101 lines
3.7 KiB
C
101 lines
3.7 KiB
C
/*
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* QEMU SMBus device (slave) 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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#ifndef HW_SMBUS_SLAVE_H
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#define HW_SMBUS_SLAVE_H
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#include "hw/i2c/i2c.h"
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#define TYPE_SMBUS_DEVICE "smbus-device"
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#define SMBUS_DEVICE(obj) \
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OBJECT_CHECK(SMBusDevice, (obj), TYPE_SMBUS_DEVICE)
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#define SMBUS_DEVICE_CLASS(klass) \
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OBJECT_CLASS_CHECK(SMBusDeviceClass, (klass), TYPE_SMBUS_DEVICE)
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#define SMBUS_DEVICE_GET_CLASS(obj) \
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OBJECT_GET_CLASS(SMBusDeviceClass, (obj), TYPE_SMBUS_DEVICE)
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typedef struct SMBusDevice SMBusDevice;
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typedef struct SMBusDeviceClass
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{
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I2CSlaveClass parent_class;
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/*
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* An operation with no data, special in SMBus.
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* This may be NULL, quick commands are ignore in that case.
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*/
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void (*quick_cmd)(SMBusDevice *dev, uint8_t read);
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/*
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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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* This may be NULL if no data is written to the device. Writes
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* will be ignore in that case.
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*/
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int (*write_data)(SMBusDevice *dev, uint8_t *buf, uint8_t len);
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/*
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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. This call cannot fail, it should return
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* something, preferably 0xff if nothing is available.
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* This may be NULL if no data is read from the device. Reads will
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* return 0xff in that case.
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*/
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uint8_t (*receive_byte)(SMBusDevice *dev);
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} SMBusDeviceClass;
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#define SMBUS_DATA_MAX_LEN 34 /* command + len + 32 bytes of data. */
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struct SMBusDevice {
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/* The SMBus protocol is implemented on top of I2C. */
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I2CSlave i2c;
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/* Remaining fields for internal use only. */
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int32_t mode;
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int32_t data_len;
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uint8_t data_buf[SMBUS_DATA_MAX_LEN];
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};
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extern const VMStateDescription vmstate_smbus_device;
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#define VMSTATE_SMBUS_DEVICE(_field, _state) { \
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.name = (stringify(_field)), \
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.size = sizeof(SMBusDevice), \
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.vmsd = &vmstate_smbus_device, \
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.flags = VMS_STRUCT, \
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.offset = vmstate_offset_value(_state, _field, SMBusDevice), \
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}
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/*
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* Users should call this in their .needed functions to know if the
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* SMBus slave data needs to be transferred.
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*/
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bool smbus_vmstate_needed(SMBusDevice *dev);
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#endif
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