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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#ifndef EC_GOOGLE_WILCO_EC_H
#define EC_GOOGLE_WILCO_EC_H
#include <stddef.h>
#include <stdint.h>
/* Different supported message types */
enum wilco_ec_msg_type {
WILCO_EC_MSG_RAW, /* Raw message, do not skip any data */
WILCO_EC_MSG_DEFAULT, /* Skip 1 byte of response data */
WILCO_EC_MSG_NO_RESPONSE, /* EC does not respond to command */
};
/**
* wilco_ec_mailbox
*
* Send a command request to the EC mailbox and receive the response.
*
* @type: Mailbox message type, see enum above
* @command: Command to execute
* @request_data: Request data buffer
* @request_size: Number of bytes in request data buffer (max 32)
* @response_data: Response data buffer
* @response_size: Number of bytes in response data buffer (max 32)
*
* @return number of bytes received, negative error code on failure
*/
int wilco_ec_mailbox(enum wilco_ec_msg_type type, uint8_t command,
const void *request_data, size_t request_size,
void *response_data, size_t response_size);
/**
* wilco_ec_send
*
* Send a basic EC command with a one byte parameter with no
* returned data;
*
* @command: Command to execute
* @param: Command parameter to send
*
* @return negative error code on failure
*/
static inline int wilco_ec_send(uint8_t command, uint8_t param)
{
return wilco_ec_mailbox(WILCO_EC_MSG_DEFAULT, command,
¶m, sizeof(param), NULL, 0);
}
/**
* wilco_ec_send_noargs
*
* Send a basic EC command with no parameters and no returned data.
*
* @command: Command to execute
*
* @return negative error code on failure
*/
static inline int wilco_ec_send_noargs(uint8_t command)
{
return wilco_ec_mailbox(WILCO_EC_MSG_DEFAULT, command,
NULL, 0, NULL, 0);
}
/**
* wilco_ec_sendrecv
*
* Send a basic EC command with a one byte parameter, ignoring the
* first byte of returned data to match the common behavior.
* The maximum response size is 31 due to the ignored byte.
*
* @command: Command to execute
* @param: Command parameter to send
* @data: Response data buffer
* @size: Number of bytes in response data buffer (max 31)
*
* @return number of bytes received, negative error code on failure
*/
static inline int wilco_ec_sendrecv(uint8_t command, uint8_t param,
void *data, size_t size)
{
return wilco_ec_mailbox(WILCO_EC_MSG_DEFAULT, command,
¶m, sizeof(param), data, size);
}
/**
* wilco_ec_sendrecv_noargs
*
* Send a basic EC command with no parameters, ignoring the
* first byte of returned data to match the common behavior.
* The maximum response size is 31 due to the ignored byte.
*
* @command: Command to execute
* @data: Response data buffer
* @size: Number of bytes in response data buffer (max 31)
*
* @return number of bytes received, negative error code on failure
*/
static inline int wilco_ec_sendrecv_noargs(uint8_t command,
void *data, size_t size)
{
return wilco_ec_mailbox(WILCO_EC_MSG_DEFAULT, command,
NULL, 0, data, size);
}
#endif /* EC_GOOGLE_WILCO_EC_H */
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