1 files changed, 53 insertions, 0 deletions

diff --git a/Documentation/hwmon/max6650 b/Documentation/hwmon/max6650
new file mode 100644
index 000000000000..8be7beb9e3e8
--- /dev/null
+++ b/Documentation/hwmon/max6650
@@ -0,0 +1,53 @@
+Kernel driver max6650
+=====================
+
+Supported chips:
+  * Maxim 6650 / 6651
+    Prefix: 'max6650'
+    Addresses scanned: I2C 0x1b, 0x1f, 0x48, 0x4b
+    Datasheet: http://pdfserv.maxim-ic.com/en/ds/MAX6650-MAX6651.pdf
+
+Authors:
+    Hans J. Koch <hjk@linutronix.de>
+    John Morris <john.morris@spirentcom.com>
+    Claus Gindhart <claus.gindhart@kontron.com>
+
+Description
+-----------
+
+This driver implements support for the Maxim 6650/6651
+
+The 2 devices are very similar, but the Maxim 6550 has a reduced feature
+set, e.g. only one fan-input, instead of 4 for the 6651.
+
+The driver is not able to distinguish between the 2 devices.
+
+The driver provides the following sensor accesses in sysfs:
+
+fan1_input      ro      fan tachometer speed in RPM
+fan2_input      ro      "
+fan3_input      ro      "
+fan4_input      ro      "
+fan1_target     rw      desired fan speed in RPM (closed loop mode only)
+pwm1_enable     rw      regulator mode, 0=full on, 1=open loop, 2=closed loop
+pwm1            rw      relative speed (0-255), 255=max. speed.
+                        Used in open loop mode only.
+fan1_div        rw      sets the speed range the inputs can handle. Legal
+                        values are 1, 2, 4, and 8. Use lower values for
+                        faster fans.
+
+Module parameters
+-----------------
+
+If your board has a BIOS that initializes the MAX6650/6651 correctly, you can
+simply load your module without parameters. It won't touch the configuration
+registers then. If your board BIOS doesn't initialize the chip, or you want
+different settings, you can set the following parameters:
+
+voltage_12V: 5=5V fan, 12=12V fan, 0=don't change
+prescaler: Possible values are 1,2,4,8,16, or 0 for don't change
+clock: The clock frequency in Hz of the chip the driver should assume [254000]
+
+Please have a look at the MAX6650/6651 data sheet and make sure that you fully
+understand the meaning of these parameters before you attempt to change them.
+