hdr_ddr.h

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/*
 * Copyright 2024 Meta Platforms
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_DRIVERS_I3C_HDR_DDR_H_
#define ZEPHYR_INCLUDE_DRIVERS_I3C_HDR_DDR_H_
 
#include <errno.h>
#include <stddef.h>
#include <stdint.h>
 
#include <zephyr/drivers/i3c.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
static inline int i3c_hdr_ddr_write(struct i3c_device_desc *target, uint8_t cmd, uint8_t *buf,
                                    uint32_t num_bytes)
{
        struct i3c_msg msg;
 
        msg.buf = buf;
        msg.len = num_bytes;
        msg.flags = I3C_MSG_WRITE | I3C_MSG_STOP | I3C_MSG_HDR;
        msg.hdr_mode = I3C_MSG_HDR_DDR;
        msg.hdr_cmd_code = cmd;
 
        return i3c_transfer(target, &msg, 1);
}
 
static inline int i3c_hdr_ddr_read(struct i3c_device_desc *target, uint8_t cmd, uint8_t *buf,
                                   uint32_t num_bytes)
{
        struct i3c_msg msg;
 
        msg.buf = buf;
        msg.len = num_bytes;
        msg.flags = I3C_MSG_READ | I3C_MSG_STOP | I3C_MSG_HDR;
        msg.hdr_mode = I3C_MSG_HDR_DDR;
        msg.hdr_cmd_code = cmd;
 
        return i3c_transfer(target, &msg, 1);
}
 
static inline int i3c_hdr_ddr_write_read(struct i3c_device_desc *target, const void *write_buf,
                                         size_t num_write, uint8_t read_cmd, void *read_buf,
                                         size_t num_read, uint8_t write_cmd)
{
        struct i3c_msg msg[2];
 
        msg[0].buf = (uint8_t *)write_buf;
        msg[0].len = num_write;
        msg[0].flags = I3C_MSG_WRITE | I3C_MSG_HDR;
        msg[0].hdr_mode = I3C_MSG_HDR_DDR;
        msg[0].hdr_cmd_code = write_cmd;
 
        msg[1].buf = (uint8_t *)read_buf;
        msg[1].len = num_read;
        msg[1].flags = I3C_MSG_RESTART | I3C_MSG_READ | I3C_MSG_HDR | I3C_MSG_STOP;
        msg[1].hdr_mode = I3C_MSG_HDR_DDR;
        msg[1].hdr_cmd_code = read_cmd;
 
        return i3c_transfer(target, msg, 2);
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_INCLUDE_DRIVERS_I3C_HDR_DDR_H_ */