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support detection of eeprom shadows we now know are

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software write-protect registers.
      prevent Vaio detection from running more than once.
      update eeprom driver documentation.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@2448 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Mark D. Studebaker
2004-04-18 00:38:28 +00:00
parent ef2e3e0b1d
commit 49754b948f
3 changed files with 59 additions and 18 deletions
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1
CHANGES
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@@ -45,6 +45,7 @@ ask CVS about it:
Explicitely support ADM1028
Scan all logical devices of PC87365 and PC87366
Detect LM92, LM76, MAX6633, MAX6634, MAX6635
Detect eeproms with software write protect
2.8.6 (20040405)

26
doc/chips/eeprom
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@@ -7,9 +7,15 @@ Supported chips:
* Any EEPROM chip in the designated address range
Prefix `eeprom'
Addresses scanned: I2C 0x50 - 0x57 (inclusive)
Datasheets: Publicly available from Atmel (www.atmel.com),
Fairchild (www.fairchildsemi.com), and
Microchip (www.microchip.com)
Datasheets: Publicly available from:
Atmel (www.atmel.com),
Catalyst (www.catsemi.com),
Fairchild (www.fairchildsemi.com),
Microchip (www.microchip.com),
Philips (www.semiconductor.philips.com),
Rohm (www.rohm.com),
ST (www.st.com),
Xicor (www.xicor.com)
Chip Size (bits) Address
24C01 1K 0x50 (shadows at 0x51 - 0x57)
@@ -21,6 +27,8 @@ Supported chips:
0x53, 0x55, 0x56, 0x57)
24C16 16K 0x50 (additional data at 0x51 - 0x57)
Sony 2K 0x57
Microchip 24AA52 2K 0x50 - 0x57, SW write protect at 0x30-37
ST M34C02 2K 0x50 - 0x57, SW write protect at 0x30-37
Author: Frodo Looijaard <frodol@dds.nl> and Philip Edelbrock
@@ -72,6 +80,15 @@ eeprom.
Recent Sony Vaio laptops have an EEPROM at 0x57. We couldn't get the
specification, so it is guess work and far from being complete.
The Microchip 24AA52/24LCS52 and the ST M34C02 support an additional
software write protect register at 0x30 - 0x37 (0x20 less than the
memory location). The chip responds to "write quick" detection at this
address but does not respond to byte reads.
If this register is present, the lower 128 bytes of the memory
array are not write protected. Any byte data write to this address
will write protect the memory array permanently, and the device
will no longer respond at the 0x30-37 address.
The eeprom driver does not support this register.
Lacking functionality:
@@ -84,7 +101,8 @@ These devices require two-byte address fields and are not supported.
* Enable Writing. Again, no technical reason why not, but making it easy
to change the contents of the EEPROMs (on DIMMs anyway) also makes it easy
to disable the DIMMs until the values are restored somehow.
to disable the DIMMs (potentially preventing the computer from booting)
until the values are restored somehow.
Use:

50
prog/detect/sensors-detect
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@@ -1245,6 +1245,12 @@ use subs qw(mtp008_detect lm78_detect lm78_isa_detect lm78_alias_detect
i2c_addrs => [0x57],
i2c_detect => sub { eeprom_detect 1, @_ },
},
{
name => "SPD EEPROM with Software Write-Protect",
driver => "eeprom",
i2c_addrs => [0x50..0x57],
i2c_detect => sub { eeprom_detect 2, @_ },
},
{
name => "LTC1710",
driver => "ltc1710",
@@ -3672,7 +3678,8 @@ sub ite_alias_detect
return 1;
}
# $_[0]: Chip to detect (0 = SPD EEPROM, 1 = Sony Vaio EEPROM)
# $_[0]: Chip to detect (0 = SPD EEPROM, 1 = Sony Vaio EEPROM
# 2 = SPD EEPROM with Software Write Protect)
# $_[1]: A reference to the file descriptor to access this chip
# $_[2]: Address
# Returns: 8 for a memory eeprom, 4 to 9 for a Sony Vaio eeprom,
@@ -3687,17 +3694,37 @@ sub ite_alias_detect
sub eeprom_detect
{
my ($chip,$file,$addr) = @_;
my $checksum = 0;
# Check the checksum for validity (works for most DIMMs and RIMMs)
my $checksum = 0;
for (my $i = 0; $i <= 62; $i ++) {
$checksum += i2c_smbus_read_byte_data($file,$i);
if ($chip != 1) {
for (my $i = 0; $i <= 62; $i ++) {
$checksum += i2c_smbus_read_byte_data($file,$i);
}
$checksum &= 255;
$checksum -= i2c_smbus_read_byte_data($file,63);
}
if ($chip == 0) {
if($checksum == 0) {
return 8;
} else {
return 1;
}
}
if ($chip == 2) {
# check for 'shadow' write-protect register at 0x30-37
i2c_set_slave_addr($file,$addr - 0x20);
if(i2c_smbus_write_quick($file,$SMBUS_WRITE) >= 0 &&
i2c_smbus_read_byte_data($file,0x80) == -1) {
if($checksum == 0) {
return (9, $addr - 0x20);
} else {
return (2, $addr - 0x20);
}
}
}
$checksum &= 255;
return 8
if $chip == 0 and i2c_smbus_read_byte_data($file,63) == $checksum;
# Look for a Sony Vaio EEPROM
# Look for a Sony Vaio EEPROM ($chip == 1)
my $vaioconf = 1;
$vaioconf += 4
if i2c_smbus_read_byte_data($file,0x80) == 0x50
@@ -3718,14 +3745,9 @@ sub eeprom_detect
if $vaioconf > 9;
if ($vaioconf > 1) {
return if $chip != 1;
return $vaioconf;
}
# Even if all tests fail, it still may be an eeprom
return if $chip != 0;
# Default to SPD EEPROM
return 1;
return;
}
# $_[0]: A reference to the file descriptor to access this chip.