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1.1 root 1: /*
2: * QEMU SMBus EEPROM device
1.1.1.2 ! root 3: *
1.1 root 4: * Copyright (c) 2007 Arastra, Inc.
1.1.1.2 ! root 5: *
1.1 root 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:
1.1.1.2 ! root 25: #include "hw.h"
! 26: #include "i2c.h"
! 27: #include "smbus.h"
1.1 root 28:
29: //#define DEBUG
30:
31: typedef struct SMBusEEPROMDevice {
32: SMBusDevice dev;
33: uint8_t *data;
34: uint8_t offset;
35: } SMBusEEPROMDevice;
36:
37: static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read)
38: {
39: #ifdef DEBUG
40: printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->addr, read);
41: #endif
42: }
43:
44: static void eeprom_send_byte(SMBusDevice *dev, uint8_t val)
45: {
46: SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
47: #ifdef DEBUG
48: printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
49: #endif
50: eeprom->offset = val;
51: }
52:
53: static uint8_t eeprom_receive_byte(SMBusDevice *dev)
54: {
55: SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
56: uint8_t val = eeprom->data[eeprom->offset++];
57: #ifdef DEBUG
58: printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
59: #endif
60: return val;
61: }
62:
1.1.1.2 ! root 63: static void eeprom_write_data(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len)
1.1 root 64: {
65: SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
1.1.1.2 ! root 66: int n;
1.1 root 67: #ifdef DEBUG
68: printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", dev->addr,
1.1.1.2 ! root 69: cmd, buf[0]);
1.1 root 70: #endif
1.1.1.2 ! root 71: /* An page write operation is not a valid SMBus command.
! 72: It is a block write without a length byte. Fortunately we
! 73: get the full block anyway. */
! 74: /* TODO: Should this set the current location? */
! 75: if (cmd + len > 256)
! 76: n = 256 - cmd;
! 77: else
! 78: n = len;
! 79: memcpy(eeprom->data + cmd, buf, n);
! 80: len -= n;
! 81: if (len)
! 82: memcpy(eeprom->data, buf + n, len);
1.1 root 83: }
84:
1.1.1.2 ! root 85: static uint8_t eeprom_read_data(SMBusDevice *dev, uint8_t cmd, int n)
1.1 root 86: {
87: SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
1.1.1.2 ! root 88: /* If this is the first byte then set the current position. */
! 89: if (n == 0)
! 90: eeprom->offset = cmd;
! 91: /* As with writes, we implement block reads without the
! 92: SMBus length byte. */
! 93: return eeprom_receive_byte(dev);
1.1 root 94: }
95:
1.1.1.2 ! root 96: void smbus_eeprom_device_init(i2c_bus *bus, uint8_t addr, uint8_t *buf)
1.1 root 97: {
1.1.1.2 ! root 98: SMBusEEPROMDevice *eeprom;
! 99:
! 100: eeprom = (SMBusEEPROMDevice *)smbus_device_init(bus, addr,
! 101: sizeof(SMBusEEPROMDevice));
! 102:
1.1 root 103: eeprom->dev.quick_cmd = eeprom_quick_cmd;
104: eeprom->dev.send_byte = eeprom_send_byte;
105: eeprom->dev.receive_byte = eeprom_receive_byte;
1.1.1.2 ! root 106: eeprom->dev.write_data = eeprom_write_data;
! 107: eeprom->dev.read_data = eeprom_read_data;
1.1 root 108: eeprom->data = buf;
109: eeprom->offset = 0;
110: }
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