148 lines
4.0 KiB
C
148 lines
4.0 KiB
C
/*
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Retrieve encoded MAC address from 24C16 serial 2-wire EEPROM,
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decode it and store it in the associated adapter struct for
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use by dvb_net.c
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This card appear to have the 24C16 write protect held to ground,
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thus permitting normal read/write operation. Theoretically it
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would be possible to write routines to burn a different (encoded)
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MAC address into the EEPROM.
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Robert Schlabbach GMX
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Michael Glaum KVH Industries
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Holger Waechtler Convergence
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Copyright (C) 2002-2003 Ralph Metzler <rjkm@metzlerbros.de>
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Metzler Brothers Systementwicklung GbR
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <asm/errno.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/i2c.h>
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#include "ttpci-eeprom.h"
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#if 1
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#define dprintk(x...) do { printk(x); } while (0)
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#else
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#define dprintk(x...) do { } while (0)
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#endif
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static int check_mac_tt(u8 *buf)
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{
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int i;
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u16 tmp = 0xffff;
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for (i = 0; i < 8; i++) {
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tmp = (tmp << 8) | ((tmp >> 8) ^ buf[i]);
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tmp ^= (tmp >> 4) & 0x0f;
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tmp ^= (tmp << 12) ^ ((tmp & 0xff) << 5);
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}
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tmp ^= 0xffff;
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return (((tmp >> 8) ^ buf[8]) | ((tmp & 0xff) ^ buf[9]));
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}
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static int getmac_tt(u8 * decodedMAC, u8 * encodedMAC)
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{
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u8 xor[20] = { 0x72, 0x23, 0x68, 0x19, 0x5c, 0xa8, 0x71, 0x2c,
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0x54, 0xd3, 0x7b, 0xf1, 0x9E, 0x23, 0x16, 0xf6,
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0x1d, 0x36, 0x64, 0x78};
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u8 data[20];
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int i;
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/* In case there is a sig check failure have the orig contents available */
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memcpy(data, encodedMAC, 20);
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for (i = 0; i < 20; i++)
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data[i] ^= xor[i];
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for (i = 0; i < 10; i++)
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data[i] = ((data[2 * i + 1] << 8) | data[2 * i])
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>> ((data[2 * i + 1] >> 6) & 3);
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if (check_mac_tt(data))
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return -ENODEV;
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decodedMAC[0] = data[2]; decodedMAC[1] = data[1]; decodedMAC[2] = data[0];
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decodedMAC[3] = data[6]; decodedMAC[4] = data[5]; decodedMAC[5] = data[4];
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return 0;
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}
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static int ttpci_eeprom_read_encodedMAC(struct i2c_adapter *adapter, u8 * encodedMAC)
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{
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int ret;
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u8 b0[] = { 0xcc };
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struct i2c_msg msg[] = {
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{ .addr = 0x50, .flags = 0, .buf = b0, .len = 1 },
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{ .addr = 0x50, .flags = I2C_M_RD, .buf = encodedMAC, .len = 20 }
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};
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/* dprintk("%s\n", __func__); */
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ret = i2c_transfer(adapter, msg, 2);
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if (ret != 2) /* Assume EEPROM isn't there */
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return (-ENODEV);
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return 0;
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}
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int ttpci_eeprom_parse_mac(struct i2c_adapter *adapter, u8 *proposed_mac)
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{
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int ret, i;
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u8 encodedMAC[20];
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u8 decodedMAC[6];
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ret = ttpci_eeprom_read_encodedMAC(adapter, encodedMAC);
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if (ret != 0) { /* Will only be -ENODEV */
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dprintk("Couldn't read from EEPROM: not there?\n");
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memset(proposed_mac, 0, 6);
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return ret;
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}
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ret = getmac_tt(decodedMAC, encodedMAC);
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if( ret != 0 ) {
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dprintk("adapter failed MAC signature check\n");
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dprintk("encoded MAC from EEPROM was " );
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for(i=0; i<19; i++) {
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dprintk( "%.2x:", encodedMAC[i]);
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}
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dprintk("%.2x\n", encodedMAC[19]);
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memset(proposed_mac, 0, 6);
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return ret;
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}
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memcpy(proposed_mac, decodedMAC, 6);
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dprintk("adapter has MAC addr = %.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
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decodedMAC[0], decodedMAC[1], decodedMAC[2],
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decodedMAC[3], decodedMAC[4], decodedMAC[5]);
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return 0;
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}
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EXPORT_SYMBOL(ttpci_eeprom_parse_mac);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ralph Metzler, Marcus Metzler, others");
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MODULE_DESCRIPTION("Decode dvb_net MAC address from EEPROM of PCI DVB cards "
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"made by Siemens, Technotrend, Hauppauge");
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