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sensors-detect: Speed up the LM75 and LM77 detection. The previous code

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was using a brute force approach, quite reliable but very slow. The new
code should be just as reliable but about ten times faster.


git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@4312 7894878c-1315-0410-8ee3-d5d059ff63e0
This commit is contained in:
Jean Delvare committed 2007-01-25 09:18:23 +00:00
1 parent db652c9e92
commit f1a8ba3d1d
2 files changed
+5 -24
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CHANGES
+1
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@@ -9,6 +9,7 @@ SVN HEAD
Add VIA CX700 detection
Drop legacy W83627HF ISA detection
Don't bufferize stdout during probes
Speed up the LM75 and LM77 detection
2.10.2 (20070115)
prog/detect/sensors-detect
+4 -24
View File
@@ -3314,7 +3314,6 @@ sub lm75_detect
my $i;
my ($file,$addr) = @_;
my $cur = i2c_smbus_read_word_data($file,0x00);
my $cur_varies = 0;
my $conf = i2c_smbus_read_byte_data($file,0x01);
my $hyst = i2c_smbus_read_word_data($file,0x02);
@@ -3329,25 +3328,14 @@ sub lm75_detect
return if i2c_smbus_read_word_data($file,0x06) != $os;
return if i2c_smbus_read_word_data($file,0x07) != $os;
for ($i = 0x00; $i < 0xff; $i += 8) {
for ($i = 8; $i <= 248; $i += 40) {
return if i2c_smbus_read_byte_data($file, $i + 0x01) != $conf;
return if i2c_smbus_read_word_data($file, $i + 0x02) != $hyst;
return if i2c_smbus_read_word_data($file, $i + 0x04) != $hyst;
return if i2c_smbus_read_word_data($file, $i + 0x05) != $hyst;
return if i2c_smbus_read_word_data($file, $i + 0x06) != $hyst;
return if i2c_smbus_read_word_data($file, $i + 0x07) != $hyst;
return if i2c_smbus_read_word_data($file, $i + 0x03) != $os;
return if i2c_smbus_read_word_data($file, $i + 0x04) != $os;
return if i2c_smbus_read_word_data($file, $i + 0x05) != $os;
return if i2c_smbus_read_word_data($file, $i + 0x06) != $os;
return if i2c_smbus_read_word_data($file, $i + 0x07) != $os;
$cur_varies = 1
if (! $cur_varies) and
i2c_smbus_read_word_data($file, $i) != $cur;
}
# All registers hold the same value, obviously a misdetection
return if (! $cur_varies) and $conf == ($cur & 0xff) and $cur == $hyst
return if $conf == ($cur & 0xff) and $cur == $hyst
and $cur == $os;
$cur = swap_bytes($cur);
@@ -3389,7 +3377,6 @@ sub lm77_detect
my $i;
my ($file,$addr) = @_;
my $cur = i2c_smbus_read_word_data($file,0x00);
my $cur_varies = 0;
my $conf = i2c_smbus_read_byte_data($file,0x01);
my $hyst = i2c_smbus_read_word_data($file,0x02);
my $os = i2c_smbus_read_word_data($file,0x03);
@@ -3402,23 +3389,16 @@ sub lm77_detect
return if i2c_smbus_read_word_data($file,0x06) != $high;
return if i2c_smbus_read_word_data($file,0x07) != $high;
for ($i = 0x00; $i < 0xff; $i += 8) {
for ($i = 8; $i <= 248; $i += 40) {
return if i2c_smbus_read_byte_data($file, $i + 0x01) != $conf;
return if i2c_smbus_read_word_data($file, $i + 0x02) != $hyst;
return if i2c_smbus_read_word_data($file, $i + 0x03) != $os;
return if i2c_smbus_read_word_data($file, $i + 0x04) != $low;
return if i2c_smbus_read_word_data($file, $i + 0x06) != $low;
return if i2c_smbus_read_word_data($file, $i + 0x07) != $low;
return if i2c_smbus_read_word_data($file, $i + 0x05) != $high;
return if i2c_smbus_read_word_data($file, $i + 0x06) != $high;
return if i2c_smbus_read_word_data($file, $i + 0x07) != $high;
$cur_varies = 1
if (! $cur_varies) and
i2c_smbus_read_word_data($file, $i) != $cur;
}
# All registers hold the same value, obviously a misdetection
return if (! $cur_varies) and $conf == ($cur & 0xff) and $cur == $hyst
return if $conf == ($cur & 0xff) and $cur == $hyst
and $cur == $os and $cur == $low and $cur == $high;
$cur = swap_bytes($cur);