Archipelago » qemu

/*

 * 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;

    void (*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, int addr, int read);

uint8_t smbus_receive_byte(i2c_bus *bus, int addr);

void smbus_send_byte(i2c_bus *bus, int addr, uint8_t data);

uint8_t smbus_read_byte(i2c_bus *bus, int addr, uint8_t command);

void smbus_write_byte(i2c_bus *bus, int addr, uint8_t command, uint8_t data);

uint16_t smbus_read_word(i2c_bus *bus, int addr, uint8_t command);

void smbus_write_word(i2c_bus *bus, int addr, uint8_t command, uint16_t data);

int smbus_read_block(i2c_bus *bus, int addr, uint8_t command, uint8_t *data);

void smbus_write_block(i2c_bus *bus, int addr, uint8_t command, uint8_t *data,

                       int len);