root / hw / smbus_eeprom.c @ c75a823c
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1 | 3fffc223 | ths | /*
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2 | 3fffc223 | ths | * QEMU SMBus EEPROM device
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3 | 5fafdf24 | ths | *
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4 | 3fffc223 | ths | * Copyright (c) 2007 Arastra, Inc.
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5 | 5fafdf24 | ths | *
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6 | 3fffc223 | ths | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 3fffc223 | ths | * of this software and associated documentation files (the "Software"), to deal
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8 | 3fffc223 | ths | * in the Software without restriction, including without limitation the rights
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9 | 3fffc223 | ths | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 3fffc223 | ths | * copies of the Software, and to permit persons to whom the Software is
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11 | 3fffc223 | ths | * furnished to do so, subject to the following conditions:
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12 | 3fffc223 | ths | *
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13 | 3fffc223 | ths | * The above copyright notice and this permission notice shall be included in
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14 | 3fffc223 | ths | * all copies or substantial portions of the Software.
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15 | 3fffc223 | ths | *
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16 | 3fffc223 | ths | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 3fffc223 | ths | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 3fffc223 | ths | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 3fffc223 | ths | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 3fffc223 | ths | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 3fffc223 | ths | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 3fffc223 | ths | * THE SOFTWARE.
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23 | 3fffc223 | ths | */
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24 | 3fffc223 | ths | |
25 | 87ecb68b | pbrook | #include "hw.h" |
26 | 87ecb68b | pbrook | #include "i2c.h" |
27 | 87ecb68b | pbrook | #include "smbus.h" |
28 | 3fffc223 | ths | |
29 | 3fffc223 | ths | //#define DEBUG
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30 | 3fffc223 | ths | |
31 | 3fffc223 | ths | typedef struct SMBusEEPROMDevice { |
32 | 3fffc223 | ths | SMBusDevice dev; |
33 | 3fffc223 | ths | uint8_t *data; |
34 | 3fffc223 | ths | uint8_t offset; |
35 | 3fffc223 | ths | } SMBusEEPROMDevice; |
36 | 3fffc223 | ths | |
37 | 3fffc223 | ths | static void eeprom_quick_cmd(SMBusDevice *dev, uint8_t read) |
38 | 3fffc223 | ths | { |
39 | 3fffc223 | ths | #ifdef DEBUG
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40 | 3fffc223 | ths | printf("eeprom_quick_cmd: addr=0x%02x read=%d\n", dev->addr, read);
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41 | 3fffc223 | ths | #endif
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42 | 3fffc223 | ths | } |
43 | 3fffc223 | ths | |
44 | 3fffc223 | ths | static void eeprom_send_byte(SMBusDevice *dev, uint8_t val) |
45 | 3fffc223 | ths | { |
46 | 3fffc223 | ths | SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; |
47 | 3fffc223 | ths | #ifdef DEBUG
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48 | 3fffc223 | ths | printf("eeprom_send_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
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49 | 3fffc223 | ths | #endif
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50 | 3fffc223 | ths | eeprom->offset = val; |
51 | 3fffc223 | ths | } |
52 | 3fffc223 | ths | |
53 | 3fffc223 | ths | static uint8_t eeprom_receive_byte(SMBusDevice *dev)
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54 | 3fffc223 | ths | { |
55 | 3fffc223 | ths | SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; |
56 | 3fffc223 | ths | uint8_t val = eeprom->data[eeprom->offset++]; |
57 | 3fffc223 | ths | #ifdef DEBUG
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58 | 3fffc223 | ths | printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n", dev->addr, val);
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59 | 3fffc223 | ths | #endif
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60 | 3fffc223 | ths | return val;
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61 | 3fffc223 | ths | } |
62 | 3fffc223 | ths | |
63 | 0ff596d0 | pbrook | static void eeprom_write_data(SMBusDevice *dev, uint8_t cmd, uint8_t *buf, int len) |
64 | 3fffc223 | ths | { |
65 | 3fffc223 | ths | SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; |
66 | 0ff596d0 | pbrook | int n;
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67 | 3fffc223 | ths | #ifdef DEBUG
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68 | 3fffc223 | ths | printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n", dev->addr,
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69 | 0ff596d0 | pbrook | cmd, buf[0]);
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70 | 3fffc223 | ths | #endif
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71 | 0ff596d0 | pbrook | /* An page write operation is not a valid SMBus command.
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72 | 0ff596d0 | pbrook | It is a block write without a length byte. Fortunately we
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73 | 0ff596d0 | pbrook | get the full block anyway. */
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74 | 0ff596d0 | pbrook | /* TODO: Should this set the current location? */
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75 | 0ff596d0 | pbrook | if (cmd + len > 256) |
76 | 0ff596d0 | pbrook | n = 256 - cmd;
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77 | 0ff596d0 | pbrook | else
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78 | 0ff596d0 | pbrook | n = len; |
79 | 0ff596d0 | pbrook | memcpy(eeprom->data + cmd, buf, n); |
80 | 0ff596d0 | pbrook | len -= n; |
81 | 0ff596d0 | pbrook | if (len)
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82 | 0ff596d0 | pbrook | memcpy(eeprom->data, buf + n, len); |
83 | 3fffc223 | ths | } |
84 | 3fffc223 | ths | |
85 | 0ff596d0 | pbrook | static uint8_t eeprom_read_data(SMBusDevice *dev, uint8_t cmd, int n) |
86 | 3fffc223 | ths | { |
87 | 3fffc223 | ths | SMBusEEPROMDevice *eeprom = (SMBusEEPROMDevice *) dev; |
88 | 0ff596d0 | pbrook | /* If this is the first byte then set the current position. */
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89 | 0ff596d0 | pbrook | if (n == 0) |
90 | 0ff596d0 | pbrook | eeprom->offset = cmd; |
91 | 0ff596d0 | pbrook | /* As with writes, we implement block reads without the
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92 | 0ff596d0 | pbrook | SMBus length byte. */
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93 | 0ff596d0 | pbrook | return eeprom_receive_byte(dev);
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94 | 3fffc223 | ths | } |
95 | 3fffc223 | ths | |
96 | 0ff596d0 | pbrook | void smbus_eeprom_device_init(i2c_bus *bus, uint8_t addr, uint8_t *buf)
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97 | 3fffc223 | ths | { |
98 | 0ff596d0 | pbrook | SMBusEEPROMDevice *eeprom; |
99 | 3b46e624 | ths | |
100 | 0ff596d0 | pbrook | eeprom = (SMBusEEPROMDevice *)smbus_device_init(bus, addr, |
101 | 0ff596d0 | pbrook | sizeof(SMBusEEPROMDevice));
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102 | 0ff596d0 | pbrook | |
103 | 3fffc223 | ths | eeprom->dev.quick_cmd = eeprom_quick_cmd; |
104 | 3fffc223 | ths | eeprom->dev.send_byte = eeprom_send_byte; |
105 | 3fffc223 | ths | eeprom->dev.receive_byte = eeprom_receive_byte; |
106 | 0ff596d0 | pbrook | eeprom->dev.write_data = eeprom_write_data; |
107 | 0ff596d0 | pbrook | eeprom->dev.read_data = eeprom_read_data; |
108 | 3fffc223 | ths | eeprom->data = buf; |
109 | 3fffc223 | ths | eeprom->offset = 0;
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110 | 3fffc223 | ths | } |