mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 08:19:28 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mass ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
Retrieve encoded MAC address from 24C16 serial 2-wire EEPROM,
|
|
decode it and store it in the associated adapter struct for
|
|
use by dvb_net.c
|
|
|
|
This card appear to have the 24C16 write protect held to ground,
|
|
thus permitting normal read/write operation. Theoretically it
|
|
would be possible to write routines to burn a different (encoded)
|
|
MAC address into the EEPROM.
|
|
|
|
Robert Schlabbach GMX
|
|
Michael Glaum KVH Industries
|
|
Holger Waechtler Convergence
|
|
|
|
Copyright (C) 2002-2003 Ralph Metzler <rjkm@metzlerbros.de>
|
|
Metzler Brothers Systementwicklung GbR
|
|
|
|
|
|
*/
|
|
|
|
#include <asm/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/etherdevice.h>
|
|
|
|
#include "ttpci-eeprom.h"
|
|
|
|
#if 1
|
|
#define dprintk(x...) do { printk(x); } while (0)
|
|
#else
|
|
#define dprintk(x...) do { } while (0)
|
|
#endif
|
|
|
|
|
|
static int check_mac_tt(u8 *buf)
|
|
{
|
|
int i;
|
|
u16 tmp = 0xffff;
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
tmp = (tmp << 8) | ((tmp >> 8) ^ buf[i]);
|
|
tmp ^= (tmp >> 4) & 0x0f;
|
|
tmp ^= (tmp << 12) ^ ((tmp & 0xff) << 5);
|
|
}
|
|
tmp ^= 0xffff;
|
|
return (((tmp >> 8) ^ buf[8]) | ((tmp & 0xff) ^ buf[9]));
|
|
}
|
|
|
|
static int getmac_tt(u8 * decodedMAC, u8 * encodedMAC)
|
|
{
|
|
u8 xor[20] = { 0x72, 0x23, 0x68, 0x19, 0x5c, 0xa8, 0x71, 0x2c,
|
|
0x54, 0xd3, 0x7b, 0xf1, 0x9E, 0x23, 0x16, 0xf6,
|
|
0x1d, 0x36, 0x64, 0x78};
|
|
u8 data[20];
|
|
int i;
|
|
|
|
/* In case there is a sig check failure have the orig contents available */
|
|
memcpy(data, encodedMAC, 20);
|
|
|
|
for (i = 0; i < 20; i++)
|
|
data[i] ^= xor[i];
|
|
for (i = 0; i < 10; i++)
|
|
data[i] = ((data[2 * i + 1] << 8) | data[2 * i])
|
|
>> ((data[2 * i + 1] >> 6) & 3);
|
|
|
|
if (check_mac_tt(data))
|
|
return -ENODEV;
|
|
|
|
decodedMAC[0] = data[2]; decodedMAC[1] = data[1]; decodedMAC[2] = data[0];
|
|
decodedMAC[3] = data[6]; decodedMAC[4] = data[5]; decodedMAC[5] = data[4];
|
|
return 0;
|
|
}
|
|
|
|
int ttpci_eeprom_decode_mac(u8 *decodedMAC, u8 *encodedMAC)
|
|
{
|
|
u8 xor[20] = { 0x72, 0x23, 0x68, 0x19, 0x5c, 0xa8, 0x71, 0x2c,
|
|
0x54, 0xd3, 0x7b, 0xf1, 0x9E, 0x23, 0x16, 0xf6,
|
|
0x1d, 0x36, 0x64, 0x78};
|
|
u8 data[20];
|
|
int i;
|
|
|
|
memcpy(data, encodedMAC, 20);
|
|
|
|
for (i = 0; i < 20; i++)
|
|
data[i] ^= xor[i];
|
|
for (i = 0; i < 10; i++)
|
|
data[i] = ((data[2 * i + 1] << 8) | data[2 * i])
|
|
>> ((data[2 * i + 1] >> 6) & 3);
|
|
|
|
if (check_mac_tt(data))
|
|
return -ENODEV;
|
|
|
|
decodedMAC[0] = data[2];
|
|
decodedMAC[1] = data[1];
|
|
decodedMAC[2] = data[0];
|
|
decodedMAC[3] = data[6];
|
|
decodedMAC[4] = data[5];
|
|
decodedMAC[5] = data[4];
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ttpci_eeprom_decode_mac);
|
|
|
|
static int ttpci_eeprom_read_encodedMAC(struct i2c_adapter *adapter, u8 * encodedMAC)
|
|
{
|
|
int ret;
|
|
u8 b0[] = { 0xcc };
|
|
|
|
struct i2c_msg msg[] = {
|
|
{ .addr = 0x50, .flags = 0, .buf = b0, .len = 1 },
|
|
{ .addr = 0x50, .flags = I2C_M_RD, .buf = encodedMAC, .len = 20 }
|
|
};
|
|
|
|
/* dprintk("%s\n", __func__); */
|
|
|
|
ret = i2c_transfer(adapter, msg, 2);
|
|
|
|
if (ret != 2) /* Assume EEPROM isn't there */
|
|
return (-ENODEV);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int ttpci_eeprom_parse_mac(struct i2c_adapter *adapter, u8 *proposed_mac)
|
|
{
|
|
int ret;
|
|
u8 encodedMAC[20];
|
|
u8 decodedMAC[6];
|
|
|
|
ret = ttpci_eeprom_read_encodedMAC(adapter, encodedMAC);
|
|
|
|
if (ret != 0) { /* Will only be -ENODEV */
|
|
dprintk("Couldn't read from EEPROM: not there?\n");
|
|
eth_zero_addr(proposed_mac);
|
|
return ret;
|
|
}
|
|
|
|
ret = getmac_tt(decodedMAC, encodedMAC);
|
|
if( ret != 0 ) {
|
|
dprintk("adapter failed MAC signature check\n");
|
|
dprintk("encoded MAC from EEPROM was %*phC",
|
|
(int)sizeof(encodedMAC), &encodedMAC);
|
|
eth_zero_addr(proposed_mac);
|
|
return ret;
|
|
}
|
|
|
|
memcpy(proposed_mac, decodedMAC, 6);
|
|
dprintk("adapter has MAC addr = %pM\n", decodedMAC);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(ttpci_eeprom_parse_mac);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Ralph Metzler, Marcus Metzler, others");
|
|
MODULE_DESCRIPTION("Decode dvb_net MAC address from EEPROM of PCI DVB cards made by Siemens, Technotrend, Hauppauge");
|