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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* @file smbus.h
* @brief smbus interface APIs
* @see http://smbus.org/specs/smbus20.pdf
*/
#ifndef __CROS_EC_SMBUS_H
#define __CROS_EC_SMBUS_H
/** Maximum transfer of a SMBUS block transfer */
#define SMBUS_MAX_BLOCK_SIZE 32
/**
* smbus write word
* write 2 byte data + 1 byte pec
*/
struct smbus_wr_word {
uint8_t slave_addr;/**< i2c_addr << 1 */
uint8_t smbus_cmd; /**< smbus cmd */
uint8_t data[3]; /**< smbus data */
} __packed;
/**
* smbus write block data
* smbus write 1 byte size + 32 byte data + 1 byte pec
*/
struct smbus_wr_block {
uint8_t slave_addr;/**< i2c_addr << 1 */
uint8_t smbus_cmd; /**< smbus cmd */
uint8_t size; /**< write size */
uint8_t data[SMBUS_MAX_BLOCK_SIZE+1];
} __packed;
/**
* smbus read word
* smbus read 2 byte + 1 pec
*/
struct smbus_rd_word {
uint8_t slave_addr; /**< i2c_addr << 1 */
uint8_t smbus_cmd; /**< smbus cmd */
uint8_t slave_addr_rd;/**< (i2c_addr << 1) | 0x1 */
uint8_t data[3]; /**< smbus data */
} __packed;
/**
* smbus read block data
* smbus read 1 byte size + 32 byte data + 1 byte pec
*/
struct smbus_rd_block {
uint8_t slave_addr; /**< i2c_addr << 1 */
uint8_t smbus_cmd; /**< smbus cmd */
uint8_t slave_addr_rd;/**< (i2c_addr << 1) | 0x1 */
uint8_t size; /**< read block size */
uint8_t data[SMBUS_MAX_BLOCK_SIZE+1]; /**< smbus data */
} __packed;
/**
* smbus_write_word
* smbus write 2 bytes
* @param i2c_port uint8_t, i2c port address
* @param slave_addr uint8_t, i2c slave address:= (i2c_addr << 1)
* @param smbus_cmd uint8_t, smbus command
* @param d16 uint16_t, 2-bytes data
* @return error_code
* EC_SUCCESS if success; none-zero if fail
* EC_ERROR_BUSY if interface is bussy
* none zero error code if fail
*/
int smbus_write_word(uint8_t i2c_port, uint8_t slave_addr,
uint8_t smbus_cmd, uint16_t d16);
/**
* smbus_write_block
* smbus write upto 32 bytes
* case 1: n-1 byte data, 1 byte PEC
* [S][i2c Address][Wr=0][A][cmd][A] ...[Di][Ai]... [PEC][A][P]
*
* case 2: 1 byte data-size, n -2 byte data, 1 byte PEC
* [S][i2c Address][Wr=0][A][cmd][A][size][A] ...[Di][Ai]... [PEC][A][P]
*
* @param i2c_port uint8_t, i2c port address
* @param slave_addr uint8_t, i2c slave address:= (i2c_addr << 1)
* @param smbus_cmd uint8_t, smbus command
* @param data uint8_t *, n-bytes data
* @param len uint8_t, data length
* @return error_code
* EC_SUCCESS if success; none-zero if fail
* EC_ERROR_BUSY if interface is bussy
* none zero error code if fail
*/
int smbus_write_block(uint8_t i2c_port, uint8_t slave_addr,
uint8_t smbus_cmd, uint8_t *data, uint8_t len);
/**
* smbus_read_word
* smbus read 2 bytes
* @param i2c_port uint8_t, i2c port address
* @param slave_addr uint8_t, i2c slave address:= (i2c_addr << 1)
* @param smbus_cmd uint8_t, smbus command
* @param p16 uint16_t *, a pointer to 2-bytes data
* @return error_code
* EC_SUCCESS if success; none-zero if fail
* EC_ERROR_BUSY if interface is bussy
* none zero error code if fail
*/
int smbus_read_word(uint8_t i2c_port, uint8_t slave_addr,
uint8_t smbus_cmd, uint16_t *p16);
/**
* smbus_read_block
* smbus read upto 32 bytes
* case 1: n-1 byte data, 1 byte PEC
* [S][i2c addr][Wr=0][A][cmd][A]
* [S][i2c addr][Rd=1][A]...[Di][Ai]...[PEC][A][P]
*
* case 2: 1 byte data-size, n - 2 byte data, 1 byte PEC
* [S][i2c addr][Wr=0][A][cmd][A]
* [S][i2c addr][Rd=1][A][size][A]...[Di][Ai]...[PEC][A][P]
*
* @param i2c_port uint8_t, i2c port address
* @param slave_addr uint8_t, i2c slave address:= (i2c_addr << 1)
* @param smbus_cmd uint8_t, smbus command
* @param data uint8_t *, n-bytes data
* @param plen uint8_t *, a pointer data length
* @return error_code
* EC_SUCCESS if success; none-zero if fail
* EC_ERROR_BUSY if interface is busy
* none zero error code if fail
*/
int smbus_read_block(uint8_t i2c_port, uint8_t slave_addr,
uint8_t smbus_cmd, uint8_t *data, uint8_t *plen);
/**
* smbus_read_string
* smbus read ascii string (upto 32-byte data + 1-byte NULL)
* Read bytestream from <slaveaddr>:<smbus_cmd> with format:
* [length_N] [byte_0] [byte_1] ... [byte_N-1][byte_N='\0']
*
* <len> : the max length of receiving buffer. to read N bytes
* ascii, len should be at least N+1 to include the
* terminating 0 (NULL).
*
* @param i2c_port uint8_t, i2c port address
* @param slave_addr uint8_t, i2c slave address:= (i2c_addr << 1)
* @param smbus_cmd uint8_t, smbus command
* @param data uint8_t *, n-bytes data
* @param len uint8_t, data length
* @return error_code
* EC_SUCCESS if success; none-zero if fail
* EC_ERROR_BUSY if interface is bussy
* none zero error code if fail
*/
int smbus_read_string(int i2c_port, uint8_t slave_addr, uint8_t smbus_cmd,
uint8_t *data, uint8_t len);
#endif /* __CROS_EC_SMBUS_H */
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