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root / hw / smbus_eeprom.c @ 5fafdf24

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/*
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 * QEMU SMBus EEPROM device
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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 "vl.h"
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//#define DEBUG
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typedef struct SMBusEEPROMDevice {
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    SMBusDevice dev;
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    uint8_t *data;
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    uint8_t offset;
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} SMBusEEPROMDevice;
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static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read)
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{
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#ifdef DEBUG
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    printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->addr, read);
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#endif
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}
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static void eeprom_send_byte(SMBusDevice *dev, uint8_t val)
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{
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    SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
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#ifdef DEBUG
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    printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
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#endif
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    eeprom->offset = val;
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}
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static uint8_t eeprom_receive_byte(SMBusDevice *dev)
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{
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    SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
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    uint8_t val = eeprom->data[eeprom->offset++];
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#ifdef DEBUG
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    printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
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#endif
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    return val;
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}
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static void eeprom_write_data(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len)
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{
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    SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
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    int n;
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#ifdef DEBUG
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    printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", dev->addr,
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           cmd, buf[0]);
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#endif
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    /* An page write operation is not a valid SMBus command.
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       It is a block write without a length byte.  Fortunately we
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       get the full block anyway.  */
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    /* TODO: Should this set the current location?  */
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    if (cmd + len > 256)
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        n = 256 - cmd;
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    else
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        n = len;
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    memcpy(eeprom->data + cmd, buf, n);
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    len -= n;
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    if (len)
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        memcpy(eeprom->data, buf + n, len);
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}
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static uint8_t eeprom_read_data(SMBusDevice *dev, uint8_t cmd, int n)
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{
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    SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
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    /* If this is the first byte then set the current position.  */
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    if (n == 0)
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        eeprom->offset = cmd;
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    /* As with writes, we implement block reads without the
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       SMBus length byte.  */
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    return eeprom_receive_byte(dev);
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}
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void smbus_eeprom_device_init(i2c_bus *bus, uint8_t addr, uint8_t *buf)
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{
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    SMBusEEPROMDevice *eeprom;
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    eeprom = (SMBusEEPROMDevice *)smbus_device_init(bus, addr,
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        sizeof(SMBusEEPROMDevice));
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    eeprom->dev.quick_cmd = eeprom_quick_cmd;
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    eeprom->dev.send_byte = eeprom_send_byte;
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    eeprom->dev.receive_byte = eeprom_receive_byte;
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    eeprom->dev.write_data = eeprom_write_data;
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    eeprom->dev.read_data = eeprom_read_data;
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    eeprom->data = buf;
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    eeprom->offset = 0;
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}