Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | Retrieve encoded MAC address from 24C16 serial 2-wire EEPROM, | |
3 | decode it and store it in the associated adapter struct for | |
4 | use by dvb_net.c | |
5 | ||
6 | This card appear to have the 24C16 write protect held to ground, | |
7 | thus permitting normal read/write operation. Theoretically it | |
8 | would be possible to write routines to burn a different (encoded) | |
9 | MAC address into the EEPROM. | |
10 | ||
11 | Robert Schlabbach GMX | |
12 | Michael Glaum KVH Industries | |
13 | Holger Waechtler Convergence | |
14 | ||
15 | Copyright (C) 2002-2003 Ralph Metzler <rjkm@metzlerbros.de> | |
50c25fff | 16 | Metzler Brothers Systementwicklung GbR |
1da177e4 LT |
17 | |
18 | This program is free software; you can redistribute it and/or modify | |
19 | it under the terms of the GNU General Public License as published by | |
20 | the Free Software Foundation; either version 2 of the License, or | |
21 | (at your option) any later version. | |
22 | ||
23 | This program is distributed in the hope that it will be useful, | |
24 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | GNU General Public License for more details. | |
27 | ||
28 | You should have received a copy of the GNU General Public License | |
29 | along with this program; if not, write to the Free Software | |
30 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
31 | ||
32 | */ | |
33 | ||
34 | #include <asm/errno.h> | |
35 | #include <linux/init.h> | |
36 | #include <linux/module.h> | |
37 | #include <linux/string.h> | |
38 | #include <linux/i2c.h> | |
39 | ||
15ac8e66 | 40 | #include "ttpci-eeprom.h" |
1da177e4 LT |
41 | |
42 | #if 1 | |
43 | #define dprintk(x...) do { printk(x); } while (0) | |
44 | #else | |
45 | #define dprintk(x...) do { } while (0) | |
46 | #endif | |
47 | ||
48 | ||
49 | static int check_mac_tt(u8 *buf) | |
50 | { | |
9101e622 MCC |
51 | int i; |
52 | u16 tmp = 0xffff; | |
53 | ||
54 | for (i = 0; i < 8; i++) { | |
55 | tmp = (tmp << 8) | ((tmp >> 8) ^ buf[i]); | |
56 | tmp ^= (tmp >> 4) & 0x0f; | |
57 | tmp ^= (tmp << 12) ^ ((tmp & 0xff) << 5); | |
58 | } | |
59 | tmp ^= 0xffff; | |
60 | return (((tmp >> 8) ^ buf[8]) | ((tmp & 0xff) ^ buf[9])); | |
1da177e4 LT |
61 | } |
62 | ||
63 | static int getmac_tt(u8 * decodedMAC, u8 * encodedMAC) | |
64 | { | |
9101e622 | 65 | u8 xor[20] = { 0x72, 0x23, 0x68, 0x19, 0x5c, 0xa8, 0x71, 0x2c, |
1da177e4 LT |
66 | 0x54, 0xd3, 0x7b, 0xf1, 0x9E, 0x23, 0x16, 0xf6, |
67 | 0x1d, 0x36, 0x64, 0x78}; | |
9101e622 MCC |
68 | u8 data[20]; |
69 | int i; | |
1da177e4 LT |
70 | |
71 | /* In case there is a sig check failure have the orig contents available */ | |
72 | memcpy(data, encodedMAC, 20); | |
73 | ||
74 | for (i = 0; i < 20; i++) | |
9101e622 MCC |
75 | data[i] ^= xor[i]; |
76 | for (i = 0; i < 10; i++) | |
77 | data[i] = ((data[2 * i + 1] << 8) | data[2 * i]) | |
1da177e4 LT |
78 | >> ((data[2 * i + 1] >> 6) & 3); |
79 | ||
9101e622 MCC |
80 | if (check_mac_tt(data)) |
81 | return -ENODEV; | |
1da177e4 LT |
82 | |
83 | decodedMAC[0] = data[2]; decodedMAC[1] = data[1]; decodedMAC[2] = data[0]; | |
84 | decodedMAC[3] = data[6]; decodedMAC[4] = data[5]; decodedMAC[5] = data[4]; | |
9101e622 | 85 | return 0; |
1da177e4 LT |
86 | } |
87 | ||
88 | static int ttpci_eeprom_read_encodedMAC(struct i2c_adapter *adapter, u8 * encodedMAC) | |
89 | { | |
90 | int ret; | |
91 | u8 b0[] = { 0xcc }; | |
92 | ||
93 | struct i2c_msg msg[] = { | |
94 | { .addr = 0x50, .flags = 0, .buf = b0, .len = 1 }, | |
95 | { .addr = 0x50, .flags = I2C_M_RD, .buf = encodedMAC, .len = 20 } | |
96 | }; | |
97 | ||
3ca7fc84 | 98 | /* dprintk("%s\n", __func__); */ |
1da177e4 LT |
99 | |
100 | ret = i2c_transfer(adapter, msg, 2); | |
101 | ||
102 | if (ret != 2) /* Assume EEPROM isn't there */ | |
103 | return (-ENODEV); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | ||
109 | int ttpci_eeprom_parse_mac(struct i2c_adapter *adapter, u8 *proposed_mac) | |
110 | { | |
111 | int ret, i; | |
112 | u8 encodedMAC[20]; | |
113 | u8 decodedMAC[6]; | |
114 | ||
115 | ret = ttpci_eeprom_read_encodedMAC(adapter, encodedMAC); | |
116 | ||
117 | if (ret != 0) { /* Will only be -ENODEV */ | |
118 | dprintk("Couldn't read from EEPROM: not there?\n"); | |
119 | memset(proposed_mac, 0, 6); | |
120 | return ret; | |
121 | } | |
122 | ||
123 | ret = getmac_tt(decodedMAC, encodedMAC); | |
124 | if( ret != 0 ) { | |
125 | dprintk("adapter failed MAC signature check\n"); | |
126 | dprintk("encoded MAC from EEPROM was " ); | |
127 | for(i=0; i<19; i++) { | |
128 | dprintk( "%.2x:", encodedMAC[i]); | |
129 | } | |
130 | dprintk("%.2x\n", encodedMAC[19]); | |
131 | memset(proposed_mac, 0, 6); | |
132 | return ret; | |
133 | } | |
134 | ||
135 | memcpy(proposed_mac, decodedMAC, 6); | |
136 | dprintk("adapter has MAC addr = %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n", | |
137 | decodedMAC[0], decodedMAC[1], decodedMAC[2], | |
138 | decodedMAC[3], decodedMAC[4], decodedMAC[5]); | |
139 | return 0; | |
140 | } | |
141 | ||
142 | EXPORT_SYMBOL(ttpci_eeprom_parse_mac); | |
143 | ||
144 | MODULE_LICENSE("GPL"); | |
145 | MODULE_AUTHOR("Ralph Metzler, Marcus Metzler, others"); | |
146 | MODULE_DESCRIPTION("Decode dvb_net MAC address from EEPROM of PCI DVB cards " | |
147 | "made by Siemens, Technotrend, Hauppauge"); |