69 lines
3.0 KiB
C
69 lines
3.0 KiB
C
/*
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* QEMU SMBus API
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*
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* Copyright (c) 2007 Arastra, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "i2c.h"
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struct SMBusDevice {
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/* The SMBus protocol is implemented on top of I2C. */
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i2c_slave i2c;
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/* Remaining fields for internal use only. */
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int mode;
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int data_len;
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uint8_t data_buf[34]; /* command + len + 32 bytes of data. */
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uint8_t command;
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};
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typedef struct {
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I2CSlaveInfo i2c;
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void (*init)(SMBusDevice *dev);
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void (*quick_cmd)(SMBusDevice *dev, uint8_t read);
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void (*send_byte)(SMBusDevice *dev, uint8_t val);
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uint8_t (*receive_byte)(SMBusDevice *dev);
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/* We can't distinguish between a word write and a block write with
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length 1, so pass the whole data block including the length byte
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(if present). The device is responsible figuring out what type of
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command this is. */
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void (*write_data)(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len);
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/* Likewise we can't distinguish between different reads, or even know
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the length of the read until the read is complete, so read data a
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byte at a time. The device is responsible for adding the length
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byte on block reads. */
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uint8_t (*read_data)(SMBusDevice *dev, uint8_t cmd, int n);
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} SMBusDeviceInfo;
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void smbus_register_device(const char *name, int size, SMBusDeviceInfo *info);
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/* Master device commands. */
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void smbus_quick_command(i2c_bus *bus, int addr, int read);
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uint8_t smbus_receive_byte(i2c_bus *bus, int addr);
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void smbus_send_byte(i2c_bus *bus, int addr, uint8_t data);
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uint8_t smbus_read_byte(i2c_bus *bus, int addr, uint8_t command);
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void smbus_write_byte(i2c_bus *bus, int addr, uint8_t command, uint8_t data);
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uint16_t smbus_read_word(i2c_bus *bus, int addr, uint8_t command);
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void smbus_write_word(i2c_bus *bus, int addr, uint8_t command, uint16_t data);
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int smbus_read_block(i2c_bus *bus, int addr, uint8_t command, uint8_t *data);
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void smbus_write_block(i2c_bus *bus, int addr, uint8_t command, uint8_t *data,
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int len);
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