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authorJean Delvare <khali@linux-fr.org>2009-12-09 20:36:05 +0100
committerJean Delvare <khali@linux-fr.org>2009-12-09 20:36:05 +0100
commit3d849981711741e76e501e4b9e3e7b792f2b0fd5 (patch)
tree0948d147f41b9d637cd2b2ef9afb044983dcd59f /Documentation
parentd656b6fde2531a13c4e68a3ce6b9f12bc19d96bb (diff)
downloadlinux-stericsson-3d849981711741e76e501e4b9e3e7b792f2b0fd5.tar.gz
hwmon: (adt7475) Add support for the ADT7490
Add support for the Analog Devices ADT7490 chip. This chip is largely compatible with the ADT7473 and ADT7475, with additional features. In particular, it has 6 voltage inputs instead of 2. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Jordan Crouse <jordan@cosmicpenguin.net> Cc: "Darrick J. Wong" <djwong@us.ibm.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/hwmon/adt747534
1 files changed, 29 insertions, 5 deletions
diff --git a/Documentation/hwmon/adt7475 b/Documentation/hwmon/adt7475
index ebfee5524020..f08f28715b84 100644
--- a/Documentation/hwmon/adt7475
+++ b/Documentation/hwmon/adt7475
@@ -10,24 +10,31 @@ Supported chips:
Prefix: 'adt7475'
Addresses scanned: I2C 0x2E
Datasheet: Publicly available at the On Semiconductors website
+ * Analog Devices ADT7490
+ Prefix: 'adt7490'
+ Addresses scanned: I2C 0x2C, 0x2D, 0x2E
+ Datasheet: Publicly available at the On Semiconductors website
Authors:
Jordan Crouse
Hans de Goede
Darrick J. Wong (documentation)
+ Jean Delvare
Description
-----------
-This driver implements support for the Analog Devices ADT7473 and ADT7475
-chip family. Both chips differ only in minor details. They will be
-collectively designed by the name "ADT747x" in the rest of this document.
+This driver implements support for the Analog Devices ADT7473, ADT7475 and
+ADT7490 chip family. The ADT7473 and ADT7475 differ only in minor details.
+The ADT7490 has additional features, including extra voltage measurement
+inputs and PECI support. All the supported chips will be collectively
+designed by the name "ADT747x" in the rest of this document.
The ADT747x uses the 2-wire interface compatible with the SMBus 2.0
specification. Using an analog to digital converter it measures three (3)
-temperatures and two (2) voltages. It has four (4) 16-bit counters for
-measuring fan speed. There are three (3) PWM outputs that can be used
+temperatures and two (2) or more voltages. It has four (4) 16-bit counters
+for measuring fan speed. There are three (3) PWM outputs that can be used
to control fan speed.
A sophisticated control system for the PWM outputs is designed into the
@@ -45,6 +52,23 @@ The ADT747x samples all inputs continuously. The driver will not read
the registers more often than once every other second. Further,
configuration data is only read once per minute.
+Chip Differences Summary
+------------------------
+
+ADT7473:
+ * 2 voltage inputs
+ * system acoustics optimizations (not implemented)
+
+ADT7475:
+ * 2 voltage inputs
+
+ADT7490:
+ * 6 voltage inputs
+ * 1 Imon input (not implemented)
+ * PECI support (not implemented)
+ * 2 GPIO pins (not implemented)
+ * system acoustics optimizations (not implemented)
+
Special Features
----------------