Changeset 5978 for lm-sensors/trunk/prog/detect

Timestamp:

06/01/11 18:20:05 (12 months ago)

Author:

groeck

Message:

Add detection of MAX6642

Files:

• lm-sensors/trunk/prog/detect/sensors-detect (modified) (2 diffs)

lm-sensors/trunk/prog/detect/sensors-detect

@@ -848 +848 @@
                 i2c_addrs => [0x2c, 0x2e, 0x2f],
                 i2c_detect => sub { max6639_detect(@_); },
+        }, {
+                name => "Maxim MAX6642",
+                driver => "max6642",
+                i2c_addrs => [0x48..0x4f],
+                i2c_detect => sub { max6642_detect(@_); },
         }, {
                 name => "Maxim MAX6655/MAX6656",
@@ -5790 +5795 @@
 }
 
+# Chip to detect: MAX6642
+# Registers used:
+#   0x02: Status register
+#   0x03: Configuration register
+#   0xfe: Manufacturer ID
+#   0x04, 0x06, 0xff: No registers
+# We use the 0x04, 0x06 and 0xff addresses (unused) to improve reliability.
+# These are not real registers and will always return the last returned value.
+# This isn't documented.
+sub max6642_detect
+{
+        my ($file, $addr) = @_;
+        my ($man_id, $conf, $status);
+
+        $man_id = i2c_smbus_read_byte_data($file, 0xfe);
+        return unless $man_id == 0x4d;  # Maxim
+        return if i2c_smbus_read_byte_data($file, 0x04, NO_CACHE) != $man_id;
+        return if i2c_smbus_read_byte_data($file, 0x06, NO_CACHE) != $man_id;
+        return if i2c_smbus_read_byte_data($file, 0xff, NO_CACHE) != $man_id;
+
+        $status = i2c_smbus_read_byte_data($file, 0x02);
+        # Bit 5, 3, 1 and 0 should be zero
+        return unless ($status & 0x2b) == 0x00;
+        return if i2c_smbus_read_byte_data($file, 0x04, NO_CACHE) != $status;
+        return if i2c_smbus_read_byte_data($file, 0x06, NO_CACHE) != $status;
+        return if i2c_smbus_read_byte_data($file, 0xff, NO_CACHE) != $status;
+
+        $conf = i2c_smbus_read_byte_data($file, 0x03);
+        # The 4 lower bits should be zero
+        return unless ($conf & 0x0f) == 0x00;
+
+        return 5;
+}
+
 sub max6655_detect
 {