sensors-detect: Add detection of NCT7802Y

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@6253 7894878c-1315-0410-8ee3-d5d059ff63e0

2 files changed, 47 insertions, 0 deletions

diff --git a/CHANGES b/CHANGES
index 33909421..a16e7be3 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 1208f4d9..9ce0cf2e 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 +5488,47 @@ sub w83795_detect
 }
 
 # Registers used:
+#   0x00: Bank selection (Bank 0, 1)
+#   0x05: Temperature readout register LSB (Bank 0)
+#   0x08: PECI temperature readout register LSB (Bank 0)
+#   0x0f: Voltage readout register LSB (Bank 0)
+#   0xfd: Vendor ID (Bank 0)
+#   0xfe: Device ID (Bank 0)
+#   0xff: Device Revision (Bank 0)
+#
+# Note that identification registers are not accessible in bank 1,
+# and there is no usable other means to identify the chip if bank 1
+# is selected. Only detect chip if bank 0 is selected.
+sub nct7802_detect
+{
+	my ($bank, $reg);
+	my ($file, $addr) = @_;
+
+	$bank = i2c_smbus_read_byte_data($file, 0x00);
+	return unless $bank == 0x00;
+
+	$reg = i2c_smbus_read_byte_data($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