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/*
* QEMU SMBus API
*
* Copyright (c) 2007 Arastra, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/

#include "i2c.h"

struct SMBusDevice {
    /* The SMBus protocol is implemented on top of I2C. */
    i2c_slave i2c;

    /* Remaining fields for internal use only. */
    int mode;
    int data_len;
    uint8_t data_buf[34]; /* command + len + 32 bytes of data. */
    uint8_t command;
};

typedef struct {
    I2CSlaveInfo i2c;
    int (*init)(SMBusDevice *dev);
    void (*quick_cmd)(SMBusDevice *dev, uint8_t read);
    void (*send_byte)(SMBusDevice *dev, uint8_t val);
    uint8_t (*receive_byte)(SMBusDevice *dev);
    /* We can't distinguish between a word write and a block write with
length 1, so pass the whole data block including the length byte
(if present). The device is responsible figuring out what type of
command this is. */
    void (*write_data)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len);
    /* Likewise we can't distinguish between different reads, or even know
the length of the read until the read is complete, so read data a
byte at a time. The device is responsible for adding the length
byte on block reads. */
    uint8_t (*read_data)(SMBusDevice *dev, uint8_t cmd, int n);
} SMBusDeviceInfo;

void smbus_register_device(SMBusDeviceInfo *info);

/* Master device commands. */
void smbus_quick_command(i2c_bus *bus, uint8_t addr, int read);
uint8_t smbus_receive_byte(i2c_bus *bus, uint8_t addr);
void smbus_send_byte(i2c_bus *bus, uint8_t addr, uint8_t data);
uint8_t smbus_read_byte(i2c_bus *bus, uint8_t addr, uint8_t command);
void smbus_write_byte(i2c_bus *bus, uint8_t addr, uint8_t command, uint8_t data);
uint16_t smbus_read_word(i2c_bus *bus, uint8_t addr, uint8_t command);
void smbus_write_word(i2c_bus *bus, uint8_t addr, uint8_t command, uint16_t data);
int smbus_read_block(i2c_bus *bus, uint8_t addr, uint8_t command, uint8_t *data);
void smbus_write_block(i2c_bus *bus, uint8_t addr, uint8_t command, uint8_t *data,
                       int len);
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