Messages in this thread | | | Date | Thu, 02 Sep 2004 20:33:10 +0000 | From | John Lenz <> | Subject | [PATCH 2.6.8.1 0/2] leds: new class for led devices |
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This is an attempt to provide an alternative to the current arm specific led interface. This arm interface does not integrate well with the device model and sysfs.
We create a new class that drivers can register a leds_properties structure with. Each led that is registered is assigned a number, and three attributes are exported to sysfs in /sys/class/leds/1/, /sys/ class/leds/2, etc.
color : a read only string attribute that shows the available colors of this led. If it is a multi-color led, then the colors are seperated by a "/" (for example "green/blue").
function : a read/write attribute that sets the current function of this led. The available options are
timer : the led blinks on and off on a timer idle : the led turns off when the system is idle and on when not idle power : the led represents the current power state user : the led is controlled by user space
light : a read/write attribute that allows userspace to see the current status of the led. If function="user" then writing to this attribute will change the led on or off. If function != "user" then writing has no effect. light is an integer, where 0 means off, 1 means on first color, 2 means on second color, etc. (for example, if color="green/blue" then light=1 means turn led on to green and if light=2 means turn led on to blue.
A device and driver symlink point to the actual driver and such, so any extra attributes can also be registered.
Signed-off-by: John Lenz <lenz@cs.wisc.edu>
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