[PATCH] sensors-detect: Add detection of MAX6642

[Per Dalén <per.dalen@xxxxxxxxxxxx>]

This patch adds detection of MAX6642 to sensors-detect.

Signed-off-by: Per Dalen <per.dalen@xxxxxxxxxxxx>
---

--- prog/detect/sensors-detect  (revision 5975)
+++ prog/detect/sensors-detect  (working copy)
@@ -848,6 +848,11 @@
                i2c_addrs => [0x2c, 0x2e, 0x2f],
                i2c_detect => sub { max6639_detect(@_); },
        }, {
+               name => "Maxim MAX6642",
+               driver => "max6642",
+               i2c_addrs => [0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e,
0x4f],
+               i2c_detect => sub { max6642_detect(@_); },
+       }, {
                name => "Maxim MAX6655/MAX6656",
                driver => "max6655",
                i2c_addrs => [0x18..0x1a, 0x29..0x2b, 0x4c..0x4e],
@@ -5779,6 +5784,36 @@
        return 6;
 }

+# 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 the
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, NO_CACHE);
+       return if i2c_smbus_read_byte_data($file, 0x04, NO_CACHE) !=
$man_id;
+       $status = i2c_smbus_read_byte_data($file, 0x02, NO_CACHE);
+       return if i2c_smbus_read_byte_data($file, 0x06, NO_CACHE) !=
$status;
+       $conf = i2c_smbus_read_byte_data($file, 0x03, NO_CACHE);
+       return if i2c_smbus_read_byte_data($file, 0xff, NO_CACHE) != $conf;
+
+       return unless $man_id == 0x4d;  # Maxim
+       # Bit 5, 3, 1 and 0 should be zero
+       return unless ($status & 0x2b) == 0x00;
+       # The 4 lower bits should be zero
+       return unless ($conf & 0x0f) == 0x00;
+
+       return 6;
+}
+
 sub max6655_detect
 {
        my ($file, $addr) = @_;

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