DT_WIRELESS_ENDPOINT_COMP 0x11
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#define USB_DT_WIRE_ADAPTER 0x21
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#define USB_DT_RPIPE 0x22
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/* conventional codes for class-specific descriptors */
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#define USB_DT_CS_DEVICE 0x21
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#define USB_DT_CS_CONFIG 0x22
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#define USB_DT_CS_STRING 0x23
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#define USB_DT_CS_INTERFACE 0x24
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#define USB_DT_CS_ENDPOINT 0x25
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/* All standard descriptors have these 2 fields at the beginning */
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struct usb_descriptor_header {
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__u8 bLength;
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__u8 bDescriptorType;
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} __attribute__ ((packed));
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/*-------------------------------------------------------------------------*/
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/* USB_DT_DEVICE: Device descriptor */
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struct usb_device_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__le16 bcdUSB;
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__u8 bDeviceClass;
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__u8 bDeviceSubClass;
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__u8 bDeviceProtocol;
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__u8 bMaxPacketSize0;
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__le16 idVendor;
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__le16 idProduct;
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__le16 bcdDevice;
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__u8 iManufacturer;
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__u8 iProduct;
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__u8 iSerialNumber;
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__u8 bNumConfigurations;
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} __attribute__ ((packed));
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#define USB_DT_DEVICE_SIZE 18
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/*
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* Device and/or Interface Class codes
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* as found in bDeviceClass or bInterfaceClass
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* and defined by www.usb.org documents
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*/
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#define USB_CLASS_PER_INTERFACE 0 /* for DeviceClass */
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#define USB_CLASS_AUDIO 1
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#define USB_CLASS_COMM 2
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#define USB_CLASS_HID 3
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#define USB_CLASS_PHYSICAL 5
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#define USB_CLASS_STILL_IMAGE 6
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#define USB_CLASS_PRINTER 7
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#define USB_CLASS_MASS_STORAGE 8
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#define USB_CLASS_HUB 9
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#define USB_CLASS_CDC_DATA 0x0a
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#define USB_CLASS_CSCID 0x0b /* chip+ smart card */
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#define USB_CLASS_CONTENT_SEC 0x0d /* content security */
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#define USB_CLASS_VIDEO 0x0e
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#define USB_CLASS_WIRELESS_CONTROLLER 0xe0
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#define USB_CLASS_MISC 0xef
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#define USB_CLASS_APP_SPEC 0xfe
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#define USB_CLASS_VENDOR_SPEC 0xff
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/*-------------------------------------------------------------------------*/
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/* USB_DT_CONFIG: Configuration descriptor information.
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*
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* USB_DT_OTHER_SPEED_CONFIG is the same descriptor, except that the
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* descriptor type is different. Highspeed-capable devices can look
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* different depending on what speed they're currently running. Only
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* devices with a USB_DT_DEVICE_QUALIFIER have any OTHER_SPEED_CONFIG
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* descriptors.
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*/
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struct usb_config_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__le16 wTotalLength;
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__u8 bNumInterfaces;
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__u8 bConfigurationValue;
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__u8 iConfiguration;
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__u8 bmAttributes;
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__u8 bMaxPower;
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} __attribute__ ((packed));
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#define USB_DT_CONFIG_SIZE 9
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/* from config descriptor bmAttributes */
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#define USB_CONFIG_ATT_ONE (1 << 7) /* must be set */
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#define USB_CONFIG_ATT_SELFPOWER (1 << 6) /* self powered */
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#define USB_CONFIG_ATT_WAKEUP (1 << 5) /* can wakeup */
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#define USB_CONFIG_ATT_BATTERY (1 << 4) /* battery powered */
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/*-------------------------------------------------------------------------*/
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/* USB_DT_STRING: String descriptor */
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struct usb_string_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__le16 wData[1]; /* UTF-16LE encoded */
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} __attribute__ ((packed));
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/* note that "string" zero is special, it holds language codes that
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* the device supports, not Unicode characters.
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*/
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/*-------------------------------------------------------------------------*/
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/* USB_DT_INTERFACE: Interface descriptor */
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struct usb_interface_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__u8 bInterfaceNumber;
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__u8 bAlternateSetting;
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__u8 bNumEndpoints;
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__u8 bInterfaceClass;
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__u8 bInterfaceSubClass;
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__u8 bInterfaceProtocol;
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__u8 iInterface;
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} __attribute__ ((packed));
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#define USB_DT_INTERFACE_SIZE 9
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/*-------------------------------------------------------------------------*/
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/* USB_DT_ENDPOINT: Endpoint descriptor */
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struct usb_endpoint_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__u8 bEndpointAddress;
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__u8 bmAttributes;
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__le16 wMaxPacketSize;
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__u8 bInterval;
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/* NOTE: these two are _only_ in audio endpoints. */
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/* use USB_DT_ENDPOINT*_SIZE in bLength, not sizeof. */
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__u8 bRefresh;
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__u8 bSynchAddress;
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} __attribute__ ((packed));
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#define USB_DT_ENDPOINT_SIZE 7
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#define USB_DT_ENDPOINT_AUDIO_SIZE 9 /* Audio extension */
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/*
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* Endpoints
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*/
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#define USB_ENDPOINT_NUMBER_MASK 0x0f /* in bEndpointAddress */
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#define USB_ENDPOINT_DIR_MASK 0x80
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#define USB_ENDPOINT_XFERTYPE_MASK 0x03 /* in bmAttributes */
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#define USB_ENDPOINT_XFER_CONTROL 0
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#define USB_ENDPOINT_XFER_ISOC 1
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#define USB_ENDPOINT_XFER_BULK 2
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#define USB_ENDPOINT_XFER_INT 3
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#define USB_ENDPOINT_MAX_ADJUSTABLE 0x80
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/*-------------------------------------------------------------------------*/
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/* USB_DT_DEVICE_QUALIFIER: Device Qualifier descriptor */
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struct usb_qualifier_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__le16 bcdUSB;
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__u8 bDeviceClass;
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__u8 bDeviceSubClass;
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__u8 bDeviceProtocol;
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__u8 bMaxPacketSize0;
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__u8 bNumConfigurations;
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__u8 bRESERVED;
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} __attribute__ ((packed));
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/*-------------------------------------------------------------------------*/
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/* USB_DT_OTG (from OTG 1.0a supplement) */
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struct usb_otg_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__u8 bmAttributes; /* support for HNP, SRP, etc */
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} __attribute__ ((packed));
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/* from usb_otg_descriptor.bmAttributes */
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#define USB_OTG_SRP (1 << 0)
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#define USB_OTG_HNP (1 << 1) /* swap host/device roles */
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/*-------------------------------------------------------------------------*/
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/* USB_DT_DEBUG: for special highspeed devices, replacing serial console */
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struct usb_debug_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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/* bulk endpoints with 8 byte maxpacket */
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__u8 bDebugInEndpoint;
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__u8 bDebugOutEndpoint;
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} __attribute__((packed));
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/*-------------------------------------------------------------------------*/
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/* USB_DT_INTERFACE_ASSOCIATION: groups interfaces */
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struct usb_interface_assoc_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__u8 bFirstInterface;
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__u8 bInterfaceCount;
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__u8 bFunctionClass;
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__u8 bFunctionSubClass;
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__u8 bFunctionProtocol;
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__u8 iFunction;
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} __attribute__ ((packed));
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/*-------------------------------------------------------------------------*/
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/* USB_DT_SECURITY: group of wireless security descriptors, including
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* encryption types available for setting up a CC/association.
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*/
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struct usb_security_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__le16 wTotalLength;
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__u8 bNumEncryptionTypes;
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} __attribute__((packed));
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/*-------------------------------------------------------------------------*/
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/* USB_DT_KEY: used with {GET,SET}_SECURITY_DATA; only public keys
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* may be retrieved.
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*/
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struct usb_key_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__u8 tTKID[3];
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__u8 bReserved;
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__u8 bKeyData[0];
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} __attribute__((packed));
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/*-------------------------------------------------------------------------*/
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/* USB_DT_ENCRYPTION_TYPE: bundled in DT_SECURITY groups */
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struct usb_encryption_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__u8 bEncryptionType;
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#define USB_ENC_TYPE_UNSECURE 0
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#define USB_ENC_TYPE_WIRED 1 /* non-wireless mode */
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#define USB_ENC_TYPE_CCM_1 2 /* aes128/cbc session */
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#define USB_ENC_TYPE_RSA_1 3 /* rsa3072/sha1 auth */
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__u8 bEncryptionValue; /* use in SET_ENCRYPTION */
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__u8 bAuthKeyIndex;
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} __attribute__((packed));
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/*-------------------------------------------------------------------------*/
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/* USB_DT_BOS: group of wireless capabilities */
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struct usb_bos_descriptor {
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__u8 bLength;
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__u8 bDescriptorType;
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__le16 wTotalLength;
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__u8 bNumDeviceCaps;
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} __attribute__((packed));
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/*-------------------------------------------------------------------------*/
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/* USB_DT_DEVICE_CAPABILITY: grouped with BOS */
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struct usb_dev_cap_header {
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__u8 bLength;
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__u8 bDescriptorType;
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__u8 bDevCapabilityType;
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} __attribute__((packed));
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#define USB_CAP_TYPE_WIRELESS_USB 1
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struct usb_wireless_cap_descriptor { /* Ultra Wide Band */
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__u8 bLength;
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__u8 bDescriptorType;
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__u8 bDevCapabilityType;
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__u8 bmAttributes;
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#define USB_WIRELESS_P2P_DRD (1 << 1)
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#define USB_WIRELESS_BEACON_MASK (3 << 2)
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#define USB_WIRELESS_BEACON_SELF (1 << 2)
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#define USB_WIRELESS_BEACON_DIRECTED (2 << 2)
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#define USB_WIRELESS_BEACON_NONE (3 << 2)
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__le16 wPHYRates; /* bit rates, Mbps */
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#define USB_WIRELESS_PHY_53 (1 << 0) /* always set */
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#define USB_WIRELESS_PHY_80 (1 << 1)
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#define USB_WIRELESS_PHY_107 (1 << 2) /* always set */
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#define USB_WIRELESS_PHY_160 (1 << 3)
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#define USB_WIRELESS_PHY_200 (1 << 4) /* always set */
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#define USB_WIRELESS_PHY_320 (1 << 5)
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#define USB_WIRELESS_PHY_400 (1 << 6)
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#define USB_WIRELESS_PHY_480 (1 << 7)
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__u8 bmTFITXPowerInfo; /* TFI power levels */
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__u8 bmFFITXPowerInfo; /* FFI power levels */
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__le16 bmBandGroup;
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|
__u8 bReserved;
|
|
} __attribute__((packed));
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* USB_DT_WIRELESS_ENDPOINT_COMP: companion descriptor associated with
|
|
* each endpoint descriptor for a wireless device
|
|
*/
|
|
struct usb_wireless_ep_comp_descriptor {
|
|
__u8 bLength;
|
|
__u8 bDescriptorType;
|
|
|
|
__u8 bMaxBurst;
|
|
__u8 bMaxSequence;
|
|
__le16 wMaxStreamDelay;
|
|
__le16 wOverTheAirPacketSize;
|
|
__u8 bOverTheAirInterval;
|
|
__u8 bmCompAttributes;
|
|
#define USB_ENDPOINT_SWITCH_MASK 0x03 /* in bmCompAttributes */
|
|
#define USB_ENDPOINT_SWITCH_NO 0
|
|
#define USB_ENDPOINT_SWITCH_SWITCH 1
|
|
#define USB_ENDPOINT_SWITCH_SCALE 2
|
|
} __attribute__((packed));
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* USB_REQ_SET_HANDSHAKE is a four-way handshake used between a wireless
|
|
* host and a device for connection set up, mutual authentication, and
|
|
* exchanging short lived session keys. The handshake depends on a CC.
|
|
*/
|
|
struct usb_handshake {
|
|
__u8 bMessageNumber;
|
|
__u8 bStatus;
|
|
__u8 tTKID[3];
|
|
__u8 bReserved;
|
|
__u8 CDID[16];
|
|
__u8 nonce[16];
|
|
__u8 MIC[8];
|
|
} __attribute__((packed));
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* USB_REQ_SET_CONNECTION modifies or revokes a connection context (CC).
|
|
* A CC may also be set up using non-wireless secure channels (including
|
|
* wired USB!), and some devices may support CCs with multiple hosts.
|
|
*/
|
|
struct usb_connection_context {
|
|
__u8 CHID[16]; /* persistent host id */
|
|
__u8 CDID[16]; /* device id (unique w/in host context) */
|
|
__u8 CK[16]; /* connection key */
|
|
} __attribute__((packed));
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* USB 2.0 defines three speeds, here's how Linux identifies them */
|
|
|
|
enum usb_device_speed {
|
|
USB_SPEED_UNKNOWN = 0, /* enumerating */
|
|
USB_SPEED_LOW, USB_SPEED_FULL, /* usb 1.1 */
|
|
USB_SPEED_HIGH, /* usb 2.0 */
|
|
USB_SPEED_VARIABLE, /* wireless (usb 2.5) */
|
|
};
|
|
|
|
enum usb_device_state {
|
|
/* NOTATTACHED isn't in the USB spec, and this state acts
|
|
* the same as ATTACHED ... but it's clearer this way.
|
|
*/
|
|
USB_STATE_NOTATTACHED = 0,
|
|
|
|
/* chapter 9 and authentication (wireless) device states */
|
|
USB_STATE_ATTACHED,
|
|
USB_STATE_POWERED, /* wired */
|
|
USB_STATE_UNAUTHENTICATED, /* auth */
|
|
USB_STATE_RECONNECTING, /* auth */
|
|
USB_STATE_DEFAULT, /* limited function */
|
|
USB_STATE_ADDRESS,
|
|
USB_STATE_CONFIGURED, /* most functions */
|
|
|
|
USB_STATE_SUSPENDED
|
|
|
|
/* NOTE: there are actually four different SUSPENDED
|
|
* states, returning to POWERED, DEFAULT, ADDRESS, or
|
|
* CONFIGURED respectively when SOF tokens flow again.
|
|
*/
|
|
};
|
|
|
|
#endif /* __LINUX_USB_CH9_H */
|