This patch adds detection for TI's TMP421, TMP422 and TMP423 chips to
sensors-detect. Only the manufactory ID and the device ID is used for
detection. I hope this is reliable enough.
---
sensors-detect | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
Index: sensors/prog/detect/sensors-detect
===================================================================
--- sensors.orig/prog/detect/sensors-detect 2009-07-10 22:15:41.000000000 +0200
+++ sensors/prog/detect/sensors-detect 2009-07-12 19:26:14.000000000 +0200
@@ -908,6 +908,21 @@
i2c_addrs => [0x4c..0x4e],
i2c_detect => sub { lm90_detect(@_, 10); },
}, {
+ name => "Texas Instruments TMP421",
+ driver => "tmp421",
+ i2c_addrs => [0x2a, 0x4c..0x4f],
+ i2c_detect => sub { tmp42x_detect(@_, 0); },
+ }, {
+ name => "Texas Instruments TMP422",
+ driver => "tmp421",
+ i2c_addrs => [0x2a, 0x4c..0x4f],
+ i2c_detect => sub { tmp42x_detect(@_, 1); },
+ }, {
+ name => "Texas Instruments TMP423",
+ driver => "tmp421",
+ i2c_addrs => [0x2a, 0x4c..0x4f],
+ i2c_detect => sub { tmp42x_detect(@_, 2); },
+ }, {
name => "National Semiconductor LM95231",
driver => "to-be-written",
i2c_addrs => [0x2b, 0x19, 0x2a],
@@ -3907,6 +3922,25 @@
}
# Registers used:
+# 0xfe: Manufactorer ID
+# 0xff: Device ID
+sub tmp42x_detect()
+{
+ my ($file, $addr, $chip) = @_;
+
+ my $mid = i2c_smbus_read_byte_data($file, 0xfe);
+ my $cid = i2c_smbus_read_byte_data($file, 0xff);
+
+ return if ($mid != 0x55);
+
+ return 6 if ($chip == 0 && $cid == 0x21); # TMP421
+ return 6 if ($chip == 1 && $cid == 0x22); # TMP422
+ return 6 if ($chip == 2 && $cid == 0x23); # TMP423
+
+ return;
+}
+
+# Registers used:
# 0x03: Configuration (no low nibble, returns the previous low nibble)
# 0x04: Conversion rate
# 0xfe: Manufacturer ID
