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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
1.1.1.3 ! root 40: printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->i2c.address, read);
1.1 root 41: #endif
42: }
43:
44: static void eeprom_send_byte(SMBusDevice *dev, uint8_t val)
45: {
46: SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
47: #ifdef DEBUG
1.1.1.3 ! root 48: printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n",
! 49: dev->i2c.address, val);
1.1 root 50: #endif
51: eeprom->offset = val;
52: }
53:
54: static uint8_t eeprom_receive_byte(SMBusDevice *dev)
55: {
56: SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
57: uint8_t val = eeprom->data[eeprom->offset++];
58: #ifdef DEBUG
1.1.1.3 ! root 59: printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n",
! 60: dev->i2c.address, val);
1.1 root 61: #endif
62: return val;
63: }
64:
1.1.1.2 root 65: static void eeprom_write_data(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len)
1.1 root 66: {
67: SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
1.1.1.2 root 68: int n;
1.1 root 69: #ifdef DEBUG
1.1.1.3 ! root 70: printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n",
! 71: dev->i2c.address, cmd, buf[0]);
1.1 root 72: #endif
1.1.1.2 root 73: /* An page write operation is not a valid SMBus command.
74: It is a block write without a length byte. Fortunately we
75: get the full block anyway. */
76: /* TODO: Should this set the current location? */
77: if (cmd + len > 256)
78: n = 256 - cmd;
79: else
80: n = len;
81: memcpy(eeprom->data + cmd, buf, n);
82: len -= n;
83: if (len)
84: memcpy(eeprom->data, buf + n, len);
1.1 root 85: }
86:
1.1.1.2 root 87: static uint8_t eeprom_read_data(SMBusDevice *dev, uint8_t cmd, int n)
1.1 root 88: {
89: SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev;
1.1.1.2 root 90: /* If this is the first byte then set the current position. */
91: if (n == 0)
92: eeprom->offset = cmd;
93: /* As with writes, we implement block reads without the
94: SMBus length byte. */
95: return eeprom_receive_byte(dev);
1.1 root 96: }
97:
1.1.1.2 root 98: void smbus_eeprom_device_init(i2c_bus *bus, uint8_t addr, uint8_t *buf)
1.1 root 99: {
1.1.1.2 root 100: SMBusEEPROMDevice *eeprom;
101:
102: eeprom = (SMBusEEPROMDevice *)smbus_device_init(bus, addr,
103: sizeof(SMBusEEPROMDevice));
104:
1.1 root 105: eeprom->dev.quick_cmd = eeprom_quick_cmd;
106: eeprom->dev.send_byte = eeprom_send_byte;
107: eeprom->dev.receive_byte = eeprom_receive_byte;
1.1.1.2 root 108: eeprom->dev.write_data = eeprom_write_data;
109: eeprom->dev.read_data = eeprom_read_data;
1.1 root 110: eeprom->data = buf;
111: eeprom->offset = 0;
112: }
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