diff options
| author | Hans-Juergen Koch <hjk@linutronix.de> | 2007-05-08 17:22:00 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@hyperion.delvare> | 2007-05-08 17:22:00 +0200 |
| commit | d20620de0c3de622a9d6a841725bafaed6d1aec2 (patch) | |
| tree | 5dbd1f0f04b44c0af6711b28a4fccc41b8bdaace /Documentation/hwmon/max6650 | |
| parent | e84cfbcbe830c20af030fd7ba37edf8ed88fda5f (diff) | |
hwmon: New max6650 driver
This driver supports the Maxim MAX6650 and MAX6651 fan speed
monitoring and control chips.
Signed-off-by: Hans J. Koch <hjk@linutronix.de>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'Documentation/hwmon/max6650')
| -rw-r--r-- | Documentation/hwmon/max6650 | 53 |
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. + |