4b615be540
The I2C block transfer commands was not implemented correctly, it read a length byte and such like it was an smbus transfer. So fix the smbus_read_block() and smbus_write_block() functions so they can properly handle I2C transfers, and normal SMBus transfers (for upcoming changes). Pass in a transfer size and a bool to know whether to use the size byte (like SMBus) or use the length given (like I2C). Signed-off-by: Corey Minyard <cminyard@mvista.com> Cc: Michael S. Tsirkin <mst@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <1534796770-10295-3-git-send-email-minyard@acm.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
97 lines
4.0 KiB
C
97 lines
4.0 KiB
C
#ifndef QEMU_SMBUS_H
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#define QEMU_SMBUS_H
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/*
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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 "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 SMBusDeviceClass
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{
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I2CSlaveClass parent_class;
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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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} SMBusDeviceClass;
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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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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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/* Master device commands. */
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int smbus_quick_command(I2CBus *bus, uint8_t addr, int read);
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int smbus_receive_byte(I2CBus *bus, uint8_t addr);
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int smbus_send_byte(I2CBus *bus, uint8_t addr, uint8_t data);
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int smbus_read_byte(I2CBus *bus, uint8_t addr, uint8_t command);
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int smbus_write_byte(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t data);
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int smbus_read_word(I2CBus *bus, uint8_t addr, uint8_t command);
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int smbus_write_word(I2CBus *bus, uint8_t addr, uint8_t command, uint16_t data);
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/*
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* Do a block transfer from an I2C device. If recv_len is set, then the
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* first received byte is a length field and is used to know how much data
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* to receive. Otherwise receive "len" bytes. If send_cmd is set, send
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* the command byte first before receiving the data.
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*/
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int smbus_read_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
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int len, bool recv_len, bool send_cmd);
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/*
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* Do a block transfer to an I2C device. If send_len is set, send the
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* "len" value before the data.
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*/
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int smbus_write_block(I2CBus *bus, uint8_t addr, uint8_t command, uint8_t *data,
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int len, bool send_len);
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void smbus_eeprom_init_one(I2CBus *smbus, uint8_t address, uint8_t *eeprom_buf);
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void smbus_eeprom_init(I2CBus *smbus, int nb_eeprom,
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const uint8_t *eeprom_spd, int size);
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#endif
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