hw/smbus_eeprom.c

   1 /*
   2  * QEMU SMBus EEPROM device
   3  *
   4  * Copyright (c) 2007 Arastra, Inc.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #include "vl.h"
  26
  27 //#define DEBUG
  28
  29 typedef struct SMBusEEPROMDevice {
  30     SMBusDevice dev;
  31     uint8_t *data;
  32     uint8_t offset;
  33 } SMBusEEPROMDevice;
  34
  35 static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read)
  36 {
  37 #ifdef DEBUG
  38     printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->addr, read);
  39 #endif
  40 }
  41
  42 static void eeprom_send_byte(SMBusDevice *dev, uint8_t val)
  43 {
  44     SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
  45 #ifdef DEBUG
  46     printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
  47 #endif
  48     eeprom->offset = val;
  49 }
  50
  51 static uint8_t eeprom_receive_byte(SMBusDevice *dev)
  52 {
  53     SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
  54     uint8_t val = eeprom->data[eeprom->offset++];
  55 #ifdef DEBUG
  56     printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
  57 #endif
  58     return val;
  59 }
  60
  61 static void eeprom_write_byte(SMBusDevice *dev, uint8_t cmd, uint8_t val)
  62 {
  63     SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
  64 #ifdef DEBUG
  65     printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", dev->addr,
  66            cmd, val);
  67 #endif
  68     eeprom->data[cmd] = val;
  69 }
  70
  71 static uint8_t eeprom_read_byte(SMBusDevice *dev, uint8_t cmd)
  72 {
  73     SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
  74     uint8_t val = eeprom->data[cmd];
  75 #ifdef DEBUG
  76     printf("eeprom_read_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", dev->addr,
  77            cmd, val);
  78 #endif
  79     return val;
  80 }
  81
  82 SMBusDevice *smbus_eeprom_device_init(uint8_t addr, uint8_t *buf)
  83 {
  84     SMBusEEPROMDevice *eeprom = qemu_mallocz(sizeof(SMBusEEPROMDevice));
  85     eeprom->dev.addr = addr;
  86     eeprom->dev.quick_cmd = eeprom_quick_cmd;
  87     eeprom->dev.send_byte = eeprom_send_byte;
  88     eeprom->dev.receive_byte = eeprom_receive_byte;
  89     eeprom->dev.write_byte = eeprom_write_byte;
  90     eeprom->dev.read_byte = eeprom_read_byte;
  91     eeprom->data = buf;
  92     eeprom->offset = 0;
  93     return (SMBusDevice *) eeprom;
  94 }