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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 "hw.h"
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#include "i2c.h"
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#include "smbus.h"
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//#define DEBUG
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typedef struct SMBusEEPROMDevice {
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    SMBusDevice smbusdev;
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    void *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->i2c.address, 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",
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           dev->i2c.address, 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 *data = eeprom->data;
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    uint8_t val = data[eeprom->offset++];
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#ifdef DEBUG
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    printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n",
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           dev->i2c.address, 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",
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           dev->i2c.address, 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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static int smbus_eeprom_init(SMBusDevice *dev)
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{
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    SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *)dev;
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    eeprom->offset = 0;
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    return 0;
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}
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static SMBusDeviceInfo smbus_eeprom_info = {
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    .i2c.qdev.name = "smbus-eeprom",
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    .i2c.qdev.size = sizeof(SMBusEEPROMDevice),
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    .i2c.qdev.props = (Property[]) {
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        DEFINE_PROP_PTR("data", SMBusEEPROMDevice, data),
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        DEFINE_PROP_END_OF_LIST(),
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    },
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    .init = smbus_eeprom_init,
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    .quick_cmd = eeprom_quick_cmd,
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    .send_byte = eeprom_send_byte,
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    .receive_byte = eeprom_receive_byte,
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    .write_data = eeprom_write_data,
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    .read_data = eeprom_read_data
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};
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static void smbus_eeprom_register_devices(void)
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{
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    smbus_register_device(&smbus_eeprom_info);
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}
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device_init(smbus_eeprom_register_devices)