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Diffstat (limited to 'Documentation/leds/uleds.txt')
| -rw-r--r-- | Documentation/leds/uleds.txt | 36 |
1 files changed, 0 insertions, 36 deletions
diff --git a/Documentation/leds/uleds.txt b/Documentation/leds/uleds.txt deleted file mode 100644 index 13e375a580f9..000000000000 --- a/Documentation/leds/uleds.txt +++ /dev/null @@ -1,36 +0,0 @@ -Userspace LEDs -============== - -The uleds driver supports userspace LEDs. This can be useful for testing -triggers and can also be used to implement virtual LEDs. - - -Usage -===== - -When the driver is loaded, a character device is created at /dev/uleds. To -create a new LED class device, open /dev/uleds and write a uleds_user_dev -structure to it (found in kernel public header file linux/uleds.h). - - #define LED_MAX_NAME_SIZE 64 - - struct uleds_user_dev { - char name[LED_MAX_NAME_SIZE]; - }; - -A new LED class device will be created with the name given. The name can be -any valid sysfs device node name, but consider using the LED class naming -convention of "devicename:color:function". - -The current brightness is found by reading a single byte from the character -device. Values are unsigned: 0 to 255. Reading will block until the brightness -changes. The device node can also be polled to notify when the brightness value -changes. - -The LED class device will be removed when the open file handle to /dev/uleds -is closed. - -Multiple LED class devices are created by opening additional file handles to -/dev/uleds. - -See tools/leds/uledmon.c for an example userspace program. |