[lm-sensors] [PATCH 2/2] sensors-detect: Add detection of NCT7802Y

[Guenter Roeck <linux@roeck-us.net>]

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
 CHANGES                    |  1 +
 prog/detect/sensors-detect | 68 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+)

diff --git a/CHANGES b/CHANGES
index 3390942..a16e7be 100644
--- a/CHANGES
+++ b/CHANGES
@@ -13,6 +13,7 @@ SVN HEAD
                   Add detection of ITE IT8620E and IT8623E
                   Add detection of TMP441, TMP442, LM95233, LM95234,
                   and LM95235
+                  Add detection of NCT7802Y
 
 3.3.5 "Happy Birthday Beddy" (2014-01-22)
   libsensors: Improve documentation of two functions
diff --git a/prog/detect/sensors-detect b/prog/detect/sensors-detect
index df9a408..159d2cb 100755
--- a/prog/detect/sensors-detect
+++ b/prog/detect/sensors-detect
@@ -733,6 +733,11 @@ use vars qw(@i2c_adapter_names);
 		i2c_addrs => [0x2c..0x2f],
 		i2c_detect => sub { w83795_detect(@_); },
 	}, {
+		name => "Nuvoton NCT7802Y",
+		driver => "to-be-written",
+		i2c_addrs => [0x28..0x2f],
+		i2c_detect => sub { nct7802_detect(@_); },
+	}, {
 		name => "Winbond W83627HF",
 		driver => "use-isa-instead",
 		i2c_addrs => [0x28..0x2f],
@@ -5483,6 +5488,69 @@ sub w83795_detect
 }
 
 # Registers used:
+#   0x00: bank selection (Bank 0, 1)
+#   0x40, 0x80, 0xc0: bank selection (Bank 1)
+#   0x01, 0x41, 0x81, 0xc1: PECI control register 1 (Bank 1)
+#   0x02, 0x42, 0x82, 0xc2: PECI control register 2 (Bank 1)
+#   0x03, 0x43, 0x83, 0xc3: PECI control register 3 (Bank 1)
+#   0xfd: Vendor ID (Bank 0)
+#   0xfe: Device ID (Bank 0)
+#   0xff: Device Revision (Bank 0)
+sub nct7802_detect
+{
+	my ($bank, $reg, $pc1, $pc2, $pc3);
+	my ($file, $addr) = @_;
+
+	$bank = i2c_smbus_read_byte_data($file, 0x00);
+	return unless ($bank = 0x00 or $bank = 0x01);
+
+	# we can not do much if bank 1 is selected
+	if ($bank = 0x01) {
+		# We can not use bit masks since all bits
+		# (including reserved bits) can be set.
+		$pc1 = i2c_smbus_read_byte_data($file, 0x01);
+		$pc2 = i2c_smbus_read_byte_data($file, 0x02);
+		$pc3 = i2c_smbus_read_byte_data($file, 0x03);
+
+		# Register values repeat every 64 registers on bank 1.
+		# Check the first four registers of each group.
+		for (my $i = 0x40; $i <= 0xc0; $i += 0x40) {
+			$reg = i2c_smbus_read_byte_data($file, $i);
+			return if $reg != 0x01;
+			$reg = i2c_smbus_read_byte_data($file, $i + 1);
+			return if $reg != $pc1;
+			$reg = i2c_smbus_read_byte_data($file, $i + 2);
+			return if $reg != $pc2;
+			$reg = i2c_smbus_read_byte_data($file, $i + 3);
+			return if $reg != $pc3;
+		}
+		return 3;
+	}
+
+	# bank 0, can support real chip detection
+
+	$reg = i2c_smbus_read_byte_data($file, 0xfd);
+	return unless ($reg = 0x50);
+
+	$reg = i2c_smbus_read_byte_data($file, 0xfe);
+	return unless $reg = 0xc3;
+
+	$reg = i2c_smbus_read_byte_data($file, 0xff);
+	return unless ($reg & 0xf0) = 0x20;
+
+	$reg = i2c_smbus_read_byte_data($file, 0x05);
+	return unless ($reg & 0x1f) = 0x00;
+
+	$reg = i2c_smbus_read_byte_data($file, 0x08);
+	return unless ($reg & 0x3f) = 0x00;
+
+	$reg = i2c_smbus_read_byte_data($file, 0x0f);
+	return unless ($reg & 0x3f) = 0x00;
+
+	return 8;
+}
+
+# Registers used:
 #   0x48: Full I2C Address
 #   0x4e: Vendor ID byte selection
 #   0x4f: Vendor ID
-- 
1.9.1


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