/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Surface Serial Hub (SSH) protocol and communication interface.
*
* Lower-level communication layers and SSH protocol definitions for the
* Surface System Aggregator Module (SSAM). Provides the interface for basic
* packet- and request-based communication with the SSAM EC via SSH.
*
* Copyright (C) 2019-2021 Maximilian Luz <[email protected]>
*/
#ifndef _LINUX_SURFACE_AGGREGATOR_SERIAL_HUB_H
#define _LINUX_SURFACE_AGGREGATOR_SERIAL_HUB_H
#include <linux/crc-itu-t.h>
#include <linux/kref.h>
#include <linux/ktime.h>
#include <linux/list.h>
#include <linux/types.h>
/* -- Data structures for SAM-over-SSH communication. ----------------------- */
/**
* enum ssh_frame_type - Frame types for SSH frames.
*
* @SSH_FRAME_TYPE_DATA_SEQ:
* Indicates a data frame, followed by a payload with the length specified
* in the ``struct ssh_frame.len`` field. This frame is sequenced, meaning
* that an ACK is required.
*
* @SSH_FRAME_TYPE_DATA_NSQ:
* Same as %SSH_FRAME_TYPE_DATA_SEQ, but unsequenced, meaning that the
* message does not have to be ACKed.
*
* @SSH_FRAME_TYPE_ACK:
* Indicates an ACK message.
*
* @SSH_FRAME_TYPE_NAK:
* Indicates an error response for previously sent frame. In general, this
* means that the frame and/or payload is malformed, e.g. a CRC is wrong.
* For command-type payloads, this can also mean that the command is
* invalid.
*/
enum ssh_frame_type {
SSH_FRAME_TYPE_DATA_SEQ = 0x80,
SSH_FRAME_TYPE_DATA_NSQ = 0x00,
SSH_FRAME_TYPE_ACK = 0x40,
SSH_FRAME_TYPE_NAK = 0x04,
};
/**
* struct ssh_frame - SSH communication frame.
* @type: The type of the frame. See &enum ssh_frame_type.
* @len: The length of the frame payload directly following the CRC for this
* frame. Does not include the final CRC for that payload.
* @seq: The sequence number for this message/exchange.
*/
struct ssh_frame {
u8 type;
__le16 len;
u8 seq;
} __packed;
static_assert(sizeof(struct ssh_frame) == 4);
/*
* SSH_FRAME_MAX_PAYLOAD_SIZE - Maximum SSH frame payload length in bytes.
*
* This is the physical maximum length of the protocol. Implementations may
* set a more constrained limit.
*/
#define SSH_FRAME_MAX_PAYLOAD_SIZE U16_MAX
/**
* enum ssh_payload_type - Type indicator for the SSH payload.
* @SSH_PLD_TYPE_CMD: The payload is a command structure with optional command
* payload.
*/
enum ssh_payload_type {
SSH_PLD_TYPE_CMD = 0x80,
};
/**
* struct ssh_command - Payload of a command-type frame.
* @type: The type of the payload. See &enum ssh_payload_type. Should be
* SSH_PLD_TYPE_CMD for this struct.
* @tc: Command target category.
* @tid: Target ID. Indicates the target of the message.
* @sid: Source ID. Indicates the source of the message.
* @iid: Instance ID.
* @rqid: Request ID. Used to match requests with responses and differentiate
* between responses and events.
* @cid: Command ID.
*/
struct ssh_command {
u8 type;
u8 tc;
u8 tid;
u8 sid;
u8 iid;
__le16 rqid;
u8 cid;
} __packed;
static_assert(sizeof(struct ssh_command) == 8);
/*
* SSH_COMMAND_MAX_PAYLOAD_SIZE - Maximum SSH command payload length in bytes.
*
* This is the physical maximum length of the protocol. Implementations may
* set a more constrained limit.
*/
#define SSH_COMMAND_MAX_PAYLOAD_SIZE \
(SSH_FRAME_MAX_PAYLOAD_SIZE - sizeof(struct ssh_command))
/*
* SSH_MSG_LEN_BASE - Base-length of a SSH message.
*
* This is the minimum number of bytes required to form a message. The actual
* message length is SSH_MSG_LEN_BASE plus the length of the frame payload.
*/
#define SSH_MSG_LEN_BASE (sizeof(struct ssh_frame) + 3ull * sizeof(u16))
/*
* SSH_MSG_LEN_CTRL - Length of a SSH control message.
*
* This is the length of a SSH control message, which is equal to a SSH
* message without any payload.
*/
#define SSH_MSG_LEN_CTRL SSH_MSG_LEN_BASE
/**
* SSH_MESSAGE_LENGTH() - Compute length of SSH message.
* @payload_size: Length of the payload inside the SSH frame.
*
* Return: Returns the length of a SSH message with payload of specified size.
*/
#define SSH_MESSAGE_LENGTH(payload_size) (SSH_MSG_LEN_BASE + (payload_size))
/**
* SSH_COMMAND_MESSAGE_LENGTH() - Compute length of SSH command message.
* @payload_size: Length of the command payload.
*
* Return: Returns the length of a SSH command message with command payload of
* specified size.
*/
#define SSH_COMMAND_MESSAGE_LENGTH(payload_size) \
SSH_MESSAGE_LENGTH(sizeof(struct ssh_command) + (payload_size))
/**
* SSH_MSGOFFSET_FRAME() - Compute offset in SSH message to specified field in
* frame.
* @field: The field for which the offset should be computed.
*
* Return: Returns the offset of the specified &struct ssh_frame field in the
* raw SSH message data as. Takes SYN bytes (u16) preceding the frame into
* account.
*/
#define SSH_MSGOFFSET_FRAME(field) \
(sizeof(u16) + offsetof(struct ssh_frame, field))
/**
* SSH_MSGOFFSET_COMMAND() - Compute offset in SSH message to specified field
* in command.
* @field: The field for which the offset should be computed.
*
* Return: Returns the offset of the specified &struct ssh_command field in
* the raw SSH message data. Takes SYN bytes (u16) preceding the frame and the
* frame CRC (u16) between frame and command into account.
*/
#define SSH_MSGOFFSET_COMMAND(field) \
(2ull * sizeof(u16) + sizeof(struct ssh_frame) \
+ offsetof(struct ssh_command, field))
/*
* SSH_MSG_SYN - SSH message synchronization (SYN) bytes as u16.
*/
#define SSH_MSG_SYN ((u16)0x55aa)
/**
* ssh_crc() - Compute CRC for SSH messages.
* @buf: The pointer pointing to the data for which the CRC should be computed.
* @len: The length of the data for which the CRC should be computed.
*
* Return: Returns the CRC computed on the provided data, as used for SSH
* messages.
*/
static inline u16 ssh_crc(const u8 *buf, size_t len)
{
return crc_itu_t(0xffff, buf, len);
}
/*
* SSH_NUM_EVENTS - The number of reserved event IDs.
*
* The number of reserved event IDs, used for registering an SSH event
* handler. Valid event IDs are numbers below or equal to this value, with
* exception of zero, which is not an event ID. Thus, this is also the
* absolute maximum number of event handlers that can be registered.
*/
#define SSH_NUM_EVENTS 38
/*
* SSH_NUM_TARGETS - The number of communication targets used in the protocol.
*/
#define SSH_NUM_TARGETS 2
/**
* ssh_rqid_next_valid() - Return the next valid request ID.
* @rqid: The current request ID.
*
* Return: Returns the next valid request ID, following the current request ID
* provided to this function. This function skips any request IDs reserved for
* events.
*/
static inline u16 ssh_rqid_next_valid(u16 rqid)
{
return rqid > 0 ? rqid + 1u : rqid + SSH_NUM_EVENTS + 1u;
}
/**
* ssh_rqid_to_event() - Convert request ID to its corresponding event ID.
* @rqid: The request ID to convert.
*/
static inline u16 ssh_rqid_to_event(u16 rqid)
{
return rqid - 1u;
}
/**
* ssh_rqid_is_event() - Check if given request ID is a valid event ID.
* @rqid: The request ID to check.
*/
static inline bool ssh_rqid_is_event(u16 rqid)
{
return ssh_rqid_to_event(rqid) < SSH_NUM_EVENTS;
}
/**
* ssh_tc_to_rqid() - Convert target category to its corresponding request ID.
* @tc: The target category to convert.
*/
static inline u16 ssh_tc_to_rqid(u8 tc)
{
return tc;
}
/**
* ssh_tid_to_index() - Convert target ID to its corresponding target index.
* @tid: The target ID to convert.
*/
static inline u8 ssh_tid_to_index(u8 tid)
{
return tid - 1u;
}
/**
* ssh_tid_is_valid() - Check if target ID is valid/supported.
* @tid: The target ID to check.
*/
static inline bool ssh_tid_is_valid(u8 tid)
{
return ssh_tid_to_index(tid) < SSH_NUM_TARGETS;
}
/**
* struct ssam_span - Reference to a buffer region.
* @ptr: Pointer to the buffer region.
* @len: Length of the buffer region.
*
* A reference to a (non-owned) buffer segment, consisting of pointer and
* length. Use of this struct indicates non-owned data, i.e. data of which the
* life-time is managed (i.e. it is allocated/freed) via another pointer.
*/
struct ssam_span {
u8 *ptr;
size_t len;
};
/**
* enum ssam_ssh_tid - Target/source IDs for Serial Hub messages.
* @SSAM_SSH_TID_HOST: We as the kernel Serial Hub driver.
* @SSAM_SSH_TID_SAM: The Surface Aggregator EC.
* @SSAM_SSH_TID_KIP: Keyboard and perihperal controller.
* @SSAM_SSH_TID_DEBUG: Debug connector.
* @SSAM_SSH_TID_SURFLINK: SurfLink connector.
*/
enum ssam_ssh_tid {
SSAM_SSH_TID_HOST = 0x00,
SSAM_SSH_TID_SAM = 0x01,
SSAM_SSH_TID_KIP = 0x02,
SSAM_SSH_TID_DEBUG = 0x03,
SSAM_SSH_TID_SURFLINK = 0x04,
};
/*
* Known SSH/EC target categories.
*
* List of currently known target category values; "Known" as in we know they
* exist and are valid on at least some device/model. Detailed functionality
* or the full category name is only known for some of these categories and
* is detailed in the respective comment below.
*
* These values and abbreviations have been extracted from strings inside the
* Windows driver.
*/
enum ssam_ssh_tc {
/* Category 0x00 is invalid for EC use. */
SSAM_SSH_TC_SAM = 0x01, /* Generic system functionality, real-time clock. */
SSAM_SSH_TC_BAT = 0x02, /* Battery/power subsystem. */
SSAM_SSH_TC_TMP = 0x03, /* Thermal subsystem. */
SSAM_SSH_TC_PMC = 0x04,
SSAM_SSH_TC_FAN = 0x05,
SSAM_SSH_TC_PoM = 0x06,
SSAM_SSH_TC_DBG = 0x07,
SSAM_SSH_TC_KBD = 0x08, /* Legacy keyboard (Laptop 1/2). */
SSAM_SSH_TC_FWU = 0x09,
SSAM_SSH_TC_UNI = 0x0a,
SSAM_SSH_TC_LPC = 0x0b,
SSAM_SSH_TC_TCL = 0x0c,
SSAM_SSH_TC_SFL = 0x0d,
SSAM_SSH_TC_KIP = 0x0e, /* Manages detachable peripherals (Pro X/8 keyboard cover) */
SSAM_SSH_TC_EXT = 0x0f,
SSAM_SSH_TC_BLD = 0x10,
SSAM_SSH_TC_BAS = 0x11, /* Detachment system (Surface Book 2/3). */
SSAM_SSH_TC_SEN = 0x12,
SSAM_SSH_TC_SRQ = 0x13,
SSAM_SSH_TC_MCU = 0x14,
SSAM_SSH_TC_HID = 0x15, /* Generic HID input subsystem. */
SSAM_SSH_TC_TCH = 0x16,
SSAM_SSH_TC_BKL = 0x17,
SSAM_SSH_TC_TAM = 0x18,
SSAM_SSH_TC_ACC0 = 0x19,
SSAM_SSH_TC_UFI = 0x1a,
SSAM_SSH_TC_USC = 0x1b,
SSAM_SSH_TC_PEN = 0x1c,
SSAM_SSH_TC_VID = 0x1d,
SSAM_SSH_TC_AUD = 0x1e,
SSAM_SSH_TC_SMC = 0x1f,
SSAM_SSH_TC_KPD = 0x20,
SSAM_SSH_TC_REG = 0x21, /* Extended event registry. */
SSAM_SSH_TC_SPT = 0x22,
SSAM_SSH_TC_SYS = 0x23,
SSAM_SSH_TC_ACC1 = 0x24,
SSAM_SSH_TC_SHB = 0x25,
SSAM_SSH_TC_POS = 0x26, /* For obtaining Laptop Studio screen position. */
};
/* -- Packet transport layer (ptl). ----------------------------------------- */
/**
* enum ssh_packet_base_priority - Base priorities for &struct ssh_packet.
* @SSH_PACKET_PRIORITY_FLUSH: Base priority for flush packets.
* @SSH_PACKET_PRIORITY_DATA: Base priority for normal data packets.
* @SSH_PACKET_PRIORITY_NAK: Base priority for NAK packets.
* @SSH_PACKET_PRIORITY_ACK: Base priority for ACK packets.
*/
enum ssh_packet_base_priority {
SSH_PACKET_PRIORITY_FLUSH = 0, /* same as DATA to sequence flush */
SSH_PACKET_PRIORITY_DATA = 0,
SSH_PACKET_PRIORITY_NAK = 1,
SSH_PACKET_PRIORITY_ACK = 2,
};
/*
* Same as SSH_PACKET_PRIORITY() below, only with actual values.
*/
#define __SSH_PACKET_PRIORITY(base, try) \
(((base) << 4) | ((try) & 0x0f))
/**
* SSH_PACKET_PRIORITY() - Compute packet priority from base priority and
* number of tries.
* @base: The base priority as suffix of &enum ssh_packet_base_priority, e.g.
* ``FLUSH``, ``DATA``, ``ACK``, or ``NAK``.
* @try: The number of tries (must be less than 16).
*
* Compute the combined packet priority. The combined priority is dominated by
* the base priority, whereas the number of (re-)tries decides the precedence
* of packets with the same base priority, giving higher priority to packets
* that already have more tries.
*
* Return: Returns the computed priority as value fitting inside a &u8. A
* higher number means a higher priority.
*/
#define SSH_PACKET_PRIORITY(base, try) \
__SSH_PACKET_PRIORITY(SSH_PACKET_PRIORITY_##base, (try))
/**
* ssh_packet_priority_get_try() - Get number of tries from packet priority.
* @priority: The packet priority.
*
* Return: Returns the number of tries encoded in the specified packet
* priority.
*/
static inline u8 ssh_packet_priority_get_try(u8 priority)
{
return priority & 0x0f;
}
/**
* ssh_packet_priority_get_base - Get base priority from packet priority.
* @priority: The packet priority.
*
* Return: Returns the base priority encoded in the given packet priority.
*/
static inline u8 ssh_packet_priority_get_base(u8 priority)
{
return (priority & 0xf0) >> 4;
}
enum ssh_packet_flags {
/* state flags */
SSH_PACKET_SF_LOCKED_BIT,
SSH_PACKET_SF_QUEUED_BIT,
SSH_PACKET_SF_PENDING_BIT,
SSH_PACKET_SF_TRANSMITTING_BIT,
SSH_PACKET_SF_TRANSMITTED_BIT,
SSH_PACKET_SF_ACKED_BIT,
SSH_PACKET_SF_CANCELED_BIT,
SSH_PACKET_SF_COMPLETED_BIT,
/* type flags */
SSH_PACKET_TY_FLUSH_BIT,
SSH_PACKET_TY_SEQUENCED_BIT,
SSH_PACKET_TY_BLOCKING_BIT,
/* mask for state flags */
SSH_PACKET_FLAGS_SF_MASK =
BIT(SSH_PACKET_SF_LOCKED_BIT)
| BIT(SSH_PACKET_SF_QUEUED_BIT)
| BIT(SSH_PACKET_SF_PENDING_BIT)
| BIT(SSH_PACKET_SF_TRANSMITTING_BIT)
| BIT(SSH_PACKET_SF_TRANSMITTED_BIT)
| BIT(SSH_PACKET_SF_ACKED_BIT)
| BIT(SSH_PACKET_SF_CANCELED_BIT)
| BIT(SSH_PACKET_SF_COMPLETED_BIT),
/* mask for type flags */
SSH_PACKET_FLAGS_TY_MASK =
BIT(SSH_PACKET_TY_FLUSH_BIT)
| BIT(SSH_PACKET_TY_SEQUENCED_BIT)
| BIT(SSH_PACKET_TY_BLOCKING_BIT),
};
struct ssh_ptl;
struct ssh_packet;
/**
* struct ssh_packet_ops - Callback operations for a SSH packet.
* @release: Function called when the packet reference count reaches zero.
* This callback must be relied upon to ensure that the packet has
* left the transport system(s).
* @complete: Function called when the packet is completed, either with
* success or failure. In case of failure, the reason for the
* failure is indicated by the value of the provided status code
* argument. This value will be zero in case of success. Note that
* a call to this callback does not guarantee that the packet is
* not in use by the transport system any more.
*/
struct ssh_packet_ops {
void (*release)(struct ssh_packet *p);
void (*complete)(struct ssh_packet *p, int status);
};
/**
* struct ssh_packet - SSH transport packet.
* @ptl: Pointer to the packet transport layer. May be %NULL if the packet
* (or enclosing request) has not been submitted yet.
* @refcnt: Reference count of the packet.
* @priority: Priority of the packet. Must be computed via
* SSH_PACKET_PRIORITY(). Must only be accessed while holding the
* queue lock after first submission.
* @data: Raw message data.
* @data.len: Length of the raw message data.
* @data.ptr: Pointer to the raw message data buffer.
* @state: State and type flags describing current packet state (dynamic)
* and type (static). See &enum ssh_packet_flags for possible
* options.
* @timestamp: Timestamp specifying when the latest transmission of a
* currently pending packet has been started. May be %KTIME_MAX
* before or in-between transmission attempts. Used for the packet
* timeout implementation. Must only be accessed while holding the
* pending lock after first submission.
* @queue_node: The list node for the packet queue.
* @pending_node: The list node for the set of pending packets.
* @ops: Packet operations.
*/
struct ssh_packet {
struct ssh_ptl *ptl;
struct kref refcnt;
u8 priority;
struct {
size_t len;
u8 *ptr;
} data;
unsigned long state;
ktime_t timestamp;
struct list_head queue_node;
struct list_head pending_node;
const struct ssh_packet_ops *ops;
};
struct ssh_packet *ssh_packet_get(struct ssh_packet *p);
void ssh_packet_put(struct ssh_packet *p);
/**
* ssh_packet_set_data() - Set raw message data of packet.
* @p: The packet for which the message data should be set.
* @ptr: Pointer to the memory holding the message data.
* @len: Length of the message data.
*
* Sets the raw message data buffer of the packet to the provided memory. The
* memory is not copied. Instead, the caller is responsible for management
* (i.e. allocation and deallocation) of the memory. The caller must ensure
* that the provided memory is valid and contains a valid SSH message,
* starting from the time of submission of the packet until the ``release``
* callback has been called. During this time, the memory may not be altered
* in any way.
*/
static inline void ssh_packet_set_data(struct ssh_packet *p, u8 *ptr, size_t len)
{
p->data.ptr = ptr;
p->data.len = len;
}
/* -- Request transport layer (rtl). ---------------------------------------- */
enum ssh_request_flags {
/* state flags */
SSH_REQUEST_SF_LOCKED_BIT,
SSH_REQUEST_SF_QUEUED_BIT,
SSH_REQUEST_SF_PENDING_BIT,
SSH_REQUEST_SF_TRANSMITTING_BIT,
SSH_REQUEST_SF_TRANSMITTED_BIT,
SSH_REQUEST_SF_RSPRCVD_BIT,
SSH_REQUEST_SF_CANCELED_BIT,
SSH_REQUEST_SF_COMPLETED_BIT,
/* type flags */
SSH_REQUEST_TY_FLUSH_BIT,
SSH_REQUEST_TY_HAS_RESPONSE_BIT,
/* mask for state flags */
SSH_REQUEST_FLAGS_SF_MASK =
BIT(SSH_REQUEST_SF_LOCKED_BIT)
| BIT(SSH_REQUEST_SF_QUEUED_BIT)
| BIT(SSH_REQUEST_SF_PENDING_BIT)
| BIT(SSH_REQUEST_SF_TRANSMITTING_BIT)
| BIT(SSH_REQUEST_SF_TRANSMITTED_BIT)
| BIT(SSH_REQUEST_SF_RSPRCVD_BIT)
| BIT(SSH_REQUEST_SF_CANCELED_BIT)
| BIT(SSH_REQUEST_SF_COMPLETED_BIT),
/* mask for type flags */
SSH_REQUEST_FLAGS_TY_MASK =
BIT(SSH_REQUEST_TY_FLUSH_BIT)
| BIT(SSH_REQUEST_TY_HAS_RESPONSE_BIT),
};
struct ssh_rtl;
struct ssh_request;
/**
* struct ssh_request_ops - Callback operations for a SSH request.
* @release: Function called when the request's reference count reaches zero.
* This callback must be relied upon to ensure that the request has
* left the transport systems (both, packet an request systems).
* @complete: Function called when the request is completed, either with
* success or failure. The command data for the request response
* is provided via the &struct ssh_command parameter (``cmd``),
* the command payload of the request response via the &struct
* ssh_span parameter (``data``).
*
* If the request does not have any response or has not been
* completed with success, both ``cmd`` and ``data`` parameters will
* be NULL. If the request response does not have any command
* payload, the ``data`` span will be an empty (zero-length) span.
*
* In case of failure, the reason for the failure is indicated by
* the value of the provided status code argument (``status``). This
* value will be zero in case of success and a regular errno
* otherwise.
*
* Note that a call to this callback does not guarantee that the
* request is not in use by the transport systems any more.
*/
struct ssh_request_ops {
void (*release)(struct ssh_request *rqst);
void (*complete)(struct ssh_request *rqst,
const struct ssh_command *cmd,
const struct ssam_span *data, int status);
};
/**
* struct ssh_request - SSH transport request.
* @packet: The underlying SSH transport packet.
* @node: List node for the request queue and pending set.
* @state: State and type flags describing current request state (dynamic)
* and type (static). See &enum ssh_request_flags for possible
* options.
* @timestamp: Timestamp specifying when we start waiting on the response of
* the request. This is set once the underlying packet has been
* completed and may be %KTIME_MAX before that, or when the request
* does not expect a response. Used for the request timeout
* implementation.
* @ops: Request Operations.
*/
struct ssh_request {
struct ssh_packet packet;
struct list_head node;
unsigned long state;
ktime_t timestamp;
const struct ssh_request_ops *ops;
};
/**
* to_ssh_request() - Cast a SSH packet to its enclosing SSH request.
* @p: The packet to cast.
*
* Casts the given &struct ssh_packet to its enclosing &struct ssh_request.
* The caller is responsible for making sure that the packet is actually
* wrapped in a &struct ssh_request.
*
* Return: Returns the &struct ssh_request wrapping the provided packet.
*/
static inline struct ssh_request *to_ssh_request(struct ssh_packet *p)
{
return container_of(p, struct ssh_request, packet);
}
/**
* ssh_request_get() - Increment reference count of request.
* @r: The request to increment the reference count of.
*
* Increments the reference count of the given request by incrementing the
* reference count of the underlying &struct ssh_packet, enclosed in it.
*
* See also ssh_request_put(), ssh_packet_get().
*
* Return: Returns the request provided as input.
*/
static inline struct ssh_request *ssh_request_get(struct ssh_request *r)
{
return r ? to_ssh_request(ssh_packet_get(&r->packet)) : NULL;
}
/**
* ssh_request_put() - Decrement reference count of request.
* @r: The request to decrement the reference count of.
*
* Decrements the reference count of the given request by decrementing the
* reference count of the underlying &struct ssh_packet, enclosed in it. If
* the reference count reaches zero, the ``release`` callback specified in the
* request's &struct ssh_request_ops, i.e. ``r->ops->release``, will be
* called.
*
* See also ssh_request_get(), ssh_packet_put().
*/
static inline void ssh_request_put(struct ssh_request *r)
{
if (r)
ssh_packet_put(&r->packet);
}
/**
* ssh_request_set_data() - Set raw message data of request.
* @r: The request for which the message data should be set.
* @ptr: Pointer to the memory holding the message data.
* @len: Length of the message data.
*
* Sets the raw message data buffer of the underlying packet to the specified
* buffer. Does not copy the actual message data, just sets the buffer pointer
* and length. Refer to ssh_packet_set_data() for more details.
*/
static inline void ssh_request_set_data(struct ssh_request *r, u8 *ptr, size_t len)
{
ssh_packet_set_data(&r->packet, ptr, len);
}
#endif /* _LINUX_SURFACE_AGGREGATOR_SERIAL_HUB_H */
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